Analysis on the road performance of graphene composite rubber asphalt and its mixture
Rui Guo, Jianhua Tang, Jianfeng Gu, Guangling Guo, Xuming Feng
Abstract
In this paper, it analyzed the road performance of graphene composite rubber asphalt binder and its mixture by comparing with that of AH-70# and SBS modified asphalt, based on rheological test and routine test, in combination with a highway example in the Dunhuang area, in China. The results that it compared with AH-70# and SBS asphalt, the graphene composite rubber modified asphalt’s penetration decreased by 28% and 20.6%, the ductility decreased by 32.5% and 22.9%, and softening point increased by 47.9% and 12.3%, the rutting factor increased by 186.75% and 9.95%, the stiffness modulus decreased by 27.62% and 7.74%, and the creep rate increased by 9.68% and 3.01%. The optimum asphalt content of the SMA mixture with graphene composite rubber modified asphalt was 0.2～0.5% higher than that of AH-70# and SBS asphalt mixtures. Under the same test conditions, the graphene composite rubber modified asphalt mixture’s Marshall stability increased by 49.4% and 14.8% compared with AH-70# matrix and SBS asphalt mixtures. The graphene composite rubber modified asphalt mixture had better flexural strength and dynamic stability than AH-70# and SBS asphalt mixtures, and the asphalt mixture’s the failure strain and dynamic stability were increased by 9.87%, 4.9% and 78.1%, 30.5% respectively, which can provide a reference for in-depth understanding of the performance of graphene composite rubber modified asphalt mixture and its application in engineering.