Study On The Durability Of Reinforced Concrete Structure In Marine Environment

Reinforced Concrete structures have been widely,for Reinforced Concrete structures can make the best use of both concrete and steel bars.But the durability of concrete structures is not satisfied due to various causes,especially chloride's influence on corrosion of steel bars in marine environment.After the building structures were served for several years, chloride penetrate through the concrete protective coating,and the safety of the structures declines.If steel bars are corroded,the material behavior of steel bars are changed,the bond behavior between concrete and steel bars are also changed,then the behavior of structural members and structures will change also. Several problems of the durability of the Reinforced Concrete structures in marine environment have been studied in this paper, including chloride's ingression in concrete, performance of concrete in marine environment, RMA's influence on durability of Reinforced Concrete structures, and so on.The damaging characters of marine concrete structures and mechanism are studied in the paper,and analyzed deterioration of the Structural Properties of Corrosion Reinforced Concrete Members. Based on Faladi's theory and chloride's influence on passivating film, predetermine model of reinforcing bar uneven corrosion model was established.The distribution of chloride in different concrete has been studied by chloride content test in the paper. The performance of concrete in marine environment is studied through a practical engineering example, the corrosion amount of the reinforcing bar in different concrete is examined,and discussed Life Forecast of Concrete Structure.The remaining Life of Concrete structure is putted up.The means to enhance the concrete durability of marine concrete structure are discussed.Through the dry and wet cycling experiment on concrete members, RMA's influence on corrosion of steel bars are studied,and the position of initial corrosion and the corrosion amount of the reinforcing bar are analyzed in different RMA's content.The influence of the complex of water-reduced admixture and RMA on the mechanical property of concrete member and chloride's diffuse coefficient in the end.