Improving the shear performance of reinforced concrete beams made of recycled coarse aggregate

Etman, Emad; Afefy, Hamdy M.; Baraghith, Ahmed T.; Khedr, Sara A.

doi:10.1016/j.conbuildmat.2018.07.065

Cited by 40 publications

(30 citation statements)

References 15 publications

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“…Table 1 [ 15 , 20 , 21 , 22 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ] highlights the literature focusing on RCA’s effects on shear strength, with the last three rows focusing specifically on the effect of fibers addition on shear strength of RCA. RCA generally decreases shear strength in beams as well as cylindrical push-off specimens [ 22 , 50 , 52 , 55 , 56 , 57 , 58 , 61 ], in addition, other research efforts indicated that shear strength is decreasing as the RCA replacement ratio increases [ 15 , 63 ].…”

Section: Introductionmentioning

confidence: 99%

“…Research efforts by [ 69 , 70 , 72 ] focus on the improvement of shear strength when steel fibers are added, and in addition, models/equations capable of predicting shear contribution of fiber reinforced concrete and the improvement of shear strength are proposed by [ 70 , 73 ]. When short steel fibers are added in RCA specimens, the reduction in shear strength is negated, and additional shear strength is provided [ 64 ], which could be attributed to the fiber ability to bridge cracks and improve the ITZ performance in RCA [ 67 ]. Increasing the RA replacement ratio improved the shear behavior with different transverse reinforcement spacing in fiber reinforced concrete [ 65 ], and shear strength of beams considerably improves in beams, cylinders, cubes, and prisms when fibers are added to specimens with RCA [ 66 ].…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Ghoneim

Yehia

et al. 2020

Materials

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“…Therefore, RAC contributes lower shear strength to the columns. The shear-critical structural elements made of RAC present inadequate bearing capacity compared with the conventional one (Arezoumandi et al, 2014; Etman et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Adding fibers is a wise choice to control cracks’ propagation, and shows promise to improve the shear resistance of RAC. Etman et al (2018) investigate the shear performance of reinforced concrete (RC) beams made of RAC and short polypropylene fibers. The results show that the decrease of shear strength of RC beams due to RAC could be compensated by adding short fibers.…”

Section: Introductionmentioning

confidence: 99%

Shear response of steel fiber reinforced recycled concrete-filled steel tube columns

Liu

Liao

2021

Advances in Structural Engineering

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A comprehensive study of the shear characteristics of steel fiber reinforced recycled concrete-filled steel tube (SRCFST) columns is conducted. 50 CFST stub columns are tested with the variables of steel tube diameter-thickness ratio ( D/t), shear span-to-depth ratio (λ), axial compression ratio ( n), and concrete mix. Two types of cements, three recycled aggregate percentages, three water-cement ratios, and three steel fiber contents are considered in design of concrete mixes. The experimental results show that SRCFST columns present the coincident shear behavior of the ordinary CFST columns. As λ is increased, shear resistance shows a downtrend, while the flexural strength presents an increasing trend. Imposing axial compression or thickening steel tube contributes to an adequate safety margin in plastic period. Based on the contributions superposition method, a predicted model of the shear capacity of SRCFST columns is proposed in consideration of shear-span ratio, axial compression, and self-stress.

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“…In the research of Chaboki et al [19], the flexural behavior and ductility ratio of reinforced concrete beams made with steel fibers and coarse recycled aggregates were studied. Etman et al [20] investigated experimentally and analytically the shear performance of recycled concrete [24] was dedicated to the assessment of the structural performance of a new lightweight block for oneway precast concrete slabs made of short sisal fiberreinforced concrete containing natural and recycled aggregates. Chan et al [25] analyzed potential use of fiberreinforced recycled aggregate concrete for sustainable pavements.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Substitution Rate on the Mechanical Properties of Recycled Concrete Hollow Block

Lijun

2019

Advances in Materials Science and Engineering

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In this paper, to study the compressive and flexural properties of recycled concrete hollow blocks, the quality substitution rate of recycled fine aggregates is taken as a variable parameter, and four kinds of substitution rates are designed, which are 0%, 30%, 60%, and 100%. At the same time, one kind of recycled coarse and fine aggregates is designed, and the quality substitution rate is 100%. 110 specimens of MU10 and MU7.5 strength grades are tested for compressive and flexural strength. The failure process and morphology of the specimens are observed to obtain compressive and flexural strength. Based on the test data, the relationship between compressive and flexural strength of recycled fine aggregates with different replacement ratios is analyzed in detail. The main findings are that experiment results show the compressive and flexural strength decrease with the increase of substitution rate of recycled fine aggregates under the same other conditions. The work of the paper is a new reform for the source of raw materials for wall materials, and it is a new way for the reuse of concrete garbage and has important environmental protection significance and engineering practical significance for building energy saving.

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Improving the shear performance of reinforced concrete beams made of recycled coarse aggregate

Cited by 40 publications

References 15 publications

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Shear response of steel fiber reinforced recycled concrete-filled steel tube columns

Analysis of the Effect of Substitution Rate on the Mechanical Properties of Recycled Concrete Hollow Block

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