Analysis of steel fibers pull-out. Experimental study

Isla, Facundo; Ruano, Gonzalo; Luccioni, Bibiana

doi:10.1016/j.conbuildmat.2015.09.034

Cited by 85 publications

(28 citation statements)

References 16 publications

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“…These differences can be attributed to the remaining irregularities at the fibre end that, together with the presence of coarse aggregates in concrete, increase the residual pull-out strength. Similar behaviour is also reported by other researchers [23,24]. Fig.…”

Section: Effect Of Matrix Strength On Pull-out Behavioursupporting

confidence: 91%

Anchorage mechanisms of novel geometrical hooked-end steel fibres

Abdallah

Fan

2017

Mater Struct

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This study is aimed at fully understanding the anchorage mechanisms of steel fibres with novel hook geometries, e.g. 4DH and 5DH fibres, which were subjected to pull-out loading. The fibres were also embedded in four different matrixes with a compressive strength ranging from 33 to 148 MPa. The results showed that the anchorage and pull out behaviour was not only dependent on the geometry of the hooked end of steel fibres, but also closely related to the characteristics of matrix. Both maximum pullout load and total pull-out work of 5DH fibre were considerably higher than those of 4DH and the controlled 3DH fibres for all matrixes. All fibres embedded in normal strength concrete and medium strength concrete matrixes were completely pulled out without the occurrence of full deformation and straightening of the hook, while the controlled 3DH and 4DH fibres ruptured at hook portion when embedded in ultra-high performance mortar matrix. To fully utilize the high mechanical anchorage, 5DH fibres should be used for reinforcing high or ultra-high performance matrixes in practice.

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Section: Effect Of Matrix Strength On Pull-out Behavioursupporting

confidence: 91%

Anchorage mechanisms of novel geometrical hooked-end steel fibres

Abdallah

Fan

2017

Mater Struct

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“…Yüksek çekme dayanımı ve gelişmiş lif uç geometrisine sahip 4D ve 5D türü liflerin, artan kanca sayısı nedeniyle matrise mekanik ankrajının artması, mukavemetinin yüksek olması nedeniyle kancanın plastik deformasyonun daha yüksek gerilme seviyelerinde gerçekleşmesi ve ayrıca Isla vd. [44] tarafından belirtildiği gibi kancanın plastik deformasyonunu takiben kanca kıvrım bölgelerinin tam olarak düzelmemesi nedeniyle ilave sürtünme kuvvetlerinin oluşması yüksek eğilme performansının başlıca nedenlerindendir.…”

Section: Taze Hal Deney Sonuçları (Fresh State Test Results)unclassified

Çelik lif kanca geometrisinin yüksek dayanımlı lifli betonların statik ve darbe yükleri altında eğilme özelliklerine etkisi

Kızılırmak¹,

Aydın²,

Yardımcı³

2019

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Highlights:Graphical/Tabular Abstract  Effect of the different hook geometries on the flexural behaviour of high strength concrete  Static and impact loading flexural strength of steel fibre reinforced concrete  Dynamic increase factor of steel fibre reinforced concreteIn recent years, steel fibre producers have proposed new generation steel fibres with high strength and multiple hooked-end geometry (4D and 5D) to the construction market. In this study, the effects of the dosage and the aspect ratio of 4D and 5D fibres on the flexural strength and fracture energy of high strength concrete under static and impact flexural loading conditions have been investigated comparatively with the conventional singlehook-end 3D fibres. Figure A. Typical load-deflection curves for concrete with 5D 65/60 steel fibre under static and impact loading conditions Figure B. Flexural strength DIF values Purpose: To compare the effects of hook-end geometry of fibres on the flexural strength and fracture energy of steel fibre reinforced high strength concrete under static and impact flexural loading conditions.Theory and Methods: Notched-prismatic samples (100×100×600 mm) were used in determining the flexural strength and fracture energy of fibre-reinforced high strength concrete under quasi-static and low-velocity impact loading conditions. Quasi-static flexural tests were performed by using a closed loop deflection-controlled testing machine. Low-velocity impact loading on simply supported notched beams was provided by an instrumented drop-weight test machine allowing the free-fall of a hammer from 2 m height onto the mid-span of the beams. The flexural load-deflection curves of the beams under impact loads were obtained by using a data acquisition system that simultaneously collecting the reaction forces with two piezoelectric load cells attached to the supports and the mid-span deflection of the beam with a noncontact laser displacement sensor. Results:The flexural strength and the fracture energy of fibre reinforced high strength concrete significantly improved with the increase in the fibre volume and using multiple hooks-end steel fibres with sufficiently high tensile strength. As compared to static loading, 1.4 to 2.6 times higher flexural strength and 1.2 to 3.0 times higher fracture energy values were obtained under impact loading. The best performance under flexural impact loading has been obtained from steel fibre reinforced high strength concretes with 5D fibres having aspect ratio of 65 and 4D fibres having aspect ratio of 80. Conclusion:The new generation steel fibres with high strength and multiple hooked-end geometry (4D and 5D) have a significant positive effect on flexural behaviour of fibre reinforced concrete under static and impact loads.On the other hand, increasing the fibre aspect ratio and the number of fibre hook ends without increasing the tensile strength of the fibre does not contribute significantly to the mechanical properties of high strength fibre concrete. Similar flexural behaviour with single-hook...

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“…Although there is a gap in literature on fiber-to-mortar bond response in TRM composites (made of lime-based mortars), several information can be found regarding this mechanism in textile reinforced concrete (TRC), where cementitious mortars are utilized [14]. The available results show that the mechanical properties of the textile and the mortar, the chemical interaction between them [14][15][16][17][18] as well as the fiber embedded length [19,20] and orientation with respect to the crack surface [21][22][23] are among the main parameters that can affect the fiber-to-mortar bond response. A variety of pull-out test setups have been used in literature for the characterization of the fiber-to-mortar (or concrete) bond behavior.…”

Section: Introductionmentioning

confidence: 99%

Effect of test setup on the fiber-to-mortar pull-out response in TRM composites: Experimental and analytical modeling

Dalalbashi

Ghiassi

Oliveira

et al. 2018

Composites Part B: Engineering

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Textile-reinforced mortars (TRM) have recently received significant attention for the externally bonded reinforcement (EBR) of masonry and historical structures. The fiber-tomortar bond, the TRM-to-masonry bond, and the mechanical properties of the TRM constituents have a fundamental role in the performance of this strengthening technique and therefore require special attention. Despite this importance, only few investigations are devoted to characterization of the single fiber-to-mortar bond response in these systems. This paper, as an step towards addressing the fiber-to-mortar bond, presents a combined experimental and analytical investigation on the effect of test setup on the pull-out response and bond-slip laws in TRM composites. Three different pull-out test setups, consisting of one pull-pull and two pull-push configurations, are developed and investigated for characterization of the single fiber-to-mortar bond behavior. The experimental and analytical results are critically discussed and presented and bond-slip laws are extracted for each test setup.

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Analysis of steel fibers pull-out. Experimental study

Cited by 85 publications

References 16 publications

Anchorage mechanisms of novel geometrical hooked-end steel fibres

Anchorage mechanisms of novel geometrical hooked-end steel fibres

Çelik lif kanca geometrisinin yüksek dayanımlı lifli betonların statik ve darbe yükleri altında eğilme özelliklerine etkisi

Effect of test setup on the fiber-to-mortar pull-out response in TRM composites: Experimental and analytical modeling

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