JG/T 3029-1995 Lightweight strips for residential interior partitions JG/T3029-1995
Some standard content:
Engineering Construction Standard Full-text Information System
Construction Industry Standard of the People's Republic of China JG/T
3029-1995
Light longish panels for internal partitions in residence
Published on December 13, 1995
Ministry of Construction of the People's Republic of China
Implemented on July 1, 1996
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Subject Content and Scope of Application
Referenced Standards
Product Classification
Technical Requirements
Testing Notes
Inspection Rules
Marking, Transportation, Storage
(1)
Engineering Construction Standard Full-text Information System
Construction Industry Standard of the People's Republic of China Light Longish Panels for Internal Partitions in Residence
Light longish panels for internal partitions in residence
Subject content and scope of application
JG/T3029—1995
This standard specifies the terminology, classification, technical requirements, test methods, inspection rules and product marking, transportation and storage of lightweight stripboard products for residential internal partitions.
This standard applies to lightweight stripboards for non-load-bearing internal partitions in residential buildings (hereinafter referred to as lightweight stripboards). Lightweight stripboards for general civil buildings can refer to this standard. 2 Reference standards
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) GB2828
GB8625
Test methods for flame retardancy of building materials
GB9978 Test methods for fire resistance of building components
GBJ75 Specification for measurement of building sound insulation
3 Terminology
Lightweight strip board. Prefabricated non-load-bearing interior partition board with a surface density of less than 60kg/m2, a board weight of not more than 100kg, and an aspect ratio of not less than 2.5. 4 Product classification
4.1 Lightweight strip boards are divided into three categories according to the cross section: hollow strip boards, solid strip boards and sandwich strip boards. According to the type of board components, they are divided into ordinary boards, door frame boards, window frame boards, and lintel boards
The product categories and codes of lightweight strip boards are shown in Table 1. Table 1 Product categories and codes of lightweight strips
Board category
Hollow strips
Solid strips
Sandwich strips
Board type category
Ordinary board
Door frame board
Window frame board
Lintel board
4.2 Lightweight strips can adopt different tongue and hole forms, but they should all meet the requirements of Article 3 of this standard. Figures 1 and 2 are schematic diagrams of the appearance and cross-section of hollow strips.
The Ministry of Construction of the People's Republic of China 199512-13 Issued 1996-07-01 Implementation
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Joint groove
Figure 1 Schematic diagram of the appearance of hollow strips
Figure 2 Schematic diagram of the cross-section of hollow strips
Note: The schematic diagram is only used to express geometric dimensions and explain terms. 4.3 Specifications and dimensions
4.3.1 Length mark dimension L is the floor height minus the floor thickness and the technical processing space size. 28b0mm
The length mark dimension is calculated according to formula (1).
L=H—(t+h)
One length mark dimension, mm;
One floor height, mm;
t—One floor thickness dimension, mm;
h—Technical processing space size, mm.
The optimized parameters for floor height are: 2700mm,
4.3.2 The width mark dimension B is 3M·n (n=1, 2, 3...), the optimized parameter is 600mm, and the auxiliary dimension is incremented by M/2. Note: M is the basic modulus symbol, and the value is 100mm. 4.3.3 The minimum thickness mark dimension T is 50mm, incremented by M/10, and the optimized parameter is 60mm. 4.4 Product model compilation
4.4.1 Compilation method
The product model of lightweight strip board shall be compiled according to the following diagram method. Engineering Construction Standard Full Text Information System
Board thickness, cm
Board width, cm
Board length.cm
Board type code, species code
The product model consists of board type category code (see Table 1), board species category code (see Table 1) and main parameters (board length, width and thickness). 4.4.2 Marking example
Hollow partition board with a length of 2540mm, a width of 600mm and a thickness of 60mm, namely, door frame board, is marked as: MBK254X60X6JG/T3029—1995
5 Technical requirements
Raw materials
All aggregates, cementitious materials and reinforcing materials used in the production of lightweight strips shall comply with the relevant national standards. Appearance quality
The appearance quality of lightweight strips shall comply with the requirements of Table 2. Table 2 Appearance quality
Exposed fibers, flash burrs, through cracks Board surface cracks, length 10~30mm, width 0~1mm Honeycomb bullholes, long diameter 5~30mm, depth 2~5mm Mesh
Missing edges and corners, depth (mm) × width (mm) × length (mm): 5×10×25~10×20×305.3 Tongue and groove size
The geometric size symbols of the joint groove and the implant head groove are shown in Figure 2. The size range shall comply with the provisions of Table 3 Table 3 Tongue and groove size range
5.4 Size deviation
According to the seam groove depth
Joint groove width
Sample head width
Sample head height, sample groove depth
Sample groove section
The size deviation of the lightweight strip board shall comply with the provisions of Table 4. Unit
Size range
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Slab surface flatness
Diagonal difference
Lateral bending
Physical and mechanical properties
Allowable deviation
L/1000
Table 4 Size deviation
Joint groove width
Joint groove depth
Sample head width
Sample head height
Sample groove width
Sample groove depth
The physical and mechanical properties of lightweight strip board products shall comply with the provisions of 5.5.1 to 5.5.8. 5.5.1
Surface density: not more than 60kg/m2
Drying shrinkage value: not more than 0.8mm/m.
