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Clays and Clay Minerals. Proceedings of the Ninth National by Ada Swineford

By Ada Swineford

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Extra resources for Clays and Clay Minerals. Proceedings of the Ninth National Conference on Clays and Clay Minerals

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The resultant entropy curve is in Fig. 4, and for comparison with the kaolinite entropy the lower pressure range is reproduced in Fig. 3. The remarkable similarity in the (Sa — Si) curves for H-kaolinite and Na-montmorillonite seems to confirm the suspicion that both these clays are contaminated with alumina. Barshad (1960) has investigated some thermodynamic functions for water sorbed on a number of montmorillonites saturated with various exchangeable ions. The preparation procedure was the same as that used by Mooney.

46 N I N T H NATIONAL CONFERENCE ON CLAYS AND CLAY MINERALS permeability decreases with increasing polarity of the permeant. The plots indicate that the Kozeny-Carman equation is obeyed over a considerable void ratio range for all permeants; however, deviations from the K o z e n y Carman relation occur for all permeants because none of the straight lines in Fig. 9 pass through the origin. —Kozeny-Carman coefficient, ^(k0) S, for various fluids through kaolinite beds as a function of void ratio (after Michaels and Lin, 1955).

Therefore, by the use of the water content just before a jump in c-axis spacing, the density calculated from X-ray data should be reliable to within a few percent. As seen in Fig. 1, the agreement between the ρ values calculated from the X-ray data of Norrish and the ρ values of Low show very satisfactory agreement. Méring (1946) did not observe the T A B L E 3 . — D E N S I T Y OF A D S O R B E D W A T E R CALCULATED FROM X - R A Y D A T A Experimental Data ^00/ (Â) Mooney et al. 99- See t e x t for method of computation.

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