CN115180907B - Preparation method of foam concrete - Google Patents
Preparation method of foam concrete Download PDFInfo
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- CN115180907B CN115180907B CN202210895977.9A CN202210895977A CN115180907B CN 115180907 B CN115180907 B CN 115180907B CN 202210895977 A CN202210895977 A CN 202210895977A CN 115180907 B CN115180907 B CN 115180907B
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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
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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
- C04B40/0231—Carbon dioxide hardening
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a preparation method of novel foam concrete. Firstly, putting a novel special cementing material, sulphoaluminate cement and water into a stirrer to stir for 3-5min, and fully mixing to prepare initial slurry; preparing a foaming agent and water into a solution according to the volume ratio of 1:50, and preparing the foaming agent into foam by using a foaming agent machine; uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, and controlling the volume ratio of the foam to the initial slurry to be 5-10:1; pouring the stirred mixed slurry 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; demolding the foam concrete after the pre-curing, and carbonizing and curing in a carbonizing kettle with the normal temperature and the carbon dioxide partial pressure of 0.1-1.0 MPa for 0.5-2 h to obtain the finished product. The invention uses the novel cementing material and the special preparation process, and the prepared foam concrete has the advantages of high strength, capability of solidifying and sealing carbon dioxide, low dry shrinkage and the like in 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 foam concrete.
Background
The foam concrete is a light wall material containing a large number of closed pores, 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, stirring, casting and naturally curing. The heat insulation 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 formulation and production process: 60-80 parts of cement clinker, 20-25 parts of ore powder, 15-18 parts of bone rubber powder, 8-10 parts of wet grinding nano stone powder, 8-10 parts of sodium dodecyl sulfate, 6-8 parts of a thickening agent and 4-6 parts of a waterproofing agent. And (3) preparing the raw materials in parts into slurry, preparing foam by using a foaming agent, mixing with the slurry, and pouring and curing to obtain the foam concrete.
Chinese patent CN112028569a discloses a foam concrete formulation, and preparation method and application thereof: 100-130 parts of cement, 150-200 parts of lightweight aggregate, 30-50 parts of fly ash, 50-80 parts of water, 8-30 parts of TPU particles, 6-16 parts of composite foaming agent and 0.2-0.6 part of thickener. Mixing and stirring TPU particles, a composite foaming agent, a thickening agent and water, and continuing stirring after bubbles are generated to obtain a foam solution; mixing and stirring the fly ash and the lightweight aggregate, and then adding cement to continuously stir 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 collapse after being molded.
2. The traditional foam concrete has larger drying shrinkage rate and is easy to generate cracking risk.
3. The traditional foam concrete is usually cured naturally or cured by steaming, 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 common cement as a cementing material, carbon emission is high in the common cement production process, and a large amount of carbon dioxide cannot be absorbed in the curing process.
Disclosure of Invention
The invention aims to provide a preparation method of foam concrete. According to the preparation method of the 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 in a carbon dioxide curing mode, and the technical scheme adopted by the invention is as follows:
according to an aspect of the present invention, there is provided a method for preparing foam concrete, comprising the steps of:
(1) Placing the novel special cementing material, the quick hardening sulphoaluminate cement and water into a stirrer to stir for 3-5min, and fully mixing to prepare initial slurry;
(2) Preparing a foaming agent and water into a solution according to the volume ratio of 1:50, and preparing the foaming agent into foam by using a foaming agent machine;
(3) Uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, and controlling the volume ratio of the foam to the initial slurry to be 5-10:1;
(4) Pouring the stirred mixed slurry 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 to obtain foam concrete;
(5) Demolding the foam concrete after the pre-curing, and carbonizing and curing in a carbonizing kettle with the normal temperature and the carbon dioxide partial pressure of 0.1-1.0 MPa for 0.5-2 h to obtain the 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 molar ratio of calcium to silicon of 1.5-2.0;
grinding the mixed raw materials to a 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 heat for 1-4 h at 1350-1400 ℃, and cooling to normal temperature at a cooling speed 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 quick hardening sulphoaluminate cement, 20-40 parts of water and a foaming agent.
