CN112194400B - Core-shell structure lightweight aggregate prepared by cold bonding method and preparation method thereof - Google Patents
Core-shell structure lightweight aggregate prepared by cold bonding method and preparation method thereof Download PDFInfo
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- CN112194400B CN112194400B CN202011299624.XA CN202011299624A CN112194400B CN 112194400 B CN112194400 B CN 112194400B CN 202011299624 A CN202011299624 A CN 202011299624A CN 112194400 B CN112194400 B CN 112194400B
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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
- 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
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
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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
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
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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
- 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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
Abstract
The invention discloses a core-shell structure lightweight aggregate prepared by a cold bonding method and a preparation method thereof, wherein the method comprises the following steps: preparing common Portland cement, calcined clay, limestone powder and gypsum into a calcined clay-based green environment-friendly cementing material in proportion; putting the core material particles into a light aggregate granulation device, then putting a calcined clay-based green environment-friendly cementing material, and uniformly spraying a mixing agent for granulation to form primary cold-bonded aggregate; maintaining the primary cold-bonded aggregate for the first time, soaking the primary cold-bonded aggregate in a solution containing organic acid or phenol compounds, taking out the primary cold-bonded aggregate and drying the primary cold-bonded aggregate, and then repeatedly spraying a calcium hydroxide aqueous solution on the surface of the primary cold-bonded aggregate to form the aggregate with super-hydrophobic surface; and continuously putting the aggregate with the super-hydrophobic surface into water for secondary maintenance to produce the super-hydrophobic high-strength lightweight aggregate. The invention relates to a core-shell structure lightweight aggregate which is energy-saving, low in consumption, simple in processing flow, low in water absorption and high in single bearing capacity, and can realize solid waste recycling, and a preparation method thereof.
Description
Technical Field
The invention relates to the technical field of aggregate preparation for buildings, in particular to a lightweight aggregate with a core-shell structure, which has the advantages of energy conservation, low consumption, simplified processing flow, capability of realizing solid waste recycling, low water absorption and high particle bearing capacity, and a preparation method thereof.
Background
The ceramsite is classified according to the preparation and production processes of the ceramsite and can be classified into sintered ceramsite, sintered ceramsite and non-sintered ceramsite. The traditional production process adopts clay, fly ash, limestone powder and other raw materials to produce the artificial lightweight aggregate by the high-temperature sintering technology of a rotary kiln. The production process technology belongs to a firing mode, the preparation process not only consumes a large amount of energy, but also discharges a large amount of toxic and harmful gases such as sulfur dioxide and the like into the air, the yield is low, the bearing capacity of a single aggregate is generally low, and the water absorption rate is high.
In recent years, both China and other countries have vigorously popularized low-carbon and environmental protection policies for energy conservation, in order to respond to the environmental protection policies, the use of natural resources such as clay and shale is reduced, and the aim of 'non-waste cities' is achieved by vigorously popularizing construction wastes, solid wastes, river sediment and the like as resources. In the production process, a cold-bonding granulation technology and a light-burned ceramsite technology are gradually popularized and used to replace a high-temperature sintering technology to produce the aggregates. The non-sintered haydite is one kind of artificial light aggregate produced with various kinds of active solid waste, cementing material, curing agent and other supplementary material and through pelletizing and natural curing. However, the existing baking-free lightweight aggregate has higher bulk density, lower cylinder compressive strength, poor heat preservation effect, more required raw materials and poor economic effect.
The prior art has the following defects:
1. the lightweight aggregate produced by the high-temperature sintering technology has the disadvantages of high energy consumption, poor production environment and laggard production process.
2. The existing baking-free ceramsite has low strength and low particle bearing capacity, is easy to carbonize, and is mainly applied to non-bearing structures such as small-sized building blocks, partition plates and the like.
3. The traditional ceramsite aggregate has high water absorption rate, usually 5-25%, and the fire resistance is not good due to overhigh water absorption rate, and concrete is easy to crack at high temperature.
4. Most of the existing non-sintered ceramsite is based on powder such as fly ash or slag, and the sustainability of raw material supply is not strong.
5. The existing ceramsite preparation raw materials excessively depend on and consume natural clay and shale resources, the proportion of the ceramsite prepared by taking tailings and solid wastes as auxiliary materials is small, the raw materials are not diversified, the structure is unreasonable, and the ceramsite preparation method has a great difference from green circular economy.
