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<p>The mechanical properties of concrete reinforced with recycled fibers have been evaluated in numerous studies aimed at managing plastic waste. However, a significant gap remains in the structural analysis of such materials. Additionally, FRP stirrups used for shear reinforcement are pre-fabricated during production and cannot be modified during construction. This research, therefore, aims to assess the feasibility of using recycled plastic strap fibers as an alternative to FRP stirrups and to address the lack of structural evaluation for recycled fibers combined with FRP bars in existing literature. In the experimental phase, eight simply supported BFRP-reinforced concrete beams were tested, including one control beam. The remaining beams were divided into four groups: the first three groups were reinforced with recycled fibers at volume fractions of 0.4%, 0.8%, and 1.2%. Each of these groups contained two beams using different fiber aspect ratios of approximately 28.6 and 14.3. The final group featured a beam with 0.8% fiber and a blended aspect ratio. Test results indicated that the increase in shear strength for BFRP beams reinforced with recycled strap fibers was limited, with longer fibers providing more effective than shorter ones. Optimized and conservative equations for predicting the shear strength of the tested beams are proposed, based on a comprehensive database of approximately 50 data points with various fibers from the literature. The optimized equation provides accurate shear strength predictions, while the conservative equation offers safer results for design purposes, with a safety factor close to 50%.</p>

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Shear strength and behavior of recycled plastic strap fiber reinforced concrete beams with basalt fiber reinforced polymer bars: an experimental and analytical study

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Bedar Rauf Hassan,
  • Arturo Tena-Colunga,
  • Nasih Habeeb Askandar,
  • Naida Ademovic,
  • Lazyar Azad Hatim,
  • Shatw Saadun Mahmood,
  • Amjad Burhan Hussein,
  • Przha Habib Abdulrahman,
  • Lava Mahdi Mohammed

摘要

The mechanical properties of concrete reinforced with recycled fibers have been evaluated in numerous studies aimed at managing plastic waste. However, a significant gap remains in the structural analysis of such materials. Additionally, FRP stirrups used for shear reinforcement are pre-fabricated during production and cannot be modified during construction. This research, therefore, aims to assess the feasibility of using recycled plastic strap fibers as an alternative to FRP stirrups and to address the lack of structural evaluation for recycled fibers combined with FRP bars in existing literature. In the experimental phase, eight simply supported BFRP-reinforced concrete beams were tested, including one control beam. The remaining beams were divided into four groups: the first three groups were reinforced with recycled fibers at volume fractions of 0.4%, 0.8%, and 1.2%. Each of these groups contained two beams using different fiber aspect ratios of approximately 28.6 and 14.3. The final group featured a beam with 0.8% fiber and a blended aspect ratio. Test results indicated that the increase in shear strength for BFRP beams reinforced with recycled strap fibers was limited, with longer fibers providing more effective than shorter ones. Optimized and conservative equations for predicting the shear strength of the tested beams are proposed, based on a comprehensive database of approximately 50 data points with various fibers from the literature. The optimized equation provides accurate shear strength predictions, while the conservative equation offers safer results for design purposes, with a safety factor close to 50%.