Some standard content:
Engineering Construction Standard Full Text Information System
Construction Industry Standard of the People's Republic of China JG3063-1999
Concrete hollow panels contained industrial fly ash hand wasts slags for partition wall in buildings construction standards
1999-07-07 issued
The Ministry of Construction of the People's Republic of China issued
1999-12-01 implemented
Engineering construction standards full text information system
JG3063—1999
Cited standards
Product classification
Test methods
Inspection rules
Transportation and procurement
2
Engineering construction standards full text information system
JG3063—1999
This standard is written based on the functional requirements of building walls for industrial ash concrete strip products with cement as the binder. In terms of writing rules, GB/T1.1-1993 "Guidelines for Standardization Work Unit 1. Rules for Drafting and Presentation of Standards Part 1: Basic Regulations for Standard Writing" and GB/T1.3-1997 "Guidelines for Standardization Work Unit 1: Rules for Drafting and Presentation of Standards Part 3: Regulations for Writing Product Standards" are followed. In terms of technical content, in view of the wide application of this product in construction and the comprehensive utilization of industrial slag, when reflecting product performance, factors related to health, safety, environmental protection, and requirements for use performance, physical properties, stability performance, environmental adaptability, etc. are written in accordance with relevant national laws and regulations and mandatory standards, and relevant requirements are included in the standard, and limit values are specified at the same time. This standard is proposed by the Standard and Quota Research Institute of the Ministry of Construction of the People's Republic of China. This standard is under the jurisdiction of the China Building Standard Design Institute, the technical unit for building structural components standards of the Ministry of Construction. The main drafting units of this standard are: the Residential Building and Equipment Research Institute of the Ministry of Construction, Shenyang Sanzhong New Building Materials Products Co., Ltd., Beijing Construction Research Institute of the Coal Research Institute, Beijing Thermal Power Sanzhong New Building Materials Co., Ltd., Shandong Dezhou Huiyuan Lightweight Hollow Partition Board Factory, Liaoning Tiefa Mining Bureau Coal Research Stone Building Materials Products Factory, Beijing Wanhang Building Materials Co., Ltd. The main drafters of this standard are: Zhao Guoqiang, Gao Baolin, Wang Ding, Guo Aimin, Luo Qixin, Liu Qingzheng, Zhu Bolin, Huang Aiyue, Dong Jie. The Ministry of Construction's Residential Building and Equipment Research Institute is responsible for the interpretation of this standard. bzsosO，coEngineering Construction Standard Full Text Information System
Construction Industry Standard of the People's Republic of China Industrial ash concrete hollow partition wall strips
Concrete hollow panels contained industrial fly ashhand waste slags for partition wall in buildingsScope
JG3063—1999
This standard specifies the definition, product classification, requirements, inspection sampling, test methods, judgment rules and marking, transportation and storage of industrial ash concrete hollow partition wall strips.
This standard applies to concrete hollow panels made of fly ash, coal mill stone after burning or spontaneous combustion, slag, slag, aerated concrete debris and other industrial ash as aggregates for non-load-bearing internal partition walls in civil buildings. Concrete hollow partition wall strips made of fly ash ceramsite and ceramsite sand, shale ceramsite and ceramsite sand, natural pumice and other aggregates can refer to this standard for implementation.
2 Cited standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB175—1992 Portland cement, ordinary Portland cement GB/T701—1997 Hot-rolled low-carbon steel round wire rod GB/T1216—1985 Outside micrometer
GB1344—1992 Slag Portland cement, pozzolanic Portland cement and fly ash Portland cement GB14991998 Steel Jieyuan Yaoshi electric heating lathe belt auxiliary steel bar GB/T1596—1991 Fly ash used in cement and concrete GB67 63—1986 Standard for the Limitation of Radioactive Substances in Industrial Waste Slag for Building Materials GB9196—1988 Standard for the Control of Radioactive Substances in Building Materials Mixed with Industrial Waste Slag GB/T-99781088 Fire Resistance Test Methods for Building Components GB/T17431.1—1998 Lightweight Aggregates and Their Test Methods Part 1: Lightweight Aggregates
GB/T17431.2—1998 Lightweight Aggregates and Their Test Methods Part 2: Lightweight Aggregates Test Methods GB J 75—1984
JGJ63—-1989
JC209—1992
Code for measurement of building sound insulation
Standard for water for concrete mixing
Expanded perlite
Quick-hardening sulphoaluminate cement
JC714—1996
JC/T541—1994
JC/T572—1994
3 Definitions
Self-igniting coal stone lightweight aggregate
Alkali-resistant glass fiber non-robbing roving
The following definitions are adopted in this standard.
