CN116081971A - Method for preparing fine recycled aggregate from waste concrete - Google Patents
Method for preparing fine recycled aggregate from waste concrete Download PDFInfo
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- CN116081971A CN116081971A CN202111296681.7A CN202111296681A CN116081971A CN 116081971 A CN116081971 A CN 116081971A CN 202111296681 A CN202111296681 A CN 202111296681A CN 116081971 A CN116081971 A CN 116081971A
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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
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
- C04B20/1085—Waterglass
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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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- 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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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a method for preparing fine recycled aggregate from waste concrete, which belongs to the technical field of recycled aggregate and comprises the following steps: crushing the waste concrete into particles with the diameter smaller than 20mm by using a jaw crusher, and then removing waste iron contained in the original waste concrete by using a magnetic separator through the crushed waste particles; calcining the waste concrete particles at 700-800 ℃, cooling the calcined and cooled waste concrete particles, transferring the waste concrete particles into a reaction kettle, and introducing water vapor under the stirring condition to heat and humidify; grinding the particles treated in the step S2 by a ball mill, and sieving by a vibrating screen to remove particles with the particle size of more than 75 mu m; placing the screened particles into a reaction kettle, adding diatomite, introducing carbon dioxide gas, and stirring and mixing at a high speed; and adding the mixture into the aggregate strengthening liquid, soaking for 25-40h, and then drying and grinding to obtain the fine recycled aggregate. The porosity of the recycled aggregate is reduced, the water absorption of the aggregate is effectively reduced, and the performance of the recycled aggregate is effectively improved.
Description
Technical Field
The invention relates to the technical field of recycled aggregate, in particular to a method for preparing fine recycled aggregate from waste concrete.
Background
With the steady promotion of urban and rural construction in China, a large amount of construction waste is generated, bad influence is caused to environmental protection industry in China, meanwhile, a large amount of natural sand and stone is consumed in the urban construction process, natural sand and stone aggregate resources in China are increasingly deficient, waste concrete blocks are used as solid waste for burying or directly discarding, the waste concrete is used for manufacturing the construction aggregate, the technical problem is one of the problems, the waste concrete is crushed and screened, recycled aggregate which can partially or completely replace the natural sand and stone aggregate is produced, and compared with the natural sand and stone aggregate, the void ratio and the water absorption rate of the recycled aggregate are larger than those of the natural sand and stone aggregate, so that the effect and the service life of the recycled aggregate after practical application are influenced.
Disclosure of Invention
The invention aims to provide a method for preparing fine recycled aggregate from waste concrete, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the method for preparing the fine recycled aggregate from the waste concrete comprises the following steps:
s1, crushing waste concrete into particles with the diameter smaller than 20mm by using a jaw crusher, and then removing waste iron contained in the original waste concrete by using a magnetic separator through the crushed waste particles;
s2, calcining the waste concrete particles at 700-800 ℃, cooling the calcined and cooled waste concrete particles, transferring the calcined and cooled waste concrete particles into a reaction kettle, and introducing water vapor under the stirring condition to heat and humidify the waste concrete particles;
s3, grinding the particles treated in the step S2 by a ball mill, and sieving by a vibrating screen to remove particles with the particle size of more than 75 mu m;
s4, placing the screened particles into a reaction kettle, adding diatomite, introducing carbon dioxide gas, and stirring and mixing at a high speed;
and S5, adding the mixture into the aggregate strengthening liquid, soaking for 25-40h, and then drying and grinding to obtain the fine recycled aggregate.
In a preferred embodiment, in the step S2, the calcination time is 1-2h, the water vapor is introduced until the temperature reaches 180-200 ℃, the pressure in the reaction kettle is kept at 1.3-1.5MPa, and the stirring speed is 800-1000r/min.
In a preferred implementation case, in the step S4, the mass of the diatomite is 3% -8% of that of the concrete particles, the pressure in the reaction kettle is 1.2-1.3MPa, and the carbon dioxide introducing time and the stirring time are 0.5-1h.
