Some standard content:
National Standard of the People's Republic of China
Autoclaved acraled concrete slabs
Autoclaved acraled concrete slabs1Subject content and applicable model drawings
GB 15762-1995
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, storage, packaging, transportation, product quality certificate, etc. of autoclaved aerated concrete slabs.
This standard applies to autoclaved aerated concrete roof slabs and self-supporting reinforced wall slabs (hereinafter referred to as roof slabs and wall slabs, and the two are collectively referred to as slabs) used in civil and industrial buildings. 2 Reference standards Hot-rolled ribbed steel bars for reinforced concrete GB1499 GI6763 GB 9196 GB 11968 Standard for the limit of radioactive substances in industrial waste residues for building materials Standard for the control of radioactive substances in industrial waste building materials Autoclaved aerated concrete blocks GB/T 11969 GB/T 11970 GB/T 11971 General principles for test methods for properties of aerated concrete Test methods for bulk density, moisture content and water absorption of aerated concrete Test methods for mechanical properties of aerated concrete Test methods for drying shrinkage of aerated concrete GH/T 11972 G13/T 11973
3 Product classification
Test method for frost resistance of aerated concrete
3.1 Types and specifications
3.1.1 The specifications of the roof panel are shown in Table 1, and its appearance is shown in Figure 1. The two sides of the roof panel should be equipped with embedded parts according to the design requirements. The size of the groove should comply with the provisions of Table 1.
Product nominal size
Virtual panel
1 800-- 000
Approved by the State Council Technical Supervision Department on November 30, 1995
Product size
Width d
Applied on August 1, 1996
Note: The shape and position of the groove are determined according to the design. GB 15762 --1995
Schematic diagram of the appearance of the cabinet tail surface
3.1.2 The specifications of the wall panels are shown in Table 2. Its appearance is shown in Figures 2, 3 and 4. Table 2
Nominal dimensions of products
Exterior wall panel JQB
Partition panel JGB
1500--6000
According to design requirements
Vertical: L
Horizontal: 1.-20
According to bucket requirements
Figure 2 Schematic diagram of the appearance of vertical exterior wall panel
Product manufacturing dimensions
Unit: mm
Width d
Unit: mm
GH 15762—1995
Figure 3 Schematic diagram of the appearance of horizontal exterior wall panel
Figure 4 Schematic diagram of the appearance of partition panel
3.1.3 If the ordering unit requires other specifications, it can be determined through consultation with the manufacturer. 3.2 Grades
3.2.1 The boards are divided into 05, 06, 07, and 08 grades according to the dry volume density of aerated concrete. 3.2.2 The boards are divided into three screening grades according to the allowable size deviation and appearance: superior products (A), first-class products (B) and qualified products (C). 3.3 Product marking example
Roof panels are marked with code, grade, standard load, nominal size (length × thickness) and grade sequence. For example, the roof panel with grade 06, standard load of 1500kN/m2, nominal size length of 4800mm and thickness of 175mm is superior product:
JWB0615004800X175AGB15762--1995Wall panels are marked with code, grade, nominal size (length × thickness) and grade order: for example: grade 05. Nominal size length 6000mm, thickness 120mm superior quality plate, JGB056000X120AGB15762—1995
4 Technical requirements
4.1 Basic properties of materials
GB15762—1995
4.1.1 When using industrial waste residue as raw material, it shall comply with the provisions of GB6763 and GB9196. 4.1.2 The performance of pressurized aerated mixture shall comply with the provisions of GH11968. 4.1.3 The steel bars shall comply with the provisions of GB1499 Grade 8 steel. 4.1.4 The corrosion resistance of the steel coating shall be Grade 8. 4.1.5 For Grade 05.06 plates, the adhesion of the steel bars in the plates shall be ≥ 0.8MPa (the minimum adhesion of a single bar shall not be less than 0.5MPa), and for Grade 07 and 08 plates, the adhesion of the steel bars in the plates shall be ≥ 1.CMPa (the minimum adhesion of a single bar shall not be less than 0.5MPa). 4.2 The allowable deviation of the size and appearance of the plates shall comply with the provisions of Table 3. Table 3
Steel protective layer
Length!
