Some standard content:
National Standard of the People's Republic of China
Ferrocement ribbed slab
Subject content and scope of application
GB16308—1996
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, and stacking and transportation of ferrocement slabs. This standard applies to ferrocement roof panels and floor slabs for industrial and civil housing construction. Wire mesh cement wall panels can also be used as a reference. 2 Reference standards
GB 175
GB1344
GB1499
GB 7695
Portland cement, ordinary Portland cement
High slag slag Portland cement, pozzolanic Portland cement and fly ash Portland cement Hot-rolled ribbed steel bars for reinforced concrete
Wire mesh cement agricultural ship
GB 7897. 3
GB8076
GB 13013
Mechanical properties test method of mortar for wire mesh cement Compression strength test Concrete admixtures
Hot-rolled round steel bars for reinforced concrete
Sand for construction
GB/T 14684
GBJ9 Code for Loads on Building Structures
GBJ107
Standard for Inspection and Assessment of Concrete Strength
GBJ321 Standard for Inspection and Assessment of Quality of Precast Concrete ComponentsJGJ19 Specification for Design and Construction of Small and Medium-sized Components of Cold-drawn Low-carbon Steel Wire Prestressed Concrete3 Product Classification
3.1 Classification
Steel cement panels are divided into two categories according to their use: steel cement roof panels and steel cement floor panels. 3.2 Levels
3.2.1 Steel cement roof panels are divided into six levels according to live loads and dead loads, as shown in Table 1. Table 1
Steel cement floor panels are divided into five levels according to live loads. See Table 2. 3.2.2
Approved by the State Administration of Technical Supervision on May 15, 1996 268
Implemented on December 1, 1996
3.3 Grades
GB16308—1996
Steel cement board is divided into first-class product (B) and qualified product (C) according to appearance quality. 3.4 Specifications
The appearance of steel cement board is shown in Figure 1.
3.4.2 Structural dimensions
3.4.2.1 The structural dimensions of steel cement roofing board are shown in Table 3. Table 3
Nominal size
2 000×2 000
2121×2121
2500×2500
2828×2828
3000×300 0
3500×3500
3536×3536
4000×4000
length x width
1 980×1 980
2101×2101
2480×2480
2808×2808
2980×2980
3480×3480
3516×3516
3980×3980| | tt | 140
140, 160
140, 160
160, 180
160, 180
180, 200
Auxiliary width(6)
Side rib width(b）
32~~35
Middle rib width(b,）
16, 18
18, 20
18, 20
18, 20
18, 20
18, 20
3.4.2.2 The dimensions of steel mesh cement floor slab are shown in Table 4. Nominal size
3300X5000
3300×4800
3 300X1 240
3850X4450
Length×width
3270×4970
3270×4770
3270X1210
3820×4420
GB 16308-1996
3.5 Code
3.5.1 Examples of steel mesh cement roof panel codes are as follows: GSWB
Middle rib height
160, 200
160, 200
GB16308
Rib width (6)
Edge rib width (bh)
32～35||t t||32～35
Standard number
Roof panel grade
Roof panel grade (in N/m2)
Roof panel height (in mm)
Nominal width of roof panel (in mm)
Nominal length of roof panel (in mm)
Ferrocement roof panel
The following are examples of ferrocement floor slab codes. 4800
GB16308
Standard number
Floor grade
Floor grade (in N/m2)
Floor height (in mm)
Nominal width of floor (in mm)
Nominal length of floor (in mm)
Wire mesh cement floor
4 Technical requirements
4.1 Raw materialsbzxZ.net
Middle rib width (b)
18, 20, 22
18.20, 22
18, 20, 22
4.1.1 Cement
Ordinary Portland cement and slag Portland cement with a grade not less than 425 that conforms to GB175 and GB1344 should be used. 270
4. 1.2 Sand
GB163081996
Natural sand with a fineness modulus of 2.0~3.5 should be used, and the maximum particle size should not exceed 4mm. The mud content of sand should not exceed 2%, the mica content should not exceed 0.5%, and other quality requirements should comply with the relevant provisions of GB/T14684.
4.1.3 Mixing water
Drinkable fresh water should be used for mixing cement mortar. It is strictly forbidden to use dirty river water, sea water, domestic or industrial wastewater. 4.1.4 Admixture
Low air entrainment type high-efficiency water reducer should be used, and other admixtures can also be used. The technical conditions of admixtures should comply with the relevant provisions of GB8076, and chloride salts should not be mixed as early strength and antifreeze agents. 4.1.5 Steel bars, steel wires, and steel meshes
The rib steel bars should be Grade I steel bars in accordance with GB1499, and the structural bars should be Grade 1 steel bars in accordance with GB13013. The technical conditions of cold-drawn low-carbon steel wires should comply with the relevant provisions of JGJ19. The steel mesh should generally be a cold-drawn low-carbon steel wire woven mesh with a diameter of 0.9-1.0 mm and a mesh size of 10 mm × 10 mm. Steel meshes of other specifications may also be used, but the mesh diameter shall not be greater than 2 mm, the mesh size shall not be greater than 50 mm × 50 mm, and the tensile strength of the steel wire shall not be less than 450 MPa.
