CN112521078A - Production method of autoclaved aerated concrete block and autoclaved aerated concrete block - Google Patents
Production method of autoclaved aerated concrete block and autoclaved aerated concrete block Download PDFInfo
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- CN112521078A CN112521078A CN202011519117.2A CN202011519117A CN112521078A CN 112521078 A CN112521078 A CN 112521078A CN 202011519117 A CN202011519117 A CN 202011519117A CN 112521078 A CN112521078 A CN 112521078A
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- autoclaved aerated
- aerated concrete
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
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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
- 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
Abstract
The invention discloses an autoclaved aerated concrete block and a production method thereof, relating to the technical field of autoclaved aerated concrete blocks, wherein the autoclaved aerated concrete block comprises the following raw materials in percentage by mass: 65-70% of fly ash, 18-20% of quicklime, 10-15% of cement, 1.6-2.2% of gypsum, 0.15-0.18% of aluminum powder, 0.1-0.15% of tea saponin, 0.1-0.2% of carbon fiber, 0.5-1% of nano silicon dioxide, 1-5% of silica sand, 0.2-0.5% of coal gangue and 0.6% of water-material ratio, wherein the concrete blocks are connected through inserted steel bars. According to the invention, fly ash, quicklime and cement are added as main raw materials, and gypsum, aluminum powder, tea saponin, carbon fiber, nano-silica, silica sand and coal gangue are added as additives, so that the particle size and the active substance content of the fly ash are improved, a light porous structure is formed, concrete blocks are connected through splicing steel bars, the structural strength of integral connection is ensured, and the problem of improving the strength of autoclaved aerated concrete blocks is solved.
Description
Technical Field
The invention relates to the technical field of autoclaved aerated concrete blocks, in particular to an autoclaved aerated concrete block and a production method thereof.
Background
The autoclaved aerated concrete is developed rapidly in the building material market in China in recent years, and the autoclaved aerated concrete is used for replacing clay solid bricks and is the development trend of the building material industry in China. The autoclaved aerated concrete block belongs to a novel wall material, and is a porous silicate block which is prepared by adding aluminum powder as an air-entraining agent into a mixture of a calcareous material and a siliceous material, adding water, stirring, casting, forming, inflating, precuring, cutting and curing by high-pressure steam. It features light weight, high strength, thermal insulation, sound absorption, fire-proof, sawing and planing. The composite wall is mainly used for filling external walls and isolating internal walls of frame structures and buildings with cast-in-place concrete structures, can also be used for external walls or heat-insulating composite walls of multi-layer buildings with anti-seismic ring beams, and can also be used for heat insulation and heat insulation of roofs of buildings sometimes.
Compared with clay products and other new wall materials, the autoclaved aerated concrete block has the main advantages that: the block is large, the construction is simple and convenient, the density is small, the weight is reduced, the foundation burden is reduced, the heat conductivity coefficient is small, and the self-insulation material is a good self-insulation material. The autoclaved aerated concrete block is developed vigorously, so that a large amount of land and energy can be saved, waste can be changed into valuable, the environment is purified, energy is saved, emission is reduced, and good economic and social benefits are achieved.
As the compressive strength is one of the most important indexes of the autoclaved aerated concrete block, and the influence of the porosity on the strength is the most prominent, the production method of the autoclaved aerated concrete block and the autoclaved aerated concrete block are provided.
Disclosure of Invention
Technical problem to be solved
The invention provides an autoclaved aerated concrete block and a production method thereof, which are used for solving the problem of improving the strength of the autoclaved aerated concrete block.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the autoclaved aerated concrete block comprises the following raw materials in percentage by mass: 65-70% of fly ash, 18-20% of quicklime, 10-15% of cement, 1.6-2.2% of gypsum, 0.15-0.18% of aluminum powder, 0.1-0.15% of tea saponin, 0.1-0.2% of carbon fiber, 0.5-1% of nano silicon dioxide, 1-5% of silica sand, 0.2-0.5% of coal gangue and 0.6% of water-material ratio, wherein the concrete blocks are connected through inserted steel bars.
Preferably, the fineness of the quick lime is 0.080 mm.
Preferably, the content of the effective calcium oxide in the quicklime is 78-80%, and the content of the magnesium oxide in the quicklime is 4-5%.
Preferably, the fineness of the nano-silica is 1-5 μm.
