Autoclaved fly ash-lime brick for building and manufacturing method of autoclaved fly ash-lime brick

Abstract

The invention relates to the technical field of fly ash bricks, in particular to a building autoclaved fly ash brick and a manufacturing method thereof. The building autoclaved fly ash brick is prepared from, by weight, 60-80 parts of fly ash, 20-40 parts of carbide slag, 10-20 parts of first filler, 10-20 parts of river sand, 8-12 parts of foaming agent, 8-12 parts of second filler, 6-10 parts of silicon dioxide and 6-10 parts of gypsum. According to the method, the lauryl sodium sulfate in the treating fluid can improve the interface bonding strength of fibers and a cement matrix, the urea serves as a hydrogen bond breaker and can promote expansion of keratin molecular chains and increase binding sites with inorganic materials, and after electrostatic spinning treatment, keratin and polyacrylonitrile can be compounded to form a fiber material, so that the fiber material has the advantages that the fiber material can be recycled, and the cost is reduced. The fiber material forms a three-dimensional network framework in a formed brick body, so that the strength performance of the autoclaved fly ash-lime brick for the building is effectively improved.

Description

Technical Field

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

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

[0003] In the prior art, the activity of fly ash, the raw material of autoclaved fly ash bricks, is unstable and the composition fluctuates greatly, which easily leads to an insufficiently dense internal structure of the bricks and affects the strength performance of the bricks. Based on this, the present invention provides an autoclaved fly ash brick for construction and a manufacturing method thereof. Summary of the Invention

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

[0005] To achieve the above purpose, the present invention provides the following technical solutions: In the first aspect, the present invention provides an autoclaved fly ash brick for construction, which comprises the following raw materials in parts by weight: 60 - 80 parts of fly ash, 20 - 40 parts of carbide slag, 10 - 20 parts of a first filler, 10 - 20 parts of river sand, 8 - 12 parts of a foaming agent, 8 - 12 parts of a second filler, 6 - 10 parts of silicon dioxide, and 6 - 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 vermiculite, sepiolite, metakaolin, and zeolite is 1:(2 - 3):(3 - 4):(0.4 - 0.8).

[0006] Further, the fiber material is prepared by the following method: The fiber material selects chicken feathers recycled from factories as raw materials. After the chicken feathers are recycled, they are soaked and rinsed, and then sent into an oven. The oven is set for drying treatment at 40 - 50 °C for 2 - 4 h. The dried chicken feathers are pulverized to form a powder, and the particle size of the powder is 20 - 80 μm.

[0007] Further, the powder material is immersed in a mixed solution of ethanol and ether, the mass ratio of ethanol to ether is 1:1, the soaking time is 10 - 20 min. After soaking, the obtained product is added to a water bath, and a treatment solution is added to the water bath. The mass of the treatment solution is 120 - 140% of the mass of the product obtained after soaking. The water bath is set to heat up to 80 - 90 °C and keep the temperature for 2 - 4 h to obtain a first mixed solution. The first mixed solution is allowed to stand and cool, and a second mixed solution is added to the first mixed solution to obtain a third mixed solution. The mass of the second mixed solution is 60 - 70% of the mass of the first mixed solution. The third mixed solution is injected into an electrospinning machine, the voltage of the electrospinning machine is set to 16 - 20 kV, the temperature is 40 - 44 °C, and the product obtained by electrospinning is subjected to a cutting treatment with a cutting length of 2 - 4 mm to obtain a fiber material.

[0008] Further, the treatment solution is prepared by mixing sodium bisulfate, sodium dodecyl sulfate, urea and deionized water, and the mass ratio of sodium bisulfate, sodium dodecyl sulfate, urea and deionized water is 1:(0.6 - 0.8):(3 - 5):(4 - 7).

[0009] Further, the second mixed solution is a mixture of polyacrylonitrile and dimethylacetamide, and the mass ratio of polyacrylonitrile to dimethylacetamide is 1:1.2.

