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

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.
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] 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 health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Mar-2011
• ICS: 91.080.10 - Metal structures
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.05 - Steel Reinforcement

Relations

• Replaces: ASTM A981-97(2007) - Standard Test Method for Evaluating Bond Strength for 15.2 mm (0.6 in.) Diameter Prestressing Steel Strand, Grade 270, Uncoated, Used in Prestressed Ground Anchors
• Effective Date: 01-Apr-2011
• Referred By: ASTM A882/A882M-20 - Standard Specification for Filled Epoxy-Coated Seven-Wire Steel Prestressing Strand
• Effective Date: 01-Apr-2011
• Referred By: ASTM A416/A416M-18 - Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-Apr-2011

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: A981/A981M − 11
StandardTest Method for
Evaluating Bond Strength for 0.600-in. [15.24-mm] Diameter
Steel Prestressing Strand, Grade 270 [1860], Uncoated,
1
Used in Prestressed Ground Anchors
This standard is issued under the fixed designationA981/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 Testing of Hydraulic Cements and Concretes
C1019 Test Method for Sampling and Testing Grout
1.1 This test method describes procedures to establish the
E4 Practices for Force Verification of Testing Machines
relativebondstrengthof0.600-in.[15.24-mm]diameter,Grade
270 [1860] steel prestressing strand in cement grout as used in
3. Terminology
prestressed ground anchors for the purpose of evaluating the
3.1 Definitions of Terms Specific to This Standard:
effects of manufacturing practices on bond strength.
3.1.1 bond strength—maximum measured load in a pull test
1.2 Thebondstrengthvaluesobtainedarenotintendedtobe
on a 0.600-in. [15.24-mm] diameter steel prestressing strand
used to design the bond length of ground anchors that depend
embedded in cement grout.
on field conditions.
3.1.2 bonded length—the length of the test strand that is in
1.3 Thistestmethodisnotintendedtobeusedasabondtest
contact with the cement grout.
for prestressed concrete applications.
4. Apparatus
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
4.1 Equipment—A suitable tensile testing machine or load
in brackets. The values stated in each system may not be exact
frame shall be used. The loading system shall be calibrated in
equivalents;therefore,eachsystemshallbeusedindependently
accordance with Practices E4. The test system shall have
of the other. Combining values from the two systems may
sufficient capacity to prevent yielding of its various compo-
result in non-conformance with the standard.
nents and shall ensure that the applied tensile load remains
1.5 This standard does not purport to address all of the parallel to the axis of the steel prestressing strand during
safety concerns, if any, associated with its use. It is the testing.
responsibility of the user of this standard to establish appro-
4.2 Strand Displacement Measurements—Displacements of
priate safety and health practices and determine the applica-
the free end of the steel prestressing strand shall be measured
bility of regulatory limitations prior to use.
with respect to the loaded surface of the test specimen using
suitable measurement devices. Dial gages having the smallest
2. Referenced Documents
division of not more than 0.001 in. [25 µm] or linear variable
2
2.1 ASTM Standards:
differential transformers (LVDTs) with equal or superior accu-
A416/A416M Specification for Steel Strand, Uncoated
racy are examples of satisfactory devices.
Seven-Wire for Prestressed Concrete
C150 Specification for Portland Cement 5. Strand Bond Test Specimen
C511 Specification for Mixing Rooms, Moist Cabinets,
5.1 Steel Prestressing Strand—Strand shall be 0.600-in.
Moist Rooms, and Water Storage Tanks Used in the
[15.24-mm] diameter, Grade 270 [1860] and comply with
Specification A416/A416M and shall be cut from standard
production coils prior to packaging. The surface of the test
1
This test method is under the jurisdiction of ASTM Committee A01 on Steel,
samples shall not be wiped or cleaned in order to preserve their
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
original condition. Minimum recommended sample length is
Current edition approved April 1, 2011. Published May 2011. Originally
30 in. [750 mm].
approved in 1997. Last previous edition approved in 2007 as A981 – 97 (2007).
DOI: 10.1520/A0981_A098M-11.
5.2 Test Specimen Fabrication—The test specimen shall
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
consist of the steel prestressing strand embedded in cement
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
grout and centered inside a steel pipe, 5-in. [125-mm] O.D.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. with a 0.125-in. [3-mm] thick wall, 18-in. [450-mm] long with
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A981/A981M − 11
a 6 by 6 by 0.25 in. [150 by 150 by 6 mm] base plate welded shown in Fig. 1. A sealing agent shall be applied around the
to one end of the steel pipe, or o
...

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:A981–97 (Reapproved 2007) Designation: A981/A981M – 11
Standard Test Method for
Evaluating Bond Strength for 15.2 mm (0.6 in.) 0.600-in.
[15.24-mm] Diameter Prestressing Steel Prestressing
Strand, Grade 270 [1860], Uncoated, Used in Prestressed
1
Ground Anchors
This standard is issued under the fixed designationA981/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
1.1This test method describes procedures to establish the relative bond strength of 15.2 mm (0.6 in.) diameter, Grade 270
prestressing steel strand in cement grout as used in prestressed ground anchors for the purpose of evaluating the effects of
manufacturing practices on bond strength.
1.2The bond strength values obtained shall not be used to design the bond length of ground anchors that depend on field
conditions.
1.3This test method is not intended to be used as a bond test for pretensioned concrete applications.
1.4The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.1 This test method describes procedures to establish the relative bond strength of 0.600-in. [15.24-mm] diameter, Grade 270
[1860] 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 health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A416/A416M Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete
C150 Specification for Portland Cement
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
E4 Practices for Force Verification of Testing Machines
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 bond strength—maximum measured load in a pull test on a 15.2 mm (0.6 in.) 0.600-in. [15.24-mm] diameter prestressing
steel prestressing strand embedded in cement grout.
1
This test method is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of SubcommitteeA01.05
on Steel Reinforcement.
Current edition approved Sept. 1, 2007. Published September 2007. Originally approve din 1997. Last previous edition approved in 2002 as A981–97(2002). DOI:
10.1520/A0981-97R07.
Current edition approved April 1, 2011. Published May 2011. Originally approved in 1997. Last previous edition approved in 2007 as A981 – 97 (2007). DOI:
10.1520/A0981_A098M-11.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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 – 11
3.1.2 bonded length—the length of the test strand that is in contact with the cement grout.
4. Apparatus
4.1 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 its various components and shall
ensure that the applied tensile load remains parallel to the axis of the prestre
...