寒区道路Top-Down裂缝成因分析  

Study on Cause of Top-Down Cracks Formation in Cold Regions

作　　者：肖卓 黄勇[1] 李展 李邵辉 王泳丹 王春[1] 

机构地区：[1]长安大学道路结构与材料交通行业重点实验室,西安710064 [2]中国水利水电第七工程局有限公司,成都610081

出　　处：《武汉理工大学学报（交通科学与工程版）》2018年第1期35-38,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家重大科学仪器设备开发专项项目(2013YQ160501);巴基斯坦PKM4项目资助

摘　　要：基于Top-Down裂缝病害路段区分路况(优、中、差)现场钻取的芯样和路面板,室内分层(上、中、下面层)切割试件进行沥青抽提后三大指标试验、OT试验及小梁弯曲试验,对寒区TopDown裂缝成因进行分析.试验结果表明,沥青结合料老化和混合料低温疲劳、低温收缩均为寒区Top-Down裂缝产生的原因.In the disease road with Top-Down cracks,the core samples and pavement slabs are drilled and selected in different road conditions（excellent,medium and poor）.The test of three major indexes（penetration,ductility,softening point）after asphalt extraction test,the OT test and the trabecular bending test are conducted on the samples cut into three layers（upper layer,middle layer,and lower layer）to analyze the cause of Top-Down cracks in cold regions.The test results show that the aging of asphalt binder,the fatigue and shrinkage at low temperature of the mixture are the causes of the Top-Down cracks formation in cold regions.

关 键 词：Top-Down裂缝 芯样 路面板 沥青抽提 OT试验 小梁弯曲试验 

分 类 号：U414[交通运输工程—道路与铁道工程]