Some standard content:
Preface
Article 4.3 of this standard is mandatory, and the rest are recommended. The degree of consistency between this standard and DIN16730-1986 "Requirements for Plasticizer-Containing Vinyl Chloride (PVC-P) Plastic Roofing Membranes Incompatible with Asphalt" is not equivalent.
The main differences between this standard and DIN16730 The difference is: the addition of fiber single-sided composite and fabric-reinforced polyvinyl chloride waterproof membrane; it is divided into type I and type II according to performance:
-N type II type product has a tensile strength lower than the requirements of DIN16730. The elongation at break and low-temperature bending property are higher than the requirements of DIN16730; the water vapor permeability coefficient is cancelled.
This standard replaces GB12952-1991 "Polyvinyl chloride waterproof membrane". The main difference between this standard and GB12952-1991 is that the product models are divided into type 1 and type I, the coal tar type polyvinyl fluoride flexible membrane (3.1 in the 1991 version; 3.1 in this version) is canceled; single-sided fiber is added Category of composite and fabric-reinforced coils (3.1 of this edition); for a pair of single-sided fiber composite and fabric-reinforced coils, the tensile strength per unit width is used instead of tensile strength, and the breaking elongation between tools is used instead of the breaking elongation between markings. rate, the shape of the specimen was changed (5.7 of the 1991 edition, 5.5.3 of this edition): the test methods for impermeability and adhesion were adjusted, and specific requirements were given for the durability test method (5.12 of the 1991 edition) , 5.14; 5.10, 5.13 of this version).
This standard is proposed by the China Building Materials Industry Association. This standard is under the jurisdiction of the National Technical Committee for Standardization of Lightweight and Decorative Building Materials (CSBTS/TC195). The units responsible for drafting this standard are: Suzhou Waterproof Materials Research and Design Institute of China Chemical Building Materials Corporation, National Institute of Standardization of Building Materials Industry, Shanghai Building Science Institute. Units participating in the drafting of this standard: Jinan Sarnai Waterproofing System Co., Ltd., Shandong San Plastic Group Jinan Zhongdeli Plastic Co., Ltd., Shanghai Huili Building Materials Co., Ltd. No. 3 Factory, Taiyuan Wanjia Waterproof Material Co., Ltd., Shandong Xinda Group New Plastics factory. The main drafters of this standard: Zhu Zhiyuan, Han Zhenxiong, Xu Liping, Yang Bin, Zhong Yong, Min Lingmin, Han Junguo, Chen Jianhua. The previous versions of the standard replaced by this standard are: GB12952-1991.
1 Scope
Polyvinyl chloride waterproofing membrane
GB12952-2003
This standard specifies the classification and marking, requirements and test methods of oxyethylene waterproofing membranes , inspection rules, marking, packaging, transportation and storage.
This standard applies to waterproofing membranes made of polyvinyl chloride as the main raw material for building waterproofing projects, including polyvinyl fluoride waterproofing membranes without composite layers, single-sided fiber composites and fabric-reinforced polyvinyl fluoride waterproofing membranes. 2 Normative reference documents
The provisions in the following documents become provisions of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. Version. For undated reference documents, the latest version applies to this standard, GB/T328 Test methods for asphalt waterproofing membranes
GB/T528-1998 Determination of tensile stress and strain properties of vulcanized rubber or thermoplastic rubber (eqvISO37:1994 ) GB/T13022-1991 Test method for tensile properties of plastic films GB/T18244-2000 Test method for aging of building waterproofing materials 3 Classification and labeling
3.1 Classification
Products are classified according to whether there is a composite layer, without composite The layer is classified as N type, the single-sided fiber composite type is L type, and the fabric-reinforced type is W type. Each type of product is divided into Type I and Type II based on physical and chemical properties. 3.2 Specifications
The coil length specifications are 10m, 15m, and 20m. Thickness specifications are: 1.2mm, 1.5mm, 2.0mm. Other length and thickness specifications can be negotiated by both parties. The thickness specification should not be less than 1.2mm, 3.3 mark
According to product name (code name PVC coiled material), exposed or non-exposed, type, type, thickness, length and standard sequence marking example:
Length 20m, width 1.2m, thickness 1.5mm Type II type L exposed PVC waterproof membrane is marked: PVC membrane exposed LI1.5/20X1.2 GB 12952~2003
4 Technical requirements
4.1 Dimensional deviation
The length and width shall not be less than 99.5% of the specified value. The thickness deviation and minimum single value are shown in Table 1.
