Detection of Defects in Reinforced Concrete Surface Layer by Using Non-Destructive Testing Method

Abstract

In recent years, the relationship between the long-term durability and accumulation of cracking damage in reinforced concrete agricultural infrastructure has been discussed as a technical problem. The purpose of this study is to experimentally investigate the relationship between the frequency response and the defects including cracking damage in a reinforced concrete surface layer, applying resonance vibration and X-ray computed tomography (CT) methods. Prior to the resonance vibration test, distribution of micro-cracks in testing samples were inspected by helical X-ray CT. Then, accelerated degraded samples were tested. Thus, the decrease tendency of the resonance frequency was confirmed in degraded samples. A relation between resonance vibration characteristics and defects is correlated, and the development of defects of reinforced concrete surface is detected by resonance vibration method.