Changing and equilibrating water content of triaxial test specimens without suction control

Date

2018-08-05

Author

Kenanoğlu, Melih Birhan
Toker, Nabi Kartal

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Testing of unsaturated soil specimens often involves moisture equilibrium through one of vari-ous means of suction control. This generally requires a long period of equilibration at the beginning of such a test. Going through a portion of this period by adjusting water content in a controlled manner beforehand, ra-ther than imposing a matric suction value, could decrease the total time each specimen occupies the suction-controlled test setup. Additionally, the capability to control water content of a specimen homogeneously would be beneficial in the absence of suction control, when identical specimens have to be tested at different water content values. In order to devise the most efficient methods of adjusting water content in both drying and wetting regimes, 5 cm diameter triaxial test specimens of a very low plasticity silt, and a high plasticity clay were subjected to a variety of procedures that do not require any specialized equipment. These trial pro-cedures include combinations of soaking, evaporation, rotation against gravity, weight measurement, thermal gradient application, and sealing the specimen in nylon bags, for various durations. Any sealed specimen would eventually reach moisture equilibrum; this study’s focus is the minimum duration required to reach such a state of homogeneous water content, which is found to happen in a matter of days. Spatial distribution of water content was checked in both axial and radial directions at the end of every trial, by dividing each specimen into 32 pieces and determining their water contents.

URI

http://gcf-conf.ust.hk/unsat2018/paper/pdf/1c-1.UNSAT2018_171.pdf
https://hdl.handle.net/11511/78396
https://www.issmge.org/uploads/publications/62/63/1c-1.UNSAT2018_171.pdf

Conference Name

The 7th International Conference on Unsaturated Soils (UNSAT2018), (3 - 05 August 2018)

Collections

Department of Civil Engineering, Conference / Seminar

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Citation Formats

M. B. Kenanoğlu and N. K. Toker, “Changing and equilibrating water content of triaxial test specimens without suction control ,” Hong Kong, Hong Kong, 2018, vol. 2, Accessed: 00, 2021. [Online]. Available: http://gcf-conf.ust.hk/unsat2018/paper/pdf/1c-1.UNSAT2018_171.pdf.