ASTM A1055-08

Standard Specification for Zinc and Epoxy Dual Coated Steel Reinforcing Bars

ABSTRACT
This specification covers deformed and plain steel reinforcing bars with a dual coating of zinc alloy and an epoxy coating. The zinc alloy layer shall be applied by the thermal spray coating method followed by an epoxy coating, which shall be applied by the electrostatic spray method. The zinc coating shall conform to the required chemical composition for aluminum, cadmium, copper, iron, lead, tin, antimony, silver, bismuth, arsenic, nickel, magnesium, titanium, and zinc. The coated steel reinforcing bars shall conform to bend test requirements and to physical properties such as coating thickness, coating continuity, epoxy coating flexibility, and coating adhesion.
SCOPE
1.1 This specification covers deformed and plain steel reinforcing bars with a dual coating of zinc alloy and an epoxy coating. The zinc alloy layer is applied by the thermal spray coating method (metallizing) followed by an epoxy coating applied by the electrostatic spray method.
Note 1—The coating applicator is identified throughout this specification as the manufacturer.
1.2 Requirements of the zinc coating are contained in Table 1.
1.3 Requirements for fusion-bonded powder coatings are contained in Annex A1.
1.4 Guidelines for construction practices at the job site are presented in Appendix X1.
1.5 This specification is applicable for orders in either SI units or inch pounds units.
1.6 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 Table 2. Combining values from the two systems may result in nonconformance with this specification.
1.7 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.

General Information

• Status: Historical
• Publication Date: 29-Feb-2008
• ICS: 25.220.40 - Metallic coatings
• ICS: 25.220.60 - Organic coatings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.05 - Steel Reinforcement

Relations

• Replaced By: ASTM A1055/A1055M-08a - Standard Specification for Zinc and Epoxy Dual-Coated Steel Reinforcing Bars
• Effective Date: 01-Oct-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A1055 – 08
Standard Specification for
Zinc and Epoxy Dual Coated Steel Reinforcing Bars
This standard is issued under the fixed designation A1055; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope A706/A706M Specification for Low-Alloy Steel Deformed
and Plain Bars for Concrete Reinforcement
1.1 This specification covers deformed and plain steel
A775/A775M Specification for Epoxy-Coated Steel Rein-
reinforcing bars with a dual coating of zinc alloy and an epoxy
forcing Bars
coating. The zinc alloy layer is applied by the thermal spray
A944 Test Method for Comparing Bond Strength of Steel
coating method (metallizing) followed by an epoxy coating
Reinforcing Bars to Concrete Using Beam-End Specimens
applied by the electrostatic spray method.
A996/A996M Specification for Rail-Steel and Axle-Steel
NOTE 1—The coating applicator is identified throughout this specifica-
Deformed Bars for Concrete Reinforcement
tion as the manufacturer.
B117 Practice for Operating Salt Spray (Fog) Apparatus
1.2 Requirements of the zinc coating are contained in Table
B833 Specification for Zinc and Zinc Alloy Wire for Ther-
1.
mal Spraying (Metallizing) for the Corrosion Protection of
1.3 Requirements for fusion-bonded powder coatings are
Steel
contained in Annex A1.
D4060 Test Method for Abrasion Resistance of Organic
1.4 Guidelines for construction practices at the job site are
Coatings by the Taber Abraser
presented in Appendix X1.
E29 Practice for Using Significant Digits in Test Data to
1.5 This specification is applicable for orders in either SI
Determine Conformance with Specifications
units or inch pounds units.
E527 Practice for Numbering Metals and Alloys in the
1.6 The values stated in either SI or inch-pound units are to
Unified Numbering System (UNS)
be regarded as standard. Within the text, the inch-pound units
G8 Test Methods for Cathodic Disbonding of Pipeline
are shown in brackets.The values stated in each system are not
Coatings
exact equivalents; therefore, each system must be used inde-
G14 Test Method for Impact Resistance of Pipeline Coat-
pendently of the other, except as specifically noted in Table 2.
ings (Falling Weight Test)
Combining values from the two systems may result in noncon-
G20 Test Method for Chemical Resistance of Pipeline
formance with this specification.
