Prediction of Acoustic Properties of Porous Building Materials

Abstract

This article presents an empirical model for predicting acoustic properties of a composite material which is a mixture of sand and polyurethane resin as the binder. The parameters of the model were determined based on the experimental testing of samples with the thickness from 10mm to 50mm. Measurements of the sound absorption coefficient were performed in the impedance tube using the transfer function method (SRPS EN ISO 10534-2: 2008). The same samples were used for measurement of the air flow resistance in order to form an empirical model. The measurements were made according to the method defined by SRPS ISO 9053:1994. It was concluded that the proposed model can be used in order to predict the absorption properties of sand as well as of other building materials whose grain structure is air permeable.