CN117776643A - Ecological porous carbon-fixing concrete based on carbon capture and carbon sequestration and preparation method thereof - Google Patents
Ecological porous carbon-fixing concrete based on carbon capture and carbon sequestration and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 52
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 230000009919 sequestration Effects 0.000 title abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000010881 fly ash Substances 0.000 claims abstract description 30
- 239000006260 foam Substances 0.000 claims abstract description 29
- 239000004088 foaming agent Substances 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 22
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 20
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 20
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 19
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 18
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 13
- 238000003763 carbonization Methods 0.000 claims abstract description 5
- 238000012423 maintenance Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 42
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 36
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 18
- 239000002270 dispersing agent Substances 0.000 claims description 18
- 239000003381 stabilizer Substances 0.000 claims description 18
- 239000004094 surface-active agent Substances 0.000 claims description 18
- 239000005543 nano-size silicon particle Substances 0.000 claims description 17
- 235000012239 silicon dioxide Nutrition 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 14
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000010000 carbonizing Methods 0.000 claims description 10
- 238000005187 foaming Methods 0.000 claims description 10
- 239000001569 carbon dioxide Substances 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 9
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 6
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 6
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 6
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical group CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims description 5
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- MRUAUOIMASANKQ-UHFFFAOYSA-O carboxymethyl-[3-(dodecanoylamino)propyl]-dimethylazanium Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC(O)=O MRUAUOIMASANKQ-UHFFFAOYSA-O 0.000 claims description 3
- 229940075468 lauramidopropyl betaine Drugs 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 239000003469 silicate cement Substances 0.000 abstract description 9
- 239000007787 solid Substances 0.000 abstract description 5
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011381 foam concrete Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an ecological porous carbon-fixing concrete based on carbon capture and carbon sequestration and a preparation method thereof, wherein the porous carbon-fixing concrete comprises 40-70 parts of silicate cement, 0-10 parts of silica fume, 0-10 parts of fly ash, 10-60 parts of calcium hydroxide, 1-5 parts of polyvinyl alcohol, 0.1-0.5 part of polyacrylamide, 0.5-2 parts of nano reinforced foaming agent and 20-50 parts of water, and the preparation method comprises the following steps: preparing a nano reinforced foaming agent, obtaining nano stable foam, preparing foam solid carbon gel material slurry, pouring into a mold, and performing carbonization maintenance and standard maintenance after demolding; the porous carbon-fixing concrete provided by the invention has good mechanical property and carbon-fixing property, can be used in the fields of building, water conservancy, traffic and the like, and can help realize the reduction of hidden carbon emission of building and infrastructure.
Description
Technical Field
The invention relates to ecological porous carbon-fixing concrete, in particular to ecological porous carbon-fixing concrete based on carbon capture and carbon sequestration, and also relates to a preparation method of the carbon-fixing concrete.
Background
The problems of global warming and climate deterioration caused by industrial development and human activities are becoming more serious, the concentration of carbon dioxide in the atmosphere is rising year by year, and the ecological environment is facing a great challenge. To solve the problem of rising carbon dioxide concentration in the atmosphere, carbon capture, sequestration and utilization (CCUS) techniques are of great interest. Meanwhile, the building material field is also subjected to high pressure of carbon emission reduction, and the carbon-fixed concrete is highly focused and rapidly developed. The most common application of carbon capture and carbon sequestration in building materials is the curing of CO by early carbonization 2 And the accelerated carbonation reaction is carried out on the concrete test piece, so that stable carbonate is generated to fill the initial pores, the concrete structure is compact, the mechanical property is improved, and the durability is improved.
