1、Designation:A767/A767M19Standard Specification forZinc-Coated(Galvanized)Steel Bars for ConcreteReinforcement1This standard is issued under the fixed designation A767/A767M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of
2、last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers steel rein
3、forcing bars withprotective zinc coatings applied by immersing the properlyprepared reinforcing bars into a molten bath of zinc.NOTE1The galvanizer is identified throughout this specification asthe manufacturer.1.2 Guidelines for construction practices at the job-site arepresented in Appendix X1.1.3
4、 Guidelines for use of zinc-coated(galvanized)reinforc-ing bars with non-galvanized steel forms are presented inAppendix X2.1.4 The text of this specification references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding those in tables)shall not be considered a
5、srequirements of the specification.1.5 This specification is applicable for orders in eitherinch-pound units(as Specification A767)or SI units(asSpecification A767M).1.6 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard.Within the text,theSI units are
6、shown in brackets.The values stated in eachsystem may not be exact equivalents.Therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in non-conformance with thisspecification.1.7 This international standard was developed in accor-dance with int
7、ernationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A90/A90
8、M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete ReinforcementA706/A706M Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete ReinforcementA780/A780M Pra
9、ctice for Repair of Damaged and UncoatedAreas of Hot-Dip Galvanized CoatingsA996/A996M Specification for Rail-Steel and Axle-SteelDeformed Bars for Concrete ReinforcementB6 Specification for ZincB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross
10、 SectionE376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy Current(Electromagnetic)Test-ing Methods2.2 ACI Standard:3ACI 301 Specifications for Structural Concrete2.3 AWS Standard:4AWS D1.4 D1.4M Structural Welding CodeReinforcingSteel3.Terminology3.1 Definition of Term Specific
11、to This Specification:3.1.1 galvanizing,nthe process of immersing(hot-dipping)steel in molten zinc for a sufficient time to allow ametallurgical reaction between iron from the steel surface andthe molten zinc.3.1.1.1 DiscussionThe reaction between steel and molten1This specification is under the jur
12、isdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel Reinforcement.Current edition approved May 1,2019.Published May 2019.Originallyapproved in 1979.Last previous edition approved in 2016 as A767/A767M 16.DOI:10.1
13、520/A0767_A0767M-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Concrete Institute(AC
14、I),P.O.Box 9094,FarmingtonHills,MI 48333-9094,http:/www.concrete.org.4Available from American Welding Society(AWS),8669 NW 36 St.,#130,Miami,FL 33166-6672,http:/www.aws.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700
15、,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World T
16、rade Organization Technical Barriers to Trade(TBT)Committee.1 zinc forms zinc/iron alloy layers that bond the coating to thesteel.The galvanizer may add trace amounts of certain ele-ments(for example,aluminum,nickel,bismuth,or tin)to thezinc bath to help in the processing of certain reactive steels orto modify the appearance of the finished product.The elementsare supplied to the molten coating bath,either as specifiedingredients in the zinc spelter or by the addition of a masteralloy containing
