Improvement of Early Strength of Blast-Furnace Slag Blended Cement at Low Temperature

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J. Korean Ceram. Soc. > Volume 36(2); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(2): 130.

고로 슬래그 시멘트의 저온 조기 강도 증진

장복기, 임용무¹, 김윤주²

전남대학교 세라믹공학과
¹전남대학교 세라믹학과
²동신대학교 세라믹공학과

Improvement of Early Strength of Blast-Furnace Slag Blended Cement at Low Temperature

ABSTRACT

The enhanced slag fineness and the batch water of low water-to-cement ratio(W/C) were employed in order to improve the early strength of blast-furnace slag blended cement at low temperature. A grinding aid was used to grind the blast-furnace slag into the fineness of 6,280$textrm{cm}^2$/g (Blaine), and this fine slag was then homogeneously mixed with the ordinary Portland cement to produce the blast-furnace slag blended cement containing 40% slag by weight composition. On the other hand, the batch water could be reduced from W/C=0.50 (KS L 5105) to W/C=0.33 through a commercial, naphthalene type superplasticizer. Through the method mentioned above, the early strength of the blast-furnace slag blended cement at low temperature could be enhanced even somewhat higher than the Portland cement strength. And the microsturcture of the cement was studied by both the pore structure analysis and the A.C. impedance measurement.

Key words: Blast furnace slag cement, Low curing temperature, Early-high strength, Pore structure analysis, A.C. impedance spectroscopy