Abstract
Early hydration reactions of portland cement-silica fume blends were followed by conduction calorimetry, Ca(OH) 2 estimation, and later reactions by Ca(OH) 2 and non-evaporable water contents. Silica fume accelerated both C 3S and C 3A hydration in the first few hours. At longer periods pastes of blends hydrated to a greater extent than mortars, possibly because sand acted as a Ca(OH) 2 sink in the mortars.
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