Concrete Contractor December 2021

World of Concrete 2022 Product Preview December 2021

THE LEADING TRADE MAGAZINE IN THE CONCRETE INDUSTRY

How to Make

CONCRETE MARBLE

IT’S A TERRIFIC TIME TO OFFER

DECORATIVE CONCRETE FLATWORK

Start on the right path with training, guidance, and certification.

SPECIAL REPORT WWW.FORCONSTRUCTIONPROS.COM/CONCRETE

CONC1221_01_Cover.indd 1

Winners of the BEST Contractors to Work For in Construction

12/2/21 8:27 AM

CONC1221_02-3_TOC.indd 2

11/30/21 10:13 AM

WHAT’S INSIDE

DECEMBER 2021 | Issue 7, Volume 21

COVER STORY 20 It’s a Terrific Time to Offer Decorative Concrete Flatwork The training, guidance, and certification programs on decorative concrete flatwork.

DEPARTMENTS 4 Editor’s Letter 6 New Products 28 Product Focus

Cordless Power Tools

Cover Photo Credit: Formerly a U.S. Post Office facility, The Reserve in Playa Vista, Calif., is a 20-acre office campus that features sand-textured and seeded aggregate concrete paving, steps and walls at courtyards, plazas and walks. Work done by Trademark Concrete Systems.

43 Idea File 49 Advertiser Index 50 The Last Placement

Photo Credit: Trademark Concrete Systems

FEATURES

Decorative Concrete

Foundations & Walls

24 How I Make Concrete Marble

10 Decorative & Structural

36 A Pool of Volunteer Work

8

5 Best Practices to Optimize Concrete Form Lifespan

Two case studies featuring unique situations and an attractive hardscape.

Flatwork/Slabs

16 What to Know About Ground Penetrating Radar 22 World of Concrete 2022 Preview Find these products at the show!

Concrete Pavement

30 Highway Repair With Rapid Strength Concrete?

www.ForConstructionPros.com/Concrete

CONC1221_02-3_TOC.indd 3

How Coomes Custom Concrete Creations creates a marbling effect with concrete.

Volunteers from ASCC’s DCC & MAC traveled to Detroit to complete a community project for the Durfee Innovation Society.

38 Design By Team: Residence Hall Architects Connect with University Students

WHAT’S ONLINE Cold Concrete: Plan, Pour, Protect & Place Download this free whitepaper.

ForConstructionPros.com/ 21796767

Special Report

34 Unveiling the BEST Contractors to Work for in Construction

40 How to Prevent Coating Defects Caused by Concrete Outgassing 42 Proper Preparation Essential to Successful Floor Renovation

Calling Contractors Interested in writing a “how to” piece?

Have a story you would like to share?

Reach out and tell us your ideas!

Email Us: jkozlowski@acbusinessmedia.com

DECEMBER 2021

CONCRETE CONTRACTOR 3

11/30/21 10:14 AM

EDITOR’S LETTER

Ask vs. Need

Published by AC Business Media

How do you handle a homeowner that doesn’t know how to get what they want?

201 N. Main Street, 5th Fl., Fort Atkinson, WI 53538 (800) 538-5544 • www.ACBusinessMedia.com

T

www.ForConstructionPros.com/Concrete

here’s a mostly finished basement in my parent’s empty nest of a home. We live in Wisconsin, and I realize that “basement” might mean a few different things around the country. Let me clarify. If an elevator considered ground-level as G, there’s a bare concrete floor on the LL floor; think cellar. Picture a man-cave with JONATHAN KOZLOWSKI, EDITOR a carpet that transitions to a sea of gray concrete.

JKOZLOWSKI@ ACBUSINESSMEDIA.COM They are early in the process of figuring out a decorative topping and are currently investigating, getting estimates, and trying to figure out plans. While they know what they want as a result (a marbled effect, not flakes), what they don’t know is how to get there.

It has been educational so far and since we’re featuring decorative concrete this issue, it’s this space where I’d like to comment. One contractor quoted an epoxy floor noting that the product-which-shall-not-be-named could become scratched. The solution would provide the marbled floor effect requested but the situation left me wondering if that was what they asked for or if that was what was needed.

A lot of truth can be found within the “that’s what they asked for” statement. But in the situation where owners are also hoping entrusting you to act as a designer because they aren’t experts in decorative concrete, there are also buckets of honesty poured in the “treat every job as it’s your own home” mentality.

So, what can you do? From what I can tell, one of the most helpful things that should benefit yourself and the project is to ask questions. I spoke with Paul Wuennenberg, principal at KWK Architects regarding the dedicated work they do in engaging as many users as possible as well as the owners in university constructions. Where they actively engage students to better understand how the space will be used once built (although I do understand that a decorative floor is a different situation), that communication became vital to the design—sometimes even adjusting a bit of the structural plans as well.

That communication can become a two-way street. Many may likely not be familiar with the options concrete can offer such as today’s efforts towards sustainability or the lower-carbon alternatives they may have not considered.

Here’s to a brand-new year! See you in 2022…see you at World of Concrete! Stop by and say hi. You can find us at Booth W2019.

Stay safe out there.

Instagram.com/ ConcreteContractor

Facebook.com/ ConcreteContractor

Twitter.com/ ConcreteInsider

Advisory Board Kim Basham KB Engineering Cheyenne, Wyo.

Jim Cuviello Cuviello Concrete Polished | Stained | Crafted Stevensville, Md.

James Baty II Concrete Foundations Association Mt. Vernon, Iowa

Chris Klemaske T.B. Penick & Sons, Inc. San Diego, Calif.

4 CONCRETE CONTRACTOR

CONC1221_04-5_Editor.indd 4

DECEMBER 2021

PUBLICATION STAFF

Editor Contributing Writers Senior Production Manager Art Director Audience Development Manager ADVERTISING SALES (800) 538-5544

jsison@ACBusinessMedia.com nlawson@ACBusinessMedia.com sdunphy@ACBusinessMedia.com tsoma@ACBusinessMedia.com

Jon Sison Nikki Lawson Sean Dunphy Tadashi Soma FORCONSTRUCTIONPROS.COM

Wayne Grayson wgrayson@ACBusinessMedia.com Larry Stewart lstewart@ACBusinessMedia.com

Editor-in-Chief Editor 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 Bart Piccirillo, Sr. Account Manager, Data Axle, Phone: (518) 339-4511 Email: bart.piccirillo@infogroup.com AC BUSINESS MEDIA

Chief Executive Officer Chief Financial Officer Chief Digital Officer Chief Revenue Officer VP Audience Development Director, Demand Generation & Education Vice President, Operations Group Content Director

Ron Spink JoAnn Breuchel Kris Heineman Amy Schwandt Ronda Hughes Jim Bagan Nick Raether Jon Minnick

Published and copyrighted 2021 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, 5th Fl., 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 DECEMBER 2021, Issue 7, Volume 21 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.

LinkedIn.com/company/ Concrete-Contractor-Magazine

Dennis Purinton Purinton Builders, Inc. East Granby, Conn.

Jonathan Kozlowski jkozlowski@ACBusinessMedia.com Kim Basham, Jim Baty, Brad Humphrey, Sean O’Keefe, Chad White Cindy Rusch April Van Etten Angela Franks

O

Printed in the U.S.A. Concrete Contractor is the Official Media Sponsor of the CFA Foundation Company Certification Program

J avai ®

www.ForConstructionPros.com/Concrete

12/1/21 8:42 AM

hrey,

any form nformation

nline) is September, ., Fort WI, and or, PO Box

ountries available

ontractor,

CONC1221_04-5_Editor.indd 5

12/1/21 8:54 AM

NEW PRODUCTS

6

NEW PRODUCTS FOR THE CONCRETE CONTRACTOR

WerkMaster's RAIDER XL5 Mid-Sized Floor Grinder

WerkMaster's RAIDER XL5 is designed to maximize results and minimize the time you spend behind a machine.

Contractors can find up to 40% in labor savings on every job.

The RAIDER XL5 is a compact and powerful edger, grinder and polisher that is capable of getting to 1/8-in. of the wall.

WerkMaster's six counter-rotating heads make the XL5 an aggressive and powerful surface prep and polishing machine that is budget friendly.

It is compact and easy enough to transport, but powerful enough for the commercial contractor.

Trinic's White UHPC Powdered Additive

SupraShine Maintenance Pads by Superabrasive

Trinic white UHPC additive offers an economical alternative to producing ultra-high-performance concrete. Customers add local sand, cement & fiber to save on shipping costs and delays. UHPC made with our additive exceeds the performance of conventional high-performance concretes with very high compressive and flexural strengths, very low permeability, and excellent freeze-thaw durability.

ForConstructionPros.com/21723171

ForConstructionPros.com/21648106

SupraShine, the new generation of maintenance pads by Superabrasive, were designed to restore and upgrade any floor, delivering outstanding results and savings. Four types of pads for all your floor care needs, from deep cleaning and restoration to daily maintenance: • SupraShine Regular — A range of pads featuring a flexible material to deep clean, upgrade, and maintain all types of coated and uncoated, hard and resilient floors. Available in grits 400, 800, 1,800, 3,500, and 8,000.

• High-Performance — Pads featuring a flexible material for daily maintenance of high traffic floors. Available in grits 800, 1,800, and 3,500.

• Heavy Duty — Featuring a tough material meant for surface preparation and to remove extreme dirt - a real problem solver in difficult cases where more cleaning power is needed.

Available in grits 220 and 400.

• Hybrids — A complete range of tools from 50 grit to 400 grit designed to restore surfaces eliminate stains, scratches and orange peel, and achieve a smooth surface.

ForConstructionPros.com/21392119

Minnich's Control Speed Concrete Vibrator

The Control Speed Vibrator (CSV) from Minnich Manufacturing is a lightweight, durable, electric flex shaft concrete vibrator controlled through connectivity. Using Bluetooth and the Minnich app on an iOS or Android device, operators can choose between set speeds of 6,000, 8,000, 10,500, and open VPM. Choosing slower vibration speeds lessens material separation and reduces surface blemishes and repairs. Once a speed is chosen, the CSV will maintain that speed as the concrete load changes. The 15-amp (115-volt) universal motor drives a full line of Minnich shafts and heads and comes standard with a quick disconnect that adapts to the vibrators of many manufacturers. The CSV has been designed with a soft start that saves energy and mechanical wear on the motor and power system.

ForConstructionPros.com/21710799

LumiNode Plus Concrete Sensing Solution

by AOMS Technolgies

As part of their LumiCon Smart Construction Platform product suite, the LumiNode Plus concrete sensing solution by AOMS Technologies is an advanced wireless sensing solution that offers direct cloud connectivity, enabling instant streaming of concrete temperature and maturity data directly to the cloud without the need for extra devices such as network gateways, repeaters, or signal boosters. These advancements significantly reduce the capital cost of concrete monitoring and enhance reliability for cloud connectivity.

Easy to install without any changes in the site workflow, LumiNode Plus pairs with embedded high-accuracy multi-point sensing cables, with customization enabling horizontal and vertical temperature monitoring regardless of the depth or complexity of concrete pours.

ForConstructionPros.com/21627359

6 CONCRETE CONTRACTOR

CONC1221_06-7_NewProducts.indd 6

DECEMBER 2021

ToughBuilt's Five-Blade Utility Knife

TOUGHBUILT's five-blade utility knife multitool can switch between scraper mode to remove paint, putty, adhesive on the surface, remove labels from windows, mirrors, tiles, and more; or in a utility knife mode features a rugged handle made from metal. The blade is 2.2-in. long with a 6-in. handle.

The handles and blade are made from tripleinjected plastic and steel, respectively.

• Patented switch mechanism quickly flips between utility knife and scraper with the flick of a thumb • Rubber comfort grips • Paint can opener • Carry loop • Smooth blade ForConstructionPros.com/21648244

www.ForConstructionPros.com/Concrete

11/30/21 11:29 AM

CONC1221_06-7_NewProducts.indd 7

11/30/21 11:29 AM

FOUNDATIONS & WALLS

»

BY WARREN HAMRICK

5 Best Practices to Optimize Concrete Form Lifespan

APAtrademarked concrete form panels can be used repeatedly with proper care.

APA - The Engineered Wood Association

D

id you know concrete formwork represents close to half the cost of a concrete structure? With proper care and maintenance, APA-trademarked concrete form panels provide reliable and consistent performance. Ensure you are getting the most out of your concrete forms—and your budget—with these simple panel care recommendations.

1. Stripping: Metal bars or pry bars should not be used on plywood because they will damage the panel surface and edge. Use wood wedges, tapping gradually when necessary.

Plywood’s strength, lightweight, and large panel size helps reduce stripping time and the cross-laminated construction resists edge splitting.

2. Cleaning & Release Agent Application: Soon after removal, plywood forms should be inspected for wear, cleaned, repaired, spot primed, refinished, and lightly treated with a form-release agent before reusing.

3. Handling & Storage: Care should be exercised to prevent panel chipping, denting, and corner damage during handling. Panels should never be dropped. The forms should be carefully piled flat, face-to-face and back-to-back, for hauling. Forms should be cleaned immediately after stripping and can be solid-stacked or stacked in small packages, with faces together. This slows the drying rate and minimizes face

8 CONCRETE CONTRACTOR

DECEMBER 2021

CONC1221_08-9_FoundationsOptimize.indd 8

checking. Plywood stack handling equipment and small trailers for hauling and storing panels between jobs will minimize handling time and damage possibilities. During storage, the stacks of plywood panels should be kept out of the sun and rain or covered loosely to allow air circulation without heat build-up.

4. Coating & Agents: Protective sealant coatings and release agents for plywood increase form life and aid in stripping. “Mill-oiled” plyform panels may require only a light coating of release agent between uses.

Specifications should be checked before using any release agent on the forms. Plywood form coatings, such as lacquers, resin or plastic base compounds, and similar field coatings sometimes are used to form a hard, dry, water-resistant film on plywood forms. In most cases, the need for the application of release agents between pours is reduced by the field-applied coatings.

5. Effect of Admixtures on Forming Panels: Admixtures are chemicals added to a concrete mix to change the properties of a basic mix of cement, water, and aggregate. They can speed or retard setting times, increase workability, increase air content, decrease water permeability or increase strength among other effects. Admixtures include pozzolans such as silica fume, blast-furnace slag, and fly ash. The use of admixtures is relatively common and many of these additives increase the abrasiveness and/or alkalinity of the concrete.

While wood and phenolic overlays are resistant to alkaline solutions and abrasion, the use of admixtures may significantly decrease the “normal” life of a concrete-forming panel.

FREQUENTLY ASKED QUESTIONS What’s the biggest difference between APA-trademarked concrete forming panels over imported?

APA-trademarked concrete form panels are manufactured to product standards (such as Voluntary Product Standard PS 1, Structural Plywood, and Voluntary Product Standard PS 2, Performance Standard for Wood Structural Panels) and are subject to APA’s quality verification and testing programs.

