CN115403295A - Green carbon-reducing concrete additive, green carbon-reducing concrete and preparation method - Google Patents
Green carbon-reducing concrete additive, green carbon-reducing concrete and preparation method Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 126
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000654 additive Substances 0.000 title claims description 19
- 230000000996 additive effect Effects 0.000 title claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims description 53
- 239000002893 slag Substances 0.000 claims description 41
- 239000010881 fly ash Substances 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 239000002699 waste material Substances 0.000 claims description 20
- 239000004576 sand Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 19
- 239000000919 ceramic Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 17
- 244000198134 Agave sisalana Species 0.000 claims description 15
- 239000004575 stone Substances 0.000 claims description 15
- 239000011398 Portland cement Substances 0.000 claims description 14
- 239000010920 waste tyre Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 9
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 239000000292 calcium oxide Substances 0.000 claims description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 7
- 239000000395 magnesium oxide Substances 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 8
- 239000004566 building material Substances 0.000 abstract description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 18
- 239000004568 cement Substances 0.000 description 14
- 239000001569 carbon dioxide Substances 0.000 description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 description 10
- 238000007710 freezing Methods 0.000 description 9
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 6
- 238000005303 weighing Methods 0.000 description 5
- 230000008014 freezing Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 230000001351 cycling effect Effects 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000010423 industrial mineral Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000007655 standard test method Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 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
-
- 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
- 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
Abstract
The invention belongs to the technical field of building materials, and discloses a green carbon-reducing concrete admixture, green carbon-reducing concrete and a preparation method thereof. When the admixture prepared by using the double-doped water reducing agent and the expanding agent as main materials and using the graphene oxide, the air entraining agent and the natural fibers as auxiliary materials is applied to concrete, the antifreezing property of the concrete can be obviously improved, the mechanical property of the concrete can be fully ensured, and the toughness of the concrete can be improved.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a green carbon-reducing concrete admixture, green carbon-reducing concrete and a preparation method thereof.
Background
Carbon dioxide is inevitably generated in the cement production process, and the emission of the carbon dioxide in the cement production process can be divided into direct emission and indirect emission according to different stages of the generation of the carbon dioxide, wherein the direct emission refers to the emission of the carbon dioxide generated by the decomposition of calcium carbonate in the cement production process, and the indirect emission refers to the carbon dioxide generated by the combustion of cement kiln fuel in the cement production process, the carbon dioxide generated by electricity consumption and other stages. Statistically, a total of about 0.8 tons of carbon dioxide are emitted, both direct and indirect, per ton of cement produced. Therefore, the cement industry is a genuine big house of carbon emissions.
The low-carbon concrete is characterized in that a large amount of industrial waste such as steel slag, fly ash of a power plant or mine tailings which is used due to low cement consumption is pretreated to react with carbon dioxide to form a carbonate material, and the carbonate material is precipitated in pores, so that the industrial waste has higher density and strength and lower water absorption and crushing indexes, and can be used as a proper ingredient of concrete after the performance of the industrial waste is improved, and the low-carbon concrete has the characteristic of low carbon due to low cement consumption.
The area of the plateau in China is very wide, after the economic strength of the country is improved, the country focuses more and more on the western alpine region, in order to effectively solve the traffic problem of the western alpine region, the country starts to build western traffic transportation infrastructures, the alpine region has extremely severe weather conditions relative to other regions, the plateau alpine region is often low in average temperature, large in day and night temperature difference, frequent in freeze thawing, the internal structure of a concrete building is damaged, the strength loss is large, the freezing resistance is poor, and in addition, the mass concrete formed at one time is difficult to maintain in the later period.
Therefore, aiming at the problems that the durability of large-volume concrete formed in one step in a plateau alpine region is poor, and common concrete cannot be suitable for the climate of the plateau alpine region, the green carbon-reducing concrete is developed, has good frost resistance, reduces the using amount of cement while ensuring the strength of the concrete, and has very good environmental significance in the modern society with harsh carbon targets.
Disclosure of Invention
In view of the above, the invention provides a green carbon-reducing concrete admixture and green carbon-reducing concrete, the green carbon-reducing concrete added with the green carbon-reducing concrete admixture further improves the frost resistance of the concrete while ensuring the strength, reduces the dosage of cement and indirectly reduces the emission of carbon dioxide.
