This research aims to detect delamination-like damage from asphalt-concrete interface using contactless ultrasonic technique. FEM simulation and experiments demonstrate that surface waves and S mode are strongly present when there is delamination-like damage. It is believed that the measurement of S mode by non-contact ultrasonic system will allow one to determine the existence of delamination-like damage from bridge decks.

Abstract
 1. 서 론
 2. 실험계획 및 방법
  2.1. 실험계획
  2.2. 실험방법
 3. 결 론

• 최하진(숭실대학교 건축학부) | Choi Hajin
• 홍진영(숭실대학교 건축학부) | Hong Jinyoung
• 김현진(숭실대학교 건축학부) | Kim Hyunjin
• 민지영(한국건설기술연구원) | Min Jiyoung
• 진승섭(한국건설기술연구원) | Jin Seung-Seop