利用冲击回波法检测混凝土结构缺陷的试验研究  

Experimental research on impact-echo method in detecting structural defects of concrete

作　　者：乔瑞社[1,2] 常芳芳[1,2] 冯敬辉 高玉琴[1,2] 校永志 余元宝[1,2] 

机构地区：[1]黄河水利科学研究院,郑州450003 [2]水利部堤防安全与病害防治工程技术研究中心,郑州450003 [3]郑州市轨道交通有限公司,郑州450003

出　　处：《南水北调与水利科技》2014年第6期106-111,共6页South-to-North Water Transfers and Water Science & Technology

基　　金：中央级公益性科研院所基本科研业务费专项资金资助(HKY-JBYW-2012-09)

摘　　要：通过采用冲击回波法对设置有不同内部缺陷的混凝土试件进行试验研究,获得该方法检测混凝土内部缺陷的识别方法和缺陷范围测定方法。研究结果表明:采用冲击回波法测试混凝土内部缺陷时,横向尺寸与缺陷深度比值小于1∶4的缺陷及缺陷横向尺寸小于50mm,且与埋深比值大于1∶1时,缺陷不易被识别。探头移动过程中观察主频峰值的变化可以有效测定缺陷范围,但是缺陷深度的确定与实际试验条件有较大关系。The impact-echo method was conducted on the concrete specimens with different internal defects,and the identification and determination methods for imperfection in concrete specimen were obtained.The test results showed that it is difficult to identify the defects in concrete specimen when the ratio between lateral dimensions and depth is less than 1 ∶ 4,the lateral dimensions are less than 50 mm,and the ratio between lateral dimensions and depth is greater than 1 ∶ 1.The scope of defects can be effectively measured by observing the variation of peak value of frequency; however,the determination of defect depth is related to the actual test conditions.

关 键 词：冲击回波法 低频应力波 混凝土内部缺陷 缺陷识别 

分 类 号：TU375[建筑科学—结构工程]