Permeability Investigation of Compacted Bentonite-Treated Lateritic Soil Liner Using a Consolidation Test
doi: 10.14456/mijet.2021.1
Keywords:
Lateritic soil, Bentonite, Compacted clay liner, Permeability, NaCl solutionsAbstract
A traditional permeability (k) test has two main limitations: 1) the test is time consuming (requiring more than 20 days to complete) and 2) material with a very low k value (< 10-9 m/s) cannot be investigated (for example, a constant head test). Therefore, this research introduced an alternative test method using the results of a consolidation test, which measure k values of 10-11 m/s of a compacted lateritic soil-bentonite mixture, and takes only about 7 days to complete the test. The laboratory test results indicated that the k values of the compacted soils were reduced by adding bentonite and that by using a bentonite content of more than 4%, the mixed soils could be used as a compacted clay liner material with a k value less than 10-9 m/s. The effect of cation concentration substantially increased the k values due to the collapse in the thickness of the diffuse double layer. The study results showed that a consolidometer test can be precise in measuring the k value of the compacted clay liner. Moreover, it is important to note that with the bentonite-treated, lateritic soil liner, care is necessary to consider the effect of cations, so the test should be applied considering cations and not only using deionized water, especially in salt-affected areas such as Northeastern Thailand. This research could be a guideline for laboratory investigation of the k value for the evaluation of compacted clay materials.
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