1、Designation: A1055/A1055M 10Standard 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 l
2、ast 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 deformed and plain steelreinforcing bars with a dual coating of zinc alloy and an epoxycoati
3、ng. 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 manufacturer.1.2 Requirements of the zinc coating are contained
4、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 units.1.6 The values stated in either inch-pound units
5、 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 noted in Table 2.Combining values from the two systems ma
6、y 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 and health practices and determine the applica-bility of
7、 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 Concrete ReinforcementA944 Test Method for Comparing Bond
8、 Strength of SteelReinforcing Bars to Concrete Using Beam-End SpecimensA996/A996M Specification for Rail-Steel and Axle-SteelDeformed Bars for Concrete ReinforcementB117 Practice for Operating Salt Spray (Fog) ApparatusB833 Specification for Zinc and Zinc Alloy Wire for Ther-mal Spraying (Metallizin
9、g) for the Corrosion Protection ofSteelD4060 Test Method for Abrasion Resistance of OrganicCoatings by the Taber AbraserE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)
10、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 Holiday Detection in Pipeline Coat-ings2.2 American Welding Society:3ANSI/AWS A5
11、.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 for the CorrosionProtection for SteelAWS C2.25/C2.25M Specification for Therma
12、l SprayFeedstockSolid and Composite Wire and Ceramic Rods2.3 NACE International Standard:4RP-287 Field Measurement of Surface Profile of AbrasiveBlast-Cleaned Steel Surface Using a Replica Tape2.4 Society for Protective Coatings Specifications:5SSPC-PA 2 Measurement of Dry Coating Thickness withMagn
13、etic Gages1This specification is under the jurisdiction 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 Dec. 1, 2010. Published December 2010. Originallyapproved in 2008. Last pre
14、vious edition approved in 2008 as A1055 08a1. DOI:10.1520/A1055_A1055M-10.2For 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
15、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., Houston, TX 77084-4906, http:/www.nace.org.5Available from Society for Protective Coatings (SSPC
16、), 40 24th St., 6th Floor,Pittsburgh, PA 15222-4656, http:/www.sspc.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.SSPC-SP 10 Near-White Blast CleaningSSPC-VIS 1
17、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:7ACI 301 Specifications for Structural Concrete3. Terminology3.1 Defini
18、tions 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, thermosetting resins, cross-linking agents, andother additives, which is
19、 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 vision.3.1.4 patching material, na liquid two-part, epoxy coat-ing used to
20、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 spraying which is applied onto a clean,heated metallic substrate to fo
21、rm 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 count.4. Ordering Information4.1 It shall be the responsibility of the p
22、urchaser 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 specification and year of issue,4.1.2 Quantity of bars,4.1.3 Size and grade of
23、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 Specific requirements for test frequency (9.1),4.1.9 Whether a report on tests
24、 performed on the coatedsteel reinforcing bars being furnished is required (8.4.1 andSection 14),4.1.10 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
25、 (if any).6Available 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 Requireme
26、nts 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,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-Zn99.9
27、95 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 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 est
28、ablished 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 determining conformance with this specification, an observed value obtained from analysisshall be rounded off to the nearest unit in the last
29、 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 applicable.E() indicates no Unified Numbering System (UNS) designation for this option.TABLE 2 Bend Test RequirementsA615, A706,or A996A615M,
30、 A706M,or A996MBend Angle(AfterRebound,degrees)Time toCompletionmax, sBarNo.MandrelDiameterin.ABarNo.MandrelDiametermmA3 3 10 75 180 154 4 13 100 180 155 5 16 125 180 156 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 5
31、7 580 90 45AMandrel diameters specified for similar size (shown on the same line)inch-pound bars and metric may be interchanged.A1055/A1055M 102NOTE 2It is recommended that the coating application procedures andprocesses be audited by an independent certification program for coatingapplicator plants
32、 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 A996M A615, A706, or A996 as specified by thepurchaser and shall be free of contaminates s
33、uch 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 surface imperfections are difficult to coatproperly and should not be coated. The coating will fl
34、ow 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 B833 or to AWS C2.25/C2.25M.5.2.2 The wire shall conform to one of the chemicalcomposition re
35、quirements 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 sprayingequipment. The wire shall uncoil readily and be free of bendsor kinks that would pr
36、event 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 equipment or coatingprocess.5.2.5 The starting end of each coil shall be tagged toindicate win
37、ding 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 report for review.5.3.2 A written certification shall be furnished to the pur-chaser that
38、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 supplied powder coating is thesame composition as that qualified according to Annex A1 ofthis s
39、pecification.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 storage temperature is below the plantambient temperature, the powder coating shall be giv
40、en 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 representative 8-oz 0.2-kgsample of the powder coating shall be supplied to the purchaserfrom eac
41、h 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 powdercoating manufacturer, shall be supplied to the purchaser.6. Surface Preparation6.1 Th
42、e 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 define the final surface condi-tion: SSPC-VIS 1. Average blast profile maximum roughnessdepth re
43、adings 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 measurement instru-ment that measures the peak count as well as the maximum profile depthis recommen
44、ded.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 smallportion will take on the appearance of shot.6.2 Multidirectional, high-pressure dry a
45、ir 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 recommended that incoming steel reinforcing bars andblast media be checked for salt contamination pr
46、ior 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 other suitable methods to removesalt contaminants from the surface prior to blast cleaning.7.
47、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 and the written specification of the zincalloy supplier.7.1.1 Thermal spray equipment shall b
48、e 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 cleanedsteel reinforcing bar surface as soon as possible after the barhas been cleaned and befo
49、re 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 the written recommendations of themanufacturer of the powder coating for initial steel surfacetemperature range and post application curing requirements.During continuous operations, the temperature of the s
