Synthesis and characterisation of magnesium silicate hydrate gels

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 characteris...

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Veröffentlicht in:Cement and concrete research 2005, Vol.35 (1), p.85-98
Hauptverfasser: Brew, D.R.M., Glasser, F.P.
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Glasser, F.P.
description 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.
doi_str_mv 10.1016/j.cemconres.2004.06.022
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subjects 29Si NMR, FT-IR
Analysis of cement phases and constituents
Applied sciences
Buildings. Public works
Cement concrete constituents
Cements
Exact sciences and technology
Gel structures
Materials
MgO–SiO 2–H 2O gels
MgO–SiO 2–H 2O minerals
Properties of anhydrous and hydrated cement, test methods
title Synthesis and characterisation of magnesium silicate hydrate gels
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