The magnesia-silica gel phase in slag cements: alkali (K, Cs) sorption potential of synthetic gels

D M R Brew, F P Glasser

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Blends of Portland cement with blast furnace slag hydrate to yield two gel phases, one essentially a calcium silicate hydrate (C-S-H) composition, the other a magnesium silicate hydrate (M-S-H) composition: the two gel phases are essentially immiscible. Together, the gel phases comprise an important source of sorption potential for the alkalis present in ordinary cement and blending agents. M-S-H gels have been synthesised and their sorption potential measured for postassium (K) and cesium (Cs) at 25 degreesC by using fresh gels as well as gels previously aged at 85 degreesC for 6 months. The ability of slag-cement blends to lower pore fluid alkalinity generally, and in nuclear waste technology to incorporate Cs, is interpreted in terms of the sorption data. (C) 2004 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)77-83
Number of pages7
JournalCement and Concrete Research
Publication statusPublished - 2005


  • M-S-H gel
  • alkali sorption
  • pore fluids
  • Cs
  • cement paste
  • S-H GELS

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