|Bridge rehabilitation A9
|Riddes, Valais, Switzerland
|50mm thick UHPFRC roadway layer
|June – October 2021
|High durability, structural sealing
|1,500 m³ concrete
|Amount of fibres:
Up to 10,000 vehicles a day
A safe ride on UHPC
The well-known viaduct from the seventies is getting on in years. Most recently, the maximum vehicle weight even had to be reduced from 40 tons to 3.5 tons. The prestressed concrete box girder structure showed considerable water leaks, corrosion at the prestressing cables and the reinforcement as well as extensive concrete damage due to an alkali aggregate reaction.
In order to make the bridge passable for heavy traffic again, it was decided to rehabilitate the bridge with ultra-high performance fibre-reinforced concrete, removing the old road surface and the damaged structural concrete. All damaged areas on the box girders and the entire pavement were rehabilitated and reinforced with a 50 mm thick layer of UHPC. In addition to reinforcing the structure, the ultra-high strength steel fiber reinforced concrete also serves as a structural sealing. Thus, the busy bridge can be opened again for the very large trucks in the future.
"We won't be able to avoid UHPC in the future."
Dr. Christian Neunzig
Technical Manager Construction Technology