CN112939500A - Pre-wetting strengthening process of recycled fine aggregate, strengthened recycled fine aggregate and mechanical spraying plastering mortar prepared from strengthened recycled fine aggregate - Google Patents
Pre-wetting strengthening process of recycled fine aggregate, strengthened recycled fine aggregate and mechanical spraying plastering mortar prepared from strengthened recycled fine aggregate Download PDFInfo
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- CN112939500A CN112939500A CN202110050223.9A CN202110050223A CN112939500A CN 112939500 A CN112939500 A CN 112939500A CN 202110050223 A CN202110050223 A CN 202110050223A CN 112939500 A CN112939500 A CN 112939500A
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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
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
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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
- C04B20/10—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
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00508—Cement paints
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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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Abstract
The invention discloses a pre-wetting strengthening process of recycled fine aggregate, strengthened recycled fine aggregate and mechanical spraying plastering mortar prepared from the strengthened recycled fine aggregate, which comprises the steps of crushing building garbage, shaping and sanding to obtain II-class recycled fine aggregate, mixing the II-class recycled fine aggregate with natural aggregate, carrying out pre-wetting homogenization treatment until the water content is 5-8% to obtain strengthened recycled aggregate, and drying the strengthened recycled aggregate until the water content is within 0.5%. The reinforced recycled fine aggregate produced by the method can be used for producing mechanical spraying plastering mortar by 100 percent, the utilization rate of the recycled aggregate is greatly improved, a large amount of construction waste is consumed, and the mechanical spraying plastering mortar prepared by using the reinforced recycled fine aggregate also has the characteristics of high strength, cracking resistance, light weight, environmental protection, low water absorption rate and the like.
Description
Technical Field
The invention relates to the field of building materials, in particular to a pre-wetting strengthening process of recycled fine aggregate, strengthened recycled fine aggregate and mechanical spraying plastering mortar prepared from the strengthened recycled fine aggregate.
Background
At present, most of the construction wastes are only waste metal, waste plastic, paper or plastic waste packing boxes and the like which are disassembled, and are recycled as waste products, and most of the rest wastes are collected and discharged in a mixed mode. Later, researches on the aspect of resource treatment of construction recycling waste are gradually carried out, but the researches are not ideal, so that the current disposal mode of engineering waste, demolition waste, decoration waste and road waste is still basically in the primary stage. According to preliminary statistics, the backfill of the construction site accounts for more than 70 percent, the landfill disposal of the digestion site accounts for 20 percent, and the resource utilization (namely, the construction waste is utilized to produce regenerated road materials, regenerated building materials, regenerated aggregates and the like) accounts for 10 percent for the treatment of the four types of waste at present. Domestic treatment modes of construction wastes are mainly divided into two types: firstly, lightly sorting the construction waste and then stacking or burying the construction waste in the open air; and secondly, the materials are directly stacked or buried in the open air without any treatment. If the piles are 5m high on average, 8 hundred million tons of construction waste will occupy 20 ten thousand mu per year.
It has been reported that construction waste is processed and processed to prepare recycled fine aggregate, which is used for preparing recycled aggregate machine-sprayed mortar. However, because the recycled aggregate of construction waste has the defects of large water absorption, multiple water chestnuts, sharp shape, small apparent density, large crushing value, poor durability and the like, the machine-blasted mortar prepared by the recycled aggregate has low strength, large water absorption and easy falling, and the performance of the recycled aggregate is improved by generally adopting an aggregate strengthening technology. The conventional aggregate strengthening technology is to fix a strengthening material on the surface of the recycled aggregate or at the gap of the recycled aggregate in a slurry soaking mode, and the penetration capability of the strengthening material is limited and the strengthening material cannot penetrate into the recycled aggregate. And the method has large floor area and low field turnover rate, cannot realize timely production and is not beneficial to the requirement of actual production.
