A rapid method to determine the chloride profile in cement-based materials by using electrical field

摘要

In this study, the electrochemical technique is applied to accelerate chloride-ion migration in cement-based material to estimate its permeability. This article presents a simplified procedure to obtain the chloride profile in cement-based materials after the accelerated chloride migration test. The chloride profile can be obtained from the total amount of chloride and the surface chloride content. A good correlation is observed between the charge passed and the total amount of chloride during the non-steady-state condition, and the approximate surface chloride content can be obtained from the chloride content at the first slice (about 5mm thickness). A simplified procedure using the charge passed and the near surface chloride content is developed to obtain the chloride profile. The chloride penetration depth is determined from the profile and the depth can be used to determine the non-steady-state chloride migration coefficient.