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    Effect of pore water chemistry on the behaviour of a kaolin–bentonite mixture during drying and wetting cycles

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    Author
    Estabragh, AR; Soltani, A; Javadi, AA
    Date
    2020
    Source Title
    European Journal of Environmental and Civil Engineering
    Publisher
    Taylor & Francis
    University of Melbourne Author/s
    Soltani, Amin
    Affiliation
    Infrastructure Engineering
    Metadata
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    Document Type
    Journal Article
    Citations
    Estabragh, A. R., Soltani, A. & Javadi, A. A. (2020). Effect of pore water chemistry on the behaviour of a kaolin–bentonite mixture during drying and wetting cycles. European Journal of Environmental and Civil Engineering, 24 (7), pp.895-914. https://doi.org/10.1080/19648189.2018.1428691.
    Access Status
    Access this item via the Open Access location
    URI
    http://hdl.handle.net/11343/253936
    DOI
    10.1080/19648189.2018.1428691
    Open Access URL
    https://ore.exeter.ac.uk/repository/bitstream/10871/31192/1/European%20Journal%20of%20Environmental%20and%20Civil%20Engineering%20-%202018.pdf
    Abstract
    The behaviour of a kaolin–bentonite mixture with different pore water chemistry, i.e. distilled water, NaCl and CaCl2 solutions, was investigated through a number of cyclic drying and wetting tests. Experimental tests were carried out on compacted samples of the expansive soil (i.e. mixture of 80% kaolin and 20% bentonite) in a modified oedometer with different pore water chemistry 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 chemistry. 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 diminished with increasing the number of drying and wetting cycles.

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