GB/T 50081-2019 PDF English
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Standard for test methods of concrete physical and mechanical properties
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| GB/T 50081-2002 | English | RFQ |
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[Replaced by GB/T 50081-2019] Standard for test method of mechanical properties on ordinary concrete
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GB/T 50081-2019: Standard for test methods of concrete physical and mechanical properties---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/GBT50081-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB/T 50081-2019
Standard for test methods of concrete physical and
mechanical properties
Issued on. JUNE 19, 2019
Implemented on. DECEMBER 01, 2019
Issued by. Ministry of Housing and Urban-Rural Development of the PRC;
State Administration for Market Regulation.
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Standard for test methods of concrete physical and
mechanical properties
Main drafting organization. Ministry of Housing and Urban-Rural Development
of the PRC
Approval organization. Ministry of Housing and Urban-Rural Development of
the PRC
Date of implementation. December 1, 2019
2019 Beijing
Announcement of Ministry of Housing and Urban-
Rural Development of the PRC
2019, No.174
Table of Contents
Foreword... 6
1 General... 9
2 Terms and symbols... 9
2.1 Terms... 9
2.2 Symbols... 11
3 Basic requirements... 12
3.1 General requirements... 12
3.2 Section size of specimen... 12
3.3 Dimensional measurement and tolerance of specimen... 13
3.4 Test report... 14
4 Preparation and curing of specimen... 15
4.1 Instrument equipment... 15
4.2 Sampling and preparation of specimen... 16
4.3 Preparation of specimen... 16
4.4 Curing of specimen... 19
5 Test of compressive strength... 20
6 Test of axial compressive strength... 23
7 Test of elastic modulus under static compressive stress... 25
8 Test of Poisson's ratio... 29
9 Test of splitting tensile strength... 33
10 Test of flexural tensile strength... 36
11 Test of axial tensile... 39
12 Test of the bond strength between concrete and steel bars... 45
13 Test of concrete bond strength... 49
14 Test of abrasion resistance... 51
14.1 Test of abrasion loss... 51
14.2 Test of grinding pit length... 54
15 Test of thermal diffusivity... 58
16 Test of thermal conductivity... 62
17 Test of specific heat capacity... 66
18 Test of linear expansion coefficient... 69
19 Test of density of hardened concrete... 72
20 Test of water absorption... 77
Appendix A Style sheet of test report... 81
Appendix B Preparation and curing of cylinder specimen... 90
Appendix C Test of compressive strength of cylinder specimen... 93
Appendix D Elastic modulus under static compressive stress test of cylinder
specimen... 95
Appendix E Splitting tensile strength test of cylinder specimen... 99
Appendix F Table of relation between θ/θ0 value and αt/D2 value... 102
Explanation of wording in this standard... 108
List of quoted standards... 109
1 General
1.0.1 In order to standardize and unify the test methods of concrete physical
and mechanical properties, to improve the level of concrete test technology, this
standard is hereby formulated.
1.0.2 This standard is applicable to the test of physical and mechanical
properties of concrete in construction projects. This standard does not apply to
fully graded concrete and roller-compacted concrete in water conservancy and
hydropower projects.
1.0.3 In addition to the provisions of this standard, the test methods of concrete
physical and mechanical properties shall also comply with the provisions of the
current relevant national standards.
2 Terms and symbols
2.1 Terms
2.1.1 Concrete
The engineering materials, which are produced through such processes as
blending, forming, curing, AND have strength after hardening, through the use
of cement, aggregate, water as the main raw materials, by adding mineral
admixtures and additives as required, according to a certain ratio.
2.1.2 Compressive strength
The maximum pressure, that the cube specimen can withstand per unit area.
2.1.3 Axial compressive strength
The maximum pressure, that the prism specimen can withstand per unit area,
in the axial direction.
2.1.4 Elastic modulus under static compressive stress
The stress required for producing unit deformation, when a prism specimen or
a cylinder specimen is subjected to a certain pressure, in the axial direction.
2.1.5 Poisson's ratio
The ratio of the absolute value of the transverse normal strain TO the axial
normal strain, when a concrete specimen is axially compressed.
2.1.6 Splitting tensile strength
An approximately uniformly distributed ultimate tensile stress, which is
generated in the vertical plane where the pressure acts, when the middle of the
upper and lower surfaces of a cube specimen or a cylinder specimen is subject
to splitting failure, under uniformly distributed pressure.
2.2 Symbols
α - Concrete thermal diffusivity;
c - The specific heat capacity of concrete;
Ec - The elastic modulus of concrete under static compressive stress;
Et - The elastic modulus of concrete under tensile stress;
fcc - The compressive strength of concrete cube specimen;
fcp - The axial compressive strength of concrete;
fts - The splitting tensile strength of concrete;
ff - The flexural tensile strength of concrete;
ft - The axial tensile strength of concrete;
fb - The bond strength of concrete;
3 Basic requirements
3.1 General requirements
3.1.1 The relative humidity of the test environment should not be less than 50%.
The temperature shall be kept at 20 °C ± 5 °C.
