Mechanism of Cement-based Materials in Chloride Environment
The physical and chemical effects of steel corrosion, freeze-thaw damage and erosion environment are the main causes of concrete failure, among which steel corrosion is the first; and chloride ion is an important cause of steel corrosion in concrete, and the cement-based materials are deeply studied. The mechanism in the chloride salt environment, mastering the penetration and diffusion of chloride ions in cement-based materials, is of great significance for guiding the optimization design of concrete materials and improving the durability of concrete. In this paper, electrochemical methods, SEM-EDS analysis and mercury intrusion method were used to study the chloride ion of high performance cement-based materials under the synergistic action of chloride salt + stress, chloride salt freeze-thaw and chloride salt + stress + freeze-thaw. Permeability and steel corrosion and its mechanism; using gray theory, chemical analysis, microscopic test and other theories and methods to systematically study the properties and mechanism of cement-based materials for solidification and external ion chloride ion. The paper focuses on the mineral composition of cement and minerals, The type and amount of the agent, the relationship between the service environment and the performance of the solidified chloride ion and its mechanism.