CN113149539A - Preparation method of recycled concrete with high recovery rate - Google Patents
Preparation method of recycled concrete with high recovery rate Download PDFInfo
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- CN113149539A CN113149539A CN202110618405.1A CN202110618405A CN113149539A CN 113149539 A CN113149539 A CN 113149539A CN 202110618405 A CN202110618405 A CN 202110618405A CN 113149539 A CN113149539 A CN 113149539A
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
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Abstract
The invention discloses a preparation method of recycled concrete with high recovery rate, which comprises the following steps: the method comprises the following steps: processing waste concrete blocks and other raw materials; step two: screening the raw materials; step three: weighing raw materials; step four: and (2) mixing the raw materials to prepare the recycled concrete, wherein when the waste concrete blocks are treated in the step one, the large waste concrete blocks are firstly crushed into small blocks. By adding quartz sand, perlite and tetrafluoroethylene into the raw materials, the shock resistance of the recycled concrete is effectively improved, so that the recycled concrete has a wider application range and a longer service life; the main raw materials are waste concrete blocks and waste fibers, wherein the waste fibers are extracted from waste tires, so that the recycling rate of wastes is effectively improved; by adding the waste fibers into the raw materials, the overall toughness of the prepared recycled concrete can be effectively enhanced and the possibility of fracture is reduced while the waste fibers are fully utilized.
Description
Technical Field
The invention relates to the technical field of recycled concrete correlation, in particular to a preparation method of recycled concrete with high recovery rate.
Background
Along with the rapid development of the construction industry, the quantity of construction wastes is gradually increased, and the construction wastes are recycled, so that the environmental problem caused by stacking of the wastes can be reduced, and the resources can be saved, therefore, the effective treatment of the construction wastes is particularly important, most of the construction wastes contain a large amount of waste concrete, and the waste concrete is used as a raw material to produce, process and regenerate the concrete, thereby being an environment-friendly and economic construction wastes treatment mode.
However, the existing recycled concrete preparation method still has certain defects, such as:
the authorization notice number is: CN103864357B, the date of authorized announcement is: 2016.05.11 'A premixed recycled concrete and a preparation method thereof', the premixed recycled concrete disclosed by the invention is characterized in that each cubic of premixed concrete is composed of the following raw materials by weight: 133-162 kg of 42.5 grade cement, 300-327 kg of first yellow sand, 571-608 kg of second yellow sand, 387-404 kg of natural stones, 527-547 kg of recycled coarse aggregate, 71-80 kg of fly ash, 2.66-3.20 kg of additive, 129-160 kg of mineral powder and 122-126 kg of water, wherein the slump of the premixed recycled concrete is 120 +/-30 mm. The preparation method of the premixed recycled concrete comprises the steps of adding first yellow sand, second yellow sand, mineral powder, 42.5-grade cement and fly ash according to the feeding sequence, stirring for 20 seconds, adding natural stones and recycled coarse aggregate, stirring for 20 seconds, finally adding water and additives, and stirring for 60 seconds to obtain the mixer. The mixing amount of the recycled coarse aggregate in the premixed concrete with the strength grade of C30 of the premixed recycled concrete can reach 100 percent, and the mixing amount of the recycled coarse aggregate in the premixed concrete with the strength grade of C40 of the premixed recycled concrete can reach 50 percent.
If the authorization notice number is: CN102887679B, the date of authorized announcement is: 2014.12.03, a preparation method of high-strength fully-recycled coarse aggregate concrete, and a preparation method of the high-strength fully-recycled coarse aggregate concrete, belonging to the technical field of recycled coarse aggregate concrete. According to the invention, a proper amount of high-efficiency water reducing agent, first-grade fly ash and mineral powder are added, and the high-performance fully-recycled coarse aggregate concrete with good workability, high early strength and good later strength development can be prepared at a water-to-gel ratio of 0.36-0.44. The strength of the existing fully recycled coarse aggregate concrete is lower, and the actual measurement of the fully recycled coarse aggregate concrete of the invention for 28 days shows that the compressive strength is over 50 Mpa.
