The Thermal Transformation of Tobermorite-Studies on The Thermal Transformation of Calcium Silicate Hydrates(II)-

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J. Korean Ceram. Soc. > Volume 11(4); 1974 > Article

Journal of the Korean Ceramic Society 1974;11(4): 25.

Tobermorite의 가열변화 -규산칼슘 수화물의 가열성상에 관한 연구(II)-

이종근, 최상흘, 한상목

한양대학교 요업공학과

The Thermal Transformation of Tobermorite-Studies on The Thermal Transformation of Calcium Silicate Hydrates(II)-

ABSTRACT

The mixture of quartz powder and slaked lime with plenty water was oscillated in an autoclave and treated hydrothermally under the pressure of 10 kg/$textrm{cm}^2$ for 8 hours. The main mineral synthesized was confirmed 11$AA$ tobermorite by the method of X-ray diffraction and selected area electron diffraction. Tobermorite was heat-treated at 40$0^{circ}C$, 80$0^{circ}C$ and 100$0^{circ}C$ for investigation of transformation of morphology and structure. Electron micrographs showed the thin platy structure of synthetic tobermorite with a little of crumpled foil or fibrous semi-crystalline calcium silicate hydrates. No difference in structure was appeared under the temperature of 80$0^{circ}C$ but tobermorite converted gradually into wollastonite at 800$^{circ}$~85$0^{circ}C$. On heating, moulded material from tobermorite hardly shrinks under 80$0^{circ}C$.