Molecular Dynamics Study of the Diffusion between Virgin and Aged Asphalt Binder

The diffusion between the virgin and aged asphalt binder in recycled mixture is a crucial factor affecting its macro-mechanical performance. In this study, combined model of virgin-aged layered structure was assembled based on molecular dynamics (MD) method. A four-component twelve-category molecule were used to asphalt. behaviors characterized by mean square displacement (MSD), coefficient, relative concentration cohesive energy density (CED). Results indicated that at same temperature, coefficient largest, followed As temperature increased, both sides overlapped certain extent. covered lengths larger than those asphalt, indicating mainly manifested as from development CED fraction free volume (FFV) mutual attractive interactions among molecules layers became strong cohesion properties inside better.