Journal articles on the topic 'Steel-fibre reinforced concrete'
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1
Ghaffar, Abdul, Amit S. Chavhan, and Dr R. S. Tatwawadi. "Steel Fibre Reinforced Concrete." International Journal of Engineering Trends and Technology 9, no. 15 (March 25, 2014): 791–97. http://dx.doi.org/10.14445/22315381/ijett-v9p349.
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Wu, Hailin, Zijia Mi, and Ziqiang Pei. "Experimental study on the crack resistance of steel-nanometre hybrid fibre concrete." E3S Web of Conferences 341 (2022): 01008. http://dx.doi.org/10.1051/e3sconf/202234101008.
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To investigate the effects of steel fibre and nanometre fibre on the cracking of reinforced concrete, the cracking resistance of steel fibre reinforced concrete, nanometre fibre reinforced concrete, and hybrid fibre reinforced concrete with different doping levels were studied in comparison with the baseline concrete specimens by steel-Nano hybrid fibre reinforced concrete axial tensile tests. The results show that when the steel fibre admixture is 1.5% and the nanometre fibre admixture is 0.05%, the initial cracking load of reinforced steel-Nano hybrid fibre axial tensile specimens is enhanced the most, at this time, compared with the initial cracking load of plain concrete specimens by 58.9%, at the same steel stress level, when the steel fibre admixture is 1.5% and the nanometre fibre admixture is 0.10%, it is most effective for crack control.
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Sinha, Dr Deepa A. "Characteristic Properties of Steel Fibre Reinforced Concrete with Varying Percentages of Fibre." Indian Journal of Applied Research 4, no. 7 (October 1, 2011): 218–20. http://dx.doi.org/10.15373/2249555x/july2014/67.
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Aslani, Farhad, Yinong Liu, and Yu Wang. "Flexural and toughness properties of NiTi shape memory alloy, polypropylene and steel fibres in self-compacting concrete." Journal of Intelligent Material Systems and Structures 31, no. 1 (October 5, 2019): 3–16. http://dx.doi.org/10.1177/1045389x19880613.
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Self-compacting concrete presents good workability to fill complicated forms without mechanical vibrations. This concrete is often reinforced with fibres to improve the strength and toughness. This study investigated the use of nickel -titanium (NiTi) shape memory alloy fibres in comparison with polypropylene and steel fibres in self-compacting concrete. The performances of the fresh fibre–reinforced self-compacting concrete are explored by slump flow and J-ring experiments. Meanwhile, the static and cyclic flexural tests are conducted to estimate the bending resistance strength performance, residual deformation and recovering capacity of shape memory alloy, polypropylene and steel fibre–reinforced self-compacting concrete. Moreover, the flexural toughness of the shape memory alloy, polypropylene and steel fibre–reinforced self-compacting concrete is calculated using four different codes. The shape memory alloy fibre–reinforced self-compacting concrete with 0.75% volume fraction presents the largest flexural strength, re-centering ability and toughness in comparison with polypropylene and steel fibre–reinforced self-compacting concretes. The experimental results demonstrated the beneficial influence of the shape memory and superelastic properties of NiTi in postponing initial crack formation and restricting the crack widths.
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Lie, T. T., and V. K. R. Kodur. "Thermal and mechanical properties of steel-fibre-reinforced concrete at elevated temperatures." Canadian Journal of Civil Engineering 23, no. 2 (April 1, 1996): 511–17. http://dx.doi.org/10.1139/l96-055.
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For use in fire resistance calculations, the relevant thermal and mechanical properties of steel-fibre-reinforced concrete at elevated temperatures were determined. These properties included the thermal conductivity, specific heat, thermal expansion, and mass loss, as well as the strength and deformation properties of steel-fibre-reinforced siliceous and carbonate aggregate concretes. The thermal properties are presented in equations that express the values of these properties as a function of temperature in the temperature range between 0 °C and 1000 °C. The mechanical properties are given in the form of stress–strain relationships for the concretes at elevated temperatures. The results indicate that the steel fibres have little influence on the thermal properties of the concretes. The influence on the mechanical properties, however, is relatively greater than the influence on the thermal properties and is expected to be beneficial to the fire resistance of structural elements constructed of fibre-reinforced concrete. Key words: steel fibre, reinforced concrete, thermal properties, mechanical properties, fire resistance.
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Li, Fang-Yuan, Liu-Yang Li, Yan Dang, and Pei-Feng Wu. "Study of the Effect of Fibre Orientation on Artificially Directed Steel Fibre-Reinforced Concrete." Advances in Materials Science and Engineering 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/8657083.
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The fibre utilization efficiency of directionally distributed fibre-reinforced concrete is better than that of randomly distributed fibre. However, controlling the fibre direction is difficult, which limits its applications. In this paper, a method in which fibres were artificially directed was used to simulate the feasibility of orienting fibres during 3D concrete printing. Based on artificially directed steel fibre-reinforced concrete specimens, the orientation characteristics of directional fibre-reinforced concrete specimens were studied. The differences between the gravity and the boundary effects in ordinary fibre-reinforced concrete and artificially directed fibre-reinforced concrete were compared. The average orientation coefficient in randomly distributed fibre-reinforced concrete was 0.59, whereas this value in directionally distributed fibre-reinforced concrete was over 0.9. This result demonstrated the feasibility of manually orienting the fibres in steel fibre-reinforced concrete in layer-by-layer casting.
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Vymazal, T., P. Misák, K. Hrabová, and D. Kocáb. "The influence of steel fibre amount on the consistency, volume changes and compressive strength of concrete." Journal of Physics: Conference Series 2568, no. 1 (August 1, 2023): 012008. http://dx.doi.org/10.1088/1742-6596/2568/1/012008.
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Abstract The paper focuses on the consistency of fresh steel fibre reinforced concrete in relation to the amount of steel fibre used. Consistency was determined by the slump test and the flow table test. Furthermore, the paper deals with monitoring the compressive strength and volume changes during the maturing process of steel fibre reinforced concrete. Volume changes were monitored using a shrinkage drain. The results of the steel fibre reinforced concrete properties are compared with the values of the reference concrete without fibres and with each other. The result is an evaluation of how the amount of fibre affects the properties of fresh and hardened concrete. The dependence between consistency, compressive strength and shrinkage of steel fibre reinforced concrete is also established.
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Anandan, Sivakumar, Sounthararajan Vallarasu Manoharan, and Thirumurugan Sengottian. "Corrosion Effects on the Strength Properties of Steel Fibre Reinforced Concrete Containing Slag and Corrosion Inhibitor." International Journal of Corrosion 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/595040.
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Corrosion in steel can be detrimental in any steel rebar reinforced concrete as well as in the case of steel fibre reinforced concrete. The process of corrosion occurring in steel fibre incorporated concrete subjected to corrosive environment was systematically evaluated in this study. Concrete specimens were prepared with steel fibre inclusions at 1.5%Vf(volume fraction) of concrete and were added in slag based concrete (containing manufactured sand) and replaced with cement at 20%, 40%, and 60% of total binder. Accelerated corrosion studies were carried out using alternate wetting and drying cycle accompanied with initial stress at 40% and 60% of ultimate stress. Concrete specimens were then immersed in chloride-free water and sodium chloride solution (3.5%) after subjecting to initial stress. The alternate wetting and drying process of different concrete mixes was continued for longer exposure (6 months). Later, the strength degradation during the accelerated corrosion process was then assessed in compressive and flexural tests. Test results indicated that the strength degradation was marginal in the case of steel fibre reinforced concrete containing higher slag content and for the concretes containing corrosion inhibitors. The maximum strength reduction was noticed in the case of plain concrete containing steel fibres and, with the slag addition, a considerable reduction in corrosion potential was noticed. Also, with the increase in slag replacement up to 60%, a significant increase in strength was noticed in flexural test. Experimental test results also showed that the corrosion process in steel fibre reinforced concrete can be controlled with the incorporation of corrosion inhibitors in cementitious system.
