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This paper discusses the synergetic effect of ground granulated blast‐furnace slag and hooked‐end steel fibers on the fresh, mechanical, and microstructural properties of steel fiber‐reinforced self‐compacting concrete containing fly ash. A total of 12 mixtures were prepared. Hooked‐end steel fibers at four different volume fractions (0%, 0.3%, 0.6%, and 0.9%) were applied as reinforcement, while the slag contents (0%, 10%, and 30% of the cement weight) was varied; the fly ash content (20% of the cement weight) was kept constant to partially replace Portland cement. The properties of plain and steel fiber reinforced self‐compacting concrete mixtures were tested and compared. The experimental results showed that substituting cement with 10% slag effectively enhanced the workability of the fresh concrete, while replacing cement by 30% slag reduced the passing ability and filling ability. The addition of fibers reduced the workability of self‐compacting concrete. Furthermore, the addition of slag can compensate the effect on the fresh properties caused by fibers. With respect to the mechanical properties, the synergistic effect of slag and hooked‐end steel fibers improved the compressive strength, tensile strength and flexural strength. At the microstructural level, blast‐furnace slag can enhance the bonding performance of the fiber‐matrix interface, thereby improving the mechanical properties.

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