圧密試験による瓦用粘土成形体の乾燥変形要因の検討

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When altered granite containing halloysite was mixed with Sekishu roof tile clay mined from the Tsunozu formation in Shimane prefecture, the deformation ratio during drying of these specimens was larger than that for the roof tile clay alone. To clarify the reason for this, three different roof tile clay mixtures were prepared. The first contained altered granite, the second contained altered granite with ground aggregated halloysite, and the third contained separated halloysite (halloysite sieved from altered granite). The three mixtures, together with unmixed roof tile clay, were then extruded using a vacuum kneading machine through an extrusion die that was shifted upward from the center of the machine. The physical properties of the specimens before drying were estimated by consolidation tests based on the Japanese Industrial Standards (JIS). It was found that the specimen containing altered granite with ground aggregated halloysite exhibited a lower expansion index than the specimen containing altered granite alone. The specimen containing separated halloysite, with short acicular halloysite particles in the clay fraction (<5μm), exhibited the lowest expansion index of the three mixtures. The deformation ratio depended on the expansion index, which was affected by swelling of the aggregated halloysite particles in the silt fraction (5-75μm). On the basis of these results, the amount of deformation that is likely to occur during drying of roof tile products can be easily estimated by measuring the expansion index during consolidation tests.
2013-03-28

圧密試験による瓦用粘土成形体の乾燥変形要因の検討

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