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Use of scrap tire rubber : state of the technology and best practices.
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  • Abstract:
    The California Department of Transportation (Caltrans) has been using scrap tire rubber (called crumb rubber modifier (CRM)) in asphalt pavements since the 1970s in chip seals and the 1980s in rubberized asphalt concrete (RAC). The performance of the projects has varied from poor to excellent, with relatively good overall performance. In recent years, however, improved specifications and practices have yielded more consistent performance. To evaluate the state of the technology of using scrap tire rubber in paving materials, a comprehensive review of the literature search was undertaken. Nearly 400 documents representing a cross-section of information and focused primarily on experience throughout the United States were reviewed. Findings were organized in the following topics areas, with some overlap: historical perspective; applications/field operations; materials selection and design; structural design; performance; recycling; cost; environmental issues; other uses; and specifications.
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