Flexural performance of reinforced recycled aggregate concrete beams

Choi, Wonchang; Kim, Sun-Woo

doi:10.1680/macr.11.00018

Cited by 63 publications

(34 citation statements)

References 3 publications

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“…[3] and Eq. [4], the failure criterion for concrete under principal stresses state can be translated into that under combined compression and shear stresses state.…”

Section: A Failure Criterion For Rac Under Combined Compression and Smentioning

confidence: 99%

“…As a viable way to address demolition waste, recycled aggregate concrete (RAC) can help provide a sustainable construction material and has received considerable attention in many countries over the last several decades (1)(2). Although the recycling rate is high in some countries, the use of recycled aggregate is still confined to low-grade applications, such as pavement base, backfill for retaining and hard-core (3)(4)(5), which greatly limits the development and application of RAC.…”

Section: Introductionmentioning

confidence: 99%

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Behaviour of recycled aggregate concrete under combined compression and shear stresses

2018

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ABSTRACT:To investigate the behaviour of recycled aggregate concrete (RAC) under combined compression and shear stresses, 75 hollow cylinder specimens prepared with various replacement ratios of recycled coarse aggregate (RCA) were tested with a self-designed loading device. The results showed that the failure pattern was similar for RAC with different replacement ratios of RCA. The ultimate shear stress improved with an increasing axial compression ratio of less than 0.6 and declined after exceeding 0.6. A modified failure criterion for RAC with normal strength under combined compression and shear stresses was proposed. A new procedure to predict the shear strength for RAC beams without stirrups was developed based on the proposed failure criterion, showing a better correlation with the experimental results than the predictions calculated by GB50010, Eurocode 2, fib Model Code 2010 and ACI 318-11. RESUMEN:Comportamiento del hormigón con árido reciclado bajo esfuerzos combinados de compresión y cizallamiento. En este estudio, se ensayaron 75 probetas cilíndricas huecas preparadas con distintos porcentajes de sustitución de árido grueso reciclado (RCA) con una máquina de ensayos auto-diseñada con el fin de investigar la resistencia del hormigón con árido reciclado (RAC) a la acción conjunta de los esfuerzos de compresión y de corte. Según los resultados obtenidos, el patrón de fractura del RAC era similar independientemente del porcentaje de sustitución. La resistencia a cortante aumentó hasta una relación de compresión axial de 0.6 y disminuyó a partir de ese valor. En el artículo se propone modificar el criterio de rotura del RAC de resistencia normal ante la acción conjunta de los esfuerzos antedichos. Se ha desarrollado un nuevo procedimiento para predecir la resistencia al corte de las vigas RAC sin estribos basándose en el criterio de rotura propuesto, consiguiéndose una mejor correlación con los resultados experimentales que en el caso de las predicciones calculadas mediante los métodos GB50010, Eurocode 2, fib Model Code 2010 y ACI 318-11.

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“…[3] and Eq. [4], the failure criterion for concrete under principal stresses state can be translated into that under combined compression and shear stresses state.…”

Section: A Failure Criterion For Rac Under Combined Compression and Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Behaviour of recycled aggregate concrete under combined compression and shear stresses

2018

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“…Several studies on the structural behavior of RAC have been performed. The researches carried out on the beams showed that the flexural capacity of RAC beams were similar to that of the Natural Aggregate Concrete (NAC) beams [4][5][6]. The crack width of RAC beams was larger than that of NAC beams, while the flexural stiffness of RAC beams was lower compared with that of NAC beams.…”

Section: Introductionmentioning

confidence: 99%

Flexural behaviour of recycled aggregate concrete graded slabs

Xiao

Sun

Jiang

2015

Structural Concrete

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“…The article by Park et al (2012) is also concerned with the seismic design of reinforced concrete. It considers the modelling of confined concrete under combined axial load and bending.The paper by Choi et al (2012) considers the flexural performance of reinforced concrete beams with recycled aggregate. Significantly, the performance of the beams with recycled aggregates is shown to be comparable with that of beams with natural aggregate.…”

mentioning

confidence: 99%

“…The paper by Choi et al (2012) considers the flexural performance of reinforced concrete beams with recycled aggregate. Significantly, the performance of the beams with recycled aggregates is shown to be comparable with that of beams with natural aggregate.…”

mentioning

confidence: 99%

Editorial: Research into structural concrete

Vollum¹

2012

Magazine of Concrete Research

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This themed issue of the Magazine of Concrete Research includes eight papers that have been chosen to reflect the diversity of current research into structural concrete. None of the papers were specially commissioned for the issue. A striking feature of all the papers is that they involve experimental work, as well as analytical modelling, which illustrates the continuing importance of structural testing in concrete research. (2010) have previously raised the concern that statically indeterminate members can fail in shear after the formation of the first plastic hinge prior to reaching their design load. Considerations like these suggest that tests on statically determinate beams may not be a good indicator of the performance of continuous beams where significant moment redistribution can occur following the development of the first plastic hinge. Therefore, there appears to be a need for further tests to study the effect of yielding of flexural reinforcement on the shear resistance of continuous beams.The paper by Yang et al. (2012) is also concerned with the shear transfer but this time with shear transfer through monolithic concrete joints. In this case, concrete is modelled as a rigidperfectly plastic material that reflects the diversity of modelling approaches for structural concrete. The paper by Motamed et al. (2012) considers the influence of horizontal web reinforcement on shear resistance. The article focuses on the contribution of dowel action which is not widely considered in shear design.The paper by Lu et al. (2012) considers the behaviour of reinforced concrete dapped-end beams for which a softened strutand-tie model is shown to give reasonable predictions of shear strength. In this context, it is interesting to note that neither Eurocode 2 nor the draft Model Code 2010 relate the concrete compressive strength in struts to their orientation or the strain in the ties as suggested by Collins et al. (2008). This would seem to be a significant omission since there is considerable evidence that the compressive strength of struts in short span beams depends upon the ratio of the shear span to the effective depth. For this reason, the background document (BSI, 2010) to the UK National Annex to Eurocode 2 limits the use of the strut-and-tie method to cases where the ratio of the shear span to the effective depth is less than 1 . 5.The remaining paper on shear concerns the behaviour of nonseismically detailed beam-column joints under cyclic loading (Joyklad et al., 2012). This is an important issue as many reinforced concrete framed structures in seismic regions have not been designed to modern seismic codes. The article by Park et al. (2012) is also concerned with the seismic design of reinforced concrete. It considers the modelling of confined concrete under combined axial load and bending.The paper by Choi et al. (2012) considers the flexural performance of reinforced concrete beams with recycled aggregate. Significantly, the performance of the beams with recycled aggregates is shown to be comparable ...

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Flexural performance of reinforced recycled aggregate concrete beams

Cited by 63 publications

References 3 publications

Behaviour of recycled aggregate concrete under combined compression and shear stresses

Behaviour of recycled aggregate concrete under combined compression and shear stresses

Flexural behaviour of recycled aggregate concrete graded slabs

Editorial: Research into structural concrete

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