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J. Korean Ceram. Soc. > Volume 48(6); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(6): 584.
doi: https://doi.org/10.4191/kcers.2011.48.6.584
C3A-CaSO4·2H2O 계의 수화반응에 미치는 석회석 미분말의 영향
이종규, 추용식, 송훈
한국세라믹기술원 그린세라믹본부
Effect of Limestone Powder on Hydration of C3A-CaSO4
Jong-Kyu Lee, Yong-Sik Chu, Hun Song
Green Ceramics Division, Korea Institute of Ceramic Engineering & Technology
ABSTRACT
In this work, effects of limestone powder on hydration of $C_3A-CaSO_4{cdot}2H_2O$ system was discussed based on the XRD Quantitative analysis, and the possibility of Delayed Ettringite Formation was also discussed. The early hydration of $C_3A$ was delayed by addition of $CaCO_3$ powder. The delay effect was enhanced by increasing of $CaCO_3$ content and finer powder of $CaCO_3$ addition. After consumption of $CaSO_4{cdot}2H_2O$, the reaction of $CaCO_3$ is started. Delayed Ettringite Formation would take place because monosulfoaluminate is not stable in presence of $CaCO_3$. In order to prevent the delayed ettringite formation in $C_3A-CaSO_4{cdot}2H_2O-CaCO_3$ system, the reduction of monosulfoaluminate formation is important. Therefore, by increasing the amount of $CaCO_3$ addition and finer $CaCO_3$ powder addition, the delayed ettringite formation can be prevented.
Key words: Limestone powder, Initial hydration, Monocarboaluminate, Delayed ettringite formation
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