ASTM A882/A882M-20

Standard Specification for Filled Epoxy-Coated Seven-Wire Steel Prestressing Strand

ABSTRACT
This specification covers filled epoxy-coated seven-wire prestressing steel strands with protective fusion-bonded epoxy coating applied by the electrostatic deposition method. This specification also covers relaxation loss limits for filled epoxy coated strands. Prestressing steel strands shall be free of contaminants such as oil, grease, or paint. Steel strand surfaces shall be cleaned to meet coating requirements, such as coating thickness, coating continuity, coating adhesion, coating composition, and coating bond with concrete or grout. Smooth or grit-impregnated coating shall be applied by the electrostatic deposition method or other method that will meet the coating requirements. Pullout tests shall be performed three times annually or maybe repeated if the coating failed to meet the requirements.
SCOPE
1.1 This specification covers seven-wire steel prestressing strand with protective fusion-bonded epoxy powder coating applied by the electrostatic deposition method or other suitable method, with the interstices of the seven wires filled with epoxy to minimize migration of corrosive media, either by capillary action or other hydrostatic forces.  
Note 1: The manufacturer as identified throughout this specification is the coating applicator.  
1.2 A supplementary requirement (S1) is provided for use where bond strength testing of 0.600-in. [15.24-mm] diameter grade 270 [1860] epoxy-coated strand for applications in prestressed ground anchors is required by the purchaser. The supplementary requirement applies only when specified in the purchase order or contract.  
1.3 Requirements for epoxy powder coatings are contained in Annex A1.  
1.4 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification.  
1.5 This specification is applicable for orders in either inch-pound units (as Specification A882) or SI units [as Specification A882M].  
1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. 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 specification.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 29-Feb-2020
• ICS: 25.220.60 - Organic coatings
• ICS: 77.140.65 - Steel wire, wire ropes and link chains
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.05 - Steel Reinforcement

Relations

• Refers: ASTM A416/A416M-24 - Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-Mar-2024
• Refers: ASTM A981/A981M-23 - Standard Test Method for Evaluating Bond Strength for 0.600-in. [15.24-mm] Diameter Seven-Wire Steel Strand, Grade 270 [1860], Used in Prestressed Ground Anchors
• Effective Date: 01-Sep-2023
• Refers: ASTM A1061/A1061M-20 - Standard Test Methods for Testing Multi-Wire Steel Prestressing Strand
• Effective Date: 01-May-2020
• Refers: ASTM G20-10(2019) - Standard Test Method for Chemical Resistance of Pipeline Coatings
• Effective Date: 01-Oct-2019
• Refers: ASTM A416/A416M-17a - Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-Dec-2017
• Refers: ASTM A416/A416M-17 - Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-May-2017
• Refers: ASTM A416/A416M-16 - Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-Mar-2016
• Refers: ASTM A416/A416M-15 - Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-May-2015
• Refers: ASTM A416/A416M-12a - Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete
• Effective Date: 01-Sep-2012
• Refers: ASTM D7091-12 - Standard Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
• Effective Date: 01-Apr-2012
• Refers: ASTM A416/A416M-12 - Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete
• Effective Date: 01-Apr-2012
• Refers: ASTM B117-11 - Standard Practice for Operating Salt Spray (Fog) Apparatus
• Effective Date: 01-Oct-2011
• Refers: ASTM A981/A981M-11 - Standard Test Method for Evaluating Bond Strength for 0.600-in. [15.24-mm] Diameter Steel Prestressing Strand, Grade 270 [1860], Uncoated, Used in Prestressed Ground Anchors
• Effective Date: 01-Apr-2011
• Refers: ASTM D968-05(2010) - Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive
• Effective Date: 01-Dec-2010
• Refers: ASTM G14-04(2010) - Standard Test Method for Impact Resistance of Pipeline Coatings (Falling Weight Test)
• Effective Date: 01-Dec-2010

Overview

ASTM A882/A882M-20 is the internationally recognized standard specification for filled epoxy-coated seven-wire steel prestressing strands. Developed by ASTM International, this standard defines the performance and quality requirements for steel strands coated with a protective, fusion-bonded epoxy applied using the electrostatic deposition method. The standard serves the construction industry by specifying how the epoxy is applied and how the filled interstices help inhibit the migration of corrosive media, thereby greatly improving corrosion resistance in prestressed concrete applications. It also establishes requirements for coating thickness, continuity, adhesion, bond with concrete or grout, and relaxation losses.

