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Abstract

Effect of gradually substitution of ordinary Portland cement by a few percent of silica fume (0.0, 2.5, 5.0 and 7.5 wt. %) on the durability of slag-Portland cement pastes up to 12 months immersed in sea water was investigated. The results show that the substitution of Portland cement by silica fume in the granulated slag-Portland cement pastes improves the physico-mechanical properties of the hardened cement pastes especially at early ages as well as gives a better resistance of cement stone to sea water attack at all immersing time. Also, the composite cement pastes containing 7.5% silica fume showed a maximum durability than other samples.