Therefore, a new recycled aggregate strengthening process is still needed, which simplifies the strengthening process, improves the strengthening efficiency and improves the performance of spraying and plastering mortar by a recycled aggregate machine.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a pre-wetting strengthening process for recycled fine aggregate, which enhances the binding force between gaps and simultaneously reduces the water absorption of the recycled aggregate through the optimized design and method innovation of the process so as to strengthen the performance of the recycled aggregate.
The invention also aims to provide the reinforced recycled fine aggregate prepared by the process, which can replace 100% of natural sand in the traditional ready-mixed mortar, greatly improve the utilization rate of the recycled fine aggregate and greatly consume a large amount of construction waste.
The invention also aims to provide the mechanical spraying plastering mortar prepared from the reinforced recycled fine aggregate, which has the characteristics of high strength, cracking resistance, light weight, environmental protection, low water absorption and the like.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a pre-wetting strengthening process of recycled fine aggregate comprises the following steps:
1) pretreating the construction waste to obtain II-type recycled fine aggregate;
2) mixing the II-class recycled fine aggregate and the natural aggregate according to a certain proportion, and feeding the mixture into a pre-wetting homogenizer;
3) diluting an organic silicon waterproofing agent, and adding a certain proportion of surfactant to prepare liquid A; diluting the nano-scale acrylic emulsion, and adding a certain proportion of surfactant to prepare a liquid B; both the liquids a and B were mixed by mass 1: 1, adding the mixture into a pre-wetting homogenizer in an atomization spraying mode, and uniformly stirring and mixing the mixture with the recycled fine aggregate, wherein the water content of the recycled fine aggregate is controlled to be 5-8%;
4) and drying and warehousing the pre-wetted and homogenized recycled fine aggregate, and controlling the water content to be less than 0.5% to obtain the reinforced recycled fine aggregate. In a specific embodiment, the construction waste of step 1) is selected from any one of waste concrete, mortar, stones, tiles.
In a specific embodiment, the natural aggregate in the step 2) is river sand, machine-made sand; the mixing mass ratio of the II-class recycled fine aggregate to the natural aggregate is (1-15): 10.
in a specific embodiment, the silicone waterproofing agent in the liquid a prepared in step 3) is coatable, the silicone waterproofing agent is diluted to 100-200 times, and a surfactant is added according to a mass ratio of 0.5/% o, and the surfactant is selected from a fluorine surfactant or a silicon surfactant.
In a specific embodiment, the nanoscale acrylic emulsion is diluted to 50-100 times in the preparation liquid B in the step 3), and a surfactant is added according to a mass ratio of 1/% o, wherein the surfactant is selected from a fluorine surfactant or a silicon surfactant. In a preferred embodiment, the surfactants used to formulate liquid a and liquid B are the same.
In another aspect of the present invention, the reinforced recycled fine aggregate is prepared by any one of the above-mentioned pre-wet reinforcement processes for recycled fine aggregate; preferably, the monopole maximum crushing index value of the reinforced recycled fine aggregate is less than 20%, the water demand ratio is less than 1.30, the strength ratio of the recycled mortar is more than 0.3, and the porosity is less than 46%.
In another aspect of the invention, the mechanically sprayed plastering mortar material is prepared by adopting the reinforced recycled fine aggregate.
In a preferred embodiment, the mechanical spray plastering mortar material comprises the following components in percentage by mass:
compared with the prior art, the invention has the following beneficial effects:
1) according to the pre-wetting strengthening process for the recycled aggregate, the surface tension of an organic silicon waterproof agent and a nano acrylic emulsion is reduced and the permeability of the organic silicon waterproof agent and the nano acrylic emulsion is improved under the action of a surfactant, particularly, the nano acrylic emulsion is selected and diluted to 50-100 times, and the organic silicon waterproof agent (which can be coated) is simultaneously selected and diluted to 100-200 times, so that the permeability of the organic silicon waterproof agent and the nano acrylic emulsion is greatly improved, the organic silicon waterproof agent and the nano acrylic emulsion are prompted to instantly permeate into the recycled aggregate, gaps on the surface of the recycled aggregate are blocked, the binding force between the gaps is enhanced, and the water absorption of the recycled aggregate is reduced.
