CN112608079A - Method for recycling waste concrete - Google Patents
Method for recycling waste concrete Download PDFInfo
- Publication number
- CN112608079A CN112608079A CN202011435792.7A CN202011435792A CN112608079A CN 112608079 A CN112608079 A CN 112608079A CN 202011435792 A CN202011435792 A CN 202011435792A CN 112608079 A CN112608079 A CN 112608079A
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- China
- Prior art keywords
- recycled
- concrete
- waste concrete
- prefabricated
- crushing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- 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
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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
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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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
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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for recycling waste concrete, which comprises the following steps: collecting waste concrete generated in the building demolition process, removing impurities, and crushing by using crushing equipment; screening the crushed waste concrete by using a vibrating screen to obtain regenerated fine aggregate and regenerated coarse aggregate; uniformly stirring the recycled fine aggregate, the recycled coarse aggregate and the cement according to a preset proportion, adding water, an admixture and an additive, and uniformly mixing to obtain recycled concrete for construction; and after the engineering is finished, crushing the recycled concrete for the construction, preparing the recycled concrete again, and pouring the prepared recycled concrete into a mold to prepare a prefabricated product. According to the scheme, the waste concrete is recycled without being calcined, so that the problems that the waste concrete occupies land and damages ecological environment are solved, and the construction cost of building construction is reduced.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a method for recycling waste concrete.
Background
In recent years, due to the rapid development of industrialization and urbanization in China, the construction of houses, urban infrastructures and roads and bridges is accelerated, and a large amount of waste concrete is generated in the processes of new construction and maintenance and dismantling of old buildings. According to the estimation of relevant experts, only in a cement concrete pavement of a highway, about 4000 million tons of waste concrete are generated every year, and in addition, in China, nearly hundred million tons of waste concrete are generated every year by the dismantling of facilities such as waste buildings, roads and bridges and the like. At present, the main mode of treating the waste concrete in China is landfill treatment, so that the waste concrete is not only consumed by construction expenses such as garbage clearing and transportation, but also occupies a large amount of land resources and destroys the ecological environment. In addition, another treatment method is to comprehensively recycle the waste concrete, some experts and scholars directly crush the waste concrete to prepare recycled coarse aggregate, and some experts and scholars excite the potential activity of the fine aggregate of the waste concrete by means of grinding, high-temperature calcination and the like to recycle the fine aggregate, but the utilization rate of the waste concrete is low, which causes energy waste, and the waste gas generated in the calcination process causes secondary pollution to the surrounding ecological environment.
In addition, under the requirement of 'ten' full coverage in the building industry of China, the field is basically hardened when a new project is built, and a large amount of concrete is needed. These concretes are mainly made by mixing cement, sand, gravel, fly ash and other raw materials, and are generally broken by an excavator after completion of the construction and buried as waste concrete waste.
Disclosure of Invention
The invention aims to solve the technical problems that a large amount of waste concrete is accumulated, a good field is occupied and the environment is polluted due to low recycling rate of the waste concrete, a large amount of concrete is required for hardening in the process of temporary construction of a new construction project, and a large amount of waste concrete is generated due to later-stage crushing.
In order to solve the technical problems, the invention provides the following technical scheme:
a method for recycling waste concrete comprises the following steps:
s1, collecting waste concrete generated in the building dismantling process, removing impurities, and crushing by using crushing equipment;
s2, screening the crushed waste concrete by using vibrating screens with meshes of 25mm and 5mm in sequence to obtain regenerated fine aggregate with the particle size of less than 5mm and regenerated coarse aggregate with the particle size of between 5mm and 25mm, and returning the waste concrete with the particle size of more than 25mm to crushing equipment for re-crushing until the particle size of all the crushed particles is below 25 mm;
s3, uniformly stirring the recycled fine aggregate and the recycled coarse aggregate prepared in the S2 and cement according to a preset proportion, adding water, an admixture and an additive, and uniformly mixing to obtain recycled concrete with the slump of 180cm +/-20 and the strength of C20 for temporary construction;
and S4, after the project is completed, crushing the recycled concrete for the construction, preparing the recycled concrete again through S2 and S3, and pouring the prepared recycled concrete into a mold to prepare a prefabricated product.
