Abstract
Twenty-year-old and laboratory-prepared completely hydrated cement pastes were investigated by the trimethylsilylation technique. The resulting derivatives were separated by both gas and gel permeation chromatography (GPC). Separation of the non-volatile fraction of the trimethylsilyl derivatives was more efficient by the GPC technique. The trimethylsilyl derivatives of SiO 4 4− and Si 2O 7 6− ions were easily identified by GPC. The constitutions of the other silicate anion derivatives separated by GPC were inferred on the basis of their molecular weights, relative to those of SiO 4 4− and Si 2O 7 6− ions.
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