Test and Evaluation of the Flexural Properties of Reinforced Concrete Beams with 100% Recycled Coarse Aggregate and Manufactured Sand

Li, Changyong; Liu, Tongsheng; Fu, Hao; Zhang, Xiaoyan; Yang, Yabin; Zhao, Shunbo

doi:10.3390/buildings11090420

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…The target pre-crack width was the limit of 0.20 mm for reinforced concrete beams in normal environment [40]. The cracks were made by four-point bending test [42,43]. The…”

Section: Pre-crack Loading and Strengthening Methodsmentioning

confidence: 99%

“…The target pre-crack width was the limit of 0.20 mm for reinforced concrete beams in normal environment [40]. The cracks were made by four-point bending test [42,43]. The loads were multi-step with increments of 20% of the ultimate, except for the step that was 10% of the ultimate when the loads reached the cracking resistance.…”

Section: Pre-crack Loading and Strengthening Methodsmentioning

confidence: 99%

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Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads

Wang,

Li,

Song

et al. 2023

Buildings

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Because researchers are aiming to restore the deformation and minimize the crack width of existing concrete structures, the strengthening technology of prestressed carbon-fiber-reinforced plastic (CFRP) is currently the focus of many studies and applications. In terms of the strengthening of a prestressed CFRP sheet on the flexural performance of cracked reinforced concrete beams under repeated loads, a four-point bending test of 12 beams was conducted considering the prestress degree reflected by the amount and the prestress force of the CFRP sheet. The longitudinal strengthened CFRP sheet was bonded on the bottom surface of the test beam and fixed by U-jacket CFRP sheets at the ends after tensioning. The strains of concrete, longitudinal tensile steel bars and CFRP sheets were measured at the pure bending segment of test beams, while the cracks, midspan deflection and failure pattern were recorded. The results show that the normal strain on the mid-span section of the strengthened beams by the prestress CFRP sheets was fitted for the assumption of plane section, the cracks and mid-span deflection decreased with the prestress degree of the CFRP sheets to provide better serviceability for the strengthened beams, the load capacity could be increased by 41.0–88.8% at the yield of longitudinal tensile steel bars and increased by 41.9–74.8% at the ultimate state and the ductility at the failure state was sharply reduced by 54.9–186%. The peeling off of broken CFRP sheets played a role in controlling the failure pattern of the strengthened beams under repeated loads. Finally, methods for predicting the bending performance of reinforced concrete beams strengthened by prestressed CFRP sheets were proposed. This study enriches the knowledge about damaged reinforced concrete beams that were strengthened with prestressed CFRP sheets.

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“…The target pre-crack width was the limit of 0.20 mm for reinforced concrete beams in normal environment [40]. The cracks were made by four-point bending test [42,43]. The…”

Section: Pre-crack Loading and Strengthening Methodsmentioning

confidence: 99%

Section: Pre-crack Loading and Strengthening Methodsmentioning

confidence: 99%

Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads

Wang,

Li,

Song

et al. 2023

Buildings

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“…The majority of the published research on the subject indicates that beams made with recycled aggregate concrete (RAC) often have slightly less initial stiffness, more cracks, larger deflection, and either similar or marginally lower ultimate flexural strength compared to corresponding beams made with natural aggregate concrete (NAC). In addition, the current theoretical approaches in design codes were found to be applicable to predicting the flexural capacity of recycled aggregate concrete beams [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Performance Of Concrete Structures Prepared With Ramentioning

confidence: 99%

“…Li et al [14] R% = 0 and 100%, 14 RC beams, four-point load, 150 × 400 mm cross-sections, L = 3500 mm (span = 3200 mm), W/C = 0.36-0.55, f c = 40.0-58.7 MPa, ρ = 0.41-3.21%…”

Section: Characteristics Of Specimens and Materials Important Findingsmentioning

confidence: 99%

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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“…Some scholars use the recycled coarse aggregate in reinforced concrete beams to carry out tests on the flexural performance of the beams. It was found that the shear bearing capacity of recycled coarse aggregate concrete beams is low compared to that of ordinary concrete beams, and the crack width of recycled coarse aggregate reinforced concrete beams increases about 16% larger than that of ordinary reinforced concrete beams when the recycled coarse aggregate replacement rate reaches 100% [13,14]. Other scholars have studied recycled aggregates as a substitute for rock aggregates in asphalt concrete and found that recycled aggregates are feasible as replacement aggregates, and the best strength performance of recycled aggregate asphalt concrete can be obtained when recycled aggregates replace natural aggregates according to 40% [15,16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Uniaxial Compression Mechanical Properties of Rubber Powder Recycled Coarse Aggregate Concrete Based on Strain Energy Theory

Wang

2022

Advances in Materials Science and Engineering

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In order to develop and make full use of waste construction concrete and waste tyre rubber powder, the experiment entirely used recycled coarse aggregate to replace natural crushed stone aggregate and investigated the effect of different mesh sizes of rubber powder (20 mesh, 60 mesh, and 100 mesh) on the uniaxial compressive mechanical properties, strain energy density, and pore structure of recycled coarse aggregate concrete at three curing ages (14 d, 28 d, and 90 d). Based on the strain energy theory, fractal theory, and grey correlation theory, the effects of the fractal dimension of the pore size of the rubber powder recycled concrete on the correlation of the strain energy parameters were investigated at different curing ages. The research results show that as the age period increases, the ability of the rubber powder recycled coarse aggregate concrete to absorb strain energy increases. Before the peak stress, the rubber powder recycled coarse aggregate concrete mainly carries out the storage of elastic strain energy. The incorporation of rubber powder can refine the pore structure of the rubber powder recycled coarse aggregate concrete so that the large pore size pores evolve towards the medium (50–200 μm) or small pores (<50 μm). The fractal dimension analysis revealed that the incorporation of 20 mesh and 60 mesh rubber powder enhances the inhomogeneity of the small pore (<50 μm) and the medium pore (40 μm–140 μm) in the recycled concrete. The grey correlation analysis revealed that the pore size factor with the greatest influence on the elastic energy density was the large pore size (>200 μm).

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Test and Evaluation of the Flexural Properties of Reinforced Concrete Beams with 100% Recycled Coarse Aggregate and Manufactured Sand

Cited by 9 publications

References 26 publications

Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads

Flexural Performance of Cracked Reinforced Concrete Beams Strengthened with Prestressed CFRP Sheets under Repeated Loads

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

Analysis of Uniaxial Compression Mechanical Properties of Rubber Powder Recycled Coarse Aggregate Concrete Based on Strain Energy Theory

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