<p>Bamboo has drawn a lot of attention due to its strength and sustainability over the past years. Considering its economic and environmental benefits, this study explores the effect of alkali-treated bamboo fibres on the performance of self-compacting concrete incorporating recycled aggregates. A comparison of various properties of two species of bamboo: <i>Dendrocalamus</i>&#xa0;<i>strictus</i> and <i>Pseudoxytenanthera ritcheyi</i> was conducted. The fibres with an aspect ratio 40 (length of 40&#xa0;mm and a diameter of 1&#xa0;mm) were treated with 2% and 4% NaOH solution, chosen based on their effectiveness in modifying fibre surface characteristics without compromising structural integrity prior to their incorporation in self-compacting concrete containing mixed recycled aggregates. A fibre volume fraction of 0.25% was used to assess their impact on the fresh, hardened, durability and microstructure properties of concrete. The results indicated that treated <i>P. ritcheyi</i> exhibited higher cellulose content of 76.5% and tensile strength of 484 N/mm² compared to <i>D. strictus</i> with values 69% and 406 N/mm² respectively, suggesting its greater suitability for enhancing concrete performance. Concrete with 2% NaOH treated <i>P. ritcheyi</i> fibres improved compressive and flexural strength of control mix by 14.8% and 3.75% respectively and microstructure analysis showed an excellent binding between the hydrated binder matrix and the fibre surface. The results of this investigation validate the potential of bamboo fibres as a viable substitute for traditional synthetic fibres in structural applications.</p>