Abstract
In the last two decades, sustainable environmental solutions, whether retrofitting or recycling, are consistently related to concrete structures. This study experiments with the flexural behavior of RC beams voided by waste plastic bottles, which are installed at the mid-height of such beams utilizing a hollow voided tube (i.e., waste plastic bottles wrapped within a hollow steel mesh tube). At a specific point along the depth of the cross-sectional area (at the neutral axis), the bending stresses are at their lowest and are equal to zero. Consequently, voiding this zone has a small influence on some mechanical properties. Therefore, eight beams were prepared and tested with the following tested variables: the presence of voids, beam depth, type and ratio of reinforcing bar (steel and GFRP). A determination of the maximum load, deflection, ductility index, and flexural stiffness was obtained. It is found that the voided specimen with conventional steel reinforcement (S.T20.Vo), which has the same amount of concrete as the solid specimen (S.T17.So.) but a higher depth, has 10.75% greater load resistance, while the voided specimen reinforced with GFRP bars (G.T20.Vo) has 27.1% higher load resistance than a solid specimen (G.T17.So.). In addition, the area of reinforcement has the potential to influence the ductility of the tested specimens to reduce the impact of the section’s hollow-to-ductile failure.
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Abbreviations
- RC:
-
Reinforced concrete
- GFRP:
-
Glass fiber-reinforced plastics
- MPa:
-
Mega pascal
- PET:
-
Polyethylene terephthalate
- OPC:
-
Ordinary Portland cement
- ASTM:
-
American Society for Testing and Materials
- ACI:
-
American Concrete Institute
- P cr :
-
Cracking load
- Pu:
-
Ultimate load
- ∆cr :
-
Deflection at first cracking of concrete
- ∆y :
-
Deflection at first yielding of steel
- ∆u :
-
Deflection at ultimate load
- \({M}_{\mathrm{cr}}\) :
-
Cracking moment
- K :
-
Average flexural stiffness
- \({A}_{t}\) :
-
The area of the transformed section
- n :
-
Modular ratio
- Pcr:
-
Cracking load
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Ali, Z.M., Mahmoud, A.S., Mohammed, M.S. et al. Structural behavior of voided reinforced concrete beams having a novel tact bundled waste plastic bottles. Innov. Infrastruct. Solut. 8, 237 (2023). https://doi.org/10.1007/s41062-023-01205-7
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DOI: https://doi.org/10.1007/s41062-023-01205-7