Many imported forming panels do not undergo comparable product qualification testing. Without such tests, it’s impossible to determine how the panel will perform for the intended use.

Where do I find APA-trademarked concrete forming panels? Find a list of members at www.performancepanels.com.

What is O & ES or OES? Oiled and Edge-Sealed. Surfaces of concrete form panels are lightly coated with oil and the edges sealed if specified.

How many pours can I get out of a sheet of concrete forming plywood? Many factors affect the number of pours expected from a sheet of concrete forming plywood, including the expected finish on the concrete, the overlay (if any), the concrete mix, maintenance, and care.

Up to 10 pours can be expected from a B-B grade non-overlaid panel. With reasonable care, HDO Plyform will normally produce 20-50 reuses or more.

Consult with your supplier for advice on maximizing the number of pours.

Warren Hamrick is an Engineered Wood Specialist for APA – The Engineered Wood Association.

www.ForConstructionPros.com/Concrete

11/30/21 11:41 AM

e

Strength runs in the family.

The Titen ® family of concrete and masonry anchoring solutions from Simpson Strong-Tie. Our broad range of versatile and innovative screw anchors is designed for maximum ease and efficiency — ensuring a quick, smooth installation every time. And our skilled field support teams are always available to assist on the jobsite.

To learn more about our full line of easy-to-install Titen solutions, visit go.strongtie.com/titenfamily or call (800) 999-5099. ©2021

CONC1221_08-9_FoundationsOptimize.indd 9

Simpson Strong-Tie Company Inc. TITEN21-C

11/30/21 11:41 AM

FOUNDATIONS & WALLS

»

BY MICHAEL VAUGHN

Decorative & Structural Installation took three weeks from start to finish and ran on schedule.

All roof water from the building is discharged into the permeable parking lot with little or no run-off onto the neighboring property.

Belgard Commercial

developer over $200,000 by using a permeable paver system.”

Two case studies where contractors overcame unique situations with end results leaving an attractive hardscape.

CASE STUDY 1. LIKE WATER THROUGH A PARKING LOT Located in the expansive Novant Cotswold Medical district on Randolph Rd. in Charlotte, N.C., a new office building designed to support a variety of medical services had some special considerations for their new parking lot: stormwater runoff on a space-limited site. The design plan needed to comply with stormwater quality and storage regulations, with sensitivity to businesses on the lower side of the property, as well as a residential neighborhood behind the building.

The medical building site is a corner lot with a busy street in front, a street on one side, another business on the other lower side, and houses behind it.

Because the building does not have a lot of property, the question became how to best manage stormwater runoff and meet stormwater storage requirements.

MPV Properties, the developer, met with the design engineers and contractors to find the best method to manage

10 CONCRETE CONTRACTOR

DECEMBER 2021

CONC1221_10-15_FoundationsCaseStudies.indd 10

stormwater runoff with the least impact on surrounding properties and residents.

According to Kevin Caldwell, President of GeoScience Group, a 40-person engineering and design firm, the property layout did not have the space needed for a typical underground detention system. They initially looked at a subsurface sand filter and vault system, but there was little elevation difference between the parking surface and the outfall. The vault detention system could not go very deep and would therefore not only require a larger footprint but would also increase the heights of the retaining walls surrounding the parking lot incurring increased costs.

“We were looking for a more costeffective solution that could work just as efficiently as a large underground detention system,” says Caldwell. After conferring with Belgard’s commercial engineering team, he found the best option was to use permeable interlocking concrete pavers (PICP), although the developer was not familiar with them and was concerned about structural capacity and suitability of the surface for people accessing a medical building.

“After providing a number of examples of similar projects where permeable pavers had been used, we moved ahead with the Belgard team, relying on their design and engineering knowledge of PICP systems. Overall, we saved the

FROM CONCEPT TO DESIGN The Cotswold district medical building was the first project for GeoScience engineers using a PICP system to meet both quantity and quality objectives for the City of Charlotte. Paul Cureton, P.E. of Belgard’s commercial engineering team provided a permeable paver concept demonstrating how the system would meet the needs of the project, and several rounds of comments and suggestions on the design plans. The resulting project has 44,000 sq. ft. of Belgard Aqualine 80 mm 4.5-in. by 9-in. permeable pavers mechanically installed in a herringbone pattern by Unit Paving of Charlotte. The color chosen was Fossil.

Cureton and his team provided valuable practical guidance on how to optimize the permeable pavement design.

A typical underground detention system would require excavation of 6 to 8-ft. with catch basins and storm drains on the low end of it, according

www.ForConstructionPros.com/Concrete

11/30/21 12:03 PM

to Caldwell, with the water piped into the system. “From a design perspective, the parking lot slopes from one side to another and drops about 3 ft. on the low side, then you have 24 inches of stone and an overlay of asphalt. But if you don’t slope it properly, it can be like a bathtub.”

Cureton concurs that PICP is a lowimpact, green infrastructure solution that can also provide significant savings over the cost of underground treatment and detention systems. “Eliminating the cost of underground systems and the associated collection and conveyance system of inlets and pipes are a huge driver for using PICP systems,” he says.

HOW THE SYSTEM WORKS The Belgard permeable paver system meets the city and state’s water quality treatment objectives and the combination of storage with an appropriately designed outlet control structure meets the city’s peak flow release rate requirements. “It’s also aesthetically nicer to have pavers as the driving surface.”

The system’s ingenuity starts when water infiltrates through the paver surface. That’s where the required water treatment occurs as it filters through the aggregate between the pavers meeting the requirements for a primary Stormwater Control Measure (SCM) in North Carolina. Storage is then provided in the void space in the open-graded aggregate layers. The void space between the individual rocks and the thickness of the stone layer is the key to providing

sufficient storage, slowing and protecting the downstream properties from increased peak flows. “Post-development release rates and pre-development have to equal out–the peak flows can’t be increased,” says Caldwell. “In fact, PICP systems’ release rates may even be even less than pre-development rates, with some soil infiltration.”

The storage element of the PICP system is also what Caldwell describes as a series of cells formed by subsurface flow dams or baffles made of strips of a vertically oriented impermeable liner.

The flow dams maximize the available storage in the open-graded aggregate layers. The cell is multi-stage using a small hole (orifice) in the center of the baffle for low flows and the top of the baffle as a weir for larger flows. The cells act as separate storage units with water flowing downhill, one to the next, to manage the rate of flow. In a rare event storm, it will go over the top, however, Caldwell designed it so that it has enough storage to drain slowly from one to the other, finally discharging what is stored.

Caldwell says the water detained is about the same for both systems, but the PICP system is controlled by an outlet control structure based on the volume of the storm: in small storms, a small amount is released and the rest is stored; in bigger storms, more water can be discharged. Acceptable pre-and postdevelopment release rates are determined based on an area’s runoff potential before and after development, and in this case, the site could not increase runoff for the 10- and 25-year design storms.

QUALITY WORK In addition, the PICP system performs a dual role providing both detention and water quality. The underground detention system required an expensive sand filter to meet the water quality

GeoScience Group used a PaverMAX VM-301 machine to make short work of the placement.

Belgard Commercial

www.ForConstructionPros.com/Concrete

CONC1221_10-15_FoundationsCaseStudies.indd 11

“Overall, we saved

Belgard Commercial

the developer over $200,000 by using a permeable paver system.”

-Kevin Caldwell, president of GeoScience Group requirements. For permeable paver systems, the stormwater is filtered at the surface, and sediment is removed and collected in the aggregate-filled joints, which is why permeable paver systems are easy and inexpensive to maintain. The joint material can then be vacuumed out and replaced to restore the system. Conveyance of stormwater occurs through the voids in the stone eliminating the need for most of the piping associated with conventional stormwater systems. “There is no need for additional water treatment with PICP,” says Caldwell. “A bonus of the paver system is a nicer look, with a more upscale aesthetic that holds up very well to harsh conditions.”

Once the excavation and PICP bedding layers and stone were installed for the parking lot by Unit Paving of Charlotte, the crew began to lay the 44,000 sq. ft. of Belgard Aqualine pavers. Scott Michaud, the owner, says his crew mechanically laid the pavers with a Probst PaverMAX VM-301 machine.

“The Aqualine pavers have the consistency and reliability we look for in a project this size,” says Michaud. “The

DECEMBER 2021

CONCRETE CONTRACTOR 11

11/30/21 12:03 PM

FOUNDATIONS & WALLS CONTINUED Many walls reached up to 49 ft. tall and 1,000 ft. long.

Belgard Commercial

aesthetics are achieved at less cost and it lends a more upscale look to the entire property. We also had great support from Belgard’s engineering team.

“This was our first mechanically installed parking lot in the Charlotte area,” notes Michaud, “which not only saved time, it saved strain on the crew, as well.” He adds that the PaverMax works very well with Belgard’s Aqualine pavers.

“I also like the color consistency of Aqualine. We were there for three weeks from start to finish, the installation was on schedule—we always look to improve timing and also finish the job in the time allotted.

“As a good community member in a neighborhood area, you don’t want to disrupt things and have water on adjacent properties,” says Michaud. “On this parking lot project, all roof water off of the building is discharged into the permeable parking lot with little or no run-off onto the neighboring property.

“Unit Paving set up a demonstration at the site and invited area developers, municipal officials, landscape architects, and engineers to see the permeable system in action. It was a big deal for us because it is the first large commercial permeable paver parking lot in Charlotte,” says Cureton.

As the interior work and outer landscaping finished up, the building has been readied for the new tenants.

“Installation

of a retaining wall system is an investment in creating more property square footage to build homes on.”

-Mike Stevenson, Geogrid Retaining Wall Systems, Inc.

12 CONCRETE CONTRACTOR

DECEMBER 2021

CONC1221_10-15_FoundationsCaseStudies.indd 12

W The end result is a nicer-looking parking lot that saved the developer significantly over a detention system in time, labor, and costs. “We had five inches of rain and passed the infiltration tests with flying colors—there was nothing leaving the discharge pipe,” says Caldwell. “This is the first permeable paver parking lot in the area and the developer is thrilled. He plans to use PICP for all future developed properties and parking lots.”

CASE STUDY 2. 931 HOMES RELY ON RETAINING WALL In 2014, California-based developers Baldwin & Sons began the design and development of a housing complex on 99 acres of land in the city of Lake Forest, at the base of the Santa Ana Mountains—it's currently about 2/3 complete.

The 931-unit development, The Oaks at Portola Hills, is comprised of seven neighborhoods of both single-family and multi-family residences. It boasts many amenities, including a location in one of the fastest-growing yet safest cities in the state, with nearby restaurants and shops and easy access to interstates. It also sits at the edge of the Limestone Whiting Ranch Wilderness Park, one of Orange County’s largest wilderness preserves.

However, developing Portola Hills required converting the site from its natural state of valleys and steep hillsides into acres of construction-ready flat pads. A variety of Belgard Diamond Pro blocks engineered by Anchor Wall Systems as well as Belgard’s Vertica

Virtual Joint (VJ) and Planter blocks were chosen to make up the expansive segmental retaining wall system that created the buildable space.

CONSTRUCTING THE RETAINING WALL To design and build the retaining wall, Baldwin & Sons chose to work with Geogrid Retaining Wall Systems, Inc., the largest segmental retaining wall installer in Southern California.

Geogrid’s owner, Mike Stevenson, has more than 28 years of experience, including pioneering some retaining wall technologies.

“Geogrid checked all the boxes in terms of the competency of their people, value-engineering, and the products they were going to use. Their previous projects and references also gave us a high comfort level,” says Jose Capati, vice president of land development for Baldwin & Sons. “They were very proactive and responsive from design stage to construction and we are happy with the result of the collaboration.”

“There’s not much flat land left in Southern California, and there is a shortage of homes in Orange County, so installation of a retaining wall system is an investment in creating more property square footage to build homes on,” explains Stevenson.

The project was broken into three phases: Portola Northwest, Portola Northeast, and Portola South. While the first two feature single-family homes, the last phase saw the construction of 313 single-family, 256 multi-family,

www.ForConstructionPros.com/Concrete

11/30/21 12:04 PM

e

Xtreme Curb and Gutter Machines

Visit with us about your 2022 project needs!

West Hall -- W2725

info@gomaco.com ❘ www.gomaco.com Long, straight runs are nice. But many of you have curb and gutter projects with short runs, radii, and corners in parking lots or tight locations. GOMACO’s Xtreme curb and gutter machines have Zero-Turn capabilities for maneuverability. You’ll be able to place more curb than ever before, move your machine in ways you have never moved before, and be able to pour a tight radius that you could only dream of before.

We will have our full line of Xtreme curb and gutter machines on display in the GOMACO booth at World of Concrete 2022. Stop by and see one in person and visit with GOMACO’s concrete slipform paving specialists about your upcoming project needs.

CONCRETE STREETS AND HIGHWAYS ❘ AIRPORT RUNWAYS ❘ CURB AND GUTTER ❘ SIDEWALKS RECREATIONAL TRAILS ❘ SAFETY BARRIER ❘ BRIDGE PARAPET ❘ BRIDGE DECKS ❘ IRRIGATION CANALS GOMACO CORPORATION IN IDA GROVE, IOWA, USA ❘ 712-364-3347

CONC1221_10-15_FoundationsCaseStudies.indd 13

12/1/21 9:04 AM

FOUNDATIONS & WALLS CONTINUED and 58 affordable housing/mixed-use dwellings. Portola North West and Portola South are completed. Phase 1 of Portola North East is substantially completed and Phase 2 is currently being worked on as well, with completion scheduled for December 2023.

Geogrid has an in-house design engineer, Matthew Merritt, P.E., of Red One Engineering, who exclusively designs the segmental retaining walls for their clients. For Portola Hills, the company designed and built walls comprising the entire perimeter of the project to develop “super pads,” acres of flat land for Baldwin to build on.

Many of these walls reached up to 49-ft. tall and 1,000 ft. long.

CHALLENGES “We were involved with each phase of the project early in the design process and that allowed us to collaborate with

the owner, civil engineer, and geotechnical engineer on incorporating the various Belgard wall products into the project,” says Merritt. Weekly project meetings with the project management and engineering team also helped avoid issues during construction.

