Best Practices for a Broomed Concrete Finish
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Zero Turn for Mobility
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December 2019 | Issue 7, Volume 19
WHAT’S INSIDE Cover Photo Credit: SUNDEK
Departments 4 Editor’s Letter 6 Pre-World of Concrete Products 66 The Last Placement
What’s Online 5 Things Not to Do Before a Recession
Cover Story 26 The Lumen Project Addressing the unique challeges of applying a decorative concrete treatment in a high-rise condiminium.
38 A Model of Sustainable Design
Features 10 Placing Total Concrete Slab Packages The current practices for installation from base course to final finish.
18 How to Avoid Broomed Concrete Finish Disputes Best practices can protect contractors and minimize costly disputes.
32 Plastic Formwork Key to Cold Weather Pour A New Jersey contractor partners with Fab-Form to place the foundation and footings for a Rutger University project in frigid temps.
36 Bridge Overhang System Solves Wekiva Parkway Challenges The modular system design solved the challenges of a Florida bridge project.
The Confluence Park Project looked to nature for inspiration, using custom pavers and concrete “petals” to form pavillions.
44 Innovations in Concrete Attachments
Contractors should start preparing at least a year in advance to keep the impact of a recession on their buinesses to a minimum. Search: 21102684
Bekaert Shares Advantages of Fiber Reinforced Concrete Tim Lussier of Bekaert Corp. discusses fiber reinforced concrete and how it offers contractors savings in both labor and materials. Search: 21028712
The newest tools for cutting and crushing, hammering and drilling, and mixing and scooping.
46 4 Questions to Ask When Considering Propane Equipment Can your jobsites benefit from propane’s cost and emissions advantages?
50 Closing the Maintenance Gap Between Contractor and Custodian Maintenance of polished concrete floors is all about communication.
54 Polishing Restores Luster to Vintage Motorcycle Museum A collaborative effort brought new life to a museum’s floor after decades of heavy traffic.
48 Equipment Specification Guides: Dust Collection A compilation of technical information when choosing a dust collection system.
www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor 3
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EDITOR’S LETTER Published by AC Business Media
New Decade, Same Challenges
T
Advisory Board
www.ForConstructionPros.com/Concrete PUBLICATION STAFF
Associate Editor Contributing Writers
he labor conversation sometimes feels a bit like we are beating a dead horse, but there’s no getting around it—the workforce shortage is and will continue to be one of the top challenges plaguing the construction industry in 2020 and beyond. As of April 2019, there were 434,000 vacant construction jobs in the United States, according to the U.S. Labor Bureau. And this gap will only continue to grow if left unaddressed. Without the needed skilled labor to complete the work, contractors are faced with missed deadlines and an inability to take on new and bigger projects—and as a result, uncontained costs and a loss of profitability. So, what can they do about it? A report by Trimble suggests that technology, especially mobile, could be the answer. The younger generations entering the workforce are increasingly influenced by technology not only in their personal lives but on the job. In fact, the report found that 98% of Gen Z (ages 0-21 years old) own a smartphone, and more than 50% say it’s their most important internet device. Put simply, for many millennials (22-37 years old) and Gen Z, working wirelessly is all they know.
Facebook.com/ ConcreteContractor
201 N. Main Street, Fort Atkinson, WI 53538 (800) 538-5544 • www.ACBusinessMedia.com
Amy Wunderlin, Associate Editor AWunderlin@ ACBusinessMedia.com
Unfortunately, the report found that this group sees the construction industry as a paper-based one. There is also a perception that the job of a contractor revolves around machines, physical labor and simple tasks—something they are not interested in. According to the USG Corporation + U.S. Chamber of Commerce Commercial Q1 2019 Construction Index, the top answers to inquiries about the biggest myths regarding working in the commercial building industry are that construction jobs are all “dirty” jobs (61%), construction work requires only brute strength (55%) and construction is just a “job” rather than a career (52%). While you and I know this to be untrue, the industry must continue to work toward changing this perception—and fast. Putting technology at the forefront is an important first step to attracting and retaining younger talent.
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Kim Basham KB Engineering Cheyenne, Wyo.
Jim Cuviello Cuviello Concrete Polished|Stained|Crafted Stevensville, Md.
Jim Baty Concrete Foundations Association Mt. Vernon, Iowa
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Senior Production Manager Art Director Audience Development Director Audience Development Manager
Amy Wunderlin, (800) 538-5544, ext. 1267 awunderlin@ACBusinessMedia.com Kim Basham, Jim Baty, Brad Humphrey, David C. Whitlock, Joe Nasvik, Chad White Cindy Rusch April Van Etten Wendy Chady Angela Franks
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CHANGE OF ADDRESS & SUBSCRIPTIONS
PO Box 3605, Northbrook, IL 60065-3605, Phone: (877) 201-3915 Fax: (847) 291-4816 • circ.ConcreteContractor@omeda.com REPRINTS Sean Dunphy, (800) 538-5544 , sdunphy@ACBusinessMedia.com LIST RENTAL Jeff Moriarty, SVP, Business & Media Solutions Infogroup, Phone: (518) 339-4511 Email: jeff.moriarty@infogroup.com AC BUSINESS MEDIA
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Published and copyrighted 2019 by AC Business Media. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording or any information storage or retrieval system, without written permission from the publisher. CONCRETE CONTRACTOR (USPS 021-799, ISSN 1935-1887 (print); ISSN 2471-2302 (online) is published 7 times a year: January, February/March, April/May, June/July, August/September, October/November and December by AC Business Media, 201 N. Main Street, Fort Atkinson, WI 53538. Printed in the U.S.A. Periodicals postage paid at Fort Atkinson, WI, and additional entry offices. POSTMASTER: Send address changes to Concrete Contractor, PO Box 3605 Northbrook, IL 60065-3605 October/November 2019, Issue 6, Volume 18
Search: Concrete Polishing
Dennis Purinton Purinton Builders, Inc. East Granby, Conn. Craig Coppersmith, P.E. Nox-Crete Omaha, Neb.
One year subscription to non-qualified individuals: U.S. 1 year: $35, 2 years: $70. Canada & Mexico 1 year: $60, 2 years: $105. All other countries 1 year: $85, 2 years: $160 (payable in U.S. funds drawn on U.S. banks). Single copies available (prepaid only) $10.00 each (U.S., Canada & Mexico), $15.00 each (International). Canada Post PM40612608. Return Undeliverable Canadian Addresses to: Concrete Contractor, PO Box 25542, London, ON N6C 6B2. Printed in the U.S.A. Concrete Contractor is the Official Media Sponsor of the CFA Foundation Company Certification Program
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4 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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The lightest in its class, the new Cummins X12™ engine is revolutionizing the concrete industry. The X12 doesn’t just set new performance standards of medium-bore engines – it sets new performance standards for your business. Tipping the scale at just 2,050 pounds, the productivity champion leads the industry in power-to-weight with up to 500 hp and 1700 lb-ft of peak torque. Backed by the largest support network, the X12 delivers power and a bigger payload to keep you moving forward in a world that’s Always On. Move your business forward at www.cumminsengines.com.
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PRODUCTS
World of Concrete
PREVIEW
Slated Feb. 4-7 in Las Vegas, the event features indoor and outdoor exhibits from leading commerical concrete and masonry construction suppliers. The following is a compilation of select products from scheduled exhibitors. Find more featured products and exclusive show coverage at ForConstructionPros.com/Concrete. Vacuworx SL 2 Subcompact Vacuum Lifting System
The next-generation SL 2 Subcompact Vacuum Lifting System is now available with a standard 24 in. x 24 in. pad or 12 in. x 36 in. pad for handling more narrow trench cuts. Other sizes are available upon request. • Base unit and pad weigh approximately 100 lbs. • Can be used on carriers with or without a case drain • Maintains a lifting capacity up to 2,700 lbs. • Features quick-connect hydraulic hoses and a factory preset flow control valve • Requires a minimum 10 gpm with a maximum of 3,000 psi • Manual or wireless remote control ForConstructionPros.com/12217057 World of Concrete 2020 Booth #O31635
C555 Concrete Moisture Meter
Wagner Meters’ handheld electronic C555 Concrete Moisture Meter is designed for comparative measurement of concrete and other surfaces. • ASTM F2659 compliant • Onboard ambient temperature and relative humidity sensor • “Relative Measurement” mode for comparative measurement of other smooth surface materials such as brick or cement block • “On-Demand Calibrator” platform to perform fast and easy calibration to factory settings while in the field • Abrasion-resistant Teflon sensor surface • Protective rubber boot • Works in conjunction with Rapid RH L6 system ForConstructionPros.com/21091244 World of Concrete 2020 Booth #S12555
BackSaver Hammer Drill Attachment
The BackSaver Hammer Drill Attachment allows the user to stand to help prevent injury. • Drills dowel bars more easily • Enables user to apply more pressure and use less energy • Attaches to two models of DeWalt hammer drills ForConstructionPros.com/10303330 World of Concrete 2020 Booth #N3050
SEARCH for more information online using the unique URL under each product.
Alu unm and elev
>>
6 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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New com pow
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A ONE-OF-A-KIND LIGHTWEIGHT DRIVE-IN SCREED
• Upper Deck • Residential • Slab-On-Grade • 3D Surfaces
New from Ligchine, the SpiderScreed™ addresses the common issues of drive-in screeds such as weight, power, navigation, and leveling capabilities.
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Aluminum frames, high speed electric actuators, unmatched navigation with the Versa-Drive™ system, and Ligchine’s patented machine leveling system elevate the SpiderScreed™ into a class of its own.
>> See more at www.ligchine.com sales@ligchine.com | 812-903-4500
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PRODUCTS
QUIKRETE FASTSet Stucco Patch
Ligchine SpiderScreed Addresses DriveIn Weight, Power, Navigation and Leveling Concerns
The SpiderScreed addresses the issues of drive-in screeds such as weight, power, navigation and leveling capabilities. The SpiderScreed is ideal for concrete placements on upper decks, residential applications, slab-on-grade and 3D surfaces. A tubular aluminum main and screed head frame makes the SpiderScreed the lightest drive-in screed featuring an auger screed head or a smooth roller for multidirectional use. High speed electric actuators drive Ligchine’s patented machine leveling system that produces superior FF/FL numbers. Ligchine’s Versa-Drive system allows for unmatched machine movement, screeding control and speed. Other features include: • Leveling Systems: - Laser: Two Topcon LS-B110 receivers - Tracker: Two Topcon ST-2 Sonic Trackers (optional) - LPS: Topcon robotic total station control (optional) • Independent hydraulic front wheel drive system. Wheels are linked together in unison achieving zero turn, parallel and lateral steering and drive motions • Includes an Eaton keypad for operator controls and a Parker MD4 7-in. touch-screen display for systems/ diagnostic status • Weighs 1,280 lbs./581 kg. • Width—94 in./239 cm • Length—69 in./175 cm • Height (to lift lugs): - Extended: 70 in./178 cm - Retracted: 59 in./150 cm • Powered by a Honda GX630—20.8 HP/15.5 kW • Screed Head: - 10 ft./3.1. m - 8 ft./2.4 m (optional) ForConstructionPros.com/21083055 World of Concrete 2020 Booth #S11447
Stucco accounts for about 20 percent of the current residential siding market, and while the material is durable, it will inevitably require maintenance. QUIKRETE, a manufacturer of pre-blended commercialgrade cement and concrete products, has made stucco repair easier, faster and more effective with its new QUIKRETE FastSet Stucco Patch. • Designed for full-depth and thin repairs, QUIKRETE FastSet Stucco Patch is a portland cement-based material formulated to restore damaged stucco surfaces • QUIKRETE FastSet Stucco Patch can be textured to match the surrounding stucco profile and can be painted in 90 minutes • Applied with a trowel or putty knife, a 20-lb. pail of QUIKRETE FastSet Stucco Patch will repair about 10 sq. ft. at ¼-in. thick. QUIKRETE FastSet Stucco Patch is shrinkage compensated to prevent cracks in larger repairs ForConstructionPros.com/21060075 World of Concrete 2020 Booth #C3152
TennaMINI Cellular GPS Tracking Device
Ideal for tracking the position of your heavy and mid-sized equipment and machines, the TennaMINI trackers provide precise GPS tracking and management for your valuable assets. • Ultra compact (1.25 in. x 2.25 in. x 5 in.) • Available in both a solar-rechargeable and long-life battery models • Durable, configurable, easy-to-install and long-lasting for reliable fleet tracking and management • Captures location data across cellular networks directly to Tenna for asset location updates • Multiple operating modes allowing for a stationary ping rate as well as motion-based ping rates • Delivers insights on where your assets are on the map and where they have been • Built-in cellular and GPS antenna ForConstructionPros.com/21092162 World of Concrete 2020 Booth #N1271
Minnich 50 CC Gas-powered Backpack Concrete Vibrator The new 50 cc gas-powered back pack concrete vibrator is a powerful, lightweight and ergonomic back pack. The 20.5-lb. vibrator unit is designed to maximize operator comfort, mobility and productivity during concrete consolidation. Driven by a Honda 50 cc motor for reliable performance, the back pack is equipped with many new features, including:
• A removable throttle assembly that enables operators to relocate the throttle for easy and comfortable operation • Interchangeable core/casings and vibrator heads between all Minnich gas-powered and electric shaft units ForConstructionPros.com/21102526 World of Concrete 2020 Booth #C4213
8 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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Beast Form Stake
Part of Stego Industries' vapor barrier-safe forming system, the Beast Form Stake takes the place of old-style screed pad posts for interior forming applications. • Meets ASTME1643 • SpeedTrack Fastening Grooves allow you to place a screw or a nail anywhere along the length of the Form Stake • Durable and reusable • Composed of 100 percent virgin ABS • Length: 18 in. • Diameter: 3/4 in. ForConstructionPros.com/21086744 World of Concrete 2020 Booth #S12545
Mondo Poly Brush from Wagman Metal Products
Wagman Metal Products Inc., a manufacturer of power trowel replacement blades, pans and innovative trowel attachments for scrubbing, stripping and polishing, introduces a new Polypropylene brush—the Mondo Poly Brush. • The stiff polypropylene bristle is good for general scrubbing on smooth concrete including cleaning floors after tilt-up construction and applying densifiers • The brush will not rust and is resistant to many chemicals • The Mondo Poly brush can be used on 36 in. and 46 in. walk-behind as well as 6 ft. and 8 ft. ride-on power trowels • The 11 in. size can be used on the Wagman LP230 ForConstructionPros.com/20994118 World of Concrete 2020 Booth #S10448
www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor 9
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FLATWORK/SLABS
By Chad S. White, Bob Simonelli
Placing, Finishing, Sawing and Curing Total Concrete Slab Packages The following is the second article in a two-part series that reviews current practices for installation of total concrete slab packages from base course to final finish.
