Shear behaviour of recycled aggregate concrete beams with and without shear reinforcement

Ignjatović, Ivan; Marinković, Snežana; Tošić, Nikola

doi:10.1016/j.engstruct.2017.03.026

Cited by 117 publications

(67 citation statements)

References 19 publications

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“…Adding 8% silica fume in the weight of the cement to the recycled aggregate concrete could improve the shear cracking of reinforced recycled aggregate concrete beams, while the ultimate loads tend to be the same [34]. When the concrete with coarse recycled aggregate replacing 50% and 100% natural aggregate has similar compressive strength of conventional concrete, the shear behavior and shear strength of reinforced recycled aggregate concrete beams with stirrups ratio of 0.14% and 0.19% were very similar to that of the corresponding reinforced conventional concrete beams [35]. By treating the recycled aggregate as two-phase material comprising residual mortar and natural aggregate, the shear performance of reinforced recycled aggregate concrete beams is comparable, or even superior, to that of beams made entirely with natural aggregate [36].…”

Section: Introductionmentioning

confidence: 99%

“…By treating the recycled aggregate as two-phase material comprising residual mortar and natural aggregate, the shear performance of reinforced recycled aggregate concrete beams is comparable, or even superior, to that of beams made entirely with natural aggregate [36]. Generally, the tested recycled aggregate concrete beams could be designed conservatively by using the current codes for conventional concrete beam [31,[33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates

Liang

Zhao

et al. 2020

Materials

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This paper is the outcome of experiments on the shear performance of reinforced concrete beams with approved composite-recycled aggregates. The strength grade of composite-recycled aggregate concrete (CRAC) was between 30 MPa and 60 MPa. The shear span-to-depth ratio varied from 1 to 3. The adaptability of HRB400 rebar, with critical yield strength of 400 MPa, used as stirrups was also verified. As the composite technology overcame the shortcomings of recycled coarse aggregate, CRAC had similar mechanical properties with those of conventional concrete. Details on the shear behaviors of test beams under a four-point loading test are presented. The results indicated that the changes of CRAC strain, stirrup strain, and shear-crack width depended on the failure patterns, which are controlled by the shear-span to depth ratio. The stirrups yield at the failure of reinforced CRAC beams. The shear cracking resistance and the shear capacity of reinforced CRAC beams can be predicted by the statistical equations. Based on the design codes GB50010, ACI318-19, Model Code 2010 and DIN-1045-1-2008 for conventional reinforced concrete beams, the shear strengths provided by CRAC and stirrups are statistical analyzed. The rationality of the design equations is examined by the utilization level of shear strength provided by CRAC. The maximum shear-crack widths are extracted from the test data of reinforced CRAC beams at normal service state. Comparatively, by specifying the lower limit of shear strength provided by the CRAC with various shear-span to depth ratios, China code GB50010 gives a rational method for utilizing CRAC. Under the premise that the design of shear capacity would give considerations to meet the normal serviceability, the factored strength of HRB400 rebar should be 360 MPa for the calculation of shear strength provided by stirrups. The design methods in codes of GB50010, ACI318-19 and Model Code 2010 are conservative for the shear capacity of reinforced CRAC beams.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates

Liang

Zhao

et al. 2020

Materials

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“…It was found that the code equations can adequately predict the shear strength of recycled coarse aggregate concrete beams. Ignjatović et al [9] conducted 9 experiments to study the shear behaviour of recycled aggregate concrete beams with and without shear reinforcement. The results showed that the shear strength of the beams with 50% and 100% of recycled concrete aggregate were very similar to that of the corresponding beam with natural aggregate.…”

Section: Literature Searchmentioning

confidence: 99%

Shear Strength of Reinforced Concrete Beams Made with Recycled Aggregate

Tabsh¹,

Yehia²

2018

World Congress on Civil, Structural, and Environmental Engineering

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Using recycled concrete aggregate in new concrete mixes saves landfill space, reduces the need for gravel mining, and decreases pollution from transporting concrete to and from worksites. Recycled concrete aggregate may come from a variety of sources but the most common source is the demolition waste of old concrete structures. In this study, the recycled aggregate was obtained locally from Bee'ah's facility in Sharjah, UAE, and the percentage of coarse aggregate replacement in the concrete mix was either 50% or 100%, in addition to the control mix which included 100% natural aggregate. The target 28-day compressive strength based on 150mmx300mm cylinder was within the range 30-35MPa. The first phase of the study addressed the recycled aggregate tests and concrete mix design while the second phase involved shear strength of three half-scale reinforced concrete beams made with the recycled and natural aggregate. In the later part, the simply supported beams were tested under a single-point loading scheme inside a Universal Test Machine at a shear span-to-depth ratio of 1.5 to determine the load-deflection performance up to failure. Results of the study showed that the elastic stiffness, ultimate shear capacity and residual strength of steel reinforced beams made with 50% and 100% recycled coarse aggregate were comparable to those made entirely with natural aggregate and can be conservatively predicted by the theoretical equations of the ACI 318 code.

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“…In the first case, the truss model, presented by Ritter and later developed by Mörsch, is one of most accepted theories to explain the behavior of concrete beams with shear reinforcement. However, the behavior of concrete beams without shear reinforcement remains a current topic, and studies have been published within the framework of safety of existing structure or related to the use or recycled aggregate concrete . The parameters that contributes for shear transfer mechanisms are identified as follows: transverse reinforcement (this component does not exist in beams without stirrups); dowel action of the longitudinal reinforcement ( V d ); crack friction or aggregate interlock ( V ag ); shear stresses on uncracked concrete in compressive zone ( V c ); and arch effect (particularly, relevant in short span beams with loads applied near supports, where a flow of compression stresses is directly formed to the support).…”

Section: Introductionmentioning

confidence: 99%

“…However, the behavior of concrete beams without shear reinforcement remains a current topic, and studies have been published within the framework of safety of existing structure or related to the use or recycled aggregate concrete. [4][5][6][7] The parameters that contributes for shear transfer mechanisms are identified as follows: transverse 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.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the shear transfer mechanisms in reinforced concrete beams using photogrammetry

Valença

Carmo

2019

Structural Concrete

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The models to predict the shear behavior in reinforced concrete (RC) members are still far from be consensual. Thus, a detailed understanding of the physical phenomenon and a detailed monitoring of shear tests on RC members is fundamental. Identify and quantify separately the contribution of each component of the shear transfer mechanism it is a challenge. The traditional instrumentation usually results in the evaluation of a limited number of sections. Additionally, technologies based on image analysis have been applied to structural monitoring with excellent results. In this paper, the method Photo‐Shear, developed to monitoring shear tests based on photogrammetry, is presented. The method allows a better understanding of the shear strength mechanism by acquiring data from the surface of RC members. Then, postprocessing procedures leads to outputs with the redundancy and complementarity necessary to characterize: (a) displacement and strain fields; (b) overall shear deformation (distortion and rotation); (c) load path and direction of the compression strut; (d) shear cracks' characterization; and (e) the aggregate interlock effect. The method was validated by monitoring two RC beams tests. Based on the results obtained, several advantages of the proposed Photo‐Shear method were demonstrated over the traditional instrumentation, namely, the quantity and quality of the information obtained, and the redundancy and complementarity of the results analyzed.

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Shear behaviour of recycled aggregate concrete beams with and without shear reinforcement

Cited by 117 publications

References 19 publications

Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates

Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates

Shear Strength of Reinforced Concrete Beams Made with Recycled Aggregate

Evaluation of the shear transfer mechanisms in reinforced concrete beams using photogrammetry

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