GB12952—2003
Thickness
Degree
1.2
1.5
2.0
4.2 Appearance
Table 1 Thickness
Allowable deviation
±0.10
±0.15
±0.20
Minimum single value
1. 00||tt || 1.30 | Cut neatly and lengthen 150mtm. 4.2.2 The surface of the coiled material should be smooth, with neat edges, without cracks, holes, adhesion, bubbles and scars. 4.3 Physical and chemical properties
The physical and chemical properties of N-type coils without composite layers should comply with the requirements in Table 2. L type fiber single-sided composite and W type fabric reinforced coils should comply with the provisions of Table 3, Table 2N type coil physical and chemical properties
Sequence
No.
2||tt ||3
4
5
7
8
9
10
Tensile strength/MP:
Elongation at break/
Item
Dimensional change rate of heat treatment/%
Low bending property
Puncture resistance||tt| |Impermeability
Chanwww.bzxz.net
Adhesion under shearing/(N/mm)
Appearance
Thermal aging treatment
Slow corrosion
Artificial air volume accelerated aging
Change rate of tensile strength/%
Change rate of broken fur elongation/%
Low temperature bending property||tt ||Change rate of tensile strength/%
Change rate of elongation at break/%
Low temperature bending property
Change rate of tensile strength/%
Elongation at break Length change rate/%
Low-weight bending property
Note: The artificial climate accelerated aging performance does not need to be evaluated for non-exposed use. Type I
8.0
200
3.0
-20℃ no cracks
water-impermeable
water-impermeable
type
12. 0
250
2.0
-25℃ no cracks
3.0 or coil breakage
no blistering, Weak cracks, bonds and holes
±25
-15C without cracks
±25
-15℃ without cracks
±25|| tt||No cracks at ~15℃
Table 3 Physical and chemical properties of L and W type coils
Sequence
1
2
3||tt ||4
No.
Tensile force/(N/em)
Breaking length rate/%
Dimensional change rate of heat treatment/%
Low temperature, etc. Foldability
item
item
type I
100
150
1.5
-20℃ no cracks| |tt||±20
—No cracks at 20℃
±20
—No cracks at 20℃
±20
No cracks at -20℃ | |tt | tt||6
8
9
No.
10
Puncture resistance
Impermeability
item
Adhesion under shear condition/(N/mm)
Thermal aging treatment
Resistant to chemical attack
Accelerated aging by artificial climate
Appearance
Table 3 (continued)
L.Class
W class
Change rate of tensile force/%
Change rate of elongation at break/%
Low temperature bending property
Change rate of tensile force/%
Change rate of elongation at break/%
Low temperature bendability
Change rate of tensile force/%
Change rate of elongation at break/%
Low temperature bending property
Note: The artificial climate accelerated aging performance does not need to be assessed for non-exposed use. Test method
5.1
Standard test conditions
Overflow: (23±2)℃.
Relative humidity: (60±15)%.
