Pozzolanic reactions of common natural zeolites with lime and parameters affecting their reactivity / G. Mertens in Cement and concrete research, Vol. 39 N° 3 (Mars 2009)  

Public ISBD [article]  inCement and concrete research > Vol. 39 N° 3 (Mars 2009) . - pp. 233–240 Titre : Pozzolanic reactions of common natural zeolites with lime and parameters affecting their reactivity Type de document : texte imprimé Auteurs : G. Mertens, Auteur ; R. Snellings, Auteur ; K. Van Balen, Auteur Année de publication : 2009 Article en page(s) : pp. 233–240 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Kinetics  Characterization  Ca(OH)2  Pozzolan  Zeolites Résumé : The pozzolanic reaction between portlandite and different types of nearly pure natural zeolites was studied. Analcime, phillipsite, chabazite, erionite, mordenite and clinoptilolite-rich tuffs were mixed with portlandite and water (1:1:2 by weight), and the progress of the pozzolanic reaction was quantitatively determined by thermogravimetrical analyses from 3 to 180 days. A thorough characterization of the raw materials was performed by quantitative XRD, XRF, SEM-EDX, BET specific surface area measurements, grain-size analyses, FTIR and Cation Exchange Capacity measurements. The difference in reactivity of the samples containing zeolites with varying Si/Al ratios, as well as between clinoptilolite-rich samples exchanged with different cations or ground to different grain sizes was assessed. The results indicate that the external surface area only influences the short-term reactivity, whereas the cation content has an effect on both the long- and short-term reactivity. The early reactivity of the unexchanged samples can be explained by these two parameters, but their long-term reactivity is mainly related to the Si/Al ratio of the zeolites. Samples with zeolites rich in Si react faster then their Al-rich counterparts. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884608002172 [article] Pozzolanic reactions of common natural zeolites with lime and parameters affecting their reactivity [texte imprimé] / G. Mertens, Auteur ; R. Snellings, Auteur ; K. Van Balen, Auteur . - 2009 . - pp. 233–240. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 3 (Mars 2009) . - pp. 233–240 Mots-clés : Kinetics  Characterization  Ca(OH)2  Pozzolan  Zeolites Résumé : The pozzolanic reaction between portlandite and different types of nearly pure natural zeolites was studied. Analcime, phillipsite, chabazite, erionite, mordenite and clinoptilolite-rich tuffs were mixed with portlandite and water (1:1:2 by weight), and the progress of the pozzolanic reaction was quantitatively determined by thermogravimetrical analyses from 3 to 180 days. A thorough characterization of the raw materials was performed by quantitative XRD, XRF, SEM-EDX, BET specific surface area measurements, grain-size analyses, FTIR and Cation Exchange Capacity measurements. The difference in reactivity of the samples containing zeolites with varying Si/Al ratios, as well as between clinoptilolite-rich samples exchanged with different cations or ground to different grain sizes was assessed. The results indicate that the external surface area only influences the short-term reactivity, whereas the cation content has an effect on both the long- and short-term reactivity. The early reactivity of the unexchanged samples can be explained by these two parameters, but their long-term reactivity is mainly related to the Si/Al ratio of the zeolites. Samples with zeolites rich in Si react faster then their Al-rich counterparts. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884608002172

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