CN116968175A - Mixing method for improving carbon fixation effect of cement-based material - Google Patents
Mixing method for improving carbon fixation effect of cement-based material Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 63
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 239000004568 cement Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000002156 mixing Methods 0.000 title claims abstract description 44
- 239000000463 material Substances 0.000 title claims abstract description 37
- 230000000694 effects Effects 0.000 title claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 150000001412 amines Chemical class 0.000 claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 20
- 239000002351 wastewater Substances 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000005273 aeration Methods 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 230000009919 sequestration Effects 0.000 claims description 15
- 230000036571 hydration Effects 0.000 claims description 6
- 238000006703 hydration reaction Methods 0.000 claims description 6
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 239000004566 building material Substances 0.000 abstract description 5
- 229940124532 absorption promoter Drugs 0.000 abstract description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 58
- 229910002092 carbon dioxide Inorganic materials 0.000 description 29
- 239000001569 carbon dioxide Substances 0.000 description 29
- 238000012360 testing method Methods 0.000 description 20
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 description 12
- 239000004567 concrete Substances 0.000 description 8
- 238000007789 sealing Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 description 6
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 4
- 239000002105 nanoparticle Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- WGQKYBSKWIADBV-UHFFFAOYSA-N benzylamine Chemical compound NCC1=CC=CC=C1 WGQKYBSKWIADBV-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 description 1
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 1
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
- BFSVOASYOCHEOV-UHFFFAOYSA-N 2-diethylaminoethanol Chemical compound CCN(CC)CCO BFSVOASYOCHEOV-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- LVTYICIALWPMFW-UHFFFAOYSA-N diisopropanolamine Chemical compound CC(O)CNCC(C)O LVTYICIALWPMFW-UHFFFAOYSA-N 0.000 description 1
- 229940043276 diisopropanolamine Drugs 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B28C5/003—Methods for mixing
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of cement-based building materials, in particular to a mixing method for improving the carbon fixation effect of a cement-based material. The invention adopts cement-based product production alkaline wastewater as mixing water, prehydrates slurry in the stirring process, and then circulates and fixes carbon according to the process of aeration stirring carbon fixation, gas stopping static stop, aeration stirring carbon fixation and gas stopping static stop, so that the high-efficiency carbon fixation in the cement-based material mixing process at normal temperature and normal pressure can be realized, and a certain amount of organic amine is added as CO 2 Absorption promoter capable of assisting in increasing CO 2 Absorption effect.
Description
Technical Field
The invention relates to the technical field of cement-based building materials, in particular to a mixing method for improving the carbon fixation effect of a cement-based material.
Background
With the development of human activities and industry, greenhouse gases mainly containing carbon dioxide accumulate year by year, and carbon dioxide emission has become a serious concern for governments of various countries.
It is estimated that 5% of the annual carbon dioxide emissions worldwide can be attributed to cement production.
Cement-based materials have been the most widely used building materials, and the industry of "carbon reduction and carbon reduction" is urgent.
Carbon capture, utilization and sequestration technology (CCUS) is one of the most viable technological approaches for achieving maximum carbon dioxide emission reduction in the cement concrete industry.
According to research, cement hydration can form an alkaline environment with high carbonization reaction activity, considerable carbon dioxide can be stored, no chemical pretreatment, high temperature or high pressure are needed, and economic feasibility is high.
Many scholars have demonstrated that carbon dioxide absorption with cement-based materials can effectively reduce the carbon footprint. CO in cement-based materials 2 Sequestration can be considered as the least burdened and most realistic CO 2 Sealing alternatives.
Patent CN113816767a discloses a method for preparing a carbon dioxide ready-mixed cement-based composite material, which pumps carbon dioxide during the ready-mixing of cement-based materials to realize the sealing of carbon dioxide, and has only 0.3% of carbon fixation under the condition of no loss of strength.
Patent CN113650160A discloses a method and a device for preparing concrete building materials by adding carbon dioxide during stirring, and provides a device for adding carbon dioxide during stirring, but the preparation method is complex in process, the treatment time by introducing carbon dioxide is 25-35min, the treatment time is too long, and the process needs to be pressurized.
The Shuang Luo adopts 15 percent of fly ash and less than 0.3 percent of CO 2 The mixing proportion of the mixing amount produces the environment-friendly solid CO with good workability 2 Building materials, but with CO 2 The mixing amount is improved, and the compressive strength is obviously reduced.
