不同愈合效率下钢渣沥青混合料再开裂行为研究  

Study on Re-cracking Behavior of Steel Slag Asphalt Mixture atDifferent Healing Efficiencies

作　　者：徐洪跃 郭鹏展 陈雪琴 姚波 XU Hongyue;GUO Pengzhan;CHEN Xueqin;YAO Bo(Henan Jiaotou Pingwan Expressway Co.,Ltd.,Zhengzhou,Henan 450018,China;Department of Emergency Support,School of Safety Science and Engineering,Nanjing University of Science&Technology,Nanjing,Jiangsu 210094,China)

机构地区：[1]河南交投平宛高速公路有限公司,河南郑州450018 [2]南京理工大学安全科学与工程学院应急保障系,江苏南京210094

出　　处：《公路工程》2024年第5期167-174,188,共9页Highway Engineering

基　　金：河南省交通运输厅科技项目(2021:-2-5);国家自然科学基金资助项目(52208439);江苏省自然科学基金资助项目(BK20200468)。

摘　　要：钢渣是一种绿色低碳的建筑材料,近年来被广泛应用到道路工程的建设中。应急保障钢渣沥青混合料在不承受外荷载的情况下,会发生一定程度的自愈合。为探究不同微波加热愈合效率对钢渣沥青混合料性能的影响,基于CT扫描图像处理方法,建立了微波加热修复后的钢渣沥青混合料离散元数值模型,分析了钢渣沥青混合料在不同愈合效率下(80%、60%、40%、20%)的力学响应,研究了不同愈合效率下裂纹的数量及发展情况。研究结果表明:基于离散元虚拟试验得到的荷载位移曲线与半圆弯曲试验所得到的荷载位移曲线吻合度良好。随着愈合效率的降低,试件承受的极限荷载逐渐降低,疲劳寿命逐渐降低,裂纹数量逐渐增多。裂纹数量在试件达到极限承载力时急速增长,此后裂纹数量增长较为缓慢。Steel slag is a green low-carbon building material,and it has been widely used in the construction of road projects in recent years.Steel slag asphalt mixture can self-heal to a certain extent while not bearing external load.To investigate the influence of different healing efficiency on the performance of steel slag asphalt mixture,a discrete element model(DEM)was established based on the CT scanning image processing method in this study.The mechanical response of steel slag asphalt mixture specimens with different healing efficiency(80%,60%,40%,20%)was analyzed,and the number and behavior of cracks at different healing efficiency was tracked.The results showed that the load-displacement curve obtained from the virtual discrete element simulation was in good agreement with the load-displacement curve obtained from the semi-circular bending test.With the decrease of healing efficiency,the ultimate load and fatigue life of the semi-circular specimen decreased and the number of cracks increased gradually.When the load reaches the ultimate bearing capacity,the crack grew rapidly,and the number of cracks grew slowly after this period.

关 键 词：不同愈合效率 钢渣沥青混合料 离散元 再开裂 半圆弯曲试验 

分 类 号：U414[交通运输工程—道路与铁道工程]