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Investigate the composition, morphology, and textural differences of hydrated tricalcium silicate paste cured for one year.

Composition and Morphology of Hydrated Tricalcium Silicate

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Microstructural analysis demonstrates distinct textural phases in hydrated tricalcium silicate, revealing novel grain types and zoned gel products.

Investigate the composition, morphology, and textural differences of hydrated tricalcium silicate paste cured for one year.
Hardened tricalcium silicate (C3S) paste was cured for 1 year at 20°C.
Samples were etched with 1% nitric acid in alcohol or glycerol-alcohol (4:6 by volume) to extract free calcium hydroxide prior to scanning electron microscopy (SEM) and electron probe microanalysis (EPMA).
Etching with 1% nitric acid in alcohol clearly differentiated outer and inner calcium silicate hydrate (C-S-H) products, revealing zonal textures and 0.1 to 0.2 μm particles alongside unreacted cores.
Glycerol-alcohol extraction identified two distinct C-S-H grain types with calcium-to-silicon molar ratios greater than 3, characterized respectively by smooth surfaces and acicular outer gel coatings.

Goto et al. (1976) studied this question.

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Microstructural analysis demonstrates distinct textural phases in hydrated tricalcium silicate, revealing novel grain types and zoned gel products.