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LY/T 3194-2020: Structural bamboo scrimber
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LY/T 3194-2020
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Basic data | Standard ID | LY/T 3194-2020 (LY/T3194-2020) | | Description (Translated English) | Structural bamboo scrimber | | Sector / Industry | Forestry Industry Standard (Recommended) | | Classification of Chinese Standard | B70 | | Classification of International Standard | 79.020 | | Word Count Estimation | 22,227 | | Date of Issue | 2020-03-30 | | Date of Implementation | 2020-10-01 | | Regulation (derived from) | Announcement No. 6 of 2020 by the State Forestry and Grassland Bureau | | Issuing agency(ies) | State Forestry and Grassland Administration | LY/T 3194-2020: Structural bamboo scrimber---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Structural bamboo scrimber
2020-10-01 Implementation
ICS 79.020
B 70
Restructuring bamboo
20-03-30 release
Issued by the State Forestry and Grassland Administration
People's Republic of China Forestry Industry Standard
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed and managed by the National Bamboo and Rattan Standardization Technical Committee (SAC/TC 263).
Drafting organizations of this standard. Research Institute of Wood Industry, Chinese Academy of Forestry, International Center for Bamboo and Rattan, Fujian Jixing Bamboo Industry Co., Ltd.,
Fujian Jinzhu Bamboo Industry Co., Ltd., Guangdong Academy of Forestry Sciences, International Organization of Bamboo and Rattan, Hangzhou Runzhu Technology Co., Ltd., Hongya Zhuyuan Branch
Technology Co., Ltd., Hunan Taohuajiang Bamboo Technology Co., Ltd., Nanjing Forestry University, Qingdao Guosen Machinery Co., Ltd., Shaoxing Zhonghe Bamboo
Wood Products Co., Ltd., Sichuan University, Tyre Adhesive (Guangdong) Co., Ltd., Xuancheng Hongyu Bamboo Industry Co., Ltd. (According to the pinyin of the first letter of the company
Alphabetical order)
The main drafters of this standard. Yu Wenji, Yu Yanglun, Zhong Yong, Zhu Rongxian, Wang Ge, Ren Dinghua, Ren Haiqing, Deng Kan, Zhang Xinpei,
Liu Kewei, Liu Xianmiao, Li Haitao, Jiang Yongjian, Ren Xiang, Wang Zhong, Zhou Chungui, Xue Zhicheng, Li Xiaoxian, Li Shenglong, Xin Xianjun, Zhang Ya
Hui, Zhang Yamei, Qi Yue, Huang Yuxiang, Ma Hongxia.
Restructuring bamboo
1 Scope
This standard specifies the terms and definitions, classification, technical requirements, test methods, and determination of mechanical properties
Determine methods, inspection rules, marking, packaging, and transportation.
This standard applies to the production of restructured bamboo of engineering structure.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies
In this document. For undated references, the latest version (including all amendments) applies to this document.
GB/T 1928 General Rules for Wood Physical and Mechanical Test Methods
GB/T 2828.1-2012 Sampling inspection procedures by attributes Part 1.Batch inspection sampling for acceptance quality limit (AQL) retrieval
Plan (ISO 2859-1.1999, IDT)
GB/T 8625 Test method for flame resistance of building materials
GB/T 9978 Fire test method for building components
GB/T 13942.1 Laboratory test method for natural corrosion resistance of wood
GB/T 18260 Laboratory test method for the toxicity of wood preservatives to termites
GB 18580-2017 The limit of formaldehyde emission in wood-based panels and products of interior decoration materials
GB/T 30364 Restructuring bamboo flooring
LY/T 2381-2014 Basic requirements for wooden materials used in structures
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Reorganized bamboo bamboo scrimber
The bamboo bundles are assembled and glued along the pattern of the board and square timber.
3.2
Hot-pressing bamboo scrimber
The bamboo bundle is a board formed by hot pressing and gluing along the pattern.