P
art one of this series focused on slab preparation and subbase installation. In the article, we learned the importance of a well compacted and smooth subgrade, as well the proper installation of formwork, jointing, vapor barriers and other reinforcement. This article will discuss the next steps to placing, finishing, sawing and curing medium to large concrete slab on grade.
PRE-PLANNING AND SCHEDULING SLAB PLACEMENT Rate of placement and screeding method are baseline decisions that must be made prior to start of placement. Placing/finishing concrete is time sensitive and susceptible to environmental conditions. Ideally you want to work within an 8- to 16-hour window for place, finish and cure/saw cutting operations.
Early entry sawing. Photo Credit: Chad White
Double screed strike-off. First screed, (out of picture) operating a raking pass and second screed strike-off. Photo Credit: Chad White
A 50,000 sq. ft. slab on grade placement. Photo Credit: Chad White
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FLATWORK/SLABS
Figure 4: Power rake/laser screed strike-off. Photo Credit: Chad White
Major considerations when scheduling concrete and planning day of placement activities include: • Interface of equipment during placing operations. Whether pumping, buggies or tailgating planning is required. Type of screed, placing method used and placement configuration will normally dictate placement path. Leading edge of concrete during placement should seldom exceed 150 ft. Pay close attention to how you are going to close out the placement. Every time you change direction of placement or screeding you lose time and levelness of slab. • Labor crew required and sequencing. Staggered shifts are recommended with the intent to ensure adequate personnel during
Roller tamp attachment to laser screed. Photo Credit: Chad White
the place/finish, saw and cure operations. • Environmental conditions and start times. Hot weather conditions will often require night time concrete placements. Off hours batch plant availability/low traffic will also dictate start time. • Impact of mix design on place/ finish means and methods. Place/ finish characteristics and set time is of primary concern. Ideally, you would like to see float pans in 3-4 hours and slab finish 6-8 hours from time of placement. Planning Tips • Consider pre-slab coordination meetings, both internally and externally. Build it conceptually before you place it. • Review submittals and specifications. Your placing foreman should know the mix design and plan details pertinent to placement.
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• Try to source all concrete from one batch plant if possible to minimize differential set times. If more than one batch plant must be used, try to maintain separate areas of placement for each plant instead of randomly placing trucks during placement. • Establish communication protocol for canceling or changing start times of placements. “Go, hold, no go.”
PLACING AND STRIKE-OFF OF CONCRETE SLABS For the purpose of this article we will be discussing concrete placement rates of 60-200 cu. yds. per hour and strike-off rates of 4,000–8,000 sq. ft. per hour. Formwork and strike-off will dictate the FL numbers. Uniformity of slump and rate of placement will greatly influence FF numbers and panning/finishing processes.
Alternate approach to consolidating/ sealing floor after strike-off and roller tamp. Photo Credit: Chad White
FF60/FL40 is the new norm for warehouse and open slab placements. Automated raking and screeding of slabs will result in higher production rates and flatter floors. Major considerations when placing concrete include: • Lighting. Most placements start early morning, and adequate lighting is critical. • Minimal disruptions to subgrade, vapor barriers, reinforcing and penetrations. • Truck routes and staging areas. It is in everyone’s best interest to get concrete to the site and off-loaded in a timely fashion. Every placement will require clear access to edge of placement and staging for testing/truck prep and wash-out.
The most efficient operations I have seen utilize a driver foreman to direct trucks and manage delivery of order. If not provided by the supplier this responsibility defaults to the placing foreman/designated flag man. Insist on participation by concrete supplier in your daily placements.
F
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FLATWORK/SLABS
• Managing slump. Strive to maintain a maximum 2-in. slump variation load to load throughout placement. I’ve always thought that 6-in. max slump is a good guideline for conventional slab mixes. Sometimes you must reject. • Consolidation at slab edges and penetrations. This enhances burnish uniformity and consolidation and is just good concrete construction practice. • Leading edge of concrete. How wide do you go? Manage uniformity of slump and placement area. You should tailor your placing methods to delivery rate, access and the screeding methods available. • Manage environmental factors, such as evaporation rate, direct sunlight and rain. Installation Tips • Check, check and recheck formwork and FF elevation during placement. • Insist that all trades with work affected are present during placement to monitor their work as concrete is placed. • Smooth delivery of concrete to point of placement is important. Try not to place concrete over 2 in. above FF elevation ahead of screed. Excess concrete at end of screed pass slows placement. • Use evaporation retarders correctly. They need to be applied after
V initial float pass and not worked into the surface as a finishing aid. This can become an issue when applied directly from laser screed head then floated in using channel float or check rod.
FINISHING SLABS FROM STRIKE-OFF TO FINAL BURNISH Finishing floors is all about flatness, burnish and attention to detail. Timing of finishing steps is a critical factor and must be judged in real time. Major considerations for finishing concrete slabs include: • Initial floating after strike-off. Standard practice is to follow laser screed strike-off with either check rod or channel float. Key issues are smoothness, seal and consolidation of aggregate. • Panning—bigger is better. Having experienced the revolution in power floating from float shoes on 36-in. walk behind trowels to 12-ft. panning machines, it is obvious that the bigger machines produce flatter floors. Use the largest pan machines that are practical for the placement. An 8-ft. pan machine can give you satisfactory FF numbers on most placements, Clean straight cuts. Photo Credit: Chad White
Blending edge burnish. Photo Credit: Chad White
and the move to larger pan machines should be based more on productivity requirements and efficiency. • Combination blades are the unsung hero of flat, blemish-free floors. Combination blades are recommended for the initial troweling of the slab surface due to their larger size and less downward pressure being applied versus a typical finish trowel blade. This is the first troweling of the slab and is the dominant factor affecting smoothness and number of holes or blemishes in the floor. • Trowel blades—plastic or steel? The trend is light, 8-ft. ride-on trowels equipped with plastic blades for final pass and finish. • Hand work. How much edge work and detail required? The proper use of edge troweling machines will save labor and improve the overall finish. Tips for Finishing • Edge machines, finishing slicks and plastic blades work. • Reducing footprints in slab surface during finishing will improve cosmetics. • Long trowel machine passes minimize turning machines. Always
14 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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FLATWORK/SLABS
Installing wet cure blankets. Photo Credit: Bob Simonelli
run as flat and as slow as conditions allow. • Board the edges. • Strive for uniformity in burnish edge-to-edge. • Limited or insufficient equipment resources is a poor excuse for an inadequate finish.
SAWING & CURING Curing is either spray-on membrane or wet cure with blankets. There are pros and cons to both systems, and individual project requirements may dictate the choice. The important thing with curing is timeliness and adherence to manufacturers and project specifications.
Timing is probably the key coordination factor with saw cutting operations. A skilled crew and good equipment are required. There is nothing worse than having a great looking finish marred by crooked or spalled cuts. Major considerations for installing control joints and curing include: • Control joint lay-out and reentrant corners. Every reentrant corner is a potential crack. • Interface with floor flatness testing. Before or after? • Blade matched to local aggregate. Understand blade break-in protocol. • Dust control and disposal. • Water source for wet cure operations. • Understanding application rates for membrane cures and have
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qualified personnel to install. Tips for Sawing/Curing • Understand the joint lay-out at the field level. • Pay attention to the last 5 ft. of the saw cut and dropping the blade into an existing cut. • Dust control and disposal game plan is essential. • Spray equipment for membrane curing. Learn to do the maintenance and cleaning, or plan on replacing equipment regularly. • Wet curing operations are particularly hard to mesh into a general-trades work flow schedule due to limited access to slab area during curing process for personnel.
SLAB PROTECTION AND HOUSEKEEPING Control and conditions of access during the placing/curing period is probably the biggest component to a
slab protection plan and the hardest to police. Ensure a slab protection plan is communicated to all trades. Advocate for daily cleaning by floor scrubber during construction. Ensuring that a spill kit is available while the slab is being used by other trades is a must and a major component of daily housekeeping. Scratches, gouges, spills and edge destruction are major concerns when slab is being used as a work platform by general trades. Major considerations for slab protection include: • Jobsite posting of a slab protection plan and adherence to it. • Entry and exit points for other trades access, equipment and personnel defined and managed. Slab edge protection primary consideration. Execution Tips • Pick your projects wisely. Owners and general contractors that
understand slab protection are much easier to work with. • End of shift clean-ups per trade are strongly advised. • Plenty of dumpster space and trash bins. Chad White, founder of WL Concrete, has been involved in all aspects of concrete construction from craftsman to concrete subcontractor. He is the author of numerous articles regarding concrete slab on grade installation and a speaker at World of Concrete.
References:
1. ACI 302-1R-15: Guide for Concrete Floor and Slab Construction 2. ACI 302-2R-06: Guide for Concrete Slabs that Receive Moisture-Sensitive Flooring Materials 3. ASTM E1745-11: Standard Specification for Plastic Water Vapor Retarders used in Contact with Soil or Granular Fill under Concrete Slabs 4. ASTM E1643-11: Standard Practice for Selection, Design, Installation and Inspection of Water Vapor Retarders used in Contact with Earth or Granular Fill under Concrete Slabs
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FLATWORK/SLABS
By Kim Basham, PhD PE FACI
How to Avoid Broomed Concrete Finish Disputes Best practices can protect contractors and minimize disputes between job owners and architects.
B
room finishes, the most common surface textures for exterior flatwork, are created by pulling a broom over freshly placed concrete. Brooming creates a textured or slip-resistant surface with grooves typically installed crosswise (perpendicular) to the direction of travel. Brooming is performed after floating or troweling and is required for parking slabs and
exterior surfaces including slabs, ramps, walkways, driveways, steps and other flatwork requiring a nonslip surface. [1] In general, there are three broomed finishing categories or more specifically groove depths defined by the American Concrete Institute (ACI) [2]: • Fine-broomed finish—less than 1/32 in. in depth and created with a soft or horsehair bristle concrete finishing broom. • Medium-broomed finish—1/32 to 3/64 in. in depth and created with a horsehair or synthetic bristle concrete finishing broom. • Heavy-broomed finish—3/64 to 1/8 in. in depth and created with a stiff-bristled concrete broom. While ACI 310R-13 Guide to Decorative Concrete provides the
Handleless rope brushes work well on large slabs and in confined areas where handles are awkward. Photo Credit: Marion Brush Manufacturing Co.
groove depths for fine-, medium- and heavy-broomed finishes, ACI 310R is not a specification and does not provide a means to measure broomed groove depths. Therefore, job owner and architect specifications often vary and can lead to costly disputes. A few general best practices can help contractors avoid these disputes and keep projects on track.
THE BASICS OF CONCRETE BROOMS Concrete brooms are finishing tools specially designed to install textures to freshly placed flatwork. Common broom widths are 1 1/2, 2, 4, 6 and
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8 ft. Brooms are available with and without long handles. A handle-less concrete finishing system (rope brush) is pulled from side to side with ropes instead of being pulled across the surface with a long handle. Broom bristles typically consist of horsehair or synthetics or blends of horsehair and synthetics to create extrasoft, soft, medium and stiff bristles for installing fine, medium and heavy broom textures. The stiffer the bristles, the deeper the grooves. Marion Brush Manufacturing Co., which specializes in the manufacturing of concrete finishing equipment, tools and supplies, offers five different textures made from a few key ingredients, which include: • A smooth, “mendable” resin bristle, which when deformed, Jeff McCaughey, president of Marion
Brush Manufacturing Co., says can be brought back to shape simply with boiling water. • A custom-made resilient brush block that holds up to harsh conditions. • A high-quality aluminum extrusion backing that McCaughey says allows the finisher to swap out the bristles with up to five different texture refills. “These options allow the crew to determine which brush stiffness will best achieve the desired texture,” explains McCaughey. Because of many varying conditions on the slab, McCaughey adds that it is beneficial “to have the ability to swap out textures in order to compensate for unpredictable factors such as changing temps and weather conditions, random shaded areas, or differences in concrete mix itself.”
Marion's handleless concrete finishing system is pulled from side to side with ropes eliminating excessive handle weight. Photo Credit: Marion Brush Manufacturing Co.
Some manufacturers color code the bristles according to stiffness so it is easy to select the correct broom for the job. For example, each of Marion Brush’s five textures can be identified by a different color: White Super Soft, Black Soft, Orange Medium, Green Stiff and Red Rough Texture (a stiffness mostly for parking garages, bridge decks, hog lots, etc.) Groove depths also are a function of timing or how hard the surface is when broomed and downward pressure is placed on the broom. Brooming too early can create deep grooves and an irregular and rough surface; whereas, brooming too late may create very shallow grooves.