Width
Basic size
According to the production size
According to the production size
According to the production scale
Surface smoothness
Exposure, corner loss, side damage, large surface damage
Injury, end turn-over
Superior products (A)
L/1000
Not allowed
Qualified products (B>
L:/600
Not allowed
Qualified products (C)
L:/750
La1500
Not allowed||t t||4.3 The boards of grade 05 and grade 06 shall not have cracks: the qualified roof panels shall not have through cracks and other cracks that affect the structural performance, and shall not have longitudinal cracks with a length of 260Gmm and a width of ≥0.2mm. The number of other cracks shall not exceed 2; the qualified wall panels shall not have through cracks, and the length and width of other cracks are not limited, and the number shall not exceed 3. 4.4 The reinforcement protection layer of the board shall be measured from the outer edge of the steel bar and shall comply with the provisions of Table 3, see Figure 6. 4.5 The board is allowed to be repaired when the following conditions are met. For grade 05 and 06 boards, the compressive strength of the repair material is 5.0MP a. For 07 and 08 grade plates, the compressive strength of the repair material is 2&.0MPa. After the repair is complete, the plate is inspected and qualified and can be shipped as a qualified product. Corner drop: the dimension a in the width direction of the plate is ≤150mm, the dimension in the length direction of the plate is 300mm, see Figure 7a
b. Side damage: the total length is 6≤500mm, the depth a does not exceed the main reinforcement protection layer, see Figure 8t. Large damage: area ≤200cm2, depth a≤10mm, there is 1 place for plates with a length of L≤3300mm, and there are at least F or equal to 2 places for plates with a length of L>3300mm, see Figure 9.
GB 15762—1995
Figure 5 Schematic diagram of dimension measurement position
Figure 6 Schematic diagram of steel bar protection layer
-Main protection layer: 6-End protection layer
Figure Schematic diagram of corner drop
2—Plate width force direction: 6—Plate length direction
Unit: mm
GB 157621995
Figure 8 Schematic diagram of side damage
α--Depth is—-Length
Figure 9 Schematic diagram of large surface damage and end turnaround
α…·Depth of large surface damage; Depth of end turnaround End turnaround (including sparse skin): width hs25mm.1, see Figure 9, the width of the board that is not high enough: width ≥585mm, length ≤board length%: when the width <585mm, it meets the situation of side damage:
The board groove size does not meet the standards
4.6 The structural performance of the roof panel shall meet the following requirements;.
The material strength and construction requirements shall comply with the requirements of the design drawings. Measured value of bearing capacity test coefficient:
Wherein: r
Measured value of roof panel bearing capacity test coefficient, i.e., the ratio of the measured load value to the load design value (including self-weight) when the test reaches one of the test signs of failure listed in Table 4; Importance coefficient, based on the structural safety level, the allowable value of roof panel bearing capacity test coefficient is selected from the table, selected according to Table 4: · Roof panel resistance partial coefficient, adopts 0.75. Note: Load design refers to the measured value of short-term deflection under the load value corresponding to the combination of the ultimate bearing capacity state effect:
a.≤ M(@-1) +M,ce
wherein, α is the measured value of short-term deflection of the roof panel under the short-term combination of loads; M is the bending moment value calculated according to the short-term combination of loads, (2)
GB 15762-1995
M. The bending moment value calculated according to the long-term combination of loads: - Considering the influence coefficient of the long-term combination of loads on the increase of the beam, the coefficient is 2.0 [ar] - The allowable deflection value of the roof panel is 1/200 of the span of the board (L.). d
Under the standard load acting in the short term, no new cracks should appear. The standard load is proposed by the design units in each region and determined by the relevant management departments. e.
