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.
|Publication status||Published - 1 Dec 2004|
|Event||European Corrosion Conference: Long Term Prediction and Modelling of Corrosion, EUROCORR 2004 - Nice, France|
Duration: 12 Sep 2004 → 16 Sep 2004
|Conference||European Corrosion Conference: Long Term Prediction and Modelling of Corrosion, EUROCORR 2004|
|Period||12/09/04 → 16/09/04|