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Tower will be 'bomb proof '

MATERIALS

STEEL and concrete will feature heavily at the new Freedom Tower development at ground zero, the former site of the Twin Towers in New York destroyed by terrorist attacks.

Unveiling the latest redesign of the tower after the Police Department rejected the original, architect David Childs revealed that the building would be built with a steel frame and reinforced concrete core shear wall.

The main structure is to sit on a 60 mhigh concrete and steel base designed to withstand a blast from a truck bomb.

Extra-strong fireproofing will feature in the final tower as well as wide emergency stairs, firefighting stairs and 'areas of refuge'on each floor.These will be encased in 1 m-thick walls.