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Experimental study of the electrokinetic behaviour of kaolinite–smectite mixtures

Abstract : The evolution of the behaviour of kaolinite–smectite mixtures was studied using mechanical and electrokinetic tests. Oedometric tests showed that the compression index of the mixtures increases with increasing smectite percentage and that the curves feature a double slope in the [log σv,e] (where σv is the vertical mechanical stress and e is the void ratio) coordinate system when the percentage of smectite is strictly higher than 25%. Electrokinetic tests show that, of smectite the electrical conductivity and electro-osmotic flow tend towards that of the smectite. Measurements performed after the electrokinetic tests showed that the pH and conductivity are constant when the amount of smectite is lower than 25%. For higher smectite content, acidification of the medium is not totally obtained and the electrical conductivity is higher near the anode because of the slow diffusion of H+ ions in the structure. The tests also highlight that the electro-osmotic permeability is affected by the hydraulic permeability, although the variation in electro-osmotic permeability remains small compared with that of hydraulic permeability.
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Submitted on : Sunday, June 6, 2021 - 8:45:01 PM
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M. Ben Salah, H. Souli, P. Dubujet, M. Hattab, M. Trabelsi Ayadi. Experimental study of the electrokinetic behaviour of kaolinite–smectite mixtures. Soil Research, 2017, 55 (8), pp.743-749. ⟨10.1071/SR16267⟩. ⟨hal-03251247⟩



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