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A platform for research: civil engineering, architecture and urbanism
Unsaturated Soil Moisture Diffusivity Measurements in Laboratory Using Thermocouple Psychrometers
The performance of civil structures constructed on unstable or expansive unsaturated soils can be critically affected by moisture movement through these soils. The unsaturated diffusivity coefficient controls transient moisture flow conditions within a soil in response to total suctions or fluxes imposed at the boundaries of the soil profile. This study adopts and analyzes an approach originally developed by Peter Mitchell for laboratory unsaturated soil diffusion coefficient measurements. The diffusivity coefficients are determined by measuring total suction profiles over time in cylindrical soil specimens. Mitchell's methodology for evaluating the soil moisture diffusion characteristics is simple, economical, and accurate hence it can be used on a routine basis in a geotechnical laboratory. The paper presents diffusivity measurements of high plasticity clays exposed to a relatively constant low relative humidity environment in laboratory. The possible effect of soil sample lengths in determining accurate estimates of moisture diffusivity is also presented.
Unsaturated Soil Moisture Diffusivity Measurements in Laboratory Using Thermocouple Psychrometers
The performance of civil structures constructed on unstable or expansive unsaturated soils can be critically affected by moisture movement through these soils. The unsaturated diffusivity coefficient controls transient moisture flow conditions within a soil in response to total suctions or fluxes imposed at the boundaries of the soil profile. This study adopts and analyzes an approach originally developed by Peter Mitchell for laboratory unsaturated soil diffusion coefficient measurements. The diffusivity coefficients are determined by measuring total suction profiles over time in cylindrical soil specimens. Mitchell's methodology for evaluating the soil moisture diffusion characteristics is simple, economical, and accurate hence it can be used on a routine basis in a geotechnical laboratory. The paper presents diffusivity measurements of high plasticity clays exposed to a relatively constant low relative humidity environment in laboratory. The possible effect of soil sample lengths in determining accurate estimates of moisture diffusivity is also presented.
Unsaturated Soil Moisture Diffusivity Measurements in Laboratory Using Thermocouple Psychrometers
Mabirizi, Daniel (author) / Bulut, Rifat (author)
International Foundation Congress and Equipment Expo 2009 ; 2009 ; Orlando, Florida, United States
2009-03-10
Conference paper
Electronic Resource
English
Unsaturated Soil Moisture Diffusivity Measurements in Laboratory Using Thermocouple Psychrometers
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