Abstract:In this paper, the damage behavior of high performance concrete (HPC) due to the combined action of freezing thawing cycles and loading was investigated. Results indicate that the frost resistance of HPC decreases with the increase of stress ratio, especially for HPC without air entraining agent. The resistant to the combined action for HPC is significantly improved when steel fiber, air entraining agent or combination of them are added, and the restraint ability from the damage of HPC with steel fiber and air entraining agent together is higher than that of HPC with steel fiber or air entraining agent alone. Moreover, the damages due to the combined action is much larger than the sum of damages due to the separate action of both factors.