ASTM A775/A775M-07b(2014)
(Specification)Standard Specification for Epoxy-Coated Steel Reinforcing Bars
Standard Specification for Epoxy-Coated Steel Reinforcing Bars
ABSTRACT
This specification covers deformed and plain steel reinforcing bars with protective epoxy coating applied by the electrostatic spray method. The surface of the steel reinforcing bars to be coated shall be cleaned by abrasive blast cleaning to near-white metal. The number and frequency of tests for coating thickness, continuity, flexibility and adhesion are specified. If the specimen for coating thickness or flexibility fails to meet the specified requirements, two retests on random samples shall be conducted for each failed test.
SCOPE
1.1 This specification covers deformed and plain steel reinforcing bars with protective epoxy coating applied by the electrostatic spray method.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 Requirements for coatings are contained in Annex A1.
1.4 Requirements for patching material are contained in Annex A2.
1.5 Guidelines for construction practices at the job-site are presented in Appendix X1.
1.6 This specification is applicable for orders in either SI units (as Specification A775M) or inch-pound units [as Specification A775].
1.7 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.8 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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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:A775/A775M −07b(Reapproved 2014)
Standard Specification for
Epoxy-Coated Steel Reinforcing Bars
This standard is issued under the fixed designationA775/A775M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Referenced Documents
1.1 This specification covers deformed and plain steel 2.1 ASTM Standards:
reinforcing bars with protective epoxy coating applied by the A615/A615MSpecificationforDeformedandPlainCarbon-
electrostatic spray method. Steel Bars for Concrete Reinforcement
A706/A706MSpecification for Deformed and Plain Low-
NOTE 1—The coating applicator is identified throughout this specifica-
Alloy Steel Bars for Concrete Reinforcement
tion as the manufacturer.
A944Test Method for Comparing Bond Strength of Steel
1.2 Other organic coatings may be used provided they meet
Reinforcing Bars to Concrete Using Beam-End Speci-
the requirements of this specification.
mens
1.3 Requirements for coatings are contained in Annex A1.
A996/A996MSpecification for Rail-Steel and Axle-Steel
Deformed Bars for Concrete Reinforcement
1.4 Requirements for patching material are contained in
B117Practice for Operating Salt Spray (Fog) Apparatus
Annex A2.
D374Test Methods for Thickness of Solid Electrical Insu-
1.5 Guidelines for construction practices at the job-site are
lation (Withdrawn 2013)
presented in Appendix X1.
D2967Test Method for Corner Coverage of Powder Coat-
1.6 This specification is applicable for orders in either SI
ings
units (as Specification A775M) or inch-pound units [as Speci-
D4060Test Method for Abrasion Resistance of Organic
fication A775].
Coatings by the Taber Abraser
G8Test Methods for Cathodic Disbonding of Pipeline Coat-
1.7 The values stated in either SI units or inch-pound units
ings
are to be regarded separately as standard. The values stated in
G14TestMethodforImpactResistanceofPipelineCoatings
each system may not be exact equivalents; therefore, each
(Falling Weight Test)
system shall be used independently of the other. Combining
G20Test Method for Chemical Resistance of Pipeline Coat-
values from the two systems may result in non-conformance
ings
with the standard.
G62Test Methods for Holiday Detection in Pipeline Coat-
1.8 This standard does not purport to address all of the
ings
safety concerns, if any, associated with its use. It is the
2.2 NACE Standards:
responsibility of the user of this standard to establish appro-
RP-287-87Field Measurement of Surface Profile of Abra-
priate safety and health practices and determine the applica-
sive Blast-Cleaned Steel Surface Using a Replica Tape
bility of regulatory limitations prior to use.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
This specification is under the jurisdiction ofASTM Committee A01 on Steel, Standards volume information, refer to the standard’s Document Summary page on
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee the ASTM website.
A01.05 on Steel Reinforcement. The last approved version of this historical standard is referenced on
Current edition approved March 1, 2014. Published March 2014. Originally www.astm.org.
approved in 1981. Last previous edition approved in 2007 as A775/A775M – 07b. Available from NACE International (NACE), 1440 South Creek Dr., Houston,
DOI: 10.1520/A0775_A0775M-07BR14. TX 77084-4906, http://www.nace.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A775/A775M−07b (2014)
2.3 SSPC Specifications: 4.1.9 Additional specimens to be provided to the purchaser
SSPC-PA2Measurement of Dry Coating Thickness with for testing from the coated steel reinforcing bars being fur-
Magnetic Gages nished (12.1), and
SSPC-SP10Near-White Blast Cleaning 4.1.10 Manufacturer qualification and certification require-
SSPC-VIS1Pictorial Surface Preparation Standards for ments (if any).
Painting Steel Surfaces
NOTE2—Itisrecommendedthatthecoatingapplicationproceduresand
2.4 CRSI Documents:
processes be audited by an independent certification program for epoxy
coating applicator plants such as that provided by the Concrete Reinforc-
“Voluntary Certification Program for Fusion Bonded Epoxy
ing Steel Institute, or equivalent.