Sean Monkman believes that the best CO enhances intensity 2 The dosage is lower than 0.30%, the early strength can be improved by 10-14%, and the strength is reduced by more than 0.3%.
The inventor searches and actually surveys through a large number of prior art, and the cement-based material is stirredIn-process CO 2 The absorption of carbon dioxide under normal pressure is not up to an ideal level at present, the carbon dioxide sealing quantity under normal pressure is only 1.5 percent of the cement quality at most, the loss of strength is great, and an effective process for improving the sealing quantity of carbon dioxide under normal pressure and keeping the enhancement of the mechanical property of cement-based materials is lacking in the prior art at present.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a mixing method for improving the carbon fixation effect of cement-based materials, which comprises the steps of adopting alkaline wastewater produced by cement-based products as mixing water, pre-hydrating slurry in the mixing process, and circularly fixing carbon according to the process of aeration stirring carbon fixation, air stopping static stop, aeration stirring carbon fixation and air stopping static stop, so that the high-efficiency carbon fixation in the mixing process of cement-based materials at normal temperature and normal pressure can be realized, and a certain amount of organic amine is added as CO 2 Absorption promoter capable of assisting in increasing CO 2 Absorption effect.
Specifically, the mixing method for improving the carbon fixation effect of the cement-based material comprises the following steps:
1) Mixing organic amine with mixing water according to the mass ratio to prepare organic amine solution, wherein the mixing water is alkaline wastewater generated in cement-based product production,
2) Stirring the cementing material and the organic amine solution according to the mass ratio to obtain slurry,
3) Prehydrating the slurry and introducing ordinary-pressure CO 2 And (3) carrying out aeration and stirring carbon fixation-gas stopping static stopping process circulation carbon fixation.
The carbon dioxide sealing and storing process is to react the carbon dioxide in cement-based material with the matter capable of reacting with carbon dioxide in water medium.
Preferably, the invention is an atmospheric CO 2 Can be CO stored under normal pressure 2 Or from high pressure CO 2 Is prepared by regulating the pressure to normal pressure through a pressure reducing valve.
Preferably, the alkaline wastewater produced in the cement-based product production in the step 1) is at least one of maintenance wastewater and cleaning wastewater.
The research of the invention shows that the alkaline wastewater produced by adopting the cement-based product contains a large amount of Ca 2+ 、OH － 、Mg 2+ The alkaline ion can be used for promoting the sealing and storage of carbon dioxide.
Preferably, the organic amine in the step 1) is at least one of monoethanolamine, diethanolamine, triethanolamine, diisopropanolamine, diethylaminoethanol and N-methyldiethanolamine, triethylenetetramine, piperazine, benzylamine and diethanol monoisopropanolamine.
More preferably, the organic amine comprises at least one of N-methyldiethanolamine, diethanolamine, piperazine.
More preferably, the organic amine is a mixture of N-methyldiethanolamine, diethanolamine, piperazine.
The mixing method of the invention has the advantages that carbon dioxide participates in the hydration of cement to form nano-sized calcium carbonate, and the micro-sized calcium carbonate can promote the absorption of organic amine to carbon dioxide, and in particular, the invention discovers that N-methyldiethanolamine can promote CO 2 Is hydrolyzed to form HCO 3 - Diethanolamine to CO 2 The absorption of the nano particles is strongest, and the combination of the nano particles and the piperazine can improve the activation effect of the nano particles, so that the absorption of the cement paste on carbon dioxide can be effectively promoted.
Preferably, the cementing material of step 2) is cement.
The cement may be Portland cement, pozzolanic Portland cement, high alumina cement, sulphoaluminate cement, etc.
Preferably, the slurry water-gel ratio in the step 2) is 0.2-0.5, and the addition amount of the organic amine is 0.1-0.3% of the mass of the cementing material.
Preferably, the prehydration time of step 3) is 1-60min.
According to the invention, the cement-based material seals carbon dioxide and mainly reacts with clinker minerals and hydration products, and after a period of pre-hydration time is set, the minerals in the clinker are fully dissolved, and meanwhile, partial hydration products are generated, so that the reaction quantity of the carbon dioxide can be increased.
Preferably, the aeration, stirring and carbon fixation time in the step 3) is 10-20min.
Preferably, the dead time of the gas stopping in the step 3) is 10-20min.
Preferably, the number of carbon fixation cycles in step 3) is 1-5.
