The Effects of the Heavy Metal Ions on the Hydration and Microstructure of the Cement Paste

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J. Korean Ceram. Soc. > Volume 30(11); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(11): 967.

중금속이온이 시멘트의 수화 및 미세구조에 미치는 영향

김창은, 이승규

연세대학교 공과대학 세라믹공학과

The Effects of the Heavy Metal Ions on the Hydration and Microstructure of the Cement Paste

ABSTRACT

The effect on the hydration of cement was that Cu and Pb reacted with alkali to form soluble hydrates at theinitial stage and then there followed a slow reaction forming insoluble metal hydroxides. These hydroxides were deposited on the surface of cement particles providing a barrier against further hydration. But as a slow reaction continued, the insoluble layers were eventually destroyed and the hydration reaction resumed. Thereafter, another retardation occured by restricting the polymerization of silicates, shown by FT-IR spectroscopy analysis. In the case of Cr, as its reaction with cement caused H2O, the coordinator of Cr complex, to replace or polymerize with OH-, the formation of Cr complex promoted the leakage of OH- and increased the heat of dissolution. So the total heat evolution during hydration was larger than that in the case of Pb or Cu. The retarding effect of heavy metal ions was in the order Pb>Cu>Cr.