This standard is applicable to the mechanical properties test of ordinary concrete in industrial and civil buildings and general structures, including compressive strength test, axial compressive strength test, static compressive elastic modulus test, splitting tensile strength test and flexural strength test. GB/T 50081-2002 Standard for test methods of mechanical properties of ordinary concrete GB/T50081-2002 Standard download decompression password: www.bzxz.net

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National Standard of the People's Republic of China
GB/T50081—2002
Mechanical properties of ordinary concrete
Test method standard
Standard for test method of mechanical propertieson ordinary concrete
2003—0110
2003—06—01
Ministry of Construction of the People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
Engineering Construction Standards Full-text Information System
Jointly issued
Engineering Construction Standards Full-text Information System
National Standard of the People's Republic of China
Mechanical properties of ordinary concrete
Test method standard
Standard for test method of mechanical propertieson ordinary concrete
GB/T50081—2002
Approving department: Ministry of Construction of the People's Republic of China Effective date: June 1, 2003
3Beijing
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Ministry of Construction of the People's Republic of China
No. 102
Announcement of the Ministry of Construction on the Issuance of the National Standard
Standard for Test Methods of Mechanical Properties of Ordinary Concrete The Standard for Test Methods of Mechanical Properties of Ordinary Concrete is hereby approved as a national standard, numbered GB/T50081-2002, and will be implemented from June 1, 2003. The original Standard for Test Methods of Mechanical Properties of Ordinary Concrete GBJ81-85 will be abolished at the same time. This standard is published and distributed by the Standard and Quota Research Institute of the Ministry of Construction and China Building Industry Press.
Ministry of Construction of the People's Republic of China
January 10, 2003
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
In accordance with the requirements of the Ministry of Construction's Construction Standards [1998] No. 94 "Notice on the 1998 National Standard Formulation and Revision Plan for Engineering Construction", the standards group revised the original national standard "Test Methods for Mechanical Properties of Ordinary Concrete" (GBJ81-85) on the basis of extensive research, careful summary of practical experience, reference to advanced foreign standards, and extensive solicitation of opinions.
The main technical contents of this standard are: 1 General; 2 Sampling; 3 Size, shape and tolerance of test specimens; 4 Test equipment; 5 Preparation and maintenance of test specimens; 6 Compressive strength test; 7 Axial compressive strength test; 8 Static compressive elastic modulus test; 9 Splitting tensile strength test: 10 Flexural strength test: Appendix A Preparation and maintenance of cylindrical specimens, Appendix B Compressive strength test of cylindrical specimens, Appendix C Static compressive elastic modulus test of cylindrical specimens, Appendix D Splitting tensile strength test of cylindrical specimens; Explanation of words and terms used in this standard.
The main contents of the revision are: 1. In order to align with international standards, the preparation of cylindrical specimens and the test methods of their various mechanical properties are added to the appendix of the new standard; 2. Higher requirements are put forward for the temperature and humidity of the standard curing room in the original standard, from the original temperature of 20 ± 3 ° C and humidity of more than 90% to the temperature of 20 ± 2 ° C and humidity of more than 95% in accordance with the IS0 test method; 3. After a series of tests, the test of the elastic modulus of concrete under static compression is equivalent to the ISO standard test method. 4. For the mechanical properties of high-strength concrete with a concrete strength grade of not less than C60, a more scientific and reasonable test method is proposed; 5. Standardization requirements are put forward for test instruments and equipment, and some measurement units are corrected in physical concepts; 6. The content that the test report should include is proposed, etc. The main editor of this standard: China Academy of Building Research (Address: No. 30, North Third Ring Road East, Beijing, Postal Code 100013, E-mail: igbzcabr@vip, sina.com) Participating organizations of this standard: Tsinghua University
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
School of Materials Science and Engineering, Tongji University
Hunan University
Product Quality Supervision and Inspection Center of Ministry of Railways
Guiyang China Construction Architectural Science Design Institute
China Building Materials Science Research Institute
Hangzhou Institute of Applied Engineering
Shanghai Academy of Building Research
Jinan Shijin Group Co., Ltd.
