Reliability of the bond strength of recycled coarse aggregate concrete

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

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 proceeding › Conference contribution › peer-review

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 language	English
Title of host publication	Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures
Editors	Wit Derkowski, Piotr Krajewski, Piotr Gwozdziewicz, Marek Pantak, Lukasz Hojdys
Publisher	International Federation for Structural Concrete (fib)
Pages	913-920
Number of pages	8
ISBN (Electronic)	9782940643004
Publication status	Published - 2019
Event	fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures - Krakow, Poland Duration: 27 May 2019 → 29 May 2019

Conference

Conference	fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures
Country/Territory	Poland
City	Krakow
Period	27/05/19 → 29/05/19

Keywords

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

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).

Pacheco, João ; De Brito, Jorge ; Chastre, Carlos et al. / Reliability of the bond strength of recycled coarse aggregate concrete. Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures. editor / Wit Derkowski ; Piotr Krajewski ; Piotr Gwozdziewicz ; Marek Pantak ; Lukasz Hojdys. International Federation for Structural Concrete (fib), 2019. pp. 913-920

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title = "Reliability of the bond strength of recycled coarse aggregate concrete",

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{\textquoteright}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{\textquoteright}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{\textquoteright}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.",

keywords = "Anchorage length, Bond strength, Model{\textquoteright}s uncertainty, Recycled aggregate concrete, Reliability analysis",

author = "Jo{\~a}o Pacheco and {De Brito}, Jorge and Carlos Chastre and Lu{\'i}s Evangelista",

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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. International Federation for Structural Concrete (fib), pp. 913-920, fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures, Krakow, Poland, 27/05/19.

Reliability of the bond strength of recycled coarse aggregate concrete. / Pacheco, João; De Brito, Jorge; Chastre, Carlos et al.
Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures. ed. / Wit Derkowski; Piotr Krajewski; Piotr Gwozdziewicz; Marek Pantak; Lukasz Hojdys. International Federation for Structural Concrete (fib), 2019. p. 913-920.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Evangelista, Luís

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N2 - 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.

AB - 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.

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KW - Model’s uncertainty

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Y2 - 27 May 2019 through 29 May 2019

ER -

Reliability of the bond strength of recycled coarse aggregate concrete

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