5.2
Specimen preparation
G
E
G
G
H
Fig. 1 Cutout of specimen
Type 1
Impermeable
Impermeable
GB 12952—2003
Type I
3.0 or Coil damage
6.0 or roll damage
No blistering, cracks, adhesion and pores
±25
No cracks at 15℃||tt| |±25
No cracking at 15℃
±25
No cracking at 15℃
1-2
1-2
[-2
±20
-20℃ no crack
± 20
-20℃ no cracking
±20
No cracks at -20℃
[-3
1-3
13
Place the tested sample under standard test conditions for 24h, and cut it according to Figure 1 Table 4 Take the required test piece, and the distance between the test piece and the edge of the coil should not be less than 100mm. When cutting fabric-reinforced rolls, you should follow the direction of the fabric and try to ensure that the working part has the largest number of fibers. 5.3 Dimensional deviation | Measure the width and length at three places at the end and middle, and multiply the average length by the average width to get the area of ??each roll. If there is a joint, it is calculated by subtracting 150mm from the sum of the measured lengths of the two sections. 3
GB12952—2003
serial number
1
2
3
4
5
40
7
8
9
Stretch control performance
Dimensional change rate of heat treatment
Puncture resistance
No Water permeability
Low temperature bending
Adhesion under shear state
Thermal aging treatment
Slow chemical corrosion resistance
Accelerated aging by artificial climate
5.3.2 Thickness
5.3.2.1 N and W type coil thickness
Table 4 specimen size and quantity
symbol
number| |tt||AA
c
B
D
E
F
G
I-1.1- 2.I-3
H
Size (weave direction × transverse direction)/mm
120×25
100×100
150×150| |tt||150×150
100×50
200×300
300×200
300X200
300X200
通| |tt||6 each
3
3
3
2
2
3
3 each| | tt | Measure 5 points in the width direction of the coil, take one point inward from the edge of the coil length (100 ± 15) mm, divide the remaining 3 points equally among these two points, and use the average of the 5 points as the thickness of the coil , and report the smallest single value. 5.3.2.2 Thickness of L-type coiled materials
5.3.2.2.1 Reading microscope: minimum graduation value 0.01mm, minimum magnification 20 times. 5.3.2.2.2 For the L fiber single-sided composite membrane, take a 50mtm×50mm sample at each of the 5 points according to 5.3.2.1. Use a thin sharp blade along the width direction of each sample to cut it perpendicular to the surface of the sample. A test strip of approximately 50 mm x 2 mm. Be careful not to deform the cross section of the test strip (the cross section in the thickness direction). Place the cut surface of the test strip upward on the sample stage of the reading microscope, and read the thickness of the polyvinyl chloride layer of the material (excluding the fiber layer). For products with embossed patterns on the surface, calculate the thickness based on the tangent position of the outermost end of the pattern. Measure 4 points on each test strip. The thickness is expressed as the average of the 20 numerical values ??of the 5 test strips, and the smallest single value among the 20 points is reported. 5.4 Appearance
The appearance of the coil is inspected by visual inspection. .
5.5 Tensile properties
5.5.1 Tensile testing machine: It can measure tensile force and elongation at the same time, ensuring that the tensile test value is between 20% and 80% of the measuring range, with an accuracy of 1%; it can reach ( The stretching speed is 250±50)mm/min, and the measurement accuracy of the length measuring device is 1mm. 5.5.2 Tensile properties of N type coils
5.5.2.1 Test steps
The test pieces are cut according to the requirements of Table 4 in Figure 1, and the sleep bell type 1 that complies with 7.1 of GB/T528-1998 is used As shown in Figure 2, the specimen has a tensile speed of (250±50) mm/min, a clamp spacing of about 75 mm, and a distance between marking lines of 25 mm. Use the thickness meter required in 5.3.2.1 to measure the thickness of the marking lines and the three middle points, and take The median value is used as the specimen thickness. Place the test piece in the center of the holder without twisting it, and start the tensile testing machine. Read the maximum tensile force P of the specimen, the length L between the marking lines when the specimen breaks + If the specimen breaks outside the marking lines, the data will be invalid and a spare specimen will be used to make it up. 5.5.2.2 Calculation of results
Specimen The tensile strength is calculated according to formula (1), accurate to 0.1MPa: TS = P/(BX d)
where:
TS-
P
B-
Tensile strength, unit is MPa: - Maximum tensile force, unit is N (N);
- Width of the middle part of the specimen, unit is 1 meter (mm) : Thickness of the specimen, in millimeters (mm),
The elongation at break of the specimen is calculated by equation (2), accurate to 1%: +
(1
Medium:
E = 100(L, L,)/L
E——Elongation at break, unit is percentage (%): L
Starting standard of a specimen The distance between lines is 25mm;
L, - the distance between the marked lines when the specimen breaks, in millimeters (mtn). The arithmetic mean of the five longitudinal or transverse specimens is calculated as the test result A-||. tt||B
C-
D
Total length, minimum value 115:
Width of gauge section 6.0 + 0.4;
Gauge section Length 33±2:
End width 25±1;
R.--mostly light 25±2;
Small radius 14±1:
Standard The distance from the line is 25±1.
