1、Designation: A 1055/A 1055M 08aStandard Specification forZinc and Epoxy Dual-Coated Steel Reinforcing Bars1This standard is issued under the fixed designation A 1055/A 1055M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year
2、 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. Scope1.1 This specification covers deformed and plain steelreinforcing bars with a dual coating of zinc alloy and an epoxyc
3、oating. 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 contai
4、ned 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 u
5、nits 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 system
6、s 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 and health practices and determine the applica-bilit
7、y of regulatory 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 Specificatio
8、n for Epoxy-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
9、 833 Specification 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 Specifications
10、E 527 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 of PipelineCoatingsG62 Test Methods f
11、or 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 Aluminum,Zinc, and Their Alloys and Compos
12、ites 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 AbrasiveBlast-Cleaned Steel Surface Using a Replica Tape1This specification is u
13、nder 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 Oct. 1, 2008. Published November 2008. Originallyapproved in 2008. Last previous edition approved in 2008 as
14、A 1055 08.2For 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 Society (AWS), 550
15、 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, United States.2.
16、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 Concrete Reinforcing Steel Institute:6Voluntary Certification Progra
17、m 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 adhesion between the fusion-bonded powder coating and the zinc-coated
18、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 and fused to form a continu-ous barrier coating.3.1.3 holiday, na
19、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), na zinc andzinc alloy, or both, wire used in depositing a meta
20、llized 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 surfacetension of water allowing it to penetrate more effectively
21、 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 steel rein-forcing bars under this specification. Such requirements
22、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 the powder coating and provision oftest data (5.3 and 5.4),4.1.6
23、 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 required (8.4.1 andSection 14),4.1.10 Additional specimens to be provide
24、d to the purchaserfor testing from the coated steel reinforcing bars being fur-nished (12.1), and5Available 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 PlumGro
25、ve 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 Zinc-Alloy WiresCommon Name(UNS)AAl,maxunless notedCd,maxCu,maxFe,maxPb
26、,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 0.003 0.001 0.002 0.003 0.003 99.995 0.00599.95 Zinc()0.01 0.02 0.001 0.
27、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 accordance with Practice E 527.BIn accordance with ANSI/AWS A5.33.CThe follo
28、wing 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 place of figures used in expressing the limiting value, in accordance with
29、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 615, A 706,or A 996A 615M, A 706M,or A 996MBend Angle(AfterRebound,degrees)Time toCompletionmax, sBarNo.Mandr
30、elDiametermmABarNo.MandrelDiameterin.A3 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 57 580 90 45AMandrel diameters specified for similar size (shown on the same line)
31、inch-pound bars and metric may be interchanged.A 1055/A 1055M 08a24.1.11 Manufacturer qualification and 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 su
32、ch 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: A 615,A 706, or A 996 A 615M, A 706M, or A 996M as specifiedby the purchaser and shall be free of contaminate
33、s 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 surface imperfections are difficult to coatproperly and should not be coated. The coating will
34、 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 B 833 or to AWS C2.25/C2.25M.5.2.2 The wire shall conform to one of the chemicalcompositio
35、n 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 sprayingequipment. The wire shall uncoil readily and be free of bendsor kinks that woul
36、d 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 equipment or coatingprocess.5.2.5 The starting end of each coil shall be tagged toindicate
37、 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 report for review.5.3.2 A written certification shall be furnished to the pur-chaser t
38、hat 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 ofth
39、is 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 storage temperature is below the plantambient temperature, the powder coating shall be
40、 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 representative 8-oz 0.2-kgsample of the powder coating shall be supplied to the purchaserfrom
41、 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 powdercoating manufacturer, shall be supplied to the purchaser.6. Surface Preparation6.
42、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 define the final surface condi-tion: SSPC-VIS 1. Average blast profile maximum roughnessdept
43、h 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 measurement instru-ment that measures the peak count as well as the maximum profile depthis reco
44、mmended.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 d
45、ry 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 recommended that incoming steel reinforcing bars andblast media be checked for salt contaminatio
46、n 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 other suitable methods to removesalt contaminants from the surface prior to blast cleaning
47、.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 and the written specification of the zincalloy supplier.7.1.1 Thermal spray equipment sha
48、ll 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 cleanedsteel reinforcing bar surface as soon as possible after the barhas been cleaned and
49、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 steel surface temperature range andpost application curing requirements. During continuous op