2) According to the pre-wetting reinforcement process for the recycled aggregate, the reinforcement material is promoted to uniformly wrap the recycled aggregate and increase the permeation speed through atomization spraying and high-speed stirring dispersion of the pre-wetting homogenizer, so that the effect of instantly permeating into the recycled aggregate is achieved.
3) According to the process for pre-wetting and strengthening the recycled aggregate, the pre-wetted and homogenized recycled aggregate is directly dried and put in storage, namely the recycled aggregate can be put in storage after being dried to reach the specified moisture content without being soaked and placed for a period of time, so that the production efficiency is greatly improved, and the production field is saved.
4) The reinforced recycled fine aggregate produced by the method can be used for producing mechanical spraying plastering mortar by 100 percent, greatly improves the utilization rate of the recycled aggregate, and is beneficial to large consumption and comprehensive utilization of construction waste.
Drawings
FIG. 1 is a schematic view of a process flow of the pre-wetting and strengthening process of recycled aggregate according to the present invention.
Detailed Description
The present invention will be further described with reference to more specific embodiments, but it should be noted that the recycled aggregate pre-wet strengthening process of the present invention is not limited to this specific component or step. It will be apparent to those skilled in the art that the following description may be applied directly to other similar components or process steps not specified herein, without any adjustment or modification.
As shown in fig. 1, the process flow of the recycled aggregate pre-wetting reinforcement of the invention comprises the following steps:
1) and (3) pretreating the construction waste to obtain II-class recycled fine aggregate.
The construction waste comprises but is not limited to waste concrete, mortar, stones and tiles, and can be any one or a mixture of the waste concrete, the mortar, the stones and the tiles, the pretreatment comprises but is not limited to crushing, shaping and sand making of the construction waste, and for example, the pretreatment also comprises a sorting step, and impurities (such as steel bars, wood, gypsum, glass, paper and the like) in the construction waste are removed. The processes of crushing, shaping, sand making and the like are all common means in the field and can refer to the prior art, the pretreatment of the invention only requires that the construction waste is pretreated into II-type recycled fine aggregate which meets the regulation of GB/T25176-2010 recycled fine aggregate for concrete and mortar, the specific treatment method is not limited at all, and any common method in the field, such as jaw crusher crushing or impact crushing and the like, can be completely adopted. For example, the particle size of the II-class recycled fine aggregate obtained by pretreatment is less than 4.75mm, the single-stage maximum crushing index value is less than 30%, the water demand ratio is less than 1.70, the strength ratio of the recycled mortar is more than 0.75, and other indexes refer to the national standard GB/T25176-2010 recycled fine aggregate for concrete and mortar.
2) Mixing recycled fine aggregate and natural aggregate (river sand and machine-made sand) according to the proportion of (1-15): the mass ratio of 10 is measured accurately by a 1# belt weigher and a 2# belt weigher and then is conveyed into a pre-wetting homogenizer by a belt.
The pre-wetting homogenizer is a mixing device with stirring function, including but not limited to horizontal stirring, and may also include up-down stirring, so as to rapidly stir and fully mix. In addition, the pre-wetting homogenizer is also provided with a liquid atomization spraying port, and the additive is added into the pre-wetting homogenizer in a liquid atomization spraying mode, so that the additive and the recycled fine aggregate are fully and uniformly mixed.
3) Diluting an organosilicon waterproofing agent (which can be coated) to 100-200 times, and adding a fluorine surfactant (or a silicon surfactant) according to the mass ratio of 0.5 per thousand to prepare liquid A; diluting the nanoscale acrylic emulsion into 50-100 times, adding a fluorine surfactant (or a silicon surfactant) according to the mass ratio of 1/% o to prepare a liquid B, and mixing the two diluted liquids according to the mass ratio of the liquid A: liquid B ═ 1: 1, and uniformly stirring the mixture and the regenerated fine aggregate in the pre-wetting homogenizer in an atomizing and spraying mode to ensure that the water content of the regenerated fine aggregate is 5-8%.