The common concrete has low porosity and CO in the carbonization process 2 The diffusion from outside to inside is limited by the matrix, resulting in low carbon fixation efficiency. The foam concrete is a lightweight, heat-insulating and fireproof concrete material with higher porosity, which is beneficial to CO 2 And (5) gas diffusion. However, the traditional foam porous concrete has low total carbon fixation amount due to the low content of carbon fixation components in the foam porous concrete. In addition, the foam stability of the foam porous concrete is poor, shrinkage and deformation are easy to occur, so that the air holes in the foam concrete are unevenly distributed, and stress concentration is easy to occur when load is applied, so that the foam concrete is damaged. At present, calcium hydroxide obtained by low-energy production is used as a carbon-fixing component of carbon-fixing concrete,increasingly, however, the introduction of the carbon-fixing material into concrete as a raw material causes the strength of the concrete to be reduced, and the phenomenon is more obvious in porous concrete, so that the application of the carbon-fixing material in a porous concrete system is limited, and the carbon-fixing concrete has the problems of low carbon-fixing efficiency and reduced mechanical property after the introduction of carbon-fixing components.
Disclosure of Invention
The invention aims to: the invention aims to provide an ecological porous carbon-fixing concrete based on carbon capture and carbon sequestration, which has the functions of carbon capture and carbon sequestration, strong mechanical property and high carbon fixation amount, and also provides a preparation method of the carbon-fixing concrete.
The technical scheme is as follows: the ecological porous carbon-fixing concrete based on carbon capture and carbon sealing comprises 40-70 parts of cement, 0-10 parts of silica fume, 0-10 parts of fly ash, 10-60 parts of calcium hydroxide, 1-5 parts of polyvinyl alcohol, 0.1-0.5 part of polyacrylamide, 0.5-2 parts of nano modified foaming agent and 20-50 parts of water.
Wherein the nano modified foaming agent comprises 4-6 parts of nano silicon dioxide, 1-3 parts of nano titanium dioxide, 5-8 parts of surfactant, 5-8 parts of dispersing agent, 1-2 parts of stabilizer and 80-90 parts of water.
The preparation method of the carbon-fixed concrete comprises the following steps:
(1) Adding nano silicon dioxide and nano titanium dioxide into water for stirring and ultrasonic dispersion treatment, adding a dispersing agent for continuous stirring, and adding a surfactant and a stabilizing agent for continuous stirring after the aggregate in the suspension is completely dispersed to prepare a nano modified foaming agent;
(2) Taking a nano modified foaming agent, diluting, and then compressing and foaming to obtain nano stable foam;
(3) Adding cement, silica fume, fly ash, calcium hydroxide, polyvinyl alcohol, polyacrylamide and water into a stirrer for mixing and stirring to obtain a cementing material slurry;
(4) Adding the nano stable foam into the gel material slurry body, stirring to obtain a foam carbon-fixing gel material slurry body, pouring, solidifying, demoulding, carbonizing and curing, and performing standard curing to obtain the ecological porous carbon-fixing concrete based on carbon capture and carbon sealing.
Wherein in the step (1), the ultrasonic dispersion time is 20-30 minutes, the stirring time is 20-40 minutes, and the stirring temperature is 50-55 ℃.
In the step (1), the nano silicon dioxide is hydrophobic, the surfactant is cocamidopropyl betaine or lauramidopropyl betaine, the stabilizer is hydroxypropyl methylcellulose, and the dispersing agent is polyethylene glycol 2000.
Wherein in the step (2), the nano modified foaming agent is diluted by 15-20 times by water.
Wherein in the step (2), the foaming pressure of the air compressor is 0.35-0.45 Mpa.
In the step (3), the cement is P.II 42.5R-grade Portland cement; the fly ash is I-grade fly ash or II-grade fly ash; the fineness of the calcium hydroxide is 100-300 meshes; the polymerization degree of the polyvinyl alcohol is 1700; the molecular weight of the polyacrylamide is 2000-2500 ten thousand.
In the step (4), the carbonization maintenance is carried out for 12-24 hours, the temperature is 15-25 ℃, the humidity is 95-99%, and the carbon dioxide concentration is 50-80%.
In the step (4), the standard curing is carried out for 15-30 days at 15-25 ℃ with the humidity of 50-99%.
