Comminution and sizing processes of concrete block waste as recycled aggregates

Autor(es)

Gomes, P. C. C. ; Ulsen, C. ; Pereira, F. A. ; Quattrone, M. ; Angulo, S. C.

• Tipo de documento: Artigo Científico
• Fonte: WASTE MANAGEMENT; v. 45, p. 9-pg., 2015-11-01.

Resumo

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. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/15195-9 - Melhoria do desempenho de agregados reciclados mistos de RCD por tratamento térmico e superficial
• Beneficiário: Marco Quattrone
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/25496-6 - Estratégias para a formulação ecoeficiente de concretos secos com agregados reciclados
• Beneficiário: Sérgio Cirelli Angulo
• Modalidade de apoio: Auxílio à Pesquisa - Regular