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Jothi Jayakumar, Vikram, and Sivakumar Anandan. "Composite Strain Hardening Properties of High Performance Hybrid Fibre Reinforced Concrete." Advances in Civil Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/363649.
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Hybrid fibres addition in concrete proved to be a promising method to improve the composite mechanical properties of the cementitious system. Fibre combinations involving different fibre lengths and moduli were added in high strength slag based concrete to evaluate the strain hardening properties. Influence of hybrid fibres consisting of steel and polypropylene fibres added in slag based cementitious system (50% CRL) was explored. Effects of hybrid fibre addition at optimum volume fraction of 2% of steel fibres and 0.5% of PP fibres (long and short steel fibre combinations) were observed in improving the postcrack strength properties of concrete. Test results also indicated that the hybrid steel fibre additions in slag based concrete consisting of short steel and polypropylene (PP) fibres exhibited a the highest compressive strength of 48.56 MPa. Comparative analysis on the performance of monofibre concrete consisting of steel and PP fibres had shown lower residual strength compared to hybrid fibre combinations. Hybrid fibres consisting of long steel-PP fibres potentially improved the absolute and residual toughness properties of concrete composite up to a maximum of 94.38% compared to monofibre concrete. In addition, the relative performance levels of different hybrid fibres in improving the matrix strain hardening, postcrack toughness, and residual strength capacity of slag based concretes were evaluated systematically.
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Sinha, Deepa A., Dr A. K. Verma Dr. A.K.Verma, and Dr K. B. Prakash Dr. K.B. Prakash. "Behavior of steel fibre reinforced ternary blended concrete under flexure." International Journal of Scientific Research 1, no. 6 (June 1, 2012): 40–42. http://dx.doi.org/10.15373/22778179/nov2012/14.
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Teng, Jin-Guang, Zihao Wang, Tao Yu, Yang Zhao, and Li-Juan Li. "Double-tube concrete columns with a high-strength internal steel tube: Concept and behaviour under axial compression." Advances in Structural Engineering 21, no. 10 (February 14, 2018): 1585–94. http://dx.doi.org/10.1177/1369433217746838.
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This article presents a new form of fibre-reinforced polymer-concrete-steel hybrid columns and demonstrates some of its expected advantages using results from an experimental study. These columns consist of a concrete-filled fibre-reinforced polymer tube that is internally reinforced with a high-strength steel tube and are referred to as hybrid double-tube concrete columns. The three components in hybrid double-tube concrete columns (i.e. the external fibre-reinforced polymer tube, the concrete infill and the internal high-strength steel tube) are combined in an optimal manner to deliver excellent short- and long-term performance. The experimental study included axial compression tests on eight hybrid double-tube concrete columns with a glass fibre–reinforced polymer external tube covering different glass fibre–reinforced polymer tube thicknesses and diameters as well as different high-strength steel tube diameters. The experimental results show that in hybrid double-tube concrete columns, the concrete is well confined by both the fibre-reinforced polymer tube and the high-strength steel tube, and the buckling of the high-strength steel tube is suppressed so that its high material strength can be effectively utilized, leading to excellent column performance. Due to the high yield stress of high-strength steel, the hoop stress developed to confine the core concrete is much higher than can be derived from a normal-strength steel tube, giving the use of high-strength steel in double-tube concrete columns an additional advantage.
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Zhao, Yajun, Yimiao Huang, Haiyang Du, and Guowei Ma. "Flexural behaviour of reinforced concrete beams strengthened with pre-stressed and near surface mounted steel–basalt-fibre composite bars." Advances in Structural Engineering 23, no. 6 (December 2, 2019): 1154–67. http://dx.doi.org/10.1177/1369433219891595.
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Fibre-reinforced polymer bars have been widely used for strengthening concrete members due to their high strength, light weight and strong corrosion resistance. A near-surface mounted strengthening system has been adopted to protect the fibre-reinforced polymer bars from external hazards. To make up the lower stiffness and ductility of fibre-reinforced polymer bar compared to steel rebar, this study proposed to use a pre-stressed near-surface mounted steel–basalt-fibre-reinforced polymer composite bar. The steel–basalt-fibre-reinforced polymer composite bar is manufactured through wrapping a steel rod by a basalt-fibre-reinforced polymer cover. A total of nine reinforced concrete beams, including one control or calibration and eight others strengthened by pre-stressed near-surface mounted steel–basalt-fibre-reinforced polymer composite bars, are fabricated and tested. Results show that the proposed steel–basalt-fibre-reinforced polymer composite bar strengthening method can improve both the strength and ductility of the reinforced concrete beams. Pre-stressing of the steel–basalt-fibre-reinforced polymer composite bars further increases substantially the beams’ load-carrying capacity by restraining crack propagation in concrete. Standard-based load analysis correctly predicts the cracking load, however, underestimates the ultimate strength of the beams. Finite element method modelling is conducted to provide a more effective load-carrying capacity prediction and a case study is carried out with regard to the amount of the strengthening steel–basalt-fibre-reinforced polymer composite bars.
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Bywalski, Czesław, and Mieczysław KamiIński. "RHEOLOGICAL STRAINS IN CONCRETE MODIFIED WITH STEEL FIBRE REINFORCEMENT." Journal of Civil Engineering and Management 19, no. 5 (October 29, 2013): 656–64. http://dx.doi.org/10.3846/13923730.2013.803497.
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This paper discusses the rheological properties of normal (ordinary) strength concrete. The results of tests aimed at determining the creep strains and shrinkage strains in normal strength concretes modified with steel fibre reinforcement are presented. The tests were divided into three groups. Steel fibre reinforced concretes (SFRCs) with a different composition were studied in each of the groups. Hook steel fibres, 50-mm long and 0.8 mm in diameter, were used in the tested SFRCs. The latter had an average compressive strength of 35.17–59.18 MPa and a steel fibre content of 0, 25, 35, 50 and 65 kg per 1 m3 of the concrete mixture respectively. Functional dependences for the increase in shrinkage and creep strains over time are given. The problem of the effect of aggregate grading on creep strains is addressed. Conclusions concerning the rheological deformability of steel fibre reinforced concrete are drawn.
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Kovács, I. "Structural performance of steel fibre reinforced concrete — Part I. Overview of the experimental program." International Review of Applied Sciences and Engineering 5, no. 1 (June 1, 2014): 9–19. http://dx.doi.org/10.1556/irase.5.2014.1.2.
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Abstract The papers of the series deal with experimental characterisation of mechanical as well as structural properties of different steel fibre reinforced concretes that can be used for several structural applications. An extensive experimental programme (six years) has been developed to investigate the effect of steel fibre reinforcement on the mechanical performance and structural behaviour of concrete specimens. Specimens and test methods were selected to be able to detect realistic behaviour of the material, representing clear effect on the structural performance. Material compositions, test methods, type of test specimens will be detailed in the presented paper (Part I). Furthermore, compressive strength (Part II), stress-strain relationship (Part II), splitting strength (Part III) and toughness (Part IV) will also be discussed. In the light of the motivation to determine the structural performances of 1D concrete structural element affected by steel fibre reinforcement, bending and shear behaviour (Part V) as well as serviceability state (Part VI) of steel fibre reinforced concrete beams will be analysed. Since normal force — prestressing force — can affectively be used to improve the structural performances of RC element flexural tests were carried out on prestressed pretensioned steel fibre reinforced concrete beams (Part VII). Moreover, focusing on the in-plane state of stresses for 2D structures, behaviour of steel fibre reinforced concrete deep beams in shear and steel fibre reinforced concrete slabs (Part VIII) in bending will be explained. Finally, based on the wide range of the experimental and analytical studies on the presented field, a new material model for the 1D uniaxial behaviour (Part IX) and its possible extension to the 3D case (Part X) will be described hereafter. All papers will put emphasis on the short literature review of the last four decades.
