CN113321457A - Method for preparing ultra-high performance concrete by doping oyster shell powder and metakaolin - Google Patents
Method for preparing ultra-high performance concrete by doping oyster shell powder and metakaolin Download PDFInfo
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- CN113321457A CN113321457A CN202110724052.3A CN202110724052A CN113321457A CN 113321457 A CN113321457 A CN 113321457A CN 202110724052 A CN202110724052 A CN 202110724052A CN 113321457 A CN113321457 A CN 113321457A
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- oyster shell
- shell powder
- metakaolin
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- performance concrete
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B14/10—Clay
- C04B14/106—Kaolin
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
- C04B20/008—Micro- or nanosized fillers, e.g. micronised fillers with particle size smaller than that of the hydraulic binder
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for preparing ultra-high performance concrete by doping oyster shell powder and metakaolin, which comprises the steps of cleaning, crushing and grinding recycled oyster shells, doping the oyster shell powder and the metakaolin, replacing cement according to a certain proportion, mixing the cement with silica fume, water and river sand according to the proportion, and mixing the cement: silica fume: metakaolin: fresh oyster shell powder: river sand: water: water reducing agent: steel fiber = 1: 0.29-0.53: 0.14 to 0.26: 0.21-0.84: 1.43-2.63: 0.26 to 0.47: 0.03-0.05: 0.34-0.62, and preparing the ultra-high performance concrete with the performance meeting the requirement. The invention can improve the recycling rate of oyster shells, reduce the discharge of kitchen garbage and protect the environment.
Description
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a method for preparing ultra-high performance concrete by doping oyster shell powder and metakaolin.
Background
The ultra-high performance concrete has excellent strength, toughness and durability, and the compressive strength and the toughness of the ultra-high performance concrete are 3 times and 300 times of those of the traditional concrete. However, the elastic modulus of the ultra-high performance concrete is only increased by about 1.5 times, which limits the application of the ultra-high performance concrete in practical engineering. According to food and agriculture organization data of the united nations, the seafood consumption of everyone in China is increased from 11.5 kg in 1990 to 36 kg in 2020, a large amount of kitchen waste such as fresh oyster shells, fishbones, shells and the like is generated, and the kitchen waste is often sent to a refuse dump for landfill, so that the environment is polluted.
Aiming at the problems, the oyster shell is recycled to replace a part of cement, and the problems can be solved. The oyster shell powder is used in the ultra-high performance concrete, so that the emission of kitchen garbage can be reduced, the environment is protected, and the working performance and the elastic modulus of the ultra-high performance concrete can be improved.
Disclosure of Invention
The invention aims to provide a method for preparing ultra-high performance concrete by doping oyster shell powder and metakaolin, which can consume a large amount of oyster shells and increase the recycling rate of the oyster shells, thereby effectively improving the current situation that the recycling rate of the existing oyster shells is not high.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing ultra-high performance concrete by doping oyster shell powder and metakaolin comprises the following steps:
(1) recycling the fresh oyster shell;
(2) cleaning, crushing and grinding the recycled oyster shell to obtain oyster shell powder (the specific surface area is 650 m)2Per kg, the particle size range is less than 30 mu m, the average particle size is 20 mu m), and the grinding time is 1.5-2.5 hours;
(3) mixing oyster shell powder and metakaolin, replacing cement according to a certain proportion, and mixing the mixture with silica fume, water and river sand according to a certain proportion, wherein the cement: silica fume: metakaolin: fresh oyster shell powder: river sand: water: water reducing agent: steel fiber = 1: 0.29-0.53: 0.14 to 0.26: 0.21-0.84: 1.43-2.63: 0.26 to 0.47: 0.03-0.05: 0.34 to 0.62;
(4) and (4) stirring, casting, vibrating, demolding and maintaining the mixture obtained in the step (3) to prepare the ultra-high performance concrete with the performance meeting the requirement.
The invention has the following remarkable advantages:
(1) according to the invention, the oyster shell powder is prepared into the ultra-high performance concrete, so that the resource utilization of the oyster shell can be realized, the kitchen garbage discharge amount is reduced, and the environment is protected. By controlling the grinding system, the performance of the ultra-high performance concrete prepared from the oyster shell powder is stable.
(2) According to the invention, the oyster shell powder and the metakaolin are mixed to be used as a gel material, and the oyster shell powder is used for preparing the ultra-high performance concrete by controlling the grinding system and the scientific design mix proportion of the oyster shell powder, so that the working performance and the elastic modulus of the ultra-high performance concrete are improved.