Wherein, the organic silicon emulsion type building water repellent can be coated. Has the characteristics of excellent waterproof performance, good air permeability and the like, such as Van Kort water repellent (can be coated). The dilution can be directly diluted by water, for example, 99kg of tap water is added into 1kg of the universal coatable liquid to obtain the universal coatable liquid diluted by 100 times; and then adding a surfactant according to the mass ratio of 0.5 per thousand based on the total mass of the diluted coatable liquid. Similarly, the preparation method of the liquid B is to add the surfactant according to the mass of the diluted nano-scale acrylic emulsion by 1/% per thousand after dilution. The surfactants used in liquid A and liquid B are preferably the same, but may of course be different.
Fluorosurfactants include nonionic, anionic, cationic, and zwitterionic fluorocarbon surfactants. Preferably an anionic fluorosurfactant; the silicon surfactants include anionic, cationic and nonionic silicon surfactants, preferably anionic silicon surfactants. And promoting the water content of the recycled fine aggregate to be 5-8% through the permeation action of the surfactant. The water content is too high, the later drying efficiency is low, and the energy consumption is large; the water content is too low, the water absorption of the recycled fine aggregate is insufficient, and the organic silicon water repellent and the nano acrylic emulsion cannot fully permeate into the recycled fine aggregate, so that the strengthening effect is reduced.
The pre-wetting homogenization strengthening process of the recycled fine aggregate reduces the surface tension of the organosilicon waterproofing agent (universal coatability) and the nano-scale acrylic emulsion through the action of the surfactant, improves the permeability of the organosilicon waterproofing agent and the nano-scale acrylic emulsion, promotes the organosilicon waterproofing agent (universal coatability) and the nano-scale acrylic emulsion to instantly permeate into the recycled aggregate, blocks the surface gaps of the recycled aggregate, enhances the binding power between the gaps, and simultaneously reduces the water absorption of the recycled aggregate, thereby strengthening the performance of the recycled aggregate.
Meanwhile, the reinforcing material is further promoted to uniformly wrap the recycled aggregate and increase the penetration speed through the atomization spraying and high-speed stirring dispersion of the pre-wetting homogenizer, so that the effect of instantly penetrating into the recycled aggregate is achieved.
4) Drying the pre-wetted and homogenized recycled fine aggregate by a dryer, and warehousing to obtain the reinforced recycled fine aggregate, and ensuring that the moisture content of the reinforced recycled fine aggregate is within 0.5%.
Through the step, the pre-wetted and homogenized recycled aggregate is directly dried and put in storage, namely dried to a specified moisture content and put in storage, for example, the moisture content is controlled within 0.5 percent and put in storage for standby without soaking and standing for a period of time. The process of the invention has the advantages of continuous production, greatly improved production efficiency and saved production field, and the steps of crushing, screening, belt weighing and conveying, prewetting and homogenizing, drying and the like can be realized.
The reinforced recycled fine aggregate is prepared by the pre-wetting homogenized recycled fine aggregate reinforcing process, the monopole maximum crushing index value of the reinforced recycled fine aggregate is less than 20%, the water demand ratio is less than 1.30, the strength ratio of the reclaimed mortar is more than 0.3, and the porosity is less than 46%.
Furthermore, the reinforced recycled fine aggregate can be used for producing mechanical spraying plastering mortar by 100% due to specific performance, and is not required to be matched and mixed with other common concrete for use, so that the utilization rate of the recycled aggregate is greatly improved, the comprehensive utilization of resources of construction waste is realized to a great extent, the construction waste is greatly consumed, and excessive landfill and stacking are avoided.
