Asphalt Pro - January 2013

Better Production Practices

Rubberized Asphalt Bumps the Grade Stay Safe Fix it Now

Modify for RAP Build a Porous Pavement 2012 Asphalt Innovations Hawaiian Joint Disappears january 2013

contents

Departments

32

Letter from the Editor 5 Save Time with Social Media Around the Globe 6 Safety Spotlight 8 Spend Time to Fix What’s Wrong

by Cliff Mansfield Producer Profile 10 For Army Project, Ends Justify the Means

By John Ball

Equipment Gallery 52 Top 10 New Asphalt Products Here’s How It Works 60 ADM’s EX Series Drum 62 Richard Companies’ EZ-Flo RAS Scale

Last Cut 66 WTI Drops From the Energy Information Administration

42

20 When It Rains It Porous, Part II Here’s how to construct a porous asphalt pavement for excellent storm water management and LEED credits

By Timothy R. Murphy, P.E. 24 Rubberized Asphalt Lowers Costs

By Dan Brown

Equipment Maintenance 18 Hydraulic Shop Salvages CAT Cylinders

By Ray Kremble

Resource Directory 65

Articles

30 Buy Smart Purchasing a used plant doesn’t have to be scary

By Cliff Mansfield 32 Rubber Tires Grip Winding Roads

By Tom Kuennen 38 Here’s How to Apply Release Agents At the plant or at the paving site, proper asphalt release agent use saves money

By Sandy Lender 42 Increase Your RAP/RAS Use No matter what type of HMA plant you have, these tips can increase your recycle while decreasing your stress

By Steve Elam 50 Meet AEM’s 2013 Chairman Stu Levenick

By AsphaltPro Staff 52 International Mixes

By Cliff Mansfield

10 24

Better Production Practices

20 Rubberized Asphalt Bumps the Grade Stay Safe Fix it Now

Modify for RAP Build a Porous Pavement 2012 Asphalt Innovations Hawaiian Joint Disappears JANUARY 2013

Two contractors save costs when adding rubberized asphalt to binder. See related article on page 24. And watch for a discussion on best practices for handling large totes and bulk additives in the February safety issue. Photo courtesy of CEI Enterprises, Albuquerque.

editor's note January 2013 • Vol. 6 No. 4

Save Time with Social Media

2001 Corporate Place Columbia, MO 65202 573-499-1830 • 573-499-1831 www.theasphaltpro.com publisher

Chris Harrison associate publisher

Sally Shoemaker sally@theasphaltpro.com (573) 499-1830 x1008

editor

Sandy Lender sandy@theasphaltpro.com (239) 272-8613

Art Director

Kristin Branscom operations/circulation manager

Cindy Sheridan business manager

Renea Sapp AsphaltPro is published 10 times per year: January, February, March, April, May, June/July, August/September, October, November and December by The Business Times Company, 2001 Corporate Place, Columbia, MO 65202 Writers expressing views in AsphaltPro Magazine or on the AsphaltPro website are professionals with sound, professional advice. Views expressed herein are not necessarily the same as the views of AsphaltPro or Business Times Company staff, thus producers/contractors are still encouraged to use best practices when implementing new advice.

Subscription Policy: Individual subscriptions are available without charge in the United Sates, Canada and Mexico to qualified individuals.

One year subscription to non-qualifying Individuals: United States $90, Canada and Mexico $125.00. For the international digital edition, visit theasphaltpro.com/subscribe-2.

Single copies available $17 each.

I know it sounds dubious, but you can save time in your marketing efforts if you use social media properly. You can also waste a ton of time and frustrate yourself to no end if you use the wrong social media platforms or use the various platforms improperly. Myriad sites around the World Wide Web allow people with oh-so-delightful nicknames to spout that what they say—often in all capital letters—is the gospel truth about marketing, paving, advertising, asphalt production, networking, mix design and so on.

Let me share a secret with you. People who have hundreds of posts, comments or “credits” on a website or blog are the same people who have copious amounts of time to sit at a computer giving advice that may or may not be current. Think about that for a minute.

As an asphalt professional, do you have that kind of time? Of course you don’t. You can carve out bits of time to use social media efficiently for networking and expanding your asphalt business, and in this day and age, it’s become mandatory to carve out those bits of time for this important medium.

In good news, I’ll speak at the World of Asphalt 2013 conference in San Antonio in March about this subject specifically. I’ll share with you how to use online social media networking specifically to enhance your asphalt business presence and to increase your asphalt business volume. By the end of the presentation, you’ll understand how to sign onto the useful platforms and use them in an efficient and professional capacity to your company’s benefit with search engine optimization, viral tactics and a few other tips.

This is a pretty shameless plug for my seminar when you get right down to it, but it’s also an introduction to the fact that asphalt professionals have some ground to make up when it comes to marketing ourselves and our product to the web-savvy masses. That’s right. Our competition is out there touting the benefits of high speed rail (search the hashtag #HSR on Twitter) or porous concrete pavements or the reflectivity of concrete. I shudder typing these things, but I can’t be the lone voice in the wilderness calling these lobbyists misguided when it comes to LinkedIn and Google+.

Join me Thursday, March 21, at the early seminar to learn why you want to delete old acMake your plans to attend Sandy’s counts, why you want to focus presentation: TH11—Using Online on the professional accounts Resources to Grow Your Asphalt I’ll walk you through and how Business. Visit www.WorldOfAsphalt.com you can save time in your asand click on the “education” tab, or go phalt marketing efforts with the straight to www.worldofasphalt.com/ shortcuts I can share.

Education/General/PPP/ and scroll to Stay Safe, Thursday’s first session.

Follow @AsphaltPro on Twitter today and like our page on facebook at Asphalt Pro magazine.

Sandy Lender www.theasphaltpro.com | ASPHALT PRO 5

around the globe

Industry News and Happenings from Around the World China

During the period from January to September 2012, China imported 1.96 million megatonnes (MT) of bitumen. Most of its bitumen went to different ports: 496,304 MT (25 percent) went into to Nanjing; 251,096 MT (13 percent) went to Hangzhou; 243,448 MT (12 percent) went to Qingdao; 222,395 MT (11 percent) went to Tianjin with the remainder going to Nanning, Fuzhou, Huangpu, Xiamen, Ningbo, Haikou, Dalian, Zhanjiang, Guangzhou, Jiangmen and other ports. Source: Petrosil’s Bitumart

Russia

Russian partners make up the remaining investment after Tensar International, Atlanta, signed its agreement to build a manufacturing plant in Russia. Tensar is the majority shareholder in the joint venture. The company engineers geogrids and soil reinforcement technologies, and will now produce TriAx® geogrid in a plant on the southern shore of the Gulf of Finland, in the Peterhof area of Saint Petersburg.

United Kingdom

In UK South, the bitumen prices reported in early November held around the range of € 530 to 540 PMT. The average bitumen prices in Euro PMT for prices in UK South fluctuated from € 475 PMT in January 2012 to € 470 PMT in February, then held at € 535 PMT through March, April, May and June. The price dipped slightly to € 510 PMT for July, August and September, only to return to € 535 PMT for October and November 2012. For November 2012, prices remained almost the same as compared to October, firming up by € 60 PMT (13 percent) as compared with the beginning of the year.

Source: Petrosil’s Bitumart

United States

• You have the chance to show off your company’s young talent in the American Road & Transportation Builders (ARTBA) Transportation Development Foundation’s 2013 Young Executive Development Program (YEDP).

Before Friday, March 15, nominate someone who is less than 40 years of age but has at least three years of experience in the transportation design and construction industry and has shown evidence of strong leadership potential for the industry. Get a copy of the application form and more information at www.artbatdf.org or contact Sara Jones at sjones@artba.org with questions.

• For up-to-the-minute info and updates that impact the asphalt industry, follow http:// twitter.com/AsphaltPro. 6 January 2013

Arizona

Register now for the National Asphalt Pavement Association (NAPA) 58th annual meeting at The Phoenician in Scottsdale this Feb. 10 through 13, 2013. Visit www.asphaltpavement. org for full meeting details and sponsorship opportunities.

California

The Los Angeles Regional Water Quality Control Board recently adopted new storm water runoff regulations in Los Angeles County that place limits on 33 pollutants and create an opportunity for porous asphalt pavements to save the day. The latimes.com reported Nov. 9 that cleaning up pollution that has washed into coastal waters from urban runoff will be expensive for the cities in the region because bacteria and contaminants from 3,000 square miles show up. The report stated that officials wish to reduce storm water flows to the ocean by building green infrastructure. This is where the asphalt industry can step in and present its porous asphalt technology and benefits. Start by visiting http://lat.ms/SHscSj.

Colorado

• Everyone can register for the 40th annual Rocky Mountain Asphalt Conference and Equipment Show taking place Feb. 27 through March 1, 2013, at the Crown Plaza Denver International Airport. The theme this year is “Asphalt Pavement: A Life Cycle of Performance.” Visit www.rmaces.org for more information.

• Former Nevada DOT Director Susan Martinovich has joined CH2M Hill, Denver, as the highway/bridge director for North America.

In this role, she’ll be responsible for establishing the North American highway/bridge strategy among other tasks for the designbuild firm.

Georgia

The Arts Exchange community center in Atlanta awarded Liberty Tire Recycling top honors at its first volunteer appreciation awards ceremony in October 2012 for voluntarily removing more than 1,000 scrap tires that had been illegally dumped on the center’s property. Liberty Tire donated its tire collection and reclamation services in 2011.

Minnesota

Gov. Mark Dayton’s 19-member Transportation Finance Advisory Committee has proposed an increase in the gas tax and tab fees to help the state address a $50 billion shortfall

in transportation funding, boost revenues for highways and transit, and generate more stable funding for transportation while helping the state keep and attract jobs. Source: MPR News

Missouri

• Steve Jackson, technical manager for NB West Contracting Co., St. Louis, received his professional engineering license certificate at a special ceremony held in the state’s capitol rotunda, along with 13 other newly licensed professionals in November. Jackson oversees mix design, quality control, environmental monitoring and permit compliance at NB West’s three asphalt plants in Sullivan, Pacific and House Springs. He’s also responsible for the company’s recycling efforts and has been involved in the construction and paving industry for more than two decades. Congratulations to Jackson and NB West.

• WSI Waterjet Systems International™, Joplin, adopted this new name to better reflect the global nature of its waterjet cutting products.

Pennsylvania

In the first agreement of its kind in the car rental industry, Liberty Tire Recycling, Pittsburgh, has joined forces with The Hertz Corp. to recover and recycle scrap tires from all of the rental agency’s locations in the United States. This is expected to result in the collection and recycling of more than 160,000 tires annually, which will be added to the more than 140 million scrap tires Liberty Tire reclaims per year.

Texas

AsphaltPro editor Sandy Lender leads the workshop “Using Online Resources to Grow Your Asphalt Business” Thursday, March 21, at 7:30 a.m. during the World of Asphalt’s People Plants and Paving Training Program to be held March 19-21, 2013, in San Antonio. It’s early, but it’s packed with information on how to use social media efficiently to network and to expand your asphalt business specifically. Visit http:// www.worldofasphalt.com/ for all your registration needs.

Washington, D.C.

After meeting for its 2012 annual conference in California, the Association of Equipment Manufacturers (AEM) board of directors established its top policy priority for 2013 as federal deficit reduction. The group is calling for immediate bipartisan action to solve our nation’s debt crisis.

Also, Stu Levenick, group president of Caterpillar Inc., Peoria, Ill., was elected the 2013 AEM chair. Source AEM

safety spotlight

Spend Time to Fix What’s Wrong

by Cliff Mansfield

T

he asphalt plant and surrounding yard can be a dangerous work environment. Accidents happen far too often when workers don’t pay attention to details, aren’t taught good safety practices or become complacent over time. Most accidents can be traced to the same root cause: production needs supersede common sense safety practices. Let’s take a look at one such case in the western United States.

One early morning, a veteran asphalt plant operator who we’ll call “Jim” arrived at his plant to find that his heat transfer oil system had failed to start on time; his equipment wasn’t ready to run. Jim wasn’t surprised by this because he’d been having trouble with the start timer for quite a while. In the interest of maintaining production quotas, he just hadn’t repaired it yet.

Jim started the heating system manually, and then began adding heat with a propane torch. He’d been heating a jacketed suction line for about 10 minutes when one of the small, braided steel lines that carries heat transfer oil to the suction line failed. It sprayed him with 300-degree oil.

8 January 2013

Apparently, as he had applied heat to the heavy 3-inch steel line, he had repeatedly gotten too close to the smaller line and exceeded its temperature limit, causing it to rupture.

Jim spent several months in a hospital and then a year in rehabilitation. He still works for the same paving company, but to this day he won’t go near the asphalt plant.

How could this kind of accident have been prevented? It’s not just a steady hand to avoid the smaller, lower-heat-limit line that comes into play. Jim shouldn’t have been heating any lines with a torch.

Notice also that Jim was a veteran plant operator. He knew better than to play with safety boundaries, yet he hadn’t taken the time to repair the malfunctioning timer. Instead, he wasted time using an unsafe practice to heat up a jacketed suction line. Sometimes the pressure of meeting production takes common sense out of the equation.

The accident in this story can be traced directly to a lack of proper maintenance. The whole scenario could have been avoided if the heat transfer oil system had been properly maintained and operated as the manufacturer intended. A few minutes of repair work could have saved the day.

