On April 26, general contractor Suffolk Construction managed the largest continuous concrete mat placement in the city of Boston's history at the downtown Millennium Tower development.
Hudson, Mass.-based subcontractor S&F Concrete marshalled 600 concrete trucks to cast 6,000 cu yd of concrete for the foundation of the $700-million building. The continuous cast lasted 36 hours, starting at 4:00 a.m. The foundation's 8-ksi-concrete mat averages 6½ ft in depth.
It cost $6 million to put in place, including both the concrete and reinforcing bar. The mat will support a 625-ft-tall building with 1.4 million sq ft of space.