沥青混合料损伤愈合性能的多尺度评价  

Multi Scale Evaluation of Damage Healing Performance of Asphalt Mixture

作　　者：崔亚楠[1] 李雪杉 吴华信 张淑艳[1] CUI Yanan;LI Xueshan;WU Huaxin;ZHANG Shuyan(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 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

出　　处：《建筑材料学报》2021年第2期432-439,共8页Journal of Building Materials

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

摘　　要：采用宏观与细观相结合的方法评价了沥青混合料的损伤愈合性能,以半圆弯拉试验为基础,同时使用数字散斑相关法(DSCM)研究了老化程度、损伤度、愈合时间和愈合温度对沥青混合料损伤愈合性能的影响.结果表明:宏观与细观指标的变化规律表现出相似特征;随着老化程度的加深,苯乙烯丁二烯苯乙烯嵌段共聚物(SBS)改性沥青混合料的损伤愈合性能逐渐变差,基质沥青混合料损伤愈合性能变化不明显,长期热老化后沥青混合料的愈合率与经过紫外复合老化后的沥青混合料接近;随着损伤度的加深,基质沥青混合料与SBS改性沥青混合料的损伤愈合性能明显降低,基质沥青混合料的损伤愈合性能优于SBS改性沥青混合料,SBS改性沥青混合料的损伤愈合性能受损伤度的影响更显著;愈合温度越高,愈合时间越长,沥青混合料的损伤愈合性能越好.The damage healing performance of asphalt mixture was evaluated by combining macro and micro methods.Based on the semicircular bending tensile test,the effects of aging degree,damage degree,healing time and healing temperature on the damage healing performance of asphalt mixture were studied by digital speckle correlation method(DSCM).The results show that the macro and micro indexes change with similar characteristics.With the deepening of aging degree,the damage healing performance of styrene-butadiene-styrene(SBS)modified asphalt mixture gradually deteriorates,and the change of the damage healing performance of base asphalt mixture is not obvious.The healing rate of asphalt mixture after thermal aging is close to that of asphalt mixture after ultraviolet combined aging.With the deepening of the damage degree,the damage healing performance of base asphalt mixture and SBS modified asphalt mixture is significantly reduced.The damage healing performance of base asphalt mixture is better than that of SBS modified asphalt mixture,and the damage healing performance of SBS modified asphalt mixture is more significantly affected by the damage degree.The higher the healing temperature and the longer the healing time,the better the damage healing performance of asphalt mixtures.

关 键 词：沥青混合料 愈合性能 数字散斑相关法 位移场 半圆弯拉试验 

分 类 号：U414[交通运输工程—道路与铁道工程]