CN203174864U - Autoclaved aerated concrete block - Google Patents

Abstract

An autoclaved aerated concrete block, which is characterized in that 2 to 4 rows of flat strip-shaped vertical blind holes are opened downward along the upper surface of the block, the hole width is 16mm to 18mm, and the distance between the bottom of the blind hole and the The distance between the bottom plane of the block body is 10±0.5mm; 1≤the number of blind holes on each row≤4, the distance between blind holes and blind holes and the width of the thermal bridge must be greater than 30mm, and the distance between two rows of blind holes must be ≥30mm and ≤60mm The side ribs at the two ends of the block body along the length direction shall not be less than 30mm, and the side ribs on both sides along the width direction shall not be less than 40mm; the core hole ratio of the autoclaved aerated concrete block shall not exceed 24.0%.

Description

Autoclaved aerated concrete block

technical field

This proposal relates to a concrete block, in particular to an autoclaved aerated concrete block.

Background technique

At present, the types of domestic self-insulating blocks are divided into: 1. Concrete self-insulating blocks, light aggregate concrete self-insulating blocks. This type of block is filled with high-efficiency thermal insulation materials in the holes of concrete blocks, such as: XPS, EPS, PU, PF, urea-formaldehyde and other combustible materials, which have poor fire resistance. There are also forms such as filling perlite, vitrified microbeads and other insulating materials or pouring foamed cement. This type of thermal performance is poor. The production methods are pouring and molding. Natural curing is generally used, and atmospheric pressure steam is also used. maintenance. The thermal resistance of this type of block insulation performance index is 1.0-2.2 (m2 K)/W, and the porosity is greater than 45%, while the porosity of this scheme is less than 25% (volume calculation method). The utilization factor of its compressive strength (masonry) is only 0.2 to 0.3, while the product strength utilization factor of this scheme is high, which can reach more than 0.6. Due to its natural curing, the drying shrinkage value is large, and the high moisture content (greater than 10%) leads to unstable thermal performance. The forming method of this type of thermal insulation block determines that the hole size is large, and the minimum width of the hole is greater than 20 mm. No matter how small the hole width is, the shape cannot be formed, because the pull-out resistance of the mold core is too large, and the structure will be destroyed when pulled out. Then there is the high cost of this kind of insulation cutting, and the cost is about 400 yuan per cubic meter.

2. Autoclaved aerated concrete blocks. This kind of thermal insulation block has unstable thermal performance due to its solid body and high moisture content. The thermal resistance of a wall with a thickness of 240 mm is generally less than 1.4 (m2·K)/W, which does not meet the requirements of the current energy-saving standards. But the cost is low. Its production method is foam molding-cutting-high pressure steaming method. It is a mature wall material in China.

3. Non-steamed foamed cement insulation blocks. This kind of thermal insulation block is made by adding foaming agent, modifier, water reducer, water, etc. to cement, pouring, foaming, cutting, and natural curing. Due to the unstable quality of natural maintenance and poor freeze-thaw resistance of this type of block, the thermal resistance of a 240 mm thick wall is generally less than 1.5 (m2 K)/W, and the cost is high, and the cost is not less than 320 yuan per cubic meter.

Chinese utility model patent 201020602891.5 relates to a concrete block, especially a high-efficiency and energy-saving autoclaved aerated concrete block with multiple rows of holes. The block includes a block body, and the block body is provided with at least three rows of vertical through holes or blind holes with a diameter of 8-15 mm along the height direction, and the distance between the blind holes and the bottom end surface of the block body is 2-2 mm. 3cm. One of the block bodies has a size of 600×300×200 mm, and has 3 to 4 rows of through holes or blind holes on it, and each row has 6 to 20 through holes or blind holes. Since the utility model provides a through hole or a blind hole on the block body, the distance between the blind hole and the bottom end face of the block body is only 2-3 cm, that is, the depth of the blind hole is very large, which further reduces the risk of autoclaved aerated concrete masonry. The thermal conductivity of the block improves its thermal insulation performance and has a higher energy-saving effect.

