Avaliação do desempenho acústico de argamassas de contrapiso com substituição do agregado miúdo natural por agregado miúdo de resíduos cerâmicos

Abstract

The reuse of ceramic waste as fine aggregate in mortars has proved to be a promising practice in the field of civil construction, especially with regard to improving the acoustic performance of subfloors. The use of ceramic waste from demolition, industrial waste or the production of ceramics itself has significant environmental and technical benefits, providing a sustainable and efficient alternative in the use of materials. Incorporating this waste into mortars can result in improvements in soundproofing properties, helping to reduce noise pollution and providing quieter, more comfortable environments. In addition, this practice contributes to reducing the volume of waste disposed of in landfills, saving natural resources and minimizing environmental impacts. The aim of this study was to carry out a comparative analysis of the acoustic performance of screeds with different proportions of natural aggregate replaced by ceramic waste. For the acoustic performance tests, four levels of substitution were considered in the screed mortars: 0, 25, 50 and 100%. The evaluation followed the procedures established in standard NBR 16283 (ABNT, 2018) and was conducted at the Construction Technology Laboratory of the University of Caxias do Sul. Three types of screed were used, with different thicknesses (25, 35 and 45 mm). By using different substitution levels in the mortars, it was possible to see equal workability with higher water/cement ratios. In the hardened state, there were higher mechanical strengths in both traction and flexion. Finally, the acoustic performance tests using impact noise showed good results when the aggregates were completely replaced. It is therefore possible to incorporate the ceramic material into the screed mortar, replacing the natural aggregate and reusing a material that is residue. [resumo fornecido pelo autor]