Abstract
AbstractA study was made of the properties of calcium sulphate hemihydrate prepared by the calcination of dihydrate formed in a medium containing finally 29·4% P2O5 and 5·6% H2SO4. When the original dihydrate had been precipitated in uncontaminated acid, hydration of the hemihydrate seemed to be normal. However, when the medium of precipitation contained hydrofluoric acid and salts of iron and aluminium, the calcination product was not susceptible to a retarder that markedly affected the hydration of commercial calcined gypsum. The presence of P2O5 did not appear to be responsible for this type of defect.The bulk volume and water requirement seemed to be normal when the crystal forms of the component grains were normal.Observations are made on the strengths of the derived cast gypsum.
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