AnACl Standard
Assessment Repair and RehabilitationofExisting ConcreteStructures-Code and Commentary
Reported by ACl Committee562
Assessment Repair andRehabilitation of Existing ConcreteStructures- Codeand Commentary
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Assessment Repair andRehabilitationofExisting ConcreteStructures-CodeandCommentary
An ACI Standard
ReportedbyAClCommittee562
Khaled Nahlawi Non-Voting Secretary
Carl J. Larosche ChairVOTING MEMBERSF. Michael Barlett Tarck AIkhdji Keith E. Kesner Karim Helmi Kyle D. Stanish John F.SilvaMichael D. Beoan Nicholas J. Carino Brian A. Lucarelli Ming Liu J. Gustave Tumialan Jeffrey S. WestMathew D. D'Ambrosia Lisa R. Feldman Tracy D. Marcotte John S. Lund Duvid W. Whitmore Mark E. williamsNestore Galati Andrea J. Schokker Paul H. ZiehlCONSULTING MEMBERSPaolo Casadei Kelly CobeenSUBCOMMITTEEMEMBERSMohammed Galal Alnagpr Wit Beckwith Mohammad Jalalpour R. Doug Hooton Conrad Paulson Jose PachecoMichael C.Bewn Sergio Brela Gaur Johnson lnsung Kim Giosanni A Plizzari Diego RomeroRichand Cantin g w Vinnt Lapointe Jenah C. Kurth Geore W. Seegebrecht Gene R. StevensJeffrey R. Carlson Kevin Conroy Aaron K. Larosche Michael W. Lee Pericles C. Stivaros Peter StynoskiMehamed EIBatanouny Jeremiah D. Fasl Bartosz Lipinski Kenton McBride Michael D. A Thomas Eric J. Van DuyneThomus L. Gernay Kip Gatto Kevin Mueller Javeed Munshi John F. Vincnt Joshua WhitePawan R. Gupta Wiliam O. Wilson
CONTENTS
Existintg Concrete StrecturesCode Requrirements and Commen- ACI CODE-562-21 “Assessment Repair and Rehabilitarion eftary “ was developed to provide design prfesionals α code for the assessment of the damage and deterioration and the design ofappriarn rebto strishCde pvis minimm reqiremens for ssesmt repair n reliionof existing structaral concrete brildings mmbers systems and.where applicable mobrilding strcferes. ACI 562-19 was specjf- cally developed to work with she Intermational Existing BuildingCode (IEBC) or to be adopted as a stand-alone code.
PREFACE p.3
CHAPTER1-GENERALREQUIREMENTS p.5
1.1-Scope p.51.3Purpose p. 5 1.2-General.p.5
Keywerds: assessment; bond: corrosion: damage: durabilty: evalua- tion; existing structure; fiber-reinferced polymer (FRP); interface bond;licensed design professional; maintenance; rehabilitation: reliability: repair strengthening.
1.4--Applicability of this Code p. 51.5--Administration p. 71.6Design and construction documents p. 8
1.7-Assessment design.and construction requirementsif used with an existing building code p. 9 1.8Assessment design and construction requirementsif not used with an existing building code p. 11CHAPTER2-NOTATIONANDDEFINITIONS P.142.2-Definitions p.15 2.1-Notation p.14CHAPTER3-REFERENCED STANDARDS p.21CHAPTER4-CRITERIAASASTAND-ALONE CODEFORASSESSMENT REPAIRANDREHABILITATIONOFEXISTINGSTRUCTURES p.23 4.1General p. 23design of existing concrete structures p. 23 4.2-Criteriafortheassessmnepairandrehabilati4.3-Potentially dangerous structural conditions p. 244.4Substantial struetural damage p. 25 4.5-Conditions of deterioration faulty construction.or damage less than substantial structural damage with strengthening p. 274.6Conditions of deterioration faulty construction strengthening p.29 or damage less than substantial structural damage without4.7Additions p.29 4.8-Alterations p. 304.9Change of occupaney or use p. 31
CHAPTER5-LOADS FACTOREDLOADFACTORS p.32 COMBINATIONS ANDSTRENGTHREDUCTION5.1General p.325.2--Load factors and load binations p.32 5.3-Strength reduction factors for rchabilitation design p.33 5.4-Strength reduction factors for assessment p. 335.5-Aditional load binations forstructures rehabilitated with extermal reinforcing systems p. 34
CHAPTERASSESSMENT EVALUATIONANDANALYSIS p.376.2Investigation and structural evaluation.p.37 6.1Struetural assessment p. 376.3-Material properties p. 38 6.4Test methods to quantify material and member properties p. 406.5-Structural analysis of existing struetures p. 44 6.6Structural serviceability p. 456.8Strength evaluation by load testing p. 46 6.7-Stctural anlysis forrepair design p.45REPAIRS p.48 CHAPTER7-DESIGNOFSTRUCTURAL7.2-Strengthand serviceabiltyp48 7.1-General p.487.3Behavior ofrepaired systems p.487.4Interface bond of cementitious repair materials p. 49 7.5-Materials. p. 527.7-Repairusing supplemental post-lensioning p.57 7.6-Design and detailing considerationsp.537.8Repair using fiberreinfored polymer (FRP)posites. p. 58 7.9Perfommanee under fire and elevated temperatures p. 59CHAPTER8-DURABILITY p.628.2-Cover p.64 8.1-General.p.628.3Cracks.p.64 8.4Corrosion and deterioration of reinforcement andmetallic embedments p. 668.5-Surface treatments and coatings p. 68CHAPTER9-CONSTRUCTION p.69 9.1-General.p.699.2-Stability and temporary shoring requirements p. 69dsso 9.4-Environmental issues p. 71CHAPTER10-QUALITYASSURANCE p.7210.1-General.p.7210.3-Testing of repair malerials p.74 10.2-Inspection p.7210.4Construction observations.p.75CHAPTER11-COMMENTARYREFERENCES p.76Authored documents. p. 81
PREFACE
and systems. This code was developed by an ANSI-approved consensus process. This code can supplement the International Existing Building Code (IEBC) supplement the code goveming existing structures of an authorityhaving jurisdiction or actas a stand-alone code in a locality that has not adopted an existing building code.
The Code is specifically written for use by a licensed design professional. This code provides minimum requirements forassesmen deign and construtin rimlmentation ofrepairs and rehabilitatin nuing quality assuranrequrementsthe code has not ben adopted it serves as a standard to provide minimum requirements for assement design and constuc- for structural concrete in service. This code has no legal status unless it is adopted by the authority having jurisdiction. Wheretion for the repair and rehabilitation of existing structural concrete. ACI 318 provides minimum requirements for the materials design and detaiing of structural conerete buildings and where applicable nonbuilding structures and for new constuctionwithin existing structures were noted herein.
Key changes from ACI 562-19 to ACI 562-21 include:
(a) The revised code 562-21 to be used with any existing structures code (not just IEBC).(b) Chapters I and 4 have been bined. Chapter 4 was reduced to meet the goal in (a). (c) The content of Appendix A was revised and moved into the body of ACI 562 Chapter 4.(d) The deletion of Appendix A.
