The Mackenzie River Bridge is part of the new TransCanada Highway realignment near Thunder Bay, Ontario, Canada. The project consists of twin, two-lane bridges; each consisting of three-spans for a total length of 180 m. The bridge crosses a deep gorge of the Mackenzie River using variable depth continuous steel plate girders with full-depth precast deck panels that are lightly prestressed and run the full-width of the bridge.
There are 130 precast deck panels, 2.99 m wide x 14.5 m long x 225 mm thick. The transverse joints between the panels are filled with Ductal® field-cast as well as the shear pockets and haunches between deck panels and the steel girders. The project also used precast approach slabs with Ductal® field-cast connections.
This is the largest field-cast Ductal® project to date in North America. Lafarge supplied twin 0.5 m3 Ryan mixers, providing over 20 m3 per day of production for a total of 175 m3. The casting of the joint fill material was completed with an 18-man crew which consisted of two men on the mixers, one man on the scales, one loader operator to load the mixers, one man to guide the loader, two men on power buggies transporting the material from the mixer to the bridge, four men guiding the buggies, one man floating the material and six men on the forms. It took the crew ten days to cast the 175 m3 required for the project.