Abstract
The morphology of a one month old hydrated C 3S paste has been studied using the scanning electron microscope (SEM) and preferential etching techniques. The C/S ratios of the calcium silicate hydrates (CSH) have been determined using the SEM with an energy dispersive spectrometer. The hydrate rims covering the partially hydrated C 3S grains were found to consist of two layers; an outer porous product with an acicular morphology having a C/S ratio of 1.6 ± 0.1 and an inner product with a C/S ratio of 1.90 ± 0.05. A region of increased C/S ratio in the C 3S core at the C 3S-CSH interface is attributed to a depletion of SiO 2 resulting from the diffusion of Si 4+ ions into the hydrate.
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