1、Designation: A884/A884M 12A884/A884M 14Standard Specification forEpoxy-Coated Steel Wire and Welded Wire Reinforcement1This standard is issued under the fixed designation A884/A884M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision,
2、the year of last 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 wire and plain and deformed steel welded wire reinforc
3、ement withprotective epoxy coating. A Class A minimum coating thickness is required for wire and welded wire reinforcement intended foruse in concrete and masonry. A Class B minimum coating thickness is required for wire and welded wire reinforcement intendedfor use in mechanically stabilized earth
4、applications. AType 1 coating is a fusion-bonded epoxy coating that has been formulatedto be sufficiently flexible to allow bending of the coated wire or welded wire reinforcement. A Type 2 coating is a fusion-bondedepoxy coating that has not been designed to be sufficiently flexible to allow bendin
5、g of the coated wire or welded wirereinforcement.NOTE 1The coating applicator is identified throughout this specification as the manufacturer.1.2 This specification is applicable for orders in either inch-pound units (as Specification A884) or SI units (as SpecificationA884M).1.3 The values stated i
6、n either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units areshown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be usedindependently of the other except as specifically noted in Table 1. Combin
7、ing values from the two systems may result innon-conformance with this specification.1.4 This specification does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this specification to establish appropriate safety and health pr
8、actices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A82/A82M Specification for Steel Wire, Plain, for Concrete Reinforcement (Withdrawn 2013)3A185/A185M Specification for Steel Welded Wire Reinforcement, Plain, for Concrete (Withdr
9、awn 2013)3A496/A496M Specification for Steel Wire, Deformed, for Concrete Reinforcement (Withdrawn 2013)3A497/A497M Specification for Steel Welded Wire Reinforcement, Deformed, for Concrete (Withdrawn 2013)3A775/A775M Specification for Epoxy-Coated Steel Reinforcing BarsA934/A934M Specification for
10、Epoxy-Coated Prefabricated Steel Reinforcing BarsA1064/A1064M Specification for Carbon-Steel Wire and Welded Wire Reinforcement, Plain and Deformed, for ConcreteD4417 Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel2.2 Society for Protective Coatings Specifications:3SSPC-
11、PA2 Measurement of Dry Coating Thickness with Magnetic GaugesSSPC-SP 10 Near-White Blast CleaningSSPC-VIS 1 Pictorial Surface Preparation Standards for Painting Steel Surfaces2.3 American Concrete Institute Specification:4ACI 301 Specifications for Structural Concrete1 This specification is under th
12、e jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.05on Steel Reinforcement.Current edition approved May 15, 2012May 1, 2014. Published June 2012May 2014. Originally approved in 1988. Last previous edition approved in
13、20062012 asA884/A884M 06.A884/A884M 12. DOI: 10.1520/A0884_A0884M-12.10.1520/A0884_A0884M-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document S
14、ummary page on the ASTM website.3 Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor, Pittsburgh, PA 15222-4656, http:/www.sspc.org.4 Available from American Concrete Institute (ACI), P.O. Box 9094, Farmington Hills, MI 48333-9094, http:/www.aci-int.org.This document is no
15、t an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriat
16、e. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States12.
