Effect of silica fume on pore structure and chloride diffusivity of low parosity cement pastes
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Abstract This paper presents the results of an experimental investigation on the effect of silica fume on pore structure and diffusivity of low porosity cement pastes. For cement pastes with w/c ratios in the range of 0.20 to 0.30, a 10% replacement of the cement with silica fume only reduced the total porosity to a small extent. However, a refinement of the pore size distribution took place in such a way that the content of larger pores was reduced for decreasing w/c ratio. For pure portland cement pastes the effect of a certain constant change of w/c ratio on the chloride diffusivity was substantially higher at high w/c ratios than at low w/c ratios. A 10% replacement with silica fume reduced the chloride diffusivity for all w/c ratios so much that the effect of w/c ratio became less important.
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