CN114735984A - Recycled concrete and preparation method thereof - Google Patents
Recycled concrete and preparation method thereof Download PDFInfo
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- CN114735984A CN114735984A CN202210515369.0A CN202210515369A CN114735984A CN 114735984 A CN114735984 A CN 114735984A CN 202210515369 A CN202210515369 A CN 202210515369A CN 114735984 A CN114735984 A CN 114735984A
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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
- C04B28/04—Portland cements
-
- 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
- C04B28/06—Aluminous cements
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
Abstract
The invention discloses recycled concrete and a preparation method thereof, and relates to the technical field of concrete, wherein the recycled concrete is prepared from 400 parts of cement 320-. The invention takes cement, recycled coarse aggregate and recycled fine aggregate as the base materials of recycled concrete, and modifies the recycled coarse aggregate and the recycled fine aggregate, thereby reducing the microcracks and the water absorption rate in the recycled coarse aggregate, improving the microcracks and the water absorption rate of the recycled concrete, simultaneously enabling the produced recycled concrete to have higher compressive strength, enhancing the mechanical strength of the recycled concrete, recycling the waste concrete again, reducing the pollution to the environment and reducing the production cost.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to recycled concrete and a preparation method thereof.
Background
The regenerated concrete is prepared by crushing, cleaning and grading waste concrete blocks, mixing the crushed, cleaned and graded concrete blocks with a grading agent according to a certain proportion, partially or completely replacing coarse aggregates such as stones and the like, and then adding cement, water and the like. The waste concrete is used as the coarse aggregate, so that the waste concrete can be effectively recycled, the damage of solid wastes to the environment can be reduced, resources such as sand and stone can be saved, and the method is one of important ways for realizing sustainable development of the concrete industry. The following problems exist in the prior art:
1. after the waste concrete is dismantled, the waste concrete can be recycled, but when the waste concrete is recycled, a large amount of micro cracks can be generated in the recycled aggregate due to the fact that the waste concrete can be subjected to a large external force action in the crushing process, and the strength of the recycled concrete is affected;
2. the recycled aggregate is generated after the waste concrete is crushed, a large amount of cementing materials such as cement and the like are attached to the surface of the recycled aggregate in the using process, but the recycled aggregate is rough in the surface after being crushed, and the recycled aggregate has high water absorption rate, so that the performance of the prepared recycled concrete material is unstable.
Disclosure of Invention
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the recycled concrete is prepared from cement, water, recycled coarse aggregate, recycled fine aggregate, a water reducing agent, fly ash, broken stone and composite fiber, and comprises the following components in parts by weight:
400 portions of 320-cement (I) and 320-cement (II),
180 portions of 220 portions of water are added,
500 portions of regenerated coarse aggregate 450,
300 portions and 380 portions of recycled fine aggregate,
14-20 parts of a water reducing agent,
80-130 parts of fly ash,
380-460 parts of gravel,
100 portions and 150 portions of composite fiber.
The technical scheme of the invention is further improved as follows: the recycled coarse aggregate is prepared by crushing waste concrete, and the particle size of the recycled coarse aggregate is 5-30 mm.
The technical scheme of the invention is further improved as follows: the particle size of the recycled fine aggregate is 0.5-5mm, and the mass ratio of the recycled coarse aggregate to the fine aggregate is (10-15): (5-10).
The technical scheme of the invention is further improved as follows: the water reducing agent is any one of a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an HSB aliphatic water reducing agent.
The technical scheme of the invention is further improved as follows: the composite fiber is one or a mixture of more than two of steel fiber, polyacrylonitrile fiber and glass fiber.
The technical scheme of the invention is further improved as follows: the cement is any one of ordinary portland cement, aluminate cement, composite portland cement, sulfate-resistant portland cement and rapid-hardening portland cement.
