Abstract:

At present, the durability design of concrete structures is mostly based on the research of complete concrete, and the actual concrete structures are mostly multiphase composite materials with cracks, so the service life of concrete structures is overestimated to some extent. The content of free chloride ions in concrete is measured by chemical titration. The effects of lithium slag content, load and crack width on the distribution of free chloride ions are studied, and the diffusion coefficient of chloride ions is calculated. The results show that: (1) In the mixed solution of sulfate ions and chloride ions, the content of free chloride ions is significantly reduced, and sulfate ions can effectively slow down the transport of chloride ions in concrete; (2) The addition of 20% lithium slag can reduce the transport rate of chloride ions in concrete; (3)The transport rate of chloride ion in concrete increases with the increment of load and crack width.

Key words: concrete, chloride ions transport experiment, lithium slag, load, crack