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Effect of elevated temperatures on geopolymer paste, mortar and concrete / Daniel L. Y. Kong 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. 334-339 Titre : Effect of elevated temperatures on geopolymer paste, mortar and concrete Type de document : texte imprimé Auteurs : Daniel L. Y. Kong, Auteur ; Jay G. Sanjayan, Auteur Année de publication : 2010 Article en page(s) : pp. 334-339 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Geopolymer  Fly  ash  Temperature  Aggregates  Concrete Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Geopolymers are generally believed to provide good fire resistance due to their ceramic-like properties. Previous experimental studies on geopolymer under elevated temperatures have mainly focused on metakaolin-based geopolymers. This paper presents the results of a study on the effect of elevated temperature on geopolymer paste, mortar and concrete made using fly ash as a precursor. The geopolymer was synthesized with sodium silicate and potassium hydroxide solutions. Various experimental parameters have been examined such as specimen sizing, aggregate sizing, aggregate type and superplasticizer type. The study identifies specimen size and aggregate size as the two main factors that govern geopolymer behavior at elevated temperatures (800 °C). Aggregate sizes larger than 10 mm resulted in good strength performances in both ambient and elevated temperatures. Strength loss in geopolymer concrete at elevated temperatures is attributed to the thermal mismatch between the geopolymer matrix and the aggregates. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XPXT87-1&_user=6 [...] [article] Effect of elevated temperatures on geopolymer paste, mortar and concrete [texte imprimé] / Daniel L. Y. Kong, Auteur ; Jay G. Sanjayan, Auteur . - 2010 . - pp. 334-339. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 334-339 Mots-clés : Geopolymer  Fly  ash  Temperature  Aggregates  Concrete Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Geopolymers are generally believed to provide good fire resistance due to their ceramic-like properties. Previous experimental studies on geopolymer under elevated temperatures have mainly focused on metakaolin-based geopolymers. This paper presents the results of a study on the effect of elevated temperature on geopolymer paste, mortar and concrete made using fly ash as a precursor. The geopolymer was synthesized with sodium silicate and potassium hydroxide solutions. Various experimental parameters have been examined such as specimen sizing, aggregate sizing, aggregate type and superplasticizer type. The study identifies specimen size and aggregate size as the two main factors that govern geopolymer behavior at elevated temperatures (800 °C). Aggregate sizes larger than 10 mm resulted in good strength performances in both ambient and elevated temperatures. Strength loss in geopolymer concrete at elevated temperatures is attributed to the thermal mismatch between the geopolymer matrix and the aggregates. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XPXT87-1&_user=6 [...]