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<p>The rapid expansion of urban infrastructure and the growing demand for sustainable construction materials over the past five decades have prompted extensive research into eco-friendly and non-toxic alternatives to conventional building components. In response, the present study investigates the development of an eco-friendly fiber-reinforced plastic (FRP) rebar, utilizing natural fiber extracted from the pod of the <i>Lablab purpureus</i> plant and silicon carbide (SiC) ceramic particles derived from coconut shells, embedded within a vinyl ester matrix. The composite rebars were analyzed for their mechanical, thermal, electrical, and water absorption properties. Among the fabricated samples, composite rebar VFS2 (comprising 40 vol.% fiber and 3 vol.% SiC) demonstrated superior mechanical performance, achieving tensile, flexural, and impact strengths of 79&#xa0;MPa, 98&#xa0;MPa, and 6.6&#xa0;J, respectively. These values represent enhancements of 64.58%, 40%, and 200% over the plain vinyl ester rebar (V), respectively. However, increasing the filler content to 5 vol.% in VFS3 resulted in diminished tensile, flexural, and impact strengths but improved hardness, reaching 82 Shore-D—an increase of 20.58% compared to the control. Thermal and water absorption analyses revealed that the addition of 5 vol.% SiC particles significantly improved the composite's heat transfer capability and hydrophobicity, with a thermal conductivity of 0.42 W/m·K and a remarkably low water absorption rate of 0.0009%. SEM micrographs confirmed enhanced interfacial bonding and surface integrity in fiber and filler-modified specimens, correlating with their improved load-bearing capacity. Overall, the study demonstrates that the proposed bio-based FRP rebar is not only a sustainable and cost-effective alternative to conventional materials but also possesses the requisite strength and durability for high-performance structural applications.</p>

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Mechanical, Thermal, Dielectric and Water Absorption Analysis of Eco-Friendly FRP Rebar for Structural Applications

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • S. Sudhakar,
  • Needhidasan Santhanam,
  • S. Sarojini,
  • S. Rajendran

摘要

The rapid expansion of urban infrastructure and the growing demand for sustainable construction materials over the past five decades have prompted extensive research into eco-friendly and non-toxic alternatives to conventional building components. In response, the present study investigates the development of an eco-friendly fiber-reinforced plastic (FRP) rebar, utilizing natural fiber extracted from the pod of the Lablab purpureus plant and silicon carbide (SiC) ceramic particles derived from coconut shells, embedded within a vinyl ester matrix. The composite rebars were analyzed for their mechanical, thermal, electrical, and water absorption properties. Among the fabricated samples, composite rebar VFS2 (comprising 40 vol.% fiber and 3 vol.% SiC) demonstrated superior mechanical performance, achieving tensile, flexural, and impact strengths of 79 MPa, 98 MPa, and 6.6 J, respectively. These values represent enhancements of 64.58%, 40%, and 200% over the plain vinyl ester rebar (V), respectively. However, increasing the filler content to 5 vol.% in VFS3 resulted in diminished tensile, flexural, and impact strengths but improved hardness, reaching 82 Shore-D—an increase of 20.58% compared to the control. Thermal and water absorption analyses revealed that the addition of 5 vol.% SiC particles significantly improved the composite's heat transfer capability and hydrophobicity, with a thermal conductivity of 0.42 W/m·K and a remarkably low water absorption rate of 0.0009%. SEM micrographs confirmed enhanced interfacial bonding and surface integrity in fiber and filler-modified specimens, correlating with their improved load-bearing capacity. Overall, the study demonstrates that the proposed bio-based FRP rebar is not only a sustainable and cost-effective alternative to conventional materials but also possesses the requisite strength and durability for high-performance structural applications.