Properties of Some Calcium Aluminate Cement Compositions

The properties of some high-purity calcium aluminate cement compositions in that portion of the lime-alumina system from 64 to 86% alumina were investigated. The laboratory preparation of seven hydraulic compositions in this system is described. Methods of appraising the properties, both in the neat cement and in castable formulations, are given. Data on bond strength, setting properties, heat of hydration, refractoriness, and aging characteristics are presented. A cement composition represented by the empirical molar formula CaO 2. 5Al2O3 was found to be optimum for balanced bond strength and refractoriness in high-temperature castables.