ASTM A722/A722M-07
(Specification)Standard Specification for Uncoated High-Strength Steel Bars for Prestressing Concrete
Standard Specification for Uncoated High-Strength Steel Bars for Prestressing Concrete
ABSTRACT
This specification covers uncoated high-strength steel bars intended for use in pretensioned and post-tensioned prestressed concrete construction or in prestressed ground anchors. Two types of bars are considered: Type I bar, which has a plain surface; and Type II bar, which has surface deformations. The bars shall be rolled from properly identified heats of ingot cast or strand cast steel. The bars shall be subjected to cold-stressing and then shall be stress-relieved to produce the prescribed mechanical properties. Yield strength, elongation, and tension tests shall be performed.
SCOPE
1.1 This specification covers uncoated high-strength steel bars intended for use in pretensioned and post-tensioned prestressed concrete construction or in prestressed ground anchors. Bars are of a minimum ultimate tensile strength level of 1035 MPa (150000 psi).
1.2 Two types of bars are provided: Type I bar has a plain surface and Type II bar has surface deformations.
1.3 Supplementary requirements of an optional nature are provided. They shall apply only when specified by the purchaser.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
General Information
Relations
Buy Standard
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A722/A722M – 07
Standard Specification for
Uncoated High-Strength Steel Bars for Prestressing
1
Concrete
This standard is issued under the fixed designationA722/A722M; the number immediately following the designation indicates the year
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3. Ordering Information
1.1 This specification covers uncoated high-strength steel 3.1 Orders for material under this specification should
bars intended for use in pretensioned and post-tensioned include the following information:
prestressed concrete construction or in prestressed ground 3.1.1 Quantity,
anchors. Bars are of a minimum ultimate tensile strength level 3.1.2 Name of material (uncoated high-strength bars for
of 1035 MPa (150 000 psi). prestressing concrete),
1.2 Two types of bars are provided: Type I bar has a plain 3.1.3 ASTM designation and year of issue,
surface and Type II bar has surface deformations. 3.1.4 Size and length,
1.3 Supplementary requirements of an optional nature are 3.1.5 Type,
provided. They shall apply only when specified by the pur- 3.1.6 Special inspection requirements, if desired (see Sec-
chaser. tion 12),
1.4 The values stated in SI units are to be regarded as the 3.1.7 Special preparation for delivery, if desired (see Sec-
standard. The values given in parentheses are for information tion 11),
only. 3.1.8 Load-elongation curve, if required (see Section 15),
and
2. Referenced Documents
3.1.9 Supplementary requirements, if desired.
2
2.1 ASTM Standards:
NOTE 1—A typical ordering description is as follows: 50 uncoated
A370 Test Methods and Definitions for Mechanical Testing
high-strength steel bars for prestressing concrete to ASTM A722/
of Steel Products
A722M–__; 26 mm diameter, 12.20 m long, Type II; packed in
A700 PracticesforPackaging,Marking,andLoadingMeth-
accordance with A700; meeting supplementary bending properties.
ods for Steel Products for Shipment
4. Materials and Manufacture
E30 Test Methods for Chemical Analysis of Steel, Cast
3
Iron, Open-Hearth Iron, and Wrought Iron 4.1 Thebarsshallberolledfromproperlyidentifiedheatsof
4
2.2 Government Standards: ingot cast or strand cast steel. The standard sizes and dimen-
MIL-STD-129 Marking for Shipment and Storage sions of Type I and II bars shall be those listed in Table 1 and
4
2.3 U.S. Federal Standards: Table 2, respectively.
Fed. Std. 123 Marking for Shipment (Civil Agencies) 4.2 The bars shall be subjected to cold-stressing to not less
than 80% of the minimum ultimate strength, and then shall be
stress-relieved, to produce the prescribed mechanical proper-
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, ties.
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
5. Chemical Composition
Current edition approved March 1, 2007. Published March 2007. Originally
5.1 An analysis of each heat of steel shall be made by the
approved in 1975. Last previous edition approved in 2005 as A722/A722M– 06.
DOI: 10.1520/A0722_A0722M-07.
manufacturer from test samples taken during the pouring of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
each heat.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1.1 Choice and use of chemical composition and alloying
Standards volume information, refer to the standard’s Document Summary page on
elements, to produce the mechanical properties of the finished
the ASTM website.
