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J. Korean Ceram. Soc. > Volume 44(9); 2007 > Article
Journal of the Korean Ceramic Society 2007;44(9): 517.
doi: https://doi.org/10.4191/kcers.2007.44.9.517
수화물 소성법에 의한 알루민산삼칼슘 클링커의 합성에 관한 연구
기태경, 송태웅
경남대학교 신소재공학과
Study on Synthesis of Tricalciumaluminate Clinker by Hydrate-burning Method
Tae Kyung Ki, Tae Woong Song
Department of Advanced Materials Engineering, Kyungnam University
ABSTRACT
For the preparation of tricalciumaluminate $(C_3A)$ clinker, in traditional clinkering method using oxides and carbonates as a raw material, uneconomical repetition of burning have been necessary to avoid the melting of clinker by eutectic reaction in the system $CaO-Al_2O_3$. In this study, special starting raw materials for the clinker burning were prepared from a mixture of oyster shell and aluminium hydroxide by heating to $1100^{circ}C$ and hydrating at $30^{circ}C$. The starting raw materials, hardened body with weak hydraulic strength, were mainly composed of $C_3AH_6$ formed by resolution-precipitation mechanism of the system $CaO-Al_2O_3-H_2O$. By heating them, relatively pure $C_3A$ clinker could be obtained by one-time burning at the fairly lower temperature than that of conventional method. The easier formation of $C_3A$ clinker seemed to be caused by higher compositional homogeneity and stoichiometry of the starting materials, high surface area and crystallographic instability of the thermally decomposed products, and the catalytic effect of decomposed moisture on the early-stage crystallization of calciumaluminates. The basic hydration behavior of the clinker was also confirmed.
Key words: Tricalciumaluminate, Clinker burning, Thermal decomposition, $C_3AH_6$, Special cement
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