Autoclaved fly ash brick for building and manufacturing method thereof

Abstract

The present invention relates to the technical field of fly ash bricks, specifically to an autoclaved fly ash brick for construction and a method for manufacturing the same. The brick comprises the following raw materials in parts by weight: 60-80 parts fly ash, 20-40 parts carbide slag, 10-20 parts a first filler, 10-20 parts river sand, 8-12 parts a foaming agent, 8-12 parts a second filler, 6-10 parts silica, and 6-10 parts gypsum. In the present invention, sodium lauryl sulfate in the treatment liquid can improve the interfacial bonding strength between the fiber and the cement matrix, and urea, as a hydrogen bond breaker, can promote the expansion of keratin molecular chains and increase the binding sites with inorganic materials. After electrospinning, keratin can be composited with polyacrylonitrile to form a fiber material. The fiber material forms a three-dimensional network skeleton in the formed brick body, effectively improving the strength performance of the autoclaved fly ash brick for construction.

Description

Technical Field

[0001] The invention relates to the technical field of fly ash bricks, in particular to an autoclaved fly ash brick for construction and a manufacturing method thereof. Background Art

[0002] Autoclaved fly ash bricks are building materials made from fly ash, carbide slag and other raw materials. They have certain strength and durability and can be used in building structures such as walls. They are a new type of wall material that is energy-saving and environmentally friendly.

[0003] In the prior art, the fly ash raw material of autoclaved fly ash bricks is unstable in activity and has large fluctuations in composition, which can easily lead to a less dense internal structure of the bricks and affect the strength of the bricks. Based on this, the present invention provides an autoclaved fly ash brick for construction and a method for manufacturing the same. Summary of the Invention

[0004] The object of the present invention is to provide an autoclaved fly ash brick for construction and a method for manufacturing the same. The autoclaved fly ash brick for construction prepared by the present invention not only has good flexural strength but also has excellent compressive strength, thereby effectively improving the performance of the autoclaved fly ash brick for construction.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides an autoclaved fly ash brick for construction, comprising the following raw materials in parts by weight: 60 to 80 parts fly ash, 20 to 40 parts carbide slag, 10 to 20 parts first filler, 10 to 20 parts river sand, 8 to 12 parts foaming agent, 8 to 12 parts second filler, 6 to 10 parts silicon dioxide, and 6 to 10 parts gypsum;

[0007] The raw materials of the first filler are composed of fiber material, cement, and plant ash, and the mass ratio of the fiber material, cement, and plant ash is 1: (0.6-0.8): (0.4-0.6);

[0008] The raw materials of the second filler are composed of vermiculite, sepiolite, metakaolin and zeolite, and the mass ratio of the vermiculite, sepiolite, metakaolin and zeolite is 1:(2-3):(3-4):(0.4-0.8).

[0009] Furthermore, the fiber material is prepared by the following method: the fiber material is selected from chicken feathers recycled from the factory as raw material, the chicken feathers are soaked and rinsed after being recycled, and then sent to an oven, and the oven is set at 40-50°C for drying for 2-4 hours. The dried chicken feathers are crushed to form powder, and the particle size of the powder is 20-80 μm.

[0010] Furthermore, the powder is immersed in a mixture of ethanol and ether, the mass ratio of the ethanol and ether is 1:1, the soaking time is 10 to 20 minutes, the product obtained after soaking is added to a water bath, and a treatment liquid is added to the water bath, the mass of the treatment liquid is 120 to 140% of the mass of the product obtained after soaking, the water bath is set to heat up to 80 to 90 ° C, and the heat preservation reaction is carried out for 2 to 4 hours to obtain a first mixed liquid, the first mixed liquid is allowed to stand and cool, and the second mixed liquid is added to the first mixed liquid to obtain a third mixed liquid, the mass of the second mixed liquid is 60 to 70% of the mass of the first mixed liquid, and the third mixed liquid is injected into an electrospinning machine, the electrospinning machine is set to a voltage of 16 to 20 kV and a temperature of 40 to 44 ° C, and the product obtained by electrospinning is cut into pieces with a cutting length of 2 to 4 mm to obtain a fiber material.

