CN117865628A - Steam-curing-free aerated concrete and preparation method thereof - Google Patents
Steam-curing-free aerated concrete and preparation method thereof Download PDFInfo
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- CN117865628A CN117865628A CN202311699354.5A CN202311699354A CN117865628A CN 117865628 A CN117865628 A CN 117865628A CN 202311699354 A CN202311699354 A CN 202311699354A CN 117865628 A CN117865628 A CN 117865628A
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- 239000004567 concrete Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title abstract description 14
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000010881 fly ash Substances 0.000 claims abstract description 43
- 239000000292 calcium oxide Substances 0.000 claims abstract description 41
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 41
- 239000002893 slag Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000003245 coal Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 239000010883 coal ash Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims description 29
- 238000003756 stirring Methods 0.000 claims description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 210000001161 mammalian embryo Anatomy 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 9
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 8
- 235000008429 bread Nutrition 0.000 claims description 8
- 239000001110 calcium chloride Substances 0.000 claims description 8
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 238000012258 culturing Methods 0.000 claims 2
- 239000004568 cement Substances 0.000 abstract description 10
- 239000002910 solid waste Substances 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 11
- 229910052602 gypsum Inorganic materials 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000006004 Quartz sand Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of building materials, in particular to a steam-curing-free aerated concrete and a preparation method thereof, wherein the steam-curing-free aerated concrete comprises the following components in percentage by mass: 30-47% of fly ash, 18-35% of coal gangue, 12-27% of carbide slag and 15-22% of quicklime; the coal ash gas generating device further comprises an exciting agent and a gas generating material, wherein the addition amount of the exciting agent is 2-4% of the mass of the coal ash, and the addition amount of the gas generating material is 0.08-0.1% of the sum of the mass of the coal ash, the coal gangue, the carbide slag and the quicklime. The autoclaved aerated concrete of the invention largely utilizes industrial solid waste, the mixing amount is up to more than 80%, not only can realize the resource utilization of the industrial solid waste and reduce the cost of raw materials of enterprises, but also can reduce the environmental pollution and save the use of cement; the invention replaces the high-temperature high-pressure steam curing mode with the normal-temperature normal-pressure curing mode, greatly reduces the energy consumption for curing, reduces the carbon emission, has simple preparation process, and the prepared aerated concrete has small dry density, high strength and considerable economic benefit.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to steam-curing-free aerated concrete and a preparation method thereof.
Background
The aerated concrete is a lightweight porous silicate product prepared by taking siliceous materials (sand, fly ash, siliceous tailings and the like) and calcareous materials (lime, cement) as main raw materials, adding a gas generating agent (aluminum powder), and carrying out the technological processes of proportioning, stirring, pouring, pre-curing, cutting, autoclaving, curing and the like. The aerated concrete is named because the aerated concrete contains a large number of uniform and fine air holes after being aerated. The aerated concrete has the advantages of light volume weight, high heat preservation performance, good fireproof and sound absorption effects, certain strength, workability and the like, and is one of the light wall materials which are the earliest in application and the most widely used in China.
Most of the existing aerated concrete products use cement as a main cementing material, so that mine resource consumption and ecological environment damage can be caused, and the design strength requirement can be met by high-temperature high-pressure steam curing in an autoclave, so that the production cost is high, and the production process has great potential safety hazard 。
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the steam-curing-free aerated concrete and the preparation method thereof, which not only can consume a large amount of industrial solid waste, but also can reduce the energy consumption required by curing in a steam-curing-free mode.
In order to achieve the aim, the technical scheme of the invention is that the autoclaved aerated concrete comprises the following components in percentage by mass: 30-47% of fly ash, 18-35% of coal gangue, 12-27% of carbide slag and 15-22% of quicklime; the coal ash gas generating device further comprises an exciting agent and a gas generating material, wherein the addition amount of the exciting agent is 2-4% of the mass of the coal ash, and the addition amount of the gas generating material is 0.08-0.1% of the sum of the mass of the coal ash, the coal gangue, the carbide slag and the quicklime.
Further, the effective calcium oxide content of the quicklime is more than or equal to 80 percent.
Further, the gas generating material comprises any one of aluminum powder and aluminum powder paste.
