Análise do desempenho acústico entre sistemas construtivos de concreto moldado in loco e alvenaria estrutural: estudo de caso

Abstract

Due to the growth of cities and, consequently, of the number of cars and other means of transport that travel through the urban perimeter, the emission of low noise is increasing more and more. The vertical and horizontal growth of cities meant that housing units began to be built closer together, so that space could be used. With that, the study of acoustic performance became very important. The COVID-19 pandemic scenario intensified the permanence of people in their homes. They began to carry out more of their activities at home, practicing the home office frequently. Contributing to this process, in 2013 the ABNT 15575:2021 performance standard came into effect, providing the necessary parameters to achieve acoustic performance. Therefore, this study aims to analyze the acoustic performance of a housing complex, belonging to the Casa Verde e Amarela Program, between two construction systems: cast-in-place concrete and structural masonry. Field measurements were made based on the engineering method presented by NBR 15575-4 (ABNT, 2021), carried out on the twinning wall between the two twinned housing units. For the cast-in-place concrete units, the interrupted noise method was used for the reverberation time; for the structural masonry units, the integrated impulse response method for the reverberation time and the background noise analysis for both construction systems. The energy average of the results and the final verification by the R code were performed. The results obtained, compared to the requirement of the standard, show that, for the cast-in-place concrete units, the acoustic performance was classified as superior. However, for the structural masonry units, there is a need for improvements, so that they meet the standard. Thus, environmental comfort is still a parameter that needs to be improved in certain building systems, aiming at the quality of life of people in their homes.