Fiber reinforced concretes due to their acceptable performance on structural members have been evaluated in many research. Planty of materials have been used in combination with the concrete and caused researcher focused on the concrete compressive strength. In this experimental regard, effects of three types of fibers such as Glass, Carbon and double hook steel on tensile strength, compressive strength and slump of standard concrete samples have been investigated. Four various weight ratios for any of these fibers are used (0.5, 1.0, 1.5 and 2% of cement weight). Analysis is done on the 7 and 28 days of concrete age and a simple concrete sample is existing to compare with fiber concrete samples. Results showed that in all dosage of Glass and Steel, compressive strength is increased but in samples with carbon fibers in 1.5 and 2% is decreased. Tensile strength in all used dosage of fibers is increased. Slump values of all fiber samples are decreased and maximum decrease experienced in glass fiber samples. Manuscript profile