Preferably, the total time of the cyclic carbon fixation in the step 3) is 20-120min.
Preferably, the cyclic carbon sequestration temperature in step 3) is 5-30 ℃.
The research of the invention finds that the temperature is also an important ring for influencing the absorption of carbon dioxide, the reaction rate is slowed down when the temperature is too low, and the dissolution of the carbon dioxide is influenced when the temperature is too high.
The invention also relates to application of the cement-based material mixing method in improving the carbon fixation effect.
The invention uses the premixed cement-based material to seal carbon dioxide under normal pressure, has low equipment requirement and short carbon dioxide intervention time, is easy to realize, can effectively improve the sealing quantity of carbon dioxide, can reach more than 4% of cement mass under the optimal condition, relieves the greenhouse effect, realizes carbon emission reduction in the cement industry, has very small influence on the pH value in the cement-based material, does not cause the reduction of the mechanical property of the cement-based material, simultaneously treats the waste water generated in the use process of the cementing material, and accords with the low-carbon green development of the cement industry.
Detailed Description
In order to characterize the technical effect of the invention, the cement paste is mixed and carbon fixation is carried out by adopting the mixing method, and the formed cement paste test piece is subjected to carbon fixation amount and compressive strength test.
Example 1
The mixing method comprises the following steps: 1) mixing 1.1 parts of triethanolamine with 220 parts of concrete curing wastewater according to the mass ratio to prepare an organic amine solution, 2) stirring 550 parts of P.O 42.5 cement and the organic amine solution according to the mass ratio to obtain a slurry, 3) prehydrating the slurry for 30min, and then introducing normal-pressure CO at 20 DEG C 2 Aerating and stirring to fix carbon for 20min, stopping the aeration and the static stopping for 10min, and aerating and stirring to fix carbonAnd (3) carrying out process circulation carbon fixation for 20 min-stopping gas and standing for 10 min.
Through detection, the carbon fixation amount of the test piece is 2.69%, the compressive strength of the test piece 3d is 22.3MPa, the compressive strength of the test piece 7d is 32.2MPa, and the compressive strength of the test piece 28d is 50.3MPa.
Example 2
The mixing method comprises the following steps: 1) mixing 0.3 part of N-methyldiethanolamine, 0.4 part of diethanolamine, 0.4 part of piperazine and 220 parts of concrete curing wastewater according to mass ratio to prepare an organic amine solution, 2) stirring 550 parts of P.O 42.5 cement and the organic amine solution according to mass ratio to obtain slurry, 3) prehydrating the slurry for 30min and introducing normal pressure CO at 20 DEG C 2 And (3) carrying out aeration and stirring for carbon fixation for 20min, stopping air and stopping for 10min, and carrying out process circulation for carbon fixation.
Through detection, the carbon fixation amount of the test piece is 3.21%, the compressive strength of the test piece 3d is 22.1MPa, the compressive strength of the test piece 7d is 33.5MPa, and the compressive strength of the test piece 28d is 51.2MPa.
Example 3
The mixing method comprises the following steps: 1) mixing 0.3 part of N-methyldiethanolamine, 0.5 part of diethanolamine, 0.5 part of piperazine and 220 parts of concrete curing wastewater according to mass ratio to prepare an organic amine solution, 2) stirring 550 parts of P.O 42.5 cement and the organic amine solution according to mass ratio to obtain slurry, 3) prehydrating the slurry for 40min and introducing normal pressure CO at 20 DEG C 2 And (3) carrying out process circulation carbon fixation by carrying out aeration and stirring carbon fixation for 20min, stopping air and stopping air for 20min, aeration and stirring carbon fixation for 20min and stopping air for 20min.
Through detection, the carbon fixation amount of the test piece is 4.20%, the 3d compressive strength of the test piece is 20.3MPa, the 7d compressive strength is 32.2MPa, and the 28d compressive strength is 49.6MPa.
Comparative example 1
The mixing method comprises the following steps: 1) 550 parts of P.O 42.5 cement and concrete curing wastewater are stirred according to the mass ratio to obtain slurry, 2) the slurry is introduced into atmospheric CO at 20 DEG C 2 Aeration stirring is carried out to fix carbon for 120min.
Through detection, the carbon fixation amount of the test piece is 0.41%, the compressive strength of the test piece 3d is 14.2MPa, the compressive strength of the test piece 7d is 22.7MPa, and the compressive strength of the test piece 28d is 43.7MPa.
