Effect on fresh C-S-H gels of the simultaneous addition of alkali and aluminium

Ines Garcia Lodeiro, Aday Jimenez, A. Palomo, Donald E MacPhee

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Abstract

Reducing Portland cement content in cementitious binders offers a means to address the adverse environmental impacts of Portland cement manufacture. This paper investigates the impacts on hydration product chemistry of partially replacing Portland cement with alkali-activated aluminosilicates. Here, short-term effects of soluble alkali and aluminium, likely to be available in an alkali-activated system, on the structure of synthetic C-S-H gels are assessed. C-S-H gels (synthesized at pH values of over 13) were mixed with different concentrations of aluminium nitrate and sodium hydroxide. The gels were characterized by FTIR, TEM/EDX and XRD 72 h later. The results showed that both alkali and aluminium increased the degree of silicate polymerisation in the C-S-H gels and precipitated a crystalline calcium aluminosilicate phase. (C) 2009 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)27-32
Number of pages6
JournalCement and Concrete Research
Volume40
Issue number1
Early online date8 Sep 2009
DOIs
Publication statusPublished - Jan 2010

Keywords

  • Calcium-Silicate-Hydrate (C-S-H)
  • Spectroscopy
  • TEM
  • Stratlingite
  • calcium-silicate-hydrate
  • nulear-magnetic-resonance
  • substitued tobermorites
  • Portland cements
  • phase-relations
  • activated slag
  • AL-27
  • SI-29
  • metakaolin
  • NMR

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