Abstract
Abstract (1) It was found that the soluggish inversion of silica stones of different geological origins, from quartz to cristobalite, was the primary reaction when fired in air, in steam or in reducing atmosphere of carbon monoxide. (2) Effect of firing atmosphere on the conversion rate of silica stone was investigated. (3) Influence of grain size on the rate of conversion was investigated, and it was found that Jander’s, relation k∼1⁄δ2 was not applicable to the conversion of silica stone. (4) Irreversible thermal dilatation of anisotropic aggregates was examined, and the necessary correction to determine the conversion rate by determination of the density was devised.
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