1、Designation: A1094/A1094M 15A1094/A1094M 15aStandard Specification forContinuous Hot-Dip Galvanized Steel Bars for ConcreteReinforcement1This standard is issued under the fixed designation A1094/A1094M; the number immediately following the designation indicates theyear of original adoption or, in th
2、e case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope Scope*1.1 This specification covers steel reinforcing bars, with protective zinc or zinc-
3、alloy coatings applied by the continuous hot-dipprocess.NOTE 1The galvanizer is identified throughout this specification as the manufacturer.1.2 Guidelines for construction practices at the job-site are presented in Appendix X1.1.3 Guidelines for use of continuous hot-dip galvanized reinforcing bars
4、 with non-galvanized steel forms are presented inAppendix X2.1.4 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotesshall not be considered requirements of the specification.1.5 This specification is applicable for orders in eit
5、her inch-pound units (as Specification A1094) or SI units (as SpecificationA1094M).1.6 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units areshown in brackets. The values stated in each system may not be exact equivalents. Ther
6、efore, each system shall be usedindependently of the other. Combining values from the two systems may result in non-conformance with this specification.1.7 This specification does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user
7、of this specification to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy CoatingsA615/
8、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 Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized CoatingsA996/A996M Specification fo
9、r Rail-Steel and Axle-Steel Deformed Bars for Concrete ReinforcementB6 Specification for ZincB487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross SectionB852 Specification for Continuous Galvanizing Grade (CGG) Zinc Alloys for Hot-Dip Galvanizin
10、g of Sheet SteelE376 Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Testing Methods3. Terminology3.1 Definitions of Terms Specific to This Specification:3.1.1 black, adjdenotes the condition of not galvanized. For purposes of this specification the word
11、“black” does not refer tothe color or condition of the surface, or to a surface deposit or contamination.1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.05on Steel Reinforcement.Curre
12、nt edition approved May 1, 2015Nov. 1, 2015. Originally approved in 2015. Last previous edition approved in 2015 as A1094/A1094M 15. Published May2015January 2016. DOI: 10.1520/A1094_A1094M-15.10.1520/A1094_A1094M-15A.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactAST
13、M Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made
14、 to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Su
15、mmary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.2 continuous hot-dip galvanizing, nthe process of uninterrupted passage of long lengths of steel products through a molten
16、bath of zinc or zinc-alloy.3.1.2.1 DiscussionTo control alloy formation and promote adhesion of the zinc or zinc-alloy coating with the steel base metal, the molten coatingmetal composition normally contains a percentage of aluminum usually in the range from 0.05 to 0.25. This aluminum is purposelys
17、upplied to the molten coating bath, either as a specified ingredient in the zinc spelter or by the addition of a master alloy containingaluminum.3.1.3 lot, nall bars of one size furnished to the same steel reinforcing bar specification that have been coated within a singleproduction shift.4. Orderin
18、g Information4.1 Orders for continuous hot-dip galvanized steel bars for concrete reinforcement under this specification shall include thefollowing information:4.1.1 Specification for reinforcing bars, deformed or plain, to be coated (ASTM designation and year of issue),4.1.2 Quantity of bars,4.1.3
19、Size and grade of bars, and4.1.4 ASTM designation A1094 A1094M and year-date of issue.4.2 The purchaser shall have the option to specify additional requirements, including but not limited to, the following:4.2.1 If chromate treatment is waived (6.5),4.2.2 Manufacturer certification and report of tes
20、t results (10.1), and4.2.3 Other special requirements, if any.5. Materials5.1 The steel reinforcing bars shall conform to one of the following specifications: A615, A706, or A996 A615M, A706M, orA996M.5.2 Coating Bath MetalThe bath metal used to produce continuous hot-dip galvanized steel bars for c
