Abstract: This study, about the replace of fine aggregate with the crushed spent fire bricks and some of the wastes are been used in the land filling in the constructions. Those bricks are been wasted in the construction by brakeage by loading and unloading. The compressive strength is been compared in the study, the replacement on the percentages (25, 50, 75, 100%) at 7, 14 and 28 days, respectively. Then, the compressive strength is tested and tabulated.