Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Quantification of Half Cell Potential with Mix Properties in RC Member under Long-Term Chloride Exposure Conditions

장기 염해에 노출된 RC 부재의 배합 특성을 고려한 반 전위의 정량화

  • Yoon, Yong-Sik (Department of Civil and Environmental Engineering, Hannam University) ;
  • Jeong, Gi-Chan (Structure Business Department, Dong Myeong Engineering Consultants & Architecture) ;
  • Kwon, Seung-Jun (Department of Civil and Environmental Engineering, Hannam University)
  • 윤용식 (한남대학교 토목환경공학과) ;
  • 정기찬 (동명기술공단 구조사업부) ;
  • 권성준 (한남대학교 토목환경공학과)
  • Received : 2022.09.13
  • Accepted : 2022.09.26
  • Published : 2022.09.30
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Abstract

In this study, the correlation between Half Cell Potential(HCP) and the corrosion influencing factors was analyzed with considering three levels of water-cement ratio, the concentration of chloride solution, and cover depth. As a result of long-term corrosion monitoring, HCP behavior was close to the critical corrosion potential(-350 mV) in all water-cement ratios in the case of 3.5 % and 7.0 % chloride concentration. Regarding the passed charge test in 548 curing days, the passed charge results were improved to 'Moderate' grade. Multiple regression analysis was performed to evaluate the correlation between corrosion influencing factors and HCP, and it was evaluated that the effects of influencing factors to HCP were in the order of chloride concentration, water-cement ratio, and cover depth. In the case of the relationship between HCP and the passed charge, the coefficient of determination showed a high level of 0.9, which yielded a close correlation between the passed charge and HCP.

본 연구에서는 3가지 수준의 물-시멘트 비, 상부 염수 농도, 피복 두께를 고려하여 반 전위와 영향인자들 간의 상관성을 분석하였다. 장기 부식 모니터링 결과 염수 농도 3.5, 7 %에서 초기에 모든 물-시멘트 비에서 임계부식전위(-350mV)에 근접하는 거동을 보였다. 통과 전하량 시험 결과 548일에서 모든 배합에서 'Moderate' 등급으로 개선된 통과 전하량이 평가되었다. 부식 영향인자와 반 전위 값 간의 상관성을 평가 하고자 다중 회귀분석을 수행하였는데, 염수 농도, 물-시멘트 비, 피복 두께 순으로 영향을 준 것으로 평가되었다. 반 전위와 통과 전하량간의 상관성 분석 결과는 0.9로 높은 수준의 결정계수를 보였으며, 통과 전하량과 반 전위 값 간에는 밀접한 상관성이 존재하는 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 정부의 지원으로 한국연구재단 중견연구자지원사업의 지원을 받아 수행되었으며 이에 감사드립니다(NRF-2020R1A2C2009462).

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