Análise da substituição parcial do agregado graúdo no concreto por resíduo da construção civil.

Abstract

Civil construction has a high consumption of materials, making it a major generator of environmental impacts. Therefore, it has hit the environment hard, whether through mining to manufacture these materials, or through incorrect disposal of the waste generated. Given this situation, the search for alternative materials for its composition has become increasingly interesting. Therefore, this work aims to study the partial replacement of coarse aggregate with construction and demolition waste (CDW) in concrete production. Initially, the physical characterization of the materials was carried out, and then specimens were molded with replacement by CDW with percentages of 15 %, 30 % and 50 %, and the slump test conditions were investigated, to be ruptured after 7 days, 14 days and 28 days to check the resistance to simple compression. Concrete with 15 % CDW had a slump test slump of 80 mm, that with 30 % had a slump of 80 mm, and that with 50 % had 100 mm, they presented an average compressive strength of 16.54 MPa, 15.07 MPa, and 13.24 MPa, respectively. Therefore, it was inferred that due to the porosity of the CDW aggregates, a drop in resistance to simple compression was obtained when compared to the specimen with natural aggregate. However, the altered concrete presented environmental viability and could be used in construction processes without structural purposes, such as sidewalks, pedestrian plazas, curbs, drainage elements, fence blocks, among others, thus reducing the environmental impacts caused by mining. of this raw material, and due to inadequate disposal.