Structural design stress conditions
Shear strength of penetrated members
Safety level of structure
5 Test methods
Inspection signs of damage
The maximum crack depth before tension reaches 1.5mm, or the crack depth reaches 1/50 of the span; the aerated concrete in compression is damaged
The main tensile reinforcement is broken
The material joint of the adhesive part reaches 1.5, or the aerated concrete in the end of the inclined reinforcement is sheared along the inclined drum surface, the air concrete is damaged in inclined compression, or the main tensile reinforcement is detached at the end, or other damage occurs
5.1 Basic properties of materials
5.1.1 Radioactivity determination shall be carried out in accordance with the provisions of GB6566, GR6763 and GB9196. 5.1.2 The performance test of autoclaved aerated concrete shall be carried out in accordance with the provisions of GB/T1195911973. 5.1.3 The anti-rust ability test of the steel bar layer shall be carried out in accordance with the provisions of Appendix A (reference) of this standard. 5.1.4 The adhesion test of steel bars in the plate shall be carried out in accordance with the provisions of Appendix 1 (reference) of this standard. 5.2 Specifications, dimensions and allowable deviations of the scale The dimensions of the plate shall be tested with a steel ruler and a saw tape (minimum scale 1mm). Length, width, thickness, height and groove width are measured at both ends and the top of the plate, and three dimensions are measured for each (see Figure 5), accurate to 1mm. The maximum deviation is used for judgment.
5.3 Appearance
5.3.1 Tools: copper ruler and steel tape measure (minimum scale 1mm), 2 rulers, tree-shaped feeler gauge, reading magnifying glass (minimum scale 0.05mm): 5.3.2
Use wire and steel ruler to check the maximum part of lateral bending, accurate to 1mm. 5.3.3 Use steel ruler to measure the difference between two diagonals, accurate to 1mm. 5.3.4 Use 2m ruler and wedge-shaped feeler gauge to check the surface flatness at 2 places - accurate to 1mm, and the larger value is used for judgment. Exposed tendons, corner drop, side view, large surface loss, and end turn are measured by visual inspection and measuring tools. 5.3.5
5.3.6 The length of the crack chain is measured with a steel ruler, accurate to 1mm. The width of the crack chain is measured with a reading magnifying glass, accurate to 0.05mm. 5.4 The thickness of the protective layer of the steel bar can be measured directly with a measuring tool or with a steel bar detector at the two ends and three places in the middle of the plate, accurate to 1mm. The maximum value is used for judgment:
5.5 Structural performance of roof panels
The structural performance inspection of roof panels shall be carried out in accordance with the provisions of the Appendix (reference) of this standard. 6 Inspection rules
6.1 Type inspection
GB 15762---1995
6.1.1 When one of the following conditions occurs: Type inspection B, trial production and identification of new products or old products transferred to the factory: After formal production, when the raw materials, process, etc. of the product are greatly changed, which may affect the performance of the product: During normal production, the inspection should be carried out at least once every six months: c. When the product is stopped for 3 months and production is resumed; d. When the inspection results are significantly different from the European type inspection; f. When the national quality inspection agency proposes the requirement for type inspection. 6.1.2 Type inspection items include: the performance of aerated concrete (cubic compressive strength, dry volume density, dry shrinkage value, frost resistance), anti-rust ability of steel bar layer, steel bar adhesion, size, appearance, steel bar protective layer, and structural performance of the box plate. 6.1.3 Among the products to be inspected, 3 boards are randomly selected to make 3 groups of cubic compressive strength test pieces, 3 groups of dry volume density test pieces, 3 groups of dry shrinkage test pieces, and 3 groups of frost resistance test pieces, and various tests are carried out. When the results of each of the 3 groups of tests meet the requirements of GB11968, the performance of the aerated concrete of the product is judged to be qualified: if 1 group does not meet the requirements, the product is judged to be unqualified. 