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 (TECE)
Taylor & Francis
© 2018 Informa UK Limited, trading as Taylor & Francis Group
Reason for embargo
Under embargo until 21 January 2019 in compliance with publisher policy
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.
This is the author accepted manuscript. The final version is available from Taylor & Francis via the DOI in this record.
Published online 21 January 2018