GB/T 21839-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 21839-2019 | English | 440 |
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Test methods of steel for prestressing concrete
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| GB/T 21839-2008 | English | 200 |
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Steel for prestressed concrete -- Test methods
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GB/T 21839-2019: Test methods of steel for prestressing concrete---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT21839-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
H 49
Replacing GB/T 21839-2008
Test methods of steel for prestressing concrete
(ISO 15630-3.2010, Steel for the reinforcement and prestressing of concrete –
Test methods – Part 3.Prestressing steel, MOD)
Issued on. JUNE 04, 2019
Implemented on. MAY 01, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 4
1 Scope... 6
2 Normative references... 6
3 Symbols and description... 7
4 General requirements for specimen... 9
5 Tensile test... 9
6 Bending test... 12
7 Repeated bending test... 13
8 Torsion test... 14
9 Winding and coating adhesion test... 15
10 Isothermal relaxation test... 15
11 Axial force fatigue test... 20
12 Stress corrosion test in thiocyanate solution... 22
13 Deflection tensile test... 25
14 Chemical analysis... 29
15 Geometry measurement... 29
16 Determination of relative rib area (fR)... 32
17 Determination of the deviation of nominal mass per meter... 34
18 Testing of anti-corrosion grease content... 35
19 Sheath thickness measurement... 36
20 Coating uniformity test... 36
21 Zinc layer quality test... 36
22 Test report... 37
Appendix A (Informative) List of comparisons between this standard and ISO
15630-3.2010... 38
Appendix B (Informative) The technical differences between this standard and
ISO 15630-3.2010 and their reasons... 39
Appendix C (Informative) Tensile test method of steel strand for prestressed
concrete... 40
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 21839-2008 "Test methods of steel for
prestressing concrete". Compared with GB/T 21839-2008, the main technical
changes except for editorial changes are as follows.
- MODIFY the normative references (see Chapter 2; Chapter 2 of the 2008
edition);
- MODIFY and ADD some symbols (see Chapter 3; Chapter 3 of the 2008
edition);
- MODIFY the general provisions of the specimen (see Chapter 4; Chapter 4
of the 2008 edition);
- MODIFY the tensile test; ADD the requirements for tensile specimens; ADD
the parameters A and Z to the tensile test measurement; ADD that the
measurement of Agt can use manual methods according to GB/T 228.1;
REFINE the measurement of elastic modulus (E) (see 5.3.2);
- MODIFY the determination of the bending test results (see 6.4, 6.4 of the
2008 edition);
- ADD the content of repeated bending test equipment (see 7.2)
- ADD the coating adhesion test (see Chapter 9);
- MODIFY the relevant technical requirements for extensometers (see
Chapter 5 and Appendix C; Chapter 5 and Appendix A of the 2008 edition);
- In the stress corrosion test solution, ADD the safety tips for chemical
reagents (see 12.3.5);
- ADD the requirements for notch length (see 15.3.2.4);
- ADD the testing of the anti-corrosion grease content (see Chapter 18);
- ADD the sheath thickness measurement (see Chapter 19);
- ADD the coating uniformity test (see Chapter 20);
- ADD the zinc layer quality test (see Chapter 21).
This standard uses the redrafting method to amend and adopt ISO 15630-
3.2010 "Steel for the reinforcement and prestressing of concrete – Test
methods - Part 3.Prestressing steel".
Compared with ISO 15630-3.2010, this standard has many adjustments in
structure. Appendix A lists the comparison of clause numbers between this
standard and ISO 15630-3.2010.
Compared with ISO 15630-3.2010, there are technical differences between this
standard. The terms of these differences have been marked by a vertical single
line (|) on the outer margin of the standard. Appendix B gives a list of
corresponding technical differences and their reasons.
This standard also made the following editorial changes.
- ADD the informative Appendix A. List of comparisons of clause numbers
between this standard and ISO 15630-3.2010.