Coating Applicator Plants”
NOTE 3—Atypical ordering description is as follows: Deformed Grade
2.5 ACI Standards:
420 bars toASTM A615M_____; 6000 m, No. 19, 12 m long in secured
ACI301Specifications for Structural Concrete
lifts with sufficient spacers or padding, or both; epoxy-coated to ASTM
A775M–_____; including written certifications for the powder coating
and coated bars, and 1 L of patching material.
3. Terminology
[Deformed Grade 60 bars to ASTM A615M–_____; 20000 ft, No. 6,
3.1 Definitions of Terms Specific to This Standard:
40 ft 0 in. long in secured lifts with sufficient spacers or padding, or both;
3.1.1 conversion coating, n—preparation of the blast- epoxy-coated to ASTM A775–_____; including written certifications for
the powder coating and coated bars, and 1 qt of patching material.]
cleaned steel surface prior to coating application that is
designed to pretreat the metal to promote coating adhesion,
5. Materials
reduce metal-coating reactions, improve corrosion resistance,
5.1 Steel reinforcing bars to be coated shall meet the
and increase blister resistance.
requirements of one of the following specifications: A615M,
3.1.2 disbonding, n—loss of adhesion between the fusion-
A706M,orA996M[A615,A706,orA996],asspecifiedbythe
bonded epoxy coating and the steel reinforcing bar.
purchaserandshallbefreeofcontaminantssuchasoil,grease,
3.1.3 fusion-bonded epoxy coating, n—product containing
or paint.
pigments, thermosetting epoxy resins, crosslinking agents, and
NOTE4—Priortocoating,thesteelreinforcingbarsshouldbeinspected
other additives, which is applied in the form of a powder onto
fortheirsuitabilityforcoating.Barswithsharpedgesonthedeformations,
a clean, heated metallic substrate and fuses to form a continu-
rolled-in slivers, or other surface imperfections are difficult to coat
ous barrier coating. properly and should not be coated. The coating will flow away from the
sharpedgesandmayresultininadequatecoatingthicknessatthesepoints.
3.1.4 holiday, n—discontinuity in a coating that is not
5.2 The powder coating shall meet the requirements of
discernible to a person with normal or corrected vision.
AnnexA1. Upon request, the purchaser shall be provided with
3.1.5 patching material, n—liquid two-part epoxy coating
the test report for review.
used to repair damaged or uncoated areas.
5.2.1 A written certification shall be furnished to the pur-
3.1.6 wetting agent, n—material that lowers the surface
chaserthatproperlyidentifiesthenumberofeachlotofpowder
tension of water allowing it to penetrate more effectively into
coatingusedintheorder,materialquantityrepresented,dateof
small discontinuities in the coating giving a more accurate
manufacture, name and address of the powder coating
indication of the holiday count.
manufacturer,andastatementthatthesuppliedpowdercoating
is the same composition as that qualified according to Annex
4. Ordering Information
A1 of this specification.
4.1 It shall be the responsibility of the purchaser to specify
5.2.2 The powder coating shall be stored in a temperature-
all requirements that are necessary for the coated steel rein-
controlled environment following the written recommenda-
forcing bars under this specification. Such requirements to be
tions of the powder coating manufacturer until ready for use.
considered include, but are not limited to, the following:
At that point, if the storage temperature is below the plant
4.1.1 Reinforcing bar specification and year of issue,
ambient temperature, the powder coating shall be given suffi-
4.1.2 Quantity of bars,
cient time to reach approximate plant ambient temperature.
4.1.3 Size and grade of bars,
The powder coating shall be used within the powder coating
4.1.4 Requirements for the powder coating and provision of
manufacturer’s written recommended shelf life.
test data (5.2 and 5.3),
5.3 If specified in the order, a representative 0.2-kg [8-oz]
4.1.5 Requirements for patching material (5.4.2),
sampleofthepowdercoatingshallbesuppliedtothepurchaser
4.1.6 Quantity of patching material,
from each batch. The sample shall be packaged in an airtight
4.1.7 Specific requirements for test frequency (9.1),
container and identified by batch number.
4.1.8 Whether a report on tests performed on the coated
5.4 Patchingmaterialforrepairingdamagedcoatingshallbe
steelreinforcingbarsbeingfurnishedisrequired(8.4.1and14)
compatible with the coating, inert in concrete, and feasible for
repairs at the applicator plant or at the fabricating shop.
Patching material shall be approved in accordance with Annex
Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,
Pittsburgh, PA 15222-4656, http://www.sspc.org.
A2 prior to use.
Available from Concrete Reinforcing Steel Institute (CRSI), 933 North Plum
5.4.1 The patching material manufacturer shall specify the
Grove Rd., Schaumburg, IL 60173–4758, http://www.crsi.org.
metals surface preparation, and the procedures for application
AvailablefromAmericanConcreteInstitute(ACI),P.O.Box9094,Farmington
Hills, MI 48333-9094, http://www.concrete.org. of the patching material.
