The design criteria were introduced in this paper to design a landfill cover barrier layer using theudcompacted soil-fiber mixture for the future application (i.e. park, residential, etc.). Polypropylene (C3H6) fiber was usedudas an additive material for soil samples. The soil specimens compacted under the conditions of maximum dry densityudand optimum water content. In this study, the design objective in using the compacted soil-fiber mixture is to determineudthe range of fiber content (i.e. 0.0% - 1.2%) within which the soil specimens will have adequate compactionudcharacteristics, compressive and tensile strength, minimum amount of cracking, and low hydraulic conductivity. It isudfound that the fiber content that maximized the maximum dry density was considered insignificant. Fiber content inudexcess of 0.8% showed significant increase in the unconfined compressive strength. The tensile strength significantlyudincreased for soil specimens exceeding 0.2% of fiber content. An acceptable limiting value of the crack intensity factorudto prevent desiccation cracking for soil specimen was found between 0.6 and 0.8% of fiber content. Moreover, the fiberudcontents up to 1.2% maintained the hydraulic conductivity within acceptable levels. As a result, the optimum fiberudcontent that was necessary to meet the overall acceptable zones based on the parameter design investigated in this studyudwas found and reported in this study.
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