M25 - M40 can be used..
The current (1973) bridge is a pre-stressed concrete box girder bridge
iron, steel, concrete, stone, wood, and composites are the most common materials used in bridge construction!
Go to the Link Below (History of the Sydney Harbour Bridge) for a brief description of the bridge and the technology employed in its construction and design>
There was virtually no wire used in the construction of Tower Bridge. Its main components are 70,000 tons of concrete, 11,000 tons of steel and it is clad in Cornish granite and Portland stone.
What is mixing ratio for concrete grade 30
The "Richmond Bridge" London, England. The design is a stone arch bridge constructed of Portland stone, construction started 1774 and completed 1777.The "Richmond Bridge" Richmond, Tasmania. The original name was "Bigge's Bridge and was constructed of sandstone, construction started in 1823 and completed in 1825.
M20 refers to the grade of the concrete generally used in construction purpose. Here, M refers to mix & number 20 refers to the characteristic strength of concrete. the proportions of this grade is (1:1 1/2: 3). Along with this there are some more grades used in constructions i.e., M5, M7.5, M10, M15, M25, M30................. M80
Concrete is sold in cubic (volume) measurements not square (area) measurements.
The current London Bridge is a pre-stressed concrete box girder bridge.
The present London Bridge is built using pre-stressed concrete.
The volume of concrete used to build the Millau bridge is 85,000 m3 (cubic meters). The weight of this volume of concrete is 206,000 metric tons.
The present bridge is a pre-stressed concrete box girder bridge.