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http://dx.doi.org/10.4191/kcers.2011.48.6.584

Effect of Limestone Powder on Hydration of C3A-CaSO4·2H2O System  

Lee, Jong-Kyu (Green Ceramics Division, Korea Institute of Ceramic Engineering & Technology)
Chu, Yong-Sik (Green Ceramics Division, Korea Institute of Ceramic Engineering & Technology)
Song, Hun (Green Ceramics Division, Korea Institute of Ceramic Engineering & Technology)
Publication Information
Journal of the Korean Ceramic Society / v.48, no.6, 2011 , pp. 584-588 More about this Journal
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.
Keywords
Limestone powder; Initial hydration; Monocarboaluminate; Delayed ettringite formation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 0
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