However, in the above prior art, the prepared recycled concrete has weak shock resistance, which affects the service life of the recycled concrete, and the recovery rate of the waste is low during the production and preparation process, so we propose a recycled concrete preparation method with high recovery rate, so as to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a preparation method of recycled concrete with high recovery rate, and aims to solve the problems that the recycled concrete prepared by the preparation method of recycled concrete in the background art has weak shock resistance, so that the service life of the recycled concrete is influenced, and the recovery rate of wastes is low in the production and preparation process.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of recycled concrete with high recovery rate comprises the following steps:
the method comprises the following steps: processing waste concrete blocks and other raw materials;
step two: screening the raw materials;
step three: weighing raw materials;
step four: mixing the raw materials to prepare the recycled concrete.
Preferably, when the waste concrete blocks are treated in the step one, the large waste concrete blocks are firstly crushed into small blocks, reinforcing steel bars inserted into the waste concrete blocks are taken out, the small waste concrete blocks are crushed into particles by using a crusher, metal impurities in the waste concrete particles are removed by using an electromagnet, and wood impurities and foam impurities in the waste concrete particles are removed by adopting a water immersion filtering mode to prepare the concrete aggregate.
Preferably, the concrete aggregate prepared in the first step is completely soaked in tap water for 4 hours, the concrete aggregate is taken out after soaking, and then the concrete aggregate is put into a dryer and baked at the temperature of 120-150 ℃ while stirring, and the baking time is 50 minutes, so that the dry concrete aggregate is obtained.
Preferably, the processing of other raw materials in the step one further comprises: the waste fibers are cut and crushed to be processed into crushed materials.
Preferably, the waste fibers treated in the step one are nylon fibers, polypropylene three-branch anti-aging reticular fibers and modified polypropylene crude TANK fibers, wherein the nylon fibers, the polypropylene three-branch anti-aging reticular fibers and the modified polypropylene crude TANK fibers are extracted from waste tires.
Preferably, the screening raw materials in the second step mainly comprise: and screening and filtering the crushed waste concrete blocks and the crushed waste fiber crushed aggregates by a filter screen, wherein the particle size of the screened waste concrete blocks is within the range of 5-20mm, and the length of the waste fiber crushed aggregates is within the range of 15-30mm for later use.
Preferably, the weighing of the raw materials in the third step mainly comprises: concrete aggregate, waste fiber crushed aggregates, slag, fly ash, natural broken stone, quartz sand, perlite, tetrafluoroethylene, a water reducing agent and water;
wherein the weighed raw materials are respectively as follows: 150 parts of concrete aggregate, 38 parts of waste fiber crushed aggregates, 20-30 parts of slag, 10-15 parts of fly ash, 25-30 parts of natural crushed stone, 5-8 parts of quartz sand, 8-10 parts of perlite, 3-5 parts of tetrafluoroethylene, 12-15 parts of a water reducing agent and a proper amount of water.
Preferably, the mixing of the raw materials in the fourth step is mainly completed by the following steps:
step a: firstly, sequentially adding concrete aggregate, waste fiber crushed aggregates, slag powder, coal ash, natural crushed stone, quartz sand and perlite into a stirrer, starting the stirrer, and stirring at a low speed until the concrete aggregate, the waste fiber crushed aggregates, the slag powder, the coal ash, the natural crushed stone, the quartz sand and the perlite are uniformly mixed;
step b: adding a proper amount of water into the stirrer, and stirring and adding the water into the stirrer at a low speed;
step c: sequentially adding tetrafluoroethylene and a water reducing agent into the stirrer, starting the stirrer, and stirring at a high speed until the materials are completely and uniformly mixed to prepare the recycled concrete.
Compared with the prior art, the invention has the beneficial effects that: the preparation method of the recycled concrete with high recovery rate comprises the following steps:
1. by adding quartz sand, perlite and tetrafluoroethylene into the raw materials, the shock resistance of the recycled concrete is effectively improved, so that the recycled concrete has a wider application range and a longer service life;
2. during preparation, main raw materials come from waste concrete blocks and waste fibers, wherein the waste fibers are extracted from waste tires, so that the recycling rate of wastes is effectively improved;
3. by adding the waste fibers into the raw materials, the overall toughness of the prepared recycled concrete can be effectively enhanced while the waste gas fibers are fully utilized, the possibility of fracture is reduced, and the service life is effectively prolonged.
Drawings
FIG. 1 is a schematic view of the preparation process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a preparation method of recycled concrete with high recovery rate comprises the following steps:
the method comprises the following steps: processing waste concrete blocks and other raw materials;
step two: screening the raw materials;
step three: weighing raw materials;
step four: mixing the raw materials to prepare the recycled concrete.
