Shear strength of recycled aggregate concrete to natural aggregate concrete interfaces

Ceia, Fátima; Raposo, J.; Guerra, Manuel; Júlio, Eduardo; Brito, Jorge de

doi:10.1016/j.conbuildmat.2016.02.002

Cited by 69 publications

(24 citation statements)

References 16 publications

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“…shear strength fv f decreases from 12.8 MPa to 11.7 MPa, only a very slight decrease of 1.1 MPa. This is different from many previous conclusions that shear strength declines with the increase of the RCA replacement rate [20,27,29]. However, these conclusions were drawn based on the same mixture proportion, where the compressive strength, tensile strength and shear strength of concrete generally decrease with the increase of RCA replacement ratio in this case.…”

Section: Shear Strengthcontrasting

confidence: 99%

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Mechanical behavior of recycled coarse aggregate concrete reinforced with steel fibers under direct shear

Gao

Zhang

Nokken

2017

Cement and Concrete Composites

126

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Recycled coarse aggregate (RCA) concrete has attracted more and more attention worldwide in recent years due to the exhaustion of natural coarse aggregate and environmental pollution from construction and demolition waste in civil engineering. In this study, experiments were carried out on over 100 specimens to investigate the mechanical properties and failure mode of concrete with different volume content of steel fibers (0%, 0.5%, 1%, 1.5%, and 2%) and different RCA replacement ratio (0%, 30%, 50% and 100%) under direct shear load. The results show that addition of steel fibers can effectively improve the shear strength and shear toughness of RCA concrete. For a given compressive strength, the RCA replacement ratio has negligible impact on shear strength, but shear deformation and toughness increase as RCA replacement ratio reaches above a "limiting value". A shear strength formula for steel fiber reinforced RCA concrete (SFRCAC) based on compressive strength and characteristic coefficient of steel fiber has been put forward.

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Section: Shear Strengthcontrasting

confidence: 99%

“…However, there is very limited information concerning the coupling effect of RCA replacement and steel fiber content on the mechanical characteristics of concrete under direct shear [19,20].…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of recycled coarse aggregate concrete reinforced with steel fibers under direct shear

Gao

Zhang

Nokken

2017

Cement and Concrete Composites

126

View full text Add to dashboard Cite

show abstract

“…However, due to the accumulated internal damage caused by the secondary crushing of recycled coarse aggregate (RCA), the mechanical properties of RAC are weaker than those of natural aggregate concrete (NAC). Through a large number of experimental studies, scholars had confirmed that recycled concrete has a lower strength, elastic modulus, energy dissipation and durability but a larger peak strain, Poisson's ratio, shrinkage and creep, compared with NAC [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Concrete-Filled Circular Steel Tubular Column–Reinforced Concrete Beam Frames with Recycled Aggregate Concrete

Chen

Zhou

et al. 2020

Applied Sciences

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The application of recycled aggregate concrete (RAC) in concrete filled steel tubular (CFST) structures can eliminate the deterioration of concrete performance caused by the original defects of the recycled aggregate, which also provides an effective way for the recycling of waste concrete. In this paper, a test of a small scale model of a circular CFST column-reinforced concrete (RC) beam frame with RACs under low cyclic loading was presented in order to investigate its seismic behavior. The failure modes, plastic hinges sequence, hysteresis curve, skeleton curve, energy dissipation capacity, ductility and stiffness degeneration of the frame were presented and analyzed in detail. The test results show that the design method of the recycled aggregate concrete filled circular steel tube (RACFCST) frame complies with the seismic design requirements of a stronger joint followed by the stronger column and the weaker beam. The hysteresis curve of the frame is symmetrical, showing a relatively full shuttle shape; at the same time, the ductility coefficient of the frame is greater than 2.5, showing good deformation performance. In addition, when the frame is damaged, the displacement angle is greater than 1/38, and the equivalent damping ratios coefficient is 0.243, which indicates that the frame has excellent anti-collapse and energy dissipation abilities. In summary, the RACFCST frame has good seismic behavior, which can be applied to high-rise buildings in high-intensity seismic fortification areas.

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“…Recycled concrete aggregates (RCAs) generated from construction and demolition waste (CDW) have been deemed as a potential alternative to natural aggregates (NAs) with the advantage of minimizing the environmental impacts of CDW [1][2][3][4], where the resulting concrete products, termed recycled aggregate concrete (RAC), are now received as a type of "green concrete" [5][6][7][8][9][10]. Along this line, the reinforced recycled concrete (RRC) members (i.e., reinforced concrete slabs, beams, columns and shear walls manufactured with RCAs) have been developed and explored to promote the sustainable use of RAC at the structural level.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Reinforced Recycled Aggregate Concrete Columns under Cyclic Loadings

et al. 2019

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Recycled concrete aggregates (RCAs) generated from construction and demolition activities have been recognized as a feasible alternative to natural aggregates (NAs). Naturally, the columns fabricated with reinforced recycled concrete (RRC) have been proposed and investigated to promote the structural use of recycled aggregate concrete (RAC). There is still, however, very limited modeling research available to reproduce, accurately and efficiently, the seismic response of RRC columns under lateral cyclic loading; proper evaluations are also lacking on addressing the columns’ seismic behaviors. To fill some of those research gaps, a fiber-based numerical model is developed in this study and then validated with the experimental results published in the literature. Subsequently, the numerical model justified is applied to carry out a comprehensive parametric study to examine the effects of a range of variables on the hysteretic characteristics of RRC columns. Furthermore, a grey relational analysis is conducted to establish quantifiable evidence of key variable sensitivities. The evaluation results imply that the use of the additional water method (AWM) for manufacturing RAC is likely to reduce the lateral load-carrying capacity of the RRC columns (up to 10%), whereas the opposite would occur if a conventional mixing procedure is adopted. Moreover, compared with other factors such as steel area ratio, the content of RCA replacement has a less remarkable effect on the seismic performance of the RRC columns. In general, the RRC columns possess acceptable seismic-resistant properties, and they can be used in earthquake-prone regions with confidence.

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Shear strength of recycled aggregate concrete to natural aggregate concrete interfaces

Cited by 69 publications

References 16 publications

Mechanical behavior of recycled coarse aggregate concrete reinforced with steel fibers under direct shear

Mechanical behavior of recycled coarse aggregate concrete reinforced with steel fibers under direct shear

Seismic Behavior of Concrete-Filled Circular Steel Tubular Column–Reinforced Concrete Beam Frames with Recycled Aggregate Concrete

Performance Evaluation of Reinforced Recycled Aggregate Concrete Columns under Cyclic Loadings

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