Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Correlation between Crack Width and Water Flow of Cracked Mortar Specimens Measured by Constant Water Head Permeability Test

정수위 투수시험에 의해 측정된 균열 모르타르 시편의 유출수량과 균열폭의 상관관계

  • Choi, Seul-Woo (Self-healing Green Concrete Research Center, Sungkyunkwan University) ;
  • Bae, Won-Ho (Civil, Architectural and Environmental System Engineering, Sungkyunkwan University) ;
  • Lee, Kwang-Myong (Civil, Architectural and Environmental System Engineering, Sungkyunkwan University) ;
  • Shin, Kyung-Joon (Department of Civil Engineering, Chungnam National University)
  • 최슬우 (성균관대학교 자기치유친환경콘크리트 연구센터) ;
  • 배원호 (성균관대학교 건설환경시스템공학과) ;
  • 이광명 (성균관대학교 건설환경시스템공학과) ;
  • 신경준 (충남대학교 토목공학과)
  • Received : 2016.12.12
  • Accepted : 2017.03.17
  • Published : 2017.06.30
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Abstract

Recently, the researches of self-healing concrete technology are being carried out actively due to the advent of importance for the maintenance of concrete structures. A water permeability test has been widely used for the evaluation of self-healing performance. However, it is difficult to compare tests results since there is no standard test method related to the self-healing. A standard method for measuring the crack width does not exist neither though the self-healing performance is significantly influenced by the initial crack width. In this study, the effect of water head and crack width on water flow was investigated using a constant water head permeability test equipment. The correlation equation between the initial crack width and water flow was suggested through the regression analysis of test data, and the predicted crack widths agree well with the real crack widths measured using microscopy.

최근 콘크리트 구조물의 유지보수 문제가 대두되면서 구조물에 발생하는 균열을 스스로 치유하는 자기치유 기술이 활발히 연구되고 있다. 현재 자기치유 콘크리트의 치유 성능 평가에 투수시험이 널리 사용되지만, 이와 관련된 표준화된 방법이 없어 시험결과의 비교에 어려움이 있다. 또한 콘크리트의 자기치유 성능은 초기 균열폭에 큰 영향을 받는데, 콘크리트의 균열폭 측정을 위한 표준화된 방법도 없는 실정이다. 따라서 본 연구에서는 정수위 투수시험 장치를 이용하여 수두차와 균열폭이 유출수량에 미치는 영향을 분석하였다. 또한 투수 실험 결과의 회귀 분석을 통해 유출수량과 초기 균열폭의 상관관계식을 제안하였으며, 제안된 식을 이용하여 예측한 모르타르 시편의 균열폭이 광학현미경을 이용하여 측정한 실제 균열폭과 잘 일치하는 결과를 얻었다.

Keywords

References

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