Pre-tensioning and Post-tensioning both methods are used under 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.

pre – tensioning

1- In this method the concrete is prestressed with tendons before it is placing in position.

2- This method is developed due to bonding between the concrete and steel tendons .

3- Pre tensioning is preferred when the structural element is small and easy to transported.

4- In this method similar prestressed members are prepared .

5- Pre-tensioning members are produced in mould.

post – tensioning

1- In this method prestressing is done after the concrete attains it’s strength

2- This method is developed due to bearing

3- Post tensioning is preferred when the structural element is heavy

4- In this method products are changed according to structure .

5- Cables are used in place of wires and jacks are used for stretching.

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