Effect of pore water chemistry on the behaviour of a kaolin–bentonite mixture during drying and wetting cycles
Estabragh, AR; Aoltani, A; Javadi, AA
Date: 21 January 2018
Article
Journal
European Journal of Environmental and Civil Engineering (TECE)
Publisher
Taylor & Francis
Publisher DOI
Abstract
The behaviour of a kaolin–bentonite mixture with different pore water quality, i.e. distilled water, NaCl
and CaCl2 solutions, was investigated through a number of cyclic drying and wetting tests. Experimental
tests were performed on compacted samples of the expansive soil (mixture of 80% kaolin and 20%
bentonite) in a modified ...
The behaviour of a kaolin–bentonite mixture with different pore water quality, i.e. distilled water, NaCl
and CaCl2 solutions, was investigated through a number of cyclic drying and wetting tests. Experimental
tests were performed on compacted samples of the expansive soil (mixture of 80% kaolin and 20%
bentonite) in a modified oedometer with different pore water quality under a surcharge pressure of 10
kPa. The vertical and radial deformations of the samples were determined during different stages of
drying and wetting. In addition, the soil–water characteristic curve was established by the filter paper
technique for samples with different pore water quality. The results indicate that the shrinking–swelling
deformation was nearly the same when the equilibrium condition was attained. Furthermore, the paths of
drying and wetting converged to an S–shaped curve at equilibrium condition. This curve consists of one
linear and two curvilinear portions, and the majority of the deformation occurred in the linear section. The
hysteresis phenomenon was also studied through the void ratio and suction, and the results indicated that
the hysteresis is gradually disappeared with increasing the number of drying and wetting cycles.
Engineering
Faculty of Environment, Science and Economy
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