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Materials and Structures

, Volume 47, Issue 3, pp 503–516 | Cite as

Bond behaviour between recycled aggregate concrete and deformed steel bars

  • M. John Robert Prince
  • Bhupinder Singh
Original Article

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.

Keywords

Coarse recycled concrete aggregate Replacement percentage Natural coarse aggregate Bond Pullout failure Normalized bond strength 

Abbreviations

d

Nominal rebar diameter

l

Embedded length

fc

Cylinder compressive strength of concrete

Pmax

Peak load

τmax

Peak bond stress

τr,max

Normalized bond strength

Notes

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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Copyright information

© RILEM 2013

Authors and Affiliations

  1. 1.Department of Civil EngineeringIndian Institute of Technology RoorkeeRoorkeeIndia

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