Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Evaluation Method of Self-healing Performance of Cement Composites

시멘트 복합체의 자기치유 성능평가 방법

  • Lee, Kwang-Myong (Department of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University) ;
  • Kim, Hyung-Suk (Department of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University) ;
  • Min, Kyung-Sung (Department of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University) ;
  • Choi, Sung (Self-healing Green Concrete Research Center, Sungkyunkwan University)
  • 이광명 (성균관대학교 건설환경시스템공학과) ;
  • 김형석 (성균관대학교 건설환경시스템공학과) ;
  • 민경성 (성균관대학교 건설환경시스템공학과) ;
  • 최성 (성균관대학교 자기치유 친환경 콘크리트 연구센터)
  • Received : 2020.02.26
  • Accepted : 2020.03.26
  • Published : 2020.03.30
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Abstract

In this study, in order to evaluate the self-healing performance of cement composites the self-healing test method and the analysis method were suggested by applying constant water head permeability test, chloride migration test and repeated bending test. The method of making a cracked specimen and controlling crack width are also proposed. Constant head water permeability test can evaluate the healing performance by using the decreasing rate of water flow passing through the crack zone of a specimen. Furthermore, the equivalent crack width can be used to intuitively investigate the healing effect with healing period. The chloride migration test can evaluate the healing rate by the decreasing rate of the diffusion coefficient obtained by ASTM C 1202. Mechanical healing performance can be evaluated using ISR and IDR estimated from load vs. CMOD relationship graph obtained through the repeated bending test. Finally, the applicability of proposed self-healing evaluation methods was examined by testing mortar specimens with or without self-healing agents.

본 연구에서는 시멘트 복합체의 자기치유 성능평가를 위해 정수위투수시험, 염소이온 확산시험, 반복휨시험을 활용한 시험방법 및 분석방법을 제시하였고, 균열 유발방법과 균열폭 제어방법을 제안하였다. 정수위 투수시험은 시험체의 균열부를 통과하는 단위유출수량의 감소율을 이용하여 치유성능을 평가하는 시험방법으로 등가 균열폭을 활용하여 치유재령에 따른 치유효과를 직관적으로 규명할 수 있다. 염소이온 확산계수시험은 ASTM C 1202의 시험장치를 활용하여 구한 염소이온 확산계수의 감소율로 치유율을 평가하는 방법이다. 또한, 반복 휨 시험을 통하여 얻은 하중과 CMOD의 관계 그래프로부터 강도회복지수(ISR)과 손상복구지수(IDR)을 산정하여 역학적 치유성능을 평가할 수 있다. 마지막으로, 자기치유 소재의 혼입 유무에 따른 균열 시험체의 실험을 통해 본 연구에서 제시한 자기치유 평가방법의 적용성을 검토하였다.

Keywords

References

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