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Consolidation and Hydraulic Conductivity of Soil-Bentonite Backfill Containing SHMP-Amended Ca-Bentonite in CCR-Impacted Groundwater
This study presents an assessment of feasibility on using soil-bentonite (SB) cutoff wall to control the migration of coal combustion residual (CCR) impacted groundwater. One-dimensional consolidation tests were conducted on model backfill containing sodium hexametaphosphate (SHMP)-amended calcium bentonite. Both tap water and simulated CCR-impacted groundwater were used to prepare the backfill specimen. Hydraulic conductivities of the specimens calculated from the consolidation results were also evaluated. The results indicated that the compression and swell indices for backfill prepared with CCR-impacted groundwater were 0.15 and 0.009, which was slightly lower than those for backfill prepared with tap water. In contrast, the two backfills possess hydraulic conductivity lower than 10−9 m/s, even under low loading pressure of 24 kPa, with regardless of the solution type used for sample preparation. This indicates little impact of the CCR-impacted groundwater on consolidation and hydraulic conductivity of the tested specimens. Thus the SB wall containing SHMP-amended Ca-bentonite has the potential to be an effective containment system for groundwater in coal ash disposal sites.
Consolidation and Hydraulic Conductivity of Soil-Bentonite Backfill Containing SHMP-Amended Ca-Bentonite in CCR-Impacted Groundwater
This study presents an assessment of feasibility on using soil-bentonite (SB) cutoff wall to control the migration of coal combustion residual (CCR) impacted groundwater. One-dimensional consolidation tests were conducted on model backfill containing sodium hexametaphosphate (SHMP)-amended calcium bentonite. Both tap water and simulated CCR-impacted groundwater were used to prepare the backfill specimen. Hydraulic conductivities of the specimens calculated from the consolidation results were also evaluated. The results indicated that the compression and swell indices for backfill prepared with CCR-impacted groundwater were 0.15 and 0.009, which was slightly lower than those for backfill prepared with tap water. In contrast, the two backfills possess hydraulic conductivity lower than 10−9 m/s, even under low loading pressure of 24 kPa, with regardless of the solution type used for sample preparation. This indicates little impact of the CCR-impacted groundwater on consolidation and hydraulic conductivity of the tested specimens. Thus the SB wall containing SHMP-amended Ca-bentonite has the potential to be an effective containment system for groundwater in coal ash disposal sites.
Consolidation and Hydraulic Conductivity of Soil-Bentonite Backfill Containing SHMP-Amended Ca-Bentonite in CCR-Impacted Groundwater
Lecture Notes in Civil Engineering
Reddy, Krishna R. (editor) / Agnihotri, Arvind K. (editor) / Yukselen-Aksoy, Yeliz (editor) / Dubey, Brajesh K. (editor) / Bansal, Ajay (editor) / Du, Yan-Jun (author) / Reddy, Krishna R. (author) / Yang, Yu-Ling (author) / Fan, Ri-Dong (author)
2020-09-08
8 pages
Article/Chapter (Book)
Electronic Resource
English
Consolidation and Hydraulic Conductivity of Zeolite-Amended Soil-Bentonite Backfills
| British Library Online Contents | 2012
Consolidation and Hydraulic Conductivity of Zeolite-Amended Soil-Bentonite Backfills
Online Contents | 2012
| British Library Conference Proceedings | 2017