INFLUENCE OF SUBSTITUTION OF ORDINARY PORTLANDCEMENT BY SILICA FUME ON THE HYDRATION OF SLAG-PORTLAND CEMENT PASTES

摘要

Effect of gradual substitution of ordinary Portland cement by a few percent of silica fume (0.0, 2.5, 5.0 and 7.5 wt.%) on the hydration properties of slag-Portland cement pastes up to 12 months was investigated. The results show that the composite cement pastes containing silicafume give the higher physico-mechanical properties than that of the slag-Porlland cement. Also, the XRD results reveal that the peak of Ca(OH)_2 shows higher intensity in the sample without silica fume and completely disappears in the sample containing 7.5 wt.% silicafume content. Also, the intensity peaks of C_4AH_(13) sharply increase with silicafume content.