Preferably, the fineness of the silica sand is 1.18mm, the content of silicon dioxide in the silica sand is more than 90%, and the content of mud in the silica sand is less than 5%.
Preferably, the fly ash is ground by a mechanical grinding method and then added with sodium hydroxide to be stirred and activated, and the fineness of the fly ash is 45 μm.
A production method of an autoclaved aerated concrete block comprises the following steps:
s1: the fly ash is mixed with water and the waste slurry and wet-milled.
S2: adding the ground quicklime, then adding the cement and the gypsum, uniformly mixing, and introducing steam into a slurry metering tank to heat the mixed slurry to 45 ℃.
S3: adding the aluminum powder suspension which is stirred by adding water, the tea saponin, the carbon fiber, the nano silicon dioxide, the silica sand and the coal gangue to stir and mix about one to half minutes before the materials are poured.
S4: transferring the prepared raw materials to a pouring truck, pouring the raw materials into a mold prepared in advance, standing for a period of time, and then cutting the demolding frame.
S5: and transferring the cut concrete block blank into a steam curing chamber for steam curing, and removing the mold and placing a finished product after the steam curing is finished.
Preferably, the standing time is 2-3h, and the room temperature of standing is 50-70 ℃.
Preferably, the steam-curing time is 8-10 h.
Preferably, the waste slurry is prepared by adding water into blank leftover materials generated in the process of cutting the concrete block blanks of the previous batch and stirring, and long holes which are transversely distributed are reserved on two sides of the poured concrete block blanks.
(III) advantageous effects
The invention provides an autoclaved aerated concrete block and a production method thereof, and the autoclaved aerated concrete block has the following beneficial effects:
the invention adds fly ash, quicklime and cement as main raw materials, adds gypsum, aluminum powder, tea saponin, carbon fiber, nano-silica, silica sand and coal gangue as additives, in order to make the product have better strength, improves the granularity and active substance content of the fly ash, uses the tea saponin as a foam stabilizer, has good functions of emulsification, dispersion, foaming, moistening and the like, uses the aluminum powder as a gas former, uses the quicklime to provide good gas-forming conditions for the aluminum powder, uses the gypsum to adjust the hydration heat release speed of the quicklime, discharges gas, and makes the gas undergo the processes of adsorption, aggregation, growth and the like in the slurry, finally makes the slurry thicken along with the completion of the formation and crystallization of hydration products of silicon, calcium and aluminum in the standing and steam curing stage, generates a certain strength to fix bubbles, forms stable, uniform and fine pores, and finally forms a light porous structure, guarantee that inner structure is stable, the quiet stop is crucial to good pore structure formation process, and the carbon fiber and the nano-silica that add simultaneously also can further improve intensity, links up through the grafting reinforcing bar between the concrete block, has also guaranteed the structural strength of integral connection.
Drawings
FIG. 1 is a schematic structural view of an autoclaved aerated concrete block of the invention;
FIG. 2 is a cross-sectional view of an autoclaved aerated concrete block in a long hole position;
FIG. 3 is a schematic structural view of the connection between the autoclaved aerated concrete blocks through steel bars.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, the present invention provides a technical solution: the autoclaved aerated concrete block comprises the following raw materials in percentage by mass: 66% of fly ash, 18% of quicklime, 12% of cement, 1.95% of gypsum, 0.15% of aluminum powder, 0.1% of tea saponin, 0.1% of carbon fiber, 0.5% of nano-silica, 1% of silica sand, 0.2% of coal gangue and 0.6% of water-material ratio, and concrete blocks are connected through splicing steel bars.
As a technical optimization scheme of the invention, the fineness of the quicklime is 0.080mm, the quicklime is an indispensable component of the autoclaved aerated concrete block, and the quicklime is digested with water to release a large amount of heat in the mixing, stirring and forming process, so that a blank is maintained in the standing and hardening process.
As a technical optimization scheme of the invention, the content of the effective calcium oxide in the quicklime is 78-80%, and the content of the magnesium oxide in the quicklime is 4-5%.
As a technical optimization scheme of the invention, the fineness of the nano silicon dioxide is 1-5 mu m.
As a technical optimization scheme of the invention, the fineness of the silica sand is 1.18mm, the content of silicon dioxide in the silica sand is more than 90%, and the content of mud in the silica sand is less than 5%.
