CN115304314A - Carbon dioxide driven hardened ultra-high performance concrete and preparation method thereof - Google Patents
Carbon dioxide driven hardened ultra-high performance concrete and preparation method thereof Download PDFInfo
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 48
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 22
- -1 alcohol amine Chemical class 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002904 solvent Substances 0.000 claims abstract description 13
- 239000011575 calcium Substances 0.000 claims abstract description 12
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 9
- 239000002893 slag Substances 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 26
- 239000007864 aqueous solution Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 4
- ARHMMDOXGIIARL-UHFFFAOYSA-N calcium;dihydroxy(dioxido)silane Chemical compound [Ca+2].O[Si](O)([O-])[O-] ARHMMDOXGIIARL-UHFFFAOYSA-N 0.000 claims description 4
- FZVXUPLDQNBUQZ-UHFFFAOYSA-N [Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-] Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-] FZVXUPLDQNBUQZ-UHFFFAOYSA-N 0.000 claims description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 3
- LMFJSZLUHBLNTC-UHFFFAOYSA-N dicalcium;magnesium;trioxido(trioxidosilyloxy)silane Chemical compound [Mg+2].[Ca+2].[Ca+2].[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-] LMFJSZLUHBLNTC-UHFFFAOYSA-N 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 229940058020 2-amino-2-methyl-1-propanol Drugs 0.000 claims description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 2
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 claims description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 2
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000000748 compression moulding Methods 0.000 claims 1
- 239000011738 major mineral Substances 0.000 claims 1
- 235000011963 major mineral Nutrition 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 239000004568 cement Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 101000912181 Arabidopsis thaliana Cysteine synthase, mitochondrial Proteins 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 230000035425 carbon utilization Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a carbon dioxide driven hardened ultra-high performance concrete, which comprises, by weight, 60-80% of low-calcium negative carbon clinker, 0-30% of steel slag powder, 0-20% of silica fume, 10-20% of CO 2 A pre-solvent solution and 0.5-5% of water reducing agent. The invention also provides a preparation method of the ultra-high performance concrete. The invention uses alcohol amine solution to absorb CO in industrial tail gas in advance 2 Introducing CO in the gas phase 2 And converting the alcohol into an alcohol amine solution to be used as a mixing water solution. After the mixing is finished, clinker and CO in the concrete 2 The reaction of (2) is started to avoid CO 2 The strength cannot be increased due to the failure to diffuse into the inside. Meanwhile, the morphology of the product calcium carbonate is modified by the alcohol amine molecules, so that the product calcium carbonate grows into a fibrous shape from a cubic morphology, the product calcium carbonate replaces the fiber of the traditional ultrahigh-performance concrete, and CO is increased 2 Fracture resistance of drive-hardened ultra-high performance concreteAnd (4) strength.
Description
Technical Field
The invention belongs to the technical field of ecological building materials, and particularly relates to carbon dioxide driven hardened ultra-high performance concrete and a preparation method thereof.
Background
Ultra-high performance concrete (UHPC) is the most innovative cement-based engineering material developed in the last thirty years, one of the greatest advantages of the ultra-high performance concrete is that the ultra-high performance concrete has excellent durability and ultra-high mechanical properties, and the research of the UHPC at home and abroad at present is mainly applied to bridge engineering, building exterior wall decoration engineering and the like. Ultra-high performance concrete has grown to mature over 20 years.
The cementing material of the ultra-high performance concrete in the current research and application is ordinary portland cement supplemented with ultra-fine filler and a large amount of functional additives. Emission of large amount of CO in cement production process 2 And an important burden is caused to the environment. In recent years, the research field of cementing materials develops a novel low-calcium negative carbon clinker and CO 2 Calcium carbonate and silica gel are generated by reaction. Through short-time carbonization and curing, excellent mechanical properties can be formed.