3.3
Cold molding and hot curing bamboo scrimber
The bamboo bundle is a square lumber formed by forming a blank along the grain, forming by cold pressing and then heating and solidifying.
3.4
Reconstituted bamboo that meets the structural requirements of the production engineering.
3.5
Thickness direction
The direction parallel to the pressure when the reconstituted bamboo is cold-pressed or hot-pressed.
3.6
Width direction
The direction perpendicular to the pressure when the reconstituted bamboo is cold-pressed or hot-pressed.
3.7
Thick Surfaces
The longitudinal section along the thickness of the reconstituted bamboo.
3.8
Width Surfaces
The longitudinal section along the width of the reconstituted bamboo.
3.9
Blister blow; blister
Due to the failure of the gluing, there is a defect in the reorganized bamboo with cavities and local protrusions on the surface.
3.10
Broken thorn
Reorganize the bamboo filament protrusions on the bamboo surface.
3.11
Delamination
Recombinant bamboo is a phenomenon in which the glued surface is separated due to poor glueing.
3.12
Decay
Recombinant bamboo cell walls are decomposed by decay fungi or other microorganisms to rot and disintegrate the bamboo tissue structure, including white rot,
Brown rot and soft rot etc.
3.13
Mildew
The material and color of the restructured bamboo change due to the growth of mold and discoloration bacteria
4 categories
4.2 According to the use environment.
--Reconstituted bamboo for indoor structure;
--Reconstituted bamboo for outdoor structure.
4.3 According to intensity level.
- 28E-165f;
- 18E-135f;
- 10E-90f.
5 Technical requirements
5.1 Specifications and deviations
5.1.1 Dimensions
The specifications and dimensions of the reconstituted bamboo for structural use shall meet the requirements in Table 1.
Note. After the agreement between the supplier and the buyer, other specifications of hot-pressed reconstituted bamboo can be produced
5.1.2 Dimensional deviation
The size deviation of the restructured bamboo used for the structure should meet the requirements of Table 2.
Note. Other specifications and size deviations are negotiated between the supplier and the buyer.
5.2 Appearance quality
The appearance quality of the restructured bamboo for structural use should meet the requirements of Table 3.
Note 1.Not obvious--Normal vision is not easy to distinguish under natural light, 0.4m from the board surface.
Note 2.The quality requirements for special appearance shall be agreed upon by the supplier and the buyer.
5.3 Physical and chemical properties
5.3.1 Physical properties
5.3.1.1 Reconstituted bamboo for indoor structure
The physical properties of the reconstituted bamboo for indoor structure should meet the requirements in Table 4.
5.3.1.2 Reconstituted bamboo for indoor structure
The physical properties of reconstituted bamboo for outdoor structure should meet the requirements in Table 5.
a. The specimen has undergone a cyclic test
5.3.2 Mechanical properties
Reconstituted bamboo for structure is divided into 3 strength grades, and the characteristic value index of mechanical properties of each strength grade should meet the requirements of Table 6.
For the reconstituted bamboo material whose performance index exceeds the strength grade of "28E-165f" in the table, the value should be determined according to the grade of "28E-165f";
The reconstituted bamboo whose performance index is between the two strength grades should be valued according to the lower strength grade; for the performance indicators below the table
Reconstituted bamboo with "10E-90 f" strength grade should not be used.
Note 1.The values in the table are the minimum values required to evaluate the characteristic values of the reconstituted bamboo samples;
Note 2."28E-165f" represents the characteristic value of the flexural elastic modulus of the reconstituted bamboo is 28.0 GPa and the characteristic value of the flexural strength is 165.0 MPa.
5.3.3 Flame retardant properties
When both the supplier and the buyer have requirements on the flame retardant performance, the flame retardant performance of the reconstituted bamboo used in the structure should meet the flame retardant requirements of LY/T 2381.
begging.