Figure 2N dumbbell type specimen
5.5.3L and W type coil tensile properties
5.5.3.1 Test steps| | tt | As shown in Figure 3, the extension speed of the specimen is (250 ± 50) mm/min, and the distance between the clamps is 50 mm. Place the specimen in the center of the holder without twisting, and start the tensile testing machine to read the maximum tensile strength of the specimen. Tensile force P, length L between clamps when the specimen breaks:
Unit: mm
C
Total length 120
B--parallel Part width 10±0.5;
C-gauge strand length 40±0.5
D
Wide part width 25±0.5;
R——--Large Radius 25±2;
Small radius 14±1,
Figure 3L, W type dumbbell-shaped specimen
5.5.3.2 Calculation of results
The tensile force of the specimen is calculated according to formula (3)
where
T
, accurate to 1N/cm:
T= P/B
Specimen tensile force, unit is Newton per centimeter (N/cm): + (3)
GB12952—2003
P.
B-
Maximum tensile force, unit is Newton (N);
Width of the middle part of the specimen, unit is centimeter (cm), the elongation at break of the specimen is calculated according to formula (4), accurate to 1%: E m100(1g—Ls)/La
Where:
E
L.
Elongation at break, unit is percentage (%); The distance between the initial clamps of the specimens is 50mm;
The distance between the clamps when a specimen breaks, in millimeters (mm) La
Calculate the arithmetic mean of the five longitudinal or transverse specimens as the test result. 5.6 Heat treatment dimensional change rate
5.6.1 Air blast oven, overflow control range is (room temperature ~ 200) ℃, temperature control accuracy ± 2 ℃. 5.6.2 Test steps
(4)
Cut the test piece according to Table 4 in Figure 1. The size of the test piece is a square of 100mm × 100mm. Mark the vertical and horizontal directions. Mark the measurement points on each side. As a reference line before and after processing of the specimen. Unit: mm
120
160
120
1
Handle:
One upboard:
3- --Rotating shaft
4
Down row plate:
5, 6---Set screws.
Figure 4 bending instrument
GB12952-2003
Under standard test conditions, place a steel ruler on the test piece, and use a vernier caliper to measure the vertical and horizontal lines between the test pieces. The initial length S, accurate to 0.1mm, place the specimen flat on the glazed tile backing board with a small amount of talc powder removed, and then place the backing board horizontally into a blast oven at (80 ± 2) C. Do not stack it. , kept at this temperature for 24 hours. Take it out and place it under standard test conditions for 24 hours, and then measure the length S at the vertical and horizontal lines, accurate to 0.1mm. || tt | |tt||R——heat treatment dimensional change rate, unit is percentage (%); S. - The initial length of the specimen in this direction, in millimeters (mm); S - the specimen and S. The length after processing in the same direction, in millimeters (mm). Calculate the average dimensional change rate of the three specimens in the longitudinal or transverse direction as the test results in the longitudinal or transverse direction. 5.7 Low temperature bendability
5.7.1 Test equipment
5.7.1.1 Low temperature box: adjustment range (0~30) C. Temperature control accuracy ±2°C. 5.7.1.2 Bending instrument: The distance between the upper and lower plates made of metal can be adjusted arbitrarily. The shape and size are shown in Figure 4. 5.7.2 Test steps
·(5)
Cut the specimen according to Figure 1 and Table 4, with the facing surface of the specimen facing outward, and bend it 180 degrees to make the 50mm wide edges coincide and flush , and fixed. Adjust the distance between the upper and lower plates of the bending instrument to 3 times the thickness of the rolled material. Open the bending instrument and place the two test pieces flat on the lower plate. The overlapping side faces the rotating axis and is 20mm away from the rotating axis. Put the bending instrument and the test piece into the cryogenic box at the set temperature. After reaching the specified temperature, place it at this temperature for 1 hour. Then press the upper plate down for 1 second at the temperature specified in the standard to reach the adjusted spacing position. After maintaining this position for 1 second, take out the specimen. After returning to room temperature, observe whether the side folds are broken, or use a 6x sensitive microscope. Observe whether there are any cracks at the bends of the specimen. 5.8 Puncture resistance
5.8.1 Test apparatus
5.B.1.1 Puncture meter: consists of a metal conduit with a scale, a movable weight that can move freely within it, a locking bolt and Composed of hemispherical steel punch. The tube scale length is (0~500)mm+grading value 10mm+weight weight 500g+steel ball diameter 12.7mm. 5.8.1.2 Glass tube: inner diameter not less than 30mm, length 600mm. 5.8.1.3 Aluminum plate, thickness not less than 4mm. 5.8.2 Test steps
Cut the test piece according to Table 4 in Figure 1, place the test piece flat on the aluminum plate, and place it on a foam polystyrene pad with a density of 25kg/m and a thickness of 50mm. The puncher is placed on the surface of the test piece, and the steel ball at the lower end of the punch is placed in the center of the test piece, so that the spherical surface is in contact with the test piece. Adjust the heavy chain to the specified drop height of 300m and position it. Let the weight fall freely and hit the punch located on the surface of the specimen. Then take out the specimen and check whether the specimen is perforated. Test three specimens. When there is no obvious perforation, use the device shown in Figure 5 to conduct a watertightness test on the specimen. Place the shaped glass tube vertically in the center of the perforation test point of the specimen, and seal the link between the glass tube and the specimen with sealant. Place the test piece on the filter paper (150mm or 150mm), place the filter paper on the glass plate, add dyed water into the glass tube, and check the filter paper after letting it stand for 24 hours. If there is discoloration or water stains, it indicates that the test piece has been perforated. 7
GB12952—2003
Glass tube:
2
3
4
5-
6-| |tt||Rongse water:
One filter paper,
One sample,
Glass plate;
Sealant.