Industrial ash slag concrete hollow partition wall strips
The Ministry of Construction of the People's Republic of China approved concrete hollow panels contained industrial fly ash and waste on July 7, 1999 and implemented on December 1, 1999
.bzsoso,om Engineering Construction Standard Full Text Information System
slagsforpartitionwallinbuildingsA kind of machine-made strips used as non-load-bearing internal partition walls of civil buildings, with a porous hollow structure, and the total amount of industrial ash slag in the production raw materials is more than 40% (weight ratio).
Product classification
4.1 Product type
Industrial ash slag concrete hollow partition wall strips are divided into three types according to the component type: ordinary board, door frame board and lintel board. The product name code of industrial ash slag concrete hollow partition wall strips is GH, and the board type code is: ordinary board is PB, door frame board is MB, and lintel board is LB. 4.
Product type
Strips can adopt different tongue and hole forms according to different production processes. Figures 1 and 2 show the names of various parts, appearance and cross-sectional diagrams of industrial ash concrete hollow partition strips. Board edge
Warp groove
Figure 1 Names of various parts and appearance diagrams of industrial ash concrete hollow partition strips
Figure 2 Cross-sectional diagram of industrial ash concrete hollow partition strips 4.3 Product specifications
The main specification marking dimensions of the strips are:
Length mm×width mm×thickness mm: 2500~3000×600×90, 100 Other specifications and dimensions can be negotiated by both parties 4.4 Model
4.4.1 Marking method
Industrial ash concrete hollow partition strips are marked in the order of product name code (GH), characteristic code (see 4.1), main parameter code and standard number. The marking is compiled according to the following diagram method. . Engineering Construction Standard Full Text Information System
4.4.2 Marking Example
Revision serial number (in uppercase Chinese phonetic characters A, B, C in turn) Plate thickness, cm
Plate width, cm
Plate length, cm
Characteristic code PBMBLB)
Product code
Industrial ash concrete hollow partition wall strip door frame board with a plate length of 2640mm, a plate width of 600mm, and a plate thickness of 90mm. Marked as: GHMB264X60X9
JG3063-1999
5 Requirements
Raw materials
The raw materials used in the production of products must meet the requirements of the corresponding national standards or national industry standards in the following table. Table
Raw materials
Portland cement, ordinary Portland cement
Slag, volcanic ash, fly ash Portland cement Rapid hardening sulphoaluminate cement
Fly ash
Burned or self-combustion coal grinding stone
Fly ash ceramsite, fly ash ceramic sand
Shale ceramsite, shale ceramic sand
Natural pumice lightweight aggregate
Slag, ore,Aerated concrete main debris
Expanded perlite
Alkali-resistant glass fiber
Concrete mixing water
Appearance quality
The appearance quality of the strip board shall comply with the provisions of Table 1.