Among the main concerns for the project initially, according to Capati, were the poor soil quality of the site and the weather. Early in the project, they started to experience landslides because there were failure planes in the soil being excavated. A failure plane is a weak clay layer that causes instability. These thin layers are like grease which, once exposed, cause landslides as dirt and rock slip over them—especially during significant rainfall. “We worked with the geotechnical engineer on the global stability analysis and incorporating the Mirafi global stability geogrids into the wall design. Portola South had a long (100 ft.+) and very

PECORA-DECK HB1000

FAST CURING, LOW-ODOR, INDUSTRIAL GRADE POLYURETHANE COATING

PROTECT YOUR INVESTMENT

SUN

n

WATER

CHEMICALS

FAST CURE ALLOWING FOR QUICKER RETURN TO SERVICE n

HIGH IMPACT AND ABRASION RESISTANCE FOR USE IN HEAVY DUTY VEHICULAR AND PEDESTRIAN AREAS

n

HIGH-MIL APPLICATION WITHOUT OFF-GASSING, BUBBLING OR SWELLING OF THE COATING UPON CURE

n

LOW-ODOR MEANS IT IS SAFE FOR INTERIOR APPLICATIONS WITH ADJACENT OCCUPIED SPACE n

n

SNOW/ICE

FIELD TINTABLE OPTIONS ARE AVAILABLE

COMPLIMENTS THE EXISTING PECORA-DECK LINE OF PRODUCTS

FOR MORE INFORMATION CONTACT YOUR PECORA SALES REPRESENTATIVE

PECORA.COM

14 CONCRETE CONTRACTOR

DECEMBER 2021

CONC1221_10-15_FoundationsCaseStudies.indd 14

strong geogrid for global stability. Portola NE had two walls incorporated into a large landslide buttress,” says Merritt.

“We also worked with a shoring contractor to incorporate the Diamond Pro block facing over the shoring elements.”

Another natural element to contend with was the fact that the project was in a seismic area. In addressing global stability, the team designed a system of secondary geogrids, placed between the standard grid layers. A grid’s length is usually equal to 100% of wall height (i.e., 40-ft. long for a 40-ft.-tall wall). At the Portola site, between every layer of the standard-length grid and compacted fill was another, smaller grid only 4-ft. long.

These strata of primary geogrid fabric, compacted fill, secondary grid, compacted fill, and so on provided the necessary additional stability in the seismic area.

There were also design requirements the team had to meet for the project, including the city’s demand that most of the walls be plantable. “For decades now, Southern California has required plantable walls so, over time, what passersby see is vegetation instead of standard concrete,” says Stevenson. Geogrid’s choice of Belgard plantable blocks gave them an advantage over the competition in the bidding process and, ultimately, gave Baldwin & Sons the maximum amount of space on which to build homes.

Belgard’s Plantable system features an 8:1 batter. “The wall batter is a ratio of vertical feet to horizontal feet, so 8:1 means for every eight feet vertical the wall slants backwards one foot. So, one foot of useable property is lost to the wall batter. The competition at 4:1 loses one foot every four feet of height, or two feet for every eight of height,” explains Merritt.

He adds, “Using the various Belgard products provided the client with an additional 66,500 sq. ft. (1.5 acres) of usable land.” Oftentimes, the difference in wall batter may truly affect the usability of the small back yards of expensive California real estate.

Geogrid designed the plantable walls to go up 4 ft., then back 6 in., then repeated that to achieve the 8:1 batter.

www.ForConstructionPros.com/Concrete

11/30/21 12:04 PM

Providing plantable space every 4 ft. high, without compromising buildable space, made it likely the vegetation would grow to cover the walls in a shorter amount of time than they would cover an 8-ft. wall. All tall walls over 6-ft. high were plantable.

“We worked with the civil engineer to incorporate the various wall batters into the grading plan and avoid conflicts with the geogrid reinforcement,” adds Merritt.

DECIDING ON A COLOR Geogrid also worked with Sierra Building Products (the manufacturer of the Diamond Pro and Vertica VJ wall products) to develop a custom color block for the project, Belgard’s Toscana blend.

The variegated block draws shades of browns and reds from the surrounding soils of the Santa Anas. While the plants were growing in, and after they suffered the effects of 2020’s drought and died

off, the color and texture of the wall offered a beautiful façade on its own.

“I have designed with Belgard wall products for over 10 years so I knew I could trust their block on such a large and critical project,” says Merritt. “We used the full line of Belgard products available to us to meet the needs of the owner and requirements of the City of Lake Forest.

The result was great looking plantable and non-plantable walls that blend into the site, provide an excellent aesthetic and most importantly provide lasting confidence in their structural capabilities.”

“The fact that Belgard offers so many complementary products that we could use both as vertical and plantable walls was a huge asset,” says Stevenson.

“We were installing more than 1,000 sq. ft. of block a day and they were always timely with manufacturing and delivery.” In total, the project utilized Belgard’s Vertica, Vertica Pro Stone Cut Virtual Joint, Diamond Pro Stone Cut,

Diamond Pro Stone Cut Virtual Joint, Vertica Cap 8-in., Vertica Cap 4-in. and Belgard Plantable Unit.

Now near completion, the Oaks at Portola Hills is a private, gated community atop a hillside offset by the beautiful, Toscana colored retaining walls. It features tree-lined streets and panoramic views. There are outdoor recreational spaces, including neighborhood parks, a five-acre public park and sports fields, and 1.5 miles of walking and hiking trails.

“Everyone is very pleased with the walls’ functionality and how they enhanced the overall aesthetics of our development,” says Capati.

Michael Vaughn is Commercial Brand Manager for Belgard Commercial/Echelon Masonry, Oldcastle APG a CRH Company.

Case study 1: ForConstructionPros. com/21415883 Case study 2: ForConstructionPros. com/21427841

OUR KIND OF PLAYGROUND

This is the natural habitat for Brokk’s compact giants.

With the perfect combination of power, operability and accessibility our demolition robots provide efficient solutions to increase profits.

M

4 c

B

See us at booth W1305

Brokk Inc. | Monroe, WA | 1-360-794-1277 | info@brokkinc.com | www.brokk.com

www.ForConstructionPros.com/Concrete

CONC1221_10-15_FoundationsCaseStudies.indd 15

DECEMBER 2021

CONCRETE CONTRACTOR 15

11/30/21 12:04 PM

FLATWORK/SLAB

»

BY MICHAEL ARVANITIS

What to Know About Ground Penetrating Radar

F p

C

oncrete coring and drilling contractors are adopting new technologies that make their day-to-day job easier and safer. A popular and effective solution is the ground-penetrating radar (GPR) that is used to locate rebars, tendons, posttension cables, and other targets inside the concrete. Using GPR not only makes the job easier but also adds value to the portfolio of services offered.

Giving your customer the option to choose between a plethora of methods is a huge advantage.

HOW GPR WORKS Most popular uses of GPR in concrete are the non-destructive testing and mapping of objects inside the concrete, such as rebars, pipes, ducts, cables, etc.—as well as infrastructure assessment for bridges, roads, and buildings.

GPR is a compact device that scans the subsurface in a non-destructive way. It can penetrate the surface from a few centimeters down, to tens or hundreds of meters, based on soil conditions and antenna characteristics.

For concrete, we typically use antennas in the range of GHz for better horizontal resolution.

GPR emits electromagnetic (EM) waves to the subsurface and calculates the time these waves need to travel through the various subsurface material and get back to the GPR receiver. This two-way travel time, along with a few other parameters such as the dielectric, provides the user an estimate of the target depth.

GPR is an extremely useful tool in a variety of applications. Most popular uses of GPR in concrete are the non-destructive testing and mapping of objects inside the concrete, such as

16 CONCRETE CONTRACTOR

DECEMBER 2021

CONC1221_16-19_FlatworkWhattoKnow.indd 16

Th PR rebars, pipes, ducts, cables, etc.—as well as infrastructure assessment for bridges, roads, and buildings. GPR users can also map live electrical cables and see down to the bottom of the slab.

Currently, two different GPR devices exist in the market: the pulsed systems and the stepped frequency GPR. Pulsed systems send tiny pulses of EM wave down to the subsurface during periodic intervals, while the stepped frequency devices are continuously sending parcels of wave at different frequencies at the same time. In the past, due to computing limitations, pulsed systems were the main choice in the market.

Despite their popularity, they have several drawbacks, like the frequency dilemma. Pulsed systems are limited by the main frequency of the antenna and thus they have specific limitations in terms of depth and resolution.

However, we are seeing a switch to the stepped frequency because due to now having the necessary computing power.

A 3D representation of rebar structure below the concrete surface.

Screening Eagle Technologies

STEPPED FREQUENCY GPR Stepped frequency is gaining popularity because, with a single device you can sweep through the complete frequency spectrum—from low-to-high frequencies, achieving superb depth clarity and resolution of even small objects at the same time.

Scanning data is collected in two ways, either in 2D, which means that you collect independent line scans over the concrete surface, or in 3D, using an area scan over a pre-configured grid.

Line scanning is performed by moving the GPR antenna across the surface and this results in targets on your screen.

Depending on the direction of your antenna in relation to these targets, you either get linear targets or hyperbolas that correspond to subsurface targets.

Based on their amplitude, reflection type, and other characteristics, you can

www.ForConstructionPros.com/Concrete

11/30/21 12:16 PM

PRO ma an

9 9 9 9 9

Wh the

PR

1.5 35 80 78

Inst

Feeling the stress with installing polymer concrete trench drains?

Then consider the labor-saving PRO-PLUS® Trench Drain System.

PRO-PLUS® is a SMC/GRP drainage channel made from glass-fiber fiber reinforced composite. It’s an innovative material that is…

9 9 9 9 9

Lightweight Extremely Strong Shatterproof Easy to install Requires less manpower

• Rebar supports molded into the channels • Bottom outlets located at every ½ meter • Nominal interior widths of 4" and 8" • Lengths of 39.4" and 19.7" • Various grate options for Load Class A-F

When comparing PRO-PLUS® trench drains to polymer concrete its strength, weight, and thermal expansion is unmatched.

PRO-PLUS® Strength

PRO-PLUS® Weight

PRO-PLUS® Thermal Expansion

1.5 times Stronger 35% greater Compressive Strength 80% greater Flexural Strength 78% greater Tensile Strength

70% Lighter

1.7 times less

Install PRO-PLUS® and experience the benefits of its labor-saving features.

CONC1221_16-19_FlatworkWhattoKnow.indd 17

800.36.JOSAM | www.josam.com

11/30/21 12:16 PM

FLATWORK/SLAB CONTINUED Stepped frequency devices use an ultrawide bandwidth to cover your needs in both depth penetration and horizontal resolution. Typically, in pulse systems a lower frequency does travel deeper into the concrete, but the resolution becomes worse. Specialized technologies are available that get to depth but without compromising the resolution of the target.

Screening Eagle Technologies

define the depth of the target, whether this is metallic or not, and see whether the target is empty or filled with liquid.

With advanced algorithms, you can see the deterioration of the rebars and also define whether you have voids inside the concrete.

X-RAY VISION INTO CONCRETE 3D data collection on the other hand takes more time but you get clear, tomographic views of the subsurface. It

is like an X-ray but without the need of having two side access to the target or any other inconveniences that the X-ray comes with. You can collect area data (3D) by defining a grid over concrete and select the spacing between the lines.

Typically, a denser grid gives you higher resolution data while sparser one gives you worse resolution, but you spend less time on the field. Using technology, contractors can visualize 3D data with augmented reality, giving a clear view of what is inside the concrete.

CAN GPR FIND ALL TARGETS? GPR can detect metallic and nonmetallic targets below the surface.

However, certain limitations exist, like the depth to target limitation. The rule of thumb is that GPR can detect almost any target if it is at least one inch (2.54 cm) in diameter and is buried at one foot (0.30 m) or shallower. For example, it may be impossible for GPR to locate a 3-in. (7.6 cm) plastic pipe at a 6-ft. (1.82 m) depth. Metallic targets are doing better with this rule.

BOOTH: W3705 Request A FREE Jobsite Demo

MAX developed the World’s First battery powered rebar tying tool in 1993. Since then, MAX rebar tying tools have revolutionized rebar tying work on a variety of jobsites all around the world.

The safety equipped TWINTIER® system is the fastest solution on the market for tying rebar.

TWINTIER® technology allows up to tie 4,000 ties per charge, while delivering just the right amount of wire for greater productivity and cost savings. Compared to hand tying, this tool can reduce the risk of musculoskeletal injuries. MAX is committed to manufacturing reliable tools that have been designed to deliver enhanced performance while making sure that users can carry out safe operations.

MAX USA Corp. • 205 Express St. Plainview, NY 11803 • U.S.A. - Phone: (800) 223-4293 • FAX: (516) 741-3272 • www.maxusacorp.com

18 CONCRETE CONTRACTOR

DECEMBER 2021

CONC1221_16-19_FlatworkWhattoKnow.indd 18

www.ForConstructionPros.com/Concrete

11/30/21 12:16 PM

for the rebar size by measuring the depth to the rebar from both in line and cross line data and the difference will give an approximate diameter. There are more accurate and easier instruments to detect the rebar size and cover which can be used in combination with GPR for a holistic approach to your concrete investigations.

ds al a o es

get.

h

A 2D GPR profile showing a series of perpendicular targets (hyperbolas) to the movement of the GPR. This shows a real scan from the Las Vegas Convention Center—most likely rebar within the concrete floor.

(for example), you can get performance, data clarity, and a good user experience.

Previous limitations on depth to target are being handled better with the SFCW technology.

Screening Eagle Technologies

DOES GPR CALCULATE THE DIAMETER OF A REBAR? GPR is not the ideal tool to calculate the rebar size. There is a technique where you can get approximate values

However, stepped frequency continuous wave (SFCW) technology, combined with powerful software on your iPad

Dr. Michael Arvanitis holds a bachelor’s in mathematics, a PhD in Geophysics and a post doc in GPR. For the last twenty years, he is actively working with GPR from different positions including sales, marketing, strategy and research and development. He currently works as the Head of Global Strategy for GPR for Screening Eagle Technologies.

For more information on rebar, visit ForConstructionPros.com/ concrete/equipment-products/ rebar-accessories-equipment.

NEED TO GET A CONCRETE REPAIR PROJECT DONE FAST? A Hydrodemolition robot can complete the job 25x faster than jackhammers.

See us with Brokk at booth W1305 Distributed by:

Brokk Inc. | Monroe, WA | 1-360-794-1277 | info@brokkinc.com | www.brokk.com

www.ForConstructionPros.com/Concrete

CONC1221_16-19_FlatworkWhattoKnow.indd 19

DECEMBER 2021

CONCRETE CONTRACTOR 19

11/30/21 12:17 PM

COVER STORY »

BY LANCE BOYER

It’s a Terrific Time to Offer

Decorative Concrete Flatwork I

t’s a great time to explore business opportunities in the decorative concrete flatwork market. Known for its strength, attractive finishes, and sustainability qualities, decorative concrete flatwork has been steadily growing in popularity. Contractors already installing concrete flatwork may find it worthwhile to get the training and certifications necessary to offer quality decorative options.

While your company’s area of expertise may align well with expanding into decorative work, it takes time and financial resources to successfully enter the market. A few drivers pushing the current decorative concrete flatwork market growth forward include: • Project owners are realizing the value of applying texture, color, stamped patterns, or top surface retarders that expose aggregates to enhance the appearance of the walking or driving surfaces on their projects.

