Dispersion, Workability and Mechanical Properties of Different Steel-Microfiber-Reinforced Concretes with Low Fiber Content

Zhou, Ying; Xiao, Yi; Gu, Anqi; Lü, Xilin

doi:10.3390/su10072335

Cited by 12 publications

(10 citation statements)

References 34 publications

(40 reference statements)

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“…Two different SFRC mixtures were produced with steel fiber volume fractions, V f , equal to 1% and 3%, respectively. Special attention was given to the 3% SFRC mixture in order to ensure flowability of the fresh mixture and uniformity of fiber distribution, since it is known that high fiber content (≥1.5%) can decrease mechanical properties of concrete [35].…”

Section: Steel Fiber Reinforced Concretementioning

confidence: 99%

“…Thus, a critical volume fraction of steel fibers has been proposed in order to design high-performance fibrous concrete mixtures that achieve strain hardening under direct tension with advanced ductility and energy absorption capacity [29,30,31], such as ultra-high performance SFRC [32]. Nevertheless, dispersion of long steel fibers with higher volumetric proportions was found to be problematic [33] with regard to the fine workability properties of fibrous mixtures with short lengths [34] or even microfilament steel fibers that were 13 mm long [35].…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

2019

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Reinforced concrete (RC) beams under cyclic loading usually suffer from reduced aggregate interlock and eventually weakened concrete compression zone due to severe cracking and the brittle nature of compressive failure. On the other hand, the addition of steel fibers can reduce and delay cracking and increase the flexural/shear capacity and the ductility of RC beams. The influence of steel fibers on the response of RC beams with conventional steel reinforcements subjected to reversal loading by a four-point bending scheme was experimentally investigated. Three slender beams, each 2.5 m long with a rectangular cross-section, were constructed and tested for the purposes of this investigation; two beams using steel fibrous reinforced concrete and one with plain reinforced concrete as the reference specimen. Hook-ended steel fibers, each with a length-to-diameter ratio equal to 44 and two different volumetric proportions (1% and 3%), were added to the steel fiber reinforced concrete (SFRC) beams. Accompanying, compression, and splitting tests were also carried out to evaluate the compressive and tensile splitting strength of the used fibrous concrete mixtures. Test results concerning the hysteretic response based on the energy dissipation capabilities (also in terms of equivalent viscous damping), the damage indices, the cracking performance, and the failure of the examined beams were presented and discussed. Test results indicated that the SFRC beam demonstrated improved overall hysteretic response, increased absorbed energy capacities, enhanced cracking patterns, and altered failure character from concrete crushing to a ductile flexural one compared to the RC beam. The non-fibrous reference specimen demonstrated shear diagonal cracking failing in a brittle manner, whereas the SFRC beam with 1% steel fibers failed after concrete spalling with satisfactory ductility. The SFRC beam with 3% steel fibers exhibited an improved cyclic response, achieving a pronounced flexural behavior with significant ductility due to the ability of the fibers to transfer the developed tensile stresses across crack surfaces, preventing inclined shear cracks or concrete spalling. A report of an experimental database consisting of 39 beam specimens tested under cyclic loading was also presented in order to establish the effectiveness of steel fibers, examine the fiber content efficiency and clarify their role on the hysteretic response and the failure mode of RC structural members.

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Section: Steel Fiber Reinforced Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

2019

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“…However, the presence of rigid steel fibres substantially reduced the workability of fresh concrete [ 33 , 34 ]. That has been a crucial reason limiting the use of steel fibrous concretes [ 35 , 36 ]. In this study, appropriate measures of concrete mix adjustment and optimisation were adopted to cope with the different volumetric contents of steel micro-fibres.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Improvement of Bond Performance of Synthetic Macro-Fibres in Concrete

Garnevičius

Plioplys

et al. 2020

Materials

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Strength and stiffness are the key parameters characterising the bond performance of fibres in concrete. However, a straightforward procedure for estimating the bond parameters of a synthetic macro-fibre does not exist. This study employs pull-out tests to investigate the bond behaviour of synthetic macro-fibres. Two types of macro-fibres available in the market were investigated. A gripping system was developed to protect the fibres from local damage. The experimental campaign consisted of two stages. At the first stage, 32 concrete specimens were manufactured for performing 96 pull-out tests (three fibre samples were embedded in each cube perpendicular to the top surface and two sides). Two types of macro-fibres with either 10 or 20 mm embedment length were tested. The obtained load–displacement diagrams from pull-out tests demonstrate that the bond performance (characterised by the strength and deformation modulus) of the “top” fibres is almost 20% weaker than fibres positioned to the side surfaces. At the second stage, one type of macro-fibre was chosen for further experimentation of the feasibility of improving the bond performance through the use of colloidal silica or steel micro-fibres. This investigation stage employed an additional 36 concrete specimens. The use of steel micro-fibres was found to be an efficient alternative. The success of this solution requires a suitable proportioning of the concrete.

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“…In this regard, the application of fibres is considered as an efficient solution of the cracking problems [5,6]. Fibres might also improve structural resistance in complex loading situations [7,8] and impart additional ductility and deformability to the structural member [9,10]. In a cracked section of a member, fibres can carry a certain portion of the tensile stresses through the bond between fibres and surrounding concrete.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of Fibre Reinforced Concrete Elements: Synergy of the Fibres and External Sheet

Gribniak

Tamulenas

et al. 2019

Sustainability

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In structural rehabilitation and strengthening, the structural members are often required to cope with larger design loading due to the upgrading of building services and design standard, while maintaining the member size to preserve the architectural dimensions and headroom. Moreover, durability enhancement by mitigating or eliminating the reinforcement corrosion problem is often desired. Concrete cracking is a major initiating and accelerating factor of the corrosion of steel reinforcement. The application of fibres is a prominent solution to the cracking problem. Furthermore, the fibres can increase the mechanical resistance of the strengthening systems. This study reveals the synergy effect of the combined application of steel fibres and external carbon fibre-reinforced polymer (CFRP) sheets. The investigation encompasses the use of fibre-reinforced polymer (FRP) reinforcing bars, discrete steel fibres, externally bonded and mechanically fastened FRP sheets in different combinations. It is discovered that the steel fibres can help to control concrete cracking and eventually alter the failure mode and enhance the flexural resistance. The FRP reinforcement system, together with the steel fibres, radically resolves the structural safety problem caused by corrosion of the steel bar reinforcement. Finally, the impact of the external sheet on the fire limit state performance needs to be resolved, such as by adopting fire protection rendering for the finishes layer.

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Dispersion, Workability and Mechanical Properties of Different Steel-Microfiber-Reinforced Concretes with Low Fiber Content

Cited by 12 publications

References 34 publications

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

Investigation and Improvement of Bond Performance of Synthetic Macro-Fibres in Concrete

Strengthening of Fibre Reinforced Concrete Elements: Synergy of the Fibres and External Sheet

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