All the buildings at the World Trade Center site in New York City are composite structures designed for blast resistance. Note the concrete being used to protect the perimeter steel columns.
Peter Rodrigues (left) and his father Tony represent the current generations of Roger & Sons, the concrete contractor for 4WTC.
Roger & Sons worked with the formwork supplier to design and develop the complicated core forming system.
These #18 reinforcing bars surrounding structural steel columns are part of the blast resistance of the building.
Located in the wilderness of northern Minnesota the NOvA project building is buried in foundation rock layer. The formed on one side walls vary from 18 inches to 30 feet
The NOvA building is buried in bedrock. The concrete behind the one-sided forms varied from 18 in. to 25 ft. wide.