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<p>This study investigates the effects of recycled fibers and nano silica (NS) on the mechanical properties and durability of concrete for rigid pavement applications. Waste tire steel fibers (WTSF) and nylon fibers from scrap paintbrushes (NFSB) were incorporated into concrete mixes to enhance flexural, compressive, and tensile strengths, as well as durability under various environmental conditions. The experimental findings indicated notable enhancements in the performance of the concrete with the incorporation of fibers and NS. The combination of 1% WTSF and 0.5% NFSB demonstrated superior performance, achieving a compressive strength of 42.93 ± 1.3&#xa0;MPa, a 20.5% increase. Additionally, it showed a 55.2% improvement in flexural strength and a remarkable 135.6% increase in tensile strength when compared to the control mix. The incorporation of hybrid fibers and NS led to improved impact resistance and freeze-thaw durability. Specifically, the 0.75% WTSF + 0.75% NFSB mix exhibited a 3.02% reduction in strength after 160 freeze-thaw cycles, in contrast to a 6.81% loss observed in the control mix. This investigation reveals that the combination of 1% WTSF and 0.5% NFSB represents the most effective formulation for rigid pavement construction, providing an ideal balance of mechanical strength and durability. The results show that adding recycled fibers in fiber-reinforced concrete along with nano-silica significantly improves pavement performance under heavy traffic and environmental conditions.</p>

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Enhancing the Mechanical and Durability Performance of Rigid Pavement Concrete Using Nano Silica and Recycled Hybrid Fibers

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Amir Hamza Khan,
  • Arslan Ashraf,
  • Kashif Zahoor,
  • Md Atowar Rahman Prodhan,
  • Zhuohang Li

摘要

This study investigates the effects of recycled fibers and nano silica (NS) on the mechanical properties and durability of concrete for rigid pavement applications. Waste tire steel fibers (WTSF) and nylon fibers from scrap paintbrushes (NFSB) were incorporated into concrete mixes to enhance flexural, compressive, and tensile strengths, as well as durability under various environmental conditions. The experimental findings indicated notable enhancements in the performance of the concrete with the incorporation of fibers and NS. The combination of 1% WTSF and 0.5% NFSB demonstrated superior performance, achieving a compressive strength of 42.93 ± 1.3 MPa, a 20.5% increase. Additionally, it showed a 55.2% improvement in flexural strength and a remarkable 135.6% increase in tensile strength when compared to the control mix. The incorporation of hybrid fibers and NS led to improved impact resistance and freeze-thaw durability. Specifically, the 0.75% WTSF + 0.75% NFSB mix exhibited a 3.02% reduction in strength after 160 freeze-thaw cycles, in contrast to a 6.81% loss observed in the control mix. This investigation reveals that the combination of 1% WTSF and 0.5% NFSB represents the most effective formulation for rigid pavement construction, providing an ideal balance of mechanical strength and durability. The results show that adding recycled fibers in fiber-reinforced concrete along with nano-silica significantly improves pavement performance under heavy traffic and environmental conditions.