Contents of the invention

This scheme is based on high-performance autoclaved aerated concrete blocks, adopts unique processing technology, special blind hole structure and arrangement and combination to form high-performance self-insulating autoclaved aerated concrete blocks, which meet the requirements of low-energy green building standards.

An autoclaved aerated concrete block, which is characterized in that 2 to 4 rows of flat strip-shaped vertical blind holes are opened downward along the upper surface of the block, the hole width is 16 mm to 18 mm, and the distance between the bottom ends of the blind holes is The distance between the bottom plane of the block body is 10±0.5 mm; 1≤the number of blind holes on each row is ≤4, the distance between blind holes and blind holes must be greater than 30 mm, and the distance between two rows of blind holes must be ≥30 mm And ≤60 mm; the side ribs at the two ends of the block body along the length direction shall not be less than 30 mm, and the side ribs on both sides along the width direction shall not be less than 40 mm; the core hole ratio of autoclaved aerated concrete blocks shall not exceed 24.0%.

The specific feature of this program is that there are chamfers with a radius of 5 mm at the four corners of the end of the blind hole.

There are 4 rows of blind holes, two middle blind holes are arranged side by side in the first and third rows, and short blind holes, middle blind holes and short blind holes are arranged side by side in the second and fourth rows from left to right.

There are three rows of blind holes, two middle blind holes are arranged side by side in the first row and the third row, and long blind holes are arranged in the second row.

The beneficial effect of this scheme is: because the setting of the blind hole changes the path of heat conduction, reduces the heat transfer coefficient of the main body block and improves the thermal resistance of the block, and avoids the construction of the block by the block due to the reduction of the shrinkage value of the block. The common problem of cracking of the formed wall meets the production requirements.

There is no need to fill the blind holes with high-efficiency thermal insulation materials, and it is not necessary to pour foam materials or vitrified microbead insulation materials. The unique blind hole structure and precise size of the autoclaved aerated concrete block fully realize the thin The mortar joint masonry, the mortar joint is controlled at 2.5±0.5 mm, which greatly reduces the impact of the thermal bridge of the gray joint caused by the traditional masonry method, and ensures the effectiveness of the thermal performance of the wall. After the wall is reversed, all the blind holes in the block form a closed heat flow blocking structure in the wall. Due to the unique structure of this scheme and the special blind hole width, the heat radiation transfer in the hole is effectively controlled. The strength of heat transfer and convective heat transfer can greatly improve the thermal resistance of the block masonry, so that the energy-saving and thermal insulation effect can reach the best. Compared with the non-porous ordinary autoclaved aerated concrete block, the thermal resistance can be improved. double. The block masonry thermal resistance of the above-mentioned specifications and sizes is ≥2.60 (m ² ·K)/W, which is higher than the requirements for exterior walls in JGJ 26-2010 "Design Standards for Energy Conservation of Residential Buildings in Severe Cold and Cold Regions". The block structure is reasonable, the masonry strength utilization coefficient is high, which can reach more than 0.60 (ordinary blocks are generally 0.2-0.3), the physical and mechanical indicators are good, and the compressive strength is ≥ 3.5 MPa, which fully meets GB 50574-2010 "Wall Material Application Uniform Technical Specifications. The performance of fire prevention, heat preservation and heat insulation fully meets the design requirements of low energy consumption green buildings. The processing method of this scheme adopts recycling, has no waste and is environmentally friendly, and realizes clean production. Performance indicators of this program:

1. Compressive strength ≥3.5 MPa, in accordance with GB 4111-1997 "Inspection Method for Small Concrete Hollow Blocks";

2. Moisture content ≤ 6%, according to GB 11969-2008 "Test method for autoclaved aerated concrete"

3. Drying shrinkage value ≤0.60mm/m, according to GB 11969-2008 "Test method for autoclaved aerated concrete"

4. Density ≤ 580kg/m ^{3 ,} according to GB 11969-2008 "Test methods for autoclaved aerated concrete"

5. According to the volume calculation method, the porosity is ≤24%;

6. Masonry thermal resistance ≥2.60 (m ² ·K)/W, higher than the current national industry JGJ 26-2010 "Design Standards for Energy Conservation of Residential Buildings in Severe Cold and Cold Regions" for exterior walls, meeting the exterior walls of low-energy green buildings insulation requirements.