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Zhao, Junliang, Chenhao Xu, Linzhu Sun, and Dongyan Wu. "Behaviour of FRP-confined compound concrete–filled circular thin steel tubes under axial compression." Advances in Structural Engineering 23, no. 9 (January 20, 2020): 1772–84. http://dx.doi.org/10.1177/1369433219900941.
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This article presents test results of a recent study on the axial compressive behaviour of fibre-reinforced polymer–confined compound concrete–filled thin steel tubes. The usage of compound concrete, which is a mixture of fresh concrete and large pieces of recycled concrete lumps, can recycle waste concrete in a simple but effective way. Totally, three series of tests were conducted, with the parameters including the relative strength between fresh concrete and recycled concrete lumps, the volumetric percentage (i.e. mix ratio) of recycled concrete lumps, the diameter-to-thickness ratio of the steel tubes, and the thickness of the fibre-reinforced polymer jackets being investigated. The stress–strain curves of the steel tube and compound concrete core were derived and the effects of different parameters were then examined and discussed. An existing stress–strain curve model of fibre-reinforced polymer–confined normal concrete-filled steel tubes was also found performing well in predicting the behaviour of fibre-reinforced polymer–confined compound concrete-filled steel tubes.
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Bhat, Arooba Rafiq, and Ajay Vikram. "A Literature Study of Hybrid Fibre Reinforced Concrete." International Journal of Innovative Research in Engineering & Management 10, no. 1 (February 1, 2023): 6–8. http://dx.doi.org/10.55524/ijirem.2023.10.1.2.
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The drawbacks are that the concrete has been improved by using hybrid fibre in concrete. By hybridization benefits from two different fibres are utilized in a single concrete mixture. The hybrids fibres studied are basalt-polypropylene fibre, polypropylene-steel fibre, steel-coconut fibre, polypropylene-e-waste fibre, polypropylene-polyvinyl Alcohol and steel-glass- polypropylene fibre. The properties that are improved using hybrid fibres are compressive strength, tensile strength, flexural strength, limited crack propagation, and improved durability of the concrete structure. In maximum cases slump value decrease with an increase in fibre percentage.
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Naraganti, Srinivasa Rao, Rama Mohan Rao Pannem, and Jagadeesh Putta. "Influence of Hybrid Fibres on Bond Strength of Concrete." International Journal of Mathematical, Engineering and Management Sciences 5, no. 2 (April 1, 2020): 353–62. http://dx.doi.org/10.33889/ijmems.2020.5.2.029.
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Bond strength between embedded bar and concrete plays vital role in the design of various reinforced concrete structural elements. Use of metallic and synthetic fibres has been shown to be an effective method to enhance tensile strength, reduce shrinkage and improve durability properties of concrete. However, making of synthetic fibres will not only deplete the natural hydrocarbon resources, but also add greenhouse pollutants to the environment. Hence, sisal fibre was considered as a potential alternative to polypropylene fibre. An experimental study was conducted to evaluate the influence of sisal fibres as mono-fibre and in combination with steel as hybrid fibre on bond strength of concrete. The performance of steel polypropylene fibre reinforced concrete (SPFRC) is compared with that of steel sisal fibre reinforced concrete (SSiFRC). Bond strength was conducted onM30 grade concrete for curing periods of 7, 28 and 90 days. Fibre dosages of 0.50%, 1.00%, 1.25% and 1.50% by volume of concrete were used. Results indicated that increase in steel fibre dosage improved the bond strength slightly. However, increase in fibre dosage of either PP fibres or sisal fibres resulted decrease in bond strength. Furthermore, sisal fibre reinforced concrete (SiFRC) showed inferior performance in bond strength as compared to polypropylene fibre reinforced concrete (PFRC). A detailed statistical analysis revealed that although no strong correlation between the compressive strength and the bond strength was evident from the experimental study, means of bond strength of both the hybrid groups did not differ significantly. In addition, empirical equations were proposed to predict the bond strength of fibre reinforced concrete (FRC) based on compressive strength.
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Teng, Jin-Guang, Bing Zhang, Shishun Zhang, and Bing Fu. "Steel-free hybrid reinforcing bars for concrete structures." Advances in Structural Engineering 21, no. 16 (December 2018): 2617–22. http://dx.doi.org/10.1177/1369433218818772.
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Extensive research has been conducted on the replacement of steel rebars with fibre-reinforced polymer rebars to eliminate the steel corrosion problem in conventional steel bar–reinforced concrete structures. However, as the performance of fibre-reinforced polymer rebars is substantially inferior in compression (due to issues such as fibre micro-buckling) than in tension, their use in concrete columns is generally not recommended; this poses a significant challenge when a steel-free structure is needed. This article presents a novel steel-free hybrid rebar developed at The Hong Kong Polytechnic University that overcomes the above-mentioned problem. Such a hybrid rebar typically consists of a central fibre-reinforced polymer rebar, an external fibre-reinforced polymer confining tube and an annular layer of high-strength cementitious material such as ultrahigh-performance concrete. To demonstrate the performance of these hybrid rebars, results from a series of preliminary tests and associated modelling work are presented in the article. These results indicate that (1) the fibre-reinforced polymer rebar at the centre is well supported against bar buckling and fibre micro-buckling, (2) the compressive strength of the fibre-reinforced polymer material can be fully mobilized and (3) the stress–strain response of hybrid rebars can be designed to resemble an elastic–plastic response with some post-yielding hardening.
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Li, Fangyuan, Yunxuan Cui, Chengyuan Cao, and Peifeng Wu. "Experimental study of the tensile and flexural mechanical properties of directionally distributed steel fibre-reinforced concrete." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 9 (June 20, 2018): 1721–32. http://dx.doi.org/10.1177/1464420718782555.
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Directionally distributed steel fibre-reinforced concrete has been proposed as a novel concrete because of its high tensile strength and crack resistance in specific directions. Based on the existing studies of the effect of the fibre direction on the mechanical properties of fibre-reinforced concrete, the authors in this paper performed further studies of the mechanical properties of directionally distributed steel fibre-reinforced concrete by conducting split tensile and bending tests. The split tensile strength of the directionally distributed fibre-reinforced concrete clearly exhibited anisotropy. The split tensile strength perpendicular to the fibre direction was much higher than that parallel to the fibre direction. The split tensile strength perpendicular to the fibre direction was almost twice the tensile strength of plain concrete. The flexural performance of directionally distributed fibre-reinforced concrete in the fibre direction significantly improved compared to that of randomly distributed fibre-reinforced concrete. Specifically, the flexural strength increased by as much as 97%. Gravity resulted in a deviation in the tensile properties of concrete prepared by manually and directionally placing fibres in a layered casting process. The test results can be utilised in subsequent concrete designs. The conclusions reached in this paper provide comprehensive mechanical design parameters for the application of directionally distributed fibre-reinforced concrete.
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Hao, Yifei, Xin Huang, and Hong Hao. "Mesoscale modelling of concrete reinforced with spiral steel fibres under dynamic splitting tension." Advances in Structural Engineering 21, no. 8 (October 10, 2017): 1197–210. http://dx.doi.org/10.1177/1369433217734654.
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The addition of discrete steel fibres into concrete has been widely recognised as an effective measure to enhance the ductility, post-cracking resistance and energy absorption of the matrix subjected to impact loads. Despite useful information from experimental studies that investigate the macro-scale performance of steel fibre–reinforced concrete under dynamically applied loadings, results from a series of tests or from tests by different researchers are often found to be scattered. Besides variations in testing conditions, random variations of size, location and orientation of aggregates and fibres in steel fibre–reinforced concrete are deemed the fundamental reason of the scattering test data. High-fidelity modelling of concrete and steel fibre–reinforced concrete in mesoscale has been widely adopted to understand the influence of each component in the composite material. Numerical studies have been published to discuss the behaviour of steel fibre–reinforced concrete under dynamic splitting tension. Different shapes, for example, circles, ovals and polygons, of coarse aggregates were considered in different studies, and different conclusions were drawn. This study investigates the influence of the shape of aggregates on numerical prediction in mesoscale modelling of steel fibre–reinforced concrete materials with spiral fibres under dynamic splitting tension in terms of the strain distribution, cracking pattern and strength. The numerical model is validated by experimental results. It is found that the shape of aggregates in mesoscale modelling of splitting tensile tests has negligible influence. Furthermore, steel fibre–reinforced concrete specimens with different volume fractions of spiral fibres from 0.5% to 3.0% under various loading rates are simulated. Results from parametric simulations indicate the optimal dosage of spiral fibres in steel fibre–reinforced concrete mix with respect to the construction cost and mechanical property control.