In order to achieve the purpose, the invention adopts the following technical scheme:
the green carbon-reducing concrete admixture is composed of the following raw materials in parts by weight: :3-5 parts of sodium lignosulfonate grafting polycarboxylic acid water reducing agent, 3-5 parts of double-doped expanding agent, 0.01-0.05 part of air entraining agent and 0.1-0.5 part of natural fiber.
Preferably, the double-doped expanding agent is formed by mixing a magnesium oxide type expanding agent and a calcium sulphoaluminate-calcium oxide type expanding agent according to the weight ratio of 1.
Preferably, 0.01-0.06 part of graphene oxide is further included by weight.
Preferably, the air entraining agent is sodium lauryl sulfate.
Preferably, the natural fiber is sisal fiber.
The green carbon-reducing concrete comprises the green carbon-reducing concrete admixture and consists of the following raw materials in parts by mass: 20-30 parts of ordinary portland cement, 15-40 parts of ultrafine fly ash, 30-60 parts of ground steel slag powder, 30-60 parts of ground slag powder, 300-500 parts of crushed waste ceramic, 300-500 parts of crushed stone, 25-30 parts of waste tire rubber powder, 500-600 parts of sand, 25-48 parts of green carbon-reducing concrete admixture and 70-231 parts of water.
Preferably, the ultrafine fly ash is I-grade fly ash, and the specific surface area is more than or equal to 7000cm 2 /g。
Preferably, the grades of the ground steel slag powder and the ground slag powder are S95 grade or above, and the specific surface areas are more than or equal to 4000cm 2 /g。
Preferably, the sand has a particle size in the range of 5 to 20mm.
The preparation method of the green carbon-reducing concrete comprises the following steps: mixing the green carbon-reduced concrete additive, the ordinary portland cement, the ultrafine fly ash and water in a specific weight part, placing the mixture into a stirrer for stirring uniformly for 30-40s, and then adding the fine steel slag powder, the fine slag powder, the crushed waste ceramic, the crushed stone, the waste tire rubber powder and the sand for stirring for 150-180s to obtain the carbon-reduced concrete additive.
According to the technical scheme, compared with the prior art, when the admixture prepared by using the double-doped water reducing agent and the expanding agent as the main materials and the graphene oxide, the air entraining agent and the natural fibers as the auxiliary materials is applied to the concrete, the frost resistance of the concrete can be obviously improved, the mechanical property of the concrete can be fully ensured, and the toughness of the concrete can be improved, so that the technical problems that the concrete is high in brittleness and easy to crack in plateau alpine regions due to climatic reasons, and particularly the integrally formed concrete is difficult to maintain after cracking are solved.
2. Besides the addition of the green carbon-reducing admixture prepared by the invention, the waste industrial mineral powder such as slag, steel slag and the like is used for replacing cement when the concrete is prepared by the invention, so that the consumption of the cement is reduced, the emission of carbon dioxide is indirectly reduced, and the green carbon-reducing admixture has good social value and economic value.
3. The concrete anti-freezing agent is characterized in that a water reducing agent and an expanding agent are mutually blended to serve as an additive of concrete, the water reducing agent can fully play a role in reducing the using amount of concrete mixing water, the expanding agent can fully play a role in reducing the internal structure gap of the concrete and limiting the inflow of external water, meanwhile, graphene oxide is added in the scheme of the concrete anti-freezing agent, after the graphene oxide is added, on one hand, the surface of the graphene oxide has abundant hydroxyl groups and functional groups, reaction points can be provided for hydration reaction after the graphene oxide is introduced into the concrete, the progress of the hydration reaction is accelerated, the structure is refined, the combination between mortar and aggregate of the concrete is ensured to be more sufficient, the pores after the expanding agent is acted are further reduced, the structure becomes more compact, the anti-freezing degree of the concrete is improved, the mechanical property of the concrete is improved, the compactness of the concrete is increased due to the addition of the graphene oxide, the water absorption amount in the pores is reduced, and the mass loss rate is small after the freeze-freezing cycle occurs, and the freezing performance is further enhanced.