7. The sound insulation performance is greater than 50bd according to the method specified in GB/T 19889.3

Due to the special arrangement of hole types in this solution, the sound absorption effect is increased. Although the weight is lighter, the sound insulation effect is better.

8. Combustion classification Class A, fire resistance limit of more than 2 hours.

GB8624-2006 "Classification of Combustion Behavior of Building Materials and Products"

9. The product of this scheme has structural characteristics. When used in walls, the strength utilization coefficient can reach more than 0.60. The walls built with this product have high safety, which is beyond the reach of any other porous blocks.

10. The products of this scheme are completely made of inorganic materials, without high-efficiency organic thermal insulation materials (XPS, EPS, PU and other organic high-efficiency thermal insulation materials), to eliminate fire hazards and save petrochemical resources; the processing method of this scheme adopts clean production and recycling, and there is no waste Environmental protection is conducive to emission reduction; the product itself of this scheme is an energy-saving product, and the energy-saving effect is good.

Description of drawings

Fig. 1 is a schematic diagram of the distribution of four rows of blind holes on an autoclaved aerated concrete block (four rows of hole distribution scheme one); Fig. 2 is a left view of Fig. 1; Fig. 3 is a flow chart of the production method of an autoclaved aerated concrete block; Figure 4 is the relationship curve between blind hole width and heat group; the horizontal axis in the figure is the width of B hole, mm; the vertical axis is the thermal resistance value R of high-efficiency blind hole block masonry, (m ² ·K)/W; the basic thermal resistance R ₀ is the masonry thermal resistance of the non-porous body block (ordinary autoclaved aerated concrete block); when the hole width is equal to the block width, it is b. Figure 5 is a schematic diagram of the distribution of double rows of blind holes on the autoclaved aerated concrete block; Figure 6 is the left view of Figure 5; Figure 7 is a schematic diagram of the first distribution scheme of three rows of blind holes on the autoclaved aerated concrete block; Figure 8 is The left view of Fig. 7; Fig. 9 is a schematic diagram of the second distribution scheme of three rows of blind holes on the autoclaved aerated concrete block; Fig. 10 is a schematic diagram of the third distribution scheme of three rows of blind holes on the autoclaved aerated concrete block; Figure 12 is a schematic diagram of three rows of blind hole distribution scheme 4 on an autoclaved aerated concrete block; Figure 13 is a schematic diagram of three rows of blind holes on an autoclaved aerated concrete block The fifth schematic diagram of the hole distribution scheme; Figure 14 is the sixth schematic diagram of the three rows of blind hole distribution scheme on the autoclaved aerated concrete block; Figure 15 is the seventh schematic diagram of the three rows of blind hole distribution scheme on the autoclaved aerated concrete block; Schematic diagram of four rows of blind hole distribution scheme 2 on the pressurized aerated concrete block (Example 2).

In the figure: 1-long blind hole; 2-medium blind hole; 3-short blind hole.

