Crack Width and Propagation in Recycled Coarse Aggregate Concrete Beams Reinforced with Steel Fibres

Ghalehnovi, Mansour; Karimipour, Arash; Brito, Jorge de; Chaboki, Hamid Reza

doi:10.3390/app10217587

Cited by 30 publications

(11 citation statements)

References 52 publications

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“…The crack evolution of beams could be divided into three stages during the loading process: (1) after the beam cracking, the cracks developed rapidly along the height of beam section and the number of cracks increased as the load increased (2) with the increase of load, the shear cracks appeared in the shear span of beam and the crack propagation rate in the pure bending section of beam was slowed down; (3) after the tensile reinforcement yielded, there were no new cracks emerged and the main cracks propagated rapidly, and the concrete in the compression zone was crushed until beam failed. It could be seen from Figure 4 that the crack pattern of the concrete beam with RFA replacement ratio of 100% was similar to that of ordinary concrete beam, and the cracks of SFRAC beam became fine and dense with the increase of steel fiber volume fraction, which is in agreement with the results found by Ghalehnovi (Ghalehnovi et al, 2020). For SFRAC beams, the crack spacing and crack numbers did not change significantly as the RA replacement ratios increased (Evangelista and Brito, 2017).…”

Section: Resultssupporting

confidence: 88%

Flexural capacity prediction of steel fiber reinforced concrete beam with recycled fine and coarse aggregate

Zhu

Yang

2023

Advances in Structural Engineering

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In this study, the flexural performance of the steel fiber reinforced concrete beams with recycled fine and coarse aggregates was investigated through the experiments. The effects of steel fiber volume fraction, recycled fine and coarse aggregate replacement ratio, and concrete compressive strength grade on the flexural performance of steel fiber reinforced recycled aggregate concrete (SFRAC) beams were systematically studied in terms of failure mode, flexural capacity, cracking patterns, load-deflection response, and load-tensile reinforcement strain response. The results showed that the flexural capacity and deflection of beams increased and decreased with the increase of steel fiber volume fraction, respectively. The beam with 100% replacement ratio of recycled fine aggregate and 0.5% volume fraction of steel fiber presented the similar or even better flexural performance than that of the ordinary concrete beam. By adding 1.0% volume fraction of steel fiber, the flexural capacity of beam with both 100% replacement ratio of recycled fine and coarse aggregates was higher than that of the ordinary concrete beam. Based on the experimental results of SFRAC beams in this study and other literature, the effects of steel fiber volume fraction and recycled aggregate replacement ratio on the flexural capacity of beams were quantitatively analyzed. Lastly, a model for the prediction of SFRAC beam flexural capacity was proposed and verified.

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Section: Resultssupporting

confidence: 88%

Flexural capacity prediction of steel fiber reinforced concrete beam with recycled fine and coarse aggregate

Zhu

Yang

2023

Advances in Structural Engineering

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“…Therefore, recycled coarse aggregates (RCA) and other waste materials aid in conserving natural resources and can be utilized to make concrete elements as a substitute for cement or natural coarse aggregates (NCA). In this regard, the structural performance of concrete members made from various recycled materials has been studied in a variety of ways 18–23 . Breccolotti and Materazzi 24 investigated the eccentrically loaded performance of RCA‐RC columns experimentally and numerically.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, the structural performance of concrete members made from various recycled materials has been studied in a variety of ways. [18][19][20][21][22][23] Breccolotti and Materazzi 24 investigated the eccentrically loaded performance of RCA-RC columns experimentally and numerically. Also, the effect of concrete compressive strength on the performance of RCA concrete was measured experimentally, and it revealed that RCA had a larger scattering in the compressive resistance.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of GFRP‐reinforced concrete columns made with waste aggregates under concentric and eccentric loads

