This study describes the laboratory evaluation of the effect of freezingthawingcycles on strength and swell potential of fly ash and randomly oriented fiberstabilized expansive soil subbases. Two high plasticity expansive clay soils weremixed with a Class C fly ash and artificial fibers, and then compacted to preparespecimens for all combinations for fly ash contents of 0%, 10%, and 20%, and a fibercontent of 1%. After curing all specimens for seven days, the first set was subjectedto unconfined compression tests, split tensile tests, and vertical swell tests. Similartests were also conducted on another three sets of specimens after being subjected to24 freezing-thawing cycles in a laboratory controlled environment. The freezingthawingcycles significantly decreased the strength and increased the swell potential.However, the fiber inclusion minimized the potential for strength loss and swelling ofexpansive soil due to freezing-thawing cycles.
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