LEFT: Two asphalt lines are easily seen on the side of this Heatec Heli-Tank.

The asphalt pipes are inside an outer pipe that serves as a hot oil jacket. Hot oil in the jacket keeps the asphalt hot. Insulation for these lines is optional. An asphalt line is also visible running into the side of the Astec Double Barrel drum mixer. Each line has temperature limits and safety precautions concerning its proper operation and maintenance that plant operators and ground personnel must respect. Photo courtesy of Heatec, Chattanooga. ABOVE: If a vital control such as the start timer or a 7-day timer pictured here should give the operator any problems, it’s time to replace it.

Having such items on hand in the shop makes repairs quick and easy; most OEMs can send a new one overnight. Even if it takes time out of production to fix, that’s time spent saving a life. Photo courtesy of Heatec

As mentioned above, a common thread in asphalt plant accidents is a disregard for safety issues in deference to production pressures. Asphalt plant operators often feel tremendous pressure to produce by any means possible. Unfortunately, this shifts the focus off safety and onto money without anyone realizing it’s happened.

A clear-cut set of guidelines dealing with the company’s policy on safety issues should be drawn up and distributed to everyone involved with the plant. Be sure to include the paving superintendent so he or she doesn’t unknowingly exert pressure on the plant operator.

Remember: Everyone wants to do a good job that the state inspector or owner/agency will approve. Sometimes employees go to great lengths to get results. To that end, conditions are overlooked that would never be overlooked or forgotten under normal circumstances. When dealing with safety issues, one must keep in mind the fact that you need to be safe all the time; you need only be careless once for tragedy to strike.

Cliff Mansfield is an asphalt plant engineer and a freelance writer specializing in asphalt plants. For more information, contact him at (541) 352-7942 or send him your question through the “Ask the Plant Expert” form on the home page at www.TheAsphaltPro.com.

www.theasphaltpro.com | ASPHALT PRO 9

producer profile

For Army Project, Ends Justify the Means

By John Ball

O

nly 26 years have passed since C.W. Rusty White founded Road Builders Inc., Honolulu, Hawaii, but the 15 employees have more than 175 combined years of experience in the construction industry. The team manages, coordinates and controls all resources to ensure quality workmanship and completion on schedule and on budget. One way they’ve worked toward that goal is with onsite training since 2005. Another is to expand operations. Erik Rhinelander, the operations manager, has recently ordered

10 January 2013

an ADM RB-160 series parallel flow plant from the mainland so management can add one more element to its resources. For the most recent project we worked together, the plant wasn’t on site, so we planned to pave as business as usual. We planned and executed a tight project for the Grow the Army, South Range, Schofield Barracks in October 2012.

Considering this was a Corps of Engineers job, the compaction requirements were just like an airport job. We had to get 94 to 98 percent density on

the mainline and only 2 percent lighter on the joint. It was basically a P401 spec. We had a slew of pay factors to think about—compaction, ride spec, joint spec and mix design. And we had to think about achieving those factors in one day. For this kind of quality control (QC), we needed to sit down and map out what we were going to do.

To begin with, we wanted to own the plant. We wanted it designated to us only so we wouldn’t be held up with anything. We couldn’t afford to stop.

Because the plant Road Builders had

LEFT: Paver Operator Vernon Souki kept his machine’s front guide bar right on the step of Paver Operator Jansen Tam’s screed as they inched down the roadway at 10 feet per minute. Screed operators were Michael Gardner and James Woodward on the paver in lane 1 and Kai Pacyau and Maurino Batangan on the paver in lane 2. Gardner was also the paving foreman on the project.

ordered wouldn’t be on site for this job, the company ordered mix all in one big sum from its long-time supplier. In other words, we requested all 1,133 tons of mix be delivered without stop. This meant the 20 tractor trailers hauling to us could bring 40 loads uninterrupted, as long as the plant didn’t have any hiccups.

Rhinelander liked that plan for QC purposes as well as timing. “The mix was a minus ¾-inch U.S. Army Corps of Engineers mix that used a PG6416 binder,” Rhinelander said. “The

aggregate was all 100 percent crushed basalt with the minus #4 material being imported from Maui. One of the four pay factors for the project was the standard mean deviation on the air voids when compared to the job mix formula.

[The supplier] had to make sure the mix stayed consistent.”

Getting the mix right was job one.

Next was getting it delivered in a timely fashion. That took a smart game plan. Rhinelander and I got together with the foremen on the job to see how we could pave 1,133 tons in two lanes without interrupting anything. We decided to pave in echelon.

Road Builders had two Blaw-Knox pavers, each with a 5510 Carlson screed on the back that could reach 19 feet wide. We only need a foot out to each side on each screed. The challenge we ran into was with the hopper capacities.

For one paver, we had a hopper insert that could easily hold 18 tons of mix, which it took a Shuttle Buggy about 45 seconds to fill.

The other paver’s hopper didn’t have that capacity. How could we run them side by side? How could we feed them with the large tractor trailers unless Road Builders invested in another hopper insert? We decided to get innovative and built up the hopper of one of the pavers.

We built it up like a bath tub, you might say, using conveyor belt material as you see in the picture on page xx. Notice the chain half-way up on the outside of the “bath tub” wall. That’s in place to keep asphalt mix from pushing against the wall and falling out onto the ground. This idea allowed the hopper to hold about 8 to 10 tons at a time, which took a Shuttle Buggy about 10 to 15 seconds to fill.

By strategically staging the pavers and Shuttle Buggy, loading and paving became a beautifully choreographed operation. To begin, we positioned the Shuttle Buggy in Lane 2 ahead of Paver 2. The first tractor trailer approached it from the front and began filling its hopper continuously while the Shuttle Buggy filled Paver 2’s hopper. As I mentioned, this took about 45 seconds.

Paver 2 was heated up and ready to go, but Paver Operator Vernon Souki waited for his mark.

The Shuttle Buggy’s conveyor swung 30 degrees to feed Paver 1’s homemade hopper bath tub. Paver Operator Jansen Tam watched and prepped his machine for takeoff. That took about 10 seconds and the three machines were ready to move, placing material at 3 ½ inches to allow a fluff factor of 1 inch. We laid 2 ½ inches of compacted mix, achieving 127 feet per load.

As long as Souki kept his front guide bar almost touching the step on Tam’s screed, those two pavers were exactly where they needed to be. Tam, as the front paver, set the pace, moving forward together at a rate of 10 feet per minute. The Shuttle Buggy moved along with them at the same pace. We arranged it so there was no hesitation down the lane and 7 ½ hours later, we reached the end of the job.

Of course, getting to the end of the job required compacting behind the pavers. What was interesting about compaction on this project, besides meeting a strict spec, was the size of the breakdown rollers.

They didn’t match.

Whenever possible, you want to have matching machines in the breakdown position on a job. You want equal force and equal drum widths to ensure equal rolling patterns and equal compaction effort. For Road Builders, it wasn’t possible to put two matching machines on the job. So we put two good machines and two great operators in the breakdown position and got excellent results.

We started with a Sakai SW850, which has an 84-inch drum for operator Wayne Kalani. Operator Nathan Pamatigan ran a Dynapac CC 222 roller www.theasphaltpro.com | ASPHALT PRO 11

producer profile

with a 72-inch drum. The rollers have the same centrifugal force, but the 72inch drum will make seven passes to get three coverages whereas the 84inch drum will make five passes to get three coverages. The effort the men put into the rolling of the South Road reflect these adjustments very well.

We also used a Rosco pneumatic tire roller as an intermediate roller. We ballasted the 75 psi, 15-inch tires, filling it completely with water so it weighed about 11 tons. We wanted the pounds per square inch to knead out the material and get compaction. For the finish zone, we used a Hamm HD 14 and Dynapac CC 142. Both are vibratory rollers, but we used them in static mode.

We kept the rolling zones within 300 feet of the screed.

You’ll notice that none of the rollers I’ve mentioned are three-axle rollers.

Folks just don’t use those much anymore, yet if you go “by the book” in 12 January 2013

Hawaii, you’ll have to put one on your job. The engineer for this job was a bright young woman new to field work.

While her knowledge of the mechanics was admirable, we had to be diplomatic in explaining that operations in the field have taken some turns since “the book” was written. It’s the camaraderie that engineers on the job and contractors around the industry have with each other that helps such communication.

We don’t want to deviate from the final results on a job, but the procedures might change a bit.

One of the things they required on the job, as I mentioned, was a three-axle roller. The three-wheel might weigh 14 tons, but a vibratory roller weighing only 10 tons can out-beat a threewheel roller any day of the week. Instead of static pounds per linear inch, we get amplitude and frequency out of the vibratory machine. We convinced the people watching the project that

ABOVE: Operations Manager Erik Rhinelander, in the foreground, addresses about half the crew before paving begins. Twenty trucks delivered 40 loads of 24 tons each to the constant paving train during the 7 ½-hour shift so the crew had to be ready for the detailed day of echelon paving.

we could get compaction by a bit of a change in “the book,” and everyone was pleased with the result.

Nearly 8 hours of non-stop paving with extreme attention to detail can take its toll on a worker’s nerves, let me tell you. But the Road Builders crew held up great. This was the first time these guys had ever paved in echelon with the Shuttle Buggy. They used two paver operators and four screed operators. They didn’t start paving until they had five trucks in front of them after they had emptied the first three trucks. They marked out their boundaries. They had a centerline and the

producer profile

ABOVE: Breakdown rolling had two different sized drums, but skilled roller operators Wayne Kalani on the Sakai SW850 at right and Nathan Pamatigan on the Dynapac CC 222 at left handled it beautifully.

Can you see the centerline joint? BELOW: Wherever that chain falls, the end gate follows. They’re part of the paver and they balance the screed with the tractor.

boundaries of the outside parameters.

They had rods every 50 feet to help keep track of distance and yield. They had distances measured out so they knew exactly where they were at all times. And they had the Carlson heated screed with its heated end gates, which I consider a secret weapon on any project.

The heated element heats the end gate—or door—to about 300 degrees. It keeps the mix from sticking to the metal, which lets you press a nice sealed joint. When I match that with the next pass, it bonds beautifully.

14 January 2013

ABOVE AND BELOW: Notice the chain across the front of the hopper insert build that Road Builders put together for this project. The chain strengthens the front wall to keep asphalt mix from pushing under it and onto the ground. The bath-tub-like hopper insert allows the paver to hold about 8 to 10 tons at a time, which took the Shuttle Buggy about 10 seconds to fill.

Rhinelander is setting the company up for more beautiful projects. As mentioned above, he’s arranged the purchase of a plant so the company can make its own mix in the future.

Rachel Widemann, Jade Richardson and Severino Agbayani are the owners of Road Builders and, according to Cliff Mansfield, didn’t reach the decision to expand easily. Now that they have, Rhinelander says it’s a boost for the company in more ways than one.

“We wanted to be able to secure and serve our current and future customers by gaining full control over

our operations,” Rhinelander said.”

In what became an increasingly more competitive market, we needed to become more independent and gain control of our cost. Our employees were pumped up knowing that the company made this type of commitment and investment into help securing everybody’s future employment. It was a big risk on the owner’s part and like all great companies, you need to believe that you have the type of workers that will do what it takes to make the company successful.”

producer profile TOP: John Ball considers the heated end gate a secret weapon. Notice the heated element, which plugs into the extension of the screed, hangs through the end gate and leads to a very clean plate/ski. It heats the end gate or door to about 300 degrees and keeps the mix from sticking to the metal. If you look at the back side, the mix is pressed as if it’s been ironed like a shirt. There are no clumps of segregated mix breaking off because the edge leaves a nice sealed joint. When the paver matches that with the next pass, it will bond beautifully. End gates are Ball’s pet peeve. If they’re not clean, you won’t have a smooth mat. MIDDLE: Workers physically adjust the nut (#2) to set the auger in or out in accordance with the end gate so the feed sensor (#1) remains half way between the end of the auger and the end gate. The feed sensor then “talks” to the augers. It sends a beam out 10 times per second to measure the head of material beneath it. It sends the measurement to the automation box located at the operator’s station on the screed where the auger speed can be automatically adjusted to modify the head of material, thus the amount of material being fed to the end gate. BOTTOM: Notice the front of the hopper insert that the team built for Paver 1 has a large white box with an X painted on it. Ball painted this target when the Shuttle Buggy operator had difficulty lining up the conveyor with the hopper. It was an easy fix for what could have been a time-consuming problem.

The ADM Road Builder 160 that they’ve purchased was built new in 2005 and only ran about 30,000 tons for its former owner. They’re modifying it to run RAP and they’ve had help along the way.

“Use a consultant to help with the purchase, setup and training along with having them show you different plants along with the pros and cons of each,” Rhinelander said. “That would be the number one piece of advice I would share.”

For Road Builders, the consultant that helped them out is Cliff Mansfield, Odell, Ore. He liked the idea of Road Builders’ taking control of its own destiny. “It’s always a good strategy to gain control of every aspect of the ‘supply side’ of your business,” he said. “No matter how good your paving crew is, it’s impossible to make money without hot mix to pave. By controlling the ‘when, where and how much’ of the supply side, Road Builders just stepped up to the best level of paving contracting.” (See “Buy Smart” on page 30.)

Mansfield also bragged on Rhinelander. “Erik is the spark plug in this process. He was relentless in pursuing options and keeping the process alive.”

