Difference Between Pre-Tensioning and Post-Tensioning | What Is Prestressed | Methods of Prestress

What Is Prestressed?

Methods of Prestress

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Internal Prestressing

  1. Pre-tensioning
  2. Post-tensioning
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External Prestressing

  • This method is not commonly used.
  • In this method, the prestressing is done by adjusting the external reactions (by introducing different support conditions).
  • In as per below fig, simply supported beam is prestressed externally by jacks.
  • The externally prestressing system requires very much accuracy in planning and application.
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1. Pre-Tensioning

2. Post-Tensioning

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Difference Between Pre-Tensioning and Post-Tensioning

Sr.No.Pre-TensioningPost-Tensioning
1Pre-tensioning is done in the factories thus suitable for precast construction worksPost-tensioning can be done in factories as well as on the site
2In this type of concrete, the pre-stressing cables called the strands are tensioned before casting the concrete and then concrete is casted enclosing the tensioned cables.In this type of concrete, the strands are enclosed within a duct in the form and then concrete is casted. The process of tensioning the strands is carried out after the concrete attains its sufficient strength.
3Small sections are to be constructedSize of a member is not restricted, long-span bridges are constructed by post-tensioning
4Loss of prestressing isn't less (about 18 %)Loss of prestressing isn't more (about 15 %)
5In this method, similar prestressed members are prepared.In this method, products are changed according to a structure.
6Pre-tensioning members are produced in a mould.Cables are used in place of wires and jacks are used for stretching.
7In this method, the concrete is prestressed with tendons before it is placing in positionIn this method prestressing is done after the concrete attains sufficient strength.
8This method is developed due to the bonding between the concrete and steel tendons.This method is developed due to bearing.
9Pre-tensioning is preferred when the structural element is small and easy to transport.Post-tensioning is preferred when the structural element is heavy.
10It is cheaper because the cost of sheathing is not involvedIt is costlier because of use of sheathing
11It is more reliable and durableThe durability depends upon the two anchorage mechanism
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What Is Pre Tensioning?

Pre Tensioning

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What Is Post Tensioning Concrete?

What Is Pre and Post Tensioning?

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Pre Tensioning and Post Tensioning

What Is Post Tensioning in Concrete?

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Post Tensioning Concrete

Post Tension Vs Conventional

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Pretensioned and Post Tensioned Concrete

What Is the Difference Between Pre Tensioning and Post Tensioning?

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How Pre-Tensioning Is Done?

What Are the Methods of Post-Tensioning?

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  1. Freyssinet System.
  2. Magnel System.
  3. Leonhardt System.
  4. Lee-Mccall System.
  5. Gifford-Udall System.
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Difference Between Pre Tensioning and Post Tensioning

Difference Between Pretension and Post Tension

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Pretensioning and Post Tensioning

Pre Tension Slab

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Difference Between Post Tensioning and Pre Tensioning

Pre Tensioning System

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Post Tension Vs Pre Tension

Post Tensioning and Pre Tensioning

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Methods of Prestressing

  • Pre-tensioning Method.
  • Post-tensioning Method.
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