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FLATWORK/SLABS
BROOMING BEST PRACTICES Before brooming, check the surface to determine if the concrete is ready. Use the “finger test” to determine the hardness or readiness of the surface. The finger test consists of pressing a finger on the surface and evaluating the finger imprint depth and surface hardness. Weather and setting characteristics of the concrete are important factors that control concrete stiffening and the proper time to start brooming. If you start too soon, stop, refloat or retrowel the surface and wait until it has hardened more before retrying. While waiting for the surface to sufficiently harden, protect the surface from rapid moisture loss, especially during windy conditions. Otherwise, plastic shrinkage cracking may occur, and the surface may dry out making it more difficult to achieve an acceptable broom finish. When the concrete is ready, start by dampening the broom and gently place it on the opposite or far edge of the surface. “Because bristles absorb some moisture, we have always recommended that finishers initially moisten the bristles with water prior to the first pass,” says
The adjustable push-pull angled design on Marion's Chamelon Single brush uses the sides of the bristle not the ends to produce a superior brush finish. Photo Credit: Marion Brush Manufacturing Co.
McCaughey. “This lubricates the bristles and prepares them for a good initial pass.” Next, pull the broom toward you using a steady speed while maintaining the brush angle to the surface. When the broom is close to the near edge, lift it up and return to the far edge. Let the next pass slightly overlap the previous pass. Always pull the broom; never push it. Pulling ensures more of the broom face or bristles comes into contact with the surface and gives the finisher better control of the broom. For fiber-reinforced concrete, keep the broom at a small angle to the surface to minimize excessive fiber exposure and pullouts. Before each pull, the broom should be dampened but not too wet. If excessively wet or dripping water, brooming can cause surface discolorations, especially with colored concrete. Also, do not wet the concrete prior to brooming because added water can cause
discolorations and weaken the surface so it is more susceptible to wear and winter surface scaling. Also, do not broom with bleed water on the surface. If necessary, remove bleed water with a water or compressor hose. For a more uniform surface appearance, the bristles should be kept clean or free of excessive paste/mortar buildup. After each pull, either shake or wipe a gloved hand along the bristles to knock-off paste/mortar buildup. Bristles can also be frequently rinsed to keep them clean. McCaughey echoes this advice. He recommends agitating the bristle once each pass is complete and the brush is off the slab by running a gloved hand down the length of the brush to remove excess concrete debris. “This will help to keep all finishing passes more uniform and will decrease the amount of needless rouge debris on the slab,” he adds. Fresh concrete properties, including slump and setting characteristics, vary from one truckload of concrete to another. Exercise caution when brooming where two truckloads of concrete meet; otherwise, groove depths and broom texture may differ.
FINAL APPEARANCE MAY VARY Photo Credit: Marion Brush Manufacturing Co.
Concrete groove depths, broom texture and appearance will vary
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FLATWORK/SLABS
depending on batch variations between truckloads of concrete and different and changing weather conditions, including wind, sun, relative humidity and solar intensity (cloudy or sunny), which affect the setting and hardening characteristics of the concrete. Groove depths vary due to bristle type and downward pressure of broom, wetness
of the broom and timing. Even the time of day or the position of the sun affects the appearance of a broomed surface due to changes in light refraction, especially integral colored concrete. Additionally, the appearance of broomed surfaces will change with time, especially from the initial
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appearance as surface wear occurs due to both construction and service traffic. For these reasons, the appearance of broomed surfaces will not be uniform but will vary with groove depths and textures, color variations, surface wear and position of the sun when viewed.
SPECIFICATION PHRASES TO AVOID Because of the variations mentioned earlier, it is important to proceed with caution if your specifications contain phrases such as “coordinate required finish with architect,” “uniform, fineline texture,” “coarse transverse scored texture,” or “consistent appearance.” The following phrases are also typical broom finish specifications that can lead to disputes: Immediately after float finishing, slightly roughen trafficked surface by brooming with fiber-bristle broom perpendicular to main traffic route. Coordinate required final finish with the architect before application. Medium-to-fine-texture broom finish: Draw a soft-bristle broom across floatfinished concrete surface, perpendicular to line of traffic, to provide a uniform, fineline texture. Medium-to-coarse-textured broom finish: Provide a coarse finish by striating float-finished concrete surface 1/16- to 1/8-in. deep with a stiff-bristled broom, perpendicular to line of traffic. Immediately after concrete has received a float finish, give the concrete surface a coarse transverse scored texture by drawing a broom or burlap belt across the surface. Broom concrete surface with a steel or fiber broom to produce corrugations between 1/16- and 1/8-in. deep. Broom perpendicular to nearest edge of pavement. Broom all areas of a panel in the same direction. Use the same type and manufacture of broom for all paved surfaces to provide a consistent appearance. These phrases do not describe measurable standards and are subject to different interpretation by various
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parties. The words “coordinate,” “uniform” and “consistent” are subjective and typically interpreted to mean “to the satisfaction of the architect.” [3] Unfortunately, these types of phrases are subjective, ambiguous and sometimes abused by the architect and owner to reject work or hold your retainage. For the phrase “striating floatfinished concrete surface 1/16- to 1/8in. deep,” it is uncommon to measure groove depths and no standard exists for measuring striation or groove depths of a broom finish. Therefore, even this phrase can be subjective and create disputes between different parties. These types of phrases make it difficult to decide what is being specified and how to bid the specified broom finish. When in doubt as to what the specifier wants, consider clarifying your bid and submit requests for information before placing concrete.
entire project after the work has been completed. Kim Basham is president of KB Engineering LLC, which provides engineering and scientific services to the concrete industry. Basham also teaches industry-related seminars and workshops. He can be reached at KBasham@KBEngLLC.com.
References
[1] ACI 301-16 Specifications for Structural Concrete, American Concrete Institute, www. concrete.org [2] ACI 310R-13 Guide to Decorative Concrete, American Concrete Institute, www. concrete.org [3] Suprenant, B. A. PhD, PE, FACI and Salzono, F., PE, “Specifying broomed exterior concrete surfaces,” Construction Specifier, March 2015, www.constructionspecifier.com
MOCKUPS MINIMIZE DISPUTES If properly done, mockups of broom finishes can help minimize costly disputes between contractors, owners and architects. Mockups should represent the actual broom finish achievable for the project and reflect the various variables that affect the final appearance of broomed surfaces. A broom finish installed on a 10 ft. x 10 ft. mockup will not, however, reflect the surface and appearance variations caused by batch to batch concrete variations and different and changing weather conditions. Nor will a mockup reflect the different brooming techniques required for a small-scale versus a large-scale concrete placement. Therefore, careful planning and execution is required to create a mockup that accurately represents what can be achieved during large-scale concrete placements. Also, submit each concrete placement for acceptance as soon as possible as the work progresses to avoid a finishing dispute for the @diteqcorporation
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COVER STORY
By Joe Nasvik
THE LUMEN PROJECT A The high-rise condominium features an 8,000-sq.-ft. handcarved, travertine finish customized to address the unique challenges of placing a decorative overlay in the air.
pplying a decorative concrete treatment in a high-rise building presents a unique set of challenges. While traditionally you may use concrete pavers in an outdoor space on the ground, these areas in multi-floor buildings are limited by weight and thickness. The owner of the 34-story Lumen high-rise condominium project, located at Tyson’s Corner in the Washington D.C. area, chose LandDesign,
a landscape architecture, civil engineering and planning firm, because of its experience in handling such challenges. LandDesign specializes in land planning, public open space and commercial work that includes mixed use high-rise buildings. In fact, Susan England, a senior associate with the firm, says the company frequently specifies decorative concrete for its projects and likes to work with “known quantities” when it comes to installing special finishes. There were two outside spaces on
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The Lumen high-rise condominium project used SUNDEK’s Sun Stone overlay patterning system to provide a decorative finish over the building's structural concrete. Outdoor common areas on the 7th and 32nd floors received the treatment. Photo Credit: SUNDECK
discussions about patterns and finishes. England says they specified SUNDEK for the job because they had worked on several other projects with the company in the past and had a high level of trust in terms of durability and look of the final product. After discussions about what was possible, the team developed a hand carved, travertine finish for the project using SUNDEK SunStone. SUNDEK was able to provide a complete “turnkey” solution to this creative use of the product.
SUNDEK GETS INVOLVED EARLY
the Lumen project—one located on the 7th and the other on the 32nd floors of the building for a total of 8,000 square feet—that required special treatment. England says they were limited by the thickness and weight of the finish for a decorative treatment. The use of traditional pavers on a concrete subbase would have been challenging, and they wanted a unique custom look. LandDesign brought in concrete coating manufacturer SUNDEK to help develop a solution. The project was still three years away from beginning construction, but they wanted to start
SUNDEK is one of the oldest and most respected decorative concrete companies in the industry. Founded in 1970 in southern California, the company has since added installers across the United States and globally. It is somewhat unique in this industry because it is a manufacturer of products with both corporate and independently owned installers. SUNDEK specializes in overlay type finishes ranging from sprayed to trowel applied systems—as thin as 1/16th of an in. and as much as 1/2-in. in thickness. Its products work well for both restoration and new applications. Bob Miller, vice president and general manager for SUNDEK of Washington D.C., says architects are creative and like the ability to achieve many different looks. SUNDEK products provide that flexiblity so architects can visualize a design.
Miller says they work hard to build strong relationships with the design community and like to be brought in for discussions when a project is in the early design phase. In these meetings they share ideas about decorative finishes, make samples and provide cost estimates. The goal is to build trust and exceed expectations on the final product. “They tell me the look they desire, and we work to provide that look,” Miller adds.
THE LUMEN PROJECT On the Lumen project there were two outdoor spaces with cast-in-place structural concrete where the architect wanted decorative concrete. A mix of outdoor seating, outdoor kitchens, walking and vegetation was planned for the “amenities” area on the 7th floor. The 32nd floor included a decorative pool deck along with other outdoor lounge areas and a dog area. For this
After the application of the overlay, workers laid out the pattern and cut into the overlay with a diamond bit on an angle grinder. Photo Credit: SUNDECK
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COVER STORY
project the architect and owner selected a 1/2-in.-thick SunStone travertine limestone finish applied by handtrowel. Miller says SUNDEK's system mix is an architectural limestone coating with limestone aggregates, and the hardened finish looks and feels like actual stone. Working on a high-rise has different challenges compared to working on the ground. Miller says they had to pre-schedule crane and elevator time in order to get their equipment and materials to their work areas. They also had to work with numerous trades around
their schedules and still accommodate the tight timeline of the general contractor. Weather was a challenge, too, because their work was located in outside areas. In all it took six weeks to install all the areas. Miller says his company tends to be perfectionist in nature, and this job was entirely handcrafted, adding to the stress levels both he and the workers felt.
KEEPING THE OWNER ONBOARD Working in a collaborative manner with owners and designers is a very
SUNDEK's system mix is an architectural limestone coating with limestone aggregates, and the hardened finish looks and feels like actual stone. Photo Credit: SUNDECK
important part of SUNDEK's process. It begins with the initial discussions with a customer to learn exactly what they visualize. England says that these meetings also give specifiers an idea of the possibilities. Miller’s goal is to educate them on the systems and provide them with their desired look. SUNDEK provided
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COVER STORY
samples that experimented with color, pattern, finish and sealed appearance and then created a final mock-up panel to serve as the standard for the job. Miller says they require both the owner and the landscape architect to approve the final mock-up before the work begins. SUNDEK takes the added step of requiring owner sign-offs at key times during an installation. On this project workers cut the pattern into a small sample area of the hardened overlay work. Then they asked the owner and landscape architect to compare the work to the mock-up and approve. After the pattern was cut and stained to match the mock-up, the architect or owner was again asked for their approval—coloring can be modified at this point if needed. Miller says they continued to ask for additional approvals as the project moved forward. “We do this to ensure expectations are met throughout the process; if anything needs to be changed, we can pivot before it’s too late. This not only protects us but allows key stakeholders the ability to be involved during the project rather than at the end,” he adds. England says she doesn’t always get
the opportunity to review at each stage of an installation, but her firm wishes more contractors would follow this model.
A hand carved, travertine finish was chosen for the project using SUNDEK SunStone. Photo Credit: SUNDECK
THE SUNDEK PROCESS With any overlay project, surface preparation is very important, so the first step for SUNDEK workers was to search for any signs of delaminated concrete, cracks and “bird baths” and make the necessary repairs. Some types of cracks can’t be repaired, so owners must be informed that they may reflect through any decorative concrete overlay. But sometimes cracks can be incorporated into custom stone patterns. After these initial repairs SUNDEK diamond grinds the concrete to obtain a bondable, coarse, open surface that meets the International Concrete Repair Institute’s (ICRI) CSP 2 profile. The surface is then cleaned with a vacuum and pressure washer to remove all dust—using equipment meeting OSHA standards. When the SunStone was mixed, Miller’s crew placed it by hand-trowel checking it with a gage-rake for correct thickness. Once the overlay system hardens, the next step involves laying
out the pattern and using diamond etching equipment to cut it. The final color selection is a staining process, which they completed after the patterning was complete. A combination of multiple colors was used to obtain the landscape architects desired look. Safter one final color check by the landscape architect and owner, the top coat penetrating sealer was applied.
POSITIVE RESULTS England says the owner is extremely happy with the results. They have a unique look that met all the constraints of the job. They were also able to coordinate with the interior designers for the project to complement the indoor to outdoor appearances. LandDesign believes that SUNDEK provides a cost-effective, unique, highquality appearance. And for SUNDEK, the Lumen project was another step toward building on its longterm relationship with the landscape architect firm.
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FOUNDATION & WALLS
By Mackenna Moralez
This pad is about 30 in. deep and easily framed with a single 2x6 on top and a second 2x4 rail two-thirds of the distance between the top rail and the ground. Most of the lower concrete loads are taken by the friction between the fabric and the ground below. Photo Credit: Fab-Form
FABRIC FORMWORK Key to Cold Weather Pour
T
he winter season can bring on a series of challenges: snow, ice and severely low temperatures. These challenges are even more significant for concrete contractors who are often forced to shorten their construction season to avoid the problems associated with placing concrete in cold temps. However frigid temperatures didn’t stop Force Concrete and Masonry Corporation and Fab-Form Industries from forming the footings for
Rutgers University Health & Athletic Performance center. Cold weather is technically defined as a period when, for more than 3 consecutive days, the average daily air temperature is less than 40 degrees F, and the air temperature is not greater than 50 degrees F for more than half of any 24-hour period. Challenges first began when the jobsites’ ground was frozen even after excavation, prompting Force Concrete & Masonry to run warm water in an attempt to thaw it. That plan backfired, however, when the crew arrived the next day to ice that was up to 4-in. thick. The New Jersey contractor ended up renting a ground thaw machine, which runs hoses filled with anti-freeze and that are heated up in a boiler. “We spread it everywhere to make sure the ground stayed thawed because we can’t pour concrete on frozen ground,” explains Bill Pavlic of Force Concrete & Masonry. “Our schedule was so tight, we had no option but to rent the thaw machine.”
