Abstract: Concrete is the important construction material used in the construction of all over engineering, it is a economic material and it is widely available in nature. Due to the rapid usage and fast construction development in all over the world, the shortage of natural aggregates (fine and course aggregate). The replacement of fine aggregate and course aggregate with waste materials. In this study, fine aggregate was replaced by fumed silica with various percentages of 0, 5, 10 and15%.