5.3.4 Resistance to biological durability
When both the supplier and the demander have requirements for anti-biological durability, the anti-corrosion, anti-termite and anti-mildew properties of the reconstituted bamboo for the structure should meet Table 7
Regulations.
Note. The level is determined by agreement between the supplier and the buyer.
6 Test method
6.1 Appearance quality test method
6.1.1 The height of the inspection platform is about 700mm;
6.1.2 The lighting source is three 40W fluorescent tubes, the distance between the tubes is about 400mm, and the length of the tube is parallel to the length of the board.
The height from the inspection platform is about 2m, and natural light should not affect the inspection;
6.1.3 The inspector should have normal eyesight (or corrected eyesight) and inspect one by one at both ends of the board length. The visual distance is 0.5m～1.5m, and the viewing angle is
30°～90°.
6.2 Specification size and deviation test method
6.2.1 Instruments and tools
6.2.1.1 Micrometer, precision 0.01mm.
6.2.1.2 Steel ruler, precision 0.5mm.
6.2.1.3 Steel tape, accuracy 1mm.
6.2.2 Length and width measurement
Carry out according to the method specified in GB/T 19367.
6.2.3 Thickness measurement
Carry out according to the method specified in GB/T 19367.
6.2.4 Edge verticality detection
Carry out according to the method specified in GB/T 19367..
6.2.5 Verticality detection
Carry out according to the method specified in GB/T 19367.
6.2.6 Flatness detection
Carry out according to the method specified in GB/T 19367.
6.3 Physical performance test methods
6.3.1 Determination of moisture content
Carry out according to the method specified in GB/T 30364.
6.3.2 Density determination
Carry out according to the method specified in GB/T 30364.
6.3.3 Expansion rate of water absorption width
Carry out according to the method specified in GB/T 30364.
6.3.4 Water absorption thickness expansion rate
Carry out according to the method specified in GB/T 30364.
6.3.5 Test method for formaldehyde emission
Carry out according to the method specified in GB 18580.
6.4 Test methods for mechanical properties
6.4.1 Test method for flexural modulus of elasticity
6.4.1.1 Principle
The flexural elastic modulus of the recombined bamboo is determined according to the relationship between load and deformation within the proportional limit stress when the recombined bamboo is bent under force.
6.4.1.2 Test equipment
6.4.1.2.1 For the 10,000-capacity testing machine, select the appropriate load range according to the product requirements, and the accuracy is 1% of the measured value. test
The radius of curvature of the support and the end of the indenter of the testing device is 30mm, and the horizontal distance between the center points of the two supports is 240mm.
6.4.1.2.2 The test measuring tool is a vernier caliper or other measuring tools, and the measurement size should be accurate to 0.1mm.
6.4.1.2.3 The range of the dial indicator is 0mm～10mm, accurate to 0.01mm.
6.4.1.3 Test piece
6.4.1.3.1 The size of the test piece is 300mm×20mm×20mm, and the length is along the grain direction.
6.4.1.3.2 The test preparation requirements and testing, and the adjustment of the moisture content of the test piece shall meet the relevant regulations of GB/T 1928 respectively.
6.4.1.3.3 It is allowed to use the same test piece as the bending strength test. The bending elastic modulus is measured first, and then the bending strength test is carried out.
6.4.1.4 Test procedure
6.4.1.4.1 Test the width and thickness of the test piece, the width is measured at the center point of the long side of the test piece; the thickness is measured at the intersection of the diagonals of the test piece
The amount is accurate to 0.1mm.
6.4.1.4.2 Place the test piece in the center of the two supports of the universal testing machine along the length direction, and use the three-part loading method.
Load along the thickness direction at a uniform speed, and measure the deformation of the specimen, as shown in Figure 1.
