1、Designation: A933/A933M 10Standard Specification forVinyl-Coated Steel Wire and Welded Wire Reinforcement1This standard is issued under the fixed designation A933/A933M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of l
2、ast revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers plain and deformed steel wireand plain and deformed steel welded wire reinforcement withprot
3、ective vinyl (polyvinyl chloride, or polyvinyl chloridepowder compound) coating. A Class A minimum coatingthickness is required for wire and welded wire reinforcementintended for use in concrete and masonry. A Class B minimumcoating thickness is required for wire and welded wire rein-forcement inten
4、ded for use in mechanically stabilized earthapplications.1.2 Other thermoplastic organic coatings may be usedprovided they meet the requirements of this specification.NOTE 1The coating applicator is identified throughout this specifica-tion as the manufacturer.1.3 Requirements for coatings are conta
5、ined in Annex A1.1.4 Requirements for patching materials are contained inAnnex A2.1.5 The text of this specification contains notes or footnotes,or both, that provide explanatory material. Such notes andfootnotes, excluding those in tables or figures, do not containany mandatory requirements.1.6 Thi
6、s specification is applicable for orders in eitherinch-pound units (as Specification A933) or in SI units asSpecification A933M.1.7 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated
7、 in eachsystem may not be exact equivalents; therefore, each systemshall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with thestandard.2. Referenced Documents2.1 ASTM Standards:2A82/A82M Specification for Steel Wire, Plain, for ConcreteReinfo
8、rcementA185/A185M Specification for Steel Welded Wire Rein-forcement, Plain, for ConcreteA496/A496M Specification for Steel Wire, Deformed, forConcrete ReinforcementA497/A497M Specification for Steel Welded Wire Rein-forcement, Deformed, for ConcreteA775/A775M Specification for Epoxy-Coated Steel Re
9、in-forcing BarsA884/A884M Specification for Epoxy-Coated Steel Wireand Welded Wire ReinforcementA1064/A1064M Specification for Steel Wire and WeldedWire Reinforcement, Plain and Deformed, for ConcreteB117 Practice for Operating Salt Spray (Fog) ApparatusD374 Test Methods for Thickness of Solid Elect
10、rical Insu-lationD2240 Test Method for Rubber PropertyDurometerHardnessD2967 Test Method for Corner Coverage of Powder Coat-ingsD4060 Test Method for Abrasion Resistance of OrganicCoatings by the Taber AbraserG8 Test Methods for Cathodic Disbonding of PipelineCoatingsG12 Test Method for Nondestructi
11、ve Measurement of FilmThickness of Pipeline Coatings on SteelG14 Test Method for Impact Resistance of Pipeline Coat-ings (Falling Weight Test)G20 Test Method for Chemical Resistance of PipelineCoatings2.2 National Association of Corrosion Engineers Stan-dards:3RP-287-87 Field Measurement of Surface
12、Profile of Abra-sive Blast Cleaned Steel Surface Using a Replica TapeTM-01-70 Visual Standard for Surfaces of New Steel AirBlast Cleaned with Sand Abrasive (NACE No. 2)TM-01-75 Visual Standard for Surfaces of New Steel Cen-trifugally Blast Cleaned with Steel Shot or Steel Grit(NACE No. 2)1This speci
13、fication is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is under the direct responsibility ofSubcommittee A01.05 on Steel Reinforcement.Current edition approved Nov. 1, 2010. Published November 2010. Originallyapproved in 1995. Last previous edition a
14、pproved in 2007 as A993/A993M 07.DOI: 10.1520/A0933_A0933M-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 ASTM website
15、.3Available 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 Conshohocken, PA 19428-2959,
16、United States.2.3 Steel Structures Painting Council Specifications:4SSPC-PA2 Measurement of Dry Coating Thickness withMagnetic GagesSSPC-SP 10 Near-White Blast CleaningSSPC-Vis 1 Pictorial Surface Preparation Standards forPainting Steel SurfacesSSPC-Vis 2 Standard Methods of Evaluating Degree ofRust
17、ing on Painted Steel Surfaces3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 conversion coating, na preparation of the blast-cleaned steel surface prior to coating application that isdesigned to pretreat the metal to promote coating adhesion,reduce metal/coating reactions, imp
18、rove corrosion resistance,and increase blister resistance.3.1.2 disbonding, nloss of adhesion between the fusion-bonded vinyl coating and the steel reinforcement.3.1.3 fusion-bonded vinyl coating, na product containingpigments, thermoplastic vinyl resin, and other additives. It isapplied in the form
