ASTM A722/A722M-05

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Designation: A 722/A 722M – 05
Standard Specification for
Uncoated High-Strength Steel Bars for Prestressing
1
Concrete
ThisstandardisissuedunderthefixeddesignationA722/A722M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* 3.1.3 ASTM designation and year of issue,
3.1.4 Size and length,
1.1 This specification covers uncoated high-strength steel
3.1.5 Type,
bars intended for use in pretensioned and post-tensioned
3.1.6 Special inspection requirements, if desired (see Sec-
prestressed concrete construction or in prestressed ground
tion 12),
anchors. Bars are of a minimum ultimate tensile strength level
3.1.7 Special preparation for delivery, if desired (see Sec-
of 1035 MPa (150 000 psi).
tion 11), and
1.2 Two types of bars are provided: Type I bar has a plain
3.1.8 Supplementary requirements, if desired.
surface and Type II bar has surface deformations.
1.3 Supplementary requirements of an optional nature are
NOTE 1—A typical ordering description is as follows: 50 uncoated
provided. They shall apply only when specified by the pur-
high-strength steel bars for prestressing concrete to ASTM A722/
A722M–__; 26 mm diameter, 12.20 m long, Type II; packed in
chaser.
accordance with A700; meeting supplementary bending properties.
1.4 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Materials and Manufacture
only.
4.1 Thebarsshallberolledfromproperlyidentifiedheatsof
2. Referenced Documents ingot cast or strand cast steel. The standard sizes and dimen-
2
sions of Type I and II bars shall be those listed in Table 1 and
2.1 ASTM Standards:
Table 2, respectively.
A370 TestMethodsandDefinitionsforMechanicalTesting
4.2 The bars shall be subjected to cold-stressing to not less
of Steel Products
than 80% of the minimum ultimate strength, and then shall be
A700 Practices for Packaging, Marking, and Loading
stress relieved, to produce the prescribed mechanical proper-
Methods for Steel Products for Domestic Shipment
ties.
E30 Test Methods for Chemical Analysis of Steel, Cast
3
Iron, Open-Hearth Iron, and Wrought Iron
5. Chemical Composition
3. Ordering Information 5.1 An analysis of each heat of steel shall be made by the
manufacturer from test samples taken during the pouring of
3.1 Orders for material under this specification should
each heat.
include the following information:
5.1.1 Choice and use of chemical composition and alloying
3.1.1 Quantity,
elements, to produce the mechanical properties of the finished
3.1.2 Name of material (uncoated high-strength bars for
bar prescribed in 6.2, shall be made by the manufacturer,
prestressing concrete),
subject to the limitations in 5.1.2.
5.1.2 On heat analysis, phosphorus and sulfur shall not
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This specification is under the jurisdiction ofASTM CommitteeA01 on Steel,
exceed the following:
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
Phosphorus 0.040 %
A01.05 on Steel Reinforcement.
Sulfur 0.050 %
Current edition approved March 1, 2005. Published March 2005. Originally
approved in 1975. Last previous edition approved in 2003 as A722/A722M – 98
5.2 Aproduct analysis may be made by the purchaser from
(2003).
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the finished bar representing each cast or heat of steel. The
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
phosphorus and sulfur contents thus determined shall not
Standards volume information, refer to the standard’s Document Summary page on
exceed the limits specified in 5.1.2 by 0.008%.
the ASTM website.
3 5.3 Test MethodsE30 shall be used for referee purposes.
Withdrawn.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A 722/A 722M – 05
TABLE 1 Dimensions for Type I (Plain) Bar
6.5.2 If the results of an original tension test fail to meet
A
Nominal Diameter Nominal Mass (Weight) Nominal Area specified requirements, two additional tests shall be made on
2 2
samples of bar from the same heat and bar size, and if failure
mm in. kg/m lb/ft mm in.
occurs in either of these tests, the bar size from that heat shall
3
19 ⁄4 2.23 1.50 284 0.44
7
22 ⁄8 3.04 2.04 387 0.60 be rejected.
25 1 3.97 2.67 503 0.78
6.5.3 If any test specimen fails because of mechanical
1
29 1 ⁄8 5.03 3.38 639 0.99
reasons such as failure of testing equipment, it shall be
1
32 1 ⁄4 6.21 4.17 794 1.23
3
35
...