Detailed ways

Example 1

As shown in Figure 1, an autoclaved aerated concrete block has four rows of blind holes, two middle blind holes are arranged side by side in the first and third rows, and the second and fourth rows are from left to There are short blind holes, middle blind holes and short blind holes arranged side by side on the right. Open 4 rows of flat strip vertical blind holes downward on the upper surface of the block, the hole width is 16-18 mm, and the distance between the bottom of the blind hole and the bottom plane of the block body is 10±0.5 mm; 2≤ on each row The number of blind holes is ≤4, the distance between blind holes and blind holes is greater than 30 mm, the distance between two rows of blind holes is ≥30 mm and ≤60 mm; the side ribs at both ends of the block body along the length direction are not less than 30 mm , The side ribs on both sides along the width direction are not less than 40 mm; the core hole ratio of the autoclaved aerated concrete block is not more than 23.0%. At the four corners of the end of the flat blind hole, chamfers with a radius of 5 mm are provided.

Blind holes are divided into three types: long blind holes, medium blind holes, and short blind holes. 227mm. Holes can be combined into various forms to effectively block heat flow. According to the organic combination of the three kinds of holes in this scheme, at least two rows of holes can achieve the effect of this scheme. The width of the blind hole is 16-18 mm. After a lot of experimental research, it is found that the width of the blind hole is closely related to the thermal resistance of the product of this solution. When the width of the blind hole is less than 12 mm or greater than 22 mm, the thermal resistance decreases, and the thermal resistance value increases by less than 35% compared with the non-porous block of the body, and the effect is not ideal. A large number of experimental results prove that the thermal resistance is the best when the hole width is 16-18 mm. This is mainly because when the width of the blind hole is less than 12 mm, the radiation heat transfer in the hole is intensified; when the width of the blind hole is greater than 22 mm, the convective heat transfer of the air in the hole along the two side walls of the hole is intensified. The measured results are shown in the trend chart of thermal resistance and hole width below. When the hole width is the block width b, the thermal resistance is zero and there is no heat preservation effect.

The hole width of this scheme is 16-18 mm. This is an important conclusion of this program. This program uses the thermal performance tester of the protective hot box method to test according to the national standard GB/T 13475-2008 "Adiabatic Steady State Heat Transfer System Determination Calibration and Protective Hot Box Method". For the different hole widths of the hole types of this plan The blocks were compared and studied, and the statistical rules are shown in Figure 4. See Figure 4 for the relationship curve (statistical chart) between blind hole width and thermal group.

Product specifications require high dimensional accuracy. Compared with the blocks that meet the standard of GB 11968-2008 "Autoclaved Aerated Concrete Blocks", the requirements for length, width, and thickness deviations are increased, and the control is within ±0.5mm, while the hole width deviation control is increased to ±0.5mm , to ensure optimum thermal performance.

The high-performance autoclaved aerated concrete block of this program is used as the raw material, and it is finely processed in the special milling machine for high-performance autoclaved aerated concrete block---machining center. After processing the four sides of the block, it is milled in parallel rows The drilled lathe is moved and processed, and the hole is formed at one time. The hole depth is 10 mm smaller than the block thickness, forming a blind hole block. When building the wall, the block is built in reverse, and the thin mortar joint masonry is completely realized. The mortar joint is controlled at 2.5 ±0.5 mm, which greatly reduces the impact of the thermal bridge of the gray joints brought by the traditional masonry method, and ensures the effectiveness of the thermal performance of the wall.

Using the protective hot box method thermal performance tester, according to GB/T 13475-2008 "Adiabatic Steady State Heat Transfer System Determination Calibration and Protective Hot Box Method", after a large number of experimental data verification, the following conclusions are drawn:

When the distance P between the bottom of the blind hole and the bottom plane of the block body increases by 10 mm, the thermal resistance decreases by about 3%. When it reaches 30 mm, the thermal resistance decreases by more than 11%. For example: a block with a specification of 600×300×200mm , the height is 200 mm, when the value of P is 30 mm:

The thermal bridge area ratio is 15%, the heat lost through the external wall increases by 15%, and the thermal resistance decreases by 15%, which is a harmful technical solution.

