Abstract
AbstractThe effect of finely ground topaz on the fired strength of refractory concrete was investigated. A quantity of topaz equal in weight to the cement was added to the commonly used mixtures of calcium‐aluminate cement and grog. When fired at 1600°F. and above, the mixtures with topaz developed strengths three to six times those of the mixtures without topaz. Comparable fired strengths were obtained when potter's flint or silica flour was substituted for one half of the topaz admixture. A.S.T.M. standard refractory tests, with some variations, were made on different refractory concrete mixtures. Results of tests are reported and applications where use of topaz admixture is advantageous are suggested.
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