STUDY ON DURABILITY OF CALCIUM ALUMINATE CEMENT CONCRETE AT THE AGE OF 50 YEARS

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  • SHIMAZAKI Daiki
    DENKA Co., Ltd., Omi plant, Cement & Special Cement Additives Research Dept.（2209, Omi, Itoigawa-shi, Niigata 949-0393, Japan）
  • MORI Taiichiro
    DENKA Co., Ltd., Omi plant, Cement & Special Cement Additives Research Dept.（2209, Omi, Itoigawa-shi, Niigata 949-0393, Japan）
  • SASAGAWA Yukio
    DENKA Co., Ltd., Production & Process Technology Dept.（2-1-1, Nihonbashi-Muromachi Chuo-ku, Tokyo 103-8338, Japan）
  • SAKAI Etsuo
    TOKYO INSTIYUTE OF TECHNOLOGY, School of Materials and Chemical Technology（2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan）

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Other Title
  • 50年経過したアルミナセメントコンクリートの耐久性

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<p>Calcium aluminate cement based on calcium aluminate is superior in early strength, fire resistance and chemical resistance compared to Portland cement. On the other hand, it has been pointed out that the conversion of hydrated products decreases the strength of concrete associated with the curing temperature. This study aims at examining into durability of Calcium aluminate cement concrete by drilled core specimens at 50 years in various placing conditions to see characteristics in terms of compressive strength, tensile strength Poisson’s ratio, depth of carbonation, and hydration state related. The Calcium aluminate cement concrete without fly ash shows lower compressive strength development in course of time and decreases strength drastically when it is placed in winter. On the other hand, it is proved that the Calcium aluminate cement concrete added fly ash highly develops strength and retains durability. It is considered that by mixing the fly ash, stable strutringite was generated, and the conversion was suppressed.</p>

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