6.4.1.4.3 The upper and lower limit loads for measuring the deformation of the test piece are generally 600N～1000N, and the testing machine first loads to the lower limit at a uniform speed
Load, and record the displacement and deformation value corresponding to the lower limit load, then load to the upper limit load after 15s～20s, and record the upper limit load
The corresponding displacement and deformation value is unloaded immediately. Repeat this three times, each unloading should be slightly lower than the lower limit load, and then load to the upper limit
Load.
6.4.1.5 Result calculation
According to the deformation values of the specimens measured in the last two times, the average values of the upper and lower limit deformations, and the average of the upper and lower limit loads are calculated.
The difference between the values is the deformation value between the upper and lower limit loads.
6.4.2 Test method for bending strength
6.4.2.1 Principle
Use an indenter to apply a load at a uniform speed in the middle of the span of the test piece until the test piece is destroyed to determine the bending strength of the recombined material.
6.4.2.2 Test equipment
6.4.2.2.1 For the 10,000-capacity testing machine, select the appropriate load range according to the product requirements, and the accuracy is 1% of the measured value. test
The radius of curvature of the support and the end of the indenter of the testing device is 30mm, and the horizontal distance between the center points of the two supports is 240mm.
6.4.2.2.2 The test measuring tool is a vernier caliper or other measuring tools, and the measurement size should be accurate to 0.1mm.
6.4.2.3 Test piece
6.4.2.3.1 The size of the test piece is 300mm×20mm×20mm, and the length is along the grain direction.
6.4.2.3.2 The test preparation requirements and testing, and the adjustment of the moisture content of the test piece shall meet the relevant regulations of GB/T 1928 respectively.
6.4.2.3.3 It is allowed to use the same test piece as the measurement of the bending elastic modulus. The bending elastic modulus is measured first, and then the bending strength test is carried out.
6.4.2.4 Test procedure
6.4.2.4.1 Test the width and thickness of the test piece, the width is measured at the center point of the long side of the test piece; the thickness is measured at the intersection of the diagonals of the test piece
The amount is accurate to 0.1mm.
6.4.2.4.2 Place the test piece on the two supports with a certain span on the test device along the length direction.
Distance from the middle, use the center line to load, load along the thickness direction at a uniform speed, the test piece should be destroyed within 1min ~ 2min, the record is broken
Bad load, accurate to 10N.
6.4.2.5 Result calculation
The bending strength of the test piece is calculated according to formula (5) and is accurate to 0.1 MPa.
6.4.3 Test method for tensile strength along the grain
6.4.3.1 Principle
Along the grain direction of the specimen, a tensile force is applied at a uniform speed until the specimen is destroyed to determine the tensile strength of the reconstituted bamboo along the grain.
6.4.3.2 Test equipment
6.4.3.2.1 For the 10,000-capacity testing machine, select the appropriate load range according to the product requirements, and the accuracy is 1% of the measured value. test
The stroke of the cross head, chuck or other fixtures of the inspection machine should not be less than 400mm, the jaw size of the clamp is 10mm～20mm, and
There are spherical sliding joints to ensure that the test piece is pulled along the longitudinal axis to prevent longitudinal distortion.
6.4.3.2.2 The measuring tool is a vernier caliper or other measuring tools, and the measuring size should be accurate to 0.1mm.
6.4.3.3 Specimen size
6.4.3.3.1 The shape and size of the test piece are shown in Figure 2.
6.4.3.3.2 The production requirements and testing of test pieces, and the adjustment of the moisture content of test pieces shall comply with the relevant regulations of GB/T 1928.
6.4.3.3.3 The texture of the test piece shall be straight, and the transition arc surface between the effective part of the test piece and the clamping parts at both ends shall be smooth and consistent with the test piece.
The center line is symmetrical.
6.4.3.4 Test procedure
6.4.3.4.1 At the center of the effective part of the test piece, measure the thickness and width to the nearest 0.1 mm.
6.4.3.4.2 Clamp both ends of the test piece in the jaws of the testing machine so that the wide surface of the test piece is in contact with the jaws, and the two ends are exposed near the arc.
