COMPARATIVE STUDY ON TESTING METHODS OF CHLORIDE IONS DIFFUSION COEFFICIENT IN CONCRETE

In this paper, chloride diffusion coefficients in concrete were experimented and studied in deferent water cement ratio by the alternating current bridge method and the NEL method and natural dispersion method. The general methods to evaluate chloride diffusion coefficient in concrete are briefly introduced, and simultaneously, advantages and disadvantages of these methods have been figured out. The correlation relationship between chloride diffusion coefficients and water cement ratio and porosity and compressive strength of concrete have been analyzed and studied based on the results of these tests, analyzed results show that appraisement of the three testing methods is different, and that'll be helpful and useful to select testing methods for chloride diffusion coefficient evaluation at different state.