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Effect of calcium and sodium ions in soft clay using electrokinetic stabilisation technique

Nordin, Nurul Syakeera and Ahmad Tajuddin, Saiful Azhar and Abdul Kadir, Aeslina and Mustakim, Fajaruddin and Mohammad Azmi, Mohamad Azim and Mohamed Hanif, Mohamed Nur Shafiq (2014) Effect of calcium and sodium ions in soft clay using electrokinetic stabilisation technique. In: International Integrated Engineering Summit (IIES 2014), 1-4 December 2014, Universiti Tun Hussein Onn Malaysia, Johor.

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Abstract

Electrokinetic Stabilisation (EKS) technique is the combination processes of electroosmosis and chemical grouting. This study involves investigating on the performance of EKS technique to stabilise the soft clay soils. Stabilising agents will assist the EKS technique by inducing it into soil under direct current and its movement is governed by the principle of electrokinetic (EK). The objective of this research is to study the effectiveness of EKS technique to increase the strength of soft clays. Two reactors were set up by using 1.0 M of calcium chloride (CaCl2) and sodium silicate (Na2SiO3) as the electrolyte, and stainless steel plates as the electrodes. EKS technique was performed in 21 days period of time with a constant voltage gradient (50 V/m). This technique is carried out in two phases where the difference between them is a combination of the stabilising agent. The difference combination of stabilising agents between phase 1 and phase 2 were CaCl2 – distilled water (DW) and CaCl2 – Na2SiO3, respectively. The results of strength, liquid limit (LL), plastic limit (PL), plastic index (PI), pH and ion concentration test towards untreated and treated soil is presented. Showing the strength of treated soil for both phases were increased near the cathode section with 27.83 kPa and 27.67 kPa. LL and PI for treated soil showing the highest value were occurred near the cathode, while PL seems consistant with values from untreated soil. Calcium (Ca+) and sodium (Na+) concentrations in soil showing it were increased compared to untreated soil, hence it proved that the application of stabilisers in EK treatment is more effective in increasing the strength and the stability of soils

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: electrokinetic stabilisation technique; soft clay; calcium; sodium; stainless steel
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA703-711 Engineering geology. Rock mechanics. Soil mechanics.
Divisions: Faculty of Civil and Environmental Engineering > Department of Infrastructure and Geomatic Engineering
Depositing User: Mrs. Nurhayati Ali
Date Deposited: 09 Jun 2015 07:05
Last Modified: 09 Jun 2015 07:05
URI: http://eprints.uthm.edu.my/id/eprint/6562
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