Feedback on a Multiscale Investigation on the Acoustical Properties of Biobased Building Materials
Résumé
Acoustical performances of building elements including natural sustainable fibrous and granular materials are to date still poorly known, which limits their use and spread in the building market. In order to make progress on this aspect, an ambitious study was carried out in partnership between Cerema and CSTB. Several types of biobased materials have been considered, including vegetal wools (wood, flax, hemp, cellulose), but also vegetal aggregates or concretes (loose husks and hulls, shiv, hemp concrete). Experimental investigations were organized at the material scale (through measurement of physical parameters as well as sound absorption and transmission loss in normal incidence) and at building element scale (through sound absorption and airborne sound insulation in diffuse field conditions). In a second step, the parameters evaluated at the material scale have been injected into a prediction software (based on a transfer matrix approach and integrating a spatial filtering method to take into account the finite size of building systems and a coupling with a SEA approach to take into account structural paths) in order to predict the acoustic performance of the building elements. The idea of this presentation is to focus on the key results of this study and to develop the application of a roof with lost attics including loose vegetal particles?
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