CN114919068A - Method for preparing cement-based foam material by using carbon dioxide - Google Patents

Method for preparing cement-based foam material by using carbon dioxide Download PDF

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Publication number
CN114919068A
CN114919068A CN202210525761.3A CN202210525761A CN114919068A CN 114919068 A CN114919068 A CN 114919068A CN 202210525761 A CN202210525761 A CN 202210525761A CN 114919068 A CN114919068 A CN 114919068A
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China
Prior art keywords
cement
carbon dioxide
foam
water
foam material
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林忠财
张一鸣
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Hunan University
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Hunan University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/38—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected both by the action of a fluid and by directly-acting driven mechanical means, e.g. stirring means ; Producing cellular concrete
    • B28C5/381—Producing cellular concrete
    • B28C5/386—Plants; Systems; Methods
    • B28C5/388—Methods
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40—Porous or lightweight materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—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)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

The invention discloses a method for preparing a cement-based foam material by using carbon dioxide. The method comprises the following steps: the method comprises the following steps: adding a foaming agent into water, and stirring at a high speed until foaming to obtain foam water; step two: dry-mixing the cement-based dry material; step three: the foam water is added to the cement-based dry material and stirred and continuously sprayed with a precise dosage of carbon dioxide gas. The time for jetting the carbon dioxide gas is 60-90s, and the concentration of the carbon dioxide gas is 10-99.9%. According to the invention, a certain amount of carbon dioxide gas is added in the stirring process of the cement-based foam material, so that carbon dioxide can be permanently sealed in the cement-based foam material, and the effects of foam stabilization, quick setting and early strength are achieved under the condition that a foam stabilizer is not used. The invention can simply and efficiently prepare the light, high-strength and heat-insulating cement-based foam material and simultaneously reduce the production cost and the building use cost.

Description

Method for preparing cement-based foam material by using carbon dioxide
The technical field is as follows:
the invention relates to the technical field of building materials, in particular to a method for preparing a cement-based foam material by using carbon dioxide.
Background art:
human activities generate large amounts of carbon dioxide, and a very effective solution is to absorb, fix and utilize the carbon dioxide by building materials. Cement-based materials are the most widely used building materials in the world, and research shows that Ca in cement 2+ Can be formed after dissolving carbon dioxide in water
Figure BDA0003644379830000011
Reaction to produce nano-grade CaCO 3 An appropriate agentThe amount of carbon dioxide results in a greatly reduced setting time for the cementitious material and effectively increases the early strength of the cementitious material.
The cement-based foam material as a novel energy-saving environment-friendly building material has the advantages that: has the advantages of low density, light weight, heat preservation, sound insulation, shock resistance and the like. However, since the early strength is low due to the high porosity of the cement-based foam material, the subsequent construction is difficult, and the construction progress is affected by the excessively long setting time. The prior light-weight high-strength cement-based foam material inventions, such as CN 201910553967.5, add a large amount of additives when preparing foam concrete, which undoubtedly increases the manufacturing cost of the foam concrete.
In view of the above-mentioned drawbacks of cement-based foam materials, the present invention utilizes carbon dioxide to improve the properties thereof. The invention has simple and efficient operation steps, the carbon dioxide absorption rate can reach more than 10 percent (the carbon dioxide absorption rate of the common cement-based material is 3-5 percent), the invention has better foam stabilizing effect, improves the heat insulation performance of the material and achieves the purposes of quick setting and early strength of the material.
The invention content is as follows:
the invention aims to stabilize bubbles by using carbon dioxide, improve the heat insulation performance of a cement-based foam material, shorten the setting time, improve the early strength and reduce the cost, and permanently seal the carbon dioxide in the cement-based foam material to relieve the greenhouse effect.
The technical scheme of the invention is as follows: a method for preparing a cement-based foam material using carbon dioxide, comprising the steps of:
the method comprises the following steps: adding 1-3 wt.% of cement foaming agent into water, and stirring at a high speed of 1000-3000r/min for 5-10min until a large amount of uniform light foam is generated in the water to obtain the foam water.
