engineering properties and mineralogical composition
TRANSCRIPT
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Engineering properties and mineralogical composition
of expansive clays in Al-Qatif area (K.S.A).
Rafi Ahmad
Civil Engineering
1988
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 propertiese.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 aremixtures 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.
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Engineering Properties and Mineralogical
Composition of Expansive Clays in Al-Qatif Area
(K.S.A.)
by
Rafi Ahmad
A Thesis Presented to the
FACULTY OF THE COLLEGE OF GRADUATE STUDIES
KING FAHD UNIVERSITY OF PETROLEUM & MINERALS
DHAHRAN, SAUDI ARABIA
In Partial Fulfillment of the
Requirements for the Degree of
MASTER OF SCIENCE
In
CIVIL ENGINEERING
August, 1988
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