381-17The Relationship Between Salt Concentration and Thermal Properties of Clayey Soils.

See more from this Division: S01 Soil Physics
See more from this Session: Soil Physics and Hydrology Posters: II
Wednesday, October 24, 2012
Duke Energy Convention Center, Exhibit Hall AB, Level 1

Shinsuke Aoki, Graduate School of agriculture, Meiji University, kawasaki, Japan and Kosuke Noborio, Department of Agriculture, School of Agriculture, Meiji University, Kawasaki, Japan
Clayey soils may be used as the most-outer barrier placed at the outside of containers with waste disposals in a geological disposal site. These waste disposals often contain salt solutions. In some cases, the leakage of salt solutions may generate heat by hydration. To give a complete view of a barrier material, it is necessary to understand the effect of water content and salt solution concentration on soil thermal properties. The purpose of our research was to investigate salt-dependent thermal properties of clayey soils. A swelling montmorillonitic soil and a non-swelling kaolinitic soil were used. Solutions of NaCl, Na2SO4 and CaCl2 were prepared with a concentration change between 0 and 1 mol/kg. Soil was mixed with the predetermined concentration of a salt for various solution contents of the soil. The mixed soil was packed in an acrylic column, and equilibrated to the room temperature (20℃). A three-wire thermo-time domain reflectometry (TDR) probe (0.040m long, 0.0075m spacing, Nichrome heater wire encased in the central rod and type T thermocouples in the rods of both ends) was used for measurements. Thermal properties were determined with a dual-probe heat-pulse technique. The results will be discussed.
See more from this Division: S01 Soil Physics
See more from this Session: Soil Physics and Hydrology Posters: II