423.4R-14 Report on Corrosion and Repair of Unbonded Single-Strand Tendons

423.4R-14 Report on Corrosion and Repair of Unbonded Single-Strand Tendons

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Description

This report gives general information regarding evaluating corrosion damage in structures reinforced with unbonded single-strand post-tensioning tendons. Historical development of those parts of the building code dealing with durability and corrosion protection is explained. Evolution of the types and components of unbonded tendons is described. Specific aspects of corrosion in unbonded single-strand tendons are described, and common problems in structures reinforced with these tendons are discussed. Methods are presented for repairing, replacing, and supplementing tendons.

Keywords: allowable stresses; anchorage; carbonation; concrete construction; corrosion; corrosion protection; cover; durability; embrittlement; external post tensioning; post-tensioned concrete; prestressed concrete; sheathing; single-strand tendons; unbonded post-tensioning

 

Document Details

Author: ACI Committee 423

Publication Year: 2014

Pages: 22.00

ISBN: 9780870319532

Categories: Prestressed Concrete

Formats: Printed Document, PDF, or Kindle

Table of Contents

CHAPTER 1--INTRODUCTION

1.1—General

1.2—Background

1.3—Scope

1.4—Limitations

CHAPTER 2—DEFINITIONS

2.1—Definitions

CHAPTER 3—REVIEW OF CODE REQUIREMENTS

AND CHANGES

3.1—General

3.2—Cover requirements for unbonded tendons

3.3—Allowable tensile stresses in concrete

3.4—Protection of unbonded tendons

CHAPTER 4—UNBONDED TENDONS

4.1—Historical development of unbonded tendons

4.2—Sheathing problems

4.3—Detailing practices

4.4—Storage, handling, and construction problems

4.5—Deterioration mechanisms

4.6—Performance record

CHAPTER 5—CONDITION ASSESSMENT AND TESTING

5.1—General

5.2—Condition surveys of concrete

5.3—Condition surveys of tendons

5.4—Nondestructive testing

5.5—Exploratory openings

5.6—Strand removal

5.7—Other testing and investigative procedures

CHAPTER 6—REPAIR METHODS

6.1—General

6.2—Tendons with observable corrosion

6.3—Spliced repair of strand

6.4—Strand replacement

6.5—Tendon replacement

6.6—External post-tensioning

6.7—Continuous acoustic monitoring

6.8—External nonprestressed reinforcement or support

6.9—Total demolition and replacement

CHAPTER 7—SUMMARY

CHAPTER 8—REFERENCES

Authored documents

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