MORPHOLOGY OF CARBONATED CEMENT SLURRY SOLIDS AND ITS EFFECT ON THE FLOWABILITY OF CEMENT COMPOSITIONS

DOI Web Site 3 References
  • 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）
  • TABA Hiromichi
    TAIHEIYO CEMENT CORPORATION（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • NOGUCHI Takafumi
    TOKYO UNIVERSITY（7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan）

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Other Title
  • 異なる条件下で炭酸化したセメントスラリー固形物の形態および固形物を混合したセメント組成物の流動性に関する考察

Abstract

<p>We evaluated the differences in the morphology of the solids obtained by carbonating cement slurries under different manufacturing conditions. The results showed that cement slurries aerated with CO2 at 10℃, 20℃, and 30℃ had different particle morphologies of solids. At 20℃ and 30℃ the carbonated slurry solids had rhombohedral calcite precipitates covering the cement clinker particles, while the clinker particles remained as silica gel. On the other hand, in the carbonate slurry solids produced at 10℃, no precipitation of calcite covering clinker particles was observed but fine cubic calcite was dispersed independently of clinker particles, and the clinker particles showed differences in reaction progress depending on the clinker mineral type. In particular, Alite was observed to react and calcium was dissolved out and present as a C-S-H gel, while Belite and interstitial phases were observed to be in a relatively unreacted state. In the slurry prepared without CO2 aeration, no calcium carbonate precipitation was observed, and many unreacted clinker particles and calcium hydroxide particles were observed. The flowability of cement pastes and mortars with 15％ or 20％ substitution of carbonated slurry solids produced at various temperatures for the cement mass was found to be better when mixed with solids produced at 10℃ than when substituted with solids produced at 20℃ and 30℃.</p>

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