Abstract
Some clayey soils are generally classified as expansive soils which cause extensive damage to civil engineering structures due to change in its water content and the amount and type of clay size particles. Other important factors affecting the expansion behavior include the amount of non-expansive materials. This paper based on comparing two solutions to improve the soil parameters: the first solution to improve the soil with steel fiber and the second solution to improve the soil strength and volume changes with plastic waste material. Various tests conducted to study the effect of using different percentages of steel fiber and plastic waste material (4%, 8% and 12%) for each additives by dry weight of soil. The results presents that the steel fiber and plastic waste material significantly improved the soil strength and volume changes besides the physical properties of expansive clay soil which have susceptibility of swelling.
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