The principle of the invention: the porous carbon-fixing concrete of the invention has better mechanical property and carbon-fixing property, the nano-stabilization foam prepared by the nano-modification foaming agent realizes the porosification of the concrete, and the porous structure formed by the ultra-stabilization foam has uniform distribution, which is beneficial to CO 2 Diffusion and rapid reaction with the carbon-fixing component, thereby improving the carbon-fixing efficiency. Meanwhile, based on a high-performance additive technology, through the synergistic effect of polyvinyl alcohol and polyacrylamide, the strength and carbon dioxide adsorption sites of the composite polymer film are improved, and the carbon fixing performance of the porous carbon fixing concrete is improved while the better mechanical performance is maintained; the auxiliary power assisting device is applied to the fields of construction, water conservancy, traffic and the like, and the auxiliary power assisting device can reduce the hidden carbon emission of construction and infrastructure.
The beneficial effects are that: the invention and the prior artCompared with the operation, the method has the following advantages: (1) The concrete is made porous by the ultra-stable foam, and the porous structure formed by the ultra-stable foam is uniformly distributed, which is beneficial to CO 2 Diffusion and rapid reaction with carbon-fixing components, so that the carbon-fixing efficiency is improved, and the carbon-fixing amount in 12 hours is obviously improved; (2) Based on the high-performance additive technology, the carbon fixation performance of the porous carbon fixation concrete is improved through the synergistic effect of the polyvinyl alcohol and the polyacrylamide, and meanwhile, the better mechanical performance can be maintained.
Detailed Description
The raw materials of the invention are all commercially available, and the technical scheme of the invention is further described below by combining specific examples.
Example 1
An ecological porous carbon-fixing concrete based on carbon capture and carbon sequestration comprises the following components in parts by mass: 50 parts of silicate cement; 5 parts of silica fume; 5 parts of fly ash; 40 parts of calcium hydroxide; 2 parts of polyvinyl alcohol; 0.2 parts of polyacrylamide; 0.6 part of nano modified foaming agent and 50 parts of water;
the nano modified foaming agent comprises the following components in mass: 4 parts of nano silicon dioxide, 2 parts of nano titanium dioxide, 6 parts of surfactant, 6 parts of dispersing agent, 1 part of stabilizer and 85 parts of water.
The preparation method of the ecological porous carbon-fixing concrete comprises the following steps:
(1) Adding nano silicon dioxide and nano titanium dioxide into water for stirring and ultrasonic dispersion treatment, wherein the ultrasonic dispersion time is 20 minutes, the stirring time is 25 minutes, the stirring temperature is 50 ℃, then adding a dispersing agent for continuous stirring, after the aggregate in the suspension is completely dispersed, adding a surfactant and a stabilizing agent for continuous stirring, thus obtaining a nano modified foaming agent, wherein the nano silicon dioxide is hydrophobic, the surfactant is cocamidopropyl betaine, the stabilizing agent is hydroxypropyl methyl cellulose, and the dispersing agent is polyethylene glycol 2000;
(2) Diluting the nano modified foaming agent by 15 times with water, and using an air compressor for compression foaming, wherein the foaming pressure of the air compressor is 0.35Mpa, so as to obtain nano stable foam;
(3) Adding cement, silica fume, fly ash, calcium hydroxide, polyvinyl alcohol, polyacrylamide and water into a stirrer for mixing and stirring to obtain a cementing material slurry, wherein the cement is P.II 42.5R-grade silicate cement; the fly ash is I-grade fly ash or II-grade fly ash; the fineness of the calcium hydroxide is 200 meshes; the polymerization degree of the polyvinyl alcohol is 1700; the molecular weight of the polyacrylamide is 2000 ten thousand;
(4) Adding nano stable foam into the gel material slurry body, stirring to obtain foam solid carbon gel material slurry body, pouring into a mould, solidifying, and curing for 1 day at normal temperature; carbonizing and curing after demolding, wherein the carbonizing and curing temperature is 20 ℃, the humidity is 95%, and the carbon dioxide concentration is 60%; and carrying out standard curing, wherein the temperature is 15 ℃, the humidity is 50%, and the curing time is 26 days, so as to obtain the ecological porous carbon-fixing concrete based on carbon capture and carbon sealing.
