Properties of geotextiles in cold regions applications Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/q237hv44z

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  • Geotextiles are experiencing increased use in arctic and subarctic construction in separation, reinforcement, erosion control, and drainage applications. The use of geotextiles as capillary cutoff layers to prevent frost heave has been proposed as well. In recognition of the need to investigate properties of geotextiles in cold regions applications, a laboratory test program was conducted with five representative geotextile types. Freeze-thaw durability of geotextiles in fresh and saline water was studied. Geotextile strength before and after 300 freeze-thaw cycles showed no serious degradation. Geotextile load-deformation-time relationships were determined at +22 °C and -12°C by wide strip tensile and static creep tests. Temperature had little effect on strength, but creep was significantly affected. Lower temperatures resulted in lower creep rates and delayed the onset of tertiary creep. Geotextile structure and polymer type were significant to creep. Polypropylene geotextiles were affected to a greater extent by the temperature differences considered than were polyester geotextiles. A preliminary laboratory investigation was-performed to determine the potential of geotextiles to serve as capillary breaks to reduce frost heave. Three columns of a highly frost susceptible Alaskan silt were frozen simultaneously from the top at a constant rate. Free water was available at the bottom for two columns - one contained a geotextile layer and one did not. The third column, a control specimen, was frozen without free water or a geotextile layer. Heave and water content increase during freezing were determined for each soil column. The results indicate select geotextiles have the potential to significantly reduce frost heave. There were substantial differences between the effectiveness of the five geotextiles considered.
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