Sr.No. | Pre-Tensioning | Post-Tensioning |
1 | Pre-tensioning is done in the factories thus suitable for precast construction works | Post-tensioning can be done in factories as well as on the site |
2 | In 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. |
3 | Small sections are to be constructed | Size of a member is not restricted, long-span bridges are constructed by post-tensioning |
4 | Loss of prestressing isn't less (about 18 %) | Loss of prestressing isn't more (about 15 %) |
5 | In this method, similar prestressed members are prepared. | In this method, products are changed according to a structure. |
6 | Pre-tensioning members are produced in a mould. | Cables are used in place of wires and jacks are used for stretching. |
7 | 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. |
8 | This method is developed due to the bonding between the concrete and steel tendons. | This method is developed due to bearing. |
9 | Pre-tensioning is preferred when the structural element is small and easy to transport. | Post-tensioning is preferred when the structural element is heavy. |
10 | It is cheaper because the cost of sheathing is not involved | It is costlier because of use of sheathing |
11 | It is more reliable and durable | The durability depends upon the two anchorage mechanism |
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