CN111847949A - Classification method for waste concrete block treatment - Google Patents
Classification method for waste concrete block treatment Download PDFInfo
- Publication number
- CN111847949A CN111847949A CN202010745926.9A CN202010745926A CN111847949A CN 111847949 A CN111847949 A CN 111847949A CN 202010745926 A CN202010745926 A CN 202010745926A CN 111847949 A CN111847949 A CN 111847949A
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- China
- Prior art keywords
- concrete blocks
- waste concrete
- aggregate
- recycled
- waste
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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
- 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
- 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
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
-
- 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
-
- 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)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a classification method for treating waste concrete blocks, which belongs to the technical field of waste concrete block treatment, wherein the waste concrete blocks are pretreated, the waste concrete blocks are heated by a microwave transmitting device after being dried in the air, the waste concrete blocks are crushed for multiple times by a crusher after being heated, and regenerated aggregates are classified, so that the regenerated coarse aggregates are used in new concrete to play a role of a framework, and the regenerated fine aggregates are used as mortar sand or filler of a gel material, and are classified for use after the waste concrete blocks are treated, so that the quantity of mined stones can be reduced to a limited extent, the environment is protected, and the stones are recycled, and the method is a sustainable generation mode which is green and economical; the recycled aggregate is classified by adopting a particle size mode, the applicable range of the recycled aggregate can be considered according to the classification standard, the recycled aggregate can be used in a more targeted manner, the difference of different regions is met, and therefore the recycled aggregate is more convenient for workers to use.
Description
Technical Field
The invention belongs to the technical field of waste concrete block treatment, and particularly relates to a classification method for waste concrete block treatment.
Background
With the updating, transformation and construction of urban public and civil buildings and municipal facilities, in the construction process, a large amount of old buildings are dismantled, so that a large amount of construction waste is generated, the construction waste in China accounts for 30-40% of the weight of the urban waste at present, according to relevant information, through rough estimation of construction material loss of buildings such as brick-concrete structures, full cast-in-place structures, frame structures and the like, in the construction process of each square meter of buildings, only 500 tons of construction waste can be generated, if the calculation is carried out, only 4000 tons of construction waste can be generated and discharged in the construction of China every year, and the construction waste especially accounts for the largest proportion of waste concrete blocks, so that the solution of most waste concrete blocks is of great importance in the recycling of construction waste.
At present, the method for treating the waste concrete blocks in China mainly comprises direct landfill or field stacking, and most of the concrete mixed by newly-repaired buildings adopts newly-mined stones, cement, sand and the like. Either the disposal of the waste concrete blocks or the production of new concrete blocks causes great environmental damage. Therefore, the waste is effectively coagulated and recycled, so that the discharge amount of the construction waste can be greatly reduced, and the environmental damage caused by stone mining can be reduced.
Although the traditional crushing method can classify waste concrete blocks into recycled aggregates, the quality of the generated recycled aggregates is poor, and the inside of the recycled aggregates contains a large number of microcracks, so that the quality of the concrete is influenced, the application range of the recycled aggregates is limited, and the practicability of the recycled aggregates is reduced.
Disclosure of Invention
Technical problem to be solved
In order to overcome the defects in the prior art, the invention provides a classification method for treating waste concrete blocks, which solves the problems that although the waste concrete blocks can be classified into recycled aggregate by the traditional crushing method, the quality of the generated recycled aggregate is poor, the interior of the recycled aggregate contains a large number of microcracks, the quality of the concrete is influenced, the application range of the recycled aggregate is limited, and the practicability of the recycled aggregate is reduced.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a sorting method for waste concrete block treatment comprises the following steps:
s1, preprocessing: and (3) pretreating the waste concrete blocks, and air-drying the pretreated concrete blocks.
S2, impurity removal: and (3) loading the pretreated concrete blocks into a crusher, performing primary crushing and secondary crushing, and removing reinforcing steel bars and glass sundries in the crushing process.
S3, reinforcing aggregate:
a. when the air-dried waste concrete blocks are crushed, the waste concrete blocks are irradiated by microwaves in advance, wherein the irradiation height is 1-1.5m, and the irradiation time is 3-6 h.
b. After microwave irradiation, crushing the treated waste concrete blocks, soaking the crushed aggregates in a dry cooling water tank for 1-3min after primary crushing and secondary crushing, and taking out the quickly soaked aggregates.
c. And the quality of the recycled aggregate is further improved by adopting a soaking strengthening method for the aggregate again, and the soaking time is 30-50 min.