Coatings
1.7 This standard does not purport to address all of the
G62 Test Methods for Holiday Detection in Pipeline Coat-
safety concerns, if any, associated with its use. It is the
ings
responsibility of the user of this standard to establish appro-
2.2 American Welding Society:
priate safety and health practices and determine the applica-
ANSI/AWS A5.33 Specification for Solid and Ceramic
bility of regulatory limitations prior to use.
Wires and Ceramic Rods for Thermal Spraying
AWS C2.23M/C2.23 Specification for the Application of
2. Referenced Documents
Thermal Spray Coatings (Metallizing) of Aluminum,
2.1 ASTM Standards:
Zinc, and Their Alloys and Composites for the Corrosion
A615/A615M Specification for Deformed and Plain
Protection for Steel
Carbon-Steel Bars for Concrete Reinforcement
AWS C2.25/C2.25M Specification for Thermal Spray
Feedstock—Solid and CompositeWire and Ceramic Rods
2.3 NACE International Standard:
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
RP-287 Field Measurement of Surface Profile of Abrasive
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement. Blast-Cleaned Steel Surface Using a Replica Tape
Current edition approved March 1, 2008. Published April 2008. DOI: 10.1520/
A1055-08.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Miami, FL 33126, http://www.aws.org.
Standards volume information, refer to the standard’s Document Summary page on Available from National Association of Corrosion Engineers (NACE), 1440
the ASTM website. South Creek Dr., Houston, TX 77084-4906, http://www.nace.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A1055 – 08
TABLE 1 Chemical Composition Requirements for Zinc and Zinc Alloy Wires
Al,
Common Name Cd, Cu, Fe, Pb, Sn, Sb, Ag, Bi, As, Ni, Mg, Mo, Ti, Zn, Other,
max
A
(UNS) max max max max max max max max max max max max max min Total max
unless noted
B
99.99 Zinc
C D
0.002 0.003 0.005 0.003 0.003 0.001 … … … … … … … … 99.99 …
(Z13005)
B
99.99 Zinc
0.01 0.02 0.02 0.02 0.03 … … … … … … … … … 99.9 0.10 total non-Zn
(Z15005)
99.995 Zinc
0.001 0.003 0.001 0.002 0.003 0.003 … … … … … … … … 99.995 0.005
E
(…)
99.95 Zinc
0.01 0.02 0.001 0.02 0.03 0.001 … … … … … … … … 99.95 0.050
(…)
99.95 Zinc
0.01 0.005 0.7 0.01 0.005 0.001 … … … … … 0.01 0.01 0.18 99 1.0
(…)
98Zn/2Al
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 …
(Z30402)
A
UNS designations were established in accordance with Practice E527.
B
In accordance with ANSI/AWS A5.33.
C
The following applies to all specified limits in this table. For the purposes of determining conformance with this specification, an observed value obtained from analysis
shall 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 the element is not applicable.
E
(…) indicates no Unified Numbering System (UNS) designation for this option.
TABLE 2 Bend Test Requirements
3.1.2 fusion-bonded powder coating, n—a product contain-
A615/A615M, A706/A706M, A615/A615M, A706/A706M, ing pigments, thermosetting resins, cross-linking agents, and
Bend Angle
or A996/A996M or A996/A996M
Time to other additives, which is applied in the form of a powder onto
(After
Completion
Mandrel Mandrel
Rebound, a clean, heated metallic substrate and fused to form a continu-
Bar Bar
max, s
Diameter Diameter
degrees)
No. No. ous barrier coating.
A A
mm in.
3.1.3 holiday, n—a discontinuity in a coating that is not
10 75 3 3 180 15
discernible to a person with normal or corrected vision.
13 100 4 4 180 15
16 125 5 5 180 15
3.1.4 patching material, n—a liquid two–part, epoxy coat-
19 150 6 6 180 15
ing used to repair damaged or uncoated areas.
