Abstract: The effect of crashing damage on the performance of RC beams repaired with polyester glue line was investigated and presented in this study. Seven reinforced concrete beams (12×18×122 cm) were tested under two points loading condition until failure. Two parameters were studied experimentally. Prior to rehabilitation 3 cm of compression zone (0.2 D) of the beams was removed to different levels of damaging (10, 20 and 30% of tested length). The rehabilitation with polyester glue line was accomplished in two approaches. First one only the polyester glue line was applied on damaged zone of RC beams while shear connecters were used in the second approach. The data indicated that pre-damaged rehabilitation RC beams exhibited ultimate capacities about 24.1% average higher than that of undamaged beam. Also, the results showed that the increase of the load capacity when the shear connecters were used was slightly as compared with the case of rehabilitation without shear connecters. The study shows that polyester glue line was able to recovery flexural strength of damaged beams.