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Kovács, I. "Structural performance of steel fibre reinforced concrete — Part III. Behaviour in tension." International Review of Applied Sciences and Engineering 5, no. 2 (December 1, 2014): 105–17. http://dx.doi.org/10.1556/irase.5.2014.2.2.
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The present paper of a series deals with the experimental characterisation of tensile splitting strength and compressive behaviour of different structural concrete containing different volume of steel fibre reinforcement (0 V%, 0.5 V%, 1.0 V%, 75 kg/m3, 150 kg/m3) and different configuration of steel fibres (crimped, hooked-end). Tensile splitting tests were carried out on standard cylinder (∅ = 150 mm, l = 300 mm) specimens (so-called Brazilian test) considering random fibre orientation. Since the fibre orientation may significantly affect the tensile behaviour test series were also performed on cross-section (100 mm × 100 mm) of steel fibre reinforced concrete beams (100 mm × 100 mm × 240 mm) sawn out of steel fibre reinforced slab elements. Taken as a whole behaviour of steel fibre reinforced concrete was examined in tension taking into consideration different experimental parameters such as fibre content, type of fibres, fibre configuration, fibre orientation, size of specimens (size effect) and concrete mixture.
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Li, Zhengwei, Meizhong Wu, Jiawei Wu, Yujun Cui, and Xingwei Xue. "Steel Fibre Reinforced Concrete Meso-Scale Numerical Analysis." Advances in Civil Engineering 2020 (December 24, 2020): 1–16. http://dx.doi.org/10.1155/2020/2084646.
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Concrete is a heterogeneous composite consisting of aggregate, cement paste, and void. Steel fibre reinforced concrete (SFRC) has been widely studied experimentally and numerically in recent decades. The fibre geometry model program generated by a secondary development ANSYS program was exported to midas FEA for analysis. The constitutive concrete model adopts the total strain crack model of concrete. A steel fibre bond slip is considered in an equivalent manner using the von Mises model. The results of the three-dimensional meso-scale numerical analysis method agree well with the experimental values of steel fibre concrete beams.
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Novikov, M. F., and Yu I. Kozyreva. "The ways to increase the durability of cutting tools (sintered carbide knives) in the production of steel fiber." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 1 (March 26, 2021): 95–99. http://dx.doi.org/10.21122/1683-6065-2021-1-95-99.
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One of the ways to increase the strength and reliability of building structures is the use of steel – fibre reinforced concrete. Steel – fibre reinforced concrete has significant advantages over conventional concrete. A high degree of resistance to cracking contributes to an increase in such physical and mechanical parameters as compressive, tensile and bending strength, water resistance, frost resistance, resistance to water and chemical penetration. In steel – fibre reinforced concrete, steel – fibre is used as a reinforcing material, evenly distributed over the volume of concrete.In the process of steel – fibre production, the fiber is cut with carbide knives. The article deals with the issues of increasing the wear resistance of carbide knives used for cutting steel – fibre, and suggests ways to increase the durability of cutting tools. The influence of the quality of tungsten-cobalt hard alloy on the wear resistance of knives is analyzed, and a knife attachment device is developed.
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Cleven, Simon, Michael Raupach, and Thomas Matschei. "Electrical Resistivity of Steel Fibre-Reinforced Concrete—Influencing Parameters." Materials 14, no. 12 (June 20, 2021): 3408. http://dx.doi.org/10.3390/ma14123408.
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This paper presents a systematic study of the electrical resistivity of different steel fibre-reinforced concretes with fibre contents from 0 kg/m3 to 80 kg/m3 in order to identify possible effects of interactions among concrete composition and fibre type and content regarding electrical resistivity. Based on a literature review, four parameters, w/c ratio, binder content, ground granulated blast-furnace slag (GGBS) and fineness of cement, which show a significant influence on the electrical resistivity of plain concrete, were identified, and their influence on the electrical resistivity as well as interaction effects were investigated. The results of the experiments highlight that the addition of fibres leads to a significant decrease in electrical resistivity, independent of all additional parameters of the concrete composition. Additionally, it was shown that a higher porosity of the concrete, e.g., due to a higher w/c ratio, also results in a lower electrical resistivity. These results are in agreement with the literature review on plain concrete, while the influence of the concrete composition on the electrical resistivity is weaker with the increase in fibre content. The influence of fibre reinforcement is thus not affected by changes in the concrete composition. In general, a higher fibre dosage leads to a decrease in electrical resistivity, but the impact on the electrical resistivity varies slightly with different types of steel fibres. Based on this study, the potential of determining the fibre content using electrical resistivity measurements could be clearly presented.
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Hao, Yi Fei, Hong Hao, and Gang Chen. "Experimental Tests of Steel Fibre Reinforced Concrete Beams under Drop-Weight Impacts." Key Engineering Materials 626 (August 2014): 311–16. http://dx.doi.org/10.4028/www.scientific.net/kem.626.311.
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Concrete is a brittle material, especially under tension. Intensive researches have been reported to add various types of fibres into concrete mix to increase its ductility. Recently, the authors proposed a new type of steel fibre with spiral shape to reinforce concrete material. Laboratory tests on concrete cylinder specimens demonstrated that compared to other fibre types such as the hooked-end, deformed and corrugated fibres the new fibres have larger displacement capacity and provide better bonding with the concrete. This study performs drop-weight impact tests to investigate the behaviour of concrete beams reinforced by different types of steel fibres. The quasi-static compressive and split tensile tests were also conducted to obtain the static properties of plain concrete and steel fibre reinforced concrete (FRC) materials. The quasi-static tests were carried out using hydraulic testing machine and the impact tests were conducted using an instrumented drop-weight testing system. Plain concrete and concrete reinforced by the commonly used hooked-end steel fibres and the proposed spiral-shaped steel fibres were tested in this study. The volume dosage of 1% fibre was used to prepare all FRC specimens. Repeated drop-weight impacts were applied to the beam specimens until total collapse. A 15.2 kg hard steel was used as the drop-weight impactor. A drop height of 0.5 m was considered in performing the impact tests. The force-displacement relations and the energy absorption capabilities of plain concrete and FRC beams were obtained, compared and discussed. The advantage and effectiveness of the newly proposed spiral-shaped steel fibres in increasing the performance of FRC beam elements under impact loads were examined.
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Hasham, Md, V. Reddy Srinivasa, M. V. Seshagiri Rao, and S. Shrihari. "Flexural behaviour of basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars." E3S Web of Conferences 309 (2021): 01055. http://dx.doi.org/10.1051/e3sconf/202130901055.
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In this paper, the flexural behaviour of M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars are studied and compared with slabs made with steel rebars. The optimum percentage of basalt is 0.3% for 50mm length basalt fibres. Due to high particle packing density in concrete made with basalt fibre micro cracks are prevented due to enhanced fatigue and stress dissipation capacity. Addition of basalt fibres to enhances the energy absorbtion capacity or toughness thereby enhancing the resistance to local damage and spalling. Addition of basalt fibres controlled the crack growth and crack width. Load at first crack of M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars is more than M30 grade conventional concrete slabs made with steel rebars because the with addition of basalt and BFRP bars will make either the interfacial transition zone (ITZ) strong or due to bond strength of concrete slabs made with basalt fibre reinforced polymer rebars. The ultimate strength in M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars is more than conventional concrete slabs made with steel rebars. Deflection at the centre of M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars is almost double than the conventional concrete slabs made with steel rebars. Toughness indices evaluated for M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars indicates that basalt fibre and BFRP bars will enhance the energy absorbtion capacity of slabs.
