Examples Are Presented of the Ultimate Boundary Drying Curve of a Porous Body. The Difference Between the Saturation Moisture Content and the Ultimate Moisture Content at Zero Suction Represents the Total Volume of AIr Entrapped During the Passage of the First Boundary Wetting Curve. The Reproducibility of the Hysteresis Loop Which Corresponds to a Certain Cycle of Suction Changes, Suggests That AIr Is Always Entrapped in the Same Pores, as Least as Far as the Wetting Is Repeated in the Same Reasonably Smooth and Uniform Manner. The Difference in Slope Between the Saturation and the Ultimate Drying Curves Is a Measure of the Volume of AIr Entrapped in Pores Draining in a Unit Suction Interval. It Is Then Possible to Obtain a Family of Primary Wetting Curves, the Starting Point of Each of Which Is Defined by the Same Suction That Lies on One of Various Drying Curves, as Well as to Measure the Hydraulic Conductivity Along Numerous Drying Curves. The Static Technique Is Used to Study the Effect of the Entrapped AIr on the Hysteresis Curves. Experimental Results Concerning the Effect of the Entrapped AIr on the Hysteresis Curves as Well as on the Hydraulic Conductivity Are Reported. The Hydraulic Conductivities Along the Saturation and the Ultimate Boundary Drying Curves Are Plotted as a Function of Suction.
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A. Poulovassilis (1970) studied this question.