Asphalt Mixture Proportion Design Method of Coarse Graded High-Modulus Asphalt Concrete with Skeleton-Embedded Structure

Abstract

In view of heavy traffic situation of asphalt pavement and the project needs in China, a kind of mixdesign method of coarse graded high modulus asphalt concrete(HMAC25)with skeleton embedded structurewas proposed. A kind of low labeled hard asphalt with penetration degree of 30(0.1 mm)(AH-30)wasused as the cementing material of high modulus asphalt concrete, and the nominal maximum aggregate size isno smaller than 26.5 mm. The asphalt-aggregate ratio of the asphalt mixture was determined by using thedesign method of asphalt mixture based on aggregate closest compact condition. The result of laboratory testindicates that(1)compared with the required value in the related specification, the high temperaturestability of high modulus asphalt concrete made with the proposed method improved by more than 7 times; (2)compared with the maximum value recommended in the related specification, the compression resilientmodulus at 20℃ increased by nearly 30%;(3)the low temperature anti-cracking performance and moisturestability can also meet the requirements of the specification.