1) The document studies the flexural strengthening of reinforced concrete beams using Engineered Cementitious Composites (ECC). 2) Five beam specimens were tested - one control beam and four beams strengthened with different ECC mixes. The ECC improved the load capacity and deformability of the beams. 3) The beam strengthened with ECC containing 50% ground granulated blast furnace slag showed the highest flexural strength and load capacity, demonstrating the benefits of ECC confinement for reinforced concrete beams.