19、 of a powder on a clean, heated, metallicsubstrate and fuses to form a continuous barrier coating.3.1.4 holiday, na discontinuity in a coating that is notdiscernible to a person with normal or corrected vision.3.1.5 patching material, na liquid vinyl coating used torepair damaged or uncoated areas.4
20、. Ordering Information4.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for material ordered to thisspecification. Such requirements shall include but are notlimited to the following:4.1.1 Name of material (vinyl-coated steel wire or weldedwire reinfor
21、cement),4.1.2 Wire or welded wire reinforcement specification (5.1),4.1.3 Wire size, if wire reinforcement,4.1.4 Wire spacing and sizes, if welded wire reinforcement,4.1.5 Length and width of sheets or rolls,4.1.6 Quantity,4.1.7 Class of coating,4.1.8 Requirements for material samples (5.3),4.1.9 Re
22、quirements for patching material (5.4),4.1.10 Requirements for visual standards for surface clean-ing comparison (6.1),4.1.11 Specific requirements for test frequency (9.1),4.1.12 Requirements for inspection of manufacturing plant(12.1), and4.1.13 ASTM designation and year of issue.5. Materials5.1 P
23、lain or deformed steel wire or welded wire reinforce-ment to be coated shall meet the requirements of one of theapplicable specifications: A82/A82M, A185/A185M, A496/A496M, A497/A497M,orA1064/A1064M as specified by thepurchaser, and shall be free of surface contaminants such as oil,grease, or paint
24、when received at the manufacturers plant andprior to cleaning and coating.NOTE 2Specifications A82/A82M, A185/A185M, A496/A496M,A497/A497M have been replaced by Specification A1064/A1064M.5.2 The coating material shall meet the requirements listedin Annex A1. In addition to the requirements of Annex
25、 A1, thecoating material shall have demonstrated long-term stabilitywhen embedded in concrete.5.2.1 A written certification shall be furnished to the pur-chaser that properly identifies the number of each batch ofcoating material used in the order, material quantity repre-sented, date of manufacture
26、, name and address of manufac-turer, and a statement that the supplied coating material meetsthe requirements of Annex A1.5.3 If specified in the order, a representative 8-oz 0.20-kgsample of the coating material shall be supplied to thepurchaser from each batch. The sample shall be packaged in anai
27、rtight container and identified by batch number.5.4 Patching material for repairing damaged coating shall becompatible with the coating, inert in concrete, and feasible forrepairs at the applicator plant or the fabricating shop. Patchingmaterial shall be approved in accordance with Annex A2 priorto
28、use.5.4.1 The patching material manufacturer shall specify themetals surface preparation and the procedures for applicationof the patching material.5.4.2 If specified in the order, patching material conformingto Annex A2 and recommended by the powder coating manu-facturer shall be supplied to the pu
29、rchaser.NOTE 3When subjected to temperatures above 390F 200C for aprolonged period of time, a vinyl coating is subject to decomposition. Oneof the products of decomposition is hydrochloric acid, HCl, which candamage concrete and reinforcing steel. Even in small amounts, HCl willaccelerate corrosion
30、of steel.NOTE 4Vinyl-coated wire has very low bond strength to concrete, andthe use of deformed wire provides no advantage over plain wire. The bondstrength of vinyl-coated welded wire reinforcement is similar to that ofuncoated plain welded wire reinforcement since the cross wires providethe primar
31、y bond.6. Surface Preparation6.1 The surface of the steel wire or welded wire reinforce-ment to be coated shall be cleaned by abrasive blast cleaning tonear-white metal in accordance with SSPC-SP 10. Additionalsurface treatment, as indicated in 6.3, is permitted. Any of thefollowing visual standards
32、 of comparison shall be used todefine the final surface condition: SSPC-Vis 1, SSPC-Vis 2,NACE TM-01-70, and NACE TM-01-75.Average blast profilemaximum roughness depth readings of 1.5 to 4.0 mils 0.04 to0.10 mm as determined by replica tape measurements usingNACE RP-287-87, shall be considered suita
33、ble as an anchorpattern.NOTE 5Abrasive blast cleaning of wire and welded wire reinforce-ment with a high degree (90 %) of grit in the cleaning media provides themost suitable anchor profile for coating adhesion. After grit has beenrecycled, a small portion will take on the appearance of shot.NOTE 6T
34、he use of a profilometer type surface measurement instru-ment which measures the peak count as well as the maximum profile depthis recommended.4Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,Pittsburgh, PA 15222-4656, http:/www.sspc.org.A933/A933M 1026.2 Multidirection
