ABSTRACT
The results of investigation works showed that the repair of individual parts of the structure is possible, including the removal of damaged concrete and local repair of concrete surfaces. The first repair method would consist of hydrodemolition of damaged concrete surfaces, placement of additional reinforcing bars where necessary and the repair of damaged concrete surfaces. Since girders were prestressed with adhesion, they should be repaired segment by segment, using high quality mortars with high early strength and compensated shrinkage. It would be necessary to wait 5 to 7 days in order to move to the next phase, in order to prevent loss of prestress. At this rate, the duration of works on one span would be 45 days, which means that the repair of one structure would last 180 days in ideal conditions. Extension of works would reduce the traffic flow and increase the possibility of accidents. The cost of this rehabilitation would amount to 1.7 million euros. The second method would be a complete replacement of the structure, which means that it would be necessary to stop the traffic on the motorway completely, during disassembly of certain parts, especially during the construction of the new structure. The cost would be 800,000 euros. The third method would be the replacement of the entire overpass superstructure and the repair of head beams, piers and abutments. The evaluated cost of this repair method is around 300,000 euros. After consulting the owner about the repair costs, temporary traffic regime during the works, the duration of
works and the designed service life of the structure, the third repair method was chosen.
