@phdthesis{oai:kitami-it.repo.nii.ac.jp:00007529,
 author = {金, 學三 and Kim, Hak-Sam},
 month = {2016-11-22},
 note = {Recently big building projects have increased the demand for crushed stone and gravel but they are hard to secure granular material of fine quality because the government’s strict policies of environment and natural conservation have made developing stony mountains difficult.
This study, aiming at positive, effective use of discarded tire powder as soil material, instead of granular material of good quality in want, conducted a field experiment on the nonmixed and mixed soil (mixing ratio of tire powder 20%) in a concrete basin in order to investigate the effect of tire powder on inhibiting frost heave as the first step of the research. 
At the field experiment, frost heave amount, frozen depth, frost heave force, soil temperature, ground water level, etc. were observed. Also the frost heave suppressing effect of tire powder was evaluated quantitatively based on frost heave ratio and segregation potential. As the second step of the study, tests of thermal conductivity, unfrozen water, ultrasonic wave and laboratory frost heave, etc. were carried out on the mixed soil of discarded tire to investigate its engineering characteristics.
First, test of thermal conductivity was carried out to analyze the thermal conductivity behavior according to temperature variance and mixing ratio using discarded tire powder of
three different kinds in particle diameter. Besides, using pulsed Nuclear Magnetic Resonance (NMR) equipment, unfrozen water content of frozen soil was measured and expressed into the function of temperature. Also, by developing two-phase thermal conductivity model of soil particle and water for unfrozen soil proposed by Woodside, a new three-phase thermal conductivity model was proposed, consisting of soil particle, ice and unfrozen water, that can be applied even to the area of frozen soil.
For ultrasonic wave test, using pulse method, a kind of nondestructive method that can evaluate dynamic characteristics of frozen soil, behavior of P wave (dilatational wave) and S wave (shear wave) of frozen soil was analyzed according to the change of -10 degree Celsius to 0 degree Celsius and mixing ratio of discarded tire powder, and unconfined compressive test was conducted on four kinds of mixed soil from discarded tire powder. Also, change in unfrozen water of frozen soil mixed with discarded tire powder was analyzed, and the relationships between unfrozen water content and elastic wave velocity as well as between elastic wave velocity and unconfined compressive strength were examined. In addition, using the measures of elastic wave velocity, against frozen soil mixed with tire powder, elastic constant, dynamic shear modulus, dynamic elastic modulus and Poisson’s ratio were calculated.
In frost-heave experiment, aiming to examine the frost heave characteristics of mixed-soil according to the change of mixing ratio of discarded tire powder and to investigate the related frost heave suppressing mechanism, the author, based on the idea of change in coefficient of permeability by the mixture of discarded tire powder, first calculated unsaturated coefficient of permeability from the relationship between unfrozen water content in the low temperature below 0 degree Celsius and unsaturated water content in the normal temperature above 0 degree Celsius. Then, after considering the ice-impeding factor and ratio between the cross sections of soil and tire powder in the mixed soil, effect of tire powder reducing frost susceptibility was systemically investigated through calculating the permeability coefficient of frozen fringe.},
 school = {北見工業大学},
 title = {Study on Engineering Properties of Soil Mixed with Discarded Tire Powder},
 year = {}
}