Silicon substitution for aluminum in calcium silicate hydrates

Authors
Faucon, P Petit, JC Charpentier, T Jacquinot, JF Adenot, F
Citation
P. Faucon et al., Silicon substitution for aluminum in calcium silicate hydrates, J AM CERAM, 82(5), 1999, pp. 1307-1312
Citations number
39
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
82
Issue
5
Year of publication
1999
Pages
1307 - 1312
Database
ISI
SICI code
0002-7820(199905)82:5<1307:SSFAIC>2.0.ZU;2-I
Abstract
Al-27 MAS and multiquantum (MQ) MASNMR (magic-angle spinning nuclear magnet ic resonance) spectroscopy were used to study the substitution of silicon b y aluminum in calcium silicate hydrates (C-S-H), which are the main compone nt of hydrated portland cement. Synthetic C-S-H samples were prepared, and their chemical stability was studied. Two-dimensional 3Q-MASNMR spectra rev ealed the chemical shift and quadrupolar parameters (delta(iso), nu(Q)) tha t labeled aluminum sites in the C-S-H. Tetrahedral aluminum was observed in the bridging and nonbridging sites of the silicate chains.