CN116751071A - High-performance low-carbon aerated concrete and preparation method thereof - Google Patents
High-performance low-carbon aerated concrete and preparation method thereof Download PDFInfo
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- CN116751071A CN116751071A CN202310690078.XA CN202310690078A CN116751071A CN 116751071 A CN116751071 A CN 116751071A CN 202310690078 A CN202310690078 A CN 202310690078A CN 116751071 A CN116751071 A CN 116751071A
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- aerated concrete
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title abstract description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 69
- 239000000463 material Substances 0.000 claims description 60
- 229910001570 bauxite Inorganic materials 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 229910001868 water Inorganic materials 0.000 claims description 20
- 239000011268 mixed slurry Substances 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 10
- 238000010025 steaming Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000006116 polymerization reaction Methods 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 241000219146 Gossypium Species 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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 a high-performance low-carbon aerated concrete and a preparation method thereof, and relates to the technical field of aerated concrete.
Description
Technical Field
The invention relates to the technical field of aerated concrete, in particular to high-performance low-carbon aerated concrete and a preparation method thereof.
Background
The ultra-low energy consumption building in China is different from European and American single-span building in most of high-rise buildings, and along with implementation of stricter energy saving policies, the safety and durability of heavy heat preservation in the existing ultra-low energy consumption wall body in building application become technical difficulties to be solved by the ultra-low energy consumption wall body.
In order to meet the requirements of continuous development and energy conservation, low-energy-consumption aerated concrete product building walls are developed, and according to building standards and requirements, the existing common autoclaved aerated concrete has high heat conductivity coefficient and cannot meet the 80% requirement of self-heat-insulation and energy-saving effects of a single wall on the basis that the bearing strength of the building outer wall is not lower than 3.5Mpa and the thickness of the outer wall is 300mm, and the aerated concrete is externally applied or sandwiched to replace other heat-insulation materials, such as polystyrene boards, rock cottons and the like. The polystyrene board can not meet the fireproof requirement, and a plurality of fire hazards exist. Rock wool has the problem of cracking of a thick heat-insulating wall body despite improvement in fireproof aspect, and particularly has the potential safety hazard caused by heat insulation falling off of an outer wall of a high-rise building. Whether the building outer wall is externally coated with aerated concrete or is composited with other heat-preserving products by sandwiches, the quality problems of ageing and pulverization exist, the requirement of the same service life as the building cannot be met, and other defects such as condensation, cold and hot bridges and the like also exist.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide high-performance low-carbon aerated concrete and a preparation method thereof, which can solve the problems of poor strength and high heat conductivity of common autoclaved aerated concrete.
In order to achieve the above purpose, the invention provides high-performance low-carbon aerated concrete, which comprises dry materials and wet materials, wherein the dry materials comprise cement and lime, the wet materials comprise mortar, waste slurry and a gas generating agent, the high-performance low-carbon aerated concrete further comprises novel additional materials, the novel additional materials are prepared by carrying out wet-heat polymerization reaction on sodium hydroxide, bauxite and water at 160 ℃ for 0.5-2 hours, the mass ratio of the bauxite to the sodium hydroxide is 1:1-4, and the mass ratio of the sum of the bauxite and the sodium hydroxide to the water is 1:1 to 2.
Preferably, the gas generating agent is aluminum paste.
Preferably, the sodium hydroxide, bauxite and water are subjected to wet-heat polymerization reaction under the sealing condition of a stirring reaction kettle.
The invention also provides a preparation method of the high-performance low-carbon aerated concrete, which comprises the following steps:
(1) Preparing a novel additional material, and forming mixed slurry by sodium hydroxide, bauxite and water, wherein the mass ratio of the bauxite to the sodium hydroxide is 1:1-4, and the mass ratio of the sum of the bauxite and the sodium hydroxide to the water is 1: 1-2, under the sealing condition of a stirring reaction kettle, the temperature of the mixed slurry is raised to 160 ℃ for carrying out wet-heat polymerization reaction, and the mixed slurry reacts at constant temperature for 0.5-2 hours to obtain a novel external material;
(2) And (3) preparing high-performance low-carbon aerated concrete, and mixing dry materials, wet materials and the novel additional materials, wherein the dry materials comprise cement and lime, the wet materials comprise mortar, waste slurry and a gas generating agent, and casting, pre-curing, cutting and steam curing are performed to prepare the finished high-performance low-carbon aerated concrete.
Further, in the step (2), the casting temperature is 40-50 ℃, and the diffusivity of the casting slurry is 300mm; the pre-curing temperature is 45-55 ℃, the pre-curing humidity is not lower than 30%, the pre-curing time is controlled to be 210-240 minutes, and a blank mold is obtained after the pre-curing; the cutting hardness of the blank mold is 350-450 mm, and the cutting temperature of the blank mold is controlled to be about 70 ℃; vacuumizing for 0.5 hour before steaming, heating for 2 hours, steaming at a pressure not lower than 1.2MPa in the steaming process, steaming at a constant temperature of 190 ℃ for not lower than 6 hours, and cooling for 2 hours after steaming.