17、4 Concrete Reinforcing Steel Institute:5CRSI “Voluntary Certification Program for Fusion Bonded Epoxy Coating Applicator Plants”3. Terminology3.1 Definitions:3.1.1 disbonding, nloss of adhesion between the fusion-bonded epoxy coating and the steel reinforcement.3.1.2 fusion-bonded epoxy coating, na
18、product containing pigments, thermosetting epoxy resins, crosslinking agents, andother additives. It is applied in the form of a powder on a clean, heated, metallic substrate and fuses to form a continuous barriercoating.3.1.3 holiday, na discontinuity in a coating that is not discernible to a perso
19、n with normal or corrected vision.3.1.4 patching material, na liquid, two-part epoxy coating compatible with the Type I or Type II coatings used to repairdamaged or uncoated areas.3.1.5 pretreatment, na preparation of the blast-cleaned steel surface prior to coating application that is designed to p
20、retreatthe metal to promote coating adhesion, reduce metal/coating reactions, improve corrosion resistance, and increase blisterresistance.3.1.6 wetting agent, na material that lowers the surface tension of water, allowing it to penetrate more effectively into smalldiscontinuities in the coating, gi
21、ving a more accurate indication of the holiday count.4. Ordering Information4.1 It shall be the responsibility of the purchaser to specify all requirements that are necessary for the coated wire and weldedwire reinforcement under this specification. Such requirements to be considered include, but ar
22、e not limited to, the following:4.1.1 Wire or welded wire reinforcement specification and year of issue,4.1.2 Wire size,4.1.3 Wire spacing and sizes, if welded wire reinforcement,4.1.4 Length and width of sheets or rolls,4.1.5 Quantity,4.1.6 Class and type of coating (1.1),4.1.7 Requirements for the
23、 epoxy powder coating and provision of test data (5.2 and 5.3),4.1.8 Requirements for patching material (5.4),4.1.9 Quantity of patching material (5.4.2),4.1.10 Requirements for steel pretreatment (6.3),4.1.11 Specific requirements for test frequency (9.1),4.1.12 Additional specimens to be provided
24、to the purchaser for testing from the coated wire or welded wire reinforcementbeing furnished (12.1),4.1.13 Whether a report on tests performed on the coated wire or welded wire reinforcement being furnished is required (15.2),and4.1.14 Manufacturer qualification and certification requirements (if a
25、ny).NOTE 2It is recommended that the coating application procedures and processes be audited by an independent certification program for epoxy coatingapplicators plants, such as that provided by Concrete Reinforcing Steel Institute (CRSI), or equivalent.5 Available from Concrete Reinforcing Steel In
26、stitute (CRSI), 933 N. Plum Grove Rd. Schaumburg, IL 60173-4758, http:/www.crsi.org.TABLE 1 Best Test RequirementsWire SizeNo.W or DWire Size No.MW or MD Mandrel DiameterTime toComplete, smaximum1.4 to 6 9 to 39 Two times the diameterof the wirebeing tested(2d)A156 39 Four times thediameter of thewi
27、re being tested(4d)A45A d = nominal diameter of wire.A884/A884M 1425. Materials5.1 Plain or deformed steel wire or welded wire reinforcement to be coated shall meet the requirements the applicableSpecifications of Specification A82/A82M, A185/A185M, A496/A496M, A497/A497M, or A1064/A1064M as specifi
28、ed by thepurchaser and shall be free of surface contaminants such as oil, grease, or paint when received at the manufacturers plant and priorto cleaning and coating.5.2 Type 1 coatings shall meet the requirements of and shall be qualified in accordance with Annex A1 of SpecificationA775/A775M. Type
29、2 coatings shall meet the requirements of and shall be qualified in accordance withAnnexA1 of SpecificationA934/A934M. Upon request, the purchaser shall be provided with data demonstrating that these products meet the specifications.5.2.1 A written certification shall be furnished to the purchaser t
30、hat properly identifies the designation of each lot of powdercoating used in the order, material quantity represented, date of manufacture, name and address of the powder coatingmanufacturer, and a statement that the supplied powder coating is the same composition as that qualified in accordance wit
31、h 5.2.5.2.2 The powder coating shall be stored in a temperature-controlled environment in accordance with the written recommen-dations of the powder coating manufacturer until ready for use.At this point, if the storage temperature is below the plant ambienttemperature, the powder coating shall be g
32、iven sufficient time to reach approximate plant ambient temperature. The powder coatingshall be used within the powder coating manufacturers written recommended shelf life.5.3 If specified in the order, a representative 8 oz 0.2 kg sample of the powder coating shall be supplied to the purchaser from
33、each batch. The sample shall be packaged in an airtight container and identified by batch number.5.4 Patching material for repairing damaged coating shall be compatible with the coating, inert in concrete, and formulated foruse at coating applicator plants, fabrication shops and job-sites. Patching
