Recycled shingle-asphalt mixture used to pave Missouri roads

Friday, April 23, 2010 | 10:49 a.m. CDT

JEFFERSON CITY — Missouri's Department of Transportation says it has saved more than $20 million by using recycled asphalt and housing shingles to pave roads.

Agency officials say the mixture has proven to be very durable, cheaper and more rut-resistant than traditional asphalt.

In 2009 the department recycled a half-million tons of asphalt and 53,000 tons of asphalt roofing shingles — enough shingles to cover nearly 17,000 homes.

MoDOT says recycling these materials reduced the amount of petroleum used in road construction by 20 percent in 2009 and kept the shingles out of landfills.


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Ellis Smith April 23, 2010 | 12:38 p.m.

According to document R-2005A TS-2c, this practice has been used in the United States for about 15 years (as of 2005), but relatively speaking it is considered "new." There is also "Glassphalt" (see Wikipedia article and Wikipedia's references), developed at Missouri University of Science & Technology. Glassphalt blends 10-20% recycled glass with asphalt to create a reflective highway surface or airport runway surface.

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Ellis Smith April 24, 2010 | 6:39 a.m.

In theory it should be possible to use both recycled shingles AND recycled glass in an asphalt paving product. This would result in something that allows both shingle and glass recycling while providing a safer highway or airport runway surface (at night). One of the people involved in the Glassphalt project is a non-commercial pilot.

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