老化作用下沥青混合料的疲劳及自愈合性能  

Fatigue and Self-healing Properties of Asphalt Mixture under Effect of Aging

作　　者：陈瑞璞 崔亚楠[1] 冯蕾[1] CHEN Ruipu;CUI Yanan;FENG Lei(College of Civil Engineering,Inner Mongolia University of Technology,Huhhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院

出　　处：《建筑材料学报》2019年第3期487-492,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51568054);内蒙古自然科学基金资助项目(2018MS05053);内蒙古自治区高等学校“青年科技英才计划”(NJYT-19-A19)

摘　　要：通过四点弯曲疲劳试验,分析了老化作用下苯乙烯丁二烯苯乙烯三嵌段共聚物(SBS)改性沥青混合料和基质沥青混合料的疲劳及自愈合性能.结果表明:老化作用显著削弱了沥青混合料的抗疲劳性能,SBS改性沥青混合料的抗疲劳性能优于基质沥青混合料;老化程度和损伤程度对沥青混合料的自愈合能力影响最为显著;适当延长愈合时间和适宜的愈合温度可以提高沥青混合料的愈合率,但老化程度和损伤程度会削弱其自愈合能力;未老化条件下,基质沥青混合料的自愈合能力大于SBS改性沥青混合料,而老化条件下SBS改性沥青混合料表现出较强的自愈合能力.因此选用SBS改性沥青混合料作为路面材料可以提高沥青路面的抗疲劳及自愈合性能.The four-point bending fatigue test was used to analyse the fatigue and self-healing properties of two asphalt mixtures under aging condition. The results show that aging weakens anti-fatigue performance significantly,and the styrene-butadiene-styrene tri-block copolymer(SBS) modified asphalt mixture has better anti-fatigue performance than matrix asphalt mixture. The degree of aging and damage influence the healing ability of asphalt mixture significantly. Prolonging the healing time and healing appropriate temperature can improve the healing rate of asphalt mixture,while aging degree and damage degree can weaken the self-healing ability. Under the unaged condition,the matrix asphalt mixture has a better self-healing ability than SBS modified asphalt mixture,but under aging condition,the SBS modified asphalt mixture has a better self-healing ability,so using SBS modified asphalt mixture as pavement material can improve the anti-fatigue and self-healing properties of the asphalt pavement.

关 键 词：沥青混合料 疲劳性能 自愈合性能 

分 类 号：U414.1[交通运输工程—道路与铁道工程]