Wherein the S3 comprises the following components in parts by weight:
cement: 10% -15%;
regenerating fine aggregate: 20 to 30 percent;
and (3) regenerating coarse aggregate: 53 percent;
blending materials: 0% -10%;
water: 5% -15%;
additive: 0 to 1.5 percent.
Wherein the admixture in the S3 is fly ash and/or slag powder.
Wherein the additive in S3 is a polycarboxylic acid high-efficiency water reducing agent.
Wherein the prefabricated product in the S4 is a prefabricated plate, a prefabricated cable trench, a prefabricated drainage trench, a prefabricated cover plate or a prefabricated floor tile.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the recycled concrete meeting the requirements of the construction of the temporary building is prepared by taking the waste concrete as the raw material, so that the recycled concrete can be recycled, and the waste concrete is completely recycled under the condition of no need of calcination, thereby solving the problems that the waste concrete occupies the land and damages the ecological environment, and simultaneously reducing the cost of the construction of the temporary building.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description is given with reference to specific embodiments.
The embodiment of the invention provides a method for recycling waste concrete, which comprises the following steps:
s1, collecting waste concrete generated in the building dismantling process, removing impurities, and crushing by using crushing equipment;
s2, screening the crushed waste concrete by using vibrating screens with meshes of 25mm and 5mm in sequence to obtain regenerated fine aggregate with the particle size of less than 5mm and regenerated coarse aggregate with the particle size of between 5mm and 25mm, and returning the waste concrete with the particle size of more than 25mm to crushing equipment for re-crushing until the particle size of all the crushed particles is below 25 mm;
s3, uniformly stirring the recycled fine aggregate and the recycled coarse aggregate prepared in the S2 and cement according to a preset proportion, adding water, an admixture and an additive, and uniformly mixing to obtain recycled concrete with the slump of 180cm +/-20 and the strength of C20 for temporary construction;
and S4, after the project is completed, crushing the recycled concrete for the construction, preparing the recycled concrete again through S2 and S3, and pouring the prepared recycled concrete into a mold to prepare a prefabricated product.
Wherein the S3 comprises the following components in parts by weight:
cement: 10% -15%;
regenerating fine aggregate: 20 to 30 percent;
and (3) regenerating coarse aggregate: 53 percent;
blending materials: 0% -10%;
water: 5% -15%;
additive: 0 to 1.5 percent.
Wherein the cement in the S3 is ordinary Portland 425# cement, the admixture is fly ash and/or slag powder, and the additive is a polycarboxylic acid high-efficiency water reducing agent.
Specifically, 30.3Kg of cement, 14Kg of fly ash, 52.1Kg of recycled fine aggregate, 126.1Kg of recycled coarse aggregate, 18Kg of water and 151g of polycarboxylic acid high-efficiency water reducer are taken.
The performance parameters of the prepared recycled concrete are shown in table 1:
TABLE 1 Performance parameters Table for recycled concrete
Wherein the prefabricated product in the S4 is a prefabricated plate, a prefabricated cable trench, a prefabricated drainage trench, a prefabricated cover plate or a prefabricated floor tile.
In the scheme, the recycled concrete meeting the requirements of the construction of the temporary building is prepared by taking the waste concrete as a raw material, so that the recycled concrete can be recycled, and the waste concrete is completely recycled under the condition of no need of calcination, thereby solving the problems that the waste concrete occupies the land and damages the ecological environment, and simultaneously reducing the cost of the construction of the temporary building; the flow property and the strength of the recycled concrete prepared by the proportion can meet the requirement of construction and construction, the process is simple, and the recycled concrete has good flow property by adjusting the adding proportion of water and the additive.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A method for recycling waste concrete is characterized by comprising the following steps:
s1, collecting waste concrete generated in the building dismantling process, removing impurities, and crushing by using crushing equipment;
s2, screening the crushed waste concrete by using vibrating screens with meshes of 25mm and 5mm in sequence to obtain regenerated fine aggregate with the particle size of less than 5mm and regenerated coarse aggregate with the particle size of between 5mm and 25mm, and returning the waste concrete with the particle size of more than 25mm to crushing equipment for re-crushing until the particle size of all the crushed particles is below 25 mm;
s3, uniformly stirring the recycled fine aggregate and the recycled coarse aggregate prepared in the S2 and cement according to a preset proportion, adding water, an admixture and an additive, and uniformly mixing to obtain recycled concrete with the slump of 180cm +/-20 and the strength of C20 for temporary construction;
and S4, after the project is completed, crushing the recycled concrete for the construction, preparing the recycled concrete again through S2 and S3, and pouring the prepared recycled concrete into a mold to prepare a prefabricated product.