20 175 7 7 180 45
3.1.5 thermal spray coating (metallizing), n—a zinc and
25 200 8 8 180 45
29 230 9 9 180 45
zinc alloy, or both, wire used in depositing a metallized layer
32 250 10 10 180 45
of zinc by thermal spraying (metallizing) using oxy-fuel or
36 280 11 11 180 45
43 430 14 17 90 45 electric arc thermal spraying which is applied onto a clean,
57 580 18 23 90 45
heated metallic substrate to form a continuous coating.
A
Mandrel diameters specified for similar size (shown on the same line) metric
3.1.6 wetting agent, n—a material that lowers the surface
and inch-pound bars may be interchanged.
tension of water allowing it to penetrate more effectively into
small discontinuities in the coating giving a more accurate
2.4 Society for Protective Coatings Specifications:
indication of the holiday count.
SSPC-PA 2 Measurement of Dry Coating Thickness with
Magnetic Gages
4. Ordering Information
SSPC-SP 10 Near-White Blast Cleaning
4.1 It shall be the responsibility of the purchaser to specify
SSPC-VIS 1 Pictorial Surface Preparation standards for
all requirements that are necessary for the coated steel rein-
Painting Steel Surfaces
6 forcing bars under this specification. Such requirements to be
2.5 Concrete Reinforcing Steel Institute:
considered include but are not limited to the following:
Voluntary Certification Program for Fusion Bonded Epoxy
4.1.1 Reinforcing bar specification and year of issue,
Coating Applicator Plants
4.1.2 Quantity of bars,
2.6 American Concrete Institute Standard:
4.1.3 Size and grade of bars,
ACI 301 Specifications for Structural Concrete
4.1.4 Requirements for the zinc coating (5.2),
3. Terminology
4.1.5 Requirements for the powder coating and provision of
3.1 Definitions of Terms Specific to This Standard:
test data (5.3 and 5.4),
3.1.1 disbonding, n—loss of adhesion between the fusion-
4.1.6 Requirements for patching material (5.5),
bonded powder coating and the zinc coated steel reinforcing
4.1.7 Quantity of patching material,
bar.
4.1.8 Specific requirements for test frequency (9.1),
4.1.9 Whether a report on tests performed on the coated
steel reinforcing bars being furnished is required (8.4.1 and
Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,
Pittsburgh, PA 15222-4656, http://www.sspc.org.
Section 14),
Available from Concrete Reinforcing Steel Institute (CRSI), 933 North Plum
4.1.10 Additionalspecimenstobeprovidedtothepurchaser
Grove Rd., Schaumburg, IL 60173-4767, http://www.crsi.org.
for testing from the coated steel reinforcing bars being fur-
Available fromAmerican Concrete Institute (ACI), P.O. Box 9094, Farmington
Hills, MI 48333-9094, http://www.aci-int.org. nished (12.1), and
A1055 – 08
4.1.11 Manufacturer qualification and certification require- The powder coating shall be used within the powder coating
ments (if any). manufacturer’s written recommended shelf life.
5.4 If specified in the order, a representative 0.2-kg [8-oz]
NOTE 2—Itisrecommendedthatthecoatingapplicationproceduresand
sampleofthepowdercoatingshallbesuppliedtothepurchaser
processes be audited by an independent certification program for coating
from each batch. The sample shall be packaged in an airtight
applicator plants such as that provided by the Voluntary Certification
container and identified by batch number.
Program or equivalent.
5.5 If specified in the order, patching material compatible
5. Materials
withthecoating,inertinconcrete,andapprovedbythepowder
coating manufacturer, shall be supplied to the purchaser.
