The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Stephen J Foster - One of the best experts on this subject based on the ideXlab platform.
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shear strength of Steel Fibre reinforced concrete beams with stirrups
Engineering Structures, 2016Co-Authors: Ali Amin, Stephen J FosterAbstract:Abstract Despite the increased awareness of Steel Fibre Reinforced Concrete (SFRC) in practice and research, SFRC is yet to find common application in load bearing or shear critical building structural elements. Although the far majority of studies on SFRC have focused on members containing Fibres only, in most practical applications of SFRC construction, structural members made of SFRC are also reinforced with conventional reinforcing Steel for shear ligatures. In this paper, results are presented on shear tests which have been conducted on ten 5 m long by 0.3 m wide by 0.7 m high rectangular simply supported beams with varying transverse and Steel Fibre reinforcement ratios. The tests have been analysed along with complete material characterisation which quantify the post-cracking behaviour of the SFRC. A procedure based on the model proposed by Foster (2010) is presented alongside predictions from the fib Model Code 2010 (Final Draft, 2012) and Draft Australian Bridge Code: Concrete (DR AS5100.5, 2014) and is shown to correlate well with the test data.
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the behaviour of Steel Fibre reinforced geopolymer concrete beams in shear
Magazine of Concrete Research, 2013Co-Authors: Tian Sing Ng, Ali Amin, Stephen J FosterAbstract:An investigation of the shear behaviour of Steel-Fibre-reinforced geopolymer concrete beams is presented. Shear tests were conducted on five series of 250 mm deep by 120 mm wide beams spanning 2250 mm. The beams did not contain conventional web reinforcement (stirrups), but were reinforced with end-hooked and straight Steel Fibres in various Fibre volumetric dosages, ranging from 0 to 1·5%. The test results show that the shear strength increases significantly as the Fibre content increases and that improvement in the cracking behaviour is achieved through the addition of Fibres. The results of the test were compared with the fib Model Code 2010 alternative model for shear strength of Steel-Fibre-reinforced concrete in combination with the variable engagement model for the determination of the tensile strength of Steel-Fibre-reinforced concrete. A good correlation is observed for the predictive model with the test data.
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punching shear strength of Steel Fibre reinforced concrete slabs
Engineering Structures, 2012Co-Authors: L F Maya, Fernandez M Ruiz, Aurelio Muttoni, Stephen J FosterAbstract:The ultimate strength of reinforced concrete slabs is frequently governed by the punching shear capacity, which may be increased with addition of traditional fitments such as reinforcing Steel, headed studs or shear heads. In addition to these traditional methods of strengthening against punching, Steel Fibre reinforcement has proved to be an effective and viable alternative. The addition of Fibres into the concrete improves not only the shear behaviour but also the deformation capacity of reinforced concrete slabs. This paper presents a mechanical model for predicting the punching strength and behaviour of concrete slabs reinforced with Steel Fibres as well as conventional reinforcement. The proposed model is validated against a wide number of available experimental data and its accuracy is verified. On this basis, a simple design equation for the punching shear capacity of Steel Fibre reinforced concrete (SFRC) slabs is proposed.
Adel A Alazzawi - One of the best experts on this subject based on the ideXlab platform.
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tension stiffening evaluation of Steel Fibre concrete beams with smooth and deformed reinforcement
Journal of King Saud University: Engineering Sciences, 2020Co-Authors: Raid A Daud, Sultan A Daud, Adel A AlazzawiAbstract:Abstract This study investigated the flexural performance of Steel Fibre beams reinforced with smooth and deformed reinforcement, both experimentally and numerically. As part of the experimental investigation, five full-scale reinforced concrete beams were constructed with plain and Steel Fibre concrete and were tested under 4-point flexural monotonic loading. The amount of Fibre and the condition of the rebar were the main parameters studied. The test’s outcome built up a numerical model to simulate the actual performance of the reinforced concrete beams under tested loading. Afterward, a parametric study was conducted to get a better understanding of the behaviour of the Steel Fibre concrete beams. The experimental results show that the cracking load was not affected by the Steel reinforcement conditions, whether smooth or deformed. Moreover, 9% of the ultimate deflection was caused by tension stiffening and 3% due to the Steel Fibre content in Steel Fibre concrete beams. Finally, the concrete compressive strength was found to have less of an effect on the ultimate deflection than the ultimate load.
Okan Karahan - One of the best experts on this subject based on the ideXlab platform.
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a comparative experimental investigation of concrete reinforced concrete and Steel Fibre concrete pipes under three edge bearing test
Construction and Building Materials, 2007Co-Authors: Tefaruk Haktanir, Fatih Altun, Okan KarahanAbstract:Three-edge-bearing and crack size measurement tests were carried out on plain concrete, reinforced-concrete, and Steel-Fibre concrete pipes of 500 mm diameters. The average three-edge-bearing strength and crack size of Steel-Fibre concrete pipes having Steel Fibres of RC80/60-BN type at a dosage of 25 kg/m3 turned out to be 82% greater and 47% smaller than those of plain concrete pipes, and 6% greater and 15% smaller than those of reinforced-concrete pipes, respectively. Tests on those Steel-Fibre concrete pipes having a Steel Fibres dosage of 40 kg/m3 revealed that a Steel Fibres dosage of 25 kg/m3 seems to be close to optimum because a 60% increase in the amount of Steel Fibres engenders only minor improvements. By these findings, Steel-Fibre concrete pipes are more economical than and mechanically and physically superior to reinforced-concrete pipes. (A) Reprinted with permission from Elsevier.
