Abstract
The aim of this paper is to develop a better understanding of the isolated contribution of silica fume on concrete and determine its optimum content. There is much debate among researchers as to the mode of action of silica fume on the mechanism of strength development and its optimum replacement percentage. Extensive experimentation was conducted over water-binder ratios ranging from 0.26-0.42 and silica fume-binder ratios from 0.0-0.3. Results indicate that the optimum replacement percentage for 28-day strength is not a constant one, but depends on the water-cementitious material ratio of the mixture and has been found to range from 15-25%. On quantifying the pozzolanic and physical effects of silica fume, it is observed that both mechanisms significantly contribute to the concrete strength.
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