Conversion of silica-containing additives upon testing of cement compositions for alkali expansion

Conversion of silica-containing additives upon testing of cement compositions for alkali expansion The peculiar features of the conversion processes proceeding upon the mortar-bar tests [GOST(State Standard) 8269.0] of high-dispersion silica-containing additives (silica fume, metakaolin, and precipitated silica) in the composition of a cement stone and sand-cement mortars at 20 and 80°C were studied. According to the solid-state NMR spectroscopy at 80°C, the additives rapidly loss phase individuality by reacting with Ca(OH)2 to form calcium silica hydrogel (C-S-H), with Portland cement hydration in the presence of mineral additives proceeding slower than in the initial stone. Compared to Portland cement gel, the C-S-H product formed by the additives is characterized by lower Ca/Si ratio, longer aluminum-silicon-oxygen structural chains, and by higher content of aluminum in them. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

Conversion of silica-containing additives upon testing of cement compositions for alkali expansion

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2012 by Pleiades Publishing, Ltd.
Subject
Chemistry; Industrial Chemistry/Chemical Engineering; Chemistry/Food Science, general
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S1070427212090030
Publisher site
See Article on Publisher Site

Abstract

The peculiar features of the conversion processes proceeding upon the mortar-bar tests [GOST(State Standard) 8269.0] of high-dispersion silica-containing additives (silica fume, metakaolin, and precipitated silica) in the composition of a cement stone and sand-cement mortars at 20 and 80°C were studied. According to the solid-state NMR spectroscopy at 80°C, the additives rapidly loss phase individuality by reacting with Ca(OH)2 to form calcium silica hydrogel (C-S-H), with Portland cement hydration in the presence of mineral additives proceeding slower than in the initial stone. Compared to Portland cement gel, the C-S-H product formed by the additives is characterized by lower Ca/Si ratio, longer aluminum-silicon-oxygen structural chains, and by higher content of aluminum in them.

Journal

Russian Journal of Applied ChemistrySpringer Journals

Published: Oct 16, 2012

References

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