CN116425441A - Preparation method of carbon-fixing type inactive admixture and ready-mixed concrete composition - Google Patents
Preparation method of carbon-fixing type inactive admixture and ready-mixed concrete composition Download PDFInfo
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- CN116425441A CN116425441A CN202310195102.2A CN202310195102A CN116425441A CN 116425441 A CN116425441 A CN 116425441A CN 202310195102 A CN202310195102 A CN 202310195102A CN 116425441 A CN116425441 A CN 116425441A
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- 239000004567 concrete Substances 0.000 title claims abstract description 61
- 239000000203 mixture Substances 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000002699 waste material Substances 0.000 claims abstract description 64
- 239000004568 cement Substances 0.000 claims abstract description 61
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000002002 slurry Substances 0.000 claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000001238 wet grinding Methods 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 19
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 15
- 238000004062 sedimentation Methods 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 23
- 239000004576 sand Substances 0.000 claims description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 239000011395 ready-mix concrete Substances 0.000 claims description 2
- 230000036571 hydration Effects 0.000 abstract description 11
- 238000006703 hydration reaction Methods 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 238000003763 carbonization Methods 0.000 abstract description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 6
- 239000011707 mineral Substances 0.000 abstract description 6
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010899 nucleation Methods 0.000 abstract description 3
- 230000006911 nucleation Effects 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 abstract description 2
- 239000010419 fine particle Substances 0.000 abstract description 2
- 238000005381 potential energy Methods 0.000 abstract description 2
- 238000002425 crystallisation Methods 0.000 abstract 1
- 230000008025 crystallization Effects 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 10
- 238000003756 stirring Methods 0.000 description 9
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000000354 decomposition reaction Methods 0.000 description 7
- 238000007873 sieving Methods 0.000 description 7
- 239000004575 stone Substances 0.000 description 7
- 239000011859 microparticle Substances 0.000 description 6
- 235000010755 mineral Nutrition 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000009919 sequestration Effects 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
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The application discloses a preparation method of a carbon-fixing type inactive admixture and a ready-mixed concrete composition. The preparation method comprises the following steps: A. providing construction waste micro powder A, wherein the particle size of the construction waste micro powder A is less than or equal to 2mm; B. fully mixing cement waste slurry B in a sedimentation tank of a commercial mixing station with construction waste micro powder A to form a waste slurry carbon-fixing material C; C. and wet grinding the waste slurry carbon-fixing material C under the condition of introducing carbon dioxide gas to fix carbon. The carbon-fixing inactive admixture prepared by the method can decompose C-S-H gel and at least part of calcium-magnesium-containing mineral phase into fine particles in decalcification reaction, plays a role of filling, can be used as nucleation sites in a cement hydration crystallization stage, breaks potential energy barriers, accelerates cement hydration process, reduces cement consumption when used for concrete production, has a carbonization rate of more than 10%, improves carbon sealing effect, and meanwhile, not only locally obtains materials, but also obviously improves the strength of the concrete, and can be widely popularized.
Description
Technical Field
The application relates to the technical field of green concrete and civil engineering materials, in particular to a preparation method of a carbon-fixing type inactive admixture and a ready-mixed concrete composition.
Background
The building industry in China has been rapidly developed for 08 years until now, the total scale of the building sites in China is continuously expanded, so that the requirements of building materials are continuously increased, the carbon dioxide emission of the large class of buildings is continuously increased year by year, the green rate requirements of the buildings are continuously increased, the crude steel yield in China is over 50% of the world, about two tons of carbon dioxide is discharged per ton of crude steel produced, the other carbon dioxide emission source is cement, the cement is used as the 'muscle' of the building, the consumption of the cement is huge, the cement is subjected to the 'two grinding and one firing' production process in the production process, about half ton of carbon dioxide is discharged per ton of cement clinker produced in cement factories, the cement price is continuously increased in recent years, the current cement price is 620 yuan/ton, a plurality of problems can be solved when the cement consumption is reduced when a method is found, the cement is used as a cementing material in the concrete, the cement plays a key role in forming the concrete strength, the cement product is bonded, and the cement can bear the concrete strength in a part of the concrete bearing the concrete, and the concrete is not influenced by the cement bearing the concrete strength.
