| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Foltz, N. Touze
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2010Quantification of the impact of a synthetic leachate on the structuration of bentonites used in GCLs using rheometrical tests
- 2009On the use of mechanical and hydraulic methods for differenciating between bentonites
- 2009Evaluation of the Viscoelastoplastic Properties of a Clay Material Using a Flow Curve
- 2006Hydraulic and mechanical behavior of GCLs in contact with leachate as part of a composite liner
Places of action
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article
Hydraulic and mechanical behavior of GCLs in contact with leachate as part of a composite liner
Abstract
When a geosynthetic clay liner (GCL) containing sodium bentonite is brought into contact with fluids and soils containing other cations, the latter may exchange with the sodium present between clay layers. This modification of clay surface chemistry may change the clay microstructure and following its mechanical behavior. The influence of cation exchange on the potential for squeezing of bentonite was studied by submitting 10-cm-diameter GCL samples to squeezing tests. Those samples were part of 1-m-diameter GCL specimens that had intentionally been put in contact with leachate during a one year period through the discontinuity in a damaged geomembrane as part of a composite bottom liner, and an underlying soil containing calcium, thus generating cation concentration gradients through the GCL specimens. The impact of the hydration mode of the GCL on flow rate through the composite liner and cation exchange was studied. Results suggests that prehydration by immersion of the GCL with a low ionic strength solution has a positive impact on cation exchange but a detrimental impact on flow rate through the composite liner, as this prehydration was performed without load. Furthermore, an increase in the calcium concentration combined with a decrease in potassium and ammonium concentrations at the surface of clay particles lead to a softening of bentonite resulting in a greater susceptibility to bentonite squeezing in the GCL samples.