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Slump Evaluation of Soil-Bentonite Backfill Amended with Activated Carbon
This paper presents the results of slump tests to evaluate the constructability of a model soil-bentonite (SB) slurry trench cutoff wall backfill comprised of a fine sand and dry sodium bentonite (4% of total solids mass), amended with different amounts of either powdered activated carbon (PAC) or granular activated carbon (GAC) (2, 5, and 10% of total solids mass). The activated carbon (AC) products are added to provide enhanced attenuation capacity of the backfill for miscible organic contaminants. The results indicate that backfill slump at a given water content decreases as the activated carbon content increases. This decrease in slump correlates with an increase in liquid limit of the backfill, suggesting that the activated carbon provides a degree of water adsorption capacity. Thus, a greater water content is necessary for the AC-amended backfills to exhibit a similar slump relative to the control backfill containing no carbon. However, the slump can be adjusted to meet typical field requirements with an appropriate addition of slurry or reduction in dry bentonite amendment, if such a reduction does not compromise the hydraulic conductivity of the backfill.
Slump Evaluation of Soil-Bentonite Backfill Amended with Activated Carbon
This paper presents the results of slump tests to evaluate the constructability of a model soil-bentonite (SB) slurry trench cutoff wall backfill comprised of a fine sand and dry sodium bentonite (4% of total solids mass), amended with different amounts of either powdered activated carbon (PAC) or granular activated carbon (GAC) (2, 5, and 10% of total solids mass). The activated carbon (AC) products are added to provide enhanced attenuation capacity of the backfill for miscible organic contaminants. The results indicate that backfill slump at a given water content decreases as the activated carbon content increases. This decrease in slump correlates with an increase in liquid limit of the backfill, suggesting that the activated carbon provides a degree of water adsorption capacity. Thus, a greater water content is necessary for the AC-amended backfills to exhibit a similar slump relative to the control backfill containing no carbon. However, the slump can be adjusted to meet typical field requirements with an appropriate addition of slurry or reduction in dry bentonite amendment, if such a reduction does not compromise the hydraulic conductivity of the backfill.
Slump Evaluation of Soil-Bentonite Backfill Amended with Activated Carbon
Barben, Edward J. (author) / Malusis, Michael A. (author) / Evans, Jeffrey C. (author)
GeoCongress 2008 ; 2008 ; New Orleans, Louisiana, United States
GeoCongress 2008 ; 636-643
2008-03-07
Conference paper
Electronic Resource
English
Slump Evaluation of Soil-Bentonite Backfill Amended with Activated Carbon
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Hydraulic Conductivity and Compressibility of Soil-Bentonite Backfill Amended with Activated Carbon
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A Miniature Cone for Measuring the Slump of Soil-Bentonite Cutoff Wall Backfill
| Online Contents | 2008
A Miniature Cone for Measuring the Slump of Soil-Bentonite Cutoff Wall Backfill
| British Library Online Contents | 2008