CN114409292A - Enhancement layer, enhancement type lightweight aggregate and preparation method and application thereof - Google Patents
Enhancement layer, enhancement type lightweight aggregate and preparation method and application thereof Download PDFInfo
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- CN114409292A CN114409292A CN202210115742.3A CN202210115742A CN114409292A CN 114409292 A CN114409292 A CN 114409292A CN 202210115742 A CN202210115742 A CN 202210115742A CN 114409292 A CN114409292 A CN 114409292A
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1074—Silicates, e.g. glass
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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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Abstract
The invention belongs to the technical field of concrete, and particularly relates to a reinforcing layer, a reinforced lightweight aggregate, and a preparation method and application thereof. The preparation raw materials of the enhancement layer provided by the invention comprise 6-28 parts of carbon mineralization cementing material, 2-8 parts of water, 0.2-2 parts of carbon mineralization reinforcing agent and 0.3-1.2 parts of water reducing agent; the carbon mineralized gelled material contains calcium. The reinforced lightweight aggregate provided by the invention comprises the lightweight aggregate and a reinforced layer on the surface of the lightweight aggregate. The preparation method of the reinforced lightweight aggregate provided by the invention comprises the following steps: mixing the carbon mineralization cementing material, the carbon mineralization reinforcing agent, the water reducing agent and water to obtain slurry; and (3) wrapping the lightweight aggregate with the slurry, and then carrying out carbon mineralization reaction in a carbon dioxide atmosphere to obtain the enhanced lightweight aggregate. After the carbon mineralization cementing material is subjected to carbon mineralization reaction, calcium carbonate is generated on the surface of the lightweight aggregate, so that the mechanical strength of the lightweight aggregate is effectively improved, and the application range of the lightweight aggregate is expanded.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a reinforcing layer, a reinforced lightweight aggregate, and a preparation method and application thereof.
Background
Modern civil engineering's structure is constantly towards super high, large-span development, and traditional concrete is because from great, can not satisfy the construction demand of super high, large-span etc.. The bulk density of the sandstone aggregate for preparing the traditional concrete is mostly 1500-1800 kg/m3(ii) a The lightweight aggregate means a bulk density of not more than 1200kg/m3The coarse and fine aggregates of (2). The lightweight aggregate can remarkably reduce the self weight of the aggregate due to higher internal porosity, thereby reducing the weight of concrete. All in oneAlong with the national vigorous popularization of the fabricated building, the transportation cost is undoubtedly increased by using a large amount of traditional concrete, and the actual engineering requirements cannot be met. The use of the lightweight aggregate concrete not only lightens the concrete structure and promotes the development of large-scale projects such as high-rise and large-span projects, but also greatly reduces the transportation cost of the concrete.
However, the internal porosity of the lightweight aggregate is high, so that the material strength of the lightweight aggregate is low, and the mechanical property of the concrete is obviously reduced when the lightweight aggregate is used in a high mixing amount, so that the application of the lightweight aggregate concrete is greatly limited.
Disclosure of Invention
In view of the above, the invention provides a reinforced layer, a reinforced lightweight aggregate, a preparation method and an application thereof.
In order to solve the technical problem, the invention provides an enhancement layer, and the preparation raw materials of the enhancement layer comprise the following raw materials:
6-28 parts of carbon mineralization cementing material, 2-8 parts of water, 0.2-2 parts of carbon mineralization reinforcing agent and 0.3-1.2 parts of water reducing agent; the carbon mineralized gelled material contains calcium.
Preferably, the carbon mineralized gelling material comprises calcium silicate, and the calcium silicate comprises one or more of gamma dicalcium silicate, monocalcium silicate and tricalcium disilicate.
Preferably, the carbon mineralization enhancer comprises one or more of chitosan, amorphous siliceous material, polyethylene glycol and polyvinyl alcohol.
The invention provides a reinforced lightweight aggregate, which comprises a lightweight aggregate and a reinforced layer on the surface of the lightweight aggregate, wherein the reinforced layer is the reinforced layer in the technical scheme.
Preferably, the thickness of the reinforcing layer is 1.5-4 mm.
Preferably, the lightweight aggregate comprises one or more of ceramsite, ceramic sand, expanded perlite, pumice, scoria and coal cinder;
the bulk density of the lightweight aggregate is 100-1200 kg/m3；
The mass ratio of the lightweight aggregate to the carbon mineralized cementing material is 100: 6-28.
The invention provides a preparation method of the reinforced lightweight aggregate in the technical scheme, which comprises the following steps:
mixing the carbon mineralization cementing material, the carbon mineralization reinforcing agent, the water reducing agent and water to obtain slurry;
and (3) wrapping the lightweight aggregate with the slurry, and then carrying out carbon mineralization reaction in a carbon dioxide atmosphere to obtain the enhanced lightweight aggregate.