The main drafters of this standard: Rong Junming, Lu Jianwen, Yao Yan, Yang Jing, Li Qiling, Huang Zhengyu, Zhong Meiqin, Lin Lixun, Li Jiakang, Gu Zhengmin, Tao Liying 3
Engineering Construction Standards Full-text Information System
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2 Sampling
3 Size, shape and tolerance of test piece
3.1 Size of test piece
Shape of test piece
Dimension tolerance||tt ||Vibration tableWww.bzxZ.net
Pressure testing machine
Micro deformation measuring instrument
Blocks, pads and brackets
Steel pads
Other measuring tools and instruments
5 Preparation and maintenance of test pieces
Preparation of test pieces
5.2 Maintenance of test pieces
5.3 Test records.·
Compressive strength test·
Axial compressive strength test
Static compressive elastic modulus Test
Split tensile strength test
10 Flexural strength test
Appendix A Preparation and maintenance of cylindrical specimens
Appendix B
Compressive strength test of cylindrical specimens
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Engineering construction standard full-text information system
Appendix C Static compression elastic modulus test of cylindrical specimens Appendix D
Split tensile strength test of cylindrical specimens|| tt||Explanation of words and terms used in this standard
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1.0.1 This standard is formulated to further standardize concrete test methods, improve concrete test accuracy and test level, and have a unified concrete mechanical properties test method when inspecting or controlling the quality of concrete engineering or precast concrete components. 1.0.2 This standard is applicable to ordinary concrete mechanical properties tests in industrial and civil buildings and general structures, including compressive strength tests, axial compressive strength tests, static compressive elastic modulus tests, splitting tensile strength tests, and flexural strength tests. 1.0.3 For tests conducted according to the test methods of this standard, the test report or test record shall generally include the following contents:
1 Contents provided by the entrusting unit:
1) Name of the entrusting unit;
2) Name of the project and construction location;
3) Name of the project to be tested;
4) Other contents to be explained.
2 Contents provided by the test piece production unit:
1) Test piece number;
2) Test piece production date;
3) Concrete strength grade;
4) Test piece shape and size;
5) Type, specification and origin of raw materials and concrete mix ratio; 6) Curing conditions;
7) Test age;
8) Other contents to be explained.
3 Contents provided by the testing unit:
1) Date of receipt of the test piece;
2) Shape and size of the test piece;
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3) Test number;
4) Test date;
5) Name, model and number of instruments and equipment; 6) Test room temperature;
7) Curing conditions and test age;
8) Concrete strength grade;
9) Test results;
10) Other contents to be explained.
In addition to complying with the provisions of this standard, the test method for mechanical properties of ordinary concrete shall also be implemented in accordance with the requirements of relevant provisions in the current national mandatory standards. 2
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Engineering Construction Standard Full Text Information System
2.0.1 Concrete sampling shall comply with the relevant provisions of Chapter 2 of the Standard for Test Methods for Properties of Ordinary Concrete Mixtures (GB/T50080). 2.0.2 The mechanical property test of ordinary concrete shall be conducted on three specimens as a group. The mixture used in each group of specimens shall be sampled from the same batch of concrete or the same truckload of concrete. 3
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3 Dimensions, shapes and tolerances of specimens
3.1 Dimensions of specimens
3.1.1 The dimensions of the specimens shall be selected according to the maximum particle size of the aggregate in the concrete in accordance with Table 3.1.1.
Specimen cross-sectional dimensions (mm)
Concrete specimen dimension selection table
Maximum aggregate particle size (mm)
Split tensile strength test
100×100
150×150
200×200
Other tests
Note: The maximum aggregate particle size refers to the aperture of the round hole sieve specified in the "Quality Standard and Test Method for Crushed Stone or Pebbles for Ordinary Concrete" (JGJ53-92). 3.1.2
To ensure the size of the specimen, the specimen shall be made using a test mold that complies with the provisions of Section 4.1 of this standard.
3.2 Specimen shape
3.2.1 Compressive strength and split tensile strength specimens shall comply with the following provisions: 1 The cubic specimen with a side length of 150 mm is the standard specimen. 2 Cube specimens with side lengths of 100mm and 200mm are non-standard specimens. 3 In special cases, standard cylindrical specimens of 150mm×300mm or non-standard cylindrical specimens of 100mm×200mm and 200mm×400mm may be used.
3.2.2 The specimens for axial compressive strength and static compressive elastic modulus shall comply with the following provisions:
1 Prismatic specimens with side lengths of 150mmX150mm×300mm are standard 4
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Specimens.
Prismatic specimens with side lengths of 100mm×100mm×300mm and 200mm×200mmX400mm are non-standard specimens. 3 In special cases, standard cylindrical specimens of 150mm×300mm or non-standard cylindrical specimens of 100mm×200mm and 200mm×400mm may be used.
3.2.3 Flexural strength specimens shall comply with the following provisions: 1 Prismatic specimens with a side length of 150mm×150mmX600mm (or 550mm) are standard specimens.
2 Prismatic specimens with a side length of 100mm×100mm×400mm are non-standard specimens.
3.3 Dimensional tolerances
3.3.1 The flatness tolerance of the pressure-bearing surface of the specimen shall not exceed 0.0005d (d is the side length).
The angle between adjacent faces of the specimen shall be 90°, and its tolerance shall not exceed 0.5°. 3.3.2
3.3.3 The tolerance of the length, diameter and height of each side of the test piece shall not exceed 1mm.
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