CORROSION RESISTANCE OF CR-BEARING REBAR IN CONCRETE DUE TO COMBINED DETERIORATION

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  • TAE Sung Ho
    Dept. of Architecture, College of Eng., Hanyang University
  • NOGUCHI Takafumi
    Dept. of Architecture, Graduate School of Eng., The University of Tokyo
  • UJIRO Takumi
    Stainless Steel Research Dept., Steel Research Laboratoy, JFE Steel Corporation

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Other Title
  • 中性化と塩害の複合劣化環境下でのコンクリート中のCr鋼鉄筋の防食性に関する研究
  • チュウセイカ ト エンガイ ノ フクゴウ レッカ カンキョウ カ デ ノ コンクリート チュウ ノ Cr コウテッキン ノ ボウショクセイ ニ カンスル ケンキュウ

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Abstract

With the aim of developing Cr-bearing rebars having required resistance to deteriorative environments prone to carbonation with or without chloride attack, ten types of steel bars having different Cr contents were embedded in concretes with chloride ion contents of 0, 0.3, 0.6, 1.2, and 2.4kg/m^3 to fabricate specimens assuming such deteriorative environments. After being carbonated to the reinforcement level, these concretes were subjected to corrosion-accelerating cycles of heating/cooling and drying/wetting. The time-related changes in the corrosion area ratio and corrosion loss of the Cr-bearing rebars were then measured to investigate their corrosion resistance. The results revealed that the Cr content required for corrosion resistance in a simple carbonating environment was 5% or more. The corrosion-resisting performance of Cr-bearing reinforcement was particularly noticeable with a Cr content of 7% or more. In a deteriorative environment prone to both carbonation and chloride attack, corrosion resistance was evident with a Cr content of 5% or more and 9% or more in concretes with chloride ion contents of 1.2 and 2.4kg/m^3, respectively.

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