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Highly compressible material (HCM), such as clay and materials containing high organic content, are increasingly used for applications in geoenvironmental engineering and agriculture (Nemati, et al., 2002; Paquet & Caron, 1993). In particular, deinking by-products (DBP) a clay and fibers spongy material produced in the early stage of the paper recycling process has been suggested by numerous authors as a cover material over landfills (Kraus, et al., 1997; Moo-Young & Zimmie, 1996; Cabral, et al., 1999; Burnotte, et al., 2000; Kamon, et al., 2002; Parent, 2006; Robart, 1998; Bédard, 2005) and mine waste top covers (Cabral, et al., 1999) as well as structural enhancement material in agricultural soils (Nemati, et al., 2000). The challenge with using DBP as part of a landfill cover was reviewed by Cabral et al. (2007) and Abdolahzadeh et al. (2010; 2008). The unsaturated hydraulic properties of DBP are fundamental for the design of top covers. Those properties are namely water retention curve (WRC), also commonly called soil-water characteristic curve (SWCC1) and hydraulic conductivity function (k-function). In the early stage of our projects concerning DBP, we needed to determine their hydraulic properties. DBP revealed to be highly compressible under the effect of suction, and classical models to represent the WRC of porous materials (Brooks & Corey, 1964; van Genuchten, 1980; Fredlund & Xing, 1994) usually do not take into account volume change during drying. Indeed, when a porous material dries, the capillarity phenomenon induces a tensile stress into the pores. As a result, the pores may shrink upon drying. Variations in pore structure

Hydraulic Conductivity and Water Retention Curve of Highly Compressible Materials- From a Mechanistic Approach through Phenomenological Models