TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 492: Performance Specifications for Asphalt Mixtures documents the performance tests used in conjunction with volumetric properties for mixtures. Performance tests are intended to extend service life by guiding material selection and proportions. The synthesis provides examples of engineering tools used in the development and implementation of performance specifications for asphalt mixtures, examples of the contents of performance-based specifications (PBS) currently used or in development, information on test program implementation and research efforts related to PBS for asphalt mixtures, and the reported benefits and challenges with implementing PBS.
Table of Contents
|Chapter One - Introduction||3-10|
|Chapter Two - Literature Review on Performance Specifications for Asphalt Mixtures||11-28|
|Chapter Three - Survey on Use of Performance Specifications for Asphalt Mixtures||29-38|
|Chapter Four - Case Examples of Performance Specifications for Asphalt Mixtures||39-53|
|Chapter Five - Conclusions||54-56|
|Appendix A - Survey Questions and Results||65-86|
|Appendix B - List of Agency Respondents||87-87|
|Appendix C - Links to Resources Identified in Survey and Interviews||88-90|
|Appendix D - Sample Documents Related to Performance Testing as Part of Specifications for Asphalt Mixtures (electronic format only, available online)||91-297|
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