35、al, high-pressure, dry air knives shall beused after blasting to remove dust, grit, and other foreignmatter from the steel surface. The air knives shall not depositoil on the steel reinforcement.NOTE 7It is recommended that incoming wire and welded wirereinforcement and blast media should be checked
36、 for salt contaminationprior to use. Blast media found to be salt contaminated should be rejected.Wire and welded wire reinforcement found to be salt contaminated fromexposure to deicing salts or salt spray should be cleaned by acid washingor other suitable methods to remove salt contaminants from t
37、he surfaceprior to blast cleaning.6.3 It shall be permissible for the manufacturer to use achemical wash or conversion of the blast-cleaned steel rein-forcement surface, or both, to enhance coating adhesion. Thispretreatment shall be applied after abrasive cleaning and beforecoating, in accordance w
38、ith the written application instructionsspecified by the pretreatment manufacturer.7. Application of Coating7.1 The coating shall be applied to the cleaned surface assoon as possible after cleaning, and before oxidation of thesurface occurs discernible to a person with normal or correctedvision. How
39、ever, in no case shall application of the coating bedelayed more than 4 h after cleaning.7.2 To achieve a chemical bond of the vinyl coating tometal, the steel wire or welded wire reinforcement shall beprimed with appropriate primer as recommended by themanufacturer of the primer and vinyl powder co
40、mpound.7.3 The coating shall be applied and fully fused in accor-dance with the written recommendations of the manufacturerof the coating material.8. Requirements for Coated Wire or Welded WireReinforcement8.1 Thickness of Coating:8.1.1 Class AThe film thickness of the coating afterfusing shall be 7
41、 to 17 mils 175 to 425 m for both plain anddeformed steel wire and welded wire reinforcement used forconcrete reinforcement. Thickness measurements below 7 mils175 m shall be considered cause for rejection. The upperfilm thickness limits do not apply to repaired areas of damagedcoating.8.1.2 Class B
42、The film thickness of the coating afterfusing shall be a minimum of 18 mils 450 m, for both plainand deformed steel wire and welded wire reinforcement usedfor earth reinforcement, such as mechanically stabilized em-bankments. Thickness measurements below 18 mils 450 mshall be considered cause for re
43、jection or reclassification asClass A if the thickness meets the Class A requirements.8.1.3 A single recorded coating thickness measurement isthe average of three individual gauge readings obtained ap-proximately evenly spaced along each side of the coated wireor welded wire reinforcement test speci
44、men. A minimum offive recorded measurements shall be taken approximatelyevenly spaced along each side of the test specimen (a minimumof 10 recorded measurements per test specimen). No individualgauge reading shall be taken closer than 0.5 in. 13mm froman intersection.8.1.4 For acceptance purposes, t
45、he average of all coatingthickness measurements shall not be less than the specifiedminimum thickness or more than the specified maximumthickness. No single recorded coating thickness measurementshall be less than 80 % of the specified minimum thickness ormore than 120 % of the specified maximum thi
46、ckness.8.1.5 Measurements shall be made in accordance withSSPC-PA2 following the instructions for calibration and userecommended by the thickness gauge manufacturer. Pull-off orfixed-probe gauges shall be used. Pencil-type pull-off gaugesthat require the operator to observe the reading at the instan
47、tthe magnet is pulled from the surface shall not be used.8.2 Continuity of Coating:8.2.1 There shall not be more than an average of one holidayper foot three holidays per metre on the coated wire (spooland individual lengths).8.2.2 In welded wire reinforcement, there shall not be morethan an average
48、 of one holiday per foot three holidays permetre in each wire direction. Voids (uncoated areas due to thefaraday cage effect and weld spurs) at welded intersectionsshall not be counted. Damage at cut ends shall not be counted.8.2.3 Holiday checks to determine acceptability of the wireor welded wire
49、reinforcement shall be made at the manufac-turers plant with a 6712-V, 80 000 V, wet-sponge-type d-choliday detector.NOTE 8Holiday detection is not intended for use at the job-site.8.3 Bend TestCoating Requirement:8.3.1 The adhesion of the coating shall be evaluated bybending production coated steel wire and welded wire rein-forcement at a uniform rate 180 around a mandrel of specifiedsize as prescribed in Table 1. The test specimens shall be atthermal equilibrium between 68 and 86F 20 and 30C.8.3.2 Cracking or disbonding of th