A775/A775M−07b (2014)
5.4.2 If specified in the order, patching material conforming 8. Requirements for Coated Steel Reinforcing Bars
to Annex A2 and recommended by the powder coating
8.1 Coating Thickness:
manufacturer shall be supplied to the purchaser.
8.1.1 Thecoatingthicknessmeasurementsaftercuringshall
be 175 to 300 µm [7 to 12 mils] for bars sizes Nos. 10 to 16
6. Surface Preparation
[Nos. 3 to 5] and 175 to 400 µm [7 to 16 mils] for bar sizes
6.1 The surface of the steel reinforcing bars to be coated
Nos.19to57[Nos.6to18].Theupperthicknesslimitshallnot
shall be cleaned by abrasive blast cleaning to near-white metal apply to repaired areas of damaged coating.
in accordance with SSPC-SP10.Additional surface treatment,
8.1.2 A single recorded steel reinforcing bar coating thick-
asindicatedin6.3,ispermitted.UseofSSPC-VIS1asavisual ness measurement is the average of three individual gage
standard of comparison to define the final surface condition is
readings obtained between four consecutive deformations. A
permitted. Average blast profile maximum roughness depth minimum of five recorded measurements shall be taken ap-
readingsof0.04to0.10mm[1.5to4.0mils],asdeterminedby
proximately evenly spaced along each side of the test speci-
replica tape measurements using NACE RP-287-87, shall be mens (a minimum of ten recorded measurements per bar).
considered suitable as an anchor pattern.
8.1.3 For acceptance purposes, the average of all recorded
coating thickness measurements shall not be less than the
NOTE 5—The use of a “profilometer” type surface measurement
specified minimum thickness or more than the specified
instrument that measures the peak count as well as the maximum profile
maximum thickness. No single recorded coating thickness
depth is recommended.
NOTE 6—Abrasive blast cleaning of steel reinforcing bars with a high
measurementshallbelessthan80%ofthespecifiedminimum
degree (>90%) of grit in the cleaning media provides the most suitable
thickness or more than 120 % of the specified maximum
anchor profile for coating adhesion. After grit has been recycled, a small
thickness.
portion will take on the appearance of shot.
8.1.4 Measurements shall be made in accordance with
6.2 Multidirectional, high-pressure dry air knives shall be
SSPC-PA2, following the instructions for calibration and use
used after blasting to remove dust, grit, and other foreign
recommended by the thickness gage manufacturer. Pull-off or
matterfromtheblast-cleanedsteelsurface.Theairknivesshall
fixed probe gages shall be used. “Pencil-type” pull-off gages
not deposit oil on the steel reinforcing bars.
that require the operator to observe the reading at the instant
the magnet is pulled from the surface shall not be used.
NOTE 7—It is recommended that incoming steel reinforcing bars and
blast media be checked for salt contamination prior to use. Blast media
8.1.5 The coating thickness shall be measured on the body
found to be salt contaminated should be rejected. Steel reinforcing bars
of a straight length of steel reinforcing bar between the
found to be salt contaminated from exposure to deicing salts or salt spray
deformations.
should be cleaned by acid washing or other suitable methods to remove
salt contaminants from the surface prior to blast cleaning.
8.2 Coating Continuity:
8.2.1 The manufacturer’s plant shall have an operational
6.3 It shall be permissible for the manufacturer to use a
in-line 67.5 V, 80 000 Ω, wet-sponge type direct-current
chemical wash or conversion of the blast-cleaned steel rein-
holiday detector or equivalent method with an automated
forcing bar surface, or both, to enhance coating adhesion.This
holiday counting system to determine the acceptability of the
pretreatmentshallbeappliedafterabrasivecleaningandbefore
steel reinforcing bars prior to shipment.
coating,inaccordancewiththewrittenapplicationinstructions
specified by the pretreatment manufacturer.
NOTE 9—Handheld holiday detector checks should be performed each
production day to verify the accuracy of the in-line system. Handheld
holiday detectors offer a reliable way to correlate data obtained from the
7. Coating Application
in-line holiday-detection system.
7.1 If pretreatment is used in the preparation of the surface,
8.2.2 On average, there shall not be more than 3 holidays
the powder coating shall be applied to the cleaned and
per metre [one holiday per foot] on a coated steel reinforcing
pretreatedsteelreinforcingbarsurfaceassoonaspossibleafter
bar. The average applies to the full production length of a bar.
surface treatments have been completed, and before visible
8.2.3 Awetting agent shall be used in accordance with Test
oxidation of the surface occurs as discernible to a person with
Methods G62 in the inspection for holidays on the coated steel
normal or corrected vision. In no case shall application of the
reinforcing bars.
coating be delayed more than 3 h after cleaning.
8.3 Coating Flexibility:
7.2 The fusion-bonded epoxy pow
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