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Behaviour and Strength Prediction of Reinforced Recycled Aggregate Concrete Columns Confined with CFRP Wraps

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Iranian Journal of Science and Technology, Transactions of Civil Engineering Aims and scope Submit manuscript

Abstract

Detailed experimental investigations were carried out to study the behaviour of confined reinforced concrete (RC) columns cast with recycled aggregate concrete (RAC). For this purpose, RC columns were cast with 0, 30, 50 and 100% replacement of natural coarse aggregates (NCA) with recycled coarse aggregates (RCA) and confinement was provided using externally bonded carbon fibre reinforced polymer (CFRP) wraps. The failure load and failure mode of columns are studied and investigated under uniaxial compression. It is observed that with an increase in the RCA replacement percentages, the peak load of columns decreases. However, no significant difference in the peak loads and overall structural behaviour is found for columns having 30% RCA compared with natural aggregate columns (NAC). Furthermore, it has been observed that the confinement provided by the CFRP wrap can effectively improve the behaviour and ultimate axial load-carrying capacity of the RC column. A significant increase in load-carrying capacity of confined columns is observed when compared with unconfined columns having similar replacement percentages of RCA. The load-carrying capacities of unconfined and confined RC columns are compared with ACI 318-19 and ACI 440.2R-17 codes, respectively. It is found that the equations provided by these standards can be used safely to estimate the load-carrying capacities of RC unconfined and confined columns made with RCA for replacement percentages in the range of 30–50%.

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Acknowledgements

The authors are highly indebted for the assistance provided by the Department of Civil Engineering, NED University of Engineering & Technology, Karachi, Pakistan, and Pakistan Science Foundation (PSF) through Joint Research Project between NSFC and PSF (PSF/NSFC-Eng/S-NED (05)) and Higher Education Commission (HEC), Pakistan through Research Project (NRPU Project # 6051) for conducting this research work.

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Authors and Affiliations

  1. Department of the Civil Engineering, NED University of Engineering and Technology, Karachi, Pakistan

    Asad-ur-Rehman Khan, Shamsoon Fareed & Rida Nasir

  2. Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, China

    Jianzhuang Xiao

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  1. Asad-ur-Rehman Khan
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  2. Shamsoon Fareed
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  3. Rida Nasir
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  4. Jianzhuang Xiao
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Correspondence to Asad-ur-Rehman Khan.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Khan, AuR., Fareed, S., Nasir, R. et al. Behaviour and Strength Prediction of Reinforced Recycled Aggregate Concrete Columns Confined with CFRP Wraps. Iran J Sci Technol Trans Civ Eng 46, 2777–2789 (2022). https://doi.org/10.1007/s40996-021-00779-5

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