Properties of Modified Belite Cement with the Content of Clinker Minerals

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J. Korean Ceram. Soc. > Volume 35(5); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(5): 479.

클링커 광물 함량 변화시 Modified belite Cement의 특성

최연묵, 이양수¹, 김남호¹, 최상홀

한양대학교 세라믹공정연구센터
¹동양중앙연구소

Properties of Modified Belite Cement with the Content of Clinker Minerals

ABSTRACT

Raw mateials such as limestone quartzite bauxite and anhydrite were used in the production of mod-ified beloite cement. Two kinds of clinker were synthesized with relatively higher content of $C_2S$ than that of $C_4A_3{={S}}$ Concerning $C_2S$ the main mineral component borax ($Na_2O;2B_2O_3;10H_2O$) was added to stimu-late hydraulic reactivity and this would be possible by stabilizing ${alpha}'-C_2S$ at room temperature. We had in-tended to compare burning and hydraulic characteristics of clinkers with one another by varying the amount of borax addition and to study the appropriate amount of anhydrite addition needed in the strengthening of cement during hydration. It was concluded that the effective amount of borax addition ne-eded for stabilization of ${alpha}'-C_2S$ was 5 wt% in 60wt% $C_2S$ inclusive clinker and adding anhydrite in the ra-tio of 1.3 of $SO_3/Al_3O_3$ was appropriate in the production of cement by this clinker. Only ettringite was seen to contribute to the strength without additives but C-S-H was found to form along with ettringite with the addition of borax in the initial stage of hydration.

Key words: Modified belite cement, ${\alpha}시-C_2S$, $C_4A_3S$, Borax, Anhydrite, Ettringite, C-S-H