• Leveraging concrete flatwork’s durability and various finishing options, architects and landscape architects are creating designs and applications that are in turn rapidly expanding the use of decorative concrete.

• The introduction of top surface retarders in varying depth-of-etch capabilities has resulted in the growing acceptance of natural concrete appearances over other options.

20 CONCRETE CONTRACTOR

DECEMBER 2021

CONC1221_20-21_Flatwork Decorative.indd 20

SPECIALIZED SKILLS The proper placement and finishing of decorative concrete requires specialized skills in using products and techniques that are not required for most concrete placements. Applying top surface retarders, seeding aggregates on the surface of the concrete, and decorative sawcutting are all tasks that take detailed knowledge and care to complete with satisfactory results. In addition, the concrete mix design used often depends on the type of decorative application.

First and foremost, concrete contractors will need to train their office and field personnel in those distinctive skills needed for decorative applications. Expertise in decorative concrete goes beyond knowing how to use top surface retarders, color hardeners, integral color, stamping tools, release agents, and sealers. For instance, proper joint layout and panel sizes, and the ability to create consistent color and texture are all necessary for a successful decorative concrete flatwork project.

When it comes to concrete mixes, contractors should be aware of the effects that supplementary cementitious materials, such as fly ash, have on colors as well as the proper dosage rate

ACI’s Concrete Craftsman series of educational documents includes CCS5(16) “Placing and Finishing Decorative Concrete Flatwork,” to help raise and maintain standards of quality in the decorative concrete flatwork industry.

American Concrete Institute

and type of microfibers so as not to alter concrete aesthetics.

They should know when air entrainment is needed and what types of problems they can expect to encounter when finishing concrete that is air entrained.

Understanding how to use top surface retarders for decorative concrete and when admixtures should be used is also a necessity. The list goes on.

WHERE TO GET TRAINING & GUIDANCE Many get their feet wet by attending manufacturers’ training programs that introduce using specific decorative products. However, it’s also important to look to credible industry sources for more advanced education and guidance.

Both the American Society of Concrete Contractors (ASCC) and the American

www.ForConstructionPros.com/Concrete

11/30/21 12:27 PM

A crew places colored concrete on the 18th floor of a building’s “rooftop retreat” in Los Angeles.

Trademark Concrete Systems

Concrete Institute (ACI) are positioned to help contractors in the decorative concrete market.

The Decorative Concrete Council (DCC) is a specialty council of ASCC and the only professional organization dedicated to the decorative concrete industry. DCC provides educational resources—including technical documents and mentoring—and organizes discussions, training, and networking events. Members also have access to hotlines staffed by specialists who can answer questions about decorative concrete, polished concrete, concrete construction, safety, and insurance. Being able to connect with experts and network with decorative concrete contractors, manufacturers, and other interested parties is well worth the membership.

ACI also offers expert guidance.

Many of the skills associated with decorative concrete flatwork are not presently covered in existing concrete flatwork resources and programs. ACI’s “Placing and Finishing Decorative Concrete Flatwork” publication closes the knowledge gap by providing in-depth information about the materials, equipment, and techniques required to successfully install decorative concrete flatwork.

Sometimes referred to as CCS-5(16), the educational document is one of five titles available in the ACI Concrete Craftsman series. Topics covered in this publication include: • Mixture design for decorative concrete mixtures.

• The use of integral color and dryshake color hardeners.

• The identification and uses of decorative finishing tools and equipment, such as stamping mats and stencils.

• The use of surface retarders to produce exposed aggregate surfaces.

• Stamping and texturing concrete.

• Seeding fresh concrete surfaces with decorative aggregate.

• Decorative treatments for stair treads and risers.

• Cleaning and sealing methods for decorative concrete.

The document also covers subjects that are universal to concrete flatwork construction, including jobsite and personal safety, ensuring designs adhere to Americans with Disabilities Act guidelines, preplacement site preparation and identification, and uses of concrete finishing tools.

Perhaps most important, “Placing and Finishing Decorative Concrete Flatwork” serves as source material for ACI’s Decorative Concrete Finisher certification programs.

GET CERTIFIED Recognizing the need to raise the quality of education to maintain high-level craftsmanship in the decorative concrete industry, the ACI introduced Decorative Concrete Flatwork certification to its programs in 2018. ACI's certification programs help contractors gain a competitive edge. Many local, state, national and international building codes, specifications, and agencies now, or will, require ACI-certified personnel on the jobsite. The training involved to get certified also ensures team members can consistently produce quality work, which in turn will help build your reputation in the market.

Contractors can have personnel certified as either a Decorative Concrete Flatwork Finisher or Decorative Concrete Flatwork Associate. While both certifications require individuals to complete a written exam and maintain current certifications as an appropriate ACI-Certified Concrete Flatwork Finisher or Technician, the Decorative Concrete Flatwork Finisher certification also requires 1,500 hours of work experience.

The decorative exam covers basic knowledge of proper installation and finishing procedures for decorative concrete flatwork, including: • Coloring: Applying and finishing dryshake hardeners, finishing integral color.

• Stamping: Form layout, squaring formwork, pattern layout, release agents, texturing tools, finishing for texture applications.

www.ForConstructionPros.com/Concrete

CONC1221_20-21_Flatwork Decorative.indd 21

• Exposed Finishes: seeding aggregate, finishing for top surface retarder applications, applying top surface retarders, washing the surface to expose aggregates.

• Stairs: forming, stamped finishes, exposed finishes, colored finishes.

• Cleaning/Sealing: applying curing compounds and sealers, surface preparation for sealers.

An ACI-Certified Decorative Concrete Flatwork Associate may upgrade to ACI-Certified Decorative Concrete Flatwork Finisher at any time during the five-year certification period by fulfilling the work experience requirements.

Formerly a U.S. Post Office facility, The Reserve in Playa Vista, Calif., is a 20-acre office campus that features sand-textured and seeded aggregate concrete paving, steps and walls at courtyards, plazas and walks. Work done by Trademark Concrete Systems.

Trademark Concrete Systems

The work and education required to obtain these certifications will increase the knowledge base of finishers and associates, which will benefit contractors’ quality of work as well as their bottom line. What’s more, when you ensure your team members receive the proper guidance and training from trusted industry sources, the level of their craftsmanship will continue to progress.

To find certification sessions near you, check out the ACI Certification Sessions Calendar. The online calendar is updated as new instruction and testing sessions are scheduled.

Lance Boyer is Chair for American Concrete Institute Committee C641, Decorative Concrete Finisher Certification, and CEO of Trademark Concrete Systems Inc.

DECEMBER 2021

CONCRETE CONTRACTOR 21

11/30/21 12:28 PM

Spotlight on

World of Concrete 2022 Aquajet Ecosilence 3.0 Power Pack

U.S. Saws FSB-150H Hydraulic Walk-behind Saw

The FSB 150H hydraulic walk-behind saw is suited for concrete and asphalt cutting applications such as street repair and utility work.

• Heavy-duty frame design reduces vibration for a fast, accurate cutting • Compact size makes transportation easy • No exhaust fumes suited for use with interior applications, trench cutting and restoration

Featuring an integrated auto start/stop technology aimed at saving as much as 6.6 gal. of fuel a day for a smaller carbon footprint, the re-engineered Ecosilence 3.0 is now more compact as well, with the entire self-contained system now fitting in a standard, 20-ft. shipping container. It produces less noise while in operation, making it ideal for use in urban areas with limited space and strict noise restrictions.

• Improved pumping pressure of 43,511 psi, providing ample power for hydrodemolition applications such as concrete renovation and road and bridge repair.

• The skid-mounted engine and pump are isolated and heat regulated in a sealed compartment at the front of the container.

• Measures 20 by 8 by 8.5 ft.

• Optional built-in workbench with vise • Available in several pressure and flow combinations, allowing operators to scale equipment to meet their specific needs.

ForConstructionPros.com/21173995 Booth #W1305

The Somero SRS-4 Compact Boom Laser Screed Machine

DE 110i battery-powered dust extractor is compact and easy to transport, yet powerful. This H class dust extractor is an excellent match for the DM 540i drill motor as well as other handheld equipment within the i-series 36V platform. It is equipped with a user-friendly HMI, SmartFlow that automatically adjusts the air flow while securing maximum runtime from the batteries, and high water protection enables fast and efficient decontamination.

Available early 2022.

The go-anywhere, do-anything compact boom Laser Screed Machine, the Somero SRS-4 was designed to be perfect for medium to large-sized slab on grade projects, especially in the agriculture market.

• Intelligent Steering adjusts steering angle to prevent stress and damage to components • Steering capabilities include 2 wheel, 4 wheel, and crab-style options • Kubota DH 902 T4f Diesel OR Kubota DH 972 T4f Gas/ Propane engine • Auger Head: 10 ft. (3.1 m) (5 ft. single flight auger) • Boom Length: 18 ft. (5.48 m) (wear roller boom) • Utilizes the Somero signature “soft landing” feature, making every pass efficient and on-grade • Conveniences include LED work lights, optional seat, and pressure-washer • Remote-control operation: ScanReco Remote

ForConstructionPros.com/21627895 Booth #D1200

ForConstructionPros.com/21136283 Booth #W2641

ForConstructionPros.com/21403900 Booths #C5525 AND #O30712

The Husqvarna DE 110i Battery-Powered Dust Extractor

22 CONCRETE CONTRACTOR

CONC1221_22-23_WOCProducts.indd 22

DECEMBER 2021

C G

Somero’s S-22EZ Laser Screed Machine 20-ft. telescopic boom and a choice of pivoting screed heads • Offers zero-turn drive capability with a 360 degree steering angle • Customized OASIS laser control system • Comes with a full-color LCD display with integrated diagnostics, Quick GradeSet System, automatic throttle and Programmable Quick Pass • Redesigned, EZ Clean Head reduces cleanup time and improves long-term maintenance • Options include a 12- or 14-ft. head width, roller plow, onboard pressure washer with hose reel, operator heat, spray bar and Floor Levelness System ForConstructionPros.com/21136302 •

T ( a p

•

•

•

F B

www.ForConstructionPros.com/Concrete

11/30/21 12:36 PM

Trimble’s Construction One Platform

Curb Roller Lynx Modular Roller Screed

The Lynx Screed has a modular design featuring a series of linkable screed pipes that can accommodate concrete pours in varying widths from 3-22 ft.

• Available in a package consisting of three 7-ft. pipes, or a package containing a 5-, 7- and 9-ft. pipe • Can be customized to include any 3-, 5-, 7- and 9-ft. length combination up to 22 ft.

• Pipes aligned and connected with three separate bolts and a centering ring for quick, easy installation • Setup completed by bolting drive and static heads to the assembled pipe’s ends and connecting to the electric Eel Screed or battery-powered Batt Screed ForConstructionPros.com/21508919 Booth #D420

DEWALT Tool Connect Construction Asset Gateway

The Tool Connect Construction Asset Gateway (DCE081) can be deployed in jobsite boxes, vehicles and tool cribs to automatically audit inventory and provide total jobsite visibility in Site Manager.

Trimble Construction One is a connected, cloud-based construction management platform that drives speed, efficiency and accuracy at each phase of the construction project life cycle.

• Connect data from the planning phases of a project to the project actuals for more predictable construction outcomes • More efficiently do actual project work and map that data back to the project for optimal resource utilization and cost savings • Brings financial management, business operations management, job costing, payroll and procurement together with ongoing project completion rates to ensure greater overall efficiency and project profitability ForConstructionPros.com/21722810 Booth #N2218

Milwaukee Tool MX FUEL Vibratory Screed

Launching early 2022, the Milwaukee MX FUEL Vibratory Screed delivers the power to pull a 16-ft. bar, eliminating gas headaches, and offering two hours of run-time per charge with a 12-ft. bar, the vibratory screed reduces user frustrations while meeting power requirements and exceeding runtime needs.

• MX FUEL Lithium-Ion battery • Bar Capacity: 4-16 ft.

• Vibrations Per Minute: 4,000-9,000 • Weight: 37 lbs.

• Equipment Warranty: 2 Year • Battery Warranty: 2 Year • ONE-KEY Compatible: Track and Manage • Push Button Start: Yes • Variable Speed Trigger: Yes • Kit: (1) MX FUEL Vibratory Screed (MXF381-2CP), (2) MX FUEL REDLITHIUM CP203 Battery Packs (MXFCP203), and (1) MX FUEL Charger (MXFC).

ForConstructionPros.com/21903037 Booth #O30800

Bosch's Dedicated Tuckpointing Grinder & Dust Guard

Bosch Power Tools 5-in. high-powered, high torque dedicated tuckpointing grinder with a dust guard is designed specifically for tuckpointing. It significantly boosts the power over the previous model from an 8.5-amp motor to a 13-amp motor, producing 9,300 RPM. The GWS13-52TG is engineered for high performance and improved durability with a metal guard mounting flange collar, dust protection with directed airflow, and an enclosed springloaded guard for maximum dust capture. The new model is ideal for tuckpointers for the removal of brick mortar.

• Motor is protected from dust and debris with epoxy-coated field windings and four-stage dust seals protect the gears and help ensure longer tool life • A viewing window on the dust guard makes it easy to see the cutting line ForConstructionPros.com/21648098 Booth #D1221

Astec Featuring Full-Size Plants, Interactive Virtual Experience

•

•

•

Uses Bluetooth and cellular connectivity to scan an area for inventory, providing automatic customizable audits and location data Connects the Tool Connect system to Site Manager via a pre-paid cellular connection and associated assets to GPS coordinates Internal battery designed for six months of operation per charge, or can be powered by the USB Power Cord and USB Power Brick (included)

ForConstructionPros.com/21722649 Booth #D916

www.ForConstructionPros.com/Concrete

CONC1221_22-23_WOCProducts.indd 23

Astec's three concrete brands, RexCon, CON-E-CO and BMH Systems, unite under the Astec brand while retaining their legacy in the product names. Learn about Astec’s comprehensive line of products for concrete production through a display that includes full-size plants, detailed scale models and an interactive virtual experience.

• The RexCon Mobile 12 • CON-E-CO LO-PRO Transit Mix Plants • RexCon tilt mixer • BMH Rollmaster horizontal reversing mixer Visitors can also learn more about the strategic partnership with CarbonCure Technologies whose products enable concrete producers to reduce their carbon footprint without sacrificing its quality and strength.

ForConstructionPros.com/21903326 Booth #N737

DECEMBER 2021

CONCRETE CONTRACTOR 23

11/30/21 12:37 PM

DECORATIVE CONCRETE

»

BY BRADLEY COOMES

How I Make

CONCRETE MARBLE W

hen most people think of concrete, they bring up images of sidewalks and driveways, roads, and buildings. Not the most glamorous of objects in our everyday lives, but they don’t really show off the diversity. I make decorative concrete countertops and furniture pieces, all unique works of art, all from concrete.

My favorite thing to do with concrete is to make it look like a slab of marble.

