氧化石墨烯及多聚磷酸复合改性剂对沥青自愈合性能的影响  

Effect of graphene oxide and polyphosphoric acid composite modifier on self-healing performance of asphalt

作　　者：高颖[1] 邵力力 刘勇[2] 张晓雄 吕小博 GAO Ying;SHAO Lili;LIU Yong;ZHANG Xiaoxiong;LU Xiaobo(School of Civil Engineering,Hebei University of Engineering,Handan,Hebei 056000,China;Handan Transportation Bureau Expressway Construction Management Center,Handan,Hebei 056000,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056000 [2]邯郸市交通运输局高速公路建设管理中心,河北邯郸056000

出　　处：《中国科技论文》2024年第3期338-343,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(51508150);国家重点研发计划项目(2018YFF0300201)。

摘　　要：为了研究氧化石墨烯(graphite oxide,GO)和多聚磷酸(polyphosphoric acid,PPA)复合改性剂对沥青自愈合性能的影响,利用MaterialsStudio软件构建基质沥青和GO/PPA复合改性沥青的分子模型,通过密度、溶解度和玻璃化转变温度对建立的沥青模型进行合理性验证;在2组沥青之间插入1nm的真空层以表示疲劳损伤后产生的微裂缝,研究基质沥青和GO/PPA复合改性沥青在不同温度下的自愈合过程,并以扩散系数、活化能和指前因子为指标对两者的自愈合能力进行了评价;最后通过动态剪切流变试验验证模拟结果的准确性。结果表明:随着温度的升高,基质沥青和GO/PPA复合改性沥青中的微裂缝可以更快速修复;与基质沥青相比,GO/PPA复合改性沥青的扩散系数更大,因此具有更高的自愈合效率。研究成果有助于加深对GO/PPA复合改性剂自愈合效果的理解,为后续类似研究提供理论依据。In order to study the effect of graphite oxide(GO)and polyphosphoric acid(PPA)composite modifier on the self-healing performance of asphalt,the molecular models of matrix asphalt and modified asphalt were established by Materials Studio software.The asphalt model was verified by density,solubility and glass transition temperature,and a vacuum layer of 1 nm was inserted between the two groups of asphalt to represent the micro-cracks after fatigue damage.The self-healing process of matrix asphalt and GO/PPA modified asphalt at different temperatures was studied,and the self-healing ability of both asphalt and GO/PPA modified asphalt was evaluated by the mean square displacement,diffusion coefficient,activation energy and pre-exponential factor.Finally,the accuracy of the simulation results was verified by rheological test.The results show that micro-cracks in matrix asphalt and GO/PPA modified asphalt can be repaired more quickly with the increase of temperature,and the diffusion coefficient of GO/PPA modi⁃fied asphalt is higher than that of matrix asphalt,indicating a higher self-healing efficiency.The research results are helpful to deepen the understanding of the self-healing effect of GO/PPA composite modifier and provide a theoretical basis for the follow-up similar research.

关 键 词：氧化石墨烯 多聚磷酸 分子动力学 自愈合 

分 类 号：U414[交通运输工程—道路与铁道工程]