Abstract
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 language | English |
|---|---|
| Pages (from-to) | 147-153 |
| Number of pages | 7 |
| Journal | Cement and Concrete Research |
| Volume | 39 |
| Issue number | 3 |
| Early online date | 1 Feb 2009 |
| DOIs | |
| Publication status | Published - 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.Keywords
- Calcium-Silicate-Hydrate (C-S-H)
- Spectroscopy
- Alkalis
- calcium silicate hydrate
- fly-ash
- elevated-temperatures
- structural features
- part I
- carbonation
- concrete
- cement
- NMR
- spectroscopy