Why not just use marble? Marble is great but it is hard to find the exact pattern, the exact colors, in the exact shape you want. Finding a slab big enough to make a seamless waterfall edge countertop, matching your coloring is insanely difficult. With concrete, you can mimic the styles of marble, but manipulate it into shapes and designs you or your customer’s desire.

There are some truly breathtaking examples out there, I continue to be amazed at pieces my contemporaries are putting out. I learned how to make concrete this way at the Concrete Design School (CDS), with this specific

24 CONCRETE CONTRACTOR

CONC1221_24-27_CoverStory.indd 24

DECEMBER 2021

technique taught by Dusty Baker, and using his Dusty powder. This Dusty-crete technique is very simple to understand, but the potential is limitless. Finding the right balance and flow of the powder is an art form.

MIXTURE My mixture is constantly changing, no two pieces use the same exact mix design. Every piece I do has different design limitations and challenges. I use Buddy Rhodes ECC Admixture, the finest sand you can find (I use mason sand from a local quarry; it’s not the finest but the locals love having a local product like that), white portland cement, and then low doses of PVA RECS 15 fibers, acrylic fibers, silica fume, plasticizer, and pigment if needed.

The admixture and fibers are the very last things I add to the mix, in that order. They both tend to bind the mixer up, so slowly adding them to the end helps to prevent that. The mix should have the consistency of taffy, you don’t

That's not marble, that's concrete.

Bradley Coomes

want it super fluid. Yet, it should be able to move around the form to make natural-looking veins. You also don’t want it so dry that it leaves massive voids on the face of the project that you'll have to fill in later. Make sure your fibers get fully mixed in. Your mix should feel stickier than regular concrete.

DUSTING The crux of the process is how you dust the forms. Everybody has their own process, and every technique has its benefits. However you do it, you will be making something unique. I take about a half handful of powder and stand a couple of feet away from the form (you don’t need to be hovering over it).

I throw the powder towards the form, letting nature do the rest. It should be randomly scattered throughout your form. You can always add more if necessary. In the same vein, you can also blow out the form and try again.

www.ForConstructionPros.com/Concrete

11/30/21 12:40 PM

E

On bigger pieces, you will most definitely need multiple throws to achieve a pattern across the entirety of the concrete face. It is important to make sure you don’t get a big buildup of powder on the edges of the form; it ends up ruining your concrete corners.

I take a scraper and using a flick of the wrist, throw any built-up powder back into the form.

In this example (at right, top), I used sanded grout to make a marbled effect.

The Dusty-crete method uses the Dusty powder to create a nice texture. The sanded grout sucks moisture from the concrete when you cast, hardening to become a part of the face.

CASTING I fill a bucket with concrete and place it on my casting table, then take handfuls of the mix and carefully lay it over the powder. You don’t want to put so much in one place, where the concrete will roll over the powder. This is called steamrolling and causes the piece to become a bit cloudier, instead of having clear and concise marbling and veining. In this example, my mix was slightly wetter than normal, making the result show more blooms, to look like fireworks ingrained on the table.

With the mix how you would like it, place handfuls onto the powder.

Once you have a couple of continuous handfuls all touching, I like to make sure the handfuls have all joined up nicely by massaging the backs gently, so as to not disturb the powder. Continue to place handfuls and fill up your forms, making sure the edges of the forms get massaged well to prevent as many air bubbles on the sides as possible. Make sure the back of the piece is level with your forms and cover it for the day.

Lumos Images (Kansas City) | Photographer: Aaron Cedeño

POLISHING The day after casting, I carefully remove the form edges and flip the piece over.

I check to make sure everything looks “normal.” I say that because it will look nothing like the finished concrete, I just want to make sure there aren’t any massive voids or huge buildups of powder that may have caused some disfigurement on the face.

www.ForConstructionPros.com/Concrete

CONC1221_24-27_CoverStory.indd 25

Bradley Coomes

DECEMBER 2021

CONCRETE CONTRACTOR 25

11/30/21 12:41 PM

DECORATIVE CONCRETE CONTINUED Bradley Coomes

After that, I use a wet polisher with a 200-grit diamond polishing pad to clean off the top layer of concrete, sometimes called the cream. Make sure to keep the polisher even, and to keep plenty of water on the surface.

Move slowly. Once the whole face is cleaned up, you should see some smaller holes that have appeared. These are air bubbles that we couldn’t fully get out of the concrete without disturbing the powder underneath. I mix a slurry consisting of cement, sand, water, and any pigment to match your design, and rub it into all the holes on the surface.

After my first pass with slurry, I use a paint scraper to scrape the surface of excess, and it shows me any more that I may have missed. After all the holes are filled, use a damp rag to wipe the top clean of the excess.

Give it a light polish if it needs, otherwise, I mix some muriatic acid with water and scrub the surface. It is now ready for sealer.

FLIP & MOVE You spend all this time painstakingly pouring over your forms, weighing and measuring your ingredients just right, only to fumble the football and damage your piece while processing it or installing

26 CONCRETE CONTRACTOR

CONC1221_24-27_CoverStory.indd 26

DECEMBER 2021

it. Every single person I have talked to has had wildly different ideas in how to move pieces around—from carts to hiring 15 people to help—but the one singular constant in every single discussion about it has been the need for patience.

Go slow.

When I remove my forms, I don’t slam my drill around, yank my side rails or anything. I know it’s concrete and my UHPC is reading massive compressive strengths, but it doesn’t take much to get a hairline crack started or to chip a corner, especially on green concrete.

When I move a piece from my casting table to polishing dollies, I make sure there are literally no obstructions around, and that I have at least one extra person than I feel is necessary.

This extra 45 minutes spent can be a hassle, sure, but it is a whole lot better than explaining to a customer why their project needs an extra couple of weeks.

Think about your tensile strength when moving your castings. Concrete generally cracks before it bends. Instead of rebar, I use a high load of fiber.

If you find that the concrete has bonded to your form when flipping a piece out, you can slowly wedge shims underneath in an even pattern. This should eventually get the entire piece

to pop out. You should then be able to safely get underneath to flip the concrete over and begin processing the face.

This process of making concrete has completely changed my view on furniture and concrete applications in general. Like the CDS, this design process continues to change and evolve. Craftsmen around the world use this technique, or ones similar, to achieve interesting results. Every person has a different take on it, and others have found other more intriguing ways of transforming their mixtures into something never before seen.

Use this article as a jumping-off point to try different methods. If you aren’t sure where to start or feel you need some help, definitely take a class from Dusty or any of the instructors at CDS or contact the support staff at the Buddy Rhodes headquarters.

Bradley Coomes is the owner of Coomes Custom Concrete Creations. With six years of experience, two of them being in the decorative world, Bradley and his company services Eastern Kan., Western Mo., and Northwest Ark.

For more information on decorative concrete, visit ForConstructionPros.com/ concrete/decorative.

www.ForConstructionPros.com/Concrete

11/30/21 12:42 PM

s

Curb Roller Manufacturing

e

o e

CONC1221_24-27_CoverStory.indd 27

11/30/21 12:42 PM

PRODUCT FOCUS

CORDLESS POWER

Milwaukee Tool M18 FUEL Mid-torque Impact Wrenches

TOOLS Enerpac’s Cordless Bar Cutter

The battery-powered Cordless Bar Cutter is a portable, convenient and safe solution where external power is not available or where spark risk is a concern.

Cordless technology provides freedom of movement and the rotatable head can be positioned for optimal access to the application. The unit can quickly cut through up to #6 rebar and similar metals up to 0.79-in. in diameter, and can make up to 125 controlled, uniform, repeatable shear cuts on a single charge. For safety, the bar is held in place behind a protective guard and the Trigger Guard helps prevent accidental activation. The tool comes with two batteries and a charger.

ForConstructioPros.com/21403358

Milwaukee's M18 FUEL Concrete Pencil Vibrator Launching early 2022, Milwaukee Tool's M18 FUEL Concrete Pencil Vibrator offers a completely cordless compact solution when working in confined and

The Husqvarna K1 PACE Battery-powered Cut-off Saw

restricted spaces.

• Generates up to a 1.8 peak HP with 12,500 VPM • Able to consolidate up to 20 cubic yards of concrete per charge • Head Size: 1 in. Square Head • Variable Speed Trigger: Yes, 0-12,500 • Available in 4 ft. and 8 ft. versions

Husqvarna's K1 PACE high-power battery cutter was designed to handle heavy-duty jobs. The PACE battery system can be utilized for more machines as the battery-powered family expands. In addition to the power cutters and battery system, diamond blades in 12 in. and 14 in./300 and 350 mm have been optimized for battery operation. The machine is also equipped with X-Halt brake function capable of stopping the rotation of a blade in a fraction of a second for enhanced safety.

ForConstructioPros.com/21903020

ForConstructioPros.com/21508855

28 CONCRETE CONTRACTOR

CONC1221_28-29_ProductFocus.indd 28

DECEMBER 2021

The M18 FUEL mid-torque impact wrenches provide up to 650 ft.-lbs. of nutbusting torque while weighing in at only 5.1 lbs.

• POWERSTATE brushless motor generates the torque and speed needed to remove large bolts or lug nuts • REDLINK PLUS Intelligence protects tools against overloads, overheating and over-discharge • M18 REDLITHIUM battery pack ensures more work per charge and more work over the life of the pack • Four-mode DRIVE CONTROL offers a range of preset RPM and IPM levels, selectable from a single button on the tool • Tri-LEDs deliver brighter light with less shadows for increased visibility in confined and low-light workspaces ForConstructioPros.com/21197925

The Husqvarna BV 30i Battery-Powered Screed

The BV 30i battery-powered screed is cordless and lightweight, operates with low vibrations and does not emit direct exhaust fumes—proving a more pleasant, working environment.

ForConstructioPros.com/21627901

www.ForConstructionPros.com/Concrete

11/30/21 12:45 PM

Two Brushless 5 in. Cordless Orbit Sanders by Bosch

Bosch Power Tools GEX12V-5 Brushless 5 in. Random Orbit Sander and GEX18V-5 Brushless 5 in. Random Orbit Sander features brushless motors and are designed for optimal balance and convenience. Thus, allowing users to tackle hard-to-reach work areas with power, control, and precision. In addition to the ergonomic palm-grip design, each of the cordless sander models offers a compact body with a close-to-the-workpiece design for control, an easy-to-reach on/off switch for intuitive operation, and a vibration-dampening element to help minimize user fatigue.

The 5 In. 8-hole sanding pad is ideal for both flat and concave/convex surfaces, and the brushless motor delivers a high material removal rate for faster, more efficient sanding. The sanders also feature a speed selector, which allows users to achieve maximum results during usage with different materials and applications. Both models have the option of mobile dust collection.

DeWalt's POWERSTACK 20V MAX Compact Battery

DEWALT's POWERSTACK 20V MAX Compact Battery is a next-generation lithium-ion battery that was designed to provide 50% more power enabling broad application capabilities and fast performance with cordless tools.

• 25% more compact and 15% lighter than DCB203 battery • Designed to provide tool maneuverability, high precision, and reduced fatigue when used in tight workspaces • Twice the lifespan (charge cycles) providing more overall investment value

ForConstructioPros.com/21734951

Hilti’s DD 250-CA Diamond Core Drill

Hilti North America's semi-autonomous core drilling solution, the DD 250-CA diamond core drill, paired with the Cut Assist Auto Feed unit gives the operator an assisted experience by intuitively guiding the drill through the entire drilling process. The DD 250-CA diamond core drill leverages integrated technology to provide the operator guidance for proper drill setup, real-time drilling feedback, and valuable productivity data once the drilling is complete. The smart tool has an unmatched range in its class for all applications including drilling penetrations for ducts, pipes, and cables and drilling blind holes for setting anchors or post-installed rebar. With Hilti Cut Assist technology, the unit delivers greater operator safety, higher worker comfort, and less fatigue when coring drilling in difficult conditions.

In addition, the battery includes several features to optimize functionality with an LED fuel gauge that displays the battery's state-of-charge, helping the end user avoid unplanned work stoppages.

ForConstructioPros.com/21627647

ForConstructioPros.com/21772036

The Bosch PROFACTOR 18V 1/2-in. Impact Wrench

Bosch Power Tools' cordless PROFACTOR 18V 1/2 in. Impact Wrench with Friction Ring features BITURBO Brushless technology, a high-performance motor, and a drive-train system engineered to take full advantage of the additional power generated by CORE18V batteries.

• Delivers up to 740 ft. lbs. of fastening torque and 1,180 ft. lbs. of max breakaway torque • 1/2-in. friction ring allows for fast socket changes • Feature BITURBO Brushless technology • Are compatible and optimized for use with CORE18V 8.0ah PROFACTOR Performance and 12.0Ah PROFACTOR Exclusive batteries • Feature ergonomically designed soft grip for comfort and better tool handling • Offer an onboard user interface to select between three torque/speed settings by pressing the speed selector button • Provide LED light that illuminates dark work areas, turns on with tool activation and can be disabled via user interface Bosch Power Tools’ PROFACTOR line of cordless tools give professionals the freedom to take on the most demanding jobsite applications on one 18V battery platform ForConstructioPros.com/21627709

www.ForConstructionPros.com/Concrete

CONC1221_28-29_ProductFocus.indd 29

BOOTH W1250

DECEMBER 2021

CONCRETE CONTRACTOR 29

11/30/21 12:46 PM

nd ys irec-

CONCRETE PAVEMENT

»

BY MIKE DARTER

Highway Repair With Rapid Strength Concrete?

Results of a Southern California freeway surveys that set out to determine the short- and long-term performance of rapid strength concrete for the potential repair and restoration of highway infrastructure work.

D

eteriorating highway and other infrastructure conditions across the U.S., combined with widespread funding shortfalls, make it clear that there is a need for cost-effective, long-term solutions for roadway preservation. Surveys of existing projects in California have addressed this need, with results documenting pavement restoration successes and offering guidance on the practice of pavement management.

The use of rapid strength concrete (RSC) for roadway construction is extremely beneficial for today’s congested highways and the traveling public.

Because RSC reaches opening strength in a matter of hours, slab replacement can be accomplished overnight. The California Department of Transportation (Caltrans) has used RSC for pavement repair since the 1990s and is typically able to complete slab replacement— including removal of cracked slabs, repair of the base course, placing of dowel bars and interlayer, and placing and curing of RSC—within a six-hour window.

Two surveys were conducted, the first by Caltrans in 2008, the second in 2018-20 by myself. These surveys sought to confirm that in addition to offering the immediate benefit of short lane closures, RSC was providing durable, long-lasting repairs. Condition surveys conducted for “Evaluation of Rapid Strength Concrete Slab Repairs” (Bhattacharya, Zola, and Rawool, 2008) examined 15 freeway projects across six regions, looking at more than 5,000 “individual” RSC slabs and recording

30 CONCRETE CONTRACTOR

DECEMBER 2021

CONC1221_30-35_ConcretePavement.indd 30

all distress. Since the slabs were only three years old at the time of the survey, the study’s goal was to document the short-term performance of RSC. Results showed that only 1.4% of the RSC slabs surveyed showed any premature distresses.