FASTFOOT KEEPS PROJECT ON TRACK
Force Concrete & Masonry first started working with Fab-Form and its Fastfoot product about 10 years ago, says Joey Fearn, sales manager for Fab-Form. “They’ve been tinkering around with the product and learning how to use it more Steps are easily accommodated with Fastfoot as shown in the photo below. The ground was so hard that the contractor drove electrical conduit into the ground and screwed the conduit to the screed board.
Photo Credit: Fab-Form
Force Concrete & Masonry partnered with Fab-Form to place the foundation and footings for Rutgers University Health & Athletic Performance Center in frigid winter temperatures.
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Photo Credit: Fab-Form
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FOUNDATION & WALLS
efficiently for the last decade,” he notes. The Fastfoot product, which is made of high-density polyethylene fabric, differs from traditional plywood not only from a sustainability standpoint, but also from a labor efficiency aspect. Fearn explains that workers using fabric don’t have to setup heavy plywood formwork, strip and clean them,
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and move them to the next jobsite. Fabric forms are left in place, relieving back pain and keeping the guys fresh. “They’re able to set up a lightweight skeleton with two by fours or two by sixes and then staple Fastfood ontop,” Fearn says. “The weight of the material is one hundred times less than traditional platforms, so the wear and
tear on the workers is eliminated. The lumber framework is also easier to strip because the concrete doesn’t touch it.” Force Concrete & Masonry had a limited amount of time—just six months—to complete the project. The company had to work six days a week for the allotted amount of time. In order to expedite the process, they relied on Fastfoot to reach their goal. “When you strip [the forms], you only remove the lumber framework,” Pavlic says. “The fabric conforms to the uneven ground, which makes it a lot easier. If you’re using regular forms, you have to go back and patch in the bottom or other spaces.”
The fabric can be used Fastfoot leaves the jobsite once and prevents concrete clean after the from touching the lumber pour has been completed. framework. It also prevents Concrete moisture from getting into cannot leak out of the bottom the footings. The lumber of the forms. framework can be reused Photo Credit: Fab-Form and easily stripped, also icnreasing productivity for the workers. Because Force Concrete & Masonry was able to setup huge amounts of formwork before the pour takes place, they were able to pour all the concrete in one day, keeping the project on track. T “Concrete is the only building material in the world that is a liquid and can adjust to the uneven ground. Then it becomes a solid for the life of the building,” Fearn says. “Every other material like steel or wool is rigid and cannot
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eaves obsite er the been leted. ncrete ak out ottom forms.
Credit: b-Form
Complex footing and pad layouts are easily accomodated with the lightweight framework lined with Fastfoot.
Photo Credit: Fab-Form
adjust, while concrete will just flow and form what it needs to. That’s why using a woven plastic is ideal because it is deformed by the concrete to conform to the ground below it.
BREAKING THE STIGMA While the benefits of using the woven plastic are two-fold, there are still challenges that surround it. Both Pavlic and Fearn agree that there is a stigma in the industry on using new materials, suggesting that contractors can be set in their ways. “We’ve been forming concrete for centuries using ridged forms. But using fabric is a paradigm shift for the industry,” Fearn says. “It is hard for some people to wrap their heads around, but Bill is an innovator that thinks outside the box and can see the benefits.” Resistance first starts when using woven plastic is brought into the conversation. Often people say no to using the product because they are unsure of how it can hold concrete. Pavlic explains that the weight of the concrete on the plastic helps support the bottom of the form, reducing by two thirds the lateral pressure on the bottom of the forms through the resistance of the fabric to the ground below. Meanwhile, in order to get the plastic to work well, you must be able to drive stakes into the ground. The company had to drill holes to hold the ledger tight. In addition, when using plastic it can be challengin to have forms higher than 3 ft. because it is difficult to control. Still, plastic is a growing trend in the industry. It is cheaper and can also save labor on the job—something that is crucial during the winter. “To my understanding, more people are starting to use plastic in New Jersey,” Pavlic says. “It used to be every time we used it, someone new would come to the jobsite and be shocked by the materials. That’s starting to go away, though. More and more people are using it, and we used to be the only one.”
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FOUNDATION & WALLS
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WEKIVA PARKWAY The system allowed the contractor to achieve a forming cycle that was three times faster than traditional handset systems.
L
ike many areas of the United States, Central Florida has seen increased traffic congestion. Current construction north of Orlando on the Wekiva Parkway will complete the beltway around the multitown area, relieving traffic on several surrounding highways. Recognized as a National Wild and Scenic River as well as a Florida Outstanding Waterway, the Wekiva River and its banks are known for its rich wildlife and picturesque views. Wekiva Parkway Section 6 near Sorrento, a 6-mile-long design-build project, represents a major portion of the Wekiva Parkway. This section is a joint project of the Florida Department of Transportation (FDOT) and the Central Florida Expressway Authority. Scheduled to open in 2021, it will connect state Road 429 in western Orange County and state Road 417. The result will be a tolled expressway loop around greater Orlando. A significant part of the parkway project is the bridge spanning over the
Wekiva River and surrounding banks. The bridge will raise the parkway 60 ft. above ground, creating an extensive corridor underneath it for the diverse wildlife; the corridor will connect the wildlife areas of Seminole State Forest, Rock Springs Run State Reserve and the Lower Wekiva River Preserve. The bridge will carry the tolled expressways, two single-lane service roads, as well as walking and bicycling paths. Timely completion of the bridge structures in this section is vital for the project to meet its demanding overall schedule and to relieve congested traffic in the area.
Doka's ParaTop Bridge Overhang formwork is a system that can be used for precast concrete and steel-composite bridges. Photo Credit: Doka
BRIDGE CONSTRUCTION
A major task when building bridges is the construction of the cast-in-place concrete traffic deck. In particular, the forming of the overhang areas and the support of heavy screed loads along the edges of the traffic deck can be a timeand labor-consuming task that requires increased attention to safety. Traditionally, bridge overhangs are supported and formed by hand with
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tightly spaced loose brackets and lumber anchored to the sides of the exterior bridge beams. For this project, assembly and disassembly by hand at the underside of the bridge deck would not meet the safety, schedule, access and cost requirements. The answer to these challenges was provided by using approximately 1,200 ft. of Doka’s innovative ParaTop Bridge Overhang system. ParaTop is a rentable, ganged bridge overhang system that is cycled from pour to pour via crane fork or boom lift, typically in 20-ft.-long by 8-ft.-wide units with installed guard rails. Due to its modular system concept, ParaTop can be adapted to different cross-sections, beam types, deck cantilevers and heavy screed loads. Even when supporting heavy load conditions, ParaTop can support large bracket spacing in the range of 6 to 10 ft., simplifying the work and drastically reducing the number of inserts, parts and pieces onsite. In addition, the modular system allows for the option to preassemble the gangs offsite in truckable units.
RELIABLY FASTER AND SAFER RESULTS ONSITE With the ganged ParaTop Bridge Overhang system, Floridabased contractor Superior Construction consistently achieved a forming cycle that was three times faster than traditional handset systems with the same crew size. A crew of five workers was able to strip, set and plumb, on average, 300 ft. of ParaTop Overhang Formwork in an 8-hour day. “The delivery of prebuilt ParaTop Gangs and the ease and speed of cycling the system helped the contractor meet milestones earlier and shave several weeks off the construction schedule,” says Martin Berger, director of Doka’s Infrastructure Division. “ParaTop brings safety, speed and efficiency to these fast-paced bridge projects.” The new bridge in Wekiva Parkway Section 6 is proceeding smoothly through the use of ParaTop. It is expected to open in 2021. The ParaTop system is cycled from pour to pour via crane fork or boom lift. Photo Credit: Doka
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DECORATIVE CONCRETE
By Amy Wunderlin
A Model of Sustainable
DESIGN
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The Confluence Park project looked to nature for inspiration, using custom pavers to represent the flow of two merging waterways and 29ft. concrete ‘petals’ to form pavilions.
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he Confluence Park project transformed a former storage lot into a stunning community gathering space. The San Antonio River Foundation challenged the designers to look to nature for inspiration, using paver patterns to represent the flow of the two merging waterways. Four different inlay patterns, including Cairo tiling, were used to create an intricate network of branches and curves. It is touted as a model of sustainable design and environmental education,
The centerpiece of the Confluence Park Project is the central pavilion made up of 22 concrete “petals” that arch together to form a network of vaults. Photo Credit: Keystone Hardscapes
taking inspiration from nature inspired materials. Winding paver walkways mimic the flow of water from the surrounding rivers, native plants frame paver walkways, while paver branches lead to the 29-ft. concrete petals that form into pavilions. The $12.8 million park’s elements also seek to highlight urban ecology and development, including 3.5 acres
River R $2.30 p
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DECORATIVE CONCRETE
The use of concrete played into the San Antonio River Foundation’s sustainability goals. The building material offers a resilient solution for the foundation’s goal of creating a 100-year structure. Photo Credit: Keystone Hardscapes
of native planting, a 2,000-sq.-ft. multi-purpose building, a 6,000-sq.-ft. central pavilion and three smaller satellite pavilions dispersed throughout the park. One of the more unique aspects of the project was the addition of custom pentagonal pavers. Keystone Hardscapes’ research and development team worked with the landscape architects to create a paver that would address both design and functional needs. Depth, width and angularity of the depressions on the paver’s surface ensured a minimalistic effect, while a micro-chamfer provided a clean edge. “The architect was looking for a
specific shape of paver, so we developed the pentagonal paver shape specifically for their project,” explains David Hasness, region engineer for Keystone Hardscapes.
“The architect had a vision that they wanted grooves on the paver’s surface. This park is at a confluence of a couple different rivers, so they thought it would be cool to have surface indents in the pavers that look like meandering rivers and streams,” he adds. Hasness worked with the landscape architect to decide how wide and deep the indents should be, as well as Keystone’s research and development team to accommodate the architect’s vision while keeping the manufacturing costs under control. “We were able to manufacture and supply the pavers for the job with minimal difficulties,” he notes.
INSTALLING CUSTOM PAVERS
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Custom pavers are not uncommon, but the amount of customization required on this job was more than normal. Often the shape of custom pavers is just slightly different from standard or maybe only the color is customized. The pavers used for the Confluence Park project, however, were not only a unique shape but they were much larger and heavier than standard pavers. “Typically, a custom paver is not different from anything else, but in this case the paver was very large,” says Hasness.
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This extra weight presented challenges when placing the paver down, especially if you needed to pick them up and realign. “Because they are so heavy, it made them difficult to maneuver,” says Hasness. The joints in between the pavers are also very small, which Hasness says made it more difficult than normal to sweep sand between them. According to the general contractor and project manager on the project, Wayne Ambrose of Spaw Glass, these challenges made for a slower installation and more labor, but overall it was a normal installation. The project took about 14 months to complete. “The only difference in installing the pavers was the requirement to line up the geometric patterns,” he says. “It’s a matter of orientating them. You can’t just lay them down; they all have to be aligned with each individual paver next to it.
“The most striking features of the park are the arching concrete pavilions that rise from the ground in the abstracted form of flower petals. These bold forms cluster together to provide pools of shade in the park, and by funneling rainwater into underground storage they are the most visible of the park’s interactive teaching tools,” says
the project’s landscape architect Bobby Eichholz of Rialto Studio. Each petal was cast on site using a modified tilt-up construction technique and digitally fabricated fiberglass composite molds and then lifted into place in pairs to form structural arches. Lifting the petals was the most challenging aspect of the job, says Ambrose,
GFRC
FOR
PROFIT
JANUARY 8-9
VERTICAL CONCRETE FOR
PROFIT
JANUARY 10-11 The pavilion’s concrete petals were cast on site using a modified tilt-up construction technique and digitally fabricated fiberglass composite molds. Photo Credit: Keystone Hardscapes
“It wasn’t extremely difficult, but it was little a bit out of the norm,” he adds.
CONCRETE PETALS FORM PAVILION The centerpiece of the Confluence Park project, however, is the central pavilion made up of 22 concrete “petals” that arch together to form a network of vaults.
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DECORATIVE CONCRETE
Keystone Hardscapes R&D team worked with the landscape architects to create a paver that would address both design and functional needs. Photo Credit: Keystone Hardscapes
because it was a nontraditional process. “There were challenges there because some pieces didn’t lift like we thought. We had to make some accommodations and adjustments there, but I consider that normal. You have to do that on every job,” he notes. This part of the project also required a lot of team collaboration. “Everybody has their own niche and expertise that they bring, and we were able to marry them all together and come up with a plan,” says Ambrose.
