Abstract

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Title:: Change law of volume parameters and predictive method of VMA of porous asphalt mixture

Author(s):: GUAN Bo; CHEN Zhi-jun; HAO Pei-wen; School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China

Keywords:: road engineering; void in mineral aggregate (VMA); predictive method; porous asphalt mixture; volume parameter; effective asphalt content

Abstract:: In order to reasonably estimate the VMA of non-compacted mixture specimen, a new method of determining asphalt content of drainage asphalt mixture was built based on volume parameters. The relationships among volume parameters and change law of volume parameters for porous asphalt mixture by means of theoretical analysis and indoor tests were studied in this paper, which revealed the quantitative relationship among VMA, VV and effective asphalt content of drainage asphalt mixture. Based on the calculation model of VMA, considering the effect of aggregate gradation, aggregate accumulation characteristics and aggregate angular features on VMA, this paper proposed an empirical calculation method for VMA upon aggregate gradation. The results show that the aggregate gradation has a significant influence on VMA, and the value of VMA mainly depends on aggregate gradation. While the asphalt aggregate radio is within 4.0% to 5.0%, the change has no significant effect on VMA. Comparing the results of VMA from calculated and measured, which show that they are similar and have a good linear correlation. According to the relationship among VMA, VV and effective asphalt content, the effective asphalt content can be determined by applying the new method in the design process of porous asphalt mixture.