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Yew, Ming Kun, and Othman Ismail. "Mechanical Properties of Hybrid Nylon-Steel- and Steel-Fibre-Reinforced High Strength Concrete at Low Fibre Volume Fraction." Advanced Materials Research 168-170 (December 2010): 1704–7. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1704.
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The mechanical properties of hybrid nylon-steel-fiber-reinforced concrete were investigated in comparison to that of the steel-fiber-reinforced concrete, at the same volume fraction (0.5%). The combining of fibers, often called hybridization is investigated in this paper for a very high strength concrete of an average compressive strength of 105 MPa. Test results showed that fibers when used in a hybrid nylon-steel fibers reinforced concrete form could result in superior composite performance compared to steel-fiber-reinforced concrete. The basic property of the hybridized material that was evaluated and analyzed extensively was the modulus of rupture (MOR) and splitting tensile while the compressive strength was only slightly decreased compared to single steel fiber reinforced concrete. There is a synergy effect in the hybrid fibers system.
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More, Florence More Dattu Shanker, and Senthil Selvan Subramanian. "Impact of Fibres on the Mechanical and Durable Behaviour of Fibre-Reinforced Concrete." Buildings 12, no. 9 (September 13, 2022): 1436. http://dx.doi.org/10.3390/buildings12091436.
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Numerous studies have been conducted recently on fibre reinforced concrete (FRC), a material that is frequently utilized in the building sector. The utilization of FRC has grown in relevance recently due to its enhanced mechanical qualities over normal concrete. Due to increased environmental degradation in recent years, natural fibres were developed and research is underway with the goal of implementing them in the construction industry. In this work, several natural and artificial fibres, including glass, carbon, steel, jute, coir, and sisal fibres are used to experimentally investigate the mechanical and durability properties of fibre-reinforced concrete. The fibres were added to the M40 concrete mix with a volumetric ratio of 0%, 0.5%, 1.0%, 1.5%, 2.0% and 2.5%. The compressive strength of the conventional concrete and fibre reinforced concrete with the addition of 1.5% steel, 1.5% carbon, 1.0% glass, 2.0% coir, 1.5% jute and 1.5% sisal fibres were 4.2 N/mm2, 45.7 N/mm2, 41.5 N/mm2, 45.7 N/mm2, 46.6 N/mm2, 45.7 N/mm2 and 45.9 N/mm2, respectively. Comparing steel fibre reinforced concrete to regular concrete results in a 13.69% improvement in compressive strength. Similarly, the compressive strengths were increased by 3.24%, 13.69%, 15.92%, 13.68% and 14.18% for carbon, glass, coir, jute, and sisal fibre reinforced concrete respectively when equated with plain concrete. With the optimum fraction of fibre reinforced concrete, mechanical and durability qualities were experimentally investigated. A variety of durability conditions, including the Rapid Chloride Permeability Test, water absorption, porosity, sorptivity, acid attack, alkali attack, and sulphate attack, were used to study the behaviour of fiber reinforced concrete. When compared to conventional concrete, natural fibre reinforced concrete was found to have higher water absorption and sorptivity. The rate of acid and chloride attacks on concrete reinforced with natural fibres was significantly high. The artificial fibre reinforced concrete was found to be more efficient than the natural fibre reinforced concrete. The load bearing capacity, anchorage and the ductility of the concrete improved with the addition of fibres. According to the experimental findings, artificial fibre reinforced concrete can be employed to increase the structure’s strength and longevity as well as to postpone the propagation of cracks. A microstructural analysis of concrete was conducted to ascertain its morphological characteristics.
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Jahandari, Soheil, Masoud Mohammadi, Aida Rahmani, Masoumeh Abolhasani, Hania Miraki, Leili Mohammadifar, Mostafa Kazemi, Mohammad Saberian, and Maria Rashidi. "Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres." Materials 14, no. 22 (November 21, 2021): 7065. http://dx.doi.org/10.3390/ma14227065.
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In this study, the impact of steel fibres and Silica Fume (SF) on the mechanical properties of recycled aggregate concretes made of two different types of Recycled Coarse Aggregates (RCA) sourced from both low- and high-strength concretes were evaluated through conducting 60 compressive strength tests. The RCAs were used as replacement levels of 50% and 100% of Natural Coarse Aggregates (NCA). Hook-end steel fibres and SF were also used in the mixtures at the optimised replacement levels of 1% and 8%, respectively. The results showed that the addition of both types of RCA adversely affected the compressive strength of concrete. However, the incorporation of SF led to compressive strength development in both types of concretes. The most significant improvement in terms of comparable concrete strength and peak strain with ordinary concrete at 28 days was observed in the case of using a combination of steel fibres and SF in both recycled aggregate concretes, especially with RCA sourced from high strength concrete. Although using SF slightly increased the elastic modulus of both recycled aggregate concretes, a substantial improvement in strength was observed due to the reinforcement with steel fibre and the coexistence of steel fibre and SF. Moreover, existing models to predict the elastic modulus of both non-fibrous and fibrous concretes are found to underestimate the elastic modulus values. The incorporation of SF changed the compressive stress-strain curves for both types of RCA. The addition of steel fibre and SF remarkably improved the post-peak ductility of recycled aggregates concretes of both types, with the most significant improvement observed in the case of RCA sourced from a low-strength parent concrete. The existing model to estimate the compressive stress-strain curve for steel fibre-reinforced concrete with natural aggregates was found to reasonably predict the compressive stress-strain behaviour for steel fibres-reinforced concrete with recycled aggregate.
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Cleven, Simon, Michael Raupach, and Thomas Matschei. "A New Method to Determine the Steel Fibre Content of Existing Structures—Evaluation and Validation." Applied Sciences 12, no. 1 (January 4, 2022): 454. http://dx.doi.org/10.3390/app12010454.
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The in-situ measurement of the content and orientation of steel fibres in concrete structures is of great importance for the assessment of their specific mechanical properties, especially in the case of repair. For existing structures, the actual fibre content as well as the orientation of the fibres, which is based on many factors such as casting or compacting direction, is typically unknown. For structural maintenance or rehabilitation, those factors have to be determined in order to apply meaningful structural design calculations and plan necessary strengthening methods. For this reason, a new method based on the analysis of drilling cores of concrete structures has been established. The newly developed non-destructive test setup used in this research consists of a framework for cylindrical specimens in combination with an LCR meter to determine the electrical resistance of the fibre reinforced concrete. In combination with a suitable FEM model, concretes with fibre contents up 80 kg/m3 were analysed to derive a first model to assess the actual fibre content of steel fibre reinforced concretes. After a calibration of the literature’s equation by use of an adjusted aspect ratio for the analysis of drilling cores, the estimation of the fibre content is possible with high accuracy for the tested material combination. The results show that the newly developed test method is suitable for the rapid and non-destructive structural diagnosis of the fibre content of steel fibre reinforced concrete based on drilling cores using electrical resistivity measurements.
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Fleissig, Jan. "Influence of Steel Fibres in Steel Fibre Reinforced Concrete on ULS and SLS." Solid State Phenomena 259 (May 2017): 52–57. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.52.
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The steel fibre reinforced concrete is expensive compared with the ordinary concrete. The costs for the production, the transport and the setting of steel fibre reinforced concrete should be directly proportional to its quality. The quality of material can be quantified in a broad spectrum of properties (the workability, the mechanical and physical properties, the durability, etc.). This article is focused on the influence of mechanical and physical properties (the tensile strength and the residual tensile strength) on ULS and SLS. The paper is limited only to the bending load bearing capacity from ULS point of view and limited only to vertical deformation from SLS point of view. The example is a part of paper – the calculation of two bending structures. Firstly, it is calculated as the structure of ordinary reinforced concrete and secondly it is calculated as the structure of reinforced steel fibre reinforced concrete. The geometric arrangement, the type and the quantity of reinforcement are identical for both calculated structures. The calculated structures are different only in the tensile strength and the residual tensile strength. All other input parameters (including modulus of elasticity) are identical for both calculated structures, in order the influence of tensile strength on ULS and SLS excels. The presented results should be the basic concept for the effectiveness assessment of steel fibre reinforced concrete application.