4. According to the invention, waste industrial mineral powder is used for replacing cement, and when the coarse aggregate is selected, a part of waste ceramic is used for replacing natural broken stone, so that excessive loss of natural resources is reduced, the waste resources are recycled, and on the other hand, the splitting tensile strength of concrete can be obviously improved and cracking of concrete is reduced when the waste ceramic is used as the coarse aggregate.
5. Different from the prior art, the technical scheme of the invention is that natural fibers (sisal fibers) are added. When the concrete is prepared, the gelling material and the sisal fibers are firstly uniformly mixed, so that the sisal fibers are uniformly wrapped by the gelling material, and then are mixed with other raw materials such as aggregate, so that the sisal fibers are uniformly dispersed in the concrete instead of being agglomerated, when a concrete building meets section stress, mortar particles are uniformly and fully stressed together, the concrete sisal fibers can further deeply fill pores in the concrete, the defect of porosity of coarse aggregate waste ceramic can be effectively overcome, cracks existing on the surface can also reduce the speed and the probability of extending to the periphery under the action of the sisal fibers due to the action of the sisal fibers, a certain constraint effect on the deformation and crack generation of the concrete is achieved to a certain extent, the deformation resistance performance of the concrete is enhanced, and the concrete has certain toughness while the strength of the concrete is ensured. Therefore, the addition of the sisal fibers can effectively solve the technical problems of high brittleness, easy crack and difficult maintenance of integrally formed large-area concrete in plateau alpine regions.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment 1 of the invention discloses a green carbon-reducing concrete admixture which is prepared by the following steps:
1) Weighing the following raw materials in parts by weight: 3 parts of sodium lignosulfonate grafted polycarboxylic acid water reducing agent, 5 parts of double-doped expanding agent, 0.01 part of graphene oxide, 0.01 part of sodium dodecyl sulfate and 0.1 part of sisal fiber; the double-doped expanding agent is formed by mixing a magnesium oxide type expanding agent and a calcium sulphoaluminate-calcium oxide type expanding agent according to the weight ratio of 1;
2) Pouring the weighed components into a stirrer, and stirring for 5min to obtain the product.
The green carbon-reducing concrete containing the green carbon-reducing concrete additive prepared in the example 1 comprises, by weight, 20 parts of ordinary portland cement, 15 parts of ultrafine fly ash, 30 parts of ground steel slag powder, 60 parts of ground slag powder, 300 parts of crushed waste ceramic, 500 parts of crushed stone, 25 parts of waste tire rubber powder, 500 parts of sand, 25 parts of green carbon-reducing concrete additive and 70 parts of water; the ultrafine fly ash is I-grade fly ash, and the specific surface area is more than or equal to 7000cm 2 (ii)/g; the grade of the ground steel slag powder and the grade of the ground slag powder are S95 grade or above, and the specific surface area is more than or equal to 4000cm 2 (ii)/g; the sand has a particle size range of 5mm.
The preparation method of the green carbon-reduced concrete in the embodiment 1 comprises the following steps: mixing a specific weight part of green carbon-reduced concrete additive, ordinary portland cement, ultrafine fly ash and water, placing the mixture in a stirrer for 30s, uniformly stirring, adding fine steel slag powder, fine slag powder, crushed waste ceramic, crushed stone, waste tire rubber powder and sand, and stirring for 150s to obtain the concrete;
the embodiment 2 of the invention discloses a green carbon-reducing concrete admixture which is prepared by the following steps:
1) Weighing the following raw materials in parts by weight: 5 parts of sodium lignosulfonate grafted polycarboxylic acid water reducing agent, 3 parts of double-doped expanding agent, 0.06 part of graphene oxide, 0.05 part of sodium dodecyl sulfate and 0.5 part of sisal fiber; the double-doped expanding agent is formed by mixing a magnesium oxide type expanding agent and a calcium sulphoaluminate-calcium oxide type expanding agent according to the weight ratio of 1;
2) Pouring the weighed components into a stirrer, and stirring for 10min to obtain the product.
