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Influence of the diameter of the bar and CDW content on the bond behavior of recycled reinforced concrete



Title: Influence of the diameter of the bar and CDW content on the bond behavior of recycled reinforced concrete
Author(s): C.N.S. Reis, M.B. Leite and P.R.L. Lima
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: 207 - 214
Total Pages: 8
Nb references: 10
Language: English


Abstract: The bond behavior between the concrete and the steel rebars is a fundamental parameter for perfect operation of the reinforced concrete, which happens due to three aspects: physical-chemistry adhesion; mechanical anchorage, and friction resistance. The recycled concrete, containing construction and demolition waste (CDW), presents physical, mineralogical and mechanical behavior characteristics different from the conventional concrete which can affect its bond behavior with the steel rebars. To use recycled reinforced concrete in a safe way it becomes necessary, therefore, the evaluation of the bond behavior of recycled concrete and steel rebars. In the present work it was evaluated the influence of the recycled fine aggregate (RFA) in steel-concrete bond through experimental analyses based on the pullout tests prescribed by RILEM. RFA replacement used at this study was 0, 25 and 50% by weight of natural aggregate. Two steel rebars diameters of 10.0 and 16.0mm of a CA-60 were still evaluated. The concrete mixture was designed to achieve 38MPa at 28 days age. The results show that the bond between recycled concrete and steel rebars decrease with an increase of the RFA replacement rate and rebar diameter.


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