Research on interfacial shear properties of graphene-modified asphalt based on molecular dynamics simulation

In this paper, the separation behaviors of the graphene-modified asphalt interface are investigated using the molecular dynamics simulation method. The separation behaviors of the interface are studied in the normal and tangential directions, respectively. The four-component asphalt model is selected for the study and simulated by the OPLS-AA force field. The separation of graphene-asphalt interface under three constraints is discussed, and their stress-displacement curves are comparative analysis to determine the boundary conditions suitable for the study of interface properties. After that, the mechanical behaviors of the interface in the normal and tangential directions are investigated using tensile simulation and shear simulation, respectively. The effects of loading velocity, temperature, and interfacial interval thickness on the interfacial shear strength are also investigated. It shows that, interfacial shear strength increases with the loading velocity increases while decreases with temperature increases. Finally, compression-shear and tension-shear simulations are performed, and find that compression enhances the interfacial shear strength, while tension weakens shear strength.