Comparative example 2
The mixing method comprises the following steps: 1) mixing 1.1 parts of triethanolamine with 220 parts of concrete curing wastewater according to the mass ratio to prepare an organic amine solution, 2) stirring 550 parts of P.O42.5 cement with the organic amine solution according to the mass ratio to obtain a slurry, 3) introducing the slurry into normal pressure CO at 20 DEG C 2 And (3) carrying out aeration and stirring for carbon fixation for 20min, stopping air and stopping for 10min, and carrying out process circulation for carbon fixation.
Through detection, the carbon fixation amount of the test piece is 1.87%, the 3d compressive strength of the test piece is 21.5MPa, the 7d compressive strength is 28.3MPa, and the 28d compressive strength is 43.6MPa.
Comparative example 3
The mixing method comprises the following steps: 1) mixing 1.1 parts of triethanolamine with 220 parts of concrete curing wastewater according to the mass ratio to prepare an organic amine solution, 2) stirring 550 parts of P.O 42.5 cement and the organic amine solution according to the mass ratio to obtain a slurry, 3) prehydrating the slurry for 30min, and then introducing normal-pressure CO at 20 DEG C 2 Aeration stirring is carried out to fix carbon for 60min.
Through detection, the carbon fixation amount of the test piece is 1.62%, the 3d compressive strength of the test piece is 21.1MPa, the 7d compressive strength is 29.2MPa, and the 28d compressive strength is 45.6MPa.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The mixing method for improving the carbon fixation effect of the cement-based material is characterized by comprising the following steps of:
1) Mixing organic amine with mixing water according to the mass ratio to prepare organic amine solution, wherein the mixing water is alkaline wastewater generated in cement-based product production,
2) Stirring the cementing material and the organic amine solution according to the mass ratio to obtain slurry,
3) Prehydrating the slurry and introducing ordinary-pressure CO 2 And (3) carrying out aeration and stirring carbon fixation-gas stopping static stopping process circulation carbon fixation.
2. The mixing method for improving the carbon sequestration effect of cement-based materials according to claim 1, wherein the alkaline waste water produced in the cement-based product production in step 1) is at least one of curing waste water and cleaning waste water.
3. The method of mixing for improving the carbon sequestration efficiency of cementitious materials of claim 1 wherein step 2) the cementitious material is cement.
4. The mixing method for improving the carbon fixation effect of the cement-based material according to claim 1, wherein the slurry water-cement ratio in the step 2) is 0.2-0.5, and the addition amount of the organic amine is 0.1-0.3% of the mass of the cementing material.
5. The method of mixing for improving the carbon sequestration efficiency of cementitious materials of claim 1, wherein the pre-hydration time of step 3) is 1-60 minutes.
6. The mixing method for improving the carbon sequestration effect of cement-based materials according to claim 1, wherein the aeration-agitation carbon sequestration time in step 3) is 10-20min.
7. The mixing method for improving the carbon sequestration effect of cement-based materials according to claim 1, wherein the dead time of the gas cut-off in the step 3) is 10-20min.
8. The method for improving the carbon sequestration effect of cement-based materials according to claim 1, wherein the number of carbon sequestration cycles in step 3) is 1-5.
9. The mixing method for improving the carbon sequestration effect of cement-based materials according to claim 1, wherein the total time of the cyclic carbon sequestration in step 3) is 20-120min.
10. The method of mixing for improving the carbon sequestration effect of cementitious materials of claim 1 wherein step 3) the cyclic carbon sequestration temperature is 5-30 ℃.
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| CN115818997A (en) * | 2022-11-11 | 2023-03-21 | 宁波建工工程集团有限公司 | Organic amine-based rapid carbonization method for construction waste recycled aggregate |
| CN116283142A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Commercial mixing station carbon fixation ready-mixed concrete and preparation method thereof |
| CN116396018A (en) * | 2023-03-03 | 2023-07-07 | 湖北工业大学 | Method for preparing nano-micron crystal nucleus additive by utilizing commercial mixing station waste slurry and wastewater integrated carbon fixation |
| CN116715497A (en) * | 2023-05-19 | 2023-09-08 | 江苏博拓新型建筑材料股份有限公司 | Carbon-fixing aerated concrete wall material product based on nickel slag and concrete tail slurry and preparation method thereof |
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