Chloride Penetration into Concrete under the Coupling Effects of Internal and External Relative Humidity

Figure 11

Curves of chloride content by convection and concentration gradient. (a) After 2-week chloride attack (w/c = 0.4), (b) after 16-week chloride attack (w/c = 0.4), (c) after 2-week chloride attack (w/c = 0.6), and (d) after 16-week chloride attack (w/c = 0.6). “2 w Cl⁻” represents that chloride content was immediately determined after 2-week chloride attack (control group); “2 w Cl⁻ + 8 w CM” presents that the concrete was first subjected to the chloride attack for 2 weeks, and then all the surfaces were sealed and standing for 8 weeks, and in this case, chloride migration (CM) was by the concentration gradient.

(a)

(b)

(c)

(d)