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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Evaluation of Anti-Corrosion Performance of FRP Hybrid Bar with Notch in GGBFS Concrete

GGBFS 콘크리트에 매립된 Notch를 가진 FRP Hybrid Bar의 부식저항성 평가

  • 오경석 (한남대학교 건설시스템 공학과) ;
  • 박기태 (한국건설기술연구원) ;
  • 권성준 (한남대학교 건설시스템 공학과)
  • Received : 2016.02.25
  • Accepted : 2016.03.09
  • Published : 2016.07.01
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Abstract

Concrete structure is a construction material with durability and cost-benefit, however the corrosion in embedded steel causes a critical problem in structural safety. This paper presents an evaluation of chloride resistance and pull-off performance with various corrosion level. For the work, OPC(Ordinary Portland Cement) concrete and GGBFS(Ground Granulated Blast Furnace Slag) concrete are prepared with normal steel. Artificially notch induced FRP Hybrid Bar is also prepared and embedded in OPC concrete and accelerated corrosion test is performed. Through the test, FRP Hybrid Bar with notch is evaluated to have insignificant effect on pull-off capacity when corroded steel shows only 21% level of pull-off capacity. Furthermore GGBFS concrete with normal steel shows over 70% level of pull-off capacity due to reduced corrosion currency.

콘크리트 구조물은 내구성과 경제성이 확보된 건설재료이지만, 매립된 철근의 부식은 내구적인 문제뿐 아니라 구조물의 안전성에 큰 영향을 준다. 본 연구는 유리섬유와 강재를 에폭시로 일체화 시킨 FRP Hybrid Bar를 적용한 콘크리트에 대해 염해 침투 저항성과 부식수준에 따른 부착성능을 평가하였다. 이를 위해 일반 강재를 적용한 OPC(Ordinary Portland Cement)시편과 GGBFS를 30% 혼입한 시편에 대하여 부식을 0~10% 촉진하여 부착력을 평가하였다. 또한 FRP Hybrid Bar는 에폭시 코팅으로 인해 보통 상태에서는 부식 진전이 매우 작으므로 notch를 인위적으로 가하여 OPC 콘크리트에 매립시켰으며, 이후 부식실험을 수행하였다. 실험 결과, 부식된 철근의 부착력이 21% 수준으로 감소해도 FRP Hybrid Bar에 발생된 notch는 부착력에 큰 영향이 없는 것으로 평가되었다. 또한 GGBFS 콘크리트를 사용한 부재의 경우, 통과 전류가 감소하여 일반철근을 사용해도 70%이상의 부착력을 유지하고 있었다.

Keywords

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