Proposta de índice de geração de resíduo na execução de instalações elétricas embutidas em alvenaria

Abstract

The most produced fraction of construction and demolition waste can be used as aggregates. One of the activities that contributes to this generation is to chase walls to inlay electrical installations in masonry. It is proposed to analyse the generation of waste in the inlay of electrical installations in hollow clay bricks masonry in construction works and to propose an index of generation of waste for this activity. The studyconsisted of data collection in residential buildings in construction and experimental data collection with a real-scale wall construction. In laboratory, five different configurations of walls and three tools were used to execute the wall chasing: milling cutter, marble saw and cold chisel. With the results of this research was calculated the rate of waste generation of 26,5 ± 2,6 kg/m² of trait. As for productivity, the tools presented differences of up to 14 times in relation to the execution time of a meter of trait. The waste from the milling cutter showed the smallest maximum size of the aggregate and the largest bulk density, followed by the waste resulting from marble saw and cold chisel. The marble saw and cold chisel waste samples had around 78% of its composition in the coarse aggregate grain size range. The milling cutter waste samples was the finest and presented on average 60% of its composition in the fine aggregate grain size range. It is concluded that the tools used to chase the masonry have influence on the size of the waste, time of execution and the amount of waste generated, however they have no influence on the generation rate (kg/m²). The data found in this work, applied to a case study, reveal that the chase of walls for electrical installations in masonry can be responsible for significant amount in the generation of construction waste, mainly by using the cold chisel.