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GB/T 1927.8-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 8: Determination of swelling
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Test methods for physical and mechanical properties of small clear wood specimens - Part 8: Determination of swelling
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GB/T 1927.8-2021
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Basic data | Standard ID | GB/T 1927.8-2021 (GB/T1927.8-2021) | | Description (Translated English) | Test methods for physical and mechanical properties of small clear wood specimens - Part 8: Determination of swelling | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B68 | | Word Count Estimation | 9,981 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 1927.8-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 8: Determination of swelling
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Test methods for physical and mechanical properties of small clear wood specimens -- Part 8: Determination of swelling
ICS 79:040
CCSB68
National Standards of People's Republic of China
Replacing GB/T 1934:2-2009
Test method for physical and mechanical properties of wood with small sample without defect
Part 8: Determination of swelling properties
(ISO 13061-15:2017, Physical and mechanical properties of wood-
ISO 13061-16:2017, Physical and mechanical properties of wood-
Testmethodsforsmalclearwoodspecimens-
Part 16:Determinationofvolumetricsweling,MOD)
2021-12-31 Released 2022-07-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents"
drafted:
This document is part 8 of GB/T 1927 "Test Methods for Physical and Mechanical Properties of Small Specimens of Wood without Defects": GB/T 1927 has been issued
The following parts are distributed:
--- Part 1: Collection of test materials;
--- Part 2: Sampling methods and general requirements;
--- Part 3: Determination of growth ring width and latewood rate;
--- Part 4: Determination of moisture content;
--- Part 5: Density determination;
--- Part 6: Determination of dry shrinkage;
--- Part 7: Determination of water absorption;
--- Part 8: Determination of swelling properties;
--- Part 9: Determination of flexural strength;
--- Part 10: Determination of flexural modulus of elasticity;
--- Part 12: Determination of transverse grain compressive strength;
--- Part 17: Determination of impact toughness;
--- Part 18: Determination of impact indentation;
--- Part 19: Determination of hardness;
--- Part 20: Determination of splitting resistance:
This document replaces GB/T 1934:2-2009 "Wood Swelling Determination Method": Compared with GB/T 1934:2-2009, the main technical
The changes are as follows:
a) the chapter "Terms and Definitions" was added (Chapter 3);
b) Changed the principle (see Chapter 4, Chapter 3 of the:2009 edition);
c) Changed the provisions on the size of the sample (see 6:1, 5:2 of the:2009 edition);
d) Added "Sample growth wheel tilt limit" (see 6:3);
e) Added "measurement point mark" (see 6:4);
f) Changed the criterion for reaching the air-dry state (see 7:1:2, 6:2 of the:2009 edition);
g) Changed the criterion for reaching the saturated state (see 7:1:3, 6:3 of the:2009 edition);
h) Changed the "result calculation formula" (see Chapter 7 of 8:2,:2009 edition);
i) Changed the requirements for the preparation of test report content (see 9:2, 8:2 of the:2009 edition);
j) Appendix A is changed to "Informative":
This document is modified to adopt ISO 13061-15:2017 "Test methods for the physical and mechanical properties of wood with small defect-free specimens - Part 15: Radial
Determination of Chordal Swelling" and ISO 13061-16:2017 "Test methods for small unblemished specimens for physical and mechanical properties of wood - Part 16: Volume
Swelling Determination":
This document has the following structural adjustments compared to ISO 13061-15:2017 and ISO 13061-16:2017:
a) Chapter 5 corresponds to Chapter 5 of ISO 13061-15 and 5:1 of ISO 13061-16;
b) Chapter 6 corresponds to Chapter 6 of ISO 13061-15 and 5:2 of ISO 13061-16;
c) 7:1 corresponds to Chapter 7 of ISO 13061-15;
d) 7:2 corresponds to Chapter 8 of ISO 13061-15;
e) 8:1 corresponds to 5:3 of ISO 13061-16;
f) 8:1 corresponds to 5:4 of ISO 13061-16;
g) Clause 9 corresponds to Clause 9 of ISO 13061-15 and Clause 7 of ISO 13061-16:
The technical differences between this document and ISO 13061-15:2017 and ISO 13061-16:2017 and the main reasons are as follows:
a) changed the source of terminology (see Chapter 3) to ensure professionalism and uniformity of terminology;
b) Modified the drying step in the fully dry state (see 7:1:1) to improve scientificity;
c) This document adds the provisions for the radial, chordwise and volumetric swellability of the specimen from the fully dry state to the air-dry state, because I
The historical version of the national standard has this test method, which has application value;
d) The drainage method in Chapter 6 of ISO 13061-16 is deleted, because the specific measurement method is not specified in the ISO standard:
