导电沥青混凝土的机敏特性  

Smart characteristics of conductive asphalt concrete

作　　者：刘小明[1] 吴少鹏[2] 杨小礼[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]武汉理工大学硅酸盐材料工程教育部重点实验室,湖北武汉430070

出　　处：《中南大学学报（自然科学版）》2009年第5期1465-1470,共6页Journal of Central South University:Science and Technology

基　　金：湖北省杰出青年基金资助项目(2004ABB019);教育部新世纪优秀人才支持计划项目(NCET-05-0665)

摘　　要：采用间接拉伸疲劳试验对圆柱体试件的机敏特性进行探讨;通过受拉时的疲劳特性与电性能的对应关系,由电学性能逆推疲劳寿命,实现健康状况自诊断。研究结果表明:导电沥青混凝土能够有效地对其自身在加载过程中产生的应变进行诊断,输出电阻随着应变的增加而可逆地增加,随着应变的减小而可逆地减小;导电沥青混凝土受压后,先后经历追密、稳定和破坏3个阶段,其输出电阻率也会发生相应变化,电阻率和内部结构之间存在一定响应关系;电阻率的变化与其内部的载流子浓度成反比,可据单位体积内载流子浓度的变化进行自诊断。The smart behavior of cylinder specimen was studied using indirect tensile test.By the relationship among tension,fatigue and electrical properties,the electrical properties reverse fatigue life was deduced,and health status of self-monitoring was realized.The results show that conductive asphalt concrete is effective for strain monitoring.The electrical resistance increases reversibly with the increase of tensile strain,decreases reversibly with the decrease of tensile strain.The resistance change can be divided into three phases through fatigue process.It has response relation between resistivity and interior structure.The change of resistivity is inversely proportional to unit volume carrier concentration.The mechanism of self-monitoring is caused by the change of the number of electronic carriers.

关 键 词：沥青混凝土 自诊断 间接拉伸 电阻率 

分 类 号：TU528.42[建筑科学—建筑技术科学]