Hydromechanical Behavior of a Tuff/Bentonite Mixture Treated with Cement

2022-01-01
Demdoum, Abdellah
Daheur, Elhadj Guesmia
Loualbia, Hamza
Bounouara, Zahra
Ghembaza, Moulay Smaine
Akgün, Haluk
© 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Sandy soil-clay mixtures are commonly used as a liner/barrier material in various engineering applications, such as construction of hydraulic and waste containment. In this study, the hydromechanical characteristics of tuff-bentonite and tuff-bentonite/cement mixtures are investigated to propose a local barrier material. A series of free swelling, one-dimensional consolidation and falling head permeability tests for hydraulic characteristics as well as the direct shear test for mechanical characteristics were performed on four different tuff-bentonite mixtures and two different tuff-bentonite/cement mixtures. Test results show that the compressibility/swelling behavior of the mixtures increases with increasing bentonite content. The optimum amount of bentonite to achieve a permeability of less than 10–9 m/s, which is a liner/barrier design requirement, was found at 8% and 10%. The results of the strength tests indicate that the apparent cohesion increases with the bentonite content, while the apparent angle of friction decreases. Concerning the optimal mix treated with 3% and 5% cement, the test results show that the permeability and compressibility/swelling behavior decrease with the added cement content, while the angle of friction and cohesion increase. Finally, it was concluded that the 8% bentonite-92% tuff mixture treated with 3% cement is retained as a passive barrier material for landfill sites in arid and semi-arid regions.
6th International Conference on Geotechnics, Civil Engineering and Structures, CIGOS 2021

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Citation Formats
A. Demdoum, E. G. Daheur, H. Loualbia, Z. Bounouara, M. S. Ghembaza, and H. Akgün, “Hydromechanical Behavior of a Tuff/Bentonite Mixture Treated with Cement,” Hạ Long Bay, Vietnam, 2022, vol. 203, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85119442855&origin=inward.