CN114644482A - Preparation method of foamed concrete of alkali-activated system - Google Patents
Preparation method of foamed concrete of alkali-activated system Download PDFInfo
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- CN114644482A CN114644482A CN202210245846.6A CN202210245846A CN114644482A CN 114644482 A CN114644482 A CN 114644482A CN 202210245846 A CN202210245846 A CN 202210245846A CN 114644482 A CN114644482 A CN 114644482A
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- alkali
- activated system
- foamed concrete
- activated
- smoke
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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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Treating Waste Gases (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A preparation method of foamed concrete of an alkali-activated system simultaneously recycles smoke and solid wastes, and comprises the following steps: firstly, uniformly mixing 18-33 parts by weight of water and 9-12 parts by weight of alkali activator to obtain a liquid alkali activator; secondly, taking 13-35 parts by weight of silicate-containing and/or aluminosilicate solid waste and 62-120 parts by weight of aggregate, and uniformly mixing the silicate-containing and/or aluminosilicate solid waste and the aggregate with a liquid alkali activator to obtain alkali-activated system concrete slurry; thirdly, injecting the smoke into the foaming agent to obtain foam containing the smoke; fourthly, uniformly mixing the foam containing the smoke and the alkali-activated system concrete slurry to obtain the foamed concrete slurry of the alkali-activated system; and fifthly, forming and curing the foamed concrete slurry of the alkali-activated system to obtain the foamed concrete of the alkali-activated system. The invention realizes the reutilization of the flue gas and the solid waste, and the carbon dioxide in the flue gas can carry out carbonation reaction in the foamed concrete of the alkali-activated system, thereby enhancing the strength of the foamed concrete from the inside.
Description
Technical Field
The invention relates to the field of preparation of building materials from solid wastes, in particular to a preparation method of foamed concrete of an alkali-activated system.
Background
The solid waste containing silicate and/or aluminosilicate is applied to building materials, and one method for generating low carbon footprint is to form an alkali-activated system through the activation of an alkali activator, and then form the concrete of the alkali-activated system after mixing with aggregate.
Although the industrial flue gas is subjected to desulfurization treatment, a certain amount of carbon dioxide is contained in the industrial flue gas, the carbon dioxide is directly discharged as greenhouse gas, the harm is great, and if the industrial flue gas is sealed in a concrete material, the discharge of the greenhouse gas can be effectively reduced.
The concrete alkalinity of the alkali-activated system is strong, and the carbon dioxide in the industrial flue gas is acidic gas, if the alkali-activated system and the industrial flue gas can be effectively combined, the solid waste and the industrial flue gas can be simultaneously recycled, and the resource waste is reduced.
Disclosure of Invention
The invention provides a preparation method of foamed concrete of an alkali-activated system, which combines industrial flue gas and solid waste and realizes the reutilization of waste gas and solid waste.
The technical scheme adopted by the invention is as follows: a preparation method of foamed concrete of an alkali-activated system comprises the following steps: step one, taking 18-33 parts by weight of water and 9-12 parts by weight of alkali activator, and uniformly mixing to obtain the liquid alkali activator. And step two, taking 13-35 parts by weight of silicate-containing and/or aluminosilicate solid waste and 62-120 parts by weight of aggregate, and uniformly mixing the silicate-containing and/or aluminosilicate solid waste and the aggregate with the liquid alkali activator obtained in the step one to obtain the alkali-activated system concrete slurry. Injecting the smoke into a foaming agent, and obtaining the smoke-containing foam with the density of 42-74 kg/m3 through physical foaming. And step four, uniformly mixing the foam containing the smoke gas obtained in the step three with the alkali-activated system concrete slurry obtained in the step two to obtain the foamed concrete slurry of the alkali-activated system, wherein the foam containing the smoke gas accounts for 50-70% of the volume of the foamed concrete slurry of the alkali-activated system. And step five, molding and curing the foamed concrete slurry of the alkali-activated system obtained in the step four to obtain the foamed concrete of the alkali-activated system.
