FUNDAMENTAL STUDY ON CARBONATION PROGRESS WITH TYPE C BLAST FURNACE SLAG CEMENT DUE TO SHRINKAGE REDUCING

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  • SUDA Yuya
    UNIVERSITY OF THE RYUKYUS, Faculty of Engineering（1, Senbaru, Nishihara-cho, Okinawa 903-0213, Japan）
  • ISHISOKO Kentaro
    NAHA CITY, Road Construction Division（1-1-1, Izumizaki, Naha-shi, Okinawa 900-8585, Japan）
  • TOMIYAMA Jun
    UNIVERSITY OF THE RYUKYUS, Faculty of Engineering（1, Senbaru, Nishihara-cho, Okinawa 903-0213, Japan）

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Other Title
  • 収縮低減による高炉セメントC種の中性化抑制効果に関する基礎的検討

Abstract

<p>In this study, the effect of a shrinkage-reducing agent and reactive MgO on the carbonation progress of type C Blast furnace slag cement was assessed under acceleration conditions （5％ of CO2 concentration）, and the microstructure of carbonated slag cement paste was investigated. Replacing reactive MgO in cement reduced the carbonation depth and shrinkage in the slag-cement paste. The oxygen diffusion coefficient of carbonated slag-cement paste was larger than before carbonation. In contrast, the diffusion coefficients of carbonated slag cement paste with reactive MgO were lower than the OPC cement paste. In carbonated slag cement paste with reactive MgO, aragonite and hydrotalcite were formed as carbonate minerals. It was indicated that the formation of hydrotalcite leads to decreasing the decomposition of calcium silicate hydrate and portlandite during the carbonation process. In addition, coarsening of the pore structure was not observed due to the restrained microstructural change by the decomposition of calcium silicate hydrate for slag cement paste with reactive MgO.</p>

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