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Bike Trail Being Paved With Asphalt Made From Plants Instead of Oil

by LiveModern Webmaster last modified Jan 04, 2012 02:15 AM
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by last modified Oct 07, 2010

Bioasphalt developer Chris Williams and paving machine.Credit: Photo by Mike Krapfl/Iowa State University Asphalt is usually made from the bottom of the barrel , the dregs of the oil refining process. But then along came the tar sands and better technologies for refining heavy oil into gasoline, and the price has climbed. John has noted that it has got so expensive that rural roads are going back to the stone age . But Chris Williams of Iowa University has come up with an interesting alternative; he has cooked up a bio-oil from plants and trees that can replace the asphalt glue that holds our pavement together- Bioasphalt. ... Read the full story on TreeHugger






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