Volumetric Requirements for Superpave Mix Design (2006) / Chapter Skim
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In recent years, some agencies have modified the design air void content for Superpave mixtures in order to improve their performance. The Arizona DOT, for example, currently specifies a design air void content of 5% for Superpave mixtures.
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Research Objective The research objective for NCHRP Project 9-25 is stated in the RPS: The objective of this research is to develop recommended mix design criteria for VMA,VFA, or calculated binder film thickness, as appropriate, to ensure adequate HMA durability and resistance to permanent deformation and fatigue cracking for coarse and fine, dense-graded mixes in the context of the Superpave mix design method. The research objective for NCHRP Project 9-31 is also stated in its RPS: The objective of this research is to recommend for future field validation the range of design air void content, within the context of the Superpave mix design method, required for adequate durability and resistance to permanent deformation and fatigue cracking of dense-graded HMA.
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The fatigue model proposed in this research, for example, is based largely on continuum damage theory, reduced through mathematics and calibration with laboratory data to a simple formula comparable with traditional empirical equations for flexural fatigue life. To refine the models developed from analysis of laboratory data and to verify their validity in application to field data, in most cases they were applied to other data sets generated in independent research.
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