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The evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers / Jae Eun Oh in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 189-196 Titre : The evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers Type de document : texte imprimé Auteurs : Jae Eun Oh, Auteur ; Paulo J.M. Monteiro, Auteur ; Ssang Sun Jun, Auteur Année de publication : 2010 Article en page(s) : pp. 189-196 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Alkali-activated  cement  Geopolymer  X-ray  diffraction  Fly  ash  Granulated  blast  furnace  slag Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The increase in strength and evolution of crystalline phases in inorganic polymer cement, made by the alkali activation of slag, Class C and Class F fly ashes, was followed using compressive strength test and synchrotron X-ray diffraction. In order to increase the crystallinity of the product the reactions were carried out at 80 °C. We found that hydrotalcite formed in both the alkali-activated slag cements and the fly ash-based geopolymers. Hydroxycancrinite, one member of the ABC-6 family of zeolites, was found only in the fly ash geopolymers. Assuming that the predominantly amorphous geopolymer formed under ambient conditions relates to the crystalline phases found when the mixture is cured at high temperature, we propose that the structure of this zeolitic precursor formed in Na-based high alkaline environment can be regarded as a disordered form of the basic building unit of the ABC-6 group of zeolites which includes poly-types such as hydroxycancrinite, hydroxysodalite and chabazite-Na. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XNVTFP-1&_user=6 [...] [article] The evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers [texte imprimé] / Jae Eun Oh, Auteur ; Paulo J.M. Monteiro, Auteur ; Ssang Sun Jun, Auteur . - 2010 . - pp. 189-196. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 189-196 Mots-clés : Alkali-activated  cement  Geopolymer  X-ray  diffraction  Fly  ash  Granulated  blast  furnace  slag Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The increase in strength and evolution of crystalline phases in inorganic polymer cement, made by the alkali activation of slag, Class C and Class F fly ashes, was followed using compressive strength test and synchrotron X-ray diffraction. In order to increase the crystallinity of the product the reactions were carried out at 80 °C. We found that hydrotalcite formed in both the alkali-activated slag cements and the fly ash-based geopolymers. Hydroxycancrinite, one member of the ABC-6 family of zeolites, was found only in the fly ash geopolymers. Assuming that the predominantly amorphous geopolymer formed under ambient conditions relates to the crystalline phases found when the mixture is cured at high temperature, we propose that the structure of this zeolitic precursor formed in Na-based high alkaline environment can be regarded as a disordered form of the basic building unit of the ABC-6 group of zeolites which includes poly-types such as hydroxycancrinite, hydroxysodalite and chabazite-Na. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XNVTFP-1&_user=6 [...]