The Rehabilitation of the Underpass Bleicherweg in Zürich

In Zurich the underpass Bleicherweg had to be maintained. An important part of the job was the pavement. The civil engineering department of the city of Zurich decided that the original asphalt pavement had to be replaced with a concrete pavement. The base of this decision, minimize possible water vapor pressure from groundwater, will be described in the paper. To this also the special measures to prevent problems with the interaction between old and new concrete, cracking and a steep incline as well as the results of preliminary test will be discussed. The concrete is tailor made for this project and will give information for future projects.