Airborne sound insulation: not less than 30dB.
Fire resistance limit: not less than 1h.
Combustibility: non-combustible.
Flexural failure load: the flexural failure load value is not less than 0.75 times the deadweight of the board. Impact strength: withstand the swing impact of 30kg sandbags with a drop height of 0.5m three times, and no through cracks will appear. Single-point hanging force: subjected to 800N single-point hanging force for 24h, no through cracks will appear. Test method
Test piece state adjustment
Allowable deviation
Before conducting the 6.4.2 test, the test piece should be placed at 20℃±3℃, temperature 100% for 48h, and the test piece should be state adjusted. 6.2 Appearance quality inspection
For the tested board, the sight distance is about 0.5m, and the exposed fibers, burrs and through cracks are visually inspected; the board surface cracks, honeycomb pores, and missing edges and corners are measured with a steel ruler with an accuracy of 0.5mm, and the number of defects is recorded. 6.β Ruler deviation inspection
6.β.1 Length
Measure three places:
100mm from each edge of the board, parallel to the edge of the board; through 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 as the test result. Figure 3 Length measurement position
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6.3.2 Width
Measure three places:
Board end width: 100mm away from both ends of the board, parallel to the board end; Board middle width: through the midpoint of the two board edges, as shown in Figure 4. Use a steel tape measure with an accuracy of 1mm to pull and measure, and take the arithmetic mean as the test result. Figure 4 Width measurement position
Measure six places. Arrange measuring points at 100mm from both ends of the board and 100mm on both sides, as shown in Figure 5. Ruler, or use external calipers and vernier calipers to measure, and take the arithmetic mean as the test result. Figure 5 Thickness measurement position
6.B.4 Surface flatness
Use a tape measure with an accuracy of 0.Measure three places with a 5mm steel ruler
. Measure with a 2m ruler and a wedge-shaped feeler gauge. The first place: make the midpoint of the ruler be at the center of the board, and the other two ruler positions be symmetrical to the first ruler position, and make one end of the ruler be at the edge or end of the board. Take the arithmetic mean of the maximum gap between the three rulers and the board surface as the test result.
6.3.5 Diagonal difference
Use a steel ruler with an accuracy of 1mm to measure the length of the two diagonals, and take the difference as the test result. 6.3.6 Lateral bending
Straighten the measuring line along the board surface through the end point of the board edge, measure the lateral bending of the board with a steel ruler with an accuracy of 0.5mm, and take the maximum value as the test result. bzxZ.net
Tongue and groove dimensions
Use a steel ruler with an accuracy of 0.5mm, or use a vernier caliper, internal caliper, or external caliper to measure the width, depth, sample head width, height, groove width, and depth of the joint groove at both ends of the board. Take the arithmetic mean of the two measured data of each item as the test result of the item. 6.4 Physical and mechanical properties test
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6.4.1 Surface density test
Use a platform scale with a range of not less than 100kg and an accuracy of more than 1kg to weigh the board. Calculate the surface density of the lightweight strip board according to formula (2), accurate to 0.1kg/m2, and take the integer as the test result.
PA=10-LB
Formula: PA
Surface density of lightweight board, kg/m3:
Weight of lightweight board, kg;
Length of lightweight board, mm;
Width of lightweight board
6.4.2 Drying shrinkage value test
a. Instruments and equipment
(2)
Universal length measuring instrument: accuracy is 0.002mm, and the measuring length range is 01000mm. Place in a constant temperature and humidity test room with a temperature of 20℃±3℃ and a relative humidity of (60±%).
Shrinkage head: Made of stainless steel or brass, as shown in Figure 6. Ix45
Figure 6 Shrinkage head
Electric blast drying oven
Temperature and humidity control oven
Drying device
S in 45
its gold/25
A group of three test pieces with a size of 60mmXTmm×Bmm are cut along the width direction of the lightweight strip board (dT, B see Figure 1). b.
