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Effect of alkalis on fresh C–S–H gels. FTIR analysis / I. García Lodeiro in Cement and concrete research, Vol. 39 N° 3 (Mars 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 3 (Mars 2009) . - pp. 147–153 Titre : Effect of alkalis on fresh C–S–H gels. FTIR analysis Type de document : texte imprimé Auteurs : I. García Lodeiro, Auteur ; D.E. Macphee, Auteur ; A. Palomo, Auteur Année de publication : 2009 Article en page(s) : pp. 147–153 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Calcium–Silicate–Hydrate  (C–S–H);  Spectroscopy;  Alkalis Résumé : 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. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000039 [article] Effect of alkalis on fresh C–S–H gels. FTIR analysis [texte imprimé] / I. García Lodeiro, Auteur ; D.E. Macphee, Auteur ; A. Palomo, Auteur . - 2009 . - pp. 147–153. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 3 (Mars 2009) . - pp. 147–153 Mots-clés : Calcium–Silicate–Hydrate  (C–S–H);  Spectroscopy;  Alkalis Résumé : 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. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000039