Abstract
AbstractThe potential for chemical incompatibility between soil-bentonite (SB) backfills of vertical cutoff walls composed of conventional (chemically unmodified) sodium bentonite (CSB) and contaminated groundwater has led to evaluation of chemically modified bentonites for improved chemical resistance. Accordingly, the hydraulic conductivity to tap water (kw) and to CaCl2 solutions (kc) of SB backfills amended with a polymerized bentonite known as bentonite polymer nanocomposite (BPN) were measured and compared with those for a traditional backfill composed of CSB. The BPN was used both as a dry amendment and as the constituent in the bentonite slurry. Three backfills were evaluated, viz, clean silica sand amended with either 2 or 5% dry BPN and mixed with 2% BPN slurry (i.e., 2BPN2 and 5BPN2, respectively), and the same sand amended with 5% dry CSB and mixed with 5% CSB slurry (5CSB5). Based on permeation with 50 mM CaCl2, the ratio kc/kw varied in the order of 2BPN2<5CSB5<5BPN2, such that the 5BPN2 bac...
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