Silicon Substitution for Aluminum in Calcium Silicate Hydrates |
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| Authors: | Pascal Faucon J Claude Petit Thibault Charpentier J François Jacquinot Fredéric Adenot |
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| Affiliation: | Service de Chimie Moléculaire, CEA Saclay, 91191 Gif sur Yvette, France;Service de Physique de l'Etat Condensé, CEA Saclay, 91191 Gif sur Yvette, France;Service d'Entreposage et de Stockage des Déchets, CEA Saclay, 91191 Gif sur Yvette, France |
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| Abstract: | 27Al MAS and multiquantum (MQ) MASNMR (magic-angle spinning nuclear magnetic resonance) spectroscopy were used to study the substitution of silicon by aluminum in calcium silicate hydrates (C-S-H), which are the main component of hydrated portland cement. Synthetic C-S-H samples were prepared, and their chemical stability was studied. Two-dimensional 3Q-MASNMR spectra revealed the chemical shift and quadrupolar parameters (deltaiso, nuQ) that labeled aluminum sites in the C-S-H. Tetrahedral aluminum was observed in the bridging and nonbridging sites of the silicate chains. |
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