Compared with the prior art, the high-performance low-carbon aerated concrete and the preparation method thereof have the following beneficial effects:
the novel external material is composed of sodium hydroxide, bauxite and water, and is added into a reaction system of dry materials and wet materials of the aerated concrete, so that the stability of the castable of the aerated concrete is effectively improved, the air hole defect in the air generating process of aluminum paste or aluminum powder is reduced, the purposes of improving the compressive strength of the aerated concrete and reducing the heat conductivity coefficient are achieved, and the high-performance low-carbon aerated concrete with low volume weight, high strength and low heat conductivity coefficient is obtained.
Drawings
FIG. 1 is a process flow diagram of a method for preparing high performance low carbon aerated concrete according to one embodiment of the invention;
fig. 2 is a thermal conductivity analysis data thermal conductivity verification trend graph of autoclaved aerated concrete B04A3.5 in accordance with an embodiment of the present invention.
FIG. 3 is a 5 μm micrograph of a novel add-on material according to an embodiment of the present invention.
FIG. 4 is a 20 μm micrograph of a novel add-on material according to an embodiment of the present invention.
Fig. 5 is a 5 μm microscopic photograph of high performance low carbon aerated concrete according to an embodiment of the present invention.
Fig. 6 is a 20 μm microscopic photograph of high performance low carbon aerated concrete according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
According to the high-performance low-carbon aerated concrete and the preparation method thereof, the novel additional material is added in the manufacturing process of the existing aerated concrete product, the pore microstructure of the autoclaved aerated concrete is improved, the heat conductivity coefficient is reduced, the high-performance low-carbon aerated concrete product with low volume weight, high strength and good heat preservation performance is prepared, and the subversion change is realized on the existing ultralow-energy wall body in the aspects of safety, fire prevention, durability and the like.
The high-performance low-carbon aerated concrete comprises dry materials, wet materials and novel additional materials, wherein the dry materials account for about 20% by weight, the wet materials account for about 79% by weight, the novel additional materials account for about 1% by weight, the dry materials comprise cement and lime, the wet materials comprise mortar, waste slurry and an air generating agent, and the air generating agent is aluminum paste.
The novel external material is mixed slurry composed of sodium hydroxide, bauxite and water, wherein the mass ratio of the bauxite to the sodium hydroxide is 1:1-4; the mass ratio of bauxite to water is 1:3-5; the mass ratio of the sodium hydroxide to the water is 1:2-3; the mass ratio of the sum of the bauxite and the sodium hydroxide to the water is 1:1 to 2; under the sealing condition of a stirring reaction kettle, the temperature of the mixed slurry is raised to 160 ℃ to carry out wet-heat polymerization reaction, and the mixed slurry reacts at constant temperature for 0.5-2 hours to obtain the novel external material. The stirring reaction kettle is a vertical stirring reactor, can also adopt a tubular fluidized bed reactor and other reaction devices, can adopt an electric heating mode, can also adopt other modes such as steam and the like, and ensures the heat for reaction.
The novel external material is added into a system of the aerated concrete, so that the stability of a castable of the aerated concrete is effectively improved, the air hole defect in the air generating process of aluminum paste or aluminum powder is reduced, and the aims of improving the compressive strength of the aerated concrete and reducing the heat conductivity coefficient are fulfilled. And finally realizing the high-performance low-carbon aerated concrete with low volume weight, high strength and low heat conductivity coefficient.
As shown in fig. 1, the preparation method of the high-performance low-carbon aerated concrete comprises the following steps:
(1) Preparing a novel external material, and forming mixed slurry by sodium hydroxide, bauxite and water, wherein the mass ratio of the bauxite to the sodium hydroxide is 1:1-4; the mass ratio of bauxite to water is 1:3-5; the mass ratio of the sodium hydroxide to the water is 1:2-3; the mass ratio of the sum of bauxite and hydrogen oxide to water is 1:1 to 2; under the sealing condition of a stirring reaction kettle, the temperature of the mixed slurry is raised to 160 ℃ to carry out wet-heat polymerization reaction, and the mixed slurry reacts at constant temperature for about 1 hour to obtain a novel external material;
(2) Preparing high-performance low-carbon aerated concrete, and mixing dry materials, wet materials and novel additional materials according to the weight ratio of 20:79:1, mixing, wherein the dry materials comprise cement and lime, the wet materials comprise mortar, waste slurry and an air-entraining agent, wherein the air-entraining agent is aluminum paste, casting, pre-curing, cutting and steam curing are performed, wherein the casting temperature is 40-50 ℃, the diffusion degree of the casting material is 300mm, the pre-curing temperature is 45-55 ℃, the pre-curing humidity is not lower than 30%, the pre-curing time is controlled to be 210-240 minutes, a blank mold is obtained after the pre-curing, the cutting hardness of the blank mold is 350-450 mm, the cutting temperature of the blank mold is controlled to be about 70 ℃, vacuumizing is performed for 0.5 hours before the steam curing, air influencing heat exchange in the steam curing kettle is pumped away, the heat exchange effect between water vapor and a blank body is improved, the steam curing temperature-rising time is 2 hours, the steam curing constant temperature is 190 ℃, the steam curing pressure is not lower than 1.2MPa, the steam curing constant temperature time is not lower than 6 hours, the steam curing is finished, the cooling time is 2 hours, and the finished product high-performance low-carbon aerated concrete is prepared.