CONCRETE ENHANCES SUSTAINABILITY GOALS The park’s design was guided by the San Antonio River Foundation’s directive to create a park that engages and educates the community on native Texan ecological systems, river dynamics, watershed protection, and the importance of conserving natural resources. Key sustainability requirements included net zero energy and the elimination of stormwater runoff into the San Antonio River. This was achieved using a site-wide water catchment system, which takes advantage of the pavilions’ geometric design to collect rainwater and feed it into an underground water storage system. This reservoir is the sole source of water used in the park, except for sinks and drinking fountains. The use of concrete also played a role in achieving the project’s sustainability
goals, offering a resilient solution for the foundation’s 100-year building goal. By eliminating interior and exterior cladding, concrete as structure and finish also minimized the use of additional natural resources and adhesives. The multi-purpose building’s formwork was reused throughout each concrete pour. For the pavilion, rather than use traditional wooden formwork for the concrete petals, the team worked with fabrication to develop reusable fiberglass composite molds. Only three molds were needed for the project's concrete petals, and the robotically-milled EPS foam used in mold casting was recycled or repurposed by students at a local architecture school. In addition, the multi-purpose building’s green roof provides thermal mass for passive heating and cooling and a habitat for native grasses that will one day drape over the edges of the concrete walls and a solar photovoltaic array that is intended to produce 100% of the park’s energy needs. This low-lying building was designed as a dynamic juxtaposition to the pavilion—the board formed concrete walls are highly textured compared to the smooth, fiberglass-formed petals and the more geometric forms contrast with the curves of the pavilion. The park’s additional sustainable design and educational features include:
• A clear demonstration of five ecotypes in the South Texas region placed strategically to address the hydrology of each region relative to the hydrology of the site. • Pervious parking and other Low Impact Development strategies that, along with the landscape and building strategies, eliminate stormwater runoff into the San Antonio River. • A 130,000-gallon water catchment basin to provide the primary source of water throughout the park. “For years to come, Confluence Park will serve as an innovative and welcoming space for visitors to learn about natural river ecosystems. Confluence Park will also serve as a life-sized teaching tool that will inspire people to become more involved with the river, practice environmental stewardship and gain a greater understanding of Texas plant ecotypes,” Eicholz concludes.
Surface indents in the custom pentagonal pavers are meant to imitate meandering rivers and streams. Photo Credit: Keystone Hardscapes
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Finisher Specialty Commercial/Industrial Technician Strength Testing Technician Laboratory Testing Technician Aggregate Testing Technician Aggregate/Soils Base Technician Concrete Construction Construction Special Inspector Concrete Quality Technical Manager Concrete Transportation Special Inspector Tilt-Up Supervisor Tilt-Up Technician Shotcrete Nozzleman Shotcrete Nozzlemanin-Training Masonry Field Testing Technician Masonry Laboratory Testing Technician Adhesive Anchor Installer Field Testing Technician Flatwork Finisher Specialty Commercial/Industrial Finisher Specialty Commercial/Industrial Technician Strength Testing Technician Laboratory Testing Technician Aggregate Testing Technician Aggregate/Soils Base Technician Concrete Construction Special Inspector Field Testing Concrete Quality Technical Manager Concrete Transportation Special Inspector Tilt-Up Supervisor Tilt-Up Technician Shotcrete Nozzleman Shotcrete Nozzleman-in-Training Masonry ch Flatwork Finisher nician Masonry Laboratory Testing Technicia Adhesive Anchor Installer Field Testing Technician Flatwork Finisher Specialty Commercial/Industrial Finisher Specialty Commercial/Industrial Technician Strength Testing Technician Laboratory Testing Technician Aggregate Testing Technician Aggregate/Soils Base Technician Concrete Construction Special Inspector Base Technician Transportation Special Inspector Concrete Transportation Special Inspector Tilt-Up Supervisor Tilt-Up Technician Shotcrete Nozzleman Shotcrete Nozzleman-in-Training Masonry Field Testing Technician Masonry Laboratory Testing Technicia Adhesive Anchor Installer Field Testing Technician Flatwork isher Shotcrete her Commercial/Industrial Finisher Specialty Commercial/Industrial Technician Strength TesNozzlemanian Laboratory Testing Technician Aggregate Testing Technician Tilt-Up Soils Base Technician Concrete Construction Special Inspector Associate Concrete TransSupervisor Inspector Concrete Transportation Special Inspector Tilt-Up Supervisor Tilt-Up Technician Shotcrete Nozzleman Shotcrete Nozzleman-in-Training Masonry Field Testing Technician Masonry Laboratory Testing Technician FF vvv Adhesive Anchor Installer Field Testing Technician Flatwork ty Strength Specialty ialty Commercial/Industrial Finisher Specialty Commercial/Industrial Technician Strength Testing Technician Concrete Testing Technician Aggregate Testing Technician Aggregate/Soils Base Technician ete Construction Special Inspector Concrete Quality Technical Manager Concrete nician Special Special Inspector Tilt-Up Supervisor Tilt-Up Technician Shotcrete Nozzleman Field Testing otcrete Inspector an-in-Training Masonry Field Testing Technician Masonry Laboratory TTesting Technician Adhesive Anchor Installer Field Finisher Specialty With 26 Testing programsTechnician (and severalFlatwork more in development), the Commercial/Industrial American ConcreteTechnician Institute has Strength a certification program to Finisher Specialty Commercial/Industrial Testing Technician Laboratory Testing satisfy any number of concrete specialties that you’ve been l Tilt-Up Aggregate Testing Technician Aggregate/Soils Base Technician Concrete Construction about.Transportation Offering certifications around the worldConcrete Transportation Concrete Special Inspector ecial Technicianssociatethinking since 1980; learn how you can become ACI certified at Special Inspector Tilt-Up Supervisor Tilt-Up Technician Shotcrete Nozzleman ShotAdhesive Anchor www.concrete.org/certification. in-Training Masonry Field Testing Technician Masonry Laboratory Testing Technicia Installer Anchor Technician Flatwork echnician Flatwork Finisher Specialty Commercial/Industrial Finisher Specialty Aggregate Testingtrial Technician Strength Testing Technician Laboratory Testing TechnicianTechni Testing Technician Aggregate/Soils Base Technician Concrete Construction Special Inspector Concrete Quality Technical Manager Concrete Transportation Special Inspector Tilt-Up Supervisor Tilt-Up Technician Shotcrete Nozzleman Shotcrete Nozzleman-in-Training Masonry Field Testing Technician Masonry Laboratory Testing Technician Adhesive Anchor Installer Field Testing Technician Flatwork Finisher Specialty Commercial/Industrial Adhesive Anchor Installer Industrial cian Strength Testing Technician Laboratory Testing Technician Aggregate Testing Technician Con Aggregate/Soils Base Technician Concrete Construction Special Inspector Concrete Quality T Inspector Tilt-Up Supervisor Transportation Special Inspector Shotcrete Nozzleman-in-Training Shotcrete Nozzleman Tilt-Up Technician Shotcrete Nozzleman-in-Training Masonry Field Testing Technician Adhesive Anchor Installer Masonry Laboratory Testing Technician Field Testing Technician Flatwork
ACI CERTIFICATION PROGRAMS
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PRODUCT FOCUS
By Nathan Medcalf
Innovations in Concrete
ATTACHMENTS
The newest tools for cutting and crushing, hammering and drilling, and mixing and scooping boost uptime, productivity and safety. The Danuser Mega Mixer allows operators to mix, scoop and dispense a variety of materials, including bag-mix concrete. Some of the latest changes to the Mega Mixer include an 8-in. diameter and an 8-in. pitch steel auger for faster mixing and dispensing. Photo Credit: Danuser
CUTTING AND CRUSHING
C
oncrete is one of the most readily available, reliable and used construction materials. Original equipment manufacturers have been improving their concrete attachments in order to make concrete operations more efficient, safer and less costly. Since concrete is durable, the attachments used in concrete applications also need to be more durable, says Stuart Galloway, president of the Canadian Concrete Expo. Concrete can also be a messy activity. On the mixing end, wet concrete can gum up components. On the demolition end, small particles created through the demolition process can infiltrate attachments and cause damage. And, since construction and demolition can be risky worksites, efforts have been made to make the use of these attachments safer. Not only do many of these attachments improve on durability, uptime and safety, some include automation and versatility in order to improve concrete works.
Concrete is a material that lasts a long time, with many concrete structures often outliving their original use. "That is why so many attachments have been created for the destruction of concrete,” says Galloway. Concrete pulverizers easily crush through reinforced concrete and cut through light steel structures. The Nye XCP4 pulverizer is intended to be the heaviest and the strongest. “It is not a price point pulverizer; it is the best pulverizer on the market,” says Mark Nye, president of Nye Manufacturing. “This unit is intended for demolition.” One of the latest innovations of the Nye XCP4 is its unique and patented ripper shank located at the rear of the pulverizer. It is used for prying, ripping, flipping, sorting and manipulating. The profile on the unit’s teeth has evolved over many years of development to get the best performance. “It’s not just a dumb triangle,” says Nye. “We have pioneered many unique features on pulverizers, from our rebar pulling feature to our patented ripper. Our pulverizer is the
best. Experience makes it the best. The XCP4 represents our ninth generation of concrete pulverizers. We have been innovating for a long time.” Antraquip manufactures and distributes hydraulic rock drum cutters suitable for material with uni-axial compressive strength (UCS) ranging from 500 to 25,000 psi, which includes rock and concrete. The drum cutters feature a robust and customizable drum, powerful high torque hydraulic motors and robust cutting drums. The company manufactures both transverse drum cutters — which are well-suited for a variety of applications, including rock excavation, trenching, demolition, concrete, tunneling or underwater — and axial hydraulic drum cutters, which are mounted lengthways and designed for specialized application models such as narrow trenches, remediation, profiling, scaling and controlled demolition applications. Tramac manufactures one of the most versatile attachments appropriate for concrete applications. The Tramac MultiUtility Demolition Shears MT Series can easily be converted into different types
Epiroc pioneered the hydraulic breaker 50 years ago, and today their breakers feature automation for intelligent systems for simpler, more efficient and more economical breaker operation. Photo Credit: Epirco
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breaker force and stick force in line, the of jaws for a variety of applications. The company claims. Slip fit bushings are bottom half of the processor (shears) is easy to maintain and can be replaced replaceable. In about five minutes, it can in the field. be converted from a concrete cracker to Epiroc designed the first hydraulic a pulverizer jaw for crushing concrete, breaker 50 years ago. The Epiroc HB a steel shear for cutting I-beams, a tank heavy hydraulic breaker attachments are jaw that features two blades on one side well-suited for primary blast-free rock and one blade on the other, or a railways excavation and secondary rock breaking jaw that is specially designed for dealing with rail’s hard and brittle metal that is so on construction sites and in quarries, surface and underground mines, as difficult on jaws, says Shaun Brown, sales well as primary demolition of massive manager at Tramac. reinforced concrete structures. They feaThe latest innovations to the attachture the patented Intelligent Protection ment include the addition of a speed System (IPS), which seamlessly valve that make the jaws open and combines Epiroc’s AutoControl and close quicker for faster cycling times. StartSelect functions. The fully autoIt achieves this by taking outgoing oil mated system provides simpler, more and dumping it with incoming oil. efficient and more economical breaker It now is also equipped with a quick operation, Epiroc says. connect system instead Brokk says the TEI of pounding out pins for Rock Drills MMB326 is faster changeouts. With safer, more productive, this attachment, you can more accurate and quinot only demolish concrete eter than handheld tools structures but you can used in the same applicaseparate the rebar from the tion. The unit features an concrete. expanded hole range up to “Concrete with rebar in 3 in. in diameter and uses it is considered to be cona 360-degree positioner taminated,” says Brown. “If The Tramac Multi-Utility for drilling in a variety of you separate the rebar from Demolition Shears MT positions. The 30-in.-long the concrete, the concrete Series can easily be converted into different MMB326 delivers 200 can be used as a backfill, types of jaws for a ft.-lbs. of impact energy and the rebar is recyclable variety of applications. The bottom half of the at 3,480 blows per minmaterial. The attachment processor (shears) is ute. The unit’s reversible makes it easier to get rid of replaceable, and in about five minutes, can be rotation motors deliver demolition debris.” transformed into one of five different attachments. high torque to ensure HAMMERING powerful drilling; and its Photo Credit: Tramac AND DRILLING variable rotation is capable of speeds up to 250 rpm, which miniHammers are designed for breakmizes the risk of jamming, according ing concrete sidewalks and driveways, to Brokk. pavement, roads, masonry, site prep and landscaping, and breaking frozen SCOOPING AND MIXING ground for utility repairs. Caterpillar’s B Hammers are designed for construcAlthough many attachments designed tion and light demolition applications. for concrete are used in demolition appliThey feature a gas-fired design for cations, there are some that get used on consistent high production over the life the mixing/placing side. Most popular in of the attachment. The attachment’s this category are mixing buckets. flat top/top-mount style provides a Danuser’s newly updated Mega larger work area, excellent visibility Mixer mixing bucket allows operators and increases impact power by keeping to mix, scoop and dispense materials,
including bag-mix concrete. Material can be dispensed from either side due to mounts equipped on both sides. The latest changes to the Mega Mixer include an 8-in. diameter with an 8-in. pitch steel auger for faster mixing and dispensing, a new discharge end that is easier to operate, and an improved torque due to a 22.8-cu.-in. motor, which is capable of dispensing 3/4 yd. of material in 26 seconds. “The Mega Mixer is a very diverse material handling bucket that can mix, scoop and dispense a wide variety of material. It can handle mortar, grout, asphalt, topsoil sand, sawdust and concrete,” says Kurt Schellenberger, marketing manager at Danuser. “It is unique in that it is well suited to both construction projects and farms. With it, you can get in closer to the pour and in other tight spaces because the vehicle required to carry the attachment is much smaller than a mixer truck. Latest innovations include a new robust discharge end with a handle that controls the gate and gives users more flow control and helps them reduce spillage. "We also redesigned our auger. The 8-in. diameter steel auger with 8-in. pitch mixes and dispenses faster than the previous model. Twenty 80-lb. bags of concrete could be mixed in about five minutes. Also, we upgraded the motor so the unit now offers more torque,” Schellenberger adds. “Concrete is a great building material, but it can be tricky to work with. Original equipment manufacturers are designing attachments that make working with concrete much simpler and more profitable,” Galloway concludes. For more information on concrete attachments, visit the Canadian Concrete Expo Jan. 22-23, 2020, at the International Centre in Toronto.
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The Cat H80 hammer gets used in demolition and construction applications. The 1,000-ft.lb. category attachment features an impact frequency of 600 to 1500 blows per minute and is suited for carriers weighing more than 13,000 lbs.
