Análise do desempenho acústico de contrapiso flutuante reforçado com fibras poliméricas.

Abstract

Aiming to meet the minimum acoustic insulation performance criteria of the floor system of the autonomous units of a building, this work analyzed whether the floating subfloor system with the addition of polymeric fibers over the acoustic mat meets the requirements established in the ABNT NBR 15575, of 2013, taking into account the variation in the thickness of the subfloor layer. For this analysis, an impact insulation test was carried out on 16 samples, using the measurement methodology specified in ISO 16283-2, 2018. Two mechanical tests were also carried out, namely the compressive strength test and the tensile strength by diametrical compression. From the results obtained, it was possible to verify that all the subfloors with the addition of polymeric fibers on the analyzed acoustic mat reached the acoustic performance requirements established in the norm. The study demonstrated that, despite the literature recommending screeds with thickness greater than 4 cm, the screeds with thicknesses of 2 and 3 cm meet intermediate levels of acoustic performance. With that, it is concluded that the polymeric fibers can be applied as an alternative to the reinforcement of the subfloor, guaranteeing satisfactory acoustic and mechanical performance, replacing the steel screens and allowing a productivity gain in the application of the system.