Durability And Service Life Prediction Of Reinforced Concrete Structure Exposed To Chloride Environments

Based on theoretical analysis, experimental and field test data, the method of durability evaluation and service life prediction of reinforced concrete structure exposed to chloride environments are studied in the paper.On the basis of the theory of reinforcement corrosion caused by chloride , a chloride diffusion model considering the time-dependent quantities of diffusion coefficient and surface chloride concentration for predicting the content of chloride in concrete is presented in this paper, at the same time, the determination of model factors are analyzed. The diffusion model is verified by a number of field and experimental data.The condition of reinforcement initial corrosion and durability limit state equation have been established. Based on probability statistics and structure reliability theory, a method of calculating the durability period and reliability probability of reinforced concrete exposed to chloride environments is presented. The target reliability level that the time of reinforcement initial corrosion in concrete structure exposed to chloride environments is proposed in this paper. A method of predicting service life of concrete structure exposed to chloride environments is given in this paper. An example of durability evaluation of concrete structure is given as well.Lastly, The minimum cover depth of concrete that concrete structure exposed to the splash zone and near marine environments needed is discussed, some proposition about design and construction of reinforced concrete structure exposed to chloride environments are presented .