CN116063096A - High-carbon-fixation autoclaved aerated concrete and preparation method thereof - Google Patents
High-carbon-fixation autoclaved aerated concrete and preparation method thereof Download PDFInfo
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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
- C04B28/04—Portland cements
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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
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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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
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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
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
The invention provides high-carbon-fixation autoclaved aerated concrete and a preparation method thereof, which belong to the technical field of building materials, and the high-carbon-fixation autoclaved aerated concrete comprises the following components in parts by mass: 15-50 parts of cement, 20-55 parts of steel slag, 10-30 parts of slag, 5-15 parts of lime, 0-5 parts of gypsum, 20-60 parts of water, 0.1-0.4 part of foaming agent, 0-0.5 part of water reducer, 1-4 parts of excitant and 0.02-0.5 part of foam stabilizer. The invention takes a large amount of solid waste steel slag and slag as main raw materials, is favorable for recycling industrial waste slag, reduces the cement dosage in the autoclaved aerated concrete, effectively reduces the production cost of the autoclaved aerated concrete, adopts a pressure-variable curing process, is favorable for deep mineralization reaction, and can directly absorb a large amount of CO 2 The carbon fixation amount is more than 15 percent of the mass of the carbon-free material, is an effective way for utilizing carbon,greatly shortens the production period of the autoclaved aerated concrete, and can produce aerated concrete products with qualified strength in a short period.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to high-carbon-fixation autoclaved aerated concrete and a preparation method thereof.
Background
The aerated concrete is light porous concrete, and has excellent performances of heat preservation, shock resistance, sound absorption, fire resistance, easiness in processing and the like based on the light weight (the expression density is generally 300-800kg/m < 3 >) and the porosity of the aerated concrete. Under the background that the state advocates green building and energy-saving building materials, the material is widely applied to the engineering field as a novel building material. The traditional aerated concrete preparation raw materials comprise cementing materials, admixture or aggregate and special additives, chemical gas generating agents are added into the mixed slurry to generate bubbles, the volume of the slurry expands, the bubbles are reserved in the hardened slurry along with the hydration reaction of the slurry, and the blank body forms a porous structure. According to the curing mode, the method can be classified into autoclaved curing and non-autoclaved curing. The curing mode with the widest application range at present is autoclaved curing, and the autoclaved curing is generally carried out in a cement autoclave at 180-200 ℃ for 8-15 h. The aerated concrete block prepared by the curing mode has high strength development speed. The curing temperature of the non-autoclaved curing is lower than 100 ℃, the curing time is generally longer, and compared with the autoclaved curing with high energy consumption, the non-autoclaved curing is safe, the cost is low, and the application prospect is good.
The invention patent (CN 111807807A) discloses a autoclaved lightweight heat-insulating particle aerated concrete block and a preparation method thereof. The lightweight particle aerated concrete is prepared by mutually compounding cement, fly ash, slag micropowder, lightweight particles, foaming agent, coagulant, foam stabilizer, water reducer, water repellent, fiber and water. After the slurry foaming is finished, covering a thin plastic film on the surface of the sample to prevent water evaporation, curing for 24 hours at 18-22 ℃ for removing the mold, and placing the mold into a standard curing box for curing for 26-30 days. The aerated concrete block has the advantages of light dead weight, good heat preservation and insulation performance, strong durability, good waterproof performance, simple process and simple preparation.
Common defects in the existing autoclaved aerated concrete preparation method include: 1. the long curing period limits its wide application. Unlike autoclaved aerated concrete, which rapidly forms large amounts of hydrated calcium silicate gel and minerals of higher crystallinity such as tobermorite, hydrogarnet, etc., autoclaved aerated concrete often requires longer curing times (3-28 days) to form enough hydration products to provide strength. In practical production, the cost problem caused by overlong production cycle limits the wide application. 2. The cement is high in usage, industrial solid waste cannot be used as raw materials in a large amount, and the production cost is high. 3. The carbon emission in the production process is large, and the high carbon fixation function is not achieved. The CO2 emission amount brought by the firing process of the cement which is the main raw material of the concrete is large.
Disclosure of Invention
The invention aims to provide high-carbon-fixation autoclaved aerated concrete and a preparation method thereof, which solve the technical problems in the background technology. The high-carbon-fixation autoclaved aerated concrete can absorb a large amount of carbon dioxide in the production and use processes, and a large amount of solid wastes such as steel slag and the like are absorbed; meanwhile, the lightweight high-strength autoclaved aerated concrete is prepared through the synergistic effect of front end hydration, carbonization maintenance and subsequent hydration, so that the production period is shortened, and the production cost is reduced. The high-carbon-fixation autoclaved aerated concrete has the advantages of efficiently absorbing CO2 in the tail smoke of the cement kiln, absorbing solid waste, along with short production period, low cost, light weight and high strength.
