ASTM A1114/A1114M-20

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:A1114/A1114M −20
Standard Specification for
Low-Relaxation, Seven-Wire, Grade 240 [1655], Stainless
Steel Strand for Prestressed Concrete
ThisstandardisissuedunderthefixeddesignationA1114/A1114M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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
2.1 ASTM Standards:
1.1 This specification covers low-relaxation, seven-wire,
Grade 240 [1655], stainless steel strand for use in prestressed A1061/A1061M Test Methods for Testing Multi-Wire Steel
Prestressing Strand
concrete construction. Grade 240 [1655] has a minimum
tensile strength of 240 ksi [1655 MPa] based on the nominal A416/A416M Specification for Low-Relaxation, Seven-
Wire Steel Strand for Prestressed Concrete
area of the strand.
2.2 U.S. Military Standard:
1.2 The text of this specification references notes and
MIL-STD-129 Marking for Shipment and Storage
footnotes which provide explanatory material. These notes and
2.3 U.S. Federal Standard:
footnotes (excluding those in tables) shall not be considered as
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
requirements of the specification.
3. Terminology
1.3 This specification is applicable for orders in either
inch-pound units (as Specification A1114) or in SI units (as
3.1 Definitions of Terms Specific to This Specification:
Specification A1114M).
3.1.1 lay length, n—the axial distance required to make one
complete revolution of any outer wire of a strand.
1.4 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
3.1.2 strand, n—a group of wires having a center wire
each system are not necessarily exact equivalents; therefore, to
enclosed tightly by six helically placed outer wires.
ensure conformance with this specification, each system shall
3.1.2.1 Discussion—The direction of lay is either right-
be used independently of the other, and values from the two
handed or left-handed.
systems shall not be combined.
3.1.3 strand splice, n—a production connection between
1.5 This standard does not purport to address all of the two separate lengths of strand that is not intended to resist
safety concerns, if any, associated with its use. It is the prestressing forces.
responsibility of the user of this standard to establish appro-
3.1.4 wire weld, n—a resistance butt-weld joining two
priate safety, health, and environmental practices and deter-
separate lengths of wire after wire drawing and before the wire
mine the applicability of regulatory limitations prior to use.
is formed into strand.
1.6 This international standard was developed in accor-
4. Ordering Information
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4.1 Orders for low-relaxation, seven-wire, Grade 240
Development of International Standards, Guides and Recom-
[1655], stainless steel strand under this specification shall
mendations issued by the World Trade Organization Technical
contain the following information:
Barriers to Trade (TBT) Committee.
4.1.1 Quantity (feet [metres]),
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
This specification is under the jurisdiction ofASTM Committee A01 on Steel, contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee Standards volume information, refer to the standard’s Document Summary page on
A01.05 on Steel Reinforcement. the ASTM website.
Current edition approved March 1, 2020. Published March 2020. DOI: 10.1520/ Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
A1114_A1114M-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
A1114/A1114M−20
TABLE 1 Breaking Strength Requirements
from the thermal-mechanical treatment are considered normal
Minimum Weight [Mass] of for the finished appearance of this strand.
Nominal Diameter Steel Area of
Breaking Strength Strand,
of Strand, Strand,
of Strand, lb/1000 ft [kg/
2 2
6. Mechanical Property Requirements
in. [mm] in. [mm ]
lbf [kN] 1000 m]
6.1 Tests for mechanical properties shall be conducted in
Grade 240 [1655]
0.520 [13.2] 40 100 [179] 0.167 [108] 570 [840]
accordance with Test Methods A1061/A1061M.
0.620 [15.7] 55 400 [248] 0.231 [150] 780 [1 200]
6.2 Breaking Strength—The breaking strength of the fin-
ished strand shall conform to the requirements prescribed in
Table 1.
TABLE 2 Yield Strength Requirements
Nominal Diameter of Minimum Load at 1.0 %
6.3 Yield Strength—Yield strength in pounds [kN] shall be
Initial Load,
Strand, Extension,
measured at 1.0 % extension under load. The minimum yield
lbf [kN]
in. [mm] lbf [kN]
strength shall be 90 % of the breaking strength listed in Table
Grade 240 [1655]
1. Initial loads for the test and minimum yield strengths are
0.520 [13.2] 4 010 [17.9] 36 100 [161.1]
0.620 [15.7] 5 540 [24.8] 49 860 [223.2]
listed in Table 2.
6.3.1 The extension under load shall be measured by an
extensometer calibrated with the smallest division not larger
TABLE 3 Diameter Relation Between Center and Outer Wires
than 0.0001 in./in. [0.0001 mm/mm] of gage length.
Minimum Difference Between Center
6.4 Elongation—The total elongation under load shall not
Nominal Diameter of Strand, Wire Diameter and Diameter of Any
in. [mm] Outer Wire,
be less than 1.4 % using a gage length of not less than 24 in.
in. [mm]
[600 mm]. It shall be permissible to determine the total
Grade 240 [1655]
elongation value by adding, to the 1.0 % yield extension, the
0.520 [13.2] 0.003 [0.076]
percent extension or movement between the jaws gripping the
0.620 [15.7] 0.004 [0.102]
strand after yield determination. The percent is calculated on
the new base length of jaw-to-jaw distance. (Warning—The
total elongation of this material is significantly less than a
similar material; see Specification A416/A416M. As a result,
4.1.2 Nominal diameter of strand (inches [millimetres]),
special care and attention is needed when designing structural
4.1.3 ASTM designation A1114 [A1114M] and year of
members. Also, appropriate safety precautions should be con-
issue.
sidered when stressing.)
4.2 Thepurchasershallhavetheoptiontospecifyadditional
6.5 Relaxation Properties—Strand shall have relaxation
requirements, including but not limited to, the following:
losses of not more than 2.5 % when initially loaded to 70 % of
4.2.1 Relaxation evidence for similarly dimensioned Grade
specified minimum breaking strength or not more than 3.5 %
240 [1655] strand (6.5.1),
when loaded to 80 % of specified minimum breaking strength
4.2.2 If specially dimensioned strand is permitted (7.5),
of the strand after 1000 hours of testing.
4.2.3 If strand splices are permitted (8.1.1)
6.5.1 Ifrequired,relaxationevidenceshallbeprovidedfrom
4.2.4 Weldless strand (8.2.2),
the manufacturer’s records of tests on similarly dimensioned
4.2.5 Requirements for inspection (11.1),
Grade 240 [1655] strand.
4.2.6 Load-elongation curve (13.2),
7. Dimensions and Permissible Variations
4.2.7 Packaging and package marking (Section 14), and
4.2.8 Other special requirements, if any.
7.1 The size of the finished strand shall be expressed as the
nominal diameter of the strand in inches [millimetres].
5. Materials and Manufacture
7.2 The diameter of the center wire of any strand shall be
5.1 Base Metal—The base metal shall be dupl
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