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<p>This study investigates the effects of incorporating Class F fly ash and glass fibers on the mechanical performance of Recycled Aggregate Concrete (RAC). Class F fly ash, with a calcium content of 3.2% (as determined by the Rapid EDTA test), replaced 20% of Ordinary Portland Cement. Glass fibers were added at 0.5% and 1.0% by volume. The control mix, with a water-to-cement ratio of 0.55 and a cement: fine aggregate: recycled coarse aggregate ratio of 1:1.81:3.04, was used as the benchmark. At 28 days, the addition of 0.5% glass fibers led to a 35.03% increase in splitting tensile strength and a 45.57% increase in flexural strength, though compressive strength decreased by 19.5%. Increasing the fiber content to 1.0% resulted in reductions in all strength parameters, indicating diminished effectiveness beyond the optimal fiber dosage. The use of fly ash alone caused reductions of 12.24% in splitting tensile strength, 12.34% in flexural strength, and 8.5% in compressive strength compared to the control. Despite these reductions, the combined use of 0.5% glass fibers and 20% fly ash produced the most balanced mechanical performance. These findings support the suitability of the proposed mix for sustainable, low-grade structural applications by effectively utilizing recycled and industrial waste materials.</p>

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Study on the mechanical properties of concrete with recycled aggregates, glass fibers, and fly ash: exploring environmental waste utilization

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • Samrat Poudel,
  • Ajaya Subedi,
  • Binod Khadka,
  • Ashish Poudel,
  • Binaya Adhikari,
  • Bhum Bahadur Thapa,
  • Tek Raj Gyawali

摘要

This study investigates the effects of incorporating Class F fly ash and glass fibers on the mechanical performance of Recycled Aggregate Concrete (RAC). Class F fly ash, with a calcium content of 3.2% (as determined by the Rapid EDTA test), replaced 20% of Ordinary Portland Cement. Glass fibers were added at 0.5% and 1.0% by volume. The control mix, with a water-to-cement ratio of 0.55 and a cement: fine aggregate: recycled coarse aggregate ratio of 1:1.81:3.04, was used as the benchmark. At 28 days, the addition of 0.5% glass fibers led to a 35.03% increase in splitting tensile strength and a 45.57% increase in flexural strength, though compressive strength decreased by 19.5%. Increasing the fiber content to 1.0% resulted in reductions in all strength parameters, indicating diminished effectiveness beyond the optimal fiber dosage. The use of fly ash alone caused reductions of 12.24% in splitting tensile strength, 12.34% in flexural strength, and 8.5% in compressive strength compared to the control. Despite these reductions, the combined use of 0.5% glass fibers and 20% fly ash produced the most balanced mechanical performance. These findings support the suitability of the proposed mix for sustainable, low-grade structural applications by effectively utilizing recycled and industrial waste materials.