Further, in the first step, the alkali activator is: one or a mixture of any more of alkali metal hydroxide, alkali metal carbonate, alkali metal silicate and alkali metal sulfate.
Further, in the first step, the alkali activator is a mixture of water glass and sodium hydroxide.
Further, in the second step, the silicate-containing and/or aluminosilicate solid waste is: one or a mixture of any more of silica fume, slag, steel slag, fly ash, activated clay and volcanic ash.
Further, in the second step, the aggregate is: one or a mixture of any more of quartz sand, limestone, vermiculite, perlite, diatomite, mica, foam glass or hollow glass balls.
Further, in the third step, the content of carbon dioxide in the flue gas is not less than 10%.
Further, the foaming agent in the third step is a protein-based foaming agent.
And further, in the fifth step, the foamed concrete slurry of the alkali-activated system is poured and molded into a designed shape, and the foamed concrete of the alkali-activated system is obtained through room temperature curing.
The invention has the beneficial effects that: (1) the preparation method of the foamed concrete of the alkali-activated system can effectively recycle the solid waste and the industrial flue gas at the same time, and realizes the recycling of the solid waste and the waste gas.
(2) The industrial flue gas is introduced into the foaming agent, the foam containing the flue gas is obtained through physical foaming, the foam containing the flue gas is mixed with the concrete slurry of the alkali-activated system, the industrial flue gas is wrapped by the foam, and then the flue gas is further sealed in the concrete slurry of the alkali-activated system, so that the industrial flue gas is effectively prevented from escaping.
(3) The industrial flue gas is sealed in the concrete slurry of the alkali-activated system, the industrial flue gas contains acidic gas carbon dioxide, the concrete slurry of the alkali-activated system has strong alkalinity, the industrial flue gas is in the concrete slurry of the alkali-activated system, and the carbon dioxide in the flue gas can induce a carbonation reaction in the alkali-activated process, so that the carbon dioxide can be sealed and solidified in the foamed concrete of the alkali-activated system.
(4) The foam concrete of the alkali-activated system obtained by the preparation method can effectively reduce the carbon footprint while ensuring the same quality, the same compressive strength and the same durability as the traditional foam concrete.
The invention is further described below by means of specific embodiments.
Detailed Description
The preparation method of the foamed concrete of the alkali-activated system of the embodiment comprises the following steps:
step one, taking 18-33 parts by weight of water and 9-12 parts by weight of alkali activator, and uniformly mixing to obtain the liquid alkali activator. The alkali activator may be: one or a mixture of any more of alkali metal hydroxide, alkali metal carbonate, alkali metal silicate and alkali metal sulfate, and the preferred alkali activator is a mixture of water glass and sodium hydroxide, wherein in the alkali activation reaction, the water glass and the sodium hydroxide have synergistic effect and can effectively activate solid wastes containing silicate and/or aluminosilicate.
And step two, taking 13-35 parts by weight of silicate-containing and/or aluminosilicate solid waste and 62-120 parts by weight of aggregate, and uniformly mixing the silicate-containing and/or aluminosilicate solid waste and the aggregate with the liquid alkali activator obtained in the step one to obtain the alkali-activated system concrete slurry. The silicate-containing and/or aluminosilicate solid waste is as follows: one or a mixture of any more of silica fume, slag, steel slag, fly ash, activated clay and volcanic ash. The aggregate is as follows: one or a mixture of any more of quartz sand, limestone, vermiculite, perlite, diatomite, mica, foam glass or hollow glass balls.
Injecting the smoke into a foaming agent, and obtaining the smoke-containing foam with the density of 42-74 kg/m3 through physical foaming. Preferred foaming agents are protein-based foaming agents. Because the alkali-activated system is highly alkaline, the pH can reach 14, and portland cement is only 12.5 if the foaming agents commonly used for portland cement are utilized in the concrete slurry of the alkali-activated system such as: aluminum powder and hydrogen peroxide, the following conditions can occur: (1) the increase of the alkalinity of the system accelerates the foaming reaction of the aluminum powder and hydrogen peroxide, so that the foaming process is uncontrollable, unstable overlarge bubbles are formed before the slurry is not hardened, and the slurry collapse condition is caused; (2) the selection of aluminum powder as a foaming agent can also destroy the silicon-aluminum ratio in an alkali-activated system and disturb the ratio.
