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Journal of Geotechnical Engineering

Effect of Different Dosages of Saline Water on the Index and Engineering Properties of Bentonite

  1. VISHWAS KHATRI
  2. Rakesh Kumar Dutta
  3. V Gayathri
  4. Uddayan Pratap Singh

Abstract

The paper presents the effect of different dosages of saline water on the index and engineering properties of bentonite. The various tests conducted were consistency limits, free swell index, compaction and unconfined compressive strength. The saline water solution was prepared by varying the salt content from 5 to 40 gms per litre of distilled water. The specimens were prepared at their maximum dry unit weight and optimum moisture content. The specimens so prepared were cured for 1, 7, 14, 28 days in a sealed plastic bags prior to unconfined compressive strength tests. The results of this study reveal that with an increase in salt content in water added to the bentonite, the plastic limit, liquid limit, plasticity index, free swell index and optimum moisture content decreased and the maximum dry unit weight increased. Beyond a salt content of 20 gm/l, the decrease in the plastic limit, liquid limit, plasticity index, free swell index was marginal. The results further revealed that the unconfined compressive strength increased with increase in salt content in water added to the bentonite but beyond a salt content of 20 gm/l, the increase in the unconfined compressive strength was marginal.
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