Synthesis and characterisation of magnesium silicate hydrate gels |
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Authors: | DRM Brew |
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Affiliation: | School of Engineering and Physical Sciences, University of Aberdeen, 033 Meston Building, Aberdeen AB24 3UE, Scotland, UK |
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Abstract: | Magnesium silicate hydrate gels (M-S-H) have been prepared by precipitation. The range of gel compositions lie between Mg/Si molar ratios 0.67-1.0. The gels were subject to short cure, approximately 24 h at approximately 22 °C and longer cure, 180 days at 85 °C, following which they were characterised by XRD, FT-IR and solid-state 29Si NMR. Ageing at longer times and higher temperatures somewhat improves the local ordering. The nature of the partially ordered structures is related to those of M-S-H mineral phases. The structures and compositions of M-S-H gels differ from those of C-S-H gels and partly on that account, C-S-H gels contain little magnesium while M-S-H gels in blended cements coexist with C-S-H but contain little calcium. |
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Keywords: | MgO-SiO2-H2O gels MgO-SiO2-H2O minerals 29Si NMR FT-IR Gel structures |
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