title: Comminution and sizing processes of concrete block waste as recycled aggregates.
abstract: Due to the environmental impact of construction and demolition waste (CDW), recycling is mandatory. It is also important that recycled concrete aggregates (RCA) are used in concrete to meet market demands. In the literature, the influence of RCAs on concrete has been investigated, but very limited studies have been conducted on how the origin of concrete waste and comminution processes influence RCA characteristics. This paper aims to investigate the influence of three different comminution and sizing processes (simple screening, crushing and grinding) on the composition, shape and porosity characteristics of RCA obtained from concrete block waste. Crushing and grinding implies a reduction of RCA porosity. However, due to the presence of coarse quartz rounded river pebbles in the original concrete block mixtures, the shape characteristics deteriorated. A large amount of powder (<0.15 mm) without detectable anhydrous cement was also generated.
authors.affiliation: Technological Center, University Federal of Alagoas, Campus A.C. Simões, BR 104 Tabuleiro do Martins, Maceió, AL 57.072-970, Brazil.
authors.forename: P C C
authors.initials: PC
authors.lastname: Gomes
authors.affiliation: Department of Mining and Petroleum Engineering, Escola Politécnica, University of São Paulo, Av. Prof. Almeida Prado No. 83, 05508-900, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Ulsen
authors.affiliation: Technological Center, University Federal of Alagoas, Campus A.C. Simões, BR 104 Tabuleiro do Martins, Maceió, AL 57.072-970, Brazil.
authors.forename: F A
authors.initials: FA
authors.lastname: Pereira
authors.affiliation: Department of Construction Engineering, Escola Politécnica, University of São Paulo, Av. Prof. Almeida Prado Travessa 2 No. 83, 05508-070, Brazil.
authors.forename: M
authors.initials: M
authors.lastname: Quattrone
authors.affiliation: Department of Construction Engineering, Escola Politécnica, University of São Paulo, Av. Prof. Almeida Prado Travessa 2 No. 83, 05508-070, Brazil. Electronic address: sergio.angulo@lme.pcc.usp.br.
authors.forename: S C
authors.initials: SC
authors.lastname: Angulo
mesh_terms: D001938:Brazil; D003252:Construction Materials / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis*; D010316:Particle Size; D016062:Porosity; D059027:Recycling / Q000379:methods*; D018505:Waste Management / Q000379:methods*
chemical_list: D007220:Industrial Waste
keywords: Characterization; Comminution; Concrete block waste; Recycled concrete aggregate