Stabilization of expansive soils using ionic stabilizer

摘要

In many parts of the USA, expansive soils pose a significant hazard to infrastructures. These kinds of soils owe their characteristics to the presence of swelling clay minerals. As they get wet, they swell; conversely, as they dry, they shrink. Many stabilization methods have been developed to mitigate the adverse effects of expansive soil. One of them is the use of the ionic additive. In this research, a liquid ionic product is evaluated as a non-traditional stabilizer. Soil samples from a specific construction site in Texas and soil samples from Oklahoma were utilized. The evaluation tests involve the suction measurements, swelling, and plasticity index for treated and untreated soils. Cyclic swelling tests were also carried out on reconstituted specimens. From laboratory tests and analysis, it was found that this additive is effective in reducing swelling of both Texas and Oklahoma soils. It reduces swelling of Texas soils by 0.4-6% and Oklahoma soil by 2-7.4%. The results of swelling cycles reveal a permanent effect of this stabilizer on mitigating the swelling behavior. After the 3(rd) swelling cycle, the swelling for Oklahoma soils was 5.58% lower than the natural soil, and for Texas soils, it was reduced by 6.02-8.49% for different concentrations of the additive. However, no definitive trend was observed for reducing the shrinkage potential.