Influência da aplicação de produtos de proteção passiva ao fogo no comportamento acústico de lã de PET

Abstract

The finishing and coating materials for civil construction must meet technical criteria aimed, primarily, at the safety of users. In this context, the materials used to improve the acoustic quality of environments must have, as a basic premise, the compliance with legislation and normative references that define the appropriate classification for fire safety in internal environments. That said, this research aimed to perform an analysis on the influence of the application of passive fire protection surface coatings, on the sound absorption behavior of 100% PET wool, a fibrous material already studied and validated as a good acoustic absorber. The passive fire protective surface coatings were intumescent paint for acoustic foams, applied to PET wool, and flame retardant fabric to 100% polyester fabric. The substrate, the PET wool, was used in two compositions: in the thickness of 60 mm and density of 20 kg/m³ and in the thickness of 60 mm and density of 30 kg/m³. To achieve the proposed objective, experimental research was carried out to obtain the absorption coefficients of materials with and without the application of passive fire protection products, through impedance tube testing, according to the procedure of the ISO 10534-2 standard. In addition, ignitability tests were carried out, in accordance with the requirements of ISO 10534-2:1998, on materials with and without passive fire protection. Applying the proposal, was found that the samples of raw PET wool and the samples of PET wool with fabric with retardant suffered ignition, while the samples with intumescent paint did not have ignition. As for the sound absorption coefficient, the samples with and without the application of intumescent paint were compared and was found that the loss of sound absorption is bigger in the medium and high frequencies, representing, in the worst case, a difference of αs=0,11, in the densest wool. However, was identified that the density difference of the tested materials is more significant than the presence or absence of the passive fire protection coating.