Hot Mix Asphalt Technology - January/February 2008 - (Page 32)

Warm Mix: The Lights are Green continued Watsonville, Calif. Accelerated performance testing has been launched on three warmmix sections and a control at Graniterock’s quarry in Aromas, near Watsonville. Working for Caltrans, the University of California–Davis has set up its Heavy Vehicle Simulator (HVS) over the four 150ft.-long sections that used additives Advera WMA, Sasobit and Evotherm DAT, says Mike Cook, Graniterock’s director of quality services. The pavement section is enclosed where the HVS runs, and the temperature inside is elevated to 100o F. The HVS is a framework approximately 80 feet long with a weighted tire that runs in one direction over the pavement, then is lifted, returns, and runs on the pavement again. “Our real emphasis is on trying to see how the in-place mixes perform under stress.” Cook says each warm-mix additive has a specific temperature range that best suits the mix for placement. The small quantities used for the California demo didn’t permit the contractor the experience to learn exactly the best temperature and dosage for each warm-mix additive, Cook said. “If you could make some mixes over time, you could optimize the best temperature and dosage combination,” he said. Cook said warm mix has two advantages. For one, compaction is easier to achieve. He said compaction could have been achieved at even lower temperatures than Graniterock used, which was 240 to 250o F. Second, you can increase production at the plant. “You can put out more mix per hour at lower temperatures,” says Cook. Just about all traffic signals are green for warm mix, with a few caution lights tossed in. “As long as everybody adheres to best practices, controls moisture content, controls volumetric properties and other mix design parameters, then warm-mix technologies look good,” says Corrigan of FHWA. “It’s too early to tell if the long-term performance is there. But we haven’t seen anything to date that would indicate any issues we have with warm mix.” HMAT Daniel Brown is a freelance writer living in Des Plaines, Illinois. NAPA has released a new publication about warm-mix asphalt. The publication is Best Practices in Warm-mix Asphalt Production and Construction (QIP-125). The Warm-Mix Asphalt Technical Working Group has a new Web site at www.warmmixasphalt.com. The site, which is underwritten by NAPA and the State Asphalt Pavement associations, has a wealth of information about warm mix, including publications, PowerPoint presentations, and links to the technology providers’ Web sites. Replacing Your Track Pads Too Often? Wearing Out Too Fast? Try BLS Poly Bolt-On® TUFPADS® BLUES™ Track Pads • Receive 15-30% more wear than the original black polyurethane See BLS At CONEXPO-CON/AGG 2008 March 11-15, 2008 Las Vegas, USA Booth C-4739 in Central Hall 2 Too Much Time Removing & Installing? Try BLS Poly Bolt-On® TUFPADS® Track Pads • Easy to install & remove, save up to 50% in labor time • Save up to 43% on future orders by reusing the steel grousers Now available for Cat 5510 and Blaw-Knox Asphalt Pavers 4410 & 5510 *Also a large selection for many Compact Excavators …What Our Customers Say!! BLS Poly Bolt-On® TUFPADS® Track Pads Ingersoll Rand uses BLS Poly Bolt-On® Track Pads as their polyurethane option on MT-2000 half-lane milling machines. TUFPADS BLUES Track Pads "NOW WITH THESE PADS, WE CAN CHANGE A WHOLE MACHINE IN A COUPLE OF HOURS. THEY JUST SAVE SO MUCH TIME. IF WE HAVE TO, WE COULD CHANGE THESE PADS OUT IN THE FIELD BECAUSE IT DOESN’T TAKE THAT LONG. YOU DON’T HAVE TO BUY THE STEEL GROUSER. YOU DON’T HAVE TO UNBOLT THE STEEL GROUSER FROM THE TRACK CHAIN. YOU JUST TAKE THE POLY OFF AND PUT ANOTHER BACK ON." -- Mr. Bob Welfle Welfle, Inc., Ohio ® ™ "THERE’S NO QUESTION OF THEIR VALUE, ALL THINGS BEING EQUAL. THEY CERTAINLY LAST LONGER. AND SINCE THE INTERVAL TO CHANGE IS GREATER, YOUR LABOR TO CHANGE PER SET IS LOWER AS WELL. THAT CAN MEAN A PRETTY GOOD SAVINGS THERE." -- Mr. Ryan Essex, VP and GM, U.S. Operations Roadtec Inc. uses BLS Poly Bolt-On® Track Pads as standard equipment on RX-500, RX-700 & RX-900 milling machines Miller Group, Georgia ** Now Available Installed Direct from Ingersoll Rand & Roadtec ** 800-307-0299 Fax: 630-775-0903 32 334354_BLS.indd 1 • Hot Mix Asphalt Technology – JANUARY/FEBRUARY 2008 6/21/07 1:23:44 PM http://www.warmmixasphalt.com http://www.tufpads.com

Table of Contents Feed for the Digital Edition of Hot Mix Asphalt Technology - January/February 2008

Hot Mix Asphalt Technology - January/February 2008 Contents Chairman's Commentary President's Perspective A Conversation with the New NCAT Director NCAT Test Track: Real-Time Testing for Real-World Results Warm Mix: The Lights are Green Illinois Tollway Tests RAP in Fast Forwarded Research Big Creek Teams with TxDOT to Pave Using Innovative Asphalt Mix Diamond Achievement Commendation Issues a Call for Quality Calendar of Events CONEXPO-CON/AGG Product Review Index of Advertisers Advertisers.com

Hot Mix Asphalt Technology - January/February 2008

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