Characterization of unsaturated particulate materials using elastic and electromagnetic waves

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Soils are particulate and multi-phase materials(i.e., air, fluid, solid) thus, their properties capture the interation among district phases.In unsaturated particulate materials, the negative pore-water pressure in menisci at particle contacts increases the interparticle forces, changes the small-strain stiffness, and alters all forms of conduction and diffusion processes. It has been difficult in evaluation such effects in common geotechnical engineering practices. A drying cell is newly developed to assess the characteristics of unsaturated particulate materials with the aid of elastic and electromagnetic waves. Bender elements(i.e., dimorphs) are installed at the center of metal caps and insulated from unwanted electromagnetic fields, while the metal caps work as electrodes. This configuration allows acquiring elastic and electromagnetic properties simultaneously. Continuous monitoring measurements are performed in laboratory specimens made of three different soils. Overall, experimental test results suggest that unsaturated particulate materials can be assessed effectively using the developed cell with the aid of elastic and electrmagnetic waves.
Publisher
APCNDT
Issue Date
2003
Keywords

Capillarity; conduction; drying cell; elastic wave; electromagnetic wave; shear wave velocity; small strain stiffness; unsaturated particulate material

Citation

11th APCNDT 2003, pp.313

URI
http://hdl.handle.net/10203/9803
Appears in Collection
CE-Conference Papers(학술회의논문)

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