<p>Concrete has high compressive strength but in its form is inherently brittle and has low tensile/impact resistance and therefore can only perform under stressful structural comprising. Hybrid fibre-reinforced concrete (HFRC) a composite of fibres of various types and geometries has been proposed as a viable solution to these constraints in allowing multi scale crack management and downstream energy capture. In this paper, experimental and analytical literature studies are critically reviewed on the effect of hybrid fibre systems when applied to the mechanical and impact performance of concrete. The review suggests that the compressive strength of the optimum hybrid mixes increases in the range of 5–15 percent, tensile and flexural strengths enhance in the realms of 15–40 and 20–50 percent respectively, as compared to plain concrete. Besides, fibre volume fractions between 0.5 and 2.0 percent are always indicated as effective, but above that dosage levels tend to result in trade-offs in workability. The composite interaction between steel, synthetic, glass and natural fibre improve the crack resistance, ductility and impact toughness as compared to one-fibre systems. The paper has emphasized the relevance of application-based hybridization tools and the crucial research gaps that up-to-date studies would fill in information about optimum fibre ratios, constructability, and long-term service, which would lead to the appropriate process of practical implementation of HFRC in developed structural services.</p>

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Reinforcing resilience: a review of hybrid fibre effects on concrete’s mechanical and impact characteristics

  • Pramod Dabhade,
  • Swati Ambadkar

摘要

Concrete has high compressive strength but in its form is inherently brittle and has low tensile/impact resistance and therefore can only perform under stressful structural comprising. Hybrid fibre-reinforced concrete (HFRC) a composite of fibres of various types and geometries has been proposed as a viable solution to these constraints in allowing multi scale crack management and downstream energy capture. In this paper, experimental and analytical literature studies are critically reviewed on the effect of hybrid fibre systems when applied to the mechanical and impact performance of concrete. The review suggests that the compressive strength of the optimum hybrid mixes increases in the range of 5–15 percent, tensile and flexural strengths enhance in the realms of 15–40 and 20–50 percent respectively, as compared to plain concrete. Besides, fibre volume fractions between 0.5 and 2.0 percent are always indicated as effective, but above that dosage levels tend to result in trade-offs in workability. The composite interaction between steel, synthetic, glass and natural fibre improve the crack resistance, ductility and impact toughness as compared to one-fibre systems. The paper has emphasized the relevance of application-based hybridization tools and the crucial research gaps that up-to-date studies would fill in information about optimum fibre ratios, constructability, and long-term service, which would lead to the appropriate process of practical implementation of HFRC in developed structural services.