CO<sub>2</sub> ABSORPTION AND PRODUCTS IN CARBONATED PORTLAND CEMENTS

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  • UMETSU Mamiko
    TOKYO INSTITUTE OF TECHNOLOGY, School of Materials and Chemical Technology（2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan）
  • KUROKAWA Daisuke
    TAIHEIYO CEMENT CORPORATION, Central Research Laboratory（2-4-2, Osakau, Sakura-shi, Chiba 285-8665, Japan）
  • MORI Taiichiro
    DENKA CO., LTD., Cement & Special Cement Additives Research Dept. Omi Plant（2209 Oaza Omi, Itoigawa-shi, Niigata 949-0393, Japan）
  • SAKAI Etsuo
    TOKYO INSTITUTE OF TECHNOLOGY, School of Materials and Chemical Technology（2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan）

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  • セメント硬化体のCO<sub>2</sub>吸収と生成物の変化

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<p>This paper discusses CO2 absorption and carbonation of hardened normal （N）, moderate （MPC） and low heat Portland （LHC） cements. Calcite, vaterite and gel phase are produced in carbonated all cements. Si rich gel phase is produced in carbonated samples and Ca/Si of carbonated products analyzed by SEM-EDS is varied. Ettringite （AFt） is decomposed in all carbonated cements, but AFt is reproduced by reaction of gel phase and SO3 in carbonated MPC and LHC containing rich rate of SO3/Al2O3 compared with N. The reaction of belite is accelerated but the reaction rate of alite is not changed in carbonated samples. Total CO2 absorption measured by total carbon analyzer （TC） is larger than that of measured by thermal gravity （TG）. This is related to calcium carbonate. Absorption of CO2 in hardened cements is range of 25 to 30mass％ measured by TC. Temperature of weight loss of TG is determined by DTG. About 10-20％ of CO2 is fixed as compounds other than calcium carbonate.</p>

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