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31 posts categorized "Regional and State Issues/Policy"

08/21/2014

New Solution for Rural Roads

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MWV Asphalt Innovations and Charleston County are collaboating to improve the method and materials used to pave low-volume dirt roads in South Carolina and the Southeast. These efforts resulted in a reduction of construction costs from an estimated $1.1 million to approximately $350,000 for the Joseph White Road project.  

Rural roads present many challenges to counties across the country. These low-volume roads are commonly one to two lanes wide with natural, gravel or other surfacing and may have been constructed to relatively low standards with a limited budget while forming the transportation backbone of many communities.  Matthew Fountain is the Engineering Manager with Charleston County Public Works. “We need to pave these roads because the regular maintenance is overwhelming...Not to mention the expense.  We need something that is economical, constructible, and sustainable.” 

Sanders Brothers Construction started with the SCDOT standard open graded friction course (OGFC) mix designed for interstate traffice. They first adjusted the aggregate gradation to accomodate locally sourced material. The lower traffic load requirements allowed for the use of a PG64-22 binder supplied by Associated Asphalt instead of polymer modified asphalt.  The addition of Evotherm warm mix asphalt technology allowed the removal of expensive fibers and lime while maintaining drawdown standards and adhesion properties. The resulting Charleston County mix was engineered to perform as a 2” lift as the final surface course.

Stormwater management is critical in the southeast where flooding rainstorms are a part of summertime. Transitioning a dirt road to a pervious pavement improves the road surface for residents while eliminating the need for drainage ditches and their associated easement issues (no digging up someone's front yard). In a few short hours, the residents of Adams Run residents and commuters of Joseph White Road saw it transformed from a dusty road to a freshly paved street that was ready to use. 

 

An added bonus is how well the road handles the summer rain - much better than the old dirt road!

 

Author: Dean Frailey

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

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