The novel external material is prepared from sodium hydroxide, bauxite and water according to a proportion, and is prepared by carrying out a wet-hot land polymerization reaction at 160 ℃ for about 1 hour to obtain a material, and then carrying out full stirring and mixing with dry materials and wet materials, casting, resting, cutting and steam curing to obtain the high-performance low-carbon aerated concrete. As shown in fig. 3, the 5 μm microscopic picture of the novel additional material is shown in fig. 4, and the 20 μm microscopic picture of the novel additional material is characterized in that the novel additional material is in a fiber bundle shape, so that the novel additional material can play a good role in stabilizing and reinforcing the low volume weight aerated concrete of class B04 and below.
As shown in fig. 5, a 5 μm microscopic picture of the high-performance low-carbon aerated concrete, as shown in fig. 6, a 20 μm microscopic picture of the high-performance low-carbon aerated concrete, and the produced high-performance low-carbon aerated concrete system sand aerated concrete is mainly characterized by low volume weight, high strength and low thermal conductivity.
As shown in FIG. 2, the thermal conductivity of autoclaved aerated concrete B04A3.5 was 0.103W/m.k. As shown in Table 1, the volume weight, the strength and the heat conductivity coefficient of the high-performance low-carbon aerated concrete are checked, the quality sampling inspection of different parts is carried out on the GB/T11968-2020 autoclaved aerated concrete block and the GB/T15762-2020 autoclaved aerated concrete slab according to the GB/T11969-2020 autoclaved aerated concrete performance test method, the heat conductivity coefficient reaches 0.103W/m.k, and the performance comprehensively reaches and exceeds the quality standard of the autoclaved aerated concrete B04A3.5.
Table 1 high performance low carbon aerated concrete test data
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (5)
1. The high-performance low-carbon aerated concrete comprises dry materials and wet materials, wherein the dry materials comprise cement and lime, and the wet materials comprise mortar, waste slurry and a gas generating agent, and the high-performance low-carbon aerated concrete is characterized by further comprising novel additional materials, wherein the novel additional materials are prepared by carrying out wet-heat polymerization on sodium hydroxide, bauxite and water at 160 ℃ for 0.5-2 hours, the mass ratio of the bauxite to the sodium hydroxide is 1:1-4, and the mass ratio of the sum of the bauxite and the sodium hydroxide to the water is 1:1 to 2.
2. The high performance low carbon aerated concrete of claim 1 wherein the gas generating agent is an aluminum paste.
3. The high performance low carbon aerated concrete of claim 1 wherein said sodium hydroxide, bauxite and water undergo a wet-heat polymerization reaction under the sealing conditions of a stirred tank reactor.
4. The method for preparing high-performance low-carbon aerated concrete according to claim 1, comprising the following steps:
(1) Preparing a novel additional material, and forming mixed slurry by sodium hydroxide, bauxite and water, wherein the mass ratio of the bauxite to the sodium hydroxide is 1:1-4, and the mass ratio of the sum of the bauxite and the sodium hydroxide to the water is 1: 1-2, under the sealing condition of a stirring reaction kettle, the temperature of the mixed slurry is raised to 160 ℃ for carrying out wet-heat polymerization reaction, and the mixed slurry reacts at constant temperature for 0.5-2 hours to obtain a novel external material;
(2) And (3) preparing high-performance low-carbon aerated concrete, and mixing dry materials, wet materials and the novel additional materials, wherein the dry materials comprise cement and lime, the wet materials comprise mortar, waste slurry and a gas generating agent, and casting, pre-curing, cutting and steam curing are performed to prepare the finished high-performance low-carbon aerated concrete.
5. The method for preparing high-performance low-carbon aerated concrete according to claim 4, wherein the casting temperature in the step (2) is 40-50 ℃; the pre-curing temperature is 45-55 ℃, the casting material expansion is 300mm, the pre-curing humidity is not lower than 30%, the pre-curing time is controlled to be 210-240 minutes, and a blank mold is obtained after the pre-curing; the cutting hardness of the blank mold is 350-450 mm, and the cutting temperature of the blank mold is controlled to be about 70 ℃; vacuumizing for 0.5 hour before steaming, heating for 2 hours, steaming at a pressure not lower than 1.2MPa in the steaming process, steaming at a constant temperature of 190 ℃ for not lower than 6 hours, and cooling for 2 hours after steaming.
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| CN202310690078.XA CN116751071A (en) | 2023-06-12 | 2023-06-12 | High-performance low-carbon aerated concrete and preparation method thereof |
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| CN202310690078.XA CN116751071A (en) | 2023-06-12 | 2023-06-12 | High-performance low-carbon aerated concrete and preparation method thereof |
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| CN116751071A true CN116751071A (en) | 2023-09-15 |
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