Narrow Results

Chloride ions begin to erode concrete in early age. In this paper, the rule of diffusion coefficient and the development of effective porosity of early age concrete mixed corrosion inhibitor in different concentrations of salt solution are analyzed through coulomb electricity method and the effective porosity test. Results show that the chloride ion penetration resistance of early age concrete increase with increase of age, weaken with the increase of chloride ion concentration. Effective porosity decreases with the increase of age and the concentration of sodium chloride solution. Concrete mixed corrosion inhibitors can effectively reduce the coefficient of permeability, the early effect is better than the late.

In this paper, the chloride ion erosion resistance of early age concrete has been studied by chloride erosion experiment under dry-wet cycles including chloride ion concentration and chloride ion diffusion coefficient, through the analysis of chloride ion diffusion performance with different curing specimen. The experiment results show that the chloride ion concentrationand chloride ion diffusion coefficient increased significantly under dry-wet cycles, however, the chloride ion erosion resistance of concrete is greatly reduced, especially in the early age.