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Bond behaviour of reinforcing bars in self-compacting concrete: experimental determination by using beam tests

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Abstract

The force transfer between concrete and reinforcement depends on the bond characteristics between the two materials. Bond influences crack widths and the deflections of RC members and also determines anchorage and splice lengths. Self-compacting concrete (SCC) is characterized by a smaller amount of coarse aggregates when compared to conventional vibrated concrete. To investigate whether this change in mix design has a significant influence on the bond behaviour, a series of beam tests (according to RILEM recommendation RC6) was performed. A total of 36 specimens were cast using 3 different concrete types: one conventional vibrated concrete (CVC) and two powder-type SCC’s. The bond stress—slip behaviour of reinforcing bars with diameters ranging from 12 to 40 mm has been recorded. From these tests, it can be concluded that the bond strength of SCC is even higher than it is for CVC for small bar diameters, but the difference becomes smaller for larger bar diameters.

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Abbreviations

ϕ:

Reinforcement bar diameter, mm

σs :

Tensile stress in the reinforcing bar, N/mm2

τM :

Characteristic value of the bond strength, N/mm2

τR :

Ultimate bond strength, N/mm2

τR,n :

Normalised ultimate bond strength, N/mm2

CVC:

Conventional vibrated concrete

DEV:

Standard deviation

f c :

Concrete compressive strength, N/mm2

f ccub :

Concrete cube compressive strength, N/mm2

f ct,fl :

Concrete flexural tensile strength, N/mm2

f ct,sp :

Concrete splitting tensile strength, N/mm2

f R :

Relative rib area of a reinforcing bar

f u :

Ultimate tensile strength of a reinforcing bar, N/mm2

f y :

Yield strength of a reinforcing bar, N/mm2

F s :

Total tensile force in a reinforcing bar, N

k :

Bond length expressed as ‘times the bar diameter ϕ’

l d :

Bond length, mm

P :

Total load applied during the test, N

SCC:

Self-compacting concrete

s u :

Slip corresponding to the ultimate bond strength, mm

References

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Acknowledgements

The authors would like to acknowledge the Fund for Scientific Research in Flanders (FWO) for the financial support of the research project.

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Authors and Affiliations

  1. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Technologiepark-Zwijnaarde 904, Zwijnaarde, 9052, Ghent, Belgium

    Pieter Desnerck, Geert De Schutter & Luc Taerwe

Authors
  1. Pieter Desnerck
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  2. Geert De Schutter
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  3. Luc Taerwe
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Correspondence to Pieter Desnerck.

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Desnerck, P., De Schutter, G. & Taerwe, L. Bond behaviour of reinforcing bars in self-compacting concrete: experimental determination by using beam tests. Mater Struct 43 (Suppl 1), 53–62 (2010). https://doi.org/10.1617/s11527-010-9596-6

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  • DOI: https://doi.org/10.1617/s11527-010-9596-6

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