ASTM A884/A884M-00
(Specification)Standard Specification for Epoxy-Coated Steel Wire and Welded Wire Fabric for Reinforcement
Standard Specification for Epoxy-Coated Steel Wire and Welded Wire Fabric for Reinforcement
SCOPE
1.1 This specification covers plain and deformed steel wire and plain and deformed steel welded wire fabric with protective epoxy coating. A Class A minimum coating thickness is required for wire and welded wire fabric intended for use as reinforcement in concrete and masonry. A Class B minimum coating thickness is required for wire and welded wire fabric intended for use as reinforcement in earth. A Type 1 coating is a fusion-bonded epoxy coating that has been designed to be sufficiently flexible to allow fabrication of the coated wire or welded wire fabric. A Type 2 coating is a fusion-bonded epoxy coating that has not been designed to be sufficiently flexible to allow fabrication of the coated wire or welded wire fabric.
Note 1--The coating applicator is identified throughout this specification as the manufacturer.
1.2 Other organic coatings may be used provided they meet the requirements of this specification.
1.3 This specification is applicable for orders in either SI units (Specification A884M) or in inch-pound units [Specification A884].
1.4 The values stated in either SI or inch-pound units are to be regarded as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other except as specifically noted in . Combining values from the two systems may result in nonconformance with this specification.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A 884/A 884M – 00
Standard Specification for
Epoxy-Coated Steel Wire and Welded Wire Fabric for
Reinforcement
This standard is issued under the fixed designation A 884/A 884M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
TABLE 1 Test Requirements
1. Scope
Wire Size No. Wire Size Mandrel Diameter, Time to
1.1 This specification covers plain and deformed steel wire
MW or MD, No. mm [in.] Complete, s
and plain and deformed steel welded wire fabric with protec-
mm WorD,in. (maximum)
6.5 to 39 1 to 6 twice the diameter 15
tive epoxy coating. A Class A minimum coating thickness is
of the wire
required for wire and welded wire fabric intended for use as
being tested
reinforcement in concrete and masonry. A Class B minimum
>39 >6 four times the 45
diameter of the
coating thickness is required for wire and welded wire fabric
wire being tested
intended for use as reinforcement in earth. A Type 1 coating is
a designation of fusion-bonded epoxy coating that has been
designed to be sufficiently flexible to allow fabrication of the
coated wire or welded wire fabric. A Type 2 coating is a
A 82 Specification for Steel Wire, Plain, for Concrete Re-
designation of fusion-bonded epoxy coating that has not been
inforcement
designed to be sufficiently flexible to allow fabrication of the
A 185 Specification for Steel Welded Wire Fabric, Plain, for
coated wire or welded wire fabric.
Concrete Reinforcement
NOTE 1—The coating applicator is identified throughout this specifica- A 496 Specification for Steel Wire, Deformed, for Concrete
tion as the manufacturer.
Reinforcement
A 497 Specification for Steel Welded Wire Fabric, De-
1.2 Other organic coatings may be used provided they meet
formed, for Concrete Reinforcement
the requirements of this specification.
A 775/A 775M Specification for Epoxy-Coated Steel Rein-
1.3 This specification is applicable for orders in either SI
forcing Bars
units (Specification A 884M) or in inch-pound units [Specifi-
A 934/A 934M Specification for Epoxy-Coated Prefabri-
cation A 884].
cated Steel Reinforcing Bars
1.4 The values stated in either SI or inch-pound units are to
G 12 Test Method for Nondestructive Measurement of Film
be regarded as standard. Within the text, the inch-pound units
Thickness of Pipeline Coatings on Steel
are shown in brackets. The values stated in each system are not
2.2 NACE International Standard:
exact equivalents; therefore, each system must be used inde-
RP-287-87 Field Measurement of Surface Profile of Abra-
pendently of the other except as specifically noted in Table 1.
sive Blast-Cleaned Steel Surface Using a Replica Tape
Combining values from the two systems may result in noncon-
2.3 Society for Protective Coatings Specifications:
formance with this specification.
SSPC-SP 10 Near-White Blast Cleaning
1.5 This standard does not purport to address all of the
SSPC-VIS 1 Pictorial Surface Preparation Standards for
safety concerns, if any, associated with its use. It is the
Painting Steel Surfaces
responsibility of the user of this standard to establish appro-
2.4 Naval Facility Guide Specification:
priate safety and health practices and determine the applica-
NFGS 03201 Manufacture of Prefabricated Epoxy-Coated
bility of regulatory limitations prior to use.
Rebar for Oceans and Other Severe Environments
2. Referenced Documents
2.5 American Concrete Institute Specification:
2.1 ASTM Standards:
Annual Book of ASTM Standards, Vol 01.04.
1 3
This specification is under the jurisdiction of ASTM Committee A-1 on Steel, Annual Book of ASTM Standards, Vol 06.02.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee Available from NACE International, 1440 South Creek, Houston, TX 77084.
