Abstract
Sustainability in wet biomaterials embedded in the walls of a building for thermal or sound insulation purpose requires heat treatment, which is known as environment-friendly process, to change some chemical elements responsible for the degradation of the biomaterial. The objective of this work is to study the effect of the temperature of heat treatment cycle in HT on the apparent diffusion coefficient in cork, which was selected based on their ecological characteristics. This coefficient was evaluated indirectly from the measure of the crock conductivity in the radial direction combined with modeling at the range of 10-13 m/s. Likewise, the TGA analysis confirmed that the heat treatment at high temperature, which leads to the degradation of hemicellulose, cellulose and lignin, is more efficient due to the drop of the value of the diffusion coefficient.DOI: http://dx.doi.org/10.5755/j01.mech.22.1.12252
Highlights
The requirement of thermal and acoustic comfort in the field of civil engineering, it is very important to assess the durability of mechanical and acoustic behaviour of building biomaterials, through qualitative and quantitative analyses of chemical species flow in the pores of the biomaterials
Many studies have been performed on the mass transfer in various anisotropic materials. They are presented in the literature, but especially for the natural cork and its derivatives very few studies of the properties concerning their electrical and dielectric properties are found in scientific literature [5, 8]
Experiments were carried out in order to understand in particular the diffusion coefficient of material, where the effect of the cycle of the processing temperature is quantified by monitoring the desorption kinetics of the tracer (NaCl) through the voids of the anisotropic medium "cork" in the radial direction
Summary
The requirement of thermal and acoustic comfort in the field of civil engineering, it is very important to assess the durability of mechanical and acoustic behaviour of building biomaterials, through qualitative and quantitative analyses of chemical species flow in the pores of the biomaterials. They are presented in the literature, but especially for the natural cork and its derivatives very few studies of the properties concerning their electrical and dielectric properties are found in scientific literature [5, 8] To this purpose, experiments were carried out in order to understand in particular the diffusion coefficient of material, where the effect of the cycle of the processing temperature is quantified by monitoring the desorption kinetics of the tracer (NaCl) through the voids of the anisotropic medium "cork" in the radial direction. As determination of the diffusivity by conventional methods requires long and laborious steps, the conductivity method constitutes infact, a good alternative which requires less effort In this context, the apparent diffusion coefficient Dap of cork has been determined successive assessment starting from a mathematical model. The experimental database is used to develop a methodology that will be employed to determine the diffusion coefficient by a statistical approach based on Artificial Neural Networks, which will be a future study
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