Concrete is one of the most widely used building materials due to its facility of production and proper physical and mechanical properties. During time and sever environment, many reinforced concrete structures began to deteriorate due to development of fissures and cracks. Hence using rebar in concrete has approximately no effect on elimination of micro-cracks propagation, so by incorporation of fibers in concrete mix, this problem could be solved. Glass fibers are the most common used fibers in concrete. The use of glass fibers in concrete improves the properties of concrete such as increasing tensile strength, flexural strength, impact resistance and increasing energy absorption. Glass fiber reinforced concrete productions may suffer a change of mechanical properties when exposed to humid environment. This reduction of tensile and flexural strength and ductility of GFRC products is known as ageing. This research investigates the effect of different curing conditions and using several pozzolanic materials on mechanical properties of GFRC in duration of time. For this purpose, GFRC specimens were manufactured with 1 and 2 percent of glass fibers and Microsilica, Nanosilica and Metakaolin as pozzolanic materials. In mix design the content of Microsilica, Metakolin and Nanosilica is 10%, 10% and 1% by weight of cement respectively. After demolding, specimens were cured in four different conditions. In first method specimens were immersed in 23°C water. In second method they were stored in fog room with atleast 16° C and 95% RH. The third method was carried out by using a curing material as liquid membrane forming and in the fourth curing condition, acrylic polymer was added to mix design as an admixture. Test results at the age of 7, 28 and 90 days of curing, showed that compressive strength, which is a matrix related property, will increase in duration of time, in all mix designs and curing conditions. Also incorporation of more glass fibers causes the reduction of compressive strength but negligibly. Modulus of rupture and toughness indices which are fiber related properties, was reduced in curing period of first and second curing methods of which are water based curing conditions. Pozzolanic materials led to largely increase of modulus of rupture. Moreover using these materials reduced the rate of degradation of modulus of rupture and toughness indices in duration of time but couldn't restrain it completely. Specimen's MOR of which cured in third and fourth curing methods, water retention curing conditions, was reduced. While an improvement in toughness indices was observed. In other hand, comparison of MOR and toughness indices of GFRC specimens containing 1 and 2 percent of glass fibers revealed that increasing glass fiber content, improves MOR and toughness indices. According to test results, the most amounts of MOR and compressive strength belongs to Metakaolin specimens and Microsilica one, respectively. While, specimens containing Nanosilica, has the least rate of degradation of MOR. It's carried out that the most amounts of toughness indices belongs to Metakaolin and Microsilica specimens respectively. In this case, the least rate of degradation has occurred in Nanosilica specimens. Key words: Glass Fiber Reinforced Concrete, Ageing, Curing, Pozzolan, Compressive Strength, Modulus of Rapture, Toughness