Concrete is a material that needs strengthening in tension in order to meet the structuralrnrequirements. New techniques of strengthening concrete, besides the usual ordinaryrnreinforcement bars, are developing; fiber reinforced concrete is one of them. Fibrernreinforcement is a method that has been in use over the last 30 years, yet it is unfamiliar in ourrncountry Ethiopia.rnThis research study deals with experimental investigation of C-30 grade concrete with thernaddition of 1% ,1.5% and 2% of steel fiber, 4% & 5% glass fiber and deferent percentage mix ofrnglass steel fibre. For comparison purposes, plain control samples were also considered. Thisrnstudy was undertaken aiming to investigate the mechanical behavior of concrete reinforced withrnthe addition of steel fibers, glass fibre and mix of steel glass fibre hoping to improve therncompressive and tensile strength of the plain concrete in order to use on railway bridges slabrntrack in Ethiopia railway projects to prevent cracks on bridge slab sleepers from the reputedlyrnapplication of static and dynamic loads of the train.rnThe test program was included slump test, compressive strength test, flexural strength test andrntoughness tests including load-deflection curve for each mix series. And the results show that,rnworkability of fresh concrete was largely influenced by the presence of steel fiber and glassrnfibre; on the other hand it was unlikely to achieve considerable improvements in compressivernstrength by glass fiber inclusion but it was steel fiber indicates good improvement on thernconcrete compressive strength up to 26.37% of relative strength grain comparing with the plainrnconcrete and the flexural tensile strength and the post crack energy absorption were greatlyrnincreased with relative strength gain 66.2% and 273.73% respectively.rnHowever, further, study is still necessary in order to have a more in-depth understandingrnof the material interactions and possible practical applications.