6. At present, in order to reduce the water absorption of ceramsite, a silane type hydrophobic agent is adopted by a common chemical method, but the type of hydrophobic agent is expensive, needs to be coated by machinery or manpower, and is time-consuming and cost-consuming.
7. The strength of the high-temperature sintered ceramsite is fixed because the ceramsite has no active material or the active material is excited to be complete, and the ceramsite does not develop any more, and the mechanical property of the ceramsite is deteriorated and the strength of the ceramsite is reduced along with the lapse of time.
Therefore, a core-shell structure lightweight aggregate which is energy-saving, low in consumption, simple in processing flow, capable of realizing solid waste recycling, low in water absorption and high in particle bearing capacity and a preparation method thereof are needed.
Disclosure of Invention
The invention aims to provide a core-shell structure lightweight aggregate which is energy-saving, low in consumption, simple in processing flow, low in water absorption and high in single bearing capacity, and can realize solid waste recycling, and a preparation method thereof.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the method for preparing the lightweight aggregate with the core-shell structure by the cold bonding method comprises the following steps: the method comprises the following steps:
(1) preparing a calcined clay-based green environment-friendly cementing material from ordinary portland cement, calcined clay, limestone powder and gypsum according to a proportion;
(2) putting core material particles into a light aggregate granulation device, then putting the calcined clay-based green environment-friendly cementing material prepared in the step (1), and uniformly spraying a mixing agent for granulation to form primary cold-bonded aggregate, wherein the mixing agent is formed by mixing water and a curing agent;
(3) performing primary curing on the primary cold-bonded aggregate formed in the step (2);
(4) placing the aggregate subjected to the first maintenance in the step (3) into a solution containing an organic acid or a phenol compound for soaking for 12 hours, taking out and airing, and then carrying out surface super-hydrophobic treatment to form a surface super-hydrophobic aggregate; the surface super-hydrophobic treatment is to spray calcium hydroxide water solution on the surface of the aggregate repeatedly and put the aggregate into a carbonization box for carbonization;
(5) and continuously putting the aggregate with the super-hydrophobic surface into water for secondary maintenance to produce the super-hydrophobic high-strength lightweight aggregate.
The core material particles are solid waste particles with light and obvious particle type characteristics, and comprise: expanded perlite particles, polystyrene foam particles, mining waste rocks, smelting waste residues, various coal gangues and furnace slag.
The light aggregate granulation device is a disc light aggregate granulation device, the inclination angle of the disc light aggregate granulation device is 40-75 degrees, and the rotating speed is 30-50 revolutions per minute.
In the step (2), the mixing agent is formed by mixing water and a curing agent.
In the step (3), the first curing is to cure the primary cold-bonded aggregate in an environment with the temperature of 20 +/-3 ℃ and the relative humidity of 70-95% for a period of time.
In the step (3), the primary cold-bonded aggregate is put into a sealed constant-temperature circulating curing box for curing for 12 hours, and the working temperature of the constant-temperature circulating curing box is as follows: the temperature was 90 ℃ and the relative humidity was 98%.
In order to achieve the above object, the present invention further provides the following technical solutions: the method for preparing the lightweight aggregate with the core-shell structure by the cold bonding method comprises the following steps: the core material particle and the shell material, the shell material cladding outside the core material particle, characterized in that, the shell material includes: ordinary portland cement, calcined clay, limestone powder and gypsum.
The housing material comprises: the ordinary portland cement, the calcined clay, the limestone powder and the gypsum are prepared according to the following mixture ratio:
ordinary portland cement: 40-50 parts;
calcining the clay: 20-30 parts of a solvent;
limestone powder: 10-15 parts;
gypsum: 1-5 parts.
And an organic acid layer or a phenol layer is coated outside the shell material, and the organic acid layer or the phenol layer is repeatedly sprayed with a calcium hydroxide aqueous solution and then put into a carbonization box for carbonization to form nano-scale microprotrusions.
The core material particles are solid waste particles with light and obvious particle type characteristics, and comprise: expanded perlite particles, polystyrene foam particles, mining waste rocks, smelting waste residues, various coal gangues and furnace slag.