The following editorial changes have been made to this document:
a) In order to harmonize with the existing standards, the name of the standard is changed to "Test methods for the physical and mechanical properties of wood with small samples without defects - Part 8: Wet
Expansion Determination";
b) Added Appendix A (informative):
Please note that some content of this document may involve patents, and the issuing authority of this document does not assume responsibility for identifying patents:
This document is proposed by the State Forestry and Grassland Administration:
This document is under the jurisdiction of the National Timber Standardization Technical Committee (SAC/TC41):
This document is drafted by: Wood Industry Research Institute, Chinese Academy of Forestry, Jiusheng Flooring Co:, Ltd:, Suzhou David Wood Co:, Ltd:
Company, Xiamen Minghongtang Arts & Crafts Co:, Ltd:, Sichuan Agricultural University:
The main drafters of this document: Huang Rongfeng, Zhao Youke, Zhao Rongjun, Sun Longxiang, An Xin, Jiang Jiali, Wang Yanwei, Yu Huaqiang, Yu Lichun, Huang Can,
Xiang Erin, Li Jing, Qi Jinqiu:
The previous versions of this document and its superseded documents are as follows:
--- First published in 1980 as GB/T 1934:2-1980, first revised in:1991, second revised in:2009;
--- This is the third revision, adjusted to Part 8 of GB/T 1927:
Introduction
The standard of test methods for physical and mechanical properties of wood is used in wood scientific research, teaching, wood inspection, wood structure design, wood processing and production, etc:
It is widely used and is an important basic standard in the wood industry: In 1980, my country issued the first edition of the test methods for physical and mechanical properties of wood:
The domestic standard (GB/T 1927~GB/T 1943) was revised twice in:1991 and:2009 respectively: In recent years, with the development of wood science and technology
The development of technology, ISO 3129:2012 "Sampling methods for wood physical and mechanical tests of small samples of wood without defects and
"General Requirements" has been revised, ISO 3130:1975 "Determination of moisture content by physical and mechanical tests of wood", ISO 3131:1975 "Wood
15 international standards for test methods such as "Determination of Density in Physical and Mechanical Tests" have been integrated and revised: Based on this, in order to be in line with international standards, this time
The third revision was made to the national standard for test methods for physical and mechanical properties of wood in my country, and the 22 scattered test methods were integrated and adjusted to
The sub-part document of GB/T 1927 adopts the latest version of the international standard in the revision:
GB/T 1927 aims to establish a test method for the physical and mechanical properties of small sample wood without flaws, and is intended to be composed of 21 parts:
--- Part 1: Collection of test materials: The purpose is to describe the sample collection method for testing the physical and mechanical properties of wood with small samples without defects:
--- Part 2: Sampling methods and general requirements: The purpose is to establish a suitable test for the physical and mechanical properties of small wood samples without defects:
Specimen sawing, interception methods and general requirements to be observed when testing methods:
--- Part 3: Determination of growth ring width and latewood rate: The purpose is to characterize the growth ring width and latewood rate of small samples of clear wood
method of measurement:
--- Part 4: Determination of moisture content: The purpose is to describe the method for the determination of moisture content of small wood samples without defects:
--- Part 5: Density determination: The purpose is to describe the density, air-dry density, absolute dry
Methods for the determination of density and basic density:
--- Part 6: Determination of dry shrinkage: The purpose is to describe the measurement of radial, chordwise and volume drying shrinkage of unblemished small sample wood:
determined method:
--- Part 7: Determination of water absorption: The purpose is to describe the determination method of 6h, 24h and the maximum water absorption rate of small sample wood without defect:
--- Part 8: Determination of swelling: The purpose is to describe the measurement of radial, chordwise and volumetric swell of unblemished small wood samples:
determined method:
--- Part 9: Determination of flexural strength: The purpose is to describe a method for the determination of the flexural strength of small wood samples without defects:
--- Part 10: Determination of flexural modulus of elasticity: The purpose is to describe a method for the determination of the flexural modulus of elasticity of small wood samples without defects:
--- Part 11: Determination of compressive strength along grain: The purpose is to describe a method for the determination of the compressive strength along the grain of small wood samples without defects:
