Abstract
Dead Sea salt, a benign chemical material vastly available in Jordan, could be used to improve the characteristics of expansive subgrade soil and to reduce carbon dioxide emissions resulting from traditional stabilizers such as cement. To achieve this purpose, expansive clayey soil obtained from Al-Azraq Basin in the eastern part of Jordan was treated by mixing it with a Dead Sea salt solution. Results showed that using Dead Sea salt as a solution additive, the plasticity index (PI), free swell (FS), and optimum moisture content (OMC) decreased. On the other hand, the maximum dry density (MDD) and the unconfined compressive strength (UCS) noticeably increased, continuing to strengthen with increased curing time. Additionally, with wetting-drying cycles to OMC, FS was reduced, reaching equilibrium value with fewer cycles. However, with the wetting-drying cycles to shrinkage limit, FS slightly increased. In conclusion, using Dead Sea salt as a stabilization additive markedly enhanced the engineering properties of the expansive clay used as subgrade soil.
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