Compared with the prior art, the core-shell structure lightweight aggregate prepared by the cold-bonding method has good compressive strength, low water absorption, good heat insulation performance and good hydrophobic performance. The lightweight aggregate concrete produced by the aggregate has good mechanical property and is applied to structural function integrated building members. The cold-bonding granulation technology is adopted, the process is simple and economic, and the light aggregate is easy to industrially prepare. Meanwhile, the prepared aggregate has high single particle bearing capacity, good particle shape, good heat insulation performance, low water absorption and good hydrophobic performance. The physical action process of the core-shell material and the liquid provides the condition of internal curing of the cementing material, promotes internal hydration reaction to form hydrated gel products (C-S-H) to fill the internal pores of the aggregate, and is beneficial to reducing and even eliminating capillary stress, thereby reducing the cracking and shrinkage risks of the aggregate.
The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.
Drawings
FIG. 1 is a flow chart of a method for preparing a core-shell structured lightweight aggregate by a cold-bonding method according to the present invention.
FIG. 2 is a schematic structural diagram of core-shell structured lightweight aggregate prepared by the cold-bonding method of the present invention.
FIG. 3 is a schematic diagram showing the principle of aggregate hydrophobicity.
FIG. 4 is a schematic diagram of a finished product of core-shell structured lightweight aggregate prepared by the cold-bonding method of the present invention.
FIG. 5 is a microscopic structure view of the core-shell structured lightweight aggregate prepared by the cold-bonding method under a scanning electron microscope.
Detailed Description
Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements. As described above, as shown in fig. 1, the method for preparing a core-shell structure lightweight aggregate by a cold-bonding method according to an embodiment of the present invention includes: the method comprises the following steps:
preparing materials of ordinary portland cement, calcined clay, limestone powder and gypsum according to a proportion, and dry-mixing the materials to form a calcined clay-based green environment-friendly cementing material; the green environment-friendly calcined clay-based cementing material is a shell material for preparing the core-shell structure lightweight aggregate by the cold bonding method. In this example, the dry-mixing of the materials into the calcined clay-based green and environmentally friendly cementitious material was achieved by a stirrer. The calcined clay-based green environment-friendly cementing material is characterized in that the cement consumption is greatly reduced, and the calcined clay-based green environment-friendly cementing material has the advantages of being green, low-carbon, environment-friendly, more compact in microstructure, better in impermeability and the like. The calcined clay-based green environment-friendly cementing material is added with calcined clay, limestone powder and gypsum, so that the cement consumption is greatly reduced compared with the traditional cementing material, and the added materials are matched with the method for manufacturing the materials provided by the invention to manufacture the core-shell structure lightweight aggregate with extremely low water absorption and high particle bearing capacity.
Firstly, putting core material particles into a lightweight aggregate granulation device, then putting a calcined clay-based green environment-friendly cementing material into the lightweight aggregate granulation device, and uniformly spraying a mixing agent for granulation to form primary cold-bonded aggregate; it should be noted that, the calcined clay-based green environment-friendly cementing materials put into the lightweight aggregate granulation device are all dry materials, in a preferred embodiment, the core material particles are expanded perlite particles, and before the lightweight aggregate granulation device works, the working parameters of the device need to be adjusted, and through repeated tests, a preferred parameter range of the operation of the lightweight aggregate granulation device is obtained: the inclination angle is 40-75 DEG, the rotation speed is 30-50 rpm, and the optimum inclination angle is 50 DEG, and the optimum rotation speed is 40 rpm. After the working parameters are adjusted, firstly, the expanded perlite or other core material particles are put into a light aggregate granulation device, the light aggregate granulation device is started, then, a calcined clay-based green environment-friendly cementing material is put in, and a mixing agent is uniformly sprayed, wherein the mixing agent is formed by mixing water and a curing agent, and the whole granulation process is about fifteen minutes. In this example, for better illustration, the aggregate just after granulation, which is discharged from the lightweight aggregate granulation apparatus, is named as primary cold-bonded aggregate in the present invention.
The shell material is sprayed with the mixing agent in the process of putting the shell material, the shell material is in a state in the process of forming, the shell material is greatly improved in adsorption capacity due to the fact that the mixing agent is sprayed, and meanwhile, the core material particles have a strong water absorption function, so that the shell material has an internal curing function.
