CN116535169B - Carbon-absorbing carbon-fixing concrete and preparation method thereof - Google Patents
Carbon-absorbing carbon-fixing concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 43
- 239000004568 cement Substances 0.000 claims abstract description 60
- 229910001719 melilite Inorganic materials 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002131 composite material Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000010881 fly ash Substances 0.000 claims abstract description 18
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 238000004381 surface treatment Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 32
- 239000000843 powder Substances 0.000 claims description 29
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 17
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 15
- -1 perfluoroalkyl alcohol Chemical compound 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 8
- 239000011707 mineral Substances 0.000 claims description 8
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 7
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 7
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 7
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 7
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 7
- 239000000347 magnesium hydroxide Substances 0.000 claims description 7
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 7
- HJVAFZMYQQSPHF-UHFFFAOYSA-N 2-[bis(2-hydroxyethyl)amino]ethanol;boric acid Chemical compound OB(O)O.OCCN(CCO)CCO HJVAFZMYQQSPHF-UHFFFAOYSA-N 0.000 claims description 6
- 229910001597 celsian Inorganic materials 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000007605 air drying Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 238000001694 spray drying Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 241000723420 Celtis Species 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 85
- 239000001569 carbon dioxide Substances 0.000 abstract description 42
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 42
- 229910052799 carbon Inorganic materials 0.000 abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 34
- 238000010521 absorption reaction Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 21
- 238000012360 testing method Methods 0.000 description 13
- 238000011056 performance test Methods 0.000 description 9
- 239000000378 calcium silicate Substances 0.000 description 7
- 229910052918 calcium silicate Inorganic materials 0.000 description 7
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 150000002191 fatty alcohols Chemical class 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- JCAYXDKNUSEQRT-UHFFFAOYSA-N 2-aminoethoxyboronic acid Chemical compound NCCOB(O)O JCAYXDKNUSEQRT-UHFFFAOYSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- ONJQDTZCDSESIW-UHFFFAOYSA-N polidocanol Chemical compound CCCCCCCCCCCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO ONJQDTZCDSESIW-UHFFFAOYSA-N 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method 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
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/041—Aluminium silicates other than clay
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/043—Alkaline-earth metal silicates, e.g. wollastonite
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of concrete, and particularly discloses carbon-absorbing and carbon-fixing concrete and a preparation method thereof. The raw materials of the carbon-absorbing carbon-fixing concrete comprise the following components in parts by weight: 120-200 parts of melilite composite cement, 5-20 parts of water reducer, 2-10 parts of air entraining agent, 140-210 parts of water, 150-240 parts of fly ash, 500-600 parts of ceramsite, 400-500 parts of sand and 160-260 parts of water-based gel. The preparation method comprises the following steps: s1, preparing melilite composite cement; s2, carrying out surface treatment on the ceramsite; s3, preparing the carbon-absorbing carbon-fixing concrete. The concrete prepared by the application is environment-friendly concrete capable of achieving the negative carbon emission effect, has good carbon absorption and carbon fixation capacity, and can reduce the carbon dioxide emission in the curing and forming process of the concrete.
Description
Technical Field
The application relates to the technical field of concrete, in particular to carbon-absorbing carbon-fixing concrete and a preparation method thereof.
Background
Concrete is one of important raw materials in construction engineering construction, and along with the development of urban buildings, a large amount of construction engineering is planned or implemented every year at present, so that the concrete demand on the market is huge, but a large amount of concrete is produced, and a large amount of carbon dioxide is released in the hardening process of cement in the concrete during curing, so that the greenhouse effect is gradually increased. In the related art, there are schemes that can solve this problem, some concrete manufacturing enterprises adopt means for reducing the addition amount of cement to prepare low-carbon concrete, but the reduction of the addition amount of cement may cause the decrease of the mechanical properties of concrete, and the technical scheme only reduces the emission of carbon dioxide caused by the hardening reaction of cement, and under the condition of huge concrete preparation amount base, the emission pressure of carbon dioxide is still caused to urban environment.
Therefore, in order to further alleviate the problems of the loss of mechanical strength of concrete caused by the reduction of the added concrete of cement and the excessive carbon emission of common concrete, the development of the concrete which absorbs and solidifies carbon and has the up-to-standard mechanical property is needed.
Disclosure of Invention
In order to further improve the carbon absorbing and fixing capability of the concrete, the application provides the carbon absorbing and fixing concrete and a preparation method thereof, and the environment-friendly concrete can absorb carbon dioxide.