Therefore, the smaller the distance P value from the bottom of the blind hole to the bottom plane of the block body, the better. However, when it is a through hole, the masonry mortar will fall into the hole along the upper opening of the hole during the construction process, losing the meaning of opening the hole. , Practice has proved that it is difficult to guarantee the thermal performance of the through hole during the construction process.

The waste slag discharged from the fine processing production line can be recycled to the autoclaved aerated concrete block production line for recycling, so as to achieve clean production, energy saving and emission reduction.

Efficient thermal insulation performance. The difference between this scheme and other insulation cutting blocks is that there is no need to fill the block holes with high-efficiency insulation materials, and there is no need to pour foam materials or vitrified microbead insulation materials. Using the unique blind hole structure of the block, it is cut into Behind the wall, all blind holes in the block form a heat flow blocking structure of the closed structure in the wall. According to GB/T 13475-2008 "Determination and Calibration of Adiabatic Steady-state Heat Transfer System and Protective Hot Box Method", after a large number of tests, the products processed by this technology have the same performance as the raw materials (the autoclaved gas Compared with concrete), the thermal conductivity remains unchanged (the nature of the material remains unchanged), and other physical properties are almost unchanged. The comparison wall is built in accordance with GB/T 13475-2008 "Adiabatic Steady State Heat Transfer System" Determination Calibration and Protective Heat Box According to the detection method, the thermal resistance is about doubled, and the thermal resistance of the wall (blocks with three rows and four rows of holes) is greater than 2.60 (m ² ·K)/W.

The unique processing method of this scheme is also applicable to the blocks made of all possible base materials such as concrete, light aggregate concrete, foamed cement, etc., and the milling method of this method is used for processing, but the thermal performance of the processed products is difficult. Guarantee, also can't reach the effect of this scheme.

Example 2

The similarities between this embodiment and Embodiment 1 will not be described again. The difference is that the distribution of blind holes in the block of Embodiment 2 is shown in Figure 16 (four-row hole layout scheme 2), and the indicators are as follows:

One of the dimensions of the block body is 597×240×237 mm, which is processed and formed in a fine machining center at one time by using the processing method of this scheme. There are 4 rows of blind holes on it. The blind hole type described in this plan is a rectangular hole with chamfers. There are three types, which are divided into three types: long blind hole, medium blind hole and short blind hole. The hole lengths are 537 mm, 253 mm, 111 mm, hole width 16 mm; hole height 227 mm; hole-to-hole thermal bridge size and width greater than 30 mm, distance between two rows of holes ≥ 30 mm and ≤ 60 mm; side ribs at both ends of the block body along the length direction Less than 30 mm, and the side ribs on both sides along the width direction are not less than 40 mm; the size deviation of blocks and holes is controlled within ±0.5 mm.

The combination of different types of blind holes forms various forms of blocks, but the number of holes in each row of holes does not exceed 4, so as to control the heat transfer path as long as possible and reduce the number of thermal bridges to achieve the best effect.

Only use the size symbols in Figure 1 to illustrate the specification dimensions:

(The size of the raw material autoclaved aerated concrete block body is 600×240×240mm)

The main specification of the product is a×b×h＝597×240×237mm; other specifications meet the standard requirements of GB 11968-2008 "Autoclaved Aerated Concrete Blocks"

End side rib y≥30 mm (requirements for the structure of this scheme)

Side ribs x≥40 mm (requirements for the structure of this scheme)

Width of blind hole w: 16 mm (Requirements for the construction of this scheme)

  Thermal Bridge Z : 30mm Structural connection part, the purpose of controlling its size is to control the cross-sectional area of heat flow transfer and improve thermal performance. Also known as a thermal bridge. the

The distance P between the bottom of the hole and the bottom plane of the block body is 10 mm.

The distance between two adjacent rows of blind holes must be: ≥30 mm. and ≤60 mm;

The production process of this program:

Embryo body size: 600×240×240mm; cutting and washing hole error control: ±0.5mm;

Product size: 597×240×237mm; drying and drying control index: moisture content ≤ 6%;

Vacuuming: vacuum degree ≥ 500Pa.