[0010] Further, the first filler is prepared by the following method: The fiber material and cement are added to a mixer, water is added to the mixer, the mass of the water is 2 - 3 times the mass of the cement, the mixer is set to stir at 400 - 500 r / min for 6 - 10 min, and plant ash is added during the stirring process to obtain the first filler.

[0011] Further, the vermiculite, sepiolite, metakaolin, and zeolite are all selected in powder form with a powder particle size of 20 - 60 μm, and the silica is selected in powder form with a powder particle size of 10 - 20 μm.

[0012] Further, the second filler is prepared by the following method: Vermiculite, sepiolite, metakaolin, and zeolite are added to a mixer, silica is added to the mixer, and the mixer is set to stir at 800 - 1000 r / min for 40 - 50 min to obtain the second filler.

[0013] Further, the cement is selected as Portland cement.

[0014] In a second aspect, the present invention provides a preparation method of autoclaved fly ash bricks for construction, comprising the following steps: S1: Weigh fly ash, carbide slag, the first filler, river sand, foaming agent, the second filler and gypsum as required and add them into a mixer. The mixer is set to stir at 400 - 500 r / min for 20 - 30 min to obtain a preliminary mixture. Water is added to the preliminary mixture, and the mass of the water is 10 - 20% of the mass of the mixed materials in the mixer. The mixer is set to stir at 200 - 300 r / min for 50 - 60 min and then left to age for 6 - 10 d to obtain a mixture. S2: Pour the mixture into a mold to form a blank. The blank is sent into an autoclave. After the autoclave is evacuated, the temperature is set to 160 - 220 °C and the pressure is set to 10 - 16 MPa. It is subjected to heat preservation and pressure maintenance for 12 - 16 h, and then the steam is discharged. After cooling, it is left to stand for 25 - 35 d to obtain autoclaved fly ash bricks for construction.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, during the preparation process of autoclaved fly ash bricks for construction, by adding the first filler, the first filler uses chicken feathers which are rich in keratin. Through the mixed treatment of ethanol and ether, the surface impurities of the chicken feathers can be removed, and the complete fiber structure of keratin can be retained. Sodium dodecyl 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 unfolding of keratin molecular chains and increase the binding sites with inorganic materials. After electrospinning treatment, keratin can be compounded with polyacrylonitrile to form a fiber material. This fiber material forms a three-dimensional network skeleton in the formed brick body, effectively improving the strength performance of autoclaved fly ash bricks for construction.

[0016] 2. In the present invention, during the preparation process of autoclaved fly ash bricks for construction, by adding the second filler, there is a certain amount of air between the layers of vermiculite in the second filler. The fibrous structure of sepiolite and the porous structure of zeolite can effectively prevent heat transfer, so that the autoclaved fly ash bricks can have good heat 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 autoclaved fly ash bricks for construction. Specific embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] It should be noted that the raw materials used in the following embodiments are all commercially available raw materials.

[0019] Example 1:

[0020] An autoclaved fly ash brick for construction, comprising raw materials in the following parts by weight: 60 parts of fly ash, 20 parts of carbide slag, 10 parts of first filler, 10 parts of river sand, 8 parts of foaming agent, 8 parts of second filler, 6 parts of silica, and 6 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):(0.4); 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).

[0021] The fiber material is prepared by the following method: The fiber material selects the chicken feathers recycled by the factory as raw materials. After the chicken feathers are recycled, they are soaked and rinsed, and then sent into an oven. The oven is set to dry at 40°C for 2 hours. The dried chicken feathers are crushed to make a powder, and the particle size of the powder is 20μm.

[0022] The powder is immersed in a mixed solution of ethanol and ether, and the mass ratio of ethanol and ether is 1:1. The soaking time is 10 minutes. The product obtained after soaking is added to a water bath pot, and a treatment solution is added to the water bath pot. The mass of the treatment solution is 120% of the mass of the product obtained after soaking. The water bath pot is set to heat up to 80°C and keep the temperature for 2 hours to obtain a first mixed solution. The first mixed solution is allowed to stand and cool. A second mixed solution is added to the first mixed solution to obtain a third mixed solution. The mass of the second mixed solution is 60% of the mass of the first mixed solution. The third mixed solution is injected into an electrospinning machine. The electrospinning machine is set with a voltage of 16 kV and a temperature of 40°C. The product obtained by electrospinning is cut, and the cutting length is 2 mm to obtain the fiber material.