21、oncrete reinforcementshall meet the requirements of Specifications B6 or B852.6. Zinc Coating Process6.1 The reinforcing bars shall be coated by passing individual bars through a zinc or zinc-alloy flooded trough or tube locatedabove a zinc or zinc-alloy bath, then immediately through an air or stea
22、m wiping device to remove excess coating from the bars.NOTE 2During the wiping process, care should be taken to maintain a uniformly thick coating around the perimeter of the bar.6.2 It shall be the responsibility of the manufacturer to maintain identity of the reinforcing bars throughout the coatin
23、g processand to the point of shipment.6.3 Thickness of Coating:6.3.1 The average thickness of zinc or zinc-alloy coating for all specimens tested shall not be less than specified in Table 1.6.4 Coating Thickness Tests:6.4.1 Coating thickness tests shall be performed in accordance with one of the fol
24、lowing test methods:6.4.1.1 Magnetic Thickness Gauge MeasurementsThe thickness of the coating shall be determined by magnetic thicknessgauge measurements in accordance with Practice E376, orTABLE 1 Minimum Average Coating Thickness GradeACoatingGrade m mils oz/ft2 g/m250 50 2.0 1.2 360TABLE 1 Minimu
25、m Average Coating Thickness Grade andEquivalent Weight MassACoatingGrade m mils oz/ft2 g/m2 mg/cm250 50 2.0 1.2 360 36A The valuesvalue in micrometres (m) areis based on the Coating Grade. Theother values are based on conventions using the following formulae: mils = m 0.03937,0.03937; oz/ft2 = m 0.0
26、232,0.0232; g/m2 = m 7.147.14; and mg/cm2= m 0.714.A1094/A1094M 15a26.4.1.2 MicroscopyThe thickness of the coating shall be determined by cross-sectional and optical measurement in accordancewith Test Method B487. A cross-section sample of the coated steel shall be polished and examined with an opti
27、cal microscope todetermine the coating thickness. Measurements of thickness shall not be taken on points located on ribs or deformations, or6.4.1.3 Stripping MethodThe thickness of the coating shall be determined by stripping the coating from a reinforcing bar inaccordance with Test Method A90/A90M.
28、 This test method shall not be used for deformed steel reinforcing bars.NOTE 3Due to variations in the surface areas of deformed bars as a function of deformation pattern and bar size, this method to measure coatingthickness is not appropriate for deformed bars. This is a destructive test for small
29、samples of plain bars with a minimum of 3 in.2 200 mm2 of surfacearea,6.4.2 The referee method to be used shall be Test Method B487.6.4.3 Number of TestsFor determination of the coating thickness using the magnetic method, three random samples shall betested from each lot. For each magnetic thicknes
30、s gauge measurement sample, five or more measurements shall be made at variouspoints throughout the sample so as to represent the entire surface of the sample. A total of at least fifteen measurements shall beaveraged to obtain the coating thickness. For the microscopy method, five samples shall be
31、tested per lot. Each sample shall bemeasured on four sides and the total of twenty measurements shall be averaged to obtain the coating thickness. For the strippingmethod, three samples per lot shall be tested.6.4.4 RetestsIf the average zinc coating thickness fails to meet the requirements of Table
32、 1, six additional random samplesfrom the lot shall be tested. If the average zinc coating thickness of the six samples conforms to the requirements of Table 1, thelot shall be accepted.6.5 ChromatingThe zinc coating shall be chromate treated unless waived by the purchaser.6.5.1 If the chromate trea
33、tment is performed immediately after zinc or zinc-alloy coating, it shall be accomplished by quenchingthe steel reinforcing bars in a solution containing at least 0.2 weight mass % of pure sodium dichromate in water (such as 3 oz/10gal 2 kg/m3 of quench water) or by quench chromating in a minimum of
34、 0.2 % chromic acid solution. The solution shall be atleast 90F 32C. The zinc or zinc-alloy coated reinforcing bars shall be immersed in the solution for at least 20 s.NOTE 4Proprietary chromating solutions of equivalent strength are permitted in place of the generic chemical treatment specified.6.5
35、.2 If the zinc or zinc-alloy coated reinforcing bars are at ambient temperature, the chromate treatment shall be the same asspecified in 6.5.1 except that 0.5 to 1.0 % concentration of sulfuric acid shall be added as an activator of the chromate solution.In this case, there is no temperature require