Further, the exciting agent comprises at least one of calcium chloride, aluminum sulfate, sodium sulfate and sodium hydroxide.
Further, the fineness of the carbide slag, the fly ash, the quicklime and the gangue is less than or equal to 10% of the screen residue with 200 meshes; the fly ash is secondary or primary fly ash.
The invention also provides a preparation method of the steam-curing-free aerated concrete, which comprises the following steps:
s1, weighing all the required raw materials according to the proportioning requirement;
s2, pouring the weighed fly ash, coal gangue, carbide slag, quicklime and exciting agent into required water, and fully stirring until uniform slurry is formed;
s3, adding a gas generating material solution into the slurry obtained in the step S2, and stirring uniformly again;
s4, injecting the slurry obtained in the step S3 into a die, slightly vibrating, then placing the die into a pre-curing chamber for gas generation and pre-curing, and cutting off the bread head after the embryo reaches a certain degree;
s5, placing the cut embryo body into a curing box, and curing for 18-24 hours at the temperature of 80-90 ℃ to obtain the aerated concrete.
Further, in the step S2, the water temperature is controlled to be 50+/-5 ℃, and the stirring time is 2-4min.
Further, the stirring time in step S2 is not more than 50S.
Further, the temperature of the precuring chamber in the step S4 is controlled to be 45-55 ℃ and precured for 3-5 hours.
Compared with the prior art, the invention has the following beneficial effects:
(1) The autoclaved aerated concrete of the invention largely utilizes industrial solid waste, the mixing amount is up to more than 80%, not only can realize the resource utilization of the industrial solid waste, reduce the cost of raw materials of enterprises, but also can reduce the pollution to the environment;
(2) According to the invention, through the collocation and utilization of industrial solid wastes, compared with the common aerated concrete, the use of cement is omitted, the consumption of mine resources can be effectively reduced, and the carbon emission is reduced;
(3) The invention replaces the high-temperature high-pressure steam curing mode with the normal-temperature normal-pressure curing mode, greatly reduces the energy consumption for curing, reduces the carbon emission, has simple preparation process, and the prepared aerated concrete has small dry density, high strength and considerable economic benefit.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in the following examples, and it is obvious that the described examples are only some examples of the present invention, but not all examples. Although representative embodiments of the present invention have been described in detail, those skilled in the art to which the invention pertains will appreciate that various modifications and changes can be made without departing from the scope of the invention. Accordingly, the scope of the invention should not be limited to the embodiments, but should be defined by the appended claims and equivalents thereof.
The invention provides a non-autoclaved aerated concrete which comprises the following components in percentage by mass: 30-47% of fly ash, 18-35% of coal gangue, 12-27% of carbide slag and 15-22% of quicklime; the coal ash gas generating device further comprises an exciting agent and a gas generating material, wherein the addition amount of the exciting agent is 2-4% of the mass of the coal ash, and the addition amount of the gas generating material is 0.08-0.1% of the sum of the mass of the coal ash, the coal gangue, the carbide slag and the quicklime.
Wherein the effective calcium oxide content of the quicklime is more than or equal to 80 percent. The invention uses silicon aluminum in gangue and fly ash to carry out hydration reaction with calcium hydroxide after slaked calcium carbide slag and quicklime after exciting activity by exciting agent. The calcium hydroxide generated by the quicklime in the digestion process can also be used as an exciting agent to further excite the activity of the fly ash, and the quicklime can release a large amount of heat in the digestion process, so that the reaction is facilitated. Therefore, the whole system reaction can be carried out completely only under the condition of 80-90 ℃, so that the product achieves the performance meeting the standard requirement.
The gas generating material comprises any one of aluminum powder and aluminum powder paste; the excitant comprises at least one of calcium chloride, aluminum sulfate, sodium sulfate and sodium hydroxide; the fineness of carbide slag, fly ash, quicklime and gangue is less than or equal to 10% of the screen residue of 200 meshes; the fly ash is secondary or primary fly ash.
