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

ABSTRACT
This test method deals with the standard procedures for establishing the relative bond strength of Grade 270 prestressing steel strands of specified diameter in cement grout as used in prestressed ground anchors for evaluating the effects of manufacturing practices on bond strength. The bond strength values obtained shall not be used to design the bond strength of ground anchors that depend on field conditions. This test method is not intended to be used as a bond test for pretensioned concrete applications. The test specimen shall be cut from standard production coils and shall not be wiped or cleaned. Pull test shall be made in accordance with the method.
SIGNIFICANCE AND USE
4.1 Seven-wire steel strand is used in pre-tensioned and post-tensioned concrete construction.  
4.2 0.600 in. [15.24 mm] diameter, Grade 270 seven-wire steel strand is used to make prestressed ground anchors which are often bonded to cement grout.  
4.3 Manufacturing processes, subsequent handling, and storage conditions may influence the strand bond.  
4.4 The primary use of this test method is to establish the relative bond strength of 0.600 in. [15.24 mm] seven-wire steel strand.  
4.5 The relative bond strength is determined by recording the pullout force at a certain displacement of the strand.
SCOPE
1.1 This test method describes procedures to establish the relative bond strength of 0.600 in. [15.24 mm] diameter, Grade 270 [1860] seven-wire steel strand in cement grout as used in prestressed ground anchors for the purpose of evaluating the effects of manufacturing practices on bond strength.  
1.2 The bond strength values obtained are not intended to be used to design the bond length of ground anchors that depend on field conditions.  
1.3 This test method is not intended to be used as a bond test for prestressed concrete applications.  
1.4 The values stated in either inch-pound or SI units are to be regarded 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 standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 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: 31-Aug-2023
• 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

• Replaces: ASTM A981/A981M-11(2016) - 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-Sep-2023
• Referred By: ASTM A882/A882M-20 - Standard Specification for Filled Epoxy-Coated Seven-Wire Steel Prestressing Strand
• Effective Date: 01-Sep-2023
• Referred By: ASTM A416/A416M-18 - Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-Sep-2023

