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M10.2-24: Specification for Unbonded Single Strand Tendons

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Description

This updated publication presents performance specifications for single-strand unbonded post-tensioning tendons in prestressed concrete structures. Specifications are given for encapsulated tendons used in all structures designed using ACI 318 and SOG applications in aggressive environments. Revisions include testing requirements of sheathing restraint encapuslation systems and general enhanced provisions for corrosion protection of unbonded tendons.

Published December 2024

32 pages

 

Table of Contents

SECTION 1—GENERAL REQUIREMENTS

1.1—Scope

1.1.1—Work specified

1.1.2—Work not specified

1.2—Definitions

1.3—References

1.3.1—Referenced standards and organizations

1.3.2—Cited references

1.4—System description

1.5—Submittals

1.5.1—Prestressing steel

1.5.2—Anchorages and couplers

1.5.3—Sheathing

1.5.4—PT coating

1.5.5—Fabrication plant certification

1.5.6—Stressing jack calibration

1.5.7—Stressing records

1.6—Fabrication

1.6.1—General

1.6.1.1—PTI Certified Plants

1.6.1.2—Non-PTI Certified Plants

1.6.2—Handling, storage, and shipping

1.6.2.1—Handling prior to shipping

1.6.2.2—Storage prior to shipping

1.6.2.3—Shipping

1.7—Delivery, handling, and storage

1.7.1—Delivery

1.7.2—Handling and storage

1.7.2.1—Handling

1.7.2.2—Storage

1.7.2.3—Exposure

1.7.2.4—Wedges and anchors

SECTION 2—PRODUCTS

2.1—Prestressing steel

2.1.1—Mechanical properties

2.1.2—Thermomechanical treatment

2.1.3—Traceability

2.1.4—Testing

2.1.5—Strand producer records

2.1.6—Identification

2.1.7—Packaging, marking, storage, and protection

2.1.8—Acceptance criteria for surface condition

2.1.9—Compliance requirements

2.2—PT coating

2.2.1—PT coating

2.2.2—Tests

2.2.3—Minimum quantity

2.2.4—Shipping and handling

2.3—Sheathing

2.3.1—Sheathing

2.3.2—Thickness

2.3.3—Inside diameter

2.3.4—Appearance

2.3.5—Fabrication processes

2.3.6—Sheathing coverage

2.3.7—Alternate material

2.4—Anchorages and couplers

2.4.1—Anchorages

2.4.1.1—Anchorage-to-sheathing connection

2.4.1.2—Bearing stresses

2.4.2—Castings

2.4.3—Couplers

2.4.3.1—Coupler enclosure

2.4.3.2—Tape

2.4.3.3—Assembly instructions

2.5—Anchorage assembly testing

2.5.1—Validation

2.5.2—Wedges

2.5.2.1—Wedge design

2.5.2.2—Wedge quality control

2.5.3—Components

2.5.4—Strength test

2.5.5—Ductility test

2.5.6—Static test

2.5.7—Fatigue test

2.6—Encapsulation testing

2.6.1—Sheathing restraint tests

2.6.1.1—Sheathing restraint static load test

2.6.1.2—Sheathing restraint sustained load test

2.6.2—Hydrostatic test

2.6.2.1—Encapsulation system using sheathing overlap connection

2.6.2.2—Encapsulation system using sheathing restraint connection

2.6.2.3—Acceptance criteria

2.7—Alternative materials

SECTION 3—EXECUTION

3.1—Installation procedures

3.2—Installer certification

3.3—Inspection

3.4—Delivery

3.5—Handling

3.6—Protection

3.7—Tendon installation

3.7.1—Support intervals

3.7.2—Support system

3.7.3—Protection

3.7.4—Protection from water

3.7.5—Stressing anchorages

3.7.5.1—Placement

3.7.5.2—Attachment requirements

3.7.5.3—Installation

3.7.5.4—Cover requirements

3.7.5.5—Pocket formers

3.7.5.6—Encapsulation

3.7.5.7—Encapsulation cap cover

3.7.6—Intermediate anchorages

3.7.6.1—Placement

3.7.6.2—Installation

3.7.6.3—Cover requirements

3.7.6.4—Pocket formers

3.7.6.5—Encapsulation

3.7.7—Fixed anchorages

3.7.7.1—Attachment

3.7.7.2—Wedge seating methods for fixed anchorages

3.7.7.3—Placement

3.7.7.4—Encapsulation

3.7.8—Sheathing inspection and repair

3.7.8.1—Sheathing damage

3.7.8.2—Repair procedure

3.8—Tendon tolerances

3.8.1—General

3.8.2—Profile tolerances

3.8.3—Lateral deviations

3.9—Concrete placement

3.9.1—General

3.9.2—Placement

3.9.3—Protection of tendons

3.9.4—Sheathing repairs

3.10—Tendon stressing

3.10.1—General

3.10.2—Protection from water

3.10.3—Stressing jacks

3.10.4—Jack calibrations

3.10.5—Elongation measurements

3.11—Tendon finishing

3.11.1—Cutting of tendon tails

3.11.2—Cutting methods

3.11.3—Encapsulation

3.12—Stressing pockets

3.12.1—Preparation

3.12.2—Timing

APPENDIX A—ISO VISCOSITY GRADES FOR INDUSTRIAL OILS

ADDENDA AND ERRATA INFO

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