Carrying out primary curing on the primary cold-bonded aggregate; and the first curing is to put the primary cold-bonded aggregate in an environment with the temperature of 20 +/-3 ℃ and the relative humidity of 70-95% for curing for a period of time. In this embodiment, the primary cold-bonded aggregate is cured for the first time, and after many times of tests, it is preferably cured for 24 hours in an environment with a temperature of 20 ± 3 ℃ and a relative humidity of 90%, and then cured at the following set temperatures: and maintaining the mixture in a digital display constant temperature circulating water tank with high temperature of 90 ℃ and relative humidity of 98% for 48 hours. Screening and selecting the aggregates subjected to the first maintenance according to the particle size of the aggregates, then putting the aggregates subjected to the first maintenance into a solution containing an organic acid or a phenol compound for soaking for 12 hours, taking out and airing, and then carrying out surface superhydrophobic treatment to form the aggregates with superhydrophobic surfaces; the surface super-hydrophobic treatment specifically comprises the steps of repeatedly spraying a calcium hydroxide aqueous solution on the surface of the aggregate, enabling the surface of the shell material 3 of the aggregate to be coated by repeatedly spraying the calcium hydroxide aqueous solution on the surface of the aggregate, and further carbonizing the shell material 3 sprayed with the calcium hydroxide aqueous solution on the surface, so that organic acid calcium nano-particles can be formed on the surface of the shell material 3, and the directional growth of calcium carbonate crystals is enhanced. Referring to fig. 2, 3, 4, 5, the organic acid calcium nanoparticles belong to nano-scale microprotrusions 1, the stable contact angle of the nano-scale microprotrusions 1 with water 2 is greater than 150 ° (see fig. 3), and the contact rolling angle is less than 10 °, thus forming a surface superhydrophobic aggregate;
in the above examples, the carbonization was performed in the carbonization chamber, and the carbon dioxide concentration added in the carbonization chamber was: 20 +/-2%, and controlling temperature: 20 +/-1 ℃, humidity control: 70 plus or minus 5 percent.
FIG. 5 is a microscopic structure view of the core-shell structured lightweight aggregate prepared by the cold-bonding method under a scanning electron microscope. It should be noted that, a scale is shown below fig. 5, the total length of 10 cells of the scale is 1 μm, and the length of each cell is 0.1 μm, that is, 100n meters. Therefore, referring to a scale, as can be clearly seen from fig. 5, the lightweight aggregate prepared by the preparation method of the present invention is clearly observed to be covered with the nano-scale micro-protrusions on the surface under the scanning of a scanning electron microscope, and therefore, the size of each micro-protrusion is about 100 nm, such that the stable contact angle of the aggregate surface and water is greater than 150 °, and the contact rolling angle is less than 10 °. Therefore, due to the existence of the micro-bulges distributed on the surface of the aggregate, the surface of the lightweight aggregate prepared by the preparation method disclosed by the invention forms a super-hydrophobic physical structure.
In the above embodiment, the organic acid may be: gallic acid Gallic acid, L-DOPA levodopa, etc., and the phenol compound is benzene hydroquinone, etc.
And continuously putting the super-hydrophobic aggregate on the surface into water or a high-humidity environment (RH is more than 98%) for secondary maintenance to produce the super-hydrophobic high-strength lightweight aggregate. In this example, the second curing was performed in water.
In one embodiment, the core material particles, in addition to being expanded perlite particles, include: polystyrene foam particles, mining waste rocks, smelting waste residues, various coal gangues and furnace slag. Polystyrene foam particles and solid waste particles are used as core materials. Thus, the core material particles are solid waste particles having light weight and distinct particle type characteristics. The preparation process is the same as that of the expanded perlite particles regardless of the core material particles, and thus, the details thereof are not repeated.
Referring to fig. 2 and 3, the present invention further provides the following technical solutions: the method for preparing the lightweight aggregate with the core-shell structure by the cold bonding method comprises the following steps: a core material particle 4 and a shell material 3, the shell material 3 being coated outside the core material particle 4, the shell material 3 comprising: ordinary portland cement, calcined clay, limestone powder and gypsum.