The mineralization of the steel slag can improve the early strength of the steel slag, solve the problem of volume expansion of building materials prepared by hydration of the steel slag, greatly improve the utilization rate of the steel slag, shorten the maintenance period, and simultaneously absorb carbon dioxide in industrial waste gas to relieve the greenhouse effect to a certain extent, thereby having certain economic benefit, environmental benefit and social benefit. The oxides of calcium, magnesium, ferrous iron and the like in the solid waste such as steel slag and the like can participate in carbonization reaction, wherein the content of the calcium oxide accounts for 35-55 percent. The substances containing calcium, magnesium and ferrous iron react with carbon dioxide to generate microcrystalline calcite (calcium carbonate), dolomite, iron dolomite, siderite and the like with compact structures on the one hand, and on the other hand, the substances can react with water to generate hydration products such as C-S-H gel, ettringite and the like easily. Both effects promote the increase in strength of the product produced.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the high-carbon-fixation autoclaved aerated concrete comprises the following components in parts by weight: 15-50 parts of cement, 20-55 parts of steel slag, 10-30 parts of slag, 5-15 parts of lime, 0-5 parts of gypsum, 20-60 parts of water, 0.1-0.4 part of foaming agent, 0-0.5 part of water reducer, 1-4 parts of excitant and 0.02-0.5 part of foam stabilizer.
Further, the cement is Portland cement with the strength not lower than 42.5 grades, the steel slag is steel slag powder with the specific surface area not lower than 350m2/kg, and the slag is slag powder with the specific surface area not lower than 350m 2/kg.
Further, lime is quicklime, gypsum is desulfurized gypsum, and the water reducing agent is one or more of a polycarboxylic acid high-efficiency water reducing agent, a naphthalene high-efficiency water reducing agent and a sulfamate water reducing agent.
Further, the foaming agent is aluminum powder paste, and the exciting agent is water glass with the modulus of 1-2.
Further, the foam stabilizer is one or more of soluble oil, cellulose ether and polyvinyl alcohol.
A preparation method of high-carbon-fixation autoclaved aerated concrete, which comprises the following steps:
step 1: coating the mold with mold release oil;
step 2: weighing and metering cement, steel slag, lime, gypsum, and other powder materials in proportion, uniformly mixing, and then adding a water reducer, an exciting agent and water to stir for 5min at a low speed;
step 3: adding the rest water and foam stabilizer into the weighed foaming agent, and pouring the foaming agent suspension into a stirring pot for rapid stirring for 30-60s;
step 4: pouring the slurry into a mould, standing for 4-8 hours in a steam curing box at 40-60 ℃, cutting off a surface packet head, and removing the mould;
step 5: and (3) pressure-variable mineralization maintenance: delivering the cut green body into a carbonization curing kettle filled with CO2 with the volume concentration of 25-99%, wherein the pressure is 0.001-0.05 MPa, the pressure is 2-4h, and the pressure is 0.1-0.3 MPa;
step 6: post curing: and (3) after the carbonization curing of the green body is finished, the green body is moved into a standard curing chamber, and is cured for 1-3 days under the conditions that the temperature is 20 ℃ and the relative humidity is more than 90%.
The hydration products after the block is pre-cured are mainly C-S-H gel and ettringite, the contents of ettringite and C-S-H gel in the hydration products after the additive is excited are obviously increased, and the hydration products are more formed along with the pre-curing temperature, so that the method is the key of the early strength of the block. The CO2 mineralization maintenance needs a certain plasticity of the foam concrete hole wall, so that the early strength is not excessively high. The steel slag and the slag have hydraulic property and gelation property, and can strengthen the strength of the building block. Calcium hydroxide is formed in the slaking process to release heat, which is favorable for the gas generation of aluminum powder, and certain calcium materials are supplemented, so that the subsequent carbonization reaction is facilitated. The excitant can destroy the vitreous structure in the steel slag and improve the hydration activity of the steel slag. The foam stabilizer can maintain the stability of bubbles in the slurry, so that the pore wall is tough and the shape is more uniform.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the invention takes a large amount of solid waste steel slag and slag as main raw materials, is favorable for recycling industrial waste slag, reduces the cement dosage in the autoclaved aerated concrete, effectively reduces the production cost of the autoclaved aerated concrete, adopts a pressure-variable curing process, is favorable for deep mineralization reaction, and can directly absorb a large amount of CO 2 The carbon fixation amount is more than 15% of the mass of the aerated concrete, so that the aerated concrete is an effective way for utilizing carbon, the production period of the autoclaved aerated concrete is greatly shortened, and the aerated concrete product with qualified strength can be produced in a short period.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail by referring to preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.
