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Abstract
Two calcium aluminate cements comprising predominantly of CaO.Al2O3 and CaO.Al2O3 respectively were prepared by sintering process. These cements were used in different proportions along with Assam sillimanite, calcined kyanite and calcined Kashmir bauxite as refractory castables. The physical and refractory properties such as apparent porosity, bulk density, modulus of rupture, refractoriness underload, PCE, spalling resistance and also modulus of rupture and linear change after firing to different temperatures were determined.
Castables with kyanite as aggregate material had the best refractory properties. The refractoriness of the castables was adversely affected due to the presence of titania in the aggregate materials.