In one embodiment, the housing material 3 comprises: the ordinary portland cement, the calcined clay, the limestone powder and the gypsum are prepared according to the following mixture ratio:
ordinary portland cement: 40-50 parts;
calcining the clay: 20-30 parts of a solvent;
limestone powder: 10-15 parts;
gypsum: 1-5 parts.
In one embodiment, the exterior of the shell material 3 is coated with an organic acid layer or a phenol layer, and the shell material 3 whose surface is sprayed with an aqueous solution of calcium hydroxide is repeatedly sprayed on the exterior of the organic acid layer or the phenol layer, and then the shell material 3 whose surface is sprayed with the aqueous solution of calcium hydroxide is further carbonized, so that on one hand, organic calcium carbonate nanoparticles can be formed on the surface of the shell material 3, and on the other hand, the directional growth of calcium carbonate crystals can be enhanced. FIG. 5 is a microscopic structure view of the core-shell structured lightweight aggregate prepared by the cold-bonding method under a scanning electron microscope. Therefore, as can be clearly seen from fig. 5, the lightweight aggregate prepared by the preparation method of the present invention is clearly observed to be covered with the nano-scale micro-protrusions on the surface under the scanning of a scanning electron microscope, and the size of each micro-protrusion is about 100 nm, such that the stable contact angle of the aggregate surface and water is greater than 150 °, and the contact rolling angle is less than 10 °. Therefore, due to the existence of the micro-bulges distributed on the surface of the aggregate, the surface of the lightweight aggregate prepared by the preparation method disclosed by the invention forms a super-hydrophobic structure. In one embodiment, the core material particles comprise: expanded perlite particles, polystyrene foam particles, mining waste rocks, smelting waste residues, various coal gangues and furnace slag.
FIG. 4 is a schematic diagram of a finished product of the lightweight aggregate with the core-shell structure prepared by the cold-bonding method, and the lightweight aggregate prepared by the method has a bulk density of 800-900 kg/m according to statistics of test tests3The cylinder pressure strength is 7-9 MPa, the water absorption rate is only 2-5%, the stable contact angle of the aggregate surface and water is more than 150 degrees, and the contact rolling angle is less than 10 degrees.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (8)
1. A method for preparing core-shell structure lightweight aggregate by a cold bonding method is characterized by comprising the following steps:
(1) preparing a calcined clay-based green environment-friendly cementing material from ordinary portland cement, calcined clay, limestone powder and gypsum according to a proportion;
(2) putting core material particles into a light aggregate granulation device, then putting the calcined clay-based green environment-friendly cementing material prepared in the step (1), and uniformly spraying a mixing agent for granulation to form primary cold-bonded aggregate, wherein the mixing agent is formed by mixing water and a curing agent;
(3) performing primary curing on the primary cold-bonded aggregate formed in the step (2);
(4) placing the aggregate subjected to the first maintenance in the step (3) into a solution containing an organic acid or a phenol compound for soaking for 12 hours, taking out and airing, and then carrying out surface super-hydrophobic treatment to form a surface super-hydrophobic aggregate; the surface super-hydrophobic treatment is to spray calcium hydroxide water solution on the surface of the aggregate repeatedly and put the aggregate into a carbonization box for carbonization;
(5) and continuously putting the aggregate with the super-hydrophobic surface into water for secondary maintenance to produce the super-hydrophobic high-strength lightweight aggregate.
2. The method for preparing the lightweight aggregate with the core-shell structure by the cold bonding method according to claim 1, wherein in the step (2), the core material particles are solid waste particles with light weight and obvious particle type characteristics, and the method comprises the following steps: expanded perlite particles, polystyrene foam particles, mining waste rocks, smelting waste residues, various coal gangues and furnace slag.
3. The method for preparing the lightweight aggregate with the core-shell structure by the cold bonding method according to claim 1 or 2, wherein in the step (2), the lightweight aggregate granulation device is a disk lightweight aggregate granulation device, the inclination angle of the disk lightweight aggregate granulation device is 40-75 degrees, and the rotation speed is 30-50 revolutions per minute.
4. The method for preparing the core-shell structure lightweight aggregate by the cold bonding method according to claim 1, wherein in the step (3), the primary curing is performed by placing the primary cold-bonded aggregate in an environment with a temperature of 20 +/-3 ℃ and a relative humidity of 70-95% for a period of time.
