Diffusion through soil-bentonite backfill from a constructed vertical cutoff wall
| Autor: | Michael A. Malusis, Kristin M. Sample-Lord, Mustaki Ahmed |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Sodium Bentonite 021110 strategic defence & security studies Materials science Base (chemistry) Diffusion 0211 other engineering and technologies Analytical chemistry 02 engineering and technology Geotechnical Engineering and Engineering Geology Chloride chemistry Bentonite Slurry medicine Cutoff Leaching (agriculture) 021101 geological & geomatics engineering Civil and Structural Engineering medicine.drug |
| Zdroj: | Soils and Foundations. 61:429-443 |
| ISSN: | 0038-0806 |
| DOI: | 10.1016/j.sandf.2021.01.002 |
| Popis: | Diffusion coefficients were measured for soil-bentonite (SB) backfill sampled from a constructed vertical cutoff wall in Pennsylvania, USA. The backfill consisted of lean clay (the base soil) combined with bentonite-water slurry containing 5–6% sodium bentonite, resulting in a total bentonite content of ~1%. Ten dialysis leaching tests (DLTs) were conducted to measure apparent diffusion coefficients (Da) for chloride (Cl−) diffusion through the lean clay-bentonite backfill. In addition, model sand-bentonite backfills (total bentonite content = 4.7%) were prepared in the laboratory, and eight DLTs were performed for comparison with the field-sampled backfill and the diffusion literature. Both backfill types were tested with monovalent and divalent salt solutions (KCl and CaCl2), over a wide range of concentrations (60–350 mM). Despite the difference in bentonite content, values of Da were similar for the two backfills. Changes in Da with increasing average Cl− concentration were relatively minor, increasing by less than half an order of magnitude over the wide range of salt solutions, likely due to the low percentages of bentonite ( |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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