Summary
The dew point method, which determines suction by measuring sample temperature and dew point temperature of air equilibrated with the sample, provides a quick and accurate method for measuring suction in the range 1 to 400 MPa (pF 4 to pF 6.6). We present a procedure, using the dew point method, to prepare samples in the relevant suction range, measure suction and water content, and obtain an equation describing the soil water characteristic (SWC). Characteristics for four soil samples ranging in texture from sand to bentonite are presented. All show a linear relationship when water content is plotted vs. logarithm of suction. The slope of the characteristic is easily obtained for use in expansive soil identification.
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References
Campbell GS (1988) Soil water potential measurement: an overview, Irrig Sci 9: 265–273
Campbell GS, Gardner WH (1971) Psychrometric measurement of soil water potential: temperature and bulk density effects, Soil Sci Soc Am Proc 35: 8–12
Gee GW, Campbell MD, Campbell GS, Campbell JH (1992) Rapid measurement of low soil water potentials using a water activity meter. Soil Sci Soc Am J 56: 1068–1070
Gee GW, Ward AL, Zhang ZF, Campbell GS, J Mathison (2002) The influence of hydraulic nonequilibrium on pressure plate data, Vadose Zone J 1:172–178
Greenspan L (1977) Humidity fixed points of binary saturated aqueous solutions, J Res Nat Bureau Stds – A. Physics and chemistry 81A:89–96
Leong E–C, Tripathy S, Rahardjo H (2003) Total suction measurement of unsaturated soils with a device using the chilled-mirror dew-point technique, Geotechnique 53:173–182
Lu N, Likos WJ (2004) Unsaturated Soil Mechanics. Wiley, Hoboken, NJ
McKeen RG (1992) A model for predicting expansive soil behavior. In: 7th Int Conf on Expansive Soils, Dallas, 1:1–6
Rawlins SL, Campbell GS (1986) Water potential: thermocouple psychrometry. In: Methods of Soil Analysis, Part 1, 2nd Ed. Agron Monogr 9:597–618, Madison, WI
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© 2007 Springer-Verlag
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Campbell, G.S., Smith, D.M., Teare, B.L. (2007). Application of a Dew Point Method to Obtain the Soil Water Characteristic. In: Schanz, T. (eds) Experimental Unsaturated Soil Mechanics. Springer Proceedings in Physics, vol 112. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-69873-6_7
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DOI: https://doi.org/10.1007/3-540-69873-6_7
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-69872-2
Online ISBN: 978-3-540-69873-9
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