The implementation of Superpave mix design strategies in the 1990s, industry professionals have successfully improved rutting resistance of hot mix asphalt (HMA) by specifying higher grades of asphalt binder and quality of aggregates. Currently, the primary mode of distress in HMA pavements is cracking, which can be caused by poor mix designs, increased use of recycled materials, problems with construction quality and failing to adequately address underlying pavement distresses during pavement rehabilitation. Many state transportation agencies are now specifying increased asphalt contents in their mix-design and acceptance programs to improve cracking resistance of HMA. In volumetric mix design, the difference between air voids and voids in the mineral aggregate (VMA) controls the effective asphalt content. To increase the effective asphalt content in mixes, it is necessary to either target a lower air void content or increase the minimum VMA criteria. The objective of this study was to assess the impacts and determine the viability of increasing asphalt binder contents using the regressed air voids concept.
This project evaluated the impact of the air voids regression approach on cracking, rutting, and moisture damage resistance of asphalt mixtures. The e...
This project sought to evaluate performance-based methodologies for asphalt mix design and develop a preliminary balanced mix design (BMD) specificati...
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United States Department of Transportation
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