Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Determination of Structural Capacity Based on Deformation and Bond Strength for RC Structure at Steel Corrosion

변형과 부착강도 기반 철근 부식에 의한 RC구조물의 구조적 성능 평가

  • Jung Wook Lee (Department of Civil & Environment System Engineering, Hanyang University) ;
  • Ki Yong Ann (Department of Civil & Environment Engineering, Hanyang University)
  • 이정욱 (한양대학교 건설환경시스템공학과) ;
  • 안기용 (한양대학교 건설환경공학과)
  • Received : 2023.11.07
  • Accepted : 2023.11.28
  • Published : 2023.12.30
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Abstract

In this study, the structural limit for concrete was experimentally determined against corrosion of steel. The structural limit was taken as (1) the deformation of concrete at yielding, (2) the maximum pull-out strength and (3) the pull-out strength at the level for uncorroded specimen. Corrosion of steel was accelerated by extracting charges from steel surface to govern degree of steel corrosion. As a result, an increase in the steel diameter resulted in an increase in the corrosion degree to reach the concrete deformation at yielding. Again, an increase in the steel diameter resulted in an increase in the extracted charge to meet the maximum and uncorroded-equivalent level for the bond strength. However, the mass loss was marginally affected by the steel size, reflecting that these parameters could be used to alert the structural limit.

본 연구에서는 철근의 부식에 대한 콘크리트의 구조적 한계를 실험적으로 정의하였다. 구조적 한계는 (1) 항복 시 콘크리트의 변형, (2) 최대 부착강도, (3) 부식되지 않은 시험체 수준의 부착강도로 고려하였다. 철근 표면에서 전하를 추출하는 전기화학적 방식을 이용하여 철근 부식을 촉진시켰다. 그 결과, 철근 직경이 증가할수록 부식 정도가 증가하여 콘크리트 변형은 항복상태에 도달하는 것으로 나타났다. 또한 철근 직경의 증가는 최대 부착강도와 부식되지 않은 수준의 부착강도에 도달되기 위한 전류 인가량을 증가시켰다. 그러나 질량 손실은 철근 크기에 미미하게 영향을 받았는데, 이는 구조적 성능의 매개변수(콘크리트 변형, 부착강도의 변화)를 통해 철근 부식에 의한 구조물의 사용수명을 대변할 수 있음을 의미한다.

Keywords

Acknowledgement

이 논문은 2021년 정부(과학기술정보통신부)의 재원으로 한국연구재단의 연구비 지원에 의해 수행되었습니다(No. NRF-2020 R1A2C3012248). 이에 감사드립니다.

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