CN115611654A - Aerated concrete and preparation method thereof - Google Patents
Aerated concrete and preparation method thereof Download PDFInfo
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- CN115611654A CN115611654A CN202110786746.XA CN202110786746A CN115611654A CN 115611654 A CN115611654 A CN 115611654A CN 202110786746 A CN202110786746 A CN 202110786746A CN 115611654 A CN115611654 A CN 115611654A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
Abstract
The invention discloses aerated concrete and a preparation method thereof, belongs to the technical field of building materials, and solves the problems of complex process, high production cost and large quality fluctuation in the prior art. The aerated concrete comprises the following raw materials: low-carbon cementing material: 15-35 parts of waste slurry: 0-35 parts, slurry: 45-80 parts of water: 4-6 parts of aluminum paste powder: 0.2 to 0.7 portion. The mineral composition of the low-carbon cementing material is as follows: f-CaO 30-45 wt%,
3～15wt.％、C 2 S 35～55wt.％；CaSO 4 0.1～10wt.％、C 4 AF 0.1-8 wt.%. The preparation method comprises the following steps: weighing the raw materials in proportion, mixing and stirring uniformly, pouring into a mold, standing for maintenance, demolding,cutting, steaming, and taking out. The aerated concrete block has the advantages that the air holes are uniformly distributed, the volume weight and the strength are good, and the performance of the aerated concrete block is effectively improved; the invention adopts the low-carbon cementing material as the main raw material of the aerated concrete, can solve the fluctuation of various materials, simplifies the production process and ensures the stability of products.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to aerated concrete and a preparation method thereof.
Background
The aerated concrete block is porous silicate concrete which is prepared by taking cement, lime, sand (fly ash, stone powder and the like), aluminum paste, an additive and the like as raw materials and performing the working procedures of ball milling, metering, stirring and pouring, gas generation and expansion, standing, cutting, autoclaved curing and the like. In AAC plates, ACB blocks, matched masonry mortar and the like in the prior art, prefabricated parts of the AAC plates, the ACB blocks, the matched masonry mortar and the like are mainly aerated concrete. The aerated concrete has excellent heat preservation and heat insulation performance, is used for constructing a self-insulation wall, and has convenient construction and lower cost.
Lime and cement can be used as calcareous materials to produce aerated concrete, but both have some disadvantages. Lime is used as a single calcareous material, the hardening characteristics and the digestion characteristics of the lime cannot be effectively supplemented and adjusted, and the quality of the product cannot be conveniently controlled; the cement is used as a single calcareous material, the optimum dosage is 35-40%, the dosage is large, the cost is high, the blank is slowly hardened, and the strength is low. Generally, the blank is usually hardened at a high speed in the initial stage and at a low speed in the later stage, the strength of the blank is low, the standing time is long, and the blank is difficult to adapt to mechanical cutting; and as the lime has larger quality fluctuation, the lime is difficult to control when being used as a single calcareous material. In the pouring process of the cement-lime-sand aerated concrete, the gypsum has obvious delaying effect on the digestion of lime, so that the thickening speed of slurry is reduced, the temperature of the slurry rises smoothly, the thickening time of the slurry is prolonged, and a good air hole structure is ensured. However, when the amount of gypsum is too large, the thickening speed of the slurry is too slow, which may cause problems such as bubbling, sinking, and die collapse. Currently, the mainstream aerated concrete is still produced by using a cement-lime-sand mode, and the product has the following problems: first, further improvement in strength and enlargement of the range of application are required. Because the strength of aerated concrete is low and the drying shrinkage rate is large, the application range of the aerated concrete is limited at present. Although the autoclaved aerated concrete can reach the grade of A5.0, the autoclaved aerated concrete reaching the strength grade has poor quality stability due to over high cost or large volume density. Secondly, the production raw materials are numerous and do not conform to the principle of conciseness. Besides silica sand and aluminum powder, production raw materials need cement, lime, gypsum and the like. Cement and lime are indispensable raw materials in aerated concrete, and the production process needs to be continuously adjusted because different components of raw materials in batches fluctuate in the production process; compared with a cement dry production line, the lime production process is lagged behind, the production energy consumption is high, and the environment-friendly low-carbon policy is not met. Thirdly, the process flow is longer, and the energy consumption in the production process is increased.
Therefore, the aerated concrete provided by the invention has the advantages of simple process, low production cost, small raw material fluctuation and high and stable finished product quality, and becomes a problem to be solved by technical personnel in the field.
