Long-term deflection and flexural behavior of reinforced concrete beams with recycled aggregate

Choi, Wonchang; Kim, Sun-Woo

doi:10.1016/j.matdes.2013.04.044

Cited by 119 publications

(38 citation statements)

References 16 publications

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“…The total replacement of ordinary aggregates by C&D recycled aggregate with envelope density of 2.50 g/cm 3 shows similar performance to the reference concrete. This finding is very similar to the results obtained by Choi & Yun [13] using a recycled aggregate with an envelope density of greater than 2.50 g/cm³. In this case, steel fibre contents higher than 20 kg/m 3 allow to SFRRCAC to present equivalent flexural behaviour to ordinary SFRC.…”

Section: Resultssupporting

confidence: 89%

Influence of Low Content of Steel Fibre on Concretes Produced With Recycled Coarse Aggregates With Different Levels of Density

Figueiredo¹,

Pietra²,

Bitencourt³

2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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When construction and demolition (C&D) waste is applied in concrete as aggregate, its porosity leads to a concrete with a reduced strength. Normally, this drawback induces to mixdesigns with higher cement contents in order to compensate the strength reduction, which also increases the environmental impact of the material. The experimental study carried out in this work demonstrates that the flexural strength reduction is diminished with steel fibres reinforcement. This condition could compensate this drawback for some applications where the use of fibres is already forecasted. Recycled C&D aggregates with different density levels were produced to be added in concrete with different steel fibres contents. The experimental and numerical results demonstrate that the reduction of C&D aggregates oven-dry (OD) density will lead to a reduction on compressive strength without any influence of the fibres. Instead, the use of steel fibres could mitigate the flexural strength decrease. The performance of the concrete with recycled aggregates were approximated to the conventional concrete when the fibre content was increased on the first one. The behaviour was even closer when the w/c ratio was higher and the matrix strength was reduced for both types of concrete. 1.

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Section: Resultssupporting

confidence: 89%

Influence of Low Content of Steel Fibre on Concretes Produced With Recycled Coarse Aggregates With Different Levels of Density

Figueiredo¹,

Pietra²,

Bitencourt³

2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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“…With respect to the components of RAC, Arezoumandi et al [9] and Choi et al [10] tested the shear strength of RAC beams under short-and long-term loads and discussed the applicability of the design code, modifying compression field theory to the shear strength of the RAC beams. The axial compressive performance of RAC columns was also investigated.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Seismic Behavior of Steel Frames with Infilled Recycled Aggregate Concrete Shear Walls

2019

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Experiments were performed on four specimens of steel frames with infilled recycled aggregate concrete shear walls (SFIRACSWs), one specimen of infilled ordinary concrete wall, and one pure-steel frame were conducted under horizontal low cyclic loading. The influence of the composite forms of steel frames and RACSWs (namely, infilled cast-in-place and infilled prefabricated) on the failure modes, transfer mechanisms of lateral force, bearing capacity, and ductility of SFIRACSWs is discussed, and the concrete type and connecting stiffness of beam–column joints (BCJs) are also considered. Test results showed that infilled RACSWs can increase the bearing capacity and lateral stiffness of SFIRACSWs. The connecting stiffness of BCJs slightly influences the seismic behavior of SFIRACSWs. In the infilled cast-in-place RACSWs, the wall cracks mainly extended along the diagonal direction. The bearing capacity was 2.4 times higher than in the pure steel frame, the initial stiffness was 4.3 times higher, and the displacement ductility factors were 2.44–2.69 times higher. In the infilled prefabricated RACSWs, the wall cracks mainly extended along the connection between the embedded T-shape connectors and walls before finally connecting along the horizontal direction. Moreover, shear failure occurred in the specimens. The bearing capacity was 1.44 times higher than that of the pure steel frame, the initial stiffness was 2.8 times higher, and the displacement ductility factors were 3.32–3.40 times higher. The degradation coefficients of the bearing capacity were more than 0.85, indicating that the specimens demonstrated a high safety reserve.

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“…Plastic deformation was reported as being several times larger than the elastic deformation [8,9]. The existing cracks become wider under long-term loading [10] and make structures more vulnerable to aggressive environmental attacks.…”

Section: Introductionmentioning

confidence: 99%

Analytical study on creep shear failures of RC slender beams without web reinforcement

et al. 2018

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Abstract. Sustained load problems, which can cause excessive deformation and severe damage to concrete structures, have been considered in current worldwide design codes by applying reduction factors on the compressive and tensile strength of concrete. A reduction factor in the shear design may also be required due to the decrease of shear-transfer action corresponding to the increases of the shear cracks opening. However, only a few studies are examining the effect of creep on shear performance of concrete structures, and the results are still inconclusive. As a complement to the previous experimental works, this study aims to investigate the effect of loading rate on the shear capacity of RC slender beams by non-linear finite element (FE) analysis. A spaceaveraged constitutive model with fixed multi-directional cracks was employed in the simulation of diagonal shear failure. The present study analytically examines the time-dependent effects on the beams under different loading rates until the delayed failure and compares the results with the previous experimental ones.

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Long-term deflection and flexural behavior of reinforced concrete beams with recycled aggregate

Cited by 119 publications

References 16 publications

Influence of Low Content of Steel Fibre on Concretes Produced With Recycled Coarse Aggregates With Different Levels of Density

Influence of Low Content of Steel Fibre on Concretes Produced With Recycled Coarse Aggregates With Different Levels of Density

Experimental Study on Seismic Behavior of Steel Frames with Infilled Recycled Aggregate Concrete Shear Walls

Analytical study on creep shear failures of RC slender beams without web reinforcement

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