5. 9 Water impermeability
009
330
Figure 5 Perforated water tightness test device
Unit: mm
5.9. 1 Water-impermeable instrument: The water-impermeable instrument specified in GB/T328 is used. The gland plate of the water-permeable plate adopts the golden slotted groove plate shown in Figure 6. 5.9.2 The test is carried out under standard test conditions. Cut the specimen according to Figure 1 and Table 4, and conduct the test according to GB/T328. Use the metal slotted groove plate shown in Figure 4. The pressure is 0.3MPa. Keep it for 2h. Observe the test. Check whether there is water seepage in the parts, and test 3 specimens.1 Test equipment
5.7.1.1 Low temperature chamber: adjustment range (0~-30)C. Temperature control accuracy ±2°C. 5.7.1.2 Bending instrument: The distance between the upper and lower plates made of metal can be adjusted arbitrarily. The shape and size are shown in Figure 4. 5.7.2 Test steps
·(5)
Cut the specimen according to Figure 1 and Table 4, with the facing surface of the specimen facing outward, and bend it 180 degrees to make the 50mm wide edges coincide and flush , and fixed. Adjust the distance between the upper and lower plates of the bending instrument to 3 times the thickness of the rolled material. Turn over the bending instrument and place the two specimens flat on the lower plate. The overlapping side faces the rotating axis and is 20mm away from the rotating axis. Put the bending instrument and the test piece into the cryogenic box at the set temperature. After reaching the specified temperature, place it at this temperature for 1 hour. Then press the upper plate down for 1 second at the temperature specified in the standard to reach the adjusted spacing position. After maintaining this position for 1 second, take out the specimen. After returning to room temperature, observe whether the side folds are broken, or use a 6x sensitive microscope Observe whether there are any cracks at the bends of the specimen. 5.8 Puncture resistance
5.8.1 Test apparatus
5.B.1.1 Puncture meter: consists of a metal conduit with a scale, a movable weight that can move freely within it, a locking bolt and Composed of hemispherical steel punch. The tube scale length is (0~500)mm+grading value 10mm+weight weight 500g+steel ball diameter 12.7mm. 5.8.1.2 Glass tube: inner diameter not less than 30mm, length 600mm. 5.8.1.3 Aluminum plate, thickness not less than 4mm. 5.8.2 Test steps
Cut the test piece according to Table 4 in Figure 1, place the test piece flat on the aluminum plate, and place it on a foam polystyrene pad with a density of 25kg/m and a thickness of 50mm. The puncher is placed on the surface of the test piece, and the steel ball at the lower end of the punch is placed in the center of the test piece, so that the spherical surface is in contact with the test piece. Adjust the heavy chain to the specified drop height of 300m and position it. Let the weight fall freely and hit the punch located on the surface of the specimen. Then take out the specimen and check whether the specimen is perforated. Test three specimens. When there is no obvious perforation, use the device shown in Figure 5 to conduct a watertightness test on the specimen. Place the shaped glass tube vertically in the center of the perforation test point of the specimen, and seal the link between the glass tube and the specimen with sealant. Place the test piece on the filter paper (150mm or 150mm), place the filter paper on the glass plate, add dyed water into the glass tube, and check the filter paper after letting it stand for 24 hours. If there is discoloration or water stains, it indicates that the test piece has been perforated. 7
GB12952—2003
Glass tube:
2
3
4
5-
6-| |tt||Rongse water:
One filter paper,
One sample,
Glass plate;
Sealant.
