Abstract
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 9–11% of the silica as monomer, 22–30% as dimer and 44–57% as polysilicate. Gel-permeation chromatograms of the polysilicate derivatives all had maxima corresponding 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.
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