As he was with the introduction of the asphalt plant, Rhinelander was a great force behind the success of the Schofield Barracks project. A team like Road Builders’ that plans ahead and puts true dedication to detail into its projects is the team that ends up with a top quality pavement.

John Ball is the proprietor of Top Quality Paving, Manchester, N.H. For more information, contact him at (603) 493-1458 or tqpaving@yahoo.com.

16 January 2013

equipment maintenance

Hydraulic Shop Salvages CAT Cylinders

R

ebuilding heavy equipment makes good economic sense these days. Caterpillar dealer Whayne Supply, Corbin, Ky., added a Sunnen HTA tube hone in 2009 to resurface scratched and rusted cylinder barrels, which saves its customers 80 percent or more over the cost of a new barrel. Since then, mechanics have used the hone to process more than 1,000 barrels. Bringing the previously 18 January 2013

By Ray Kremble

outsourced machining work in-house has helped Whayne add revenue and staff, while improving control of delivery schedules and costs. That’s something most contractors will want to take a look at.

Whayne is a leader in Cat-certified rebuilds of complete machines, having produced more than 400 on 33 different machine models since 1985. The company was honored for completing

the five thousandth Cat-certified rebuild in 2011. Whayne has 14 locations and approximately 1,300 employees, with 200 located in Corbin. Mike Harbin, the manager of Whayne’s Power Rebuild Center, pointed out that simple economics sends customers in to rebuild machines.

“We have customers who are tearing down machines in the field and completely rebuilding them,” he said.

“The machine shop and the honing system have helped us stay on top of this trend. We have added five people in our shop alone to handle the increased volume.”

Whayne has rebuild centers in Louisville and Corbin.

“We can replace the barrel, rod, rod eyes, head/seal areas, hydraulic lines and connections, or custom fabricate new cylinders to spec,” Michael Carter said. He’s the service coordinator.

There are four hydraulic cylinders on the average Cat machine, so the shop stays busy, processing about 1,000 cylinders in 2011. “During the summer, we may have a hundred or more cylinders outside our shop waiting to be rebuilt because our indoor storage is full,” Carter added.

The shop’s old hone consisted of a drill motor on a sliding carriage, and lacked the power, capacity and rigidity workers needed, according to Carter. “It could produce a surface finish, but not remove metal.”

Whayne agreed to beta test Sunnen’s new all-electric HTA cylinder hone, and later purchased the machine with a 12-foot (4-m) part capacity.

The HTA tube honing system handles parts weighing up to 8,000 pounds (3,629 kg) with ID ranges from 2.5 inches to 21 inches (63.5 to 533 mm). It’s designed for resurfacing and repair work where light-duty stock removal up to 0.030 inches (0.76 mm) is required.

Whayne uses both roughing and finishing abrasives, removing scratches and rust, and imparting a specific crosshatch surface finish on the barrel bore. “We can increase the cylinder bore diameter up to 0.254 mm (0.010

inch) in relatively short time, removing rust and all but the worst scratches, and remain within Cat machine specifications,” Carter said. “Our old hone simply could not do this.

“We scrapped a lot of hydraulic barrels or sent them out to other shops prior to acquiring this machine,”

Carter added. “Now we can salvage a cylinder with honing, and the cost and time for the customer is a fraction of replacement. In the current economy, customers appreciate this.”

For more information, contact Sunnen Products Co., St. Louis, at (800) 325-3670 or sales@sunnen.com.

www.theasphaltpro.com | ASPHALT PRO 19

When It Rains It Porous, Part II Here’s how to construct a porous asphalt pavement for excellent storm water management and LEED credits

P

orous asphalt is a permeable asphalt pavement system produced with little to no fines. The system allows water to pass through the hot mix asphalt (HMA) or warm-mix asphalt (WMA) layer. Because water passes through the asphalt, designers must ensure that it also passes through the aggregate support system and soils through proper specification detailing.

Porous asphalt pavements provide the opportunity to eliminate catch basins, laterals, manholes, long drainage runs of pipes and retention ponds.

Porous asphalt is an integral part of a storm water management system and best management practices. The system of porous asphalt, aggregate and soil allows for the natural filtration of contaminants, preventing their introduction into streams.

Some designers are concerned that, in the tier of states exposed to freezethaw, the system may not be cost effective. Their concerns shouldn’t be limited 20 January 2013

to a geographical area. Rather, they must be addressed during the design phase to build the best system possible for our clients. There again, some DOTs have neglected to use porous asphalt pavements because they’re waiting for a specification—they’re waiting on the design. If you run into this barrier, remind your state officials that porous asphalt mixes and open graded friction courses (OGFC) have similar requirements, and OGFC have been around a long time. Do keep in mind that an OGFC uses a stone that is probably a little too small in size for a porous pavement system.

Porous pavements can work with due diligence. One of the essential qualities of a porous pavement is it ability to let water pass through the entire structure rapidly.

If you only build the system half way, you set yourself up for problems. Some designers don’t make the structure 100 percent porous. They make a catch

By Timothy R. Murphy, P.E.

ABOVE: When the Cathedral Basilica of St. Louis needed a parking lot facelift, the paving team placed a dense-graded mix where traffic travels and a porous asphalt pavement system in the spaces where traffic parks.

basin, which isn’t part of the plan. The full system is to build the pavement and allow the water to percolate all the way through. That’s key to being LEED accredited and being a true porous structure—regardless of what surface you put on top of it.

As noted, the structure is not limited only to the HMA layer, although we will discuss its design and construction here. The underlying aggregate structure (recharge bed) must contain ample void space over the entire life of the structure to ensure free water passage.

Complementing any porous asphalt pavement and aggregate structure is the ability of the subgrade (soil) to pass the water (percolate) into the existing soil. Let’s start there.

Build a Porous Pavement for Best Drainage

Subgrade At this point, we have to neglect what we know about geotechnical requirements for optimum moisture content and in-place soil density. We actually don’t want to densify the soil because we want to let water percolate into the strata. One thing I have learned about this structure is that “less is more” when it comes to compaction.

Less soil density means easier percolation, some challenging construction practices, less construction equipment, less effort and overall less expense. One of the things you want to make sure of is to use excavation—and other—equipment with a soft footprint in order to reduce any compaction of the soil.

Another benefit to porous systems is their ability to reduce cut and fill and their ability to allow a relatively flat pavement structure. Usually a porous system isn’t built on an embankment unless the embankment is granular. Finally, if the soil doesn’t have a high permeability and can’t adequately allow water percolation, then an under drain system is often used to supplement or replace the drainage desired from the uncompacted soil. In some situations, this will still be cost effective, provided that structures and a retention basin aren’t needed.

A successful system I can share with you is a 90-foot by 20-foot porous pavement in place at the Denver wastewater building. For the system, the crew began with a schedule 40 HDPE 4-inch under drain pipe placed in a tapered trench about 6 inches wide at its base

and 6 inches deep. The perforated pipe allows water in for carry-away. They placed a 16-millimeter liner under all paved areas and wrapped it up the side of the system to the top of the pavement. They filled the trench around the pipe with AASHTO #67 stone.

Interface Non-woven geotechnical fabrics are used to protect the aggregate subbase from the uncompacted soils. If we don’t install the fabric, then the system will begin to close down as the soil will plug the aggregate void structure. This is unacceptable. Take care when installing the fabric to ensure that protection occurs. Fortunately, this isn’t a new product or technique.

Waterproof barriers and under drains are often employed if the soil doesn’t or can’t take on the water.

For the Denver waterworks parking lot project, the crew placed a woven geotextile fabric across the 20-foot width. It met ASTM D4751 specs and ASTM D4633 minimum trapezoidal tear strength of 100 by 60 pounds and a minimum COE specified open area of 4 percent. Atop that filter, they placed 6 inches of C-33 sand and another geotextile fabric layer.

Recharge Bed The success of the system hinges on the recharge bed. Too much excavation and aggregate installation will increase cost with no advantage to the system; too little excavation and aggregate installation will cause the structure to flood, overflow, freeze or close down

Not every porous system will require each step listed here, but the basics are the same no matter where you are. Let the design of the porous asphalt pavement system do its job in removing storm water runoff efficiently and effectively by building it properly.

Step 1. Place a geotextile fabric/ filter that meets your state’s specs down on the width of your pavement bed, but do so with lightfootprint equipment so you don’t over-compact the soil beneath the system.

Step 2. Smoothly place several inches (6 is acceptable) of ASTM C-33 sand atop the first geotextile filter.

Step 3. Place a second geotextile fabric/filter down on the width of the smoothed sand.

Step 4. Smoothly place an inch of ASTM C-33 sand atop the second geotextile filter.

Step 5. Place and shape with a bobcat or similar front-end loader 4 to 6 inches of #3 aggregate atop the smoothed sand.

Step 6. Place and shape 2 to 3 inches of AASHTO #67 aggregate atop the thicker aggregate layer.

Note that it’s best to ensure the #67 aggregate is crushed with fractured faces for natural interlock and natural spacing when a static, 10-ton roller passes over it.

Step 7. Lay one to two lifts of porous asphalt mix, compacting it in static mode to set the stone skeleton. Note that it’s best to use a tracked paver to get a wider distribution of the equipment’s weight to avoid compacting the aggregate layers below. I also recommend giving the mat a few minutes to cool before putting the breakdown roller on; this helps contain densification.

in freeze-thaw climates. This is where a good engineer comes in handy.

The engineer needs good geotechnical reports and a complete understanding of water surface run-off from adjoining properties. Typically, installations are from 12 to 36 inches in total thickness, placed in several layers. Workers want to avoid driving trucks on the www.theasphaltpro.com | ASPHALT PRO 21

geotextile fabric. Spread and grade the 3-inch aggregate with tracked equipment, minimizing consolidation during installation. Many contractors spread the aggregate using bobcats.

Usually, the lower portion of the recharge bed is built using 3-inch clear stone much like railroad ballast. The stone needs to be locked or seated together by static compression—don’t consolidate it. The recharge bed is successful because as a single sized material it contains 40 percent voids (twice the HMA void space), so water is free flowing. Additionally, the bottom is built as flat as possible to ensure even draining and minimum overflow of water from the sides of the recharge bed.

The crew in Denver put 1 inch of C-33 sand on top of its second geotextile filter and then 7 inches of #3 aggregate.

Choker Course Approximately 3 inches of ½-inch (AASHTO #57) or ¾-inch (AASHTO #67) clear stone is placed on top of the recharge bed to close down the extremely large void spaces in the lower layer, allow for more accurate grading, and assist in the ultimate placement of the HMA with conventional trucks, paving equipment and static rollers.

You lock the surface to ensure you have a stable platform for paving. Because of the importance in building the aggregate foundation, you can anticipate lower production during this operation until you get comfortable with the process.

For the Denver waterworks project, the crew placed 2 inches of #67 aggregate, all fractured faces, between the #3 aggregate and the asphalt layer.

Porous HMA Designs are fairly simple. You can perform them using Superpave gyratory compaction equipment or Marshall hammers. Establish the proper gyration limit (Ndes = 50) with a singular goal of maintaining approximately 20 percent voids in the lab compacted mix for control. Typical gradations easily fit into most agency existing Open Graded Friction Course (OGFC) specs.

I recommend 80 to 85 percent coarse aggregate and about 6 per22 January 2013

Maintenance Considerations

ABOVE In this image, the dense-graded portion of pavement where traffic is allowed to drive looks like a sheet of glass where rain can pond on the surface. To the left of that lane, you can see the stripes delineating parking spaces where a porous asphalt pavement system allows rain water to drain efficiently out of the parking lot.

cent asphalt content going into it based on absorption.

Several mix design, production and construction items to be aware of are as follows: • Watch for liquid drain down as asphalt contents approach 6 percent.

• Use polymers.

• Densify porous asphalt with two or three passes with a 10-ton static roller.

• Be aware that you may have to let the porous asphalt cool some before breakdown rolling to avoid overcompaction or reduce production temperature.

• Consider the use of a track paver to distribute the load and therefore reduce additional aggregate consolidation.

Typically, porous asphalt thicknesses range from 2 ½ to 6 inches. The thickness will be determined by soil, climate and traffic loading over the life of the structure. For the Denver project, the crew placed 3 inches of porous asphalt.

Keep in mind that lower lifts can be as large as 1-inch top size and surfaces 1/2-inch. Finally, regardless of top size, you can ensure very good porosity through the HMA when 35 percent is passing the #4 sieve, 15 percent is passing the #8 and approximately 2 percent on the minus 200. These will vary depending on aggregate type, shape and asphalt content. A good starting point is to follow the standard OGFC for the state in which you’re building.

DOT officials and other owner agencies can use porous asphalt pavements in multiple settings without worry when their regular maintenance protocol takes a smart turn. For instance: • Keep dirt and debris from collecting on any porous pavement surface.

• High power vacuum the system annually—or more often if you see it’s needed.

• Do not seal coat the structure.

• Do not use sand or other gritty material such as cinders for winter needs.

• Keep snow plow blades slightly higher than usual when clearing the pavement.

• Keeping new roadways clean during home construction is difficult, so consider building the porous pavement last.

One of the considerations city planners have is placement. You want to put the porous pavement in a place that doesn’t take in a lot of debris.