[0023] The treatment solution is prepared by mixing sodium bisulfate, sodium dodecyl sulfate, urea, and deionized water, and the mass ratio of sodium bisulfate, sodium dodecyl sulfate, urea, and deionized water is 1:(0.6):(3):(4).

[0024] The second mixed solution is a mixture of polyacrylonitrile and dimethylacetamide, and the mass ratio of polyacrylonitrile and dimethylacetamide is 1:1.2.

[0025] The first filler is prepared by the following method: The fiber material and cement are added to a mixer, and water is added to the mixer. The mass of the water is 2 times the mass of the cement. The mixer is set to stir at 400 r / min for 6 minutes, and plant ash is added during the stirring process to obtain the first filler.

[0026] Vermiculite, sepiolite, metakaolin, and zeolite are all selected in powder form, and the powder particle size is 20μm. Silica is selected in powder form, and the powder particle size is 10μm.

[0027] The second filler is prepared by the following method: Vermiculite, sepiolite, metakaolin, and zeolite are added to a mixer, and silica is added to the mixer. The mixer is set to stir at 800 r / min for 40 min to obtain the second filler.

[0028] Portland cement is selected as the cement.

[0029] A preparation method of autoclaved fly ash bricks for construction includes the following steps: S1: Weigh fly ash, carbide slag, the first filler, river sand, foaming agent, the second filler, and gypsum as required and add them to a mixer. The mixer is set to stir at 400 r / min for 20 min to obtain a preliminary mixture. Water is added to the preliminary mixture, and the mass of water is 10% of the mass of the mixed materials in the mixer. The mixer is set to stir at 200 r / min for 50 min and then left to age for 6 d to obtain a mixed material. S2: The mixed material is poured into a mold to form a blank. The blank is sent into an autoclave. After the autoclave is evacuated, the temperature is set to 160 °C and the pressure is set to 10 MPa. It is heat-insulated and pressure-maintained for 12 h, and then the steam is discharged. After cooling, it is left to stand for 25 d to obtain autoclaved fly ash bricks for construction.

[0030] Example 2:

[0031] An autoclaved fly ash brick for construction includes the following raw materials by weight: 70 parts of fly ash, 30 parts of carbide slag, 15 parts of the first filler, 15 parts of river sand, 10 parts of foaming agent, 10 parts of the second filler, 8 parts of silica, and 8 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:(0.7):(0.5); 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).

[0032] The fiber material is prepared by the following method: The fiber material selects chicken feathers recycled from the factory as raw materials. After the chicken feathers are recycled, they are soaked and rinsed, and then sent into an oven. The oven is set to dry at 45 °C for 3 h. The dried chicken feathers are pulverized to form a powder, and the particle size of the powder is 50 μm.

[0033] The powder is immersed in a mixed solution of ethanol and ether. The mass ratio of ethanol to ether is 1:1, and the soaking time is 15 min. The product obtained after soaking is added to a water bath. A treatment solution is added to the water bath, and the mass of the treatment solution is 130% of the mass of the product obtained after soaking. The water bath is set to heat up to 85 °C and keep the temperature for 3 h to obtain a first mixed solution. The first mixed solution is allowed to stand and cool. A second mixed solution is added to the first mixed solution to obtain a third mixed solution. The mass of the second mixed solution is 65% of the mass of the first mixed solution. The third mixed solution is injected into an electrospinning machine. The electrospinning machine is set with a voltage of 18 kV and a temperature of 42 °C. The product obtained by electrospinning is subjected to slitting treatment, and the slitting length is 3 mm to obtain a fiber material.

