Effects of two different polymers and calcium chloride solution on the swelling behavior of an expansive soil
Estabragh, AR; Babaei, M; Javadi, AA; et al.Amini, M
Date: 2024
Article
Journal
Advances in Civil Engineering Materials
Publisher
ASTM International
Publisher DOI
Abstract
In this research the swelling properties of an expansive soil (bentonite) were investigated
through experimental tests, focusing on the effects of two different polymers:
polyethylene oxide or polyethylene glycol (PEO) and polyacrylamide (PAM), as well as
calcium chloride (CaCl2) solution. The soil samples were compacted by static ...
In this research the swelling properties of an expansive soil (bentonite) were investigated
through experimental tests, focusing on the effects of two different polymers:
polyethylene oxide or polyethylene glycol (PEO) and polyacrylamide (PAM), as well as
calcium chloride (CaCl2) solution. The soil samples were compacted by static compaction
in a special mold, to create consistent samples. Subsequently, the samples were subjected
to flooding with distilled water, solutions of the two polymers, or a CaCl2 solution at
concentrations of 2, 4, 6, and 8 g/l. The swelling potential and swelling pressure of the
samples were measured to assess their response. The results showed that the polymer
solutions effectively reduced both the swelling potential and swelling pressure of the
samples, indicating an interaction between the polymers and the soil. This interaction was
further supported by the scanning electron microscopy (SEM) results. Furthermore, the
type of flooding fluids (polymer or CaCl2 solution) and its concentration were found to
significantly influence on both the swelling potential and swelling pressure. Comparing
the results obtained, it was observed that PEO exhibited a greater reduction in soil
swelling compared to PAM. Additionally, the CaCl2 solution showed a more pronounced
effect on soil swelling compared to both polymers.
Engineering
Faculty of Environment, Science and Economy
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