In a first aspect, the application provides a carbon-absorbing carbon-fixing concrete, which adopts the following technical scheme:
The carbon-absorbing carbon-fixing concrete comprises the following raw materials in parts by weight: 120-200 parts of celsian composite cement, 5-20 parts of water reducer, 2-10 parts of air entraining agent, 140-210 parts of water, 150-240 parts of fly ash, 500-600 parts of ceramsite, 400-500 parts of sand and 160-260 parts of water-based gel; wherein the celsian cement is prepared by compounding celsian powder, cement, magnesium hydroxide and ethanolamine borate.
By adopting the technical scheme, the melilite composite cement is adopted, so that the effects of forming glue sand, exciting hydration and the like on the cement can be achieved, and the cement component only accounts for half of the weight of the melilite composite cement, so that the amount of carbon dioxide released by the concrete itself caused by adding the cement in the preparation of the concrete can be reduced. In addition, the melilite is a mineral formed by combining carbon dioxide substances such as magnesium, aluminum, calcium silicate and the like, various components in the mineral have absorption capacity on carbon dioxide, the aqueous gel applied in the application can promote reaction with carbon dioxide to generate carbonic acid, and then the carbon dioxide which is preliminarily combined with the aqueous gel is further fixed in a concrete system, so that the calcium silicate is formed and does not overflow, the carbon absorption and carbon fixation performances are obviously improved, and the concrete has good carbon absorption and carbon fixation effects.
Preferably, the raw materials of the melilite composite cement comprise 60-80 parts of melilite powder, 10-50 parts of triethanolamine borate, 100-130 parts of cement and 30-40 parts of magnesium hydroxide by weight, wherein the weight parts of the raw materials are based on the melilite composite cement.
Preferably, the aqueous gel is preferably a gamma-C 2 S gel.
Preferably, the gamma-C2S gel comprises, by weight, 30-50 parts of steel slag powder, 30-60 parts of perfluoroalkyl alcohol polyoxyethylene ether, 2-8 parts of carboxymethyl cellulose, 110-150 parts of water and 80-110 parts of gamma-C 2 S mineral powder, wherein the parts by weight of the raw materials are based on the gamma-C 2 S gel.
By adopting the technical scheme, the surface of the added ceramsite aggregate is further coated with gel prepared by mixing gamma-C 2 S calcium silicate, steel slag powder and other raw materials, and the gamma-C 2 S calcium silicate can react with carbon dioxide to generate calcium carbonate, so that the carbon dioxide is fixed in a concrete system without overflowing to improve the carbon absorption and carbon fixation performance, and the porous structure of the ceramsite and the strong carbon philic capability of perfluoroalkyl alcohol polyoxyethylene ether are utilized to structurally further improve the adsorption capacity to carbon dioxide; in the process of absorbing and contacting carbon dioxide by the steel slag through gel, the activity of the steel slag is excited, so that the mechanical property of the carbon-absorbing and carbon-fixing concrete can be improved after the gel containing steel slag powder is solidified.
Preferably, the particle size of the ceramsite is 5mm-15mm.
Preferably, the fly ash is class I fly ash.
By adopting the technical scheme, the concrete using the class I fly ash can ensure the basic mechanical properties of the concrete on the basis of greatly reducing the consumption of cement, and can reduce the carbon dioxide emission caused by adding a large amount of cement.
In a second aspect, the application provides a preparation method of carbon-adsorbing and carbon-fixing concrete, which adopts the following technical scheme:
the preparation method of the carbon-absorbing carbon-fixing concrete comprises the following steps:
S1, preparing melilite composite cement;
s2, carrying out surface treatment on ceramsite: carrying out surface treatment operation of spraying aqueous gel on the surface of the ceramsite by adopting a spray drying method, and carrying out air drying and curing after coating is finished to obtain modified ceramsite;
S3, preparing carbon-absorbing and carbon-fixing concrete: and mixing and uniformly stirring the melilite cement, the water reducer, the air entraining agent, the water, the fly ash, the modified ceramsite and the sand.
Preferably, the aqueous gel is gamma-C 2 S gel, and the preparation method comprises the steps of firstly mixing and stirring steel slag powder, perfluoroalkyl alcohol polyoxyethylene ether and gamma-C 2 S mineral powder uniformly, then adding water for dissolving and continuously stirring, and finally adding carboxymethyl cellulose and stirring uniformly to obtain gamma-C2S gel.
