Effect of Fibre Aspect Ratio and Fibre Volume Fraction on the Effective Fracture Energy of Ultra-High-Performance Fibre-Reinforced Concrete

Sovják, Radoslav; Máca, Petr; Imlauf, Tomáš

doi:10.14311/ap.2016.56.0319

Cited by 24 publications

(12 citation statements)

References 32 publications

(44 reference statements)

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“…Plasticizer. In accordance with principles of high performance concrete production [20][21][22], a high amount of super-plasticizer (based on polycarboxylether) was applied to reduce the water to binder ratio to 0.25. This high dosage of plasticizer can cause changes during its burning and evaporation after the first thermal loading cycle.…”

Section: Composition Of Used Mixturesmentioning

confidence: 99%

Cyclic Temperature Loading Residual Flexural Strenght of Refractory Slabs

2017

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Abstract. This paper describes the effect of cyclic elevated temperature loading on refractory slabs made from high performance, fibre reinforced cement composite. Slabs were produced from aluminous cement-based composites, reinforced by different dosages of basalt fibres. The composite investigated in this study had self-compacting characteristics. The slabs used were exposed to different thermal loading -600°C, 1000°C, six times applied 600°C and 1000°C. Then, flexural strength was investigated in all groups of slabs, including group reference slabs with no thermal loading. The results show that the appropriate combination of aluminous cement, natural basalt aggregate, fine filler and basalt fibres in dosage 1.00 % of volume is able to successfully resist to cyclic temperature loading. Tensile strength in bending of these slabs (after cyclic temperature loading at 600°C) achieved 6.0 MPa. It was demonstrated that it is possible to use this composite for high extensive conditions in real industrial conditions.

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Section: Composition Of Used Mixturesmentioning

confidence: 99%

Cyclic Temperature Loading Residual Flexural Strenght of Refractory Slabs

2017

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“…The fibres that were used to construct the UHPFRCC were straight and smooth with a length of 14 mm and aspect ratio of 108:1. It has been demonstrated in previous studies that a higher aspect ratio >100:1 results in a significantly higher flexural strength and also in a higher amount of energy dissipated during the fracture [20]. The number of fibres in the material body, which has been set to 1.5% in this study by volume, was derived from a reasonable trade-off between the performance and workability of the fresh mixture.…”

Section: Ultra-high-performance Fibre-reinforced Cementitious Compositementioning

confidence: 91%

Experimental Investigation of Thin-Walled UHPFRCC Modular Barrier for Blast and Ballistic Protection

et al. 2020

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The static response of ballistic panels and also its resistance to blast and ballistic impact is investigated in the framework of this study. By connecting individual ballistic panels together, the protective barrier can be constructed. The protective barrier can be featured as a system with high mobility and versatility that is achieved by linking basic interlocking plate elements together. The resulting protective barrier can be shaped according to many possible scenarios in a wall with various possible opening angles and a small post with the tetragonal base or a larger post with the hexagonal ground plan. The material solution of the protective barrier benefits from the application of ultra-high-performance fibre-reinforced cement-based composites (UHPFRCC), which meets the requirements for enhanced resistance against extreme loads such as blast or impact. Besides, by using UHPFRCC, thin and slender design can be adopted, which is advantageous in many ways. Slender design results in a lower weight, allowing for easy manipulation and replacement. To verify the behavior of the panels, the proposed barrier was subjected to various loadings at different strain rates. The experimental campaign demonstrated that the protective barrier has a reasonable load-bearing capacity and also sufficient resistance against projectile impact and blast effects.

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“…According to the aspect ratio of fiber, as l/d increase, the toughness index increase. Where Nawy [46], Wang et al [47] and Sovják et al [48] mentioned that toughness is significantly improved as a function of the increasing of the aspect ratios of the fibers used. On the other hand, Homrich and Naaman [49] found that fiber length and aspect ratio affect the possible volume fraction of fibers that may be placed in molds, where a higher aspect ratio is reflected by a higher absolute number of fibers in the mixture which lead to more energy absorption and better crack control.…”

Section: Toughness Of Sifconmentioning

confidence: 99%

Effects of Steel Fibers Geometry on the Mechanical Properties of SIFCON Concrete

2020

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This research aims to shed light on the effect of steel fiber shape, length, diameter, and aspect ratio on the mechanical properties of slurry infiltration fiber reinforced concrete (SIFCON). This study comprised of casting and testing three groups of SIFCON specimens with 6% fiber volume fraction. The first group was reinforced with micro steel fiber, other reinforced by hook end steel fibers, while the last group of specimens reinforced by mixing two shape of steel fiber as hybrid fiber (3% micro steel fiber +3% hook end steel fiber). Silica fume was used as a partial replacement (10%) by weight of cement. 3.7% super plasticizer was used to make the slurry liquid enough to penetrate through the fiber network, while the w/c ratio kept constant at 0.33. It was found from the results achieved that the compressive strength, static modulus of elasticity, splitting tensile strength and toughness are extremely affected by the geometry of fibers because the network of fibers formed and their density depends on the size and shape of fibers. Where the values of micro steel fibers are far outweighing the values of hooked end fibers. It was also deduced from empiricism results that combining long and short fibers gives excellent results.

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Effect of Fibre Aspect Ratio and Fibre Volume Fraction on the Effective Fracture Energy of Ultra-High-Performance Fibre-Reinforced Concrete

Cited by 24 publications

References 32 publications

Cyclic Temperature Loading Residual Flexural Strenght of Refractory Slabs

Cyclic Temperature Loading Residual Flexural Strenght of Refractory Slabs

Experimental Investigation of Thin-Walled UHPFRCC Modular Barrier for Blast and Ballistic Protection

Effects of Steel Fibers Geometry on the Mechanical Properties of SIFCON Concrete

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