If the novel low-calcium negative carbon clinker is used as a cementing material to prepare the ultra-high performance concrete, the carbon emission of the ultra-high performance concrete is obviously reduced, the ultra-high mechanical and durable performances can be obtained, and the method has obvious economic benefits and social values. Carbon-negative clinker strength development-free CO 2 The common reaction process is that gas-phase CO2 diffuses from outside to inside, and clinker and gas-phase CO react 2 The reaction produces a product to produce strength. The intercommunicating pores on the surface and inside of the concrete are gas phase CO 2 An inwardly diffusing channel. Therefore, the key problems of preparing the ultra-high performance concrete by using the novel low-calcium negative carbon clinker as the cementing material comprise:
(1) In order to obtain ultra-high mechanical properties, the porosity of UHPC is very low, only about 5%, which is 1/4 of that of ordinary concrete. Very low porosity results in gas phase CO 2 The inward diffusion is difficult, and the clinker can not complete the reaction, so that the strength is difficult to improve.
(2) Ultra High Performance Concrete (UHPC) requires excellent fracture resistance, and steel fiber and the like are often added to existing solutions. Under the pressure forming condition, the pavement and the arrangement of the steel fibers are difficult to implement, so that the fibers cannot be uniformly and directionally arranged, and the flexural strength of the ultrahigh-performance concrete is reduced.
Therefore, the development of a material and a preparation method for preparing the ultra-high performance concrete by using the novel low-calcium negative carbon clinker as the cementing material is urgently needed, and the problem of CO is solved 2 The compressive strength and the rupture strength of the UHPC are improved under driving.
Disclosure of Invention
Aiming at the problems, the carbon dioxide driven hardening ultrahigh-performance concrete and the preparation method thereof are provided. The existing carbon dioxide is absorbed while the emission of the carbon dioxide is reduced, and the carbon utilization is realized.
The technical content of the invention is as follows:
the carbon dioxide driven hardened ultrahigh-performance concrete comprises, by weight, 60-80% of low-calcium negative carbon clinker, 0-30% of steel slag powder, 0-20% of silica fume and 10-20% of CO 2 A pre-solvent solution and 0.5-5% of water reducing agent.
Preferably, the preparation method of the pre-solvent solution comprises the following steps: will contain CO 2 The industrial tail gas passes through a pipeline provided with a spraying or misting alcohol amine water solution, so that the alcohol amine water solution absorbs CO in the tail gas 2 Introducing CO in the gas phase 2 Transition to a stable liquid state.
Preferably, the alcohol amine aqueous solution is one or a mixture of more than two of triethanolamine aqueous solution, N-methyldiethanolamine aqueous solution, diethanolamine aqueous solution, 2-amino-2-methyl-1-propanol aqueous solution and ethanolamine aqueous solution, and the mass concentration of the alcohol amine in the alcohol amine aqueous solution is 10-80%.
Preferably, the main mineral phase of the low-calcium negative carbon clinker is gamma-dicalcium silicate (gamma-C) 2 S), tricalcium disilicate (C) 3 S 2 ) Monocalcium silicate (CS) and dicalcium magnesium disilicate (C) 2 MS 2 ) (ii) a The sum of the four clinker phases in the clinker is more than 70 percent by weight.
Preferably, the filler comprises steel slag powder and silica fume, and the specific surface areas of the ultrafine steel slag powder and the ultrafine silica fume are both larger than 600m 2 /kg。
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
Preferably, the inside of the ultra-high performance concrete includes micron-sized calcium carbonate fibers having a fiber diameter of about 2 to 10 microns, a fiber length of about 5 to 200 microns, and a ratio of length to diameter of about 5 to 20.
The preparation method of the ultra-high performance concrete comprises the step of mixing CO 2 And (3) uniformly mixing the pre-solvent solution and other dry powder raw materials, pressing and forming, and then carrying out pressure curing.
Preferably, the press molding is performed under a pressure of 10 to 100 MPa.
Preferably, the curing temperature of the pressure curing is 20-60 ℃, and the curing humidity is 50-80%.
Preferably, CO is carbonized and cured 2 Volume concentration range of 15-99.9%, CO 2 The curing pressure is 0-0.5MPa.
