Determinação de coeficiente de absorção acústica em placas fabricadas com resíduos de E.V.A.

Abstract

In this work, the properties of cementitious matrix composites were studied, using the Ethylene Vinyl Acetate (EVA) residue as an aggregate, with a view to its use as acoustic absorbent material, in the form of plates. In particular, the effect of porosity and resistivity on the air flow in the acoustic absorption capacity of the prepared plate was investigated. The method used to determine the acoustic absorption coefficient of the plates was by means of a reverberant chamber test, one of the objectives of the present work being to assemble and calibrate such reverberant chamber. The applied methodology was aimed at characterizing the relationship between granulometry, void index, resistivity to the air flow and the acoustic absorption capacity of plates made with the residue under study, besides defining the prototypes to be tested in reverberant chamber. The results indicated the possibility of replacing industrialized materials with the compounds produced from cement and EVA residue in frequency bands above 1 kHz.