Comparative example 1: the preparation method of the autoclaved carbon-fixing aerated concrete based on the hydration-mineralization synergistic effect comprises the following components in parts by weight: 15 parts of cement, 55 parts of steel slag, 15 parts of slag, 10 parts of quicklime, 5 parts of gypsum, 20 parts of water, 0.4 part of aluminum powder paste, 0.5 part of polycarboxylic acid high-efficiency water reducer, 1 part of sodium silicate with a modulus of 1 and 0.1 part of polyvinyl alcohol foam stabilizer.
1) The preparation method comprises the following steps:
2) Coating the mold with mold release oil;
3) Weighing and metering cement, steel slag, lime, gypsum, and other powder materials in proportion, uniformly mixing, and then adding a water reducer, an exciting agent and water to stir for 5min at a low speed;
4) Adding the rest water and foam stabilizer into the weighed foaming agent, and pouring the foaming agent suspension into a stirring pot for rapid stirring for 60s;
5) Pouring the slurry into a mould, standing for 4 hours in a steam curing box at 55 ℃, cutting off a surface packet head, and removing the mould;
6) Curing at normal temperature: the green body is moved into a natural curing chamber, and cured for 3 days under the conditions of the temperature of 20 ℃ and the relative humidity of more than 90 percent.
The volume weight of the block is 599kg/m3, the compressive strength is 2.9MPa, and the carbon fixation amount is 2.57%.
Comparative example 2: the preparation method of the autoclaved carbon-fixing aerated concrete based on the hydration-mineralization synergistic effect comprises the following components in parts by weight: 40 parts of cement, 20 parts of steel slag, 30 parts of slag, 7.5 parts of quicklime, 2.5 parts of gypsum, 40 parts of water, 0.15 part of aluminum powder paste, 0.25 part of water reducer, 2 parts of sodium silicate with a modulus of 1.5 and 0.02 part of soluble oil foam stabilizer.
1) The preparation method comprises the following steps:
2) Coating the mold with mold release oil;
3) Weighing and metering cement, steel slag, lime, gypsum, and other powder materials in proportion, uniformly mixing, and then adding a water reducer, an exciting agent and water to stir for 5min at a low speed;
4) Adding the rest water and foam stabilizer into the weighed foaming agent, and pouring the foaming agent suspension into a stirring pot for rapid stirring for 60s;
5) Pouring the slurry into a mould, standing for 4 hours in a steam curing box at 55 ℃, cutting off a surface packet head, and removing the mould;
6) And (3) pressure-variable carbonization maintenance: and (3) conveying the cut green body to a carbonization curing kettle with the CO2 volume concentration of 25%, wherein the pressure is 0.02MPa in the 0 th to 2 nd hours and 0.2MPa in the 2 nd to 4 th hours.
The volume weight of the block is 730kg/m3, the compressive strength is 4.1MPa, and the carbon fixation amount is 15.9%.
Comparative example 3: the preparation method of the autoclaved carbon-fixing aerated concrete based on the hydration-mineralization synergistic effect comprises the following components in parts by weight: 50 parts of cement, 30 parts of steel slag, 5 parts of slag, 15 parts of quicklime, 60 parts of water, 0.1 part of water reducing agent, 0.4 part of aluminum powder paste, 1.4 parts of sodium silicate with the modulus of 2 and 0.5 part of cellulose ether foam stabilizer.
7) The preparation method comprises the following steps:
8) Coating the mold with mold release oil;
9) Weighing and metering cement, steel slag, lime, gypsum, and other powder materials in proportion, uniformly mixing, and then adding a water reducer, an exciting agent and water to stir for 5min at a low speed;
10 Adding the rest water and the foam stabilizer into the weighed foaming agent, and pouring the foaming agent suspension into a stirring pot for rapid stirring for 30s;
11 Pouring the slurry into a mould, standing in a steam curing box at 55 ℃ for 8 hours, cutting off a surface packet head, and removing the mould;
12 Normal carbonization maintenance: and (3) conveying the cut green body to a carbonization curing kettle with 99% CO2 volume concentration, and carbonizing for 2 hours under the pressure of 0.2MPa.
