In June 2000, a new motorway link (E25-E40) was inaugurated in Liège to solve transit and local traffic problems. It serves more than 65,000 vehicles a day in both directions. With multiple technical, environmental and security-related constraints, the 5 kilometres of this infrastructure prefigure numerous works such as bridges, roads, interchanges, etc. as well as 3 important tunnels of a combined length of 2.75 kilometres. For quality, durability and safety reasons, this infrastructure, and therefore the tunnels too, have been covered with a continuously reinforced concrete pavement. To take due account of the obvious size and accessibility constraints, both the building process and the composition of the concrete had to be fundamentally adapted and entailed numerous consequences: working in phases, using a mixer and transport tank, the workability of the concrete, iron framework, organization of works, surface treatment, etc. These constraints turned this covering project into a real challenge, one taken up by all intervening parties to the great satisfaction of the many users.
