Abstract
Granular materials have been studied for different acoustic treatment due to their sound
absorptive and sound insulating properties. These products, combined with cementitious, polyurethane or
expoxy binders, show a good degree of structural strength and durability with high values of acoustic
absorption [2], [3]. Expanded perlite is often used in lightweight concrete constructions. Ray et al. [1]
preliminarily investigated the utilization of perlite fine waste as an alternative to supplementary
cementitious materials. The purpose of this work is to experimentally investigate the acoustical properties
of this clay, loose and mixed with a polyurethane resin having different concentrations and low thicknesses.
