An inverse modelling approach to estimate the hygric parameters of clay-based masonry during a Moisture Buffer Value test
(2014) Building and Environment — Vol. 81, p. 192-203 (2014)
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- Abstract
- This paper presents an inverse modelling approach for parameters estimation of a model dedicated to the description of moisture mass transfer in porous hygroscopic building materials. The hygric behaviour of unfired clay-based masonry samples is specifically studied here and widespread Moisture Buffer Value (MBV) protocol is proposed as a data source from which it is possible to estimate several parameters at once. For this purpose, the weight of two clay samples with different compositions is continuously monitored during several consecutive humidity cycles in isothermal conditions. Independently of these dynamic experimental tests, their moisture storage and diffusion parameters are measured with standard steady-state methods. A simple moisture transfer model developed in COMSOL Multiphysics is then used to predict the moisture uptake/release behaviour during the MBV tests. The probability distribution functions of four parameters of the model, given the experimental results, can be estimated with the recently developed Differential Evolution Adaptive Metropolis (DREAM) algorithm. These so-called 'posterior distributions' are compared to the values that were experimentally obtained in steady state. Because a precise understanding of parameters is needed to assess the confidence in the inverse modelling results, a sensitivity analysis of the model is also provided.
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Dubois, S., McGREGOR, F., Lebeau, F., Evrard, A., & HEATH, A. (2014). An inverse modelling approach to estimate the hygric parameters of clay-based masonry during a Moisture Buffer Value test. Building and Environment, 81, 192-203. https://doi.org/10.1016/j.buildenv.2014.06.018 (Original work published 2014)