Table 1 Appearance quality
Exposed reinforcement fiber on the board surface, board panel edge board end: transverse and longitudinal thickness direction through cracks, each board surface crack, length 50mm~100mm, width 0.5mm~1mm, each honeycomb pore, long diameter 5mm~30mm each
Each piece
Missing edges and corners, width (mm) × length (mm) 10×25~20×30, each piece
Must meet the standards
GB1344
GBT1596.GB6763
541, GB6763
GB/T 17431.1~17431.2
GB6763
GB-6763
GB701GB1499
J/T5k2
≤2 places
≤3 places
≤2 places
bzsos,comInspection method
Engineering Construction Standard Full-text Information System
3 Dimension deviation
The dimensional deviation of the strip board shall conform to the provisions of Table 2
4 Physical and mechanical properties
Board surface flatness
Diagonal difference
Lateral bending
Specimen head width
Specimen head height
Rod groove width
Specimen groove depth
The physical and mechanical properties of the strip board shall conform to the provisions of Table 3. 2 Dimensional deviation
Allowable deviation
L/1250
3 Physical and mechanical properties
Impact resistance, times
Bending failure load, multiple of board self-weight
Compressive strength, MPa
Surface density, kg/m2
Relative moisture content, %
Drying shrinkage, mm/m
Hanging force, N
Air-weighted sound insulation, dB
Fire resistance, h
Radioactive specific activity limit, Cga/740+Cr/520+Cz/9600 and Cgz/4001)The corresponding use areas for different limit values of this indicator are shown in Table 4. Refers to
Test method
≤45/40/351)
Table 4 Relative moisture content of the corresponding use area for different relative moisture content limits of strips, %
Use area
Wet - refers to the area with an annual average relative humidity greater than 75%; - refers to the area with an annual average relative humidity of 50% to 75%; Medium -
Dry - refers to the area with an annual average relative humidity less than 50%. 40
Test method
Engineering construction standard full text information system
5.5 Production process method
Industrial ash concrete hollow partition strip products should be produced by mechanical molding production method. 6 Test face method
6.1 Test environment and test conditions
The test should be carried out under normal temperature and humidity environment. For all the strip samples submitted for testing, the curing age should not be less than 35 days if they are made of ordinary Portland cement, and the curing age should not be less than 14 days if they are made of sulphoaluminate cement. 6.2
Appearance quality inspection
For the inspected board, the sight distance is about 0.5m, and the exposed reinforcement and through cracks are visually inspected; the data of honeycomb pores, missing edges and corners of the board surface cracks are measured with a steel ruler with an accuracy of 0.5mm; and the number of defects is recorded. 6.3 Dimension deviation inspection
6.3.1 Length inspection
Measure at three places:
Two places on the edge of the board: 100mm away from the two edges of the board, parallel to the edge of the board; one place in the middle: passing the midpoint of the two ends of the board. As shown in Figure 3. Use a steel tape measure with an accuracy of 1mm to pull and measure, and take the arithmetic average of the three measurement data as the inspection result, and the data is accurate to 1mm. Figure 3 Length measurement position
6.3.2 Width inspection
Measure at three locations
Two locations at the ends of the board: 100mm away from the two ends of the board, parallel to the ends of the board; one location in the middle of the board: through the midpoint of the two edges of the board. As shown in Figure 4. Use a steel ruler with an accuracy of 1mm and a square ruler to measure, and take the arithmetic mean of the three measurement data as the inspection result, and the data is accurate to 1mm
Figure 4 Width measurement position
6.3.3 Thickness inspection
a) Arrange measurement points at 100mm from each end of the board, 100mm on both sides and the horizontal center line, as shown in Figure 5, and measure a total of six locations. b) Use a steel ruler with an accuracy of 0.5mm, or use an external caliper and a vernier caliper to measure, read the reading to 0.1mm, and record the measurement data. c) Take the arithmetic mean of the six measurement data as the inspection result, accurate to 1mm. bzsoso, cEngineering Construction Standard Full Text Information System
6.3.4 Board Surface Flatness Inspection
Figure 5 Thickness Measurement Position
a) Measure three locations on each of the two surfaces of the inspected board, for a total of six locations. The first location: make the midpoint of the ruler located at the center of the board surface, and the ruler body coincides with a diagonal line of the board surface; the other two locations: the ruler position is symmetrical about the center of the board surface, one end of the ruler is located at the end point of the other diagonal line of the board surface, and the other end of the ruler intersects with the opposite side of the board, as shown in Figure 6. The measurement position on the other side of the strip board is symmetrical to the position shown in the figure about the center of the strip board. bD Use a 2m ruler and a wedge-shaped feeler gauge to measure. Record the reading of the maximum gap between the ruler and the board surface at each location, and read the reading to 0.1mm. c) Take the arithmetic average of the six measurement data as the inspection result, accurate to 1mm. Figure 6 Measurement position of board surface flatness
6.3.5 Diagonal difference test
Use a steel tape measure with an accuracy of 1mm to measure the length of the two diagonals, and take the difference between the two measured data as the test result, accurate to 1mm
6.B.6 Lateral bending test
Straighten the measuring line along the board surface through the board edge end point, and use a steel ruler with an accuracy of 0.5mm to measure the lateral bending of the board edge, and take the maximum measurement value as the test result, accurate to 1mm.
