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<p>Composites are primarily utilized for rehabilitating aging structures and as a substitute for steel bars in new constructions. This study investigates the application of composite plates reinforced with Alfa natural fibers for reinforcing concrete beams subjected to bending. Initially, the geometrical and mechanical properties of Alfa stems were assessed. Subsequently, 40 × 50 × 500 40 × 40 × 160 mm beams, reinforced with 40 × 4 × 160 Alfa/Epoxy composite plate, were subjected to bending tests for proof-of-concept validation. Epoxy plates reinforced with various Alfa fiber configurations were bonded to the beams’ lower faces. The flexural strength of the unreinforced control beam flexural strength is 3.82 MPa, whereas the beam with the epoxy plate achieved a bending strength of 14.74 MPa, marking a 386% increase. Beams reinforced with long, waterproofed fibers exhibited a flexural strength of 22.78 MPa (596% increase), outperforming those with untreated fibers, which reached 16.05 MPa (420% increase). Hence, waterproofing significantly enhances flexural strength. The numerical model corroborated the experimental results, showing maximal stress in the same sections as the failed experimental tests. These findings underscore the potential of Alfa fiber composites in improving structural performance and contributing to sustainable construction practices in the Mediterranean region. The results can be integrated into construction projects aiming at sustainable material usage and structural reinforcement, enhancing environmental integration and promoting regional development.</p>

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Valorization of Mediterranean natural Alfa fiber (Stipa tenacissima L.) composites for mortar prism reinforcement: enhancing flexural strength and sustainability

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Sofiene Helaili,
  • Achref Guizani

摘要

Composites are primarily utilized for rehabilitating aging structures and as a substitute for steel bars in new constructions. This study investigates the application of composite plates reinforced with Alfa natural fibers for reinforcing concrete beams subjected to bending. Initially, the geometrical and mechanical properties of Alfa stems were assessed. Subsequently, 40 × 50 × 500 40 × 40 × 160 mm beams, reinforced with 40 × 4 × 160 Alfa/Epoxy composite plate, were subjected to bending tests for proof-of-concept validation. Epoxy plates reinforced with various Alfa fiber configurations were bonded to the beams’ lower faces. The flexural strength of the unreinforced control beam flexural strength is 3.82 MPa, whereas the beam with the epoxy plate achieved a bending strength of 14.74 MPa, marking a 386% increase. Beams reinforced with long, waterproofed fibers exhibited a flexural strength of 22.78 MPa (596% increase), outperforming those with untreated fibers, which reached 16.05 MPa (420% increase). Hence, waterproofing significantly enhances flexural strength. The numerical model corroborated the experimental results, showing maximal stress in the same sections as the failed experimental tests. These findings underscore the potential of Alfa fiber composites in improving structural performance and contributing to sustainable construction practices in the Mediterranean region. The results can be integrated into construction projects aiming at sustainable material usage and structural reinforcement, enhancing environmental integration and promoting regional development.