CN115180907A - Preparation method of novel foam concrete - Google Patents
Preparation method of novel foam concrete Download PDFInfo
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- CN115180907A CN115180907A CN202210895977.9A CN202210895977A CN115180907A CN 115180907 A CN115180907 A CN 115180907A CN 202210895977 A CN202210895977 A CN 202210895977A CN 115180907 A CN115180907 A CN 115180907A
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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
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- 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
- C04B40/0231—Carbon dioxide hardening
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
The invention discloses a preparation method of novel foam concrete. The method comprises the steps of firstly putting a novel special cementing material, sulphoaluminate cement and water into a stirrer to be stirred for 3-5min, and fully mixing to obtain initial slurry; preparing a foaming agent and water into a solution according to the volume ratio of 1; uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, wherein the volume ratio of the foam to the initial slurry is controlled to be 5-10; pouring the mixed slurry after stirring into a mould, and placing the mould into a concrete carbonization curing box with the normal pressure carbon dioxide concentration of 10-50% for pre-curing for 10-30 min; and (3) demoulding the foam concrete after the pre-curing, and putting the foam concrete in a carbonization kettle with the carbon dioxide partial pressure of 0.1-1.0 MPa at normal temperature for carbonization and curing for 0.5-2 hours to obtain a finished product. The invention utilizes the novel cementing material and the special preparation process, and the prepared foam concrete has the advantages of high strength, capability of curing and sealing carbon dioxide, low dry shrinkage and the like through a carbon dioxide curing mode.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of novel foam concrete.
Background
The foam concrete is a lightweight wall material containing a large number of closed air holes, which is formed by adding a chemical foaming agent or a physical foaming agent into slurry prepared from a cementing material, an admixture, a modifier and the like after foaming, mixing and stirring, casting and molding, and naturally curing. The wall material has the advantages of small volume weight, good heat insulation performance, good sound insulation and fire resistance performance and the like, and is widely applied to energy-saving wall materials.
Chinese patent CN114538837A discloses a foam concrete formula and a production process: 60-80 parts of cement clinker, 20-25 parts of mineral powder, 15-18 parts of bone glue powder, 8-10 parts of wet-milled nano stone powder, 8-10 parts of sodium dodecyl sulfate, 6-8 parts of thickening agent and 4-6 parts of waterproof agent. Preparing the raw materials into slurry, preparing foam by using a foaming agent, mixing the foam with the slurry, and pouring and maintaining to obtain the foam concrete.
Chinese patent CN112028569A discloses a foam concrete formula and a preparation method and application thereof: 100 to 130 parts of cement, 150 to 200 parts of lightweight aggregate, 30 to 50 parts of fly ash, 50 to 80 parts of water, 8 to 30 parts of TPU particles, 6 to 16 parts of composite foaming agent and 0.2 to 0.6 part of thickening agent. Mixing and stirring TPU particles, a composite foaming agent, a thickening agent and water, and continuing stirring after stirring until bubbles are generated to obtain a foam solution; mixing and stirring the fly ash and the lightweight aggregate, then adding the cement, and continuously stirring to obtain concrete slurry; and mixing and stirring the foam solution and the concrete slurry, and pouring, molding and curing.
The prior art disclosed above has the following disadvantages:
1. the traditional foam concrete is easy to have the phenomenon of film collapse after being formed.
2. The traditional foam concrete has large drying shrinkage rate and is easy to generate cracking risk.
3. The traditional foam concrete is usually naturally cured or steam cured, the curing period is generally 7-28 d, the curing period is long, and high-quality products with high strength and low density are difficult to obtain in a short period.
4. The conventional foam concrete generally uses ordinary cement as a cementing material, the carbon emission in the production process of the ordinary cement is high, and a large amount of carbon dioxide cannot be absorbed in the maintenance process.
