CN113372046A - Preparation method of recycled fine aggregate concrete - Google Patents
Preparation method of recycled fine aggregate concrete Download PDFInfo
- Publication number
- CN113372046A CN113372046A CN202110742307.9A CN202110742307A CN113372046A CN 113372046 A CN113372046 A CN 113372046A CN 202110742307 A CN202110742307 A CN 202110742307A CN 113372046 A CN113372046 A CN 113372046A
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- CN
- China
- Prior art keywords
- fine aggregate
- recycled fine
- parts
- stirrer
- following
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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
-
- 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
- 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
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a preparation method of recycled fine aggregate concrete, which is prepared from the following raw materials in parts by weight: 300-700 parts of coarse aggregate, 700-900 parts of recycled fine aggregate, 110-230 parts of cement, 200-500 parts of water, 3-15 parts of polycarboxylic acid high-efficiency water reducing agent and 50-80 parts of mineral powder, wherein the recycled fine aggregate is waste concrete particles after shaping, and the strength of the concrete can be improved by shaping the recycled fine aggregate.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a preparation method of recycled fine aggregate concrete.
Background
The recycled fine aggregate prepared by the waste concrete can reduce the consumption of the natural aggregate in the construction industry, can also reduce the problems of the gradual deterioration of the ecological environment and the like caused by concrete waste, is beneficial to the sustainable development of human society, and generally has the advantages of multiple edges and corners, rough surface and multiple cracks of the recycled fine aggregate particles obtained by simple crushing, and also contains a large amount of hardened cement mortar, so that the recycled fine aggregate has poor particle shape, high porosity, high water absorption, low stacking density and low strength, and the recycled concrete prepared from the recycled fine aggregate has large water consumption, low strength after hardening and low elastic modulus, so that the recycled fine aggregate is urgently required to be subjected to subsequent processing treatment to realize the partial or complete replacement of the natural fine aggregate.
Disclosure of Invention
The invention aims to provide a preparation method of recycled fine aggregate concrete, which solves the problems mentioned in the background technology.
In order to achieve the aim, the invention provides a preparation method of recycled fine aggregate concrete, which is prepared from the following raw materials in parts by weight: 300-700 parts of coarse aggregate, 700-900 parts of recycled fine aggregate, 110-230 parts of cement, 200-500 parts of water, 3-15 parts of polycarboxylic acid high-efficiency water reducing agent and 50-80 parts of mineral powder, wherein the recycled fine aggregate is shaped waste concrete particles.
Preferably, the recycled fine aggregate is prepared by the following steps in sequence:
a. pretreatment: cleaning the sorted waste concrete, soaking for 24h in , and then fishing out and drying in the air;
b. primary crushing: crushing the dried waste concrete by a jaw crusher, and sieving to obtain particles with the diameter less than 5mm as a recycled fine aggregate blank and particles with the diameter more than 5mm as a recycled coarse aggregate;
c. secondary crushing: crushing the regenerated coarse aggregate again by a counterattack type stone crusher to obtain a regenerated fine aggregate blank with the diameter less than 5 mm;
d. shaping: and c, shaping the blank of the recycled fine aggregate obtained in the step b and the step c by using a stone shaping machine to obtain the recycled fine aggregate.
Preferably, the recycled fine aggregate concrete is prepared by the following steps in sequence:
step one, adding coarse aggregate and cement into a stirrer respectively and uniformly mixing;
adding sufficient water into a stirrer, adding a polycarboxylic acid high-efficiency water reducing agent, and starting the stirrer until the mixture is stirred into a slurry state;
and step three, sequentially adding the mineral powder and the regenerated fine aggregate into a stirrer, starting the stirrer, and uniformly mixing to obtain the regenerated fine aggregate concrete.
Preferably, the rotating speed of the stirrer in the step one is 500r/min, and the stirring time is 30 min.
Preferably, the rotating speed of the stirrer in the step one is 700r/min, and the stirring time is 60 min.
Preferably, the rotating speed of the stirrer in the step one is 700r/min, and the stirring time is 10 min.
Preferably, the mineral powder is at least one of fly ash, mineral powder and silica fume.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can improve the strength of the recycled fine aggregate concrete;
2. according to the invention, after the simply crushed recycled fine aggregate is shaped, the conditions of more edges and corners and rough surface of the simply crushed recycled fine aggregate can be effectively improved, so that the water consumption is effectively reduced, and the bulk density and the dense density of the simply crushed recycled fine aggregate can be improved.
Detailed Description
Example 1
The recycled fine aggregate concrete is prepared from the following raw materials in parts by weight: 700 parts of coarse aggregate, 900 parts of recycled fine aggregate, 230 parts of cement, 500 parts of water, 15 parts of polycarboxylic acid high-efficiency water reducing agent and 80 parts of mineral powder, wherein the recycled fine aggregate is shaped waste concrete particles.