S4, aggregate classification: and separating the treated aggregate into recycled coarse aggregate and recycled fine aggregate.
As a further scheme of the invention: the pretreatment is to wash the waste concrete blocks by adopting a washing mechanism, and to wash off soil and impurities in the waste concrete blocks.
As a further scheme of the invention: the microwave irradiation is to heat the waste concrete blocks by adopting a microwave transmitting device, wherein the heating temperature is 10-20 ℃/h until the temperature is heated to 100 ℃.
As a further scheme of the invention: the materials used for soaking mainly comprise polymers, organosilicon waterproofing agents and pure cement slurries.
As a further scheme of the invention: the recycled coarse aggregate is the aggregate with the particle size larger than 5mm after the waste concrete blocks are crushed, and can be used as stones in new concrete and play a role of a framework in the concrete.
As a further scheme of the invention: the recycled fine aggregate is the aggregate with the particle size smaller than 5mm after the waste concrete blocks are crushed for multiple times, and can be used as mortar sand or a filler of a gel material.
(III) advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
1. the classification method for treating the waste concrete blocks comprises the steps of pretreating the waste concrete blocks, washing out soil and impurities in the waste concrete blocks, carrying out air drying, heating the waste concrete blocks by using a microwave transmitting device after air drying, crushing the waste concrete blocks for multiple times by using a crusher after heating, clearing away reinforcing steel bars and glass impurities in the crushing process, then enhancing the quality of regenerated aggregates by soaking, and carrying out classification treatment on the regenerated aggregates, so that the regenerated coarse aggregates are used in new concrete to play a role of a framework, and the regenerated fine aggregates are used as mortar sand or filler of a gel material, are used for classification after treating the waste concrete blocks, can greatly improve the utilization value of the waste concrete blocks, can reduce mining in a limited way, protect the environment, and enable stones to be recycled, and is a sustainable stone generation mode which is green and economical.
2. The classification method for treating the waste concrete blocks comprises the steps of microwave irradiation and cooling, crushing and soaking, the waste concrete blocks are pretreated by microwaves, selective heating is carried out due to the difference of electromagnetic properties of different materials, temperature difference is caused to form enough temperature stress, coarse aggregates are separated from mortar, the tensile strength of a concrete body is reduced, and the crushing difficulty of a crushing machine is reduced, so that the coarse aggregates are not easy to damage in the picking and selecting process, the original quality of the coarse aggregates is effectively protected, the separation effect of the coarse aggregates and the mortar is excellent, the production efficiency of the recycled aggregate concrete is remarkably improved, cracks in the crushed recycled aggregates can be repaired by a soaking mode, and the performances of the recycled aggregate concrete in the aspects of compression resistance, tensile resistance and elastic modulus are further improved.
3. According to the classification method for treating the waste concrete blocks, the recycled aggregate is classified by adopting a particle size mode, the classification standard is determined, the applicable range of the recycled aggregate can be considered according to the classification standard, the recycled aggregate can be used more specifically, the difference of different regions is met, and therefore workers can use the recycled aggregate more conveniently.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
The invention provides a technical scheme that: a sorting method for waste concrete block treatment comprises the following steps:
s1, preprocessing: and (3) pretreating the waste concrete blocks, and air-drying the pretreated concrete blocks.
S2, impurity removal: and (3) loading the pretreated concrete blocks into a crusher, performing primary crushing and secondary crushing, and removing reinforcing steel bars and glass sundries in the crushing process.
S3, reinforcing aggregate:
a. when the air-dried waste concrete blocks are crushed, the waste concrete blocks are irradiated by microwaves in advance, wherein the irradiation height is 1-1.5m, and the irradiation time is 3-6 h.
b. After microwave irradiation, crushing the treated waste concrete blocks, soaking the crushed aggregates in a dry cooling water tank for 1-3min after primary crushing and secondary crushing, and taking out the quickly soaked aggregates.
c. And the quality of the recycled aggregate is further improved by adopting a soaking strengthening method for the aggregate again, and the soaking time is 30-50 min.
