Hydration of MgO/SiO{sub 2} and Portland cement mixtures: A structural investigation of the hydrated phases by means of X-ray diffraction and solid state NMR spectroscopy
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Research Council − CNR, 56124 Pisa (Italy)
- Department of Chemistry “Ugo Schiff” & CSGI, University of Florence, 50019 Sesto Fiorentino (Italy)
The phases formed during the hydration of several MgO/SiO{sub 2} and Portland cement mixtures were investigated by performing X-ray diffraction and {sup 29}Si and {sup 27}Al solid state NMR experiments on samples hydrated for 1, 7 and 28 days. The structural properties and relative amount of magnesium silicate hydrate (M-S-H) and calcium silicate hydrate (C-S-H) gels, which form as separate phases, were found to significantly depend on the initial composition of the mixtures. Faster hydration kinetics was observed for all mixtures with respect to the “pure” MgO/SiO{sub 2} and Portland cement samples, pH and excess of silica playing a major role. Moreover, the addition of the MgO/SiO{sub 2} mixture to Portland cement affects the formation of aluminum-containing hydrated phases.
- OSTI ID:
- 22701582
- Journal Information:
- Cement and Concrete Research, Vol. 102; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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