Abstract
The building industry has a large environmental impact. The replacement of natural aggregates by residues in cement composites it is an alternative. By another side, acoustic performance is very important to provide comfort to the users, and it is still more important in Covid-19’ outbreak, because people stay much more time at home. There are some requirements in the standards for the evaluation of construction systems to be used in vertical buildings and the effects of waste in building materials need to be verified. The aim of this study is to analyse the impact on sound insulation of mortar subfloors produced with the replacement of 50% of the fine aggregate by rice husk. It was applied three types of coatings of common use in the local buildings: porcelain, vinyl, and laminated wood. The tests were carried out on reduced samples of subfloors with 1 m² of surface area and thickness of 5 cm in laboratory environment, following the requirements of ISO 10140-3:2010. It was verified that the substitution of the fine aggregate by rice husk did not present significant variations in the attenuation of the sound transmission in relation to the conventional subfloor. These results could be viewed as positive since the use of waste as a substitute for natural resources and could to contribute to the advance of sustainability in the construction sector.
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