Step two: and (3) dry-mixing the cement-based dry material which takes cement as a main cementing material for 30-90s to obtain a uniform dry-mixed cement-based material.
Step three: and pouring the foam water in the step one into the uniform dry-mixed cement-based material in the step two, stirring for 60-120s, and introducing 0.9-2.0 wt.% of carbon dioxide gas in the mass of cement for 60-90s during stirring.
In the method for preparing a cement-based foam material by using carbon dioxide, the carbon dioxide in the third step is: liquefied and purified carbon dioxide gas with the purity of 99.99 percent; or the following steps: the liquefied and purified carbon dioxide gas with the purity of 99.99 percent is mixed with air prepared in industry to obtain mixed gas, wherein the concentration of the carbon dioxide is more than 10 percent; or the following steps: flue gas recovered from cement plants and/or iron and steel plants, wherein the concentration of carbon dioxide is more than 10%.
In the method for preparing a cement-based foam material by using carbon dioxide, in the first step, the foaming agent can be rosin resin type physical foaming agents, alkyl and alkyl aromatic hydrocarbon sulfonic acids and other types of physical foaming agents.
The method for preparing the cement-based foam material by using the carbon dioxide is characterized in that in the first step, stirring is carried out to obtain uniform, small and dense bubbles with the diameter of 0.5-2.5 mm.
In the second step of the method for preparing the cement-based foam material by using the carbon dioxide, the cement-based dry materials are stirred to be uniformly mixed.
In the method for preparing cement-based foam material by using carbon dioxide, the cement in the cement-based dry material in the second step is ordinary portland cement, and the strength grade of the cement is 42.5, 42.5R, 52.5 or 52.5R.
In the method for preparing the cement-based foam material by using the carbon dioxide, the introduction time of the carbon dioxide gas in the third step is 60-120s, and the gas dosage is 0.9-2.0 wt.% of the cement quality, so that the carbon dioxide gas and the cement clinker are ensured to fully react.
In the third step of the method for preparing the cement-based foam material by using the carbon dioxide, the water-cement ratio of the foam water and the uniform dry-mixed cement-based material after mixing is 0.45-0.6, so that the material is ensured to have the flowability suitable for construction.
Has the beneficial effects that:
compared with the prior art, the invention can effectively and permanently seal the carbon dioxide gas in the cement-based foam material; meanwhile, the setting speed and the early strength of the cement-based foam material are effectively improved, and the heat-insulating property of the cement-based foam material is improved. Compared with the existing cement-based foam material, the cement-based foam material prepared by the carbon dioxide has three advantages.
Firstly, the preparation method can improve the construction and use performance of the cement-based foam material. The introduced carbon dioxide gas reacts with the cement clinker to reduce the surface moisture content and stabilize bubbles, thereby greatly promoting the rapid setting of the cement-based foam material and simultaneously improving the early strength; the carbon dioxide enables air holes in the cement-based foam material to be distributed more uniformly and connected more tightly, and improves the heat insulation performance of the cement-based foam material.
Secondly, the preparation method of the invention can permanently seal up the carbon dioxide. The verification proves that the absorption rate of the carbon dioxide in the preparation method is more than 10 percent (the absorption rate of the carbon dioxide of the common cement-based material is 3-5 percent), and the calcium carbonate generated by the reaction is very stable and can be decomposed only at the high temperature of over 600 ℃, so that the permanent carbon fixation can be realized, and the greenhouse effect can be relieved to a certain extent.