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Leung, H. Y., and R. V. Balendran. "Flexural behaviour of concrete beams internally reinforced with GFRP rods and steel rebars." Structural Survey 21, no. 4 (October 1, 2003): 146–57. http://dx.doi.org/10.1108/02630800310507159.
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Use of fibre‐reinforced polymer (FRP) composite rods, in lieu of steel rebars, as the main flexural reinforcements in reinforced concrete (RC) beams have recently been suggested by many researchers. However, the development of FRP RC beam design is still stagnant in the construction industry and this may be attributed to a number of reasons such as the high cost of FRP rods compared to steel rebars and the reduced member ductility due to the brittleness of FRP rods. To resolve these problems, one of the possible methods is to adopt both FRP rods and steel rebars to internally reinforce the concrete members. The effectiveness of this new reinforcing system remains problematic and continued research in this area is needed. An experimental study on the load‐deflection behaviour of concrete beams internally reinforced with glass fibre‐reinforced polymer (GFRP) rods and steel rebars was therefore conducted and some important findings are summarized in this paper.
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Abd Rahman, Norashidah, Siti Amirah Azra Khairuddin, Norwati Jamaluddin, and Zainorizuan Mohd Jaini. "Strength of Reinforced Fibrous Foamed Concrete-Filled Hollow Section." Materials Science Forum 936 (October 2018): 219–23. http://dx.doi.org/10.4028/www.scientific.net/msf.936.219.
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At present, research on concrete-filled sections extends to using lightweight concrete to reduce the total weight of such structures. However, research on concrete-filled hollow sections (CFHS) using foamed concrete remains ongoing. Therefore, this study was conducted to determine the strength of reinforced fibrous foamed CFHSs. Two types of fibre, namely, steel and polypropylene fibres, were used. A short-column specimen was prepared and tested under compression load. Result shows that adding steel fibre to foamed concrete indicates a higher strength than adding polypropylene fibre. The strength of the CFHS is increased by adding reinforced bar and fibre in foamed concrete.
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Kovács, I. "Structural performance of steel fibre reinforced concrete — Part II. Compressive behaviour and stress-strain relationship." International Review of Applied Sciences and Engineering 5, no. 1 (June 1, 2014): 21–33. http://dx.doi.org/10.1556/irase.5.2014.1.3.
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Abstract The present paper of a series deals with the experimental characterisation of compressive strength and compressive behaviour (stress-strain relationship) of different structural concrete containing different volume of steel fibre reinforcement (0 V%, 0.5V%, 1.0V%, 75 kg/m3, 150 kg/m3) and different configuration of steel fibres (crimped, hooked-end). Compressive tests were carried out on standard cube (150 mm × 150 mm × 150 mm) and cylinder (Ø = 150 mm, l = 300 mm) specimens considering random fibre orientation. Since the fibre orientation may significantly affect the compressive behaviour, test series were also performed on cylinders (Ø = 70 mm, l = 100 mm) drilled out of fibre reinforced concrete beams and prisms (100 mm × 100 mm × 240 mm) sawn out of steel fibre reinforced deep beams. Throughout the tests stress-strain relationships were registered on the standard cube and cylinder specimens as well. In conclusion, behaviour of steel fibre reinforced concrete was examined in compression taking into consideration different experimental parameters such as fibre content, type of fibres, fibre configuration, fibre orientation, size of specimens (size effect) and concrete mixture.
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Kobaka, Janusz. "A Statistical Model of Fibre Distribution in a Steel Fibre Reinforced Concrete." Materials 14, no. 23 (November 29, 2021): 7297. http://dx.doi.org/10.3390/ma14237297.
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The aim of the research was to create a model of steel fibre distribution in a Steel Fibre Reinforced Concrete space using statistical probability means. The model was created in order to better understand the behaviour of the composite under operating conditions. Four statistical distributions (Beta, Kumaraswamy, Three Parameter Beta and Generalised Transmuted Kumaraswamy) were examined to find the distribution that best described fibre settling phenomenon caused by manufacturing process conditions. In the next stage the chosen statistical distribution was adapted to create the model of steel fibre distribution in a Steel Fibre Reinforced Concrete space. The model took into account technological conditions such as vibrating time and properties such as consistency of the tested concrete. The model showed a good agreement with the real fibre distribution.
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Prasad. K, Ram, Murali G, Parthiban Kathirve, Haridharan M K, and Karthikeyan K. "Experimental Study on Functionally Graded Steel Fibre Reinforced Preplaced Aggregate Concrete." International Journal of Engineering & Technology 7, no. 3.12 (July 20, 2018): 456. http://dx.doi.org/10.14419/ijet.v7i3.12.16129.
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This study examines compressive strength of this functionally graded steel fibre reinforced concrete (FGFRPAC). A five mixes were prepared and tested in the present study. The first series of FGFRPAC were prepared and reinforced in three layers of 3%, 1.5% and 3% with crimped, hooked end. The second series were reinforced with 2.5% steel fibre equally in all the three layers. The average amount of fibre used in FGFRPAC specimen was 2.5% which is similar to the fibre dosage used in the second series were the fibres are equally spread in all the three layers. The gathered results revealed that employing FGFRPAC leads to more enhancement in compressive strength than conventional steel fibre reinforced concrete.
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Suman, Sanjeev, Gourav Tiwari, Abhay Kumar Jha, and Barun Kumar. "Structural Behaviour of Hybrid Fibres Concrete Using Regression Analysis." International Journal for Research in Applied Science and Engineering Technology 11, no. 3 (March 31, 2023): 173–77. http://dx.doi.org/10.22214/ijraset.2023.49216.
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Abstract: The main objective of the current effort is to create hybrid fibre reinforced concrete with improved strength properties, structural behaviour, and structural performance by adding the right dosage amount of hybrid fibre. In this work, it is suggested to employ hybrid fibres of two different types, one of which is Steel fibre, a metallic fibre, and the other is Polyvinyl Alcohol fibre, which has a synthetic foundation. In this way, the concrete gains high tensile strength, flexural strength, and compressive strength due to the inclusion of steel fibre with a high Young's modulus and tensile strength. The steel fibre functions as a crack arrestor, stopping the growth of cracks at the macro level. The microscopic cracks are stopped from spreading by the use of synthetic Polyvinyl Alcohol (PVA) fibre, which is more flexible and ductile, increasing the strength and hardness of the concrete. The objective of the current study is to assess the structural behaviour and strength features of hybrid fibre reinforced concrete. For different mix proportions, such as 0% Steel fibre and 1% PVA fibre, 0.25% Steel fibre and 0.75% PVA fibre, 0.50% Steel fibre and 0.50% PVA fibre, 0.75% Steel fibre and 0.25% PVA fibre, and 1% Steel fibre and 0% PVA fibre by the volume of concrete, the specimens were cast with the addition of hybrid fibres at a total volume fraction of 1%.
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Hossain, Muhammad Monowar, Safat Al-Deen, Md Kamrul Hassan, Sukanta Kumer Shill, Md Abdul Kader, and Wayne Hutchison. "Mechanical and Thermal Properties of Hybrid Fibre-Reinforced Concrete Exposed to Recurrent High Temperature and Aviation Oil." Materials 14, no. 11 (May 21, 2021): 2725. http://dx.doi.org/10.3390/ma14112725.
