Concrete is a material who has the power high to the press, but otherwise has very low relative strength of the attraction. Concrete not always work effectively in cross-section of reinforced concrete structures, only the pressure that will be effective at work, while part of the cracked concrete section are not interested to work effectively and simply represents dead weight that is not useful.
This has led to failure by not invented reinforced concrete structures with long span economically, because too much dead weight that is not effective. In addition, the cracks around the steel bars can be dangerous for the structure because it is the place seep into the water and outside air resulting in rusted steel bars. Rusted reinforcing steel rupture due to fatal consequences for the structure.
With the perceived shortcomings of reinforced concrete structures as described above, arises the idea of using combinations of concrete materials differently, namely by providing pratekanan on concrete through steel cables (tendons) are withdrawn or referred prestressed concrete .
first prestressed concrete found by EUGENE FREYSSINET , a French engineer < / strong>. He argued that to cope with the creep, relaxation and slip on the anchor wire or cable is used in concrete and steel of high quality. In addition he has also created a system of long wires and system withdrawal good, which is still used and popular with system FREYSSINET .
Therefore, Freyssinet has successfully create , a new structure type as a rival of reinforced concrete structures. Because the cross section of concrete had no interest, then the whole load can be fully and with this system dimungkinkanlah creation slender structures and landscape-long span.
Prestressed concrete for the first time conducted a massive by Freyssinet successfully in 1933 at the Gare Maritime port LeHavre (France). Freyssenet as the father of prestressed concrete soon followed in his footsteps by other experts in developing further this type of structure.