The invention also provides a preparation method of the autoclaved aerated concrete, which comprises the following steps:
s1, weighing all the required raw materials according to the proportioning requirement;
s2, pouring the weighed fly ash, coal gangue, carbide slag, quicklime and exciting agent into required water, controlling the water temperature to be 50+/-5 ℃, and fully stirring for 2-4min until uniform slurry is formed;
s3, adding a gas generating material solution into the slurry obtained in the step S2, and stirring uniformly again, wherein the stirring time is not more than 50S;
s4, injecting the slurry obtained in the step S3 into a mould, slightly vibrating, then placing the mould into a pre-curing chamber, controlling the temperature of the pre-curing chamber to be 45-55 ℃, performing gas generation and pre-curing for 3-5 hours, and cutting off a bread head after the embryo reaches a certain degree;
s5, placing the cut embryo body into a curing box, and curing for 18-24 hours at the temperature of 80-90 ℃ to obtain the aerated concrete.
The properties of the autoclaved aerated concrete of the present invention are described in detail below by way of specific examples.
Example 1
The embodiment provides an autoclaved aerated concrete, which comprises the following components in percentage by mass: 30% of fly ash, 28% of coal gangue, 27% of carbide slag and 15% of quicklime; the additive also comprises calcium chloride and aluminum powder, wherein the addition amount of the calcium chloride is 2% of the mass of the fly ash, and the addition amount of the aluminum powder is 0.1% of the sum of the mass of the fly ash, the gangue, the carbide slag and the quicklime.
Wherein the fineness of the carbide slag, the fly ash, the quicklime and the gangue is less than or equal to 10% of the screen residue of 200 meshes; the fly ash is secondary or primary fly ash.
The preparation method of the autoclaved aerated concrete comprises the following steps:
s1, weighing all the required raw materials according to the proportioning requirement;
s2, pouring the weighed fly ash, coal gangue, carbide slag, quicklime and exciting agent into required water, controlling the water temperature at 50 ℃, and fully stirring for 3min until uniform slurry is formed;
s3, adding aluminum powder solution into the slurry obtained in the step S2, stirring uniformly again, wherein the stirring time is 40S, and the water-material ratio of the obtained slurry is 0.6;
s4, injecting the slurry obtained in the step S3 into a mould, slightly vibrating, then placing the mould into a pre-curing chamber, controlling the temperature of the pre-curing chamber to be 50 ℃, performing gas generation and pre-curing for 4 hours, and cutting off the bread head after the embryo reaches a certain degree;
and S5, placing the cut embryo body into a curing box, and curing for 18 hours at 90 ℃ to obtain the aerated concrete.
Example 2
The embodiment provides an autoclaved aerated concrete, which comprises the following components in percentage by mass: 47% of fly ash, 18% of coal gangue, 17% of carbide slag and 18% of quicklime; the additive also comprises sodium hydroxide and aluminum powder, wherein the addition amount of the sodium hydroxide is 4% of the mass of the fly ash, and the addition amount of the aluminum powder is 0.08% of the sum of the mass of the fly ash, the gangue, the carbide slag and the quicklime.
Wherein the fineness of the carbide slag, the fly ash, the quicklime and the gangue is less than or equal to 10% of the screen residue of 200 meshes; the fly ash is secondary or primary fly ash.
The preparation method of the autoclaved aerated concrete comprises the following steps:
s1, weighing all the required raw materials according to the proportioning requirement;
s2, pouring the weighed fly ash, coal gangue, carbide slag, quicklime and sodium hydroxide into required water, controlling the water temperature at 50 ℃, and fully stirring for 3min until uniform slurry is formed;
s3, adding aluminum powder solution into the slurry obtained in the step S2, stirring uniformly again, wherein the stirring time is 45S, and the water-material ratio of the obtained slurry is 0.62;
s4, injecting the slurry obtained in the step S3 into a mould, slightly vibrating, then placing the mould into a pre-curing chamber, controlling the temperature of the pre-curing chamber to be 50 ℃, performing gas generation and pre-curing for 4 hours, and cutting off the bread head after the embryo reaches a certain degree;
s5, placing the cut embryo body into a curing box, and curing for 24 hours at 80 ℃ to obtain the aerated concrete.
Example 3
The embodiment provides an autoclaved aerated concrete, which comprises the following components in percentage by mass: 31% of fly ash, 35% of coal gangue, 12% of carbide slag and 22% of quicklime; the additive also comprises calcium chloride and aluminum powder, wherein the addition amount of the calcium chloride is 2% of the mass of the fly ash, and the addition amount of the aluminum powder is 0.1% of the sum of the mass of the fly ash, the gangue, the carbide slag and the quicklime.
