Synthesis and characterisation of magnesium silicate hydrate gels

D R M Brew, F P Glasser

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188 Citations (Scopus)

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 degreesC and longer cure, 180 days at 85 degreesC, following which they were characterised by XRD, FT-IR and solid-state Si-29 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. (C) 2004 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)85-98
Number of pages14
JournalCement and Concrete Research
Volume35
DOIs
Publication statusPublished - 2005

Keywords

  • MgO-SiO2-H2O gels
  • MgO-SiO2-H2O minerals
  • Si-29 NMR
  • FT-IR
  • gel structures
  • PORTLAND-CEMENT PASTE
  • SULFATE ATTACK
  • SPECTROSCOPY
  • MINERALS

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