Thirdly, the preparation method of the invention has industrial feasibility. In actual engineering, the invention can be applied to a concrete mixing plant, and cement-based foam materials subjected to pre-carbonization are filled into a concrete tank truck for on-site pouring; the method can also be applied to concrete mixer trucks for carbonization in the transportation process; the preparation can also be carried out on the construction site because the technical operation has no difficulty. Therefore, the carbonization technology of the invention is applied to the production of the ready-mixed commercial cement-based foam material, which is beneficial to developing a new market and generating great economic benefit.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Example 1. A method for preparing a cement-based foam material by using carbon dioxide comprises the following specific implementation steps: accurately weighing water, P.I 42.5 cement and 1 wt.% of polyacrylamide foam stabilizer according to a water-cement ratio of 0.5. Putting the cement and the foam stabilizer into a planetary mixer in advance for dry mixing for 30 s. Then weighing 1 wt.% of alkyl aromatic sulfonic acid foaming agent based on the mass of cement, pouring the foaming agent into water, and stirring at 2000r/min for 5min until the bubbles are uniform, small and dense, and the diameters of the bubbles are 2 mm. And after stirring the foam water, pouring the foam water into a planetary stirrer filled with cement and a foam stabilizer, stirring for 30s at 94r/min, then stirring for 90s at 188r/min, introducing carbon dioxide gas with the purity of 99.99% when stirring for 30s at 188r/min, wherein the introducing time is 60s, and the flow rate is 2.63L/min. Placing the stirred slurry in a steel mould of 40 multiplied by 40mm, vibrating for 5s, sealing by using a black plastic film, naturally curing for 24h, and then demoulding; the test block was placed in a standard curing box at 20 ℃ and 95% relative humidity for 3, 7 and 28 days of age, and the 28 day-old samples were tested for dry density.
To verify the technical effects of the present invention, the control group 1 experiment was set up, the strength test was performed at 1d, 3d, 7d and 28d, and the dry density test was performed on the 28-day-old sample. The experiment of control group 1 differs from example 1 in that: in the control group 1, 4 wt.% of polyacrylamide foam stabilizer of cement mass was added to cement to dry mix for 30 seconds, carbon dioxide gas was not introduced during stirring of foamed cement, and other operating conditions and steps were the same as those in the experimental group. The experimental results are shown in tables 1 and 2: the 1d strength can be improved by 2 percent, the 3d strength can be improved by 75 percent, the 7d strength can be improved by 41 percent, and the 28d strength can be improved by 42 percent by 1 percent; the 28d dry density decreased by 20%.
TABLE 1 foam Cement Net Strength development
Figure BDA0003644379830000041
Relative compression Strength (%). As compression Strength of example 1/compression Strength of control group at same age
TABLE 2 neat foam cement 28d dry density
Control group 1 Example 1
Dry density (kg/m) 3 ) Dry density (kg/m) 3 )
661.23 528.06
Example 2. A method for preparing a cement-based foam material by using carbon dioxide comprises the following specific implementation steps: water and p.i 42.5 cement were accurately weighed in a water cement ratio of 0.5, and the cement was put into a planetary mixer in advance. Then weighing 1 wt.% of alkyl aromatic sulfonic acid foaming agent based on the mass of cement, pouring the foaming agent into water, and stirring at 2000r/min for 5min until bubbles are uniform, small and dense, and the diameter of the bubbles is 2 mm. After stirring the foam water, pouring the foam water into a planetary stirrer filled with cement, firstly stirring for 30s at 94r/min, then stirring for 90s at 188r/min, and introducing carbon dioxide gas with the purity of 99.99% when the stirring is carried out for 30s at 188r/min, wherein the introducing time is 60s, and the flow rate is 3.5L/min. Placing the stirred slurry in a steel mould with the thickness of 40 multiplied by 40mm, vibrating for 5s, sealing by using a black plastic film, naturally curing for 24h, and then demoulding; the test block is placed into a standard curing box with the temperature of 20 ℃ and the relative humidity of 95% for curing to 3, 7 and 28 days of age, and the dry density, the thermal conductivity and the thermogravimetric test are carried out on the sample with the age of 28 days.