[0034] The treatment solution is prepared by mixing sodium bisulfate, sodium dodecyl sulfate, urea, and deionized water. The mass ratio of sodium bisulfate, sodium dodecyl sulfate, urea, and deionized water is 1:(0.7):(4):(5).

[0035] The second mixed solution is a mixture of polyacrylonitrile and dimethylacetamide. The mass ratio of polyacrylonitrile to dimethylacetamide is 1:1.2.

[0036] The first filler is prepared by the following method: The fiber material and cement are added to a mixer. Water is added to the mixer, and the mass of water is 2.5 times the mass of the cement. The mixer is set to stir at 450 r / min for 8 min. During the stirring process, plant ash is added to obtain the first filler.

[0037] Vermiculite, sepiolite, metakaolin, and zeolite are all selected in powder form, and the powder particle size is 40 μm. Silicon dioxide is selected in powder form, and the powder particle size is 15 μm.

[0038] 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. The mixer is set to stir at 900 r / min for 45 min to obtain the second filler.

[0039] Portland cement is selected as the cement.

[0040] A preparation method of autoclaved fly ash bricks for construction includes the following steps: S1: Weigh fly ash, carbide slag, the first filler, river sand, foaming agent, the second filler, and gypsum as required and add them to a mixer. The mixer is set to stir at 450 r / min for 25 min to obtain a preliminary mixed material. Water is added to the preliminary mixed material, and the mass of water is 15% of the mass of the mixed materials in the mixer. The mixer is set to stir at 250 r / min for 55 min and then stand for aging for 8 d to obtain a mixed material; S2: The mixture is poured into a mold to form a blank. The blank is fed into an autoclave. After the autoclave is evacuated, the set temperature is 190°C and the pressure is 13 MPa. It is subjected to heat and pressure preservation treatment for 14 h. Then the steam is discharged. After cooling, it is left standing for 30 d to obtain autoclaved fly ash bricks for construction.

[0041] Example 3:

[0042] An 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 the first filler, 20 parts of river sand, 12 parts of foaming agent, 12 parts of the second filler, 10 parts of silicon dioxide, 10 parts of gypsum; The raw materials of the first filler are composed of fiber material, cement, and plant ash. The mass ratio of the fiber material, cement, and plant ash is 1:(0.8):(0.6); The raw materials of the second filler are composed of vermiculite, sepiolite, metakaolin, and zeolite. The mass ratio of vermiculite, sepiolite, metakaolin, and zeolite is 1:(3):(4):(0.8).

[0043] The fiber material is prepared by the following method: The fiber material selects chicken feathers recycled by the factory as raw materials. After the chicken feathers are recycled, they are soaked and rinsed. Then they are fed into an oven. The oven is set at 50°C for drying treatment for 4 h. The dried chicken feathers are pulverized to form a powder. The particle size of the powder is 80 μm.

[0044] The powder is immersed in a mixed solution of ethanol and ether. The mass ratio of ethanol and ether is 1:1. The soaking time is 20 min. After soaking, the obtained product is added to a water bath. A treatment solution is added to the water bath. The mass of the treatment solution is 140% of the mass of the product obtained after soaking. The water bath is set to heat up to 90°C and keep the temperature for reaction for 4 h to obtain a first mixed solution. The first mixed solution is left standing and cooled. A second mixed solution is added to the first mixed solution to obtain a third mixed solution. The mass of the second mixed solution is 70% of the mass of the first mixed solution. The third mixed solution is injected into an electrospinning machine. The electrospinning machine is set with a voltage of 20 kV and a temperature of 44°C. The product obtained by electrospinning is subjected to cutting treatment. The cutting length is 4 mm to obtain the fiber material.

[0045] The treatment solution is prepared by mixing sodium bisulfate, sodium dodecyl sulfate, urea, and deionized water. The mass ratio of sodium bisulfate, sodium dodecyl sulfate, urea, and deionized water is 1:(0.8):(5):(7).

