Abstract
Authors activate gypsum and alumina (or gypsum-hemihydrate + alumina) mixtures by intensive grinding in a water-cooled planetary mill and measure 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. 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 °C heat treatment of the gypsum + A1(OH) 3 sample is much higher in activated samples. Based on these model experiments, authors conclude 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.
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