[0011] Furthermore, the treatment liquid is prepared by mixing sodium bisulfate, sodium lauryl sulfate, urea and deionized water, and the mass ratio of the sodium bisulfate, sodium lauryl sulfate, urea and deionized water is 1: (0.6-0.8): (3-5): (4-7).

[0012] Furthermore, the second mixed liquid is a mixture of polyacrylonitrile and dimethylacetamide, and the mass ratio of the polyacrylonitrile to dimethylacetamide is 1:1.2.

[0013] Furthermore, the first filler is prepared by the following method: fiber material and cement are added to a mixer, water is added to the mixer, the mass of the water is 2 to 3 times the mass of the cement, the mixer is set at 400 to 500 r / min and stirred for 6 to 10 minutes, and wood ash is added during the stirring process to prepare the first filler.

[0014] Furthermore, the vermiculite, sepiolite, metakaolin and zeolite are all in powder form with a particle size of 20 to 60 μm, and the silicon dioxide is in powder form with a particle size of 10 to 20 μm.

[0015] Furthermore, the second filler is prepared by the following method: vermiculite, sepiolite, metakaolin, and zeolite are added to a mixer, silicon dioxide is added to the mixer, and the mixer is set to 800-1000 r / min and stirred for 40-50 minutes to prepare the second filler.

[0016] Furthermore, the cement is silicate cement.

[0017] In a second aspect, the present invention provides a method for preparing autoclaved fly ash bricks for construction, comprising the following steps:

[0018] S1: Fly ash, carbide slag, a first filler, river sand, a foaming agent, a second filler and gypsum are weighed as needed and added to a mixer. The mixer is set at 400-500 r / min and stirred for 20-30 min to obtain a primary mixture. Water is added to the primary mixture, and the mass of the water is 10-20% of the mass of the mixed materials in the mixer. The mixer is set at 200-300 r / min and stirred for 50-60 min. The mixture is allowed to stand for 6-10 days to obtain a mixture.

[0019] S2: The mixed material is poured into a mold to form a blank, and the blank is sent to a steam curing kettle. After the steam curing kettle is evacuated, the temperature is set to 160-220° C. and the pressure is set to 10-16 MPa. The heat and pressure are kept for 12-16 hours, and then the steam is discharged. After cooling, the blank is stored for 25-35 days to obtain autoclaved fly ash bricks for construction.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, by adding a first filler during the preparation process of autoclaved fly ash bricks for construction, the first filler utilizes chicken feathers that are rich in keratin, and a mixed treatment of ethanol and ether can remove impurities on the surface of the chicken feathers, retaining the complete fiber structure of the keratin. The sodium lauryl sulfate in the treatment liquid can improve the interfacial bonding strength between the fiber and the cement matrix. Urea, as a hydrogen bond breaker, can promote the expansion of keratin molecular chains and increase the binding sites with inorganic materials. After electrostatic spinning treatment, keratin can be composited with polyacrylonitrile to form a fiber material. The fiber material forms a three-dimensional network skeleton in the formed brick body, effectively improving the strength performance of the autoclaved fly ash bricks for construction.

[0022] 2. In the present invention, by adding the second filler during the preparation process of autoclaved fly ash bricks for construction, the vermiculite layers in the second filler contain a certain amount of air, and the fibrous structure of sepiolite and the porous structure of zeolite can effectively prevent the transfer of heat, thereby making the autoclaved fly ash bricks have good thermal insulation properties. At the same time, these materials are evenly dispersed in the brick body, which can enhance the toughness of the brick body and further improve the strength performance of the autoclaved fly ash bricks for construction. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] It should be noted that the raw materials used in the following examples are all commercially available raw materials.

[0025] Example 1:

[0026] A type of autoclaved fly ash brick for construction, comprising the following raw materials in parts by weight: 60 parts of fly ash, 20 parts of carbide slag, 10 parts of a first filler, 10 parts of river sand, 8 parts of a foaming agent, 8 parts of a second filler, 6 parts of silicon dioxide, and 6 parts of gypsum;

[0027] The raw materials of the first filler are composed of fiber material, cement, and plant ash, and the mass ratio of the fiber material, cement, and plant ash is 1: (0.6): (0.4);

[0028] The raw materials of the second filler are composed of vermiculite, sepiolite, metakaolin and zeolite, and the mass ratio of vermiculite, sepiolite, metakaolin and zeolite is 1:(2):(3):(0.4).