There are numerous reports out that officials don’t want to use OGFC in the Midwest because they don’t do enough maintenance there. Letting dirt and debris get down into the pavement or get carried with storm water into the aggregate layers clogs the system and leads to a lessening of its effectiveness. What’s surprising is how well porous pavements work on high-volume roadways. We’re seeing that traffic pushes moisture through the system, thus keeping the system clean. For small-volume roads, the low volumes of traffic can push debris into the system instead. That starts to close it down if you’re not following the maintenance steps above.

Remember that there are best practices for designing, placing and using porous asphalt pavements. Spread the word to your state agencies and follow complete best practices to get the system 100 percent in place.

Timothy R. Murphy is the proprietor of Murphy Pavement Technology, Chicago. For more information, contact him at (773) 874-9800 or tmurphy@ murphypavetech.com, or visit www. murphypavetech.com.

www.theasphaltpro.com | ASPHALT PRO 23

Rubberized Asphalt Lowers Costs

By Dan Brown

A

ccording to a recent Rubberized Asphalt Foundation (RAF) survey of 152 transportation professionals, 70 percent of transportation agencies have used or currently use recycled tire rubber in asphalt mixes. “The survey does show recent growth in the use of rubberized asphalt (RA),” George Way said. He’s the chairman of RAF. “Most

24 January 2013

likely the reason for this is the recognition by agencies and contractors that asphalt and polymer modifiers are becoming very costly. Asphalt costs approximately $600 per ton, whereas recycled tire rubber costs about $300 per ton. [See this month’s Last Cut on page xx.] Likewise polymer may cost more than $1,000 per ton. Recycled

tire rubber is an attractive extender of asphalt because it contains both polymer and binder, both of which can improve the quality of conventional unmodified asphalt. Recycled tire rubber can, to a degree, substitute for polymer because it contains polymer, which can contribute elastic properties to the asphalt.”

At LEFT: Illinois isn’t highlighted on the map at right yet, but here you can see a crew working hard to place rubberized asphalt mix on a toll road near Chicago. As with any good paving practices, you want to keep the breakdown roller close to the screed. Watch out for sharp stops and curves that cut into the AR mat so you get a smooth finish like the one Justin England describes in the article. ABOVE: This illustration from the Rubberized Asphalt Foundation shows which departments of transportation have currently implemented standard use of rubberized asphalt (RA)—13 states in dark green—and which have performed successful lab and field testing of RA—5 states in lighter green.

How it’s done

Dave Olson, president of Dobson Brothers Construction, Lincoln, Neb., said RA can make a binder less

expensive in his experience. “You can buy a lower-grade binder, add the rubber to it, blend the rubber into the binder, and change the properties of the binder into a higher grade or modified binder,” Olson said. “We have a portable blending unit that we can use for our own operations, or we can quote it out to other contractors to hook up to their plants to use in producing rubberized asphalt.”

Olson said the savings realized with RA vary by project. “Each job will have a different thickness and a different grade of binder,” Olson said.

“A county road that carries very little traffic is going to use a low grade of asphalt cement (AC). But if you’re doing something on the interstate that

requires a high-grade, say PG78-34, the savings will be a little more significant.”

Dobson Brothers recently completed a $1.9 million RA project for the Nebraska Department of Roads (NDOR) on Highway 92 near Wahoo, Neb. It was a mill-and-fill project covering 4 miles of two-lane highway plus shoulders. A subcontractor, Dustrol Inc., milled 4 inches of asphalt down to the top of the concrete base and Dobson put 4 inches of asphalt back.

The first lift consisted of a 1-inch layer of a fine-graded mix. Next Dobson paved 3 inches of RA in two lifts.

“It was our idea to implement rubberized asphalt into the project,” Todd Schlueter said. He’s Dobson’s www.theasphaltpro.com | ASPHALT PRO 25

asphalt operations manager. “The reason we did it is that we saw some cost savings associated with modifying a base grade AC with rubber to get the higher grade binder without using a polymer. We did not modify the PG52-34 with polymer; we used rubber instead. The job required PG64-34, but we bumped it up to PG66-35 as determined by an independent testing lab.”

What’s more, the rubberized mix had a high recycled asphalt pavement (RAP) content—45 percent. Schlueter said Nebraska is known for a high RAP mix used for secondary highways. “Half the new road is the old road,” Schlueter said.

The RA offered NDOR cost savings. “Because it was a high-RAP mix, we were not adding a lot of AC back into the asphalt,” Schlueter said. “On this one I think NDOR probably saved $15,000 or $20,000. It wasn’t a significant amount on this project but can escalate on projects with lower RAP contents. We wanted to set a precedent so it will be considered on future projects.”

Dobson added 3.1 percent of new rubberized binder because the RAP provided a share of the needed AC. The total mix received approximately 5.5 percent binder. Dobson mixed in 10 percent rubber by weight of the new binder. “If you have 100 tons of virgin AC, we put in 10 tons of rubber,” Schlueter said.

Justin England, quality control/quality assurance (QC/QA) manager for Dobson Brothers, explained how the asphalt rubber plant performed. “The blending unit is one portable unit that holds a control house, a rubber hopper, and a series of pumps and augers up to one blending vessel that you pump into,” he said. “From there, in one continuous motion, we bring the PG52-34 and the crumb rubber and mix them and take the mixture out to put it into the reaction tank.

“As we’re running AC into the blending pot, we can pump AC out at the same time as it’s mixing,” England said. “When you bring it to the top, you’ve got a 3,500-rpm motor with whip on it that blends it before it gets to the bottom of the blending 26 January 2013

Blend Rubber

An asphalt rubber blending plant will feature two main components—the mixing chamber and the reaction tank. The contractors mentioned in this article used AR blending plants from CEI Enterprises, Albuquerque, N.M. To create a successful AR mix the producer first feeds ground tire rubber (GTR) into the crumb rubber hopper at regular intervals during production. The secret to success, as Wade Malone points out in the article, is consistent production at a set rate that matches your hot mix asphalt (HMA) plant production rate.

With the CEI plant, an air canon in the crumb rubber hopper is designed to keep material flowing freely to a screw conveyor, which controls the volume going to the mixing chamber. Load cells measure the material by weight. At the same time, an asphalt cement (AC) pump with a variable frequency drive

pot. Then once it hits the bottom of the blending pot it gets transferred to the reaction tank.”

The reaction tank, or holding tank, is a second portable unit. It’s a 30,000-gallon tank split into two halves of 15,000 gallons each. In that tank, the rubber reacts with the virgin AC and the mix is held for a specified period of time while it cures. The tank is heated and has agitators at the bottom and mid-level so that the material rotates from the bottom up to the top and then back down the sides in one continuous motion.

Dobson used belly-dump trucks to lay down a windrow of asphalt in front of a Cedarapids paver with a Lincoln windrow pickup machine.

(VFD) sends virgin AC to the mixing chamber. That’s where the GTR and AC meet up.

A high shear mixer running at a speed of 3,400 revolutions per minute homogenizes the crumb rubber particles with the liquid asphalt. As the materials are mixed, a pump sends the blending materials to a reaction tank. During the mixing process, fresh GTR and virgin AC continue to flow into the chamber.

The compartmentalized reaction tank moves the blended mix across agitating augers mounted horizontally so that the crumb rubber remains in suspension and the new mix enters the tank at one end and the aged mix exits the tank at the other. Vent condensers handle external cooling and Smog Hogs control final blue smoke fumes. A mass flow meter measures supply from the reaction tank to the plant for delivery of GTR-modified AC.

The two driving lanes were paved separately from the shoulders, which required a different asphalt mix.

The asphalt left the Gencor drum at around 340oF, and Dobson paved it at approximately 300oF. The plant ran at about 180 tons per hour, which wasn’t full capacity, because trucking capacity was limited.

“Paving went pretty smoothly,” Schlueter said. “We received a smoothness bonus on this project.

We received 106 percent pay factor for the smoothness on the Highway 92 section. We’ve done several rubber projects in the past, but this was the first one that we’ve done to modify another binder up to a higher grade.”

“We received 106 percent pay factor for the smoothness on the Highway 92 section. We’ve done several rubber projects in the past, but this was the first one that we’ve done to modify another binder up to a higher grade.”— Todd Schlueter, Asphalt Operations Manager High temperatures

This past summer, Granite Construction Co., Watsonville, Calif., paved an RA project on Interstate 8, near the Mexico border not far from El Centro, Calif. The 10-mile, four-lane project was performed under contract to the California Department of Transportation (Caltrans) to test two warm-mix additives—Sasobit and Rediset. Both were used in rubberized mixes. The control mix was a regular gap-graded rubberized mix.

After milling out 0.23 feet on the mainline, Granite crews placed an AR seal coat, followed by coated chips.

That sort of treatment is often called a stress-absorbing membrane interlayer (SAMI). Depending on the location, Granite next paved the interstate with either 0.2 feet of rubberized hot mix or rubberized warm mix.

“We would grind out a lane, seal coat it and pave it back because we were not allowed to leave any unpaved surface after a shift,” Jim Marsolino said. He’s the project QC manager with Granite. A Cedarapids remix paver on tracks worked the driving lanes at 12 to 13 feet wide.

The shoulder sections were paved separately because they didn’t get the SAMI layer.

Granite set up its portable RA tank at the company’s El Centro location to pave the project. The contractor mixed four ingredients into the blending unit: virgin AC, 2.1 percent extender, and two types of rubber.

“You have 75 percent of the rubber that is scrap rubber and 25 percent is high-natural rubber,” Wade Malone said. He’s the rubber plants manager for Granite. High-natural rubber is a higher grade of rubber that Caltrans requires.

The four ingredients are blended at 410oF, and then pumped to a reaction 28 January 2013

tank. Either an agitator or an auger keeps rubber particles suspended in the reaction tank. Caltrans requires that the rubberized mix react and cure in the reaction tank for a 45-minute period. Binder content on the job was high, at 7.6 percent, and 20 percent of that was rubber, Malone said.

For other contractors starting up a rubberized plant, watching production is key. “You need to be careful of your production demands and what you think your future demands will be,” Malone said. “You definitely have to have the correct size and number of reaction tanks to stay in front of the hot mix plant.

“For our El Centro project, we had two 50-ton reaction tanks and we ran the asphalt plant at an average of 200 to 225 tons per hour,” Malone said. “Some of our rubber plants have three reaction tanks. We used a Gencor hot plant with a top capacity of 400 TPH. CEI Enterprises made the asphalt rubber equipment.

“You can run into a problem when you’re in production and you can’t use your blended material until you have the 45-minute cure,” Malone said.

“It’s specific to each mix design and aggregate source. The higher your binder content, the more rubberized binder you need to mix with it.”

Production had to be closely monitored because Caltrans regulates the viscosities of the binder. While the rubberized binder is heated in the reaction tank, its viscosity increases up to a certain point. “As soon as you get a descending reading, the reaction period is finished,” Marsolino said. “It’s ready for use.”

Caltrans specs call for the viscosity of the interlayer binder to be 1,500 to 2,500 centipoises. And for the paving asphalt, the binder can range between 1,500 and 4,000 centipoises.

“The spec on this is really detailed,” Marsolino said. “Once the binder is ready for use, you have to ship it or use it within a certain period of time.

And once you get a descending reading, you can’t leave the heat on. You are allowed three reheat cycles to keep the viscosity within spec.”

Plus the SAMI layer used PG64-16 and the rubberized hot mix used a different grade, PG70-10. “We had to coordinate pretty closely because we had limited tank space,” Marsolino said. “We had to make what was needed for the next day’s shift for the interlayer, and get it shipped out before we started making the rubberized binder for the hot mix.

“It was very challenging for us to make sure we were cleaning the tanks out from the seal coat binder before we started producing the binder for the warm mix. And at the end of the day, we had to pave back everything that had been ground out.”

Marsolino said he didn’t notice much difference between hot mix and warm mix. All three mixes— the two warm technologies and the hot—were made at about 310oF in the drum. (Editor’s Note: These were tests of the WMA additives. AsphaltPro staff does not consider these mix temperatures examples of successful warm mixes.)

“We’d mix at 310 and the job site was a half hour away,” Marsolino said. “The surface temperature out there ranged up to 150oF, and we were seeing minimal loss of temperature in the asphalt. We tried mixing the rubberized warm mix at a little bit lower temperature, but then we were not getting the compaction results that we hoped to get. So we ended up raising the temperature to a point similar to the hot mix.”

George Way of RAF predicts that the demand for RA will continue to grow for several reasons. The availability of polymer may be limited due to international supply and highway budgets continue to tighten. Meanwhile, with pavements growing old, RA makes a surface treatment solution with cost savings implications for pavement preservation.

Buy Smart

Purchasing a plant doesn’t have to be scary

By Cliff Mansfield

30 January 2013

S

omeone placing 200,000 tons of asphalt a year is ripe for expanding his business into the production arena. If you’ve been buying hot mix from the local supplier for years and now wish to start producing it for yourself—perhaps even sell it commercially—you’ve made the first of many important decisions. Now you need to think about asphalt cement (AC) plant type, style, size, brand, AC tank size, storage silo size, type of pollution controls and your budget. The list goes on, but let’s think about budget.

For a recent project with a family owned company in Hawaii, my primary goal was to find a used plant that fit into their budget constraints. Plant transportation to Hawaii is quite expensive, adding more than $100,000 to the costs. For this particular client, I needed to find them a low tonnage plant that would supply about 1,700 tons per day.

Cost was high on the list of priorities.

