CHLORIDE ION PENETRATION BEHAVIOR OF CONCRETE WITH COMBINED CHLORIDE ION IMMOBIRIZED MATERIAL AND EXPANSSIVE ADDITIVE

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  • ITO Shinya
    DENKA CO. LTD., Omi Plant, Cement & Special Cement Additives Research Dept.（2209, Omi, Itoigawa-shi, Niigata 949-0393, Japan）
  • HORI Akihiro
    DENKA CO. LTD., Omi Plant, Cement & Special Cement Additives Research Dept.（2209, Omi, Itoigawa-shi, Niigata 949-0393, Japan）
  • NAKAMURA Junya
    SHIBAURA INSTITUTE OF TECHNOLOGY, Graduate school of Engineering and Science, Division of Architecture and Civil Engineering（3-7-5, Toyosu, Koto-ku, Tokyo 135-8548, Japan）
  • IYODA Takeshi
    SHIBAURA INSTITUTE OF TECHNOLOGY, Dept. of Civil Engineering（3-7-5, Toyosu, Koto-ku, Tokyo 135-8548, Japan）

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Other Title
  • 塩素固定化混和材と膨張材を混和したコンクリートの塩分浸透挙動

Abstract

<p>Physical properties and salt penetration behavior of concrete with chlorine immobilization material and expansive additive added were verified. It was confirmed that concrete to which chlorine immobilization material and expansive additive were added had no influence on mechanical properties compared with the case of no mixing. And when used in combination with an expansive additive, the expansion strain was introduced and it was confirmed that there was no effect on salt resistance if the expansion strain is within the proper range. As the penetration behavior of chloride ions, it was confirmed that penetration of chloride ions was suppressed by the addition of a chlorine immobilizing material in the immersion method similar to the natural state, but the penetration behavior was excessive in the accelerated test using electricity as a driving force. When converting from the effective diffusion coefficient by electrophoresis to the apparent diffusion coefficient, the necessity of newly setting the conversion coefficient was indicated in the material for chemically immobilizing ions such as the chlorine immobilizing material. In this paper, the relationship between the diffusion coefficient obtained by the apparent diffusion coefficient and electrophoresis in concrete using chlorine-immobilized material and expansive additive were examined, and shows the difference in the conversion coefficient as an example.</p>

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