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30 posts categorized "Regional and State Issues/Policy"

06/02/2014

Extending the Season in Manitoba

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Manitoba Infrastructure and Transportation reported on their success  extending their road construction season since 2009 with Evotherm WMA to the Reed Journal of Commerce. With over 30 different WMA products on the market, they use Evotherm most often on their roads., particularly in Alberta, Ontario, and the Maritimes.

“We have tried three different products since 2010,” surfacing materials engineer Tara Liske said, “We have found that Evotherm is the one we have been using most often.” Liske mentioned how easy Evotherm is to use since it is readily available and can be added to the asphalt cement prior to mixing in the aggregate. Liske highlighted several benefits of using Eovtherm WMA technology including lower mix temperatures, the environmental impact, better jobsite conditions, longer hauls from constructions sites and extending the length of the paving season.

 “The warm mix retains heat and workability longer,” she said, “And we have found Evotherm enhances the durability of our mixes.” Most importantly, warm asphalt can be applied at temperatures as low as zero degrees Celsius, extending the paving season well into fall. “We had crews working into November in past years,” said Liske. 

05/14/2014

Mill and Pave!

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New York City's DOT has one of the more challenging missions in the country in keeping the pavement smooth for the city that never sleeps. They produced a video, Mill and Pave!, to give an inside look at their street resurfacing process. Narrated by Deputy Commissioner for Roadway Repair and Maintenance, Galileo Orlando, it showcases the technologies (Warm Mix Asphalt at 1:30) that keep the city's operations cost and energy efficient. Maintaining the City's 6,000 miles of streets is no easy task, but the successful upgrade of the Hamilton Asphalt Plant and the dedication of their crews help keep the city moving.

 

05/02/2014

New Mexico Specifying 90% WMA Projects

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New Mexico DOT issued the 2014 edition of The Standard Specifications for Highway and Bridge Construction. In it they define warm mix temperature as asphalt mix produced at 275F or less. When utilizing warm mix asphalt, ambient paving temperatures can be dropped 20F for open graded friction courses (OGFC) and 15F for dense graded mixes. New Mexico DOT specifies warm mix asphalt in approximately 90% of the projects let so far this year.

NMDOT also commissioned The University of New Mexico to study the warm mix projects that have been completed to date. Researchers conducted a visual scan of completed warm mix projects. Asphalt Ambassador Mike O’Leary joined the team for a trip that evaluated five projects. Preliminary results were that chemical warm mix projects looked good while foam did not have as good of a visual showing.
 
Author: Mike O'Leary

04/02/2014

Colorado Flood Response Continues

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Due to warm mix asphalt's success on flood response projects last fall, the Colorado Asphalt Pavement Association has indicated that the remaining 850 million in flood repair work will be completed using warm mix. Last year, contractors from Colorado and surrounding states utilized Evotherm warm mix asphalt to reconnect communities cut off by damage from 500-year floods. 

Tom Peterson, CAPA executive director, worked with contractors and agencies to implement warm mix technology. "We told them WMA would be perfect, as the contractors needed to get in, place the material and compact it very quickly," Clayton said. "Going up in thos canyons wtih very little sunlight, and three-hour hauls, there is no way they could heat the asphalt high enough to retain workability without burning the light ends of the binder off, making the material virtually useless."

Kiewit Infrastructure and Coulson Excavating utilized Evotherm WMA on US. 34 where the flood had completely wiped out the roadbed in some places. Ken Coulson, president, Coulson Excavating, said, "The 4-in deep pavement was placed in one lift. It turned out so good that they may never mill it out."

 

The current issue of Roads & Bridges contains a full article by Tom Kuennen on the asphalt industry's flood response efforts.

Author: Heather Dolan

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