[0029] The fiber material is prepared by the following method: the fiber material is selected from chicken feathers recycled from the factory as raw material, the chicken feathers are soaked and rinsed after recycling, and then sent to an oven, and the oven is set at 40°C for drying for 2 hours. The dried chicken feathers are crushed to make powder, and the powder particle size is 20μm.

[0030] The powder is immersed in a mixture of ethanol and ether, the mass ratio of ethanol to ether is 1:1, and the soaking time is 10 minutes. The product obtained after soaking is added to a water bath, and a treatment liquid is added to the water bath. The mass of the treatment liquid is 120% of the mass of the product obtained after soaking. The water bath is set to 80°C and kept warm for 2 hours to obtain a first mixed liquid. The first mixed liquid is allowed to stand and cool. The second mixed liquid is added to the first mixed liquid to obtain a third mixed liquid. The mass of the second mixed liquid is 60% of the mass of the first mixed liquid. The third mixed liquid is injected into an electrospinning machine. The voltage of the electrospinning machine is set to 16 kV and the temperature is 40°C. The product obtained by electrospinning is cut into pieces with a cutting length of 2 mm to obtain a fiber material.

[0031] The treatment liquid is prepared by mixing sodium bisulfate, sodium lauryl sulfate, urea and deionized water, and the mass ratio of sodium bisulfate, sodium lauryl sulfate, urea and deionized water is 1:(0.6):(3):(4).

[0032] The second mixed liquid is a mixture of polyacrylonitrile and dimethylacetamide, and the mass ratio of polyacrylonitrile to dimethylacetamide is 1:1.2.

[0033] The first filler is prepared by the following method: fiber material and cement are added to a mixer, water is added to the mixer, the mass of the water is twice the mass of the cement, the mixer is set at 400 r / min and stirred for 6 minutes, and wood ash is added during the stirring process to prepare the first filler.

[0034] Vermiculite, sepiolite, metakaolin and zeolite are all in powder form with a particle size of 20 μm, and silicon dioxide is in powder form with a particle size of 10 μm.

[0035] The second filler is prepared by the following method: vermiculite, sepiolite, metakaolin and zeolite are added into a mixer, silicon dioxide is added into the mixer, and the mixer is set at 800 r / min and stirred for 40 minutes to prepare the second filler.

[0036] The cement used is silicate cement.

[0037] A method for preparing autoclaved fly ash bricks for construction comprises the following steps:

[0038] S1: fly ash, carbide slag, first filler, river sand, foaming agent, second filler and gypsum are weighed as needed and added to a mixer. The mixer is set at 400 r / min and stirred for 20 min to obtain a primary mixture. Water is added to the primary mixture, and the mass of the water is 10% of the mass of the mixed materials in the mixer. The mixer is set at 200 r / min and stirred for 50 min. The mixture is allowed to stand and age for 6 days to obtain a mixture.

[0039] S2: The mixture is poured into a mold to form a blank, which is then sent to a steam curing autoclave. After the autoclave is evacuated, the temperature is set to 160°C and the pressure is 10 MPa. The autoclave is kept warm and pressure maintained for 12 hours, and then the steam is discharged. After cooling, the autoclave is allowed to stand for 25 days to produce autoclaved fly ash bricks for construction.

[0040] Example 2:

[0041] A type of autoclaved fly ash brick for construction, comprising the following raw materials in parts by weight: 70 parts of fly ash, 30 parts of carbide slag, 15 parts of a first filler, 15 parts of river sand, 10 parts of a foaming agent, 10 parts of a second filler, 8 parts of silicon dioxide, and 8 parts of gypsum;

[0042] The raw materials of the first filler are composed of fiber material, cement, and plant ash, and the mass ratio of the fiber material, cement, and plant ash is 1: (0.7): (0.5);

[0043] The raw materials of the second filler are composed of vermiculite, sepiolite, metakaolin and zeolite, and the mass ratio of vermiculite, sepiolite, metakaolin and zeolite is 1:(2.5):(3.5):(0.6).

