Study on the spatial distribution of the chloride ion supply in the superstructure of an open-type wharf

ABSTRACT The penetration of chloride ions into concrete is recognized to not be a homogeneous process. The aim of this study is to reveal the factors underlying the spatial variability of chloride ion penetration into concrete via the superstructure of an open-type wharf. The chloride ion contents of two slabs (Slab-L and Slab-S) obtained from an open-type wharf that was about 30 years old were measured. The surface chloride ion content (C₀) in Slab-S varied widely and the average value of C₀ in both slabs significantly differed. From the distribution of C₀, it was found that C₀ at the back side of each slab was relatively higher than that at the middle and front side of the slabs. In conclusion, it was found that the distribution of C₀ was affected by factors including the location of the slab, the environmental conditions such as the sea level, and the other structural members surrounding the slab.