[0046] The second mixed solution is a mixture of polyacrylonitrile and dimethylacetamide. The mass ratio of polyacrylonitrile and dimethylacetamide is 1:1.2.

[0047] The first filler is prepared by the following method: Fiber material and cement are added into a mixer, water is added into the mixer, the mass of water is 3 times that of cement, the mixer is set to stir at 500 r / min for 10 min, and plant ash is added during the stirring process to obtain the first filler.

[0048] Vermiculite, sepiolite, metakaolin, and zeolite are all selected in powder form with a powder particle size of 60 μm, and silica is selected in powder form with a powder particle size of 20 μm.

[0049] The second filler is prepared by the following method: Vermiculite, sepiolite, metakaolin, and zeolite are added into a mixer, silica is added into the mixer, the mixer is set to stir at 1000 r / min for 50 min to obtain the second filler.

[0050] Portland cement is selected as the cement.

[0051] A preparation method of autoclaved fly ash bricks for construction includes the following steps: S1: Weigh fly ash, carbide slag, the first filler, river sand, foaming agent, the second filler, and gypsum as required and add them into a mixer. The mixer is set to stir at 500 r / min for 30 min to obtain a preliminary mixture. Water is added to the preliminary mixture, and the mass of water is 20% of the mass of the mixed materials in the mixer. The mixer is set to stir at 300 r / min for 60 min and then left to age for 10 d to obtain a mixed material. S2: The mixed material is poured into a mold to form a blank. The blank is sent into an autoclave. After the autoclave is evacuated, the temperature is set to 220 °C and the pressure is set to 16 MPa, and it is subjected to heat and pressure preservation treatment for 16 h. Then the steam is discharged, and after cooling, it is left to stand for 35 d to obtain autoclaved fly ash bricks for construction.

[0052] Comparative Example 1: The difference between this comparative example and Example 1 is that in this comparative example, an equal amount of cement is selected to replace the second filler.

[0053] Comparative Example 2: The difference between this comparative example and Example 1 is that in this comparative example, an equal amount of cement is selected to replace the first filler.

[0054] Comparative Example 3: The difference between this comparative example and Example 1 is that in this comparative example, the second filler is not included.

[0055] Comparative Example 4: The difference between this comparative example and Example 1 is that in this comparative example, the first filler is not included.

[0056] Performance test: Performance tests are carried out 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, and the obtained test data are recorded in the following table:

[0057] It can be seen that the flexural strength and compressive strength of the autoclaved fly ash bricks prepared in Comparative Examples 1, 2, 3, and 4 are lower than those in Examples 1, 2, and 3. This shows that: during the preparation of autoclaved fly ash bricks for construction, by adding the first filler, and taking advantage of the rich keratin in chicken feathers in the first filler, the surface impurities of chicken feathers can be removed through the mixed treatment of ethanol and ether, and the complete fiber structure of keratin can be retained. Sodium dodecyl sulfate in the treatment solution can improve the interfacial bonding strength between the fiber and the cement matrix. As a hydrogen bond breaker, urea can promote the unfolding of keratin molecular chains and increase the binding sites with inorganic materials. After electrospinning treatment, keratin can be compounded with polyacrylonitrile 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 bricks for construction. By adding the second filler during the preparation of autoclaved fly ash bricks for construction, there is a certain amount of air between the layers of vermiculite in the second filler, and the fibrous structure of sepiolite and the porous structure of zeolite can effectively prevent heat transfer, so that the autoclaved fly ash bricks can have good heat 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 bricks for construction.

[0058] By comparing and analyzing the relevant data in the table, it can be known that the autoclaved fly ash bricks prepared by the present invention not only have good flexural strength performance, but also have excellent compressive strength performance. This shows that the autoclaved fly ash bricks provided by the present invention have a broader market prospect and are more suitable for promotion.

