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J. Korean Ceram. Soc. > Volume 40(9); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(9): 859.
doi: https://doi.org/10.4191/kcers.2003.40.9.859
3CaO.3A12O3.CaSO4.CaSO4.2H2O - Ca(OH)24 - 3CaO.Al2O3계의 수화 특성
배승훈, 송종택
단국대학교 신소재공학과
Hydration Properties of 3CaO.3A12O3.CaSO4.CaSO4ㆍ2H2O - Ca(OH)24 - 3CaO.Al2O3 System
ABSTRACT
When calcium sulfoaluminate-based expansive cement was hydrated, ettringite and monosulfate were mainly formed. The crack of hardened cement was prevented by compensating drying shrinkage due to formation of the above hydrates. In order to study the hydration properties of calcium sulfoaluminate-based expanding cement, 3CaOㆍ3Al$_2$O$_3$ㆍCaSO$_4$(C$_4$A$_3$S) was prepared by chemical synthesis, and then the hydration of $C_4$A$_3$S-Ca(OH)$_2$-CaSO$_4$.$2H_2O$-C$_3$A system_was characterized. Good $C_4$A$_3$S phase was prepared at $1300^{circ}C$ by chemical synthesis, and the main hydration product of $C_4$A$_3$S-Ca(OH)$_2$-CaSO$_4$.2$H_2O$ system was ettringite. In the case of hydration $C_4$A$_3$S-Ca(OH)$_2$-CaSO$_4$ㆍ 2$H_2O$-C$_3$A system, ettringite was formed in the early period and it was transformed into monosulfate while consumed gypsum.
Key words: Calcium sulfoaluminate, Chemical synthesis, Hydration, Ettringite, Monosulfate
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