Nathan Medcalf is the public relations representative for the Canadian Concrete Expo, Canada’s national concrete trade show, and a content creation specialist in the construction industry.
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CONCRETE EQUIPMENT
By Jeremy Wishart
4
Questions Contractors Should Ask When Considering Propane Construction Equipment While generators are the most commonly thought of propanepowered equipment, propane can now also power various concrete equipment, including riding trowels, grinders, polishers, floor strippers, dust extractors, shot blasters and concrete saws. Photo Credit: Propane Education & Research Council
Can your jobsites benefit from propane’s cost and emissions advantages?
F
or years, gasoline and diesel were cemented in the construction industry as the fuels to power equipment and vehicles, and electric equipment was seen as the primary option for indoor concrete work. But concrete contractors have likely seen another fuel showing up as an option in dealerships and rental businesses—propane. While it can seem easier to stick with the status quo rather than take a chance on different equipment, contractors who make the switch to propane equipment can see long-term benefits compared to
using gasoline and diesel equipment, particularly as the construction industry as a whole adapts to sustainability trends such as reducing emissions. But there’s a lot that goes into the decision to use new equipment, from the initial price tag to the total cost of ownership, including refueling, maintenance and fuel costs. Before deciding whether propane-powered construction equipment makes sense for their operation, contractors should take a closer look at the needs of their clients, requirements of their equipment and the types of jobsites that they most often work. The following questions can help concrete contractors better determine how propane could fit their operation.
DO MY CLIENTS REQUIRE REDUCED 1 EMISSIONS, OR WOULD
REDUCING EMISSIONS HELP MY BUSINESS LAND BIDS?
Contractors considering propane light construction equipment should first take a look at their clients, both for current projects or for future opportunities. Companies or local governments that
have sustainability plans or emissionsreduction goals may be more likely to seek out a contractor implementing green practices. Consumers also are increasingly likely to spend more for sustainable or environmentally-friendly services, according to a Nielsen report released in 2018. Contractors can reach these greenminded customers by calling out the environmental advantages that propane has compared to other fuels. For example, equipment using propane produces fewer greenhouse gas and nitrogen oxide emissions than gasoline or diesel and reduces sulfur oxide emissions compared to electricity when factoring in source-to-site emissions. The fuel is also recognized by the EPA as a non-contaminant of soil, water and air—a great point to call out when bidding for projects near schools and neighborhoods where spills or emissions from gasoline or diesel equipment could impact children or residents.
WHAT EQUIPMENT DO I USE THAT COULD BE 2 POWERED BY PROPANE? It’s likely that a contractor has encountered propane on a jobsite to fuel heaters and portable power generators. While those might be the most widely seen applications for propane, the amount of equipment that can be
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powered by propane has grown to encompass a wide range of light construction equipment. Now, contractors can find propane models for jobsite lighting and for concrete equipment, including riding trowels, grinders, polishers, floor strippers, dust extractors, shot blasters and concrete saws. The fuel can be used to efficiently move materials across sites with forklifts or wheel buggies or vertically with aerial lifts and small cranes. The types of light construction equipment powered by propane continues to grow as manufacturers incorporate propane in equipment lineups in response to demands for sustainability. Furthermore, brands that were once electric-only now offer engine-driven solutions powered by propane. This is in addition to the trend over the past couple years of manufacturers exploring options beyond diesel for light construction equipment. Contractors can take advantage of propane’s benefits beyond light construction equipment, too, by using propane autogas in vehicle fleets. An increasing number of light- and medium-duty work trucks and vans can be converted to run on propane autogas, including chassis upfitted with dump bodies, cranes or box options.
DO I FREQUENTLY WORK IN BOTH 3 INDOOR AND OUTDOOR ENVIRONMENTS?
For contractors with a diverse range of projects that frequently require equipment to be used indoors or outdoors, propane equipment is advantageous in several ways. For one, propane’s emissions profile enables the fuel to be used both indoors (with proper ventilation) and outside. Along with reducing greenhouse gas emissions, propane light construction equipment produces fewer carbon monoxide emissions. Additionally, propane is a highly portable fuel. On sites that aren’t yet connected to utilities or are located beyond the electrical grid, it enables work to be completed without the need to bring in an alternative power source for electric equipment. Using propane can reduce the number of potential trip
hazards from electrical cables when operating several pieces of equipment at once, such as concrete grinders and vacuums. Contractors using propane also don’t need to juggle multiple pieces of equipment when working on a site with both indoor and outdoor needs or moving between sites with different emissions requirements. This can help reduce costs in equipment rentals or upkeep and even increase daily crew productivity.
LevMix Mobile Mixer
ARE MY CURRENT REFUELING NEEDS? 4 WHAT
Contractors using diesel or gasoline may find that fuel is widely available at commercial refueling stations, but filling portable fuel containers each day can take time that can otherwise be spent on a jobsite. For contractors working on long-term construction projects, conventional fuels may also require additional precautions to store a bulk tank on site in order to prevent fuel leaks into soil and water. In comparison, propane offers contractors two convenient refueling options: a cylinder exchange program and on-site refueling tanks. With a cylinder exchange program, propane cylinders are typically stored in a cage either at a corporate location or on a jobsite. Contractors can work with a propane retailer to set a schedule to exchange empty cylinders with full ones for an easy, grab-and-go system for employees. For a larger scale application, a propane tank can be installed at a permanent location, or a portable propane tank can be set up on site for long-term projects. Propane fueling infrastructure is similar to gasoline and diesel, typically with fuel stored in above-ground tanks ranging from 1,000 to 30,000 gallons. Contractors considering propane equipment can find additional information on using propane-powered light construction equipment by visiting Propane. com/Propane-Products/ConstructionEquipment. Additionally, the Contractor’s Guide to Propane is available online at ContractorsGuidetoPropane.com.
Jeremy Wishart is the director of off-road business development for the Propane Education & Research Council. He can be reached at jeremy.wishart@propane.com.
The new LevMix unites three steps in one operation: • • •
mixing transporting pouring
The new LevMix mobile mixer combines the attributes „FAST and EASY“. Mix several bags in the shortest time.
www.collomix.com WOC Booth #S13045
www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor 47
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SPECIFICATION GUIDE: DUST COLLECTION
4. B
Dust Collection
A compilation of technical information when choosing your next dust collection system. 1. DUSTCONTROL INC. STORM 600 LPG Powered by propane, Dustcontrol’s DC Storm 600 LPG will operate approximately 8 hours on a full tank. • External self-discharging cyclonic air filter with visual filter monitor • Weight distributing chassis set for early entry saw application ForConstructionPros.com/21092957 World of Concrete Booth #S12253 Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
DC Storm 600 LPG
63” x 31” x 71”
570 lbs.
21 hp
NA
LPG
501 cfm
112 inwg
Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
DC Tromb 400 L
27” x 22” x 54”
106 lbs.
2100 Watts
115 V
Single
212 cfm at the inlet
N/A
Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
DC Storm 600-L
45’ x 30” x 69”
375 lbs.
10 hp 230v
7.5 kw
Three
371 cfm at the inlet
N/A
2. GENERAL EQUIPMENT VS220 DUST-COLLECT-R SYSTEM The VS220 portable vacuum system offers an effective dust control system for use with surface grinders, planers and other surface preparation solutions. • Features a 99% efficient at 0.5 micron pre-filter and a 99.7% at 0.3 micro HEPA secondary filter • Two 115-VAC, 60-Hz single-speed electric motors produce a peak of 2.6 hp, air flow volume of 220 cfm and water lift suction of 110 in. • Separate 2- and 3-in.-diameter dust port connections for simultaneous or independent operation ForConstructionPros.com/20974042 Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
VS220 DUST-COLLECT-R System
34.5” x 19” x 35.3”
100 lbs.
2.6 peak hp (2 motors)
115 VAC, 60Hz
Single
220 cfm
N/A
3. SCANMASKIN SCAN DUST 2900 ScanDust 2900 gives you high operational reliability and efficient performance. The dust collector is equipped with: • Hepa 13 filters that take care of insanitary particles • Longopac, which allows for easy and dust free changes ForConstructionPros.com/20983622 World of Concrete Booth #S11639/#O31918 Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
ScanDust 2900
22” x 31.5” x 51”
119 lbs.
3.8 hp
220-240V or 115V
Single
420 cfm
3.34 psi
Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
ScanDust 3600
38”x 23” x 54“
198 lbs.
5.1 hp
230 V
Single
500 cfm
4.35 psi
Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
ScanDust 8000
44”x 29” x 21“
474 lbs.
7.4 hp
400 V
Three
530 cfm
4.35 psi
48 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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ions.
4. BW MANUFACTURING B-101 PULSE VAC BW Manufacturing’s B-101 Pulse Vac features a built-in air filter pulsation system that continuously clean the air filter with compressed air making it ideal for removal of fine dust powders without clogging. • Twin vacuum motors • On-board air compressor ForConstructionPros.com/21095103 World of Concrete Booth #S11927 Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
B-101
33” x 16” x 39.5”
131 lbs.
N/A
120V
Single
205 cfm
N/A
Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
B-202-G
34.5” x 28” x 59”
375 lbs.
5 hp
N/A
N/A
1105 cfm
N/A
Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
A-404-G
42” x 34” x 61”
590 lbs.
5.5 hp
N/A
N/A
1175 cfm
N/A
5. LAVINA V20G-X Superabrasive’s Lavina 20G-X is a propane vacuum designed for use with 20 in. or smaller grinders. It’s features include: • Kawasaki engine FS481V • Conical main filter, plus Hepa H13, manual filter cleaning • Longopac bagging system, anti-static hose with metal camlock provides a simple, efficient and cordless dust collection ForConstructionPros.com/21033223 World of Concrete Booth #O30840/#O31034/#S10539 Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
Lavina 20G-X
51” x 26” x 56”
441 lbs.
14.5 hp
N/A
N/A
212 cfm
4 psi
Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
Lavina 32G-X
59” x 30” x 64”
850 lbs.
14.5 hp
N/A
N/A
410 cfm
4.35 psi
Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
Lavina 25-X
37” x 24” x 64”
247 lbs.
3.4 hp
115 V
Single
286 cfm
2.9 psi
6. MINNICH DUST COLLECTION SYSTEM This system features Venturi-style suction to collect dust where the drill steel impacts the concrete, preventing the dust from entering the air. The dust collector meets the requirements for dowel pin drills found in Table 1 of the OSHA final respirable crystalline silica standard when used with an appropriate filter. The unit can be retrofitted to any Minnich on-grade, on-slab, machine-mounted or utility drill model and competitor dowel drilling units. ForConstructionPros.com/20983601 World of Concrete Booth #C4213 Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
Single Canister
48” x 17” x 40”
198 lbs.
N/A
N/A
N/A
50 cfm
60 psi
7. ADP 10 DUST COLLECTION SYSTEM APT’s ADP 10 dust collection kit includes a vacuum suction unit, 21-ft. suction hose, universal shroud connector, three dust collection bags and three bellows. • Creates a vacuum using compressed air • Vacuum suction capacity of the system is over 4 ft. of water • Filter has the capacity of 99.58% filtration of exhaust air ForConstructionPros.com/21093246 Model
Dimensions (LxWxH)
Weight (lbs)
Power Output (hp)
Voltage
Phases
Air Flow (cfm)
Max vacuum (psi)
ADP 10
N/A
55 lbs.
N/A
N/A
N/A
25 cfm
N/A
www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor 49
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sinology/ iStock / Getty Images Plus
How to Close the Maintenance Gap Between Contractor and Custodian by Amy Wunderlin
Y
ou wrap up a beautifully polished concrete floor, and a year later your client calls complaining of visible wear. While low maintenance often is the top reason a client chooses a polished concrete floor, it doesn't mean there is no maintenance. Until the
industry is able to communicate that effectively, contractors will continue to receive callback after callback for floor failures. In fact, maintenance is one of the more difficult things the industry sees, says Greg Cabot, digital marketing manager for Ameripolish, a manufacturer of architectural
concrete products. “A lot of times there is a gap between maintenance and polishing,” he notes. “Janitorial crews will come in and ruin a tremendous floor. Contractors will often get called back because the maintenance team is using something that’s not suited for the floor.”
50 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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s
complete solutions for floor grinding, polishing and maintenance
We manufacture a wide range of tooling options for every job from prep and removal to daily maintenance. We have added a variety of hybrids and resins to our Quick Change tooling portfolio, so you can work more efficiently.
visIt us at the shows to see our latest products! www.superabrasive.com
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BOOTHS: S10539, O31034, O30840
BOOTH: B9003
12/3/19 11:24 AM
But, whose really at fault? The maintenance staff that used the wrong products on the floor, or the contractor and floor owner who failed to properly communicate the maintenance requirements and provide the proper system to care for the floors? It’s likely a mix of both. This gap between contractor and custodian can be a challenge, but proper maintenance of polished concrete does not have to be expensive or difficult. It simply needs to be addressed and implemented—and the sooner in the process the better. “A neglected floor will eventually turn into a failed floor and lead to unhappy floor owners,” sayss Jon Hughel, a polished concrete industry veteran, in a series of polished concrete maintenance articles. He adds that pairing the floor owner with a polished concrete
aydinmutlu/ E+
system that meets their aesthetic requirements and fits with their maintenance capabilities—while fully informing the owner of what the maintenance requirements of that system will be—is critical to the floor
CONCRETE CURING COVER
the curing cover designed with safety in mind
MEETS ASTM C171
IT’S DIFFERENT EXTREMELY DURABLE
ANTI-SLIP SURFACE
TRANSHIELD-USA.COM/TOPCURE
HYDRATING PODS
owner's long-term satisfaction, but it is rarely done. “It is important to be able to tailor the floor as installed to meet these factors and avoid the temptation to provide a cookie cutter, onesize-fits-all approach,” he says. For example, a clothing retailer and an industrial warehouse will have very different needs. The clothing retailer will require very high aesthetics but have light foot traffic and limited capability to provide their own maintenance. Thus, a highly refined polish level (3000 grit+) with a guard stain protector will fulfill the high aesthetic requirements, and a maintenance system incorporating minimum input from in-house staff (daily dust mopping, weekly spot mopping) and quarterly periodic maintenance from an outside vendor would be appropriate. An industrial floor with low aesthetic requirements but heavy traffic and low maintenance staff would be better suited to a floor refined to 400 grit, protected with a penetrating stain protector, and a maintenance system that has in-house personnel auto scrubbing the floor with appropriate cleaner and pads weekly and bi-annual reapplication of the impregnating stain protector. “It can take some creativity and forethought to make the correct match of floor system with owner
52 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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r i fl a f H t r t
M
k i s i
fl d p B i
a c w i m t y p i t
c s p
requirements and capabilities, and it can be difficult to ensure that the floor owner understands what the appropriate maintenance system for the floor provided requires. However, the payoff is customers that are satisfied long-term and the reputation and recurring business that stems from that,” says Hughel.
