Abstract
MgO-CaZrO3 based composite aggregates have been prepared by reaction sintering of dolomite and ZrO2. The sintered MgO-CaZrO3 aggregates were characterized in terms of bulk density, microstructure, thermal expansion, hot modulus of rupture and thermal shock resistance. It was found that the lime phase of dolomite was converted to high melting CaZrO3 whose high thermal expansion mismatch with MgO makes the aggregate thermal shock resistant due to the effect of micro cracking at the grain boundaries. The product may be useful as hydration and thermal shock resistant basic refractory aggregate.
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