Example 2
An ecological porous carbon-fixing concrete based on carbon capture and carbon sequestration comprises the following components in parts by mass: 60 parts of silicate cement; 8 parts of silica fume; 6 parts of fly ash; 55 parts of calcium hydroxide; 3 parts of polyvinyl alcohol; 0.3 parts of polyacrylamide; 1 part of nano reinforced foaming agent and 45 parts of water;
the nano modified foaming agent comprises the following components in mass: 4 parts of nano silicon dioxide, 2 parts of nano titanium dioxide, 6 parts of surfactant, 6 parts of dispersing agent, 1 part of stabilizer and 85 parts of water.
The preparation method of the ecological porous carbon-fixing concrete comprises the following steps:
(1) Adding nano silicon dioxide and nano titanium dioxide into water for stirring and ultrasonic dispersion treatment, wherein the ultrasonic dispersion time is 25 minutes, the stirring time is 20 minutes, the stirring temperature is 55 ℃, then adding a dispersing agent for continuous stirring, after the aggregate in the suspension is completely dispersed, adding a surfactant and a stabilizing agent for continuous stirring to prepare a nano modified foaming agent, wherein the nano silicon dioxide is hydrophobic, the surfactant is lauramidopropyl betaine, the stabilizing agent is hydroxypropyl methyl cellulose, and the dispersing agent is polyethylene glycol 2000;
(2) Diluting the nano modified foaming agent with water for 20 times, and using an air compressor to compress and foam, wherein the foaming pressure of the air compressor is 0.45Mpa, so as to obtain nano stable foam;
(3) Adding cement, silica fume, fly ash, calcium hydroxide, polyvinyl alcohol, polyacrylamide and water into a stirrer for mixing and stirring to obtain a cementing material slurry, wherein the cement is P.II42.5R-grade silicate cement; the fly ash is class II fly ash; the fineness of the calcium hydroxide is 300 meshes; the polymerization degree of the polyvinyl alcohol is 1700; the molecular weight of the polyacrylamide is 2500 ten thousand;
(4) Adding nano stable foam into the gel material slurry body, stirring to obtain foam solid carbon gel material slurry body, pouring into a mould, solidifying, and curing for 1 day at normal temperature; carbonizing and curing after demolding, wherein the carbonizing and curing temperature is 25 ℃, the humidity is 99%, and the carbon dioxide concentration is 80%; and carrying out standard curing, wherein the temperature is 20 ℃, the humidity is 90%, and the curing time is 20 days, so as to obtain the ecological porous carbon-fixing concrete based on carbon capture and carbon sealing.
Comparative example 1
Compared with the example 1, the carbon-fixed concrete has the following components by mass: 50 parts of silicate cement; 5 parts of silica fume; 5 parts of fly ash; 40 parts of calcium hydroxide; 2 parts of polyvinyl alcohol; 0.6 part of nano modified foaming agent and 50 parts of water;
the nano modified foaming agent comprises the following components in mass: 4 parts of nano silicon dioxide, 2 parts of nano titanium dioxide, 6 parts of surfactant, 6 parts of dispersing agent, 1 part of stabilizer and 85 parts of water.
