Characteristics of Portland cement pastes with high replacement of slag

The influence of substitution of Ordinary Portland cement by ground granulated blast-furnace slag up to 70 % on the properties of silica fume-Portland cement composite pastes up to 12 months was studied. After one year, the composite cements pastes containing 50-70 % slag exhibit suitable strength values compared to without slag sample. Also, The XRD results show that the C-S-H are intensified with available increase indicating more dense structures and large amount of additional C-S-H in the presence slag content.