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The structure of the calcium silicate hydrate phases present in hardened pastes of white Portland cement/blast-furnace slag blends
The C-S-H gels present in both water- and alkali-activated hardened pastes of white Portland cement/blast-furnace slag blends have been studied by solid-state (29)Si magic angle spinning nuclear magnetic resonance (NMR) spectroscopy and analytical transmission electron microscopy (TEM). Structural data are obtained by NMR for semi-crystalline C-S-H gels in the alkali-activated systems and extended to the nearly amorphous gels in the water-activated systems by peak broadening; unambiguous chemical analyses are determined in the TEM. The following conclusions apply to both the semi-crystalline and nearly amorphous C-S-H gels: (1) aluminium substitutes for silicon at tetrahedral sites; (2) aluminium only substitutes for silicon in the central tetrahedron of pentametric silicate chains; (3) the results strenghten confidence in dreierkette-based models for the structure of C-S-H. Compositional similarities suggest that these conclusions will be true for OPC/slag blends, and possibly also for OPC/pulverized fuel ash blends indicating that the same structural model applies to the C-S-H gels in a wide range of hardened cement pastes.
The structure of the calcium silicate hydrate phases present in hardened pastes of white Portland cement/blast-furnace slag blends
The C-S-H gels present in both water- and alkali-activated hardened pastes of white Portland cement/blast-furnace slag blends have been studied by solid-state (29)Si magic angle spinning nuclear magnetic resonance (NMR) spectroscopy and analytical transmission electron microscopy (TEM). Structural data are obtained by NMR for semi-crystalline C-S-H gels in the alkali-activated systems and extended to the nearly amorphous gels in the water-activated systems by peak broadening; unambiguous chemical analyses are determined in the TEM. The following conclusions apply to both the semi-crystalline and nearly amorphous C-S-H gels: (1) aluminium substitutes for silicon at tetrahedral sites; (2) aluminium only substitutes for silicon in the central tetrahedron of pentametric silicate chains; (3) the results strenghten confidence in dreierkette-based models for the structure of C-S-H. Compositional similarities suggest that these conclusions will be true for OPC/slag blends, and possibly also for OPC/pulverized fuel ash blends indicating that the same structural model applies to the C-S-H gels in a wide range of hardened cement pastes.
The structure of the calcium silicate hydrate phases present in hardened pastes of white Portland cement/blast-furnace slag blends
Struktur der Kalziumsilikathydratphasen in erhärteten Massen aus weißem Portlandzement/Hochofenschlacken-Gemengen
Richardson, I.G. (author) / Groves, G.W. (author)
Journal of Materials Science ; 32 ; 4793-4802
1997
10 Seiten, 12 Bilder, 5 Tabellen, 31 Quellen
Article (Journal)
English
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