Abstract
This paper treats the moisture-related characteristics of bio-based construction materials. Experiments were conducted using the wet cup method and the isothermal adsorption method. This last method provided information on the amount of absorbed moisture by each material, while the wet cup method measured the amount of moisture vapor crossing the material and the moisture resistance of the material. Two different samples were studied and compared: the first one is from a lightweight earth material having a good thermal insulation property. The second one is the cob material characterized by its durability and mechanical structures. By assuming that the absorbed moisture flux is equivalent to the flux passing through the material under steady state conditions, the study was able to calculate transfer coefficients such as water vapor permeability, moisture diffusion coefficient, and ambient transfer coefficient.
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Abbreviations
- \({\text{g}}_{{{\dot{\text{m}}}}} ,{\text{g}}_{{\text{v}}}\):
-
Flux density, Kg/ s m2
- \(\Delta {\dot{\text{m}}}_{12}\):
-
Mass flow, Kg/s
- \({\text{p}}_{{\text{v}}}\):
-
Vapor pressure, Pa
- \({\updelta }_{{\text{p}}}\):
-
Material vapor permeability, Kg/ s m Pa
- \({\text{D}}_{\emptyset }\):
-
Moisture diffusion coefficient, Kg/ s m %
- \({\upbeta }\):
-
Ambient transfer coefficient, Kg/s m2 Pa
- \({\updelta }_{{\text{a}}}\):
-
Air vapor permeability, Kg/ s m Pa
- \({\emptyset}\):
-
Relative humidity, %
- \({\text{S}}\):
-
Surface, m2
- \({\upmu }\):
-
Water vapor resistance factor, [-]
- d:
-
Thickness, cm
- \({\text{P}}_{{{\text{sat}}}}\):
-
Saturated vapor pressure, Pa
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Acknowledgments
This work is conducted under Cobbauge project selected by the European cross-border cooperation program INTEREG V France (Manche)-England. The authors would like to thank ERDF for the funding of this work.
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Kaoutari, T., Taouirte, Y., Louahlia, H., Boutouil, M., Goodhew, S., Streif, F. (2024). Hygrometric Characterization of New Bio Sourced Materials for Building Construction. In: Ali-Toudert, F., Draoui, A., Halouani, K., Hasnaoui, M., Jemni, A., Tadrist, L. (eds) Advances in Thermal Science and Energy. JITH 2022. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-031-43934-6_44
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DOI: https://doi.org/10.1007/978-3-031-43934-6_44
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