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Recycling tear-off shingles

Paving Innovations

The time has come for tear-off asphalt shingles to be accepted as another standard recycled material into hot mix asphalt, says Robert Kuehborn, Commercial Asphalt Co.

Once residential asphalt shingles have been sorted and cleaned to remove contaminants and then ground, the product can be introduced into the mix at hot mix asphalt (HMA) plants.

Plehal Blacktopping installed the asphalt pavement at Dem-Cons Shakopee plant. Our paving crew didnt notice any difference, says Jack Van Remortel, president.

Given the oil content within tear-off shingles (at least 20 percent), about 32,000 tons of binder would be conserved each year.

During a special event at Commercial Asphalt, Shakopee, MN, asphalt contractors learn the benefits of using recycled asphalt shingles (RAS) in HMA designs.

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Plehal Blacktopping installed the asphalt pavement at Dem-Cons Shakopee plant.

Our paving crew didnt notice any difference, says Jack Van Remortel, president of Plehal Blacktopping. The bituminous mixture was installed using normal equipment and procedures.

MnDOT has been a leader in the country among other state departments of transportation when it adopted an earlier specification in 1996 for the use of manufacturers shingle scrap for use in HMA.

This new shingle scrap comes from the three shingle manufacturers located in Minnesota. Since then, MnDOT has participated in five demonstrations of road construction projects that have successfully incorporated tear-off or used shingles into HMA pavements.

MnDOT is currently considering how best to write requirements for an updated new materials specification that would allow tear-off shingles in HMA.

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