Construction usage method:

1. Use special masonry mortar to meet JC890-2001 "Masonry Mortar and Plastering Mortar for Autoclaved Aerated Concrete".

2. Turn the top and bottom surfaces of the block of this plan over 180°, put the blind hole downward, apply mortar on the bottom surface, and build the block upside down to form a closed hole.

In the sand aerated concrete block production line test, add the greenness enhancer of the formula of Example 1 of this plan in the pulping process, the admixture amount is 6.0% of the powder amount, stir and make slurry, and use domestic autoclaved aerated concrete The block production process is used for production, using the high temperature (190°C), high humidity (greater than 100%), high pressure (steam pressure 1.2MPa) environment during the autoclaving process, and steaming for 8 hours.

 The main body block is used as the production base material of the blind hole block. After the two ends and the upper and lower sides are cut in the fine processing production line, the holes are milled, and after 6 minutes of rapid drying, vacuum packaging is carried out after cooling. Then, in accordance with GB 4111-1997 "Inspection Method for Small Concrete Hollow Blocks", the universal material testing machine is used to carry out the compressive strength test; in accordance with GB 11969-2008 "Autoclaved Aerated Concrete Test Method", electronic balance and electric blast are used. Drying box to conduct block density test; using protective hot box method thermal performance detector, according to GB/T 13475-2008 "Adiabatic Steady State Heat Transfer System Determination Calibration and Protective Hot Box Method" to conduct masonry thermal group experiments .

Blind-hole autoclaved aerated concrete blocks and special masonry mortar are used for masonry testing on the installation part of the thermal performance detector by the protective hot box method to build a naked wall (no plastering on both sides of the wall, only pointing) ), the mortar joints are controlled at 2.5±0.5 mm, and the experiment is carried out 10 days after the completion of the masonry, the ambient temperature of the laboratory is 20±3°C, and the width of the four rows of blind holes is measured to be 16 mm: the thermal resistance is 2.668 (m ² ·K)/W; the compressive strength is 4.4MPa, and the density of blind hole blocks is 456kg/m ³ . The measured compressive strength of the body block is 6.9MPa, and the density of the non-porous block is 576kg/m ³ .

Comparative example 1

This comparative example adopts the same test conditions as in Example 2, uses the testing equipment universal material testing machine, carries out the compressive strength test according to GB 4111-1997 "Concrete Small Hollow Block Test Method", and uses the thermal performance test of the protective hot box method Instrument, according to GB/T 13475-2008 "Adiabatic Steady State Heat Transfer System Determination Calibration and Protected Hot Box Method" for thermal group experiments.

The test sample is an ordinary autoclaved aerated concrete block (sand aerated), and the sample size of the embryonic block is the same. Four rows of circles are arranged, and each row adopts 10 circular blind holes with a diameter of 15 mm. The hole depth is deeper than that of the block. The thickness is less than 30mm; the width of the autoclaved aerated concrete block is 240mm.

Comparative example 2

This example adopts the same test conditions as Example 2, and the sample size of the embryo body block is the same. Each row adopts 20 circular blind holes with a diameter of 15 mm, and the hole depth is 30 mm smaller than the thickness of the block; the width of the autoclaved aerated concrete block is 240 mm.

Comparative example 3

This example adopts the same test conditions as Example 2. The difference is that the common autoclaved aerated concrete block (sand aerated), and the sample size of the embryo body block are the same. Width 15mm scheme sample.

Comparative example 4

    This example uses the same test conditions as Example 2. The difference is that the test sample is an ordinary autoclaved aerated concrete block, and the block sample has the same specification and size, and is a non-porous block.

