Abstract: The main aim of this paper is to evaluate the corrosion condition of reinforced concrete (RC) beams and to assess the structural behavior of corroded reinforced concrete beams. Thirty two beams were tested, of which 16 had predetermined cracks. An impressed current was applied to the beams in order to accelerate steel corrosion. Electrochemical measurements were carried out to obtain open circuit potentials and corrosion rates of the embedded steels and loading tests were conducted on the beams to measure the ultimate moment. Test results show that there existed a fair relationship between the loading capacity reduction and the corrosion condition of the RC beams.