CN112194398A - Preparation method of waste brick aggregate - Google Patents
Preparation method of waste brick aggregate Download PDFInfo
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- CN112194398A CN112194398A CN202011084119.3A CN202011084119A CN112194398A CN 112194398 A CN112194398 A CN 112194398A CN 202011084119 A CN202011084119 A CN 202011084119A CN 112194398 A CN112194398 A CN 112194398A
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- aggregate
- waste
- waste brick
- brick
- 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
- 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
- C04B20/04—Heat 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
-
- 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
-
- 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
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a preparation method of waste brick aggregate, which comprises the steps of crushing waste bricks, screening waste brick particles with the particle size of 2-20mm, and then treating the waste brick particles with polyvinylpyrrolidone to prepare the waste brick aggregate. By the method, the prepared waste brick aggregate has higher compressive strength.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a preparation method of waste brick aggregate and the waste brick aggregate prepared by the preparation method.
Background
With the steady development of national economy and the acceleration of urbanization process in China, the quantity of building wastes generated by dismantling a large number of old buildings is increasing day by day, and the large quantity of building wastes are transported to the outsides or the periphery of cities for landfill or open-air stockpiling, thus not only wasting land and resources, but also polluting the environment. It is estimated that cities in China generate about 70 million tons of garbage annually, and the amount of garbage is continuously increasing, wherein the amount of construction garbage is about 33 million tons, and the total amount of garbage accounts for about 50 percent of the total amount of the urban garbage. Most of the demolished buildings are brick-concrete structure buildings, and the construction waste bricks account for a considerable proportion of the construction waste generated by demolishing the buildings. How to realize recycling of the construction waste bricks is widely researched.
CN102815964A discloses a construction waste recycling process, which comprises the following steps: collecting waste concrete, waste mortar and waste brick slag; crushing and screening: crushing and screening the collected waste concrete, waste mortar and waste brick slag to obtain a regenerated coarse aggregate and a regenerated fine aggregate; preparing foam concrete: preparing cement slurry: uniformly stirring cement, water, the recycled coarse aggregate and the recycled fine aggregate to obtain cement slurry; foam diluent addition: and adding the foam diluent formed by uniformly mixing the foaming agent and water into the cement slurry and uniformly stirring to obtain the foam concrete.
CN105622014A discloses a multi-strength recycled brick aggregate fiber concrete and a preparation method thereof, wherein the multi-strength recycled brick aggregate fiber concrete is prepared from cement, fine aggregate, natural coarse aggregate, recycled brick coarse aggregate, polyolefin fiber, steel fiber and water according to the weight ratio of 1: 0.780 to 1.309: 0-1.830: 0.390 to 1.568: 0-0.019: 0-0.161: 0.33 to 0.48.
CN108911620A discloses a concrete containing recycled baked brick aggregate C40 and a preparation method thereof. The concrete containing the recycled baked brick aggregate C40 is prepared from cement, recycled baked brick coarse aggregate, natural coarse aggregate, fine aggregate and water according to the mass ratio of 1: 0.84-1.04: 0.35-0.45: 0.65-0.80: 030-0.37, and the water-cement ratio is 0.30-0.37; the preparation technology not only improves the strength of the recycled concrete and obviously improves the workability, the fluidity, the cohesiveness and other working performances, but also has the advantages of simple preparation method, high efficiency, environmental protection and energy conservation.
CN108911623A discloses a polypropylene fiber recycled brick concrete coarse aggregate concrete and a preparation method thereof, which is mainly prepared from the following raw materials: the concrete is prepared from water, cement, fine aggregate, recycled brick coarse aggregate, recycled concrete coarse aggregate and polypropylene fiber, wherein the mass ratio of the water, the cement, the fine aggregate, the recycled brick coarse aggregate, the recycled concrete coarse aggregate and the polypropylene fiber is 1: 2.54: 4.49: 3.07: 3.40: 0-1.8: 0.01; the specific preparation method comprises the steps of mixing the raw materials and adding the water reducing agent.
CN108706954A discloses a method for preparing biological bricks based on recycled aggregates, which comprises the following steps: (1) grading the recycled aggregate according to the particle size, and mixing the aggregates with different particle sizes to obtain mixed aggregate; (2) and (2) pouring the mixed aggregate obtained in the step (1) into a mould, injecting a cementing solution into the mould, and standing to obtain the biological brick based on the recycled aggregate.
