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Bond behaviour between recycled aggregate concrete and deformed steel bars

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Abstract

The results of thirty pullout tests carried out on 8 and 10 mm diameter deformed steel bars concentrically embedded in recycled aggregate concrete designed using equivalent mix proportions with coarse recycled concrete aggregate (RCA) replacement percentages of 0, 25, 50, 75 and 100 % are reported towards investigation of bond behaviour of RCA concrete. Bond strengths of the natural aggregate concrete and the RCA concrete was found to be comparable, particularly for the 10 mm rebars, and the RCA replacement percentage had an insignificant effect on peak bond stress values. However, for both the bar sizes, when the measured bond strengths were normalized with the respective compressive strengths, then the normalized bond strengths so obtained across all the RCA replacement percentages were higher for the RCA concrete compared to the natural coarse aggregate concrete. Further, higher normalized bond strength values were obtained for the 8 mm rebars compared to the 10 mm bars. An empirical bond stress versus slip relationship between RCA concrete and deformed steel bars has been proposed on the basis of regression analysis of the experimental data and it is conservatively suggested that anchorage lengths of 8 and 10 mm diameter deformed bars in RCA concrete may be taken the same as in natural aggregate concrete.

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Abbreviations

d :

Nominal rebar diameter

l :

Embedded length

f c′:

Cylinder compressive strength of concrete

P max :

Peak load

τ max :

Peak bond stress

τ r,max :

Normalized bond strength

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Acknowledgments

The support and cooperation of the staff of the concrete laboratory at the department of civil engineering, I.I.T. Roorkee, Roorkee, for this experimental investigation is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India

    M. John Robert Prince & Bhupinder Singh

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  1. M. John Robert Prince
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  2. Bhupinder Singh
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Correspondence to Bhupinder Singh.

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Prince, M.J.R., Singh, B. Bond behaviour between recycled aggregate concrete and deformed steel bars. Mater Struct 47, 503–516 (2014). https://doi.org/10.1617/s11527-013-0075-8

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