▎ 摘　　要

The purpose is to enhance the service life of heavy cross asphalt pavement and maintain good road performance throughout the service cycle. Graphene nanoplatelets/rubber crowd composite modified asphalt were prepared. The influence of different temperature and frequency on the high temperature performance of composite modified asphalt was evaluated. The viscoelastic energy of composite modified asphalt under different stress and different temperature was assessed. The rheological properties of GNPs/rubber powder composite modified asphalt at low temperature were studied. The microstructure and it spectra of composite modified asphalt were compared and analyzed. The results show that the high and low temperature properties and viscoelasticity of rubber powder modified asphalt can be improved by adding GNPs. GNPs/rubber powder composite modified asphalt can effectively improve the performance of asphalt pavement in high temperature and heavy load traffic. The combination of GNPs and rubber powder improves the crack resistance of asphalt at low temperature. By analyzing the microscopic mechanism, it can be seen that GNPs has optimized the segregation phenomenon of rubber powder modified asphalt and improved the adhesion between asphalt and ore in the composite modified asphalt mixture. (C) 2020 Elsevier Ltd. All rights reserved.