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<p>Twisted fibers provide a unique mechanical interaction inside the concrete matrix due to specific geometric configurations, which improves the mechanical properties of concrete. This study investigates the effects of different lengths, pitches, and contents of mechanically twisted fibers produced by a semi-automatic machine on the mechanical properties of fiber-reinforced concrete (FRC). Various mechanical properties and production costs were compared for twisted galvanized iron (GI) fiber-reinforced concrete (TGIFRC) and plain GI fiber-reinforced concrete (PGIFRC). The results reveal that adding novel twisted fibers to concrete reduces its workability while improving its mechanical properties, including toughness, ductility, and energy absorption. TGFIRC exhibited an increase of 14–77.5% in compressive strength, 21–83.1% in split tensile strength, and 22.7–92.7% in flexural strength compared to the control specimen for varying fiber lengths along with an increase of 9–12.6% in compressive strength, 2–30.6% in split tensile strength, and 10–29.4% in flexural strength over PGIFRC. TGIFRC has a greater capacity to absorb energy, as evidenced by the toughness indices and residual strengths being significantly higher than those of the control specimen. A cost analysis showed that PGIFRC saves about 16.2% and TGIFRC saves about 4.3% compared to steel FRC. The results of the experiments and cost analysis validate that novel twisted GI fiber (TGIF) can serve as an affordable alternative to steel fibers for enhancing the mechanical properties of concrete. In summary, the findings highlight that twisted GI fibers have the potential to revolutionize cost-effective concrete development by uniting superior mechanical performance with material affordability.</p>

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Effect of a Novel Twisted Fiber Geometry on the Mechanical Properties of Fiber-Reinforced Concrete

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Md. Abir Hasan,
  • Md. Mobashir Hossain,
  • Ahmed Farhan Ahnaf Siddique,
  • Ankon Roy

摘要

Twisted fibers provide a unique mechanical interaction inside the concrete matrix due to specific geometric configurations, which improves the mechanical properties of concrete. This study investigates the effects of different lengths, pitches, and contents of mechanically twisted fibers produced by a semi-automatic machine on the mechanical properties of fiber-reinforced concrete (FRC). Various mechanical properties and production costs were compared for twisted galvanized iron (GI) fiber-reinforced concrete (TGIFRC) and plain GI fiber-reinforced concrete (PGIFRC). The results reveal that adding novel twisted fibers to concrete reduces its workability while improving its mechanical properties, including toughness, ductility, and energy absorption. TGFIRC exhibited an increase of 14–77.5% in compressive strength, 21–83.1% in split tensile strength, and 22.7–92.7% in flexural strength compared to the control specimen for varying fiber lengths along with an increase of 9–12.6% in compressive strength, 2–30.6% in split tensile strength, and 10–29.4% in flexural strength over PGIFRC. TGIFRC has a greater capacity to absorb energy, as evidenced by the toughness indices and residual strengths being significantly higher than those of the control specimen. A cost analysis showed that PGIFRC saves about 16.2% and TGIFRC saves about 4.3% compared to steel FRC. The results of the experiments and cost analysis validate that novel twisted GI fiber (TGIF) can serve as an affordable alternative to steel fibers for enhancing the mechanical properties of concrete. In summary, the findings highlight that twisted GI fibers have the potential to revolutionize cost-effective concrete development by uniting superior mechanical performance with material affordability.