Damage and destruction of concrete, depends on the formation of cracks and micro-cracks. By increasing of loading, micro-cracks are connected together, and create the cracks. In order to solve this problem and create a homogeneous situation, in recent decades, a number of thin filaments that spread throughout the volume of concrete is used, which is called fibers. Glass fibers, are the most widely used fibers in concrete. Glass fiber Reinforced concrete is a composite material consisting of a mortar of hydraulic cement and fine aggregates reinforced with glass fibers. Using glass fibers in concrete improves the properties of concrete such as increasing tensile strength, flexural strength, impact strength, energy absorption, improvement of nonlinear behavior of concrete and ductility. Since the properties of glass fiber reinforced concrete are in direct contact with the conditions of glass fibers used in concrete, the topices related to the performance of glass fiber during the time, always have been considered by researchers. During the time, the factors such as alkaline environment of concrete and cement hydration products, damage the glass fibers cause the changes in the mechanical properties of glass fiber reinforced concrete. In this study, the alkali resistant glass fibers were used to reduce the effects of the alkaline environment of concrete and to prevent the damaging effects of cement hydration, pozzolanic materials have been used with different percentages. In this research to evaluate compressive strength, bending strength and toughness index of GFRC were performed with two methods of pre-mixed and spray, 15 mix designs with different percentages of glass fibers and pozzolanic materials (micro silica, metakaolin and nano silica) in pre-mixed method and 14 mix designs in spray method, have been tested. By studing the test results, it can be concluded that the compressive strength of glass fiber reinforced concrete, depends largely on the quality of the mortar. It can be seen that the addition of glass fibers to the cement matrix reduces the compressive strength of concrete. Also by adding pozzolanic materials, reduction in the compressive strength of glass fiber reinforced samples was at least. The results show that the addition of glass fibers to the cement matrix significantly improves the modulus of rupture. By increasing the amount of glass fiber, modulus of rupture first rises and then declines. Pozzolanic materials improve the modulus of rupture in glass fiber reinforced concrete. Also with aging, the reduction in modulus of rupture of GFRC containing pozzolanic materials is minimized. In this study, the area under the load-deflection curve is used to obtain the toughness of glass fiber reinforced concrete. Generally, using glass fiber improves toughness of concrete. The results show that with increasing the amount of glass fibers, all three toughness indices increased. However, the increase of I 5 is negligible. In fact, this shows that, in the larger displacement, more energy is absorbed by the glass fibers. Using 10% and 15% metakaolin, provides the highest mechanical properties for glass fiber reinforced concrete. According to this research, the use of nano silica causes a reduction in compressive strength, bending strength and toughness of glass fiber reinforced concrete. Key words: Glass fiber reinforced concrete (GFRC), Micro silica, Metakaolin, Nano silica, Compressive strength, Bending strength, Toughness index