Furthermore, when the waste concrete blocks are treated in the step one, large waste concrete blocks are firstly crushed into small blocks, reinforcing steel bars inserted into the waste concrete blocks are taken out, the small waste concrete blocks are crushed into particles by using a crusher, metal impurities in the waste concrete particles are removed by using an electromagnet, and wooden impurities and foam impurities in the waste concrete particles are removed by adopting a water immersion filtering mode to prepare the concrete aggregate.
Furthermore, the concrete aggregate prepared in the first step is completely soaked in tap water for 4 hours, the concrete aggregate is taken out after soaking, and then the concrete aggregate is put into a dryer to be baked at the temperature of 120-150 ℃ and stirred at the same time, and the baking time is 50 minutes, so that the dry concrete aggregate is obtained.
Further, the step one of treating other raw materials further comprises the following steps: the waste fibers are cut and crushed to be processed into crushed materials.
The waste fiber treated in the step one is one of nylon fiber, polypropylene three-branch anti-aging reticular fiber and modified polypropylene crude TANK fiber, wherein the nylon fiber, the polypropylene three-branch anti-aging reticular fiber and the modified polypropylene crude TANK fiber are extracted from waste tires.
The invention further provides that the screening raw materials in the second step mainly comprise: and screening and filtering the crushed waste concrete blocks and the crushed waste fiber crushed aggregates by a filter screen, wherein the particle size of the screened waste concrete blocks is within the range of 5-20mm, and the length of the waste fiber crushed aggregates is within the range of 15-30mm for later use.
The invention further provides the following raw materials weighed in the third step: concrete aggregate, waste fiber crushed aggregates, slag, fly ash, natural broken stone, quartz sand, perlite, tetrafluoroethylene, a water reducing agent and water;
wherein the weighed raw materials are respectively as follows: 150 parts of concrete aggregate, 38 parts of waste fiber crushed aggregates, 20-30 parts of slag, 10-15 parts of fly ash, 25-30 parts of natural crushed stone, 5-8 parts of quartz sand, 8-10 parts of perlite, 3-5 parts of tetrafluoroethylene, 12-15 parts of a water reducing agent and a proper amount of water.
Furthermore, the raw material mixing in the fourth step is mainly completed by the following steps:
step a: firstly, sequentially adding concrete aggregate, waste fiber crushed aggregates, slag powder, coal ash, natural crushed stone, quartz sand and perlite into a stirrer, starting the stirrer, and stirring at a low speed until the concrete aggregate, the waste fiber crushed aggregates, the slag powder, the coal ash, the natural crushed stone, the quartz sand and the perlite are uniformly mixed;
step b: adding a proper amount of water into the stirrer, and stirring and adding the water into the stirrer at a low speed;
step c: sequentially adding tetrafluoroethylene and a water reducing agent into the stirrer, starting the stirrer, and stirring at a high speed until the materials are completely and uniformly mixed to prepare the recycled concrete.
Example 1:
firstly, sequentially adding 130 parts of concrete aggregate, 38 parts of waste fiber crushed aggregates, 20 parts of slag powder, 12 parts of fly ash, 25 parts of natural crushed stone, 5 parts of quartz sand and 8 parts of perlite into a stirrer, starting the stirrer, and stirring at a low speed until the concrete aggregate, the waste fiber crushed aggregates, the slag powder, the coal ash, the natural crushed stone, the quartz sand and the perlite are uniformly mixed;
then slowly adding a proper amount of water into the stirrer, and keeping the stirrer stirring at a low speed;
and finally, sequentially adding tetrafluoroethylene 3 and a water reducing agent 12 into the stirrer, starting the stirrer, and stirring at a high speed until the materials are completely and uniformly mixed to obtain the recycled concrete.
