Review Session for Post-Tensioning Installers and Inspectors. This is not might to be a training course for certification.

1. POST TENSIONING
Review Session

2. Review Session
Objective: Performance through product quality, as
well as effective installation, supervision and inspection
to achieve a successful completion of a project.
Note: This review session will not replace the training
that an installation/ inspection agency receives.
AMSYSCO, Inc. is not responsible for the training of the
installation crew or individual associated with the field
installation of the post tensioning material.

3. I. Change in ACI Code
• To use an encapsulated system at all locations
on a commercial structure.

4. II. Upgrade of AMSYSCO’s Encapsulated System
• No grease at “dead ends” and stressing ends
• Grease to be filled in sleeves of intermediate
anchors
• Plastic sheathing remains intact within the
extended sleeve of the anchor
– Field labor savings

5. III. Post Tensioning Field Operations
A. Storage & Handling
• Store PT bundles off ground
• Cover with tarp
• If bundle is shrink wrapped, punch holes in
wrapping to allow air circulation
• Use nylon slings for handling
• Do not drag by “dead end”
• All material (PT tendons, anchors, wedges) to be
stored in dry environment
• Mill certification
• Calibration chart of stressing equipment

6. III. Post Tensioning Field Operations
B. Installation
• Attach stressing anchors and intermediate
anchors to bulkhead
• Position of anchor with regards to bulkhead
• Tendons installed in a curve
• Anchor/ pocket former
• Pocket former and grease – What type of
grease
• Use WD-40

7. Installation (cont.)
• Overlapping anchors
• Reverse curvature
• Position of support and backup bars
• Wobble
• Standard friction loss
• Can tendon be moved vertically or horizontally?
• Can anchor (position) be moved vertically or
horizontally?

8. III. Post Tensioning Field Operations
C. Stressing
• Wedge orientation
• Gage pressure – What does it mean?
• Position of stressing jack
• Location and positioning of pump
• Eye contact by pump operator
• One-way stressing
• Two-way stressing
• Multiple pulls (stressing) on the same tendon

9. Stressing (cont.)
• Paint marking (benchmark)
• Scale and guide for paint marker
• Measurement of elongation
• Recording of elongation
• Recording of gage pressure
• Recording notes in the Elongation Report

10. Stressing (cont.)
• Elongation tolerances
• Under elongation
• Over elongation
• Instant comparison of field elongations vs.
mathematical elongations
• Decision making if there is deviation and
resultant action
• Submitting elongation report to the Structural
Engineer of Record

11. III. Post Tensioning Field Operations
D. Stressing Equipment
• Keep equipment dry at all times
• Service and maintenance of the stressing
equipment
• Calibration chart
• Safety
• Log of service by the operator or contractor’s
appointed person

12. III. Post Tensioning Field Operations
E. Miscellaneous
• Hairline cracks in wedges
• Strand break
– Why strand can break at a lower pressure/ force below the
ultimate breaking level
• Unraveled strand
• Kink in strand
• Length of electric cord from stressing pump
• Stressing equipment and rain
• Lift off
• Detensioning
• When to detension
• Overstressing (5%)