粗集料棱角性对沥青混合料抗拉性能影响的虚拟试验研究  

Virtual experimental study on the effect of coarse aggregate angularity on tensile performance of asphalt mixtures

作　　者：李强[1,2] 张卓宇 罗桑 高磊[4] LI Qiang;ZHANG Zhuoyu;LUO Sang;GAO Lei(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;National-Provincial Joint Engineering Research Center of Electromechanical Product Packaging,Nanjing 210037,China;Intelligent Transportation System Research Center,Southeast University,Nanjing 211189,China;College of Civil Aviation and Flight,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037 [2]机电产品包装生物质材料国家地方联合工程研究中心,江苏南京210037 [3]东南大学智能运输系统研究中心,江苏南京211189 [4]南京航空航天大学民航/飞行学院,江苏南京210016

出　　处：《铁道科学与工程学报》2020年第6期1429-1435,共7页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51908286);江苏省基础研究计划(自然科学基金)资助项目(BK20181404);江苏高校“青蓝工程”资助项目(苏教师(2016)15号);南京林业大学“青年骨干教师培养对象”资助项目(2017年)。

摘　　要：为评价粗集料形态特征对沥青混合料抗拉性能的影响,结合CT扫描技术和有限元方法建立虚拟间接拉伸试验。通过虚拟试验对不同类型沥青混合料的间接拉伸劲度模量和粗集料运动轨迹进行仿真分析,建立粗集料棱角性与其抗拉性能及运动轨迹的相关关系。研究结果表明:粗集料棱角性指标与沥青混合料间接拉伸劲度模量之间存在一定的正相关性,与粗集料平均平动位移量及平均主轴方向增量存在一定的负相关性,但是其相关关系均依赖于级配类型。与AC-20混合料相比,AC-13混合料粗集料棱角性指标略小且分布更为集中,试验后其粗集料普遍产生了更大幅度的平动和转动变形,从集料形态特征和运动轨迹角度均证实其具有更优的抗拉性能。The computer tomography scanning technique and finite element method were used to develop the virtual indirect tensile test to evaluate the effect of coarse aggregate morphology on tensile performance of asphalt mixtures.The indirect tensile stiffness and aggregate movement track of asphalt mixtures were simulated.Correlations between coarse aggregate angularity and tensile performance or movement track were obtained.It is found that the angular index of coarse aggregates positively correlate with the indirect tensile stiffness and negatively correlate with the average translation displacement and average increment of the principle axis direction.However,correlations were dependent on gradation types.Compared with the AC-20 mixture,the angular index values of the AC-13 one is slightly lower and the distribution is more concentrated.There are larger translation and rolling displacements for coarse aggregates of the AC-13 mixtures after testing,which is proved to have better tensile performance from the perspective of aggregate shape characteristics and movement track.

关 键 词：沥青混合料 有限元法 间接拉伸 棱角性 运动轨迹 

分 类 号：U416.2[交通运输工程—道路与铁道工程]