Fiber synergy in Hybrid Fiber Reinforced Concrete (HyFRC) in flexure and direct shear

Banthia, Nemkumar; Majdzadeh, Fariborz; Wu, Jie; Bindiganavile, Vivek

doi:10.1016/j.cemconcomp.2013.10.018

Cited by 289 publications

(129 citation statements)

References 16 publications

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“…The reason for the better performance of hybrid fiber-reinforced concrete than one with a single kind of fibers is the favorable interaction between the fibers and the concrete [21,22]. Controlling cracks of assorted sizes and in various zones of the cementitious material is the principal motivation for combining diverse types of fibers [23].…”

Section: Introductionmentioning

confidence: 99%

Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

Smarzewski

Barnat-Hunek

2017

Int J Civ Eng

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early 1990s [1]. UHPC is characterized by a compressive strength above 120 MPa and high durability [2]. At present, some limitations remain regarding the use of standard concrete, such as its low tensile strength and ductility; however, it is possible that ultra-high-performance concrete reinforced with hybrid fibers can overcome these limitations. The main advantages of the UHPC mixture are: low values of water/binder ratio, the elimination of coarse aggregate, namely, the use of only fine aggregate, a limited amount of fine aggregate, and a packing density in which the grains fill the voids [3]. Besides utilizing a water-reducing agent, an addition of silica fume in UHPC mixtures is recommended to improve the workability [1,4] as silica fume has a diameter small enough to fill the interstitial voids between the cement and quartz sand particles. What is more, to reduce labor costs and provide architects and designers greater architectural freedom in structural member shapes and forms, it is advisable to either to reduce or completely eliminate the implementation of steel reinforcement bars. Nonetheless, the drawbacks of UHPC are that, on the whole, it is expensive and cannot substitute standard concrete in the majority of applications [5]. It is due to the composition of its mixtures that make the UHPC microstructure different from ordinary concrete. For UHPC at W/C = 0.20, its capillary pores become discontinuous when only 26% of the cement has been hydrated, instead of 54% for HPC, where W/C = 0.33 [1,6]. The pore size of UHPC basically varies between 2 and 3 nm, and its total porosity is 2.23% [1]. Studies on UHPC have been carried out by several researchers; nevertheless, the information on UHPC materials and structural properties is still rather lacking. A great deal of this research has revealed that a combination of steel-polypropylene fibers in concrete could take advantage of the material properties of both the fibers to Abstract The purpose of this study was to determine the effect of steel/polypropylene hybrid fibers on the mechanical properties and microstructure of ultra-highperformance concrete (UHPC). Tests were carried out on UHPC without and with fibers (steel and/or polypropylene in amounts of 0.25-1%). In this study, granite or granodiorite coarse aggregate with a grain size of about 2/8 mm was employed. The three-point bending tests displayed prolonged post-peak softening behavior. In addition, increasing the content of polypropylene fibers reduced the fracture energy. Moreover, the SEM results illustrated that adding a certain amount of fibers to concrete considerably changes the microstructure. It was observed that the smallest microcracks in the interfacial transition zone between the paste and aggregate occurred in the concrete containing steel fibers.

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Section: Introductionmentioning

confidence: 99%

Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

Smarzewski

Barnat-Hunek

2017

Int J Civ Eng

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“…As commonly known, in most cases, the hybrid fibres reinforced concretes have better mechanical properties than the concretes with only a single type of fibres [36][37][38][39][40][41][42][43][44]. The application of different types of fibres combined in one concrete mixture was firstly proposed by Rossi in 1987 [45], as the so-called multi-modal fibre reinforced concrete (MMFRC).…”

Section: Introductionmentioning

confidence: 99%

Development of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC): Towards an efficient utilization of binders and fibres

Spiesz

Brouwers

2015

Construction and Building Materials

149

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“…This aspect can be improved by fiber inclusion. Cracks may occur in concrete subjected to dynamic loading, and their formation as well as propagation can be controlled by fiber inclusion which subsequently leads to an increase in impact resistance [1][2][3][4][5][6][7][8]. Behaviour of fiber reinforced concrete under impact loads can be investigated by different test methods.…”

Section: Introductionmentioning

confidence: 99%

Dependence of Impact Resistance of Steel Fiber Reinforced Concrete on Aggregate Origin

2015

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In this study, the effect of aggregate origin on impact resistance of steel fiber reinforced concrete was investigated. Using gravel-sized limestone, basalt and natural aggregates of 20 mm of maximum size, normal and steel fiber reinforced concretes were produced. Water/cement ratio and cement dosage of concrete mixtures were 0.5 and 400 kg/m 3 , respectively. It should be noted that superplasticizer and steel fibers were used in concrete production. Hooked-end bundled steel fibers with l/d ratio of 65 and 1.0% fiber volume were used. After 28 days standard curing, compressive strength, split tensile strength and ultrasonic pulse velocity tests were performed on 150 × 150 × 150 mm 3 cube specimens. Additionally, impact resistances of concrete specimens were determined using impact test apparatus described in ACI Committee 544. Φ150 × 300 mm 3 cylinders were prepared for impact resistance tests. After 28 days curing, these specimens were cut into Φ150 × 64 mm 3 dimension. Impact resistance tests were performed on these specimens. Experimental results were evaluated in terms of steel fiber presence and aggregate origin.

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Fiber synergy in Hybrid Fiber Reinforced Concrete (HyFRC) in flexure and direct shear

Cited by 289 publications

References 16 publications

Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

Development of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC): Towards an efficient utilization of binders and fibres

Dependence of Impact Resistance of Steel Fiber Reinforced Concrete on Aggregate Origin

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