According to the ABNT / NBR 15575: 2013 standard which deals with normalizing the performance in buildings, in which one of the criteria deals with acoustic performance, the need to adapt to the new rules has arisen in the civil construction market. The acoustics of the environment are directly related to the comfort and well-being of users of the place, especially when it comes to vertical dwellings. In order to mitigate the main noise present in these circumstances, the impact noise, there are several alternatives on the market that bring excellent acoustic gains. However, such alternatives considerably burden buildings, due to the cost of the acoustic material and the specialized labor, generally necessary in its application. In this sense, this work seeks to develop a way to achieve coherent acoustic gains according to that standard, so that it is a cheaper and easier application to be used in low cost buildings. The purpose of this work is the use of crushed rubber from the tire recycling process as material added to the underfloor, during its manufacturing process. In the construction process, a certain percentage of sand is replaced by crushed rubber in the composition of the concrete alloy, aiming at the acoustic gains. For this, specimens were analyzed on a bench capable of carrying out impact noise experiments, following the procedures recommended by the NBR 15575 standard, in order to verify the relevance of the material for such purpose. In conclusion, it is expected that the use of a counter floor with aggregated material can be an economically viable alternative in civil construction in order to adapt the new developments to the values stipulated in the norm.
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