Key Topics

• Epoxy-Coated Seven-Wire Strand: The specification details the properties and application methods for seven-wire steel strands, emphasizing the fusion-bonded epoxy coating process and requirements for filled interstices.
• Corrosion Protection: The filled epoxy coating minimizes the capillary migration of corrosive agents such as water and salts, which significantly prolongs the service life of prestressed steel in concrete structures.
• Coating Requirements:
  • Coating thickness must be between 15 and 45 mils (380 to 1140 μm).
  • Coating continuity is ensured with in-line holiday detection.
  • Adhesion to substrate is verified through bend and tension testing.
  • Bond to concrete or grout is demonstrated via pull-out tests, especially for grit-impregnated coatings.
• Material Quality: The steel strands must be free from contaminants, including oil, grease, or paint, and must undergo thorough surface preparation prior to epoxy application.
• Testing and Inspection:
  • Pullout tests are performed at least annually to confirm bond properties.
  • Additional tests for coating thickness, continuity, chemical resistance, abrasion, and impact qualities.
  • Certificates and representative samples of epoxy coating batches may be required as part of procurement.

Applications

Filled epoxy-coated seven-wire steel prestressing strands, as specified in ASTM A882/A882M-20, are primarily used in:

• Prestressed Concrete Structures: Including bridges, parking structures, buildings, and transportation infrastructure where durability and corrosion resistance are essential.
• Prestressed Ground Anchors: An optional supplementary requirement covers bond testing for use in ground anchors, ensuring reliable performance under load.
• Harsh Environmental Conditions: Ideal for use in marine, coastal, and locations exposed to deicing chemicals or salt spray, where minimizing corrosion is critical to structural integrity.

Using this standard helps ensure:

• Enhanced durability and longevity of concrete structures by controlling corrosion in prestressing tendons.
• Compliance with industry best practices for coating application, curing, inspection, and field repairs.
• Reliable performance for both public and private sector construction projects.

Related Standards

ASTM A882/A882M-20 references and aligns with several other important industry standards:

• ASTM A416/A416M: Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete.
• ASTM A1061/A1061M: Test Methods for Testing Multi-Wire Steel Prestressing Strand.
• ASTM A981/A981M: Test Method for Evaluating Bond Strength for 0.600-in. Diameter Steel Prestressing Strand.
• SSPC-PA2: Procedure for Determining Conformance to Dry Coating Thickness Requirements.
• ASTM D968: Test Methods for Abrasion Resistance of Organic Coatings.
• ASTM B117: Practice for Operating Salt Spray (Fog) Apparatus.
• ASTM D7091: Practice for Nondestructive Measurement of Dry Film Thickness.

These related documents support the comprehensive testing, certification, and performance validation required by ASTM A882/A882M-20, ensuring quality and reliability in filled epoxy-coated prestressing strand applications.