Example 2:
firstly, sequentially adding 140 parts of concrete aggregate, 38 parts of waste fiber crushed aggregates, 25 parts of slag powder, 15 parts of fly ash, 30 parts of natural crushed stone, 6 parts of quartz sand and 10 parts of perlite into a stirrer, starting the stirrer, and stirring at a low speed until the concrete aggregate, the waste fiber crushed aggregates, the slag powder, the coal ash, the natural crushed stone, the quartz sand and the perlite are uniformly mixed;
then slowly adding a proper amount of water into the stirrer, and keeping the stirrer stirring at a low speed;
and finally, sequentially adding tetrafluoroethylene 5 and a water reducing agent 15 into the stirrer, starting the stirrer, and stirring at a high speed until the materials are completely and uniformly mixed to obtain the recycled concrete.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, and the details are not described, and the content not described in detail in the specification belongs to the prior art known by persons skilled in the art.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (8)
1. A preparation method of recycled concrete with high recovery rate is characterized by comprising the following steps: the preparation method of the recycled concrete comprises the following steps:
the method comprises the following steps: processing waste concrete blocks and other raw materials;
step two: screening the raw materials;
step three: weighing raw materials;
step four: mixing the raw materials to prepare the recycled concrete.
2. The method for producing recycled concrete with high recovery rate according to claim 1, wherein: when the waste concrete blocks are treated in the first step, the large waste concrete blocks are firstly crushed into small blocks, reinforcing steel bars inserted in the waste concrete blocks are taken out, the small waste concrete blocks are crushed into particles by using a crusher, metal impurities in the waste concrete particles are removed by using an electromagnet, and wood impurities and foam impurities in the waste concrete particles are removed by adopting a water immersion filtering mode to prepare the concrete aggregate.
3. The method for producing recycled concrete with high recovery rate according to claim 2, wherein: and (2) completely soaking the concrete aggregate prepared in the step one in tap water for 4 hours, taking out the concrete aggregate after soaking, putting the concrete aggregate into a dryer, baking at the temperature of 120-150 ℃, stirring while baking, and baking for 50 minutes to obtain the dried concrete aggregate.
4. The method for producing recycled concrete with high recovery rate according to claim 1, wherein: the step one of processing other raw materials further comprises the following steps: the waste fibers are cut and crushed to be processed into crushed materials.
5. The method for producing recycled concrete with high recovery rate according to claim 4, wherein: the waste fibers treated in the step one are nylon fibers, polypropylene three-branch anti-aging reticular fibers and modified polypropylene crude TANK fibers, wherein the nylon fibers, the polypropylene three-branch anti-aging reticular fibers and the modified polypropylene crude TANK fibers are extracted from waste tires.
6. The method for producing recycled concrete with high recovery rate according to claim 1, wherein: the screening raw materials in the second step mainly comprise: and screening and filtering the crushed waste concrete blocks and the crushed waste fiber crushed aggregates by a filter screen, wherein the particle size of the screened waste concrete blocks is within the range of 5-20mm, and the length of the waste fiber crushed aggregates is within the range of 15-30mm for later use.
7. The method for producing recycled concrete with high recovery rate according to claim 1, wherein: the weighing of the raw materials in the third step mainly comprises the following steps: concrete aggregate, waste fiber crushed aggregates, slag, fly ash, natural broken stone, quartz sand, perlite, tetrafluoroethylene, a water reducing agent and water;
wherein the weighed raw materials are respectively as follows: 150 parts of concrete aggregate, 38 parts of waste fiber crushed aggregates, 20-30 parts of slag, 10-15 parts of fly ash, 25-30 parts of natural crushed stone, 5-8 parts of quartz sand, 8-10 parts of perlite, 3-5 parts of tetrafluoroethylene, 12-15 parts of a water reducing agent and a proper amount of water.
8. The method for producing recycled concrete with high recovery rate according to claim 1, wherein: the step four, mixing the raw materials, mainly comprises the following steps:
step a: firstly, sequentially adding concrete aggregate, waste fiber crushed aggregates, slag powder, fly ash, natural crushed stone, quartz sand and perlite into a stirrer, starting the stirrer, and stirring at a low speed until the concrete aggregate, the waste fiber crushed aggregates, the slag powder, the coal ash, the natural crushed stone, the quartz sand and the perlite are uniformly mixed;
step b: adding a proper amount of water into the stirrer, and stirring and adding the water into the stirrer at a low speed;
step c: sequentially adding tetrafluoroethylene and a water reducing agent into the stirrer, starting the stirrer, and stirring at a high speed until the materials are completely and uniformly mixed to prepare the recycled concrete.
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Cited By (1)
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| CN115611572A (en) * | 2022-09-22 | 2023-01-17 | 重庆渝隆远大住宅工业有限公司 | Concrete preparation method for recycling waste concrete blocks |
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