34、material for Type I coatings shall meet requirements ofSpecification A775/A775M. Patching material for Type II coatings shall meet requirements of Specification A934/A934M.5.4.1 The patching material manufacturer shall specify the steel surface preparation, the coating thickness and the proceduresfo
35、r application of the patching material.5.4.2 If specified in the order, patching material shall be supplied to the purchaser.6. Surface Preparation6.1 The surface of the steel wire or welded wire reinforcement to be coated shall be cleaned by abrasive blast cleaning tonear-white metal in accordance
36、with SSPC-SP 10. The final surface condition shall be defined according to SSPC-VIS 1. Averageblast profile maximum roughness depth readings of 1.5 to 4.0 mils 40 to 100 m as determined by the use of a profilometer typesurface measurement instrument that measures the peak count as well as the maximu
37、m profile depth, according to Test MethodsD4417, Method B, or as determined by replica tape measurements using Test Methods D4417, Method C, shall be considered asuitable method to measure the anchor pattern.NOTE 3Abrasive blast cleaning of wire and welded wire reinforcement with a high degree ( 90
38、%) of grit in the cleaning media provides the mostsuitable anchor profile for coating adhesion. After grit has been recycled, a small portion of it will take on the appearance of shot.6.2 Multidirectional, high-pressure, dry air knives shall be used after blast cleaning to remove dust, grit, and oth
39、er foreign matterfrom the steel surface. The air knives shall not deposit oil on the steel reinforcement.NOTE 4It is recommended that incoming wire and welded wire reinforcement and blast media should be checked for salt contamination prior to use.Blast media found to be salt contaminated should be
40、rejected. Wire and welded wire reinforcement found to be salt contaminated from exposure to deicingsalts or salt spray should be cleaned by acid washing or other suitable methods to remove salt contaminants from the surface prior to blast cleaning.6.3 Pretreatment of the blast-cleaned steel reinforc
41、ement surface by the manufacturer is required when specified by thepurchaser. This pretreatment shall be applied after abrasive cleaning and before coating, in accordance with the written applicationinstructions specified by the pretreatment manufacturer.7. Coating Application7.1 The powder coating
42、shall be applied to the cleaned and pretreated (if used) surface within 3 hours after surface treatmentshave been completed, and before visible oxidation of the surface occurs discernible to a person with normal or corrected vision.7.2 The fusion-bonded epoxy powder coating shall be applied in accor
43、dance with the written recommendations of themanufacturer of the powder coating for initial steel surface temperature range and post-application cure requirements. Duringcontinuous operations, the temperature of the surface immediately prior to coating shall be measured using infrared guns ortempera
44、ture-indicating crayons, or both, at least once every 30 min.NOTE 5The use of infrared and temperature-indicating crayon measurement of the reinforcement is recommended.7.3 The coating shall be applied by electrostatic spray or other suitable method.8. Requirements for Coated Wire or Welded Wire Rei
45、nforcement8.1 Coating Thickness:8.1.1 Class AThe coating thickness measurements after curing shall be 7 mils 175 m.A884/A884M 1438.1.2 Class BThe coating thickness measurements after curing shall be 18 mils 450 m, for both plain and deformedwelded wire reinforcement for use in mechanically stabilize
46、d earth applications.8.1.3 Asingle recorded coating thickness measurement is the average of three individual gauge readings obtained approximatelyevenly spaced along each side of the coated wire or welded wire reinforcement test specimen. A minimum of five recordedmeasurements shall be taken approxi
47、mately evenly spaced along each side of the test specimen (a minimum of 10 recordedmeasurements per test specimen). No individual gauge reading shall be taken closer than 0.5 in. 13 mm from an intersection.8.1.4 For acceptance purposes, the average of all coating thickness measurements shall not be
48、less than the specified minimumthickness. No single coating thickness measurement shall be less than 80 % of the specified minimum thickness. Any individualgauge reading may be under-run by a greater amount.8.1.5 Measurements shall be made in accordance with SSPC-PA2 following the instructions for c
49、alibration and userecommended by the thickness gage manufacturer. Pull-off or fixed-probe gages shall be used. Pencil-type pull-off gages thatrequire the operator to observe the reading at the instant the magnet is pulled from the surface shall not be used.8.2 Coating Continuity:8.2.1 There shall not be more than an average of one holiday per foot three holidays per metre on the coated wire (spool andindividual lengths).8.2.2 In welded wire reinforcement, there shall not be more than an average of one holiday per foot three holidays per
