Abstract
This paper presents an experimental study on the local bond behaviour of deformed steel rebars in high-strength concrete (HSC) incorporating high-quality recycled concrete aggregate (RCA) produced from a recycling plant in Flanders, Belgium. To examine the influence of the coarse RCA on the local bond behaviour between the rebars and concrete, a total of 5 concrete mixtures (target strength class C50/60) are prepared, in which the replacement percentage of the coarse RCA to the natural aggregate is 0, 10, 20, 50 and 100%, respectively. Deformation controlled pull-out tests with relatively short embedded length (3 times the diameter) of the steel rebars are carried out to investigate the local bond-slip behaviour between the steel rebars and HSC. The test results reveal that the incorporation of the RCA does not have a significant effect on the bond performance between the rebars and concrete. Based on the test data, a new model for predicting the maximum bond stress is proposed. The analytical relationship in fib Model Code 2010 generally agrees well with the measured bond-slip curve, irrespective of the RCA content in the concrete, provided that the measured maximum bond stress is used. A more accurate description of the bond-slip behaviour up to the relative slip of 1.0 mm can be achieved by adjusting the α-value in the equation in fib Model Code 2010.
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Acknowledgements
This research work has been financially support by a start-up funding at KU Leuven, Belgium (No.STG/16/011) and the Lvnong Chair in Construction Waste Recycling at KU Leuven. All the financial supports are sincerely acknowledged. The authors would also like to express their appreciations to O.B.B.C. nv and Willy Naessens Group for supplying the raw materials for the test. The support of Prof. Özlem Cizer and Mr. Danny Uten and the assistance of Mr. Jan Vander Auwera, technical staff at the Reyntjens Laboratory, KU Leuven is much appreciated.
Funding
This study was funded by KU Leuven Internal Funds (grant number STG/16/011), the Lvnong Chair in Construction Waste Recycling at KU Leuven sponsored by Hangzhou Lvnong Environmental Engineering Co. Ltd (grant number VAR-LSLVNG-O2030).
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Sierens, Z., Cai, J., Van Steen, C. et al. Bond performance of deformed steel rebars in HSC incorporating industrially produced recycled concrete aggregate. Mater Struct 54, 50 (2021). https://doi.org/10.1617/s11527-021-01639-4
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DOI: https://doi.org/10.1617/s11527-021-01639-4