Effect of Density Variation of Coarse Aggregate on Asphalt Mixture Properties

摘要

There are very few research achievements about the effect of aggregate densityrnvariation on the properties of asphalt mixture. In this paper, it was studied by testingrnin the laboratory at the same gradation and the same asphalt aggregate ratio. Thernresults showed that, as aggregate gradation, water absorption, asphalt aggregate ratiornremain unchanged, the coarse aggregate density increases, percentage of voidsrndecrease accordingly. When the density increases by 0.2 g/cm~3, percentage of voidsrnreduces by 1%, and the voids in mineral aggregate of the mixture changes little, andrnthe mixture’s capacity to prevent deformation at the high temperature decreasesrnaccordingly, but the density variation changes very little about the water stability andrnanti-cracking at low temperature. Considering the percentage of voids changingrnrange of the asphalt mixture, it is suggested that during the production process, therndensity of the same batch of the coarse aggregate can only float within the range of ±rn0.1kg/cm~3.The result of this research can be taken as a useful reference as modifyingrnand revising the related technical specifications of the asphalt pavement.