5.1 Steel reinforcing bars to be coated shall meet the
requirements of one of the following specifications: A615/
6. Surface Preparation
A615M, A706/A706M,or A996/A996M [A615/A615M,
6.1 The surface of the steel reinforcing bars to be coated
A706/A706M,or A996/A996M] as specified by the purchaser
shall be cleaned by abrasive blast cleaning to near-white metal
and shall be free of contaminates such as oil, grease, or paint.
in accordance with SSPC-SP10.The following visual standard
NOTE 3—Priortocoating,thesteelreinforcingbarsshouldbeinspected
of comparison may be used to define the final surface condi-
fortheirsuitabilityforcoating.Barswithsharpedgesonthedeformations,
tion: SSPC-VIS 1. Average blast profile maximum roughness
rolled-in slivers, or other surface imperfections are difficult to coat
depth readings of 0.04 to 0.10 mm [1.5 to 4.0 mils] as
properly and should not be coated. The coating will flow away from the
determined by replica tape measurements using NACE RP-
sharpedgesandmayresultininadequatecoatingthicknessatthesepoints.
287, shall be considered suitable as an anchor pattern.
5.2 Zinc Alloy Wire:
NOTE 4—The use of a “profilometer”-type surface measurement instru-
5.2.1 The thermal spray coating feedstock material shall be
ment that measures the peak count as well as the maximum profile depth
specified according to Specification B833, Standard for Zinc
is recommended.
and Zinc Alloy Wire for Thermal Spraying (Metallizing) for
NOTE 5—Abrasive blast cleaning of steel reinforcing bars with a high
the Corrosion Protection of Steel, or to AWS C2.25/C2.25M,
degree (>90 %) of grit in the cleaning media provides the most suitable
Specification for Thermal Spray Feedstock—Solid and Com- anchor profile for coating adhesion. After grit has been recycled, a small
portion will take on the appearance of shot.
posite Wire and Ceramic Rods.
5.2.2 The wire shall conform to one of the chemical
6.2 Multidirectional, high pressure dry air knives shall be
composition requirements prescribed in Table 1.
used after blasting to remove dust, grit, and other foreign
matterfromtheblast-cleanedsteelsurface.Theairknivesshall
5.2.3 Thewireshallbecleanandfreeofcorrosion,adhering
foreign material, scale, seams, nicks, burrs, and other defects not deposit oil on the steel reinforcing bars.
which would interfere with the operation of thermal spraying
NOTE 6—It is recommended that incoming steel reinforcing bars and
equipment. The wire shall uncoil readily and be free of bends
blast media be checked for salt contamination prior to use. Blast media
or kinks that would prevent its passage through the thermal
found to be salt contaminated should be rejected. Steel reinforcing bars
spray gun. found to be salt contaminated from exposure to deicing salts or salt spray
should be cleaned by acid washing or other suitable methods to remove
5.2.4 The wire shall be a continuous length per spool, coil,
salt contaminants from the surface prior to blast cleaning.
or drum. Splices or welds are permitted, provided that they do
not interfere with the thermal spray equipment or coating
7. Coating Application
process.
7.1 Athin zinc alloy layer shall be applied by a thermal arc
5.2.5 The starting end of each coil shall be tagged to
spray (metallization) system directly after the blast cleaning
indicate winding direction and to be readily identifiable with
and before the powder coating in accordance with
ASTM designation.
AWS C2.23M/C2.23 and the written specification of the zinc
5.3 Powder Coating:
alloy supplier.
5.3.1 The powder coating shall meet the requirements of
7.1.1 Thermal spray equipment shall be set up, calibrated,
AnnexA1. Upon request, the purchaser shall be provided with
and operated according to the manufacturer’s instructions and
the test report for review.
technical manuals or the Thermal Coating Spray applicator’s
5.3.2 A written certification shall be furnished to the pur-
recommendation.
chaserthatproperlyidentifiesthenumberofeachlotofpowder
7.2 The zinc alloy coating shall be applied to the cleaned
coating used in the order material quantity represented, date
steel reinforcing bar surface as soon as possible after the bar
manufacture, name and address of the powder coating manu-
has been cleaned and before visible oxidation of the surface
facturer,andastatementthatthesuppliedpowdercoatingisthe
occurs as discernible to a person with normal or corrected
same composition as that qualified according to Annex A1 of
vision. In no case shall application of the coating be delayed
this specification.
more than 30 minutes a
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