In summary, the application has the following beneficial effects:
1. The composite cement is prepared by adding the melilite powder which is formed by combining magnesium, aluminum, calcium silicate and the like and can be combined with carbon dioxide, so that the melilite composite cement can absorb the carbon dioxide generated by itself, and the carbon dioxide is fixed in a concrete system without overflowing, so that the concrete achieves good carbon absorption and carbon fixation effects;
2. The application adopts the aqueous gel prepared by mixing gamma-C 2 S calcium silicate, steel slag powder and other raw materials; on one hand, after the gel containing steel slag is coated and solidified, the hardness of the ceramsite aggregate can be improved, so that the mechanical property of the carbon-absorbing and carbon-fixing concrete is improved, on the other hand, gamma-C 2 S calcium silicate can react with carbon dioxide to generate calcium carbonate, so that the carbon dioxide is fixed in a concrete system without overflowing to improve the carbon-absorbing and carbon-fixing property, and meanwhile, the adsorption capacity to the carbon dioxide is further improved structurally by utilizing the porous structure of the ceramsite and the carbon-philic capacity of perfluoroalkyl alcohol polyoxyethylene ether; the scheme has obvious synergistic effect, and the carbon absorbing and fixing capacity of the concrete is greatly improved;
3. the application adopts the I-grade fly ash to reduce the consumption of cement, and the cement content in the composite cement only accounts for half of the weight ratio, thereby reducing the carbon dioxide amount released by the prepared concrete.
Detailed Description
The application is further described in detail below with reference to the following examples, which are specifically described: the following examples, in which no specific conditions are noted, are conducted under conventional conditions or conditions recommended by the manufacturer, and the raw materials used in the following examples are commercially available from ordinary sources except for the specific descriptions.
The cement is P.C32.5R silicate cement;
the water reducer adopts an SPC-100 polycarboxylic acid high-performance water reducer, wherein the solid content of SPC-100 type polycarboxylic acid is 40%;
The air entraining agent adopts sodium lignin sulfonate in lignin sulfonate;
The sand is grade II sand, the fineness modulus is 2.3, and the mud content is 1.0%;
The perfluoroalkyl alcohol polyoxyethylene ether used in the application is produced by Sichuan Ruikiban chemical material Co., ltd, and the model is FEO-X2-300;
The fatty alcohol polyoxyethylene ether used in the application is selected from fatty alcohol polyoxyethylene ether with the model of AEO-9 produced by Shandong Xin full-growth chemical technology Co.
Preparation example of aqueous gel
Preparation example 1
The preparation method of the gamma-C 2 S gel comprises the steps of mixing and stirring 30kg of steel slag powder, 30kg of perfluoroalkyl alcohol polyoxyethylene ether and 80kg of gamma-C2S mineral powder uniformly, then adding 110kg of water for dissolving and continuously stirring, and finally adding 2kg of carboxymethyl cellulose and stirring uniformly to obtain the gamma-C 2 S gel.
Preparation example 2
The preparation method of the gamma-C 2 S gel comprises the steps of mixing and stirring 40kg of steel slag powder, 45kg of perfluoroalkyl alcohol polyoxyethylene ether and 95kg of gamma-C 2 S mineral powder uniformly, adding 130kg of water to dissolve and continuously stirring, and finally adding 5kg of carboxymethyl cellulose and stirring uniformly to obtain the gamma-C 2 S gel.
Preparation example 3
The preparation method of the gamma-C2S gel comprises the steps of mixing and stirring 50kg of steel slag powder, 60kg of perfluoroalkyl alcohol polyoxyethylene ether and 110kg of gamma-C 2 S mineral powder uniformly, then adding 150kg of water to dissolve and continuously stirring, and finally adding 8kg of carboxymethyl cellulose and stirring uniformly to obtain the gamma-C 2 S gel.
Preparation example 4
The process was carried out in accordance with preparation example 1, except that no steel slag was added to the gamma-C 2 S gel raw material.
Preparation example 5
The procedure of preparation 1 was followed except that the perfluoroalkyl alcohol-polyoxyethylene ether in preparation 1 was replaced with a fatty alcohol-polyoxyethylene ether in the same amount.
Preparation example 6
The procedure of preparation 1 was followed except that no perfluoroalkyl alcohol polyoxyethylene ether was added to the starting material.
Comparative preparation example 1
The preparation method of the red mud water-based gel comprises the steps of mixing and stirring 40kg of steel slag powder, 45kg of perfluoroalkyl alcohol polyoxyethylene ether and 95kg of red mud uniformly, adding 130kg of water for dissolving and continuously stirring, and finally adding 5kg of carboxymethyl cellulose and stirring uniformly to obtain the red mud water-based gel.
