Efficiency of Concrete Coatings on Chloride-Induced Corrosion of Reinforced Concrete Structures

Concrete coatings are widely used to improve durability of new structures,

as well as in rehabilitation, in order to protect reinforcement against

chloride-induced corrosion. Organic and polymer modified cementitious

mortars applied on concrete surface in chloride containing environment were

studied with five years long tests. Coating have been tested on concrete

with two water/cement ratio. The effect of the coatings on time-to-corrosion

has been studied by the monitoring of the corrosion behaviour of reinforced

concrete specimens subjected to chloride ponding: corrosion potential,

corrosion rate and chloride profile have been carried out. The results have

been elaborated to estimate the chloride diffusion coefficient of the tested

coatings. Data have been used to predict the effect of the coatings on the

service life of reinforced concrete structures subjected to chloride

corrosion by using analytical solution of the 2nd Fick’s law of

non-stationary diffusion derived from an analogy with heat transfer

(Fourier’s law).