Sažetak Prilikom redovitih pregleda kolosijeka u Republici Hrvatskoj na pojedinim pružnim dionicama uočene su pukotine na prednapetim armiranobetonskim kolosiječnim pragovima. Pragovi na kojima su uočena oštećenja ugrađeni su u periodu od 1990. do 2003. na različitim područjima, na različitoj podlozi te na prugama različitoga intenziteta i vrste prometa. Kako bi se odredio uzrok oštećenja i procijenio preostali vijek trajanja ugrađenih pragova, potrebno je provesti ispitivanja i analize

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... h i neoštećenih betonskih pragova te rezultate usporediti s iskustvima drugih željezničkih uprava koje imaju sličan problem. Na temelju dobivenih rezultata mogao bi se odrediti vijek trajanja betonskih pragova u ovisnosti o uvjetima u kojima se nalaze prilikom eksploatacije te to koliko još dugo oštećeni pragovi mogu ostati ugrađeni u kolosijek. Ključne riječi: kolosijek, betonski pragovi, oštećenja betonskih pragova, uzdužne pukotine Durability of reinforced-concrete track sleepers Abstract During the regular track inspection of railway sections in different parts of the Republic of Croatia cracks have been spotted on prestressed reinforced-concrete track sleepers. These track sleepers were built-in between 1990 and 2003 in different parts of Croatia, on different surfaces, on railways of different intensity and used for various types of transport. In order to determine the cause of damage and to estimate the remaining service life of the built-in track sleepers, the concrete track sleepers, both damaged and intact, have to be inspected and analysed. The results have to be compared with the experience of different railway administrations which have similar problems. Based on the results obtained, the service life of concrete track sleepers can be estimated, depending on the conditions during the exploitation. It is also possible to estimated how long the damaged sleepers can function as a part of the railway.