Aggressive attack of pozzolanic-filled cement

In this study, the silica fume was used to improve the physicochemical and mechanical properties of the cement. It is impairing the resistance of the concrete or mortar to deterioration in any way or reducing the corrosion protection of reinforcement. The present investigation aimed to study the effect of substitution of limestone with silica fume in filled cement. The effect of silica fume replacement was studied by the determination of water of consistency, initial and final setting times, combined water, free lime contents, total porosity and compressive strength of cement pastes. The results show that the substitution of silica fume increases the water of consistency, initial and final setting times, combined water contents as well as total porosity, whereas the free lime and compressive strength decreases with silica fume content.