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<p>Self-compacting concrete (SCC) offers superior fresh and hardened properties, which can be further enhanced with lightweight aggregates and fibers. This study investigates recycled plastic straps (RPS) in lightweight SCC (LWSCC) produced with 100% Ponza aggregate. RPS fibers were added at volume fractions of 0.25–0.75% and aspect ratios of 15–45. While RPS fibers reduced fresh-state flowability and passing ability, all mixtures remained moderately fluid. Hardened properties improved significantly; the mixture containing 0.5% fibers and an aspect ratio of 45 showed a splitting tensile strength and flexural strength that were 21.3% and 11.2% higher, respectively, compared to the control. The maximum compressive strength (an 18.9% increase) occurred at 0.25% fibers and an aspect ratio of 15. RPS fibers notably improved thermal resistance but slightly increased water absorption (1.2–3.5%) and porosity (2.1–4.8%). Despite reduced ultrasonic pulse velocity at 28&#xa0;days, all mixtures maintained good-to-excellent concrete quality. The optimal balance between workability and mechanical performance was achieved at 0.5% fiber content and an aspect ratio of 45, demonstrating the potential of RPS fibers for sustainable LWSCC applications that prioritize thermal resistance and ductility. These findings provide practical guidelines for fiber-reinforced LWSCC design, particularly in structural elements requiring enhanced toughness without compromising self-compactability.</p>

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The feasibility of utilizing recycled plastic straps in sustainable lightweight self-compacting concrete

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Nahla Hilal,
  • Aseel S. Mansi,
  • Meyyada Y. Alabdulhady,
  • Haider A. Abdulhameed,
  • Salih Taner Yildirim

摘要

Self-compacting concrete (SCC) offers superior fresh and hardened properties, which can be further enhanced with lightweight aggregates and fibers. This study investigates recycled plastic straps (RPS) in lightweight SCC (LWSCC) produced with 100% Ponza aggregate. RPS fibers were added at volume fractions of 0.25–0.75% and aspect ratios of 15–45. While RPS fibers reduced fresh-state flowability and passing ability, all mixtures remained moderately fluid. Hardened properties improved significantly; the mixture containing 0.5% fibers and an aspect ratio of 45 showed a splitting tensile strength and flexural strength that were 21.3% and 11.2% higher, respectively, compared to the control. The maximum compressive strength (an 18.9% increase) occurred at 0.25% fibers and an aspect ratio of 15. RPS fibers notably improved thermal resistance but slightly increased water absorption (1.2–3.5%) and porosity (2.1–4.8%). Despite reduced ultrasonic pulse velocity at 28 days, all mixtures maintained good-to-excellent concrete quality. The optimal balance between workability and mechanical performance was achieved at 0.5% fiber content and an aspect ratio of 45, demonstrating the potential of RPS fibers for sustainable LWSCC applications that prioritize thermal resistance and ductility. These findings provide practical guidelines for fiber-reinforced LWSCC design, particularly in structural elements requiring enhanced toughness without compromising self-compactability.