Assuming you have a place to put a plant and a good aggregate source, the first couple of choices you’ll have to make are type and style. I say bigger is always better, but a site with 3 acres is about the minimum that is “comfortable” for a plant footprint. Now, do you want a batch plant or a drum plant? Should it be portable or stationary?

I’ve shared the definitions of batch and drum plants in the pages of AsphaltPro before, but I’ll summarize the basics quickly again. In my opinion, a batch plant is the best choice for an operation where the plant will be called upon to make various blend mixes in the same operational “run” or if the plant will be doing a lot of starting and stopping in the course of the day. A drum plant is the correct plant for a company not concerned with switching back and forth to various mixes, but foresees the luxury of long production runs. Another consideration with batch plants is that they use many more moving parts than drum plants, thus they can be more expensive per ton to operate and have higher year-end maintenance costs.

I’ve also shared basic definitions of the styles of asphalt plants in these pages. To summarize once again, you know you want a portable plant if you need to move it “frequently.” Of course, what determines frequency?

If you only need to move your plant once every few years, then it is possible that the cost of moving the plant is considerably less than the cost of portability on the original order. I recommend that companies in this category consider buying a skid-mounted plant with flexible wiring like SO cord equipped with quick disconnects. Companies that plan to move their plants several times a year must purchase a portable facility. When looking at these units, check into self-erect silo/drag combinations.

As mentioned at the outset, once a contractor is laying 200,000 tons a year, he’s well on his way to needing his own source of mix. This means you need to figure out how much production you’ll need—what size plant should you look into? One of the fundamental mistakes I see companies make is trying to size the plant to their highest production days. Avoid this. I recommend that a plant be sized to the average for a company’s busiest month. Plant sizing is a function of market demand.

Buying an asphalt plant is a big step and the best advice I can think of is to be thorough. Research your market and know your potential customer.

Ask yourself the tough questions, such as what it will take to get business away from those who will be your competitors. What do you have to offer customers that the other guy doesn’t? If you plan to buy a plant to service your own paving operation, how will a plant aid in that operation Will it give you access to mixes you can’t get elsewhere?

Do you have enough yearly volume to support the payments on such a large investment?

Once you have a thorough understanding of these issues, you’re ready to proceed with the purchase of a plant if it’s warranted. Be just as thorough in your investigations of potential pieces of equipment. Money spent on plant appraisals and consulting help could turn out to be the best investment you make.

Finally, start on the Air Quality Permit process the minute you decide to get a plant. This process, under adverse conditions, can drag on for months. Under some situations it can kill the entire project. Know your prospects for getting all the needed permits first.

Cliff Mansfield is the proprietor of C.M. Consulting, Odell, Ore. For more information, contact him at (541) 352-7942 or cmconsulting@hotmail.com.

How Much Do You Want?

If you feel that you can sell 3,000 tons of mix per day 10 percent of the time and 1,000 tons per day the rest of the production season, a 200-TPH plant is more appropriate than a 400TPH unit. Plant sizing is a function of market demand. In general, a plant is most efficient when it’s running at about 80 percent of its rated capacity, and components and controls last longer when they aren’t stopped and re-started constantly. Remember that a smaller plant with lots of storage capacity can often produce as much mix on a given day as a larger plant because it might not have to stop while waiting for trucks, while the larger plant fills its silo in a hurry and then must wait for the silo level to drop. Dead time away from productivity adds to the cost per ton of mix.

www.theasphaltpro.com | ASPHALT PRO 31

Rubber Tires Grip Winding Roads

By Tom Kuennen

32 January 2013

T

he winding two-lane blacktop roads of New England can make it difficult for a crew to place asphalt at a swift pace.

That’s why Connecticut road contractor Cocchiola Paving, Inc., of Oakville, used a rubber-tired paver on a recent project.

“The rubber tires make it easy to move the paver on the roads,” Domingos Almeida, vice president of Cocchiola Paving said.

“We can travel back and forth on the job site without making a mess.”

In addition to the narrow, winding roads, the abundance of small intersections in semi-rural New England make the maneuverability of the 8-foot, rubbertired Vision 5103-2 ideal for the back-and-forth paving of asphalt intersections. “If you do this with tracks they will lift the asphalt up,” Almeida said. “I’ve tried them before and I don’t like them for what we do.”

After paving one 11-foot pass under shady trees to the bottom of a hill, Cocchiola’s operator put the paver in reverse and backed up the length of the project for the next pass, driving it as if it were an automobile.

Many of the roads Cocchiola paves by necessity don’t have shoulders, with pavements flanked by dirt or sand drop-offs.

Almeida says that the rubber tires give the paver the higher “flotation” it needs to keep from getting bogged down in unconsolidated shoulders. Almeida said he preferred the rubber tires for maintaining traction in such situations.

In late June 2012, on the milled surface of Barn Hill Road in Monroe Township, Cocchiola was reestablishing crown, placing a 2-inch hot-mix asphalt (HMA) mix and compacting it to 1.5 to 1.75 inches, depending on the surface.

Intermediate compaction was being accomplished by Cocchiola’s Hamm HD O70V roller in the vibratory mode.

Almeida said Cocchiola doesn’t do high-level interstate-type paving, but specializes in road and commercial work in western Connecticut. It’s a family owned and operated paving and construction company with over six decades of experience in state, municipal and private projects.

34 January 2013

Previous Page: The Vision 5103-2 from Vogele features rubber tires that give the Cocchiola operator the “flotation” he needs to keep from getting bogged down in unconsolidated shoulders along the winding Northeast roads on the milled surface of Barn Hill Road in Monroe Township. ABOVE: Jim Robinson from Monroe Township visits the jobsite. ABOVE: The crew used a Hamm HD 070V for compaction. The unit combines oscillation and vibration in the drums.

Here’s How to Apply Release Agents At the plant or at the paving site, proper asphalt release agent use saves money

By Sandy Lender

The spray system for the in-the-field innovation that R&D’s client developed uses one nozzle at the top of the miller’s conveyor to deliver diluted release agent to the truck beds before they accept millings.

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se of diesel fuel as a cleaner is not only expensive, harmful to the properties of asphalt mix and harmful to the environment; it’s illegal in all 50 states. That’s why many companies have spent time and money designing release agents that clean tools and keep sticky mixes from piling up in truck beds or on plant equipment. It’s why departments of transportation and independent testing labs have dedicated hours and staff to testing the safety and efficacy of different agents asphalt professionals can purchase. It’s also why AsphaltPro is going to share some concepts and clever delivery methods with readers here.

Global Barrier Coatings, Inc., San Clemente, Calif., recently completed the testing process for its 38 January 2013

product, GBC ARA, which is a vegetable-based agent containing no water. Mike Siebes of Global said the agent has the viscosity of olive oil and one pint is sufficient for a dump bed to carry three loads of mix without getting carryback. The more the GBC ARA is used in the truck bed, the more the bed becomes saturated with the product and the slippier it gets.

Econopave 1000, a soap-based product from R&D Asphalt Products, Ft. Wayne, Ind., works much the same way. Dave Fogg of R&D explained that the more often the product is used, the more effective it becomes because it builds a bond with the truck bed or other equipment it’s applied to. In fact, he gave an example of a client in Cincinnati who will remain anonymous using

What’s Available

Many chemical companies offer release agents for use in environmentally friendly scenarios. AsphaltPro thanks the sources who took time to visit with us for this article and lists some of their particulars for you.

Global Barrier Coatings, Inc., San Clemente, Calif.

(949) 542-7440 Main Product: GBC ARA Vegetable-based 5-gallon pails; 55-gallon barrels; 275-gallon totes Flash Point = 540oF NFPA Hazard Codes = Flammability 0; Reactivity 0 R&D Asphalt Products, Ft. Wayne, Ind. (260) 443-5433 Main Product: Econopave 1000 Soap-based 55-gallon drums; 275-gallon totes Flash Point = 365oF NFPA Hazard Codes = Health 1; Flammability 0; Reactivity 0 Rushing Enterprises, Inc., Headland, Ala. (800) 654-8030 Main Product: AP550-10 Bio Pure Asphalt Release Vegetable oil methyl esterbased 5-gallon; 55-gallon; 275-gallon; bulk truck loads Flash Point = 300oF NFPA Hazard Codes = Health 1; Reactivity 0

the Econopave 1000 in an innovative fashion to make sure trucks get that bond going.

He explained that the company set up a spray system at the end of the milling machine’s conveyor. The water for keeping the machine’s drum cool is already on board, as is a water pump, so they set up a hose and set the pump to meter a set amount of release agent mixed with water to a spray system at the pulley. The milling machine operator flips the switch that sprays release agent from a simple nozzle directed into the empty truck before it begins accepting millings.

“Since they started using polymer-modified asphalt mixes, they couldn’t double-haul on any project,” Fogg said. “They weren’t bidding any projects that way. Now they’ve done a lot of projects using Econopave with the mill with the spray system set up on it and the beds have built up that bond to have a good coating in the beds.”

Another asphalt professional that uses innovative practices to deliver release agent in the field is APAC Midsouth. As John Ball reported in the January 2012 issue, the crew assembled a spray system from the back of a flatbed service truck.

They equipped a 16-foot aluminum straight edge with a PVC pipe and four nozzles from a roller to make a spray bar. They put an electric pump in between the pump and the release agent from the tank through a hose to the pipe. A worker in the service truck bed swung the spray bar out when it was time to lubricate a truck.

The actual spray section of the spray bar is eight feet and the nozzles direct the fan of spray straight down into the truck. The release agent APACSouth uses is AP55010 Bio Pure Asphalt Release, which is product based on a vegetable oil methyl ester from Rushing Enterprises, Headland, Ala. Notice that both of these examples mention the direction of the spray nozzles. Spray systems are one way to coat haul trucks, whether at the plant or in the field, and directing the spray so that it coats only what you want coated is important to avoid wasting product and overspray. Marty Rushing of Rushing Enterprises actually prefers hand spraying.

“Most larger hot plants on the west coast, where I am most experienced, apply by hand. Auto spray systems have not fared well.”

One auto spray system that Siebes of Global Barrier has seen success with is a timed system used in conjunction with the slat conveyor at the plant. That’s right: more than the haul trucks need release agent. Keeping material www.theasphaltpro.com | ASPHALT PRO 39

The spray bar for the in-the-field spray system APAC Midsouth created uses a 16-foot aluminum straight-edge and four nozzles from a roller.

from building up on plant components can extend component life.

Why spend $60,000 to $100,000 on a new chain if you could set up a sprayer unit and a tote of release agent on a timer at the base of your 36-inch conveyor? This is a practice the folks at Global Barrier and Astec Industries recommend.

40 January 2013

Keep in mind that some products will require mixing, which means you’re not always comparing apples to apples when looking at prices or shipping costs. Fogg of R&D sells his product in a concentrate, which means you’re not paying to ship water. You do want to keep the product agitated once it’s mixed, though. If

you plan to put a release agent in a roller’s water tank to use on drums to avoid material pickup, consider how much time the roller, thus the tank, will spend sitting before vibration and regular work agitate the solution.

As mentioned above, diesel fuel compromises asphalt mix. The diesel liquefies the asphalt, which strips it from the aggregate, leaving the contractor with areas in the mat that are substandard. Testing labs check into this before approving release agents for use with asphalt material.

State DOTs also chime in. Fogg listed states such as Ohio, Virginia, Maryland, Massachusetts, Texas and Indiana require chemical companies to use independent testing labs for verification of products; the labs then forward the results to the state officials so the products can be listed as approved for use. Chemical companies will provide an MSDS for their asphalt release agents and contractors can request to see this before purchasing products.

Increase Your RAP/RAS Use No matter what type of HMA plant you have, these tips can increase your recycle while decreasing your stress

By Steve Elam, Stansteel/ Hotmix Parts

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any state departments of transportation (DOTs) and other government units recognize the value, importance and quality of pavements that can be constructed using more recycled products. For a number of years, the recycle percentages DOTs allowed contractors to use were kept at a minimum because there wasn’t a good known record of the performance of recycled asphalt pavement (RAP). Today, hundreds of millions of tons of RAP are used at plant sites throughout North America and we know the value of using ever increasing percentages of RAP and more recently recycled asphalt shingles (RAS).

How can you begin to take advantage of this increasing trend? You don’t have to buy an all new plant in order to run more RAP. In most cases, modifications to an existing plant can yield good performance with a lower net cost of total production than the spending dollars on a new plant, new permit work, new infrastructure and site installation. Here are some practical ways to improve and increase the use of RAP on the industry’s two main types of plants: the batch plant and the continuous type drum mixer plant.

How to Modify Your Batch Plant for Recycle

With many batch plants still in use around the world and in North America, it’s important to note that these will show great production rates and run significant amounts of RAP depending on the way they are equipped. Here are a few options: OPTION 1 The original batch plant entry method was to install a RAP system and feed the RAP material to the weigh bucket. In

42 January 2013

many cases, producers limited themselves to 10 to 15 percent RAP with this method. This required additional venting capability on the weigh box to accommodate the steam produced when cold RAP, especially in higher percentages, combined with heated aggregates. Air had to be robbed from the plant air system in order to vent the steam. Consequently, some contractors decided to either increase their baghouse and air system size or add a separate baghouse unit to vent the extra steam. Depending upon the availability of RAP and what the producer is trying to accomplish, this can help them increase their RAP percentages by 5 or 10%.

