Quantitative determination of anhydrite III from dehydrated gypsum by XRD / Sebastian Seufert in Cement and concrete research, Vol. 39 N° 10 (Octobre 2009)  

Public ISBD [article]  inCement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. 936–941 Titre : Quantitative determination of anhydrite III from dehydrated gypsum by XRD Type de document : texte imprimé Auteurs : Sebastian Seufert, Auteur ; C. Hesse, Auteur ; F. Goetz-Neunhoeffer, Auteur Année de publication : 2009 Article en page(s) : pp. 936–941 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Portland cement  Hydration  X-ray diffraction characterization  Calcium sulfate Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Technical OPC contains mixed sulfate carriers in varying amounts. Gypsum and anhydrite are added to the clinker during the milling process where the gypsum dehydrates partially to bassanite and anhydrite. Due to different hydration kinetics of these phases, it is crucial to be able to characterize the composition of sulfate in a cement system to reach an optimal and reproducible cement hydration. In the current paper different calcium sulfate compositions are investigated by XRD methods in order to identify phase content. Special focus is put on the discrimination of the hemihydrate (bassanite) and anhydrite III as well as on transformation processes of anhydrite III through ambient humidity. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001483 [article] Quantitative determination of anhydrite III from dehydrated gypsum by XRD [texte imprimé] / Sebastian Seufert, Auteur ; C. Hesse, Auteur ; F. Goetz-Neunhoeffer, Auteur . - 2009 . - pp. 936–941. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. 936–941 Mots-clés : Portland cement  Hydration  X-ray diffraction characterization  Calcium sulfate Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Technical OPC contains mixed sulfate carriers in varying amounts. Gypsum and anhydrite are added to the clinker during the milling process where the gypsum dehydrates partially to bassanite and anhydrite. Due to different hydration kinetics of these phases, it is crucial to be able to characterize the composition of sulfate in a cement system to reach an optimal and reproducible cement hydration. In the current paper different calcium sulfate compositions are investigated by XRD methods in order to identify phase content. Special focus is put on the discrimination of the hemihydrate (bassanite) and anhydrite III as well as on transformation processes of anhydrite III through ambient humidity. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001483

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