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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