Behavior of rubberized concrete under active confinement

Gholampour, Aliakbar; Ozbakkaloglu, Togay; Hassanli, Reza

doi:10.1016/j.conbuildmat.2017.01.105

Cited by 77 publications

(32 citation statements)

References 42 publications

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“…On the other hand, Rubcrete can improve other properties of concrete including ductility, durability, energy dissipation, damping ratio, and impact resistance [8][9][10]. As a result of its better dilatancy performance, it has been reported in previous studies that confining of Rubcrete by fibre reinforced polymer (FRP) is more effective compared to traditional concrete [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Axial Compression Behaviour of Hybrid Double-Skin Tubular Columns Filled with Rubcrete

et al. 2019

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Double-skin tubular columns (DSTCs) have become a competitive candidate for column members due to their important advantages compared with conventional reinforced concrete columns, including their better weight-to-strength ratio and ease of construction. Using Rubcrete in hybrid DSTCs is of great interest due to the potential of this system to overcome the Rubcrete material deficiencies and to add more ductility, toughness, seismic resistance, confinement effectiveness, and environmentally-friendly features to that structural system compared to conventional concrete. In this paper, hybrid DSTCs made out of Rubcrete, sandwiched between a fibre reinforced polymer (FRP) tube and a steel tube, were tested. The examined variables were concrete sand or stone replacement ratio (0% and 20%), FRP wall thickness (1- and 2-layers), steel wall thickness (3.2 mm and 4.5 mm), void ratio (50% and 76%), and void shape (circular or square). The axial and lateral stress–strain responses were monitored, measured, and compared. According to this investigation, using Rubcrete in hybrid DSTCs can enhance the axial and hoop strain capacities, especially with fine rubber particles. It was also observed that the adverse influence of using rubber on column ultimate capacity was much lower in DSTC specimens, compared with that of unconfined Rubcrete columns. Therefore, using Rubcrete with fine rubber particles is recommended in DSTC structural columns.

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Section: Introductionmentioning

confidence: 99%

Axial Compression Behaviour of Hybrid Double-Skin Tubular Columns Filled with Rubcrete

et al. 2019

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“…The presence of rubber particles in concrete modifies its microstructure, which directly influences the interlocking behaviour between rebar ribs and concrete keys and consequently the splitting and crushing actions near the interface region. Additionally, the mechanical properties of rubberised concrete under external confinement are strongly modified for high rubber replacements [44][45][46], hence the bond behaviour of deformed bars in confined rubberised concrete is also expected to change. Although some information exists on rebar-rubberised concrete interface behaviour, it is limited to bond strengths rather than the full bond-slip behaviour, whilst the influence of confinement has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Bond-slip response of deformed bars in rubberised concrete

Bompa

Elghazouli

2017

Construction and Building Materials

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This paper is concerned with examining the complete bond-slip behaviour between deformed reinforcement bars and concrete incorporating rubber particles from recycled tyres as partial replacement for mineral aggregates. An experimental study consisting of fifty-four pull-out tests on cylindrical rubberised and normal concrete specimens, in conjunction with two reinforcement sizes with short embedment lengths, is described. In addition to a detailed assessment of the full bondslip relationship, the test results offer a direct interpretation of bond behaviour under practical levels of confinement and its influence on the failure modes. Particular emphasis is given to the characteristic bond behaviour of rubberised concrete in terms of maximum bond strength and splitting strength as well bond stiffness and slip parameters. The detailed test measurements and observations provided in this study enable the definition of key bond parameters depicting the interfacial behaviour between rubberised concrete and deformed bars. The findings also permit the development of modified approaches for reliable representation of the failure modes and bond capacities for the concrete materials considered in this investigation.

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“…Additionally, the axial proportionality limit (σcrc1,εcrc1) at which the linear-elastic branch transitions to the linear hardening range varies with ρvr (Figure 3). Besides the test results in Section 3, previous studies (Gholampour et al, 2017) on actively confined RuC, with up to 7% of total rubber and maximum confining pressure-to-compressive strength ratio fl/frc=0.67, indicated a gradual increase in fcrc and εcrcu2 with the increase in fl. Notably, with an increase in ρvr and fl, the stiffness of the post-peak curve Erc2 was nearly flat, suggesting a softer crushing response due to the presence of rubber particles, as for unconfined RuC.…”

Section: Constitutive Modelling For Frp-confined Rubberised Concretementioning

confidence: 68%

Behaviour of confined rubberised concrete members under combined loading conditions

Bompa

Elghazouli

2021

Magazine of Concrete Research

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This paper presents an experimental study into the fundamental response of reinforced concrete members, incorporating rubber particles obtained from recycled tyres, subjected to combined axialbending loading conditions. Tests on confined circular members with and without internal hoops or external FRP sheets are described. The results show that the rubber particles enhance the confinement level activated, with confined-to-unconfined strength and deformation capacity ratios at least two folds those of conventional concrete members. The hoop-confined members provided with 30% rubber developed a typical reinforced concrete behaviour, with relatively limited deformation capacity in comparison to FRP-confined members. The external confinement enhanced substantially the ultimate rotation of members incorporating 30% rubber, with ductility factors reaching up to ten for relatively small eccentricity levels. An increase in rubber content to 60% had a detrimental effect on the axial capacity, but increased the ultimate rotation up to two folds in comparison to members with 30% rubber. Based on the test results, a design-oriented constitutive model for FRP-confined concrete and a variable confinement procedure for assessing the strength interaction of circular sections are proposed. The suggested procedures capture in a realistic manner the influence of rubber content on the strength and deformation characteristics of confined members.

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Behavior of rubberized concrete under active confinement

Cited by 77 publications

References 42 publications

Axial Compression Behaviour of Hybrid Double-Skin Tubular Columns Filled with Rubcrete

Axial Compression Behaviour of Hybrid Double-Skin Tubular Columns Filled with Rubcrete

Bond-slip response of deformed bars in rubberised concrete

Behaviour of confined rubberised concrete members under combined loading conditions

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