United States Department of Transportation
i
Investigations Into Organic Scrap Material Substitutions in Portland Cement Concrete
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1995-12-01
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[PDF-444.00 KB]
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Edition:Final Report
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Abstract:As part of its ongoing recycling efforts, the Texas Department of Transportation (TxDOT) is attempting to reduce solid waste generation by 40 percent, and to spend at least 10 percent of its budget for consumable supplies, material, and equipment. Accordingly, the agency is evaluating every opportunity to use or reuse waste materials. Because of the high volumes of concrete produced every year for TxDOT construction projects, the agency has begun evaluating the feasibility of incorporating recycled materials in roadway construction. Previous research has successfully used fly ash, silica fume, and other inorganic waste materials in concrete. This research project evaluated less likely candidates for concrete constituents by evaluating workability, compression strengths, and flexural strengths of portland cement concretes containing scrap plastic, crumb rubber, and recycled asphalt concrete pavement. This research effort suggests that concrete for roadway construction can contain significant volumes of organic scrap materials, such as waste plastic, crumb rubber, and recycled asphalt concrete pavement. The applications recommended for proposed special provisions are minimal in their structural requirements. This allows the levels of scrap introduced into the concrete to balance the performance parameters of the existing specifications with as much of the intended scrap as is economically practical.
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