As part of the VO “Maintenance and retrofitting of concrete structures”, students were able to experience the refurbishment of the bridge “Prater-Hochstraße” as a section of the A23 south-east bypass Vienna up close last Wednesday (07.05.2025). 

On site, ASFINAG and PORR Group provided exciting insights into the extensive measures: Over a total length of more than 600 meters, the road surface as well as the bridge waterproofing in the edge areas will be renewed as part of the renovation. In addition, the steel restraint system including noise protection panels (known as the “Wiener Stahlleitwand”) will be repaired. The planning was carried out by FCP Fritsch, Chiari & Partner ZT GmbH. 

Students were able to see the casting of the first and second layer of bituminous waterproofing, removal of corrosion on the outside of the steel parts using a sandblasting process and the removal of damaged concrete parts using a high-pressure water jet. 

Many thanks to ASFINAG and PORR Group for the excellent organization and guidance! This excursion was a valuable opportunity for all students to gain practical experience and to see the importance of maintenance of existing bridge infrastructure.