Preferably, the foaming agent is one or more of HTQ-1 type composite animal protein foaming agent, plant foaming agent and composite foaming agent.
The technical scheme adopted by the invention has the following remarkable effects:
(1) In the preparation process of the foam concrete, the novel special cementing material is adopted, so that compared with ordinary cement, the carbonization strength is high, the shrinkage rate is low, 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 foam concrete, the special preparation and maintenance process can fully exert the activity of the special cementing material, so that the performance of the foam concrete is ensured;
(3) The preparation and curing period of the traditional foam concrete is generally 7-28 d. The preparation method of the foam concrete only needs 1-3 hours in the preparation and maintenance processes, so that the time is greatly shortened, and the production efficiency is improved;
(4) In the preparation process of the foam concrete, the maintenance is needed by using carbon dioxide, so that 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 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.
Example 1:
a preparation method of foam concrete comprises the following steps:
mixing limestone with 52% of calcium oxide and sandstone with 95% of silicon dioxide according to the molar ratio of calcium to silicon of 1.5; grinding the mixed raw materials to a specific surface area of 380m 2 /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 2 hours, and cooling to normal temperature at a cooling speed of 2 ℃/min to obtain a novel special cementing material;
placing 80 parts of novel special cementing material, 10 parts of quick hardening sulphoaluminate cement and 10 parts of water into a stirrer to stir for 4min, and fully mixing to prepare initial slurry;
preparing a foaming agent and water into a solution according to the volume ratio of 1:50, and preparing the foaming agent into foam by using a foaming agent machine;
uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, and controlling the volume ratio of the foam to the initial slurry to be 10:1;
pouring the stirred mixed slurry into a mould, and placing the mould into a concrete carbonization curing box with the normal pressure carbon dioxide concentration of 10 percent for pre-curing for 30 minutes to obtain foam concrete;
demolding the foam concrete after the pre-curing, and carbonizing and curing for 1h in a carbonizing kettle with normal temperature and carbon dioxide partial pressure of 0.2MPa to obtain a finished product.
Example 2:
a preparation method of foam concrete comprises the following steps:
mixing limestone with 53% of calcium oxide and sandstone with 90% of silicon dioxide according to the molar ratio of calcium to silicon of 1.8; grinding the mixed raw materials to a specific surface area of 400m 2 /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 3 hours, and cooling to normal temperature at a cooling speed of 3 ℃/min to obtain a novel special cementing material;
75 parts of 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 raw materials are fully mixed to prepare initial slurry;
preparing a foaming agent and water into a solution according to the volume ratio of 1:50, and preparing the foaming agent into foam by using a foaming agent machine;
uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, and controlling the volume ratio of the foam to the initial slurry to be 8:1;
pouring the stirred mixed slurry into a mould, and placing the mould into a concrete carbonization curing box with the normal pressure carbon dioxide concentration of 15% for pre-curing for 20min to obtain foam concrete;
demolding the foam concrete after the pre-curing, and carbonizing and curing for 1h in a carbonizing kettle with normal temperature and carbon dioxide partial pressure of 0.3MPa to obtain a finished product.
Example 3:
a preparation method of foam concrete comprises the following steps:
mixing limestone with 53% of calcium oxide content, kaolin with 90% of silicon dioxide content and sandstone (mass ratio 1:1) according to the ratio of calcium to silicon of 2.0; grinding the mixed raw materials to a specific surface area of 420m 2 /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 cooling to normal temperature at a cooling speed of 2 ℃/min to obtain a novel special cementing material;
70 parts of novel special cementing material, 13 parts of quick hardening sulphoaluminate cement and 28 parts of water are put into a stirrer to be stirred for 5min, and the raw materials are fully mixed to prepare initial slurry;
preparing a foaming agent and water into a solution according to the volume ratio of 1:50, and preparing the foaming agent into foam by using a foaming agent machine;
uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, and controlling the volume ratio of the foam to the initial slurry to be 7:1;
pouring the stirred mixed slurry into a mould, and placing the mould into a concrete carbonization curing box with the normal pressure carbon dioxide concentration of 30 percent for pre-curing for 10 minutes to obtain foam concrete;
demolding the foam concrete after the pre-curing, and carbonizing and curing in a carbonizing kettle with the normal temperature and the carbon dioxide partial pressure of 0.4MPa for 0.5h to obtain a finished product.
