ASTM A1055-2008 Standard Specification for Zinc and Epoxy Dual Coated Steel Reinforcing Bars.pdf

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1、Designation: A 1055 08Standard Specification forZinc and Epoxy Dual Coated Steel Reinforcing Bars1This standard is issued under the fixed designation A 1055; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision

2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers deformed and plain steelreinforcing bars with a dual coating of zinc alloy and an epoxycoating. The zinc

3、 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 manufacturer.1.2 Requirements of the zinc coating are contained in Table1.1.

4、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 either SIunits or inch pounds units.1.6 The values stated in either SI or inch-pound unit

5、s are tobe regarded as standard. Within the text, the inch-pound unitsare shown 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 noted in Table 2.Combining values from the two systems may r

6、esult 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 and health practices and determine the applica-bility of re

7、gulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A 615/A 615M Specification for Deformed and PlainCarbon-Steel Bars for Concrete ReinforcementA 706/A 706M Specification for Low-Alloy Steel De-formed and Plain Bars for Concrete ReinforcementA 775/A 775M Specification for E

8、poxy-Coated Steel Rein-forcing BarsA 944 Test Method for Comparing Bond Strength of SteelReinforcing Bars to Concrete Using Beam-End SpecimensA 996/A 996M Specification for Rail-Steel and Axle-SteelDeformed Bars for Concrete ReinforcementB117 Practice for Operating Salt Spray (Fog) ApparatusB 833 Sp

9、ecification for Zinc and Zinc Alloy Wire forThermal Spraying (Metallizing) for the Corrosion Protec-tion of SteelD 4060 Test Method for Abrasion Resistance of OrganicCoatings by the Taber AbraserE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE 527 P

10、ractice 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 of PipelineCoatingsG62 Test Methods for Holi

11、day 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 Aluminum,Zinc, and Their Alloys and Composites fo

12、r 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 jurisdiction of ASTM Committee A01 on Steel,St

13、ainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel Reinforcement.Current edition approved March 1, 2008. Published April 2008.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For An

14、nual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Welding Society (AWS), 550 NW LeJeune Rd.,Miami, FL 33126, http:/www.aws.org.4Available from National Association of Corrosion Engineers (NACE), 1440South Creek Dr.

15、, Houston, TX 77084-4906, http:/www.nace.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Blast-Cleaned Steel Surface Using a Replica Tape2.4 Society for Protective Coatings Specifications:5SSPC-PA 2 Measurement of Dry Coating Thi

16、ckness withMagnetic GagesSSPC-SP 10 Near-White Blast CleaningSSPC-VIS 1 Pictorial Surface Preparation standards forPainting Steel Surfaces2.5 Concrete Reinforcing Steel Institute:6Voluntary Certification Program for Fusion Bonded EpoxyCoating Applicator Plants2.6 American Concrete Institute Standard

17、:7ACI 301 Specifications for Structural Concrete3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 disbonding, nloss of adhesion between the fusion-bonded powder coating and the zinc coated steel reinforcingbar.3.1.2 fusion-bonded powder coating, na product contain-ing pigments,

18、thermosetting resins, cross-linking agents, andother additives, which is applied in the form of a powder ontoa clean, heated metallic substrate and 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 vis

19、ion.3.1.4 patching material, na liquid twopart, epoxy coat-ing used to repair damaged or uncoated areas.3.1.5 thermal spray coating (metallizing), na zinc andzinc alloy, or both, wire used in depositing a metallized layerof zinc by thermal spraying (metallizing) using oxy-fuel orelectric arc thermal

20、 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 surfacetension of water allowing it to penetrate more effectively intosmall discontinuities in the coating giving a more accurateindication of the holiday c

21、ount.4. Ordering Information4.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for the coated steel rein-forcing bars under this specification. Such requirements to beconsidered include but are not limited to the following:4.1.1 Reinforcing bar specific

22、ation 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 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 Specifi

23、c requirements for test frequency (9.1),4.1.9 Whether a report on tests performed on the coatedsteel reinforcing bars being furnished is required (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.6Availa

24、ble from Concrete Reinforcing Steel Institute (CRSI), 933 North PlumGrove Rd., Schaumburg, IL 60173-4767, http:/www.crsi.org.7Available from American Concrete Institute (ACI), P.O. Box 9094, FarmingtonHills, MI 48333-9094, http:/www.aci-int.org.TABLE 1 Chemical Composition Requirements for Zinc and

25、Zinc Alloy WiresCommon Name(UNS)AAl,maxunless notedCd,maxCu,maxFe,maxPb,maxSn,maxSb,maxAg,maxBi,maxAs,maxNi,maxMg,maxMo,maxTi,maxZn,minOther,Total 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

26、.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 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 accor

27、dance with Practice E 527.BIn accordance with ANSI/AWS A5.33.CThe following applies to all specified limits in this table. For the purposes of determining conformance with this specification, an observed value obtained from analysisshall be rounded off to the nearest unit in the last right-hand plac

28、e of figures used in expressing the limiting value, in accordance with the rounding method of Practice E29.D indicates that the element is not applicable.E() indicates no Unified Numbering System (UNS) designation for this option.TABLE 2 Bend Test RequirementsA 615M, A 706M,or A 996MA 615, A 706,or

29、A 996Bend Angle(AfterRebound,degrees)Time toCompletionmax, sBarNo.MandrelDiametermmABarNo.MandrelDiameterin.A10 75 3 3 180 1513 100 4 4 180 1516 125 5 5 180 1519 150 6 6 180 1520 175 7 7 180 4525 200 8 8 180 4529 230 9 9 180 4532 250 10 10 180 4536 280 11 11 180 4543 430 14 17 90 4557 580 18 23 90 4

30、5AMandrel diameters specified for similar size (shown on the same line) metricand inch-pound bars may be interchanged.A10550824.1.10 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 an

31、d certification require-ments (if any).NOTE 2It is recommended that the coating application procedures andprocesses be audited by an independent certification program for coatingapplicator plants such as that provided by the Voluntary CertificationProgram or equivalent.5. Materials5.1 Steel reinforc

32、ing bars to be coated shall meet therequirements of one of the following specifications: A 615M,A 706M, or A 996M A 615, A 706, or A 996 as specified bythe purchaser and shall be free of contaminates such as oil,grease, or paint.NOTE 3Prior to coating, the steel reinforcing bars should be inspectedf

33、or their suitability for coating. Bars with sharp edges on the deformations,rolled-in slivers, or other surface 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

34、 Alloy Wire:5.2.1 The thermal spray coating feedstock material shall bespecified according to Specification B 833, Standard for Zincand Zinc Alloy Wire for Thermal Spraying (Metallizing) forthe Corrosion Protection of Steel, or to AWS C2.25/C2.25M,Specification for Thermal Spray FeedstockSolid and C

35、om-posite Wire and Ceramic Rods.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 th

36、ermal 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 spr

37、ay equipment 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 withth

38、e test 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 th

39、e supplied 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 temperaturecontrolled environment following the written recommenda-tions of the powder coating manufacturer until ready for use.At that point, i

40、f the 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 r

41、epresentative 0.2-kg 8-ozsample 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

42、 the 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-SP10. The following visual standardof comparison may be used to d

43、efine the final surface condi-tion: SSPC-VIS 1. Average blast profile maximum roughnessdepth readings of 0.04 to 0.10 mm 1.5 to 4.0 mils 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 measu

44、rement 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 recycle

45、d, a 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 recom

46、mended 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

47、 other 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/C2.2

48、3 and 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

49、cleanedsteel 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 A 775/A 775M andthe written recommendations of the manufacturer of thepowder coating for initial stee