[0044] The fiber material is prepared by the following method: the fiber material is selected from chicken feathers recycled from the factory as raw material, the chicken feathers are soaked and rinsed after recycling, and then sent to an oven, and the oven is set at 45°C for drying for 3 hours. The dried chicken feathers are crushed to make powder, and the powder particle size is 50μm.

[0045] The powder is immersed in a mixture of ethanol and ether, the mass ratio of ethanol to ether is 1:1, and the soaking time is 15 minutes. The product obtained after soaking is added to a water bath, and a treatment liquid is added to the water bath. The mass of the treatment liquid is 130% of the mass of the product obtained after soaking. The water bath is set to 85°C and kept warm for 3 hours to obtain a first mixed liquid. The first mixed liquid is allowed to stand and cool. The second mixed liquid is added to the first mixed liquid to obtain a third mixed liquid. The mass of the second mixed liquid is 65% of the mass of the first mixed liquid. The third mixed liquid is injected into an electrospinning machine. The voltage of the electrospinning machine is set to 18 kV and the temperature is 42°C. The product obtained by electrospinning is cut into pieces with a cutting length of 3 mm to obtain a fiber material.

[0046] The treatment liquid is prepared by mixing sodium bisulfate, sodium lauryl sulfate, urea and deionized water, and the mass ratio of sodium bisulfate, sodium lauryl sulfate, urea and deionized water is 1: (0.7): (4): (5).

[0047] The second mixed liquid is a mixture of polyacrylonitrile and dimethylacetamide, and the mass ratio of polyacrylonitrile to dimethylacetamide is 1:1.2.

[0048] The first filler is prepared by the following method: fiber material and cement are added to a mixer, water is added to the mixer, the mass of the water is 2.5 times the mass of the cement, the mixer is set to 450r / min and stirred for 8 minutes, and wood ash is added during the stirring process to prepare the first filler.

[0049] Vermiculite, sepiolite, metakaolin and zeolite are all in powder form with a particle size of 40 μm, and silicon dioxide is in powder form with a particle size of 15 μm.

[0050] The second filler is prepared by the following method: vermiculite, sepiolite, metakaolin and zeolite are added into a mixer, silicon dioxide is added into the mixer, and the mixer is set at 900 r / min and stirred for 45 minutes to prepare the second filler.

[0051] The cement used is silicate cement.

[0052] A method for preparing autoclaved fly ash bricks for construction comprises the following steps:

[0053] S1: Fly ash, carbide slag, first filler, river sand, foaming agent, second filler and gypsum are weighed as needed and added to a mixer. The mixer is set at 450 r / min and stirred for 25 min to prepare a primary mixture. Water is added to the primary mixture, and the mass of water is 15% of the mass of the mixed materials in the mixer. The mixer is set at 250 r / min and stirred for 55 min. The mixture is allowed to stand and age for 8 days to prepare a mixture.

[0054] S2: The mixture is poured into a mold to form a blank, which is then sent to a steam curing autoclave. After the autoclave is evacuated, the temperature is set to 190°C and the pressure is 13 MPa. The autoclave is kept warm and pressure maintained for 14 hours, and then the steam is discharged. After cooling, the autoclave is allowed to stand for 30 days to produce autoclaved fly ash bricks for construction.

[0055] Example 3:

[0056] A type of autoclaved fly ash brick for construction, comprising the following raw materials in parts by weight: 80 parts of fly ash, 40 parts of carbide slag, 20 parts of a first filler, 20 parts of river sand, 12 parts of a foaming agent, 12 parts of a second filler, 10 parts of silicon dioxide, and 10 parts of gypsum;

[0057] The raw materials of the first filler are composed of fiber material, cement, and plant ash, and the mass ratio of the fiber material, cement, and plant ash is 1: (0.8): (0.6);

[0058] The raw materials of the second filler are composed of vermiculite, sepiolite, metakaolin and zeolite, and the mass ratio of vermiculite, sepiolite, metakaolin and zeolite is 1:(3):(4):(0.8).

[0059] The fiber material is prepared by the following method: the fiber material is selected from chicken feathers recycled from the factory as raw material. After the chicken feathers are recycled, they are soaked and rinsed, and then sent to an oven. The oven is set at 50°C for drying for 4 hours. The dried chicken feathers are crushed to make powder with a particle size of 80μm.

