Two-Step Improvements of Volumetric Design Method based on Multi-Point Supported Skeleton for Asphalt Mixtures

The volumetric design method based on multi-point supported skeleton for asphalt mixtures (V-S method) was proposed to design skeleton-dense asphalt mixtures. However, with this method, asphalt mixtures possess unstable performance in engineering practice. In this study, the V-S method was improved by two steps: first, the coarse aggregate condition for measuring the stacking density was improved; second, the coarse aggregate degradation was considered. The two improvements were verified through the deviations between the design and actual values of three volume parameters, including air voids in coarse aggregates, mineral aggregates, and asphalt mixtures. Results show that the stacking density measured in the dry rodded condition is effective. Moreover, the degradation rate δ of coarse aggregates is proposed, and it is determined by Marshall specimens of coarse aggregates with 100 blows on single side. By considering the degradation rate δ, the new design equations are developed and then the procedures of the second improved V-S method are determined. The volume parameter deviations of the asphalt mixtures designed by the second improved V-S method are very small. In conclusion, these asphalt mixtures possess satisfactory performance, including high-temperature stability, low-temperature performance, and moisture susceptibility.

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  • English

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  • Accession Number: 01713145
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 26 2019 3:37PM