Waste tire and shingle scrap/bituminous paving test sections on the Munger Recreational Trail Gateway segment. interim report
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1991-02-01
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Abstract:The need to reduce Minnesota's dependence on land fills resulted in a unique cooperative venture by three state agencies. A partnership was forged between the Minnesota Pollution Control Agency (MPCA), the Minnesota Department of Natural Resources (DNR) and the Minnesota Department of Transportation (Mn/DOT) to investigate the use of recycled tire rubber and processed asphalt shingle scrap. The result is a two mile section of the Willard Munger Recreational Trail in St. Paul, constructed with asphalt paving mixtures which contain varying percentages of recycled tire rubber and shingle scrap. Special bituminous mix designs were formulated using 3% rubber, 6% rubber, 3% rubber with 6% shingles, and 9% shingles. The mixtures containing rubber did not exhibit acceptable mix characteristic values under present Mn/DOT bituminous specifications. The shingle-only mix met specifications and yielded an economic advantage of decreasing the asphalt cement demand of the mix. Conventional mixing and paving equipment was utilized for construction. This application appears to be a viable alternative to landfilling these materials. However, costs for the mixtures containing rubber increased from 35% to 50% over the cost of the conventional mixture. Since the use of shingle scrap was negotiated by the private companies involved, no comparable cost data is available. 2 Figures, 2 tables, 1 photo, 1 appendix. 3,918k, 33p.
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