The green carbon-reducing concrete containing the green carbon-reducing concrete additive prepared in the embodiment 2 comprises, by weight, 30 parts of ordinary portland cement, 40 parts of ultrafine fly ash, 60 parts of ground steel slag powder, 30 parts of ground slag powder, 500 parts of crushed waste ceramic, 300 parts of crushed stone, 30 parts of waste tire rubber powder, 600 parts of sand, 48 parts of the green carbon-reducing concrete additive and 231 parts of water; the ultrafine fly ash isClass I fly ash with specific surface area of 7000cm or more 2 (iv) g; the grade of the ground steel slag powder and the grade of the ground slag powder are S95 grade or above, and the specific surface area is more than or equal to 4000cm 2 (ii)/g; the sand has a particle size range of 20mm;
the preparation method of the green carbon-reduced concrete of the embodiment 2 comprises the following steps: mixing the green carbon-reduced concrete additive, the ordinary portland cement, the ultrafine fly ash and water in specific parts by weight, putting the mixture into a stirrer, uniformly stirring the mixture for 40s, adding the ground steel slag powder, the ground slag powder, the crushed waste ceramic, the crushed stone, the waste tire rubber powder and the sand, and stirring the mixture for 180s to obtain the carbon-reduced concrete additive.
The embodiment 3 of the invention discloses a green carbon-reducing concrete admixture which is prepared by the following steps:
1) Weighing the following raw materials in parts by weight: 4 parts of sodium lignosulfonate grafted polycarboxylic acid water reducing agent, 4 parts of double-doped expanding agent, 0.05 part of graphene oxide, 0.03 part of sodium dodecyl sulfate and 0.3 part of sisal fiber; the double-doped expanding agent is formed by mixing a magnesium oxide type expanding agent and a calcium sulphoaluminate-calcium oxide type expanding agent according to the weight ratio of 1;
2) Pouring the weighed components into a stirrer, and stirring for 8min to obtain the product.
The green carbon-reduced concrete containing the green carbon-reduced concrete additive prepared in the embodiment 3 comprises, by weight, 25 parts of ordinary portland cement, 35 parts of ultrafine fly ash, 45 parts of ground steel slag powder, 45 parts of ground slag powder, 400 parts of crushed waste ceramic, 400 parts of crushed stone, 28 parts of waste tire rubber powder, 550 parts of sand, 36 parts of green carbon-reduced concrete additive and 180 parts of water; the ultrafine fly ash is I-grade fly ash, and the specific surface area is more than or equal to 7000cm 2 (ii)/g; the grade of the ground steel slag powder and the grade of the ground slag powder are S95 grade or above, and the specific surface area is more than or equal to 4000cm 2 (ii)/g; the sand has a particle size in the range of 15mm.
The preparation method of the green carbon-reduced concrete in the embodiment 3 comprises the following steps: mixing the green carbon-reduced concrete additive, the ordinary portland cement, the ultrafine fly ash and water in specific parts by weight, placing the mixture in a stirrer for 35s, uniformly stirring, adding the ground steel slag powder, the ground slag powder, the crushed waste ceramic, the crushed stone, the waste tire rubber powder and the sand, and stirring for 170s to obtain the carbon-reduced concrete additive.
Comparative example 1
A premixed concrete is prepared by mixing 25 parts of ordinary portland cement, 35 parts of ultrafine fly ash, 45 parts of ground steel slag powder, 45 parts of ground slag powder, 400 parts of crushed waste ceramic, 400 parts of crushed stone, 150 parts of waste tire rubber powder, 550 parts of sand and 180 parts of water and then uniformly stirring.
Comparative example 2
A premixed concrete is prepared by mixing 25 parts of ordinary portland cement, 35 parts of ultrafine fly ash, 45 parts of ground steel slag powder, 45 parts of ground slag powder, 400 parts of crushed waste ceramic, 400 parts of crushed stone, 578 parts of sand, 36 parts of green carbon-reducing concrete admixture and 180 parts of water and then uniformly stirring.
