Stabilization of peat soil using electrochemical injection technique

The peat soils are naturally very soft and undergo large settlements. Due to its low shear strength and high compressibility, such soils are geotechnically problematic. To improve the physicochemical characteristics of the peat soil, electrokinetic (EK) injection technique was used by applying a di...

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Main Author:	Moayedi, Hossein
Format:	Thesis
Language:	English
Published:	2012
Subjects:	Peat soils
Online Access:	http://psasir.upm.edu.my/id/eprint/47517/1/FK%202012%2046R.pdf
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id	my-upm-ir.47517
record_format	uketd_dc
spelling	my-upm-ir.475172016-07-14T03:33:18Z Stabilization of peat soil using electrochemical injection technique 2012-10 Moayedi, Hossein The peat soils are naturally very soft and undergo large settlements. Due to its low shear strength and high compressibility, such soils are geotechnically problematic. To improve the physicochemical characteristics of the peat soil, electrokinetic (EK) injection technique was used by applying a direct electrical potential across the soil specimens. Four chemical reagents namely, sodium silicate (Na2SiO3), calcium oxide (CaO), calcium chloride (CaCl2), and aluminium hydroxide (Al(OH)3) were used as chemical stabilizers. A series of unconfined compressive strength (UCS), pH, water content, microstructure analysis, surface electrical charge, and rheology on the treated soil were conducted. The UCS values for stabilized peat soil samples were optimized at the 8, 6, 6, and 4%, of sodium silicate, calcium oxide, calcium chloride,and aluminum hydroxide respectively. However, the UCS values were decreased beyond the mentioned percentages for all the samples. The surface electrical charge properties of the peat treated with chemical stabilizers in different molarities and pH were also investigated. The average natural pH of peat soil samples was found to be equal to 5.93 with  potential of 17.05 mV. The chemical stabilizer type and concentration showed an important effect on the surface electrical charge of peat soil particles. Lastly, a large scale EK equipment was developed to inject chemical stabilizer through the baseline peat soil in order to enhance its undrained shear strength, pH, and moisture content characteristics. The undrained shear strength (measured by van shear test), soil pH, and moisture content of treated soil with the large EK instrument were measured. It was found that the undrained shear strength of treated soils was increased by interparticle cementation caused by the electrochemical injection of ions into the soil under the DC field. It can be concluded that injecting chemical stabilizer by using the EK technique could significantly increase the treated soil shear strength and decrease its moisture content. Peat soils 2012-10 Thesis http://psasir.upm.edu.my/id/eprint/47517/ http://psasir.upm.edu.my/id/eprint/47517/1/FK%202012%2046R.pdf application/pdf en public phd doctoral Universiti Putra Malaysia Peat soils
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Peat soils
spellingShingle	Peat soils Moayedi, Hossein Stabilization of peat soil using electrochemical injection technique
description	The peat soils are naturally very soft and undergo large settlements. Due to its low shear strength and high compressibility, such soils are geotechnically problematic. To improve the physicochemical characteristics of the peat soil, electrokinetic (EK) injection technique was used by applying a direct electrical potential across the soil specimens. Four chemical reagents namely, sodium silicate (Na2SiO3), calcium oxide (CaO), calcium chloride (CaCl2), and aluminium hydroxide (Al(OH)3) were used as chemical stabilizers. A series of unconfined compressive strength (UCS), pH, water content, microstructure analysis, surface electrical charge, and rheology on the treated soil were conducted. The UCS values for stabilized peat soil samples were optimized at the 8, 6, 6, and 4%, of sodium silicate, calcium oxide, calcium chloride,and aluminum hydroxide respectively. However, the UCS values were decreased beyond the mentioned percentages for all the samples. The surface electrical charge properties of the peat treated with chemical stabilizers in different molarities and pH were also investigated. The average natural pH of peat soil samples was found to be equal to 5.93 with  potential of 17.05 mV. The chemical stabilizer type and concentration showed an important effect on the surface electrical charge of peat soil particles. Lastly, a large scale EK equipment was developed to inject chemical stabilizer through the baseline peat soil in order to enhance its undrained shear strength, pH, and moisture content characteristics. The undrained shear strength (measured by van shear test), soil pH, and moisture content of treated soil with the large EK instrument were measured. It was found that the undrained shear strength of treated soils was increased by interparticle cementation caused by the electrochemical injection of ions into the soil under the DC field. It can be concluded that injecting chemical stabilizer by using the EK technique could significantly increase the treated soil shear strength and decrease its moisture content.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Moayedi, Hossein
author_facet	Moayedi, Hossein
author_sort	Moayedi, Hossein
title	Stabilization of peat soil using electrochemical injection technique
title_short	Stabilization of peat soil using electrochemical injection technique
title_full	Stabilization of peat soil using electrochemical injection technique
title_fullStr	Stabilization of peat soil using electrochemical injection technique
title_full_unstemmed	Stabilization of peat soil using electrochemical injection technique
title_sort	stabilization of peat soil using electrochemical injection technique
granting_institution	Universiti Putra Malaysia
publishDate	2012
url	http://psasir.upm.edu.my/id/eprint/47517/1/FK%202012%2046R.pdf
_version_	1747811932280193024

Stabilization of peat soil using electrochemical injection technique

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