ASTM A934/A934M-00a

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: A 934/A 934M – 00a
Standard Specification for
Epoxy-Coated Prefabricated Steel Reinforcing Bars
This standard is issued under the fixed designation A 934/A 934M; 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.
1. Scope A 615/A 615M Specification for Deformed and Plain
Billet-Steel Bars for Concrete Reinforcement
1.1 This specification covers deformed and plain steel
A 706/A 706M Specification for Low-Alloy Steel De-
reinforcing bars which prior to surface preparation are prefab-
formed and Plain Bars for Concrete Reinforcement
ricated and then coated with a protective fusion-bonded epoxy
A 775/A 775M Specification for Epoxy-Coated Reinforc-
coating by electrostatic spray or other suitable method.
ing Steel Bars
1.2 Prefabricated steel reinforcing bars coated with fusion-
A 944 Test Method for Comparing Bond Strength of Steel
bonded epoxy formulations in accordance with this specifica-
Reinforcing Bars to Concrete Using Beam-End Speci-
tion are not intended to be bent or rebent.
mens
NOTE 1—Experience has shown epoxy-coated prefabricated steel rein-
A 996/A 996M Specification for Rail-Steel and Axle-Steel
forcing bars have limited capability to be successfully field bent or rebent
Deformed Bars for Concrete Reinforcement
(see 9.3.1). If the construction project requires epoxy-coated steel rein-
B 117 Practice for Operating Salt Spray (Fog) Testing
forcing bars that must be able to sustain field bending or rebending, the
Apparatus
use of coated bars conforming to Specification A 775/A 775M should be
D 4060 Test Method for Abrasion Resistance of Organic
considered.
Coatings by the Taber Abraser
1.3 Organic coatings other than epoxy may be used pro-
G 8 Test Methods for Cathodic Disbonding of Pipeline
vided they meet the requirements of this specification.
Coatings
1.4 Requirements for epoxy coatings are contained in An-
G 12 Test Method for Nondestructive Measurement of Film
nex A1.
Thickness of Pipeline Coatings on Steel
1.5 Guidelines for application process and product test
G 14 Test Method for Impact Resistance of Pipeline Coat-
procedures of epoxy coatings for steel reinforcing bars are
ings (Falling Weight Test)
presented in Appendix X1.
G 20 Test Method for Chemical Resistance of Pipeline
1.6 Guidelines for construction practices at the job-site for
Coatings
coated steel reinforcing bars are presented in Appendix X2.
G 42 Test Method for Cathodic Disbonding of Pipeline
1.7 This specification is applicable for orders in either SI
Coatings Subjected to Elevated Temperatures
(metric) units (as Specification A 934M) or inch-pound units
G 62 Test Methods for Holiday Detection in Pipeline Coat-
[as Specification A 934].
ings
1.8 The values stated in either SI or inch-pound units are to
2.2 NACE International Standard:
be regarded as standard. Within the text, the inch-pound units
RP 0287 Field Measurement of Surface Profile of Abrasive
are shown in brackets. The values stated in the two systems are
Blast Cleaned Steel Surfaces Using a Replica Tape
not exact equivalents: therefore, each system must be used
2.3 Society for Protective Coatings Specifications:
independently of the other. Combining values from the systems
SSPC-SP 10 Near-White Blast Cleaning
may result in nonconformance with this specification.
SSPC-VIS 1 Pictorial Surface Preparation Standards for
1.9 This standard does not purport to address all of the
Painting Steel Surfaces
safety concerns, if any, associated with its use. It is the
2.4 American Concrete Institute Specification:
responsibility of the user of this standard to establish appro-
ACI 301 Specifications for Structural Concrete
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
Annual Book of ASTM Standards, Vol 01.04.
2.1 ASTM Standards:
Annual Book of ASTM Standards, Vol 03.02.
Annual Book of ASTM Standards, Vol 06.01.
Annual Book of ASTM Standards, Vol 06.02.
1 6
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Available from NACE International, 1440 South Creek, Houston, TX 77084.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee Available from Society for Protective Coatings, 40 24th Street, Pittsburgh, PA
A01.05 on Steel Reinforcement. 15222.
Current edition approved Oct. 10, 2000. Published December 2000. Originally Available from American Concrete Institute, 38800 International Way, P.O. Box
published as A 934/A 934M – 95. Last previous edition A 934/A 934M – 00. 9094, Farmington Hills, MI 48333–9094.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
A 934/A 934M
ASTM A 934 – ____; including written certifications for the powder
2.5 Concrete Reinforcing Steel Institute:
coating and coated bars and 1 qt. of patching material.
