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Study on permeability of reinforced sand with polyurethane soil stabilizer

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Document pages: 14 pages

Abstract: The polymer material of polyurethane soil stabilizer (PSS) was used to strengthen the sand. In order to understand the permeability characteristics of PSS reinforced sand, a series of reinforcement layer morphology tests, single hole permeability tests and multi hole permeability tests were carried out. The enhancement mechanism was discussed by SEM images. The results show that the impermeability of sand reinforced with polyurethane soil stabilizer is improved by forming a reinforcement layer on the surface of sand. With the increase of curing time and PSS concentration, the thickness and integrity of reinforcement layer increase. The water flow rate decreased with the increase of curing time or PSS concentration. Permbility coefficient decreases with the increasing of curing time and PSS concentration and increases with the increasing of depth in specimen. PSS fills up the voids of sand and adsorbs on the surface of sand particle to reduce or block the flowing channels of water to improve the permeability resistance of sand. The results can be applied as the reference for chemical reinforcement sandy soil engineering, especially for surface protection of embankment, slope, and landfill.

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