Penetration Laws Of Chloride Ions In Concrete Infrastructures At Coastal Ports

Chloride-induced corrosion is an important content of the durability on concrete facilities at coastal ports. The vertical distribution & circumferential distribution of chloride ions in concrete infrastructures and the relationship between chloride diffusion coefficients and concrete depths have been discussed in this paper. The Multi-Environment Time Similarity (METS) has also been presented in this paper. The research on penetration laws of chloride ions is valuable for the improvement of mechanism of reinforcement corrosion, service life predictions and chloride transport in concrete under multi-environment in theory and provides a project basis for durability evaluation system on concrete structures.On-site investigation and theoretical analysis are the main methods in this paper. The conclusions are believable because of a large number of test data of chloride concentration from the Zhapu port. The commercial softwares Excel, Origin and Matlab have been used to analyse the statistical laws of these test data. The results show that, the chloride concentrations and diffusion coefficients are both a one-humped function of elevations (can also be the time scale of seawater infiltration), they increase with the increase of elevation until they get to the peak value, and then decrease with the increase of elevation; an evident relationship is being between the surface chloride concentrations and the wave forces acted on the concrete surface, while there is no much difference among the diffusion coefficients; the diffusion coefficients get to bigger as the depth from the concrete surface increase in the influence of the capillary structures evolution and chloride concentration, but this tendency of change was alleviated with the increase of depth.