Out of 20mm ~ 25mm, vertically installed on the testing machine.
6.4.3.4.3 The test shall be loaded at a uniform speed, and the test piece shall be destroyed within 1.5min～2.0min, and the damage load shall be accurate to 100N.
6.4.3.4.4 If the pull-off part is not in the effective part of the test piece, the test result shall be discarded.
6.4.3.5 Result calculation
The tensile strength of the specimen along the grain is calculated according to formula (6), and is accurate to 0.1 MPa.
6.4.4 Test method for compressive strength along the grain
6.4.4.1 Principle
Apply pressure along the grain direction of the reconstituted bamboo at a uniform speed to failure to determine the compressive strength of the reconstituted bamboo along the grain.
6.4.4.2 Test equipment
6.4.4.2.1 Ten thousand abilities testing machine, select the appropriate load range according to the product requirements, the accuracy is 1% of the measured value, and
With spherical sliding support.
6.4.4.2.2 The test measuring tool is a vernier caliper or other measuring tools, and the measurement size should be accurate to 0.1mm.
6.4.4.3 Test piece
6.4.4.3.1 The size of the test piece is 30mm×20mm×20mm, and the length is along the grain direction.
6.4.4.3.2 The test preparation requirements and testing, and the adjustment of the moisture content of the test piece shall meet the relevant regulations of GB/T 1928 respectively.
6.4.4.4 Test procedure
6.4.4.4.1 At the center of the length of the test piece, measure the width and thickness to the nearest 0.1 mm.
6.4.4.4.2 Place the test piece at the center of the spherical sliding support of the testing machine, and load at a uniform speed within 1.5min～2.0min
The test piece is destroyed, that is, the pointer of the testing machine is obviously returned or the load of the digital display is significantly reduced. Record the failure load, the load is allowed
The accuracy measured by Xu is 100N.
6.4.4.5 Result calculation
The compressive strength along the grain of the test piece shall be calculated according to formula (7), with an accuracy of 0.1 MPa.
6.4.5 All horizontal grain compression test method
6.4.5.1 Principle
Determine the proportional limit load from the load-deformation diagram of the full compression test of the horizontal grain, and calculate the total compression ratio of the reorganized bamboo horizontal grain
The ultimate stress is shown in Figure 3.
Figure 3 Schematic diagram of proportional limit load value
6.4.5.2 Test equipment
6.4.5.2.1 Ten thousand abilities testing machine, select the appropriate load range according to the product requirements, the accuracy is 1% of the measured value, and
With spherical sliding support. The universal testing machine should have a recording device to record the load step distance of the load, which should not be greater than 50N/mm;
The scale interval for recording the deformation of the test piece shall not be greater than 0.01mm/mm.
6.4.5.2.2 The test measuring tool is a vernier caliper or other measuring tools, and the measurement size should be accurate to 0.1mm.
6.4.5.3 Test piece
6.4.5.3.1 The size of the test piece is 30mm×20mm×20mm, and the length is along the grain direction.
6.4.5.3.2 Test preparation requirements and testing, and adjustment of test specimen moisture content shall be in accordance with the relevant regulations of GB/T 1928.
6.4.5.4 Test procedure
6.4.5.4.1 Measure the length of the test piece and the width at the center of the length to the nearest 0.1 mm.
6.4.5.4.2 Place the test piece at the center of the spherical sliding support of the testing machine, and load it in the thickness direction.
6.4.5.4.3 The test shall be loaded at a uniform speed, and the proportional limit load shall be reached within 1min to 2min.
6.4.5.4.4 Record the load deformation and proportional limit load value, which is accurate to 50N.
6.4.5.5 Result calculation
The ultimate compressive stress ratio of all transverse grains of the test piece shall be calculated according to formula (8), accurate to 0.1 MPa.
