Abstract
The objective of the present paper is to show an experimental method allowing the characterisation of Biot's hydro-mechanical coupling coefficient for cement mortar. This coefficient results from the mathematical formulation of a thermo-hygro-mechanical coupling model for non-saturated media [3, 8, 9, 11]. In the literature, the expression of Biot's coefficient is based on an empirical formula. The proposed method of its identification is bosed on two experiments: the dimensional variation tests and the characterisation of the elastic properties as a function of different relative humidity. We deduce Biot's coefficient by using the thermal-porous-elastic behaviour law of Coussy [2, 3]. In the literature, liquid Biot's coefficientb l is often approached with the degree of liquid, saturationS l . By comparing the results of liquid Biot's coefficientb l determined experimentally and the coefficient of liquid saturationS l , we show a good agreement between the two coefficients for small to moderate relative humidity. For important relative humidity (i.e. higher than 70%), the value of liquid Biot's coefficient is slightly lower than saturation.
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