engleski

Case Study- Corrosion Monitoring in Marine Environment in Croatia

In the last decades it has become well known that the corrosion of reinforcement is the most harmful damage that occures in reinforced concrete structures. The ''great'' example of such case happened in the Yacht Marine Split, Croatia, where the reinforced concrete structure was exposed to very aggresive marine enviroment. The old reinforced concrete construction elements had been tested in November 2001 (visual inspection, half-cell potential mapping, mechanical and chemical testing) and as a result of those testings, the experts had concluded that the serviceability and load bearing capacity of the main structure elements are critically damaged. All those testings have showed that the reinforced concrete structure was not properly designed and during building proccess not properly constructed. It has been decided to change main span structure elements, which were permanently in tidel zone and partially to use old columns, which were under water and in a good state. In the spring 2002 a new marine has been built, with prefabricated prestressed reinforced concrete elements. On one of the concrete element corrosion protection with migrating corrosion inhibitor has been applied, because of the tiny cracks, that have occured during production. Since the new elements were placed in the position according the project, the monitoring of the concrete elements with the galvanostatic pulse technique started. The galvanostatic pulse technique is a non-destructive method, suitable for on-site measuring, which is determining the free corosion potential, corrosion current and concrete resistance.The results of these measurements are presented in the paper.

case study; concrete; corrosion of reinforcement; deterioration; marine enviroment; monitoring; site measurements

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