Jaehak Park/Seongbaek Park/Yujin Lim
International Journal of Railway, vol. 11, no. 2, pp.39-44, 2018

Abstract : In the case of concrete slab track, construction sites have steadily increased since the opening of the second stage of the Gyeongbu Express Railway in 2008. Even though it has many advantages in respects of maintenance and track safety, unlike the initial healthy concrete track condition, defects have been found recently. Therefore, it is necessary to develop a new detection system capable of checking the defects and of performing logical decision-making process for the trackbed condition based on NDT. In this study, an impact echo test was introduced to check the possibility of developing a new NDT system for investigating cavities underneath the concrete slab track. For this purpose, small concrete slabs were constructed in backyard and have been tested by the newly proposed NDT system with impact echo. It has been shown that the new NDT system can be adapted for condition monitoring to check cavities underneath the concrete slab track.

Keyword : Concrete trackbed, Impact echo, NDT, STFT, Simple model test