Practices for Unbound Aggregate Pavement Layers (2013) / Chapter Skim
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Pages 119-124
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119 chapter six sUMMARY OF CURRENT PRACTICE AND EFFECTIvE PRACTICEs OBJECTIvEs OF sYNTHEsIs sTUDY The primary objective of NCHRP Synthesis 20-05 Topic 43-03, Practices for Unbound Aggregate Pavement Layers, was to gather information on the current state of the practice and the state-of-the-art research findings on the following topics: 1. Materials characterization and quality of natural aggregate and common recycled materials that relate to performance; 2.
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120 of unbound aggregate layers) were documented with proper construction techniques.
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121 • Sixty-three percent of the responding agencies limit the maximum construction lift thickness to be less than 8 in.
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122 • Forty-eight percent of the agencies have not incorporated the use of recycled aggregates from existing base and subbase courses into their specifications. • Eighty-three percent of the responding agencies indicated that contractors are not allowed to use locally available "marginal" or "out-of-specification" aggregates for UAB and subbase layer construction.
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123 advocated the promise shown by this method. Although pilot studies using IC techniques have been conducted in the United States since 2004, state transportation agencies are hesitant to use this technology more actively, which is primarily the result of the lack of having available standards and construction specifications.
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124 been available for more than a decade. These methods can adequately capture the stress-dependent nature of unbound aggregates and are ready to be implemented in practice.
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