(3) The specific surface area of the ground oyster shell powder adopted by the invention is 650m2The oyster shell powder with small particle size can chemically react with metakaolin to improve the elastic modulus of concrete, and when the average particle size of the oyster shell powder exceeds 30 microns, the chemical reaction rate and speed can be obviously reduced, and the oyster shell powder can serve as aggregate in the concrete to play a role in physical stacking of a framework.
Detailed Description
A method for preparing ultra-high performance concrete by doping oyster shell powder and metakaolin comprises the following steps:
(1) recycling the fresh oyster shell;
(2) cleaning, crushing and grinding the recycled oyster shell to obtain oyster shell powder (the specific surface area is 650 m)2Per kg, the average grain diameter is 20 mu m), and the grinding time is 2 hours;
(3) mixing oyster shell powder and metakaolin, replacing cement according to a certain proportion, and mixing the mixture with silica fume, water and river sand according to a certain proportion, wherein the cement: silica fume: metakaolin: fresh oyster shell powder: river sand: water: water reducing agent: steel fiber =380~ 700: 200: 100: 0-320: 1000: 180: 20: 235 parts by weight are mixed;
(4) and (4) stirring, casting, vibrating, demolding and maintaining the mixture obtained in the step (3), and testing the working performance, strength and elastic modulus of the ultra-high performance concrete.
In order to make the present invention more comprehensible, the technical solutions of the present invention are further described below with reference to specific embodiments, but the present invention is not limited thereto.
Examples
(1) Recycling the fresh oyster shell;
(2) cleaning, crushing and grinding the recycled oyster shells for 2 hours;
(3) the chemical components and physical properties of the fresh oyster shell powder are tested, and the results are shown in tables 1 and 2;
TABLE 1 chemical composition of fresh oyster Shell powder (%)
TABLE 2 physical Properties of fresh oyster Shell powder
(4) Mixing oyster shell powder and metakaolin, replacing cement according to a certain proportion, and mixing the mixture with silica fume, water and river sand according to a certain proportion, wherein the cement: silica fume: metakaolin: fresh oyster shell powder: river sand: water: water reducing agent: steel fiber =380~ 700: 200: 100: 0-320: 1000: 180: 20: 235 parts by weight of a mixture, see table 3;
TABLE 3 blending ratio of ultra high Performance concrete
(5) And (3) carrying out stirring, vibration molding, demolding and curing on the mixture obtained in the step (4), and testing the fluidity, the compressive strength and the elastic modulus of the ultra-high performance concrete under different mixing ratios according to a cement mortar fluidity testing method (GB/T2419-.
TABLE 4 Properties of ultra high Performance concrete at different mix ratios
As can be seen from Table 4, with the increase of the substitution rate of oyster shell powder, the fluidity and compressive strength of the ultra-high performance concrete are increased and then reduced, the elastic modulus is increased continuously, when the oyster shell powder accounts for 16% of the cementing material, the comprehensive performance of the ultra-high performance concrete is optimal, and the elastic modulus of the ultra-high performance concrete is improved. On one hand, the fresh oyster shell has high elastic modulus which can reach 80GPa, and the elastic modulus of the fresh oyster shell is hopeful to be improved after cement is replaced. On the other hand, oyster shell powder can significantly increase the reactivity when ground to below 80 μm in an alkaline environment, and reacts with alumina in metakaolin to form hydration product calcium aluminum carbonate, as shown in chemical reaction equation (1). Compared with the pores (the elastic modulus is 0), the formation of the calcium aluminum carbonate not only fills the pores in the ultrahigh-performance concrete, but also has higher elastic modulus (the elastic modulus is 25GPa) and further improves the elastic modulus of the ultrahigh-performance concrete. The influence of the fresh oyster shell powder on the performance of the concrete is comprehensively considered, and the substitution rate of the fresh oyster shell powder is recommended to be 16%.
