Research on microscopic process and mechanism of modified asphalt based on phase field theory

The study of microscopic processes in modified asphalt is crucial for road engineering but has been challenged by difficulties and means limitations. The phase field model, on the other hand, can accurately simulate and track the evolution of the microscopic phase state of modified asphalt with respect to time, and by simulating the interactions and distribution of different asphalt components, we can predict the asphalt microscopic processes under different conditions. This paper reviews the application of phase field theory to microscopic phase separation, self-healing and fracture behavior of asphalt, and concludes with a brief summary and outlook on the current problems in the application of phase field theory to modified asphalt. •The phase field theory can accurately model and track the evolution of the microscopic phase state of modified bitumen over time, providing insight into the phase separation process.•Allen-Cahn kinetics and Navier-Stokes equations coupled with evolving phase field variables are used to simulate the self-healing process of asphalt.•The interactions and distribution of different components of asphalt are modeled by phase field theory to predict the fracture properties of asphalt under different conditions.