Effect of calcium and sodium ions in soft clay using electrokinetic stabilisation technique
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 d...
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| Main Authors: | , , , , , |
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| Format: | Conference or Workshop Item |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/6562/ http://eprints.uthm.edu.my/6562/1/303_Syakeera.pdf |
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| Summary: | 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 |
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