Feasibility of detecting embedded cracks in concrete structures by reflection seismology

Reflection seismology has been widely used in the petroleum exploration ind ustry for decades. To improve the capabilities of detecting the depths and lengths of cracks inside a concrete element, an ultrasonic common depth poi nt (CDP) reflection technique was employed in this study. The effectiveness and accuracy of applying the reflection seismology method to detect cracks embedded in concrete structures are discussed. Test results show that simu lated blind cracks with certain lengths, dip angles and depths inside concr ete specimen can be successfully imaged and identified. This study shows th at when the signals reflected from the crack are obscure, the CDP signal st acking method is very useful and provides an opportunity to look into the o bject, which is not possible with traditional ultrasonic methods. (C) 2001 Elsevier Science Ltd. All rights reserved.