1. Test techniques and methods
1.1 General
Two suction control techniques were presented in the article Water in unsaturated soils :
in the "axis translation" technique ( § 2.3), a controlled air pressure is applied to the sample, while the water pressure is kept at zero;
in the osmotic technique ( § 2.4), we use a semi-permeable membrane and a solution of large molecules unable to cross the membrane.
These two techniques have been applied to various types of soil mechanics laboratory tests.
For the record, we would like to mention the vapour phase control of high suctions (...
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