Concrete was invented by the Romans and so was the arch, so for thousands of years it has been around. A good example of use of the arch and concrete are the aqua ducts.
It is a pre-stressed concrete box girder bridge.
The present bridge is a pre-stressed concrete box girder bridge.
Lions Gate Bridge is made of steel and concrete.
The Skye Bridge is constructed of concrete and steel.
concrete
The basic matetrials were steel and concrete.
The current London Bridge is a pre-stressed concrete box girder bridge.
The ANZAC Bridge in Sydney is made of structural steel, steel cable and concrete
Steel and concrete.
The present London Bridge is a pre-stressed concrete box girder bridge.
It is made of steel and concrete.
The current bridge is made of pre-stressed concrete.