earticle

영어

Concrete cracks are early indicators of material performance degradation and defects, and concrete crack monitoring is an important technique that helps to reduce maintenance costs and improve the performance and safety of concrete structures. Existing techniques, including visual inspection, are based on the surface crack images or ultrasonic velocity differences and have limitations to find internal cracks (e.g., concrete delamination and flexural cracks). Therefore, in this study, a detection system was developed using wave attenuation of guided waves for detecting concrete internal cracks. The system was verified through finite element analysis and crack exploration experiments in concrete hume pipes. The surface cracks showed more wave energy attenuation than the internal cracks since the surface waves transmit higher energy than the body waves resulting in more energy reflection and scattering. On the other hand, in the case of internal cracks. As a result, it showed sufficient sensitivity to detect both surface and internal cracks and can be developed into a crack evaluation system with a damage index in the future.