Trimethylsilylation as a tool for the study of cement pastes (2) quantitative analysis of the silicate fraction of Portland cement pastes

✍ Scribed by E.E. Lachowski

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 370 KB
• Volume: 9
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(79)90126-1

✦ Synopsis

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 polysilicate derivatives all had maxima correspon@ ing to a degree of polymerisation (dp) of about 4 and shoulders at higher values; the weight average dp's were 14-17 and although the maximum dp's were high, only about 2% of the silica had dp's greater than 50. The mean connectivity of the polysilicates was 2.3.