Keywords: ASTM A882, epoxy-coated strand, seven-wire steel, prestressed concrete, corrosion protection, fusion-bonded epoxy, prestressing steel strand, coated steel strand, construction standards, infrastructure durability.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A882/A882M −20
Standard Specification for
Filled Epoxy-Coated Seven-Wire Steel Prestressing Strand
This standard is issued under the fixed designationA882/A882M; 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.
1. Scope Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.1 This specification covers seven-wire steel prestressing
Barriers to Trade (TBT) Committee.
strand with protective fusion-bonded epoxy powder coating
appliedbytheelectrostaticdepositionmethodorothersuitable
2. Referenced Documents
method, with the interstices of the seven wires filled with
epoxy to minimize migration of corrosive media, either by 2.1 ASTM Standards:
A416/A416M Specification for Low-Relaxation, Seven-
capillary action or other hydrostatic forces.
Wire Steel Strand for Prestressed Concrete
NOTE1—Themanufacturerasidentifiedthroughoutthisspecificationis
A981/A981MTestMethodforEvaluatingBondStrengthfor
the coating applicator.
0.600-in. [15.24-mm] Diameter Steel Prestressing Strand,
1.2 A supplementary requirement (S1) is provided for use
Grade 270 [1860], Uncoated, Used in Prestressed Ground
where bond strength testing of 0.600-in. [15.24-mm] diameter
Anchors
grade 270 [1860] epoxy-coated strand for applications in
A1061/A1061MTest Methods for Testing Multi-Wire Steel
prestressed ground anchors is required by the purchaser. The
Prestressing Strand
supplementary requirement applies only when specified in the
B117Practice for Operating Salt Spray (Fog) Apparatus
purchase order or contract.
D968Test Methods for Abrasion Resistance of Organic
1.3 Requirements for epoxy powder coatings are contained
Coatings by Falling Abrasive
in Annex A1.
D7091Practice for Nondestructive Measurement of Dry
Film Thickness of Nonmagnetic Coatings Applied to
1.4 The text of this specification references notes and
Ferrous Metals and Nonmagnetic, Nonconductive Coat-
footnotes which provide explanatory material.These notes and
ings Applied to Non-Ferrous Metals
footnotes (excluding those in tables) shall not be considered as
G14TestMethodforImpactResistanceofPipelineCoatings
requirements of the specification.
(Falling Weight Test)
1.5 This specification is applicable for orders in either
G20Test Method for Chemical Resistance of Pipeline Coat-
inch-pound units (as Specification A882) or SI units [as
ings
Specification A882M].
2.2 Federal Highway Administration Report:
1.6 The values stated in either SI units or inch-pound units
FHWA-RD-74-18Nonmetallic Coatings for Concrete Rein-
are to be regarded separately as standard. Within the text, the
forcing Bars (February 1974)
SI units are shown in brackets. The values stated in each
2.3 SSPC Specification:
system may not be exact equivalents; therefore, each system
SSPC-PA2Procedure for Determining Conformance to Dry
shall be used independently of the other. Combining values
Coating Thickness Requirements
from the two systems may result in non-conformance with the
2.4 U.S. Military Standard:
specification.
MIL-STD-129Marking for Shipment and Storage
1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
This specification is under the jurisdiction ofASTM Committee A01 on Steel, the ASTM website.
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee Available from National Technical Information Service (NTIS), 5285 Port
A01.05 on Steel Reinforcement. Royal Rd., Springfield, VA 22161, http://www.ntis.gov.
Current edition approved March 1, 2020. Published April 2020. Originally Available from Society for Protective Coatings (SSPC), 800 Trumbull Dr.,
approved in 1991. Last previous edition approved in 2004 as A882/A882M–04a Pittsburgh, PA 15205, http://www.sspc.org.
which was withdrawn January 2019 and reinstated in March 2020. DOI: 10.1520/ Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
A0882_A0882M-20. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A882/A882M−20
2.5 U.S. Federal Standard: be specified by the purchaser and shall be free of contaminants
Fed. Std. No. 123 Marking for Shipment (Civil Agencies) such as oil, grease, or paint.
5.1.1 Filled epoxy-coated strand shall not exhibit relaxation
3. Terminology
losses of more than 6.5 % after 1000 hours, when initially
loaded to 70 % of the specified minimum breaking strength of
