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- W2014302856 abstract "The effect of adding increasing amounts of calcium oxide (CaO) in the pH range 3–11 on the rate of hydration and physical properties of calcined by-product gypsums from four Australian locations was examined. The results were interpreted in terms of the Ridge equation. It was found that, as pH increased by the addition of small quantities of CaO, the kinetic parameters changed greatly. In particular, the velocity constant k gradually decreased, while α0, the measure of heterogeneous nucleation, increased. In general, increases in pH resulted in longer setting times but little change in water requirement. The mechanical strength of cast by-product gypsum increased with the addition of CaO up to about pH 7–8, then decreased in the alkaline region. Below about pH 7 the kinetics of hydration of the hemihydrates were in close accordance with the model developed by Ridge, but differed from it above pH 7–8. This may be due to poisoning of the gypsum nuclei by habit modifiers, which are present in small quantities in by-product gypsum." @default.
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- W2014302856 date "2007-04-24" @default.
- W2014302856 modified "2023-10-16" @default.
- W2014302856 title "Effect of calcium oxide on the hydration of calcined by-product gypsum" @default.
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- W2014302856 doi "https://doi.org/10.1002/jctb.5030320508" @default.
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