By 2018, the time was right to assess longer-term performance. The evaluation focused on two California strategies for restoration of jointed plain concrete pavement (JPCP): • “Individual” slab replacement with rapid strength concrete (ISR-RSC); • “Total lane replacement” RSC (JPCPRSC), (“Long-Term Performance of Rapid Strength Concrete (RSC) Slabs on California Highways,” Darter, 2021).

For the six ISR-RSC “individual” replacement projects being assessed, cracked, or badly damaged JPCP slabs had been removed and replaced with RSC slabs along a traffic lane. RSC slab thickness (typically 8-9 in.) and joint spacing (typically 12-19 ft.) remained

A total of 3,562 RSC slabs were surveyed. Image by Mitzi McIntyre, CTS | Rapid Set.

the same and existing base courses had been largely left in place. In some cases, dowels had been included in the transverse joints. Neither shrinkage nor ASR requirements were specified at the time of slab replacement. Concrete durability issues, typically seen as surface cracks and scaling, were almost non-existent.

For the six JPCP-RSC “lane replacement” projects being assessed, all slabs and base courses along one or more traffic lanes had been removed and replaced with RSC. Slab thickness was typically increased during reconstruction to be 10-14 in.; perpendicular joint spacing was uniform at 14 ft.; and dowels were placed at all transverse joints. Both RSC shrinkage and ASR requirements were included in these specifications.

A survey team, working with Caltrans, randomly selected six of the 15 projects previously surveyed in 2008

www.ForConstructionPros.com/Concrete

11/30/21 12:50 PM

w

HP Concrete Cold Patch™

a it n t ai ti ns with Lasting Performance.

TechCrete™ Crafco HP Concrete Cold Patch™ is a fast, flexible concrete repair solution for when you need to get the job done quick. This convenient, ready to use, and no mixing patching compound can be used in all climates and weather conditions and its quality formula ensures performance for years.

Crafco TechCrete™ offers an industry-leading solution to wide cracks, joints, and other distresses. This hot-applied repair mastic has a strong bond, rugged durability and flexibility unmatched by any other concrete repair material. It’s proven to last — displaying service life of more than 15 years.

Nationwide sales, service, and rentals. Visit crafco.com/sales t

s

t L a n

at crafco.com

crafco.com

CONC1221_30-35_ConcretePavement.indd 31

11/30/21 12:50 PM

CONCRETE PAVEMENT CONTINUED CTS Rapid Set cement allowed slabs to be placed during the night to limit lane closures.

Image by Mitzi McIntyre, CTS | Rapid Set

(all ISR-RSC) to be part of a similar 2018 study. Located in southern Calif., the now 13-year-old RSC slabs had experienced on average truck traffic levels of 6 million total trucks in the inner lane and 20 million total trucks in the outer lane. A total of 1,493 ISRRSC slabs were surveyed.

An additional six projects were randomly selected to represent JPCP-RSC “lane replacement” pavements. Because only panels located in outer lanes with heavy truck traffic (16 million trucks total) had been replaced, only JPCPRSC slabs in outer lanes were included in the survey. These 2,069 RSC slabs had been in service from 9-17 years.

A total of 3,562 RSC slabs, located across 18 inner and outer traffic lanes on 12 major freeways that were twoto five lanes in each direction were surveyed. Distresses examined included transverse cracking, longitudinal cracking, corner cracking, joint spalling, shrinkage cracking, surface defects, joint faulting observations, and pumping/erosion.

32 CONCRETE CONTRACTOR

DECEMBER 2021

CONC1221_30-35_ConcretePavement.indd 32

MATERIALS USED & RESULTS Rapid Set cement, manufactured by CTS Cement, was used for the majority of the original slab replacements. Rapid Set cement is a non-proprietary belitic calcium sulfoaluminate cement that reaches opening strength (400 psi flex) in 1.5 hours. It is very low shrinkage and is resistant to sulfate attack and alkali-silica reaction. Rapid Set cement can be used in a volumetric mixer or ready mixer. For a few projects, the 4x4 Concrete System was used. This proprietary system, originally patented

by BASF and now offered by multiple admixture suppliers, offers opening strength (400 psi flex) in four hours but can experience higher shrinkage than Rapid Set cement if a high dosage of shrinkage-reducing admixture (SRA) is not used. It cannot be used in volumetric mixers and is appropriate for ready-mix delivery only.

ISR-RSC survey results for the “individual” slab replacements of six projects were consistent with findings from 2008: very low distress development, with one exception. Of the slabs in the outer lane, 20% had developed transverse fatigue cracks—the only significant cracking experienced across all 12 projects. Transverse cracks are the commonly seen top-down fatigue cracks caused by heavy trucks moving over the upward curled slabs and applying axle loads that cause high tensile stress in the top of the saucer-shaped slab caused by moisture and temperature gradients.

Transverse fatigue cracks were predominantly located in the outer lanes, where truck traffic was heaviest. Inner lanes were found to crack at a rate of only 3%, though they carried 6 million trucks, whereas the outer lanes developed 21% carrying 16 million trucks. The survey showed only minor occurrences.

It is estimated that outer lane ISRRSC individual, thin slabs have service lives of 10-13 years and inner lanes

with less truck traffic in the order of 15-20 years with the same thin slabs. The individual slab replacement appears to be a viable repair solution for lower truck traffic inner lanes, or as a short-term strategy for outer lanes.

Dowel bar use at all transverse joints is recommended to prevent pumping and faulting. Replacement of the entire lane, using a closer joint spacing of 14 ft. and thicker slabs, as well as installing dowel bars at all transverse joints and providing a new base, is considered to be the most long-lived reconstruction solution.

Using these construction guidelines, appropriately designed RSC pavements should achieve at least 30 years of service (based on the limited distress seen in lane replacement RSC slabs at the approximately 17-year mark). Inner lanes that experience less truck traffic are expected to last at least 30 years.

Diamond grinding should be performed to achieve pavement smoothness after RSC slab replacement as needed.

“With the increasing demand that highway work be completed overnight in order to minimize impact on the traveling public and decrease emissions from traffic congestion, it’s great to receive validation that pavement management with RSC is a long term solution for our nationwide highway infrastructure,” says Ken Vallens, President and CEO of CTS Cement Manufacturing Corporation.

To date, Caltrans has not specified durability criteria for shrinkage and ASR for slab replacement work, because it has typically been considered a shortterm (approximately five-year) solution.

However, with survey results showing that slab replacement using RSC can be a long-term pavement reconstruction option, it is the belief of the survey team that durability criteria should now be included.

T

Beca to be with Agre with This done

Lear

Mike Darter is a professor emeritus of civil and environmental engineering at the University of Illinois.

Adapted from a IGGA Technical Session: ForConstructionPros. com/21451755.

www.ForConstructionPros.com/Concrete

11/30/21 12:50 PM

*Offer v machine (except compac planned addition without

© 2021 product

0% FOR 60 MONTHS Plus a CAT CVA ®

*

Take Advantage Of One Of This Year’s Best Offers

Low interest rates + Cat CVA + First-in-class service and support = The right time to call your Northeast Cat Dealer.

RONG ST ST A E H MILTON CAT

H.O. PENN

D CLEVELAN S INC. BROTHER FOLEY,

TIO N S

MILTON CAT

OCA

®

NOR T

Because your business never stops, we want owning new Cat compact equipment to be simple and hassle-free. Right now, you can take advantage of low interest rates with unmatched support from your local Cat dealer. Plus, with a Cat Customer Value Agreement, you get 3-year comprehensive coverage and up to 50% longer component life with the use of genuine Cat parts that are conveniently provided for planned maintenance.

This finance rate can also be applied to attachment purchases, helping you get even more done for less.

5 3 C O N V E NIE N

TL

Learn more at NECatDealers.com/finance.

Since 1923

SINCE 1948 Cleveland Brothers

SINCE 1957 Foley, Incorporated

SINCE 1923 H.O. Penn Machinery

SINCE 1960 Milton CAT

Serving Pennsylvania and northern West Virginia

Serving New Jersey, eastern Pennsylvania, northern Delaware and Staten Island

Serving Connecticut and southern New York

Serving Massachusetts, Maine, New Hampshire, Vermont, Rhode Island, and Upstate New York

www.clevelandbrothers.com

www.foleyinc.com

844-720-4CAT

732-885-5555

www.hopenn.com 844-CAT-1923

www.miltoncat.com

866-385-8538

*Offer valid from August 1, 2021 through December 31, 2021 on new small and compact Cat machines sold or leased by participating Cat dealers. Purchase or lease must occur during offer period. Offer subject to machine availability and credit approval by Cat Financial. Not all customers will qualify. Payments based on 60-month lease or loan. The offered Cat Customer Value Agreement (CVA) includes 3 maintenance parts kits (exception: small wheel loader includes 6 kits); TA1 equipment inspection; Product Link ; and a 3-year/3,000-hour Powertrain, Hydraulics and Technology Equipment Protection Plan (EPP); and final drive oil only for compact track loaders and mini excavators. The maintenance parts cover the first 1,500 hours (estimated 3 years, 3,000 hours for small wheel loader) of machine utilization. The kit contains one set of parts for regular planned maintenance under normal operating conditions. In some severe applications where maintenance parts need to be replaced more frequently, additional parts will be at customer’s expense. Offer excludes additional maintenance parts, dealer labor, wear parts, S·O·S and fluids. Payments do not include taxes, freight, set-up, delivery, document fees, inspections, additional options or attachments. Offer may change without prior notice and cannot be combined with any other offers. Additional terms and conditions may apply. Contact your Cat dealer for details. ®

TM

SM

© 2021 Caterpillar. All Rights Reserved. CAT, CATERPILLAR, LET’S DO THE WORK, their respective logos,“Caterpillar Corporate Yellow,” the “Power Edge” and Cat “Modern Hex” trade dress, as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission. www.cat.com / www.caterpillar.com

CONC1221_33A_Caterpillar.indd 1

11/30/21 12:52 PM

Unveiling the BEST Contractors to Work for in Construction There may be no better time than now to be considered a top employer in the construction industry.

Currently, the construction companies that are offering a positive workplace environment, good pay, training and opportunities for advancement are the ones that are winning the workforce shortage. The past year presented an enormous challenge for construction companies, and any employer who was able to retain and attract happy employees deserves credit.

To recognize those companies, the staff of Equipment Today, Asphalt Contractor, Concrete Contractor, ForConstructionPros.com and Pavement Maintenance & Reconstruction hosted the inaugural Best Contractors to Work For recognition program, where employees were able to nominate their employers for recognition by filling out a survey.

To be considered, employers needed to register, and employees filled out surveys about what it’s like to work for their boss. Entry forms and surveys were handled by the Best Companies Group, which analyzed the data and created an insights report based on the results.

To be eligible, construction companies must have 15 full- or part-time employees working in the U.S. The company’s primary business activity must be either general building construction, earthmoving, paving, concrete, or specialty and trades, such as underground, utility, electrical, HVAC, demolition and others.

Want to be considered for the 2022 Best Contractors to Work For? Please contact Cathy Somers at: CSomers@ACBusinessMedia.com

CONC1221_30-35_ConcretePavement.indd 34

11/30/21 12:50 PM

s

After a few months of tallying and analysis, the results are in.

Here are the 2021 Best Contractors to Work for in Construction: Winners include, in alphabetical order (company name, number of employees, headquarters): A&A Paving Contractors, 19, Roselle, Ill.; Ajax Paving Industries of Florida LLC, 430, North Venice, Fla.;

Falcone Crawl Space & Structural Repair, 43, Charlotte, N.C.; Fessler & Bowman, Inc., 746, Charlotte, N.C.;

Alpha Structural, Inc., 120, Sunland, Calif.;

The Garrett Companies, 130, Greenwood, Ind.;

Builders Asphalt and Builders Paving, 39, Hillside, Ill.;

K&L Industries, 27, Canby, Ore.;

Connolly Brothers Inc., 32, Beverly, Mass.; CSI 3000, Inc., 28, Cicero, Ill.;

Langston Construction Co. of Piedmont, LLC, 85, Piedmont, S.C.;

Dowdle Construction Group, LLC, 31, Nashville, Tenn.;

Mashburn Construction Company, 89, Columbia, S.C.;

McCrory Construction, 87, Columbia, S.C.; MSI General Corporation, 48, Oconomowoc, Wis.; Stronghold Engineering, Inc., 211, Perris, Calif.; United Contractor Services, 54, Kennesaw, Ga.; Vesta Foundation Solutions, 41, Oklahoma City, Okla.; Walsh Construction Co., 229, Portland, Ore.;

Please join us in congratulating these leading employers!

CONC1221_30-35_ConcretePavement.indd 35

11/30/21 12:51 PM

DECORATIVE CONCRETE

»

BY JONATHAN KOZLOWSKI

A Pool of Volunteer Work

S

et near central Detroit, Mich., the former Durfee ElementaryMiddle School fell to disrepair.

Instead of deconstruction, Life Remodeled began renovation and repurposed the building in 2017 to what is now known as the Durfee Innovation Society.

A part of that renovation was dealing with the school's pool. Determined too costly to maintain they filled it, leaving space on top, roughly two steps down.

Four years later, in March 2021, volunteers from the Decorative Concrete Council (DCC) and the Manufacturers’ Advisory Council (MAC) of the American Society of Concrete Contractors (ASCC) stepped in to offer their time and effort towards the community project—creating a splash with their expertise and artistic solution to what was once a bare-concrete space, now appropriately named "The Dive."

Led by CEO and founder Chris Lambert, Life Remodeled is a 501(C) (3) non-profit organization. The Durfee Innovation Society exists to create substantial and impactful opportunities for the people of Detroit.

'THE DIVE' Paul Albanelli, president of Albanelli Cement Contractors, Livonia, Mich. was the project manager for the installation. The project scope was to apply a four-color metallic epoxy coating to resemble water, to a concrete slab in an old pool that had been filled in, with special effects on steps and a ramp.

Additional steps were added to allow additional access to the space, the ramp acts as a beach completing the ocean view illusion.

Albanelli arrived on site early that week to address and repair any cracks in the surface, using a solution donated

by Roadware and the Euco Qwikstitch

36 CONCRETE CONTRACTOR

CONC1221_36-37_DecConPool.indd 36

DECEMBER 2021

rapid-setting urethane crack and spall repair donated by The Euclid Chemical Co. After grinding and polishing for 1.5 days, the surface was finally ready for the colored epoxy coating (a donation also provided by Euclid). Rick Lobdell of Concrete Mystique began creative work of designing the water, beach, and wave effects to the floor. Roughly 12 volunteers from all over the U.S. came to Detroit to help—not including all the additional support behind the scenes.

