Influence of the hydric state on the elastic and creep properties of self-standing clay films

Abstract eng:
Better understanding the hydromechanical behavior of clay-based materials is of interest for a variety of applications in petroleum or civil engineering. Here we study self-standing clay films whose thickness is of a few dozen microns. We characterize how the elastic and creep properties of those porous systems depend on relative humidity or, equivalently, water content: the dependence is very significant, and the relationship between stiffness and water content exhibits no hysteresis. The characterized mechanical properties also depend on the cation present in the interlayer water, from which we infer that the mesostructure of the films must play a significant role on their mechanical behavior.

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