6.3.7 Sample head width and sample head height test
Measure four times along the longitudinal direction of the sample head center line at the sample head end point and the three-point position. Use a steel plate ruler and internal and external calipers to measure, and read the reading to 0.1mm. Take the maximum and minimum values of the four measurement data as the test result, accurate to 1mm. 6.3.8 Sample groove width and sample groove depth test
Measure four times along the longitudinal direction of the sample groove center line at the sample groove end point and the three-point position. Measure with a steel plate ruler, and read to 0.1mm. Take the maximum and minimum values of the four measurement data as the test results, accurate to 1mm. 6.4 Physical and mechanical properties test
6.4.1 Impact resistance test
a) The length of the test strip shall not be less than 2000mm. b) Take three strips as a group of samples, assemble and fix them as shown in Figure 7, and the center distance between the upper and lower steel pipes is the length of the plate minus 100mm, that is, (L-100)mm. The plate joints are bonded with cement water glass mortar, in which the sand particle size is not more than 1mm. The plates are squeezed tightly, and the joints are overlapped with glass fiber cloth, and smoothed with cement water glass mortar. c) After 1 day, fix the standard sandbag filled with 30kg fine sand with a particle size of less than 2mm as shown in Figure 8 to a steel ring 100mm away from the plate surface with a rope of 15mm in diameter, so that the center of gravity of the sandbag in the hanging state is at a height of L/2. d) Pull the sandbag along the arc in a plane perpendicular to the plate surface with the rope length as the radius, so that the center of gravity is raised by 500mm (measured by a ruler), and then swing it freely and fall to impact the set position, repeating 5 times. e) Visually check whether there are through cracks on the back of the plate and record the test results. The test results are only valid for the strips within the length of the strips measured by hand. 1. Steel pipe (0.50mm), 2. Crossbeam fastening and straightening, 3. Fixed crossbeam (10* hot-rolled equal-angle steel), 4. Fixed frame; 5. Partition wall specimen assembled from a strip, 6. Standard sandbag, details as shown in Figure 8; 7. Hanging rope (diameter 15mm), 8. Hanging ring (inner diameter 52mm) Figure 7. Impact resistance test device
1. Canvas; 2. Sand injection port, 3. Leather (thickness 6mm, width 40mm, length 70mm) Figure 8. Standard sandbag
6. 4.2 Load test for resistance to deformation
a) The length of the test strip shall not be less than 2000mm. b) The strip that has completed the surface density test is simply supported on two parallel supports whose support length is greater than the width of the board (Figure 9), one of which is a fixed hinge support and the other is a rolling hinge support. The middle spacing of the supports is adjusted to (L-100)mm, and the lengths of the two ends are equal. -100
1-Loading brick code; 2-Bearing plate (100mm wide, 615mm thick steel plate), 3-Rolling hinge support (60mm steel column), 4-Fixed hinge support Figure 9 Load device for testing resistance to bending failure by uniformly distributed load method c) Stand still for 2 minutes without load, and apply load in five levels, each level of load is 20% of the dead weight of the board. d) Use stacking method to evenly load from both ends to the middle for a total of five piles, with equal lengths, uniform gaps, and the same width as the board. e) After each loading of the first four levels, let it stand for 2 minutes, and after the fifth level, let it stand for 5 minutes. After that, load it cyclically in this graded loading mode until it breaks.
f) The total load from the first level to the level before the fracture is recorded as the test result. g) The test result is only applicable to the strips within the length dimension of the measured strips. 6.4.3 Compressive strength test
a) Along the width direction of the strip, three unit body specimens with a thickness of the strip thickness, a height of 100mm, and a length of including a complete hole and two complete ribs between the holes are cut in sequence as a group of samples. h) The upper and lower surfaces of the specimens are processed to form planes parallel to each other and perpendicular to the cylindrical axis of the specimen hole. If necessary, cement mortar can be prepared to process the upper and lower surfaces, and adjusted to a level with a level ruler. c) Place the specimen on the pressure plate of the testing machine so that the axis of the specimen coincides with the pressure center of the pressure plate of the testing machine, and apply load at a rate of 0.3 to 0.5 MPa/s until the specimen is destroyed. Record the maximum failure load P. d) The compressive strength of each specimen is calculated according to formula (1) with an accuracy of 0.1 MPa. P
Where: R—compressive strength of the specimen, MPa; failure load, N;
length of the compressive surface of the specimen, mm;
—width of the compressive surface of the specimen, mm.
