콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제24권5호
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  • Pages.613-621
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  • 2012
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  • 1229-5515(pISSN)
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  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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용융아연도금 철근의 부식 특성 및 구조적 특성에 대한 연구

Study on Corrosion and Structural Performance in Hot-Dip Galvanizing Steel

  • 권성준 (한남대학교 건설시스템공학과) ;
  • 이상민 (비앤티엔지니어링(주)) ;
  • 이명훈 (한국해양대학교 해양시스템공학과) ;
  • 박상순 (상명대학교 건설시스템공학과)
  • 투고 : 2012.05.29
  • 심사 : 2012.08.01
  • 발행 : 2012.10.31
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초록

철근부식은 콘크리트의 내구성 문제뿐 아니라 구조적인 안전성에 영향을 미치므로 매우 중요한 열화이다. 철근부식을 방지하기 위하여 콘크리트 구체의 내구성을 향상시키려는 연구가 진행되고 있으나 용융아연도금 철근과 같이 철근 표면을 코팅함으로서 부식을 방지하려는 연구도 진행되고 있다. 이 연구는 용융아연도금 철근의 내부식성능 및 구조성능을 정량적으로 평가하는 것이다. 이를 위하여 아연, 알루미늄, 아연 45% + 알루미늄 55% 등을 사용한 도금 철근에 대하여 예비실험을 수행하였다. 다양한 금속코팅재료의 부식거동을 평가하여 최적의 도금재료인 아연을 선정하였으며, 아연도금 철근의 전위변화를 촉진염수 분무실험 등을 통하여 평가하였다. 또한 용융아연 도금된 철근과 일반철근을 이용하여 철근의 인장강도 시험, 콘크리트와의 부착력 시험 등이 수행되었으며, 최종적으로 RC 보를 제작하여 균열패턴 및 구조거동을 평가하였다. 이 연구에서는 다양한 금속코팅재료의 부식거동, 노치를 가진 금속의 전위변화 등을 포함한 부식특성이 평가되었다. 또한 부착력, 인장강도, 하중에 따른 거동 등을 포함한 구조적 거동이 평가되었으며, 최종적으로 용융아연도금 철근의 사용에 대한 적용성이 검토되었다.

Steel corrosion is one of the most critical deteriorations in concrete structures due to the problems associated with both durability and structural safety issues. For protection of steel against corrosion problems, researches to improve concrete durability and steel corrosion protection such as rebar coating by hot-dip galvanizing steel have been carried out. This study was performed to quantitatively evaluate anti-corrosion and structural performance of concrete structures reinforced with hot-dip galvanizing steel rebar. Preliminary tests for several metal coatings such as zinc, aluminum, and their alloy (Zn 45% + AL 55%) were performed. After evaluation of corrosive characteristics, Zn was selected for the coating material and the corrosion behaviors in Zn-coated steel were evaluated in various conditions. Furthermore, tensile and adhesive strengths were evaluated for the normal and the hot-dip galvanized steel. The crack patterns and structural behaviors of RC specimens with the normal and coated steel were investigated. Also, corrosion characteristics including corrosion in various coating metal and potential change in metal with notch were evaluated. Structural performances of tensile and adhesive strengths as well as RC beam behavior under flexural/shear loading were evaluated. The test and evaluation results showed that the applicability of hot-dip galvanized steel rebar can be used as corrosion resistant reinforcements for RC structures.

키워드

참고문헌

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피인용 문헌

  1. An Experimental Study on Flexural Behavior of Beams Reinforced with Zinc-Coated Rebar vol.26, pp.3, 2014, https://doi.org/10.4334/JKCI.2014.26.3.299