Disclosure of Invention
The invention aims to provide a preparation method of novel foam concrete. According to the preparation method of the novel foam concrete, the novel cementing material and the special preparation process are utilized, and the prepared foam concrete has the advantages of high strength, capability of solidifying and sealing carbon dioxide, low dry shrinkage and the like through a carbon dioxide curing mode, and the technical scheme adopted by the invention is as follows:
according to one aspect of the present invention, there is provided a method for preparing a novel foam concrete, comprising the steps of:
(1) Putting the novel special cementing material, the quick-hardening sulphoaluminate cement and water into a stirrer to be stirred for 3-5min, and fully mixing to obtain initial slurry;
(2) Preparing a foaming agent and water into a solution according to the volume ratio of 1;
(3) Uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, wherein the volume ratio of the foam to the initial slurry is controlled to be 5-10;
(4) Pouring the mixed slurry after stirring into a mold, and placing the mold in a concrete carbonization curing box with the normal pressure carbon dioxide concentration of 10-50% for pre-curing for 10-30 min to obtain foam concrete;
(5) Demoulding the foam concrete after pre-curing, and putting the foam concrete in a carbonization kettle with the carbon dioxide partial pressure of 0.1-1.0 MPa at normal temperature for carbonization and curing for 0.5-2 h to obtain a finished product.
Preferably, the novel special cementing material is prepared by the following method:
mixing one or two of limestone with calcium oxide content more than 52% and kaolin or sandstone with silicon dioxide content more than 90% according to the calcium-silicon molar ratio of 1.5-2.0;
grinding the mixed raw materials to the specific surface area of 370-450 m 2 /kg；
Heating the ground raw materials to 1350-1400 ℃ from normal temperature at the speed of 10 ℃/min in a high-temperature furnace, preserving the heat at 1350-1400 ℃ for 1-4 h, and then cooling to normal temperature at the cooling rate of 2-5 ℃/min to obtain the novel special cementing material.
Preferably, the foam concrete is prepared from the following raw materials in parts by weight: 60-80 parts of novel special cementing material, 10-15 parts of fast hardening sulphoaluminate cement, 20-40 parts of water and foaming agent.
Preferably, the foaming agent is one or more of an HTQ-1 type compound animal protein foaming agent, a plant type foaming agent and a compound type foaming agent.
The technical scheme adopted by the invention has the following remarkable effects:
(1) In the preparation process of the novel foam concrete, the novel special cementing material is adopted, compared with common cement, the novel foam concrete has high carbonization strength and low shrinkage rate, the strength of the foam concrete is ensured, and the drying shrinkage rate of the foam concrete is reduced;
(2) According to the preparation method of the novel foam concrete, the special preparation and maintenance processes can give full play to the activity of the special cementing material, so that the performance of the foam concrete is ensured;
(3) The preparation and maintenance period of the traditional foam concrete is generally 7-28 days. The preparation and maintenance process of the novel foam concrete preparation method only needs 1-3 h, so that the time is greatly shortened, and the production efficiency is improved;
(4) In the preparation process of the novel foam concrete, carbon dioxide is required for maintenance, and a new road is explored for realizing 'carbon neutralization' in the concrete industry.
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 below with reference to preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
Example 1:
a preparation method of novel foam concrete comprises the following steps:
mixing limestone with calcium oxide content of 52% and sandstone with silicon dioxide content of 95% according to the calcium-silicon molar ratio of 1.5; grinding the mixed raw materials to a specific surface area of 380m 2 Per kg; heating the ground raw materials to 1350 ℃ from normal temperature at a speed of 10 ℃/min in a high-temperature furnace, preserving heat at 1350 ℃ for 2h, and then cooling to normal temperature at a cooling rate of 2 ℃/min to obtain a novel special cementing material;
80 parts of the novel special cementing material, 10 parts of quick-hardening sulphoaluminate cement and 10 parts of water are put into a stirrer to be stirred for 4min and are fully mixed to prepare initial slurry;
preparing a foaming agent and water into a solution according to a volume ratio of 1;
uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, wherein the volume ratio of the foam to the initial slurry is controlled to be 10;
pouring the mixed slurry after stirring into a mold, placing the mold in a concrete carbonization curing box with the normal pressure carbon dioxide concentration of 10 percent for precuring for 30min to obtain foam concrete;
and (3) demoulding the foam concrete after the pre-curing, and putting the foam concrete in a carbonization kettle with the normal temperature and the carbon dioxide partial pressure of 0.2MPa for carbonization and curing for 1 hour to obtain a finished product.