In order to overcome the defect that the chemical foaming agent is applied to an alkali-activated system, the protein-based foaming agent is applied, and then protein-based foam is obtained through physical foaming, so that the foam is controllable and more stable, is beneficial to forming closed pores, and is suitable for preparing a foaming concrete material of the alkali-activated system. Protein-based (e.g., various animal fats) foams, produced by "drying methods": is produced by whipping a mixture of a protein-based foaming agent and water through a plastic mesh and compressed air. This foam made using the "dry method" is more uniform and stable than a foam made using the "wet method" of applying the venturi effect. Another innovative addition to foam production is to bring flue gas into the gas phase of the foam, desulfurize the industrial flue gas and then directly inject the industrial flue gas into the foam generator, so that the flue gas is mixed with compressed air and a foaming agent to obtain the foam containing the flue gas.
And step four, uniformly mixing the foam containing the smoke obtained in the step three with the alkali-activated system concrete slurry obtained in the step two to obtain the foamed concrete slurry of the alkali-activated system, wherein the foam containing the smoke accounts for 50-70% of the volume of the foamed concrete slurry of the alkali-activated system.
And step five, molding and curing the foamed concrete slurry of the alkali-activated system obtained in the step four to obtain the foamed concrete of the alkali-activated system. The foamed concrete slurry of the alkali-activated system can be poured and formed into a designed shape, such as: building blocks in various shapes and sizes, or walls and the like can be cured at room temperature to obtain the foamed concrete material of the alkali-activated system. The foamed concrete product of the alkali-activated system can be used for producing light concrete blocks with the density of 800kg/m3 and 1200kg/m3 and the compressive strength of 1MPa to 10 MPa.
Generally, the content of carbon dioxide in the flue gas is not lower than 10%, so that the flue gas is sealed in the foamed concrete slurry, and in the alkali excitation process, the carbon dioxide in the flue gas and the concrete slurry of an alkali excitation system can generate carbonation reaction in the slurry, so that the strength of the foamed concrete building material is effectively improved from the inside of the foamed concrete building material.
The present invention incorporates industrial fumes into the foaming process, which are encapsulated in the foam, which allows the carbon dioxide containing foam to be cured in the foamed concrete of the alkali-activated system. In addition, in the process of activating the solid waste by the alkali activator, the carbon dioxide can induce a carbonization reaction to generate a mixed system of carbonate and aluminosilicate, and the carbonate and the aluminosilicate have a synergistic effect to generate a better excitation effect, so that a more compact structure and better pore distribution are formed, and the early strength of the foam concrete is improved.
Claims (8)
1. The preparation method of the foamed concrete of the alkali-activated system is characterized by comprising the following steps of:
step one, uniformly mixing 18-33 parts by weight of water and 9-12 parts by weight of alkali activator to obtain a liquid alkali activator;
step two, taking 13-35 parts by weight of silicate-containing and/or aluminosilicate solid waste and 62-120 parts by weight of aggregate, and uniformly mixing the silicate-containing and/or aluminosilicate solid waste and the aggregate with the liquid alkali activator obtained in the step one to obtain alkali-activated system concrete slurry;
step three, injecting the smoke into a foaming agent, and obtaining the material with the density of 42-74 kg/m through physical foaming3The smoke-containing foam of (a);
step four, uniformly mixing the foam containing the smoke obtained in the step three with the alkali-activated system concrete slurry obtained in the step two to obtain foamed concrete slurry of an alkali-activated system, wherein the foam containing the smoke accounts for 50-70% of the volume of the foamed concrete slurry of the alkali-activated system;
and step five, molding and curing the foamed concrete slurry of the alkali-activated system obtained in the step four to obtain the foamed concrete of the alkali-activated system.
