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Durability of reinforced-concrete track sleepers

During the regular track inspection of railway lines in various parts of the Republic of Croatia, cracks were found on prestressed reinforced concrete sleepers. These sleepers were installed between 1990 and 2003 in different parts of Croatia, on different surfaces, on railway lines with different intensity and for different types of transport. In order to determine the cause of damage and to estimate the remaining service life of the installed sleepers, the damaged and intact concrete sleepers need to be examined and analyzed. The results have to be compared with the experiences of other railway administrations that have similar problems. Based on the obtained results, it is possible to estimate the service life of concrete sleepers depending on the conditions during operation. It is also possible to estimate how long the damaged sleepers can function as part of the railway.