In a preferred embodiment, the aggregate strengthening liquid comprises the following raw materials in parts by weight: 30-40 parts of silica fume, 25-35 parts of alumina powder, 60-80 parts of alkali liquor, 15-30 parts of sodium carbonate, 20-40 parts of inorganic filler, 10-20 parts of silicone resin, 5-10 parts of penetrant, 2-8 parts of dispersing agent, 3-8 parts of water reducer and 80-100 parts of water.
In a preferred embodiment, the aggregate strengthening liquid comprises the following raw materials in parts by weight: 32 parts of silica fume, 26 parts of alumina powder, 64 parts of alkali liquor, 17 parts of sodium carbonate, 24 parts of inorganic filler, 12 parts of silicone resin, 6 parts of penetrating agent, 3 parts of dispersing agent, 4 parts of water reducer and 85 parts of water.
In a preferred embodiment, the aggregate strengthening liquid comprises the following raw materials in parts by weight: 35 parts of silica fume, 28 parts of alumina powder, 70 parts of alkali liquor, 20 parts of sodium carbonate, 28 parts of inorganic filler, 14 parts of silicone resin, 7 parts of penetrating agent, 5 parts of dispersing agent, 5 parts of water reducer and 90 parts of water.
In a preferred embodiment, the aggregate strengthening liquid comprises the following raw materials in parts by weight: 37 parts of silica fume, 30 parts of alumina powder, 74 parts of alkali liquor, 24 parts of sodium carbonate, 34 parts of inorganic filler, 16 parts of silicone resin, 8 parts of penetrant, 6 parts of dispersing agent, 6 parts of water reducer and 95 parts of water.
In a preferred embodiment, the aggregate strengthening liquid comprises the following raw materials in parts by weight: 39 parts of silica fume, 32 parts of alumina powder, 78 parts of alkali liquor, 28 parts of sodium carbonate, 38 parts of inorganic filler, 18 parts of silicone resin, 9 parts of penetrant, 7 parts of dispersing agent, 7 parts of water reducer and 100 parts of water.
In a preferred embodiment, the alkali solution is a mixed solution of potassium hydroxide and water glass, and the modulus of the water glass is adjusted to be 1.0-1.2 by the potassium hydroxide; the inorganic filler is calcium sulfoaluminate, aluminum oxide clinker, calcium chloride, magnesium sulfate and potassium dihydrogen phosphate according to the mass ratio of (1-4): (3-5): (2-6): (3-7): the mixture of (2-3), wherein the penetrating agent is one or more of isobutyl triethoxysilane, sodium alkylbenzenesulfonate, sodium alkyl sulfate, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether; the dispersing agent is one or more of magnesium stearate, zinc stearate and HPMA; the water reducer is a polycarboxylic acid high-efficiency water reducer.
In a preferred embodiment, in step S5, the soaking temperature is 25-30deg.C, the drying temperature is 50-60deg.C, and the drying time is 10-12 hr.
The invention has the beneficial effects that: crushing, calcining and steam heating waste concrete, ball milling to crush the waste concrete fully, adding diatomite, soaking with strengthening liquid, and alkali-silicic acid reacting alkali liquid in the strengthening liquid with waste concrete particles to fill alkali-silicic acid gel into the pores of the adhesive mortar, so as to reduce the porosity of the recycled aggregate and ensure that the apparent density of the recycled aggregate is 1.98g/cm from that of common recycled aggregate 3 Is increased to 2.3-2.4g/cm 3 And through alkali liquor, silicone resin and various auxiliary agents, the water absorption of the aggregate is effectively reduced, so that the water absorption of the common recycled aggregate is reduced from 6.9% -7.5% to 4.5% -5.2%, the performance of the recycled aggregate is effectively improved, the recycled aggregate is similar to the nature of natural aggregate, the use requirement is met, the use performance of the recycled aggregate prepared from waste concrete is improved, and the resources and the economic cost are saved.
