Working Sequence

The Post Tensioning Working Sequence can be broken down into laying, stressing and grouting as depicted in the below image:



  • Completion of formwork as per shop drawing.
  • Check level difference; pour strip location, slab thickness and drop panel depth before erection of bottom reinforcement.
  • Completion of bottom reinforcement with appropriate Dia of bar and with equal spacing.
  • Fixing the block out to casting and wrapping it with OPP tape.
  • Marking of tendon in both live and dead end with marker.
  • Anchorage should be fixed to the mark at end form work by supporting bars.
  • Laying of GI duct is under progress.
  • Fixing of duct to end anchorage with the help of vent coupler and it should be wrapped with OPP tape to avoid entry of foreign particles.
  • De – coiling of HT Strand and cutting the strand for required size of the tendon.
  • Inserting the strands to the duct.
  • Check C.G of the casting.
  • Bursting reinforcement should be fixed to position at end anchorage.
  • Profile chair should be fixed to the tendon as per shop drawing.
  • Fixing of grout hose in both live and dead end. If the span is more than 35m intermediate vent hose should be provided.
  • Proper packing of casting to avoid entry of foreign particle.
  • Pouring of concrete (M-45 Grade).
  • Proper vibration of the member @ face of the anchorage.


  • Concrete should attain minimum strength of 28N/mm2
  • Removal of block out.
  • Fixing of wedge Plate and wedges.
  • 25% of initial load for slack removal.
  • Mark each strand with help of the marker

Flat Tendon

  • Stress the strand for final loading as per stressing calculation report.
  • Ensure Protruding strand length is sufficient for stressing (350 – 400mm)
  • Stress of tendon is done by (T-25 Jack) as it can stress only one strand at a time.
  • Elongation for each strand should be checked after 24hrs.

Multi Tendon

  • Multi jack should be hoisted with chain pulley.
  • All strands should be inserted to jack guide pipe.
  •  Ensure the strand is locked to jack pulling head.
  • 25% of initial load for slack removal.
  •  Record the strand elongation for every incremental of 10 Mpa.
  •  Release the pressure when the jack has reached desired load.