2. The method for recycling waste concrete according to claim 1, wherein the weight ratio of each component in S3 is as follows:
cement: 10% -15%;
regenerating fine aggregate: 20 to 30 percent;
and (3) regenerating coarse aggregate: 53 percent;
blending materials: 0% -10%;
water: 5% -15%;
additive: 0 to 1.5 percent.
3. The method for recycling waste concrete according to claim 1, wherein the admixture in S3 is fly ash and/or slag powder.
4. The method for recycling waste concrete according to claim 1, wherein the admixture in S3 is a polycarboxylic acid high-efficiency water reducing agent.
5. The method for recycling waste concrete according to claim 1, wherein the prefabricated product in S4 is prefabricated slab, prefabricated cable trench, prefabricated drainage ditch, prefabricated cover plate or prefabricated floor tile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011435792.7A CN112608079A (en) | 2020-12-10 | 2020-12-10 | Method for recycling waste concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011435792.7A CN112608079A (en) | 2020-12-10 | 2020-12-10 | Method for recycling waste concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112608079A true CN112608079A (en) | 2021-04-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011435792.7A Pending CN112608079A (en) | 2020-12-10 | 2020-12-10 | Method for recycling waste concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112608079A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087451A (en) * | 2021-04-28 | 2021-07-09 | 苏永青 | Composite concrete and preparation process thereof |
| CN113185198A (en) * | 2021-05-13 | 2021-07-30 | 苏永青 | Green concrete and preparation process thereof |
| CN114411921A (en) * | 2022-01-26 | 2022-04-29 | 西安公路研究院有限公司 | Method and structure for building roadbed drainage ditch through road reconstruction and extension |
| CN116553870A (en) * | 2023-05-04 | 2023-08-08 | 江苏晨马建筑科技有限公司 | Environment-friendly concrete formula for prefabricated rainwater and sewage well and preparation method of environment-friendly concrete formula |
Citations (3)
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|---|---|---|---|---|
| CN106007556A (en) * | 2016-05-13 | 2016-10-12 | 广州大学 | Pumpable high-strength recycled concrete and preparation technology thereof |
| CN106186853A (en) * | 2016-06-29 | 2016-12-07 | 攀枝花学院 | A kind of preparation method of regeneration concrete |
| CN111620610A (en) * | 2020-06-28 | 2020-09-04 | 宁波新力建材科技有限公司 | Recycling method of concrete waste and recycled concrete |
-
2020
- 2020-12-10 CN CN202011435792.7A patent/CN112608079A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007556A (en) * | 2016-05-13 | 2016-10-12 | 广州大学 | Pumpable high-strength recycled concrete and preparation technology thereof |
| CN106186853A (en) * | 2016-06-29 | 2016-12-07 | 攀枝花学院 | A kind of preparation method of regeneration concrete |
| CN111620610A (en) * | 2020-06-28 | 2020-09-04 | 宁波新力建材科技有限公司 | Recycling method of concrete waste and recycled concrete |
Non-Patent Citations (1)
| Title |
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| 张顺: ""全再生骨料混凝土高性能化及再循环研究"", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087451A (en) * | 2021-04-28 | 2021-07-09 | 苏永青 | Composite concrete and preparation process thereof |
| CN113087451B (en) * | 2021-04-28 | 2022-12-13 | 义乌市固合商品混凝土有限公司 | Composite concrete and preparation process thereof |
| CN113185198A (en) * | 2021-05-13 | 2021-07-30 | 苏永青 | Green concrete and preparation process thereof |
| CN114411921A (en) * | 2022-01-26 | 2022-04-29 | 西安公路研究院有限公司 | Method and structure for building roadbed drainage ditch through road reconstruction and extension |
| CN114411921B (en) * | 2022-01-26 | 2024-01-30 | 西安公路研究院有限公司 | Road reconstruction and extension roadbed drainage ditch masonry method and structure |
| CN116553870A (en) * | 2023-05-04 | 2023-08-08 | 江苏晨马建筑科技有限公司 | Environment-friendly concrete formula for prefabricated rainwater and sewage well and preparation method of environment-friendly concrete formula |
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Application publication date: 20210406 |