ASTM A1055 A1055M-2008ae1 Standard Specification for Zinc and Epoxy Dual-Coated Steel Reinforcing Bars《锌和环氧双涂层钢筋棒的标准规范》.pdf

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1、Designation: A1055/A1055M 08a1Standard Specification forZinc and Epoxy Dual-Coated Steel Reinforcing Bars1This standard is issued under the fixed designation A1055/A1055M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of

2、 last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTETable 2 was editorially corrected in March 2010.1. Scope1.1 This specification covers deformed and plain steelreinforcing ba

3、rs with a dual coating of zinc alloy and an epoxycoating. The zinc-alloy layer is applied by the thermal spraycoating method (metallizing) followed by an epoxy coatingapplied by the electrostatic spray method.NOTE 1The coating applicator is identified throughout this specifica-tion as the manufactur

4、er.1.2 Requirements of the zinc coating are contained in Table1.1.3 Requirements for fusion-bonded powder coatings arecontained in Annex A1.1.4 Guidelines for construction practices at the job-site arepresented in Appendix X1.1.5 This specification is applicable for orders in eitherinch-pound or SI

5、units.1.6 The values stated in either inch-pound units or SI unitsare to be regarded as standard. Within the text, the SI units areshown in brackets. The values stated in each system are notexact equivalents; therefore, each system must be used inde-pendently of the other, except as specifically not

6、ed in Table 2.Combining values from the two systems may result in noncon-formance with this specification.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety an

7、d health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A615/A615M Specification for Deformed and PlainCarbon-Steel Bars for Concrete ReinforcementA706/A706M Specification for Low-Alloy Steel Deformedand Plain Bars for Con

8、crete ReinforcementA775/A775M Specification for Epoxy-Coated Steel Rein-forcing BarsA944 Test Method for Comparing Bond Strength of SteelReinforcing Bars to Concrete Using Beam-End SpecimensA996/A996M Specification for Rail-Steel and Axle-SteelDeformed Bars for Concrete ReinforcementB117 Practice fo

9、r Operating Salt Spray (Fog) ApparatusB833 Specification for Zinc and Zinc Alloy Wire for Ther-mal Spraying (Metallizing) for the Corrosion Protection ofSteelD4060 Test Method for Abrasion Resistance of OrganicCoatings by the Taber AbraserE29 Practice for Using Significant Digits in Test Data toDete

10、rmine Conformance with SpecificationsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)G8 Test Methods for Cathodic Disbonding of PipelineCoatingsG14 Test Method for Impact Resistance of Pipeline Coat-ings (Falling Weight Test)G20 Test Method for Chemical Resistance o

11、f PipelineCoatingsG62 Test Methods for Holiday Detection in Pipeline Coat-ings2.2 American Welding Society:3ANSI/AWS A5.33 Specification for Solid and CeramicWires and Ceramic Rods for Thermal SprayingAWS C2.23M/C2.23 Specification for the Application ofThermal Spray Coatings (Metallizing) of Alumin

12、um,Zinc, and Their Alloys and Composites for the CorrosionProtection for SteelAWS C2.25/C2.25M Specification for Thermal SprayFeedstockSolid and Composite Wire and Ceramic Rods2.3 NACE International Standard:4RP-287 Field Measurement of Surface Profile of Abrasive1This specification is under the jur

13、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 Oct. 1, 2008. Published November 2008. Originallyapproved in 2008. Last previous edition approved in 2008 as A1055 08. DO

14、I:10.1520/A1055_A1055M-08A.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 Welding S

15、ociety (AWS), 550 NW LeJeune Rd.,Miami, FL 33126, http:/www.aws.org.4Available from National Association of Corrosion Engineers (NACE), 1440South Creek Dr., Houston, TX 77084-4906, http:/www.nace.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,

16、 United States.Blast-Cleaned Steel Surface Using a Replica Tape2.4 Society for Protective Coatings Specifications:5SSPC-PA 2 Measurement of Dry Coating Thickness withMagnetic GagesSSPC-SP 10 Near-White Blast CleaningSSPC-VIS 1 Pictorial Surface Preparation standards forPainting Steel Surfaces2.5 Con

17、crete Reinforcing Steel Institute:6Voluntary Certification Program for Fusion Bonded EpoxyCoating Applicator Plants2.6 American Concrete Institute Standard:7ACI 301 Specifications for Structural Concrete3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 disbonding, nloss of adhes

18、ion between the fusion-bonded powder coating and the zinc-coated steel reinforcingbar.3.1.2 fusion-bonded powder coating, na product contain-ing pigments, thermosetting resins, cross-linking agents, andother additives, which is applied in the form of a powder ontoa clean, heated metallic substrate a

