树脂基碳纤维智能层检测混凝土梁裂缝  

Crack detection of concrete beams by polymer based carbon fiber smart layers

作　　者：邓友生[1] 李卓球[2] 吕泳[2] 刘冬[3] 

机构地区：[1]湖北工业大学土木工程与建筑学院,湖北武汉430068 [2]武汉理工大学理学院,湖北武汉430070 [3]武汉钢铁(集团)公司研究院检测中心,湖北武汉430080

出　　处：《华中科技大学学报（自然科学版）》2010年第2期94-96,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10672128)

摘　　要：针对现行规范对混凝土结构裂缝宽度的控制要求,根据碳纤维智能层的传感特性,采用单调弯拉的试验方法,并对无预制裂缝的混凝土梁试件裂缝是否产生进行判断试验,对有预制裂缝的混凝土梁试件表面裂缝宽度进行检测试验.试验结果表明：碳纤维智能层可通过其电阻的突变感知混凝土梁初始裂缝的发生;在试件表面缝宽度为0-0.6 mm时,碳纤维智能层的电阻随试件表面裂缝宽度的增大而呈线性增大的变化规律.Crack widths of concrete structures should be controlled by the current codes.In consideration of the sensibility of carbon fiber smart layers,the tests were carried out to decide whether or not the cracks by means of monotonic wend-tension of concrete beams without crack prefabricated.The crack widths of tested beam′s surface with prefabricate crack were decided.Experimental results indicate that carbon fiber smart layer can sense concrete initial crack by sudden change of its electrical resistance value,and the value of carbon fiber smart layer is linear with width of concrete surface crack as breadth of concrete surface crack varies from 0 to 0.6 mm.

关 键 词：混凝土梁 碳纤维智能层 裂缝 检测 电阻 

分 类 号：U445.7[建筑科学—桥梁与隧道工程] TU37[交通运输工程—道路与铁道工程]