聚合物改性沥青微观机理、表征与性能调控研究综述OA

Polymer modified asphalt(PMA)can significantly improve the comprehensive performance of pavement materials by constructing polymer-asphalt composite microstructures.However,the compatibility,phase evolution and long-term storage stability between polymers and asphalt are still key issues that constrain their engineering applications.This study reviewed the modification mechanism,characterization techniques and performance control methods of PMA from a microscopic perspective:focusing on clarifying microscopic mechanisms such as physical swelling,chemical cross-linking and phase evolution;The application and limitations of microstructure analysis,chemical spectroscopy techniques and molecular dynamics simulation methods in revealing the phase structure,interface interactions and aging pathways of PMA were reviewed.On this basis,3 types of performance control methods were summarized including physical blending,chemical modification and nanocomposite modification,and effective approaches for constructing PMA with high stability and durability were summarized.The existing research results show there are still shortcomings in the quantitative characterization of microstructure and accurate analysis of interface behavior in current PMA research.In the future,in-situ and dynamic characterization techniques applicable to real operating conditions should be key developed,the deep integration of molecular simulation and experimental data be promoted,and multi-scale correlation models be established to achieve accurate prediction and regulation from molecular structure design to material service performance.