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A model of local kinetics of sorption to understand the water transport in bio-based materials

Abstract : The classic models describing the hygric mass transfers inside porous materials seem unsuitable in the case of bio-based materials. They are based on the assumption of instantaneous local equilibrium between relative humidity and water content [1]. These two parameters evolve according to the diffusive fluxes following the sorption isotherms. This study shows that it leads to predict much shorter times of stabilization than those experimentally obtained. A new approach is presented here, it frees from the local instantaneous equilibrium introducing a local kinetics to describe the transformation of water from vapor state to liquid state and vice versa. The local kinetics of sorption is coupled with the well-known hysteresis phenomenon. It is adjusted from bibliographic data [2] giving mass evolution of three hemp concretes under adsorption / desorption conditions. 1D cylindrical simulations allows an excellent fitting on the experiments. Finally, a semi-empirical model is proposed, allowing to determine the kinetics parameters more easily. The effect of the local kinetics model on the hygrothermal transfers occurring through a bio-based wall is then studied.
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N. Reuge, F. Collet, S. Pretot, S. Moissette, Marjorie Bart, et al.. A model of local kinetics of sorption to understand the water transport in bio-based materials. Cuong Ha-Minh; Dong Van Dao; Farid Benboudjema; Sybil Derrible; Dat Vu Khoa Huynh; Anh Minh Tang. CIGOS 2019, Innovation for Sustainable Infrastructure. Proceedings of the 5th International Conference on Geotechnics, Civil Engineering Works and Structures, 54, Springer, pp.495-500, 2019, Lecture Notes in Civil Engineering, ⟨10.1007/978-981-15-0802-8_77⟩. ⟨hal-02368114⟩

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