This study investigates the impact of various short fibre types on both the fresh and hardened properties of quaternary blend concrete mixes formulated for sustainable and high-performance textile-reinforced concrete (TRC) applications. A total of twenty-nine concrete mixes were developed using quaternary binder blends composed of Portland cement, fly ash, silica fume, and limestone powder, with the binder replacing 70% of the cement by weight and were prepared both without fibres and with short fibres added either individually, alkali-resistant glass, polyvinyl alcohol, or polypropylene, at a volume fraction of 2%, or in hybrid combinations involving two different fibre types maintaining a total fibre volume of 2%. The incorporation of short fibres resulted in a considerable reduction in workability, up to 55%, with the degree of reduction closely linked to the fibre’s specific surface area (PP > PVA > ARG). Although the overall compressive strength experienced only slight decreases, certain fibre and binder combinations showed more pronounced reductions. Notably, drying shrinkage was substantially decreased in mixes reinforced with ARG fibres, followed by those with PVA and PP, illustrating the influence of fibre stiffness on shrinkage mitigation. Furthermore, hybrid fibre combinations exhibited additional effects on workability, compressive strength, and shrinkage, where increasing the proportion of lower-modulus fibres such as PVA and PP led to higher drying shrinkage and a decline in fresh concrete performance.

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Influence of Single and Hybrid Short Fibres on the Fresh and Hardened Properties of Quaternary Blend Concrete for Sustainable Textile-Reinforced Composites

  • Mohammad Alma’aitah,
  • Bahman Ghiassi

摘要

This study investigates the impact of various short fibre types on both the fresh and hardened properties of quaternary blend concrete mixes formulated for sustainable and high-performance textile-reinforced concrete (TRC) applications. A total of twenty-nine concrete mixes were developed using quaternary binder blends composed of Portland cement, fly ash, silica fume, and limestone powder, with the binder replacing 70% of the cement by weight and were prepared both without fibres and with short fibres added either individually, alkali-resistant glass, polyvinyl alcohol, or polypropylene, at a volume fraction of 2%, or in hybrid combinations involving two different fibre types maintaining a total fibre volume of 2%. The incorporation of short fibres resulted in a considerable reduction in workability, up to 55%, with the degree of reduction closely linked to the fibre’s specific surface area (PP > PVA > ARG). Although the overall compressive strength experienced only slight decreases, certain fibre and binder combinations showed more pronounced reductions. Notably, drying shrinkage was substantially decreased in mixes reinforced with ARG fibres, followed by those with PVA and PP, illustrating the influence of fibre stiffness on shrinkage mitigation. Furthermore, hybrid fibre combinations exhibited additional effects on workability, compressive strength, and shrinkage, where increasing the proportion of lower-modulus fibres such as PVA and PP led to higher drying shrinkage and a decline in fresh concrete performance.