Concrete contractor volunteers state that volunteering their time gains them an opportunity to practice their craft and a chance to experience new products they've never used before. For example, Lobdell hadn't utilized the epoxy from Euclid Chemical and found it very easy to use. He says he now uses it in projects all the time.

While easy to use, as with everything in concrete construction timing is key and volunteers had to start work immediately. The unsung hero of the story may very well be the mixing volunteer on the sidelines. The blends needed to be just right to provide the illusion of depth necessary, and without bubbles, all while getting buckets out in a timely fashion. Once started, explains Lobdell, the project needs to be worked on all at once—the water, the waves, etc.—to avoid pour lines.

"This project created one of the most unique and innovative spaces within our entire building," says Lambert, "We asked community members as well as students who regularly participate in programming at the Durfee Innovation Society what they wanted to see in the former pool, and it was clear they wanted to hold on to some of the historical significance and nostalgia they felt in that space. We were so blessed to have partnered with Paul Albanelli and

Volunteers from the Decorative Concrete Council and Manufacturers’ Advisory Council of the American Society of Concrete Contractors completed an epoxy flooring project (at right) on top of the Durfee Innovation Society (at left) former pool.

Life Remodeled

the talented members of the Decorative Concrete Council to bring this vision to life."

While the DCC and ASCC look for projects to do around the country that are typically focused on helping kids and veterans. However, you don't have to wait for the call to action. They encourage you to reach out and get involved in your own community. It doesn't need to be a big project—little things can make a big difference.

Find more from the ASCC at ForConstructionPros.com/ 10071951.

Materials were donated by The Euclid Chemical Co., Increte, and H & C Decorative Concrete Products (Sherwin-Williams).

Labor was provided by Albanelli Cement Contractors, Birmingham Decorative Concrete, Leeds, Ala.; BORIDE Engineered Abrasives, Traverse City, Mich.; Concrete Marketing Crew, Parkland, Fla.; Concrete Mystique Engraving, Nashville, Tenn.; Hyde Concrete, Pasadena, M.D.; Innovative Chemical Products, Ft. Worth, Texas; Modern Concrete, East Providence, R.I.; Sundek National Accounts, Arlington, Texas; and Transhield/TopCure, Elkhart, Ind.

www.ForConstructionPros.com/Concrete

11/30/21 12:54 PM

RELENTLESS INGENUITY Backed by the industry’s best service.

CALL TODAY

CONC1221_36-37_DecConPool.indd 37

11/30/21 12:54 PM

DECORATIVE CONCRETE

»

E

BY JONATHAN KOZLOWSKI

Design By Team: Residence Hall Architects Connect with University Students

K

WK Architects’ experts say the best way that architects can improve their design standards is by speaking directly with students about their needs and wants for a space.

They claim the process is a crucial part of the process. KWK used this input from student leadership groups to design the new 53,000 sq. ft. living/learning residence hall at Augustana University in South Dakota, an L-shaped, three-story hall housing up to 200 students. A community building at the front of the hall will include shared multi-purpose spaces, and incorporate living and learning environments for faculty, students, and affinity groups. The existing building features a welcoming jewel box for a large glass pavilion at the end.

According to KWK principal Paul Wuennenberg, students can spend 70% of their time outside the classroom.

These halls are more than a place to sleep, there’s offices, learning areas, classes, lectures, etc.—an infusion between practicality and design.

This infusion continues throughout the process. A lot of nuances come into play just by a project being on-campus to consider. “On campus, it’s a little bit different than your average construction project, Wuennenberg says. “There’s a lot of pedestrian traffic. [Contractors] have to coordinate with dump trucks to make sure students are safe, routes to and from the academic core of the campus to the existing housing, when to start work and can’t do certain things on site to cause noise.” The communication and engagement with students is important.

Notifying students of safe routes and understanding that noisy work will likely not begin until after 8 a.m.

38 CONCRETE CONTRACTOR

CONC1221_38-39_DecConDesign.indd 38

DECEMBER 2021

One of the unique challenges Wuennenberg’s team had was the construction of a concrete grade beam going over an existing and operational utility tunnel beneath the building—explaining that it’s like building a bridge underground.

“We stopped the foundations on both sides of that tunnel, and then not unlike what you would see like in a parking

Designers utilized Revit for the 3D modeling and SketchUp for initial design work. Animations were done with Artlantis and Adobe Premier.

KWK Architects | Augustana University

garage, we created a concrete beam that spans across the top of it. So, we’re not throwing any load onto the top of the tunnel, but it’s being transferred down to the sides and into the footings. The building is supported from that.”

Making sure the decorative elements coordinate with the existing brick campus language, the building features a concrete terrace from a glass pavilion with sidewalls for seating. KWK is also utilizing some precast concrete trim and cement board panels with the masonry.

KWK likes to engage students, explains Wuennenberg, and 90% of the

time universities want the them a part of the process. “They want to know that they’re making the right decisions,” he says. While those that participate may not be the exact people using the building in the future, this connection provides insight into the culture—allowing KWK to learn what was unique about the institution versus another.

There are several methods that architects can use to solicit design feedback from students such as virtual tours, focus groups, online surveys, suggestion boxes and/or dot surveys. Although, they may be rewarded for their participation in the design process with dining credits, Amazon or iTunes gift cards, pizza parties, t-shirts or other fun activities determined by the university.

KWK suggests that designers consider working with student housing administrators on campus to determine which student organizations would be best to work with. Where return of investment, budget, and schedule are important factors for owners, Wuennenberg has found that users have a lot of input and understanding that can be a key factor in a successful project. “One of the things about delivery methods now, [contractors] are there at the meetings,” says Wuennenberg. “They hear firsthand what’s important, they’re not just getting a set of plans and specs and building from it but they know why, and why these things are important. I always feel it’s good to have the contractor at the table from the beginning of the design because…it affects the design.”

D

G

E c s T

Find this article at ForConstructionPros.com/ 21821507.

www.ForConstructionPros.com/Concrete

11/30/21 12:56 PM

938

ELIMINATE

DUST Get The Job Done Right.

Everyone has dealt with the trouble that a clogged vacuum filter creates, it takes up valuable time and creates a mess. Pulse-Bac solves this problem with our patented Automatic Pulse-Clean Technology™ that automatically cleans the filter while you work.

The Original & Patented Self-Cleaning Vacuum.

• Delivers Consistent Suction • Durable Steel Construction • Longopac Bagging • American Made

It's easy to see why Pulse-Bac Vacuums have been the industry performance leader for over 20 years.

www.pulsebac.com

9384 Ridgeview St, Tulsa, OK 74131 • 866-954-9700

CONC1221_38-39_DecConDesign.indd 39

12/1/21 10:15 AM

BY JENNIFER CRISMAN

Coating voids and pores in a concrete floor.

The Euclid Chemical Company

HOW TO PREVENT COATING DEFECTS CAUSED BY CONCRETE OUTGASSING

C

oncrete seeks equilibrium with its surroundings by releasing air and water vapor that expands when temperatures increase and absorbs air and moisture when temperatures decrease.

The phenomenon of air expanding and releasing itself through the concrete pores is called “outgassing.”

As air moves in and out of concrete with changes in temperature and barometric pressure, the expanding air travels through the pores and capillaries to the surface. However, because concrete is sponge-like and contains moisture, the air often brings moisture with it—often described as moisture vapor transmission (MVT). A primary function of surface coatings is to provide a barrier to the intrusion of water and other chemicals into the concrete, but when coatings are applied to a concrete surface that is outgassing, the air becomes trapped under the coating and the pressure of this trapped air causes a defect or pinhole in the liquid coating.

IDENTIFY & PREVENT Outgassing defects are rarely found across an entire surface. It is more common to find outgassing defects scattered seemingly at random around a coated concrete surface.

Defects can be clustered in areas directly exposed to sunlight, where

40 CONCRETE CONTRACTOR

CONC1221_40-41_PCPrevent.indd 40

DECEMBER 2021

mechanical surface preparation was more aggressive, or even where there’s increased air circulation over the slab.

• Monitor Environmental Conditions The primary method to reduce defects caused by concrete outgassing is to monitor the environmental conditions before and during coating application. A continuous flow of air over a porous concrete slab could entice entrapped air to flow outward, leading to outgassing and coating defects. Ensure that heating/cooling systems and open doors/windows are not blowing air across the concrete surface during the coating application and curing process.

• Track Temperature Changes An increasing surface temperature is a strong indication that outgassing will occur. When weather fronts are on the horizon, it is best to wait before coating. Hot concrete and/or rising ambient temperatures cause air to move within the slab at a more extreme rate. Barometric pressure changes can also push air into concrete and vacuum it out repeatedly. When barometric pressure fluctuates, outgassing may occur even when all other conditions are ideal. Application of the coating in a consistently HVAC-controlled environment, or in the evening when the air temperature is decreasing, can reduce the possibility of outgassing.

• Seal with a Primer To reduce outgassing, especially on porous or rough surfaces, seal the concrete after surface preparation with a low-viscosity, deeply penetrating primer. Because of its thin consistency, primers are less likely to exhibit pinholes or other defects from outgassing because the air is able to make its way through.

Primers soak into the concrete to fill the voids and capillaries that can hold air, thereby reducing the chances of outgassing. Most primers are moisture tolerant, and some are formulated to act as MVT reducers or oil blockers as well.

TIME TO REPAIR Repairing outgassing issues requires recoating with the same material.

Since most outgassing defects occur scattered around a project, reapplying only the affected areas will lead to an undesirable, patchy appearance. To correct outgassing defects both aesthetically and functionally, it may require an entire floor or wall to be recoated. This can be time consuming and costly.

Being aware of the conditions that lead to outgassing, thoughtful planning, and following precautions is the ultimate method to prevent and significantly reduce the possibility of outgassing.

Jennifer Crisman is director of marketing services at Euclid Chemical.

www.ForConstructionPros.com/Concrete

11/30/21 12:58 PM

by

complete solutions for concrete grinding, polishing and maintenance

To learn more visit us at WORLD OF CONCRETE BOOTH D530 & C5413 su perabrasive.co m

CONC1221_40-41_PCPrevent.indd 41

11/30/21 12:59 PM

BY CLAUDE BESSON

PROPER PREPARATION ESSENTIAL TO SUCCESSFUL FLOOR RENOVATION

C

orrect surface preparation is the key to obtaining beautiful flooring that lasts for decades. Concrete surface profile (CSP) is a standardized measure for the roughness of a surface that has been established by the International Concrete Repair Institute. It is expressed with a number from one to nine, where nine represents the roughest finish possible.

SafeBasementsInc.com Come find us at WOC Booth C5567

42 CONCRETE CONTRACTOR

CONC1221_42-43_PCPreperation.indd 42

DECEMBER 2021

There are several methods to obtain the ideal CSP for your application. These can be grouped in two broad categories: mechanical and chemical.

MECHANICAL METHODS Before starting any concrete profiling, it is very important to remove the old coatings with appropriate technologies, such as walk-behind or ride-on scrapers.

In this way, the removal will be achieved in minimal time, saving a lot of labor and fatigue and damaging the substrate as little as possible. This will also allow the operator to limit the amount of dust and broken parts generated while removing the old material. This step is very effective if operators use the appropriate blades and shanks, which will optimize tooling-related costs.

After this step, one of the most commonly used techniques for mechanical concrete profiling is abrasion. In this method, diamond grinding erodes the surface and causes a progressive disintegration of the concrete, which results in a flat and relatively uniform surface.

Abrasion leads to minimal surface damage and results in a very low CSP, usually around one to three.

Contractors can also use differences in heat to profile a surface, a method known as expansive pressure. In this approach, the surface is heated very quickly to a high temperature, causing the top to peel off. This is usually done with flame blasting, high pressure water jetting, or steam blasting and results in a rough surface with a CSP of six to nine.

To preserve the surface as much as possible, pulverization can be the way to go. Small particles traveling at a high speed collide against the surface, removing the top layer. This method causes minimal damage to the surface and can result in a broad range of CSPs, from two to eight.

Pulverization is commonly done by abrasive blasting—also known as sandblasting—and shot blasting.

Lastly, when a very rough profile is needed, contractors can consider the impact technique, which is usually done with a bush hammer or scarifier. In this method,

www.ForConstructionPros.com/Concrete

11/30/21 1:01 PM

L

h

the substrate crumbles as a result of repeated impact by a hardened point, which causes the aggregate and cement paste to crack. This damages the surface considerably but allows the contractor to obtain a very rough profile with a CSP ranging from four to nine.

CHEMICAL TREATMENTS Chemical reaction may sound like an obsolete and environmentally unfriendly solution, but there are still applications in which this is necessary. If the job site cannot accommodate big machinery and the substrate is so compromised that hand-held devices are not powerful enough, chemical treatments might be the only solution.

This method involves applying a solution of water and muriatic or citric acid to the concrete with a low-pressure sprayer or a plastic sprinkling can remove the superficial cement paste

The Hum-B Edge Grinder can cover more square footage in less time, with less effort while focusing on comfort.

The ergonomic design allows the user to work standing upright. Getting them up off their knees reducing fatigue, backaches, and job site injuries.

and expose the fine aggregate. Acid treatments produce a very light profile similar to fine sandpaper. Since light profiling is suited to thin coatings, this method is ideal for microtoppings that are less than 10 mm thick.

During the chemical treatment, toxic materials can be released, so it’s essential that operators wear personal protective equipment such as goggles. It’s also important to prevent contact between machinery and acid, since this could corrode any metallic components. Lastly, operators should be aware of local regulations on how to safely dispose of acid and contaminated water.

Claude Besson is the country manager for France at surface preparation expert National Flooring Equipment.

Find this article at ForConstructionPros.com/ 21427377.

PECORA-DECK HB1000 FAST CURING, LOW-ODOR, INDUSTRIAL GRADE POLYURETHANE COATING

PROTECT YOUR INVESTMENT SUN

WATER

SNOW/ICE

CHEMICALS

n FAST CURE ALLOWING FOR FASTER RETURN TO SERVICE n HIGH IMPACT AND ABRASION RESISTANCE FOR USE IN HEAVY DUTY VEHICULAR AND PEDESTRIAN AREAS n HIGH-MIL APPLICATION WITHOUT OFF-GASSING, BUBBLING OR SWELLING OF THE COATING UPON CURE n LOW-ODOR MEANS IT IS SAFE FOR INTERIOR APPLICATIONS WITH ADJACENT OCCUPIED SPACE n FIELD TINTABLE AND INTEGRAL AGGREGATE OPTIONS ARE AVAILABLE n COMPLIMENTS THE EXISTING PECORA-DECK LINE OF PRODUCTS

FOR MORE INFORMATION CONTACT YOUR PECORA SALES REPRESENTATIVE

PECORA.COM

Pulse-Bac Hum-B is the only edge grinder with the patented Dust Grabber™ shroud. This shroud allows the grinder to float across the surface like a puck on ice, eliminating suction lock and capturing 99% of airborne dust.