eThe compressive strength of the strip is expressed as the arithmetic mean of the compressive strengths of three specimens, accurate to 0.1MBa. 6.4.4 Surface density test
a) Take three strips with a moisture content not greater than 10% as a group of samples for testing, and weigh the weight G of the test strips with a scale with a range of not less than 150kg and an accuracy of not less than 0.5kg, and read the reading to 0.1kg. b) The surface density of each test strip is calculated according to formula (2), accurate to 0.1kg/m2. G
1000×1000
Where: pSurface density of the test strip kg/m
G——weight of the test strip, kg;
L——length of the test strip, mm;
B——width of the test strip, mm. c) The surface density of the strip is expressed as the arithmetic mean of the surface density of the two test strips, accurate to 0.kg/m26.4.5 Relative moisture content test
6.4.5.1 Moisture content test
a) Preparation of test pieces: Three unit test pieces are cut from the strips used for mechanical properties test along the width direction. The height of the test piece is 100mm, the length is the same as the width of the strip, and the thickness is the same as the thickness of the strip. If the test site of the test piece is far away from the sampling site, the test piece should be immediately sealed with a plastic bag after sampling. b) After the test piece is sampled, its sampling weight m1 is weighed immediately, accurate to 0.01kg. If the test piece is transported in a sealed plastic bag, the test piece and the packaging bag should be weighed before opening; then the weight of the packaging bag should be weighed. Before weighing, it should be observed whether there are water drops precipitated from the test piece in the bag. If there are water drops, the water drops should be wiped dry. Calculate the difference between the two weighings as the weight of the specimen when it is sampled, accurate to 0.01kg. c) Place the specimen in an electric blast drying oven and dry it at (105±5)℃ for 24h. Thereafter, weigh it every 2h until the difference between the two weighings does not exceed 0.2% of the latter weighing. d) When the specimen is cooled in the electric blast drying oven to a temperature not exceeding 20℃ from room temperature, take it out and immediately weigh its absolute dry weight mo, accurate to 0.01kg.
6.4.5.2 Water absorption test
1) Immerse the specimen after the tests of a) to b) of 6.4.5.1 of this standard in water at room temperature (15～25)℃, and the water surface should be at least 20mm higher than the specimen.bzsso.omEngineering Construction Standard Full Text Information System
2) Take it out after 24 hours, place it on a wire rack and drip water for 1 minute, then wipe off the water drops in the holes of the specimen and on the outer surface of the specimen with a wrung wet cloth, and immediately weigh its saturated weight m2, accurate to 0.01kg. 6.4.5.3 Calculation of test data and results a) The moisture content of each specimen is calculated according to formula (3), accurate to 0.1%. W=m1-mo×100
Where: W
Moisture content of the specimen, %
Sampling weight of the specimen, kg;
Absolute dry weight of the specimen, kg.
The moisture content W of the strip is expressed as the arithmetic mean of the moisture content of the three specimens, accurate to 0.1%. b) The water absorption of each specimen is calculated according to formula (4), accurate to 0.1%. m2-mo×100
Where: 2——Water absorption of the specimen, %
Weight of the specimen saturated with water, kg
Dry weight of the specimen, kg.
Water absorption of the strip is expressed as the arithmetic mean of the water absorption of the individual specimens, accurate to 0.1% c) The relative moisture content of the strip is calculated according to formula (5), accurate to 0.1%. Wix100
Where: [w
Relative moisture content of the tea board; %
Moisture content of a strip of board, %
Water absorption of a strip of board, %.
