Performance estimation for concretes made with recycled aggregates of construction and demolition waste of some Brazilian cities

• Main Authors: Antonio Eduardo Bezerra Cabral, Valdir Schalch, Denise Carpena Coitinho Dal Molin, José Luis Duarte Ribeiro
• Format: Article
• Language: English
• Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2012-12-01
• Series: Materials Research
• Subjects: CDW; waste variability; recycled aggregate; concrete
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000600030

The aim of this paper is to verify the influence of composition variability of recycled aggregates (RA) of construction and demolition wastes (CDW) on the performance of concretes. Performance was evaluated building mathematical models for compressive strength, modulus of elasticity and drying shrinkage. To obtain such models, an experimental program comprising 50 concrete mixtures was carried out. Specimens were casted, tested and results for compressive strength, modulus of elasticity and drying shrinkage were statistically analyzed. Models inputs are CDW composition observed at seven Brazilian cities. Results confirm that using RA from CDW for concrete building is quite feasible, independently of its composition, once compressive strength and modulus of elasticity still reached considerable values. We concluded the variability presented by recycled aggregates of CDW does not compromise their use for concrete building. However, this information must be used with caution, and experimental tests should always be performed to certify concrete properties.