Effect on fresh C-S-H gels of the simultaneous addition of alkali and aluminium / I. García Lodeiro in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010)  

Public ISBD [article]  inCement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 27-32 Titre : Effect on fresh C-S-H gels of the simultaneous addition of alkali and aluminium Type de document : texte imprimé Auteurs : I. García Lodeiro, Auteur ; A. Fernandez-Jimenez, Auteur ; A. Palomo, Auteur Article en page(s) : pp. 27-32 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Calcium-Silicate-Hydrate (C-S-H) Spectroscopy TEM Stratlingite Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : 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. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4X5YWSN-2&_user=6 [...] [article] Effect on fresh C-S-H gels of the simultaneous addition of alkali and aluminium [texte imprimé] / I. García Lodeiro, Auteur ; A. Fernandez-Jimenez, Auteur ; A. Palomo, Auteur . - pp. 27-32. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 27-32 Mots-clés : Calcium-Silicate-Hydrate (C-S-H) Spectroscopy TEM Stratlingite Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : 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. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4X5YWSN-2&_user=6 [...]

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