Abstract
The hydraulic conductivity of two compacted lateritic soils was evaluated to determine the suitability for use in landfill liners and covers. Flexible wall permeameter tests were performed on natural specimens and specimens with 2.5 percent and 5 percent bentonite admixture, compacted to different degrees of relative compaction and different water contents. The saturated hydraulic conductivity was determined at confining pressures of 10,50, and 100 kPa; the results indicate that it is necessary to either have confining pressure greater than about 50 kPa or some amount of bentonite admixture to achieve a Ksat less than 1 × 10−9 m/s. At 10 kPa confining pressure, 5 percent bentonite is needed to ensure an adequate range of compaction conditions for which Ksat less than 1 × 10−9 m/s can be achieved. Bentonite mixes relatively easily with the lateritic soil, probably because of its fine-aggregated nature, and we foresee little difficulty in mixing at the field-scale. The susceptibility to shrinkage cracking was qualitatively evaluated by testing swell potential in a variety of ways. It does not appear that shrinkage will be a problem for a well designed and constructed liner or cover of lateritic soil with 5 percent or less bentonite admixture.
Published Version
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