Preferably, the molar ratio of the carbon dioxide to the calcium in the carbon mineralized gelled material is 1-2: 1; the pressure of the carbon dioxide is 0.1-0.3 MPa;
the temperature of the carbon mineralization reaction is 5-90 ℃; the carbon mineralization reaction time is 2-24 h.
Preferably, the mixing comprises the steps of:
carrying out first mixing on a carbon mineralization reinforcing agent, a water reducing agent and water to obtain a first mixed solution;
and carrying out second mixing on the first mixed solution and the carbon mineralized cementing material to obtain the slurry.
The invention provides application of the reinforced lightweight aggregate in the technical scheme or the reinforced lightweight aggregate prepared by the preparation method in the technical scheme in super high-rise, large-span or movable buildings.
The invention provides an enhancement layer, which comprises the following raw materials: 6-28 parts of carbon mineralization cementing material, 2-8 parts of water, 0.2-2 parts of carbon mineralization reinforcing agent and 0.3-1.2 parts of water reducing agent; the carbon mineralized gelled material contains calcium. In the invention, the carbon mineralized gelled material reacts with carbon dioxide to generate calcium carbonate, so that the mechanical strength of the enhancement layer is improved. In the invention, the carbon mineralization enhancer can promote calcium ion dissolution in the carbon mineralization reaction and induce more calcium carbonate to be generated, thereby improving the mechanical strength.
The invention provides a reinforced lightweight aggregate, which comprises a lightweight aggregate and a reinforced layer on the surface of the lightweight aggregate, wherein the reinforced layer is the reinforced layer in the technical scheme. In the invention, the reinforcing layer has higher mechanical strength, the strength of the lightweight aggregate is improved, and the application range of the lightweight aggregate is expanded.
The invention provides a preparation method of the reinforced lightweight aggregate in the technical scheme, which comprises the following steps: mixing the carbon mineralization cementing material, the carbon mineralization reinforcing agent, the water reducing agent and water to obtain slurry; and (3) wrapping the lightweight aggregate with the slurry, and then carrying out carbon mineralization reaction in a carbon dioxide atmosphere to obtain the enhanced lightweight aggregate. In the invention, the carbon mineralized gel material has low hydration activity and high carbonization activity, and the carbon mineralized gel material generates calcium carbonate on the surface of the lightweight aggregate after carbon mineralization reaction, thereby effectively improving the mechanical strength of the lightweight aggregate.
Detailed Description
The invention provides an enhancement layer, which comprises the following raw materials:
6-28 parts of carbon mineralization cementing material, 2-8 parts of water, 0.2-2 parts of carbon mineralization reinforcing agent and 0.3-1.2 parts of water reducing agent; the carbon mineralized gelled material contains calcium.
In the present invention, if it is not specifically stated that the desired raw material is a conventional commercially available product.
In the invention, the preparation raw materials of the enhancement layer comprise 6-28 parts of carbon mineralized gelled material, preferably 9-25 parts, and more preferably 18-23 parts. In the present invention, the carbon mineralized gelling material is preferably calcium silicate, and the calcium silicate preferably includes gamma-dicalcium silicate (gamma-C)2S), monocalcium silicate (CS) and tricalcium disilicate (C)3S2) More preferably gamma-dicalcium silicate or tricalcium disilicate, and still more preferably gamma-dicalcium silicate. In the invention, when the carbon mineralized gelled material is more than two specific substances, the proportion of the specific substances is not specially limited, and any proportion can be adopted. In the present invention, the average particle size of the carbon mineralized cement is preferably<150 μm, more preferably<100 μm. In the invention, the density of the carbon mineralized cementitious material is preferably 2800-3000 kg/m3More preferably 2900 to 2950kg/m3。
Based on the mass parts of the carbon mineralized gelled material, in the invention, the preparation raw material of the enhancement layer comprises 2-8 parts of water, preferably 3-6 parts, and more preferably 4-5 parts.
Based on the mass parts of the carbon mineralized gelled material, in the invention, the preparation raw material of the enhancement layer comprises 0.2-2 parts of carbon mineralized reinforcing agent, preferably 0.5-2 parts, and more preferably 1-1.5 parts. In the present invention, the carbon mineralization enhancer preferably includes one or more of chitosan, amorphous siliceous material, polyethylene glycol and polyvinyl alcohol, more preferably chitosan or polyvinyl alcohol. In the present invention, when the carbon mineralization enhancer is two or more of the above specific substances, the ratio of the specific substances in the present invention is not particularly limited, and any ratio may be used.
