Defect detection using impact acoustic method in concrete models

Nowadays, the proper maintenance and renovation of existing concrete structures for irrigation and drainage have become important social problems. Thus, it is necessary to evaluate the wholesomeness of these structures and various kinds of non-destructive testing methods are used. In particular, due to the enormous number of the structures, a method which has both efficiency and accuracy is in high demand. In this study, a technique for defect detection using the impact acoustic method is presented for the purpose of improvements in inspection accuracy and its applicability is examined. This technique implements relative defect detection on impact sounds of the same structures based on the maximum amplitude and peak frequency. From the results of application to concrete models with defects, it was confirmed that this technique can detect the planar configuration of defects with relatively high accuracy.