A01.05 on Steel Reinforcement. Available from Society for Protective Coatings, 40 24th Street, Pittsburgh,
Current edition approved Oct. 10, 2000. Published January 2001. Originally PA 15222.
published as A 884– 88. Last previous edition approved A 884/A 884M – 99. Available from NFESC, 560 Center Drive, Port Hueneme, CA 93043.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
A 884/A 884M
steel welded wire fabric, deformed with Class A Type 2 coating for use as
ACI 301 Specifications for Structural Concrete
concrete reinforcement and produced to Specification A 884/
3. Terminology A 884M_____ including written certifications for the powder coating and
coated welded wire fabric, and 1 L [1 qt] of patching material.
3.1 Definitions of Terms Specific to This Standard:
3.1.1 conversion coating, n—a preparation of the blast-
5. Materials
cleaned steel surface prior to coating application that is
5.1 Plain or deformed steel wire or welded wire fabric to be
designed to pretreat the metal to promote coating adhesion,
coated shall meet the requirements of one of the applicable
reduce metal/coating reactions, improve corrosion resistance,
Specifications A 82, A 185, A 496, or A 497 as specified by the
and increase blister resistance.
purchaser and shall be free of surface contaminants such as oil,
3.1.2 disbonding, n—loss of adhesion between the fusion-
grease, or paint when received at the manufacturer’s plant and
bonded epoxy coating and the steel reinforcement.
prior to cleaning and coating.
3.1.3 fusion-bonded epoxy coating, n—a product containing
5.2 Type 1 coatings shall meet the requirements of and shall
pigments, thermosetting epoxy resins, crosslinking agents, and
be qualified in accordance with Annex A1 of Specification
other additives. It is applied in the form of a powder on a clean,
A 775/A 775M. Type 2 coatings shall meet the requirements of
heated, metallic substrate and fuses to form a continuous
and shall be qualified in accordance with Annex A1 of
barrier coating.
Specification A 934/A 934M.
3.1.4 holiday, n—a discontinuity in a coating that is not
5.2.1 A written certification shall be furnished to the pur-
discernible to a person with normal or corrected vision.
chaser that properly identifies the designation of each lot of
3.1.5 patching material, n—a liquid, two-part epoxy coat-
powder coating used in the order, material quantity repre-
ing used to repair damaged or uncoated areas.
sented, date of manufacture, name and address of the powder
3.1.6 wetting agent, n—a material that lowers the surface
coating manufacturer, and a statement that the supplied powder
tension of water, allowing it to penetrate more effectively into
coating is the same composition as that qualified in accordance
small discontinuities in the coating, giving a more accurate
with 5.2.
indication of the holiday count.
5.2.2 The powder coating shall be stored in a temperature-
controlled environment following the written recommenda-
4. Ordering Information
tions of the powder coating manufacturer until ready for use.
4.1 It shall be the responsibility of the purchaser to specify
At this point, if the storage temperature is below the plant
all requirements that are necessary for the coated wire and
ambient temperature, the powder coating shall be given suffi-
welded wire fabric under this specification. Such requirements
cient time to reach approximate plant ambient temperature.
to be considered include, but are not limited to, the following:
The powder coating shall be used within the powder coating
4.1.1 Wire or welded wire fabric specification and year of
manufacturer’s written recommended shelf life.
issue,
5.3 If specified in the order, a representative 0.2 kg [8 oz]
4.1.2 Wire size,
sample of the powder coating shall be supplied to the purchaser
4.1.3 Wire spacing and sizes, if welded wire fabric,
from each batch. The sample shall be packaged in an airtight
4.1.4 Length and width of sheets or rolls,
container and identified by batch number.
4.1.5 Quantity, and
5.4 If specified in the order, patching material, compatible
4.1.6 Class and type of coating,
with the coating and inert in concrete, and recommended by the
4.1.7 Requirements for the epoxy powder coating and
coating manufacturer shall be supplied to the purchaser.
provision of test data (5.2 and 5.3),
6. Surface Preparation
4.1.8 Requirements for patching material (5.4),
4.1.9 Quantity of patching material,
6.1 The surface of the steel wire or welded wire fabric to be
4.1.10 Specific requirements for test frequency (9.1),
coated shall be cleaned by abrasive blast cleaning to near-white
4.1.11 Additional specimens to be provided to the purchaser
metal in accordance with SSPC−SP10. The final surface
for testing from the coated wire or welded wire fabric being
condition shall be defined according to SSPC-VIS 1. Average
furnished (12.1),
blast profile maximum roughness depth readings of 40 to 100
4.1.12 Whether a report on tests performed on the coated
μm [1.5 to 4.0 mils] as determined by replica tape measure-
wire or welded wire fabric being furnished is required (15.2),
ments using NACE RP-287-87 shall be considered suitable as
and
an anchor pattern.