The preparation method of the carbon-fixing concrete comprises the following steps:
(1) Adding nano silicon dioxide and nano titanium dioxide into water for stirring and ultrasonic dispersion treatment, wherein the ultrasonic dispersion time is 20 minutes, the stirring time is 25 minutes, the stirring temperature is 50 ℃, then adding a dispersing agent for continuous stirring, after the aggregate in the suspension is completely dispersed, adding a surfactant and a stabilizing agent for continuous stirring, thus obtaining a nano modified foaming agent, wherein the nano silicon dioxide is hydrophobic, the surfactant is cocamidopropyl betaine, the stabilizing agent is hydroxypropyl methyl cellulose, and the dispersing agent is polyethylene glycol 2000;
(2) Diluting the nano modified foaming agent by 15 times with water, and using an air compressor for compression foaming, wherein the foaming pressure of the air compressor is 0.35Mpa, so as to obtain nano stable foam;
(3) Adding cement, silica fume, fly ash, calcium hydroxide, polyvinyl alcohol and water into a stirrer for mixing and stirring to obtain a cementing material slurry, wherein the cement is P.II 42.5R-grade silicate cement; the fly ash is I-grade fly ash or II-grade fly ash; the fineness of the calcium hydroxide is 200 meshes; the polymerization degree of the polyvinyl alcohol is 1700;
(4) Adding nano stable foam into the gel material slurry body, stirring to obtain foam solid carbon gel material slurry body, pouring into a mould, solidifying, and curing for 1 day at normal temperature; carbonizing and curing after demolding, wherein the carbonizing and curing temperature is 20 ℃, the humidity is 95%, and the carbon dioxide concentration is 60%; and carrying out standard curing, wherein the temperature is 15 ℃, the humidity is 50%, and the curing time is 26 days, so as to obtain the carbon-fixed concrete.
Comparative example 2
Compared with the embodiment 1, the carbon-fixed concrete removes polyvinyl alcohol and comprises the following components in parts by mass: 50 parts of silicate cement; 5 parts of silica fume; 5 parts of fly ash; 40 parts of calcium hydroxide; 0.2 parts of polyacrylamide; 0.6 part of nano modified foaming agent and 50 parts of water;
the nano modified foaming agent comprises the following components in mass: 4 parts of nano silicon dioxide, 2 parts of nano titanium dioxide, 6 parts of surfactant, 6 parts of dispersing agent, 1 part of stabilizer and 85 parts of water.
The preparation method of the carbon-fixing concrete comprises the following steps:
(1) Adding nano silicon dioxide and nano titanium dioxide into water for stirring and ultrasonic dispersion treatment, wherein the ultrasonic dispersion time is 20 minutes, the stirring time is 25 minutes, the stirring temperature is 50 ℃, then adding a dispersing agent for continuous stirring, after the aggregate in the suspension is completely dispersed, adding a surfactant and a stabilizing agent for continuous stirring, thus obtaining a nano modified foaming agent, wherein the nano silicon dioxide is hydrophobic, the surfactant is cocamidopropyl betaine, the stabilizing agent is hydroxypropyl methyl cellulose, and the dispersing agent is polyethylene glycol 2000;
(2) Diluting the nano modified foaming agent by 15 times with water, and using an air compressor for compression foaming, wherein the foaming pressure of the air compressor is 0.35Mpa, so as to obtain nano stable foam;
(3) Adding cement, silica fume, fly ash, calcium hydroxide, polyacrylamide and water into a stirrer for mixing and stirring to obtain a cementing material slurry, wherein the cement is P.II 42.5R-grade silicate cement; the fly ash is I-grade fly ash or II-grade fly ash; the fineness of the calcium hydroxide is 200 meshes; the molecular weight of the polyacrylamide is 2000 ten thousand;
(4) Adding nano stable foam into the gel material slurry body, stirring to obtain foam solid carbon gel material slurry body, pouring into a mould, solidifying, and curing for 1 day at normal temperature; carbonizing and curing after demolding, wherein the carbonizing and curing temperature is 20 ℃, the humidity is 95%, and the carbon dioxide concentration is 60%; and carrying out standard curing, wherein the temperature is 15 ℃, the humidity is 50%, and the curing time is 26 days, so as to obtain the carbon-fixed concrete.
