Electro-osmotic and hydraulic flow rates through kaolinite and bentonite clays
- Authors: Jayasekera, Samudra
- Date: 2004
- Type: Text , Journal article
- Relation: Australian Geomechanics Vol. 39, no. 2 (2004), p. 79-86
- Full Text:
- Reviewed:
- Description: The objective of this paper is to discuss the effects of electrokinetics on the rate of flow of water through some low penneable clay soils. Experiments were carried out on test specimens prepared by compacting commerciully available kaolinite and sodium bentonite clays. Using falling head penneability tests, hydraulic conductivity values of these clay soils were determined. Subsequently, the experiments were repeated under different electric gradients to assess the effects of electrokinetics on the rate of flow. The flow characteristics were evaluated using the rate of electrooslllotic flow of water Q, (em'/s), coefficient of electroosmotic penneability k, (cm'lY/s), coetlicient of water transport etliciency k; (cm'/Amp/s). The test results suggest that the rate of flow of water through low penneable clay soils is significantly increased by some orders of magnitude due to the application of a direct current. This flow increase appears to be more pronounced for clays that have lower hydraulic conductivity values. It is noticed that electroosl1lotic penneability is independent ofclay type while the voltage gradienl has minimal effect on electroosmotic rate of flow for the tested clay soils.
- Description: C1
- Description: 2003000716
- Authors: Jayasekera, Samudra
- Date: 2004
- Type: Text , Journal article
- Relation: Australian Geomechanics Vol. 39, no. 2 (2004), p. 79-86
- Full Text:
- Reviewed:
- Description: The objective of this paper is to discuss the effects of electrokinetics on the rate of flow of water through some low penneable clay soils. Experiments were carried out on test specimens prepared by compacting commerciully available kaolinite and sodium bentonite clays. Using falling head penneability tests, hydraulic conductivity values of these clay soils were determined. Subsequently, the experiments were repeated under different electric gradients to assess the effects of electrokinetics on the rate of flow. The flow characteristics were evaluated using the rate of electrooslllotic flow of water Q, (em'/s), coefficient of electroosmotic penneability k, (cm'lY/s), coetlicient of water transport etliciency k; (cm'/Amp/s). The test results suggest that the rate of flow of water through low penneable clay soils is significantly increased by some orders of magnitude due to the application of a direct current. This flow increase appears to be more pronounced for clays that have lower hydraulic conductivity values. It is noticed that electroosl1lotic penneability is independent ofclay type while the voltage gradienl has minimal effect on electroosmotic rate of flow for the tested clay soils.
- Description: C1
- Description: 2003000716
Effects of electrokinetic treatments on the properties of a salt affected soil
- Jayasekera, Samudra, Mewett, John, Hall, Stephen
- Authors: Jayasekera, Samudra , Mewett, John , Hall, Stephen
- Date: 2004
- Type: Text , Journal article
- Relation: Australian Geomechanics Vol. 39, no. 4 (2004), p. 33-46
- Full Text:
- Reviewed:
- Description: This paper presents experimental results of a study undertaken to investigate the effects of electrokinetic treatments on selected chemical and physical properties of a salt contaminated (saline) soil. The study was conducted as a laboratory scale pilot project using locally available saline soil samples. The soil was subjected to an electric gradient by passing a direct current between inserted electrodes. After certain electrokinetic treatment periods, the properties of the soil were evaluated. The experimental data reveals that electrokinetic techniques could offer a low cost. rapid solution to treat saline soils. The removal efficiency of sodium ions was found to be greater than 90% within a relatively short time period of 14 to 30 days, using low current and voltage systems. After 14 to 30 days, the degree of salinity and sodicity decreased to a very low or negligible level. The unconfined compression strength of the soil increased by between 30 % to 100% in 30 days of electrokinetic treatment indicating the improvements in the physical properties, especially in the stress-strain characteristics of the soil. The liquid limit (LL) and plastic limit (PL) increased at the cathode.
- Description: C1
- Description: 2003000726
- Authors: Jayasekera, Samudra , Mewett, John , Hall, Stephen
- Date: 2004
- Type: Text , Journal article
- Relation: Australian Geomechanics Vol. 39, no. 4 (2004), p. 33-46
- Full Text:
- Reviewed:
- Description: This paper presents experimental results of a study undertaken to investigate the effects of electrokinetic treatments on selected chemical and physical properties of a salt contaminated (saline) soil. The study was conducted as a laboratory scale pilot project using locally available saline soil samples. The soil was subjected to an electric gradient by passing a direct current between inserted electrodes. After certain electrokinetic treatment periods, the properties of the soil were evaluated. The experimental data reveals that electrokinetic techniques could offer a low cost. rapid solution to treat saline soils. The removal efficiency of sodium ions was found to be greater than 90% within a relatively short time period of 14 to 30 days, using low current and voltage systems. After 14 to 30 days, the degree of salinity and sodicity decreased to a very low or negligible level. The unconfined compression strength of the soil increased by between 30 % to 100% in 30 days of electrokinetic treatment indicating the improvements in the physical properties, especially in the stress-strain characteristics of the soil. The liquid limit (LL) and plastic limit (PL) increased at the cathode.
- Description: C1
- Description: 2003000726
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