Synthesis of <TEX>$CA_2$</TEX>-based Clinker by Hydration-Burning Method (I) : Effects of Temperature on Synthesis

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J. Korean Ceram. Soc. > Volume 27(2); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(2): 211.

수화-소성법에 의한 $CA_2$클린커의 합성(I) : 합성에 미치는 온도의 영향

송태웅, 한기성¹

경남대학교 무기재료공학과
¹인하대학교 무기재료공학과

Synthesis of $CA_2$-based Clinker by Hydration-Burning Method (I) : Effects of Temperature on Synthesis

ABSTRACT

CA2-based clinker with highly activated surface and hydraulic properties was synthesized at a comparatively lowr temperature than that of conventional synthesis by "hydration-burning method". This consists of calcining the mixture of CaCO3 and Al2O3 to obtain a primary clinker, hydrating the primary clinker and reburning the hydrates to obtain final clinker. Burning of primary clinker above 1200℃ was necessary to eliminate free CaO in it and to obtain it's solid hydrate. However, rising the burning temperature above 1300℃ is ineffective due to the decrease in hydraulic properties of the primary clinker with the temperature. Hydration of primary clinker at the elevated temperature(>35℃) was required to obtain the hydrate with more porous structure and final clinker with more active surface. CA2 was formed and increased with temperature at above 1150℃, finally became a primary phase of the final clinker. However, burning at the temperature above 1300℃ resulted in reverse effect on the hydraulic properties of the final clinker due to rapid decrease in it's surface area with the temperature.