4.2 Mortar strength
4.2.1 The standard value of the compressive strength of the mortar for steel mesh cement board shall meet the design requirements. If no requirements are put forward in the design, it shall not be less than 40 MPa. 4.2.2 The mortar strength of the steel mesh cement board when it is hoisted and shipped out of the factory shall not be less than 75% of the standard value of the mortar compressive strength. 4.3 Construction requirements
The thickness of the mortar protective layer of the steel mesh cement roof and floor surface shall not be less than 3mm, and the thickness of the mortar protective layer of the rib shall not be less than 4.3.1
5mm.
The lap length of the wire mesh shall not be less than 50mm on the smooth edge and not less than 80mm on the rough edge. 4.3.2
4.3.3 The arrangement of the stress-bearing steel bars in the ribs of the steel mesh cement board shall not exceed two rows of steel bars. The net distance shall not be less than the diameter of the steel bar and shall not be less than 10mm. 4.3:4 The diameter of the panel reinforcement of the steel mesh cement roof and floor and the diameter of the stirrups of the ribs shall not be less than 2.6mm. The spacing shall not be greater than 200 mm.
4.4 Appearance quality
The appearance quality of the steel wire cement board shall comply with the requirements of Table 5. Item
First-class products
Exposed reinforcement and mesh
No part
No part
No part
Quality requirements
Qualified products
(1) Main reinforcement and bottom of the board shall not have
(2) Other parts shall not have
After renovation, there shall be
If there are a few holes, they must be repaired
The total area shall not exceed 1% of the area, and each part shall not exceed 100cm2 (1) The main reinforcement parts at the bottom of the board, four corners and ribs shall not have a width greater than any There should be no cracks with a width greater than 0.05mm in any part. (2) There should be no cracks with a width greater than 0.1mm in the board surface and ribs other than the main reinforcement. Connection parts. Appearance defects. Surface defects. Surface stains. 4.5 Dimensional deviation. First-class products. There should be no cracks with a width greater than 0.05mm. GB 16308-1996
Continued Table 5
Quality requirements
Qualified products
(1) There should be no looseness at the rib ends;
(2) There should be no other defects after repair
No missing edges or corners after repair
The total area of the rough surface shall not exceed 5% of the area, and each area shall not exceed 300cm2
After treatment, there shall be no oil stains or debris on the surface
The allowable size deviation of the wire mesh cement board shall comply with the provisions of Table 6. Table 6
Embedded parts
4.6 Mechanical properties
Rib height, rib width
Panel thickness
Lateral bending
Panel surface flatness
Main reinforcement protection layer thickness
Diagonal difference
Center position deviation
Smoothness with mortar surface
4.6.1 The bearing capacity of steel mesh cement board shall comply with the requirements of formula (1) y≥y.fy
Where: -
Allowable size deviation
Measured value of steel mesh cement board bearing capacity test coefficient. That is, the ratio of the measured value of the bearing capacity test load of the specimen to the design value of the bearing capacity test load (including self-weight): -Structural importance coefficient. Take it when no requirements are made in the design.一1; [.] - The allowable value of the inspection coefficient of the steel mesh cement board is taken according to Table 7. 4.6.2 The deflection of the steel mesh cement board shall comply with the requirements of formula (2). α［a]
Where: α'-
The actual measured value of the short-term deflection of the steel mesh cement board in the span under the normal short-term load inspection value. mm; The allowable value of short-term deflection. It is converted from the design allowable deflection value. When the design does not make any requirements, take [a, 一L/300, 1 is the strength of the steel mesh cement board,
GB16308-1996
4.6.3 The cracks of the steel mesh cement board shall comply with the requirements of formula (3) Wmsx[Wmax]
Where: Wgmax--The actual measured value of the maximum crack width under the normal short-term load inspection value, mm, (3)
[Wmx]--The maximum allowable crack width of the steel mesh cement board inspection. When no requirement is put forward in the design, [Wmx] is taken as 0.05mm. Table 7
Testing signs of steel wire mesh cement board reaching the bearing capacity limit The maximum crack width at the tension main reinforcement reaches 1.5mm, or the deflection reaches 1/50 of the avoidance Mortar failure in the compression area, at which time the maximum crack width at the tension main reinforcement is less than 1.5mm and the deflection is less than 1/5 of the span Tensile main reinforcement is pulled apart
The oblique crack at the adhesive part reaches 1.5mm, or the end of the oblique crack Shear failure of the compression mortar Oblique compression failure of the mortar along the oblique section, the tension main reinforcement slips at the end, or other anchor surface failure 5 Test method
5.1 Mortar strength
Mortar strength test shall be carried out in accordance with GB7897.3. 5.2 Appearance quality
5.2.1 Exposed reinforcement, exposed mesh, holes and appearance defects shall be observed by naked eyes and measured with measuring tools. 5.2.2 Honeycombs, surface defects, and surface stains shall be observed with the naked eye and measured with measuring tools and a hundred-grid. 5.2.3 Cracks shall be observed with the naked eye and measured with a 20x reading microscope. 5.3 Dimensional deviation
shall be carried out in accordance with the relevant provisions of GBJ321.
