Effects of steel fibres on dynamic strength of UHPC

Su, Yu; Li, Jun; Wu, Chengqing; Wu, Pengtao; Li, Zhongxian

doi:10.1016/j.conbuildmat.2016.04.007

Cited by 204 publications

(43 citation statements)

References 13 publications

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“…It can be seen with the increase of fibre length or aspect ratio, compressive strength increases slightly from 132.6 to 138.2 MPa, while there is no such trend for peak strain. A similar trend was also found by Su et al [35].…”

Section: Compressive Strengthsupporting

confidence: 90%

Meso-scale modelling of steel fibre reinforced concrete with high strength

Liang

2018

Construction and Building Materials

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Based on Delaunay triangulation, a 3D meso-scale model is successfully developed and verified. This approach modelling fibre and concrete separately and linking them with slide line contact has the capability to truly reflect the interfacial behaviour of fibre and mortar, and thus achieve high fidelity of numerical simulations. However, meso-scale modelling usually means tremendous complexity and long computational time. This paper proposes a model to achieve relatively high computation efficiency, as well as accuracy. Besides, the model has the potential to deal with small specimens cut from steel fibre reinforced concrete (SFRC) blocks.

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Section: Compressive Strengthsupporting

confidence: 90%

Meso-scale modelling of steel fibre reinforced concrete with high strength

Liang

2018

Construction and Building Materials

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“…Also, a matrix without fiber reinforcement generally has a higher DIF than a matrix with fiber reinforcement (Millard et al 2010). Su et al (2016) investigated the effect of various fiber types on dynamic compressive strength of UHPC. Four types of fibers were considered, 0.12-mm-(0.0047-in.-) diameter microfibers with lengths of 6 mm and 15 mm (0.24 in.…”

Section: Dynamic Compressive Behavior Of Uhpcmentioning

confidence: 99%

Effect of fiber orientation on dynamic compressive properties of an ultra-high performance concrete

Groeneveld¹,

Ahlborn²,

Crane³

et al. 2017

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Casting structural elements with ultra-high performance concrete (UHPC) tends to create preferential fiber alignment, which affects the strength and must be accounted for in design. To date, most work on fiber-orientation effects has been in tension rather than compression. This work characterizes the fiber orientation occurring in a typical UHPC beam and how that orientation affects compressive behavior at high strain rates. Specimens (36 total) were cored from the beam, and their fiber orientations were non-destructively evaluated using x-ray computed tomography. Fibers showed flow-induced alignment along the length of the beam. The perpendicular orientation number was used to describe orientation, as fibers perpendicular to the load were most effective in crack bridging. Quasi-static compressive strength appeared to increase with perpendicular orientation number, but the correlation is uncertain due to data limitations. Dynamic tests at strain rates of 130 to 200 s-1 were performed with a split-Hopkinson pressure bar. Dynamic compressive strength was independent of orientation number in these tests, although results suggested that the distribution and orientation of fibers influenced crack formation. The strain at peak stress, a measure of ductility, increased up to 25 percent over the range of perpendicular orientation numbers tested. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.

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“…According to Mehta and Monteiro [9], increasing the amount of steel fibers in concrete using contents less than 2% of volume exerts minimal influence on the compressive strength. However, for high strength concretes, an increase in compressive strength was verified for a concentration of 0.5% microfibers [14]. A study by Su et al [14] used a maximum of 2.5% of two types of steel microfibers, with form factors of 50 (6×0.12 mm) and 125 (15×0.12 mm), and achieved compressive strengths of 114 MPa and 145 MPa, respectively.…”

Section: Compressive Strength (F C ) and Modulus Of Elasticity (E C )mentioning

confidence: 99%

“…However, for high strength concretes, an increase in compressive strength was verified for a concentration of 0.5% microfibers [14]. A study by Su et al [14] used a maximum of 2.5% of two types of steel microfibers, with form factors of 50 (6×0.12 mm) and 125 (15×0.12 mm), and achieved compressive strengths of 114 MPa and 145 MPa, respectively. In this work, the form factor of the microfibers was 65 (13×0.2 mm), and a lower concentration of fibers was used.…”

Section: Compressive Strength (F C ) and Modulus Of Elasticity (E C )mentioning

confidence: 99%

Experimental analysis of load capacity in beams with steel fiber reinforcement on the compression face

Deghenhard¹,

Silva

Pelisser

2019

Rev. IBRACON Estrut. Mater.

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The use of steel fibers in the concrete is mainly aimed at increasing the post-peak toughness, due to the adhesion of the fibers to the cementitious matrix. However, there are several typologies of steel fibers, and the main differences are in the form (relation between length and diameter), fiber geometry, and the characterization between macrofibers and microfibers, which generally serve to reduce macrocracking and microcracking, respectively. In this context, this work evaluated the use of microfibers (20 kg/m³ or volume equal to 0.26% (Vf) of concrete volume), macrofibers (20 kg/m³ or Vf = 0.26%) and hybridization (10 kg/m³) + macrofibers (10 kg/m³) inserted in a high strength concrete (fc = 80 MPa). Two types of steel fibers were used: macrofibers with a diameter of 0.75 mm and a length of 60 mm (a form factor of 80); and microfibers with a diameter of 200 μm and a length of 13 mm (a form factor of 65). The fibers were used in concrete to act as a reinforcement on the compression face of reinforced beams (12×20×160cm), and the mechanical characteristics of the concretes were analyzed: (i) flexural strength in prismatic specimens (10×10×35 cm), (ii) compressive strength in cylindrical specimens (20×Ø10 cm) and (iii) modulus of elasticity in cylindrical specimens (20×Ø10 cm). Analysis of the results showed that compressive strength increased by approximately 8% for all the compositions with fibers compared with concrete without fibers. Similar behavior was verified for the modulus of elasticity. In the prismatic specimens (10×10×35 cm) an increase in toughness was observed, with the macrofibers performing better. In beams measuring 12×20×160 cm, an increase in bearing capacity was verified regarding cracking time and plastic rotation, with the best result also obtained using macrofibers. Overall, it can be concluded that the application of reinforcement with steel fibers in the compression face of beams was efficient, even though it did not present a significant increase in compressive strength, a fact that could be correlated with the reduced volume of fibers used.

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Effects of steel fibres on dynamic strength of UHPC

Cited by 204 publications

References 13 publications

Meso-scale modelling of steel fibre reinforced concrete with high strength

Meso-scale modelling of steel fibre reinforced concrete with high strength

Effect of fiber orientation on dynamic compressive properties of an ultra-high performance concrete

Experimental analysis of load capacity in beams with steel fiber reinforcement on the compression face

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