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Development of double-helix macro BFRP fibers for concrete reinforcement

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Abstract

Basalt fiber is more cost-effective than carbon fiber and has superior mechanical and chemical properties than glass fiber. Most existing studies considered the use of micro basalt fibers in concrete matrix to reduce shrinkage and control micro cracks. However, macro fibers are often required to reinforce concrete material when large deformation and macro cracks in structural elements are of concern. Very few studies have been reported for macro Basalt Fiber Reinforced Polymer (BFRP) fibers to improve mechanical properties of concrete. The geometric characteristics of macro fibers are critical for concrete reinforcement. It is known that macro fibers with smooth surface possess poor bond strength. To enhance the bonding properties between macro BFRP fibers and concrete, in this experimental study, pullout tests on macro BFRP fibers with various geometric forms from different grades of mortar matrix were carried out. Smooth fiber, etched fiber and double-helix fiber were manufactured and evaluated. The effects of embedded length and matrix strength are also investigated through pullout behavior of single BFRP fiber. The variation of etched intervals of etched fibers on bond strength was also taken into account. It was found that the double-helix fiber outperformed other types of fibers in terms of strength utilization ratio and energy absorption capability. An empirical model for interfacial bond-slip relation was proposed based on the test results. Based on results of pullout tests, the outstanding performance of double-helix BFRP fiber was further verified by examining the mechanical properties of normal-strength concrete specimens reinforced with different types of macro BFRP fibers.

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Acknowledgements

The authors sincerely acknowledge the assistance from Dr Pengfei Zhao from School of Mechanical Engineering, Tianjin University for manufacturing the etched BFRP fibers. The first and third authors are grateful for the financial support from National Natural Science Foundation of China (NSFC) (grant numbers: 51778415, 51938011), Natural Science Foundation of Hebei Province (grant number: E2020402079) and National Key Research and Development Program of China (grant number: 2019YFC1907202).

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Authors and Affiliations

  1. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin, 300350, China

    Chunlei Zhang & Yifei Hao

  2. School of Civil Engineering, Tianjin University, Tianjin, 300384, China

    Chunlei Zhang & Yifei Hao

  3. Centre for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Kent Street, Bentley, WA, 6102, Australia

    Hong Hao

  4. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin, 300401, China

    Yifei Hao

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  1. Chunlei Zhang
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  2. Hong Hao
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Correspondence to Hong Hao or Yifei Hao.

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Zhang, C., Hao, H. & Hao, Y. Development of double-helix macro BFRP fibers for concrete reinforcement. Mater Struct 54, 165 (2021). https://doi.org/10.1617/s11527-021-01762-2

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