Shear Strength of Reinforced Concrete Beams Made with Recycled
Aggregate

Tabsh, Sami W.; Yehia, Sherif

doi:10.11159/icsenm18.130

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…However, research conducted on the structural behavior of RCA is limited and often contradictory. In general, flexural and shear crack patterns of 100% replacement of recycled aggregate concrete and conventional normal weight concrete are identical; nonetheless, shear capacity in recycled aggregate concrete is relatively less than that of conventional concrete [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Addition of fibers and supplementary cementitious materials was an approach to improve the mechanical properties and flexural strength of recycled aggregate mixes.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Ghoneim

Yehia

et al. 2020

Materials

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In this paper, shear strength of fiber reinforced recycled concrete was investigated. A Self Consolidated Concrete (SCC) matrix with 100% coarse recycled aggregate and different types of fibers were used in the study. Steel (3D and 5D), synthetic and hybrid fibers with a volume fraction of 0.75% were added to the concrete matrix to prepare eight beams. In addition, two beams were cast without fibers as control specimens. All beams were prepared without shear reinforcement and were tested to evaluate concrete contribution to the shear capacity. In addition, optical images were captured to allow for full-field displacement measurements using Digital Image Correlation (DIC). The results showed about 23.44–64.48% improvement in the average concrete shear capacity for fiber-reinforced beams when compared to that of the control specimens. The percentage improvement was affected by fiber type and the steel fiber beams achieved the best performance. The addition of the fiber delayed the crack initiation and improved the post-cracking and ductile behavior of all beams. Moreover, the experimental results were compared to those predicted by codes and proposed equations found in the literature for concrete strength with and without fibers.

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Section: Introductionmentioning

confidence: 99%

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Ghoneim

Yehia

et al. 2020

Materials

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“…Ultimately, this study's overarching goal was to make design recommendations for shear and flexure, encompassing the potential integration of locally produced recycled coarse aggregate within concrete beams. This research builds on the previous work of the senior authors on the subject by greatly extending the experimental and theoretical components of the study [36,37].…”

Section: Rahal and Elsayedmentioning

confidence: 89%

The Structural Behavior of Reinforced Concrete Beams Made with Locally Produced Recycled Aggregate in the UAE

Sagheer,

Tabsh,

Yehia

2023

Buildings

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In this study, the feasibility of utilizing locally produced coarse recycled aggregate (RA) from demolition waste in the UAE for structural applications was investigated. A comprehensive literature review on the subject showed that the shear and flexural responses of reinforced beams utilizing aggregate from concrete demolition waste are greatly dependent on the aggregate replacement ratio and the quality of the recycled aggregate. The experimental program in this study consisted of three phases. Phase I focused on the evaluation of the physical and mechanical characteristics of the RA, Phase II addressed the mix design and fresh and hard properties of the concrete, and Phase III dealt with the flexural and shear behavior of structural members. The research involved twelve 150 mm × 300 mm reinforced concrete beams with a length of 1500 mm or 2000 mm that were made with 0% (control), 50%, or 100% recycled coarse aggregate, replacing natural coarse aggregate (NA). Two target concrete compressive strengths, 25 and 35 MPa, were considered in the investigation. The results showed that the recycled aggregates had lower crushing and LA abrasion values by 40% and 18–28%, respectively, whereas the absorption capacity was 40–300% higher compared to the natural aggregate. In addition, the mechanical properties of the concrete made with different replacement ratios (R%) of RA were either similar or slightly less than those of the control mix. The shear beam tests with fc′ = 25 MPa showed that the 50%- and 100%-replacement-ratio beams demonstrated closely matched normalized shear strength values that exceeded their corresponding NA beam by 12.5%, while the shear beam tests with fc′ = 35 MPa showed that the NA beam exhibited normalized shear strength surpassing the 50% RA and 100% RA beams by 12.5% and 17.5%, respectively. In the flexural beam tests, the flexural strength exhibited minimal disparities for the beams that shared the same RA% but differed in their compressive strength targets, and overall, the variation in the RA% had a marginal impact on the flexural strength of the beams. Further, an increase in the RA% corresponded to an increase in the shear ductility index, which was in contrast with the findings on the flexural ductility index. Furthermore, predictions of flexural strength using the ACI318-19 code and shear strength using the strut-and-tie model yielded comparable results to the experimental ones.

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“…Recently, the use of Recycled Concrete Aggregate (RCA) instead of normal Aggregate (RA) in different proportions in beams to compare the shear strength of reinforced concrete has been widely studied for a variety of reasons, including being more effective, saving material, providing more height at the central span, and being more shear resistant. As shown in research done by Tabsh and Yehia [10], Fathifaz et al [11], Pedro et al [12], and Hamoodi et al [13]. These studies have concluded that the use of RCA instead of RA in beams does not show major variations in mechanical or toughness between aggregates from controlled sources and those from precast rejects.…”

Section: Introductionmentioning

confidence: 86%

A Study of the Structural Behavior of Recycled-Concrete Haunched Beams with Web Opening

Mosa¹,

Abbas²

2022

MMEP

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The structural behavior of Reinforced Concrete Haunched Beams (RCHBs) was investigated in this study. One prismatic control beam and fourteen Haunched Beams (HBs) were used in the experimental test and numerical analysis. The variables considered are Recycled Concrete Aggregate (RCA) ratio which is taken as 0, 30 %, and 60 %, opening shape (square and circular with the same area of 4560 mm2), and haunch angle (α) of 6.34° and 9.46°. The samples of dimensions (1750x200x300) mm were tested under a two-point load. The samples were simulated numerically using the Abaqus/CAE tool. The experimental outcomes show that using 30% RCA decreased the resistance by 8.24% - 26.45% compared with the control sample. While at 60% RCA, the resistance decreased by 16.35% - 34.71%. HBs with α=6.34° give a strength quite close to the control beam (PN) by 1.93%, while α=9.46° decreases the strength by 12.94% compared with PN. Compared with the solid beam, square holes in HBs provide a strength reduction range of 5.83% - 18.79% for α=6.34° and α=9.46°, respectively. The beams with circular apertures have a resistance decrease of about 3.43% - 14.70%, which corresponds to α=6.34° and α=9.46°. The numerical findings were 8.41% of the experimental data.

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Shear Strength of Reinforced Concrete Beams Made with Recycled Aggregate

Cited by 7 publications

References 9 publications

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

The Structural Behavior of Reinforced Concrete Beams Made with Locally Produced Recycled Aggregate in the UAE

A Study of the Structural Behavior of Recycled-Concrete Haunched Beams with Web Opening

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