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Post Tensioning – Process



*  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-35 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


*  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 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.


*  Mix the grout as per grout mix.
*  The mix is prepared with W/C ratio of 0.4 – 0.45 as per site condition with additive of 0.2% (Weight of the cement).
*  Inject the grout from tendon inlet hose.
*  As the grout flows out of the intermediate vent, lock these vents in the direction of grout.
*  Lock the outlet hose when the grout flows out.
*  Check the grout pumped out has the same consistency as its pumped in.
*  Lock the inlet hose when the required pressure is achieved (3-5 bars).

Construction sequence

Bottom shuttering in

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Completion of Bottom shuttering

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Tying of Bottom Nominal reinforcements

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Completion of Bottom Nominal reinforcements

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GI Ducts Laying in Progress

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Fixing of ducts at end stressing anchorages

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Stressing end Anchorages fixed at Edge RCC Beams

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De coiling of HT strands

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Inserting of HT strands into GI Ducts

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Fixing of bar chairs to form tendon profile

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Stressing end anchorage, grout vents on completion of laying

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Bursting links at Stressing anchorages

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Fixing of Dead ends and Fixing of grout vent

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Laying of Tendons on completion

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Pour strip provided for construction feasibility

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PT MaterialsImage 22

Aerial view of Tendons Laying before concreting

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PT Flat slab after completion of Tendon laying ,before concreting

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One way PT beam and slab : on Tendon laying completion

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PT Tendon Laying in Beam

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Concreting In Progress

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Fixing of anchor Blocks and wedges .

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25 % of initial stressing to remove slag.

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Stressing Of Slab Tendons. Paint Mark shows Elongation

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Paint Mark shows Elongation

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Anchorages seen after stressing in edge beams

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Excess strand has been cut after stressing

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Patching of stressing Pockets

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Adding cement in to the mixing tank

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Mixing of Cementicious Grout

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Closing of Grout hose end .

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