Freeze-Thaw Effect on Permeability of Polyurethane-Reinforced Sand in Uniform Triaxial Compression
T. V. Shilova
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: soft sandy rock, polymer reinforcement, polyurethane resin, mixing, injection, freeze, thaw, lab-scale investigations, electron microscopy, permeability test, permeability
Abstract
The article describes the lab test data on the structure and permeability of sand reinforced with elastic polyurethane. The electron microscopy reveals the spatial patterns of hard polyurethane, voids and mineral particles in reinforced sand. The permeability of the test samples is investigated under conditions of uniform triaxial compression. The response of permeability of reinforced rock to freeze-thaw is analyzed depending on moisture content, specific consumption of chemical reagents and reinforcement method. The stability values of the insulating properties of sand are compared for the cases of sand reinforcement by its mixing with polyurethane resin and through creation of a low-permeable inclusion (injection simulation). The advantage of injection over mixing is shown-the consumption of polymer composition is lower and the stability to seasonal temperature fluctuations is higher.
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