An experimental study to identify the influence of reinforcement corrosion on steel-concrete bond stress
In this study, a testing disposition of electrochemical corrosion was established to obtain reinforced concrete samples having different corrosion rates of steel bars in a short time (unit by days). The samples tested were made of different concretes with strength class B30, B40, B50, respectively, and steel bars of diameter of 12 mm. The ratio K between the actual corrosion rate by mass loss of steel bars and the theoretical corrosion rate by Faraday’s law, was determined to better estimate the duration of accelerated electrochemical corrosion process. The steel-concrete bond test was carried out on the samples to identify the relation between bond stress and different corrosion rates: (i) corrosion rate ranging from 0 to 2%, (ii) corrosion rate of about 6,5%, (iii) corrosion rate of more than 8,4%.
Keywords: reinforced concrete; electrochemical corrosion; chloride ions; Faraday’s law; steel-concrete bond stress.