Disclosure of Invention
One of the purposes of the invention is to provide aerated concrete, which solves the problems of complex process, high production cost and large quality fluctuation in the prior art.
The invention also aims to provide a preparation method of the aerated concrete.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention relates to aerated concrete which is prepared from the following raw materials in parts by weight: low-carbon cementing material: 15 to 35 portions of the total weight of the mixture,
slurry slugs: 0 to 35 parts of (A) to (B),
slurry: 45-80 parts of (A) and (B),
water: 4 to 6 portions of the mixture of the components,
aluminum paste powder: 0.2 to 0.7 portion.
In some embodiments of the present invention, the low carbon cementitious material has a mineral composition of: : f-CaO: 24-40 wt.%, C 2 S：30～55wt.％，
1～20wt.％，C 4 AF：0.1～10wt.％，CaSO 4 ：0.1～10wt.％。
In some embodiments of the invention, the specific surface area of the low-carbon cementing material is 280-600 m 2 /kg。
The low-carbon cementing material comprises free calcium oxide (f-CaO) and C 2 S and a small amount of anhydrous calcium sulphoaluminate, wherein the content of free calcium oxide is higher. In the prior art, free calcium oxide is regarded as a harmful component in all cement varieties, and the content of f-CaO is reduced as much as possible in the selection of raw materials and the preparation process of products. The invention utilizes the characteristic that the f-CaO reacts with water to generate calcium hydroxide and release a large amount of heat, and creatively adopts the high-content f-CaO, so that when the aerated concrete is prepared, the high-content f-CaO can release a large amount of heat in the reaction process, thereby being beneficial to the calcium-silicon hydrothermal synthesis reaction and promoting the gas generation of the aluminum powder gas former.
The invention also contains a small amount of early strength mineral calcium sulphoaluminate
The aerated concrete curing agent can promote the aerated concrete to be cured quickly, meets the curing requirement of products, is superior to the curing requirement of common portland cement, is easier to demould the products, and improves the working efficiency.
The invention also contains dicalcium silicate, which is beneficial to the stable increase of the later strength of the aerated concrete product; in the present invention, a proper amount of calcined CaSO 4 The thickening process of the aerated concrete can be adjusted, and the quality of products can be adjusted.
In some embodiments of the invention, the slurry is a mixed slurry of sand, gypsum and water; the mass ratio of the sand to the gypsum to the water is 0.8-1.2: 0.01 to 0.05:0.8 to 1.2, preferably 1:0.03:1.
in some embodiments of the invention, the SiO in the sand 2 The content is more than or equal to 80 percent, and the granularity is 100 to 300 meshes.
In some embodiments of the present invention, the waste slurry is a mixed slurry of leftover materials of aerated concrete and water, and the water content in the waste slurry is 40-65 wt.%.
The preparation method of the aerated concrete provided by the invention comprises the following steps: weighing the raw materials in proportion, mixing and stirring uniformly, pouring into a mold, standing for curing, demolding, cutting, autoclaving and taking out of the kettle to obtain the product.
In some embodiments of the invention, the uniformly mixed raw materials are poured into a mold, then a reinforcing mesh is added according to the design requirement, and then the mixture is stood still for maintenance;
preferably, after the uniformly mixed raw materials are poured into a mold, a steam tamping bar is used for carding for 1-2 times, and then a reinforcing mesh is added.
In some embodiments of the present invention, the static maintenance parameters are: standing and maintaining for 2-3 hours at 40-60 ℃.
In some embodiments of the invention, the autoclaving is curing at a vapor pressure of 0.9 to 1.2MPa and a temperature of 183 to 200 ℃ for 7 to 9 hours.
In some embodiments of the invention, after the static maintenance, the excess leftover materials and water are prepared into the waste slurry and used for preparing the aerated concrete block next time.
Compared with the prior art, the invention has the following beneficial effects:
the aerated concrete block has the advantages of scientific design and ingenious conception, and the aerated concrete block has uniform air hole distribution, good volume weight and strength, and effectively improves the performance of the aerated concrete block.
The invention adopts the low-carbon cementing material as the main raw material of the aerated concrete, can solve the problem of fluctuation of various materials, simplifies the production process and ensures the stability of products. The low-carbon cementing material adopts free calcium oxide and C 2 S, the anhydrous calcium sulphoaluminate system has high content of free calcium oxide, so that the system can quickly react with water to form calcium hydroxide when preparing aerated concrete, releases a large amount of heat in the reaction process, is favorable for the hydrothermal synthesis reaction of calcium and silicon, and promotes the aluminum powderThe gas-forming agent is used for forming gas; the calcium sulphoaluminate can promote the aerated concrete to be quickly set and hardened; the invention also contains dicalcium silicate, which is beneficial to the stable increase of the later strength of the aerated concrete product; the anhydrous calcium sulphoaluminate can adjust the thickening process of the aerated concrete and the quality of products. The components of the invention act together, which is beneficial to improving the performance of the aerated concrete block.