“Voluntary Certification Program for Fusion-Bonded Ep-
oxy Coating Applicator Plants”
5. Materials
5.1 Steel reinforcing bars to be coated shall meet the
3. Terminology
requirements of one of the following specifications: A 615M,
3.1 Definitions of Terms Specific to This Standard:
A 706M, or A 996M [A 615, A 706, or A 996] as specified by
3.1.1 conversion coating—a preparation of the blast-
the purchaser and shall be free of contaminants such as oil,
cleaned metal surface prior to coating application that is
grease, or paint.
designed to pretreat the metal to promote coating adhesion,
reduce metal coating reactions, improve corrosion resistance, NOTE 3—Prior to coating, the steel reinforcing bars should be inspected
for their suitability for coating. Bars with sharp edges on the deformations,
and increase blister resistance.
rolled-in slivers, or other surface imperfections are difficult to coat
3.1.2 disbonding—loss of adhesion between the fusion-
properly. The coating will flow away from the sharp edges and may result
bonded epoxy coating and the steel reinforcing bar.
in inadequate coating thickness at these points.
3.1.3 fusion-bonded epoxy coating—a product containing
5.2 The powder coating shall meet the requirements of
pigments, thermosetting epoxy resins, crosslinking agents, and
Annex A1. Upon request, the purchaser shall be provided with
other additives, which is applied in the form of a powder onto
test data for review.
a clean, heated metallic substrate and fuses to form a continu-
5.2.1 A written certification shall be furnished to the pur-
ous barrier coating.
chaser that properly identifies the lot designation of the powder
3.1.4 holiday—a discontinuity in a coating that is not
coating used in the order, material quantity represented, date of
discernible to a person with normal or corrected vision.
manufacture, name and address of the powder coating manu-
3.1.5 patching material—a liquid two-part epoxy coating,
facturer, and a statement that the supplied powder coating is the
formulated to be compatible with the fusion-bonded epoxy
same composition as that qualified according to Annex A1 of
powder coating, used to repair damaged areas and cut ends.
this specification. The powder coating shall be used within the
3.1.6 prefabricated bars—steel reinforcing bars that are cut
powder coating manufacturer’s written recommended shelf
to specified lengths and bent to the required shapes prior to
life.
coating.
5.2.2 If specified in the order, a representative 0.2-kg [8-oz]
3.1.7 wetting agent—a material that lowers the surface
sample of the powder coating shall be supplied to the purchaser
tension of water allowing it to penetrate more effectively into
from each batch. The sample shall be packaged in an airtight
small discontinuities in the coating, giving a more accurate
container and identified by the batch designation.
indication of the holiday count.
5.2.3 The powder coating shall be maintained in a
temperature-controlled environment following the written rec-
4. Ordering Information
ommendations of the powder coating manufacturer until ready
4.1 It shall be the responsibility of the purchaser to specify
for use, at which point the powder coating shall be given
all requirements that are necessary for the coated steel rein-
sufficient time to reach approximate plant ambient temperature.
forcing bars under this specification. Such requirements to be
5.3 If specified in the order, patching material, compatible
considered include, but are not limited to, the following:
with the coating, inert in concrete, and recommended by the
4.1.1 Reinforcing bar specification and year of issue,
powder coating manufacturer, shall be supplied to the pur-
4.1.2 Quantity and bend types of bars,
chaser.
4.1.3 Size and grade of bars,
4.1.4 Requirements for the powder coating and provision of
6. Prefabrication of Steel Reinforcing Bars
test data (5.2),
6.1 The steel reinforcing bars to be coated shall have been
4.1.5 Requirements for patching material (5.3),
prefabricated in accordance with the purchaser’s requirements
4.1.6 Quantity of patching material,
or project specifications prior to surface preparation.
4.1.7 Whether a report on tests performed on the coated
steel reinforcing bars being furnished is required (15.1),
NOTE 4—Drive rolls on shear beds and backup barrels on benders
4.1.8 Method for temperature reduction of hot, freshly should be protected with a suitable covering to minimize crushing or
creating rollover damage to the steel reinforcing bar deformations during
coated bars (unforced air cool down or forced air/water
the fabrication process.
quench) (8.3).
