Abstract
A series of laboratory tests was conducted on a tropical residual soil, which is widespread and readily available over a considerable part of Peninsular Malaysia, to assess whether it could be compacted as hydraulic barriers in waste disposal landfills. Index properties, swelling potential, cation exchange capacity (CEC), compaction characteristics, and hydraulic conductivity of the soil indicate that it is inorganic, very plastic, inactive (activity <0.75), moderately expansive (modified free swell index is about 3.06), and of fair attenuation capacity (for inorganic contaminants). For hydraulic conductivity measurement, the soil was compacted in rigid-wall permeameter moulds at a variety of water contents and compactive efforts and then permeated with de-aired tap water. The results of hydraulic conductivity tests illustrate that hydraulic conductivity lower than 1×10−7 cm/s can be achieved using a broad range of water contents and compactive efforts, including water contents dry of optimum. Its shrinkage and strength properties show that it has minimal potential to shrinkage and has adequate strength to support the overburden pressure imposes by the waste body. These findings suggest that the residual soil can be potentially utilized as compacted soil liner material.
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Acknowledgments
This study was supported by the Ministry of Science Technology and Environment of Malaysia, under grant no. IRPA-09–02–02–0156. The authors gratefully acknowledge this contribution.
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Taha, M.R., Kabir, M.H. Tropical residual soil as compacted soil liners. Env Geol 47, 375–381 (2005). https://doi.org/10.1007/s00254-004-1160-7
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DOI: https://doi.org/10.1007/s00254-004-1160-7