Effect of alkalis on fresh C-S-H gels: FTIR analysis

Ines Garcia Lodeiro* (Corresponding Author), Donald E MacPhee, A. Palomo, A. Fernandez-Jimenez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

492 Citations (Scopus)


The present study addresses the effect of different concentrations of Na2O on the structure of a composition of fresh C-S-H gels. The gels were synthesized from laboratory reagents, using calcium nitrate as the source of calcium and a sodium silicate solution for the silicon. A 10-M solution of NaOH was used to maintain a pH of over 13 throughout. The synthesized gels were exposed to different amounts of 8-M NaOH to determine their chemical stability and subsequently characterized with Fourier transform IR spectroscopy. The results showed that the addition of different concentrations of sodium leads to C-S-H gel modification even in the very short term. (C) 2009 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)147-153
Number of pages7
JournalCement and Concrete Research
Issue number3
Early online date1 Feb 2009
Publication statusPublished - Mar 2009

Bibliographical note

The present research was funded by the Ministry of Education and Science through project BIA2004-04835 and by the Spanish Council for Scientific Research in the form of the award of pre-doctoral grant I3P to Inés García-Lodeiro and a post-doctoral contract (ref. I3P-PC2004L) to Dr Ana Fernández-Jiménez.


  • Calcium-Silicate-Hydrate (C-S-H)
  • Spectroscopy
  • Alkalis
  • calcium silicate hydrate
  • fly-ash
  • elevated-temperatures
  • structural features
  • part I
  • carbonation
  • concrete
  • cement
  • NMR
  • spectroscopy


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