When expansive soils with high sulfate content treated with calcium-rich conventional stabilizers such as lime, cement, and fly ash, excessive swelling and heaving will occur due to the formation of highly expansive ettringite. Therefore, nontraditional chemical stabilizers including ionic soil stabilizers (ISS) are potential alternatives for stabilizing pavements subgrade soils. The objective of this research is to understand the impacts of different ISS dosage levels on the engineering performance of expansive clays located in Texas and Colorado. Atterberg limit tests, standard compaction tests, 1-D swell tests, and unconfined compressive strength (UCS) test of the clay before and after treatment with ISS were carried out. UCS results shows increase of ISS dosage lead to increase of UCS strength and decrease of swell strain.
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