Comparative example 3
A premixed concrete is prepared by mixing 25 parts of ordinary portland cement, 35 parts of ultrafine fly ash, 45 parts of ground steel slag powder, 45 parts of ground slag powder, 400 parts of crushed waste ceramic, 400 parts of crushed stone, 28 parts of waste tire rubber powder, 550 parts of sand, 36 parts of green carbon-reducing concrete admixture and 180 parts of water and then uniformly stirring; the green carbon-reducing concrete admixture is prepared by the following steps:
1) Weighing the following raw materials in parts by weight: 3 parts of sodium lignosulfonate grafted polycarboxylic acid water reducing agent, 5 parts of double-doped expanding agent, 0.05 part of graphene oxide, 0.03 part of sodium dodecyl sulfate and 0.3 part of sisal fiber; the double-doped expanding agent is formed by mixing a magnesium oxide type expanding agent and a calcium sulphoaluminate-calcium oxide type expanding agent according to the weight ratio of 1;
2) Pouring the weighed components into a stirrer, and stirring for 8min to obtain the product.
Comparative example 4
A premixed concrete is prepared by mixing 25 parts of ordinary portland cement, 35 parts of ultrafine fly ash, 45 parts of ground steel slag powder, 45 parts of ground slag powder, 400 parts of crushed waste ceramic, 400 parts of crushed stone, 28 parts of waste tire rubber powder, 550 parts of sand, 36 parts of green carbon-reducing concrete admixture and 180 parts of water and then uniformly stirring; the green carbon-reducing concrete admixture is prepared by the following steps:
1) Weighing the following raw materials in parts by weight: 5 parts of sodium lignosulfonate grafted polycarboxylic acid water reducing agent, 3 parts of double-doped expanding agent, 0.05 part of graphene oxide, 0.03 part of sodium dodecyl sulfate and 0.3 part of sisal fiber; the double-doped expanding agent is formed by mixing a magnesium oxide type expanding agent and a calcium sulphoaluminate-calcium oxide type expanding agent according to the weight ratio of 1;
2) Pouring the weighed components into a stirrer, and stirring for 8min to obtain the product.
Test example 1
Reference is made to GB/T50080-2016 Standard test method for Performance of common concrete mixtures; GB/T50081-2019 'test method Standard for physical and mechanical Properties of concrete' is carried out, and the concrete wear resistance is tested: the concrete prepared in examples 1 to 3 was tested for its properties according to JC/T421-2004 "Cement mortar abrasion resistance test method", and the test results are shown in Table 1.
TABLE 1 test results for examples 1-3
Test example 2
The concrete prepared in comparative example 1 and example 3 was tested for frost resistance in accordance with GB/T50082 Standard test methods for Long-term Properties and durability of ordinary concrete. The test results are shown in Table 2
Table 2-freeze-thaw cycle test results of comparative example 1 and example 3
After the freeze-thaw cycle is performed for 100 times, the compressive strength is continuously reduced, as can be seen from data in table 2, the compressive strength of the concrete prepared in example 3 doped with the admixture is reduced from 68.3MPa to 49.4MPa and reduced by 18.9MPa, and the compressive strength of the concrete prepared in comparative example 1 not doped with the admixture is reduced from 47.9MPa to 15.7MPa and reduced by 32.2MPa, so that the anti-freezing performance of the concrete can be remarkably improved by using the concrete admixture prepared in the invention.
Test example 3
The concrete of the comparative example 3, the comparative example 4 and the example 3 is subjected to compression strength and frost resistance tests, and the frost resistance test standard is subjected to concrete frost resistance test by adopting a slow freezing method according to the standard requirement of the test method standard of the long-term performance and durability of common concrete (GB/T50082-2009); the compression strength test is carried out according to the standard of the test method of the mechanical property of common concrete (GB/T50081-2016); the test results are shown in Table 4.
Table 3-comparative example 3, comparative example 4 and example 3 test results
| Group of | Compressive strength MPa | Percent mass loss (freezing and thawing cycle 60 times) |
| Example 3 | 68.3 | 1.92％ |
| Comparative example 3 | 57.9 | 2.13％ |
| Comparative example 4 | 57.4 | 2.15％ |
As can be seen from the data in Table 3, the concrete prepared in example 3, comparative example 3 and comparative example 4 has certain mass loss after freeze-thaw cycling, the mass loss rate of the concrete prepared in example 3 of the invention after freeze-thaw cycling is at least 1.92%, and the mass loss rate of the concrete prepared in comparative example 3 and comparative example 4 after freeze-thaw cycling is at least 2,13% and 2.15, which are obviously increased.