Example 2:
a preparation method of novel foam concrete comprises the following steps:
mixing limestone with calcium oxide content of 53% and sandstone with silicon dioxide content of 90% according to the calcium-silicon molar ratio of 1.8; grinding the mixed raw materials to a specific surface area of 400m 2 (iv) kg; heating the ground raw materials to 1350 ℃ from normal temperature at a speed of 10 ℃/min in a high-temperature furnace, preserving heat for 3 hours at 1350 ℃, and then cooling to normal temperature at a cooling rate of 3 ℃/min to obtain a novel special cementing material;
75 parts of the novel special cementing material, 12 parts of quick-hardening sulphoaluminate cement and 25 parts of water are put into a stirrer to be stirred for 5min, and the materials are fully mixed to prepare initial slurry;
preparing a foaming agent and water into a solution according to a volume ratio of 1;
uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, wherein the volume ratio of the foam to the initial slurry is controlled to be 8;
pouring the mixed slurry after stirring into a mold, placing the mold in a concrete carbonization curing box with the normal pressure carbon dioxide concentration of 15 percent for pre-curing for 20min to obtain foam concrete;
and (3) demoulding the foam concrete after the pre-curing, and putting the foam concrete in a carbonization kettle with the normal temperature and the carbon dioxide partial pressure of 0.3MPa for carbonization and curing for 1 hour to obtain a finished product.
Example 3:
a preparation method of novel foam concrete comprises the following steps:
mixing limestone with a calcium oxide content of 53%, kaolin with a silicon dioxide content of 90% and sandstone (1 by mass ratio; grinding the mixed raw materials to a specific surface area of 420m 2 (iv) kg; heating the ground raw materials to 1400 ℃ from normal temperature at a speed of 10 ℃/min in a high-temperature furnace, preserving heat at 1400 ℃ for 1h, and then cooling to normal temperature at a cooling rate of 2 ℃/min to obtain a novel special cementing material;
putting 70 parts of the novel special cementing material, 13 parts of fast hardening sulphoaluminate cement and 28 parts of water into a stirrer to be stirred for 5min, and fully mixing to prepare initial slurry;
preparing a foaming agent and water into a solution according to a volume ratio of 1;
uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, wherein the volume ratio of the foam to the initial slurry is controlled to be 7;
pouring the mixed slurry after stirring into a mold, placing the mold in a concrete carbonization curing box with the carbon dioxide concentration of 30% at normal pressure for precuring for 10min to obtain foam concrete;
and (3) demoulding the foam concrete after the pre-curing, and putting the foam concrete in a carbonization kettle with the normal temperature and the carbon dioxide partial pressure of 0.4MPa for carbonization and curing for 0.5h to obtain a finished product.
Comparative example 1:
preparation method of novel foam concrete
1.1 raw materials: compared with the example 1, the novel special cementing material is replaced by P.C 42.5 cement in the raw material of the comparative example 1.
1.2 the preparation method comprises the following steps: the same as in example 1.
Comparative example 2:
preparation method of novel foam concrete
2.1, raw materials: in comparison with example 2, no rapid hardening sulphoaluminate cement was used in the raw material of comparative example 1.
2.2 the preparation method comprises the following steps: the same as in example 2.
Comparative example 3:
preparation method of novel foam concrete
3.1 raw materials: the same as in example 3.
3.2 the preparation method comprises the following steps: in comparison with example 3, no precuring was carried out.
Comparative example 4:
preparation method of novel foam concrete
41, raw materials: the same as in example 3.
4.2 the preparation method comprises the following steps: in comparison with example 3, the curing in the autoclave was not carried out.
The dry density and compressive strength of the foam concrete were measured according to JG/T266-2011 "foam concrete". GB/T11969-2020 autoclaved aerated concrete Performance test method determines the drying shrinkage of the foam concrete. Drying the foam concrete test block in an oven at 55 ℃ to constant weight, grinding the test block by using a vibration mill, calcining the test block in an electric furnace at 500 ℃ to constant weight, calcining the test block in an electric furnace at 900 ℃ to constant weight, and calculating the carbon fixation amount of the foam concrete according to the mass difference of the two times. The results are shown in Table 1.
