Effect of Fibre Length on the Fracture Energy of UHPFRC

Sovják, Radoslav; Máca, Petr; Imlauf, Tomáš

doi:10.1016/j.proeng.2017.06.188

Cited by 25 publications

(9 citation statements)

References 24 publications

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“…The fracture energy of RPC reinforced with 1.5% SSWs increases with the increasing crack length/depth ratio. The fracture energy GF-N of SSW reinforced RPC calculated on the basis of Equation (11) exhibits higher value than that calculated on the basis of Equation (10). The error between GF-N and GF-P(δ) is more than 15% and even as high as 43%…”

Section: Fracture Energymentioning

confidence: 83%

“…It can be known from the above summary that steel fiber especially hooked-end steel fiber has remarkable reinforcing effect on the fracture performances of concrete [9][10][11][12][13][14][15][16][17][18][19][20][21]. Meanwhile, the fracture toughening effect of micro steel fiber on RPC can be achieved at high volume fraction [13].…”

Section: Introductionmentioning

confidence: 95%

“…Meanwhile, in the research of Kazemi et al [8], most of steel fibers in high strength concrete are ruptured once failure occurred because of the high bond strength between matrix and fibers. Sovjáka et al [10] concluded that fracture energy of super-high performance fiber-reinforced concrete increases as the aspect ratio of steel fiber increases, reaching 32400 J/m 2 when the aspect ratio of steel fibers (0.13 mm diameter and 14 mm length) is 108:1. Güneyisi et al [11] determined the fracture energy of steel fiber reinforced artificial lightweight aggregate concrete according to the recommendation of RILEM 50-FMC Technical Committee.…”

Section: Introductionmentioning

confidence: 99%

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Fracture and self-sensing characteristics of super-fine stainless wire reinforced reactive powder concrete

Dong

Ashour

et al. 2020

Cement and Concrete Composites

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Super-fine stainless wire (SSW) can not only form widely distributed enhancing, toughening and conductive network in reactive powder concrete (RPC) at low dosage level, but also improve weak interface area and refine cracks due to its micron scale diameter and large specific surface. In addition, the crack resistance zone generated by SSWs and RPC matrix together has potential to further enhance the fracture properties of composites. Therefore, fracture and self-sensing characteristics of SSW reinforced RPC composites were investigated in this paper. Experimental results indicated that adding 1.5 vol. % of SSW leads to 183.1% increase in the initial cracking load of RPC specimens under three-point bending load. Based on two parameter fracture model calculations, an increase of 203.4% in fracture toughness as well as an increase of 113.3% in crack tip opening displacement of the composites reinforced with 1.5% SSWs are achieved. According to double-K fracture model calculations, the initiation fracture toughness and unstable fracture toughness of the composites are enhanced by 185.2% and 179.2%, respectively. The increment for fracture energy of the composites reaches up to 1017.1% because of the emergence of blunt and tortuous cracks. The mixed mode Ⅰ-Ⅱ fracture toughness of the composites is increased by 177.1% under four-point shearing load. The initial angle of mixed mode Ⅰ-Ⅱ cracks of the composites decreases with the increase of SSW content. The initiation and propagation of cracks in the composites can be monitored by their change in electrical resistivity. The excellent fracture toughness of the composites is of great significance for the improvement of structure safety in serviceability limit states, and the self-sensing ability of the composites can also provide early warning for the degradation of structure safety.

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Section: Fracture Energymentioning

confidence: 83%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Fracture and self-sensing characteristics of super-fine stainless wire reinforced reactive powder concrete

Dong

Ashour

et al. 2020

Cement and Concrete Composites

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“…The fibers reduced the mass which was ejected and detached from the concrete slabs. Sovjak et al [44,45] studied the effect of the fiber volume fraction and the fiber aspect ratio on the fracture energy. Their research proved that fracture energy increases when aspect ratio and volume fraction of fiber increases.…”

Section: Results From Projectile Impactmentioning

confidence: 99%

Resistance of an Optimized Ultra-High Performance Fiber Reinforced Concrete to Projectile Impact

2021

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The scope of this paper is to investigate the performance of ultra-high performance fiber reinforced concrete (UHPFRC) concrete slabs, under projectile impact. Mixture performance under impact loading was examined using bullets with 7.62 mm diameter and initial velocity 800 m/s. The UHPFRC, used in this study, consists of a combination of steel fibers of two lengths: 6 mm and 13 mm with the same diameter of 0.16 mm. Six composition mixtures were tested, four UHPFRC, one ultra-high performance concrete (UHPC), without steel fibers, and high strength concrete (HSC). Slabs with thicknesses of 15, 30, 50, and 70 mm were produced and subjected to real shotgun fire in the field. Penetration depth, material volume loss, and crater diameter were measured and analyzed. The test results show that the mixture with a combination of 3% 6 mm and 3% of 13 mm length of steel fibers exhibited the best resistance to projectile impact and only the slabs with 15 mm thickness had perforation. Empirical models that predict the depth of penetration were compared with the experimental results. This material can be used as an overlay to buildings or to construct small precast structures.

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“…The results showed that RPC mixtures incorporating short steel fibers exhibited enhanced flexural properties compared to mixtures with a similar volume of longer steel fibers. Sovjak [23,24] found that the effective fracture energy of ultra-high-performance fiber-reinforced concrete was dependent on both the fiber volume fraction and the fiber aspect ratio, and the fracture energy increased as the aspect ratio increased. Xia [25] studied the effects of steel fiber length on the mechanical properties of RPC and found that steel fiber length had a small impact on the compressive strength, but that the fracture energy sharply decreased by about 50% when the steel fiber length was reduced from 12 to 3 mm.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Match Relation between Steel Fiber and High-Strength Concrete Matrix in Reactive Powder Concrete

et al. 2019

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This study investigated the strength and toughness of reactive powder concrete (RPC) made with various steel fiber lengths and concrete strengths. The results indicated that among RPC samples with strength of 150 MPa, RPC reinforced with long steel fibers had the highest compressive strength, peak strength, and toughness. Among the RPC samples with strength of 270 MPa, RPC reinforced with short steel fibers had the highest compressive strength, and peak strength, while RPC reinforced with medium-length steel fibers had the highest toughness. As a result of the higher bond adhesion between fibers and ultra-high-strength RPC matrix, long steel fibers were more effective for the reinforcement of RPC with strength of 150 MPa, while short steel fibers were more effective for the reinforcement of RPC with strength of 270 MPa.

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Effect of Fibre Length on the Fracture Energy of UHPFRC

Cited by 25 publications

References 24 publications

Fracture and self-sensing characteristics of super-fine stainless wire reinforced reactive powder concrete

Fracture and self-sensing characteristics of super-fine stainless wire reinforced reactive powder concrete

Resistance of an Optimized Ultra-High Performance Fiber Reinforced Concrete to Projectile Impact

Investigation of the Match Relation between Steel Fiber and High-Strength Concrete Matrix in Reactive Powder Concrete

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