Behavior of Nylon Fiber Reinforced Concrete at Elevated Temperature

Document Type : Regular Paper

Authors

1 Department of Civil Engineering, Ahsanullah University of Science and Technology, Bangladesh

2 Professor, Department of Civil Engineering, Ahsanullah University of Science and Technology, Bangladesh

3 Lecturer, Department of Civil Engineering, Ahsanullah University of Science and Technology, Bangladesh

Abstract

Incorporating fibers into reinforced cement concrete significantly enhances the structural suitability under impact and seismic loads by augmenting the stiffness and energy-saving efficiency of the material. Concrete cracks activate the vital fiber behavior called the bridge effect, enhancing the structure's strength and ductility. Since adding fibers to the concrete mix does not reduce water content but rather impairs workability due to the friction generated between fibers and the mixed paste, resulting in fiber balling. This phenomenon diminishes the performance of fiber-reinforced concrete. Adequate distribution and dispersion of fiber in the mix increases the strength and thus avoids the occurrence of fiber balling. According to reviews, nylon fiber dosages ranging from 1.5% to 3% result in effectively performing nylon fiber-reinforced concrete, which exhibits sufficient strength, durability, and flexibility. In this study, experiments have been conducted to better understand the behavior of nylon fiber-reinforced concrete at elevated temperatures by using 17 mm, 25 mm, and 50 mm nylon fiber at 1.5% and 3% dosages. When comparing different temperatures, such as normal temperature condition and elevated temperature conditions (400 °C and 800 °C), always 1.5% dosage has shown the best result for compressive strength and split tensile strength. Here, 3% dosage of nylon fiber has shown reduced mechanical strength because of the effect of fiber balling. As far as compressive strength has taken into account in three temperature cases (normal temperature, 400 °C and 800 °C), 1.5% dosage and 50 mm length of nylon fiber has achieved the most effective strength result. Besides, when split tensile strength has been concerned, 1.5% dosage and 25 mm length of nylon fiber have given the best result compared to other lengths and dosage in three temperature conditions.

Graphical Abstract

Behavior of Nylon Fiber Reinforced Concrete at Elevated Temperature

Highlights

  • Conducted Compressive and split tensile Strength tests of conventional concrete and Nylon fiber-reinforced concrete (NFRC) Cylinders at normal and elevated temperatures (400 ⁰C and 800 ⁰C) varying the length of nylon fiber 17, 25, and 50 mm.
  • Optimal Performance at 1.5% Dosage: A 1.5% nylon fiber dosage consistently provides the best compressive and split tensile strength across normal and elevated temperatures (400 °C and 800 °C).
  • Effective Fiber Lengths: For compressive strength, 50 mm nylon fibers at 1.5% dosage are most effective, while for split tensile strength, 25 mm fibers at the same dosage perform best.
  • Challenges with Higher Dosage: A 3% nylon fiber dosage reduces mechanical strength due to fiber balling.

Keywords

Main Subjects

References

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History

  • Receive Date: 09 January 2024
  • Revise Date: 09 November 2024
  • Accept Date: 15 January 2025

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