한국건설순환자원학회논문집 (Journal of the Korean Recycled Construction Resources Institute)

한국건설순환자원학회 (Korean Recycled Construction Resources Institute)
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표면탄성파를 활용한 콘크리트 균열 보수 성능 평가 기법

Evaluation of Crack-Repairing Performance in Concrete Using Surface Waves

  • 안은종 (울산과학기술원 도시환경공학부) ;
  • 김현준 (울산과학기술원 도시환경공학부) ;
  • 권성우 (울산과학기술원 도시환경공학부) ;
  • 심성한 (울산과학기술원 도시환경공학부) ;
  • 이광명 (성균관대학교 건설환경공학부) ;
  • 신명수 (울산과학기술원 도시환경공학부)
  • Ahn, Eunjong (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Kim, Hyunjun (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Gwon, Seongwoo (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Sim, Sung-Han (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Lee, Kwang Myong (School of Civil, Architectural and Environmental Engineering, Sungkyunkwan University) ;
  • Shin, Myoungsu (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST))
  • 투고 : 2017.11.13
  • 심사 : 2017.11.24
  • 발행 : 2017.12.30
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초록

본 연구의 목적은 콘크리트 구조물에 존재하는 균열의 깊이 및 보수 성능 평가에 표면탄성파 기반 비파괴 성능 평가 기술의 적용 가능성 및 유효성을 검토하는데 있다. 이를 위해, 콘크리트 배합비의 영향을 최소화하기 위하여 동일한 배합비와 서로 다른 균열 깊이(0, 15, 30, 45mm)를 가지는 사각형 모양의 표면탄성파 투과 시험용 실험체를 준비하였다. 투과계수와 스펙트럼에너지투과비는 표면탄성파 파라미터로써 본 연구에 균열 깊이 변화 및 보수 성능 평가에 활용하였다. 이 때, 균열 보수 성능평가를 위하여 실험체 균열면에 에폭시 주입 전/후로 각 5회씩 반복하여 표면탄성파 실험의 신뢰성을 높여주었다. 균열 깊이 증가에 따라 스펙트럼에너지투과비의 감소를 명확하게 확인하였다. 균열면이 완전하게 보수된 콘크리트 실험체에서 측정한 스펙트럼에너지투과비는 무균열 실험체에서 측정한 값에 대비하여 95% 수준으로 계측되어, 표면탄성파 기반 비파괴 시험 기법이 균열 보수 성능 평가 기술로 활용할 수 있을 것으로 사료된다.

The purpose of this study is to investigate the applicability of surface-wave techniques for the evaluation of the crack-repairing performance of an epoxy injection method in concrete. In this study, box-shaped concrete specimens with four different crack depths were made with identical mix proportions. The specimens with different crack depths were completely repaired using the same epoxy injection method. The spectral energy transmission ratio of surface waves is used as an index to differentiate the effects of crack depth and crack-repairing performance. The decrease of spectral energy transmission ratio in accordance with the increase of crack depth was identified before repairing. Furthermore, the spectral energy transmission ratio increased after the crack-repairing process in all specimens. The spectral energy transmission ratio is considered as a great indicator for estimating the crack-repairing performance of the epoxy injection method; the ratio was recovered up to almost 95% of the uncracked condition.

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참고문헌

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