6.4.6 Explosive shrinkage test
(3)
(5)
a) Take a test strip and cut the test piece along the width direction of the plate, that is, a unit test piece with a height of 100mm and a length of 100mm including three complete holes and four complete ribs between the holes. Five pieces form a group of samples. b) Drill a hole with a diameter of 8~10mm and a depth of 14~18mm in the center of each end face of each test piece, pour cement slurry mixed with water glass into the hole, and then bury the shrinkage head shown in Figure 10 in the hole, so that the center line of each shrinkage head coincides with the center line of the test piece, and the length of the part of the shrinkage head exposed outside the test piece is between 5 and 1mm. Figure 10 Shrinkage head
c) After the test piece is prepared and placed for 1 day, check whether the probe is firmly installed, otherwise reinstall it. Immerse the prepared specimen in water at 20℃±2℃, with the water surface 20mm above the specimen, and soak for 72h. d) Take the specimen out of the water, wipe off the surface moisture with a wrung wet cloth, and clean the probe. Immediately measure the initial length 11 with a micrometer that complies with GB/T1216.
e) Place the specimen in a standard dry air room with a temperature of 20℃±2℃ and a relative humidity of (55±5)% to measure the shrinkage value. Measure every day.4 Surface density test
a) Take three strips with a moisture content of no more than 10% as a group of samples for testing, and weigh the weight G of the test strips with a scale with a range of no less than 150kg and an accuracy of no less than 0.5kg, and read the value to 0.1kg. b) The surface density of each test strip is calculated according to formula (2) with an accuracy of 0.1kg/m2. G
1000×1000
Where: p Surface density of the test strip kg/m
G——weight of the test strip, kg;
L——length of the test strip, mm;
B——width of the test strip, mm. c) The surface density of the strip is expressed as the arithmetic mean of the surface density of the two test strips, accurate to 0.kg/m26.4.5 Relative moisture content test
6.4.5.1 Moisture content test
a) Preparation of test pieces: Three unit test pieces are cut from the strips used for mechanical properties test along the width direction. The height of the test piece is 100mm, the length is the same as the width of the strip, and the thickness is the same as the thickness of the strip. If the test site of the test piece is far away from the sampling site, the test piece should be immediately sealed with a plastic bag after sampling. b) After the test piece is sampled, its sampling weight m1 is weighed immediately, accurate to 0.01kg. If the test piece is transported in a sealed plastic bag, the test piece and the packaging bag should be weighed before opening; then the weight of the packaging bag should be weighed. Before weighing, it should be observed whether there are water drops precipitated from the test piece in the bag. If there are water drops, the water drops should be wiped dry. Calculate the difference between the two weighings as the weight of the specimen when it is sampled, accurate to 0.01kg. c) Place the specimen in an electric blast drying oven and dry it at (105±5)℃ for 24h. Thereafter, weigh it every 2h until the difference between the two weighings does not exceed 0.2% of the latter weighing. d) When the specimen is cooled in the electric blast drying oven to a temperature not exceeding 20℃ from room temperature, take it out and immediately weigh its absolute dry weight mo, accurate to 0.01kg.
6.4.5.2 Water absorption test
1) Immerse the specimen after the tests of a) to b) of 6.4.5.1 of this standard in water at room temperature (15～25)℃, and the water surface should be at least 20mm higher than the specimen.bzsso.omEngineering Construction Standard Full Text Information System
2) Take it out after 24 hours, place it on a wire rack and drip water for 1 minute, then wipe off the water drops in the holes of the specimen and on the outer surface of the specimen with a wrung wet cloth, and immediately weigh its saturated weight m2, accurate to 0.01kg. 6.4.5.3 Calculation of test data and results a) The moisture content of each specimen is calculated according to formula (3), accurate to 0.1%. W=m1-mo×100
Where: W
Moisture content of the specimen, %
Sampling weight of the specimen, kg;
Absolute dry weight of the specimen, kg.
The moisture content W of the strip is expressed as the arithmetic mean of the moisture content of the three specimens, accurate to 0.1%. b) The water absorption of each specimen is calculated according to formula (4), accurate to 0.1%. m2-mo×100wwW.bzxz.Net
Where: 2——Water absorption of the specimen, %
Weight of the specimen saturated with water, kg
Dry weight of the specimen, kg.
Water absorption of the strip is expressed as the arithmetic mean of the water absorption of the individual specimens, accurate to 0.1% c) The relative moisture content of the strip is calculated according to formula (5), accurate to 0.1%. Wix100
Where: [w
Relative moisture content of the tea board; %
Moisture content of a strip of board, %
Water absorption of a strip of board, %.
