INVESTIGASI KOROSI BAJA TULANGAN BETON SIRIP DENGAN PROTEKSI KATODIK ARUS TANDING MENGGUNAKAN ANODA MMO-Ti MORTAR KONDUKTIF[Investigation Of Corrosion Of Reinforced Concrete With Impress Current Cathodic Protection Using Mmo-Ti Conductive Mortar Anode]

Abstract

In this study, impressed current cathodic protection using MMO-Ti conductive concrete anode was conducted in the new reinforced bar (rebar) concrete submerged in the seawater on the various protecting current. The aim of this study was to investigate performance of protecting current to reduce aggressive environment in the interface of new rebar cocncrete and also to evaluate new rebar concrete after application of protecting current. This technique was conducted on the various protecting current of 100, 150 and 200 mA/m² by surface area of rebar. NACE SP0290 was used as standard criteria of cathodic protection. Examinations were arried to observe the influent of protecting current at power supply ‘on’ and ‘off’ that was obtained before and after cathodic protection, such as open circuit potential (OCP) at switch ‘on’ up to 3 minutes and then switch ‘off’ up to 4 hours, tafel polarisation to record corrosion potential, polarisation resistant, corrosion rate at initial and after application of protecting current. Cyclic polarisation test was performed to know susceptibility of pitting corrosion on the rebar concrete. The result showed that this technique have been successfully applied and have been meet standard criteria of NACE SP02090. Their corrosion potential of rebar concrete obtained after 4 hours of switch ‘off’ lower as well as corrosion rate compared to sample without protecting current (PPC 1) during 30 days submerged in the seawater. Pitting corrosion not found in the all of samples.