Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Study on Synthesis of Tricalciumaluminate Clinker by Hydrate-burning Method

수화물 소성법에 의한 알루민산삼칼슘 클링커의 합성에 관한 연구

  • Ki, Tae Kyung (Department of Advanced Materials Engineering, Kyungnam University) ;
  • Song, Tae Woong (Department of Advanced Materials Engineering, Kyungnam University)
  • 기태경 (경남대학교 신소재공학과) ;
  • 송태웅 (경남대학교 신소재공학과)
  • Published : 2007.09.30
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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.

Keywords

References

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