CORROSION DAMAGE MEASUREMENT ON REINFORCED CONCRETE BY IMPRESSED VOLTAGE TECHNIQUE AND GRAVIMETRIC METHOD
Keywords:Reinforced concrete, Corrosion damage, Impressedvoltage test, Chloride penetration
This study investigated the effect of sea water on the corrosion behavior of reinforcing steel in concrete. A 3% sodium chloride solutionwas used to simulate sea water.The solution was used as mixing water as well as immersion media. Combinations of mixing and immersion media considered in this study were normal-normal water (NN), normal-sea water (NS), seawater-normal water (SN), and seawater-seawater (SS).Corrosion measurement used were Impressed Voltage Test (IVT) and gravimetric method. Results showed that corrosion current curves, gravimetric mass loss, the average and maximum current passed are severe in SS but negligible in NN. The difference between NS and SN, however, is not well defined but was shown to differ in terms of corrosion current behavior before and after cracking. Incorporating chloride in the mix, regardless of its environment, was found to cause rapid crack development in concrete. Statistical analysis suggested that the presence of chloride had no influence on the outcome of percent mass loss with respect to the control sample except in SS combination.