Drawings
Fig. 1 is a schematic diagram of a method for preparing fine recycled aggregate from waste concrete according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: as shown in fig. 1, the invention provides a method for preparing fine recycled aggregate from waste concrete, which comprises the following steps:
s1, crushing waste concrete into particles with the diameter smaller than 20mm by using a jaw crusher, and then removing waste iron contained in the original waste concrete by using a magnetic separator through the crushed waste particles;
s2, calcining the waste concrete particles at 700-800 ℃, cooling the calcined and cooled waste concrete particles, transferring the calcined and cooled waste concrete particles into a reaction kettle, and introducing water vapor under the stirring condition to heat and humidify the waste concrete particles;
s3, grinding the particles treated in the step S2 by a ball mill, and sieving by a vibrating screen to remove particles with the particle size of more than 75 mu m;
s4, placing the screened particles into a reaction kettle, adding diatomite, introducing carbon dioxide gas, and stirring and mixing at a high speed;
and S5, adding the mixture into the aggregate strengthening liquid, soaking for 25-40h, and then drying and grinding to obtain the fine recycled aggregate.
Further, in the step S2, the calcination time is 1-2h, the water vapor is introduced until the temperature reaches 180-200 ℃, the pressure in the reaction kettle is kept at 1.3-1.5MPa, and the stirring speed is 800-1000r/min.
In step S4, the mass of the diatomite is 3% -8% of that of the concrete particles, the pressure in the reaction kettle is 1.2-1.3MPa, and the carbon dioxide introducing time and the stirring time are 0.5-1h.
Further, the aggregate strengthening liquid comprises the following raw materials in parts by weight: 32 parts of silica fume, 26 parts of alumina powder, 64 parts of alkali liquor, 17 parts of sodium carbonate, 24 parts of inorganic filler, 12 parts of silicone resin, 6 parts of penetrating agent, 3 parts of dispersing agent, 4 parts of water reducer and 85 parts of water.
Further, the alkali liquor is a mixed solution of potassium hydroxide and water glass, and the modulus of the water glass is adjusted to 1.0-1.2 by potassium hydroxide; the inorganic filler is calcium sulfoaluminate, aluminum oxide clinker, calcium chloride, magnesium sulfate and potassium dihydrogen phosphate according to the mass ratio of 1:3:3:3:2, wherein the penetrating agent is isobutyl triethoxysilane; the dispersing agent is a mixture of magnesium stearate and zinc stearate according to a mass ratio of 1:1; the water reducer is a polycarboxylic acid high-efficiency water reducer.
Further, in the step S5, the soaking temperature is 25-30 ℃, the drying temperature is 50-60 ℃ and the drying time is 10-12 hours.
Example 2: as shown in fig. 1, the invention provides a method for preparing fine recycled aggregate from waste concrete, which comprises the following steps:
s1, crushing waste concrete into particles with the diameter smaller than 20mm by using a jaw crusher, and then removing waste iron contained in the original waste concrete by using a magnetic separator through the crushed waste particles;
s2, calcining the waste concrete particles at 700-800 ℃, cooling the calcined and cooled waste concrete particles, transferring the calcined and cooled waste concrete particles into a reaction kettle, and introducing water vapor under the stirring condition to heat and humidify the waste concrete particles;
s3, grinding the particles treated in the step S2 by a ball mill, and sieving by a vibrating screen to remove particles with the particle size of more than 75 mu m;
s4, placing the screened particles into a reaction kettle, adding diatomite, introducing carbon dioxide gas, and stirring and mixing at a high speed;
and S5, adding the mixture into the aggregate strengthening liquid, soaking for 25-40h, and then drying and grinding to obtain the fine recycled aggregate.
Further, in the step S2, the calcination time is 1-2h, the water vapor is introduced until the temperature reaches 180-200 ℃, the pressure in the reaction kettle is kept at 1.3-1.5MPa, and the stirring speed is 800-1000r/min.
In step S4, the mass of the diatomite is 3% -8% of that of the concrete particles, the pressure in the reaction kettle is 1.2-1.3MPa, and the carbon dioxide introducing time and the stirring time are 0.5-1h.
Further, the aggregate strengthening liquid comprises the following raw materials in parts by weight: 35 parts of silica fume, 28 parts of alumina powder, 70 parts of alkali liquor, 20 parts of sodium carbonate, 28 parts of inorganic filler, 14 parts of silicone resin, 7 parts of penetrating agent, 5 parts of dispersing agent, 5 parts of water reducer and 90 parts of water.