OPTION 2 In other cases, producers have looked at feeding the RAP in the bucket elevator, similar to the drum process. In doing this, they would install a belt scale on both the virgin belt feed to the dryer and a belt scale on the RAP feed to the bucket elevator. This way, they could gauge the percentage, assuming they were going across the vibrating screen deck. But in most cases, these contractors would limit themselves to about 15 to 20 percent RAP use. This had to be varied depending upon moisture and other conditions, but it seemed the rule of thumb was the operators could run approximately 15 to 20 percent RAP without blinding the screen and they were also gaining some early heat transfer by the RAP being in contact with the virgin aggregate, up the bucket elevator, across the screen deck and through the process.

OPTION 3 Some producers have experimented with heating RAP prior to going to the tower as well as weighing material back into the pugmill. These contractors often developed their

are several different steps to take to increase the recycle caown method of having a third scale so they could weigh up pabilities on most continuous drum plants. the aggregate and weigh up the RAP in a scale adjacent to OPTION 1 the tower and convey it into the pugmill either by a screw In the first stage of parallel flow drum mixers, the drum mixer conveyor or a belt feeder. A third scale would weigh the shell was made similarly to the shell of a batch plant. As an exliquid asphalt into the process. In this arrangement, many ample, if the batch plant dryer was 28 feet long, the drum mix contractors produced at the 30 to 35 percent range. unit was 28 feet long. Of course, in some of the initial drum OPTION 4 mixers, there actually was an intent to leave moisture in the Another method that a number of producers accommaterial, leading to the name of “turbulent mass” and othplished with a batch plant was running aggregate and RAP er foaming reactions from lower temperature mix and some feed like a continuous drum plant and actually bypassing that still held water as a precursor to the warm mix asphalts the main vibrating screen. They would combine the virgin of today. aggregate and the RAP in the bucket elevator and then With the parallel flow drum mix, one of the most critical the bucket elevator discharge would bypass the screen aspects of successful mix production is to get the aggregate deck and just go into the number one hot bin. The materidry and superheated before it comes in contact with the RAP als would be batched out of that to the weigh box and the weigh box would contain both RAP and virgin aggregate. At that point, it would be weighed and discharged into the pugmill and then the liquid asphalt added at a reduced percentage. In this arrangement, a number of contractors have reported running 25 to 30 percent RAP. OPTION 5 Finally, we believe the ultimate upgrade to a batch plant facility would be the ad1 3 dition of a device such as the Rotary Re2 4 cycle Mixer®. This addition would convert the plant into a continuous mode and bypass the weighing, batching and mixing altogether on the tower. A bypass permits the superheated aggregate material to go directly to the rotary mixer and the RAP feed would go to the mixer as well. These would be combined with the superheated aggregate and producers have reported running 1. This parallel flow Boeing drum plant was in good condition but didn’t have recycle capability.

40, 45 and 50 percent in a continuous 2. After the team from Stansteel/Hotmix Parts worked with the company, the plant features roumanner. With this process, the entire tine operation of 35 to 40 percent RAP. It has the same drum shell and burner, has been convertfeed and proportioning side of the ed to a counterflow dyer with elevated feeding and a Rotary Recycle Mixer and primary knockplant must be automated to run just like out box. 3. This old 35-foot parallel flow drum mixer didn’t use RAP until the company made some adjustments. They extended the length of the counterflow drum and added high RAP caa drum mixer with all of the belt feeders pability in an environmentally sensitive area. 4. This plant had been limited to 7 percent RAP. Now calibrated, an accurate liquid asphalt with a Rotary Recycle Mixer in place and a plant conversion, the company sees 35 percent RAP metering system, belt scales and plant mixes and big savings on 200,000 tons per year estimates. See Figures 1 and 2 for numbers.OPinterlocks to assure quality control. It POSITE PAGE: Counterflow technology allows this producer to run high percentages of RAP. can also be set up to alternately run the batch tower for special mixes and then material. While there is some convective heat transfer takrun the larger production runs and the high RAP usage runs through the rotary mixing plant. This process has been proven ing place with the RAP from the heated gases in the drum for more than 20 years and millions tons of production. mixer, it is most important that the virgin aggregate be superheated as efficiently as possible. As the virgin aggregate is combining, it is transferring its energy and giving up heat to How to Modify Your Continuous and the RAP material. The most common problem with the paralDrum Mix Designs for Recycle lel flow drum mixers is the exhaust temperatures going from There are many contractors with all ages of continuous or the drum mixer to the baghouse are elevated; temperatures drum mix plants that have had varying degrees of success can be anywhere from 10 to 100 degrees higher than the mix with their ability to recycle. Many of the initial drum mixtemperature coming out the discharge of the parallel flow ers had recycling as a secondary consideration rather than drum mixer. a primary or critical ingredient for making up the mix. There www.theasphaltpro.com | ASPHALT PRO 43

ABOVE: Figure 1. Before this anonymous company installed a rotary mixer, they ran RAP at 7 percent and saw a reasonable savings per ton on a yearly basis.

ABOVE: Figure 2. After this anonymous company installed a rotary mixer, they ran RAP at 35 percent and saw a significant increase in savings per ton on a yearly basis.

44 January 2013

In a number of cases with shorter parallel flow drums that did not have the drying, heating and flighting equipment available, the exhaust temperature would become so elevated that it would either damage the bags in the baghouse or carry over liquid asphalt byproducts and fines to eventually plug up the bags. Therefore, production rates and RAP percentages were limited.

Also, many parallel flow drum mixers didn’t have a primary dust collector; it wasn’t required because the material fines would get coated by the liquid asphalt in the parallel flow drum and cut down on the loading of dust going to the baghouse collector. When efforts were made to reduce or eliminate liquid asphalt exposure in the mixing zone, high volumes of fines made it to the dust collection systems; this negatively affected production rates.

Several items dramatically helped increase the RAP percentages using a parallel flow drum mixer. First of all, you want excellent combustion flighting in the unit to take advantage of releasing the energy from the burner in the combustion zone and not carry extra heat and combustion past the critical zone. There should be no material impinging the flame and decreasing either fuel efficiency or proper combustion.

The next item is that the mixing can often be done in the last portion of the drum mixer. Originally, the recycle entry collars on drum mixers were near the center of the unit. As parallel flow drums developed and evolved over the years, the center collars kept moving closer to the discharge end and the liquid asphalt pipes shortened up from the original length of 12 to 14 feet down to 7 or 8 feet in the discharge breeching. Both of the items allowed the virgin aggregate to be superheated and perform the conductive heating on the RAP as well as mixing zone of the parallel flow drum mixer.

Finally, with one of the latest advantages of parallel flow drum is the ability to have foamed asphalt and mix at lower temperatures with warm mix so as to decrease the exhaust hot gas temperature and also improve the coating of the aggregates and RAP combined.

The parallel flow drums evolved to include an expanded combustion zone on the inlet area to optimize combustion and burner efficiency. The drum mixers also lengthened substantially. As an example, the early models of parallel flow drum mixers were perhaps 28 or even 30 feet in length. The later models were up to 50 and 55 feet in length. With this, you get more combustion volume, more veiling and flighting area and heat transfer zone before the virgin aggregate mixed with the RAP, ultimately enabling higher RAP use.

OPTION 2 With the counterflow drum mix and counterflow drying technology, the aggregates are increasingly heated as they are approaching the burner flame envelope, a process that lends itself quite well to making the superheated aggregates that are necessary for raising the temperature of the RAP. There are two main methods of counterflow drying technology with drum mixing. One includes having a drying unit with an extended nose burner; 46 January 2013

the other involves heating and drying in one vessel and mixing and blending in a separate vessel.

With the counterflow single drum technology, the aggregates are superheated in one area in front of the flame and then the recycle is entered in a separate mixing zone. At that point, the recycle material, dust, liquid asphalt and other ingredients are added in the zone past the burner flame. One of the best ways of improving the ability to use RAP in this venue is having a much longer zone to perform transfer of virgin and RAP material.

We have seen many approaches tried, but we believe that ultimately extended length and heat surface areas are the most important part of the process. Also, it is important that the dryer be of a large enough diameter to heat and dry the materials without having the air moving through the drying vessel so as not to carry out too much dust and fines.

Another important aspect in using a counterflow drying technology is having a very good primary dust collector. As compared to the parallel flow, none of the dust particles are coated in the unit so they are picked up in the air stream as it is moved through the dryer. If the dryer is too small in diameter, larger particles and even aggregate materials can be pulled out of the counterflow unit into the primary and even secondary collectors. Thus, having more and larger dust handling equipment to get the material back to the process is important.

A proven and effective technology is using a properly designed counterflow dryer unit. In this scenario, the drying unit discharges the superheated aggregate into a separate mixing vessel such as the Rotary Recycle Mixer. The entry point into the mixer allows the introduction of all types of other ingredients such as RAP, RAS, recycle glass, special additives, liquid asphalt and dust. It’s not uncommon to run 45 to 50 percent recycle or more by using this method.

OPTION 3 The two drum mix technologies can be merged. There are thousands of parallel flow drum mixers throughout the world.

Many of their owners want to take advantage of their investment in equipment from the drum/dryer frame, trunnions, drive motors to other components. If a company wants to convert much of their existing equipment with proper analysis and engineering, a system can often be designed to use this equipment even including their dryer/drum shell and just modify the direction of flow, the burner location and other components.

With the advent of warm mix, it significantly helps the contractor make more mix at a lower cost and have less environmental impact and less smoking of any materials. It is important to know and understand all aspects of the plant when attempting to retrofit or convert any of these style units.

Steve Elam is with Hotmix Parts/Stansteel. For more information, contact him at (800) 826-0223 or selam@hotmixparts.com.

www.theasphaltpro.com | ASPHALT PRO 47

48 April/May 2012

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people you should know

Meet AEM’s 2013 Chairman Stu Levenick • Caterpillar Advanced Management Program, 1992 • Brookings, Inside Washington: Business & Public Policy, 1993 • Massachusetts Institute of Technology, Sloan Fellow, M.S., Management, 1995

Title & Company/Organization: Group President, Customer & Dealer Support, Caterpillar Inc. Age: 59 Brief Job Description: Mr. Levenick is responsible for customer and dealer support for Caterpillar Inc., which includes administration of Caterpillar’s worldwide dealer organization, Europe-Africa-Middle East, Americas, and Asia Pacific distribution divisions, remanufacturing and components division, customer services support division, and parts distribution and logistics.

Years In The Construction Industry: 35 Area Of Expertise: He has a strong background in marketing and general management, as well as broad global experience in the United States, Canada, Russia, Asia Pacific and Japan. His previous executive office responsibilities included Asia Pacific marketing, Asia Pacific operations, global purchasing, Americas manufacturing operations, global mining, and quarry & specialty industries.

Education: • University of Illinois, B.S., Forestry, 1976 • Caterpillar Marketing Training Program, 1977 50 January 2013

Community Involvement: • Executive Director – U.S. Chamber of Commerce • Chairman - Association of Equipment Manufacturers, Washington • Board of Directors - Heart of Illinois United Way (term expired 2011) • University of Illinois Varsity “I” Association • University of Illinois Foundation Brief Professional Background: • Joined Caterpillar as a sales and marketing development representative in 1977 • Served in various management positions in marketing, commercial management and product source planning • Became a division manager in 1989 in Product Source Planning, General Offices • Became regional manager for Cat Asia Pte. Ltd. in 1995 • Became general manager for company operations in the Commonwealth of Independent States (CIS) in 1998 • In 2001, served as vice president of Caterpillar’s Asia Pacific Division and chairman of Shin Caterpillar Mitsubishi Ltd. (SCM), formerly a Tokyo, Japan-based joint venture between Caterpillar and Mitsubishi Heavy Industries Ltd. – now Caterpillar Japan Ltd. (CJL) • Named group president and Executive Office member of Caterpillar Inc. July 1, 2004 Biggest Challenge I See For The Construction Industry During My Year As

By AsphaltPro Staff

Aem Chairman (and my goal toward assisting in meeting the challenge): There are a number of things we will be focused on in 2013 as part of AEM’s advocacy role, including our “I Make America Campaign.” Obviously, dramatically increasing jobs for those who grow and build America is our top priority and a huge challenge. We can do this by promoting pro-manufacturing policies in the United States. One opportunity is through strong support of a comprehensive and fully funded longterm infrastructure solution in the United States. Investment in transportation, energy and telecom infrastructure enables growth and drives enhanced competitiveness in the global marketplace.

Congress recently passed a new twoyear surface transportation bill that will authorize over $100 billion for federal highway, rail and transit programs in all 50 states. While this is an important victory and will help ensure that states and contractors have the certainty they need to make investments in the near term, the long-term revenue needs of our transportation system is still an issue that must be addressed in the next two years. We must continue to work with our policy makers to ensure that they understand the role of a competitive U.S. manufacturing base.

What I Look Forward To Most For My Year As Chairman: I look forward to working with our AEM members and aligned associations to address the challenges we all face as manufacturers in an increasingly global economy.

