Influence Research of Gradation Segregation on Performance of Asphalt Mixture

Based on laboratory tests,an anlysis is made of the influence of state and degree of gradation segregation on volume parameter,service performance and mechanic performance of asphalt mixture.The study shows that the coarse aggregate segregation has a greater influence than fine aggregate segregation on the performance of asphalt mixture under the different levels of segregation.Coarse-aggregate-rich regions is of high air voids and low asphalt contents which easily lead to moisture damage as well as to durability-related distress such as fatigue life and indirect tensile strength;On the other hand,mat areas rich in fine aggregate are associated with low voids and high asphalts.Although these areas have no obvious adverse effect on moisture susceptibility and fatigue life of asphalt mixes,they are susceptible to rutting and flushing.