Example 2
The recycled fine aggregate is prepared by the following steps in sequence:
a. pretreatment: cleaning the sorted waste concrete, soaking for 24h in , and then fishing out and drying in the air;
b. primary crushing: crushing the dried waste concrete by a jaw crusher, and sieving to obtain particles with the diameter less than 5mm as a recycled fine aggregate blank and particles with the diameter more than 5mm as a recycled coarse aggregate;
c. secondary crushing: crushing the regenerated coarse aggregate again by a counterattack type stone crusher to obtain a regenerated fine aggregate blank with the diameter less than 5 mm;
d. shaping: and c, shaping the blank of the recycled fine aggregate obtained in the step b and the step c by using a stone shaping machine to obtain the recycled fine aggregate.
Example 3
The recycled fine aggregate concrete is prepared by the following steps in sequence:
step one, adding coarse aggregate and cement into a stirrer respectively, and uniformly mixing, wherein the rotating speed of the stirrer is 500r/min, and the stirring time is 30 min;
adding sufficient water into a stirrer, adding a polycarboxylic acid high-efficiency water reducing agent, starting the stirrer until the stirrer is stirred into a slurry state, wherein the rotating speed of the stirrer is 700r/min, and the stirring time is 60 min;
and step three, adding the mineral powder and the regenerated fine aggregate into a stirrer in sequence, starting the stirrer, and uniformly mixing to obtain the regenerated fine aggregate concrete, wherein the rotating speed of the stirrer is 700r/min, and the stirring time is 10 min.
The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description, since such modifications are intended to be included within the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A preparation method of recycled fine aggregate concrete is characterized by comprising the following steps: the recycled fine aggregate concrete is prepared from the following raw materials in parts by weight: 300-700 parts of coarse aggregate, 700-900 parts of recycled fine aggregate, 110-230 parts of cement, 200-500 parts of water, 3-15 parts of polycarboxylic acid high-efficiency water reducing agent and 50-80 parts of mineral powder, wherein the recycled fine aggregate is shaped waste concrete particles.
2. The method for preparing recycled fine aggregate concrete according to claim 1, wherein the method comprises the following steps: the recycled fine aggregate is prepared by the following steps in sequence:
a. pretreatment: cleaning the sorted waste concrete, soaking for 24h in , and then fishing out and drying in the air;
b. primary crushing: crushing the dried waste concrete by a jaw crusher, and sieving to obtain particles with the diameter less than 5mm as a recycled fine aggregate blank and particles with the diameter more than 5mm as a recycled coarse aggregate;
c. secondary crushing: crushing the regenerated coarse aggregate again by a counterattack type stone crusher to obtain a regenerated fine aggregate blank with the diameter less than 5 mm;
d. shaping: and c, shaping the blank of the recycled fine aggregate obtained in the step b and the step c by using a stone shaping machine to obtain the recycled fine aggregate.
3. The method for preparing recycled fine aggregate concrete according to claim 2, wherein the method comprises the following steps: the recycled fine aggregate concrete is prepared by the following steps in sequence:
step one, adding coarse aggregate and cement into a stirrer respectively and uniformly mixing;
adding sufficient water into a stirrer, adding a polycarboxylic acid high-efficiency water reducing agent, and starting the stirrer until the mixture is stirred into a slurry state;
and step three, sequentially adding the mineral powder and the regenerated fine aggregate into a stirrer, starting the stirrer, and uniformly mixing to obtain the regenerated fine aggregate concrete.
4. The method for preparing recycled fine aggregate concrete according to claim 3, wherein the method comprises the following steps: the rotating speed of the stirrer in the first step is 500r/min, and the stirring time is 30 min.
5. The method for preparing recycled fine aggregate concrete according to claim 3, wherein the method comprises the following steps: the rotating speed of the stirrer in the first step is 700r/min, and the stirring time is 60 min.
6. The method for preparing recycled fine aggregate concrete according to claim 3, wherein the method comprises the following steps: the rotating speed of the stirrer in the first step is 700r/min, and the stirring time is 10 min.
7. The method for preparing recycled fine aggregate concrete according to claim 1, wherein the method comprises the following steps: the mineral powder is at least one of fly ash, mineral powder and silica fume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110742307.9A CN113372046A (en) | 2021-07-01 | 2021-07-01 | Preparation method of recycled fine aggregate concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110742307.9A CN113372046A (en) | 2021-07-01 | 2021-07-01 | Preparation method of recycled fine aggregate concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113372046A true CN113372046A (en) | 2021-09-10 |
Family
ID=77580353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110742307.9A Pending CN113372046A (en) | 2021-07-01 | 2021-07-01 | Preparation method of recycled fine aggregate concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113372046A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060753A (en) * | 2015-08-20 | 2015-11-18 | 浙江工业大学 | Particle shaping method for machine-made aggregate |
| CN105367004A (en) * | 2015-11-27 | 2016-03-02 | 山西四建集团有限公司 | C30 durable recycled shaping aggregate concrete prepared from construction wastes and preparation method |
-
2021
- 2021-07-01 CN CN202110742307.9A patent/CN113372046A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060753A (en) * | 2015-08-20 | 2015-11-18 | 浙江工业大学 | Particle shaping method for machine-made aggregate |
| CN105367004A (en) * | 2015-11-27 | 2016-03-02 | 山西四建集团有限公司 | C30 durable recycled shaping aggregate concrete prepared from construction wastes and preparation method |
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Application publication date: 20210910 |
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| RJ01 | Rejection of invention patent application after publication |