According to JC/T2357-2016, the compression resistance, the fracture resistance and the carbon fixation performance of the examples and the comparative examples are tested, and the obtained results show that the ecological porous carbon fixation concrete prepared in the example 1 has the compression strength of 7.2Mpa, the fracture strength of 2.1Mpa and the carbon fixation rate of 17% in 12 hours; the ecological porous carbon-fixing concrete prepared in the example 2 has the compressive strength of 8.3Mpa, the flexural strength of 2.4Mpa and the carbon-fixing rate of 20% in 12 hours. The compression strength of the carbon-fixing concrete prepared in the comparative example 1 is 3.5Mpa, the flexural strength is 1.1Mpa, and the carbon-fixing rate is 9% after 12 hours; the compression strength of the carbon-fixing concrete prepared in comparative example 2 is 2.7Mpa, the flexural strength is 0.8Mpa, and the carbon-fixing rate is 11% in 12 hours.
Claims (10)
1. The ecological porous carbon-fixing concrete based on carbon capture and carbon sealing is characterized by comprising 40-70 parts of cement, 0-10 parts of silica fume, 0-10 parts of fly ash, 10-60 parts of calcium hydroxide, 1-5 parts of polyvinyl alcohol, 0.1-0.5 part of polyacrylamide, 0.5-2 parts of nano modified foaming agent and 20-50 parts of water.
2. The carbon-fixed concrete according to claim 1, wherein the nano modified foaming agent comprises 4-6 parts of nano silicon dioxide, 1-3 parts of nano titanium dioxide, 5-8 parts of surfactant, 5-8 parts of dispersing agent, 1-2 parts of stabilizer and 80-90 parts of water.
3. A method of preparing the carbon-stabilized concrete of claim 1, comprising the steps of:
(1) Adding nano silicon dioxide and nano titanium dioxide into water for stirring and ultrasonic dispersion treatment, adding a dispersing agent for continuous stirring, and adding a surfactant and a stabilizing agent for continuous stirring after the aggregate in the suspension is completely dispersed to prepare a nano modified foaming agent;
(2) Taking a nano modified foaming agent, diluting, and then compressing and foaming to obtain nano stable foam;
(3) Adding cement, silica fume, fly ash, calcium hydroxide, polyvinyl alcohol, polyacrylamide and water into a stirrer for mixing and stirring to obtain a cementing material slurry;
(4) Adding the nano stable foam into the gel material slurry body, stirring to obtain a foam carbon-fixing gel material slurry body, pouring, solidifying, demoulding, carbonizing and curing, and performing standard curing to obtain the ecological porous carbon-fixing concrete based on carbon capture and carbon sealing.
4. The method according to claim 3, wherein in the step (1), the ultrasonic dispersion time is 20 to 30 minutes, the stirring time is 20 to 40 minutes, and the stirring temperature is 50 to 55 ℃.
5. The method according to claim 3, wherein in the step (1), the nano silica is hydrophobic, the surfactant is cocamidopropyl betaine or lauramidopropyl betaine, the stabilizer is hydroxypropyl methylcellulose, and the dispersant is polyethylene glycol 2000.
6. The method according to claim 3, wherein in the step (2), the nano-modified foaming agent is diluted 15 to 20 times with water.
7. The method according to claim 3, wherein in the step (2), the compressed air is foamed and the air compressor is foamed at a pressure of 0.35 to 0.45Mpa.
8. A method of preparing according to claim 3, wherein in step (3), the cement is a p.ii42.5R grade portland cement; the fly ash is I-grade fly ash or II-grade fly ash; the fineness of the calcium hydroxide is 100-300 meshes; the polymerization degree of the polyvinyl alcohol is 1700; the molecular weight of the polyacrylamide is 2000-2500 ten thousand.
9. The method according to claim 3, wherein in the step (4), the carbonization and maintenance are performed for 12 to 24 hours at 15 to 25 ℃, the humidity is 95 to 99%, and the carbon dioxide concentration is 50 to 80%.
10. The method according to claim 3, wherein in the step (4), the standard curing is performed for 15 to 30 days at 15 to 25 ℃ and a humidity of 50 to 99%.
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