CN111825415A - Secondary processing and utilizing process for waste concrete blocks - Google Patents
Secondary processing and utilizing process for waste concrete blocks Download PDFInfo
- Publication number
- CN111825415A CN111825415A CN202010747089.3A CN202010747089A CN111825415A CN 111825415 A CN111825415 A CN 111825415A CN 202010747089 A CN202010747089 A CN 202010747089A CN 111825415 A CN111825415 A CN 111825415A
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- CN
- China
- Prior art keywords
- concrete blocks
- waste
- waste concrete
- materials
- secondary processing
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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
- C04B28/24—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 containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- 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
Abstract
The invention discloses a secondary processing and utilizing process for waste concrete blocks, belonging to the technical field of concrete recovery, and comprising the following steps of: s1, pre-treating the waste concrete blocks, namely washing the waste concrete blocks, crushing the waste concrete blocks and removing waste iron materials in the crushed concrete blocks. This abandonment concrete piece utilizes technology with secondary operation, abandonment concrete piece is at first washd and is got rid of surface debris and mud, then carry out subsequent breakage, smash and the screening process, wash the processing once more after the screening simultaneously, then carry out processes such as raw materials mixing stirring and hollow brick shaping, realize the recycle once more to abandonment concrete piece, and can avoid bringing debris and mud into subsequent hollow brick processing step, can guarantee to a certain extent that the adhesion between each component of raw materials is more ideal, make the processingquality of hollow brick comparatively ideal, can realize resource recycle simultaneously, and pollution abatement.
Description
Technical Field
The invention belongs to the technical field of concrete recovery, and particularly relates to a secondary processing and utilizing process for waste concrete blocks.
Background
At present, the economy of China is rapidly developed, and urban public and civil buildings and municipal facilities are greatly updated and reformed. In the construction process, a large amount of old buildings are dismantled, so that a large amount of construction waste is generated, and the amount of the construction waste in China accounts for 30-40% of the total amount of urban waste. With the continuous development of cities, on one hand, environmental problems caused by construction waste are more and more serious, and on the other hand, the continuous use of commercial concrete raw materials consumes a large amount of mineral resources, thereby influencing the environment. Therefore, the recycling of waste commercial concrete is an important subject for saving energy and resources, protecting human living environment and developing sustainable roads, and high attention should be paid.
In the research and study of the development report of the Chinese construction waste recycling industry in 2014, the recycling rate of the construction waste in China is only about 5%. Most recycled concrete is directly buried or even illegally stacked, and 10000 tons of waste concrete need 67 square meters of land for stacking, so that land resource waste is serious, and dust flies in the clearing and stacking processes to cause environmental pollution, so that the problem needs to be solved by a secondary processing and utilizing process for waste concrete blocks.
Disclosure of Invention
Technical problem to be solved
In order to overcome the defects in the prior art, the invention provides a secondary processing and utilizing process for waste concrete blocks, and solves the problems that the existing waste concrete block building garbage is directly stacked, more land resources are occupied, dust flies in the transferring process, and the environment is polluted.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a secondary processing and utilizing process for waste concrete blocks comprises the following steps:
s1, pretreating the waste concrete blocks, namely washing the waste concrete blocks, crushing the waste concrete blocks, removing waste iron materials in the crushed concrete blocks, and removing light materials such as wood materials, plastics, woven materials and the like in the crushed concrete blocks;
s2, screening broken concrete blocks, and putting the broken concrete blocks into a crusher for crushing;
s3, calcining the crushed material, namely calcining the crushed material in a calcining furnace at 940 ℃ for 40-60min, and taking out the calcined material by a worker for natural cooling;
s4, screening raw materials, and screening the crushed materials to obtain coarse aggregate and fine aggregate;
s5, cleaning, namely cleaning the obtained raw materials again to remove mud;
s6, selecting materials, namely selecting the following raw materials to obtain a hollow brick mixed raw material;
coarse aggregate, 200-;
fine aggregate, 100-;
cement, 285- & 500;
50-80 parts of inorganic adhesive;
other additives, 8-30;
s7, stirring and forming, wherein the raw materials are fully stirred and mixed and then are formed by pressure;
and S8, curing and demolding, curing the molded semi-finished product at room temperature for 1-3 days, and demolding to take off the finished product.
As a further scheme of the invention: and after the waste concrete blocks in the S1 are washed, the waste concrete blocks are dried at the temperature of 120-150 ℃, impact crushers are adopted in the crushing processes in the S1 and the S2, a magnetic separator is adopted in the process of removing iron waste in the S1, and a horizontal wind power separator is adopted for removing light materials such as wood, plastics, woven materials and the like.
As a further scheme of the invention: the inorganic adhesive in the S6 adopts one or more than one of water glass or borate, and other additives adopt water reducing agent or early strength agent.