4.1.13 Manufacturer qualification and certification require-
NOTE 4—Abrasive blast cleaning of wire and welded wire fabric with
ments (if any).
a high degree (> 90 %) of grit in the cleaning media provides the most
NOTE 2—It is recommended that the manufacturing procedures and suitable anchor profile for coating adhesion. After grit has been recycled,
processes be audited by an independent certification program for epoxy a small portion will take on the appearance of shot.
coating applicators plants, such as that provided by the Navy Facility NOTE 5—The use of a profilometer type surface measurement instru-
Guide Specification or equivalent. ment which measures the peak count as well as the maximum profile depth
NOTE 3—A typical ordering description is as follows: 150 sheets, fabric is recommended.
style 150 by 300 MD 45 by MD 26 [6 by 12 D 7 by D 4] epoxy-coated
6.2 Multidirectional, high-pressure, dry air knives shall be
used after blasting to remove dust, grit, and other foreign
matter from the steel surface. The air knives shall not deposit
Available from the American Concrete Institute, 38800 International Way, P.O.
Box 9094, Farmington Hills, MI 48333-9094. oil on the steel reinforcement.
A 884/A 884M
NOTE 6—It is recommended that incoming wire and welded wire fabric
(spool and individual lengths).
and blast media should be checked for salt contamination prior to use.
8.2.2 In welded wire fabric, there shall not be more than an
Blast media found to be salt contaminated should be rejected. Wire and
average of 18 holidays per metre [6 holidays per linear foot]
welded wire fabric found to be salt contaminated from exposure to deicing
when the wire spacing is 100 mm [4 in.] or less, and there shall
salts or salt spray should be cleaned by acid washing or other suitable
not be more than an average of 12 holidays per metre [4
methods to remove salt contaminants from the surface prior to blast
holidays per foot] when the wire spacing is greater than 100
cleaning.
mm [4 in.]. When measuring the number of holidays, at least
6.3 It shall be permissible for the manufacturer to use a
13 mm [0.5 in.] of wire shall be included on each side of the
chemical wash or conversion of the blast-cleaned steel rein-
intersection being checked. Damage at cut ends shall not be
forcement surface, or both, to enhance coating adhesion. This
counted. Voids (uncoated areas) at welded intersections shall
pretreatment shall be applied after abrasive cleaning and before
be counted. If more than one void is present within 13 mm [0.5
coating, in accordance with the written application instructions
in.] of the intersection area, it shall be counted as one void.
specified by the pretreatment manufacturer.
8.2.3 Holidays checks to determine acceptability of the wire
7. Coating Application or welded wire fabric shall be made at the manufacturer’s plant
with a 67 ⁄2-V, 80 000–V, wet-sponge-type dc holiday detector.
7.1 The powder coating shall be applied to the cleaned and
pretreated (if used) surface as soon as possible after surface
NOTE 8—Holiday detection is not intended for use at the job site.
treatments have been completed, and before visible oxidation
8.3 Bend Test—Type 1 Coating Requirement Only:
of the surface occurs discernible to a person with normal or
8.3.1 The flexibility of the coating shall be evaluated by
corrected vision. In no case shall application of the coating be
bending production coated steel wire and welded wire fabric at
delayed more than 3 h after cleaning.
a uniform rate 180° (after rebound) around a mandrel of
7.2 The fusion-bonded epoxy powder coating shall be
specified size as prescribed in Table 1. The test specimens shall
applied in accordance with the written recommendations of the
be between 20 and 30°C [68 and 86°F].
manufacturer of the powder coating for initial steel surface
8.3.2 No cracking or disbonding of the coating on the
temperature range and post-application cure requirements.
outside radius of bent wire or welded wire fabric shall be
During continuous operations, the temperature of the surface
visible to the unaided eye. Except as specified in 10.1, evidence
immediately prior to coating shall be measured using infrared
of cracking or disbonding of the coating shall be considered
guns or temperature-indicating crayons, or both, at least once
cause for rejection of the coated wire or fabric represented by
every 30 min.
the bend test sample.
NOTE 7—The use of infrared and temperature-indicating crayon mea-
8.4 Place of Testing—Testing of coated steel wire or welded
surement of the reinforcement is recommended.
wire fabric shall be done at the manufacturer’s plant prior to
7.3 The coating shall be applied by electrostatic spray or
shipment.
other suitable method.
8.5 Time of Testing—The requirements for coated wire or
welded wire fabric shall be met at the manufacturer’s plant
8. Requirements for Coated Wire or Welded Wire Fabric
prior to shipment.
8.1 Coating Thickness:
8.1.1 Class A—Coating thickness measurements after cur-
9. Number of Tests
ing shall be greater than or equal to 175 μm [7 mils]. A finding
9.1 The purchaser shall have the option to specify the
that more than5%ofthe coating thickness measurements are
sampling and test schedule for the number and frequency of
below 125 μm [5 mils] shall be considered cause for rejection.
tests for coating thickness, flexibility, and continuity.
8.1.2 Class B—For acceptance purpo
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