Test conclusion: The density of the non-porous blocks is about 580 kg, and the results of the thermal resistance of the masonry and the compressive strength of the blocks are as follows:

                                                                                             

Comparative Example 1: 1.464 (m ² ·K)/W; 3.6 MPa Same as Comparative Example 4

Comparative Example 2: 1.748 (m ² ·K)/W; 3.1 MPa Same as Comparative Example 4

Comparative Example 3: 1.869 (m ² ·K)/W; 2.4 MPa Same as Comparative Example 4

Comparative example 4: 1.217 (m ² ·K)/W; 4.3 MPa 589kg/m ³

Example 3: 2.668 (m ² ·K)/W; 4.4 MPa 576kg/m ³

The analysis of the above results shows that:

A: The thermal resistance of Comparative Example 2 is only 1.748 (m ² ·K)/W, compared with Comparative Example 4, the thermal resistance is only increased by 43.6%, and the compressive strength is 3.1 MPa, which does not meet the minimum requirement of 3.5 MPa for this scheme ;

The program embodiment 3, comparative example 2, and comparative example 4 are compared with each other, the thermal resistance result of embodiment 3 is 152.6% of comparative example 2, and the embodiment 3 is 219.22% of comparative example 4; the thermal resistance result of comparative example 2 is the comparative example 146.3% of 4, is 65.5% of embodiment 3;

Embodiment 3 of this program, comparative example 2, and comparative example 3 are compared with each other, and the thermal resistance result of embodiment 3 is 142.8% of comparative example 3; the thermal resistance result of comparative example 2 is 93.5% of comparative example 3, and comparative example 2 is the embodiment 65.5% of 3;

It shows that the effect of the blind hole width of 16 mm in Example 3 of this program cannot be replaced by the 15 mm of Comparative Example 2 and Comparative Example 3, that is to say, the effect of 15 mm is not acceptable.

Comparing Example 3 of this program with Comparative Example 2, the compressive strength of Example 3 is 141.9% of that of Comparative Example 2, and the compressive strength of the blind hole block in Example 3 is basically the same as that of the non-porous block sample of Comparative Example 4. same.

This shows that ordinary autoclaved aerated concrete blocks cannot achieve the effect of this scheme without adopting the enhanced modification technology of this scheme. Simultaneously, it also shows that the technical effect of this program is far beyond that of Comparative Examples 1 and 2.

B: Compared with Comparative Example 3, which adopts the hole type of this scheme, the thermal resistance is increased by 6.9%, and the compressive strength is 2.4 MPa. Compared with Comparative Example 2, the compressive strength is reduced by 41.5%. This result has been confirmed It cannot meet the requirements of GB 50574-2010 "Unified Technical Specifications for Application of Wall Materials".

According to the relationship curve between the strength and porosity of autoclaved aerated concrete blocks, the higher the porosity, the lower the strength. When the circular holes become elongated holes, the relationship between the compressive strength and the porosity becomes an exponential decay relationship, so A circular pore structure cannot be transformed into an elongated pore structure. Especially when the porosity rate is 24%, the compressive strength attenuation is more severe, so this scheme controls the core hole porosity rate to not exceed 24%. ``

This shows that the main body block referred to in the 201020602891.5 patent, even if the plan with a flat and long hole width of 15 mm is adopted, not only the technical result of this plan cannot be achieved, but also its compressive strength cannot meet the standard requirements, and the products produced can no longer meet the requirements. GB 50574-2010 "Unified Technical Specifications for Application of Wall Materials".

Example 3 (see Figure 5)

The similarities between this embodiment and Embodiment 1 will not be repeated, and the difference is that the distribution of blind holes in the block of Embodiment 3 is shown in Figure 5, which is a block with double rows of holes and blind holes.