Based on the mass parts of the carbon mineralized gelled material, in the invention, the preparation raw material of the enhancement layer comprises 0.3-1.2 parts of water reducing agent, preferably 0.35-1 part, and more preferably 0.72-0.9 part. In the present invention, the water reducing agent is preferably a polycarboxylic acid-based water reducing agent. In the present invention, the water-reducing rate of the polycarboxylic acid water-reducing agent is preferably 20 to 30%, more preferably 23 to 28%.
The invention provides a reinforced lightweight aggregate, which comprises a lightweight aggregate and a reinforced layer on the surface of the lightweight aggregate, wherein the reinforced layer is the reinforced layer in the technical scheme.
In the invention, the reinforced lightweight aggregate comprises lightweight aggregate, and the bulk density of the lightweight aggregate is preferably 100-1200 kg/m3More preferably 428 to 782kg/m3. In the present invention, the lightweight aggregate preferably has a cylinder compressive strength of 4 to 7MPa, more preferably 5 to 6 MPa. In the invention, the particle size of the lightweight aggregate is preferably 10-30 mm, and more preferably 15-20 mm. In the present invention, the lightweight aggregate preferably comprises one or more of ceramsite, ceramic sand, expanded perlite, pumice, scoria and cinder; more preferably ceramsite, scoria or coal cinder, and still more preferably ceramsite. In the invention, the ceramsite is preferably a fly ash ceramsite. In the present invention, when the lightweight aggregate is two or more of the above-mentioned specific substances, the present inventionThe invention has no special limit on the proportion of specific substances, and can adopt any proportion.
In the invention, the mass ratio of the lightweight aggregate to the carbon mineralized gelled material is preferably 100: 6-28, more preferably 100: 9-25, and still more preferably 100: 18-20.
In the invention, the thickness of the reinforcing layer is preferably 1.5-4 mm, more preferably 1.8-3 mm, and even more preferably 2.1-2.5 mm.
The preparation method of the reinforced lightweight aggregate provided by the technical scheme of the invention comprises the following steps:
mixing the carbon mineralization cementing material, the carbon mineralization reinforcing agent, the water reducing agent and water to obtain slurry;
and (3) wrapping the lightweight aggregate with the slurry, and then carrying out carbon mineralization reaction in a carbon dioxide atmosphere to obtain the enhanced lightweight aggregate.
The method mixes the carbon mineralization cementing material, the carbon mineralization reinforcing agent, the water reducing agent and water to obtain slurry. In the present invention, the mixing preferably comprises the steps of:
carrying out first mixing on a carbon mineralization reinforcing agent, a water reducing agent and water to obtain a first mixed solution;
and carrying out second mixing on the first mixed solution and the carbon mineralized cementing material to obtain the slurry.
According to the invention, a carbon mineralization reinforcing agent, a water reducing agent and water are subjected to first mixing to obtain a first mixed solution. The first mixing method is not particularly limited as long as the first and second mixing methods can be uniformly mixed. According to the invention, the carbon mineralization enhancer, the water reducing agent and the water are firstly mixed, so that the carbon mineralization enhancer and the water reducing agent can be uniformly dispersed in the water, and the carbon mineralization enhancer and the water reducing agent can fully exert effects.
After the first mixed solution is obtained, the first mixed solution and the carbon mineralized gelled material are subjected to second mixing to obtain the slurry. In the present invention, the second mixing is preferably performed under the condition of stirring, and the stirring preferably includes the first stirring and the second stirring. In the invention, the rotating speed of the first stirring is preferably 50-80 r/min, and more preferably 60-70 r/min; the first stirring time is preferably 4-8 min, and more preferably 5-7 min. In the invention, the rotation speed of the second stirring is preferably 100-140 r/min, and more preferably 110-130 r/min; the second stirring time is preferably 4-8 min, and more preferably 5-7 min. The invention can be beneficial to the slurry to be better coated on the surface of the lightweight aggregate through the first stirring and the second stirring.
After the slurry is obtained, the slurry is wrapped with the lightweight aggregate and then subjected to carbon mineralization reaction in the carbon dioxide atmosphere to obtain the enhanced lightweight aggregate. The invention has no special requirement on the wrapping mode, and only needs to wrap the slurry on the surface of the lightweight aggregate. In the embodiment of the present invention, the wrapping is preferably performed by mixing the lightweight aggregate and the slurry so that the slurry is adsorbed on the surface of the lightweight aggregate. In the present invention, the thickness of the slurry for coating the lightweight aggregate is preferably 3 to 5mm, and more preferably 3.5 to 4 mm.
