Elevated temperature performance of reinforced concrete beams containing waste polypropylene fibers

Rasoul, Zainab M. R. Abdul; Radhi, Mushtaq Sadiq; Alsaad, Aymen J.; Muhannad, Haider

doi:10.1016/j.csite.2020.100705

Cited by 18 publications

(5 citation statements)

References 25 publications

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“…The temperature inside the burning furnace was controlled manually and was measured using thermocouples. The temperature was gradually raised to 500 ºC within around 2 hours (the program of burning was adapted from previous works [23,24]), and when it reached the required temperature, some specimens collapsed. After that, the furnace was left to cool for the rest of the day.…”

Section: Specimens Preparationmentioning

confidence: 99%

Elevated Temperatures Impact on the Mechanical Behavior of Reactive Powder Concrete Containing Hybrid Fibers

Abdul Rasoul,

مشتاق صادق راضي,

Mahmmod

et al. 2022

JOPAS

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Reactive Powder Concrete (RPC) is a combined material that will allow the concrete industry to enhance material consumption, produce economic benefits, be more durable, and be more environmentally friendly. Due to the highly dense microstructure of RPC, it performs poorly at high temperatures due to the formation of high pore pressure, which causes material breakdown. This paper demonstrates the outcomes of an investigational study of the behavior of six RPC mixes incorporating hybrid steel and plastic waste (polypropylene) fibers after being subjected to high temperatures of up to 500 ºC. Residual compressive strength, residual splitting strength, and density were performed for all the RPC mixes. The results demonstrate that the drop in the compressive strength of RPC is greater than the reduction in their corresponding splitting strength. Furthermore, within a temperature range of about 500 ºC, this mechanical strength showed a noticeable decrease. The decrement of splitting strength ranged between about 8% to 33% . Steel and polypropylene fibers also improve the residual strength of RPC samples. On the basis of these results, a mix containing mixed fibers (25 % steel and 75 % polypropylene) is recommended as appropriate for extreme temperature applications.

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Section: Specimens Preparationmentioning

confidence: 99%

Elevated Temperatures Impact on the Mechanical Behavior of Reactive Powder Concrete Containing Hybrid Fibers

Abdul Rasoul,

مشتاق صادق راضي,

Mahmmod

et al. 2022

JOPAS

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“…These fibers have also exhibited positive effects on structures such as shotcrete covers in tunneling and double-sided slabs [11,12], resulting in improved performance, reduced cracking, and better behavior during substantial deformations. Moreover, using polypropylene fibers in fire-damaged reinforced concrete structures has revealed a 20% reduction in the bearing capacity of concrete materials and bending capacity [13,14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Seismic Performance of RC Moment Resisting Frames

Esfandiari,

Roudsari,

Esfandiari

2024

Period. Polytech. Civil Eng.

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The rehabilitation of concrete structures has been a subject of extensive investigation, exploring various facets. One such avenue involves the incorporation of fiber additives into concrete materials. In parallel, the construction of reinforced concrete structures inevitably encounters construction errors, necessitating constant efforts from researchers to devise solutions for mitigating their impact. In the context of this research, a series of experiments was conducted involving the construction and testing of five reinforced concrete moment-resisting frames. The initial sample served as the control, while two additional samples were integrated with polypropylene and metal fibers. The subsequent two samples deliberately introduced a manufacturing error through the application of air-entraining admixture materials at the beam-to-column connection. This deliberate error aimed to assess the influence of additive fibers on frames affected by manufacturing errors. Several critical parameters were subjected to evaluation, including ultimate strength, stiffness, ductility, energy dissipation capacity, and strength reduction factor. The results of these assessments demonstrated that the utilization of additive fibers contributes to an enhanced overall performance of the frames, as inferred from the aforementioned seismic parameters. Furthermore, it was established that the incorporation of these additive fibers substantially alleviates the impact of manufacturing errors on moment-resisting reinforced concrete frames. Although a significant reduction in energy dissipation capacity was observed in samples with manufacturing errors, the other seismic parameters remained relatively unaffected. Subsequently, numerical models were generated in ABAQUS software to validate the experimental findings, and their outcomes were compared with the results derived from the physical experiments.

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“…In short, most of the previous research works cover the material properties of concrete under high temperature and structural element behavior under high temperature. However, previous studies fail to address the influence of the concrete cover thickness in compression and flexural structural members under the combined effect of elevated temperature and structural loads (Abdul Rasoul et al ., 2020). The member's safety limit under the combined effect of elevated temperature and structural loads was not addressed.…”

Section: Introductionmentioning

confidence: 99%

Study on optimum concrete cover thickness in RC beam and columns under high temperature

Vishal

Satyanarayanan²

2023

JSFE

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PurposeThis study delineates the effect of cover thickness on reinforced concrete (RC) columns and beams under an elevated fire scenario. Columns and beams are important load-carrying structural members of buildings. Under all circumstances, the columns and beams were set to be free from damage to avoid structural failure. Under the high-temperature scenario, the RC element may fail because of the material deterioration that occurs owing to the thermal effect. This study attempts to determine the optimum cover thickness for beams and columns under extreme loads and fire conditions.Design/methodology/approachCover thicknesses of 30, 40, 45, 50, 60 and 70 mm for the columns and 10, 20, 25, 30, 35, 40, 50, 60 and 70 mm for the beams were adopted in this study. Both steady-state and transient-state conditions under thermomechanical analysis were performed using the finite element method to determine the heat transfer through the RC section and to determine the effect of thermal stresses.FindingsThe results show that the RC elements have a greater influence on the additional cover thickness at extreme temperatures and higher load ratios than at the service stages. The safe limits of the structural members were obtained under the combined effects of elevated temperatures and structural loads. The results also indicate that the compression members have a better thermal performance than the flexural members.Research limitations/implicationsNumerical investigations concerning the high-temperature behavior of structural elements are useful. The lack of an experimental setup encourages researchers to perform numerical investigations. In this study, the finite element models were validated with existing finite element models and experimental results.Practical implicationsThe obtained safe limit for the structural members could help to understand their resistance to fire in a real-time scenario. From the safe limit, a suitable design can be preferred while designing the structural members. This could probably save the structure from collapse.Originality/valueThere is a lack of both numerical and experimental research works. In numerical modeling, the research works found in the literature had difficulties in developing a numerical model that satisfactorily represents the structural members under fire, not being able to adequately understand their behavior at high temperatures. None of them considered the influence of the cover thickness under extreme fire and loading conditions. In this paper, this influence was evaluated and discussed.

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Elevated temperature performance of reinforced concrete beams containing waste polypropylene fibers

Cited by 18 publications

References 25 publications

Elevated Temperatures Impact on the Mechanical Behavior of Reactive Powder Concrete Containing Hybrid Fibers

Elevated Temperatures Impact on the Mechanical Behavior of Reactive Powder Concrete Containing Hybrid Fibers

Experimental and Numerical Investigation of the Seismic Performance of RC Moment Resisting Frames

Study on optimum concrete cover thickness in RC beam and columns under high temperature

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