An ACI Provisional Standard Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures and Commentary Reported by ACI Committee 562 ACI 562-16 ACI First Printing ISBN: 978-0-87031-000-0 Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures and Commentary Copyright by the American Concrete Institute, Farmington Hills, MI. All rights reserved. This material may not be reproduced or copied, in whole or part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of ACI. The technical committees responsible for ACI committee reports and standards strive to avoid ambiguities, omissions, and errors in these documents. In spite of these efforts, the users of ACI documents occasionally find information or requirements that may be subject to more than one interpretation or may be incomplete or incorrect. 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Kelley Eugenio M. Santiago Eric L. Edelson Carl J. Larosche Constadino Sirakis Garth J. Fallis John S. Lund Gene R. Stevens Paul Gaudette Marjorie M. Lynch Fred R. Goodwin Tracy D. Marcotte Consulting Members Peter Emmons Randall W. Poston Subcommittee Members Jared Brewe Gaur Johnson J. Gustavo Tumialan Kip Gatto Patrick D. Martin David W. Whitmore Anton Gueorguiev Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures (ACI 562) and Commentary (Provisional Standard) SYNOPSIS ACI 562-16 – “Code Requirements for Assessment, Repair and Rehabilitation of Existing Concrete Structures” was developed to provide design professionals involved in the assessment of existing concrete structures 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 562-16 was specifically developed to work with the International Existing Building code (IEBC) or to be adopted as a stand-alone code. Keywords: assessment; bond; damage; licensed design professional; durability; existing structure; evaluation; FRP; interface bond; maintenance; rehabilitation; reliability; repair; strengthening; unsafe. 2 American Concrete Institute Copyrighted Material -- concrete.org Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures (ACI 562) and Commentary (Provisional Standard) CONTENTS Chapter 1—General requirements 1.1 General 1.2 Criteria for the assessment and design of repair and rehabilitation of existing concrete structures 1.3 Applicability of this code 1.4 Administration 1.5 Responsibilities of the licensed design professional 1.6 Construction documents 1.7 Preliminary evaluation Chapter 2—Notation and Definitions 2.1 Notation 2.2 Definitions Chapter 3—Referenced standards Chapter 4—Criteria when using this code with International Existing Building code (IEBC) 4.1 General 4.2 Compliance method 4.3 Unsafe structural conditions 4.4 Substantial structural damage 4.5 Conditions of deterioration, faulty construction or damage less than substantial structural damage 4.6 Conditions of deterioration, faulty construction, or damage less than substantial structural damage without strengthening 4.7 Additions 4.8 Alterations 4.9 Changes of occupancy Chapter 5—Loads, factored load combinations, and strength-reduction factors 5.1 General 5.2 Load factors and load combinations 5.3 Strength reduction factors for rehabilitation design 3 American Concrete Institute Copyrighted Material -- concrete.org Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures (ACI 562) and Commentary (Provisional Standard) 5.4 Strength reduction factors for assessment 5.5 Additional load combinations for structures rehabilitated with external reinforcing systems Chapter 6—Assessment, evaluation, and analysis 6.1 Structural assessment 6.2 Investigation and structural evaluation 6.3 Material properties 6.4 Test methods to quantify material and member properties 6.5 Structural analysis of existing structures 6.6 Structural serviceability 6.7 Structural analysis for repair design 6.8 Strength evaluation by load testing 6.9 Recommendations Chapter 7—Design of structural repairs 7.1 General 7.2 Strength and serviceability 7.3 Behavior of repaired systems 7.4 Interface bond 7.5 Materials 7.6 Design and detailing considerations 7.7 Repair using supplemental post-tensioning 7.8 Repair using fiber-reinforced polymer (FRP) composites 7.9 Performance under fire and elevated temperatures Chapter 8—Durability 8.1 General 8.2 Cover 8.3 Cracks 8.4 Corrosion and deterioration of reinforcement and metallic embedments 8.5 Surface treatments and coatings Chapter 9—Construction 4 American Concrete Institute Copyrighted Material -- concrete.org Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures (ACI 562) and Commentary (Provisional Standard) 9.1 General 9.2 Stability and temporary shoring requirements 9.3 Temporary conditions 9.4 Environmental issues Chapter 10—Quality assurance 10.1 General 10.2 Inspection 10.3 Testing of repair materials 10.4 Construction observations Chapter 11—Commentary references Appendix A—Criteria when using this code as a stand-alone code A.1 General A.2 Design-basis code criteria A.3 Unsafe structural conditions A.4 Substantial structural damage A.5 Conditions of deterioration, faulty construction or damage less than substantial structural damage A.6 Conditions of deterioration, faulty construction, or damage less than substantial structural damage without strengthening A.7 Additions A.8 Alterations A.9 Changes of occupancy PREFACE This code provides minimum requirements for assessment, repair, and rehabilitation of existing structural concrete buildings, members, systems and where applicable, nonbuilding structures. This code can supplement the International Existing Building Code (IEBC 2015), supplement the code governing existing structures of a local jurisdictional authority, or act as a stand-alone code 5 American Concrete Institute Copyrighted Material -- concrete.org Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures (ACI 562) and Commentary (Provisional Standard) in a locality that has not adopted an existing-building code. When this code is used as a stand- alone code, Appendix A is used in place of Chapter 4. This code provides requirements for assessment, design and construction, or implementation of repairs and rehabilitation, including quality assurance requirements, for structural concrete in service. This code has no legal status unless it is adopted by the jurisdictional authority. Where the code has not been adopted, it provides minimum requirements