1、Designation: A1055/A1055M 101Standard 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.1NOTEMathematical corrections to A1.3.8 were made in December 2011.1. Scope*1.1 This specification covers deformed and plain steel
3、reinforcing bars 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
4、the manufacturer.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 eitherinc
5、h-pound or SI 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 sp
6、ecifically noted 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-pr
7、iate safety and 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 Plai
8、n Bars for Concrete ReinforcementA944 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 for Operating Salt Spray (Fog) ApparatusB833 Specific
9、ation 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 toDetermine Conformance with SpecificationsE527 Practice
10、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 Holiday Dete
11、ction 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 for the Co
12、rrosionProtection 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,Stainless
13、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 previous edition approved in 2008 as A1055 08a1. DOI:10.1520/A1055_A1055M-10E01.2For referenced ASTM
14、 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 NW LeJeune Rd.,Miami, FL 3312
15、6, http:/www.aws.org.4Available from National Association of Corrosion Engineers (NACE), 1440South Creek Dr., Houston, TX 77084-4906, http:/www.nace.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 Conshohoc
16、ken, 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 Thickness withMagnetic GagesSSPC-SP 10 Near-White Blast CleaningSSPC-VIS 1 Pictorial Surface Preparation standards forPainting St
17、eel 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 Definitions of Terms Specific to This Standard:3.1.1 disbond
18、ing, 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 applied in the form of a powder ontoa clean, heated m
19、etallic 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 repair damaged or uncoated areas.3.1.5 thermal spray c
20、oating (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 form a continuous coating.3.1.6 wetting agent, na materi
21、al 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 purchaser to specifyall requirements that are necessary
22、 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 bars,4.1.4 Requirements for the zinc coating (5.2),4.1
23、.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 performed on the coatedsteel reinforcing bars being f
24、urnished 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.6Available from Concrete Reinforcing Steel Institute (CRSI), 933 North PlumGrove Rd., Schaumburg, IL 60173-4767, http:/www.crsi.org.
25、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,maxSn,maxSb,maxAg,maxBi,maxAs,maxNi,maxMg,maxMo,maxTi
26、,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 0.02 0.03 0.001 99.95 0.05099.95 Zinc()0.01 0.005 0.7 0.
27、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 E527.BIn accordance with ANSI/AWS A5.33.CThe following applies to all specified limits in this table. For
28、 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 the rounding method of Practice E29.D indicates that th
29、e element is not applicable.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
30、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)inch-pound bars and metric may be interchanged.A1055/A1055M 1
31、0124.1.10 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 andprocesses be audi
32、ted 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 A996M A615, A706,
33、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 surface imperfections are
34、 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 B833 or to AWS C2.25/
35、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 sprayingequipment.
36、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 equipment or coatingpr
37、ocess.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 report for review.
38、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 supplied powder coating
39、 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 storage temperatur
40、e 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 representative 8-oz 0.2-k
41、gsample 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 powdercoating manuf
42、acturer, 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 define the final surface
43、 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 measurement instru-ment that
44、 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 smallportion will
45、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 recommended that incoming st
46、eel 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 other suitable methods
47、 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 and the written speci
48、fication 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 cleanedsteel reinforcin
49、g 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 the written recommendations of themanufacturer of the powder coating for initial steel surfacetemperature range and post applicatio
