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<p>The depletion of natural fine aggregates (NFA) has necessitated the use of sustainable alternatives in concrete pavement construction. This study evaluates the mechanical and durability performance of concrete incorporating Fine Reclaimed Asphalt Pavement (FRAP) as a partial to full replacement of NFA (0–100%) and Polypropylene Fibers (PPF) in dosages ranging from 0 to 2%. A total of 18 mix combinations were assessed through compressive strength, split tensile strength, flexural strength, water absorption, and Cantabro abrasion resistance tests. Results indicate that a blend of 40% FRAP with 2% PPF yields optimum performance, with tensile and flexural strengths improving by approximately 30–40% compared to the control. Although higher FRAP content tends to reduce compressive strength, the inclusion of PPF compensates by enhancing ductility and post-cracking behavior through fiber bridging. Durability metrics such as reduced water absorption and abrasion loss further confirm the structural integrity of the optimized mix. Microstructural investigations using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) reveal improved calcium silicate hydrate (C–S–H) gel formation and a denser interfacial transition zone (ITZ) in fiber-reinforced mixes. Statistical correlation analyses confirm strong interdependencies among strength and durability parameters, affirming the reliability of observed trends. Additionally, the optimized mix achieves a 9.6% cost reduction per m<sup>2</sup>, making it suitable for large-scale rigid pavement applications. The findings advocate for the effective use of FRAP and PPF as sustainable, durable, and cost-efficient alternatives in concrete infrastructure.</p>

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Enhancing concrete pavement performance with polypropylene fibers and fine reclaimed asphalt pavement for sustainable infrastructure

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • M. K. Diptikanta Rout,
  • Kumar Shubham,
  • Sabita Dash,
  • Sabyasachi Biswas

摘要

The depletion of natural fine aggregates (NFA) has necessitated the use of sustainable alternatives in concrete pavement construction. This study evaluates the mechanical and durability performance of concrete incorporating Fine Reclaimed Asphalt Pavement (FRAP) as a partial to full replacement of NFA (0–100%) and Polypropylene Fibers (PPF) in dosages ranging from 0 to 2%. A total of 18 mix combinations were assessed through compressive strength, split tensile strength, flexural strength, water absorption, and Cantabro abrasion resistance tests. Results indicate that a blend of 40% FRAP with 2% PPF yields optimum performance, with tensile and flexural strengths improving by approximately 30–40% compared to the control. Although higher FRAP content tends to reduce compressive strength, the inclusion of PPF compensates by enhancing ductility and post-cracking behavior through fiber bridging. Durability metrics such as reduced water absorption and abrasion loss further confirm the structural integrity of the optimized mix. Microstructural investigations using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) reveal improved calcium silicate hydrate (C–S–H) gel formation and a denser interfacial transition zone (ITZ) in fiber-reinforced mixes. Statistical correlation analyses confirm strong interdependencies among strength and durability parameters, affirming the reliability of observed trends. Additionally, the optimized mix achieves a 9.6% cost reduction per m2, making it suitable for large-scale rigid pavement applications. The findings advocate for the effective use of FRAP and PPF as sustainable, durable, and cost-efficient alternatives in concrete infrastructure.