Environmentally friendly elimination of moss from open-graded asphalt pavement.
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2011-04-01
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Abstract:Caltrans has discovered moss growing on U.S. Highway 101 in Del Norte and Humboldt counties, U.S.
Highway 199 near the Smith River and other roadways in Caltrans District 1. These areas are heavily
forested, and the heavy tree canopies shielding roadways reduce sunlight and contribute to moisture
retention on the pavement. In the interest of providing a drier—and safer—pavement, Caltrans has used
an open-graded asphalt pavement mix with a maximum aggregate size of 1 inch on some roadways in
District 1. Open-graded mixes consist mostly of aggregate particles with few fines. They provide a more
porous surface that quickly drains surface water to reduce hydroplaning.
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