Effect of Alkalis on Fresh C-S-H Gels. FTIR Analysis

By I. G. Lodeiro, D. Macphee, A. Palomo, A. Fernández-Jiménez. 2009

783 citations recorded by the source corpus.

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.

Subfields: Civil and Structural Engineering, Earth-Surface Processes, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/5be381b9198b42427ff09af656d9ae055c44c49c

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In Civil and Structural Engineering

1. N. Neithalath
2. Nima Farzadnia
3. D. Ravikumar
4. H. A. A. Gawwad
5. H. Khater
6. Sundararaman Chithiraputhiran
7. H. Brouwers
8. Q. Yu

In Earth-Surface Processes

1. D. Ravikumar
2. H. Khater
3. N. Neithalath

Citations in the corpus

• Effects of activator characteristics on the reaction product formation in slag binders activated using alkali silicate powder and NaOH (2012, background): “In general, for C–S–H and C–A–S–H systems, the Si–O–Si stretching bands are generally observed at a wavenumber of 950– 1000 cm 1 [22,29–31], associated with a silica network that is not highly polymerized.”