The production process is the same as in Example 2, and the test method is the same as in Example 2. The width of the double-row blind holes is 18 mm. Two rows of flat strip-shaped vertical blind holes are opened downward on the upper surface of the block. The hole width is 18 mm. The distance between the end and the bottom plane of the block body is 10±0.5 mm; the number of blind holes on each row is 1, the distance between blind holes and blind holes is greater than 30 mm, and the distance between two rows of blind holes is 60 mm; the block body The side ribs at both ends along the length direction are not less than 30 mm, and the side ribs on both sides along the width direction are greater than 40 mm; the core hole ratio of autoclaved aerated concrete blocks is 12.9%. At the four corners of the end of the blind hole, a chamfer with a radius of 5 mm is provided.

The measured results are: the thermal resistance is 2.275 (m ² ·K)/W; the compressive strength is 4.2 MPa, and the density of double-row long blind hole blocks is 518kg/m ³ . The compressive strength of the non-porous block of the body is 6.3MPa, and the density is 603kg/m ³ .

Example 4

The similarities between this embodiment and Embodiment 1 will not be described again. The difference is that the distribution of blind holes in the block of Embodiment 4 is shown in Figures 7 and 8, which is a block with three rows of blind holes. There are three rows of blind holes, two middle blind holes are arranged side by side in the first row and the third row, and long blind holes are arranged in the second row. The production process and test method are the same as in Example 2. The width of the three rows of blind holes is 16 mm. Three rows of flat strip vertical blind holes are opened downward on the upper surface of the block. The width of the holes is 16 mm. The distance between the bottom plane of the block body is 10±0.5 mm; the number of blind holes on each row is less than or equal to 2, the distance between blind holes and blind holes is greater than 30 mm, and the distance between blind holes in each row is 56 mm; The side ribs at both ends in the length direction are not less than 30 mm, and the side ribs on both sides along the width direction are 40 mm; the core hole rate of autoclaved aerated concrete blocks is 22.9%. At the four corners of the end of the blind hole, a chamfer with a radius of 5 mm is provided.

The measured results are: the thermal resistance is 2.603 (m ² ·K)/W; the compressive strength is 3.8 MPa, and the density of the blocks with three rows of blind holes is 482kg/m ³ . The measured compressive strength of the main body block is 6.5MPa, and the block density is 576kg/ ^m3

It can be seen from the above Examples 1, 2, and 3 that the greenness enhancer has the best enhancement effect when the dosage is 6.0% of the powder. A large number of experiments have proved that: when the addition amount is lower than 5% or higher than 8%, the strength enhancement effect is relatively reduced.

Example 5

    The similarities between this example and Example 1 will not be repeated. The difference is that the distribution of blind holes in the block of Example 5 is shown in Figure 9-15. The distribution scheme of three rows of blind holes on the autoclaved aerated concrete block Seven schematic diagrams.

Claims (4)

1. An autoclaved aerated concrete block, characterized in that 2 to 4 rows of flat strip-shaped vertical blind holes are opened downward along the upper surface of the block, the hole width is 16 mm to 18 mm, and the bottom of the blind hole is The distance between the end and the bottom plane of the block body is 10±0.5 mm; 1≤The number of blind holes in each row is ≤4, the distance between blind holes and blind holes must be greater than 30 mm, and the distance between two rows of blind holes must be ≥ 30 mm and ≤60 mm; the side ribs at both ends of the block body along the length direction shall not be less than 30 mm, and the side ribs on both sides along the width direction shall not be less than 40 mm; the core hole ratio of autoclaved aerated concrete blocks shall not exceed 24.0 %. 2. The autoclaved aerated concrete block according to claim 1, characterized in that the four corners of the ends of the blind holes are provided with chamfers with a radius of 5 mm. 3. The autoclaved aerated concrete block according to claim 1, characterized in that the blind holes are 4 rows, the first row and the third row arrange two middle blind holes side by side, the second row and the fourth row There are short blind holes, middle blind holes and short blind holes arranged side by side from left to right. 4. The autoclaved aerated concrete block according to claim 1, characterized in that the blind holes are in three rows, two middle blind holes are arranged side by side in the first row and the third row, and long blind holes are arranged in the second row. hole.

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