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Over the years, leaked fluids from aircraft have caused severe deterioration of airfield pavement. The combined effect of hot exhaust from the auxiliary power unit of military aircraft and spilt aviation oils have caused rapid pavement spalling. If the disintegrated concreted pieces caused by spalling are sucked into the jet engine, they may cause catastrophic damage to the aircraft engine or physical injury to maintenance crews. This study investigates the effectiveness of incorporating hybrid fibres into ordinary concrete to improve the residual mechanical and thermal properties to prevent spalling damage of pavement. Three fibre-reinforced concrete samples were made with micro steel fibre and polyvinyl alcohol fibre with a fibre content of zero, 0.3%, 0.5% and 0.7% by volume fraction. These samples were exposed to recurring high temperatures and aviation oils. Tests were conducted to measure the effects of repeated exposure on the concrete’s mechanical, thermal and chemical characteristics. The results showed that polyvinyl alcohol fibre-, steel fibre- and hybrid fibre-reinforced concrete suffered a 52%, 40% and 26.23% of loss of initial the compressive strength after 60 cycles of exposure to the conditions. Moreover, due to the hybridisation of concrete, flexural strength and thermal conductivity was increased by 47% and 22%. Thus, hybrid fibre-reinforced concrete performed better in retaining higher residual properties and exhibited no spalling of concrete.
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Zhang, Shishun, and Tao Yu. "Fibre-reinforced polymer strengthening and fibre Bragg grating–based monitoring of reinforced concrete cantilever slabs with insufficient anchorage length of steel bars." Advances in Structural Engineering 20, no. 11 (February 1, 2017): 1684–98. http://dx.doi.org/10.1177/1369433217691774.
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Reinforced concrete cantilever slabs are among structures that are most likely to develop structural integrity problems, as they are statically determinate and often exposed to the outdoor environment. This article presents an experimental study on the strengthening of reinforced concrete cantilever slabs where the anchorage of the top steel reinforcing bars into the adjacent wall was insufficient. The experimental study involved the use of a fibre-reinforced polymer strengthening system and fibre Bragg grating sensors for strain monitoring. The fibre-reinforced polymer strengthening system consisted of glass fibre–reinforced polymer sheets and glass fibre–reinforced polymer spike anchors which connected the glass fibre–reinforced polymer sheets to the adjacent concrete wall. The test results showed that the fibre-reinforced polymer strengthening system was effective in improving the load-carrying capacity of reinforced concrete cantilever slabs and the fibre Bragg grating sensors worked efficiently and reliably for strain monitoring. The debonding in glass fibre–reinforced polymer sheet/glass fibre–reinforced polymer anchor-to-concrete bonded joints was found to be a progressive process associated with an increasing load. The fibre-reinforced polymer strengthening system examined in this study is thus a potential ductile solution for deficient cantilever slabs.
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Iqbal Khan, Mohammad, and Aref A. Abadel. "Numerical Modeling of Steel Fiber-Reinforced Beam." Applied Mechanics and Materials 377 (August 2013): 22–27. http://dx.doi.org/10.4028/www.scientific.net/amm.377.22.
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Steel fibre reinforced concrete is emerging very popular and attractive material in structural engineering because of its enhanced mechanical performance as compared to conventional concrete. It is well established that one of the important properties of steel fibre reinforced concrete (SFRC) is its superior resistance to cracking and crack propagation. Additionally, incorporation of fibres in the concrete enhances the compressive, tensile and shear strengths, flexural toughness, durability and resistance to impact. The mechanical properties of fibre reinforced concrete depend on the type and specification of fibres. In this paper numerical investigation of SFRC beam using ANSYS is presented. The analysis was conducted till the ultimate failure cracks. Eight-noded solid brick elements were used to model the concrete. Internal reinforcement was modeled by using 3D spar elements. It has been observed the results from the finite element failure behavior indicates a good agreement with the experimental failure behavior.
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Hubertova, Michala, and Rudolf Hela. "Lightweight Fibre Reinforced Concrete." Solid State Phenomena 249 (April 2016): 28–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.249.28.
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The use of fibre reinforcement in normalweight concrete technology is commonly used in practice. In the area of lightweight concrete, for example with use of expanded clay aggregate, there is not widely used this type of technology. The paper describes the experimental verification of various doses of steel fibres in two types of bulk and compressive class of lightweight expanded clay aggregate concrete and its influence on the physical and mechanical properties of hardened concrete – compressive and flexural strength, stress-strain diagram.
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More, Florence More Dattu Shanker, and Senthil Selvan Subramanian. "Experimental Investigation on the Axial Compressive Behaviour of Cold-Formed Steel-Concrete Composite Columns Infilled with Various Types of Fibre-Reinforced Concrete." Buildings 13, no. 1 (January 6, 2023): 151. http://dx.doi.org/10.3390/buildings13010151.
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The exceptional structural strength and low cost of steel-concrete composite columns make them a popular choice for civil engineering structures. Numerous forms of composite columns, including steel tubes filled with concrete, have been produced recently in response to various construction situations. Cold-formed steel tubular columns with concrete filling have higher strength and ductility due to their capacity to withstand inner buckling and postpone outward buckling. The objective of this research is to determine the ductile and strength performance of composite columns containing various forms of fibre-reinforced concrete when subjected to axial compression. Several different kinds of fibre-reinforced concrete (FRC) are employed as additives in hollow steel columns, including steel FRC, carbon FRC, glass FRC, coir FRC, jute FRC, and sisal FRC. Axial compression tests were performed on 24 columns, including three hollow steel columns and 21 composite columns. Three distinct slenderness ratios were developed and used. Axial bearing capacity, compressive stress-strain curves, ductility, peak strain, axial shortening, and toughness were among the topics covered by the axial compression test. Experimental findings demonstrated that all conventional composite columns experienced failure through overall buckling, Local buckling and crushing of concrete infill, which was transformed into more ductile failure using fibre-reinforced concrete infills. The test results revealed that fibre-reinforced concrete-infilled steel columns outperformed conventional composite columns in terms of strength, ductility, and energy absorption capacity. The percentage increase in load-carrying capacity was observed as 203.88%, 193.48% and 190.03% when compared to hollow cold-formed steel tubular columns in stub, short and medium columns, respectively. Under assessment of stub, short, and medium columns, the load-strain plots demonstrated that the steel fibre-reinforced concrete in-filled columns performed well in terms of ductility. Localized buckling and crushing of the concrete infill caused the composite columns with low slenderness ratios to fail. In contrast, concrete-filled steel tube columns with higher slenderness ratios showed column failure through the overall buckling of the composite column.
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Aslani, Farhad, and Shami Nejadi. "Bond characteristics of steel fibre reinforced self-compacting concrete." Canadian Journal of Civil Engineering 39, no. 7 (July 2012): 834–48. http://dx.doi.org/10.1139/l2012-069.
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Steel fibre reinforced self-compacting concrete (SFRSCC) is a relatively new composite material that combines the benefits of the self-compacting concrete (SCC) technology with the advantages derived from the fibre addition to a brittle cementitious matrix. Steel fibres improve many of the properties of SCC elements including tensile strength, ductility, toughness, energy absorption capacity, fracture toughness and cracking. Although the available research regarding the influence of steel fibres on the properties of SFRSCC is limited, this paper investigates the bond characteristics between steel fibre and SCC. Based on the available experimental results, the current analytical steel fibre pullout model is modified by considering the different SCC properties and different fibre types (smooth, hooked) and fibre inclination. To take into account the effect of fibre inclination in the pullout model, apparent shear strengths (τ(app)) and slip coefficient (β) are incorporated to express the variation of pullout peak load and the augmentation of peak slip as the inclined angle increases. These variables are expressed as functions of the inclined angle (ϕ).
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Solahuddin, B. A. "Strengthening of Reinforced Concrete with Steel Fibre: A Review." Materials Science Forum 1056 (March 14, 2022): 81–86. http://dx.doi.org/10.4028/p-3g0h57.
