Reliability of the bond strength of recycled coarse aggregate concrete

João Pacheco, Jorge De Brito, Carlos Chastre, Luís Evangelista

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

An analysis on the effect of the incorporation of coarse recycled concrete aggregates on the bond strength between concrete and embedded steel reinforcement is presented. The model’s uncertainty of the Level I provision of the anchorage length of fib Bulletin 72 on ribbed steel/recycled aggregate concrete bond is quantified. Afterwards, reliability analyses on the bond strength are made and a partial safety factor for the anchorage length of recycled concrete elements is proposed. The model’s uncertainty is evaluated through data from pullout tests, the only type of bond test that has been so far performed extensively on recycled aggregate concrete specimens. The limitations of this test in reproducing the bond of actual structural elements is discussed, and the model’s uncertainty is converted to that of lap splice tests. The bond strength of recycled aggregate concrete design was found to be less reliable than that of natural aggregate concrete, especially in the absence of confining reinforcement. For concrete with full recycled aggregate incorporation, a 25% increase in the anchorage length is proposed. Additional testing on the bond strength of lapped splices or beam-end specimens is recommended.

Original languageEnglish
Title of host publicationProceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures
EditorsWit Derkowski, Piotr Krajewski, Piotr Gwozdziewicz, Marek Pantak, Lukasz Hojdys
PublisherInternational Federation for Structural Concrete (fib)
Pages913-920
Number of pages8
ISBN (Electronic)9782940643004
Publication statusPublished - 2019
Eventfib Symposium 2019: Concrete - Innovations in Materials, Design and Structures - Krakow, Poland
Duration: 27 May 201929 May 2019

Conference

Conferencefib Symposium 2019: Concrete - Innovations in Materials, Design and Structures
CountryPoland
CityKrakow
Period27/05/1929/05/19

Keywords

  • Anchorage length
  • Bond strength
  • Model’s uncertainty
  • Recycled aggregate concrete
  • Reliability analysis

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  • Cite this

    Pacheco, J., De Brito, J., Chastre, C., & Evangelista, L. (2019). Reliability of the bond strength of recycled coarse aggregate concrete. In W. Derkowski, P. Krajewski, P. Gwozdziewicz, M. Pantak, & L. Hojdys (Eds.), Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures (pp. 913-920). International Federation for Structural Concrete (fib).