Abstract
A comparative laboratory study was conducted to evaluate the durability of two different subgrade soils stabilized with hydrated lime, class C fly ash (CFA) and cement kiln dust (CKD). Cylindrical specimens were compacted at optimum moisture content (OMC) and cured for seven days in a moist room having a constant temperature and controlled humidity. After curing, the specimens were subjected to different wet-dry (W-D) cycles and tested for unconfined compressive strength (UCS) or resilient modulus (M r ). The UCS and M r values after W-D cycling were compared with those of the raw soil specimens to determine the influence of soil and additive type on durability. The UCS and M r values revealed that the addition of cementitious additive increased the durability of stabilized specimens against W-D cycles. The extent of improvement in durability, however, was dependent on the characteristics of both soil and additive and number of W-D cycles.
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