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<p>Plastic concrete, widely used in earth dam cut-off walls for its flexibility, low permeability, and low compressive strength, is defined by ICOLD as a specialized concrete made of cement, clay (bentonite), water, and additives like fibers or polymers. It provides crack resistance and deformability to accommodate ground movements. This study examines the effects of 12&#xa0;mm polypropylene (PP) and 30&#xa0;mm macro bar chip fibers on their mechanical properties. Specifically, it evaluates their effects on fracture energy, toughness, and compressive strength. Laboratory tests were conducted on notched three-point bending specimens with fiber contents of 0.3%, 0.7%, and 1% by volume. The results demonstrated that PP fibers increased fracture energy by up to 133.90%, while macro bar chip fibers achieved a 259.32% enhancement, with the latter exhibiting superior toughness improvement. However, fiber incorporation disrupted the matrix homogeneity, increasing permeability and reduced compressive strength. At 1% fiber content, PP fibers caused a 27.20% strength reduction, compared to a 23.32% decrease for macro bar chip fibers. Despite these trade-offs, the substantial gains in fracture energy and post-crack toughness underscore the potential of fiber-reinforced plastic concrete in applications demanding enhanced energy absorption and crack resistance, such as seismic-resistant cut-off walls or underground containment barriers. This study emphasizes the critical role of fiber type and dosage optimization in balancing strength, ductility, and durability—a necessity for deploying this material in critical infrastructure. These findings provide actionable insights for advancing fiber-reinforced plastic concrete in hydraulic engineering.</p>

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Enhancing mechanical properties of plastic concrete using polypropylene fibers and macro bar chips: an experimental study

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Arian DarvishaliNezhad,
  • Seyed Hosein Ghasemzadeh Mousavinejad,
  • Amin Gholizad,
  • Masoud Saber Bazkiagourabi

摘要

Plastic concrete, widely used in earth dam cut-off walls for its flexibility, low permeability, and low compressive strength, is defined by ICOLD as a specialized concrete made of cement, clay (bentonite), water, and additives like fibers or polymers. It provides crack resistance and deformability to accommodate ground movements. This study examines the effects of 12 mm polypropylene (PP) and 30 mm macro bar chip fibers on their mechanical properties. Specifically, it evaluates their effects on fracture energy, toughness, and compressive strength. Laboratory tests were conducted on notched three-point bending specimens with fiber contents of 0.3%, 0.7%, and 1% by volume. The results demonstrated that PP fibers increased fracture energy by up to 133.90%, while macro bar chip fibers achieved a 259.32% enhancement, with the latter exhibiting superior toughness improvement. However, fiber incorporation disrupted the matrix homogeneity, increasing permeability and reduced compressive strength. At 1% fiber content, PP fibers caused a 27.20% strength reduction, compared to a 23.32% decrease for macro bar chip fibers. Despite these trade-offs, the substantial gains in fracture energy and post-crack toughness underscore the potential of fiber-reinforced plastic concrete in applications demanding enhanced energy absorption and crack resistance, such as seismic-resistant cut-off walls or underground containment barriers. This study emphasizes the critical role of fiber type and dosage optimization in balancing strength, ductility, and durability—a necessity for deploying this material in critical infrastructure. These findings provide actionable insights for advancing fiber-reinforced plastic concrete in hydraulic engineering.