Avaliação das propiedades acústicas de argamassas cimentícias com substituição parcial de resíduo de lã de rocha

Abstract

The pursuit of high-performance acoustic technologies, driven by the growing noise pollution in large cities and the lack of proper disposal for construction waste, has increased interest in research focused on acoustic comfort. Accordingly, this study evaluated the sound insulation and sound absorption properties of cementitious mortars incorporating rock wool waste as a partial replacement for fine aggregate, through impedance tube tests, consistency index tests, and microscopic and granulometric characterization of the ground material. The results showed an improvement of up to 48.2% in sound transmission loss at 250 Hz and 33.5% at 500 Hz for the mix with 30% incorporation, with no corresponding improvement in sound absorption. It was also found that the incorporation required a higher water/cement ratio to maintain the mortar's workability, and that the ground material retained a mixed composition (powder particles and fibers) even after sieving through a 300 m. It is concluded that rock wool is a viable alternative for acoustic μtreatment aimed at surface sound insulation, although it shows unsatisfactory performance regarding sound absorption.