S4, aggregate classification: and separating the treated aggregate into recycled coarse aggregate and recycled fine aggregate.
The pretreatment is to adopt wiper mechanism to wash the abandonment concrete piece, washs earth and impurity in the abandonment concrete piece, through carrying out the pretreatment to the abandonment concrete piece, can clear up impurity wherein for the abandonment concrete piece becomes cleaner, can not cause the influence to the subsequent handling, thereby has guaranteed that the abandonment concrete piece draws the quality of regeneration aggregate.
The microwave irradiation is to heat the waste concrete blocks by adopting a microwave transmitting device, the heating temperature is 10-20 ℃/h until the temperature is heated to 100 ℃, the waste concrete blocks are heated by setting, the internal stress of the waste concrete blocks is increased by utilizing high temperature, different substances in the waste concrete blocks are guaranteed to be separated from each other during crushing, the fine damage to the interior of the waste concrete blocks is reduced, meanwhile, the temperature value is set, the temperature threshold value for heating the waste concrete blocks is determined, and the property of the recycled aggregate is prevented from being influenced by overhigh temperature.
The materials used for soaking mainly comprise a polymer, an organosilicon waterproofing agent and pure water slurry, and the polymer, the organosilicon waterproofing agent and the pure water slurry are fully filled into cracks in the recycled aggregate under the action of soaking materials, so that the cracks in the recycled aggregate can be eliminated after the polymer, the organosilicon waterproofing agent and the pure water slurry are solidified, the performance of the recycled aggregate is improved, and the application range of the recycled aggregate is enlarged.
The recycled coarse aggregate is crushed waste concrete blocks, the particle size of the crushed recycled coarse aggregate is larger than 5mm, the crushed recycled coarse aggregate can be used as stones in new concrete and plays a role of a framework in the concrete, the recycled coarse aggregate is classified, a large amount of mineral admixtures such as fly ash, mineral powder and silica fume are used for replacing cement, high-quality recycled coarse aggregate is used for replacing broken stones according to different replacement rates, a high-efficiency water reducing agent is used for reducing the water-cement ratio of the concrete, high-performance recycled coarse aggregate concrete with good workability, high strength and good durability is prepared, and the recycled coarse aggregate concrete is promoted to be widely applied to various practical projects.
The recycled fine aggregate is the aggregate with the particle size smaller than 5mm after the waste concrete blocks are crushed for multiple times, and can be used as mortar sand or filler of gel materials, the recycled fine aggregate is classified, the recycled aggregate is treated, the performance of each aspect is improved, but the recycled aggregate is still lower than that of natural aggregate, in addition, the performance of the concrete is greatly influenced by completely adopting the recycled aggregate, the fine aggregate adopts different substitution rates, and the coarse aggregate is completely prepared by adopting natural crushed stone.
Through carrying out the preliminary treatment to abandonment concrete piece, wash out earth and impurity wherein, air-dry, utilize microwave emitter to heat abandonment concrete piece after the air-dry, adopt the breaker to carry out a lot of breakage to it after the heating, reinforcing bar and glass debris are cleared up to the broken in-process, then strengthen the quality of regeneration aggregate through soaking the mode, and carry out classification to regeneration aggregate, make regeneration coarse aggregate play the effect of skeleton in being arranged in new concrete, and regeneration fine aggregate is as mortar grit or as the filler of advancing gel material, classifying use after handling abandonment concrete piece, can improve its value of utilization greatly, can the limited reduction exploit building stones, the environmental protection, let building stones reuse, be a sustainable emergence mode of green economy.
Through setting up microwave irradiation and cooling, breakage and soaking three step, utilize the microwave to carry out preliminary treatment to the discarded concrete piece, selective heating is carried out owing to the difference of different material electromagnetic properties, cause the temperature difference to form enough big temperature stress, make coarse aggregate and mortar separation, concrete body tensile strength descends, broken mechanical crushing degree of difficulty has been reduced, thereby make coarse aggregate be difficult for taking place the damage in the picking process, the original quality of coarse aggregate has effectively been protected, and coarse aggregate is excellent with the mortar separation effect, the production efficiency of regeneration aggregate concrete has been showing to be promoted, and the soaking mode can be restoreed the crackle inside the regeneration aggregate after the breakage, further improve the performance of regeneration aggregate concrete in the aspect of resistance to compression, tensile and elastic modulus.