[0059] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0060] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not elaborate all the details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An autoclaved fly ash brick for construction, characterized in that: It includes the following raw materials in parts by weight: 60-80 parts of fly ash, 20-40 parts of carbide slag, 10-20 parts of the first filler, 10-20 parts of river sand, 8-12 parts of foaming agent, 8-12 parts of the second filler, 6-10 parts of silica, and 6-10 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 vermiculite, sepiolite, metakaolin, and zeolite is 1:(2-3):(3-4):(0.4-0.8).

2. The autoclaved fly ash brick for construction according to claim 1, characterized in that, The fiber material is prepared by the following method: The fiber material selects chicken feathers recycled from the factory as raw materials. After the chicken feathers are recycled, they are soaked and rinsed, and then sent into an oven. The oven is set at 40-50°C for drying treatment for 2-4 hours. The dried chicken feathers are pulverized to make powder, and the particle size of the powder is 20-80μm.

3. The autoclaved fly ash brick for construction according to claim 2, characterized in that, The powder is immersed in a mixed solution of ethanol and ether. The mass ratio of ethanol and ether is 1:1, and the soaking time is 10-20 minutes. The product obtained after soaking is added to a water bath pot, and a treatment solution is added to the water bath pot. The mass of the treatment solution is 120-140% of the mass of the product obtained after soaking. The water bath pot is set to heat up to 80-90°C and keep warm for reaction for 2-4 hours to obtain a first mixed solution. The first mixed solution is allowed to stand and cool, and a second mixed solution is added to the first mixed solution to obtain a third mixed solution. The mass of the second mixed solution is 60-70% of the mass of the first mixed solution. The third mixed solution is injected into an electrospinning machine. The electrospinning machine is set with a voltage of 16-20 kV and a temperature of 40-44°C. The product obtained by electrospinning is cut, and the cutting length is 2-4 mm to obtain the fiber material.

4. The autoclaved fly ash brick for construction according to claim 3, wherein The treatment solution is prepared by mixing sodium bisulfate, sodium dodecyl sulfate, urea, and deionized water. The mass ratio of sodium bisulfate, sodium dodecyl sulfate, urea, and deionized water is 1:(0.6-0.8):(3-5):(4-7).

5. The autoclaved fly ash brick for construction according to claim 3, characterized in that, The second mixed solution is a mixture of polyacrylonitrile and dimethylacetamide, and the mass ratio of polyacrylonitrile and dimethylacetamide is 1:1.

2.

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

7. The autoclaved fly ash brick for construction according to claim 1, wherein Both vermiculite, sepiolite, metakaolin, and zeolite are selected in powder form, and the powder particle size is 20-60μm. Silica is selected in powder form, and the powder particle size is 10-20μm.

8. The autoclaved fly ash brick for construction according to claim 1, characterized in that, The second filler is prepared by the following method: Vermiculite, sepiolite, metakaolin, and zeolite are added to a mixer, and silica is added to the mixer. The mixer is set at 800-1000 r / min for stirring treatment for 40-50 minutes to obtain the second filler.

9. The autoclaved fly ash brick for construction according to claim 1, wherein The cement selects Portland cement.

10. A preparation method of the autoclaved fly ash brick for construction according to any one of claims 1 to 9, characterized in that, It includes the following steps: S1: Weigh fly ash, carbide slag, the first filler, river sand, foaming agent, the second filler and gypsum as required and add them into a mixer. The mixer is set to stir at 400 - 500 r / min for 20 - 30 min to obtain a preliminary mixture. Water is added to the preliminary mixture, and the mass of the water is 10 - 20% of the mass of the mixed materials in the mixer. The mixer is set to stir at 200 - 300 r / min for 50 - 60 min and then left to age for 6 - 10 d to obtain a mixture. S2: Pour the mixture into a mold to form a blank. The blank is sent into an autoclave. After the autoclave is evacuated, the temperature is set to 160 - 220 °C and the pressure is set to 10 - 16 MPa. It is subjected to heat and pressure preservation treatment for 12 - 16 h, and then the steam is discharged. After cooling, it is left to stand for 25 - 35 d to obtain autoclaved fly ash bricks for construction.

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