A New Approach to Evaluate Penetration Coefficients of Chloride Ion Based on Chloride Profiles

In disposal the chloride profiles of concrete after a period of exposure,the manners of collecting concrete powder,measuring and expressing chloride contents all can influence the evaluating results.In different periods and different environments,the forms of chloride profiles are different.It's not reasonable to use the apparent surface concentration as main coefficient in evaluating chloride invading character.By analyzing and comparing,an approach which using interface of convection zone and diffusion zone as the diffusion surface,and using the chloride concentration in interface as diffusion surface concentration is suggested to evaluate invading character of chloride ion and predict lifespan of structure.