한국구조물진단유지관리공학회 논문집 (Journal of the Korea institute for structural maintenance and inspection)

  • 제18권1호
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  • Pages.93-100
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  • 2014
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  • 2234-6937(pISSN)
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  • 2287-6979(eISSN)
한국구조물진단유지관리공학회 (Korea Institute for Structural Maintenance Inspection)
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인공해수 침지조건에 따른 부식촉진시험과 염화물침투해석에 대한 연구

A Study of Accelerated Corrosion Test and Chloride Penetration Analysis with Artificial Seawater Immersion Condition

  • 박상순 (상명대학교 건설시스템공학과) ;
  • 정지원 (상명대학교 건설시스템공학과)
  • 투고 : 2013.12.15
  • 심사 : 2013.12.26
  • 발행 : 2014.01.30
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초록

해수중 환경에서 콘크리트 구조물 내에 매립된 철근은 용존산소의 부족으로 부식이 잘 발생하지 않는다. 이 때문에 해수중 환경의 부식촉진시험은 전기화학적인 방법으로 실시되어, 실제 부식 메커니즘과 맞지 않고 장기거동과의 상관성 도출도 어려운 실정이다. 본 연구에서는 해수중 환경에서의 부식촉진시험법을 정립하기 위해 온도와 염화물농도를 주된 변수로 부식촉진시험을 실시하였다. 부식의 발생 유무는 갈바닉 전위측정법과 반전지전위법을 통한 철근부식모니터링 결과로 판단하였다. 부식촉진시험 결과 온도의 영향이 가장 지배적이라고 평가되었다. 염화물량은 시험 시편의 깊이별 염화물 농도를 측정하였다. 동일한 조건으로 FEM 내구성 해석 프로그램인 DuCOM을 통해 염화물침투 해석을 실시하여 입증하였다. 또한, 인공해수 침지 조건에 따른 용존 산소량은 실험을 통해 구했으며 이를 통해 부식촉진시험 결과의 타당성을 검증하였다.

Steel reinforcement buried in concrete structure in submerged zone does not easily become corroded due to lack of dissolved oxygen. For that reason, accelerated corrosion test in submerged state is performed with an electrochemical method, which is not suitable for actual corrosion mechanism and makes it difficult to find relevance with long-term behavior. In this study, accelerated corrosion test was performed with the temperature and chloride concentration as main variables in order to establish a method for accelerated corrosion test in submerged zone. Corrosion was determined by the result of reinforcement corrosion monitoring based on galvanic potential measurement and half-cell potential method. The accelerated corrosion test result showed that temperature had the most dominant influence. To determine the chloride content, chloride concentration by depth in the test sample was measured. With the same conditions, chloride penetration interpretation was performed by DuCOM, a FEM durability interpretation program. Also, a test was performed to measure dissolved oxygen according to soaking conditions of artificial seawater, which was used for verifying the validity of the accelerated corrosion test result.

키워드

참고문헌

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피인용 문헌

  1. Analytical Study on Structural Behavior of Surface Damaged Concrete Member by Calcium Leaching Degradation vol.18, pp.4, 2014, https://doi.org/10.11112/jksmi.2014.18.4.022
  2. A Study on the Temporal Correlation of Long-term Exposure Test and Accelerated Corrosion Test of Rebar vol.2, pp.4, 2014, https://doi.org/10.14190/JRCR.2014.2.4.307
  3. Study on the durability of MOCRC under constant-current-accelerated corrosion vol.9, pp.3, 2014, https://doi.org/10.1680/jemmr.19.00155