CORROSION RATE OF REBAR IN MORTAR WITH COMBINED DETERIORATION DUE TO CHLORIDE ATTACK AND ASR

DOI Web Site 4 References
  • SUGAWARA Norihiro
    Former KANAZAWA INSTITUTE OF TECHNOLOGY, Graduate School Master Degree（3-1, Yatsukaho, Hakusan-shi, Ishikawa 924-0833, Japan）NIPPON KOEI Co., LTD., Road Division Transportation Operations, Road Infrastructure Management Dept（5-4, Koji-machi Chiyoda-ku, Tokyo 102-8539, Japan）
  • MIYAZATO Shinichi
    KANAZAWA INSTITUTE OF TECHNOLOGY, Faculty of Engineering（3-1, Yatsukaho, Hakusan-shi, Ishikawa 924-0833, Japan）
  • SAITO Tsuyoshi
    NIIGATA UNIVERSITY, Faculty of Engineering（8050, Ikarashi Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan）
  • SUZUKI Kazuho
    Former NIIGATA UNIVERSITY, Graduate School of Science and Technology（8050, Ikarashi Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan）MITSUBISHI UBE CEMENT CORPORATION, Research & Development Center（1-6, Okinoyama, Kogushi, Ube-shi, Yamaguchi 755-8633, Japan）

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Other Title
  • 塩害とASRの複合劣化が生じたコンクリート中鉄筋の腐食速度の評価とFAを用いた抑制策の提案

Abstract

<p>In chloride attack, the passivation film of the rebar is destroyed and the corrosion progresses. In alkali silica reaction （ASR）, the aggregate expands and cracks occur. This study evaluated the corrosion rate of the rebars in concrete with chloride ion and glass cullet, targeting the combined deterioration due to both chloride attack and ASR. That is, when the concrete was mixed, water containing sodium chloride aqueous solution was partially used. In addition, the glass cullet having reactivity was partially mixed with the land stone as a coarse aggregate. Based on these procedures, specimens were deteriorated with independent chloride attack, combined deterioration and Fly ash admixture with chloride attack or combined deterioration. The crack on the concrete was observed and the corrosion rate of the rebar was measured. In addition, the porosity was investigated from porosity test, the amount of oxygen supply was investigated from the cathodic polarization curve, and the formation of an electric circuit was investigated from the concrete resistivity. These were evaluated comprehensively, and the influence of ASR on the corrosion rate was considered. As a result, it was clarified that ASR gel inhibits oxygen supply and suppresses the corrosion rate, and that the addition of FA makes the concrete structure denser and suppresses the corrosion rate.</p>

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