著者

近藤 連一 大門 正機 大沢 栄也

出版者

無機マテリアル学会

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1971, no.112, pp.92-96, 1971-05-01 (Released:2011-03-07)

参考文献数

12

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The equations showing the relationship between the rate of water absorption and the pore size of porous materials were studied in connection with the water absorption phenomena in consideration of the various capillary models and also new equations were tentatively derived.The water absorption experiments were done by using hydrated α and β-CaSO4·1/2 H2O for examples and the previonsly mentioned equations were applied to the results and some discussions were made. The electrical resistance which changes with absorption of the ionic solution into the specimen was measured for the calculation of the through pore size distribution.The results showed that in the case of β-CaSO4·1/2 H2O, the varying radius capillary model in which each capillary has various radius was in good accordance with the structure estimated by the mercury penetration method and the scanning electron microscope observation. While, the pore size distribution of α-CaSO4·1/2 H2O showed good accordance with the meandering capillary model rather than that with the varying radius model. The straight capillary model might be in general inadequate. These facts seem to indicate that the tortuosity is related with either the variation of radius in each capillary or the meandering of each capillary, varying with the sort of specimen.It was found that the method to measure the rate of water absorption is valuable to study the pore structure of the materials.