1 Long term monitoring of a reinforced concrete remediation method in a marine environment Liam Holloway * , Nick Birbilis, and Maria Forsyth The School of Physics and Materials Engineering, Monash University, Australia Abstract A long-term remediation and monitoring programme for steel reinforced concrete in an aggressive marine environment is underway. The remediation techniques included cleaning and patch repair of the worst affected areas and surface application of a propriety migrating corrosion inhibitor for the less corroded areas. The efficacy of the repairs and the protection afforded by these has been investigated using analysis of core samples (for chloride and amine inhibitor components) and electrochemical methods including linear polarisation resistance and a new galvanostatic pulse technique. Particular emphasis is given to the location of the repairs on the marine structure. The results indicate that over a five-year period the effectiveness of the surface applied inhibitor is dependant on the exposure of the application site to periodic wetting. Detectable levels of the amine component of the inhibitor are still present 5 years after application. The comparison of chloride levels within the concrete show little variation from site to sight suggesting that in the cases where the inhibitor has slowed corrosion, a pore blocking mechanism of the inhibitor maybe the main mechanism of inhibition. Finally the laboratory application of a novel galvanostatic pulse monitoring technique coupled with a fitting procedure developed in our laboratories has been previously shown that it can provide useful information pertaining to the corrosion status of steel in concrete. This technique has been trailed on site and shown to be potentially valuable, but the implementation and analysis needs careful refinement and confirmation. Introduction The deterioration of concrete infrastructure due to the corrosion of the reinforcing steel holds significant economic importance [1]. One of the primary causes for the corrosion of reinforced concrete is ingress of chloride, typically from either the use of de-icing salts or the exposure to a coastal environment [2]. Infrastructure owners always want to extract the maximum possible service from their facilities in order to recoup/profit from the large placement and operation costs involved. If the service life of a structure such as a jetty can be extended at a relatively insignificant cost as compared with that of replacement the owners will benefit significantly. Thus in the past few decades, considerable research has been aimed at developing and understanding reinforced concrete corrosion mitigation techniques. Typical techniques include cathodic protection systems, re-alkalisation, desalination, sealants and inhibitors. Of these techniques our research group has payed considerable attention to concrete corrosion inhibitors particularly those organic based surface applied and admixed varieties available in the market today. Our research has compared and contrasted various inhibitor systems in an attempt to better understand the influence of relative chloride to inhibitor concentrations, possible protection mechanisms, and their longevity especially under harsh marine conditions [3-5]. Additionally a comprehensive investigation into the application of novel galvanostatic pulse corrosion