As a technical optimization scheme of the invention, the fly ash is ground by a mechanical grinding method and then added with sodium hydroxide to be stirred and activated, the fineness of the fly ash is 45 mu m, the fly ash is a main component of an autoclaved aerated concrete block, the fly ash is a main provider of silicon dioxide and aluminum oxide in the concrete block, the fly ash has double functions of aggregate and generation of a cementing material, and the higher the content of a vitreous body in the fly ash is, the finer the granularity is, and the higher the chemical reaction activity of the material is.
A production method of an autoclaved aerated concrete block comprises the following steps:
s1: the fly ash is mixed with water and the waste slurry and wet-milled.
S2: adding the ground quicklime, then adding the cement and the gypsum and uniformly mixing, introducing steam into a slurry metering tank to heat the mixed slurry to 45 ℃, and regulating the cement setting time, the quicklime digestion speed and the slurry stability by the gypsum, thereby improving the strength of later-stage green body and aerated concrete block products, reducing the shrinkage and improving the strength.
S3: adding the aluminum powder suspension liquid stirred by adding water, tea saponin, carbon fiber, nano silicon dioxide, silica sand and coal gangue to stir and mix about one to half minutes before the pouring of the materials, adding aluminum powder to react in a water environment to release hydrogen, and forming uniform and fine bubbles in generated gas in slurry with a certain thickening degree through the processes of adsorption, aggregation, growth and the like to finally form a light porous structure.
S4: transferring the prepared raw materials to a pouring truck, pouring the raw materials into a mold prepared in advance, standing for a period of time, and then cutting the demolding frame.
S5: and transferring the cut concrete block blank into a steam curing chamber for steam curing, and removing the mold and placing a finished product after the steam curing is finished.
As a technical optimization scheme of the invention, the standing time is 2-3h, and the room temperature of standing is 50-70 ℃.
As a technical optimization scheme of the invention, the steam curing time is 8-10 h.
As a technical optimization scheme of the invention, the waste slurry is prepared by adding water into blank leftover materials generated in the process of cutting the concrete building block blanks of the previous batch and stirring the blank leftover materials, so that the purposes of saving resources, changing waste into valuable, saving energy and reducing emission are achieved, the two sides of the poured concrete building block blanks are reserved with transversely distributed long holes, laterally adjacent concrete building blocks are connected through inserting reinforcing steel bars into the long holes, and the structural strength of integral connection is ensured.
The compressive strength of the obtained single autoclaved aerated concrete block is about 5Mpa, and the porosity is about 73.83%.
In conclusion, the fly ash, the quicklime and the cement are added as main raw materials, and the gypsum, the aluminum powder, the tea saponin, the carbon fiber, the nano-silica, the silica sand and the coal gangue are added as additives, so that the problem of improving the strength of the autoclaved aerated concrete block is solved.
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An autoclaved aerated concrete block is characterized in that: the formula comprises the following raw materials in percentage by mass: 65-70% of fly ash, 18-20% of quicklime, 10-15% of cement, 1.6-2.2% of gypsum, 0.15-0.18% of aluminum powder, 0.1-0.15% of tea saponin, 0.1-0.2% of carbon fiber, 0.5-1% of nano silicon dioxide, 1-5% of silica sand, 0.2-0.5% of coal gangue and 0.6% of water-material ratio, wherein the concrete blocks are connected through inserted steel bars.
2. The autoclaved aerated concrete block according to claim 1, characterized in that: the fineness of the quick lime is 0.080 mm.
3. The autoclaved aerated concrete block according to claim 1, characterized in that: the content of effective calcium oxide in the quicklime is 78-80%, and the content of magnesium oxide in the quicklime is 4-5%.
4. The autoclaved aerated concrete block according to claim 1, characterized in that: the fineness of the nano silicon dioxide is 1-5 mu m.
5. The autoclaved aerated concrete block according to claim 1, characterized in that: the fineness of the silica sand is 1.18mm, the content of silicon dioxide in the silica sand is more than 90%, and the content of mud in the silica sand is less than 5%.
6. The autoclaved aerated concrete block according to claim 1, characterized in that: the fly ash is ground by a mechanical grinding method and then added with sodium hydroxide to be stirred and activated, and the fineness of the fly ash is 45 mu m.
