ACI PRC-549.4-20: Guide to Design and Construction of Externally Bonded Fabric-Reinforced and Steel-Reinforced Grout Systems for Repair and Strengthening of Concrete Structures

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Description

Fabric-reinforced cementitious matrix (FRCM) and steel-reinforced grout (SRG) systems for rehabilitation and strengthening concrete structures is an alternative to traditional techniques such as fiber-reinforced polymers (FRPs), steel plate bonding, section enlargement, and external post-tensioning. An FRCM/SRG is a composite material consisting of one or more layers of inorganic matrix reinforced with dry fibers in the form of open mesh or fabric. The inorganic matrixes are typically cement-based, lime-based, or geopolymer. When adhered to concrete structural members, they form an FRCM/SRG system that acts as supplemental, externally bonded reinforcement. This guide addresses the history and use of FRCM and SRG systems rehabilitation and strengthening, their unique material properties, and recommendations on their design, construction, and inspection. Guidelines are based on experimental research, analytical work, and field applications.

Keywords:

cyclic loading; deflection; earthquake-resistant; fabric-reinforced cementitious matrix fatigue systems; fiber-reinforced polymer systems; lap splices; meshes; substrate repair; rehabilitation; surface preparation.

Document Details

Author: ACI Committee 549

Pages: 36

ISBN: 9781641950985

Categories: Bonded, Fiber-Reinforced Concrete, Post Tensioning, Reinforcement

Formats: PDF

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE, p. 2

1.1—Introduction, p. 2

1.2—Scope, p. 2

CHAPTER 2—NOTATION AND DEFINITIONS, p. 2

2.1—Notation, p. 2

2.2—Definitions, p. 3

CHAPTER 3—BACKGROUND, p. 4

3.1—FRCM and SRG systems features, p. 4

3.2—Background, p. 4

3.3—Commercially available FRCM/SRG systems, p. 12

CHAPTER 4—FIELD APPLICATION EXAMPLES, p. 12

4.1—Concrete repair applications, p. 13

CHAPTER 5—FRCM AND SRG CONSTITUENT MATERIALS AND SYSTEM QUALIFICATIONS, p. 16

5.1—Constituent materials, p. 16

5.2—FRCM and SRG system qualifications, p. 17

5.3—Physical and mechanical properties of FRCM/SRG, p. 17

5.4—Durability, p. 18

CHAPTER 6—SHIPPING, STORAGE, AND HANDLING, p. 18

6.1—Shipping, p. 18

6.2—Storage, p. 18

6.3—Handling, p. 18

CHAPTER 7—INSTALLATION, p. 19

7.1—Contractor qualifications, p. 19

7.2—Environmental considerations, p. 19

7.3—Equipment, p. 19

7.4—Substrate repair and surface preparation, p. 19

7.5—Mixing of mortar matrix, p. 20

7.6—Application of FRCM/SRG systems, p. 20

7.7—Alignment of FRCM/SRG reinforcement, p. 20

7.8—Multiple fabrics and lap splices, p. 20

7.9—Curing of mortar matrix, p. 20

7.10—Temporary protection, p. 20

CHAPTER 8—INSPECTION, EVALUATION, AND ACCEPTANCE, p. 20

8.1—Inspection, p. 20

8.2—Evaluation and acceptance, p. 21

CHAPTER 9—MAINTENANCE AND REPAIR, p. 22

9.1—General, p. 22

9.2—Inspection and assessment, p. 22

9.3—Repair of strengthening system, p. 22

9.4—Repair of surface coating, p. 22

CHAPTER 10—GENERAL DESIGN CONSIDERATIONS FOR REINFORCED CONCRETE STRENGTHENED WITH FRCM/SRG, p. 22

10.1—Design philosophy, p. 22

10.2—Strengthening limits, p. 22

10.3—Selection of FRCM/SRG system, p. 22

10.4—Design properties, p. 22

CHAPTER 11—FRCM/SRG REINFORCEMENT DETAILS, p. 22

11.1—Bond and delamination, p. 23

CHAPTER 12—STRENGTHENING OF REINFORCED CONCRETE MEMBERS WITH FRCM/SRG, p. 23

12.1—FRCM/SRG flexural strengthening, p. 23

12.2—Shear strengthening, p. 24

12.3—Strengthening for axial force, p. 25

12.4—Design axial strength, p. 27

12.5—Engineering requirements, p. 27

12.6—Drawings and specifications, p. 27

12.7—Submittals, p. 27

CHAPTER 13—REFERENCES, p. 27

Authored documents, p. 28

APPENDIX A—CONSTITUENT MATERIALS PROPERTIES OF COMMERCIALLY AVAILABLE FRCM SYSTEMS, p. 34

APPENDIX B—DESIGN LIMITATIONS, p. 36

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