3.1 Definitions of Terms Specific to This Standard:
the strand and tested under the conditions of Test Methods
3.1.1 batch, n—epoxy powder or patching material con-
A1061/A1061M.
tained in an individual shipping release or shipping order.
5.2 The epoxy powder coating shall meet the requirements
3.1.2 disbonding, n—loss of adhesion between the fusion-
listed in Annex A1. The epoxy powder coating shall be of
bonded epoxy coating and the steel strand wires.
organic composition except for the pigment, or grit if
3.1.3 fusion-bonded epoxy coating, n—a product containing
applicable, which may be inorganic if used.
pigments, thermo-setting epoxy resins, cross-linking agents,
5.2.1 A written certification shall be furnished to the pur-
and other substances, which is applied in the form of powder
chaser that properly identifies the number of each batch of
onto a clean, heated metallic substrate and fuses to form a
epoxy powder coating used in the purchase order, material
continuous barrier coating.
quantityrepresented,dateofmanufacture,nameandaddressof
3.1.4 grit, n—inert particles impregnated on the outer sur-
epoxy powder coating manufacturer, and a statement that the
face of the epoxy coating for improving bond with cement
suppliedepoxypowdercoatingisthesamecompositionasthat
grout.
qualified in accordance with Annex A1.
3.1.5 holiday, n—a flaw, void, crack, thin spot, foreign
5.3 If specified in the purchase order or contract, a repre-
inclusion, or contamination in the coating film that
sentative 8-oz [0.2-kg] sample of the epoxy powder coating
significantly lowers the dielectric strength of the coating film.
shallbesuppliedtothepurchaserfromeachbatch.Thesample
A holiday may also be identified as a pinhole.
shall be packaged in an airtight container and identified by
3.1.6 lot,n—epoxy-coatedstrandofonesizecontainedinan
batch number.
individual shipping release or shipping order.
5.4 If specified in the purchase order or contract, patching
3.1.7 patching material, n—a liquid two-part epoxy coating
materialforrepairingdamagedepoxycoatingshallbesupplied
used to repair damaged coating, to coat the locations of
to the purchaser. The patching material shall be compatible
holidays on a coated strand, or to coat uncoated areas on the
with the coating and inert in concrete.The manufacturer of the
surface of a coated strand.
patching material shall specify the steel and epoxy surface
preparation, the minimum coating thickness, and the proce-
4. Ordering Information
dures for application of the patching material.
4.1 Orders for epoxy-coated seven-wire steel prestressing
strand under this specification shall contain the following 6. Surface Preparation
information:
6.1 The surface of the steel strand to be coated shall be
4.1.1 Nominal diameter of uncoated strand in accordance
cleaned chemically or by another method that will impart the
with Specification A416/A416M,
same cleanliness to ensure that the coated strand meets the
4.1.2 Grade of uncoated strand in accordance with Specifi-
requirements of Section 8.
cation A416/A416M (5.1),
4.1.3 Smooth or grit-impregnated coating (7.3).
7. Application of Coating
4.1.4 Quantity (in feet [metres]), and
7.1 The epoxy powder coating shall be applied to the
4.1.5 ASTM designationA882 [A882M] and year of issue.
cleaned surface as soon as possible after cleaning and before
4.2 Thepurchasershallhavetheoptiontospecifyadditional
oxidation of the surface visible to a person with normal or
requirements, including but not limited to, the following:
corrected vision occurs.
4.2.1 Certification of each batch of epoxy powder coating
7.2 The epoxy powder coating shall be applied by the
(5.2.1),
electrostatic deposition method, or other method that will meet
4.2.2 Representative sample of epoxy powder coating (5.3),
the coating requirements in Section 8, and fully cured in
4.2.3 Requirements for patching material (5.4),
accordance with the recommendations of the manufacturer of
4.2.4 Additional pull-out tests (9.1)
the epoxy powder coating.
4.2.5 Requirements for inspection (11.1),
4.2.6 Manufacturer’s quality control tests (13.1),
7.3 The epoxy coating on the surface of the strand shall be
4.2.7 Load-elongation curve (13.2),
smooth or grit-impregnated, as specified by the purchaser.
4.2.8 Packaging and package marking (Section 14),
7.3.1 For grit-impregnated coated strand, inert particles
4.2.9 Supplementary Requirement S1, and
(grit)shallbeimpregnatedintothesurfaceofthecoating.Such
4.2.10 Other special requirements, if any.
