Alumina Magnesia Castables: effect of curing conditions and matrix composition on development of green cold crushing strength and hydration resistance

摘要

The effect of curing conditions such as temperature, relative humidity and time on the green cold crushing strength development (GCCS) and on the hydration resistance of alumina-magnesia castables based on 70 percent CAC and 80 percent CAC were investigated. The results have shown that better properties were achieved with the 70 percent CAC although the 80 percent CAC was more stable regarding to changes on the curing condition. It was also observed that the presence of magnesia had an interesting effect in terms of decreasing the setting time and improving the GCCS of the castable mainly when the curing step was at low temperature. In terms of hydration resistance, microsilica addition was effective when combined with 70 percent CAC.