Further, the alkali liquor is a mixed solution of potassium hydroxide and water glass, and the modulus of the water glass is adjusted to 1.0-1.2 by potassium hydroxide; the inorganic filler is calcium sulfoaluminate, aluminum oxide clinker, calcium chloride, magnesium sulfate and potassium dihydrogen phosphate according to the mass ratio of 2:3:4:3:3, wherein the penetrating agent is isobutyl triethoxysilane; the dispersing agent is a mixture of magnesium stearate and zinc stearate according to a mass ratio of 1:2; the water reducer is a polycarboxylic acid high-efficiency water reducer.
Further, in the step S5, the soaking temperature is 25-30 ℃, the drying temperature is 50-60 ℃ and the drying time is 10-12 hours.
Example 3: as shown in fig. 1, the invention provides a method for preparing fine recycled aggregate from waste concrete, which comprises the following steps:
s1, crushing waste concrete into particles with the diameter smaller than 20mm by using a jaw crusher, and then removing waste iron contained in the original waste concrete by using a magnetic separator through the crushed waste particles;
s2, calcining the waste concrete particles at 700-800 ℃, cooling the calcined and cooled waste concrete particles, transferring the calcined and cooled waste concrete particles into a reaction kettle, and introducing water vapor under the stirring condition to heat and humidify the waste concrete particles;
s3, grinding the particles treated in the step S2 by a ball mill, and sieving by a vibrating screen to remove particles with the particle size of more than 75 mu m;
s4, placing the screened particles into a reaction kettle, adding diatomite, introducing carbon dioxide gas, and stirring and mixing at a high speed;
and S5, adding the mixture into the aggregate strengthening liquid, soaking for 25-40h, and then drying and grinding to obtain the fine recycled aggregate.
Further, in the step S2, the calcination time is 1-2h, the water vapor is introduced until the temperature reaches 180-200 ℃, the pressure in the reaction kettle is kept at 1.3-1.5MPa, and the stirring speed is 800-1000r/min.
In step S4, the mass of the diatomite is 3% -8% of that of the concrete particles, the pressure in the reaction kettle is 1.2-1.3MPa, and the carbon dioxide introducing time and the stirring time are 0.5-1h.
Further, the aggregate strengthening liquid comprises the following raw materials in parts by weight: 37 parts of silica fume, 30 parts of alumina powder, 74 parts of alkali liquor, 24 parts of sodium carbonate, 34 parts of inorganic filler, 16 parts of silicone resin, 8 parts of penetrant, 6 parts of dispersing agent, 6 parts of water reducer and 95 parts of water.
Further, the alkali liquor is a mixed solution of potassium hydroxide and water glass, and the modulus of the water glass is adjusted to 1.0-1.2 by potassium hydroxide; the inorganic filler is calcium sulfoaluminate, aluminum oxide clinker, calcium chloride, magnesium sulfate and potassium dihydrogen phosphate according to the mass ratio of 3:4:2:5:2, wherein the penetrating agent is a mixture of isobutyl triethoxysilane and sodium alkylbenzenesulfonate according to a mass ratio of 2:3; the dispersing agent is HPMA; the water reducer is a polycarboxylic acid high-efficiency water reducer.
Further, in the step S5, the soaking temperature is 25-30 ℃, the drying temperature is 50-60 ℃ and the drying time is 10-12 hours.
Example 4: as shown in fig. 1, the invention provides a method for preparing fine recycled aggregate from waste concrete, which comprises the following steps:
s1, crushing waste concrete into particles with the diameter smaller than 20mm by using a jaw crusher, and then removing waste iron contained in the original waste concrete by using a magnetic separator through the crushed waste particles;
s2, calcining the waste concrete particles at 700-800 ℃, cooling the calcined and cooled waste concrete particles, transferring the calcined and cooled waste concrete particles into a reaction kettle, and introducing water vapor under the stirring condition to heat and humidify the waste concrete particles;
s3, grinding the particles treated in the step S2 by a ball mill, and sieving by a vibrating screen to remove particles with the particle size of more than 75 mu m;
s4, placing the screened particles into a reaction kettle, adding diatomite, introducing carbon dioxide gas, and stirring and mixing at a high speed;
and S5, adding the mixture into the aggregate strengthening liquid, soaking for 25-40h, and then drying and grinding to obtain the fine recycled aggregate.