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: 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
1
Prestressed Ground Anchors
This standard is issued under the fixed designation A981/A981M; 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 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method describes procedures to establish the
A416/A416M Specification for Low-Relaxation, Seven-
relative bond strength of 0.600 in. [15.24 mm] diameter, Grade
Wire Steel Strand for Prestressed Concrete
270 [1860] seven-wire steel strand in cement grout as used in
A882/A882M Specification for Filled Epoxy-Coated Seven-
prestressed ground anchors for the purpose of evaluating the
Wire Steel Prestressing Strand
effects of manufacturing practices on bond strength.
C109/C109M Test Method for Compressive Strength of
1.2 The bond strength values obtained are not intended to be
Hydraulic Cement Mortars (Using 2-in. or [50 mm] Cube
used to design the bond length of ground anchors that depend
Specimens)
on field conditions.
C150 Specification for Portland Cement
C511 Specification for Mixing Rooms, Moist Cabinets,
1.3 This test method is not intended to be used as a bond test
Moist Rooms, and Water Storage Tanks Used in the
for prestressed concrete applications.
Testing of Hydraulic Cements and Concretes
1.4 The values stated in either inch-pound or SI units are to
E4 Practices for Force Calibration and Verification of Test-
be regarded as standard. Within the text, the SI units are shown
ing Machines
in brackets. The values stated in each system may not be exact
3. Terminology
equivalents; therefore, each system shall be used independently
of the other. Combining values from the two systems may
3.1 Definitions of Terms Specific to This Test Method:
result in non-conformance with the standard.
3.1.1 bond strength, n—maximum measured load in a pull
test on a 0.600 in. [15.24 mm] diameter seven-wire steel strand
1.5 This standard does not purport to address all of the
embedded in cement grout.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1.2 bonded length, n—the length of the test strand that is
priate safety, health, and environmental practices and deter-
in contact with the cement grout.
mine the applicability of regulatory limitations prior to use.
4. Significance and Use
1.6 This international standard was developed in accor-
4.1 Seven-wire steel strand is used in pre-tensioned and
dance with internationally recognized principles on standard-
post-tensioned concrete construction.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4.2 0.600 in. [15.24 mm] diameter, Grade 270 seven-wire
mendations issued by the World Trade Organization Technical
steel strand is used to make prestressed ground anchors which
Barriers to Trade (TBT) Committee.
are often bonded to cement grout.
4.3 Manufacturing processes, subsequent handling, and
storage conditions may influence the strand bond.
1
This test method is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
2
A01.05 on Steel Reinforcement. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2023. Published October 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1997. Last previous edition approved in 2016 as A981/A981M – 11 Standards volume information, refer to the standard’s Document Summary page on
(2016). DOI: 10.1520/A0981_A0981M-23. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A981/A981M − 23
4.4 The primary use of this test method is to establish the
relative bond strength of 0.600 in. [15.24 mm] seven-wire steel
strand.
4.5 The relative bond strength is determined by recording
the pullout force at a certain displacement of the strand.
5. Apparatus
5.1 Equipment—A suitable tensile testing machine or load
frame shall be used. The loading system shall be calibrated in
accordance with Practices E4. The test system shall have
sufficient capacity to prevent yielding of i
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A981/A981M − 11 (Reapproved 2016) A981/A981M − 23
Standard Test Method for
Evaluating Bond Strength for 0.600-in. [15.24-mm] Diameter
Seven-Wire Steel Prestressing Strand, Grade 270 [1860],
1
Uncoated, Used in Prestressed Ground Anchors
This standard is issued under the fixed designation A981/A981M; 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
1.1 This test method describes procedures to establish the relative bond strength of 0.600-in. [15.24-mm]0.600 in. [15.24 mm]
diameter, Grade 270 [1860] seven-wire steel prestressing strand in cement grout as used in prestressed ground anchors for the
purpose of evaluating the effects of manufacturing practices on bond strength.
1.2 The bond strength values obtained are not intended to be used to design the bond length of ground anchors that depend on
field conditions.
1.3 This test method is not intended to be used as a bond test for prestressed concrete applications.
1.4 The values stated in either inch-pound or SI units are to be regarded 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 standard.
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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.6 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A416/A416M Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
A882/A882M Specification for Filled Epoxy-Coated Seven-Wire Steel Prestressing Strand
C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50 mm] Cube Specimens)
C150 Specification for Portland Cement
1
This test method is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.05
on Steel Reinforcement.
Current edition approved Sept. 1, 2016Sept. 1, 2023. Published September 2016October 2023. Originally approved in 1997. Last previous edition approved in 20112016
as A981 – 11.A981/A981M – 11 (2016). DOI: 10.1520/A0981_A098M-11R16.10.1520/A0981_A0981M-23.
2
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 the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A981/A981M − 23
C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic
Cements and Concretes
C1019 Test Method for Sampling and Testing Grout for Masonry
E4 Practices for Force Calibration and Verification of Testing Machines
3. Terminology
3.1 Definitions of Terms Specific to This Standard:Test Method:
3.1.1 bond strength—strength, n—maximum measured load in a pull test on a 0.600-in. [15.24-mm] diameter steel prestressing
0.600 in. [15.24 mm] diameter seven-wire steel strand embedded in cement grout.
3.1.2 bonded length—length, n—the length of the test strand that is in contact with the cement grout.
4. Significance and Use
4.1 Seven-wire steel strand is used in pre-tensioned and post-tensioned concrete construction.
4.2 0.600 in. [15.24 mm] diameter, Grade 270 seven-wire steel strand is used to make prestressed ground anchors which are often
bonded to cement grout.
4.3 Manufacturing processes, subsequent handling, and storage conditions may influence the strand bond.
4.4 The primary use of this test method is to establish the relati
...