Pour

Shirkhani

Kırgız

et al. 2022

Structural Concrete

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Nowadays, reducing the waste and recycled material resources in nature and environmental protection, as well as reducing the use of natural resources, has gained the attention of engineers and researchers. One of the ways to reach this goal is to use waste and recycled materials in new concrete members' construction. Additionally, using glass fiber-reinforced polymer (GFRP) rebars has gained high consideration owing to their advantages such as high tensile strength and corrosion resistance. Therefore, this study aims to measure the influence of recycled coarse aggregates (RCA) on the structural performance of reinforced concrete (RC) columns reinforced by GFRP rebars under concentric and eccentric loading conditions. A total of 24 RC columns were cast and subjected to concentric and eccentric loads with different eccentricity ratios (e/h):0 (no eccentricity), 0.25 (moderate eccentricity), and e/h = 0.5 (high eccentricity). A total of 18 columns were strengthened with longitudinal GFRP rebars, and six specimens were considered control samples reinforced by steel rebars. RCA was used at two contents of 0% and 100% in terms of weight as a substitute for natural coarse aggregates (NCA). In addition, to measure the influence of transverse reinforcement, three different spacings were considered: 60, 120, and 180 mm. Evaluation of axial behavior, the strain of rebars and concrete, and the ductility were the main aims of this study. Moreover, a comparison between the experimental results and existing standards was carried out. Findings revealed the adequate axial resistance of specimens when RCA was used. Therefore, RCA incorporation improved the axial resistance of GFRP-RC columns by about 25% and 35% when the stirrup spacing declined by 60 and 120 mm, respectively in comparison with the same specimens made with NCA. However, the influence of RCA on the RC columns' axial behavior was declined by raising the eccentricity distance.Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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“…Recently, many types of fibre reinforced concrete (FRC), including steel and synthetic materials, have been investigated to serve as a material that can partially or fully substitute for RC in structures [17][18][19][20][21][22]. In particular, steel fibre reinforced concrete (SFRC) is becoming increasingly used in structures because it has advantages over RC in terms of increasing cracking resistance and residual strength of cracked concrete due to the fibres bridging effect [23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Design Study of Steel Fibre Reinforced Concrete Shaft Lining for Swelling Ground in Toronto, Canada

Kim

Lee

2021

Applied Sciences

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Reinforced concrete (RC) is a widely used construction material around the world. RC has many advantages in terms of structural stability. However, the reinforcement of RC requires extensive labour costs. Steel fibre reinforced concrete (SFRC) has been widely studied to replace steel bars in concrete structures over the decades. However, most underground structures, such as tunnel lining, are usually designed using conventional RC for long-term stability due to unexpected geotechnical characteristics, such as directional and depth-dependent varied lateral pressure, earthquakes, groundwater, and time-dependent swelling behaviour. In this paper, an alternative design of shaft structure using SFRC, based on the original RC designed data in the Toronto region, was studied to evaluate the feasibility of SFRC replacing conventional RC. A key geological feature of the site is that the bedrock is comprised of Georgian Bay shale, which exhibits long-term time-dependent deformation (TDD). The capacities of RC and SFRC for the shaft lining were calculated based on the Canadian concrete design codes CSA A23.3 and RILEM TC 162-TDF, to assess the benefit of adding steel fibre, and several analytical solutions were used to calculate the applied load on the lining. A specialised TDD constitutive model in Fast Lagrangian Analysis of Continua (FLAC) 2D was developed to estimate whether the optimum installation time of the shaft lining, based on the geological reports, is appropriate under swelling behaviour, and evaluate the resultant long-term stability. The calculated hoop thrust and bending moment for several loading cases were within the capacity of the SFRC shaft lining. The numerical analysis demonstrated that the proposed lining installation time could be reduced, despite consideration of the long-term TDD behaviour.

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Crack Width and Propagation in Recycled Coarse Aggregate Concrete Beams Reinforced with Steel Fibres

Cited by 30 publications

References 52 publications

Flexural capacity prediction of steel fiber reinforced concrete beam with recycled fine and coarse aggregate

Flexural capacity prediction of steel fiber reinforced concrete beam with recycled fine and coarse aggregate

Experimental investigation of GFRP‐reinforced concrete columns made with waste aggregates under concentric and eccentric loads

Design Study of Steel Fibre Reinforced Concrete Shaft Lining for Swelling Ground in Toronto, Canada

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