With these products, “every time you mop the floor, you’re putting sealer back on the floor,” he explains. Rather than relying on daily mopping, Cabot suggest the use of an auto scrubber once or twice a day to get any spillage off the floor as quickly as possible. “Particularly in a school setting, it’s a perfect case scenario for putting someone on an auto scrubber and doing daily maintenance instead of getting multiple people out there mopping,” he says. Reapplying the stain protector is also an important factor in stain prevention. Hughel notes that both guard and penetrating type stain protectors will wear over time, thus the manufacturer's recommended reapplication schedules should be followed.
“All guards will wear, especially in high-traffic areas,” adds Cabot. Worst case scenario, a guard would need to be replaced bi-annually, but in a lower traffic setting he recommends reapplying a guard once a year, so that the wear is on the guard itself and not the concrete surface. If the surface is treated with a penetrating stain protector rather than a guard, Hughel recommends incorporating cleaning pads with specifically engineered abrasives that will re-refine the surface and repair any damage incrementally, before there is significant deterioration in the aesthetic appearance of the floor. “If this is not done, then the damage to the floor will eventually be so great that an intensive restoration is required, and in the most extreme cases, necessitates a full regrind and polish,” he warns.
MAINTENANCE BASICS Communication ultimately is the key to proper maintenance of polished concrete, but a general understanding of the basics always comes in handy. Maintenance of dyed polished floors is very minimal so long as you do it correctly, says Tyler Balch, vice president and principal at Texas Bomanite, a contractor that specializes in architectural concrete. Because concrete is porous and easily absorbs moisture, timely cleanup of any spill is critical even when a stain protector has been installed. Balch advices his clients to mop polished concrete with a neutral PH cleaner, and once every few years, re-varnish the floors using a propane varnisher with a diamond impregnated pad, which heats up the guard and renews the shine. Balch also recommends floor cleaners that contain a little bit of densifier and guard in them, which further protect the floor and acts as a sealer.
WE HAVE YOU COVERED
PECORA-DECK 800 & 800 FC SERIES LONG-LASTING PROTECTION AGAINST THE ELEMENTS Durable, elastomeric Pecora-Deck coating systems deliver resilient protection against the elements and traffic; whether it’s for maintenance, restoration, or a new structure. Surfaces are shielded from damage caused by vehicular and pedestrian traffic abrasion, and the destructive forces of sun, water, temperature shifts, and corrosive chemicals. Choose the coating system that fits your project and protect the investment that has been made in the deck surfaces.
Ph: (215) 723-6051
| (800) 523-6688
| pecora.com
www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor 53
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Concrete Polishing Restores Luster to Vintage Motorcycle Museum A collaborative effort brought new life to the museum’s floor, which was stripped of its various floor coverings, stains and wear from decades of heavy traffic.
F
or a concrete refurbishing contractor, having grinders and related polishing equipment at work on a jobsite is essential. But when that equipment is down for repairs or needed at another location, what are the options? For PaintSmiths of Missouri, the answer was Sunbelt Flooring Solutions, a nationwide company that rents a full line of concrete grinding and polishing machines, tooling and HEPA dust collectors. PaintSmiths turned to Sunbelt for the equipment required to tackle a concrete polishing project at Moto Museum in St. Louis. The Moto Museum is a 16,000-sq.-ft. facility that houses a collection of vintage motorcycles dating back to the turn of the 20th century, including some of the rarest bikes still in existence. The museum,
which grew out of the private collection of owner and founder Steve Smith, has six galleries featuring unique motorcycles from around the world. Two of the museum’s galleries are leased for special events such as conferences, retreats, weddings, birthdays and family reunions. A recent renovation project at Moto Museum entailed a plan to repair and polish a worn concrete floor in an event gallery. The floor had a variety of coverings, including paint, epoxy, carpeting, luxury vinyl tile and vinyl composite tile, and was stained, scuffed and worn from decades of heavy traffic. “Our normal inventory of grinding and dust control equipment was wrapped up on other jobsites,” explains PaintSmiths’ Project Manager Jeff Hasty. “So, I gave my Sunbelt Flooring Solutions rep Dallas Hill a call, and Sunbelt and Niagara became resources for the machines we needed on this job.” Hill adds that "a contractor shouldn’t have to postpone or turn down jobs due to equipment shortage or unavailability. Our goal at Sunbelt Flooring Solutions and Niagara is to be sure these guys have the best machines and materials available to get their jobs done.
Paint and epoxy were removed with a propane-fired Lavina 30-GTX forced belt-driven planetary grinder. Photo Credit: Niagara Machine Inc.
It’s a win-win situation for them and for us. And for their customers, too.” The Moto Museum floor refurbishing project was a joint venture between PaintSmiths, Sunbelt, Niagara Machine Inc. and Sherwin– Williams H&C division, which supplied the concrete treatment chemicals used for the project. PaintSmiths’ services include painting, coating, wall covering and floor staining, coating and polishing for commercial, industrial and high-end residential projects. Niagara Machine is a concrete flooring and surface
54 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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Layers of paint, epoxy, carpeting, luxury vinyl tile and vinyl composite tile once covered the floor at the Moto Museum in St. Louis, which houses some of the rarest motorcycles in existence. Photo Credit: Niagara Machine Inc.
preparation specialist and a national distributor of grinding machines, shot blasters, scrapers, dust extractors, air scrubbers, diamond tooling and chemical treatment products. Niagara supplies both Sunbelt Flooring Solutions and Sherwin-Williams with concrete resurfacing equipment and is a resource for comprehensive, hands-on training for concrete contractors, building maintenance managers, and others involved in concrete floor restoration and preservation. In the initial phase of the project, the 4,000-sq.-ft. event gallery was stripped of existing paint, tile, carpeting and adhesives. The luxury vinyl tile and composite vinyl tile were removed using a BlastPro scraper,
and paint and epoxy were removed with a propane-fired Lavina 30-GTX forced belt-driven planetary grinder. This grinder features fast, cordless operation, clean exhaust, simple tool changes and balanced, easy-to-control handling. A DiamaPro SVX3A HEPA dust extractor and AS-2000 air scrubber handled the dust control. With all floor coverings, adhesives and epoxies removed, minor repairs were made, and the floor was ready for multi-step grinding. “We started the grinding and polishing process with 30-grit diamonds and worked our way up through 50, 100, 200 and 400-grit stages. Then we used an 800-grit tool for the final polishing,” explains Hasty. The last phase of the Moto Museum project entailed staining and sealing the gallery floor. Sherwin-Williams H&C acetone dye stain was selected in ranch hand brown and tortoise shell hues to
complement the gallery’s décor. The dye stain was applied after the 400grit polishing stage, along with a clear liquid hardener/densifier. After the final polishing with 800-grit, the surface had the desired matte finish.
Photo Credit: Niagara Machine Inc.
The PaintSmiths’ crew completed the Moto Museum repair and polishing project in one week, including the downtime required for other trades on-site to utilize the gallery floor. “This was a very efficient project,” says Hasty. “We had the right equipment in the right hands, and the result is a beautiful concrete floor. It will make a great contribution to the overall Moto Museum experience.”
Lythic Polished Concrete Products offer a complete flooring solution with unique colloidal silica technology. 100% reactive silica ensures the concrete is chemically hardened prior to mechanical polishing. Use Lythic Densifiers, Protectors, and Cleaners for long lasting performance. For more information, visit www.lythic.com
www.solomoncolors.com • www.lythic.com 800.624.0261
www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor 55
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WOC Idea File FASTFOOT® - 100 times lighter than lumber - Adapts to uneven ground - Rapid setup and strip
• Anti-slip “grit” surface prevents accidental slips and falls • Durable and strong – light construction traffic will not penetrate the material • Water retaining inner surface to provide sustained moisture to the slab • Clean nonwoven - NO super absorbent polymers (SAPs) or other additives that leave behind a residue • Complete lamination – nonwoven and film layer are a single piece making it lay flat and easy to cut
XTool Xtreme is proud to introduce it’s Patent Pending, Innovative Design for effortless and efficient joint cutting, cleaning and crack chasing, making work easier in the concrete coating and concrete polishing industries.
transhield-usa.com
Email: XtoolXtremeinc@gmail.com Phone: 407-487-1832 Xtoolxtremeinc.com
www.fastfoot.com (888)303-3278
SU
No longer will we have to settle for a clumsy piece of equipment coming between us and the work surface, not when the X-10 Arm Xtension makes the business of cleaning out expansion joints effortless, like an extension of an arm.
C O V E R
CU TT NT JO I
PE R
XXt 10 en A sio rm n
Once assembled, no tools are required to adjust the length to maximize the comfort and visibility to your particular height, giving you greater control and a fatigue-free operation, resulting in reduced operational time and increased profits.
C U R I N G
ER
XTool Xtreme is proud to introduce it’s Patent Pending, Innovative Design for effortless and efficient joint cutting, cleaning and crack chasing, making work easier in the concrete coating and concrete polishing industries.
C O N C R E T E
Features include: ★ Weight supporting single wheel design with depth adjustment ★ Angular pivoting of the cutting wheel for straighter cuts ★ The remote switch is conveniently placed alongside the handle for safety
★ Arm support and handle for comfort and slip resistant grip ★ Baton style handle for one handed operation with exceptional control ★ Adjustable length along with a hook & loop strap on the arm support ensures incredible balance and stability
Email: XtoolXtremeinc@gmail.com Phone: 407-487-1832 • Xtoolxtremeinc.com
Sponsored by Superior Artistic Texture, Inc.
56 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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WOC Idea File
REMOTECONTROLLED
L32RE - 32-inch, 3 phase, 220V or 480V; L25RE - 25-inch, 1 or 3 phase, 220V
Lavina Elite remote-controlled grinders combine durability, flexibility and ease of use, along with all the bells and whistles that contractors love in a grinder to make their job easier. They come with a digital control panel or HMI that provides essential operating information, including power load and voltage supply, machine hours, hours per day, tool holders speed / RPM with option to choose setting with tool input, speed feed rate, water supply and lights activation, maintenance reminders, password activation and shutoff. The remote control unit is super light, precise and easy to use, with integrated mapping on the offset and various functions. These grinders can be used in manual and self-propelled mode as well. They are equipped with all the new Lavina Elite features, such as: dustproof grinding head; integrated weights; misting system and heavy duty water pump; built-in electrical protection against excessive voltage damage; new handle bar; floating skirt with a flexible brush; adjustable LED lights; phone charging station and cup holder. Both models have large non-marking tires and a third wheel for easy transportation. www.superabrasive.com
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WOC Idea File
Verify ACI Certification The American Concrete Institute’s Certification Verify app allows users to quickly and easily verify the status of ACI-certified individuals through three search options: (1) verify an individual’s certification ID number, (2) search by an individual’s name, and (3) find the total number of ACI-certified individuals in an area. Accessible through a phone or tablet, the app is the perfect tool to use on the jobsite to verify the status of people working on a project. Using the same functionality of the popular concrete.org/verify webbased verification tool, the ACI Certification Verify app helps the entire verification process become more seamless so jobs can keep moving forward. The app is currently available in iOS platforms. An Android version is expected to be available soon.
Learn more about ACI Certification at whyACICertification.org. 58 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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WOC Idea File GO BEYOND TRACKING AND A DOT ON A MAP WITH TENNA. Tenna is the construction technology platform that revolutionizes equipment fleet operations. Tenna lets you know more, with uninterrupted, reliable tracking on a unified platform for mixed fleets. Tenna built their solution on over 100 years of construction experience so that contractors would have a solution that solves their day-to-day struggles with their entire equipment fleet. In addition, Tenna lets you control more with visibility from the machine level to the project, all the way up to your entire company. The result is that you make more money with better own, move, buy/ rent decisions, higher utilization and more predictable days.
Learn more about how Tenna can help revolutionize your fleet.
www.tenna.com
www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor
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WOC Idea File WE’VE PUT A NEW SPIN ON CORDED ROLLER SCREEDS!
• Enjoy simple setup with one-pin connect • Transport anywhere with a folding handle • Internal cord storage make transfer a breeze • Built strong with an all-steel housing
To learn more about the Eel Screed, call or visit our website today!
In 2000, Reliable Diamond Tool, Inc. established sole representation for Precision Metallurgy. We bring you 60+ years of manufacturing experience in Diamond Tooling. RDTI stocks a wide variety of specifications for use in Concrete Construction.
785-467-3132 www.curbroller.com
WWW.REDITOO.COM
The Next Generation Of Decorative Concrete Flooring! Aurora Epoxy Dust is a new type of epoxy flooring system unlike anything the industry has seen before. A high definition 3D image is achieved by blending metallic pigment with clear epoxy binder that results in seamless sheer elegance. Aurora Epoxy Dust reflects light rather than absorbing it, producing a floor that has more depth and dimension than what is obtainable with concrete staining.