The preparation method is simple, is simple and convenient to operate, can effectively reduce the production cost, and is more environment-friendly and energy-saving. The low-carbon cementing material adopted by the invention is 5-10% less than the traditional cementing materials (lime, cement and gypsum); and the redundant leftover materials generated in the production process can be fully utilized, the maximum doping amount of the waste slurry can reach 35 percent, and the waste treatment problem in the production process is solved, so that the environment-friendly and energy-saving effects are realized.
The performance index of the aerated concrete is superior to that of the traditional aerated concrete. The compressive strength of the product produced by the aerated concrete preparation process is more than or equal to 5.0MPa, and the size, drying shrinkage, frost resistance, heat conductivity coefficient and the like meet the requirements of GB/T15762-2020 autoclaved aerated concrete slabs and GB/T11968-2020 autoclaved aerated concrete blocks on A5.0 of superior products.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be further illustrated by the following specific examples, but it should not be construed that the scope of the present invention is limited to the following examples, and it will be apparent to those skilled in the art that various technical features in the following examples can be appropriately combined, replaced, adjusted, modified, etc. according to the inventive concept and the entire contents of the present invention, and still fall within the scope of the protection of the present invention.
The mineral composition of the cementing material prepared in the embodiment of the invention is tested by an X-ray diffractometer (XRD), and quantitative analysis is carried out by TOPAS quantitative analysis software.
Example 1
The embodiment discloses preparation of a low-carbon cementing material, and the low-carbon cementing material is prepared from the following raw materials in percentage by mass: 85% of carbide slag, 1% of sandstone, 10% of bauxite and 4% of desulfurized gypsum.
Silicon content of sandstone 82wt. -%)
The aluminum content of the bauxite is 41wt. -%)
Content of calcium oxide in carbide slag of 50wt. -%)
The preparation method of the low-carbon cementing material comprises the following steps:
preparing materials: crushing and grinding the raw materials, mixing the raw materials,
low-temperature calcination: and calcining the mixed materials at the temperature of 1245 ℃ for 30min, and cooling to obtain the cementing material.
The mineral composition of the low-carbon cementing material prepared by the embodiment is f-CaO:38 percent; c 2 S：50％；C 4 A 3 S：8％；C 4 AF：2％；CaSO 4 :2 percent. (ii) a The specific surface area is 350m 2 /kg。
Example 2
The embodiment discloses preparation of a low-carbon cementing material, and the low-carbon cementing material is prepared from the following raw materials in percentage by mass: 79% of limestone, 5% of shale, 12% of low-grade bauxite and 4% of phosphogypsum.
Wherein the limestone contains calcium oxide in an amount of 49wt.%;
silicon content of shale 63wt.%;
the low grade bauxite contains 45wt.% of aluminum.
The preparation method of the low-carbon cementing material comprises the following steps:
preparing materials: crushing and grinding the raw materials, mixing,
low-temperature calcination: and calcining the mixed materials at 1200 ℃ for 90min, and cooling to obtain the cementing material.
The mineral composition of the low-carbon cementing material prepared by the embodiment is f-CaO:34 percent; c 2 S：46％；C 4 A 3 S：13％；C 4 AF：5％；CaSO 4 :2 percent; the specific surface area is 350m 2 /kg。
Example 3
The embodiment discloses preparation of aerated concrete, and the aerated concrete is prepared from the following raw materials in percentage by mass:
low-carbon cementing material: 17 percent; slurry slugs: 28 percent; slurry: 50 percent; water: 4.3 percent; aluminum paste powder: 0.7 percent.
Wherein the low-carbon cementing material is prepared by the method of the embodiment 1;
the water content of the slugs was such that,
in the slurry, the mass ratio of sand to gypsum to water is (1: 0.03)
SiO in sand 2 The content is more than or equal to 80 percent, and the granularity is 100-300 meshes.