The preparation method of the recycled concrete comprises the following steps:
s1: preparing regenerated coarse aggregate, crushing the waste concrete, screening the crushed waste concrete to obtain waste concrete particles, modifying the regenerated coarse aggregate with the particle size of 5-30mm by using a styrene solution, stirring by using a mechanical stirring method to fully soak the regenerated coarse aggregate and the styrene solution, filtering after soaking for 5-6 hours, and collecting filter residue after filtering;
s2: preparing a regenerated fine aggregate, grinding the screened regenerated coarse aggregate again, screening the ground product, repeating for many times to grind the regenerated fine aggregate particles to 0.5-5mm, and matching the regenerated coarse aggregate and the regenerated fine aggregate, wherein the mass matching value is 2: 1;
s3: weighing cement, water, fly ash and gravel according to the weight parts, mixing and stirring for 25-30min at the rotating speed of 250-300r/min to obtain cement slurry;
s4: adding the regenerated coarse aggregate, the regenerated fine aggregate and the composite fiber into the cement slurry, and mixing and stirring again at the rotating speed of 250-300r/min to obtain a cement mixture;
s5: adding a water reducing agent into the recycled concrete mixed solution at the temperature of 18-32 ℃, and mixing and stirring again at the rotating speed of 250-300r/min for 5-9min to obtain the recycled concrete.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that:
1. the invention provides a recycled concrete and a preparation method thereof, which take cement, recycled coarse aggregate and recycled fine aggregate as base materials of the recycled concrete, and modify the recycled coarse aggregate and the recycled fine aggregate, thereby reducing micro cracks and water absorption in the recycled coarse aggregate, improving the micro cracks and the water absorption of the recycled concrete, simultaneously enabling the produced recycled concrete to have higher compressive strength, enhancing the mechanical strength of the recycled concrete, recycling the waste concrete again, reducing the pollution to the environment and reducing the production cost.
2. The invention provides a recycled concrete and a preparation method thereof, wherein composite fibers and a water reducing agent are added into the recycled concrete, and the water reducing agent is added, so that cement particles in the recycled concrete added with the water reducing agent have a dispersing effect, the unit water consumption can be reduced, the fluidity of the recycled concrete is improved, the cement consumption of the recycled concrete can be reduced, and the crack resistance and the toughness of the produced recycled concrete can be greatly improved through the added mixture of steel fibers, polyacrylonitrile fibers and glass fibers, so that the compressive strength of the recycled concrete can be improved, and the generation of micro cracks in the recycled concrete can be reduced.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
the invention provides a technical scheme, a recycled concrete and a preparation method thereof, the recycled concrete is prepared from cement, water, recycled coarse aggregate, recycled fine aggregate, a water reducing agent, fly ash, broken stone and composite fiber, the recycled coarse aggregate is prepared by crushing waste concrete, the particle size of the recycled coarse aggregate is 5-30mm, the particle size of the recycled fine aggregate is 0.5-5mm, and the mass ratio of the recycled coarse aggregate to the fine aggregate is (10-15): (5-10), the water reducing agent is any one of a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an HSB aliphatic water reducing agent, the composite fiber is one or a mixture of more than two of steel fiber, polyacrylonitrile fiber and glass fiber, and the cement is any one of ordinary portland cement, aluminate cement, composite portland cement, sulfate-resistant portland cement and quick-hardening portland cement.