6.4.6 Explosive shrinkage test
(3)
(5)
a) Take a test strip and cut the test piece along the width direction of the plate, that is, a unit test piece with a height of 100mm and a length of 100mm including three complete holes and four complete ribs between the holes. Five pieces form a group of samples. b) Drill a hole with a diameter of 8~10mm and a depth of 14~18mm in the center of each end face of each test piece, pour cement slurry mixed with water glass into the hole, and then bury the shrinkage head shown in Figure 10 in the hole, so that the center line of each shrinkage head coincides with the center line of the test piece, and the length of the part of the shrinkage head exposed outside the test piece is between 5 and 1mm. Figure 10 Shrinkage head
c) After the test piece is prepared and placed for 1 day, check whether the probe is firmly installed, otherwise reinstall it. Immerse the prepared specimen in water at 20℃±2℃, with the water surface 20mm above the specimen, and soak for 72h. d) Take the specimen out of the water, wipe off the surface moisture with a wrung wet cloth, and clean the probe. Immediately measure the initial length 11 with a micrometer that complies with GB/T1216.
e) Place the specimen in a standard dry air room with a temperature of 20℃±2℃ and a relative humidity of (55±5)% to measure the shrinkage value. Measure every day.4 Surface density test
a) Take three strips with a moisture content of no more than 10% as a group of samples for testing, and weigh the weight G of the test strips with a scale with a range of no less than 150kg and an accuracy of no less than 0.5kg, and read the value to 0.1kg. b) The surface density of each test strip is calculated according to formula (2) with an accuracy of 0.1kg/m2. G
1000×1000
Where: p Surface density of the test strip kg/m
G——weight of the test strip, kg;
L——length of the test strip, mm;
B——width of the test strip, mm. c) The surface density of the strip is expressed as the arithmetic mean of the surface density of the two test strips, accurate to 0.kg/m26.4.5 Relative moisture content test
6.4.5.1 Moisture content test
a) Preparation of test pieces: Three unit test pieces are cut from the strips used for mechanical properties test along the width direction. The height of the test piece is 100mm, the length is the same as the width of the strip, and the thickness is the same as the thickness of the strip. If the test site of the test piece is far away from the sampling site, the test piece should be immediately sealed with a plastic bag after sampling. b) After the test piece is sampled, its sampling weight m1 is weighed immediately, accurate to 0.01kg. If the test piece is transported in a sealed plastic bag, the test piece and the packaging bag should be weighed before opening; then the weight of the packaging bag should be weighed. Before weighing, it should be observed whether there are water drops precipitated from the test piece in the bag. If there are water drops, the water drops should be wiped dry. Calculate the difference between the two weighings as the weight of the specimen when it is sampled, accurate to 0.01kg. c) Place the specimen in an electric blast drying oven and dry it at (105±5)℃ for 24h. Thereafter, weigh it every 2h until the difference between the two weighings does not exceed 0.2% of the latter weighing. d) When the specimen is cooled in the electric blast drying oven to a temperature not exceeding 20℃ from room temperature, take it out and immediately weigh its absolute dry weight mo, accurate to 0.01kg.
6.4.5.2 Water absorption test
1) Immerse the specimen after the tests of a) to b) of 6.4.5.1 of this standard in water at room temperature (15～25)℃, and the water surface should be at least 20mm higher than the specimen.bzsso.omEngineering Construction Standard Full Text Information System
2) Take it out after 24 hours, place it on a wire rack and drip water for 1 minute, then wipe off the water drops in the holes of the specimen and on the outer surface of the specimen with a wrung wet cloth, and immediately weigh its saturated weight m2, accurate to 0.01kg. 6.4.5.3 Calculation of test data and results a) The moisture content of each specimen is calculated according to formula (3), accurate to 0.1%. W=m1-mo×100
Where: W
Moisture content of the specimen, %
Sampling weight of the specimen, kg;
Absolute dry weight of the specimen, kg.
