老化条件下基于分子模拟的SBS改性沥青自愈合性能研究  

Study on self-healing properties of SBS-modified asphalt under aging conditions based on MD simulation

作　　者：曹佃光 张伟 张伟光[2] 祝铭阳 CAO Dianguang;ZHANG Wei;ZHANG Weiguang;ZHU Mingyang(CCCC First Harbor Engineering Company Limited,Tianjin 300222,China;School of Transportation,Southeast University,Nanjing 211189,China)

机构地区：[1]中交第一航务工程局有限公司,天津300222 [2]东南大学交通学院,江苏南京211189

出　　处：《辽宁工程技术大学学报(自然科学版)》2024年第6期42-51,共10页Journal of Liaoning Technical University (Natural Science)

基　　金：国家重点研发计划项目(2020YFA0714302)。

摘　　要：为研究老化对苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青自愈合能力的影响,建立SBS改性沥青分子模型,并通过计算玻璃化转变温度、内聚能密度、溶解度参数验证其合理性。在此基础上,建立SBS改性沥青自愈合模型,评价不同老化条件下SBS改性沥青的自愈合性能。研究结果表明:常温条件下,沥青老化和SBS老化均会降低SBS改性沥青的自愈合能力,其中,沥青老化对SBS改性沥青自愈合能力的影响较大,SBS老化对改性沥青自愈合能力的影响较小。与“基质沥青+SBS”自愈合模型相比,“老化沥青+老化SBS”自愈合模型的裂纹修复时间明显延长。对沥青进行再生恢复是改善老化后沥青混合料裂纹修复性能的关键。研究结果为优化道路沥青材料的开发设计提供理论参考。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.

关 键 词：苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青 老化 自愈合性能 浓度剖面 分子动力学模拟 

分 类 号：TU535[建筑科学—建筑技术科学]