Ema Kato, Yoshitaka Kato and Taketo Uomoto
Journal of Advanced Concrete Technology,
3(1) 85-94, 2005
Chloride-induced deterioration is the most important
deterioration phenomenon in reinforced concrete structures under marine environments.
When a crack occurs in cover concrete, it may initiate and accelerate corrosion of
steel reinforcement embedded in concrete. The performance of reinforced concrete
structure may subsequently decrease even in the early stage of its service life.
In this paper, for making clear the mechanism of chloride-induced deterioration,
chloride ion transportation in cracked concrete was experimentally investigated and
a simulation model for chloride ion transportation in cracked concrete was proposed.
The zone having a crack was treated as the exposed surface of concrete in the proposed
model of which chloride transportation was assumed to be governed by the density
of chloride ion solutions in the crack. In addition, effects of crack width and an
apparent diffusion coefficient through the crack on chloride ion transportation were
numerically investigated and the applicability of the proposed model was discussed.