United States Department of Transportation
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A Study of the Use of Recycled Paving Material - Report to Congress
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1993-06-01
[PDF-2.55 MB]
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Abstract:Section 1038(b) of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) (Pub. L. 102-240) required the Department of Transportation and the Environmental Protection Agency to conduct a study of asphalt pavements containing scrap tire rubber and synthesize the experience with other recycled materials. Highway agencies have been evaluating crumb rubber modifier (CRM) technology applications at different levels of development since the 1970s. Ten CRM technologies were identified. The performance of asphalt pavements using CRM technology has been mixed. The amount of documented research on recycling CRM paving materials is limited. An analysis, using the results of seven studies, was conducted to compare the relative threats/risks to human health and the environment of conventional asphalt paving to CRM asphalt paving. The health/environmental comparison was influenced by numerous variables. The data contained no obvious trends to indicate a significant increase or decrease in emissions attributed to the use of CRM. The highway construction industry has a long history of using recycled products for highway construction. This report summarizes some of the industry's experiences and, where sufficient information exists, it provides documentation regarding the economic savings, technical performance, threats to human health and the environment, and environmental benefits of using recycled materials in highway devices and appurtenances and highway projects. A supporting document to this study is a research synthesis report, FHWA-RD-93-088, titled "Engineering Aspects of Recycled Materials for Highway Construction".
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