"influence of typical construction solid waste recycled aggregate on the performance of the environment-friendly brick", Cheng Guo Ming & lt environmental engineering academy, in 2013, regional characteristic aggregates such as construction waste recycled aggregate, bottom slag and stone powder are used for preparing the environment-friendly brick, and the influence of the aggregate on the mechanical property of the environment-friendly brick is systematically investigated. Experimental results show that the influence of the type of the recycled aggregate on the compressive strength of the environment-friendly brick is remarkable, the compressive strength of the environment-friendly brick is gradually increased due to the increase of concrete in the recycled aggregate, and the compressive strength of the environment-friendly brick is obviously reduced due to the increase of the content of clay bricks in the recycled aggregate.
However, in the prior art, when the aggregate is made of the building waste bricks, the compressive strength of the prepared concrete is often not high enough to meet the requirements of some specific applications. Therefore, there is a need for a concrete having high compressive strength using aggregate made of construction waste bricks and a method for preparing the same.
Disclosure of Invention
In order to solve the above problems, the present inventors have conducted systematic studies and numerous experiments to provide a method for preparing a waste brick aggregate. Compared with the common waste brick aggregate, the aggregate prepared by the method has higher compressive strength.
In one aspect of the present invention, there is provided a method for preparing waste brick aggregate, which comprises crushing waste bricks, and sieving waste brick particles having a particle size of 2 to 20mm, preferably 5 to 15 mm.
Preferably, the screened waste brick particles are dried.
Preferably, the drying temperature is 105-120 ℃.
Preferably, wherein the drying time is 1.0-3.0 hours.
Preferably, the dried waste brick particles are then immersed in an ethanol solution of polyvinylpyrrolidone.
In a preferred embodiment of the invention, stirring is optionally carried out during the impregnation, the impregnation time being from 30min to 2 hours.
More preferably, the rotational speed of the stirring does not exceed 60 rpm.
Preferably, the impregnated waste brick particles are taken out and dried.
Preferably, the slurry is applied to the surface of the impregnated aggregate.
Preferably, the slurry is a cement paste. More preferably, the slurry further comprises fly ash.
In another aspect of the present invention, there is provided a waste brick aggregate prepared according to the above method.
Researches show that crystals of the waste brick fine aggregate are in an amorphous state, have an active foundation, and can reduce capillary pores, reduce pore water, reduce capillary force, effectively reduce micro-cracks of concrete and slow down early-stage drying shrinkage of a test block when used as concrete aggregate. Al in fine aggregate of waste brick2O3And SiO2The component is mixed with lime or cement and mixed with water, and then can be made into chemical reaction with calcium hydroxide to produce a series of hydration products of hydrated calcium silicate, hydrated calcium aluminate and so on, and these products can be hardened in air or water and can produce strength so as to reduce Ca (OH) in hydration system2Content, and quickens the hydration process.
However, the recycled aggregate of the waste brick has low strength and strong water absorption, which all limit the application range of the aggregate of the waste brick. If the strength of the waste brick aggregate can be enhanced to some extent by coating the reinforcing material directly on the surface of the waste brick aggregate, for example, by coating cement slurry on the surface, in use, particularly after consolidation, the cement slurry layer is separated and peeled from the waste brick aggregate, resulting in a significant decrease in the strength thereof and generation of fine dust. Research further finds that one of the main reasons causing the cement mortar layer to be stripped from the waste brick aggregate is that the waste brick aggregate has strong water absorbability, and when the cement mortar wraps the waste brick aggregate, the waste brick aggregate absorbs water in the interface between the cement mortar and the aggregate too fast, so that the cement mortar is not sufficiently solidified, and segregation occurs. Therefore, in the present invention, polyvinylpyrrolidone is used to plug the capillary pores in the waste bricks to blockPreventing this phenomenon from occurring. In addition, the polyvinylpyrrolidone modifies the surface of the waste brick aggregate, which is beneficial to the combination with mortar, and an adsorptive protective film can be formed on the surface of the waste brick aggregate particles to block Cl-And the like to corrode metal parts in the concrete.
Preferably, the concentration of polyvinylpyrrolidone in the ethanol solution is 0.5-5.0 wt%.
Preferably, the ethanol can be recovered for reuse. The recovery may be carried out by means conventional in the art, such as heating and condensation or volatilization and condensation.
Preferably, when the cement paste is used, the cement paste has a water-to-gel ratio of 1.0 to 1.5.
Due to the use of polyvinylpyrrolidone, a cement paste with a high water content can be used. The fluidity of the cement paste has obvious influence on the surface coating effect of the waste brick aggregate. When the water-to-glue ratio is adopted, a significantly improved pulp wrapping effect can be obtained compared to a lower water-to-glue ratio.
