Strength properties of ice–soil composites created by method of cryotropic gel formation

This paper considers the strengthening of both frozen soils and the soils after thawing in ice–soil composites generated by the method of cryotropic gel formation. The properties of the frozen soils (ice–soil composites) have to be improved for example in order to create reliable materials with low filtration factor for building weirs and other hydrotechnical constructions, which operate under a wide range of temperatures, including positive temperatures. The application of this method is very promising in terms of the creation of almost impermeable curtains for hydrotechnical structures in cold regions. It is very important that such elements are safe in both frozen and thawing conditions. Aqueous solutions of polyvinyl alcohol (PVA) are used for the formation of cryogels. This paper shows that the ice–soil composites, obtained by using the method of cryotropic gel formation, are sufficiently strong and watertight during thawing. Experimental data are provided.

► Strength of frozen soils and ice-soil composites increases after thawing-freezing.
► Stronger frozen soils are needed for hydrotechnical structures in cold regions.
► Method of cryotropic gel formation helps improve strength and elasticity of soils.