Drill a hole with a diameter of 6~10mm and a depth of 13mm in the center of the two side planes of the cut test piece. Pour cement water glass slurry (or other adhesive) into the hole, and then bury the shrinkage head. The center line of the shrinkage head should coincide with the center line of the test piece. After 2h, check whether the shrinkage head is installed firmly, otherwise reinstall it.
d. Place the specimen for 1 day and immerse it in water for 72 hours. The water temperature is maintained at 20℃±3℃. Take the specimen out of the water, wipe off the surface moisture with a damp cloth and clean the shrink head. e.
Adjust the plane measuring cap of the universal length measuring instrument to a parallel position. Gently place the specimen on the universal workbench and adjust the measuring axis to coincide with the center line of the specimen. Align the initial indication of the reading microscope, immediately measure the initial length of the specimen, and calibrate it according to the correction value table of the millimeter scale of the instrument.
Place the specimen in a temperature and humidity control box, control the temperature in the box to 50℃±1℃, and the relative humidity to (30±2)% (when the humidity in the box drops to 35%, put in a porcelain plate containing a saturated solution of calcium chloride to adjust the humidity in the box; if the humidity is difficult to drop, use anhydrous calcium chloride to adjust it).
h. Take out the specimen from the box once a day. After the specimen is taken out, it shall be immediately placed in a drying device without desiccant and cooled in a room at 20℃±2℃ until the surface temperature reaches 20℃±2℃ before testing. Before testing, the universal length measuring instrument shall be readjusted as described in 6.4.2f. Each group of specimens shall be tested within 10min.
i. Repeat drying, cooling and testing as described in 6.4.2g and 6.4.2h until the difference in the length readings of any 2 days within 3 consecutive days is less than 0.01mm. This value is the length of the specimen after drying. j. Drying shrinkage value shall be calculated according to formula (3):
Where: s
Drying shrinkage value, mm/m,
--initial length of specimen, mm;
12--length of specimen after drying, mm;
The sum of the lengths of the two shrinkage heads mr
k. The arithmetic mean of the test values of the three specimens is the test result. The average value is accurate to 0.1mm/m. 6.4.3 Airborne sound insulation test
Perform in accordance with the provisions of GBJ75.
6.4.4 Fire resistance test
Perform in accordance with the provisions of GB9978.
Flammability test
Perform in accordance with the provisions of GB8625.
6.4.6 Bending failure load test
(3)
The lightweight strip board that has completed the surface density test is simply supported on two parallel supports with a length greater than the width of the board (see Figure 7), 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 protruding lengths at both ends are equal. First, let it stand for 2 minutes without load, and then load it in five levels, each level is 20% of the failure load. Use the stacking method to load evenly from the middle to both ends for a total of five piles, with equal pile lengths and uniform gaps. After each level of loading, let it stand for 2 minutes, and record the total load when a through crack appears on the back of the plate as the test result. 3
Figure 7 Test of bending failure load by uniform load method 50
1-Loading brick code; 2-Bearing plate (100mm wide and 615mm thick steel plate); 3-A support (Q60mm steel column) 6.4.7 Impact strength test
Assemble and fix the lightweight partition wall as shown in Figure 8, the wall width is 1800mm, the center distance between the upper and lower steel pipes is (L-100)mm, the plate joints are bonded with cement water glass mortar, the plates are squeezed tightly, the joint grooves are connected with glass fiber cloth, and are smoothed with cement water glass mortar. After 1 day, fix the standard sandbag filled with 30kg fine sand with a particle size of less than 2mm as shown in Figure 9 on a steel ring with a center distance of 100mm from the plate surface by a rope with a diameter of 15mm. The rope length is (L-1650)mm. Pull the sandbag along the arc in a plane perpendicular to the plate surface with the rope length as the radius, raise its center of gravity by 500mm (measured by a ruler), and then swing it freely to impact the set position. Repeat three times, visually inspect whether there is a through crack on the back of the plate, and record the test results.