We have a diverse membership made up of more than 890 companies representing 200+ product lines. Our members range from small to very large, but we all face similar challenges. I look forward to leveraging our collaborative partnership to make a difference for all of us. Our collective strength can have a real impact if we work together.

equipment gallery

Top 10 New Asphalt Products

By AsphaltPro Staff

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sphaltPro Magazine is known for its howto editorial content. Readers spend time in our pages to learn. You also peruse our Equipment Gallery and Here’s How It Works (HHIW) departments where we showcase the newest iron, equipment and technology for complete product education. More than a regurgitation of original equipment manufacturers’ (OEMs’) product releases, these popular columns give an in-depth look at new equipment, parts and software that make a job easier for asphalt and aggregate industry professionals. During the past year, the AsphaltPro staff has been keeping track of the most interesting new products coming into those departments and we’ve made a list for you.

As we gear up for a trade show or approach a new year, companies often announce new products or upgrades to existing products. Some of those innovations sneak in during the middle of the year when you might overlook them. To bring a few of our favorites to your attention, we’ve compiled the Top 10 New Asphalt Products of the past year. It’s true that 2012 saw some cool uses of old-school technology, and you can revisit any of those stories at the www.

TheAsphaltPro.com website, but we’re going to focus on only the new for right now.

A number of OEMs like Roadtec in Chattanooga, and Caterpillar in Peoria, Ill., updated engines in 2012 in the race toward Tier 4 final compliance. Companies like Allmand Bros., Inc., Holdredge, Neb., and Atlas Copco, Commerce City, Colo., made modifications to heater and generator trailers, respectively. But these changes to existing equipment, while useful to asphalt and aggregate professionals, didn’t qualify as “new” products. Check out the following pages for a listing of the top 10 new products for 2012 that your AsphaltPro staff found of enough interest and benefit for the asphalt community that we needed to recall them for you.

We’re dedicated to our producer readers so we’ll start with new products that influence their bottom line directly and expand from there.

52 January 2013

1 - Perma Stor™ Loadout System Maxam introduced its Perma Stor™ hotmix silos during the World of Asphalt tradeshow to replace bintop conveyors.

The silos are designed to automatically evacuate all oxygen from the silo upon shutdown, eliminating the oxidation and coking that typically takes place in the loadout system. Inert gas displaces air in the silo ad mix voids, and a liquid seal is formed at the discharge gate to ensure no air seeps in.

Maxam’s exclusive shuttle Transporter™ eliminates all bintop conveyors and the requirement to have a batcher on each silo. This cost-saving and maintenance-reducing design eliminates oblique movement, is easily vented to eliminate blue smoke and can be retrofitted to other manufacturers’ silos.

The stationary batcher is affixed to the discharge end of the main dragslat conveyor. The Transporter sits beneath that and shuttle between silos on a track as less than normal walking speed. By adding a crossover gentry, the system can accommodate up to 10 silos over two truck scales or 15 silos over three scales. It takes 12 horsepower to operate a 10-silo system at 500 tons per hour.

Maxam’s Troo Loc™ double seal gates seal the silo and batcher openings when not loading, providing safety and preventing blue smoke from escaping. Touch screen controls are automatic. Check out the Here’s How it Works feature on page 72 of the June/July 2012 issue of AsphaltPro or online at www.TheAsphaltPro.com.

For more information, contact Maxam at (800) 292-6070.

Tell them you saw it in AsphaltPro Magazine.

2 - EX Series Drum Asphalt Drum Mixers, Inc., Huntertown, Ind., introduced its EX Series asphalt plants at the World of Asphalt tradeshow.

The new single-drum counterflow plants offer a compact design for contractors with low to medium product needs.

They produce 100 to 425 tons per hour, boast long ag-

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gregate drying and mixing times, and can process high percentages of RAP. Using counterflow technology, the EX Series has separate drying and mixing zones to achieve the maximum level of heat transfer and fuel efficiency. ADM designed the system to introduce residual gases back to the drum’s combustion zone. See the Here’s How it Works department on page 60 for more information.

The plants are available in portable or stationery versions. A wide range of components further customizes each plant for particular customer needs.

For more information, contact ADM at (260) 637-5729 or sales@admasphaltplants.com. Tell them you saw it in AsphaltPro Magazine.

3 - Voyager Plant

Dillman, a division of Astec, introduced its Dillman Voyager plant during the 2012 World of Asphalt tradeshow.

The plant is a portable, 200 tons per hour unit designed for producers who move several times per season.

It’s built around the Dillman unified drum and includes a 50-ton SEB to ensure a quick set-up without cranes. It includes a Whisper Jet 50 burner, a 34,000 cfm pulse jet baghouse and the Astec PMII control system.

For more information, contact Astec at (423) 867-4210.

Tell them you saw it in AsphaltPro Magazine.

4 - V-Flights

Astec, Inc., Chattanooga, introduced its v-flights in January of 2012. They are designed to replace the showering flights in drums and provide a greater uniformity of the aggregate veil during the drying process. AsphaltPro staff likes that the use of these flights should provide fuel savings of about 10 percent on a high RAP mix or opengraded mix produced with them in place.

Using the v-flights in conjunction with an optional variable frequency drive (VFD) should not only improve fuel efficiency and increase productivity, it should also add flexibility by extending the range of mixes that can be

produced without requiring the flights to be adjusted.

With the VFD, a plant operator should have the ability to control exhaust temperatures regardless of the mix design.

For the highest level of control, Astec also introduced a patent-pending stack temp control system package that incorporates the v-flights along with the VFD and PLC computer controls. The PLC is designed to automatically modulate the drum speed to maintain the set baghouse temperature. With the stack temp control system, producers should be able to accommodate more RAP in mixes.

The v-flights became standard in all new Astec drums and available as retrofits in January.

For more information, contact Astec at (423) 867-4210.

Tell them you saw it in AsphaltPro Magazine.

5 5 - DASH Controls Astec, Inc., Chattanooga, introduced the Dash Acquisition System Hub (DASH), which is a controls system for asphalt producers. It’s designed to gather information from all plants in an operation and make the data accessible via web browser, or flash-compatible device, in a real-time snapshot.

DASH is compatible with Astec control systems TCII, PMII and PMIII. The type of production data collected from each plant includes mix totals, raw material use, current production rates, moistures and mix temperature. Fuel consumption can be monitored for plants that have fuel meters connected to the plant control system. DASH displays data in interactive pie charts, bar charts, trend graphics and gauges.

DASH also collects sales data as each sales ticket is printed at each plant.

For more information, contact Astec at (423) 867-4210.

Tell them you saw it in AsphaltPro Magazine.

6 - Guardian Telematics

Roadtec, Chattanooga, introduced its Guardian telematics system that lets an operator find machine problems through either the display screen on the machine or remotely from a laptop or personal computer. The Guardian system also monitors machine performance and service requirements.

Roadtec first offered Guardian on its new e-Series Tier 4 milling machines. The telematics system can provide machine operating data such as productivity and time-to-service www.theasphaltpro.com | ASPHALT PRO 53

equipment gallery 6

powered by a 20.2-horsepower Kubota diesel engine that features ECOMODE, a system that automatically idles the engine to conserve fuel during inactivity.

The roller has a working width of 35.4 inches and delivers 3,822 pounds of centrifugal force at a frequency of 4,200 vibrations per minute. It’s equipped with Bomag’s intelligent vibration control and is built with travel motors within the vibratory drums. It includes a 26.4-gallon water tank and pressurized spray system.

For more information, contact Bomag at (309) 853-3571 or info.bomag@bomag.com. Tell them you saw it in AsphaltPro Magazine.

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intervals. If there’s a machine or engine fault, the system automatically sends an e-mail to the owner, or to Roadtec, reporting a problem.

The AsphaltPro staff likes that Guardian allows the operator to monitor fuel consumption, engine codes and other systems such as alarms, starting circuit, cutter function, water, conveyor speeds, propel functions, load control and hydraulics.

For more information, contact Roadtec at (423) 2650600. Tell them you saw it in AsphaltPro Magazine.

7 - BW90AD-5 Roller

BOMAG, Kewanee, Ill., introduced its BW90AD-5 tandem vibrator roller that features intuitive controls and is designed for small and medium asphalt compaction projects. It’s

8 - CR652RX Paver

7 54 January 2013

Terex®, Oklahoma City, introduced its new CR652RX remix anti-segregation system mainline paver early in the year. The company says it features the largest rubber tire drive in the industry to enhance tractive effort. This allows paving widths reaching up to 30 feet. While some of the features contractors saw on the Terex CR662RM RoadMix paver/MTV are on this new 10-foot rubber-tire paver, AsphaltPro staff likes the new spreading auger design.

The spreading auger uses two outboard drive motors mounted to the tactor’s rear bulkhead. Two five-foot long spread auger sections deliver material to the left and right sections of the screed. Each screw auger features its own speed control, allowing operators to independently adjust material flow to either side of the screed. The auger sections back up to each other, leaving no separation in the center.

This new drive and screw auger arrangement is to reduce centerline segregation and eliminate the need for reversing augers and the centerline gearbox.

Two sets of counter-rotating augers with interleafing flights uniformly draw down material from all areas of the hopper and re-bled the asphalt to produce a homogenous mix. The entire length of the auger shafts is lined to reduce wear.

Positioned at or below hopper wing level, the augers feature a constant 12-inch diameter, so material is pulled from directly above the full length of the shafts. A large,

variable-pitch design—10 inches at the front of the hopper to 12 inches just before the feed tunnel—channels material from the hopper to the spreading augers, which should increase truck exchange efficiency. The augers’ sloped design results in a larger opening at the end of the feed tunnel, which eliminates material build-up.

Upon exiting the hopper, asphalt enters the feed tunnel’s approximately 8-foot long mixing zone under the engine compartment. Here, 100 percent of the uniformly drawndown material is mixed in a figure-eight pattern by the pugmill-style mixers as it’s channeled to the spreading augers.

Standard receiving hopper capacity of the CR652RX paver is 16.7 tons. It’s designed to handle more than a 900-TPH capacity. A 260-horsepower Cummins QSB6.7 diesel engine powers the paver and contractors can choose among three screed models on the back end.

For more information, check out the Here’s How It Works department on page 80 in the March 2012 issue of AsphaltPro Magazine or at www.TheAsphaltPro.com.

Contact Terex’s Aron Sweeney at (605) 987-2603 or Aron.

Sweeney@terex.com. Tell them you saw it in AsphaltPro Magazine.

10 - JHT Jaw Crusher

Screen Machine Industries, Inc., introduced its JHT jaw track crusher. It’s based on the company’s JXT jaw crusher and has Cattron® remote control jaw adjustment, which the AsphaltPro staff likes for safety. It’s operated by a C-9 Tier III Caterpillar engine. The crusher is by Trio Engineered Products. The vibratory grizzly feeder is 40 inches long by 13 feet long. The feed hopper opening is 14 feet long.

For more information, contact (800) 837-3344 or email@ screenmachine.com. Tell them you saw it in AsphaltPro Magazine.

HM

9 Honorable Mention EZ-Flo RAS Scale

9 - Warrior 1400X Screen

Powerscreen of Dungannon, Northern Ireland, introduced the Powerscreen® Warrior 1400X in the fall of 2012. AsphaltPro staff likes the reduced engine running speed that offers a reduction in fuel consumption. The manufacturer states it saves up to 15 percent in fuel compared to past screens. You can see it receiving recycle from an XH500 impact crusher in the picture.

The 1400X screening machine can be fitted with either a Tier 3/Stage 3A Caterpillar C4.4 ATAAC 4-cylinder diesel engine developing 90kW at 1800 rpm or a Tier 4i/Stage 3B Caterpillar C4.4 4-cylinder diesel engine developing 82kW at 1800 rpm.

For more information, contact a local dealer by visiting www.powerscreen.com. Tell them you saw it in AsphaltPro Magazine.

Clarence Richard Company, Minneapolis, receives an honorable mention for the EZ-Flo RAS Scale because the AsphaltPro staff likes the concept, but felt it could be viewed as an improvement or derivation of an existing product, the EZ-Flo Scale. While the two products look nothing alike, they have a similar technology. The similar technology puts them in the running for a good product for our list, but not for something new. You decide what you think and we’ll leave it as an honorable mention.

The EZ-Flo bin feeder scale for RAS/RAP weighs lightloaded product, such as RAS, and heavier loaded product, such as RAP. In 2012, the company introduced this product for use with RAS by designing a gravity fed feeder scale that fits in the cramped area between two RAP bin feeders and the collector belt. When RAS falls from the RAS/ RAP belt feeder, it impacts the feeder scale before falling to the collector belt, allowing the scale to collect data.

As the RAS impacts the suspended plate of the scale, the force of the material flow forces the plate against a single load cell rod. The load cell measures the force and converts it into a rate signal. A rate indicator in the control house reads that signal and uses it in modifying blending rates.

For detailed information, check out the Here’s How It Works department on page 62 or contact Clarence Richard Company at clarence@clarencerichard.com. Tell them you saw it in AsphaltPro Magazine. www.theasphaltpro.com | ASPHALT PRO 55

international snapshot

International Mixes

By Cliff Mansfield

A

s a part of my engineering job for my asphalt plant consulting company, I have found myself in some of the most beautiful places in the world. Our friends to the north in Canada have some of the most picturesque landscapes in the world. I took this picture on a beautiful July day in Whitehorse, The Yukon Territories.

