Review of interfacial adhesion between asphalt and aggregate based on molecular dynamics

Asphalt materials are uneven and complex organic matter, and the properties of asphalt-aggregate interfaces are also complex. This makes it difficult for researchers to understand the properties and behavior of an asphalt -aggregate interface. Asphalt-aggregate interface is the bridge hub between asphalt and aggregate, and its lousy interaction is closely related to pavement cracking, water damage, permanent deformation, and other diseases. Therefore, it is necessary to study the asphalt-aggregate interface for the maintenance and application of asphalt pavement. This study reviews the research status of molecular dynamics simulation of the asp-halt-aggregate interface, including modeling, evaluation index, influencing factors, and interface improvement. This paper discusses the typical asphalt binders and asphalt-aggregate interface models with different compo-sitions, which is a key part of the simulation design, as well as their differences with real samples and the feasibility based on basicity and quality. Studies on the molecular model are reviewed and discussed with respect to their classification. This paper summarizes the advantages and disadvantages of using the molecular dynamics simulation method in the study of the asphalt-aggregate interface. The results show that molecular dynamics has a broad application prospect in studying the interface. The research results of this paper can provide reference and guidance for subsequent scholars to study further the behavior of asphalt-aggregate interface by molecular dynamics method and also provide a reference for the study of the polymer-solid interface.