13 Post curing: the green body is moved into a natural curing chamber, and cured for 3 days under the conditions of the temperature of 20 ℃ and the relative humidity of more than 90 percent.
The volume weight of the block is 690kg/m3, the compressive strength is 3.2MPa, and the carbon fixation amount is 10.2%.
Example 1: the preparation method of the autoclaved carbon-fixing aerated concrete based on the hydration-mineralization synergistic effect comprises the following components in parts by weight: 15 parts of cement, 55 parts of steel slag, 15 parts of slag, 10 parts of quicklime, 5 parts of gypsum, 20 parts of water, 0.4 part of aluminum powder paste, 0.5 part of water reducer, 1 part of sodium silicate with a modulus of 1 and 0.1 part of polyvinyl alcohol foam stabilizer.
1) The preparation method comprises the following steps:
2) Coating the mold with mold release oil;
3) Weighing and metering cement, steel slag, lime, gypsum, and other powder materials in proportion, uniformly mixing, and then adding a water reducer, an exciting agent and water to stir for 5min at a low speed;
4) Adding the rest water and foam stabilizer into the weighed foaming agent, and pouring the foaming agent suspension into a stirring pot for rapid stirring for 60s;
5) Pouring the slurry into a mould, standing for 4 hours in a steam curing box at 55 ℃, cutting off a surface packet head, and removing the mould;
6) And (3) pressure-variable carbonization maintenance: and (3) conveying the cut green body to a carbonization curing kettle with 25% CO2 volume concentration for 0-2h at 0.01MPa for 2-4h at 0.1MPa.
7) Post curing: and (3) after the carbonization curing of the green body is finished, the green body is moved into a natural curing chamber, and is cured for 3 days under the conditions that the temperature is 20 ℃ and the relative humidity is more than 90%.
The volume weight of the block is 648kg/m3, the compressive strength is 3.9MPa, and the carbon fixation amount is 15.1%.
Example 2: the preparation method of the autoclaved carbon-fixing aerated concrete based on the hydration-mineralization synergistic effect comprises the following components in parts by weight: 40 parts of cement, 20 parts of steel slag, 30 parts of slag, 7.5 parts of quicklime, 2.5 parts of gypsum, 40 parts of water, 0.15 part of aluminum powder paste, 0.25 part of water reducer, 2 parts of sodium silicate with a modulus of 1.5 and 0.02 part of soluble oil foam stabilizer.
The preparation method comprises the following steps:
1) Coating the mold with mold release oil;
2) Weighing and metering cement, steel slag, lime, gypsum, and other powder materials in proportion, uniformly mixing, and then adding a water reducer, an exciting agent and water to stir for 5min at a low speed;
3) Adding the rest water and foam stabilizer into the weighed foaming agent, and pouring the foaming agent suspension into a stirring pot for rapid stirring for 30s;
4) Pouring the slurry into a mould, standing for 4 hours in a steam curing box at 40 ℃, cutting off a surface packet head, and removing the mould;
5) And (3) pressure-variable carbonization maintenance: and (3) conveying the cut green body to a carbonization curing kettle with CO2 volume concentration of 75%, wherein the pressure is 0-2h, the pressure is 0.05MPa, the pressure is 2-4h and the pressure is 0.3MPa.
8) Post curing: and (3) after the carbonization curing of the green body is finished, the green body is moved into a natural curing chamber, and is cured for 1 day under the conditions that the temperature is 20 ℃ and the relative humidity is more than 90%.
The volume weight of the block is 735kg/m3, the compressive strength is 5.0MPa, and the carbon fixation amount is 16.2%.
Example 3: the preparation method of the autoclaved carbon-fixing aerated concrete based on the hydration-mineralization synergistic effect comprises the following components in parts by weight: 50 parts of cement, 30 parts of steel slag, 5 parts of slag, 15 parts of quicklime, 60 parts of water, 0.1 part of water reducing agent, 0.4 part of aluminum powder paste, 1.4 parts of sodium silicate with the modulus of 2 and 0.5 part of cellulose ether foam stabilizer.
The preparation method comprises the following steps:
1) Coating the mold with mold release oil;
2) Weighing and metering cement, steel slag, lime, gypsum, and other powder materials in proportion, uniformly mixing, and then adding a water reducer, an exciting agent and water to stir for 5min at a low speed;
3) Adding the rest water and foam stabilizer into the weighed foaming agent, and pouring the foaming agent suspension into a stirring pot for rapid stirring for 30s;
4) Pouring the slurry into a mould, standing for 8 hours in a steam curing box at 55 ℃, cutting off a surface packet head, and removing the mould;
5) And (3) pressure-variable carbonization maintenance: and (3) conveying the cut green body to a carbonization curing kettle with 99% CO2 volume concentration for 0-2h at 0.02MPa for 2-4h at 0.2MPa.
