Hot Mix Asphalt Technology - January/February 2008 - (Page 27)

Warm Mix: The Lights are Green continued and Ryan Road in Milwaukee, where Sasobit and Evotherm were used. Demonstration projects Warm-mix trial pavement sections recently have been constructed in New Jersey; San Antonio, Texas; Yellowstone National Park; Watsonville, Calif.; Nashville, Tenn.; and Vancouver, British Columbia. Wharton, N.J.—Contractor Tilcon New York paved a quarry road with 350 tons of warm mix produced at its Mt. Hope facility in New Jersey. Tilcon, which is owned by Oldcastle Materials, held a twoday best practices seminar, and paved using the warm-mix additive Sasobit in a 30 percent RAP mix on the second day. Attendees included Oldcastle employees, county and municipal engineers, as well as officials from the New Jersey Turnpike and the Port Authority of New York and New Jersey. Both Larry Michael and NCAT’s Randy West made presentations. “We produced the first 100 tons at 265 to 270o F, then dropped the temperature to 240 to 250 based on the nuclear density readings,” said Scott Laudone, Tilcon’s general manager of asphalt operations and quality control. “We found we got better compaction as the temperature dropped.” Both Laudone and quality control manager Rebecca Guardino agreed that the Sasobit improved workability – even with 30 percent RAP. Tilcon added an antistrip additive to the mix because stripping has been a problem with some RAP mixes in that region, Laudone said. “The obvious advantage is environmental – you get zero smoke at the paver,” says Laudone. “I see warm mix as a win-win for paving inside of tunnels, because the smoke is gone. One of the reasons we went with Sasobit was that it can be added at the refinery.” San Antonio, Texas; the APWA convention. The American Public Works Association’s street construction demo of warm mix drew some 250 people last September. “We’ve done about 5,000 tons of warm mix through various demos, so our plant people are very comfortable with the process,” said Harry Bush of Vulcan Materials, which supplied the mix. “The temperature of the mat under the paver was about 100 degrees less than normal hot mix. And compaction went very smoothly.” Yellowstone National Park, Wyoming. “Our clients are the National Park Service and the National Forest Service. Should this warm-mix technology prove itself, the nature of our work would be enhanced, because the areas we work in are environmentally sensitive,” says Brad Neitzke, a materials engineer for the Federal Lands Highway, a division of FHWA. “Certainly, warm mix improved 337826_DSI.indd 1 Hot Mix Asphalt Technology – JANUARY/FEBRUARY 2008 • 27 7/12/07 8:15:04 PM http://www.drivesourceusa.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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