Abstract
This study encompasses an experimental investigation of twenty beams carried out to investigate the effect of replacing natural coarse aggregate by recycled coarse aggregate in various amounts by weight. Ten beams were shear-reinforced with conventional (i.e., closed) stirrups, while another ten were transversely reinforced using rectangular inclined spiral reinforcement. All beams were subjected to an incremental static loading up to failure, where crack propagations, ultimate deflections, ultimate load values, and failure mechanisms were recorded and examined. Test results revealed that while all beams predominantly failed in shear, those with conventional stirrups exhibited similar behavior to those reinforced with rectangular spiral reinforcement for 25–50% replacement ratios. When higher replacement ratios were used (i.e., 75% and 100%), there was a noticeable deterioration in the ultimate measured shear force for the beams containing spiral reinforcement when compared to those with vertical stirrups.
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Abbreviations
- NCA:
-
Natural concrete aggregates
- Pmax :
-
Maximum load carrying capacity
- RCA:
-
Recycled concrete aggregates
- S:
-
Nominal spacing of stirrups
- V c :
-
Shear strength of a member provided by the concrete
- V max :
-
Maximum shear capacity
- V n :
-
Nominal shear strength
- V s :
-
Shear strength of a member provided by shear reinforcement.
- b :
-
Width of beam cross section
- d :
-
Depth from the extreme compressed fiber to the centroid of the longitudinal reinforcement
- \(A_{{\text{v}}}\) :
-
Area of transverse reinforcement
- \(f^{{\prime }}_{{\text{c}}}\) :
-
Compressive strength of concrete member
- \(f_{{{\text{yt}}}}\) :
-
Corresponding yield strength of the transverse reinforcement
- \(\nu_{{\text{c}}}\) :
-
Shear stress in concrete
- \(\nu_{\exp }\) :
-
Experimental shear stress
- \(\nu_{{\text{n}}}\) :
-
Nominal shear stress
- \(\nu_{{\text{s}}}\) :
-
Shear stress in transverse reinforcement
- \(\rho_{{\text{l}}}\) :
-
Longitudinal reinforcement ratio
- \(\emptyset\) :
-
Inclination angle of transverse reinforcement
- δ max :
-
Maximum deflection at midspan
- λ :
-
A constant that is equal to 1.0 and 0.75 for, respectively, normal and light weight concrete
- \(\theta\) :
-
Measured angle of inclination of the shear cracks
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Acknowledgements
The authors would like to acknowledge the Deanship of Scientific Research at the University of Jordan for their financial support and would like to appreciate the technical support by the Department of Civil Engineering at the University of Jordan.
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Alsabaileh, I., Alqam, M. Shear Behavior of Beams with Recycled Coarse Aggregates Having Rectangular Spiral Reinforcement. Arab J Sci Eng 48, 4865–4878 (2023). https://doi.org/10.1007/s13369-022-07262-x
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DOI: https://doi.org/10.1007/s13369-022-07262-x