The raw materials and the mixing ratio of the comparative example 1 and the comparative example 2 are the same as those of the example 2 (see the example 2 in the table 3 for details) by using the example 2 as a comparison sample, and the specific surface areas of the raw materials and the mixing ratio are 350 and 500m2The specific surface area of the substituted oyster shell powder is 650 m/kg2The influence of oyster shell powder with different specific surface areas (particle sizes) on the performance of the ultrahigh-performance concrete is tested, and the results are shown in table 5. The specific surface area is 650m2The particle size range of the oyster shell powder per kg is less than 30 mu m, and the average particle size is 20 mu m; the specific surface area is 500m2Perkg of oyster shell powder granulesThe diameter range is 30-60 mu m, and the average grain diameter is 40 mu m; the specific surface area is 300m2The particle size range of the oyster shell powder per kg is 60-100 mu m, and the average particle size is 80 mu m. As can be seen from Table 5, as the specific surface area of oyster shell powder is decreased (particle size is increased), the fluidity of the ultra-high performance concrete is increased, and the compressive strength and the elastic modulus are decreased. The reason is that the water demand is reduced along with the increase of the particle size of the oyster shell powder, and the fluidity of the ultra-high performance concrete can be improved. In addition, with the increase of the particle size of the oyster shell powder, the solubility of the oyster shell powder in a pore solution is obviously reduced, so that the reaction activity of the oyster shell powder is greatly reduced, the content of generated calcium aluminum carbonate is obviously reduced, and the strength and the elastic modulus of the ultrahigh-performance concrete are reduced.
TABLE 5 Properties of ultra-high Performance concrete with limestone powders of different specific surface areas
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (4)
1. A method for preparing ultra-high performance concrete by doping oyster shell powder and metakaolin is characterized in that: the method comprises the following steps:
(1) recycling the fresh oyster shell;
(2) cleaning, crushing and grinding the recycled oyster shell to obtain oyster shell powder;
(3) replacing cement with oyster shell powder according to a certain proportion, and mixing the oyster shell powder with the cement, silica fume, metakaolin, river sand, water, a water reducing agent and steel fibers according to a certain proportion;
(4) and (4) preparing the mixture obtained in the step (3) into the ultra-high performance concrete.
2. The method of claim 1, wherein: and (3) grinding time in the step (2) is 1.5-2.5 hours.
3. The method of claim 1, wherein: cement in the step (3) according to the mass ratio: silica fume: metakaolin: fresh oyster shell powder: river sand: water: water reducing agent: steel fiber = 1: 0.29-0.53: 0.14 to 0.26: 0.21-0.84: 1.43-2.63: 0.26 to 0.47: 0.03-0.05: 0.34 to 0.62.
4. The method of claim 1, wherein: the specific surface area of the fresh oyster shell powder is 650m2Per kg, the average particle diameter was 20 μm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116332589A (en) * | 2023-02-06 | 2023-06-27 | 中铁十五局集团有限公司 | Environment-friendly low-temperature-resistant anti-cracking concrete and preparation method thereof |
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| JP2007015894A (en) * | 2005-07-08 | 2007-01-25 | Jdc Corp | Concrete containing crushed shell material |
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| CN109020456A (en) * | 2018-08-25 | 2018-12-18 | 北京建工新型建材有限责任公司 | A kind of Machine-made Sand dry-mixed mortar and preparation method thereof |
| CN109836097A (en) * | 2019-02-27 | 2019-06-04 | 湖南大学 | A kind of ecotype ultra-high performance concrete |
| CN111233411A (en) * | 2020-03-27 | 2020-06-05 | 福州大学 | High-toughness and ultra-high-performance concrete doped with metakaolin and magnesium oxide and preparation method thereof |
-
2021
- 2021-06-29 CN CN202110724052.3A patent/CN113321457B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007015894A (en) * | 2005-07-08 | 2007-01-25 | Jdc Corp | Concrete containing crushed shell material |
| CN104072002A (en) * | 2014-07-09 | 2014-10-01 | 广西经正科技开发有限责任公司 | Composite clay substituting natural sand and premixed concrete adopting composite clay as raw material |
| CN109020456A (en) * | 2018-08-25 | 2018-12-18 | 北京建工新型建材有限责任公司 | A kind of Machine-made Sand dry-mixed mortar and preparation method thereof |
| CN109836097A (en) * | 2019-02-27 | 2019-06-04 | 湖南大学 | A kind of ecotype ultra-high performance concrete |
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Non-Patent Citations (1)
| Title |
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| 李海艳: "《纳米技术改性水泥基材料》", 31 October 2019, pages: 9 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116332589A (en) * | 2023-02-06 | 2023-06-27 | 中铁十五局集团有限公司 | Environment-friendly low-temperature-resistant anti-cracking concrete and preparation method thereof |
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