<![CDATA[Conventional Portland cement concrete production entails substantial carbon emissions, while the resulting matrix remains susceptible to microcracking. To mitigate these drawbacks, incorporating industrial by-products and recycled polymers offers a viable sustainable solution. This study investigated the flexural strength characteristics of eco-friendly concrete incorporating fly ash as a partial cement replacement at 15% by mass and recycled polyethylene terephthalate (PET) fibers at volume fractions of 0.25%, 0.5%, 0.75%, and 1%. A plain concrete mixture served as the control baseline. Flexural strength was evaluated using beam specimens at 28 days. The results showed that the optimum flexural strength was achieved at a PET fiber volume fraction of 0.25%, reaching 3.95 MPa. This value was higher than that of concrete containing 15% fly ash without PET fibers (3.02 MPa) and the plain concrete mixture (3.33 MPa). Increasing the PET fiber content beyond 0.25% resulted in a decline in flexural strength, with a value of 3.29 MPa at 1% PET fiber. The findings demonstrated that incorporating a low PET fiber content in fly ash concrete improved flexural strength, while excessive fiber content reduced flexural performance. These results highlight the potential of combining fly ash and recycled PET fibers as materials for developing more sustainable concrete.]]>
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