Concrete produced with recycled aggregates for the use in structures

Title: Concrete produced with recycled aggregates for the use in structures
Author(s): P.C.C. Gomes, J.J.L. Tenório and C.C. Rodrigues
Paper category : conference
Book title: 2nd International RILEM Conference on Progress of Recycling in the Built Environment
Editor(s): V.M. John, E. Vazquez, S.C. Angulo, C. Ulsen
e-ISBN: 978-2-35158-122-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 309 - 319
Total Pages: 11
Nb references: 20
Language: English

Abstract: The mechanical and durable properties of recycled aggregate concrete (RAC) are evaluated for the use in concrete structures. A special attention was given to the specific mass of the recycled coarse aggregates. It is understood that this property is related to the resistence and porosity of the aggregate, and this property has direct influence in the mechanical properties of the concrete. The construction and demolition wastes (CDW), which give origin to recycled aggregates, were divided into fine and coarse aggregates. Besides this, a recycled coarse aggregate of a specific mass with a greater density was obtained by mixing the recycled aggregates of the CDW with the recycled aggregates of the concrete wastes (CW).
The concretes were produced in laboratory by combining three water-cement ratios with each recycled coarse aggregates and recycled fine aggregates or river sand, and the reference concrete was produced with natural aggregates. It was observed that recycled aggregates can be used in structural concrete. In general, the use of recycled coarse aggregate in combination with recycled fine aggregates it did not give good results, but when the less porous, or the recycled coarse aggregate of a specific mass with a greater density , was used, the properties of the concrete improved. Some RAC reached bigger strengths than the reference concrete.

Online publication: 2012-02-08
Publication type : full_text
Public price (Euros): 0.00