Further, in the step S2, the calcination time is 1-2h, the water vapor is introduced until the temperature reaches 180-200 ℃, the pressure in the reaction kettle is kept at 1.3-1.5MPa, and the stirring speed is 800-1000r/min.
In step S4, the mass of the diatomite is 3% -8% of that of the concrete particles, the pressure in the reaction kettle is 1.2-1.3MPa, and the carbon dioxide introducing time and the stirring time are 0.5-1h.
Further, the aggregate strengthening liquid comprises the following raw materials in parts by weight: 39 parts of silica fume, 32 parts of alumina powder, 78 parts of alkali liquor, 28 parts of sodium carbonate, 38 parts of inorganic filler, 18 parts of silicone resin, 9 parts of penetrant, 7 parts of dispersing agent, 7 parts of water reducer and 100 parts of water.
Further, the alkali liquor is a mixed solution of potassium hydroxide and water glass, and the modulus of the water glass is adjusted to 1.0-1.2 by potassium hydroxide; the inorganic filler is calcium sulfoaluminate, aluminum oxide clinker, calcium chloride, magnesium sulfate and potassium dihydrogen phosphate according to the mass ratio of 4:5:3:5:3, wherein the penetrating agent is sodium alkyl sulfate; the dispersing agent is HPMA; the water reducer is a polycarboxylic acid high-efficiency water reducer.
Further, in the step S5, the soaking temperature is 25-30 ℃, the drying temperature is 50-60 ℃ and the drying time is 10-12 hours.
Crushing, calcining and steam heating waste concrete, ball milling to crush the waste concrete fully, adding diatomite, soaking with strengthening liquid, and alkali-silicic acid reacting alkali liquid in the strengthening liquid with waste concrete particles to fill alkali-silicic acid gel into the pores of the adhesive mortar, so as to reduce the porosity of the recycled aggregate and ensure that the apparent density of the recycled aggregate is 1.98g/cm from that of common recycled aggregate 3 Is increased to 2.3-2.4g/cm 3 And through alkali liquor, silicone resin and various auxiliary agents, the water absorption of the aggregate is effectively reduced, so that the water absorption of the common recycled aggregate is reduced from 6.9% -7.5% to 4.5% -5.2%, the performance of the recycled aggregate is effectively improved, the recycled aggregate is similar to the nature of natural aggregate, the use requirement is met, the use performance of the recycled aggregate prepared from waste concrete is improved, and the resources and the economic cost are saved.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The method for preparing the fine recycled aggregate by using the waste concrete is characterized by comprising the following steps of:
s1, crushing waste concrete into particles with the diameter smaller than 20mm by using a jaw crusher, and then removing waste iron contained in the original waste concrete by using a magnetic separator through the crushed waste particles;
s2, calcining the waste concrete particles at 700-800 ℃, cooling the calcined and cooled waste concrete particles, transferring the calcined and cooled waste concrete particles into a reaction kettle, and introducing water vapor under the stirring condition to heat and humidify the waste concrete particles;
s3, grinding the particles treated in the step S2 by a ball mill, and sieving by a vibrating screen to remove particles with the particle size of more than 75 mu m;
s4, placing the screened particles into a reaction kettle, adding diatomite, introducing carbon dioxide gas, and stirring and mixing at a high speed;
and S5, adding the mixture into the aggregate strengthening liquid, soaking for 25-40h, and then drying and grinding to obtain the fine recycled aggregate.
2. The method for preparing fine recycled aggregate from waste concrete according to claim 1, wherein the method comprises the following steps: in the step S2, the calcination time is 1-2h, the water vapor is introduced until the temperature reaches 180-200 ℃, the pressure in the reaction kettle is kept at 1.3-1.5MPa, and the stirring speed is 800-1000r/min.