Examples of carbon-adsorbing and carbon-fixing concrete
Example 1
The preparation method of the carbon-absorbing carbon-fixing concrete comprises the following steps:
s1, preparing a composite melilite cement, sieving melilite powder with a 100-mesh sieve, uniformly mixing 60kg melilite powder, 10kg triethanolamine borate, 100kg cement and 30kg magnesium hydroxide, and placing the mixture in a stirring kettle to stir for 30min to obtain the composite melilite cement;
S2, carrying out surface treatment on ceramsite: 160kg of gamma-C 2 S gel prepared in preparation example 1 is mixed with 500kg of ceramsite by stirring, a spray dryer is adopted, the temperature of a machine head is set to be 95 ℃ to carry out surface spraying gamma-C 2 S gel treatment on the ceramsite, and the ceramsite is air-dried and cured for 6 hours to obtain modified ceramsite; wherein, the grain diameter of the ceramsite is 5mm;
S3, preparing carbon-absorbing and carbon-fixing concrete: 120kg of the melilite cement prepared in the step S1, 5kg of a water reducing agent, 2kg of an air entraining agent, 140kg of water, 150kg of I-level fly ash, 500kg of modified ceramsite and 400kg of sand are mixed, and the mixture is placed in a stirring kettle and stirred for 45min until uniform, thus obtaining the melilite cement.
Example 2
The preparation method of the carbon-absorbing carbon-fixing concrete comprises the following steps:
S1, preparing a composite melilite cement, sieving 70kg melilite powder with a 100-mesh sieve, uniformly mixing the powder with melilite powder, 30kg triethanolamine borate, 115kg cement and 35kg magnesium hydroxide, and placing the mixture in a stirring kettle to stir for 30min to obtain the composite melilite cement;
S2, carrying out surface treatment on ceramsite: mixing 210kg of gamma-C2S gel prepared in preparation example 2 with 550kg of ceramsite under stirring, adopting a spray dryer, setting the temperature of a machine head at 95 ℃ to spray gamma-C 2 S gel on the surface of the ceramsite, and air-drying and curing for 6 hours to obtain modified ceramsite; wherein, the grain diameter of the ceramsite is 10mm;
S3, preparing carbon-absorbing and carbon-fixing concrete: 160kg of the melilite cement prepared in the step S1, 12.5kg of a water reducing agent, 6kg of an air entraining agent, 175kg of water, 195kg of I-grade fly ash, 550kg of modified ceramsite and 450kg of sand are mixed, and the mixture is placed in a stirring kettle and stirred for 45min until uniform, thus obtaining the melilite cement.
Example 3
The preparation method of the carbon-absorbing carbon-fixing concrete comprises the following steps:
s1, preparing a composite melilite cement, sieving 80kg of melilite powder with a 100-mesh sieve, uniformly mixing the powder with melilite powder, 50kg of triethanolamine borate, 130kg of cement and 40kg of magnesium hydroxide, and placing the mixture in a stirring kettle to stir for 30min to obtain the composite melilite cement;
S2, carrying out surface treatment on ceramsite: mixing 260kg of gamma-C 2 S gel prepared in preparation example 3 with 600kg of ceramsite under stirring, adopting a spray dryer, setting the temperature of a machine head at 95 ℃ to spray gamma-C 2 S gel on the surface of the ceramsite, and air-drying and curing for 6 hours to obtain modified ceramsite; wherein, the grain diameter of the ceramsite is 15mm;
S3, preparing carbon-absorbing and carbon-fixing concrete: 200kg of the melilite cement prepared in the step S1, 20kg of a water reducing agent, 10kg of an air entraining agent, 210kg of water, 240kg of I-level fly ash, 600kg of modified ceramsite and 500kg of sand are mixed, and the mixture is placed in a stirring kettle and stirred for 45min until uniform, thus obtaining the melilite cement.
Example 4
The procedure was followed, as in example 2, except that the gamma-C2S gel prepared in preparation example 1 was replaced with the gamma-C 2 S gel prepared in preparation example 4 in equal amounts in the starting materials.
Example 5
The procedure was followed, as in example 2, except that the gamma-C 2 S gel from preparation example 1 was replaced with the gamma-C 2 S gel from preparation example 5 in equal amounts.
Example 6
The procedure was followed, as in example 2, except that the gamma-C 2 S gel from preparation example 1 was replaced with the gamma-C 2 S gel from preparation example 6 in equal amounts.
