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Compressibility and expansibility of mixtures for Sand Clay Liners

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Document pages: 9 pages

Abstract: The sand clay liner uses expansive clay as filler to occupy the voids in the sand, so as to reduce the hydraulic conductivity of the mixture. In the design of liner and hydraulic barrier, the permeability and transfer of water and other substances through sand clay mixture are the primary consideration. Many successful studies have been carried out to obtain appropriate mixtures that meet the hydraulic conductivity requirements. This study investigated the compressibility and expansibility of the mixture to ensure that it is suitable for light structures, roads and floor slabs. The expansion and compression properties of a series of sand expansive clay mixtures were studied. The expansion and compression index increase with the increase of clay content. The use of highly expansive material can result in large volume changes due to swell and shrinkage. The inclusion of less expansive soil material as partial replacement of bentonite by one-third to two-thirds is found to reduce the compressibility by 60 to 70 for 10 and 15 clay content, respectively. The swelling pressure and swell percent were also found significantly reduced. Adding less expansive natural clay to bentonite can produce liners that are still sufficiently impervious and at the same time less problematic.

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