Comparative example 1:
preparation method of foam concrete
1.1 raw materials: compared with the example 1, the novel special cementing material is replaced by P.C42.5 cement in the raw material of the comparative example 1.
1.2 preparation method: as in example 1.
Comparative example 2:
preparation method of foam concrete
2.1 raw materials: in comparison with example 2, the rapid hardening sulphoaluminate cement was not used in the raw material of comparative example 1.
2.2 preparation method: as in example 2.
Comparative example 3:
preparation method of foam concrete
3.1 raw materials: same as in example 3.
3.2 preparation method: in comparison with example 3, no pre-curing was performed.
Comparative example 4:
preparation method of foam concrete
41 raw materials: same as in example 3.
4.2 preparation method: compared with example 3, the curing in the carbonization kettle is not performed.
The dry density and compressive strength of the foam concrete were determined according to JG/T266-2011. GB/T11969-2020 autoclaved aerated concrete Performance test method determines the drying shrinkage of foam concrete. And (3) drying the foam concrete test block in an oven at 55 ℃ to constant weight, grinding by using a vibration mill, calcining in an electric furnace at 500 ℃ to constant weight, calcining in the electric furnace at 900 ℃ to constant weight, and taking the difference of the mass of the foam concrete before and after the solid carbon content of the foam concrete is calculated. The results are shown in Table 1.
TABLE 1
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 (2)
1. A preparation method of foam concrete is characterized in that: the method comprises the following steps:
(1) Placing the novel special cementing material, the quick hardening sulphoaluminate cement and water into a stirrer to stir for 3-5min, and fully mixing to prepare initial slurry;
(2) Preparing a foaming agent and water into a solution according to the volume ratio of 1:50, and preparing the foaming agent into foam by using a foaming agent machine;
(3) Uniformly mixing the prepared initial slurry with foam to prepare mixed slurry, and controlling the volume ratio of the foam to the initial slurry to be 5-10:1;
(4) Pouring the stirred mixed slurry 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 to obtain foam concrete;
(5) Demolding the foam concrete after the pre-curing, and carbonizing and curing in a carbonizing kettle with the normal temperature and the carbon dioxide partial pressure of 0.1-1.0 MPa for 0.5-2 h to obtain a finished product;
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 molar ratio of calcium to silicon of 1.5-2.0;
grinding the mixed raw materials to a 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 heat for 1-4 h at 1350-1400 ℃, and cooling to normal temperature at a cooling speed of 2-5 ℃/min to obtain a novel special cementing material;
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 quick hardening sulphoaluminate cement, 20-40 parts of water and a foaming agent.
2. The method for preparing foam concrete according to claim 1, wherein: the foaming agent is one or more of HTQ-1 type composite animal protein foaming agent, plant foaming agent and 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 CN115180907A (en) | 2022-10-14 |
| CN115180907B true CN115180907B (en) | 2023-05-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN108585926A (en) * | 2018-07-12 | 2018-09-28 | 西安建筑科技大学 | A kind of preparation method of foam concrete |
| CN112979252B (en) * | 2019-12-13 | 2022-06-10 | 湖北工业大学 | Self-insulation system foam concrete and preparation method thereof |
| CN113968701B (en) * | 2021-10-28 | 2023-06-30 | 山东汉博昱洲新材料有限公司 | CO (carbon monoxide) 2 Light concrete for driving consolidation and preparation method thereof |
| CN113955992B (en) * | 2021-10-28 | 2023-02-28 | 山东京韵泰博新材料科技有限公司 | Efficient carbon-absorbing mineralized aerated concrete and preparation method thereof |
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