Example 7
The process of example 2 was carried out with the difference that the class I fly ash in the feed was replaced equally by class II fly ash.
Example 8
The method of example 2 was carried out, except that the ceramsite aggregate in the raw material was replaced with a ceramsite aggregate having a particle size of 20mm in equal amount.
Comparative example
Comparative example 1
The procedure of example 2 was followed except that the ceramsite in the raw material was replaced with crushed stone in equal amounts.
Comparative example 2
The procedure of example 2 was followed except that the melilite composite cement in the raw material was replaced with ordinary commercial cement in equal amounts.
Comparative example 3
The procedure was followed as in example 2, except that no gamma-C 2 S gel was added to the starting material.
Comparative example 4
The procedure of example 2 was followed, except that the gamma-C 2 S gel in preparation example 1 was replaced by the gamma-C 2 S-free red mud aqueous gel prepared in comparative preparation example 1 in equal amounts.
Comparative example 5
The procedure of example 2 was followed, except that the melilite composite cement in the raw material was replaced with ordinary commercial cement in equal amounts, and no gamma-C 2 S gel was added.
Performance test
1. Concrete strength test
2. Carbon absorption and fixation test for concrete
3. Carbon dioxide release test during curing
Detection method
1. And (3) testing the compressive strength of the concrete: the concrete mixed in each example and comparative example was prepared into 100mm X100 mm cube test pieces, and the compressive strength (unit: MPa) of 28d of each test piece was measured according to KGB/T50081-2002, standard of test method for mechanical Properties of ordinary concrete, and the test results are shown in Table 1.
2. And (3) carbon absorption and fixation test of concrete: the concrete mixed in each example and comparative example was prepared into a 100mm×100mm cube test piece by using a test piece of 28d age, and the original mass of the test piece and the mass of the test piece after 90d storage at normal temperature and pressure were recorded to calculate the mass loss rate (unit:%). When carbon dioxide is absorbed by the concrete and combined into calcium carbonate, the quality of the concrete is increased, when the mass loss is not more than 5%, the concrete has carbon absorption and carbon fixation performances, when the mass loss rate is negative, the concrete has increased mass, the carbon absorption and carbon fixation capacities are higher, and the detection results are shown in table 2;
3. carbon dioxide release amount test during curing: the concrete mixed in each example and comparative example is poured into a cube of 100mm multiplied by 100mm, standard curing is carried out for 28d, the carbon dioxide concentration in a curing chamber is monitored by adopting a portable infrared carbon dioxide monitor in the curing process, the initial indoor concentration is detected to be 700PPM, the carbon dioxide concentrations in the initial (2 d), middle (12 d) and final (28 d) stages of curing are respectively recorded, when the carbon dioxide concentration is less than 850PPM, the carbon absorption and carbon fixation capability is shown, when the carbon dioxide concentration is more than 1000PPM, the concrete releases more carbon dioxide, and the detection results are shown in Table 3.
Table 1:
Table 2:
| Detecting items | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 |
| Mass loss rate/% | -0.18 | -0.19 | -0.17 | -0.17 | -0.15 | -0.13 | -0.17 |
| Detecting items | Example 8 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | - |
| Mass loss rate/% | -0.16 | -0.07 | 0.00 | 0.12 | -0.05 | 0.49 | - |
TABLE 3 Table 3
As can be seen from the performance test results of the examples 2 and 4, when the gamma-C2S gel containing no steel slag is used for modifying the ceramsite aggregate, the effect of absorbing carbon dioxide is good, but the improvement of the mechanical properties of the ceramsite aggregate is small, so that the compressive strength and the splitting tensile strength of the concrete are reduced, and a part of mechanical properties are lost.
As can be seen from the performance test results of the examples 2 and 5, after the perfluoroalkyl alcohol polyoxyethylene ether serving as a surface active component with relatively strong carbon dioxide affinity in the gamma-C 2 S gel raw material is replaced by the fatty alcohol polyoxyethylene ether in an equivalent manner, the capturing force of carbon dioxide is reduced, the carbon dioxide absorption rate and total amount are reduced, and the carbon absorption and carbon fixation capacity of the concrete is influenced; as can be seen from the performance test results of examples 1 and 6, when the surface active component is not used, the dispersity of the steel slag is reduced, the phenomenon of uneven reinforcement occurs, the splitting tensile strength of the concrete is affected, and meanwhile, the affinity of carbon dioxide is reduced, and both the carbon absorption and carbon fixation capability and the mechanical property are negatively affected.
