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Engineering properties and mineralogical composition of expansive clays in Al-Qatif area (K.S.A).

Ahmad, Rafi (1988) Engineering properties and mineralogical composition of expansive clays in Al-Qatif area (K.S.A). Masters thesis, King Fahd University of Petroleum and Minerals.

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English Abstract

Al-Qatif is a town in the Eastern Province of Saudi Arabia where expansive soil problems are reported. This study is concerned with the determination of engineering properties and behavior of these clays by performing various laboratory tests. A site investigation was carried out to obtain undisturbed block samples. Geotechnical properties e.g. Atterberg limits, natural water content and density, showed that Al-Qatif clays are highly expensive and are heterogeneous in nature. Quantitative characterization to estimate the amount of anticipated volume change was carried out using conventional one-dimensional consolidometer. The results of direct swelling tests indicated high values of swelling pressure and percentage of swell. X-ray diffraction and scanning electron microscopic analysis indicated that Al-Qatif clays are mixtures of two principal clay minerals: montmorillonite (pure smectite) and polygorskite with flaky flocculated morphology and needle form. Chemical analysis showed the presence of low amount of organic matter. All soil samples were alkaline in character with high cec values. Laboratory evaluation of chemical stabilization was done using three types of chemicals. The results showed that 4-8% of commercial lime should be preferred for preconstruction treatment of Al-Qatif clays. Some methods of special foundation designs and floor slab construction are also suggested.



Item Type:Thesis (Masters)
Date:1988
Date Type:Completion
Subjects:Civil Engineering
Divisions:College Of Engineering Sciences > Civil Engineering Dept
Creators:Ahmad, Rafi
Committee Advisor:Abduljauwad, Sahel N.
Committee Members:Basunbul, I. A. and Faruque, M.O.
ID Code:9644
Deposited By:KFUPM ePrints Admin
Deposited On:22 Jun 2008 16:45
Last Modified:25 Apr 2011 09:13

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