ACI CODE-562-21: Assessment, Repair, and Rehabilitation of Existing Concrete Structures - Code and Commentary

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Description

ACI CODE-562-21, “Assessment, Repair and Rehabilitation of Existing Concrete Structures—Code Requirements and Commentary,” was developed to provide design professionals a code for the assessment of the damage and deterioration, and the design of appropriate repair and rehabilitation strategies. The Code provides minimum requirements for assessment, repair, and rehabilitation of existing structural concrete buildings, members, systems and, where applicable, nonbuilding structures. ACI CODE-562-21 was specifically developed to work with the International Existing Building Code (IEBC) or to be adopted as a stand-alone code.

Keywords:

assessment; bond; corrosion; damage; durability; evaluation; existing structure; fiber-reinforced polymer (FRP); interface bond; licensed design professional; maintenance; rehabilitation; reliability; repair; strengthening.

 

Document Details

Author: ACI Committee 562

Publication Year: 2021

Pages: 88

Formats: Printed Document or Protected PDF/Web View

Table of Contents

PREFACE, p. 3

CHAPTER 1—GENERAL REQUIREMENTS, p. 5

1.1—Scope, p. 5

1.2—General, p. 5

1.3—Purpose, p. 5

1.4—Applicability of this Code, p. 5

1.5—Administration, p. 7

1.6—Design and construction documents, p. 8

1.7—Assessment, design, and construction requirements if used with an existing building code, p. 9

1.8—Assessment, design, and construction requirements if not used with an existing building code , p. 11

CHAPTER 2—NOTATION AND DEFINITIONS, p. 14

2.1—Notation, p. 14

2.2—Definitions, p. 15

CHAPTER 3—REFERENCED STANDARDS, p. 21

CHAPTER 4—CRITERIA AS A STAND-ALONE CODE FOR ASSESSMENT, REPAIR, AND REHABILITATION OF EXISTING STRUCTURES, p. 23

4.1—General, p. 23

4.2—Criteria for the assessment, repair, and rehabilitation design of existing concrete structures, p. 23

4.3—Potentially dangerous structural conditions, p. 24

4.4—Substantial structural damage, p. 25

4.5—Conditions of deterioration, faulty construction, or damage less than substantial structural damage with strengthening, p. 27

4.6—Conditions of deterioration, faulty construction, or damage less than substantial structural damage without strengthening, p. 29

4.7—Additions, p. 29

4.8—Alterations, p. 30

4.9—Change of occupancy or use, p. 31

CHAPTER 5—LOADS, FACTORED LOAD COMBINATIONS, AND STRENGTH REDUCTION FACTORS, p. 32

5.1—General, p. 32

5.2—Load factors and load combinations, p. 32

5.3—Strength reduction factors for rehabilitation design, p. 33

5.4—Strength reduction factors for assessment, p. 33

5.5—Additional load combinations for structures rehabilitated with external reinforcing systems, p. 34

CHAPTER 6—ASSESSMENT, EVALUATION, AND ANALYSIS, p. 37

6.1—Structural assessment, p. 37

6.2—Investigation and structural evaluation, p. 37

6.3—Material properties, p. 38

6.4—Test methods to quantify material and member properties, p. 40

6.5—Structural analysis of existing structures, p. 44

6.6—Structural serviceability, p. 45

6.7—Structural analysis for repair design, p. 45

6.8—Strength evaluation by load testing, p. 46

CHAPTER 7—DESIGN OF STRUCTURAL REPAIRS, p. 48

7.1—General, p. 48

7.2—Strength and serviceability, p. 48

7.3—Behavior of repaired systems, p. 48

7.4—Interface bond of cementitious repair materials, p. 49

7.5—Materials, p. 52

7.6—Design and detailing considerations, p. 53

7.7—Repair using supplemental post-tensioning, p. 57

7.8—Repair using fiber-reinforced polymer (FRP) composites, p. 58

7.9—Performance under fire and elevated temperatures, p. 59

CHAPTER 8—DURABILITY, p. 62

8.1—General, p. 62

8.2—Cover, p. 64

8.3—Cracks, p. 64

8.4—Corrosion and deterioration of reinforcement and metallic embedments, p. 66

8.5—Surface treatments and coatings, p. 68

CHAPTER 9—CONSTRUCTION, p. 69

9.1—General, p. 69

9.2—Stability and temporary shoring requirements, p. 69

9.3—Temporary conditions, p. 71

9.4—Environmental issues, p. 71

CHAPTER 10—QUALITY ASSURANCE, p. 72

10.1—General, p. 72

10.2—Inspection, p. 72

10.3—Testing of repair materials, p. 74

10.4—Construction observations, p. 75

CHAPTER 11—COMMENTARY REFERENCES, p. 76

Authored documents, p. 81

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