STUDY ON APPLICABILITY OF WET-CARBONATED CEMENTITIOUS SLURRY AS AN ADMIXTURE FOR CONCRETE AND ITS EFFECT ON CO<sub>2</sub> REDUCTION

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  • HAYAKAWA Takayuki
    TAIHEIYO CEMENT CORPORATION（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • KUROKAWA Daisuke
    TAIHEIYO CEMENT CORPORATION（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • NANAO Mai
    TAIHEIYO CEMENT CORPORATION（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • NOGUCHI Takafumi
    THE UNIVERSITY OF TOKYO SCHOOL OF ENGINEERING BME Lab.（7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan）

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Other Title
  • 湿式炭酸化処理したセメント系スラリーのコンクリート用混和材としての適用性とCO<sub>2</sub>削減効果に関する検討

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<p>The study evaluated the applicability of cement slurries with CO2 fixed by wet carbonation as concrete dmixtures. The compressive strength of concrete mixed with carbonated slurry was equivalent to that of unmixed concrete in the range of 10 to 20wt％ replacement as solids. Furthermore, the compressive strength was higher than that of concrete mixed with the same amount of limestone fine powder or light calcium carbonate, with less bleeding and shorter setting time than that of concrete mixed with the same amount of limestone fine powder. Concrete mixed with carbonated slurry of different carbonation degree showed different strength development at different pH, and the pore structure also changed. 8pH of carbonated slurry was considered appropriate considering the CO2 reduction effect and practical aspects.The CO2 reduction effect of concrete mixed with carbonated slurry was estimated to be due to the reduction in cement equivalent to the amount of CO2 fixed in the slurry and the binding water of the reacting solids in the slurry, in addition to the CO2 fixed by the slurry. Using a formulation with 20％ replacement of solids as an example, the CO2 reduction was 39kg/m3 when the base material was cement, while the CO2 reduction was 82kg/m3 when the base material was concrete sludge, which is a waste material.</p>

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