Study On Chloride Ion Corrosion Mechanism And Simulation Of Concrete Under Alternating Wet And Dry

The durability of the concrete structure has become an important issue in current engineering field, which not only affects the service life of concrete structures and maintenance cost, but also affects environmental protection and sustainable development of society. Therefore, concrete structure early damage problem cause of the erosion of chloride ions has already become a focal point in the research of engineering field. Currently, scholars studies focused mostly focused on the transmission mechanism of chloride ions in the concrete structure. Due to the circulation of chloride erosion under the wet-dry cycle, reinforced concrete structure’s internal corrosion becomes more serious. The saline lake and coastal environment, which provide favorable conditions for the cycle, are of great significance to the study of the durability of concrete structure of chloride ion in the transmission mechanism of the above two kinds of environment and many factors of affecting the process. This paper systematically derived the transmission mechanism of chloride ion inconcrete from the transmission mechanism of water in concrete, according to the Fick’s second law. Content measured by the Fick’s second law to the analytical solution of the equation in each layer of concrete chloride ion method of approaching and chloride ion diffusion coefficient, the result is close to chloride ion diffusion coefficient and diffusion coefficient obtained by hierarchical numerical calculated, and find that the diffusion coefficient and time is power function form, and with the passage of time gradually decreases and finally tends to be stable. In the derivation of chloride ion in concrete diffusion in the actual environment influence the variability, the diffusion coefficient of degeneration and the diffusion coefficient of different concrete in different water cement ratio and diffusion coefficient of the actual environmental impact are considered, and simplified the formula and at the same time joined the above factors influence efficient. The calculation results and the measured values are compared by the calculation model of chloride ion experience simplified, found in good agreement, which can be used to predict and chloride ion transport processes and has certain practical significance.