The inventors have also found that the degree of wetting of the slurry can also be very well controlled due to the use of polyvinylpyrrolidone.
The fly ash particles are mostly glass beads, play a role in lubricating in concrete mixtures, can reduce the internal friction, enable the concrete mixtures doped with fly ash to have better fluidity than standard concrete, are convenient for construction, and have the function of water reduction, and the fine particles in the fly ash can be uniformly distributed in cement paste to fill pores and capillary holes, thereby improving the pore structure of the concrete and increasing the compactness of the concrete.
Therefore, the inventor effectively combines the concrete aggregate containing the waste brick aggregate and the fly ash to play the synergistic promotion effect of the concrete aggregate and the fly ash, thereby realizing the advantage complementation.
Preferably, when fly ash is also included in the slurry, the weight ratio of cement to fly ash is 10:1 to 5: 1.
Preferably, the impregnated waste brick aggregate is placed in a wire mesh basket, placed in prepared cement paste, shaken and vibrated for 3-10min and taken out.
Preferably, curing is carried out at room temperature for 3-7 days after taking out. The crush strength was tested according to GB/T14685-2011.
The crushing index of the recycled aggregate of the waste bricks modified by the method is obviously superior to that of unreinforced aggregate, and the requirements of various application scenes can be met.
Detailed description of the preferred embodiments
In order that the invention may be more clearly understood, reference will now be made in detail to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Taking waste common house building bricks, crushing the building waste bricks by using a jaw crusher, screening waste brick particles with the particle size of 2-20mm, drying the particles at the temperature of 110 ℃ for 1.2 hours, then soaking the dried waste brick particles into an ethanol solution of polyvinylpyrrolidone (the concentration of the polyvinylpyrrolidone is 1.5 wt%), stirring at the speed of 20rpm for 1.5 hours, then taking out the soaked waste brick particles, airing, placing the soaked waste brick aggregates into a wire mesh hanging basket, placing the wire mesh hanging basket into prepared cement paste (the water-cement ratio of the cement paste is 1.3), shaking and vibrating for 3min, taking out, and curing at room temperature for 3d to test the crushing strength. The crush strength was tested according to GB/T14685-2011. The test shows that the compression strength of the test building block is 11.46 MPa.
Comparative example 1
Example 1 was repeated except that no polyvinylpyrrolidone was used for the pretreatment of the waste brick aggregates and the crushed waste brick aggregates were directly wrapped with cement paste. The compressive strength was measured to be 7.69 MPa.
As can be seen from the above examples and comparative examples, the method of the present application provides a significant improvement in the compressive strength of the waste brick aggregate.
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to make and use the invention. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims. All citations referred to herein are incorporated herein by reference to the extent that no inconsistency is made.
Claims (10)
1. The preparation method of the waste brick aggregate comprises the steps of crushing waste bricks and screening waste brick particles with the particle size of 2-20 mm.
2. The method of claim 1, wherein the screened waste brick particles are dried.
3. The method of claim 2, wherein the drying temperature is 105-120 ℃.
4. A process according to claims 2-3, wherein the drying time is 1.0-3.0 hours.
5. A method according to any one of claims 2 to 4, wherein the dried waste brick particles are immersed in an ethanol solution of polyvinylpyrrolidone.
6. The method of claim 5, wherein the stirring is performed during the dipping for 30min to 2 hours.
7. A method according to claim 5 or 6, wherein the impregnated waste brick particles are removed and dried.
8. The method of claim 7, applying a slurry to the surface of the impregnated aggregate.
9. The method of claim 8, the slurry comprising a cement paste.
10. Waste brick aggregate produced according to the method of any one of claims 1-9.
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| CN202011084119.3A CN112194398A (en) | 2020-10-12 | 2020-10-12 | Preparation method of waste brick aggregate |
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| CN202011084119.3A CN112194398A (en) | 2020-10-12 | 2020-10-12 | Preparation method of waste brick aggregate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117945681A (en) * | 2023-11-20 | 2024-04-30 | 中国建筑东北设计研究院有限公司 | Modified waste brick recycled aggregate and preparation method thereof, recycled aggregate permeable brick and recycled aggregate concrete block |
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| CN111620584A (en) * | 2020-06-23 | 2020-09-04 | 宋星雨 | Method for modifying recycled aggregate |
| CN111732384A (en) * | 2020-06-22 | 2020-10-02 | 福建鸿生建材发展有限公司 | Preparation method of high polymer recycled concrete |
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Application publication date: 20210108 |