Port concrete structures usually need specific protections to improve their durability.In recent years,the silane-based water repellent agents have been used widely for the surface treatment of concrete structures and reliability of this technology has been demonstrated through extensive laboratory tests.However,in the engineering practice,the effectiveness of water repellent treatment may be significantly influenced by the construction performance due to many uncertain restraints on the construction site.Therefore,it is significant to evaluate appropriately the construction performance for the durability and service life design of port concrete structures with water repellent treatment.This paper expounds the results of a detailed investigating program on a newly built port structure,the surface of which was treated with water repellent agents from the concrete cover depth,the silane penetration depth,and the half-cell potential of the internal steel reinforcement.The observation has facilitated important information for the future construction of port concrete structures and laid a solid foundation for the durability and service life design of water repellent concrete structures exposed to marine environments.