19、nd fused to form a continu-ous barrier coating.3.1.3 holiday, na discontinuity in a coating that is notdiscernible to a person with normal or corrected vision.3.1.4 patching material, na liquid two-part, epoxy coat-ing used to repair damaged or uncoated areas.3.1.5 thermal spray coating (metallizing

20、), na zinc andzinc alloy, or both, wire used in depositing a metallized layerof zinc by thermal spraying (metallizing) using oxy-fuel orelectric-arc thermal spraying which is applied onto a clean,heated metallic substrate to form a continuous coating.3.1.6 wetting agent, na material that lowers the

21、surfacetension of water allowing it to penetrate more effectively intosmall discontinuities in the coating giving a more accurateindication of the holiday count.4. Ordering Information4.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for the coated ste

22、el rein-forcing bars under this specification. Such requirements to beconsidered include but are not limited to the following:4.1.1 Reinforcing bar specification and year of issue,4.1.2 Quantity of bars,4.1.3 Size and grade of bars,4.1.4 Requirements for the zinc coating (5.2),4.1.5 Requirements for

23、 the powder coating and provision oftest data (5.3 and 5.4),4.1.6 Requirements for patching material (5.5),4.1.7 Quantity of patching material,4.1.8 Specific requirements for test frequency (9.1),4.1.9 Whether a report on tests performed on the coatedsteel reinforcing bars being furnished is require

24、d (8.4.1 andSection 14),5Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,Pittsburgh, PA 15222-4656, http:/www.sspc.org.6Available from Concrete Reinforcing Steel Institute (CRSI), 933 North PlumGrove Rd., Schaumburg, IL 60173-4767, http:/www.crsi.org.7Available from Ame

25、rican Concrete Institute (ACI), P.O. Box 9094, FarmingtonHills, MI 48333-9094, http:/www.aci-int.org.TABLE 1 Chemical Composition Requirements for Zinc and Zinc-Alloy WiresCommon Name(UNS)AAl,maxunless notedCd,maxCu,maxFe,maxPb,maxSn,maxSb,maxAg,maxBi,maxAs,maxNi,maxMg,maxMo,maxTi,maxZn,minOther,Tot

26、al max99.99 ZincB(Z13005)0.002C0.003 0.005 0.003 0.003 0.001 D 99.99 99.99 ZincB(Z15005)0.01 0.02 0.02 0.02 0.03 99.9 0.10 total non-Zn99.995 Zinc()E0.001 0.003 0.001 0.002 0.003 0.003 99.995 0.00599.95 Zinc()0.01 0.02 0.001 0.02 0.03 0.001 99.95 0.05099.95 Zinc()0.01 0.005 0.7 0.01 0.005 0.001 0.01

27、 0.01 0.18 99 1.098Zn/2Al(Z30402)1.5-2.5 0.005 0.005 0.02 0.005 0.003 0.10 0.015 0.02 0.002 0.005 0.02 remainder AUNS designations were established in accordance with Practice E527.BIn accordance with ANSI/AWS A5.33.CThe following applies to all specified limits in this table. For the purposes of de

28、termining conformance with this specification, an observed value obtained from analysisshall be rounded off to the nearest unit in the last right-hand place of figures used in expressing the limiting value, in accordance with the rounding method of Practice E29.D indicates that the element is not ap

29、plicable.E() indicates no Unified Numbering System (UNS) designation for this option.TABLE 2 Bend Test RequirementsA615, A706,or A996A615M, A706M,or A996MBend Angle(AfterRebound,degrees)Time toCompletionmax, sBarNo.MandrelDiameterin.ABarNo.MandrelDiametermmA3 3 10 75 180 154 4 13 100 180 155 5 16 12

30、5 180 156 6 19 150 180 157 7 22 175 180 458 8 25 200 180 459 9 29 230 180 4510 10 32 250 180 4511 11 36 280 180 4514 17 43 430 90 4518 23 57 580 90 45AMandrel diameters specified for similar size (shown on the same line)inch-pound bars and metric may be interchanged. Headings were corrected editoria

31、lly.A1055/A1055M 08a124.1.10 Additional specimens to be provided to the purchaserfor testing from the coated steel reinforcing bars being fur-nished (12.1), and4.1.11 Manufacturer qualification and certification require-ments (if any).NOTE 2It is recommended that the coating application procedures a

32、ndprocesses be audited by an independent certification program for coatingapplicator plants such as that provided by the Voluntary CertificationProgram or equivalent.5. Materials5.1 Steel reinforcing bars to be coated shall meet therequirements of one of the following specifications: A615M,A706M, or