The method for using the reinforced recycled fine aggregate for mechanically spraying plastering mortar comprises the following steps: the reinforced recycled aggregate, the cement, the optional admixture, the cellulose ether and the air entraining agent are metered according to the proportion and then are added into a stirrer to be uniformly stirred, and are conveyed to a construction site in a bulk or bag mode to be directly used. The mixture ratio is as follows (based on the mass of the mechanical spraying plastering mortar, the mass percent is as follows):
cement: 14.5 to 24.5 percent
Reinforcing recycled aggregate: 75 to 85 percent
Blending materials: 0 to 5 percent
Cellulose ether: 0.01 to 0.02 percent
Air entraining agent: 0.005-0.01%
A slip agent: 0.05 to 0.1 percent
Water reducing agent: 0.01 to 0.02 percent
All the other products are commercial products except the reinforced recycled aggregate self-made by the method of the invention, and can be directly purchased.
For example, the admixture is an active or inert material which is mixed into the concrete for improving the performance of the concrete, reducing the consumption of cement and reducing the hydration heat, the common admixture is materials such as fly ash, industrial waste slag (ground slag, phosphorus slag) and the like, the admixture in the concrete not only has the functions of dispersing and filling and improving the construction performance of the concrete, but also participates in the hydration of the cement, and the admixture has great contribution to the strength development, compactness and impermeability of the concrete. In the invention, the admixture can be not added, or can be added in a small amount, for example, the adding amount is not more than 5% of the total mass of the mortar, or 4%, 3%, 2% or less.
The cellulose ether is methyl cellulose ether or hydroxypropyl methyl cellulose ether. The cellulose ether can endow the wet mortar with excellent viscosity, can obviously increase the bonding capability of the wet mortar and a base layer, and improves the anti-sagging performance of the mortar; the thickening effect can also increase the dispersion resistance and the homogeneity of the fresh-mixed material, and prevent the material from layering, segregation and bleeding.
The air entraining agent can obviously improve the workability of concrete, reduce the segregation and bleeding of the concrete, improve the pumpability and improve the frost resistance and the durability of the concrete, and particularly can refer to the air entraining agent standard in GB/8076-.
The slip agent mainly has the effects of fully thickening cement and recycled aggregate, greatly improving the wrapping property of mortar, further improving the water retention property of the mortar and simultaneously reducing the using amount of cellulose ether, thereby reducing the viscosity of the mortar and enabling the mortar to be thick and not sticky. Such as slip agent from Zhejiang co-creation building materials science and technology, Inc.
The water reducing agent is lignosulfonate, naphthalene sulfonate formaldehyde polymer and the like. After the concrete mixture is added, the dispersion effect on cement particles is achieved, the workability of the concrete mixture can be improved, the unit water consumption is reduced, and the fluidity of the concrete mixture is improved; or the unit cement consumption is reduced, and the cement is saved.
The addition sequence of the components is not limited at all, for example, cement is added into the reinforced recycled aggregate firstly, the mixture is stirred for a while, other additives with small amount are added and stirred simultaneously, and the components are uniformly mixed according to the proportion to obtain the mechanical spraying plastering mortar of the invention.
The mechanical spraying plastering mortar prepared from the reinforced recycled fine aggregate prepared by the method has the characteristics of high strength, cracking resistance, light weight, environmental protection, low water absorption and the like, meets the quality requirement of the building industry, and can be widely applied to building construction. Performance indexes of the reinforced recycled fine aggregate are as follows: the maximum crushing index value of the single pole is less than 20 percent, the water requirement ratio is less than 1.30, the strength ratio of the regenerated mortar is more than 0.9, and the porosity is less than 46 percent.
Although particular embodiments of the invention have been described and illustrated in detail, it should be understood that various equivalent changes and modifications could be made to the above-described embodiments in accordance with the spirit of the invention, and the resulting functional effects would still fall within the scope of the invention, without departing from the spirit of the description and the accompanying drawings.
