Desenvolvimento de contrapiso autonivelante para redução do ruído de impacto em edificações

Abstract

DELAZERI; J, C. Development of self-levelling subfloor to reduce impact noise in buildings. São Leopoldo, 2021. 111 f. Master's thesis of the Postgraduate Program in Architecture and Urbanism, University of Vale do Rio dos Sinos (UNISINOS), São Leopoldo. 2021. The growth of cities and population brings benefits to the inhabitants and an increase in civil construction, however, it causes the discomfort generated by external and internal noise, and therefore the acoustics of buildings are extremely important. Simultaneously to this, there is a need for performance study evidences. In this dissertation, the acoustic potential of self-levelling subfloors developed with partial and total replacement of sand by residue from the footwear industry, Ethylene Vinyl Acetate (EVA), was studied. The following replacement contents were 40%, 60% and 100%; and impact noise measurements were carried out in the laboratory on plates of 2.50 cm, 5.00 cm and 7.00 cm thick, with subfloor plates molded on the slab, with a size of 80 cm x 80 cm. As sand was replaced by EVA in the dosages, we had a greater reduction in impact noise, which was noticeable from the frequency of 500 Hz. Regarding the variation in the thickness of the plates, there was no improvement in the sound pressure level weighted normalized impact, and there was an inversion of the position in the logarithmic curve due to the damping. From the preliminary study on small size boards (80 cm x 80 cm), a board the size of the acoustic room of 16.28 m², 5 cm thick was molded, using the line with 100% replacement of sand by EVA in order to confront the performance of the two plates. It is concluded that the performance in the test was identical. Thus, this study provided a reduction of Ln,w 23 dB with the use of a self-levelling screed with 100% EVA residue, when compared with the performance of a 12 cm thick solid concrete slab without the use of screed. Regarding the standard NBR 15757-3 (ABNT, 2013), making an analogy to these results in the field and laboratory, the development of self-levelling screeds is classified as an intermediate level of performance. Contributed to sustainability, as it uses the waste generated by the industry, and in reducing the weight on buildings.