The principle and technical advantages of the ultra-high performance concrete are as follows:
(1) Pre-absorbing CO in industrial tail gas by alcohol amine solution 2 Introducing CO in the gas phase 2 And converting the alcohol into an alcohol amine solution to be used as a mixing water solution. After the mixing is finished, clinker and CO in the concrete 2 The reaction of (2) is started to avoid CO 2 The strength cannot be improved due to the failure to diffuse inside.
(2) The alcohol amine molecules modify the morphology of the product calcium carbonate so that the product calcium carbonate grows from a cubic morphology to a fibrous shape having a fiber diameter of about 2 to 10 microns, a fiber length of about 5 to 200 microns, and a ratio of length to diameter of about 5 to 20. Make CO 2 The inside of the ultra-high performance concrete driven to be hardened is filled with micron-sized fibrous calcium carbonate to replace the fiber of the traditional ultra-high performance concrete and improve CO 2 The flexural strength of the hardened ultra-high performance concrete is driven.
(3) The ultra-high performance concrete can absorb CO 2 The carbon fixation amount is about 0.15g/g concrete, and the CO of the ultra-high performance concrete is obviously reduced 2 And (4) discharging, and having a remarkable carbon reduction value.
Drawings
FIG. 1 is a topographical view of the product of example 1.
FIG. 2 is a product morphology map of comparative example 1.
FIG. 3 is a product morphology map of comparative example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Tables 1 and 2 show the chemical composition and the phase composition, respectively, of the low-calcium negative carbon clinker used in the following examples. Among them, monocalcium silicate, tricalcium disilicate and dicalcium magnesium disilicate are carbon reactive phases.
TABLE 1 chemical composition of low-calcium negative carbon clinker (%)
| CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | MgO | Others | |
| Carbon-negative clinker | 44.03 | 32.23 | 7.19 | 6.13 | 5.01 | 5.41 |
TABLE 2 composition of the phases of the low-calcium negative carbon clinker (%)
| CS | C 3 S 2 | C 2 AS | C 2 MS 2 | Glass phase | |
| Carbon-negative clinker | 32.3 | 34.6 | 11.7 | 12.9 | 8.5 |
The specific parameters of the steel slag and the silica fume used in the following examples are as follows:
SiO of silica fume 2 The content is more than 95 percent, and the main phase is amorphous SiO 2 A specific surface area of about 2000m 2 /kg。
The main phases of the superfine steel slag powder are dicalcium silicate, dicalcium ferrite, tetracalcium aluminoferrite and glass phases, and the mass percentage of the four phases is about 80 percent. Specific surface area of about 780m 2 /kg。
Table 3 shows the raw material composition and the mixture ratio of the carbon dioxide driven hardened ultra-high performance concrete of examples 1 to 6.
TABLE 3 UHPC blend ratio (g)
The raw material contents in examples 1 to 3 were the same, except that the composition of the pre-solvent solution in each example was different, see table 4. To pre-dissolve CO 2 Later, the mass increase of the pre-solvent solution reflects the CO 2 Pre-dissolving amount.
TABLE 4 (unit: g)
The invention also provides a preparation method of the ultra-high performance concrete, which is to mix CO 2 The pre-solvent solution is evenly mixed with other dry powder raw materials and then is pressed and formed under the pressure of 50 MPa. After the formation is finished, the mixture is heated to 99.9% CO 2 Curing at a relative humidity of 70 percent and a pressure of 0.2MPa at 25 ℃.
The preparation method of the pre-solvent solution comprises the following steps: will contain CO 2 The industrial tail gas passes through a pipeline provided with alcohol amine water solution spraying or misting, so that the alcohol amine water solution absorbs CO in the tail gas 2 Introducing CO in the gas phase 2 Transition to a stable liquid state.
Comparative example 1 was deionized water instead of the pre-solvent solution, and the other examples were the same as examples 1 to 3.
Comparative examples 2-4 are examples 1-3, respectively, in which the alkanolamine solution did not previously absorb CO 2 Can be used as mixing water.
The mechanical properties of the ultra-high performance concrete obtained in the examples and comparative examples are shown in table 5.
