Flexural behavior of reinforced beams reinforced with corrosive rebar

In this paper, the effect of pre corrosion of rebars on the flexural behavior of reinforced concrete beams was investigated. The corrosion was induced at rebar artificially, before using them as reinforcement, by using two methods. In the first method, the rebar were put in water with 8% salt concentration inside the lab. In the second method, the rebars were surrounded by salt outside the lab and left them free to effect of weather changing, like rain and different relative humidity. The second method was given more corrosion rate compared to the first method. Beams were tested in the ages of 30, 90 and 120 days. Two sizes of rebars (10 mm and 12 mm) subjected to corrosion were used. Test results indicate that high corroded rebar of 10mm diameter were carried higher load capacity with maximum deflection at mid span for all ages. The percentage of increasing load for this corrosion bar was found to be 144.3%, 141.7%, 124.3% for 30 days, 90 days and 120 days, respectively, compared with those beams contain lower corroded bars of same size. The percentages were 126.1%, 127% for 30 days and 120 days, respectively, compared with no corrosion of same bar size.