6.1.4 Randomly select 3 plates from the products to be inspected (plates in 6.1.3 may also be used) and make 3 groups of steel bar coating anti-rust performance test pieces and 3 groups of steel bar adhesion test pieces for this network test. If the test results of each of the 3 groups meet the requirements of 4.1.4, 4.1.5, the steel bar coating anti-rust performance and steel bar adhesion of the product are determined to be qualified; if 1 group does not meet the requirements, the product is determined to be unqualified. 6.1.5 Randomly select 75 plates from the products to be inspected and conduct dimensional inspection. If only 4 or less than 4 plates do not meet the requirements of the corresponding grade in Table 3, the product size is determined to meet the grade; if more than 4 plates do not meet the requirements, the product is determined to be unqualified. 6.1.6 For the above 75 panels, conduct appearance inspection. When exposed reinforcement, U-turn, side damage, large surface damage, end U-turn and seam all meet the requirements of Table 3 and 4.3 of the corresponding grade, and only 4 or less panels do not meet the requirements of lateral bending, diagonal difference and surface flatness in Table 3, the product appearance quality is judged to meet the grade. When exposed reinforcement, U-turn, side damage, large surface damage, end U-turn and cracks of 5 panels do not meet the requirements, or more than 4 panels do not meet the requirements of lateral bending, diagonal difference and surface flatness, the product is judged to be unqualified.
6.1.7 Randomly select 5 panels from the panels that have passed the size and appearance inspections for steel bar protection layer and roof panel structural performance inspections. If all of them meet the requirements of Table 3, the product structural performance and steel bar protection layer inspections are judged to be qualified. If 1 panel does not meet the requirements, the product is judged to be unqualified.
6.1.8 In the type inspection, if all the inspection items of the inspected product meet the requirements of the corresponding grade, the inspected product is judged to meet the requirements of the grade. 6.2 Factory inspection
6.2.1 When the product is compared with the factory, the factory inspection is carried out. 6.2.2 The factory inspection items include: the cubic compressive strength, volume density, size, appearance, steel protection layer, and roof panel structural performance of the aerated concrete.
6.2.3 For the same specification of boards, 1000 pieces are used as a batch. If less than 1000 pieces are used, they are also counted as one batch. 6.2.4 Take samples from the board or take samples from the turned blocks made under the same conditions as this batch of boards to make 3 groups of test pieces for the cubic compressive strength and volume density of the aerated concrete. If it meets the requirements of G1311968, the cubic compressive strength and volume density of the aerated concrete of this batch of boards are judged to be qualified. Otherwise, the batch of boards is judged to be unqualified. 5.2.5 Fifty boards are randomly selected from each batch for size inspection. If the number of boards that do not meet the requirements of superior products in Table 3 does not exceed ←, the size of the board batch is judged to be superior products. If the number of boards that do not meet the requirements of first-class products in Table 3 does not exceed 4, the size of the board batch is judged to be -grade products. If the number of boards that do not meet the requirements of qualified products in Table 3 does not exceed 4, the size of the board batch is judged to be qualified products. If the number of boards that do not meet the requirements of qualified products in Table 3 is more than 4, the batch of products is judged to be unqualified.
6.2.6 For the above 50 plates, the lateral bending, diagonal difference and surface flatness inspections shall be carried out. If no more than 4 plates fail to meet the requirements of the superior products in Table 3, the batch of plates shall be judged as superior products in terms of lateral bending, diagonal difference and surface flatness. If no more than 4 plates fail to meet the requirements of the first-class products in Table 3, the batch of plates shall be judged as first-class products in terms of lateral bending, diagonal difference and surface flatness. If more than 4 plates fail to meet the requirements of Table 3, the batch of plates shall be judged as unqualified.
6.2.7 The exposed reinforcement, corner drop, side damage, large surface damage, end turn and crack inspections shall be carried out piece by piece, and all shall meet the requirements of Table 3 and 4.3.