As a further scheme of the invention: the pressure in the pressure forming process in the S7 needs to reach more than 10 MPa.
As a further scheme of the invention: before stirring and forming in the S7, the ingredients are ground and sieved to keep the ingredients at 150-220 meshes.
As a further scheme of the invention: in the step S3, the crushed material is calcined, so that the inside of the calcined concrete is decomposed more thoroughly, the bonding strength is more ideal when the crushed material is used as aggregate, and the larger the diameter of the crushed material is, the longer the required calcination time is.
(III) advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
1. this abandonment concrete piece utilizes technology with secondary operation, abandonment concrete piece is at first washd and is got rid of surface debris and mud, then carry out subsequent breakage, smash and the screening process, wash the processing once more after the screening simultaneously, then carry out processes such as raw materials mixing stirring and hollow brick shaping, realize the recycle once more to abandonment concrete piece, and can avoid bringing debris and mud into subsequent hollow brick processing step, adopt the mode of calcining to handle the concrete simultaneously, can guarantee to a certain extent that the adhesion between each component of raw materials is more ideal, make the processingquality and the intensity of hollow brick comparatively ideal, can realize the resource recycle simultaneously, reduce pollution.
2. The secondary processing and utilizing process for the waste concrete blocks adopts the early strength agent as other additives, can accelerate the hydration speed of cement, promotes the early strength of concrete, and has no obvious influence on the later strength, thereby ensuring the forming rate of the manufacturing process of the hollow brick.
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 secondary processing and utilizing process for waste concrete blocks comprises the following steps:
s1, pretreating the waste concrete blocks, namely washing the waste concrete blocks, crushing the waste concrete blocks, removing waste iron materials in the crushed concrete blocks, and removing light materials such as wood materials, plastics, woven materials and the like in the crushed concrete blocks;
s2, screening broken concrete blocks, and putting the broken concrete blocks into a crusher for crushing;
s3, calcining the crushed material, namely calcining the crushed material in a calcining furnace at 940 ℃ for 40-60min, and taking out the calcined material by a worker for natural cooling;
s4, screening raw materials, and screening the crushed materials to obtain coarse aggregate and fine aggregate;
s5, cleaning, namely cleaning the obtained raw materials again to remove mud;
s6, selecting materials, namely selecting the following raw materials to obtain a hollow brick mixed raw material;
coarse aggregate, 200-;
fine aggregate, 100-;
cement, 285- & 500;
50-80 parts of inorganic adhesive;
other additives, 8-30;
s7, stirring and forming, wherein the raw materials are fully stirred and mixed and then are formed by pressure;
and S8, curing and demolding, curing the molded semi-finished product at room temperature for 1-3 days, and demolding to take off the finished product.
After the waste concrete blocks in the S1 are washed, the waste concrete blocks are dried at the temperature of 120-150 ℃, impact crushers are adopted in the crushing processes in the S1 and the S2, a magnetic separator is adopted in the process of removing iron waste in the S1, and a horizontal wind power separator is adopted for removing light materials such as wood, plastics, woven materials and the like.
In S6, one or more of water glass and borate is adopted as the inorganic adhesive, and a water reducing agent or an early strength agent is adopted as the other additive, so that the water reducing agent can increase the hydration efficiency, reduce the unit water consumption, increase the strength and save the cement consumption; improving workability, preventing segregation of ingredients; the impermeability and the water permeability of the water are improved, the water leakage of the building structure is avoided, the durability is improved, and the chemical corrosion resistance is improved; the shrinkage rate of concrete solidification is reduced, and the concrete member is prevented from generating cracks; the anti-freezing performance is improved, the construction in winter is facilitated, the early strength agent is used as other additives, the cement hydration speed can be accelerated, the early strength of concrete is promoted, and the later strength is not obviously affected, so that the forming rate of the hollow brick in the manufacturing process can be ensured.
The pressure in the pressure forming process in S7 needs to reach more than 10 MPa.
Before stirring and forming in S7, the ingredients are ground and sieved to keep the ingredients at 150-220 meshes.
And calcining the crushed material in S3, so that the inside of the calcined concrete is decomposed more thoroughly, the bonding strength is more ideal when the calcined concrete is used as an aggregate, and the larger the diameter of the crushed material is, the longer the required calcining time is.
And the waste concrete is cleaned twice in S1 and S5, so that dust and impurities on the surface of the waste concrete are fully cleaned for the first time, and dust and impurities adhered to gaps on the surface of the waste concrete can be cleaned again for the second time, the impurities and dust contained in the aggregate are fully reduced, and the ideal adhesion between the aggregate and other raw materials is ensured.
