Railroad concrete track is continuously supporting structure for repeated impact loads. Fine cracks which occurred in the early stage of the train operation, gradually expanded depending on the tonnage increases, and the function of the slab track is reduced. And, occurrence of track irregularity, worsening of ride comfort and interfere with the safe operation of trains would be follows. Therefore, management and maintenance of the initial crack is very important, railroad maintenance overhaul organizations detected twice a year or more the cracks and paint it, displays the location and severity, the type of cracks, width and length by creating a developed view.
Each year much maintenance works is required for checking the crack of concrete trackbed and sleepers.

• 이지하(한국철도기술연구원, 고속철도인프라연구단 선임연구원, 공학박사) | Lee, Jeeha 교신저자
• 엄기영(한국철도기술연구원, 고속철도인프라연구단 수석연구원, 공학박사) | Eum, Ki Young
• 강윤석(한국철도기술연구원, 고속철도인프라연구단 책임연구원, 공학박사) | Kang, Yoon-Suk
• 최찬용(한국철도기술연구원, 고속철도인프라연구단 선임연구원, 공학박사) | Choi, Chan-Yong