CO<sub>2</sub> SEQUESTRATION BY ACCELERATED CARBONATION PROCESS OF RECYCLED CONCRETE AGGREGATES USING CO<sub>2</sub> SEPARATED AND CAPTURED FROM CEMENT PLANT

DOI Web Site 2 References
  • NANAO Mai
    TAIHEIYO CEMENT CORPORATION（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • NOZAKI Takahito
    TAIHEIYO CEMENT CORPORATION（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • WANG Dianchao
    TONGJI UNIVERSITY（No.1239, Siping Road, Shanghai, P. R. China）
  • NOGUCHI Takafumi
    TOKYO UNIVERSITY（7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan）

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Other Title
  • セメントキルン排ガス分離回収CO<sub>2</sub>を用いた加熱炭酸化処理による廃コンクリートへのCO<sub>2</sub>固定化

Abstract

<p>This study examined the effectiveness of accelerated carbonation using an externally heated rotary kiln for efficient CO2 uptake in recycled concrete aggregates. As a result, accelerated carbonation treatment was shown to be effective in promoting CO2 uptake of recycled concrete aggregates. Also, scale-up tests showed that operation at 500kg/h scale was stable, indicating the feasibility of process construction. Moreover, the amount of hexavalent chromium elution did not increase with accelerated carbonation, indicating that environmental safety is not a problem. It was confirmed that the modified CBR satisfied the quality standard for upper layer roadbed material and the high temperature （120℃） carbonated recycled concrete aggregates had sufficient performance as a roadbed material. These results indicate that recycled concrete aggregates treated by accelerated carbonation can be recycled as roadbed material.</p>

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