6) Post curing: and (3) after the carbonization curing of the green body is finished, the green body is moved into a natural curing chamber, and is cured for 3 days under the conditions that the temperature is 20 ℃ and the relative humidity is more than 90%.
The volume weight of the block is 650kg/m3, the compressive strength is 4.0MPa, and the carbon fixation amount is 15.6%.
As is clear from comparative example 1 and example 1, the curing process is free of CO 2 The intervention, only hydration provides intensity, the intensity of aerated concrete is lower than 3.5MPa, and no carbon fixation effect is achieved.Mineralized curing is necessary to increase strength and carbon fixation.
From comparative example 2 and example 2, it is known that the synergistic effect of mineralization curing and post curing is beneficial to the improvement of the strength of aerated concrete.
From comparative example 3 and example 3, the pressure-variable mineralization curing is beneficial to improving the strength and the carbon fixation of the aerated concrete.
In conclusion, the preparation method of the autoclaved carbon-fixing aerated concrete based on the hydration-mineralization synergistic effect can be used for producing high-carbon-fixing autoclaved aerated concrete, and has the advantages of efficiently absorbing CO2 in the flue gas of the kiln tail of cement, absorbing solid wastes, along with short production period, low cost, light weight and high strength.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A high-carbon-fixation autoclaved aerated concrete is characterized in that: comprises the following components in parts by mass: 15-50 parts of cement, 20-55 parts of steel slag, 10-30 parts of slag, 5-15 parts of lime, 0-5 parts of gypsum, 20-60 parts of water, 0.1-0.4 part of foaming agent, 0-0.5 part of water reducer, 1-4 parts of excitant and 0.02-0.5 part of foam stabilizer.
2. The high carbon sequestration autoclaved aerated concrete of claim 1, wherein: the cement is Portland cement with the strength not lower than 42.5 grades, the steel slag is steel slag powder with the specific surface area not lower than 350m2/kg, and the slag is slag powder with the specific surface area not lower than 350m 2/kg.
3. The high carbon sequestration autoclaved aerated concrete of claim 1, wherein: lime is quicklime, gypsum is desulfurized gypsum, and the water reducing agent is one or more of a polycarboxylic acid high-efficiency water reducing agent, a naphthalene high-efficiency water reducing agent and a sulfamate water reducing agent.
4. The high carbon sequestration autoclaved aerated concrete of claim 1, wherein: the foaming agent is aluminum powder paste, and the exciting agent is water glass with the modulus of 1-2.
5. The high carbon sequestration autoclaved aerated concrete of claim 1, wherein: the foam stabilizer is one or more of soluble oil, cellulose ether and polyvinyl alcohol.
6. The method for preparing the high-carbon non-autoclaved aerated concrete according to any one of claims 1 to 5, which is characterized in that: the method comprises the following steps:
step 1: coating the mold with mold release oil;
step 2: weighing and metering cement, steel slag, lime, gypsum, and other powder materials in proportion, uniformly mixing, and then adding a water reducer, an exciting agent and water to stir for 5min at a low speed;
step 3: adding the rest water and foam stabilizer into the weighed foaming agent, and pouring the foaming agent suspension into a stirring pot for rapid stirring for 30-60s;
step 4: pouring the slurry into a mould, standing for 4-8 hours in a steam curing box at 40-60 ℃, cutting off a surface packet head, and removing the mould;
step 5: and (3) pressure-variable mineralization maintenance: delivering the cut green body into a carbonization curing kettle filled with CO2 with the volume concentration of 25-99%, wherein the pressure is 0.001-0.05 MPa, the pressure is 2-4h, and the pressure is 0.1-0.3 MPa;
step 6: post curing: and (3) after the carbonization curing of the green body is finished, the green body is moved into a standard curing chamber, and is cured for 1-3 days under the conditions that the temperature is 20 ℃ and the relative humidity is more than 90%.
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| CN110734300A (en) * | 2019-10-09 | 2020-01-31 | 湖南工程学院 | aerated concrete blocks and preparation process thereof |
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| CN114890809A (en) * | 2022-06-17 | 2022-08-12 | 华润水泥技术研发有限公司 | Steel slag-based high-carbon-fixation-quantity non-autoclaved aerated concrete and preparation method thereof |
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