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Figure 8 Impact strength test method
1-Steel pipe (50mm) 2-Beam fastening device; 3-Fixed beam (10 hot-rolled equal-angle steel); 4-Fixed frame:
5-Partition wall specimen assembled with lightweight strips; 6-Standard sandbag, details as shown in Figure 9 7-Lifting rope (diameter 15mm); 8 Lifting ring (inner diameter 520mm)
Figure 9 Standard sandbag
1-Canvas, 2-Sand injection port, 3-Leather apple (thickness 6mm, width 40mm and length 70mm) Hanging force test
a. At a height of 2000mm in the plate, chisel a hole with a depth × length × width of 50mm×40mm×90mm, clean up the residual ash, and then use cement water glass slurry (or other adhesives) to bond the steel plate hanging parts shown in Figure 10. The distance between the hanging hole and the plate surface is 1b0mm. After 2h, check whether the hanging is firmly installed, otherwise reinstall it. Figure 10 Steel plate hanging
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bFix the strip board as shown in Figure 11, and the distance between the upper and lower steel pipes is (L-100)mm. cThrough the circular hole of the steel plate hanging, load in two stages, the first stage loads 400N, let it stand for 2min, then load 400N, let it stand for 24h, observe whether there are through cracks on the plate surface, and whether there is damage around the hanging area. Record the test results. Figure 11 Hanging force test method
1-Steel pipe (0.50mm); 2-Fixed beam (10# hot-rolled equal angle steel); 3-Fastening bolts 4-Steel plate hanging parts
7 Inspection rules
7.1 Inspection classification
7.1.1 Factory inspection
Products must be inspected before leaving the factory. The factory inspection items are all the provisions in Articles 5.2 and 5.4. Products can only leave the factory after passing the factory inspection.
7.1.2 Type test
Product type test conditions and test items are shown in Table 5. Table 5 Type test conditions and test items
Test conditions
(D When a new product is put into production for evaluation ($) When there are major changes in the material, formula, or process of the product, which may affect the product performance
(8) For continuously produced products, when the annual production is 35,000 pieces or more (4) When the product is stopped for more than half a year and then resumed (5) When the factory inspection results are significantly different from the previous type inspection results (6) When the user has special requirements
(7) When the national quality supervision and inspection agency proposes to conduct type inspection 7.2 Factory inspection and type inspection sampling method 7.2.1 Factory inspection sampling
Test items
All the provisions in Articles 5.2, 5.4 and 5.5
5.2, 5.4, 5.5. All provisions in Article 5
Article 5.2, 5.4, 5.5.1, 5.5.2, 5.5.6, 5.5.7, 5.5.8 Article 5.2, 5.4, 5.5.1, 5.5.2, 5.5.6, 5.5.7, 5.5.8 All provisions in Article 5.2, 5.4 and 5.5
Partial or all provisions in Article 5.2, 5.4, 5.5 All or part of provisions in Article 5.2, 5.4, 5.5 The product factory inspection shall be carried out in accordance with the normal inspection twice sampling plan in GB2828 as shown in Table 6. 7.2.2 Sampling for type inspection
When the product is subjected to type inspection, samples shall be taken from the products that have passed the inspection of appearance quality and dimensional deviation items to test the physical and mechanical properties items. Take one piece (6) for each test item .4.2, 6.4.7 as a group) test pieces constitute the first sample. Take two (groups) of test pieces as the second sample for inspection.
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Batch Range
151~280
281~500
501~1200
1201~3200
321~10000
1000135000
Judgment Rules
Factory Inspection Judgment Rules
Table 6 Normal Inspection Two Sampling Plan
Sample Size
Qualified Judgment Number
Unqualified Judgment Number
According to the sample unit inspection results, if the appearance quality and size of the tested board are deviated If the difference meets the requirements of Articles 5.2 and 5.4, the board is judged to be a qualified board. If one or more of the appearance quality and dimensional deviation of the tested board does not meet the requirements of Articles 5.2 and 5.4, the board is judged to be a non-conforming board.
According to the sample inspection results, if the number of non-conforming boards (u1) found in the first sample (n1) is less than or equal to the first qualified judgment number (A,) in Table 6, the batch is judged to be a qualified batch. If the number of non-conforming boards (u) found in the first sample (ni) is greater than or equal to the first non-conforming judgment number (R) in Table 6, the batch is judged to be a non-conforming batch. If the number of non-conforming boards (u1) found in the first sample (n,) is greater than the first qualified judgment number (At) and less than the first non-conforming judgment number (R), the second sample (n2) is selected for inspection. If the sum of the number of non-conforming boards found in the first and second samples (u+u2) is less than or equal to the second qualified judgment number (A2), the batch is judged to be a qualified batch. If the sum of the number of unqualified boards found in the first and second samples (u1 + u2) is greater than or equal to the second unqualified determination number (R2), the batch is judged to be an unqualified batch. The judgment results are shown in Table 7. Table 7 Judgment results
u≥R1
Aiu
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