Abstract
AbstractThe potential for incompatibility between soil-bentonite (SB) backfills of vertical cutoff walls composed of conventional sodium bentonite (CSB) and contaminated groundwater has led to the evaluation of chemically modified bentonites for improved chemical resistance. In addition, the stress conditions and consolidation behavior represent important considerations with respect to the performance of SB vertical cutoff walls. Accordingly, the consolidation behavior of SB backfills amended with a polymerized bentonite known as bentonite polymer nanocomposite (BPN) were evaluated and compared with those for a backfill composed of CSB. The three backfills that were evaluated included 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). The 5BPN2 backfill displayed bisemilog linear stress-strain behavior and was more sensitive to stress conditions than either...
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