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Comparison of short-term and long-term performances for polymer-stabilized sand and clay

Journal of traffic and transportation Engineering(English Edition) 2017年第2期4卷 145-155页

作者： Sepehr Rezaeimalek Abdolreza Nasouri Jie Huang Sazzad Bin-Shafique simon t.gilazghi Department of Civil and Environmental Engineering The University of Texas at San AntonioSan AntonioTX78249USA texas Department of transportation AustinTX 78701USA

A series of tests were carried out on sulfate rich, high-plasticity clay and poorly-graded natural sand to study the effectiveness of a methylene diphenyl diisocyanate based liquid polymer soil stabilizer in improving the unconfined compressive strength （UCS） of freshly stabilized soils and aged sand specimens. the aged specimens were prepared by exposing the specimens to ultraviolet radiation, freeze-thaw, and wet-dry weathering. the polymer soil stabilizer also mitigated the swelling of the expansive clay. For clay, the observations indicated that the sequence of adding water and liquid polymer had great influence on the gained UGS of stabilized specimens. However, this was shown to be of little importance for sand. Furthermore, sand samples showed incremental gains in UCS when they were submerged in water. this increase was significant for up to 4 days of soaking in water after 4 days of ambient air curing. Conversely, the clay samples lost a large fraction of their UCS when soaked in water; however, their remaining strength was still considerable. the stabilized specimens showed acceptable endurance under weathering action, although sample yellowing due to ultraviolet radiation was evident on the surface of the specimens. Except for moisture susceptibility of the clay specimens, the results of this study suggested the liquid stabilizer could be successfully utilized to provide acceptable strength, durability and mitigated swelling.

关键词： Soil stabilization Liquid polymer Sand Expansive clay Unconhned compressive strength

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