2. The method for preparing the foamed concrete of the alkali-activated system according to claim 1, wherein in the first step, the alkali-activating agent is: one or a mixture of any more of alkali metal hydroxide, alkali metal carbonate, alkali metal silicate and alkali metal sulfate.
3. The method for preparing the foamed concrete with the alkali-activated system according to claim 1 or 2, wherein in the first step, the alkali-activated agent is a mixture of water glass and sodium hydroxide.
4. The method for preparing the foamed concrete with the alkali-activated system according to claim 1, wherein in the second step, the silicate and/or aluminosilicate solid wastes are: one or a mixture of any more of silica fume, slag, steel slag, fly ash, activated clay and volcanic ash.
5. The method for preparing the foamed concrete with the alkali-activated system according to claim 1, wherein in the second step, the aggregate is: one or a mixture of any more of quartz sand, limestone, vermiculite, perlite, diatomite, mica, foam glass or hollow glass balls.
6. The method for preparing the foamed concrete of the alkali-activated system according to claim 1, wherein in the third step, the content of carbon dioxide in flue gas is not less than 10%.
7. The method for preparing the foaming concrete of the alkali-activated system according to claim 1, wherein the foaming agent in the third step is a protein-based foaming agent.
8. The method for preparing the alkali-activated system foamed concrete according to claim 1, wherein in the fifth step, the alkali-activated system foamed concrete slurry is cast and molded into a designed shape, and is cured at room temperature to obtain the alkali-activated system foamed concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245846.6A CN114644482A (en) | 2022-03-14 | 2022-03-14 | Preparation method of foamed concrete of alkali-activated system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245846.6A CN114644482A (en) | 2022-03-14 | 2022-03-14 | Preparation method of foamed concrete of alkali-activated system |
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| CN114644482A true CN114644482A (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210245846.6A Withdrawn CN114644482A (en) | 2022-03-14 | 2022-03-14 | Preparation method of foamed concrete of alkali-activated system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016032437A1 (en) * | 2014-08-26 | 2016-03-03 | Halliburton Energy Services, Inc. | Systems and methods for in situ monitoring of cement slurry locations and setting processes thereof |
| CN106380225A (en) * | 2016-08-31 | 2017-02-08 | 中国建筑材料科学研究总院 | Alkali-activated foam concrete and preparation method thereof |
| CN106946509A (en) * | 2017-03-24 | 2017-07-14 | 广州大学 | Alkali-activated carbonatite flyash/slag foam concrete and preparation method thereof |
| CN107285677A (en) * | 2017-08-09 | 2017-10-24 | 中国矿业大学 | Solidification CO is sealed up for safekeeping using foam geopolymer filling mine goaf2Method |
| CN113480248A (en) * | 2021-07-31 | 2021-10-08 | 中国华能集团清洁能源技术研究院有限公司 | Carbon sealing method for foamed concrete |
-
2022
- 2022-03-14 CN CN202210245846.6A patent/CN114644482A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016032437A1 (en) * | 2014-08-26 | 2016-03-03 | Halliburton Energy Services, Inc. | Systems and methods for in situ monitoring of cement slurry locations and setting processes thereof |
| CN106380225A (en) * | 2016-08-31 | 2017-02-08 | 中国建筑材料科学研究总院 | Alkali-activated foam concrete and preparation method thereof |
| CN106946509A (en) * | 2017-03-24 | 2017-07-14 | 广州大学 | Alkali-activated carbonatite flyash/slag foam concrete and preparation method thereof |
| CN107285677A (en) * | 2017-08-09 | 2017-10-24 | 中国矿业大学 | Solidification CO is sealed up for safekeeping using foam geopolymer filling mine goaf2Method |
| CN113480248A (en) * | 2021-07-31 | 2021-10-08 | 中国华能集团清洁能源技术研究院有限公司 | Carbon sealing method for foamed concrete |
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Application publication date: 20220621 |
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