[0060] The powder is immersed in a mixture of ethanol and ether, the mass ratio of ethanol to ether is 1:1, and the soaking time is 20 minutes. The product obtained after soaking is added to a water bath, and a treatment liquid is added to the water bath. The mass of the treatment liquid is 140% of the mass of the product obtained after soaking. The water bath is set to heat up to 90°C and kept warm for 4 hours to obtain a first mixed liquid. The first mixed liquid is allowed to stand and cool. The second mixed liquid is added to the first mixed liquid to obtain a third mixed liquid. The mass of the second mixed liquid is 70% of the mass of the first mixed liquid. The third mixed liquid is injected into an electrospinning machine. The voltage of the electrospinning machine is set to 20 kV and the temperature is 44°C. The product obtained by electrospinning is cut into pieces with a cutting length of 4 mm to obtain a fiber material.

[0061] The treatment liquid is prepared by mixing sodium bisulfate, sodium lauryl sulfate, urea and deionized water, and the mass ratio of sodium bisulfate, sodium lauryl sulfate, urea and deionized water is 1: (0.8): (5): (7).

[0062] The second mixed liquid is a mixture of polyacrylonitrile and dimethylacetamide, and the mass ratio of polyacrylonitrile to dimethylacetamide is 1:1.2.

[0063] The first filler is prepared by the following method: fiber material and cement are added to a mixer, water is added to the mixer, the mass of the water is 3 times the mass of the cement, the mixer is set to 500r / min and stirred for 10 minutes, and wood ash is added during the stirring process to prepare the first filler.

[0064] Vermiculite, sepiolite, metakaolin and zeolite are all in powder form with a particle size of 60 μm, and silicon dioxide is in powder form with a particle size of 20 μm.

[0065] The second filler is prepared by the following method: vermiculite, sepiolite, metakaolin and zeolite are added into a mixer, silicon dioxide is added into the mixer, and the mixer is set at 1000 r / min and stirred for 50 minutes to prepare the second filler.

[0066] The cement used is silicate cement.

[0067] A method for preparing autoclaved fly ash bricks for construction comprises the following steps:

[0068] S1: fly ash, carbide slag, first filler, river sand, foaming agent, second filler and gypsum are weighed as needed and added to a mixer. The mixer is set at 500 r / min and stirred for 30 min to obtain a primary mixture. Water is added to the primary mixture, and the mass of the water is 20% of the mass of the mixed materials in the mixer. The mixer is set at 300 r / min and stirred for 60 min. The mixture is allowed to stand and age for 10 days to obtain a mixture.

[0069] S2: The mixture is poured into a mold to form a blank, which is then sent to a steam curing autoclave. After the autoclave is evacuated, the temperature is set to 220°C and the pressure is 16 MPa. The autoclave is kept warm and pressure maintained for 16 hours, and then the steam is discharged. After cooling, the autoclave is allowed to stand for 35 days to produce autoclaved fly ash bricks for construction.

[0070] Comparative Example 1: The difference between this comparative example and Example 1 is that in this comparative example, an equal amount of cement is used to replace the second filler.

[0071] Comparative Example 2: The difference between this comparative example and Example 1 is that in this comparative example, an equal amount of cement is used to replace the first filler.

[0072] Comparative Example 3: This comparative example is different from Example 1 in that the second filler is not included in this comparative example.

[0073] Comparative Example 4: This comparative example is different from Example 1 in that: this comparative example does not contain the first filler.

[0074] Performance test: The performance test was conducted on the autoclaved fly ash bricks for construction prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4. The test data are recorded in the following table:

[0075]

[0076] It can be seen that the flexural strength and compressive strength of the autoclaved fly ash bricks for construction prepared in Comparative Examples 1, 2, 3 and 4 are lower than those in Examples 1, 2 and 3; this shows that: by adding the first filler in the process of preparing the autoclaved fly ash bricks for construction, the first filler uses chicken feathers containing rich keratin, and the impurities on the surface of the chicken feathers can be removed by mixing ethanol and ether, retaining the complete fiber structure of keratin, and the sodium lauryl sulfate in the treatment liquid can improve the interfacial bonding strength between the fiber and the cement matrix, and urea as a hydrogen bond breaker can promote the expansion of the keratin molecular chain and increase the binding sites with inorganic materials. After treatment, keratin and polyacrylonitrile can be compounded to form a fiber material, which forms a three-dimensional network skeleton in the formed brick body, effectively improving the strength performance of the autoclaved fly ash brick for construction. By adding a second filler during the preparation process of the autoclaved fly ash brick for construction, the vermiculite layers in the second filler contain a certain amount of air, and the fibrous structure of sepiolite and the porous structure of zeolite can effectively prevent the transfer of heat, thereby making the autoclaved fly ash brick have good thermal insulation performance. At the same time, these materials are evenly dispersed in the brick body, which can enhance the toughness of the brick body and further improve the strength performance of the autoclaved fly ash brick for construction.