Disclosure of Invention
In view of the above, the present application provides a method for preparing a carbon-fixing type inactive admixture and a ready-mixed concrete composition, which can reduce the cement consumption in the ready-mixed concrete and obtain better compressive strength.
Based on the technical problems found in the foregoing, the inventor notices that the commercial mixing station can clean the stirring tank after the concrete tank truck is transported to play concrete, so that a large amount of concrete waste slurry is remained in the sedimentation tank, the concrete waste slurry is soaked in water, cement in the sedimentation tank is different from old and new, and is difficult to distinguish and use, but calcium hydroxide is generated by hydration of the cement, so that the sedimentation tank is alkaline as a whole, and reaction conditions are provided for carbon fixation reaction.
The method is characterized in that a large amount of cement waste slurry in a commercial mixing station is used for carbon fixation, a large amount of carbon fixation products are obtained, the mineral composition of the carbon fixation products is carbonate besides hydration products generated by cement, the mineral composition of the cement waste slurry after the carbon fixation process is consistent with the mineral composition of the cement after the cement hydration, and impurities in the waste slurry are basically only residual fine sand which is the component contained in concrete, so the carbon fixation waste slurry can be used as an inactive admixture of the concrete.
After the inventor unexpectedly discovers that the carbon-fixing waste slurry has the possibility of an inactive admixture, and system experiments prove that the inactive admixture can only generally react with the cementing material, the dosage of the cementing material in unit volume of concrete is reduced, so that the strength of the concrete is reduced, a carbon-fixing product of waste cement can be used as the inactive admixture of the concrete, and the waste slurry of the concrete in a sedimentation tank of a commercial mixing station is soaked in alkaline water for a long time, so that calcium ions and magnesium ions contained in the cement are dissolved out, and a large amount of calcium hydroxide is produced by hydration of the waste slurry of the concrete in the sedimentation tank, thereby providing reaction conditions for carbonization reaction.
When wet milling carbon fixation is utilized to treat the concrete waste slurry, the stirring shaft can stir the originally viscous concrete waste slurry, fully contacts with high-concentration carbon dioxide, and under the impact action of a grinding medium, agglomerated cement can be smashed, so that fresh surfaces of cement fragments are continuously exposed to contact with the high-concentration carbon dioxide, the carbon fixation efficiency of the waste cement is greatly improved, fine particles in the waste slurry can be ground to smaller particle sizes by a high-rotation-speed wet mill, the fresh surfaces are exposed, the total carbon fixation amount is improved again, and in the process, C-S-H gel and calcium-magnesium-containing mineral phases generated by fully hydrating the waste cement and construction waste micropowder can be mixed with CO 2 After combination, decalcification reaction is carried out, decalcification decomposition is completed at the same time of carbon fixationThe carbonization product is generated in the slurry, a large number of nano-scale microparticles are generated, the carbon-fixing slurry rich in nano-scale microparticles is used as an inactive admixture for producing concrete, the cement is saved, the cost is reduced, the microparticles generated in the decalcification reaction process can play a role in filling, the concrete structure is compact, the finer nano-scale microparticles in the microparticles can be used as nucleation sites, potential energy barriers of the cement induction period are broken, the hydration progress of the cement is accelerated, and macroscopic characterization is that the early strength and the later strength of the concrete are obviously improved.
CO 2 +H 2 O+Ca 2 + →CaCO3↓+2H + (alkaline environment)
According to the method, the cement stone generated by cement hydration is replaced by the carbonate generated in the carbonization reaction, the generation of the carbonate can also play a role in bonding other materials, and chemical bonds between carbonate molecular structures are more stable than physical bonds between cement stone molecular structures, so that the carbonization reaction is performed by using the carbon-fixing material, the effect of removing carbon and fixing carbon can be achieved, a carbon skeleton can be generated, meanwhile, C-S-H gel and calcium-magnesium-containing mineral phases are decomposed after decalcification in the carbon-fixing process, and the obtained microparticles serve as nucleation sites for cement hydration, accelerate the cement hydration process, and jointly provide support for early strength of concrete. The method has the advantages that after the test block is molded, carbonization maintenance is used, so that the carbonate produced by carbonization replaces the effect of cement hydration products, the cement consumption is saved, the economic cost is reduced, the method is environment-friendly, the used waste concrete test block and cement waste slurry are obtained locally at a commercial mixing station, the process is simple, and the carbon emission of the commercial mixing station can be reduced.
