Effect of Binders and Distribution Coefficient on the Properties of High Alumina Castables

Two different binder system, namely high alumina cement and silica sol, were used in high alumina castables, with different particle size distributions (PSDs). Distribution coefficients of 0.23 and 0.29, as per Dinger and Funk model were used to vary the PSDs of the castables and obtained self flowing and vibrational consistency in the prepared castable composition respectively. The castables were processed conventionally and various properties were evaluated and compared after heat treatment at 110 degrees C, 900 degrees C and 1600 degrees C. Relatively lower density and cold crushing strength values were obtained for the sol containing fired castables, due to the formation of mullite phase.