5. 9 Water impermeability
009
330
Figure 5 Perforated water tightness test device
Unit: mm
5.9. 1 Water-impermeable instrument: The water-impermeable instrument specified in GB/T328 is used. The gland plate of the water-permeable plate adopts the golden slotted groove plate shown in Figure 6. 5.9.2 The test is carried out under standard test conditions. Cut the test piece according to Figure 1 and Table 4, and conduct the test according to GB/T328. Use the metal slotted groove plate shown in Figure 4. The pressure is 0.3MPa. Keep it for 2h. Observe the test. Check whether there is water seepage in the parts, and test 3 specimens.1 Test equipment
5.7.1.1 Low temperature chamber: adjustment range (0~-30)C. Temperature control accuracy ±2°C. 5.7.1.2 Bending instrument: The distance between the upper and lower plates made of metal can be adjusted arbitrarily. The shape and size are shown in Figure 4. 5.7.2 Test steps
·(5)
Cut the specimen according to Figure 1 and Table 4, with the facing surface of the specimen facing outward, and bend it 180 degrees to make the 50mm wide edges coincide and flush , and fixed. Adjust the distance between the upper and lower plates of the bending instrument to 3 times the thickness of the rolled material. Turn over the bending instrument and place the two test pieces flat on the lower plate. The overlapping side faces the rotating axis and is 20mm away from the rotating axis. Put the bending instrument and the test piece into the cryogenic box at the set temperature. After reaching the specified temperature, place it at this temperature for 1 hour. Then press the upper plate down for 1 second at the temperature specified in the standard to reach the adjusted spacing position. After maintaining this position for 1 second, take out the specimen. After returning to room temperature, observe whether the side folds are broken, or use a 6x sensitive microscope Observe whether there are any cracks at the bends of the specimen. 5.8 Puncture resistance
5.8.1 Test instrument
5.B.1.1 Puncture meter: consists of a metal conduit with a scale, a movable weight that can move freely within it, a locking bolt and Composed of hemispherical steel punch. The tube scale length is (0~500)mm+grading value 10mm+weight weight 500g+steel ball diameter 12.7mm. 5.8.1.2 Glass tube: inner diameter not less than 30mm, length 600mm. 5.8.1.3 Aluminum plate, thickness not less than 4mm. 5.8.2 Test steps
Cut the test piece according to Table 4 in Figure 1, place the test piece flat on the aluminum plate, and place it on a foam polystyrene pad with a density of 25kg/m and a thickness of 50mm. The perforator is placed on the surface of the test piece, and the steel ball at the lower end of the punch is placed in the center of the test piece, so that the spherical surface is in contact with the test piece. Adjust the heavy chain to the specified drop height of 300m and position it. Let the weight fall freely and hit the punch located on the surface of the specimen. Then take out the specimen and check whether the specimen is perforated. Test three specimens. When there is no obvious perforation, use the device shown in Figure 5 to conduct a watertightness test on the specimen. Place the shaped glass tube vertically in the center of the perforation test point of the specimen, and seal the link between the glass tube and the specimen with sealant. Place the test piece on the filter paper (150mm or 150mm), place the filter paper on the glass plate, add dyed water into the glass tube, and check the filter paper after letting it stand for 24 hours. If there is discoloration or water stains, it indicates that the test piece has been perforated. 7
GB12952—2003
Glass tube:
2
3
4
5-
6-| |tt||Rongse water:
One filter paper,
One sample,
Glass plate;
Sealant.
5. 9 Water impermeability
009
330
Figure 5 Perforated water tightness test device
Unit: mm
5.9. 1 Water-impermeable instrument: The water-impermeable instrument specified in GB/T328 is used. The gland plate of the water-permeable plate adopts the golden slotted groove plate shown in Figure 6. 5.9.2 The test is carried out under standard test conditions. Cut the specimen according to Figure 1 and Table 4, and conduct the test according to GB/T328. Use the metal slotted groove plate shown in Figure 4. The pressure is 0.3MPa. Keep it for 2h. Observe the test. Check whether there is water seepage in each piece, and test 3 specimens.
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