Effect of C/S Ratios on Morphology of Calcium Silicate Hydrates Synthesized by Solution Reaction Method

Calcium-silicate-hydrates(C—S—H) are one of the main hydration products and are of great importance to the properties of concrete.C—S—H with initial C/S ratios of 1.0,1.3,1.5 and 1.7 were synthesized by the solution reaction of calcium nitrate(Ca(NO3)2·4H2O),Sodium nitrate(Na2SiO3·9H2O) and deionized water at the temperature of 60 ℃.Morphology of synthesized C—S—H samples were investigated by SEM technique.Results indicate that morphology of C—S—H samples varied from flake-like shapes to honey-combed shapes as C/S ratio increased.