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Fire disasters could occur in the area around the bridge so that fire contact against the concrete and causes construction run into extreme temperature rises. Concrete which affected with high temperature will lost its strength significantly by 60%. To overcome this problem is utilizing steel industry waste, that is Ground Granulated Blast Furnace Slag (GGBFS) which is used as a substitute for cement in concrete mixtures. The properties of GGBFS which is cementitious same as cement, so that it can fulfill the function of cement. In this research, GGBFS concrete and normal concrete with strength of concrete is 30 Mpa and both types of concrete will be burned at a temperature of 600˚C for 2 hours. After that, characteristics strength of concrete will be tested to GGBFS concrete and normal concrete in each concrete before being burned and after being burned. The result of this research is GGBFS material optimization as a substitute of cement to concrete along with the comparison of concrete characteristics shows that GGBFS concrete is stronger than normal concrete nor before and after being burned. Therefore, girder beams with GGBFS has better strength and resistance to fire than normal concrete.