Different Between Pre Tensioning And Post Tensioning Concrete Structure

Different between pre-tensioning and post-tensioning members

These methods are used under the pre-stressing process which has few edges over the orthodox non-stressed structures like greater span to depth ratio, higher moment, and shear capacity. These methods are generally adopted in the making of PSC girders, sleepers, etc.

S.N	Pre-tensioning	post-tensioning
1	In this method, the concrete is prestressed with tendons before it is placing in position.	In this method prestressing is done after the concrete attains sufficient strength.
2	This method is developed due to the bonding between the concrete and steel tendons.	This method is developed due to bearing.
3	Pre-tensioning is preferred when the structure element is small and easy to transport.	Post-tensioning is preferred when the structure element is heavy.
4	In this method, similar prestressed members are prepared.	In this method, products are changed according to the structure.
5	Prestressed members are produced in mould and then transported.	Cables are used in place of wire and jacks are used for stretching.
6	Its size is limited.	Its size is not limited.
7	It is cheaper to construct.	It is costlier.
8	It is more durable.	It depends on their construction mechanism.
9	In this process, Members are tensioned at first and then cast.	In this process, Members are cast first and then tensioned.
10	Culverts, girders are constructed.	Long bridge, buildings with long-span beam are constructed.