한국건설순환자원학회논문집 (Journal of the Korean Recycled Construction Resources Institute)

한국건설순환자원학회 (Korean Recycled Construction Resources Institute)
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이중층수산화물을 혼입한 자기치유 시멘트 모르타르의 염화물 침투 저항성 회복 평가

Assessment of Recovery of Chloride Penetration Resistance of Self-healing Cement Mortars Containing Layered Double Hydroxide

  • 유경석 (한국교통대학교 교통대학원 교통시스템공학과) ;
  • 장승엽 (한국교통대학교 교통대학원 교통시스템공학과 )
  • Kyung Suk, Yoo (Department of Transportation System Engineering, Graduate School of Transportation, Korea National University of Transportation) ;
  • Seung Yup, Jang (Department of Transportation System Engineering, Graduate School of Transportation, Korea National University of Transportation)
  • 투고 : 2022.11.28
  • 심사 : 2022.12.22
  • 발행 : 2022.12.30
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초록

이 연구는 전기영동확산시험을 이용하여 이중층수산화물(LDH)을 혼입한 균열이 있는 자기치유 시멘트 모르타르의 염화물 침투 저항성을 평가하여 LDH가 자기치유 콘크리트의 치유 효과에 미치는 영향을 고찰하였다. 실험결과에 따르면 자기치유물질만 혼입한 경우와 자기치유물질과 Ca-Al LDH를 함께 혼입한 경우 균열 발생 직후 영동확산계수는 대부분 OPC 배합에 비해 더 컸지만, 치유재령이 경과할수록 OPC 보다 더 큰 폭으로 영동확산계수가 감소하며, Ca-Al LDH를 함께 혼입한 경우가 자가치유 물질만 혼입한 경우보다 영동확산계수 감소가 더 크게 나타나 더 높은 자기치유 성능을 보였다. 이는 균열면에 자기치유 반응생성물이 증가하면서 균열 내부에서 LDH에 의한 염소이온의 구속작용이 더 커진다는 것을 시사한다.

This study investigates the effect of layered double hydroxide (LDH) on the healing performance of self-healing concrete by assessing the chloride penetration resistance of self-healing cement mortars using electrical chloride ion migration-diffusion test. Test results show that both mortars containing healing materials only and mortars containing healing materials and Ca-Al LDH together mostly had higher migration-diffusion coefficients right after cracking, but the migration-diffusion coefficients decreased more than that of OPC with increasing healing ages, and thus, they yielded higher healing capacities than OPC. Also, mortars containing Ca-Al LDH together with healing materials showed higher reduction of their migration-diffusion coefficients, and thus, higher healing capacities than mortars containing healing materials only. This suggests that as the self-healing product increases on the crack surface, the binding of chloride ions by LDH inside the crack increases.

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과제정보

본 연구는 국토교통부 건설기술연구사업의 연구비 지원(22SCIP-C159059-03)에 의해 수행되었습니다.

참고문헌

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