--- Part 12: Determination of transverse grain compressive strength: The purpose is to describe the transverse grain compressive proportional ultimate strength of small unblemished wood samples, including
Methods for the determination of the total compressive proportional ultimate strength of the horizontal grain and the partial compressive proportional ultimate strength of the horizontal grain:
--- Part 13: Determination of compressive elastic modulus of transverse grains: The purpose is to describe the measurement of the transverse-grain compressive elastic modulus of unblemished small samples of wood:
determined method:
--- Part 14: Determination of tensile strength along grain: The purpose is to describe a method for the determination of the along-grain tensile strength of unblemished small samples of wood:
--- Part 15: Determination of transverse grain tensile strength: The purpose is to describe a method for the determination of the transverse grain tensile strength of small wood samples without defects:
--- Part 16: Determination of shear strength along grain: The purpose is to describe a method for the determination of the shear strength along the grain of small wood samples without defects:
--- Part 17: Determination of impact toughness: The purpose is to describe a method for the determination of the chordwise impact toughness of small unblemished wood samples:
--- Part 18: Determination of impact indentation: The purpose is to describe a method for the determination of the impact indentation resistance of unblemished small samples of wood:
--- Part 19: Determination of hardness: The purpose is to describe a method for the determination of radial, chord, and longitudinal hardness of small, unblemished wood samples:
--- Part 20: Determination of splitting resistance: The purpose is to describe the method for the determination of the splitting resistance on the radial and chord surfaces of small wood samples without defects:
--- Part 21: Determination of nail holding force: The purpose is to describe a method for the determination of the nail-holding force of small samples of wood without defects:
Test method for physical and mechanical properties of wood with small sample without defect
Part 8: Determination of swelling properties
1 Scope
This document describes the principles, test equipment, sample preparation, testing methods for the determination of radial, chordwise, and volumetric swells of unblemished small specimens of wood:
Test steps, result calculation and test records, etc:
This document is applicable to the radial, chordwise swelling and volume of wood from dry to air-dry state and from dry to water-saturated state of unblemished small samples
Determination of swellability:
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations
documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to
this document:
GB/T 1927:2-2021 Test methods for physical and mechanical properties of wood with small unblemished samples - Part 2: Sampling methods and general requirements
(ISO 3129:2019, MOD)
GB/T 1927:4-2021 Test methods for physical and mechanical properties of wood with small samples without defects - Part 4: Determination of moisture content
(ISO 13061-1:2014, MOD)
LY/T 1788 Timber Properties Terms
3 Terms and Definitions
Terms and definitions defined in LY/T 1788 apply to this document:
4 Principles
4:1 Radial and chordwise swelling properties
Measure the radial and chord dimensions of wood in fully dry, air-dried, and water-saturated conditions: Take the sample from fully dry to air dry time
The ratio of the dimensional change in the radial or chord direction to the size in the fully dry state, indicating the air-dry swelling ratio of the sample in the radial or chord direction;
The ratio of the radial or chordwise dimensional change in water to its size in the fully dry state, indicating the water-saturated swelling ratio of the specimen in the radial or chordwise direction: Initial measurement
It should be carried out in a completely dry state, and the final measurement should be carried out in a saturated state:
4:2 Volume swelling
This document specifies the method for measuring the volume of wood, that is, the volume is calculated as the product of the radial, chord, and along-grain dimensions of the specimen: measuring wood
The volume of the wood in the fully dry state, in the air-dry state, and in the saturated state: The volume change of the sample from the completely dry state to the air-dry state is related to the total
The ratio of the volume in the dry state represents the air-dry swell rate of the sample volume; the volume change of the sample from the fully dry state to the saturated state is compared with the fully dry state:
The ratio of the lower volume represents the water-saturated swelling ratio of the sample volume: The initial measurement should be carried out in a completely dry state, and the final measurement should be carried out in a saturated state
conduct:
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