Advances in concrete construction

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Experimental investigation of the pullout behavior of fiber concrete with inclination steel fibers

  • Seyyed Amir Hossein, Madani (Department of Civil Engineering, Arak Branch, Islamic Azad University) ;
  • S. Mohammad, Mirhosseini (Department of Civil Engineering, Arak Branch, Islamic Azad University) ;
  • Ehsanolah, Zeighami (Department of Civil Engineering, Arak Branch, Islamic Azad University) ;
  • Alireza, NezamAbadi (Department of Mechanical Engineering, Arak Branch, Islamic Azad University)
  • Received : 2020.01.30
  • Accepted : 2022.11.18
  • Published : 2022.11.25
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Abstract

Cement-based matrixes have low tensile strength and negligible ductility. Adding fibres to these matrixes will improve their mechanical properties and make these composites suitable for structural applications. Post-cracking tensile strength of steel fibers-reinforced cementitious composite materials is directly related to the number of transverse fibers passing through the crack width and the pulling-out behavior of each of the fibers. Therefore, the exact recognition of the pullout behavior of single fibers is necessary to understand the uniaxial tensile and bending behavior of steel fiber-reinforced concrete. In this paper, an experimental study has been carried out on the pullout behavior of 3D (steel fibers with totally two hooks at both ends), 4D (steel fibers with a total of four hooks at both ends), and 5D (steel fibers with totally six hooks at both ends) in which the fibers have been located either perpendicular to the crack width or in an inclined manner. The pullout behavior of the mentioned steel fibers at an inclination angle of 0, 15, 30, 45, and 60 degrees and with embedded lengths of 10, 15, 20, 25, and 30 millimetres is studied in order to explore the simultaneous effect of the inclination angle of the fibers relative to the alongside loading and the embedded length of fibers on the pullout response in each case, including the maximal pullout force, the slip of the maximum point of pullout force, pullout energy, fiber rupture, and concrete matrix spalling. The results showed that the maximum pullout energy in 3D, 4D, and 5D steel fibers with different embedded lengths occurs at 0 to 30° inclination angles. In 5D fibers, maximum pullout energy occurs at a 30° angle with a 25 mm embedded length.

Keywords

References

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