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Unsaturated soil moisture drying and wetting diffusion coefficient measurements in laboratory

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Okla State Agency	Transportation Center, Oklahoma
Okla Agency Code	'OKT'
Title	Unsaturated soil moisture drying and wetting diffusion coefficient measurements in laboratory
Authors	Mabirizi, Daniel. Bulut, Rifat. Oklahoma State University. Civil & Environmental Engineering. Oklahoma Transportation Center.
Publisher	Oklahoma Transportation Center
Publication Date	2009-09
Publication type	Technical Reports
Subject	Soil moisture--Measurement. Soil suction. Moisture content.
Purpose	Transient moisture flow in an unsaturated soil in response to suction changes is controlled by the unsaturated moisture diffusion coefficient. The moisture diffusion coefficient can be determined by measuring suction profiles over time. The laboratory testing approach involves measurement of the total suction changes with time using thermocouple psychrometers in cylindrical soil specimens with predetermined boundary conditions. The determination of the diffusion coefficient by this method is simple and relatively rapid and can be carried out on a routine basis in a geotechnical engineering laboratory. It is well-known that soils exhibit hysteresis with drying and wetting cycles. A similar hysteresis has been observed between the drying and wetting diffusion parameters for a number of undisturbed soil samples obtained from field borings across Oklahoma. The wetting diffusion coefficients are generally greater than the drying diffusion coefficients by a factor of up to 2.; The primary objectives of this project were (i) to develop an improved and unified testing protocol for measuring both the drying wetting diffusivity parameters on the same soil specimens; (ii) to improve the current testing equipment to perform both the drying test and wetting test; and (iii) to evaluate the hysteresis effect on the drying and wetting diffusion parameters.
Notes	OTCREOS7.1-11-F
OkDocs Class#	Z2285.8 U59s 2009
Digital Format	PDF, Adobe Reader required
ODL electronic copy	Downloaded from agency website: http://www.oktc.org/otc/files/finalReports/OTCREOS7.1-11-F.pdf
Rights and Permissions	This Oklahoma state government publication is provided for educational purposes under U.S. copyright law. Other usage requires permission of copyright holders.
Language	English
Date created	2013-03-18
Date modified	2013-03-19

Title	OTCREOS7.1-11-F 1
Full text	ECONOMICENHANCEMENTTHROUGHINFRASTRUCTURESTEWARDSHIP UNSATURATED SOIL MOISTURE DRYING AND WETTING DIFFUSION COEFFICIENT MEASUREMENTS IN THE LABORATORY DANIEL MABIRIZI RIFAT BULUT, PH.D. OTCREOS7.1-11-F Oklahoma Transportation Center 2601 Liberty Parkway, Suite 110 Midwest City, Oklahoma 73110 Phone: 405.732.6580 Fax: 405.732.6586 www.oktc.org
Date created	2013-03-18
Date modified	2013-03-18

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