Abstract
ABSTRACT Influence of concentrations of lead (Pb2+) on consolidation behaviour of bentonite was investigated. Various parameters such as coefficient of consolidation (cv ), coefficient of volume change (mv ), time for 90% of consolidation (t90) and compression index (Cc ) and Swelling potential and swelling pressure in the presence of the various lead concentration ranging from 250 to 1000 mg/L. The results manifested that with the increase in lead concentration, the swelling pressure, swelling potential and cv increased; however, Cc, mv and t90 of the bentonite decreased. A decrease in diffuse double layer (DDL) thickness as the Pb2+ gets adsorbed by bentonite is responsible for the change in these parameters. The results show that the impact of Pb2+ on bentonite was more dominant at higher concentration. Results also revealed that with the rise in vertical consolidation pressure, t90 increased, whereas cv decreased. However, mv increased initially and then decreased after reaching a peak value.
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