7. Surface Preparation of Steel Reinforcing Bars
NOTE 2—A typical ordering description is as follows: Deformed Grade
420 bars to ASTM A 615M – ____; 6000 m, No. 19; cut to specified
7.1 The surface of the steel reinforcing bars shall be cleaned
lengths and fabricated prior to coating; epoxy-coated to ASTM A
by abrasive blast steel grit to near-white metal in accordance
934M – ____; including written certifications for the powder coating and
with SSPC-SP10.
coated bars and 1 L of patching material.
7.1.1 The final surface condition shall be defined according
[Deformed Grade 60 bars to ASTM A 615 – ______; 20 000 ft, No. 6;
to SSPC-VIS1.
cut to specified lengths and fabricated prior to coating; epoxy-coated to
7.1.2 Average blast profile roughness depth readings of 37
to 100 μm [1.5 to 4.0 mils], as determined by replica tape
measurements using RP0287 or other methods acceptable to
Available from Concrete Reinforcing Steel Institute, 933 N. Plum Grove Rd.,
Schaumburg, IL 60173. the purchaser, shall be considered suitable as an anchor pattern.
A 934/A 934M
NOTE 5—The use of a profilometer type surface measurement instru-
ness measurement is the average of three individual readings
ment that measures the peak count as well as the maximum profile depth
obtained between three consecutive deformations. A minimum
is recommended.
of five recorded measurements shall be obtained approximately
7.2 A steel grit of Rockwell Hardness C50 or higher shall be
evenly spaced along each side of the test bar (a minimum of ten
used. A maximum of 5 % steel shot is allowable in the media. recorded measurements per bar).
9.1.4 Measurements shall be made in accordance with Test
NOTE 6—Recycled steel grit abrasive should be maintained so as to
Method G 12 following the instructions for calibration and use
minimize contaminants such as oil, salt, and dust caused by the blasting
recommended by the thickness gage manufacturer. Pull-off or
operation.
fixed probe gages shall be used. Pencil-type pull-off gages that
7.3 Multidirectional, high-pressure dry air knives shall be
require the operator to observe the readings at the instant the
used after blast cleaning to remove dust, grit, and other foreign
magnet is pulled from the surface shall not be used.
matter from the steel surface. The air knives shall not deposit
9.1.5 The coating thickness shall be measured on the body
oil on the steel reinforcing bars.
of a straight length of coated steel reinforcing bar between the
NOTE 7—It is recommended that incoming steel reinforcing bars and
deformations or ribs.
blast media be checked for salt contamination prior to use. Blast media
9.2 Coating Continuity:
found to be salt contaminated should be rejected. Steel reinforcing bars
9.2.1 Holiday checks to determine the acceptability of the
found to be salt contaminated from exposure to deicing salts or salt spray
coated steel reinforcing bars prior to shipment shall be made at
should be cleaned by acid washing or other suitable methods to remove
the manufacturer’s plant with a hand-held 67.5-V, 80 000-V,
salt contiminants from the surface prior to blast cleaning.
wet-sponge-type dc holiday detector.
7.4 It shall be permissible for the manufacturer to use a
9.2.2 There shall not be on average more than three holidays
chemical wash or conversion of the steel reinforcing bar
per metre [one holiday per linear foot] on the coated steel
surface, or both, to enhance coating adhesion. This pretreat-
reinforcing bars. For coated bars less than 0.3 m [1 ft] in
ment shall be applied after abrasive cleaning and before
length, the maximum shall be one holiday.
coating, in accordance with the written application instructions
9.2.3 A wetting agent shall be used in accordance with Test
specified by the pretreatment manufacturer.
Methods G 62 in the inspection for holidays on the coated steel
8. Coating Application reinforcing bars.
9.2.4 The coated steel reinforcing bars shall be inspected at
8.1 Cleaned, uncoated steel reinforcing bars shall be
a maximum rate of 0.05 m/s [0.2 ft/s], wiping one side of the
handled by personnel wearing clean gloves to prevent contami-
coated bar and then the other with the wetted sponge or an
nation of the steel surface.
equivalent method.
8.2 If pretreatment is used in the preparation of the surface
the powder coating shall be applied to the cleaned and
NOTE 9—Care should be taken that contact of the sponge along the
pretreated steel reinforcing bar surface as soon as possible after entire steel surface being tested is maintained in order to obtain an
accurate holiday count.
surface treatments have been completed, and before visible
oxidation of the surface occurs as discernible to a person with
9.3 Coating Flexibility:
normal or corrected vision. In no case shall application of the
9.3.1 Coating flexibility shall be evaluated by bending
coating be delayed more than 3 h after cleaning.
production-coated steel reinforcing bars around a mandrel
8.3 The fu
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