Based on the above unexpected findings, the present inventors have created the present invention.
In a first aspect, the present application provides a method for preparing a commercial mixing station carbon sequestration inactive admixture, comprising the steps of:
A. providing construction waste micro powder A, wherein the particle size of the construction waste micro powder A is less than or equal to 2mm;
B. fully mixing the cement waste slurry B in the sedimentation tank of the commercial mixing station with the construction waste micro powder A to form a waste slurry carbon-fixing material C;
C. and carrying out wet grinding on the waste slurry carbon-fixing material C under the condition of introducing carbon dioxide gas to fix carbon, thereby obtaining a carbon-fixing inactive admixture D.
Suitably, but not limitatively, the cement waste slurry B and the construction waste micro powder A are fully mixed until the fluidity is 160-200 mm.
Suitably, but not limitatively, the particle size of the calcium hydroxide is 0.8-2 μm.
Suitably, but not by way of limitation, the wet milling is carried out at a rotational speed of 300-1500r/min.
Suitably, but not by way of limitation, the wet milling time is 15 to 40 minutes.
Suitably, but not by way of limitation, the filling rate of the equipment implementing the wet milling is not less than 80%.
Suitably, but not by way of limitation, the construction waste micro powder A is obtained by crushing the test block by a crusher, and then grinding again by a ball mill until the particle size of the test block is equivalent to that of fine sand used in concrete, thereby obtaining the construction waste micro powder A.
Suitably, but not by way of limitation, the carbon dioxide gas is at a concentration of 60 to 99.9%.
In a second aspect, the present application provides a ready-mix concrete composition comprising a carbon-fixed inactive admixture resulting from the above-described preparation method.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be further illustrated, but is not limited, by the following examples.
The sources of the raw materials referred to herein are as follows:
the cement waste slurry is sourced from a mixing station of a certain manufacturer of the river Xia Ou of the Wuhan city, and other raw materials which are not mentioned are all commercially available.
The cement waste slurry is obtained from a tank car cleaning site pool and a waste slurry sedimentation tank, the pH value of the cement waste slurry is between 12 and 14, and the chemical composition analysis is carried out after the sample is dried to prepare the following table:
example 1
Obtaining dry cement waste pulp and waste concrete powder in a three-stage sedimentation tank of a commercial mixing station, adding water to prepare 500kg of carbon-fixing waste pulp with the fluidity of 180mm, testing the pH value of the slurry to be 12.5, opening an air inlet valve to introduce carbon dioxide with the concentration of 60% into a hopper, adjusting the valve to ensure that the indication number of a pH tester at an air outlet is less than or equal to 7, starting wet grinding carbon fixing at 500r/min, sieving for 20min to obtain a carbon-fixing inactive blending material, taking 175kg of water, 368kg of cement, 512kg of sand, 1252kg of stone and 92kg of inactive blending material, uniformly stirring and fully vibrating, taking part of concrete to be injected into a 100x100mm mould, removing the mould after the surface is scraped, placing the mould into a standard curing chamber with the temperature of 2422 ℃ and the humidity of RH of less than or equal to 40 for curing to a specified age, continuing curing to 56d, measuring the 3d strength to be 11.3MPa, obtaining 1g of sieved and tested micro powder after sampling the 3d concrete test block, and obtaining the sample powder with the mass loss of 0.5MPa in a carbonate decomposition temperature section, and the compression strength of the sample is about 5.35 MPa in the wet grinding process.
