Difference between pre tensioning and post tensioning

v  Pre Tensioning Vs Post Tensioning:-Pre-tensioning and post-tensioning are both methods of pre stressing concrete, which involves reinforcing concrete with steel tendons.

 

ü Pre tensioning vs post tensioning

When tendons are tensioned before concretes    are poured is called pre tensioning.	When tendons are tensioned after concretes are hardened is called post tensioning.
It is good for precast construction.	It is good for long span and high structural efficiency.
Steel is mostly stay horizontal.	Steel wires can be placed any desired profile.

§  Work Function:-

1)     In pre tensioning steel tendons are stressed before concrete is poured around them.

 

2)     In post tensioning the steel tendons are inserted in void in cured concrete using jacks.the jacks are replaced with permanent anchorages.

 

o   Benefits

1)      Both methods improve the tensile strength of concrete and put it in compression.

 

2)      Post-tensioning can allow for thinner, more flexible structures.

·        Uses

1)      Pre-tensioned concrete is often used for structural beams, floor slabs, water tanks, and concrete Pipes.

2)       Post-tensioned concrete is often used for large spans and heavily loaded structures.