Microstructural analysis reveals uniform calcium-to-silicon ratios across hydration products in tricalcium silicate paste, indicating chemical consistency during cement hardening.
Mature tricalcium silicate cement pastes were examined in ion‐beam‐thinned sections. The microstructure consisted of very homogeneous amorphous hydrate gel surrounding residual unhydrated cores of tricalcium silicate, these regions being linked by a fibrillar outer hydration product. Carbonation had produced microcrystals of calcite within the outer product only. X‐ray microanalysis gave Ca: Si ratios for the hydrate regions which showed considerable deviations but were‐on average in fairly good agreement with indirectly determined Ca: Si ratios of pastes of the same material. There was no significant difference in composition between inner and outer hydration products.
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Groves et al. (1986) studied this question.
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