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 secondary processing and utilizing process for waste concrete blocks is characterized by comprising the following steps:
s1, pretreating the waste concrete blocks, namely washing the waste concrete blocks, crushing the waste concrete blocks, removing waste iron materials in the crushed concrete blocks, and removing light materials such as wood materials, plastics, woven materials and the like in the crushed concrete blocks;
s2, screening broken concrete blocks, and putting the broken concrete blocks into a crusher for crushing;
s3, calcining the crushed material, namely calcining the crushed material in a calcining furnace at 940 ℃ for 40-60min, and taking out the calcined material by a worker for natural cooling;
s4, screening raw materials, and screening the crushed materials to obtain coarse aggregate and fine aggregate;
s5, cleaning, namely cleaning the obtained raw materials again to remove mud;
s6, selecting materials, namely selecting the following raw materials to obtain a hollow brick mixed raw material;
coarse aggregate, 200-;
fine aggregate, 100-;
cement, 285- & 500;
50-80 parts of inorganic adhesive;
other additives, 8-30;
s7, stirring and forming, wherein the raw materials are fully stirred and mixed and then are formed by pressure;
and S8, curing and demolding, curing the molded semi-finished product at room temperature for 1-3 days, and demolding to take off the finished product.
2. The secondary processing and utilizing process for the waste concrete blocks as claimed in claim 1, wherein: and after the waste concrete blocks in the S1 are washed, the waste concrete blocks are dried at the temperature of 120-150 ℃, impact crushers are adopted in the crushing processes in the S1 and the S2, a magnetic separator is adopted in the process of removing iron waste in the S1, and a horizontal wind power separator is adopted for removing light materials such as wood, plastics, woven materials and the like.
3. The secondary processing and utilizing process for the waste concrete blocks as claimed in claim 1, wherein: the inorganic adhesive in the S6 adopts one or more than one of water glass or borate, and other additives adopt water reducing agent or early strength agent.
4. The secondary processing and utilizing process for the waste concrete blocks as claimed in claim 1, wherein: the pressure in the pressure forming process in the S7 needs to reach more than 10 MPa.
5. The secondary processing and utilizing process for the waste concrete blocks as claimed in claim 1, wherein: before stirring and forming in the S7, the ingredients are ground and sieved to keep the ingredients at 150-220 meshes.
6. The secondary processing and utilizing process for the waste concrete blocks as claimed in claim 1, wherein: in the step S3, the crushed material is calcined, so that the inside of the calcined concrete is decomposed more thoroughly, the bonding strength is more ideal when the crushed material is used as aggregate, and the larger the diameter of the crushed material is, the longer the required calcination time is.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747089.3A CN111825415A (en) | 2020-07-29 | 2020-07-29 | Secondary processing and utilizing process for waste concrete blocks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747089.3A CN111825415A (en) | 2020-07-29 | 2020-07-29 | Secondary processing and utilizing process for waste concrete blocks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111825415A true CN111825415A (en) | 2020-10-27 |
Family
ID=72920392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010747089.3A Pending CN111825415A (en) | 2020-07-29 | 2020-07-29 | Secondary processing and utilizing process for waste concrete blocks |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139193A (en) * | 2007-08-21 | 2008-03-12 | 云南华威废弃物资源化有限公司 | Regenerative concrete composite material and method for making same |
| CN101215114A (en) * | 2007-12-27 | 2008-07-09 | 哈尔滨工业大学 | Method for producing regenerated aggregate and regenerated cement from discarded concrete |
| KR20080114459A (en) * | 2007-06-26 | 2008-12-31 | 대흥에코 주식회사 | Apparatus for processing waste of construction |
| CN109675906A (en) * | 2018-11-28 | 2019-04-26 | 东莞理工学院 | A kind of wholly-owned source recycling and reusing system of building castoff |
-
2020
- 2020-07-29 CN CN202010747089.3A patent/CN111825415A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080114459A (en) * | 2007-06-26 | 2008-12-31 | 대흥에코 주식회사 | Apparatus for processing waste of construction |
| CN101139193A (en) * | 2007-08-21 | 2008-03-12 | 云南华威废弃物资源化有限公司 | Regenerative concrete composite material and method for making same |
| CN101215114A (en) * | 2007-12-27 | 2008-07-09 | 哈尔滨工业大学 | Method for producing regenerated aggregate and regenerated cement from discarded concrete |
| CN109675906A (en) * | 2018-11-28 | 2019-04-26 | 东莞理工学院 | A kind of wholly-owned source recycling and reusing system of building castoff |
Non-Patent Citations (1)
| Title |
|---|
| 阮承祥: "《混凝土外加剂及其工程应用》", 31 December 2008, 江西科学技术出版社 * |
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Application publication date: 20201027 |
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| RJ01 | Rejection of invention patent application after publication |