TABLE 1
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (4)
1. A preparation method of novel foam concrete is characterized by comprising the following steps: the method comprises the following steps:
(1) Putting the novel special cementing material, the quick-hardening sulphoaluminate cement and water into a stirrer to be stirred for 3-5min, and fully mixing to obtain initial slurry;
(2) Preparing a foaming agent and water into a solution according to the volume ratio of 1;
(3) Uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, wherein the volume ratio of the foam to the initial slurry is controlled to be 5-10;
(4) Pouring the mixed slurry after stirring into a mold, and placing the mold in a concrete carbonization curing box with the normal pressure carbon dioxide concentration of 10-50% for pre-curing for 10-30 min to obtain foam concrete;
(5) And (3) demoulding the foam concrete after the pre-curing, and putting the foam concrete in a carbonization kettle with the carbon dioxide partial pressure of 0.1-1.0 MPa at normal temperature for carbonization and curing for 0.5-2 hours to obtain a finished product.
2. The method for preparing a novel foam concrete according to claim 1, characterized in that: the novel special cementing material is prepared by the following method:
mixing one or two of limestone with calcium oxide content more than 52% and kaolin or sandstone with silicon dioxide content more than 90% according to the calcium-silicon molar ratio of 1.5-2.0;
grinding the mixed raw materials to the specific surface area of 370-450 m 2 /kg；
Heating the ground raw materials to 1350-1400 ℃ from normal temperature at a speed of 10 ℃/min in a high-temperature furnace, preserving the heat at 1350-1400 ℃ for 1-4 h, and then cooling to normal temperature at a cooling rate of 2-5 ℃/min to obtain the novel special cementing material.
3. A novel foam concrete is characterized in that: the foam concrete is prepared from the following raw materials in parts by weight: 60-80 parts of novel special cementing material, 10-15 parts of fast hardening sulphoaluminate cement, 20-40 parts of water and foaming agent.
4. A new type of foamed concrete according to claim 3, characterized in that: the foaming agent is one or more of an HTQ-1 type composite animal protein foaming agent, a plant type foaming agent and a composite foaming agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210895977.9A CN115180907B (en) | 2022-07-27 | 2022-07-27 | Preparation method of foam concrete |
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| CN202210895977.9A CN115180907B (en) | 2022-07-27 | 2022-07-27 | Preparation method of foam concrete |
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| CN115180907A true CN115180907A (en) | 2022-10-14 |
| CN115180907B CN115180907B (en) | 2023-05-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116199463A (en) * | 2023-03-13 | 2023-06-02 | 华润水泥技术研发有限公司 | Foam concrete prepared from air hardening cementing material and preparation method thereof |
| CN116199483A (en) * | 2023-03-13 | 2023-06-02 | 华润水泥技术研发有限公司 | Preparation method of carbon-fixing foam concrete |
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| CN112979252A (en) * | 2019-12-13 | 2021-06-18 | 湖北工业大学 | Self-insulation system foam concrete and preparation method thereof |
| CN113955992A (en) * | 2021-10-28 | 2022-01-21 | 山东汉博昱洲新材料有限公司 | Efficient carbon-absorbing mineralized aerated concrete and preparation method thereof |
| CN113968701A (en) * | 2021-10-28 | 2022-01-25 | 山东汉博昱洲新材料有限公司 | CO (carbon monoxide)2Light concrete for driving consolidation and preparation method thereof |
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2022
- 2022-07-27 CN CN202210895977.9A patent/CN115180907B/en active Active
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| JP2014043379A (en) * | 2012-08-27 | 2014-03-13 | Asahi Kasei Construction Materials Co Ltd | Manufacturing method of light-weight foam concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116199463A (en) * | 2023-03-13 | 2023-06-02 | 华润水泥技术研发有限公司 | Foam concrete prepared from air hardening cementing material and preparation method thereof |
| CN116199483A (en) * | 2023-03-13 | 2023-06-02 | 华润水泥技术研发有限公司 | Preparation method of carbon-fixing foam concrete |
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