Performance Specifications for Asphalt Mixtures (2016) / Chapter Skim
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3 on performance-based properties. As the SHRP research progressed it became apparent that testing and analysis for the performance predictions would be too complex for many routine projects.
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4 by weather-related factors such as low temperature and cooling cycles) ; mixture aging (due to high temperature environment factors such as extreme temperatures and duration of hot weather, and the in-place density)
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5 most recently in 2005, have demonstrated the increasing use of QA specifications over the last 20 years. The study by Elmore et al.
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6 volumetric mixture design systems, however, provide only limited insight into such behavior, which has driven researchers and practitioners to explore the development of more performance-based mixture designs and related test methods that could be used to optimize the often competing performance needs of a pavement (e.g., adequate resistance to both rutting and cracking) to meet the unique characteristics of a given project or application.
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7 service lives. There is a need to evaluate these efforts and obtain examples of practices that are reported to be effective in order to facilitate the exchange of information and to help other states.
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8 specific agencies that were interviewed, and indicates the agencies that were ultimately selected to serve as the case examples, which will be presented in chapter four. Interviews with transportation Practitioners in case example agencies Based on the results of the survey responses, 11 states and one local agency were selected for additional data gathering on practices used related to the use of performance specifications for asphalt paving mixtures.
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9 provisions and pay factors for asphalt performance specifications. The chapter closes with a presentation of the benefits and challenges to performance testing of asphalt mixtures, as reported by the transportation agencies.
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10 years or more. It is synonymous with longevity and for asphalt pavement can mean a mixture's resistance to raveling, rutting, fatigue and thermal cracking, or moisture damage.
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