The trimethylsilyl derivatives of the silicate fractions of three fully hydrated Portland cement pastes have been studied by gas-liquid and gel-permeation chromatography. The pastes had 9-II% of the silica as monomer, 22-30% as dimer and 44-57% as polysilicate. Gel-permeation chromatograms of the po
A new characterization technique for trimethylsilylated products of old cement pastes
β Scribed by Asok K. Sarkar; Della M. Roy
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 646 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0008-8846
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β¦ Synopsis
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~" and Si20)" 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~" and Si20)-ions.
Zwanzig jahre alte und vollst~ndig hydratisierte, im Laboratorium aufbereitete, Zement-Pasten wurden mit der Trimethylsilylierungs-Technik untersucht. Die untersuchten Derivate wurden sowohl mit Gas-als auch mit Gel-Permeations-Chromatographie (GPC) getrennt. Die Trennung des nicht-flUchtigen Anteils der Trimethylsilyl-Derivate war effizienter mit der GPC-Technik. Die Trimethylsilyl-Derivate von SiO~-und Si20 ~-Ionen wurden mit der GPC-Technik leicht festgestellt. Die Zusammensetzungen der anderen Silikat-Anionen-Derivate, getrennt mit der GPC-Technik, wurde aus der Relation ihrer Molekulargewichte zu der SiO~und Si20)-Ionen berechnet.
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