Example 2
Obtaining thinner cement waste pulp and waste concrete powder in a three-stage sedimentation tank of a commercial mixing station, preparing 500kg of carbon-fixed waste pulp with the fluidity of 180mm, testing the pH value of the slurry to be 10.1, opening an air inlet valve, introducing carbon dioxide with the concentration of 60% into a hopper, adjusting the valve to ensure that the indication number of a pH tester at an air outlet is less than or equal to 7, starting wet grinding carbon fixation at 500r/min, keeping the indication number unchanged after 20min, sieving to obtain a carbon-fixed inactive admixture, taking 175kg of water, 368kg of cement, 512kg of sand and 1252kg of stone and 92kg of the inactive admixture, uniformly stirring and fully vibrating, taking part of concrete into a 100x100mm mold, putting the concrete into a standard curing chamber with the temperature of 2422 ℃ and the humidity RH of less than or equal to 40 after the regulated period, removing the mold, continuously curing to 56d, measuring the 3d strength to be 12.9MPa, sampling the 3d concrete test block to obtain 1g of sieving, testing the sample, and carrying out the test on the sample mass loss of the sample in a decomposition temperature section to be 0.032 MPa, and the compression strength of the sample in a wet grinding carbon test block to be about 2.28 MPa.
Example 3
Obtaining dry cement waste pulp and waste concrete powder in a three-stage sedimentation tank of a commercial mixing station, adding water to prepare 500kg of carbon-fixed waste pulp with the fluidity of 180mm, testing the pH value of the slurry to be 12.7, opening an air inlet valve to introduce carbon dioxide with the concentration of 99.9% into a hopper, adjusting the valve to ensure that the indication number of a pH tester at an air outlet is less than or equal to 7, starting wet grinding of carbon at 900r/min, ensuring that the indication number is not changed after 17min, sieving to obtain a carbon-fixed inactive admixture, taking 175kg of water, 368kg of cement, 512kg of sand, 1252kg of stone and 92kg of inactive admixture, uniformly stirring and fully vibrating, taking part of concrete into a 100x100mm mould, putting the mould with the pH value of 12.7 in a standard curing chamber with the temperature of 2422 ℃ and the humidity of less than or equal to 40, removing the mould, continuously curing the mould to 56d, testing the 3d strength to be 12.4MPa, obtaining 1g of sieved concrete after sampling, testing the sample with the mass of the sample in a carbonate decomposition temperature section to obtain the sample with the compression strength of 567.37 MPa, and the compression strength of the sample is about 9.37 MPa in the wet grinding process of the sample is tested at the carbon at the mass of the carbonate decomposition temperature section of the sample is about 7.37 MPa.
Example 4
Obtaining dry cement waste pulp and waste concrete powder in a three-stage sedimentation tank of a commercial mixing station, adding water to prepare 500kg of carbon-fixed waste pulp with the fluidity of 180mm, testing the pH value of the carbon-fixed waste pulp to be 12.9, opening an air inlet valve to introduce carbon dioxide with the concentration of 99.9% into a hopper, adjusting the valve to ensure that the indication number of a pH tester at an air outlet is less than or equal to 7, starting wet grinding of carbon at 900r/min, ensuring that the indication number is not changed after 10min, sieving to obtain a carbon-fixed inactive admixture, taking 175kg of water, 322kg of cement, 512kg of sand, 1252kg of stone and 138kg of inactive admixture, uniformly stirring and fully vibrating, taking part of concrete, injecting the concrete into a 100x100mm mould, scraping the surface, placing the concrete into a standard curing chamber with the temperature of 2422 ℃ and the humidity of less than or equal to 40, removing the mould, continuously curing the concrete until the pH value is 56d, testing the strength of 3d is 13.9MPa, obtaining 1g of sieved concrete after sampling, testing the sample after the sample of 3d concrete is subjected to wet grinding, and the mass loss of the sample is about 0.8 MPa in a carbonate decomposition temperature section is about 7.8 MPa, and the compression strength of the sample is tested at the carbon loss of the wet grinding strength is about 5MPa.
