老化条件下基于分子模拟的SBS改性沥青自愈合性能研究OA北大核心CSTPCD

To investigate the effect of aging on the self-healing ability of styrene-butadiene-styrene block copolymer(SBS)-modified asphalt,a molecular model of SBS-modified asphalt was established.The reasonableness of the model was verified by calculating the glass transition temperature,cohesive energy density,and solubility parameter.Based on this,a self-healing model for SBS-modified asphalt was developed to evaluate its self-healing performance under different aging conditions.The results show that both asphalt aging and SBS aging will reduce the self-healing ability of SBS modified asphalt at room temperature.Notably,asphalt aging has a more significant impact on the self-healing ability of SBS-modified asphalt,while the effect of SBS aging is relatively minor.Compared to the self-healing model of"matrix asphalt+SBS",the crack repair time in the"aging asphalt+aging SBS"self-healing model is significantly extended.Rejuvenation of asphalt is crucial for improving the crack repair performance of aged asphalt mixtures.The research results provide theoretical reference for the development and design optimization of road asphalt materials.