Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Corrosion-bond Strength Evaluation in OPC and Slag Concrete using Accelerated Corrosion Test

촉진부식실험을 이용한 OPC 및 슬래그 콘크리트의 부식-부착강도 평가

  • Sang-Jin Oh (Department of Civil Engineering, Hannam University) ;
  • Hyeon-Woo Lee (Department of Civil Engineering, Hannam University) ;
  • Seung-Jun Kwon (Department of Civil Engineering, Hannam University)
  • 오상진 (한남대학교 건설시스템공학과) ;
  • 이현우 (한남대학교 건설시스템공학과) ;
  • 권성준 (한남대학교 건설시스템공학과)
  • Received : 2023.09.18
  • Accepted : 2023.12.13
  • Published : 2024.03.30
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Abstract

Concrete, as a porous construction material, permits chloride penetration from outside, which yields corrosion in embedded steel. In the study, an accelerated corrosion technique (ICM: Impressed current method) was adopted for rapid corrosion formation with 10 Volt of potential, and corrosion amou nt was controlled u p to 10.0 %. Corrosion amou nt had a linear relationship with cumulative corrosion current and increased with a quadratic function of accelerating period due to cracking. Regarding bond strength test, OPC concrete showed rapid drop of bond strength over 3.0 % of corrosion weight ratio, however slag concrete with 30 % replacement ratio showed a level of 51.4~71.6 % of corrosion ratio to OPC concrete with keeping residual bond strength.

다공성인 콘크리트에서는 외부의 수분 및 염화물 유입이 발생하며, 이는 매립된 철근의 부식을 야기한다. 본 연구에서는 촉진부식실험(ICM: Impressed Current Method)를 이용하여 10 V의 전압을 인가하였으며, 이에 따라 10 % 수준까지 부식량을 조절하였다. 부식량은 부식전류량 누계와 선형적인 관계가 도출되었으며, 균열의 영향으로 부식 유도 시간에 따라 2차 함수의 형태로 증가하였다. 부착응력에 대해서는 OPC 콘크리트에 대해서는 부식량 3.0 % 이후 급격한 부착응력의 감소가 발생하였다. 또한 치환률 30 %의 슬래그 콘크리트에서는 일반 콘크리트에 비하여 51.4~71.6 %의 낮은 부식량을 나타내었으며 5일간의 촉진실험에도 일정 수준의 부착강도를 유지하였다.

Keywords

Acknowledgement

본 연구는 (No. NRF-2020R1A2C2009462)의 지원으로 수행되었으며 저자는 이에 감사드립니다.

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