A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of Freeze-Thaw Cycling on the Hydraulic Conductivity of Soil-Bentonite Mixtures
Soil-bentonite mixtures are often used for liners and covers for waste containment systems in cold regions. In these applications, soil-bentonite mixtures can be exposed to environmental stresses such cycles of freezing and thawing, which can increase the hydraulic conductivity of soil-bentonite mixtures. In this study, hydraulic conductivity tests were conducted to assess how freeze-thaw cycling affects the hydraulic conductivity of a soil-bentonite mixture. The permeating fluids were tap water and fluids containing divalent cations at concentrations representative of naturally occurring field conditions. Results indicate that the hydraulic conductivity of soil-bentonite mixtures can increase by several orders of magnitude as a result of exposure to cycles of freezing and thawing, in the presence of divalent cations. The hydraulic conductivity increase is due to the inability of the bentonite to swell and fill the void spaces in soil-bentonite mixtures. These findings suggest that soil-bentonite mixtures may not be as resistant to damage from freeze-thaw cycling as previously reported by other investigators. Thus, designers and regulators must carefully consider the hydraulic performance of soil-bentonite mixtures in cold regions where they may be exposed to cycles of freezing and thawing.
Effect of Freeze-Thaw Cycling on the Hydraulic Conductivity of Soil-Bentonite Mixtures
Soil-bentonite mixtures are often used for liners and covers for waste containment systems in cold regions. In these applications, soil-bentonite mixtures can be exposed to environmental stresses such cycles of freezing and thawing, which can increase the hydraulic conductivity of soil-bentonite mixtures. In this study, hydraulic conductivity tests were conducted to assess how freeze-thaw cycling affects the hydraulic conductivity of a soil-bentonite mixture. The permeating fluids were tap water and fluids containing divalent cations at concentrations representative of naturally occurring field conditions. Results indicate that the hydraulic conductivity of soil-bentonite mixtures can increase by several orders of magnitude as a result of exposure to cycles of freezing and thawing, in the presence of divalent cations. The hydraulic conductivity increase is due to the inability of the bentonite to swell and fill the void spaces in soil-bentonite mixtures. These findings suggest that soil-bentonite mixtures may not be as resistant to damage from freeze-thaw cycling as previously reported by other investigators. Thus, designers and regulators must carefully consider the hydraulic performance of soil-bentonite mixtures in cold regions where they may be exposed to cycles of freezing and thawing.
Effect of Freeze-Thaw Cycling on the Hydraulic Conductivity of Soil-Bentonite Mixtures
Foose, Gary J. (author) / Thomson, Jr., Robert A. (author)
11th International Conference on Cold Regions Engineering ; 2002 ; Anchorage, Alaska, United States
Cold Regions Engineering ; 938-947
2002-05-08
Conference paper
Electronic Resource
English
Effect of Freeze-Thaw Cycling on the Hydraulic Conductivity of Soil-Bentonite Mixtures
| British Library Conference Proceedings | 2002
Freeze-thaw effect on soil-bentonite mixtures
| British Library Conference Proceedings | 1997
Freeze-Thaw Effects on Hydraulic Conductivity of an Unconfined Soil-Bentonite Cover Material
| British Library Conference Proceedings | 1993
Freeze-Thaw Cycling and Hydraulic Conductivity of Bentonitic Barriers
| Online Contents | 1997
Freeze-Thaw Cycling and Hydraulic Conductivity of Bentonitic Barriers
| British Library Online Contents | 1997