3.1.2 The test instrument and equipment shall have a metrological verification
or calibration certificate within the validity period.
3.2 Section size of specimen
3.2.1 The minimum cross-sectional size of the specimen shall be selected from
Table 3.2.1, according to the maximum particle size of the aggregate in the
concrete.
3.2.2 The specimens shall be prepared by the specimen mold, which complies
with the provisions of Article 4.1.1 of this standard. Meanwhile it shall guarantee
that the dimensions of the specimens meet the requirements.
3.3 Dimensional measurement and tolerance of specimen
3.3.2 The dimensional tolerances of side length, diameter, height of the
specimen shall not exceed 1 mm.
4 Preparation and curing of specimen
4.1 Instrument equipment
4.1.1 The specimen mold shall meet the following requirements.
4.1.2 The vibrating table shall comply with the relevant requirements of the
current industry standard "Vibrating table for concrete test" JG/T 245.The
vibration frequency shall be 50 Hz ± 2 Hz. When there is no load, the vertical
amplitude of the center point of the vibrating table shall be 0.5 mm ± 0.02 mm.
4.1.3 The tamping rod shall comply with the relevant requirements of the current
industry standard "Apparatus for concrete slump test" JG/T 248.The diameter
shall be 16 mm ± 0.2 mm. The length shall be 600 mm ± 5 mm. The end shall
be hemispherical.
4.2 Sampling and preparation of specimen
4.2.1 For the concrete sampling and specimen preparation, it shall comply with
the relevant provisions of the current national standard "Standard for test
method of performance on ordinary fresh concrete" GB/T 50080.
4.2.2 The mixture used for each set of specimens shall be sampled from the
same pan of concrete OR the same truck of concrete.
4.3 Preparation of specimen
4.3.1 Before the specimen is formed, the size of the specimen mold shall be
checked, which shall comply with the relevant provisions in article 4.1.1 of this
standard. The specimen mold shall be wiped clean; a thin layer of mineral oil
OR release agent, which does not react with concrete, shall be evenly painted
on the inner wall. The release agent on the inner wall of the specimen mold
shall be evenly distributed; there shall be no obvious deposits.
4.3.2 The homogeneity of the concrete mixture shall be ensured, before it is
pouring into mold.
4.3.3 It should determine the appropriate forming method, according to the
consistency of the concrete mixture or the purpose of the test. The concrete
shall be sufficiently dense, to avoid delamination and segregation.
4.4 Curing of specimen
4.4.1 The standard curing of the specimen shall meet the following
requirements.
4.4.2 The mold removal time of structural solid concrete specimens, which are
cured under the same conditions, can be the same as the mold removal time of
actual components. The structural solid concrete specimens, which are cured
under the same conditions, shall be in accordance with the current national
standard "Code for acceptance of constructional quality of concrete structures"
GB 50204.
5 Test of compressive strength
5.0.1 This method is suitable for determining the compressive strength of
concrete cube specimens. The test of compressive strength of the cylinder
specimen shall be carried out in accordance with Appendix C of this standard.
5.0.2 For the specimens, which are used for the test to determine the
compressive strength of concrete cubes, the size and quantity shall meet the
following requirements.
5.0.4 The test of compressive strength of cube specimen shall be carried out
according to the following steps.
6 Test of axial compressive strength
6.0.1 For the specimens, which are used for the test to determine the axial
compressive strength of concrete, the size and quantity shall meet the following
requirements.
6.0.4 The calculation and determination of test results shall be carried out
according to the following methods.
7 Test of elastic modulus under static compressive stress
7.0.1 For determination of the elastic modulus under static compressive stress
of concrete of the prism specimen, it shall comply with the provisions of this
chapter. For the test of elastic modulus under static compressive stress of the
cylinder specimen, it shall be carried out in accordance with Appendix D of this
standard.
7.0.2 The test specimens, which are used for the test for determining the elastic
modulus of concrete, the size and quantity shall meet the following
requirements.
7.0.3 The test instrument and equipment shall meet the following requirements.
7.0.5 For the test results of the elastic modulus of concrete under static
pressure, the calculation and determination shall be carried out according to
the following methods.
8 Test of Poisson's ratio
8.0.1 For the specimens, which are used for the test of Poisson's ratio of
concrete, the size and quantity shall meet the following requirements.
8.0.2 The test instrument and equipment shall meet the following requirements.
8.0.3 The test of Poisson's ratio shall be carried out according to the following
steps.
9 Test of splitting tensile strength
9.0.1 This method is suitable for measuring the splitting tensile strength of
concrete cube specimens. The test method for splitting tensile strength of
cylinders shall be carried out in accordance with Appendix E of this standard.
9.0.2 For the specimens, which are used for the test of determining the splitting
tensile strength of concrete, the size and number shall meet the following
requirements.
9.0.3 The test equipment shall meet the following requirements.
9.0.4 The test of splitting tensile strength shall be carried out according to the
following steps.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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