And 3 parts of sodium lignosulfonate grafted polycarboxylic acid water reducing agent and 5 parts of double-doped expanding agent are added in the comparative example 3, the adding amount of the expanding agent is obviously excessive, so that the inflow of external water can be increased due to redundant gaps formed in the internal structure of the concrete, and the frost resistance of the concrete is reduced on the contrary, 5 parts of sodium lignosulfonate grafted polycarboxylic acid water reducing agent and 3 parts of double-doped expanding agent are added in the comparative example 4, and the water reducing agent is obviously excessive, so that redundant gaps can be formed in the internal structure of the concrete, the compressive strength of the concrete is reduced, and the frost resistance is reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The green carbon-reducing concrete additive is characterized in that: the composite material is prepared from the following raw materials in parts by mass: 3-5 parts of sodium lignosulfonate grafted polycarboxylic acid water reducing agent, 3-5 parts of double-doped expanding agent, 0.01-0.05 part of air entraining agent and 0.1-0.5 part of natural fiber.
2. The green carbon-reducing concrete admixture according to claim 1, wherein: the double-doped expanding agent is formed by mixing a magnesium oxide type expanding agent and a calcium sulphoaluminate-calcium oxide type expanding agent according to the weight ratio of 1.
3. The green carbon-reducing concrete admixture according to claim 1, wherein: 0.01-0.06 part of graphene oxide.
4. The green carbon-reducing concrete admixture according to claim 1, wherein: the natural fiber is sisal fiber.
5. The green carbon-reducing concrete admixture according to claim 1, wherein: the air entraining agent is sodium dodecyl sulfate.
6. The green carbon-reducing concrete is characterized in that: the green carbon-reducing concrete admixture of any one of claims 1 to 5.
7. The green carbon-reducing concrete according to claim 6, wherein: the composite material is prepared from the following raw materials in parts by mass: 20-30 parts of ordinary portland cement, 15-40 parts of ultrafine fly ash, 30-60 parts of ground steel slag powder, 30-60 parts of ground slag powder, 300-500 parts of crushed waste ceramic, 300-500 parts of crushed stone, 25-30 parts of waste tire rubber powder, 500-600 parts of sand, 25-48 parts of green carbon-reducing concrete admixture and 70-231 parts of water.
8. The green carbon-reducing concrete according to claim 7, wherein: the ultrafine fly ash is I-grade fly ash, and the specific surface area is more than or equal to 7000cm < 2 >/g; the grade of the ground steel slag powder and the grade of the ground slag powder are both S95 grade or above, and the specific surface area is more than or equal to 4000cm < 2 >/g; the sand has a particle size range of 5-20mm.
9. The preparation method of the green carbon-reduced concrete of any one of claims 7 to 8 comprises the following specific steps: mixing the green carbon-reduced concrete additive, the ordinary portland cement, the ultrafine fly ash and water in specific parts by weight, placing the mixture in a stirrer for 30-40s, uniformly stirring, adding the ground fine steel slag powder, the ground slag powder, the crushed waste ceramic, the crushed stone, the waste tire rubber powder and the sand, and stirring for 150-180s to obtain the carbon-reduced concrete additive.
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Cited By (1)
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| CN115432971A (en) * | 2022-09-21 | 2022-12-06 | 陕西红旗汇石建筑制品有限公司 | High-strength anti-permeability composite concrete and preparation method thereof |
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| CN108164183A (en) * | 2018-03-22 | 2018-06-15 | 合肥雅克丽新型建材有限公司 | A kind of high efficiency water reducing agent of construction material and preparation method thereof |
| CN108529961A (en) * | 2018-03-30 | 2018-09-14 | 广西交通规划勘察设计研究院有限公司 | A kind of green high performance concrete material and preparation method thereof |
| CN114057438A (en) * | 2021-11-11 | 2022-02-18 | 湖州鸿鼎混凝土制品有限公司 | Low-alkali compression-resistant fracture-resistant green environment-friendly concrete and preparation method thereof |
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| CN108529961A (en) * | 2018-03-30 | 2018-09-14 | 广西交通规划勘察设计研究院有限公司 | A kind of green high performance concrete material and preparation method thereof |
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Application publication date: 20221129 |