The recycled aggregate is classified by adopting a particle size mode, the classification standard is determined, the applicable range of the recycled aggregate can be considered according to the classification standard, the recycled aggregate can be used in a more targeted manner, the difference of different regions is met, and therefore the recycled aggregate is more convenient for workers to use.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (6)
1. A classification method for waste concrete block treatment is characterized in that: the method comprises the following steps:
s1, preprocessing: pretreating the waste concrete blocks, and air-drying the pretreated concrete blocks;
s2, impurity removal: loading the pretreated concrete blocks into a crusher, performing primary crushing and secondary crushing, and removing reinforcing steel bars and glass sundries in the crushing process;
s3, reinforcing aggregate:
a. when the air-dried waste concrete blocks are crushed, the waste concrete blocks are irradiated by microwaves in advance, wherein the irradiation height is 1-1.5m, and the irradiation time is 3-6 h;
b. after microwave irradiation, crushing the treated waste concrete blocks, soaking the crushed aggregates in a dry cooling water tank for 1-3min after primary crushing and secondary crushing, and taking out the quickly soaked aggregates;
c. the quality of the recycled aggregate is further improved by adopting a soaking strengthening method again, and the soaking time is 30-50 min;
s4, aggregate classification: and screening the treated aggregate into recycled coarse aggregate and recycled fine aggregate by using a screening mechanism.
2. The method of sorting waste concrete blocks according to claim 1, wherein: the pretreatment is to wash the waste concrete blocks by adopting a washing mechanism, and to wash off soil and impurities in the waste concrete blocks.
3. The method of sorting waste concrete blocks according to claim 1, wherein: the microwave irradiation is to heat the waste concrete blocks by adopting a microwave transmitting device, wherein the heating temperature is 10-20 ℃/h until the temperature is heated to 100 ℃.
4. The method of sorting waste concrete blocks according to claim 1, wherein: the materials used for soaking mainly comprise polymers, organosilicon waterproofing agents and pure cement slurries.
5. The method of sorting waste concrete blocks according to claim 1, wherein: the recycled coarse aggregate is the aggregate with the particle size larger than 5mm after the waste concrete blocks are crushed, and can be used as stones in new concrete and play a role of a framework in the concrete.
6. The method of sorting waste concrete blocks according to claim 1, wherein: the recycled fine aggregate is the aggregate with the particle size smaller than 5mm after the waste concrete blocks are crushed for multiple times, and can be used as mortar sand or a filler of a gel material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010745926.9A CN111847949A (en) | 2020-07-29 | 2020-07-29 | Classification method for waste concrete block treatment |
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| CN202010745926.9A CN111847949A (en) | 2020-07-29 | 2020-07-29 | Classification method for waste concrete block treatment |
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| CN111847949A true CN111847949A (en) | 2020-10-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624674A (en) * | 2020-12-23 | 2021-04-09 | 东莞市建业混凝土有限公司 | High-strength recycled concrete and preparation method thereof |
| CN112976286A (en) * | 2021-03-25 | 2021-06-18 | 王云芳 | Preparation method of interlocking structure brick |
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| CN110104978A (en) * | 2019-05-23 | 2019-08-09 | 南通大学 | A kind of device of microwave-assisted broken varying strength discarded concrete |
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2020
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Patent Citations (5)
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| US4619550A (en) * | 1984-10-05 | 1986-10-28 | Cd High Technology, Inc. | Microwave method and apparatus for heating loose paving materials |
| CN102503197A (en) * | 2011-10-19 | 2012-06-20 | 武汉理工大学 | Cement concrete recycling method |
| CN105776930A (en) * | 2016-05-23 | 2016-07-20 | 西安科技大学 | Microwave-assisted recycled concrete coarse aggregate picking method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624674A (en) * | 2020-12-23 | 2021-04-09 | 东莞市建业混凝土有限公司 | High-strength recycled concrete and preparation method thereof |
| CN112976286A (en) * | 2021-03-25 | 2021-06-18 | 王云芳 | Preparation method of interlocking structure brick |
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Application publication date: 20201030 |