33、 A996M A615, A706, or A996 as specified by thepurchaser and shall be free of contaminates such as oil, grease,or paint.NOTE 3Prior to coating, the steel reinforcing bars should be inspectedfor their suitability for coating. Bars with sharp edges on the deformations,rolled-in slivers, or other surfac

34、e imperfections are difficult to coatproperly and should not be coated. The coating will flow away from thesharp edges and may result in inadequate coating thickness at these points.5.2 Zinc-Alloy Wire:5.2.1 The thermal spray coating feedstock material shall bespecified according to Specification B8

35、33 or to AWS C2.25/C2.25M.5.2.2 The wire shall conform to one of the chemicalcomposition requirements prescribed in Table 1.5.2.3 The wire shall be clean and free of corrosion, adheringforeign material, scale, seams, nicks, burrs, and other defectswhich would interfere with the operation of thermal

36、sprayingequipment. The wire shall uncoil readily and be free of bendsor kinks that would prevent its passage through the thermalspray gun.5.2.4 The wire shall be a continuous length per spool, coil,or drum. Splices or welds are permitted, provided that they donot interfere with the thermal spray equ

37、ipment or coatingprocess.5.2.5 The starting end of each coil shall be tagged toindicate winding direction and to be readily identifiable withASTM designation.5.3 Powder Coating:5.3.1 The powder coating shall meet the requirements ofAnnex A1. Upon request, the purchaser shall be provided withthe test

38、 report for review.5.3.2 A written certification shall be furnished to the pur-chaser that properly identifies the number of each lot of powdercoating used in the order material quantity represented, datemanufacture, name and address of the powder coating manu-facturer, and a statement that the supp

39、lied powder coating is thesame composition as that qualified according to Annex A1 ofthis specification.5.3.3 The powder coating shall be stored in a temperature-controlled environment following the written recommenda-tions of the powder coating manufacturer until ready for use.At that point, if the

40、 storage temperature is below the plantambient temperature, the powder coating shall be given suffi-cient time to reach approximate plant ambient temperature.The powder coating shall be used within the powder coatingmanufacturers written recommended shelf life.5.4 If specified in the order, a repres

41、entative 8-oz 0.2-kgsample of the powder coating shall be supplied to the purchaserfrom each batch. The sample shall be packaged in an airtightcontainer and identified by batch number.5.5 If specified in the order, patching material compatiblewith the coating, inert in concrete, and approved by the

42、powdercoating manufacturer, shall be supplied to the purchaser.6. Surface Preparation6.1 The surface of the steel reinforcing bars to be coatedshall be cleaned by abrasive blast cleaning to near-white metalin accordance with SSPC-SP 10. The following visual standardof comparison may be used to defin

43、e the final surface condi-tion: SSPC-VIS 1. Average blast profile maximum roughnessdepth readings of 1.5 to 4.0 mils 0.04 to 0.10 mm asdetermined by replica tape measurements using NACE RP-287, shall be considered suitable as an anchor pattern.NOTE 4The use of a “profilometer”-type surface measureme

44、nt instru-ment that measures the peak count as well as the maximum profile depthis recommended.NOTE 5Abrasive blast cleaning of steel reinforcing bars with a highdegree (90 %) of grit in the cleaning media provides the most suitableanchor profile for coating adhesion. After grit has been recycled, a

45、 smallportion will take on the appearance of shot.6.2 Multidirectional, high-pressure dry air knives shall beused after blasting to remove dust, grit, and other foreignmatter from the blast-cleaned steel surface. The air knives shallnot deposit oil on the steel reinforcing bars.NOTE 6It is recommend

46、ed that incoming steel reinforcing bars andblast media be checked for salt contamination prior to use. Blast mediafound to be salt contaminated should be rejected. Steel reinforcing barsfound to be salt contaminated from exposure to deicing salts or salt sprayshould be cleaned by acid washing or oth

47、er suitable methods to removesalt contaminants from the surface prior to blast cleaning.7. Coating Application7.1 A thin zinc-alloy layer shall be applied by a thermal arcspray (metallization) system directly after the blast cleaningand before the powder coating in accordance withAWS C2.23M/C2.23 an

48、d the written specification of the zincalloy supplier.7.1.1 Thermal spray equipment shall be set up, calibrated,and operated according to the manufacturers instructions andtechnical manuals or the Thermal Coating Spray applicatorsrecommendation.7.2 The zinc-alloy coating shall be applied to the clea

49、nedsteel reinforcing bar surface as soon as possible after the barhas been cleaned and before visible oxidation of the surfaceoccurs as discernible to a person with normal or correctedvision. In no case shall application of the coating be delayedmore than 30 minutes after cleaning.7.3 The fusion-bonded epoxy powder coating shall beapplied in accordance with Specification A775/A775M and thewritten recommendations of the manufacturer of the powdercoating for initial