ASTM A722/A722M-06

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Designation: A 722/A 722M – 06
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* 3.1.1 Quantity,
3.1.2 Name of material (uncoated high-strength bars for
1.1 This specification covers uncoated high-strength steel
prestressing concrete),
bars intended for use in pretensioned and post-tensioned
3.1.3 ASTM designation and year of issue,
prestressed concrete construction or in prestressed ground
3.1.4 Size and length,
anchors. Bars are of a minimum ultimate tensile strength level
3.1.5 Type,
of 1035 MPa (150 000 psi).
3.1.6 Special inspection requirements, if desired (see Sec-
1.2 Two types of bars are provided: Type I bar has a plain
tion 12),
surface and Type II bar has surface deformations.
3.1.7 Special preparation for delivery, if desired (see Sec-
1.3 Supplementary requirements of an optional nature are
tion 11), and
provided. They shall apply only when specified by the pur-
3.1.8 Supplementary requirements, if desired.
chaser.
1.4 The values stated in SI units are to be regarded as the
NOTE 1—A typical ordering description is as follows: 50 uncoated
standard. The values given in parentheses are for information high-strength steel bars for prestressing concrete to ASTM A722/
A722M–__; 26 mm diameter, 12.20 m long, Type II; packed in
only.
accordance with A700; meeting supplementary bending properties.
2. Referenced Documents
4. Materials and Manufacture
2
2.1 ASTM Standards:
4.1 Thebarsshallberolledfromproperlyidentifiedheatsof
A370 TestMethodsandDefinitionsforMechanicalTesting
ingot cast or strand cast steel. The standard sizes and dimen-
of Steel Products
sions of Type I and II bars shall be those listed in Table 1 and
A700 Practices for Packaging, Marking, and Loading
Table 2, respectively.
Methods for Steel Products for Shipment
4.2 The bars shall be subjected to cold-stressing to not less
E30 Test Methods for Chemical Analysis of Steel, Cast
3
than 80% of the minimum ultimate strength, and then shall be
Iron, Open-Hearth Iron, and Wrought Iron
stress-relieved, to produce the prescribed mechanical proper-
2.2 Government Standards
ties.
MIL-STD-129 Marking for Shipment and Storage
2.3 U.S. Federal Standards
5. Chemical Composition
Fed. Std. 123 Marking for Shipment (Civil Agencies)
5.1 An analysis of each heat of steel shall be made by the
3. Ordering Information manufacturer from test samples taken during the pouring of
each heat.
3.1 Orders for material under this specification should
5.1.1 Choice and use of chemical composition and alloying
include the following information:
elements, to produce the mechanical properties of the finished
bar prescribed in 6.2, shall be made by the manufacturer,
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel,
subject to the limitations in 5.1.2.
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
5.1.2 On heat analysis, phosphorus and sulfur shall not
A01.05 on Steel Reinforcement.
exceed the following:
Current edition approved Sept. 1, 2006. Published September 2006. Originally
approved in 1975. Last previous edition approved in 2005 asA722/A722M – 05. Phosphorus 0.040 %
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Sulfur 0.050 %
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
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 – 06
TABLE 1 Dimensions for Type I (Plain) Bar
6.5.1 If any tensile property of any tension test specimen is
A
Nominal Diameter Nominal Mass (Weight) Nominal Area less than that specified, and any part of the fracture is outside
2 2
the middle third of the gage length, as indicated by scribe
mm in. kg/m lb/ft mm in.
scratches marked on the specimen before testing, a retest shall
3
19 ⁄4 2.23 1.50 284 0.44
7
22 ⁄8 3.04 2.04 387 0.60 be allowed.
25 1 3.97 2.67 503 0.78
6.5.2 If the results of an original tension test fail to meet
1
29 1 ⁄8 5.03 3.38 639 0.99
specified requirements, two additional tests shall be made on
1
32 1 ⁄4 6.21 4.17 794 1.23
3
35 1 ⁄8 7.52 5.05 955 1.48 samples of bar from the same heat and bar size, and if failure
A
occurs in either of these tests, the bar size
...