Abstract:

With Permit ion migration experiments and concrete surface resistivity test the chloride ion diffusion coefficient and the concrete surface resistivity of the five concretes were measured and the relation between in situ results and ASTM C1202 electric flux for 6h in the laboratory were analyzed. The mathematical relationship between a protective layer of concrete chloride ion diffusion coefficient and surface resistivity of concrete was established, and the service life of reinforced concrete beams was calculated by in situ testing results under the marine environment. The results showed that there was good correlation between the concrete surface resistivity of the concrete cover, in the steady state the action of chloride diffusion coefficient and 6 h charge. Permit experiments and the concrete surface resistivity were tested and evaluated the permeability of the concrete in situ, and concrete surface resistivity was easy in engineering applications.

Key words:  concrete cover, chloride diffusion coefficient, concrete surface resistivity, in situ, permeability, durability