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Bu-Ali Sina University
Graduate Studies ThesisDissertation Information
Title:
The Effect of Stabilization with Lime and Esfahan Basic Oxygen Steel Slag (BOS) on Durability of Clay and Chemical Contaminated Clay
Author: Neda Seifouri
Supervisor(s): Dr. Masoud. Makarchian
culty: Engineering
Department: Civil Engineering
Degree: Master of science
Field: Geotechnical Engineering
Subject: Civil Engineering
Number of Pages: 175
Defense Date: 1, 21, 2014
Approval Date:17, 9, 2012
Abstract:
Fine grain clayey soils cause problem for Civil Engineering projects. One of the improvement methods to modify the problems associated with clayey soils is to use lime for stabilization. However, when the clay contains sulfate ion or stabilized clay is exposed to hydrous sulfate, increasing the swelling of stabilized layer is observed due to chemical reactions between lime, sulfate, and clay minerals, which Ettringite and Thaumasite is formed and by water absorption of these minerals, more swelling is occurred. Recently, the new chemical composition for stabilization of clays has been used together with lime. Basic Oxygen Slag (BOS) is a new method to increase the strength of clay that in sequential freezing and thawing and wetting and drying process will face problem. In cold regions, the ice depth may reach to the clay layer of road subgrade layer which finally causes strength and bearing capacity to be decreased, and it is due to increase in moisture content of soil after thawing the ice. In this research, the effect of Esfahan Steel Company Basic Oxygen Steel Slag (BOS) on durability of clay with the help of unconfined compressive strength tests has been investigated in two stages, one without contaminant and the second contaminated with chemical materials like sodium and magnesium sulfates. In this research kaolinite clay is stabilized with different percentage of lime and slag in optimum moisture content, and after 28 day curing time at 35°C, durability tests were started. The specimen is made to tolerate six sequential cycles. For each state, 3 specimens are prepared. More than 400 specimens are made for durability tests. In wetting and drying tests, the specimen is submerged into water with mold to avoid the specimen demolition. The results show that slag together with lime cause improvement in strength and durability of clay. Also, the results show that freezing and thawing has more strength reduction than wetting and drying cycles. The durability test results show that sodium sulfate in comparison with magnesium sulfate contaminated clay and clay without contaminant causes more strength reduction. Indeed, sodium sulfate has more destructive effect in durability tests. There is a little research on the usage of (BOS) in stabilization of clay, whereas the slag is a waste in the nature, so the usage of this waste material can have economic and environmental importance.
Key Words: Clay, Stabilization, Lime, Slag, Sodium and Magnesium Sulfate, Freezing and Thawing, Wetting and Drying.
BU-Ali Sina University
Faculty of Engineering
Department of Civil Engineering
Thesis submitted for Master of Science in civil Engineering Geotechnical
Title
The Effect of Stabilization with Lime and Esfahan Basic Oxygen Steel Slag (BOS) on Durability of Clay and Chemical Contaminated Clay
Supervisor:
Masoud Makarchian (Ph. D)
By:
Neda Seifouri
January, 21, 2014
1- Basic Oxigen Steel Slag
1 – Kaolinite
2 – Illite
3 – Montmorillonite
4 – Chlorite
5 –

دسته بندی : No category

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