Example 5
Obtaining dry cement waste pulp and waste concrete powder in a three-stage sedimentation tank of a commercial mixing station, adding water to prepare 500kg of carbon-fixed waste pulp with the fluidity of 180mm, testing the pH value of the slurry to be 12.9, opening an air inlet valve to introduce carbon dioxide with the concentration of 99.9% into a hopper, adjusting the valve to ensure that the indication number of a pH tester at an air outlet is less than or equal to 7, starting wet grinding of carbon at 600r/min, ensuring that the indication number is not changed after 10min, sieving to obtain a carbon-fixed inactive admixture, taking 175kg of water, 322kg of cement, 512kg of sand, stone 1252kg and 138kg of inactive admixture, uniformly stirring and fully vibrating, taking part of concrete into a 100x100mm mould, putting the mould with the pH value of 2422 ℃ and the humidity RH of less than or equal to 40 after the standard curing chamber is cut off, continuously curing to 56d, testing the 3d strength to be 12.4MPa, obtaining 1g of sieving concrete after sampling, testing the concrete sample with the 3d, and obtaining a sample mass of the sample with the decomposition temperature of the carbonate to be 082.9 MPa, and the compression strength of the sample with the carbon loss of the sample mass is about 20.9 MPa and the compression strength of the sample is about 2.37 MPa in the test process of the wet grinding process.
Comparative example 1
Taking 175kg of water, 460kg of cement, 512kg of sand and 1252kg of cobble, uniformly stirring and fully vibrating, taking part of concrete, pouring the concrete into a 100x100mm mould, putting the mould into a standard curing chamber with the temperature 2422 ℃ and the humidity RH of less than or equal to 40 after the surface is scraped, curing the mould for a specified age, removing the mould, and continuing curing until the mould is 56d, wherein the 3d compressive strength is 10.5MPa, the 28d compressive strength is 32.7MPa and the 56d compressive strength is 37.5MPa.
Table 1 table of compressive strengths of concrete using admixture
From the data in table 1, it can be seen that the carbon dioxide concentration directly affects the carbon fixation rate in the wet-milling carbon fixation process, and the higher the carbon dioxide concentration, the faster the carbon fixation rate of the carbon fixation material; the stronger the alkalinity of the carbon-fixing waste slurry is, the higher the carbon-fixing efficiency of wet grinding carbon-fixing is; under the condition of the same carbon dioxide concentration, the higher the rotating speed of the wet mill, the higher the carbon fixation efficiency of the inactive admixture, and the carbon fixation inactive admixture can obviously improve the early strength of concrete without obviously influencing the middle and later strengths.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application.
Claims (9)
1. The preparation method of the carbon-fixing type inactive admixture is characterized by comprising the following steps of:
A. providing construction waste micro powder A, wherein the particle size of the construction waste micro powder A is less than or equal to 2mm;
B. fully mixing the cement waste slurry B in the sedimentation tank of the commercial mixing station with the construction waste micro powder A to form a waste slurry carbon-fixing material C;
C. and carrying out wet grinding on the waste slurry carbon-fixing material C under the condition of introducing carbon dioxide gas to fix carbon, thereby obtaining a carbon-fixing inactive admixture D.
2. The preparation method according to claim 1, wherein the cement waste slurry B and the construction waste micro powder A are fully mixed until the fluidity is 160-200 mm.
3. The method according to claim 1, wherein the calcium hydroxide has a particle size of 0.8 to 2. Mu.m.
4. The method according to claim 1, wherein the rotational speed of the wet milling is 300-1500r/min.
5. The method according to claim 1, wherein the wet milling time is 15 to 40 minutes.
6. The method according to claim 1, wherein the filling rate of the apparatus for carrying out the wet milling is not less than 80%.
7. The preparation method according to claim 1, wherein the construction waste micro powder A is obtained by crushing the test block by a crusher, and grinding again by a ball mill until the particle size of the test block is equivalent to that of fine sand used in concrete.
8. The method according to claim 1, wherein the concentration of the carbon dioxide gas is 60 to 99.9%.
9. A ready-mix concrete composition comprising the carbon-fixing non-reactive admixture obtained by the process of claim 1.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115180854A (en) * | 2022-05-30 | 2022-10-14 | 湖北工业大学 | Preparation and application method of carbon-fixing type commercial concrete waste slurry |
| CN115215571A (en) * | 2022-05-30 | 2022-10-21 | 湖北工业大学 | Carbon fixation treatment and recycling method for commercial mixed solid waste |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115180854A (en) * | 2022-05-30 | 2022-10-14 | 湖北工业大学 | Preparation and application method of carbon-fixing type commercial concrete waste slurry |
| CN115215571A (en) * | 2022-05-30 | 2022-10-21 | 湖北工业大学 | Carbon fixation treatment and recycling method for commercial mixed solid waste |
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