Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Corrosion Resistance of Blended Concrete and Its Application to Crack Healing

혼합 콘크리트의 부식 저항성과 균열 치유 적용

  • 이창홍 (한국건설기술연구원) ;
  • 김태상 (한국건자재시험연구원) ;
  • 송하원 (연세대학교 사회환경시스템공학부)
  • Published : 2009.12.31
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Abstract

In this study, electro-deposition method was applied to heal cracks in various blended concrete. The performance of the method was indirectly monitored by measuring impressed voltage, electrolyte, galvanic current monitoring, linear polarization resistance, and directly by image analysis of the cracks. The indirect and direct monitoring values are compared to develop guidelines for relating the indirect measures to actual crack healing. As a result, It was found that impressed voltage was convergence to 2.9V after 20000 minutes. From the galvanic current test results of artificial crack healing, the corrosion resistance showed that the order of 0.4 $>$ 0.6 $>$ 0.5 water to cement ratio. Furthermore, in view of binder, the corrosion resistance order was calculated OPC $>$ 60%GGBS $>$ 10%SF $>$ 30%PFA. Finally, It was found that 76.47% of healed crack surface calculated from the artificial crack healing technique using electrochemical deposition method.

최근 들어 균열 치유 향상도의 가속화 방안으로서 전기 화학적 전착 기법을 활용한 인공 균열 치유방법에 관한 실험연구가 수행되고 있다. 이 연구에서는 고내구성 콘크리트의 설계 및 유지관리를 위한 방안으로서 혼합콘크리트의 사용에 따른 인공 균열 치유방법상의 부식방식 모니터링의 비교 및 균열 치유향상도의 분석을 수행하였다. 이를 위해 철근콘크리트내로의 가압전류의 특성분석, 가용 전해질의 특성분석, 갈바닉 전류 모니터링, 선형분극저항측정 비교, 균열 치유 전/후의 치유향상도의 사진화상분석등을 통해 혼합 콘크리트의 인공 균열 치유기법 적용에 따른 치유 향상도를 실험적 연구로서 수행하였다. 실험결과로부터, 인공균열치유에 의한 가압전류 측면에서 20,000 min의 통전시간에 따라 점차적으로 가압전압값이 증가하면서 2.9 V로 물/시멘트비에 관계없이 수렴하고 있음을 알수 있었고, 갈바닉전류 모니터링에 따른 부식지연성은 W/C의 경우에 0.4 $>$ 0.5 $>$ 0.6의 순서로, 결합재별 비교에 있어서는 OPC $>$ 60%GGBS $>$ 10%SF $>$ 30% PFA의 순서로 나타남을 알 수 있었다. 한편 전기화학적 전착기법에 의한 치유후 기존 균열면적의 76.47%가 치유됨을 확인하였다.

Keywords

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