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Cement, sand, aggregate, water and reinforcing bar are the materials in reinforced concrete, while a mixture without reinforcing bar is known as concrete. Concrete and reinforced concrete is the most widely used building material in the construction industry. Brittleness occurs when concrete is unable to withstand tensile loading, resulting in brittle failure. Moreover, fibre has the potential to improve the tensile strength of concrete. Due to this fact, steel fibre reinforced concrete (SFRC) exhibits superior resistance to cracking. It intends to increase the durability and decrease the crack deformation characteristics. This review article discusses the theoretical aspects of SFRC. Numerous references from both early and contemporary writers are included to help tie the subject together chronologically. This historical analysis aims to provide context for what is currently known about SFRC rather than to provide historical reporting. Hence, this paper discusses a review on the strengthening of reinforced concrete with steel fibre based on previous research before this.
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Xu, Shenchun, Chengqing Wu, Zhongxian Liu, and Jun Li. "Numerical study of ultra-high-performance steel fibre–reinforced concrete columns under monotonic push loading." Advances in Structural Engineering 21, no. 8 (December 21, 2017): 1234–48. http://dx.doi.org/10.1177/1369433217747710.
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A finite element model is developed to investigate the behaviour of ultra-high-performance steel fibre–reinforced concrete columns under combined axial compression and horizontal monotonic push loading. The effects of steel fibre content, axial compression ratio, reinforcement ratio (or rebar ratio), stirrup ratio and shear span ratio on the structural behaviour of ultra-high-performance steel fibre–reinforced concrete columns are investigated in detail. The numerical model shows good agreement in bond–slip behaviour of specimens based on CEB model results and numerical results, and such behaviour should be taken into consideration in engineering practice. The results indicate that the developed finite element model could predict the structural behaviour and failure mode of ultra-high-performance steel fibre–reinforced concrete columns effectively. It is found that the reinforcement ratio, axial compression ratio, shear span ratio and volume fraction of steel fibre have a great influence on both the structural behaviour and failure modes of specimens.
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Zhang, Guoxue, Yingfeng Wang, Shixiang Xu, Juan Lu, and Yangyang Zhou. "Experimental on Impact Mechanical Behavior of the Carbon Fibre Reinforced Plastic-Reinforced Stainless Steel Reinforced Concrete Piers." Science of Advanced Materials 12, no. 5 (May 1, 2020): 769–77. http://dx.doi.org/10.1166/sam.2020.3734.
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To study the impact resistance of the stainless steel reinforced concrete after reinforced with CFRP (Carbon Fibre Reinforced Plastic), the multifunction ultra-high heavy drop hammer test system was adopted to conduct multiple horizontal impact test research on three stainless steel reinforced concrete piers before and after they are reinforced. The test results showed that with equal impact energy, the maximum impact force of the stainless steel reinforced concrete piers was larger than that of the stainless steel reinforced concrete piers that were reinforced with CFRP, while after the concrete piers were reinforced, the peak displacement of the piers was obviously smaller than that before they were reinforced and the residual deformation also became smaller, which improved the flexural rigidity of the section. And the local anti-damage capacity can be improved so as to lengthen the life of structures by reinforcing the stainless steel reinforced concrete pier with carbon fiber.
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Lathamaheswari, R., R. BalaKeerthana, K. Nandhini, B. Parkavi, and A. Nivedha. "Study on GFRP Reinforced Beams under Flexure." International Journal of Emerging Research in Management and Technology 6, no. 7 (June 29, 2018): 156. http://dx.doi.org/10.23956/ijermt.v6i7.205.
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Acute shortage of raw materials and deterioration of reinforced concrete structural elements lead to implementation of new substitute materials and innovative technologies. Reinforced Cement Concrete structures are usually reinforced with steel bars which are subjected to corrosion at critical temperature and atmospheric conditions. The structures can also be reinforced with other materials like Fibre Reinforced Polymers (FRP). In this line Fibre Reinforced Polymer based reinforcement replacing conventional steel rod for a precast element of a prefabricated structure is considered. The precast member cast out of M25 grade concrete reinforced exclusively with locally produced Glass Fibre Reinforced Polymer (GFRP) bars including GFRP stirrups is designed, cast. Flexural behaviour of rectangular concrete beams reinforced with FRP bars and stirrups is examined with two specimens one with conventional sand as fine aggregate and another with quarry dust as fine aggregate. The load at cracking and ultimate, type of failure and crack patterns are observed and compared with those of conventional cement concrete.
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Köroğlu, Mehmet Alpaslan, and Nebi Özdöner. "Behavioural Study of Steel Fiber and Polypropylene Fibre Reinforced Concrete." Key Engineering Materials 708 (September 2016): 59–63. http://dx.doi.org/10.4028/www.scientific.net/kem.708.59.
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Fibres are generally used as resistance of cracking and strengthening of concrete. The purpose of this research is to investigate the strength and mechanical properties of plain concrete, steel fibre reinforced concrete and polypropylene fibre reinforced concrete. The main focus of this investigation is to understand the reinforcement material’s behaviour on concrete and to compare the effect of increasing fibres on the concrete. The percentages of fibre used for both types of concrete were 0.5%, 1%, 1.5% and 2%. Details and results of the experimental study are provided and discussed.
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Demers, M., and K. W. Neale. "Confinement of reinforced concrete columns with fibre-reinforced composite sheets - an experimental study." Canadian Journal of Civil Engineering 26, no. 2 (April 1, 1999): 226–41. http://dx.doi.org/10.1139/l98-067.
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The wrapping of fibre-reinforced composite sheets around concrete columns is a promising method for structural strengthening and repair. This rehabilitation technique is of practical interest, as the lay-up of the sheets is rather easy; it does not require specialized tools, and the epoxy resins employed cure at ambient temperatures. Here, results of an experimental investigation are reported for 16 round reinforced concrete columns 300 mm in diameter and 1200 mm high. These columns were confined by means of carbon-epoxy sheets and loaded concentrically in axial compression. The effects of various parameters on the structural behaviour of the confined concrete columns are investigated. These parameters included the concrete strength, longitudinal steel reinforcement, steel stirrups, steel corrosion, and concrete damage. The test results show that composite confinement can considerably enhance the structural performance of concrete columns, especially with regard to ductility. The potential to restore the full strength of severely damaged columns is also demonstrated, as retrofitted columns exhibit axial load carrying capacities equal or superior to those of undamaged columns, along with significant increases in ductility. The contribution of the transverse steel reinforcement is seen to be minimal, as long as the stirrup spacing is medium to large. For such cases tests on plain concrete cylinders are sufficient for further investigations of this retrofit method, as the key parameters which really affect strength and ductility are the concrete strength, composite fibre type, and sheet thickness.Key words: fibre composite sheets, confinement, concrete, column repair, rehabilitation, strengthening.
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McKenna, J. K., and M. A. Erki. "Strengthening of reinforced concrete flexural members using externally applied steel plates and fibre composite sheets — a survey." Canadian Journal of Civil Engineering 21, no. 1 (February 1, 1994): 16–24. http://dx.doi.org/10.1139/l94-002.
Full textAbstract:
In Canada, as in many other parts of the world, the deterioration of reinforced and prestressed concrete bridges and parking garage structures has reached alarming proportions. Many of these structures face very expensive rehabilitation work or outright replacement. Although strengthening reinforced concrete structures using externally bonded or bolted steel plates is a technology that is not widely known in North America, a number of structures in Europe, Australia, and South America have been rehabilitated using this method. The weight of the steel plates, which makes them difficult to handle in the field, and their susceptibility to corrosion have led to research into the possibility of replacing steel plates with high strength fibre composite sheets. Fibre reinforced composite sheets are composed of carbon, glass, or aramid fibres, bound by a resin epoxy. In addition to being light in weight, these materials do not corrode. Very recently, a few bridges have been repaired in Europe using carbon fibre and glass fibre reinforced plastic sheets. This paper reviews the case studies and research pertaining to the use of steel plates and fibre composite sheets to strengthen and repair reinforced concrete flexural members. Key words: rehabilitation, strengthening, advanced composite materials, fibre reinforced composites, bonding.