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Mechanochemical capillary reactions in partly dehydrated gypsum and aluminium hydroxide interground powder mixtures
Gypsum and alumina (or gypsum-hemihydrate + alumina) mixtures were activated by intensive grinding in a water-cooled planetary mill. Water vapour adsorption, heat of solution, phase composition (by XRD) and activation energy of eliminated water (by thermal methods) of activated and non-activated samples were measured. Thermal treatment of mechanically activated samples results in a much more intensive formation of crystalline products, thus e.g. the amount of calcium sulfoaluminate after a 2 hr/1200 deg C heat treatment of the gypsum + Al(OH)3 sample is much higher in activated samples. Based on these model experiments, it is concluded that gels are formed during mechanical activation, due to chemisorption and mechanochemical capillary reactions, which, in turn, act as crystallization nuclei, greatly affecting thermal reactions.
Mechanochemical capillary reactions in partly dehydrated gypsum and aluminium hydroxide interground powder mixtures
Gypsum and alumina (or gypsum-hemihydrate + alumina) mixtures were activated by intensive grinding in a water-cooled planetary mill. Water vapour adsorption, heat of solution, phase composition (by XRD) and activation energy of eliminated water (by thermal methods) of activated and non-activated samples were measured. Thermal treatment of mechanically activated samples results in a much more intensive formation of crystalline products, thus e.g. the amount of calcium sulfoaluminate after a 2 hr/1200 deg C heat treatment of the gypsum + Al(OH)3 sample is much higher in activated samples. Based on these model experiments, it is concluded that gels are formed during mechanical activation, due to chemisorption and mechanochemical capillary reactions, which, in turn, act as crystallization nuclei, greatly affecting thermal reactions.
Mechanochemical capillary reactions in partly dehydrated gypsum and aluminium hydroxide interground powder mixtures
Mechanochemische Kapillarreaktion in vermahlenen Mischungen von teilweise dehydratisiertem Gips und Aluminiumhydroxid
Kollath, B. (author) / Juhasz, A.Z. (author)
Cement and Concrete Research ; 26 ; 1843-1857
1996
15 Seiten, 8 Bilder, 2 Tabellen, 14 Quellen
Article (Journal)
English
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