On the modelling of the acoustical properties of hemp concrete
Résumé
Hemp concrete is an attractive alternative to traditional materials used in building construction. It has a very low environmental impact and it is characterized by high thermal insulation and sound absorption properties. The shape of hemp aggregates is parallelepiped and individual particles in a hemp mix can be organized in a plurality of ways. As a result, modeling of such material is quite complicated. This paper is focused on the fundamental understanding of the relations between the particle shape and size distribution and the acoustical properties of the resultant material mix. The sound absorption and the transmission loss of various hemp aggregates is characterized using laboratory experiments and three theoretical models. These models are used to relate the particle size distribution to the pore size distribution. It is shown that the pore size distribution is a main characteristic which controls the observed acoustical behavior.
Domaines
Acoustique [physics.class-ph]
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