Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Corrosion Characteristics of Steel Reinforcements Induced by Internal Chlorides in Concrete and Determination of Chloride Thresholds

콘크리트 내부염소이온에 의한 철근의 부식특성 및 임계 염소이온농도의 결정 연구

  • 오병환 (서울대학교 토목공학과) ;
  • 장승엽 (서울대학교 토목공학과) ;
  • 신용석 (서울대학교 토목공학과 연구원)
  • Published : 1999.06.01
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Abstract

The corrosion of steel reinforcements in concrete is of great concern in recent years. This study is focused on the corrosion behavior of steel bars induced by internal chlorides in concrete at early ages. The main objective of this study is to determine the chloride thresholds causing depassivation and active corrosion of steel reinforcement in concrete. To examine the threshold concentration of chloride ion, the half-cell potential, chemical composition of expressed pore solutions of concrete and the rate of corosion area of the specimens were measured. Major variables include the added amount of chlorides in concrete, types of binders, and water-to-binder ration. From the present comprehensive experimental results, the factors influencing chloride-induced corrosion are investigated, and the chloride thresholds causing active corrosion of steel bars are proposed. The present study will enable to specify the realistic chloride limit in concrete which can be used in the future technical specification.

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References

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