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Which of the following pre - stressing system is employed in manufacturing concrete sleepers for railways?
1. Post - tensioning
2. Partial pre-stressing
3. Pre-tensionng
4. Pre-tensioning followed by post-tensioning
5. Post-tensioning with accelerated curing

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Correct Answer - Option 3 : Pre-tensionng

Explanation:

  • Prestressing system: two type
    • Pre tensioning
    • Post-tensioning

Pre tensioning:

  • n the case of pre-tensioning, the prestressing cables also called as strands are tensioned before casting the concrete. Latter concrete is cast enclosing the tensioned cables, so in this method, we can say first tensioning and then casting.
  • Mostly pre-tensioning is done in factories hence it is suitable for precast construction works.
  • Pre tensioning system is used in the manufacturing of railways sleepers.
  • In the case of pre-tensioning, the size of the sections is limited due to transportation restrictions and also due to the availability of cranes capable of lifting the sections into place.
  • pre-tensioning is more reliable and durable as compared to post-tensioning.

Post-tensioning:

  • In the case of post-tensioning, the strands are enclosed within a duct and then concrete is cast. The process of tensioning the strands is carried out after the concrete attains its sufficient strength so in this method we can say first casting and then tensioning.
  • Post-tensioning can be done in factories as well as on-site.
  • In the case of post-tensioning, the size of the member is not restricted long-span bridges can be constructed with the help of this method.

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