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Published in Soil Sci Soc Am J 16:48-51 (1952)
© 1952 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Moisture Hysteresis in Gypsum Moisture Blocks1

C. B. Tanner and R. J. Hanks2

ABSTRACT

The pressure membrane apparatus was modified by running water between the membrane and the screen plate so that both the drying (release) curve and wetting (intake) curve could be measured in gypsum moisture blocks over the equivalent moisture tension range of 0.0 to 8.4 atmospheres. The difference between release and intake curves, termed moisture hysteresis, for five blocks, was considerable: a block resistance of 6,200 ohms corresponded to any moisture tension from 1.16 to 2.50 atmospheres; a block resistance of 23,000 corresponded to any tension from 2.45 to 4.65 atmospheres; a block resistance of 58,000 corresponded to any tension from 4.70 to 7.40 atmospheres, with all tension ranges depending upon past moisture history. The method appears suitable for measuring hysteresis in gypsum blocks and soils over the entire pressure range to which the pressure membrane apparatus can be operated.

NOTES

1 Contribution from the Department of Soils, University of Wisconsin, Madison, Wis. Published with the permission of the Director of the Wisconsin Agricultural Experiment Station. This work was supported in part by a grant from the Wisconsin Alumni Research Foundation and in part from Research and Marketing Act funds. Appreciation is expressed to the Department of Physics for aid in constructing the apparatus. Presented before Section I, Soil Science Society of America, State College, Pa., August 28, 1951.

2 Assistant Professor of Soils and Assistant in Soils, respectively.






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