Application of Construction and Demolition Waste in Civil Construction in the Brazilian Amazon-Case Study of the City of Rio Branco

• Published in: Materials Vol. 14; no. 9; p. 2247
• Main Authors: Souza, Fernando da Silva, Carvalho, José Maria Franco de, Silveira, Gabriela Grotti, Araújo, Vitória Cordeiro, Peixoto, Ricardo André Fiorotti
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 27-04-2021; MDPI
• Subjects: Adhesive strength; Aggregates; Amazon region; Cement; Chloride resistance; Cities; Concrete; Construction; construction and demolition waste; Construction industry; Construction sites; Demolition; eco-efficient cement composite; GDP; Gross Domestic Product; Landfill; Masonry construction; Mortars (material); Penetration resistance; Performance evaluation; Raw materials; recycled aggregate; Recycling; Sustainable development; Waste disposal; Brazil; Rio de Janeiro Brazil; Amazon Basin; United States > US; Germany; construction and demolition waste; recycled aggregate; sustainable development; eco-efficient cement composite; Amazon region
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma14092247

The lack of usable aggregates for civil construction in Rio Branco (capital of Acre, a Federal State in the Amazon region) makes the production and use of recycled aggregates from construction and demolition waste (CDW) an alternative of great interest. In this study, a comprehensive characterization of CDW collected from 24 construction sites of six building types and three different construction phases (structures, masonry, and finishing) was carried out. The fine and coarse recycled aggregates were produced and evaluated in 10 different compositions. The aggregates' performance was evaluated in four mixtures designed for laying and coating mortars with a total replacement of conventional aggregates and a mixture designed for a C25 concrete with 50% and 100% replacement of conventional aggregates. CDW mortars showed lower densities and greater water retention, initial adhesion, and mechanical strength than conventional mortars. CDW concretes presented lower densities and greater resistance to chloride penetration than conventional concrete, with a small mechanical strength reduction. The recycled CDW aggregates proved to be technologically feasible for safe application in mortars and concrete; for this reason, it is believed that the alternative and proposed methodology is of great interest to the Amazonian construction industry, considering the high costs of raw materials and the need for defining and consolidating a sustainable development model for the Amazon region.