The present study highlights about mechanical properties of
clay containing smectite and carbonate. Numerous research has examined the
relationship between the mechanical behavior and physicochemical
characteristics of clays. Because they are relevant to various fields, such as
cleanup, mud drilling, civil engineering, and the storage of radioactive and
hazardous waste, the mechanical properties of clays are very significant. The
smectite used in this work is from southwestern Tunisia, specifically from Oued
Tfal, near the town of Gafsa, and is referred to as “OT”. This study involved
characterizing the physicochemical and mechanical properties of the raw clay
following treatment with hydrochloric acid and purification. The work aims at
elucidating the influence of the pure clay fraction, including compensating
cations, on the clay’s hydromechanical properties. The thermal study sample
revealed 32.5% of carbonates in the raw clay. The elimination of carbonates by
acid attack yielded the following results: If treatment by 0.5M HCl represents
a total elimination of carbonates, the clay fraction probably contains altered
layers. To eliminate the excess carbonate (6.03%), the sample was treated with
0.4 M HCl without deterioration of the structure of the silicate fraction. The
hydromechanical study of three clay samples (raw (OT), purified (OTNa), and
0.4M HCl-treated) clearly showed the relationship between the cation exchange
capacity, the percentage of carbonate content, and the swelling pressure. In
the oedometer-based mechanical study, the measures of swelling pressures under
constant load yielded values of 15.46, 90.00, and 274.60 kPa for OT, OT (0.4),
and OTNa, respectively. These values highlight the high swelling of the clay
fraction of the deposit of Oued Tfal, and the effect of carbonate on the
mechanical stability of this clay, as 6% carbonates significantly altered the
swelling properties of the clay.
Author(s) Details
M. Mhamdi
Laboratory for the Application of Materials to the
Environment, Water and Energy LAMEEE (LAM3E), Science Faculty of Gafsa,
University of Gafsa, 2112 Gafsa, Tunisia, Laboratory of Applications of
Chemistry to Natural Resources and Substances and the Environment (LACReSNE),
Faculty of Sciences of Bizerte, University of Carthage, 7021 Zarzouna, Tunisia
and Chemistry Department, Al Baha University, Al Bahah, Saudi Arabia.
N. Gasmi
Laboratory of Applications of Chemistry to Natural Resources
and Substances and the Environment (LACReSNE), Faculty of Sciences of Bizerte,
University of Carthage, 7021 Zarzouna, Tunisia.
E. Elaloui
Laboratory for the Application of Materials to the
Environment, Water and Energy LAMEEE (LAM3E), Science Faculty of Gafsa,
University of Gafsa, 2112 Gafsa, Tunisia.
N. Kbir-Ariguib
Laboratory of Applications of Chemistry to Natural Resources
and Substances and the Environment (LACReSNE), Faculty of Sciences of Bizerte,
University of Carthage, 7021 Zarzouna, Tunisia.
M. Trabelsi -Ayadi
Laboratory of Applications of Chemistry to Natural Resources
and Substances and the Environment (LACReSNE), Faculty of Sciences of Bizerte,
University of Carthage, 7021 Zarzouna, Tunisia.
Please see the book here:- https://doi.org/10.9734/bpi/cmsdi/v4/788
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