5. The method for preparing lightweight aggregate with core-shell structure by cold bonding method according to claim 4, wherein in step (3), the primary cold-bonded aggregate is put into a sealed constant temperature circulating curing box for curing for 12 hours, and the working temperature of the constant temperature circulating curing box is set as follows: the temperature was 90 ℃ and the relative humidity was 98%.
6. A core-shell structured lightweight aggregate produced by the production method according to claim 1, comprising: the core material particle and the shell material, the shell material cladding outside the core material particle, characterized in that, the shell material includes: ordinary portland cement, calcined clay, limestone powder and gypsum.
7. The core-shell structured lightweight aggregate according to claim 6, wherein the shell material comprises: the ordinary portland cement, the calcined clay, the limestone powder and the gypsum are prepared according to the following mixture ratio:
ordinary portland cement: 40-50 parts;
calcining the clay: 20-30 parts of a solvent;
limestone powder: 10-15 parts;
gypsum: 1-5 parts.
8. The core-shell structured lightweight aggregate according to claim 6, wherein the core material particles are solid waste particles having lightweight and distinct particle type characteristics, comprising: expanded perlite particles, polystyrene foam particles, mining waste rocks, smelting waste residues, various coal gangues and furnace slag.
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| CN202010505114.7A CN111592259A (en) | 2020-06-05 | 2020-06-05 | Core-shell structure lightweight aggregate prepared by cold bonding method and preparation method thereof |
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| CN112167005A (en) * | 2020-09-14 | 2021-01-05 | 深圳大学 | Preparation method of artificial soil particles based on sludge |
| CN112661430B (en) * | 2020-12-25 | 2023-02-07 | 建华建材（中国）有限公司 | Irregular light aggregate and concrete containing same |
| CN112876169B (en) * | 2021-02-24 | 2022-08-26 | 辽宁壹立方砂业有限责任公司 | Slurry coating composition, slurry coating aggregate and preparation method thereof |
| CN115611544A (en) * | 2021-07-16 | 2023-01-17 | 协兴建筑科技有限公司 | Inorganic expanded perlite light particles and preparation process and application thereof |
| CN113955963B (en) * | 2021-10-28 | 2022-06-21 | 北京建筑材料科学研究总院有限公司 | Hollow calcination-free lightweight aggregate and preparation method thereof |
| CN114409292B (en) * | 2022-02-07 | 2022-10-04 | 武汉理工大学 | Enhancement layer, enhancement type lightweight aggregate and preparation method and application thereof |
| CN114988842A (en) * | 2022-05-05 | 2022-09-02 | 北方民族大学 | Silicon-manganese slag core-shell lightweight aggregate and preparation method thereof |
| CN115140959B (en) * | 2022-07-26 | 2023-03-14 | 山东大学 | Alkali-sulfur double-excitation multi-shell-layer high-strength baking-free lightweight aggregate and preparation method and application thereof |
| CN115259712A (en) * | 2022-08-31 | 2022-11-01 | 霖和气候科技(北京)有限公司 | Preparation method of high-solid waste base-converged carbonized baking-free lightweight aggregate |
| CN117534504A (en) * | 2022-10-25 | 2024-02-09 | 上海建工建材科技集团股份有限公司 | Mine fine tail mud-based baking-free lightweight aggregate and preparation method thereof |
| CN116375378B (en) * | 2023-04-14 | 2024-02-02 | 深圳大学 | Preparation method of solid waste solidified river sediment heavy metal and baking-free casing ceramsite, and river sediment-based baking-free casing ceramsite |
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| CN103496866B (en) * | 2013-09-23 | 2016-08-31 | 东南大学 | A kind of hud typed cement base high-strength light aggregate processing method |
| CN105174766B (en) * | 2015-07-07 | 2017-05-10 | 东南大学 | Method for reinforcing recycled concrete fine aggregate by using carbon dioxide |
| CN109206037A (en) * | 2018-09-28 | 2019-01-15 | 镇江苏博特新材料有限公司 | The surface treatment method and cement base water-permeable brick surface layer of clay brick recycled fine aggregate |
| CN109439193B (en) * | 2018-11-02 | 2020-10-23 | 山西大学 | Solid waste based super-hydrophobic coating and coating method thereof |
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