Wherein the fineness of the carbide slag, the fly ash, the quicklime and the gangue is less than or equal to 10% of the screen residue of 200 meshes; the fly ash is secondary or primary fly ash.
The preparation method of the autoclaved aerated concrete comprises the following steps:
s1, weighing all the required raw materials according to the proportioning requirement;
s2, pouring the weighed fly ash, coal gangue, carbide slag, quicklime and calcium chloride into required water, controlling the water temperature at 45 ℃, and fully stirring for 4min until uniform slurry is formed;
s3, adding aluminum powder solution into the slurry obtained in the step S2, stirring uniformly again, wherein the stirring time is 45S, and the water-material ratio of the obtained slurry is 0.64;
s4, injecting the slurry obtained in the step S3 into a mould, slightly vibrating, then placing the mould into a pre-curing chamber, controlling the temperature of the pre-curing chamber at 45 ℃, performing gas generation and pre-curing for 5 hours, and cutting off the bread head after the embryo reaches a certain degree;
s5, placing the cut embryo body into a curing box, and curing for 24 hours at 80 ℃ to obtain the aerated concrete.
Comparative example 1
The aerated concrete provided in comparative example 1 comprises the following components in percentage by mass: 15% of cement, 67% of quartz sand, 15% of quicklime and 3% of gypsum; the aluminum powder is 0.08% of the sum of the mass of cement, quartz sand, quicklime and gypsum.
The preparation method of the aerated concrete comprises the following steps:
s1, weighing all the required raw materials according to the proportioning requirement;
s2, pouring the weighed cement, quartz sand, quicklime and gypsum into required water, controlling the water temperature to be 50 ℃, and fully stirring for 3min until uniform slurry is formed;
s3, adding aluminum powder solution into the slurry obtained in the step S2, stirring uniformly again, wherein the stirring time is 45S, and the water-material ratio of the obtained slurry is 0.62;
s4, injecting the slurry obtained in the step S3 into a mould, slightly vibrating, then placing the mould into a pre-curing chamber, controlling the temperature of the pre-curing chamber to be 50 ℃, performing gas generation and pre-curing for 4 hours, and cutting off the bread head after the embryo reaches a certain degree;
and S5, placing the cut blank into an autoclave, and autoclaved curing for 8 hours at 180 ℃ to obtain the aerated concrete.
Comparative example 2
The aerated concrete provided in comparative example 2 comprises the following components in percentage by mass: 74% of fly ash, 14% of quicklime, 8% of cement and 4% of gypsum; also comprises aluminum powder, wherein the aluminum powder accounts for 0.1 percent of the sum of the mass of the fly ash, the quicklime, the cement and the gypsum.
The preparation method of the aerated concrete comprises the following steps:
s1, weighing all the required raw materials according to the proportioning requirement;
s2, pouring the weighed fly ash, cement, quicklime and gypsum into required water, controlling the water temperature at 50 ℃, and fully stirring for 3min until uniform slurry is formed;
s3, adding aluminum powder solution into the slurry obtained in the step S2, stirring uniformly again, wherein the stirring time is 45S, and the water-material ratio of the obtained slurry is 0.62;
s4, injecting the slurry obtained in the step S3 into a mould, slightly vibrating, then placing the mould into a pre-curing chamber, controlling the temperature of the pre-curing chamber to be 50 ℃, performing gas generation and pre-curing for 4 hours, and cutting off the bread head after the embryo reaches a certain degree;
and S5, placing the cut blank into an autoclave, and autoclaved curing for 9 hours at 180 ℃ to obtain the aerated concrete.
The cured aerated concrete of examples 1-3 and comparative examples 1-2 was dried to constant weight at 105.+ -. 5 ℃ and then tested for dry density, compressive strength, etc., and the results are shown in Table 1.
TABLE 1 Properties of the aerated concrete blocks prepared in examples 1-3 and comparative examples 1-2
As can be seen from Table 1, the aerated concretes prepared in examples 1-3 have a lower dry density and meet the strength grade requirements of Standard A3.5, compared to comparative examples 1-2. Therefore, the invention utilizes industrial solid waste as a main component to prepare the aerated concrete, which can save production resources, change waste into valuable, reduce the production cost of enterprises, improve the benefit of the enterprises, and avoid the pollution of the factory discharged waste to the environment and the land.