particles shall not cause the coating to fail the requirements of
Section 8. The particles shall be inert in concrete and non-
5. Materials
reactive with concrete additives and soluble salts.
5.1 Seven-wire steel prestressing strand to be coated shall 7.3.2 The epoxy coating on the surface of grit-impregnated
conform to Specification A416/A416M.The strand grade shall strand shall be capable of reaching a temperature of 150°F
A882/A882M−20
[66°C] without reducing the transfer of prestress by bond from 8.3.3 Fracture of an individual wire, or wires, or the strand
the strand to the surrounding concrete. itself in the bend test for adhesion of coating shall not be
considered as an adhesion failure of the coating, and another
NOTE 2—At temperatures above 165°F [74°C], currently available
specimen from the same production shift may be substituted.
epoxy begins to soften and lose its ability to transfer prestress from the
8.3.4 The adhesion of coating shall also be evaluated by a
strand to the concrete by bond. At 200°F [93°C] practically all transfer
capacity will be lost.
tension test in accordance with Section 9 of Test Methods
A1061/A1061M. The coated strand shall satisfy the require-
8. Requirements for Coated Strands
ments in Specification A416/A416M for breaking strength,
yield strength, and total elongation. No cracks visible to a
8.1 Thickness of Coating:
person with normal or corrected vision shall occur in the
8.1.1 The coating thickness after curing shall be 15 to 45
coating up to an elongation corresponding to the specified
mils [380 to 1140 µm].
minimum yield strength.
8.1.2 Thickness measurements shall be made in accordance
8.3.5 Specimen length for the bend test shall be at least 5 ft,
withSSPC-PA2,followingthemagneticgaugemanufacturer’s
0in.long[1500mm].Specimenlengthforthetensiontestshall
instructions for calibration and use; and in accordance with
conformtotherequirementsofTestMethodsA1061/A1061M.
Section5.2.1ofTestMethodD7091,thefoilshallbeplacedon
the surface of the uncoated strand instead of on the steel plate.
8.4 Bond with Concrete or Grout:
Pull-off or fixed probe gauges shall be used. “Pencil-type”
8.4.1 Pull-out tests shall be conducted on grit-impregnated
pull-off gauges that require the operator to observe the reading
coated strand to ensure proper bond properties. Pull-out speci-
at the instant the magnet is pulled from the surface shall not be
mens shall be cast in concrete cylinders with dimensions
used. The magnetic gauge shall be capable of measuring the
shown in Table 1. The untensioned strand shall be embedded
coatingthicknessofacoatedwireofcircularcross-sectionwith
concentricallyalongthelongitudinalaxisofthespecimen.The
a diameter in the range of 0.1 to 0.3 in. [2.5 to 7.5 mm]. The
minimumforceat0.001in.[0.025mm]slipshallbeappliedas
allowable error on a single measurement of the coating
shown in Fig. 1, by a hydraulic or mechanical jack when the
thickness on the coated crown of an outer wire of the strand
concrete reaches a compressive strength between 4000 and
shall be 65%.
5000psi[30and35MPa],andmeasuredwithacalibratedload
8.1.3 The coating thickness shall be measured on the crown
indicator at a slip of 0.001 in. [0.025 mm]. A dial gauge shall
of each of the six outer wires at least every 2000 ft [600 m] of
be used at the unloaded end to indicate slip. Minimum force at
continuous strand.
0.001 in. [0.025 mm] slip shall be at least equal to or greater
than the values shown in Table 1.
8.2 Continuity of Coating:
8.2.1 After application of the coating, a continuous in-line
9. Number of Tests
holiday detection procedure shall be employed using an
aqueous electrolyte and a holiday detector with a minimum
9.1 Three pullout tests shall be performed annually as a
voltage setting of 67.5 V DC, following the procedure fur-
minimum or repeated when a process change is made that
nished by its manufacturer. The approximate location of
could decrease the bond capacity of the epoxy-coated strand.
holidaysshallberecordedusingautomaticdevicesormarkings
The purchaser shall have the right to request additional pullout
on the strand for later patching.
teststobeperformedonthelotofepoxy-coatedstrandordered.
8.2.2 Duringthecontinuousholidaydetectionprocedure,all
holidays shall be coated with patching material in accordance
10. Retests
with the written recommendations of the patching material
10.1 If the specimen for coating thickness, continuity, ad-
manufacturer. Coating of the locations of the holidays shall be
hesion of coating, and pu
...