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Flexural behavior of reinforced recycled aggregate concrete beams under short-term loading

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Abstract

Recycling of waste concrete is one of the sustainable solutions for the growing waste disposal crisis and depletion of natural aggregate sources. As a result, recycled concrete aggregate (RCA) is produced, and so far it has mostly been used in low-value applications such as for the pavement base. But, from the standpoint of promoting resource and energy savings and environmental preservation, it is essential to study whether a concrete made of recycled aggregates—recycled aggregate concrete (RAC) can be effectively used as a structural material. The experimental research presented in this paper is performed in order to investigate the flexural behavior of RAC beams when compared to the behavior of natural aggregate concrete (NAC) beams under short-term loading and consequently the possibility of using RAC in structural concrete elements. Three different percentages of coarse RCA in total mass of coarse aggregate in concrete mixtures (0 %—NAC, 50 %—RAC50, and 100 %—RAC100), and three different reinforcement ratios (0.28, 1.46, and 2.54 %) were the governing parameters in this investigation. Full-scale tests were performed on nine simply supported beams until the failure load had been reached. Comparison of load-deflection behavior, crack patterns, service deflections, failure modes and ultimate flexural capacity of NAC and RAC beams was made based on our own and other researchers’ test results. The results of conducted analysis showed that the flexural behavior of RAC beams is satisfactory comparing to the behavior of NAC beams, for both the service and ultimate loading. It is concluded that, within the limits of this research, the use of RAC in reinforced concrete beams is technically feasible.

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Acknowledgments

The work reported in this paper is a part of the investigation within the research project TR36017 “Utilization of by-products and recycled waste materials in concrete composites in the scope of sustainable construction development in Serbia: investigation and environmental assessment of possible applications”, supported by the Ministry for Science and Technology, the Republic of Serbia. This support is gratefully acknowledged.

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  1. Faculty of Civil Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11000, Belgrade, Serbia

    Ivan S. Ignjatović, Snežana B. Marinković, Zoran M. Mišković & Aleksandar R. Savić

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  1. Ivan S. Ignjatović
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  2. Snežana B. Marinković
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  3. Zoran M. Mišković
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  4. Aleksandar R. Savić
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Correspondence to Ivan S. Ignjatović.

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Ignjatović, I.S., Marinković, S.B., Mišković, Z.M. et al. Flexural behavior of reinforced recycled aggregate concrete beams under short-term loading. Mater Struct 46, 1045–1059 (2013). https://doi.org/10.1617/s11527-012-9952-9

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  • DOI: https://doi.org/10.1617/s11527-012-9952-9

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