6.2.8 From each batch of plates that pass the dimensional and appearance inspections, 3 plates shall be randomly selected to inspect the reinforcement protection layer and roof panel structural performance of the plates. If all of them meet the requirements, the steel bar protection layer and roof panel structural performance of this batch of panels are qualified; if one piece or one item does not meet the requirements, the batch of panels is judged to be unqualified.
6.2.9 During the factory inspection, if all items of the inspected products meet the requirements of the corresponding grade, the batch of products is judged to meet the grade. 6.2.10 If the purchase order has any objection to the factory inspection results of the products, it can entrust the product quality supervision and inspection agency to conduct a re-inspection together with the manufacturer. The re-inspection items can be all items listed in this standard, or some items can be suspended. The appearance quality inspection of the panels should be carried out at the delivery location. 7 Marking, storage, packaging, transportation
7.1 The products shipped should have a product quality certificate. On one side of each panel, there should be a trademark (or factory name) product mark, the direction of use of the panel, the production period and other marks.
7.2 The panels should be stored in the factory for more than 5 days before they can be shipped. 7.3 The virtual panels should be laid flat in the direction of use. The stacking method is shown in Figure 10. Wall panels should be placed sideways, and the stacking site should be solid, flat and dry. The panels should not directly touch the ground when stacking. The stack height (IF1) of roof panels should be within 1.5m, and pads should be placed between stacks. The total stacking height (H1) in the factory should not be greater than 6.5m. Rainproof measures should be taken when storing in the open air. 1
Single; mm
Figure 10 Schematic diagram of roof panel stacking method
H1, one stack height 1l, total height, 1 board + 2-100mm×100mm square pads 7.4. Plates need special tools for transportation and loading and unloading, and should be tied or packaged for transportation. 8. Product quality certificate
Product quality certificate must be provided when the product leaves the factory. Its contents include: a.
Product name;
Batch number:
Product mark:
Product performance test results:
Manufacturer name;
Product trademark: wwW.bzxz.Net
Signature and seal of the inspection department and the inspection personnel:
Factory date.
GE15762—1995
Test method for anti-rust performance of steel bar coating in autoclaved aerated concrete Warm and fast test method (reference part)
This method is suitable for quickly determining the anti-rust ability of steel bar anti-corrosion coating in autoclaved aerated concrete. A1. Instruments and equipment
Thermostatic and humidifying box, hammer, scraper.
42 Test specimens
A2.1 From the autoclaved aerated concrete slab, a specimen with a central steel bar is sawed longitudinally along the steel bar. A2.2 The specimen size is 40mm×40mm×160mm, and each 3 pieces are a group. A2.3 Before the test, the ends of the specimens are painted with epoxy resin or other coatings to completely seal the ends of the steel bars in the specimens to prevent the ends from rusting. A3 Test steps
A3.1 Place a group of 3 specimens in a temperature-adjusting mixing box and change the system according to Table A. 43.2 After 28 days and 112 cycles, open the specimen, scrape off the coating to check the surface rust of the steel bars, and compare it with the rust grade chart to determine the rust resistance of the coating.
A4 Result evaluation
From 25 to 55
From 55 to 25
Relative moisture corrosion
Duration
A4.1 Compare the three specimens with the steel bar corrosion grade chart, and take the lowest grade as the anti-rust grade of this steel bar coating. The steel bar corrosion grade chart is shown in Figures A1~A10 (the steel bar corrosion grade standard is printed in real size according to the Swedish standard SIS185111 anti-corrosion coating corrosion grade chart, and the pattern is a photo taken of the anti-corrosion performance of an oily self-drying anti-corrosion coating). A4.2 Rust resistance: ReC~Re9, Re0 is completely rust-free, and Re9 is completely rusted on the entire cut surface. A4.3 Anti-rust ability of coating: (level means the whole surface is completely rusted, @ level means no rust at all, 31
GB 15762-1995
Figure A1 Level 1
Figure A2 Level 2
G 15762-1995
Figure A3 Level 3
Figure A4 Level 4
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.