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J. Korean Ceram. Soc. > Volume 44(11); 2007 > Article
Journal of the Korean Ceramic Society 2007;44(11): 633.
doi: https://doi.org/10.4191/kcers.2007.44.1.633
알칼리 활성화 슬래그 시멘트 모르타르의 내황산성
민경산, 이승헌
군산대학교 신소재공학
Resistance of Alkali Activated Slag Cement Mortar to Sulfuric Acid Attack
Kyung-San Min, Seung-Heun Lee
Department of Material Science & Engineering, Kunsan National University
ABSTRACT
The setting time of alkali activated slag cement tends to be much faster than ordinary Portland cement, and its compressive strength had been higher from the 1 day but became lower than that of the cement on the 28 days. According to the results of the surface observation, weight loss, compressed strength, and erosion depth tests on the sulphuric acid solution. It has been drawn that alkali activated slag cement has a higher sulphate resistance than ordinary Portland cement, and in particular, the alkali activated slag cement added 5 wt% alumina cement has little deterioration on the sulphuric acid solution. The reason why the alkali activated slag cement has higher sulphate resistance than other hardened cement pastes is that it has no $Ca(OH)_2$ reactive to sulphate ion, and there is little $CaSO_4{cdot}2H_2O$ production causing volume expansion, unlike other pastes. And it is supposed that $Al(OH)_3$ hydrates with high sulphate resistance, which is produced by adding the alumina cement increases the sulfate resistance.
Key words: Alkali activated slag cement, Sulphate resistance, Alumina cement, Cement
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