36、ment for the activated chromate solution.7. Finish and Adherence of Coating7.1 The zinc-coated bars shall have no uncoated areas. The coating shall be free of blisters, flux spots or inclusions, dross, andacid or black spots. In addition, the presence of tears or sharp spikes, which make the bar haz
37、ardous to handle, shall be cause forrejection.7.2 The zinc coating shall not peel or flake off in any bend test meeting the requirements of Specifications A615, A706, or A996A615M, A706M, or A996M and be adherent so it cannot be removed by any reasonable process of handling.8. Inspection8.1 The insp
38、ector representing the purchaser shall have access at all times, while work on the contract of the purchaser is beingperformed, to those areas of the manufacturers plant which concern the manufacture of the material ordered. The manufacturershall afford the inspector all reasonable facilities to sat
39、isfy him that the coating is being furnished in accordance with thisspecification.8.2 The material shall be inspected at the manufacturers plant prior to shipment. However, if specified, the purchaser shall makethe tests which govern the acceptance or rejection of the materials in his own laboratory
40、 or elsewhere.8.3 Visual inspection of materials ready for shipment shall be made to determine conformity with the requirements of 7.1. Formaterials that fail inspection, it shall be permissible for the materials to be stripped and regalvanized and resubmitted forinspection. They shall conform to th
41、e requirements of this specification.9. Permissible Amount of Damaged Coating and Repair of Damaged Coating9.1 The maximum amount of repaired damaged coating shall not exceed 1 % of the total surface area in each 0.3-m 1-ft lengthof the bar. This limit on repaired damaged coating shall not include s
42、heared or cut ends that are repaired with a zinc-richformulation in accordance with Practice A780/A780M.10. Certification10.1 When specified in the purchase order or contract, the manufacturer shall furnish, at the time of shipment, a certificationthat the material was manufactured and tested in acc
43、ordance with this specification. A report of the test results, shall be includedwith the certification.A1094/A1094M 15a310.2 A Material Test Report, Certificate of Inspection, or similar document printed from or used in electronic form from anelectronic data interchange (EDI) transmission shall be r
44、egarded as having the same validity as a counterpart printed in thecertifiers facility. The content of the EDI transmitted document shall meet the requirements of the invokedASTM standard(s) andconform to any existing EDI agreement between the purchaser and the manufacturer. Notwithstanding the abse
45、nce of a signature,the organization submitting the EDI transmission is responsible for the content of the report.NOTE 5The industry definition as invoked here is: EDI is the computer-to-computer exchange of business information in a standard format such asANSI ASC X12.11. Keywords11.1 galvanizing; c
46、ontinuous hot-dip galvanized; steel reinforcing barsAPPENDIXES(Nonmandatory Information)X1. GUIDELINES FOR CONSTRUCTION PRACTICES AT THE JOB-SITEX1.1 Specification A1094/A1094M is a product specification. Requirements for continuous hot-dip galvanized steel reinforcingbars from the point of shipment
47、 to the job-site and subsequent construction practices at the job-site are not delineated in thisproduct specification.X1.2 The project specifications should prescribe requirements for the continuous hot-dip galvanized steel reinforcing bars fromthe point of shipment to the job-site and subsequent c
48、onstruction practices at the job-site. The following guidelines are intendedto serve as a resource for preparing requirements in project specifications:X1.2.1 Coating damage incurred during shipment, storage, handling, and placing of continuous hot-dip galvanized reinforcingbars should be repaired w
49、ith a zinc-rich formulation in accordance with Practice A780/A780M. Prior to repairing damaged coating,rust should be removed from the damaged areas by suitable means.X1.2.2 When handling continuous hot-dip galvanized reinforcing bars, care should be exercised to avoid damaging the coating.X1.2.3 Continuous hot-dip galvanized reinforcing bars should be off-loaded as close as possible to their points of placement orunder the crane so that the bars can be hoisted to the area of placement to minimize rehandling.X1.2.4 Continuou
