Unsaturated behaviour and cation self-diffusion of geosynthetic clay liners in Antarctica
| Autor: | A.S. Acikel, R. K. Rowe, R.S. McWatters |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Geosynthetic clay liner
021105 building & construction 0211 other engineering and technologies medicine Geotechnical engineering 02 engineering and technology Geosynthetics medicine.symptom Geotechnical Engineering and Engineering Geology Geology 021101 geological & geomatics engineering Civil and Structural Engineering Water retention |
| Zdroj: | Geosynthetics International. 28:350-367 |
| ISSN: | 1751-7613 1072-6349 |
| DOI: | 10.1680/jgein.20.00048 |
| Popis: | The impact of time-dependent unsaturated behaviour of virgin and the impact of cation self-diffusion on the time-dependent unsaturated behaviour of exhumed geosynthetic clay liner (GCL) specimens were investigated using a chilled mirror hygrometer. Total suction values (after 7 weeks’ water homogenisation) are reported for ten virgin (six different bentonites) and one GCL exhumed after exposure to the thermo-hydro-mechanical (THM) conditions in Antarctica. The time-dependent unsaturated responses of four different virgin GCLs 1 day and 1 week after hydration are compared with the results at homogenisation and the implications discussed. For the suction (0.1–300 MPa) and water content range (5–140%) examined, the post-water homogenisation water retention behaviour of the GCLs is affected by bentonite characteristics. At a given gravimetric water content, the total suction of GCLs increased with increasing smectite content and total soluble salt content and decreased with increasing total bound cation content in the bentonite. Cation self-diffusion also increased the total suction in the GCL exhumed after exposure to Antarctic THM conditions. It is concluded that the impact of cation self-diffusion on the unsaturated behaviour of a GCL during its time in service before exposure to pollutants needs to be considered in designing hydraulic and gas barriers. |
| Databáze: | OpenAIRE |
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