In the present invention, the carbon mineralization reaction preferably further comprises: and (4) performing water control treatment on the lightweight aggregate wrapped with the slurry. In the invention, the water content of the product after water control treatment is preferably 10-30%, and more preferably 15-20%. In the invention, the temperature of the water control treatment is preferably 55-65 ℃, and more preferably 58-60 ℃. The time of the water control treatment is not particularly limited, as long as the required water content can be achieved. The invention is beneficial to the carbon mineralization reaction through water control treatment and is beneficial to improving the mechanical strength of the enhancement layer.
In the invention, the molar ratio of the carbon dioxide to the calcium in the carbon mineralized gelled material is preferably 1-2: 1, and more preferably 1.3-1.8: 1. In the present invention, the carbon dioxide is preferably an industrial tail gas, and the industrial tail gas preferably comprises a thermal power plant tail gas, a steel plant tail gas or an industrial kiln tail gas, and more preferably is a thermal power plant tail gas. In the invention, the pressure of the carbon dioxide is preferably 0.1-0.3 MPa, and more preferably 0.15-0.2 MPa; the concentration of the carbon dioxide is preferably 90-99.99%, and more preferably 95-99.9%. In the invention, the temperature of the carbon mineralization reaction is preferably 5-90 ℃, more preferably 10-60 ℃, and further preferably 20-30 ℃; the time of the carbon mineralization reaction is preferably 2-24 hours, and more preferably 4-8 hours. In the invention, the relative humidity of the carbon mineralization reaction is preferably 30-100%, and more preferably 50-80%. The invention has no special requirements on the device for carbon mineralization reaction, and can be realized by adopting the conventional device in the field. In embodiments of the invention, the carbon mineralization reaction is preferably carried out in a carbonisation vessel.
According to the preparation method, carbon mineralization reaction is carried out on carbon dioxide and the carbon mineralization cementing material, the calcium carbonate reinforcing layer is generated on the surface of the light aggregate, the strength of the light aggregate is improved, meanwhile, a large amount of industrial tail gas is utilized, and the preparation method has the characteristics of environmental friendliness.
In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
Mixing 1 part of chitosan, 0.35 part of polycarboxylic acid water reducing agent and 3 parts of water to obtain a mixed solution;
9 parts of the mixture with the density of 2900kg/m3gamma-C having an average particle diameter of 38 μm2S and stirring the mixed solution for 6min at the rotating speed of 60r/min and then stirring for 8min at the rotating speed of 120r/min to obtain slurry;
100 parts of the steel material is added with the steel material, wherein the cylinder pressure intensity is 6.3MPa, and the bulk density is 782kg/m3Mixing the fly ash ceramsite with the particle size of 5-10 mm with the slurry, wrapping the fly ash ceramsite with the slurry with the particle size of 4mm on the surface, and then performing water control treatment at 60 ℃ to enable the water content of the lightweight aggregate wrapped with the slurry to be 15%; carrying out carbon mineralization reaction on the lightweight aggregate subjected to water control treatment in a carbonization kettle for 8 hours to obtain enhanced lightweight aggregate; the temperature of the carbon mineralization reaction is 25 ℃, and the relative humidity of the carbon mineralization reaction environment is 60%; the concentration of carbon dioxide in the carbon mineralization reaction is 99.9%, and the pressure is 0.2 MPa.
Example 2
Mixing 1.5 parts of chitosan, 0.72 part of polycarboxylic acid water reducer and 4.5 parts of water to obtain a mixed solution;
18 portions of the mixture with the density of 2900kg/m3gamma-C having an average particle diameter of 38 μm2S andstirring the mixed solution at a rotating speed of 60r/min for 6min, and then stirring at a rotating speed of 120r/min for 8min to obtain slurry;
100 parts of a steel sheet having a barrel pressure of 5.6MPa and a bulk density of 615kg/m3Mixing the fly ash ceramsite with the particle size of 10-15 mm with the slurry, wrapping the fly ash ceramsite with the slurry with the particle size of 4mm on the surface, and then performing water control treatment at 60 ℃ to enable the water content of the lightweight aggregate wrapped with the slurry to be 15%; carrying out carbon mineralization reaction on the lightweight aggregate subjected to water control treatment in a carbonization kettle for 8 hours to obtain enhanced lightweight aggregate; the temperature of the carbon mineralization reaction is 25 ℃, and the relative humidity of the carbon mineralization reaction environment is 60%; the concentration of carbon dioxide in the carbon mineralization reaction is 99.9%, and the pressure is 0.2 MPa.
