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Repeated cyclic loading is organized on a part that causes fatigue fracture. As which occurred on the concrete beam bridge that receives the brunt of the weight of the vehicle. The modulus of elasticity of concrete varies depending on the strength of concrete, type of loading, characteristics and a comparison between cement and aggregates. Concrete with the substitution of cement in conditions of static load tendency to be stronger than normal concrete, this research used substitute material cement is Ground Granulated Blast Furnace Slag (GGBFS) are classified as waste (hazardous and toxic substances) that have properties resembling cement, so that expected to reduce waste slag as an alternative material partial replacement of cement. Preliminary testing has been conducted to determine the optimum value substitution GGBFS on concrete quality (fc) 30 MPa and a maximum in 50% PCC and 50% GGBFS. In this research used 4 specimen concrete beam size 20 x 30 x 330 cm, 3 specimen concrete beams each beam with high levels of 45%, 50% and 55% GGBFS, and 1 specimen of normal concrete beams as a comparison so in this research expected that GGBFS concrete beams that require cyclic produce better durability than normal concrete.