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Hydraulic conductivity and multi-scale pore structure of polymer-enhanced geosynthetic clay liners permeated with bauxite liquors
Abstract A study was conducted to investigate the multi-scale pore structure-based mechanism controlling the hydraulic conductivity of polymer-enhanced geosynthetic clay liners (GCLs) prepared by the wet-mixed method to bauxite liquors (BLS and BLA). The multi-scale pore structures were evaluated using MIP and N2GA tests quantitatively. Conventional GCL permeated with BLS had a larger flow path volume than with DI water (0.194 > 0.119 cm³/g), attributed to the bentonite swelling inhibition and the montmorillonite dissolution, leading to the higher hydraulic conductivity (3.0 × 10−7 > 2.7 × 10−11 m/s). Polymer-enhanced GCLs developed more micropores and had a smaller quantity proportion and volume of flow paths since polymer formed more micropores to clog pores, contributing to a lower hydraulic conductivity than conventional GCL to BLS. The hydraulic conductivity of polymer-enhanced GCL to BLS (ionic strength: 622.5 mM) was higher than that to BLA (156.9 mM) (2.6 × 10−9 > 6.0 × 10−12 m/s), given that the coiled or contracted polymer conformation left a smaller quantity proportion (5.54% < 6.71%) and volume (0.0002 cm3/g < 0.0035 cm3/g) of micropores.
Graphical abstract Display Omitted
Highlights This study evaluated the multi-scale pore structures of GCLs by combining MIP and N2GA tests. Conventional GCL had higher hydraulic conductivity to bauxite liquors because of wider flow paths. The polymer formed micropores to clog pores, leading to narrower flow paths and lower hydraulic conductivity. The higher ionic strength affected micropores by changing polymer conformation, resulting in higher hydraulic conductivity. GCLs with higher polymer loading had lower hydraulic conductivity since sufficient polymers created more micropores.
Hydraulic conductivity and multi-scale pore structure of polymer-enhanced geosynthetic clay liners permeated with bauxite liquors
Abstract A study was conducted to investigate the multi-scale pore structure-based mechanism controlling the hydraulic conductivity of polymer-enhanced geosynthetic clay liners (GCLs) prepared by the wet-mixed method to bauxite liquors (BLS and BLA). The multi-scale pore structures were evaluated using MIP and N2GA tests quantitatively. Conventional GCL permeated with BLS had a larger flow path volume than with DI water (0.194 > 0.119 cm³/g), attributed to the bentonite swelling inhibition and the montmorillonite dissolution, leading to the higher hydraulic conductivity (3.0 × 10−7 > 2.7 × 10−11 m/s). Polymer-enhanced GCLs developed more micropores and had a smaller quantity proportion and volume of flow paths since polymer formed more micropores to clog pores, contributing to a lower hydraulic conductivity than conventional GCL to BLS. The hydraulic conductivity of polymer-enhanced GCL to BLS (ionic strength: 622.5 mM) was higher than that to BLA (156.9 mM) (2.6 × 10−9 > 6.0 × 10−12 m/s), given that the coiled or contracted polymer conformation left a smaller quantity proportion (5.54% < 6.71%) and volume (0.0002 cm3/g < 0.0035 cm3/g) of micropores.
Graphical abstract Display Omitted
Highlights This study evaluated the multi-scale pore structures of GCLs by combining MIP and N2GA tests. Conventional GCL had higher hydraulic conductivity to bauxite liquors because of wider flow paths. The polymer formed micropores to clog pores, leading to narrower flow paths and lower hydraulic conductivity. The higher ionic strength affected micropores by changing polymer conformation, resulting in higher hydraulic conductivity. GCLs with higher polymer loading had lower hydraulic conductivity since sufficient polymers created more micropores.
Hydraulic conductivity and multi-scale pore structure of polymer-enhanced geosynthetic clay liners permeated with bauxite liquors
Chen, Xing (author) / Tan, Yu (author) / Chen, Jiannan (author) / Peng, Daoping (author) / Huang, Tao (author) / Meng, Chunxiao (author)
Geotextiles and Geomembranes ; 52 ; 46-58
2023-09-05
13 pages
Article (Journal)
Electronic Resource
English
Hydraulic conductivity of two geosynthetic clay liners permeated with a hyperalkaline solution
| Online Contents | 2010