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Physiochemical changes during electrokinetic stabilisation of dredged mud

conference contribution
posted on 25.10.2018, 00:00 by Mona MalekzadehMona Malekzadeh, J Lovisa, N Sivakugan, B Mathan
Electrokinetic stabilisation is a method of improving the geotechnical parameters and behaviour of a soft soil by the application of electric current between electrodes. This improvement is due to the physiochemical changes generated in the soil; however not all the changes are desirable. For instance, the reduction in pH near the anode can increase its corrosion rate. Therefore, it is important to study the physiochemical changes in the soil during electrokinetic stabilisation in order to estimate the behaviour of the soil in response to treatment. This study investigates the suitability of electrokinetic stabilisation for improving the geotechnical parameters and behaviour of dredged mud and demonstrates how the physiochemical nature of the soil changes during the process. For this purpose, two types of electrodes were used to transfer electric current through the soil and the changes in physiochemical nature of the dredged mud were investigated during and after the treatment. This entire process was conducted under closed conditions; that is, no water was allowed to flow through soil during stabilisation. Consequently, the water content of the soil was significantly reduced near the anode and this can be attributed to the changes of pH and physiochemical properties of the soil. It is concluded that this method is very well suited to dewater and consolidate dredged mud slurries.

Funding

Other

History

Parent Title

Proceedings of the International Congress on Environmental Geotechnics

Start Page

1473

End Page

1484

Number of Pages

12

Start Date

11/11/2014

Finish Date

14/11/2014

ISBN-13

9781922107237

Location

Australia

Publisher

Engineers Australia

Place of Publication

Australia

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

James Cook University

Era Eligible

No

Name of Conference

7th International Congress on Environmental Geotechnics (iceg 2014)