Example 3
Mixing 2 parts of chitosan, 1 part of polycarboxylic acid water reducing agent and 6 parts of water to obtain a mixed solution;
25 parts of the mixture with the density of 2900kg/m3gamma-C having an average particle diameter of 38 μm2S and stirring the mixed solution for 6min at the rotating speed of 60r/min and then stirring for 8min at the rotating speed of 120r/min to obtain slurry;
100 parts of a steel sheet having a cylinder pressure of 4.5MPa and a bulk density of 428kg/m3Mixing the fly ash ceramsite with the particle size of 15-20 mm with the slurry, wrapping the fly ash ceramsite with the slurry with the particle size of 4mm on the surface, and then performing water control treatment at 60 ℃ to enable the water content of the lightweight aggregate wrapped with the slurry to be 15%; carrying out carbon mineralization reaction on the lightweight aggregate subjected to water control treatment in a carbonization kettle for 8 hours to obtain enhanced lightweight aggregate; the temperature of the carbon mineralization reaction is 25 ℃, and the relative humidity of the carbon mineralization reaction environment is 60%; the concentration of carbon dioxide in the carbon mineralization reaction is 99%, and the pressure is 0.2 MPa.
The bulk density and the barrel pressure strength of the reinforced lightweight aggregates prepared in examples 1 to 3 were measured according to "lightweight aggregate and test method therefor GB/T17431.2-2010", and the results are shown in table 1.
TABLE 1 bulk density and barrel crush strength of reinforced lightweight aggregates prepared in examples 1 to 3
| Examples | Bulk Density (kg/m)3) | Barrel pressure intensity (MPa) | Thickness of the reinforcing layer (mm) |
| Example 1 | 852 | 7.2 | 2.1 |
| Example 2 | 708 | 6.4 | 2.3 |
| Example 3 | 536 | 5.7 | 2.3 |
As can be seen from Table 1, the reinforced lightweight aggregate provided by the present invention has a low bulk density and a high barrel pressure strength.
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (10)
1. The reinforced layer is characterized in that raw materials for preparing the reinforced layer comprise the following raw materials:
6-28 parts of carbon mineralization cementing material, 2-8 parts of water, 0.2-2 parts of carbon mineralization reinforcing agent and 0.3-1.2 parts of water reducing agent; the carbon mineralized gelled material contains calcium.
2. The reinforcement layer of claim 1, wherein the carbon-mineralized gelling material comprises calcium silicate, and wherein the calcium silicate comprises one or more of gamma-dicalcium silicate, monocalcium silicate, and tricalcium disilicate.
3. The reinforcement layer of claim 1, wherein the carbon mineralization enhancer comprises one or more of chitosan, amorphous siliceous material, polyethylene glycol, and polyvinyl alcohol.
4. A reinforced lightweight aggregate comprising a lightweight aggregate and a reinforcing layer on the surface of the lightweight aggregate, wherein the reinforcing layer is as defined in any one of claims 1 to 3.
5. The reinforced lightweight aggregate according to claim 1, wherein the thickness of the reinforcing layer is 1.5 to 4 mm.
6. The reinforced lightweight aggregate according to claim 4, wherein the lightweight aggregate comprises one or more of ceramsite, ceramic sand, expanded perlite, pumice, scoria and cinder;
the bulk density of the lightweight aggregate is 100-1200 kg/m3；
The mass ratio of the lightweight aggregate to the carbon mineralized cementing material is 100: 6-28.
7. A method of making the reinforced lightweight aggregate of any one of claims 4 to 6, comprising the steps of:
mixing the carbon mineralization cementing material, the carbon mineralization reinforcing agent, the water reducing agent and water to obtain slurry;
and (3) wrapping the lightweight aggregate with the slurry, and then carrying out carbon mineralization reaction in a carbon dioxide atmosphere to obtain the enhanced lightweight aggregate.
8. The preparation method according to claim 7, wherein the molar ratio of the carbon dioxide to the calcium in the carbon mineralized gel material is 1-2: 1; the pressure of the carbon dioxide is 0.1-0.3 MPa;
the temperature of the carbon mineralization reaction is 5-90 ℃; the carbon mineralization reaction time is 2-24 h.
9. The method of claim 7, wherein the mixing comprises the steps of:
carrying out first mixing on a carbon mineralization reinforcing agent, a water reducing agent and water to obtain a first mixed solution;
and carrying out second mixing on the first mixed solution and the carbon mineralized cementing material to obtain the slurry.
10. Use of the reinforced lightweight aggregate according to any one of claims 4 to 6 or the reinforced lightweight aggregate prepared by the preparation method according to any one of claims 7 to 9 in super high-rise, large-span or mobile buildings.
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