ACOUSTICAL PROPERTIES OF HEMP-CLAY : FROM MATERIAL TO WALL SCALE

Author(s): P. Glé, G. Massosa-Telo, E. Gourdon, A. Hellouin-de-Menibus, M. Degrave-Lemeurs
Paper category: Proceedings
Book title: Proceedings of the 3rd International Conference on Bio-Based Building Materials ICBBM 2019
Editor(s): Mohammed SONEBI and Sofiane AMZIANE
ISBN:
e-ISBN: 978-2-35158-229-9
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 729 - 730
Total Pages: 2
Language: English

Abstract: Hemp-clay is a promising materiel dedicated to sustainable building thermal insulation. It brings a
very low embodied energy (up to 20 times lower than hemp-lime materials) and can be largely
available at a local scale. In the framework of Ecoterra project, special attention is given to the
acoustic properties of these materials.
A first study has been carried out to investigate the acoustical behavior of this mix at the material
scale. In this work, more than 200 hemp-clay samples were characterized to get a global view of
the acoustical performances of such materials. In addition to that, the unusual multiscale behavior,
the poroelastic dissipation, and the first order effect of hemp concentration in hemp-clay have also
been highlighted.
In order to continue these investigations, studies were then carried out at the wall scale, to test
more representative systems of building envelopes, including coatings effect as well as timber
frame effect. A new experimental campaign has been carried out with more than 20 samples
(60*60 cm2) using an intensimetry approach. The results give us an interesting visibility on spatial
homogeneity and sound transmission loss levels as a function of various parameters (thickness,
density, manufacturing process, coatings and frame existence).
The purpose of this presentation is to discuss the main results of these studies, and to draw the
relationships existing between material and wall scales on the basis of a multilayer modelling, the
transfer matrix method.

Online publication: 2019
Publication type: full_text
Public price (Euros): 0.00