Transmission loss em painéis aglomerados de bagaço de cana-de-açúcar Saccharum officinarum L.

Abstract

The study of the materials acoustic performance is important for a building design area with respect to ambience aspects. The high levels of sound pressure in the workplace compromise the workers' hearing health and also a concentration of these, with negative repercussions on productivity. Fibrous materials are widely applied in acoustic absorption systems, and in this sense, coupled with concern for environmental and cost issues, this work uses and evaluates a biodegradable and renewable fibrous natural waste was used, such as an aggregate panel of sugarcane residue, in order to identify the loss of sound transmission in panels with nanoparticles and different densities. The panels was tested in small-scale tempered glass reverberating chambers as partitions under different conditions of multilayers and thicknesses. The small-scale model aimed to characterize the material under real simulation conditions, in which diffuse waves were transmitted. The results showed a strong correlation between the layers of air and the use of nanoparticles in treatments with low density in medium frequency presenting transmission loss values between 25 and 45 dB. A positive effect of double thickness at a low frequency was also observed for treatments with higher density, and at average frequency for treatments with lower density, which reached values of 20 to 40 dB, in the range of 500 to 4000 Hz. At high frequencies, increments of layers of air and double thickness were efficient in low density treatments. For those with higher densities, it only responded favorably to the layers of air.