The moisture content W of the strip is expressed as the arithmetic mean of the moisture content of the three specimens, accurate to 0.1%. b) The water absorption of each specimen is calculated according to formula (4), accurate to 0.1%. m2-mo×100
Where: 2——Water absorption of the specimen, %
Weight of the specimen saturated with water, kg
Dry weight of the specimen, kg.
Water absorption of the strip is expressed as the arithmetic mean of the water absorption of the individual specimens, accurate to 0.1% c) The relative moisture content of the strip is calculated according to formula (5), accurate to 0.1%. Wix100
Where: [w
Relative moisture content of the tea board; %
Moisture content of a strip of board, %
Water absorption of a strip of board, %.
6.4.6 Explosive shrinkage test
(3)
(5)
a) Take a test strip and cut the test piece along the width direction of the plate, that is, a unit test piece with a height of 100mm and a length of 100mm including three complete holes and four complete ribs between the holes. Five pieces form a group of samples. b) Drill a hole with a diameter of 8~10mm and a depth of 14~18mm in the center of each end face of each test piece, pour cement slurry mixed with water glass into the hole, and then bury the shrinkage head shown in Figure 10 in the hole, so that the center line of each shrinkage head coincides with the center line of the test piece, and the length of the part of the shrinkage head exposed outside the test piece is between 5 and 1mm. Figure 10 Shrinkage head
c) After the test piece is prepared and placed for 1 day, check whether the probe is firmly installed, otherwise reinstall it. Immerse the prepared specimen in water at 20℃±2℃, with the water surface 20mm above the specimen, and soak for 72h. d) Take the specimen out of the water, wipe off the surface moisture with a wrung wet cloth, and clean the probe. Immediately measure the initial length 11 with a micrometer that complies with GB/T1216.
e) Place the specimen in a standard dry air room with a temperature of 20℃±2℃ and a relative humidity of (55±5)% to measure the shrinkage value. Measure every day.6. Explosive shrinkage test
(3)
(5)
a) Take a test strip and cut the specimen along the width direction of the plate, that is, a unit specimen with a height of 100mm and a length of 100mm including three complete holes and four complete ribs between the holes. Five specimens form a group of samples. b) Drill a hole with a diameter of 8~10mm and a depth of 14~18mm in the center of each end face of each specimen, pour cement slurry mixed with water glass into the hole, and then bury the shrinkage head shown in Figure 10 in the hole, so that the center line of each shrinkage head coincides with the center line of the specimen, and the length of the part of the shrinkage head exposed outside the specimen is between 5 and 1mm. Figure 10 Shrinkage head
c) After the specimen is prepared and placed for 1 day, check whether the probe is installed firmly, otherwise reinstall it. Immerse the prepared specimen in water at 20℃±2℃, with the water surface 20mm higher than the specimen, and soak for 72h. d) Take the specimen out of the water, wipe the surface moisture with a wrung wet cloth, clean the probe, and immediately measure the initial length 11 with a micrometer that complies with GB/T1216.
e) Place the specimen in a standard dry air room with a temperature of 20℃±2℃ and a relative humidity of (55±5)% to measure the shrinkage value. Measure every day.6. Explosive shrinkage test
(3)
(5)
a) Take a test strip and cut the specimen along the width direction of the plate, that is, a unit specimen with a height of 100mm and a length of 100mm including three complete holes and four complete ribs between the holes. Five specimens form a group of samples. b) Drill a hole with a diameter of 8~10mm and a depth of 14~18mm in the center of each end face of each specimen, pour cement slurry mixed with water glass into the hole, and then bury the shrinkage head shown in Figure 10 in the hole, so that the center line of each shrinkage head coincides with the center line of the specimen, and the length of the part of the shrinkage head exposed outside the specimen is between 5 and 1mm. Figure 10 Shrinkage head
c) After the specimen is prepared and placed for 1 day, check whether the probe is installed firmly, otherwise reinstall it. Immerse the prepared specimen in water at 20℃±2℃, with the water surface 20mm higher than the specimen, and soak for 72h. d) Take the specimen out of the water, wipe the surface moisture with a wrung wet cloth, clean the probe, and immediately measure the initial length 11 with a micrometer that complies with GB/T1216.
e) Place the specimen in a standard dry air room with a temperature of 20℃±2℃ and a relative humidity of (55±5)% to measure the shrinkage value. Measure every day.
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