• Journal of the Korean Geotechnical Society
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• v.26 no.5
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• pp.27-36
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• 2010

Thermal conductivities using the thermal probe method were determined for frost susceptible soil with three types of discarded tire powder under the condition of a temperature variation from $-20^{\circ}C{\sim}+10^{\circ}C$. Also, the amount of unfrozen water contents was measured by the pulsed NMR method. The variation of unfrozen water content in the experimental condition could be expressed as a function of temperature given by an exponential equation. A new model for calculating the thermal conductivity of frozen soil was proposed. It is extended from the two element method and subdivided into three constituent elements.

• Journal of the Korean Geotechnical Society
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• v.26 no.4
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• pp.15-26
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• 2010

To determine the frost heave suppressing mechanism of soil mixed with tire powder, we conducted three kinds of laboratory experiments: measurement of unfrozen water, evaluation of thermal conductivity, and a frost heave. In this research, we focused on changes in the coefficient of permeability of the mixed soil, and first found that of the unsaturated soil. Next, in the case of the presence of ice, we took the ice-impeding factor into consideration to derive the coefficient of permeability of the frozen fringe from the area ratio of the soil and tire powder in mixed soil. The results show a positive correlation between the water intake rate and the coefficient of permeability. Moreover, we found that the frost heave decreased thanks to a reduction in the permeability and a fall in the unfrozen water content of the soil mixed with tire powder. We also calculated the weight of the water content of the soil and tire powder void quantitatively using the result of the volumetric ratio of mixed soil.