6.4.6 Local compression test method for transverse grain
6.4.6.1 Principle
From the load-deformation diagram of the horizontal grain local compression test, determine the proportional limit load, and calculate the partial compression ratio of the recombinant bamboo horizontal grain
The ultimate stress is shown in Figure 3.
6.4.6.2 Test equipment
6.4.6.2.1 Ten thousand abilities testing machine, select the appropriate load range according to the product requirements, the accuracy is 1% of the measured value, and
With spherical sliding support. The testing machine should have a recording device to record the load step distance of the load, which should not be greater than 50N/mm; record the change of the specimen
The scale interval of the shape should not be greater than 0.01mm/mm.
6.4.6.2.2 The measuring tool is a vernier caliper or other tools, and the measuring size should be accurate to 0.1mm.
6.4.6.3 Test piece
6.4.6.3.1 The size of the test piece is 60mm×20mm×20mm, and the length is along the grain direction.
6.4.6.3.2 The test preparation requirements and testing, and the adjustment of the moisture content of the test piece shall meet the relevant regulations of GB/T 1928 respectively.
6.4.6.4 Test procedure
6.4.6.4.1 Measure the width at the center of the length of the test piece.
6.4.6.4.2 On the wide section of the test piece, draw two parallel lines perpendicular to the long axis at a distance of 20 mm from both ends.
6.4.6.4.3 Place the test piece on the spherical sliding support of the testing machine so that the center of the test piece is at the center of the support, and load along the thickness direction.
The length, width and thickness of the pressurized steel block are 30mm×20mm×10mm.
6.4.6.4.4 The load shall be applied at a uniform speed in the test, and the proportional limit load shall be reached within 1min～3.0min.
6.4.6.4.5 Record the load deformation and proportional limit load value, which is accurate to 50N.
6.4.6.5 Result calculation
The local compressive ratio limit stress of the transverse grain of the test piece shall be calculated according to formula (9), accurate to 0.1 MPa.
6.4.7 Test method of along-grain shear strength
6.4.7.1 Principle
The shear force formed by the pressurized method causes one surface of the specimen to slide along the grain to the other surface to determine the shear strength of the recombinant bamboo along the grain.
6.4.7.2 Test equipment
6.4.7.2.1 Ten thousand abilities testing machine, select the appropriate load range according to the product requirements, the accuracy is 1% of the measured value, and
With spherical sliding support.
6.4.7.2.2 Along the grain shear test device, see Figure 4.
6.4.7.2.3 The test measuring tool is a vernier caliper or other measuring tools, and the measurement size should be accurate to 0.1mm.
6.4.7.3 Test piece
6.4.7.3.1 The shape and size of the test piece are shown in Figure 5.The shear surface of the test piece shall be a thick section, and the length shall be along the grain direction.
6.4.7.3.2 The production requirements and testing of test pieces, and the adjustment of test piece moisture content shall meet the relevant regulations of GB/T 1928 respectively.
6.4.7.3.3 The angle of the missing part of the test should be 106º40, and the angle gauge should be used for inspection, and the allowable error is ±20.´
6.4.7.4 Test procedure
6.4.7.4.1 The thickness and length of the shear surface of the test specimen shall be accurate to 0.1 mm.
6.4.7.4.2 Place the test piece on the L-shaped pad 3 of the test device, see Figure 5.Adjust the screws 4 and 5 so that the top of the test piece is on the I side (see
Figure 6) The upper part is close to the adjacent two sides of the upper concave corner of the test device until the test piece does not move. Then place the pressure block 6 on the slope II of the test piece,
And make its side close to the main body of the test device.
6.4.7.4.3 Place the test device with the test piece on the testing machine so that the center of the pressure block 6 is aligned with the center of the indenter on the testing machine.
6.4.7.4.4 The test shall be loaded at a uniform speed, and the test piece shall be destroyed within 1.5min～2.0min, and the load reading shall be accurate to 10N.
6.4.7.5 Result calculation
The along-grain shear strength of the test piec...
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