The preparation method comprises the following steps:
a. according to the raw material proportioning scheme, firstly, putting water into a stirrer, and stirring the slurry for 2 minutes; stirring the waste for 2 minutes; stirring the low-carbon cementing material for 1 minute; then adding aluminum paste powder and stirring for 2 minutes; pouring into a mould.
b. And (5) carding for 1 time by using a steam tamper after the pouring is finished.
c. And pushing the cast mould into a static curing room with the ambient temperature of 40 ℃, and statically curing for 2.5 hours.
d. And cutting the blank after standing into building blocks with different specifications according to actual production requirements.
e. After cutting, the mixture is sent into an autoclave for curing for 8 hours in the autoclave with the steam pressure of 1.1MPa and the temperature of 195 ℃.
The technical test results of the produced aerated concrete are shown in the table:
TABLE 1
Example 4
The embodiment discloses preparation of aerated concrete, and the aerated concrete is prepared from the following raw materials in percentage by mass:
low-carbon cementing material: 24 percent; slurry slugs: 20 percent; slurry: 50 percent; water: 5.4 percent; aluminum paste powder: 0.6 percent.
Wherein the low-carbon cementing material is prepared by the method of the embodiment 1;
the water content of the slugs was such that,
in the slurry, the mass ratio of sand to gypsum to water is (1: 0.03)
SiO in sand 2 The content is more than or equal to 80 percent, and the granularity is 100 to 300 meshes.
The preparation method comprises the following steps:
a. according to the raw material proportioning scheme, firstly, putting water into a stirrer, and stirring the slurry for 1 minute; stirring the waste for 1 minute; stirring the low-carbon cementing material for 2 minutes; then adding aluminum paste powder and stirring for 2 minutes; pouring into a mould.
b. And (5) carding for 1 time by using a steam tamper after the pouring is finished.
c. And pushing the cast mould into a static curing room with the ambient temperature of 40 ℃. Standing and maintaining for 2 hours.
d. And cutting the blank after standing into building blocks with different specifications according to actual production requirements.
e. After cutting, the mixture is sent into an autoclave for curing for 8 hours at the steam pressure of 1.2MPa and the temperature of 193 ℃.
The technical test results of the produced aerated concrete are shown in the table:
TABLE 2
Example 5
The embodiment discloses preparation of aerated concrete, and the aerated concrete is prepared from the following raw materials in percentage by mass:
low-carbon cementing material: 23 percent; slurry: 70 percent; water: 6.5 percent; aluminum paste powder: 0.5 percent.
Wherein the low-carbon cementing material is prepared by the method of the embodiment 1;
in the slurry, the mass ratio of sand to gypsum to water is (1: 0.03)
SiO in sand 2 The content is more than or equal to 80 percent, and the granularity is 100 to 300 meshes.
The preparation method comprises the following steps:
a. according to the raw material proportioning scheme, firstly, putting water into a stirrer, and stirring the slurry for 1 minute; stirring the waste for 1 minute; stirring the low-carbon cementing material for 1 minute; adding aluminum paste powder, and stirring for 1 minute; pouring into a mould.
b. And (5) combing for 1 time by using a steam tamper after the pouring is finished.
c. And pushing the cast mould into a static curing room with the ambient temperature of 50 ℃. Standing and maintaining for 2 hours.
d. And cutting the blank after standing into building blocks with different specifications according to actual production requirements.
e. And (3) after cutting, feeding the cut mixture into an autoclave, and curing the cut mixture for 8 hours in the autoclave with the steam pressure of 1.0MPa and the temperature of 196 ℃.
The technical test results of the produced aerated concrete are shown in the table:
TABLE 3
Comparative example 1
The gelled material of the comparative example consists of the following raw materials in percentage by mass: 68% of limestone, 4% of shale, 22% of low-grade bauxite and 6% of phosphogypsum.
Wherein the limestone contains calcium oxide in an amount of 49wt.%;
silicon content of shale 63wt.%;
the low grade bauxite contains 45wt.% of aluminum.
The preparation method is the same as example 2.
The mineral composition of the prepared cementing material is f-CaO:22 percent; c 2 S：54.4％；C 4 A 3 S：15.4％；C 4 AF：5.9％；CaSO 4 ：2.4％。
Comparative example 2
The gelled material of the comparative example consists of the following raw materials in percentage by mass: 79% of limestone, 2% of shale, 13% of low-grade bauxite and 6% of phosphogypsum.
Wherein the limestone contains calcium oxide in an amount of 49wt.%;
silicon content of shale 63wt.%;
the low grade bauxite contains 45wt.% of aluminum.
The preparation method is the same as example 2.