As can be seen from the performance test results of example 2 and example 7, the same cement addition amount does not satisfy the condition of maintaining the consistency of the mechanical properties of the concrete and example 1 after the class I fly ash in the raw materials is replaced by the class II fly ash in an equivalent amount, and the compressive strength and the splitting tensile strength of the concrete are reduced.
As can be seen from the performance test results of examples 2 and 8, changing larger aggregate particle size of the ceramsite easily reduces the compressive strength and the cleavage tensile strength, so that it is necessary to control the particle size of the ceramsite within the range specified in the present application; the ceramsite with the particle size smaller than 5mm is not usually manufactured and used because of the low processing cost and the low source of finished products, no obvious positive effect and other factors, and therefore, the ceramsite is not implemented.
As can be seen from the performance test results of example 2 and comparative example 1, after the porous ceramsite is replaced by crushed stone, the mechanical properties are improved, but the fixed carbon dioxide amount is obviously reduced, so that the carbon absorbing and fixing capacity of the concrete is reduced.
As can be seen from the performance test results of example 2 and comparative example 2, after replacing the melilite composite cement with the common commercial cement in equal amount, the amount of carbon dioxide released by the cement itself increases, resulting in a decrease in the amount of carbon dioxide that can be adsorbed by the concrete, and thus the carbon fixable amount of the prepared concrete decreases.
As can be seen from the performance detection results of the embodiment 2 and the comparative example 3, the concrete prepared without adding gamma-C 2 S gel can not achieve the effect of carbon emission, aggravate the emission of carbon dioxide in urban environment, and therefore, the concrete does not have the performance of carbon-absorbing carbon-fixing concrete.
The performance detection results of the embodiment 2 and the comparative example 4 show that the red mud gel without gamma-C 2 S also has the adsorption capacity for carbon dioxide, but the effect is not good after the gamma-C2S gel is used for treating the ceramsite, and the carbon absorption and fixation performances of the concrete are not remarkably improved.
As can be seen from the results of the performance tests of example 2 and comparative example 5, when commercial cement is used and no gamma-C 2 S gel is added, the carbon dioxide emission of the concrete is greatly increased, and the carbon absorbing and fixing capability is lost.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (5)
1. The carbon-absorbing carbon-fixing concrete is characterized by comprising the following raw materials in parts by weight: 120-200 parts of celtis composite cement, 5-20 parts of water reducer, 2-10 parts of air entraining agent, 140-210 parts of water, 150-240 parts of fly ash, 500-600 parts of modified ceramsite, 400-500 parts of sand and 160-260 parts of water-based gel; wherein the melilite composite cement is prepared by compositing melilite powder, cement, magnesium hydroxide and triethanolamine borate; the raw materials of the celsian composite cement comprise, by weight, 60-80 parts of celsian powder, 10-50 parts of triethanolamine borate, 100-130 parts of cement and 30-40 parts of magnesium hydroxide, wherein the weight parts of the raw materials are based on the celsian composite cement; the aqueous gel is gamma-C 2 S gel; the modified ceramsite is obtained by spraying aqueous gel on the surface of the ceramsite through a spray drying method and then air-drying and curing.
2. The carbon-adsorbing and carbon-fixing concrete according to claim 1, wherein: the particle size of the ceramsite is 5mm-15mm.
3. The carbon-adsorbing and carbon-fixing concrete according to claim 1, wherein: the fly ash is class I fly ash.
4. A method for preparing a carbon-adsorbing and carbon-fixing concrete according to any one of claims 1 to 3, comprising the steps of:
S1, preparing melilite composite cement;
s2, carrying out surface treatment on ceramsite: carrying out surface treatment operation of spraying aqueous gel on the surface of the ceramsite by adopting a spray drying method, and carrying out air drying and curing after coating is finished to obtain modified ceramsite;
s3, preparing carbon-absorbing and carbon-fixing concrete: and uniformly mixing and stirring the melilite composite cement, the water reducer, the air entraining agent, the water, the fly ash, the modified ceramsite and the sand.
5. The method for preparing the carbon-adsorbing and carbon-fixing concrete according to claim 4, which is characterized in that: the preparation method of the water-based gel is that the water-based gel is gamma-C 2 S gel, and the preparation method comprises the steps of firstly mixing and stirring steel slag powder, perfluoroalkyl alcohol polyoxyethylene ether and gamma-C 2 S mineral powder uniformly, then adding water for dissolving and continuously stirring, and finally adding carboxymethyl cellulose and stirring uniformly to obtain gamma-C 2 S gel.
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