This state-of-the-art asphalt plant is a new ADM EX-160 portable counterflow hot mix drum plant, which I sold to Castlerock Enterprises. The plant is rated at 160 metric tonnes per hour. It features four cold feed bins, two recycle (RAP) bins, a 100-ton silo

56 January 2013

and two 30,000-gallon AC tanks. It’s also set up to run both warm mix and cold mix and is capable of operating with up to 40 percent RAP. We set up in a hard rock pit and had exceptional aggregates. Our screen splits were the same for hot, warm and cold mixes at 50 percent ½-inch, 40 percent sand and 10 percent manufactured fines. We used 5.5 percent asphalt cement (AC) by mix in all three mix types. We used PG58-22 AC for hot and warm mixes.

We used HF-500-MR AC from McAsphalt near Vancouver, B.C., for the cold mix.

www.theasphaltpro.com | ASPHALT PRO 57

58 January 2013

www.theasphaltpro.com | ASPHALT PRO 59

here's how it works

Wider drum diameters at both ends of the drum allow lower velocities for drying and increased areas for mixing.

5

4

A RAP chute introduces recycle material into the mixing section of the drum.

AC joins the dry aggregate in the second section of the drum.

1 2 The flights create a veil of aggregate.

A single loader operator feeds the bins and conveyors that send aggregate to the counterflow drum.

7 Residual gases are drawn back into the drum’s combustion zone.

8 Completed mix goes to the drag slat.

6 Heat transfer blends recycle with virgin materials in the mixing section of the drum.

3 Aggregate dries as it cascades toward the burner.

ADM’s EX Series Drum S

ometimes all a producer needs is a 100- to 425-tph operation to produce mixes with high recycled asphalt pavement (RAP) percentages. If you’re in the market for low to medium production, the engineers at Asphalt Drum Mixers, Inc. (ADM), Huntertown, Ind., have designed the EX Series asphalt plant in stationary or portable configurations for your perusal. Here’s how it works.

The single-drum counterflow plant sits in a compact footprint. The plant operator signals the system to feed aggregate into the feed end of the counterflow drum. The flights at this end of the drum are designed to create a veil of material that dries

60 January 2013

consistently as it cascades toward the burner.

The second section of the drum is where the binder, recycle and dust are introduced. The separate drying and mixing zones are designed for running high percentages of recycle while keeping emissions levels at a minimum and offering increased fuel efficiency.

Residual gases are drawn back into the drum’s combustion zone.

A RAP chute introduces recycle into the mixing section of the drum where heat transfer allows it to blend seamlessly with virgin materials.

Again, any residual gases vent back into the drum’s combustion zone.

Completed mix is conveyed to the drag slat.

For more information about the EX Series drums from ADM, contact Steve Shawd at (260) 637-5729 or sales@admasphaltplants.com.

Show us How it Works If you’re an equipment manufacturer with a complex product, let us help you explain its inner workings to the readers of AsphaltPro magazine. There’s no charge for this editorial department, but our staff reserves the right to decide what equipment fits the parameters of a HHIW features. Contact our editor at sandy@theasphaltpro.com.

here's how it works

The RAS/RAP scale can slide in or out depending on the producer’s need.

Step 4

Step 5

A rate indicator reads the rate signal.

The rate reading indicates how quickly material is moving. That helps the blending controls compensate for changes in flow.

Step 3 The load cell converts the force into a rate signal.

Step 1 RAS falls from the belt feeder and impacts the feeder scale.

RAS continues to fall onto the collector belt and move toward the drum for mixing.

Step 2 When the RAS hits the plate, a single load cell rod measures the force.

(to drum)

Richard Companies’ EZ-Flo RAS Scale W

hen you have multiple bins in series with a recycled asphalt pavement (RAP) belt scale system, how do you adjust your blending controls or bin speed to accommodate for recycled asphalt shingle (RAS) product clogs or clumps? The folks at Clarence Richard Company, Minneapolis, designed the EZ-Flo feeder scale to weigh the light-loaded product—RAS—as well as heavy loaded product—RAP—and to retrofit into existing bins while wiring into the blending computer usually with no hardware/software changes.

With the bin feeder scale for RAS/ RAP in place, the blending control can then make changes to the feeder speed based on actual weight instead of assumed volumetric weight.

62 January 2013

Here’s how the EZ-Flo bin feeder scale for RAS/RAP works.

The gravity fed feeder scale fits in the cramped area usually between two RAP bin feeders and the collector belt. As the plant operator calls for material, the RAS (or RAP) falls from the RAS/RAP belt feeder impacting the feeder scale before falling to the collector belt.

As the RAS impacts the suspended plate of the scale, the force of this material flow forces the plate against a single load cell rod. The load cell measures this force and converts it into a rate signal, known as the rate of material flow, which a rate indicator reads in the control house. The rate reading in tons per hour indicates how quickly material

is passing through the RAS flow scale and produces a signal used for blending materials.

At the control house, the RAS feeder tach signal used by most blending controls is replaced by the frequency rate signal. This information compensates for the changes in RAS density or flow (bin bridging) and can easily allow the operator to be notified when the bin runs empty. The bin is now being calibrated with a scale that reads flow rates much lower than the typical RAP belt scale.

For more information about the EZ-Flo bin feeder scale for RAS/RAP, contact Clarence Richard Company at clarence@clarencerichard.com or visit www.ez-flo.us.

resource directory ACE Group.......................... 33, 51 Contact: Carl McKenzie Tel: 888-878-0898 sales.enquiries@asphaltacesales.com www.asphaltace.com

C.M. Consulting....................... .65 Contact: Cliff Mansfield Tel: 541-354-6188 Cmconsulting@aol.com www.hotplantconsulting.com

Hercules…............................... ..57 Tel: 800-777-5617 or 727-796-1300 www.herculesus.com

Almix........................................ .11 Tel: 260-672-3004 sales@almix.com www.almix.com

Clarence Richard Co............ 40, 57 Contact: Clarence Richard Tel: 952-939-6000 Carrie@clarencerichard.com www.clarencerichard.com

Homestead Valve…….............. .23 Tel: 610-770-1100 Sales@homesteadvalve.com www.homesteadvalve.com

Asphalt Drum Mixers….39, 48-49 Contact: Steve Shawd or Jeff Dunne Tel: 260-637-5729 sales@admasphaltplants.com www.admasphaltplants.com Astec, Inc..................27, 36-37, 46 Contact: Tom Baugh Tel: 423-867-4210 tbaugh@astecinc.com www.astecinc.com B & S Light Industries...........58-59 Contact: Mike Young Tel: 918-342-1181 Sales@bslight.com www.bslight.com CEI............................................... 4 Contact: Andy Guth Tel: 800-545-4034 info@ceienterprises.com www.ceienterprises.com

Dillman Equipment................... 15 Tel: 608-326-4820 www.dillmanequipment.com E.D. Etnyre................................ 38 Contact: sales@etnyre.com Tel: 800-995-2116 www.etnyre.com EZ Street................................... 47 Tel: 800-734-1476 Info@ezstreet-miami.com www.ezstreetasphalt.com Fast-Measure............................. 40 Tel: 888-876-6050 www.Fast-measure.com Heatec, Inc...... Inside Front Cover Contact: Sharlene Burney Tel: 800-235-5200 sburney@heatec.com www.heatec.com

Humboldt Manufacturing….…..23 Contact: Robin Bailey Tel: 800-544-7220 Rbailey@humboldtmfg.com www.humboldtmfg.com Libra Systems…....................... ..19 Contact: Ken Cardy Tel: 225-256-1700 Sales@librasystems.com www.librasystems.com Maxam Equipment............... insert Contact: Lonnie Greene Tel: 800-292-6070 lgreene@maxamequipment.com www.maxamequipment.com NAPA…..................................... 64 Annual Meeting www.asphaltpavement.org

Reliable Asphalt Products......................Back Cover Contact: Charles Grote Tel: 502-647-1782 cgrote@reliableasphalt.com www.reliableasphalt.com Roadtec………………...... …….7, 9 Contact: Sales Tel: 423-265-0600 Sales@roadtec.com www.roadtec.com Rocky Mountain Conference & Expo…............... 63 Contact: Heather Clark Tel: 303-518-0618 www.rmaces.org Rotochopper, Inc..................... Inside Back Cover Tel: 320-548-3586 Info@rotochopper.com www.rotochopper.com Rushing Enterprises……......... ..57 Contact: Darrell Martin Tel: 800-654-8030 Dmartin@rushingenterprises.com www.rushingenterprises.com

Stansteel AsphaltPlant Products…........... 29 Contact: Dave Payne Tel: 800-826-0223 dpayne@stansteel.com www.stansteel.com Stansteel………………….41, 57 Contact: Dawn Kochert Tel: 800-826-0223 dkochert@hotmixparts.com www.hotmixparts.com Systems Equipment…............. ..17 Contact: Dave Enyart, Sr. Tel: 563-568-6387 Dlenyart@systemsequipment.com www.systemsequipment.com Tarmac International, Inc........... 35 Contact: Ron Heap Tel 816-220-0700 info@tarmacinc.com www.tarmacinc.com Top Quality Paving…......... ……65 Contact: John Ball Tel 603-624-8300 Tqpaving@yahoo.com www.tqpaving World of Asphalt…...............….61 www.worldofasphalt.com www.asphaltpavement.com

AsphaltPro’s Resource Directory is designed for you to have quick access to the manufacturers that can get you the information you need to run your business efficiently. Please support the advertisers that support this magazine and tell them you saw them in AsphaltPro magazine.

www.theasphaltpro.com | ASPHALT PRO 65

the last cut

WTI Drops From the Energy Information Administration

T

he daily spot price for West Texas Intermediate (WTI) crude oil may have started out the month of September at $96.47 but it fluctuated throughout the month thanks to weather and politics and civil unrest abroad. This according to the Energy Information Administration’s (EIA) Dec. 3 Petroleum Marketing Monthly report shows bouncing prices finishing at $92.18 per barrel.

What made crude oil prices move up and down and all around? EIA reported it started with a minor hurricane landing in Louisiana Aug. 29. Because the storm swept through the Gulf of Mexico, platforms off shore took precautions; “1.3 million barrels (94.8 percent) of daily crude oil production in the Gulf of Mexico region” were shut in during the storm. That meant a drop in stores that underpinned prices for a couple weeks.

The average refiner acquisition cost for domestic crude oil had climbed to $102.17 per barrel in September.

Add in politics next, mainly from demonstrations in North Africa and the Middle East. The attack on the U.S. consulate in Benghazi also affected confidence. Then the U.S. Federal Reserve Bank announced a third round of economic stimulus. By Sept. 14, the price per barrel reached its high of $98.94, according to EIA. With good stocks and not-so-good economic conditions abroad, the price went downhill from there. EIA reported that the average for the month overall was $94.51, which is 38 cents higher than August’s average per barrel and $8.95 higher than September 2011’s average per barrel.

Another interesting set of stats from EIA from the Dec. 3 report concerns the average refiner acquisition cost for domestic crude oil. It has climbed to $102.17 per barrel. The average cost of imported crude had increased to $101.82 per barrel. The composite refiner acquisition cost for crude oil rose to $101.97 per barrel.

Liquid Asphalt Cement Prices—average per ton Company, State

July ’12

Aug ’12 Sept. ’12

Oct. ’12

ConocoPhillips, Tenn.

$605.00

$585.00

$555.00

$565.00

NuStar Energy, Ga.

615.00

600.00

575.00

555.00

NuStar Energy, N.C.

615.00

600.00

575.00

565.00

NuStar Energy, Va.

610.00

590.00

570.00

565.00

Assoc’d Asphalt Inman, N.C.

625.00

595.00

570.00

560.00

Assoc’d Asphalt Inman, S.C.

625.00

595.00

570.00

570.00

Assoc’d Asphalt Inman, Va.

625.00

595.00

580.00

570.00

Marathon Petroleum, Tenn.

600.00

575.00

565.00

565.00

Marathon Petroleum, N.C.

600.00

575.00

545.00

545.00

Valero Petroleum, N.C.

605.00

585.00

560.00

560.00

Massachusetts Average

610.00

610.00

592.50

592.50

California Average

520.80

544.30

589.10

581.80

Missouri Average

570.00

545.00

516.25

516.25

Colorado Average

360.10

387.29

441.50

448.43

Data for Southeast region, Source: ncdot.org; Data for Massachusetts, Source: mass.gov; Data for California, Source: dot.ca.gov; Data for Missouri, Source: modot.mo.gov; Data for Colorado, Source: CDOT and Cenovus

Crude Oil Activity (U.S. Crude) futures spot data

stocks

Aug 31

$96.47

357.1 m bbl

Sep 7

$96.42

359.1 m bbl

Sep 14

$99.00

367.6 m bbl

Sep 21

$92.89

365.2 m bbl

Sep 28

$92.19

364.7 m bbl

Oct 5

$89.88

366.4 m bbl

Oct 12

$91.86

Oct 19 Oct 26

Sep 3

4.127

Sep 10

4.132

Sep 17

3.878

Sep 24

4.086

Oct 1

4.079

Oct 8

4.094

369.2 m bbl

Oct 15

4.150

$90.05

375.1 m bbl

Oct 22

4.116

$86.28

373.1 m bbl

Oct 29

4.030

Sources: Energy Information Administration

66 January 2013

Diesel Fuel Retail Price (dollars per gallon)

DRUM MIXERS

BAGHOUSES

AC TANKS

COLD FEEDS

SILO SYSTEMS

RAP BINS

CONTROL HOUSES

RECONDITIONED HEATERS

ROTARY MIXERS

THE INDUSTRY LEADER IN

USED EQUIPMENT 866.647.1782 • www.ReliableAsphalt.com