3. The method for preparing fine recycled aggregate from waste concrete according to claim 1, wherein the method comprises the following steps: in the step S4, the mass of the diatomite is 3% -8% of that of the concrete particles, the pressure in the reaction kettle is 1.2-1.3MPa, and the carbon dioxide introducing time and the stirring time are 0.5-1h.
4. The method for preparing fine recycled aggregate from waste concrete according to claim 1, wherein the method comprises the following steps: the aggregate strengthening liquid comprises the following raw materials in parts by weight: 30-40 parts of silica fume, 25-35 parts of alumina powder, 60-80 parts of alkali liquor, 15-30 parts of sodium carbonate, 20-40 parts of inorganic filler, 10-20 parts of silicone resin, 5-10 parts of penetrant, 2-8 parts of dispersing agent, 3-8 parts of water reducer and 80-100 parts of water.
5. The method for preparing fine recycled aggregate from waste concrete according to claim 4, which is characterized in that: the aggregate strengthening liquid comprises the following raw materials in parts by weight: 32 parts of silica fume, 26 parts of alumina powder, 64 parts of alkali liquor, 17 parts of sodium carbonate, 24 parts of inorganic filler, 12 parts of silicone resin, 6 parts of penetrating agent, 3 parts of dispersing agent, 4 parts of water reducer and 85 parts of water.
6. The method for preparing fine recycled aggregate from waste concrete according to claim 4, which is characterized in that: the aggregate strengthening liquid comprises the following raw materials in parts by weight: 35 parts of silica fume, 28 parts of alumina powder, 70 parts of alkali liquor, 20 parts of sodium carbonate, 28 parts of inorganic filler, 14 parts of silicone resin, 7 parts of penetrating agent, 5 parts of dispersing agent, 5 parts of water reducer and 90 parts of water.
7. The method for preparing fine recycled aggregate from waste concrete according to claim 4, which is characterized in that: the aggregate strengthening liquid comprises the following raw materials in parts by weight: 37 parts of silica fume, 30 parts of alumina powder, 74 parts of alkali liquor, 24 parts of sodium carbonate, 34 parts of inorganic filler, 16 parts of silicone resin, 8 parts of penetrant, 6 parts of dispersing agent, 6 parts of water reducer and 95 parts of water.
8. The method for preparing fine recycled aggregate from waste concrete according to claim 4, which is characterized in that: the aggregate strengthening liquid comprises the following raw materials in parts by weight: 39 parts of silica fume, 32 parts of alumina powder, 78 parts of alkali liquor, 28 parts of sodium carbonate, 38 parts of inorganic filler, 18 parts of silicone resin, 9 parts of penetrant, 7 parts of dispersing agent, 7 parts of water reducer and 100 parts of water.
9. The method for preparing fine recycled aggregate from waste concrete according to claim 4, which is characterized in that: the alkali liquor is a mixed solution of potassium hydroxide and water glass, and the modulus of the water glass is adjusted to 1.0-1.2 by potassium hydroxide; the inorganic filler is calcium sulfoaluminate, aluminum oxide clinker, calcium chloride, magnesium sulfate and potassium dihydrogen phosphate according to the mass ratio of (1-4): (3-5): (2-6): (3-7): the mixture of (2-3), wherein the penetrating agent is one or more of isobutyl triethoxysilane, sodium alkylbenzenesulfonate, sodium alkyl sulfate, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether; the dispersing agent is one or more of magnesium stearate, zinc stearate and HPMA; the water reducer is a polycarboxylic acid high-efficiency water reducer.
10. The method for preparing fine recycled aggregate from waste concrete according to claim 1, wherein the method comprises the following steps: in the step S5, the soaking temperature is 25-30 ℃, the drying temperature is 50-60 ℃ and the drying time is 10-12h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116553876A (en) * | 2023-06-01 | 2023-08-08 | 中建新城建设工程有限公司 | Energy-saving green building material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116553876A (en) * | 2023-06-01 | 2023-08-08 | 中建新城建设工程有限公司 | Energy-saving green building material and preparation method thereof |
| CN116553876B (en) * | 2023-06-01 | 2024-01-09 | 中建新城建设工程有限公司 | Energy-saving green building material and preparation method thereof |
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