2013 Volume 124 Pages 11-16
Thermal properties of sands with different par-ticle size and shape were measured. All sands showed the similar trend for the change in heat capacity, increas-ing with increasing in water content (θ).The gradient of the thermal conductivity (λ) to θ under the dry region (θ < 0.05 〜0.10) increased with increasing particle size for sands with rough shape, indicating an increase in con-tact points per soil particle highly enhanced thermal con-duction. Oppositely, for the wet region (θ > 0.05 〜0.10), the gradient of λ to 0 were similar for sands with different particle size. Equations of λ at completely dry condition and water saturation were derived from obtained relation-ships between quartz content and Z in this study. By in-serting these equations, existing models for thermal con-ductivity were modified, which markedly improved model performances.