TABLE 5 compressive Strength (MPa) for UHPC curing at a particular age
The CO is illustrated by combining examples 1-3 and comparative example 1 2 The pre-solvent obviously improves the mechanical property of the concrete, and the compressive strength and the flexural strength of the concrete meet the requirement of superAnd (5) high-performance concrete standard.
The results, taken in conjunction with examples 1-3 and comparative examples 2-4, demonstrate that CO was not previously absorbed 2 Under the condition, the alcohol amine solution can improve the compression strength and the breaking strength of the concrete, but can not meet the performance requirement of the ultra-high performance concrete.
FIGS. 1-3 are product topography maps for example 1, comparative example 1, and comparative example 2, respectively. The result shows that the product calcium carbonate grows into micron-sized fiber shape in the presence of the alcohol amine solution. Compared with the concrete flexural strength results of the concrete of example 1, the concrete of comparative example 1 and the concrete of comparative example 4, the micron-sized fibrous calcium carbonate plays a role in toughening the fibers and improves CO 2 Driving the flexural strength of the hardened ultra-high performance concrete.
The above embodiments are merely examples for clearly illustrating the present invention and do not limit the present invention. Other variants and modifications will be apparent to those skilled in the art in light of the foregoing description, which are not necessarily exhaustive of all embodiments and are therefore intended to be within the scope of the invention.
Claims (10)
1. The ultra-high performance concrete hardened by driving carbon dioxide is characterized by comprising 60-80% of low-calcium negative carbon clinker, 0-30% of steel slag powder, 0-20% of silica fume and 10-20% of CO by weight percentage 2 A pre-solvent solution and 0.5-5% of water reducing agent.
2. The ultra-high performance concrete of claim 1, wherein the pre-solvent solution is prepared by: will contain CO 2 The industrial tail gas passes through a pipeline provided with alcohol amine water solution spraying or misting, so that the alcohol amine water solution absorbs CO in the tail gas 2 Introducing CO in the gas phase 2 Transition to a stable liquid state.
3. The ultra-high performance concrete according to claim 2, wherein the aqueous alcohol amine solution is one or a mixture of more than two of triethanolamine aqueous solution, N-methyldiethanolamine aqueous solution, diethanolamine aqueous solution, 2-amino-2-methyl-1-propanol aqueous solution or ethanolamine aqueous solution, and the mass concentration of the alcohol amine in the alcohol amine aqueous solution is 10-80%.
4. The ultra-high performance concrete of claim 1, wherein the major mineral phases of said low-calcium carbon-negative clinker are gamma-dicalcium silicate, tricalcium disilicate, monocalcium silicate and dicalcium magnesium disilicate; the sum of the four clinker phases in the clinker is more than 70 percent by weight.
5. The ultra-high performance concrete according to claim 1, wherein the filler comprises steel slag powder and silica fume, and the specific surface area of each of the ultra-fine steel slag powder and the ultra-fine silica fume is more than 600m 2 /kg。
6. The ultra-high performance concrete of claim 1, wherein the interior of the ultra-high performance concrete comprises micron-sized calcium carbonate fibers having a fiber diameter of about 2 to 10 microns, a fiber length of about 5 to 200 microns, and a ratio of length to diameter of about 5 to 20.
7. The method for preparing the ultra-high performance concrete according to claim 1, wherein the method is characterized in that CO is added 2 And (3) uniformly mixing the pre-solvent solution and other dry powder raw materials, pressing and forming, and then carrying out pressure curing.
8. The method for preparing ultra-high performance concrete according to claim 7, wherein the compression molding is performed under a pressure of 10 to 100 MPa.
9. The method for preparing ultra-high performance concrete according to claim 7, wherein the curing temperature of pressure curing is 20-60 ℃ and the curing humidity is 50-80%.
10. Preparation of the ultra-high Performance concrete according to claim 7Method, characterized in that the cured CO is carbonized 2 Volume concentration range of 15-99.9%, CO 2 The curing pressure is 0-0.5MPa.
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| CN117839388A (en) * | 2023-11-17 | 2024-04-09 | 华东理工大学 | Method for absorbing carbon dioxide in methanol reforming hydrogen fuel cell and preparing concrete by adopting absorption product |
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Application publication date: 20221108 |