DUST GRABBER SHROUD™ Patented Anti-Suction Lock Technology

The Hum-B Edge Grinder is ideal for concrete, terrazzo, stone, and removing paint, thin-set, adhesives, VCT, mastic and epoxy. www.ForConstructionPros.com/Concrete

CONC1221_42-43_PCPreperation.indd 43

TRAFFIC COATING MEMBRANE

www.pulsebac.com/edge-grinders • 844-223-0584 DECEMBER 2021

CONCRETE CONTRACTOR 43

11/30/21 1:01 PM

Idea File

Shape Your

Success

At Curb Roller Manufacturing, we are proud to be the world leader in shaped concrete roller screeds! With our line of innovative screeds and concrete shaping products, you can complete a wider range of jobs without breaking the bank.

TAKE ON MORE JOBS IN LESS TIME We believe there should be an easier way to shape concrete, without hindering quality. With machines like the Curb Roller or the Batt Screed paired with a Lynx Screed System, our ergonomic and operator-friendly designs mean no special training required.

CUSTOM SOLUTIONS BUILT JUST FOR YOU With our line of innovative concrete roller screeds you can complete a wider range of jobs without breaking the bank. From custom drums to new products, we do our best to establish high-quality concrete shaping solutions for crews of all sizes.

ADAPTABLE PRODUCTS BUILT FOR EASE Made with contractors in mind, our products are made for simple transportation and quick adaptability. These machines are ready to take on a wide array of jobs by easily changing profiles, pipe lengths and more.

785-467-3132 // WWW.CURBROLLER.COM

MINNICH’S VERSATILE INNOVATIONS HELP MEET TODAY’S CONCRETE PLACEMENT CHALLENGES Minnich Manufacturing, the leading manufacturer of concrete dowel pin drills, concrete vibrators and vibrator monitoring systems, is dedicated to helping concrete contractors maximize efficiency.

Minnich’s Stinger and Controlled Speed Vibrator (CSV) are just two examples of how the company’s concrete innovations serve customers.

The light yet rugged Stinger electric flex shaft concrete vibrator is a 14.5-pound double-insulated universal motor that can drive the full line of Minnich vibrator shafts and heads from ¾ inch to 2 ½ inches.

The CSV enables contractors to communicate using their cell phone’s Bluetooth to select set speeds of vibrations per minute (VPM) in coordination with the concrete slump being poured.

Minnich will continue to bring products to the industry that support the findings of concrete research facilities across the country.

For more information, visit www.minnich-mfg.com

44 CONCRETE CONTRACTOR

CONC1221_44-49_IdeaFile.indd 44

DECEMBER 2021

www.ForConstructionPros.com/Concrete

11/30/21 1:03 PM

Idea File Concrete Pump Attachment FEATURES HYDRAULIC SQUEEZE PUMP







  

­

MAINTENANCE PADS

THAT WILL OUTPERFORM

ANYTHING YOU HAVE USED. The SUPRASHINE system includes a complete range of pads for all your floor care needs - restore, strip, deep clean, upgrade gloss, and daily clean.

• The best results in floor cleaning, gloss level and pad lifespan.

• Simplifiied, efficient and sustainable process.

www.superabrasive.com www.ForConstructionPros.com/Concrete

CONC1221_44-49_IdeaFile.indd 45

DECEMBER 2021

CONCRETE CONTRACTOR 45

11/30/21 1:03 PM

Idea File

TITEN® CONCRETE AND MASONRY ANCHORING SOLUTIONS From light- to heavy-duty installations, our broad range of Titen concrete and masonry anchoring solutions has exactly what you need to get the job done reliably. Backed by our long-standing legacy of expert engineering, each of our versatile and innovative screw anchors is designed for maximum ease and efficiency — ensuring a quick, smooth installation the first time, every time. And our skilled field support teams are always available to assist on the jobsite.

To learn more about the full line of easy-to-install Titen solutions from Simpson Strong-Tie, visit go.strongtie.com/ titenfamily or call (800) 999-5099.

46 CONCRETE CONTRACTOR

CONC1221_44-49_IdeaFile.indd 46

DECEMBER 2021

www.ForConstructionPros.com/Concrete

11/30/21 1:04 PM

Idea File

NEED TO GET A CONCRETE REPAIR PROJECT DONE FAST? A Hydrodemolition robot can complete the job 25x faster than jackhammers.

The Merlo P27.6 Plus delivers big capabilities in a nimble, compact design.

Measuring 12’10” x 6’0” x 6’5” it can lift up to 6,600 lbs with its no-flex boom.

Our machines are more than just another forklift.

AMS-MERLO.COM

Distributed by:

Brokk Inc. | 1-360-794-1277 info@brokkinc.com | www.brokk.com

At Husqvarna, we know that it takes more than just strength to create performance. As a world leader in concrete, drilling, and surface preparation equipment, we support proud professional users all over the world with efficient and reliable products.

Listening to our customers is our greatest source of inspiration.

When developing products, we always go for the optimal combination of power and usability. Our commitment to make your workday productive and hassle-free guides everything we do, from the initial research and development stages to designing, manufacturing and delivering the equipment. Our ambition is to provide you with the machines, diamond tools and service you need to perform your best so you can be proud of a job well done. Proud Professionals are our best reward.

www.ForConstructionPros.com/Concrete

CONC1221_44-49_IdeaFile.indd 47

DECEMBER 2021

CONCRETE CONTRACTOR 47

11/30/21 1:04 PM

Idea File NEW OZTEC BP-45 BACKPACK AND RUBBERHEAD® WITH OPTIONAL EXTENSION PIECE Oztec is proud to introduce the newest edition to its industry leading backpack vibrators.

The New BP-45 adds a powerful 2HP option, capable of running vibrator heads up to 2” in diameter, in a lightweight configuration. This backpack maintains Oztec’s Job-Proven Rugged design. Built to withstand the demands of concrete construction sites with a sturdy steel frame, dependable Honda engines, fully adjustable padding system and the highest quality components, all designed for easy maintenance and long life.

The BP-45 is an option between Oztec’s lightest weight model, the BP-35, and Oztec’s most powerful option, the BP-50a. As with all of Oztec’s power units, the BP-45 includes our patented Quick Disconnect for easy interchangeability with Oztec flexible shafts and vibrator heads.

New RubberHeads® with Optional Extension Piece In December of 2019 Oztec Industries, Inc. reintroduced its 1-1/8” & 1-1/2” RubberHeads®. Both of these heads are available with an optional rubber coated extension piece. With Oztec extension pieces, you can greatly reduce the chance of the vibrator head becoming entangled in the rebar. These heads were originally designed to meet the needs of the construction of the Hood Canal Floating Bridge in Washington State, where over 30,000 cubic yards of concrete were poured in heavily congested rebar without a single head getting entangled in the rebar.

Oztec RubberHeads®, ranging in size from 1-1/8” to 2-3/4”, not only protect epoxy coated rebar and delicate form faces, but also produce better consolidated concrete and are job proven to be more efficient and effective than any other vibrator head on the market!

Oztec Industries, Inc. 65 Channel Drive · Port Washington, NY 11050 1-800-533-9055 - 516-883-8857 - Fax 516-883-7857

www.oztec.com

48 CONCRETE CONTRACTOR

CONC1221_44-49_IdeaFile.indd 48

DECEMBER 2021

www.ForConstructionPros.com/Concrete

11/30/21 1:05 PM

Idea File INDEX

MEET BROKK 70 THE MINI SUPER HERO

ADVERTISER ..................... PAGE Allen Engineering Corporation ..............................2, 48 Aquajet ...................................................................19, 47 Best Contractor to Work For ................................ 34-35 Blastcrete Equipment Co. .....................................37, 45 Brokk Inc. ................................................................15, 49 Caterpillar Dealer Network* .......................................33 Crafco Inc. ....................................................................31 Curb Roller Mfg. LLC .............................................27, 44 Freud America Diablo .............................................7, 46 Gomaco Corporation ..................................................13 Husqvarna Construction Products..........................5, 47 Josam............................................................................17 Max USA Corp .......................................................18, 47 MERLO - Applied Machinery Sales ......................29, 47

Packed with demolition power, the BROKK 70 is the perfect solution for safe and efficient demolition in very confined spaces.

Minnich Manufacturing .........................................44, 51 Oztec Industries Inc. ..............................................48, 52 Pecora Corporation ...............................................14, 43 Pulse-Bac Vacuum Systems LLC ...........................39, 43

Booth W1305

SafeBasements Inc. .....................................................42 Salsco Inc. .....................................................................49 Simpson Strong-Tie .................................................9, 46 Strong Manufacturing ...........................................28, 49 Superabrasive Inc ..................................................41, 45

Brokk Inc. | 1-360-794-1277

* Denotes regional ad

info@brokkinc.com | www.brokk.com

Introducing for 2021, The TPC Guidance Controlled Slipform Concrete Paver The TPC is operated via a Radio Controlled Belly Pack instrument box. In auto mode, the machine will follow the guidance string and adjust tracking and screed elevation automatically. The screed comes in different widths from 48” to 96”. The TPC eliminates the need for forms. Just grade and set the string line!

Standard Features • The conveyor can be moved to feed the machine from either side.

• The hopper has an auger inside to be sure the material fills both sides of the hopper.

• The hopper has two hydraulic cylinders which raise the hopper and screed for transport and easy loading on the trailer.

• The 74 HP Hatz German engine is EPA compliant in all 50 states and delivers plenty of power.

• This engine, coupled with a proclaim pump, will give the hydraulic power needed year after year.

• This is a machine designed with only the basics needed to slipform the walk or pad with no forms required. By designing the TPC this way, we were able to cut the cost and make it affordable for everyone, not just the big guys.

MADE IN THE U.S.A.

www.ForConstructionPros.com/Concrete

CONC1221_44-49_IdeaFile.indd 49

105 School House Road, Cheshire, CT 06410, 800-872-5726, 203-271-1682

www.salsco.com

DECEMBER 2021

CONCRETE CONTRACTOR 49

11/30/21 1:05 PM

THE LAST PLACEMENT

»

BY BRAD HUMPHREY

How to Get Your Workers Excited for Work

G

Be sincere.

Cast a vision of your hope for the new year or the rest of the season. Remind your workers that you believe in them.

etting our employees excited for work continues to be a never-ending process for many contractors. Getting our workers “amped” is more than yelling or conducting some motivational pep rally, but does include some energy exertion by owners and leaders. If your workers don’t feel electricity from their leaders there is little incentive for the employees to extend themselves, much less get psyched up for another work year. ➊ GET YOURSELF AMPED. If you don’t feel it, how do you—realistically— believe that your employees will? We’re in the greatest industry in the world.

Think about this: Construction provides us the perfect opportunity that allows us to work with our hands; see some level of work accomplished each day; make the day for others; and make a good living.

Love what you do and your business.

Love those who are helping you fulfill some of your dreams. Love the fact that you are assisting others to make a great living. If this doesn’t get you amped, I don’t know what it will take. ➋ CONDUCT SPRING TRAINING. Bring your workers in a few days or a week before the new season starts. Conduct “basic” training on skill development, technical handling of equipment, how to complete your documentation, etc. Call a 1-3 day “time out” and revisit the skills and techniques important to your company’s success. This gives workers the chance to begin to anticipate the new season and helps them to focus on their own participation and contribution, raising their personal level of accountability and motivation. ➌ KICK-OFF THE NEW SEASON. Organize and hold a barbecue or fish fry to signal the beginning of a new season.

It signals a new year, a fresh start, new employees, new opportunities. Such

50 CONCRETE CONTRACTOR

CONC1221_50-52_LastPlace.indd 50

DECEMBER 2021

“new” beginnings often excite new workers and reassures the veterans that all old mistakes are behind us. This can also be effective mid-season to revitalize and reenergize for the second half of the year. ➍ SET SOME ‘BHAGS.’ In addition to yearly goals, try setting one or two “Big Hairy Audacious Goals.” Years ago, the term defined something so far out there that just striving to achieve it sent excitement, or outright fear, in the hearts and minds of workers. A BHAG might be reaching some sales goal, no safety incidents, “zero defects” in performance, or some incredibly high bonus for record sales or profitability. ➎ ENGAGING WORKERS. One seminar I attended pointed out that employers who really engaged their employees in their business, productivity improved 18-25%. This happened when leaders asked workers to contribute to new improvement ideas, provide greater clarity or insights on current problems, and take more ownership for problemsolving with the senior leader’s support.

For most of the companies I’ve personally consulted, those that had the healthiest work culture more often engaged their workers on setting goals, milestones, leading more meetings, solving more problems, etc., independent of micromanaging tactics of senior leaders.

This doesn’t mean that a contractor just gives employees carte blanche but allows workers a chance to really positively impact their own work and the performance of the company at large. ➏ NEW HATS & SHIRTS. There is still some great energy created when the contractor comes into a meeting with new logo’d hats, shirts, jackets, gloves, etc. Most construction workers love getting company shirts and hats. Even your office workers enjoy getting a new golf shirt each year.

➐ SIGN UP FOR A COMMUNITY EVENT. Remodeling a home, giving a yard a much-needed new flower garden, or passing out stuffed backpacks for underprivileged children are all the sort of events that can be done by your entire company. Efforts like this can bring your workers together, have them focusing on something other than themselves and seeing the value of giving back to those who can’t repay them or you. Take a picture. Let the press in. Don’t milk it but use such a time as a team-building event. ➑ SHARE YOUR DREAMS & EXPECTATIONS. While most contractors are not charismatic public speakers, their workers need to hear from them about their dreams and expectations for the company. All workers are interested in what their owners think and expect.

As the owner, share the following: • Your vision for the company • The reputation you want your company to reflect • Your goals for the new season (or the remainder of the season): sales, productivity rates, gross margin, etc.

• Your love for the company, your love for the industry, and your desire to keep an “open door” to all workers When workers hear and sense that their most senior leader is sincere, focused, and excited that gives them greater freedom to feel the same way.

Have some fun with new beginnings.

To think that you are beginning yet another new year in business is quite a feat anyway so celebrate living another year. Do something that is memorable and representative of the sort of leader and company that you wish to be known for.

For more from Brad Humphrey, visit ForConstructionPros.com/ contractors-best-friend.

www.ForConstructionPros.com/Concrete

11/30/21 1:06 PM

s

THE STINGER The Stinger electric flex shaft vibrator is rugged, lightweight, and powerful. The 115v electric motor has been designed to run cool with the power and torque to handle todays concrete loads.

The stinger attaches to competitor core and casing with quick disconnect adapters.

www.minnich-mfg.com

CONC1221_50-52_LastPlace.indd 51

11/30/21 1:07 PM

CONC1221_50-52_LastPlace.indd 52

11/30/21 1:07 PM