Abstract
Conventional asphalt binder derived from the petroleum refining process is widely used in pavement engineering. However, asphalt binder is a non-renewable material, while waste cooking oil (WCO) is a renewable original material, so it can be used as an additive for asphalt binder. Several studies found that the WCO changes mechanical properties of asphalt binder. However, the micro investigation of the modification of WCO is not studied. In this paper, A reasonable molecular structure for WCO is created based on previous research findings firstly, which are fundamental and crucial for establishing the molecular model of bio-asphalt binder with various WCO contents. Then the molecular dynamics technology is employed to investigate the mechanical properties of asphalt binder with different WCO contents. The results show that the WCO softens the asphalt binder increasing with its content, which is consistent with the previous research, indicating that the simulated results characterize the mechanical properties of asphalt binder effectively and scientifically.
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