Our system provides the ultimate uniform surfacing solution. Professional contractors recognize the true value of a fast application process that greatly decreases down time, potential for non-uniformity and other stress factors associated with concrete stains and overlays. To learn more about Aurora Epoxy Dust visit our website at www.mckinnonmaterials.com or contact us at 1-866-622-7031.
60 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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WOC Idea File Rapid Form Bracket
WE HAVE YOU COVERED
PECORA-DECK 800 & 800 FC SERIES
Innovative Concrete takes decades of hard earned concrete experience and mixes it with modern innovation. Our products increase quality, safety and cost savings.
Rapid Form Bracket The rapid form bracket is OSHA compliant and is designed to take the place of lumber, eliminating the labor and cost involved in purchasing, layout, measuring, cutting, constructing, and cleaning up after stripping.
Email: info@iconcrete.us Phone: 484.356.4498 Location: Downingtown, PA
LONG-LASTING PROTECTION AGAINST THE ELEMENTS Durable, elastomeric Pecora-Deck coating systems deliver resilient protection against the elements and traffic; whether it’s for maintenance, restoration, or a new structure.
Lythic Polished Concrete Products offer a complete flooring solution with unique colloidal silica technology.
Surfaces are shielded from damage caused by vehicular and pedestrian traffic abrasion, and the destructive forces of sun, water, temperature shifts, and corrosive chemicals.
100% reactive silica ensures the concrete is chemically hardened prior to mechanical polishing. Use Lythic Densfiers, Protectors, and Cleaners for long lasting performance.
Choose the coating system that fits your project and protect the investment that has been made in the deck surfaces.
For more information, visit www.lythic.com
https://iconcrete.us/ Ph: (215) 723-6051 | (800) 523-6688 | pecora.com
www.solomoncolors.com • www.lythic.com 800.624.0261
Oztec’s winning combination for consistently superior consolidated concrete is the Oztec BP-50a backpack and patented RubberHead®. The BP-50a backpack with a powerful Honda engine and a patented, totally enclosed rotary throttle, eliminates improper setting of the engine speed and ensures optimum consolidation. A clog-preventing kill switch is also conveniently located on the same handle. Combining the BP-50a and the RubberHead is a natural! The patented Oztec RubberHead®, originally developed to protect-epoxy coated rebar immediately displayed other significant advantages. The unique design, with large openings, allows the wet concrete to cool the inner shell while acting as suction cups keeping the concrete in contact with the entire length of the head which creates a stronger radius of action along its entire length, eliminating voids and producing a more dense concrete with a better cosmetic finish.
Contact Oztec at: 1-800-533-9055 or visit us at World of Concrete, booth #N2236 www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor
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WOC Idea File VISIT US! World of Concrete 2020 Booth #S10838
Manufactured at our state-ofthe-art facility in Springfield, Illinois, Brickform sealers use the highest quality materials. Trust Brickform solventand water-based sealers to enhance color, resist staining, and protect your hard work. Quality sealers, coatings, and cure and seals.
www.brickform.com 800-624-0261
ENTER FOR A CHANCE TO WIN A 2020 IRON 883Ž HARLEY-DAVIDSONŽ 3 WAYS TO ENTER: 1. Email your business card to: contest@wagmanmetal.com for one time free entry. 2. Purchase $100 of any Wagman or GHP product and get one entry. 3. Purchase $1000 of any Wagman or GHP product and get 12 entries. Get your entries by sending your Wagman Receipts to: contest@wagmanmetal. com. No purchase necessary. Void where prohibited. Contest entries are only valid in the Contiguous United States, but not valid in California. Visit wagmanmetal.com/rules20. All taxes, tilting, and licensing are the responsibility of the Grand Prize Winner. Retail Customers Only. “Harley-Davidson Motor Company is not endorsing, or otherwise affiliated with this promotion.�
Protects: Concrete â—? Terrazzo â—? Tile Stone â—? Hardwood Protection from machinery, forklift, and foot traffic Significantly better than hardboard or plywood Extremely high impact protection Lightweight, reusable Resists curling and warping Slip-resistant, fire retardant
Innovative, purpose-built surface protection systems. This is all we do.
www.skudousa.com
62 Concrete Contractor | December 2019 | www.forconstructionpros.com/concrete
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WOC Idea File
BackSaver Hammer Drill Attachment
www.hammerdrillattachment.com
PORTABLE REBAR BENDER/CUTTER The Model FS-600 portable rebar bender/cutter will both bend and cut up to #6 rebar.
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BackSaver is an innovative product that allows the user to stand while drilling dowels. BackSavers are available to fit Hilti, Bosch, Makita and Dewalt hammer drills.
• Plugs into a standard 110-volt outlet • 180 lbs. • Fabricate stirrups, hooks and 3-D bends and cut bars to length • Convenient carrying handles for on-site or at the shop
WOC Booth #N3050
www.fascut.com
Patent Pending Adaptor 15/333,366 BackSaver Patent 3761885
LARGEST SELECTION OF
VIBRATORY SCREEDS
SEE US AT BOOTH #031912 OUTSIDE LOT
✓ GAS POWERED VIBRATORS ✓ VIBRATING ROLLER TAMP ✓ LARGEST SELECTION OF ROLLER SCREEDS
WWW.MULTIVIBE.COM TOLL FREE 1.877.220.6652 PHONE: 1.270.554.2615 FAX: 1.270.554.0631
www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor
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WOC Idea File GFRC
FOR
PROFIT
JANUARY 8-9
VERTICAL CONCRETE FOR
PROFIT
JANUARY 10-11
TIPS, TECHNIQUES, & BUSINESS SECRETS
CALL (607) 775-1948 TO REGISTER 40 GROSSETT DRIVE, KIRKWOOD, NY | WWW.TRINIC.US
Collomix LevMixMobile Mixing Machine. Mixing and Transporting in one operation. For selfleveling and leveling compounds. Ideal for floors and subfloors. Highly effective mixing paddle prevents the formation of lumps; all material is mixed thoroughly.
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ONEIDA AIR SYSTEMS
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CC500 Dust Extractor The CC500 is a portable, high pressure dust extractor ideal for concrete cutting, drilling, grinding, and cleanup. Its triple motor system provides unbeatable airflow performance from the tool to the premium HEPA filter to comply with new OSHA silica dust safety standards. Includes adjustable height stand. Made in USA. Learn more at oneida-air.com/concrete.
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WOC Booth #S13045
QUIKRETE ADVANCED POLYMER SEALANTS & ADHESIVES
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www.collomix.us ®
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QUIKRETE® Advanced Polymer Sealants & Adhesives are a solvent and isocyanate free line of high-performance, commercial-grade flexible repair and bonding materials that meet ASTM C920 standards. Designed to deliver or exceed the performance of traditional polyurethane or silicone sealants and adhesives, the QUIKRETE® Advanced Polymer Sealants & Adhesives are five single-component, environmentally-friendly alternatives.
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*10 is highest ranking
www.quikrete.com
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INDEX ADVERTISER ............................................ PAGE American Concrete Institut .................................................. 43, 58 BackSaver .............................................................................. 13, 63 Bloom Manufacturing Inc........................................................... 16 Caterpillar Dealer Network ........................................................ 19 Collomix USA ....................................................................... 47, 64 Cummins Engine Company Inc ................................................... 5 Curb Roller Mfg. LLC ............................................................ 60, 65 Diteq Corp. ........................................................................... 25, 63
Get Your Free Tradeshow Secrets Book Call 877-327-5246 Now “Fantastic Tradeshows TRIPLED our tradeshow traffic”
“They brought a crowd around us and really got everyone to focus on our product”
- Beat Erb-IBM
– Kristin Fisher – Crown Mfg.
Fab-Form ............................................................................... 17, 56 Fantastic Trade Shows ................................................................ 65 Fascut Industries ................................................................... 16, 63 Gomaco Corporation ................................................................... 2 Innovative Concrete ............................................................. 35, 61 Jlin Corp ................................................................................ 15, 63 Ligchine International Cor ..................................................... 7, 59 McKinnon Materials, Inc. ...................................................... 39, 60 Minnich Manufacturing .............................................................. 21 Oneida Air Systems .............................................................. 37, 64 Oztec Industries Inc. ............................................................. 61, 68
Tired of shelling out thousands of dollars on exhibit ideas that don’t earn their keep? Maximize your return on your tradeshow investment. Request a FREE copy of my tradeshow secrets book, Tradeshow Lead Conversion Secrets For A Higher ROI ROI. Packed with tips, this book has helped hundreds of trade show exhibitors get their booth and staff show ready. Maximize your lead generation and avoid many of the growing pains that have cost other companies a lot of money.
Call 877-327-5246 Now!
Pecora Corporation .............................................................. 53, 61 Putzmeister America............................................................. 33, 57 Quikrete................................................................................. 31, 64 Reliable Diamond Tools ....................................................... 12, 60 Skudo USA Inc. ..................................................................... 24, 62 Solomon Colors ........................................................ 40, 55, 61, 62
Shape concrete up to 2X faster than traditional methods
Somero Enterprises .............................................................. 23, 62 Stego Industries .................................................................... 11, 58 Superabrasive Inc ................................................................. 51, 57 Tenna ..................................................................................... 29, 59
Thanks to the innovative roller screeds by Curb Roller Mfg, you can tackle anything from flatwork to v-gutters, and more!
Transhield .............................................................................. 52, 56 Trinic....................................................................................... 41, 64 Vacuworx Global ......................................................................... 34 VoidForm Products, Inc. ....................................................... 55, 60 Wagman Metal Products Inc.................................................. 9, 62
Screeds. Made For You.
World of Concrete ...................................................................... 67 X-Tool Xtreme, Inc. ..................................................................... 56
Whether you order a Curb Roller, Hydra-Screed, Batt Screed, or Eel Screed, our customized service ensures you have what you need to get the job done.
* Denotes Regional Ad
785-467-3132 curbroller.com
112 S. Main Street Fairview, KS 66425
Booth O32034
www.forconstructionpros.com/concrete | December 2019 | Concrete Contractor
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THE LAST PLACEMENT
By Brad Humphrey
Crew Foreman…
Study Your Job Folder!
kali9/ E+
M
y wife would tell you I was terrible about putting together toys for our kids at Christmas. Once when we purchased a play kitchen that had to be assembled for my six-year-old daughter, I was up 'till almost the time the kids awoke on Christmas Day putting together that stupid thing. Finally, I finished, but I had about 15 extra pieces that I just couldn’t figure out where they were supposed to go. The reason for my stupidity? I never read the directions because I knew how to build. And, I sure as heck knew how to put together a simple plastic kitchen set that my daughter would enjoy making make-believe food for her dolls—and dad. I was reminded of this memory this past week when conducting training with crew foremen and project managers (PM). A PM shared that he wished the foremen would actually read through their Job Folder before sitting down for their pre-construction meeting. In fact, several of the foremen admitted that they didn’t always take the time to read through everything about the job, as they should. Okay crew leaders, let’s get to the heart of this issue. The Job Folder is your best set of “instructions” for what will be needed on the project. Sure, once in a while, a PM or estimator could be more detailed, provide more pictures, share more insights about the customer, etc. Your company needs to continue to work on that improvement. However, going to the jobsite, not having read through the Job Folder, can cause you to “feed” more possible mistakes, such as "go-backs" and
rework. You can stop 80% to 90% of these negative experiences, by simply reading the Job Folder—before starting the project. Now, for any foreman who does not always read through their Job Folder, blaming it on a lack of time, let me offer some encouraging words of improvement. How long does it take to really walk through the Job Folder? Depends on the job size, I know. But for most pavement maintenance foremen, taking the time may include: • Review the Job Folder for 15-30 minutes in the evening at home. • If you have the Job Folder early enough, read a little bit over a lunch break at a current job you are working. • Catch a few more minutes of study time while your crew may be waiting on material for the job you’re trying to finish up. Over the past few years, most foremen I have discussed this opportunity with have shared the average time of Job Folder review is only about 15-30 minutes. Isn’t 15-30 minutes spent reviewing the Job Folder worth the risk of not being aware of the scope of work or raising the questions you have at a preconstruction meeting (hopefully you practice this pre-start meeting...)? Isn’t this time spent reviewing the Job Folder worth ensuring we make more money on the project—and therefore, more money for us personally? Part of the commitment any project manager or estimator should have is to ensure that they get the Job Folder pulled together, with the needed information, sign-offs, pictures, etc.
and delivered to the foreman so they have more than an hour to look at their best-projected plans and thoughts before starting the job. However, when the season gets crazy with customers, each demanding to start work quickly, your PMs, and many of the office team, are working quickly to get all the needed info pulled together to keep you with the right information—and to ensure that everything thing is clean… legally. Foremen, don’t give up on your PMs, estimators and any other company employee supporting you. They’re working hard to keep the work coming. Remember, your owner doesn’t want to take work at just any price; everyone wants to make a profit—a nice profit. You’re not working for a non-for-profit organization. At the very heart of better work, safer work and more profitable work is doing our jobs right—the first time. A huge key to this happening is to have your PMs and estimators pull together the Job Folders correctly, and have each foreman committed to reading through it. Don’t be bashful, but be quick to highlight something that is difficult to understand; or write down a question that you want to ask your PM to ensure you have the right perspective of the project. No matter when you are given the Job Folder, read and study it before ever even leaving for the site if possible. Don’t be like me when I was working all night putting together my little girl’s kitchen set for Christmas. You might just leave out a few things that really need to be performed on the project. Let your next Job Folder provide the roadway to your success.
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WE DON’T JUST DABBLE IN CONCRETE AND MASONRY. We’re the authority on it. That’s why each year, WOC is the first and only annual international event to bring you all the new products & equipment, training and technology to get the job done faster and more profitably than ever before. Join us, and in just five days you’ll find everything you need to conquer the year ahead.
FEBRUARY 4-7, 2020 EDUCATION: FEBRUARY 3-7 LAS VEGAS CONVENTION CENTER LAS VEGAS, NV, USA
REGISTER TODAY worldofconcrete.com
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