And the strength meeting the standard requirement can be achieved under the curing condition of 80-90 ℃ in the embodiment 1-3, and the higher strength can be achieved under the autoclaved curing condition of 180 ℃ in the comparative embodiment 1-2, so that the energy consumption in the aerated concrete curing process can be greatly reduced, and the effects of effectively saving energy and reducing emission are achieved.
Example 2 was compared to comparative example 1 with an a5.0 intensity level, but comparative example 1 had a dry density level of B07, example 2 had a dry density level of B05, and the product had a lower density. Compared with comparative example 2, examples 1-3, which are prepared from industrial solid wastes, have higher mixing amount of the solid wastes, lower dry density and higher compressive strength. Therefore, the aerated concrete provided by the invention has better performance, wider application range of products and effectively increases the competitiveness of enterprises.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention, but rather as various modifications, equivalent arrangements, improvements, etc. within the spirit and principles of the invention.
Claims (9)
1. The autoclaved aerated concrete is characterized by comprising the following components in percentage by mass: 30-47% of fly ash, 18-35% of coal gangue, 12-27% of carbide slag and 15-22% of quicklime; the coal ash gas generating device further comprises an exciting agent and a gas generating material, wherein the addition amount of the exciting agent is 2-4% of the mass of the coal ash, and the addition amount of the gas generating material is 0.08-0.1% of the sum of the mass of the coal ash, the coal gangue, the carbide slag and the quicklime.
2. The autoclaved aerated concrete of claim 1 wherein: the effective calcium oxide content of the quicklime is more than or equal to 80 percent.
3. The autoclaved aerated concrete of claim 1 wherein: the gas generating material comprises any one of aluminum powder and aluminum powder paste.
4. The autoclaved aerated concrete of claim 1 wherein: the excitant comprises at least one of calcium chloride, aluminum sulfate, sodium sulfate and sodium hydroxide.
5. The autoclaved aerated concrete of claim 1 wherein: the fineness of the carbide slag, the fly ash, the quicklime and the gangue is less than or equal to 10% of the screen residue with 200 meshes; the fly ash is secondary or primary fly ash.
6. A method for preparing the autoclaved aerated concrete as claimed in any of claims 1 to 5, characterized by comprising the following steps:
s1, weighing all the required raw materials according to the proportioning requirement;
s2, pouring the weighed fly ash, coal gangue, carbide slag, quicklime and exciting agent into required water, and fully stirring until uniform slurry is formed;
s3, adding a gas generating material solution into the slurry obtained in the step S2, and stirring uniformly again;
s4, injecting the slurry obtained in the step S3 into a die, slightly vibrating, then placing the die into a pre-curing chamber for gas generation and pre-curing, and cutting off the bread head after the embryo reaches a certain degree;
s5, placing the cut embryo body into a curing box, and curing for 18-24 hours at the temperature of 80-90 ℃ to obtain the aerated concrete.
7. The method of manufacturing according to claim 6, wherein: in the step S2, the water temperature is controlled at 50+/-5 ℃ and the stirring time is 2-4min.
8. The method of manufacturing according to claim 6, wherein: the stirring time in the step S2 is not more than 50S.
9. The method of manufacturing according to claim 6, wherein: and in the step S4, the temperature of the pre-culturing room is controlled to be 45-55 ℃ and the pre-culturing is carried out for 3-5 hours.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311699354.5A CN117865628A (en) | 2023-12-12 | 2023-12-12 | Steam-curing-free aerated concrete and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311699354.5A CN117865628A (en) | 2023-12-12 | 2023-12-12 | Steam-curing-free aerated concrete and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN117865628A true CN117865628A (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311699354.5A Pending CN117865628A (en) | 2023-12-12 | 2023-12-12 | Steam-curing-free aerated concrete and preparation method thereof |
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| Country | Link |
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| CN (1) | CN117865628A (en) |
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- 2023-12-12 CN CN202311699354.5A patent/CN117865628A/en active Pending
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