To verify the technical effects of the present invention, the control group 2 experiment was set up, strength tests were performed at 1d, 3d, 7d and 28d, and dry density and thermal conductivity tests were performed on 28-day-old samples. The experiment of control group 2 differs from example 2 in that: in the control group 2, 4 wt.% cement mass of polyacrylamide foam stabilizer is added into cement for dry mixing for 30s, carbon dioxide gas is not introduced during stirring of foamed cement, and other operating conditions and steps are the same as those of the experimental group. The results of the experiments are shown in tables 3, 4 and 5: the 1d strength can be improved by 20 percent, the 3d strength can be improved by 133 percent, the 7d strength can be improved by 67 percent, and the 28d strength can be improved by 69 percent by 2 percent; the 28d dry density is reduced by 8%; 28d thermal conductivity decreased by 23%. This example 28d had a carbon dioxide uptake of 9.75%.
TABLE 3 development of foam Cement neat paste Strength
Figure BDA0003644379830000051
Relative compression Strength (%). As compression Strength of example 1/compression Strength of control group at same age
TABLE 4 foam Cement neat paste 28d Dry Density
Control group 2 Example 2
Dry density (kg/m) 3 ) Dry density (kg/m) 3 )
661.23 605.85
TABLE 5 neat foam cement paste 28d thermal conductivity
Control group 2 Example 2
Thermal conductivity (W/m. K) Thermal conductivity (W/m. K)
0.1807 0.1399
TABLE 628 d carbon dioxide absorption of example 2
Carbon dioxide uptake (wt.%) Carbon dioxide uptake (wt.%)
9.03 9.75
The above description is only intended to be part of the specific embodiments of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like made on the design concept of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. A method for preparing a cement-based foam material using carbon dioxide, comprising the steps of:
the method comprises the following steps: adding 1-3 wt.% of physical cement foaming agent into water, and stirring at a high speed of 1000-3000r/min for 5-10min until a large amount of uniform light foam is generated in the water to obtain the foam water.
Step two: and dry-mixing the cement-based dry material which takes cement as a main cementing material for 30-90s to obtain a uniform dry-mixed cement-based material.
Step three: and pouring the foam water in the step one into the uniform dry-mixed cement-based material in the step two, stirring for 60-120s, and introducing carbon dioxide gas with the mass of 0.9-2.0 wt.% of cement for 60-90s during stirring.
2. The method for preparing cement-based foam material by using carbon dioxide as claimed in claim 1, wherein in the third step, the carbon dioxide gas is: liquefied and purified carbon dioxide gas with the purity of 99.99 percent; or the following steps: the liquefied and purified carbon dioxide gas with the purity of 99.99 percent is mixed with air prepared in industry to obtain mixed gas, wherein the concentration of the carbon dioxide is more than 10 percent; or the following steps: flue gas recovered from cement plants and/or iron and steel plants, wherein the concentration of carbon dioxide is above 10%.
3. The method for preparing cement-based foam material by using carbon dioxide as claimed in claim 1, wherein the foaming agent used in the first step is a physical foaming agent of rosin resin type, alkyl and alkyl aromatic sulfonic acid type.
4. The method for preparing cement-based foam material by using carbon dioxide as claimed in claim 1, wherein the water cement ratio of the foam water and the uniform dry-mixed cement-based material after mixing in the third step is 0.45-0.6.
CN202210525761.3A 2022-05-16 2022-05-16 Method for preparing cement-based foam material by using carbon dioxide Pending CN114919068A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116283352A (en) * 2023-04-07 2023-06-23 攀枝花市润泽建材有限公司 Method for preparing aerated concrete by carbon dioxide gas generation and concrete product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116283352A (en) * 2023-04-07 2023-06-23 攀枝花市润泽建材有限公司 Method for preparing aerated concrete by carbon dioxide gas generation and concrete product
CN116283352B (en) * 2023-04-07 2024-02-09 攀枝花市润泽建材有限公司 Method for preparing aerated concrete by carbon dioxide gas generation and concrete product

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