7. The production method of the autoclaved aerated concrete block according to claim 1, characterized in that: the method comprises the following steps:
s1: adding water into the fly ash and mixing the fly ash with the waste slurry, and carrying out wet grinding;
s2: adding the ground quicklime, then adding cement and gypsum, uniformly mixing, and introducing steam into a slurry metering tank to heat the mixed slurry to 45 ℃;
s3: adding the aluminum powder suspension which is stirred by adding water, the tea saponin, the carbon fiber, the nano silicon dioxide, the silica sand and the coal gangue to stir and mix about one to half minutes before the materials are poured;
s4: transferring the prepared raw materials to a pouring truck, pouring the raw materials into a mold prepared in advance, standing for a period of time, and then cutting a demolding frame;
s5: and transferring the cut concrete block blank into a steam curing chamber for steam curing, and removing the mold and placing a finished product after the steam curing is finished.
8. The production method of the autoclaved aerated concrete block according to claim 7, characterized in that: the standing time is 2-3h, and the room temperature of standing is 50-70 ℃.
9. The production method of the autoclaved aerated concrete block according to claim 7, characterized in that: the steam curing time is 8-10 h.
10. The production method of the autoclaved aerated concrete block according to claim 7, characterized in that: the waste slurry is prepared by adding water into blank leftover materials generated in the process of cutting the concrete building block blank of the previous batch and stirring, and long holes which are transversely distributed are reserved on two sides of the poured concrete building block blank.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666769A (en) * | 2021-09-08 | 2021-11-19 | 内蒙古汇方新型建材有限公司 | High-alumina fly ash light autoclaved aerated concrete plate and preparation method thereof |
| CN114455975A (en) * | 2022-02-28 | 2022-05-10 | 沈阳中泽环境工程有限公司 | Method for preparing autoclaved aerated concrete product by utilizing molybdenum tailing slurry |
| CN115140992A (en) * | 2022-05-27 | 2022-10-04 | 安徽省高迪循环经济产业园股份有限公司 | Concrete raw material, autoclaved aerated concrete plate and preparation method thereof |
| CN115784697A (en) * | 2022-11-29 | 2023-03-14 | 广州市贤达建材有限公司 | Self-heat-insulation autoclaved aerated building block and preparation process thereof |
| CN116283352A (en) * | 2023-04-07 | 2023-06-23 | 攀枝花市润泽建材有限公司 | Method for preparing aerated concrete by carbon dioxide gas generation and concrete product |
| CN116813371A (en) * | 2022-08-09 | 2023-09-29 | 嘉华特种水泥股份有限公司 | Aerated concrete plate maintained by using cement kiln tail flue gas and preparation method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666769A (en) * | 2021-09-08 | 2021-11-19 | 内蒙古汇方新型建材有限公司 | High-alumina fly ash light autoclaved aerated concrete plate and preparation method thereof |
| CN113666769B (en) * | 2021-09-08 | 2022-06-07 | 内蒙古汇方新型建材有限公司 | High-alumina fly ash light autoclaved aerated concrete plate and preparation method thereof |
| CN114455975A (en) * | 2022-02-28 | 2022-05-10 | 沈阳中泽环境工程有限公司 | Method for preparing autoclaved aerated concrete product by utilizing molybdenum tailing slurry |
| CN115140992A (en) * | 2022-05-27 | 2022-10-04 | 安徽省高迪循环经济产业园股份有限公司 | Concrete raw material, autoclaved aerated concrete plate and preparation method thereof |
| CN116813371A (en) * | 2022-08-09 | 2023-09-29 | 嘉华特种水泥股份有限公司 | Aerated concrete plate maintained by using cement kiln tail flue gas and preparation method |
| CN115784697A (en) * | 2022-11-29 | 2023-03-14 | 广州市贤达建材有限公司 | Self-heat-insulation autoclaved aerated building block and preparation process thereof |
| CN115784697B (en) * | 2022-11-29 | 2024-02-23 | 广州市贤达建材有限公司 | Self-heat-preservation autoclaved aerated block and preparation process thereof |
| CN116283352A (en) * | 2023-04-07 | 2023-06-23 | 攀枝花市润泽建材有限公司 | Method for preparing aerated concrete by carbon dioxide gas generation and concrete product |
| CN116283352B (en) * | 2023-04-07 | 2024-02-09 | 攀枝花市润泽建材有限公司 | Method for preparing aerated concrete by carbon dioxide gas generation and concrete product |
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Application publication date: 20210319 |