Abstract
Magnesites from different sources in India were studied for their hydration susceptibility on calcination in the range of 1400°C to 2000°C. Hydration on weathering over steam bath becomes negligibly small on calcination around 1650°C. But autoclaving in a saturated steam atmosphere causes serious deterioration for samples calcined upto 1700°C. Presence of impurities other than CaO, favouring development of various silicates and magnesio-ferrite offers resistance to hydration. The inherent hydration tendency may be largely overcome only with development of a rigid microstructure comprised of a solid continuum and a minimum of voids after calcination at 1800°C. The trend of hydration susceptibility of magnesites agrees closely with the other characteristics of sintering.
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