Effect of Sodium Tripolyphosphate and Silica Fume on Hydration of High Alumina Cement

Abstract

It was found that silica fume can reduce the maximum hydration heat release rate of cement by microcalorimetry, inhibit CAH₁₀, promote the generation of C₃AH₆ and strätlingite C₂ASH₈, or promote the conversion of CAH₁₀ to C₃AH₆. Sodium tripolyphosphate can retard the early hydration of cement, have a slight effect on 1 d hydration products of cement and inhibit the generation hydration products. Sodium tripolyphosphate and silica fume can promote the early hydration of cement, advance the formation of C₂ASH₈ or the conversion from CAH₁₀ to C₃AH₆ at 1 d.

Keywords

high aluminum cement / silica fume / dispersing agent / hydration

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