Synthesis and characterisation of lithium and sodium doped C-S-H

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Conference12th International Congress on the Chemistry of Cement: 08 July 2007, Montreal, QC.
Pages117; # of pages: 17
SubjectC-S-H; lithium; Concrete
AbstractPure and doped calcium silicate hydrates (C-S-H) were synthesised and characterised. Pure preparations with calcium to silica (C/S) ratios ranging from 0.6 to 2.0 were made. Doped preparations with C/S ratios of 1.0 and 1.7 were synthesised with one molar lithium and sodium hydroxide solutions. Each preparation was characterised using Nuclear Magnetic Resonance (NMR), X-ray Diffraction (XRD), Fourier Transform InfraRed (FTIR) spectroscopy, and Scanning Electron Microscopy (SEM). As expected, results for the pure control C-S-H preparations largely agreed with published literature. The lithium and sodium doped preparations both contain residual Ca(OH)2, indicating that their final C/S ratio is not equal to that of the starting materials. The lithium-doped material at low C/S ratio (1.0) exhibits chemical and structural behaviour more consistent with a pure C-S-H having a higher C/S ratio (1.7). Sodium doped C-S-H exhibited characteristics consistent with that of the purer control preparations.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number50077
NPARC number20377742
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Record identifier6ad50669-3e97-4c1d-bf15-0a47f0b5561e
Record created2012-07-24
Record modified2016-05-09
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