5.4 Mechanical properties
shall be carried out in accordance with the relevant provisions of GBJ321.
6 Inspection rules
6.7 Inspection classification
The inspection of steel mesh cement board is divided into factory inspection and type inspection. 6.1.1 Factory inspection includes mortar strength, appearance quality, dimensional deviation and mechanical property inspection, and each item shall be inspected according to the specified value. 6.1.2 Type inspection includes mortar strength, appearance quality, dimensional deviation and mechanical property inspection. In addition to the inspection of each item according to the specified value, when the design requires the inspection according to the calculated value of the mechanical property determined by the actual reinforcement of the steel mesh cement board, the mechanical property shall still be inspected according to the calculated value. 6.1.3 One of the following situations occurs. Type inspection is required: a.
When a new product is put into production;
After formal production. If there are major changes in structure, materials, and processes that may affect product performance; during normal production, a periodic type inspection is required once a year; when the product is stopped for a long time and production is resumed, when the factory inspection results are significantly different from the last type inspection; e.
f. When the national quality supervision agency proposes a type inspection requirement. 6.2 Sampling and batching rules
6.2.1 Batch
Products of the same process and the same specification are considered as a batch. If they are less than 1,000 pieces, they can also be considered as a batch. 6.2.2 Bundle sampling
GB16308-1996
Randomly select 5% (not less than 10 pieces) from a batch, and the test pieces are inspected for appearance quality and dimensional deviation. From the above qualified test pieces, ~ pieces are selected for mechanical property test. At least 3 groups of mortar test pieces are formed in each batch, one group is used to test the design strength of the mortar; the other two groups are used to test the demoulding strength and factory strength. 6.3 Judgment rules
6.3.1 Mortar strength
The mortar strength assessment shall comply with the provisions of GBJ107. 6.3.2 Appearance quality and dimensional deviation
6.3.2.1 The appearance quality and dimensional deviation of the steel mesh cement board shall be determined according to Table 5 and Table 6 respectively. 6.3.2.2 The qualified point rate of appearance quality and dimensional deviation shall be carried out according to Article 6.07 and Article 6.08 of GBJ321 respectively. When the qualified point rate is greater than or equal to 70%, the appearance quality and dimensional deviation of the batch of products are judged to be qualified. 6.3.3 Mechanical properties
When the mechanical property test results of the steel mesh cement board meet the requirements of Article 4.6, the mechanical properties of the batch of products are judged to be qualified. 6.3.4 General judgment
When the appearance quality, geometric dimensions and mechanical properties of the steel mesh cement board are all qualified, the batch of products is judged as "qualified products". On the basis of qualification, when the appearance quality of the products meets the quality requirements of first-class products in Table 5, the products that meet the requirements are "first-class products". 7 Marking, stacking and transportation
7.1 Marking
Steel mesh cement boards must be marked with the factory name (factory mark), product code, production date (year, month, day), production team and inspection stamp. 7.2 Product certificate
All products that have passed the inspection and are allowed to leave the factory should be filled with product certificates. The contents include: a.
Batch number:
Factory name (factory logo) and production date (year, month, day); product code;
Product quantity;
Appearance quality and dimensional deviation test results; mortar strength;
Mechanical property test results;
Quality inspection department signature.
7.3 Stacking
7.3.1 Steel mesh cement board should be stacked according to classification, specification, grade and production date. 7.3.2 The stacking site should be solid and flat, and the stacking height should be determined according to the dead weight and strength of the steel mesh cement board, the ground bearing capacity, the strength of the pads and the stability of the stacking. The number of stacking layers should generally not exceed six layers. 7.3.3·When stacking, the four corners of each board must be stably placed with pads between them. Twisting is strictly prohibited. The pads at each corner between each layer should be on a vertical line. ：
7.4 Transportation
7.4.1 The support position and method of the steel mesh cement board during transportation should not cause excessive stress on the mortar and damage to the board. 7.4.2 Lift and transport with care and avoid collision. 274
Additional Notes:
GB16308-1996
This standard was proposed by the State Administration of Building Materials Industry. This standard is under the jurisdiction of the National Technical Committee for Standardization of Cement Products. This standard was drafted by the Suzhou Concrete Cement Products Research Institute of the State Administration of Building Materials Industry. The main drafters of this standard are Wang Xizhe and Qian Ming. This standard is entrusted to the Suzhou Concrete Cement Products Research Institute of the State Administration of Building Materials Industry for interpretation. 275
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