复杂环境因素影响下沥青混合料自愈合性能  

Self-healing Properties of Asphalt Mixture under Different Factors

作　　者：崔亚楠[1] 郭靖 冯蕾[1] 孙广宁 CUI Ya nan;GUO Jing;FENG Lei;SUN Guangning(College of Civil Engineering,Inner Mongolia University of Technology,Huhhot 010051,China;Inner Mongolia Comprehensive Transportation Research Institute,Huhhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,内蒙古呼和浩特010051 [2]内蒙古综合交通科学研究院,内蒙古呼和浩特010051

出　　处：《建筑材料学报》2018年第5期836-840,共5页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51568054);内蒙古自治区研究生科研创新项目(S20171012808);内蒙古自治区自然科学基金资助项目(2017MS(LH)0102)

摘　　要：通过半圆弯拉试验,以断裂能密度为愈合指标,分别研究了沥青种类、损伤程度、老化程度、愈合温度及愈合时间对沥青混合料自愈合性能的影响,并运用数字散斑技术对其损伤和自愈合过程进行了观测.结果表明:损伤程度对沥青混合料的自愈合能力影响最为显著;胶粉改性沥青混合料的自愈合效果最好;损伤程度和老化程度对自愈合能力起负面作用;当提高愈合温度时,沥青混合料的自愈合能力增强;随着愈合时间的增加,沥青混合料自愈合速度相对降低;基质沥青混合料经过短期老化后裂缝自愈合速度最快.Through the semi-circular bending test,the five influence factors such as the asphalt type,damage degree,aging degree,healing temperature and healing time were analyzed for the self-healing properties of asphalt mixture when the fracture energy density as a healing index.The damage and healing process of the specimens were observed by digital speckle technique.The results indicate that the damage degree has the most significant influence on self-healing ability of asphalt mixture.The self-healing effect of crumb rubber modified asphalt mixture is the best.The damage degree and aging degree have a negative effect on the self-healing ability.When the healing temperature is increased,the self-healing ability of asphalt mixture is enhanced.The self-healing speed is decreased with the increase of the healing time.The crack self-healing rate of the matrix asphalt mixture after short-term aging is the highest.

关 键 词：沥青混合料 自愈合 正交试验 半圆弯拉试验 数字散斑技术 

分 类 号：U414[交通运输工程—道路与铁道工程]