HIGH TEMPERATURE CARBONATION OF LIME IN EXPANSIVE ADDITIVES FOR CONCRETE

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  • HIGUCHI Takayuki
    DENKA CO., LTD.（2209, Omi, Itoigawa-shi, Niigata 949-0393, Japan）
  • MORIOKA Minoru
    DENKA CO., LTD.（2209, Omi, Itoigawa-shi, Niigata 949-0393, Japan）
  • AIKAWA Yutaka
    TOKYO INSTITUTE OF TECHNOLOGY（2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan）
  • SAKAI Etsuo
    TOKYO INSTITUTE OF TECHNOLOGY（2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan）

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  • コンクリート用膨張材に含まれる遊離石灰の高温炭酸化反応

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<p>High-temperature carbonation of the lime in expansive additive（CSA）and the lime synthesized itself were evaluated. The CO2 in the lime synthesized itself increased continuously according to the treatment time. On the other hand, the increment of CO2 in CSA was almost finished in initial stage. The lime in CSA consisted of mono crystal, coated by CaSO4 didn’t carbonate. Therefore the generation of calcite of CSA was limited in the stripped lime on the surface, the excessive carbonation of the inside of the lime was controlled. An equation developed by Tomozawa was applied to model the carbonation of lime in the CSA, and the theoretical and experimental values were found to reflect similar behavior. This model was used to obtain the optimum treatment conditions to improve the weathering resistance and expansive performance based on the exhaust gas, temperature, and CO2 pressure.</p>

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