3
Withdrawn. The last approved version of this historical standard is referenced
bar prescribed in 6.2, shall be made by the manufacturer,
on www.astm.org.
subject to the limitations in 5.1.2.
4
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
5.1.2 On heat analysis, phosphorus and sulfur shall not
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
www.dodssp.daps.mil. exceed the following:
*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.
1
---------------------- Page: 1 ----------------------
A722/A722M – 07
TABLE 1 Dimensions for Type I (Plain) Bar
6.5 Retests:
A
Nominal Diameter Nominal Mass (Weight) Nominal Area 6.5.1 If any tensile property of any tension test specimen is
2 2
less than that specified, and any part of the fracture is outside
mm in. kg/m lb/ft mm in.
the middle third of the gage length, as indicated by scribe
3
19 ⁄4 2.23 1.50 284 0.44
7
22 ⁄8 3.04 2.04 387 0.60 scratches marked on the specimen before testing, a retest shall
25 1 3.97 2.67 503 0.78
be al
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:A 722/A 722M–06 Designation: A722/A722M – 07
Standard Specification for
Uncoated High-Strength Steel Bars for Prestressing
1
Concrete
This standard is issued under the fixed designationA722/A722M; the number immediately following the designation indicates the year
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers uncoated high-strength steel bars intended for use in pretensioned and post-tensioned prestressed
concrete construction or in prestressed ground anchors. Bars are of a minimum ultimate tensile strength level of 1035 MPa
(150 000 psi).
1.2 Two types of bars are provided: Type I bar has a plain surface and Type II bar has surface deformations.
1.3 Supplementary requirements of an optional nature are provided. They shall apply only when specified by the purchaser.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment
3
E30 Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron
2.2 Government Standards
4
MIL-STD-129Marking for Shipment and Storage Government Standards:
MIL-STD-129 Marking for Shipment and Storage
4
2.3 U.S. Federal Standards:
Fed. Std. 123 Marking for Shipment (Civil Agencies)
3. Ordering Information
3.1 Orders for material under this specification should include the following information:
3.1.1 Quantity,
3.1.2 Name of material (uncoated high-strength bars for prestressing concrete),
3.1.3 ASTM designation and year of issue,
3.1.4 Size and length,
3.1.5 Type,
3.1.6 Special inspection requirements, if desired (see Section 12),
3.1.7 Special preparation for delivery, if desired (see Section 11),
3.1.8 Load-elongation curve, if required (see Section 15), and
3.1.89 Supplementary requirements, if desired.
NOTE 1—Atypical ordering description is as follows: 50 uncoated high-strength steel bars for prestressing concrete toASTMA722/A722M–__; 26
mm diameter, 12.20 m long, Type II; packed in accordance with A 700;A700; meeting supplementary bending properties.
4. Materials and Manufacture
4.1 The bars shall be rolled from properly identified heats of ingot cast or strand cast steel. The standard sizes and dimensions
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel,Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
Current edition approved Sept. 1, 2006. Published September 2006. Originally approved in 1975. Last previous edition approved in 2005 as A 722/A 722M – 05.
Current edition approved March 1, 2007. Published March 2007. Originally approved in 1975. Last previous edition approved in 2005 as A722/A722M– 06. DOI:
10.1520/A0722_A0722M-07.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Withdrawn.
3
Withdrawn. The last approved version of this historical standard is referenced on www.astm.org.
4
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://www.dodssp.daps.mil.
*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.
1
---------------------- Page: 1 ----------------------
A722/A722M – 07
of Type I and II bars shall be those listed in Table 1 and Table 2, respectively.
4.2 The bars shall be subjected to cold-stressing to not less than 80% of the minimum ultimate strength, and then shall be
stress-relieved, to produce the prescribed mechanical properties.
5. Chemical Composition
5.1 Ananalysisofeachheatofsteelshallbemadebythemanufacturerfromtestsamplestakenduringthepouringofeachheat.
5.1.1 Choice and use of chemical composition and alloying elements, to produce the mechanical properties of the finished bar
prescribed in 6.2, shall be made by the manufacturer, subject to the limitations in 5.1.2.
5.1.2 On heat analysis, phosphorus and
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.