Hazizan Md Akil - One of the best experts on this subject based on the ideXlab platform.
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Fracture characteristics of plain and Steel Fibre reinforced rubberized concrete
Construction and Building Materials, 2017Co-Authors: Ahmed Tareq Noaman, B.h. Abu Bakar, Hazizan Md Akil, Aktham H. AlaniAbstract:Abstract This study investigates the effect of recycled crumb rubber aggregates on the fracture characteristics of both plain concrete (PC) and Steel Fibre concrete (SFC) as a potential solution of the problem of discarded tires and due to the capacity of rubber aggregates to absorb high fracture energy. The variables considered in the experimental work are the concrete type (i.e., plain and Steel Fibre concrete) and the crumb rubber aggregate content as replacement ratios (i.e., 5%, 10%, 15%, 20%, and 25%) by volume of sand. The Steel Fibre used is a hooked-end Fibre with an aspect ratio of 80 and a diameter of 0.75 mm with a constant volume of 0.5%. The mechanical properties, fracture energy, stress intensity factor, critical strain energy release rate, elasticplastic fracture toughness parameter, and characteristic length of plain and Steel Fibre reinforced rubberized concrete are considered herein. Results show enhanced fracture characteristics induced by the crumb rubber inclusion in plain concrete. Further enhancement was observed by combination of Steel Fibre and crumb rubber aggregate in concrete. In addition to promote healthy environment using recycling waste tires.
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experimental investigation on compression toughness of rubberized Steel Fibre concrete
Construction and Building Materials, 2016Co-Authors: Ahmed Tareq Noaman, B Abu H Bakar, Hazizan Md AkilAbstract:Abstract In this study, the compression toughness of Steel Fibre concrete (SFC) with the inclusion of crumb rubber by partial replacement of fine aggregate was investigated. Crumb rubber was incorporated at different percentages of 5%, 10%, and 15% by volume. The compression properties (compression strength, modulus of elasticity and stress–strain diagrams) showed a possible interaction between Steel Fibre and crumb rubber to enhance such properties of concrete. Results obtained showed improvement in the compression toughness by increase of crumb rubber content up to 15% and change into the behaviour of normal concrete to ductile instead of brittle. The toughness index and the specific compression toughness of concrete specimens indicated crumb rubber could be satisfactorily utilized with Steel Fibre to present a good performance under compressive loading and to keep the environment clean and healthy by recycling of waste tire.
Byung-tak Hong - One of the best experts on this subject based on the ideXlab platform.
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bonding properties of amorphous micro Steel Fibre reinforced cementitious composites
Composite Structures, 2013Co-Authors: Byung-tak Hong, Se Jin ChoiAbstract:Abstract This study evaluated the bonding properties between thin amorphous micro-Steel Fibres and cement composite materials. Bonding properties were determined using the pull-out test according to JCI SF-8. The type and number of Fibres, along with the strength of the cement matrix, were selected as test variables. Using the bond strength test, the performance of amorphous micro-Steel Fibre and hooked-type Steel Fibre was compared. The bond strength test results with mortar showed that the maximum pull-out load of amorphous micro-Steel Fibre was larger than that of hooked-type Steel Fibre. These results were attributable to the higher tensile strength of the amorphous micro-Steel Fibre. However, the interfacial toughness and bond strength were greater in hooked-type Steel Fibre due to the Fibre shape and surface texture. Additionally, the high-strength mortar exhibited enhanced bonding behaviour compared with typical mortar, regardless of Fibre type, suggesting that the interface between the Fibre and the matrix was strengthened as the matrix strength increased.
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Flexural behaviour of amorphous micro-Steel Fibre-reinforced cement composites
Composite Structures, 2012Co-Authors: Byung-tak Hong, Tei-joon Choi, Joo-won KangAbstract:Abstract In this study, the flexural behaviour of thin micro-Steel Fibre of low specific gravity was evaluated. Micro-Steel Fibre has higher strength, toughness, and elasticity than conventional Steel Fibre. Flexural tests were carried out using 0.2%, 0.3%, 0.4%, 0.5%, 0.7%, and 1% Fibre volume fractions ( V f ). The flexural strength and flexural toughness of micro-Steel Fibre-reinforced cement composites were superior to those of Steel Fibre-reinforced cement composites. Flexural strength increased by 20%, 37%, 33%, 41%, 47%, and 48% in micro-Steel Fibre-reinforced cement composites with 0.2%, 0.3%, 0.4%, 0.5%, 0.7%, and 1% V f , respectively, compared with Steel Fibre-reinforced cement composites of the same V f . The 0.2% and 0.3% volume fractions did not significantly affect flexural toughness. However, flexural toughness increased by 39%, 56%, 44%, and 36% in amorphous Steel Fibre-reinforced cement composites with 0.4%, 0.5%, 0.7%, and 1.0% V f , respectively, compared with Steel Fibre-reinforced cement composites of the same V f .