The mineral composition of the prepared cementing material is f-CaO:40 percent; c 2 S：40.4％；C 4 A 3 S：11.4％；C 4 AF：4.4％；CaSO 4 ：3.8％。
Examples of the experiments
The cement materials of example 2 and comparative examples 1-2 were used to prepare aerated concrete blocks according to the formulation and method of example 5.
And preparing the aerated concrete block by taking sand, cement, lime, gypsum, aluminum powder paste and water as raw materials, wherein the aerated concrete block is prepared from the following raw materials in percentage by mass:
cement: 15.4 percent; lime: 9.5 percent; slurry: 50.4 percent; waste material: 18.6 percent; water: 6.1 percent; aluminum paste powder: 0.5 percent.
The method comprises the following specific steps: mixing and grinding gypsum and washed sand into slurry, wherein the mass ratio of the sand to the gypsum to the water is 1.03. Wherein the operation conditions of the steps of mould entering, standing, demoulding, cutting and autoclaving are the same as the steps B to e of the embodiment 3, and the prepared aerated concrete block is named as a comparison sample B06.
The performances of the obtained aerated concrete block are detected according to GB11968-2006 autoclaved aerated concrete block Standard, and the results are shown in the following table:
TABLE 4
As can be seen from the table above, compared with the aerated concrete block prepared by taking cement, lime, gypsum and the like as raw materials, the aerated concrete block prepared by adopting the cementing material has shorter gas generation time and standing time, and is more beneficial to production; the obtained product has better volume weight and strength and better quality.
The cement of comparative example 1, which had a lower f-CaO (22 wt.%) content, produced aerated concrete blocks having a lower volume weight and strength than the cement of example 2;
the comparative example 2 had a higher f-CaO (40 wt.%) cementitious material, and the aerated concrete block made with it also had a lower volume weight and strength than the cementitious material of example 2.
The embodiments disclosed above are supplementary examples for clear illustration and can be used as corresponding references for subsequent use. Any modifications, equivalents, improvements and the like which may occur to those skilled in the art and which are based on the foregoing teachings and may be considered in various forms are within the scope of the invention.
Claims (10)
1. The aerated concrete is characterized by being prepared from the following raw materials in parts by weight: low-carbon cementing material: 15 to 35 portions of the total weight of the mixture,
waste slurry: 0 to 35 portions of the total weight of the mixture,
slurry: 45-80 parts of (A) and (B),
water: 4 to 6 portions of the mixture of the components,
aluminum paste powder: 0.2 to 0.7 portion.
2. The aerated concrete according to claim 1, wherein the low-carbon cementing material has the following mineral composition: : f-CaO: 24-40 wt.%, C 2 S：30～55wt.％，
1～20wt.％，C 4 AF：0.1～10wt.％，CaSO 4 ：0.1～10wt.％。
3. The aerated concrete according to claim 2, wherein the specific surface area of the low-carbon cementing material is 280-600 m 2 /kg。
4. The aerated concrete according to claim 1 or 2, wherein the slurry is a mixed slurry of sand, gypsum and water; the mass ratio of the sand to the gypsum to the water is 0.8-1.2: 0.01 to 0.05:0.8 to 1.2, preferably 1:0.03:1.
5. aerated concrete according to claim 4, wherein SiO is in the sand 2 The content is more than or equal to 80 percent, and the granularity is 100 to 300 meshes.
6. The aerated concrete according to claim 1, wherein the slug is a mixed slurry of an aerated concrete leftover and water, and the water content of the slug is 40-65 wt.%.
7. A method of producing aerated concrete according to any one of claims 1 to 6, comprising the steps of: weighing the raw materials in proportion, mixing and stirring uniformly, pouring into a mould, standing for curing, demoulding, cutting, autoclaving and taking out of the kettle to obtain the product.
8. The preparation method of claim 7, wherein the uniformly mixed raw materials are poured into a mold, then a reinforcing mesh is added according to the design requirement, and then standing and curing are carried out;
preferably, after the uniformly mixed raw materials are poured into a mold, a steam tamping bar is used for carding for 1-2 times, and then a reinforcing mesh is added.
9. The method according to claim 7 or 8, wherein the static curing parameters are: standing and maintaining for 2-3 hours at 40-60 ℃.
10. The method according to claim 7 or 8, wherein the autoclaving is carried out at a vapor pressure of 0.9 to 1.2MPa and a temperature of 183 to 200 ℃ for 7 to 9 hours.
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| CN112573884A (en) * | 2020-11-13 | 2021-03-30 | 福建同利建材科技有限公司 | High-toughness alkali slag granite powder aerated concrete block and preparation method thereof |
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