- ADD the informative Appendix B. The technical differences between this
standard and ISO 15630-3.2010 and their reasons.
- ADD the informative Appendix C. Tensile test method of steel strand for
prestressing concrete.
This standard was proposed by the China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
Drafting organizations of this standard. China Metallurgical Construction
Research Institute Co., Ltd., Changshu Longteng Rolling Element
Manufacturing Co., Ltd., Liaoning Tongda Building Material Industry Co., Ltd.,
Tianjin Yinlong Prestressed Material Co., Ltd., Tianjin Metallurgical Group
Zhongxing Shengda Steel Co., Ltd., Beijing Tieke Shougang Rail Technology
Co., Ltd., Huludao North Metal Products Co., Ltd., Tianjin Iron and Steel Group
Co., Ltd., Metallurgical Industry Information Standards Research Institute.
The main drafters of this standard. Zhu Jianguo, Zhang Ying, Ren Cuiying,
Zhao Hui, Xu Sheng, Li Weiwei, Xie Zhian, Lin Xiuyan, Wang Shuyi, Lu Yuheng,
Xu Qian, Li Xiaoliang, Tao Ran, Wang Lingjun, Xu Li, Zhou Ning, Yan Chongjian,
Wang Wenxi, Zhao Haifeng, Liu Shiwang, Wu Jianguo, Yang Guiyu, Leng
Mingjian.
This standard replaces the standard previously issued as follows.
- GB/T 21839-2008.
Test methods of steel for prestressing concrete
1 Scope
This standard specifies the test methods for the tensile, bending, repeated
bending, torsion, winding and coating adhesion, isothermal relaxation, axial
force fatigue, stress corrosion in thiocyanate solution, deflection tensile,
chemical analysis, measurement of geometric dimensions, determination of
relative rib area, determination of nominal mass deviation per meter, detection
of anti-corrosion grease content, measurement of sheath thickness, coating
uniformity, zinc layer quality and so on, of the steel for prestressing concrete.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at
room temperature (GB/T 228.1-2010, ISO 6892-1.2009, MOD)
3 Symbols and description
The symbols and descriptions given in Table 1 apply to this document.
4 General requirements for specimen
Unless otherwise specified in other agreements or product standards,
specimens are generally taken from the finished product before packaging.
When the sample is a packaged product (such as rolls or bundles), the
interception of the specimen shall prevent the specimen from changing its
properties due to plastic deformation.
5 Tensile test
The test equipment shall be checked and calibrated according to GB/T 16825.1.
It shall have at least level 1 accuracy.
In addition to the requirements specified in 5.3.1, when determining the elastic
modulus, the stress rate shall remain unchanged within the force range.
6 Bending test
The determination of the results of the bending test shall meet the requirements
of the relevant product standards.
When the product standard does not specify, if there are no visible cracks in the
bent part, the specimen is judged to be qualified.
7 Repeated bending test
The repeated bending test shall be carried out according to the requirements of
GB/T 238.
8 Torsion test
Torsion test shall be carried out in accordance with GB/T 239.1.
The torsion rate used is not more than 30 r/min.
The axial tension used is 0.5% ~ 2% of the corresponding tensile load of
the nominal tensile strength of the specimen.
9 Winding and coating adhesion test
The test equipment shall comply with the relevant requirements in GB/T 2976.
The winding and coating adhesion test shall be carried out in accordance with
the requirements of GB/T 2976.
10 Isothermal relaxation test
The isothermal stress relaxation test is to keep the specimen at a certain length
(L0 + ΔL0) at a given temperature (unless otherwise specified, usually 20 °C);
starting from the initial force F0, measure the change of the force on the
specimen (see Figure 3).
11 Axial force fatigue test
The fatigue testing machine shall be calibrated regularly; the accuracy level
shall be at least ±1%; the testing machine shall be able to maintain the load
(Fup) error range within ±2% of the specified value; the force range (Fr) shall be
maintained within ±4% of the specified value.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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