Which of the following is a disadvantage in the case of Freyssinet system of post tensioning?

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DFCCIL Executive Civil Official Paper (Held On: 10 Nov, 2018 Shift 2)
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  1. Projection of plug left in concrete
  2. Safeguarding of wires is economical
  3. Stresses in the wires are not similar
  4. Rapid attainment of stretching force

Answer (Detailed Solution Below)

Option 3 : Stresses in the wires are not similar
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Concept:

Advantages of the Freyssinet system:

  • Securing wires is not an expensive process.
  • The required force for stretching the wires can be obtained very quickly.
  • The plugs if placed in the concrete then it do not project beyond the ends of the member.


Disadvantage of the Freyssinet  system:

  • All the wires of cable should be stretched together in this system and therefore the stresses in the wires developed may not be exactly the same.
  • The greatest stretching force which is applied in the range of 250 kN to 500 kN and this may not sufficient in many cases.
  • The jack arrangements used in the system are very heavy and expensive, therefore practical difficulties are associated with it.
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