Chloride-Induced Steel Corrosion in Concrete Under Service Loads by Hailong Ye & Chuanqing Fu & Ye Tian & Nanguo Jin

Author:Hailong Ye & Chuanqing Fu & Ye Tian & Nanguo Jin
Language: eng
Format: epub
ISBN: 9789811541087
Publisher: Springer Singapore

Figure 3.14 shows the chloride profiles both in the vertically and parallel directions in the cracked zone and deeper zone from 5 to 30 mm. The crack has a complex shape and the method of simplifying the crack characteristic also results in some errors. In addition, because of the concentration difference of every point among the cracked zone, every point along the crack surface serves as a new boundary for chloride ingress vertically into the cracked zone. From the point of selecting the thickness of the cracked zone, it can be seen that within the distance from the crack surface to about 5 mm from each side, the concentration of chloride ions changes more dramatically than that in a deeper zone. It also can be seen that at the same distance away from the crack surface, the higher chloride concentration at the crack surface, the higher concentration inside the crack zone. These phenomena can be explained by that the mechanism of chloride transport in the cracked zone is a diffusion-dominated process. It is assumed that if the concentration of the chloride ions solution in the crack is uniform, the chloride ions content in the cracked zone would not change along with the depth from the exposed surface.

Fig. 3.14a Chloride ions profiles for the specimen with a surface crack width of 0.1 mm. b Chloride ions profiles for the specimen with a surface crack width of 0.2 mm

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