Claims (10)
1. The pre-wetting strengthening process of the recycled fine aggregate is characterized by comprising the following steps of:
1) pretreating the construction waste to obtain II-type recycled fine aggregate;
2) mixing the II-class recycled fine aggregate and the natural aggregate according to a certain proportion, and feeding the mixture into a pre-wetting homogenizer;
3) diluting an organic silicon waterproofing agent, and adding a certain proportion of surfactant to prepare liquid A; diluting the nano-scale acrylic emulsion, and adding a certain proportion of surfactant to prepare a liquid B; both the liquids a and B were mixed by mass 1: 1, adding the mixture into a pre-wetting homogenizer in an atomization spraying mode, and uniformly stirring and mixing the mixture with the recycled fine aggregate, wherein the water content of the recycled fine aggregate is controlled to be 5-8%;
4) and drying and warehousing the pre-wetted and homogenized recycled fine aggregate, and controlling the water content to be less than 0.5% to obtain the reinforced recycled fine aggregate.
2. The process for pre-wet strengthening of recycled fine aggregate according to claim 1, wherein the construction waste of step 1) is selected from any one of waste concrete, mortar, stone, and tile.
3. The process for pre-wetting and strengthening recycled fine aggregate according to claim 1 or 2, wherein the natural aggregate in the step 2) is river sand or machine-made sand; the mixing mass ratio of the II-class recycled fine aggregate to the natural aggregate is (1-15): 10.
4. the pre-wetting strengthening process of recycled fine aggregate according to claim 1, wherein the silicone waterproofing agent in the liquid A prepared in the step 3) is universal, the silicone waterproofing agent is diluted to 100-200 times, and a surfactant is added according to a mass ratio of 0.5/% o, and the surfactant is selected from a fluorine surfactant or a silicon surfactant.
5. The pre-wetting reinforcement process for recycled fine aggregate according to claim 1 or 4, wherein the nano acrylic emulsion is diluted to 50-100 times in the liquid B prepared in the step 3), and a surfactant is added according to a mass ratio of 1/% o, wherein the surfactant is selected from a fluorine surfactant or a silicon surfactant.
6. The process of claim 5, wherein the surfactant used in the preparation of liquid A and liquid B is the same.
7. A reinforced recycled fine aggregate obtained by the process of pre-wet reinforcement of recycled fine aggregate according to any one of claims 1 to 6.
8. The reinforced recycled fine aggregate of claim 8, wherein the monopolar maximum crush index value of the reinforced recycled fine aggregate is less than 20%, the water demand ratio is less than 1.30, the reclaimed mortar strength ratio is greater than 0.9, and the porosity is less than 46%.
9. A mechanically sprayed plastering mortar, wherein the reinforced recycled fine aggregate prepared by the pre-wetting reinforcement process of the recycled fine aggregate of any one of claims 1 to 6 or the reinforced recycled fine aggregate of any one of claims 7 to 8 is adopted.
10. The mechanical spraying plastering mortar of claim 9, which comprises the following components in percentage by mass:
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Cited By (5)
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| CN113683330A (en) * | 2021-08-04 | 2021-11-23 | 深圳大学 | Preparation method and preparation system of reinforced recycled aggregate |
| CN113683330B (en) * | 2021-08-04 | 2022-06-10 | 深圳大学 | Preparation method and preparation system of reinforced recycled aggregate |
| CN113698121A (en) * | 2021-08-31 | 2021-11-26 | 东南大学 | Composite strengthening method for building waste regenerated aggregate particles |
| CN113698121B (en) * | 2021-08-31 | 2022-09-02 | 东南大学 | Composite strengthening method for building waste regenerated aggregate particles |
| CN115028417A (en) * | 2022-07-15 | 2022-09-09 | 重庆中铠嘉业环保砂浆有限公司 | Premixed plastering waterproof mortar based on high-performance composite material and preparation process thereof |
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