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From fiber to wall: PHYSical approach of hygrothermal transfers in BIO-based construction MATerials

Project description

Internal physical processes of bio-based construction materials

Bio-based construction materials such as wood, hemp, and cellulose reduce carbon emissions and enhance comfort by buffering moisture. Their effectiveness relies on the interaction of water and heat transfer. However, evaluations often lack detailed physical information. The ERC-funded PHYSBIOMAT project aims to explore the internal physical processes of bio-based construction materials, focusing on sorption dynamics, water diffusion, and fibre configuration. The project will develop a comprehensive model of hygrothermal phenomena and extend it to full-scale materials. It will use non-invasive, time-resolved magnetic resonance imaging (MRI) to measure moisture content and time-resolved temperature distribution. Additionally, the project will create open-source software to predict the hygrothermal characteristics and performance based on material properties and environmental conditions.

Objective

Bio-based construction materials are air-fiber systems, such as wood, hemp, cellulose, flax, etc., possibly coated with a mineral paste. They represent a promising solution for carbon emission reduction, due to their low production cost and their partial or full recyclability. Moreover, they bring more comfort to the occupants thanks to their moisture-buffering capacity, and they require less energy for heating or cooling. These qualities are obtained through exchanges between water vapor and “bound water”, i.e. water absorbed in the solid structure, combined with heat transfers. Consequently, understanding and predicting water and heat (hygrothermal) transfers in such materials is essential to selecting them appropriately, adjusting their conditions of use, and designing innovative materials. However, the current analysis of their performance is generally based on limited evaluations at a global scale or via macroscopic models lacking physical information.
My idea is instead to open the black box and start from the fiber scale, to explicitly describe the internal physical processes at this scale, including sorption dynamics, bound water diffusion, fiber configuration, etc., and then to progressively complete and extend this approach to full-scale materials. This can be used to build for the first time a generic description, understanding, and modelling, of hygrothermal phenomena in bio-based construction materials. This physical description will be supported and enriched by several experimental innovations. Notably, internal measurements of the spatial distribution of moisture content and temperature in time will be obtained from non-invasive time-resolved magnetic resonance imaging (MRI), which can be used to validate the models and determine diffusion properties in an unequivocal way. Finally, I will develop an open-source software predicting hygrothermal characteristics and performance based on material characteristics and history of ambient conditions.

Fields of science (EuroSciVoc)

Keywords

Programme(s)

Topic(s)

Funding Scheme

HORIZON-ERC - HORIZON ERC Grants

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Call for proposal

(opens in new window) ERC-2022-ADG

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Host institution

UNIVERSITE GUSTAVE EIFFEL
Net EU contribution
€ 2 500 000,00
Address
5 BOULEVARD DESCARTES CAMPUS DE MARNE-LA-VALLE
77454 MARNE-LA-VALLEE
France
Region
Ile-de-France Ile-de-France Paris
Activity type
Higher or Secondary Education Establishments
Links
Total cost
€ 2 500 000,00

Beneficiaries (1)