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Electrokinetics to deal with salinity impacts on urban and rural infrastructure : a laboratory investigation
conference contributionposted on 2017-12-06, 00:00 authored by S Jayasekera
In this project, an in-situ soil treatment technique based on electrokinetics was tested in order to identify the potential of this approach to modify the engineering properties of salt affected soils. Two soils, a clay and a silty loam, collected from salt affected regions in central Victoria, Australia, were compacted in glass tanks in the laboratory to represent in-situ field density and in-situ water content. Using electrodes inserted into the soil, a direct current was passed across the soil under a voltage gradient of 0.5 V/cm for a period of 20 days. The results showed that after electrokinetic processing soil sodicity (measured as ESP - Exchangeable Sodium Percentage) decreased by 90%. The liquid and plastic limits decreased towards the cathode and increased around the anode for the clay soil. Both the linear shrinkage and free swell index decreased by 70% around anode and by 50% or more around cathode indicating the reduction in the potential for volumetric changes in the soils. The unconfined compressive strength of the soils increased at least by 30% while in some locations the strength increase was in excess of 100%. These results suggest the potential of developing this technique to deal with saline soil more effectively and efficiently, in particular in the remediation of salt affected land for infrastructure development.
Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)
Parent TitleWomen in Research Conference : a national conference about “Women Doing Research”, Gladstone CQU Campus, Gladstone, 24-25 November, 2005.
Number of Pages13
PublisherCentral Queensland University
Place of PublicationGladstone, Qld.
External Author AffiliationsCentral Queensland University; University of Ballarat;