利用冲击回波法检测混凝土结构缺陷的试验研究

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。

Experimental research on impact2echo method in detecting structural defects of concrete

The impact2echo method w as conducted o n the concrete specimens w ith differ ent inter nal defect s, and the ident ificatio nand determination methods for imper fect ion in co ncr et e specimen w ere obtained. T he test r esults showed that it is difficult toidentif y the defects in co ncrete specimen w hen the r at io betw een lat eral dimensions and depth is less than 1B4, the lateral dimen2sio ns ar e less than 50 mm, and the r atio betw een lateral dimensio ns and dept h is g reater t han 1B1. The sco pe o f defects can beeffectively measur ed by o bserv ing the var iatio n o f peak value of frequency; howev er, the determinatio n of defect dept h is r elatedto the actual test co ndit ions.