Abstract- This study’s goal was to assess the effects of replacing cement with fly ash and adding hooked steel fibres on the mechanical properties of concrete. For the M30 grade, samples of fly ash concrete with replacement percentages of 5, 10, 15, and 20 were employed. The results showed that the mechanical strengths rose up to 10% FA replacement and thereafter started to decrease. After 28 days, it was discovered that for FA10 samples, 10.06 percent, 15.38 percent, and 9.83 percent, respectively, of the split tensile, compressive, and flexural strength had been improved. To samples of ideal fly ash concrete (FA10), hooked steel fibres were added. At 1% use of steel fibre, the flexural, compressive, and split tensile strengths of hooked steel fibre samples were increased by 13.27 percent, 18.87 percent, and 27.14 percent, respectively.