Effects of Portland Cement Characters and Working Temperature on the Physical Properties of Cement Mortars

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J. Korean Ceram. Soc. > Volume 37(5); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(5): 410.

시멘트의 특성과 사용 온도가 모르터의 물성에 미치는 영향

김원기, 김창은¹

동양중앙연구소 건설재료연구실
¹연세대학교 세라믹공학과

Effects of Portland Cement Characters and Working Temperature on the Physical Properties of Cement Mortars

ABSTRACT

In this study the effects of specifics surface area of cement, addition amount of gypsum and substitution ratio of gypsum anhydrite ont he physical properties of cement mortars were investigated by measruements of setting time, flow, compressive strength and hydration heat evolution rate. The results showed that fluidity of mortars was increased by 40 wt.% of maximum flow change with the decreasing specific surface area of cement from 3,500$textrm{cm}^2$/g to 3,300${pm}$50$textrm{cm}^2$/g and affected by the relationship between the cement and balancing between the chemical activityof cement and solubility of calcium sulfate are desirable to prevent the fluidity of concrete from decreasing by high temperature in summer season.

Key words: Fluidity of concrete under high temperature, Activity of cement, Sulfate ability