1、Designation: A1094/A1094M 15aA1094/A1094M 16Standard 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*1.1 This specification covers steel reinforcing bars, with protective zinc or zinc-alloy
3、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 with
4、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 either in
5、ch-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. Therefore,
6、 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 of thi
7、s 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/A615M
8、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 for Rail
9、-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 Galvanizing of S
10、heet 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 “black
11、” 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.Current edi
12、tion approved Nov. 1, 2015April 1, 2016. Published April 2016. Originally approved in 2015. Last previous edition approved in 2015 as A1094/A1094M 15. Published 15a. January 2016. DOI: 10.1520/A1094_A1094M-15A.10.1520/A1094_A1094M-16.2 For referencedASTM standards, visit theASTM website, www.astm.or
13、g, or contactASTM 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 change
14、s have been made 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 officia
15、l document.*A Summary 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
16、through a moltenbath 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 alumin
17、um is purposelysupplied 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
18、shift.4. Ordering 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),issue) (5.1),
19、4.1.2 Quantity of bars,4.1.3 Size and grade of bars, and4.1.4 ASTM designation A1094 A1094M and year-dateyear 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 Requirement
20、s for inspection (8.1),4.2.3 Manufacturer certification and report of test results (10.1), and4.2.4 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
21、bath metal used to produce continuous hot-dip galvanized steel bars for concrete 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 locate
22、dabove a zinc or zinc-alloy bath, then immediately through an air or steam 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 manufa
23、cturer to maintain identity of the reinforcing bars throughout the coating 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 Coa
24、ting thickness tests shall be performed in accordance with one of the following 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, or6.4.1.2 MicroscopyThe thickness of th
25、e 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 optical microscope todetermine the coating thickness. Measurements of thickness shall not be taken on points
26、located on ribs or deformations, orTABLE 1 Minimum Average Coating Thickness Grade andEquivalent Weight MassACoatingGrade m mils oz/ft2 g/m2 mg/cm250 50 2.0 1.2 360 36A The value in micrometres (m) is based on the Coating Grade. The other valuesare based on conventions using the following formulae:
27、mils = m 0.03937; oz/ft2= m 0.0232; g/m2 = m 7.14; and mg/cm2 = m 0.714.A1094/A1094M 1626.4.1.3 Stripping MethodThe thickness of the coating shall be determined by stripping the coating from a reinforcing bar inaccordance with Test Method A90/A90M. This test method shall not be used for deformed ste
28、el 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 samples of plain bars with a minimum of 3 in.2 200 m
29、m2 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 thickness gauge measurement sample, five or more measurement
30、s 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 tested per lot. Each sample shall bemeasured on four
31、 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 1, six additional random samplesfrom the lot shall
32、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.NOTE 4The purpose of chromate treatment is to preclude a reaction between the
33、bars and fresh portland cement paste.6.5.1 If the chromate treatment 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
34、 kg/m3 of quench water) or by quench chromating in a minimum of 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 5Proprietary chromating solutions of equivalent strength are per
35、mitted in place of the generic chemical treatment specified.6.5.2 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
36、chromate solution.In this case, there is no temperature requirement 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
37、, the presence of tears or sharp spikes, which make the bar hazardous 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
38、by any reasonable process of handling.8. Inspection8.1 The inspector 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 manufact
39、urershall afford the inspector all reasonable facilities to satisfy him that the coating is being furnished in accordance with thisspecification.8.1 The material shall be inspected at the manufacturers plant prior to shipment. However, if specified, the purchaser shall makethe tests which govern the
40、 acceptance or rejection of the materials in his own laboratory or elsewhere. Inspection of the zinc-coated(galvanized) reinforcing bars shall be agreed upon between the purchaser and the manufacturer as part of the purchase order orcontract.8.3 Visual inspection of materials ready for shipment shal
41、l 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 the requirements of this specification.9. Permissible Amount of Damaged Co
42、ating 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 sheared or cut ends that are repaired with a zinc-richformulation in acco
43、rdance 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 accordance with this specification. A report of the test results, shall be
44、includedwith the certification.A1094/A1094M 16310.2 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 regarded as having the same validity as a counterpart printed in thecertif
45、iers 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 absence of a signature,the organization submitting the EDI transmission is re
46、sponsible for the content of the report.NOTE 6The 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; continuous hot-dip galvanized; steel reinforcing barsAPPENDIXES(Nonmandato
47、ry 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 to the job-site and subsequent construction practices at the job-site ar
48、e 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 construction practices at the job-site. The following guidelines are inten
49、dedto 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 with 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 Conti