[0077] Comparison and analysis of the relevant data in the table show that the autoclaved fly ash bricks for construction produced by the present invention not only have good flexural strength but also excellent compressive strength. This indicates that the autoclaved fly ash bricks for construction provided by the present invention have a broader market prospect and are more suitable for promotion.

[0078] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0079] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An autoclaved fly ash brick for construction, characterized by: The invention comprises the following raw materials in parts by weight: 60 to 80 parts of fly ash, 20 to 40 parts of carbide slag, 10 to 20 parts of a first filler, 10 to 20 parts of river sand, 8 to 12 parts of a foaming agent, 8 to 12 parts of a second filler, 6 to 10 parts of silicon dioxide, and 6 to 10 parts of gypsum; The raw materials of the first filler are composed of fiber material, cement, and plant ash, and the mass ratio of the fiber material, cement, and plant ash is 1: (0.6-0.8): (0.4-0.6); The raw materials of the second filler are composed of vermiculite, sepiolite, metakaolin and zeolite, and the mass ratio of the vermiculite, sepiolite, metakaolin and zeolite is 1: (2-3): (3-4): (0.4-0.8); The fiber material is made of chicken feathers recycled from the factory. After the chicken feathers are recycled, they are soaked and rinsed, and then sent to an oven. The oven is set at 40-50°C for drying for 2-4 hours. The dried chicken feathers are crushed to form powder. The particle size of the powder is 20-80 μm. The powder is immersed in a mixture of ethanol and ether, wherein the mass ratio of the ethanol to the ether is 1:1, and the soaking time is 10 to 20 minutes. The product obtained after soaking is added to a water bath, and a treatment liquid is added to the water bath, wherein the mass of the treatment liquid is 120 to 140% of the mass of the product obtained after soaking. The water bath is set to be heated to 80 to 90° C., and the heat is kept for 2 to 4 hours to obtain a first mixed liquid. The first mixed liquid is allowed to stand and cool, and a second mixed liquid is added to the first mixed liquid to obtain a third mixed liquid, wherein the mass of the second mixed liquid is 60 to 70% of the mass of the first mixed liquid. The third mixed liquid is injected into an electrospinning machine, and the electrospinning machine is set to a voltage of 16 to 20 kV and a temperature of 40 to 44° C. The product obtained by electrospinning is cut into pieces with a cutting length of 2 to 4 mm to obtain a fiber material. The treatment liquid is prepared by mixing sodium bisulfate, sodium lauryl sulfate, urea and deionized water, wherein the mass ratio of the sodium bisulfate, sodium lauryl sulfate, urea and deionized water is 1: (0.6-0.8): (3-5): (4-7); The second mixed liquid is a mixture of polyacrylonitrile and dimethylacetamide, and the mass ratio of the polyacrylonitrile to dimethylacetamide is 1:1.

2.

2. The autoclaved fly ash brick for construction according to claim 1, characterized in that: The first filler is prepared by the following method: fiber material and cement are added to a mixer, water is added to the mixer, the mass of the water is 2 to 3 times the mass of the cement, the mixer is set at 400 to 500 r / min and stirred for 6 to 10 minutes, and wood ash is added during the stirring process to prepare the first filler.

3. The autoclaved fly ash brick for construction according to claim 1, characterized in that: The vermiculite, sepiolite, metakaolin and zeolite are all in powder form with a particle size of 20 to 60 μm. The silicon dioxide is in powder form with a particle size of 10 to 20 μm.

4. The autoclaved fly ash brick for construction according to claim 1, characterized in that: The cement is silicate cement.

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