Example 1
The weight ratio of each component is as follows:
330 parts of cement, namely, 330 parts of cement,
180 parts of water, namely adding 180 parts of water,
450 parts of regenerated coarse aggregate, namely, the recycled coarse aggregate,
300 parts of recycled fine aggregate,
14 parts of a water reducing agent, namely,
80 parts of fly ash, namely 80 parts of fly ash,
380 parts of broken stone,
100 parts of composite fiber, namely 100 parts of composite fiber,
s1: preparing regenerated coarse aggregate, crushing waste concrete, screening the crushed waste concrete to obtain waste concrete particles, modifying the regenerated coarse aggregate with the particle size of 6mm by using a styrene solution, stirring by using a mechanical stirring method to fully soak the regenerated coarse aggregate and the styrene solution, filtering after soaking for 5 hours, and collecting filter residue after filtering;
s2: preparing a regenerated fine aggregate, grinding the screened regenerated coarse aggregate again, screening the ground product, repeating for many times to grind the regenerated fine aggregate particles to 1mm, and matching the regenerated coarse aggregate particles with the regenerated fine aggregate particles, wherein the mass ratio is 10: 5;
s3: weighing cement, water, fly ash and broken stone according to the weight parts, mixing and stirring for 25min at the rotating speed of 250r/min to obtain cement slurry;
s4: adding the recycled coarse aggregate, the recycled fine aggregate and the composite fiber into the cement slurry, and mixing and stirring again at the rotating speed of 250r/min to obtain a cement mixture;
s5: and adding a water reducing agent into the recycled concrete mixed solution at the temperature of 18 ℃, and mixing and stirring again at the rotating speed of 250r/min for 5min to obtain the recycled concrete.
Example 2
The weight ratio of each component is as follows:
340 parts of cement, namely 340 parts of cement,
190 parts of water, namely,
460 parts of recycled coarse aggregate,
310 parts of recycled fine aggregate, namely, 310 parts of recycled fine aggregate,
15 parts of a water reducing agent, namely,
90 parts of fly ash, namely mixing the fly ash,
390 portions of broken stone,
110 parts of composite fibers, namely, composite fibers,
a: preparing regenerated coarse aggregate, crushing waste concrete, screening the crushed waste concrete to obtain waste concrete particles, modifying the regenerated coarse aggregate with the particle size of 8 mm by using a styrene solution, stirring by using a mechanical stirring method to fully soak the regenerated coarse aggregate and the styrene solution, filtering after soaking for 5.2 hours, and collecting filter residue after filtering;
b: preparing regenerated fine aggregate, grinding the screened regenerated coarse aggregate again, screening the ground product, repeating for many times to grind the regenerated coarse aggregate particles to 2mm, and matching the regenerated coarse aggregate particles with the regenerated fine aggregate particles, wherein the mass ratio value is 11: 6;
c: weighing cement, water, fly ash and broken stone according to the weight parts, mixing and stirring for 26min at the rotating speed of 260r/min to obtain cement slurry;
d: adding the recycled coarse aggregate, the recycled fine aggregate and the composite fiber into the cement slurry, and mixing and stirring again at the rotating speed of 260r/min to obtain a cement mixture;
e: and adding a water reducing agent into the recycled concrete mixed solution at the temperature of 19 ℃, and mixing and stirring again at the rotating speed of 260r/min for 6min to obtain the recycled concrete.
Example 3
The weight ratio of each component is as follows:
350 parts of cement, namely cement, wherein,
200 parts of water, namely 200 parts of water,
470 parts of recycled coarse aggregate,
320 parts of recycled fine aggregate, namely 320 parts of recycled fine aggregate,
16 parts of a water reducing agent, namely,
100 parts of fly ash, namely 100 parts of fly ash,
400 parts of broken stone,
120 parts of composite fibers, namely, 120 parts of composite fibers,
a: preparing regenerated coarse aggregate, crushing waste concrete, screening the crushed waste concrete to obtain waste concrete particles, modifying the regenerated coarse aggregate with the particle size of 10 mm by using a styrene solution, stirring by using a mechanical stirring method to fully soak the regenerated coarse aggregate and the styrene solution, filtering after soaking for 5.4 hours, and collecting filter residue after filtering;
b: preparing a regenerated fine aggregate, grinding the screened regenerated coarse aggregate again, screening the ground product, repeating for many times to grind the regenerated fine aggregate particles to 3mm, and matching the regenerated coarse aggregate particles with the regenerated fine aggregate particles, wherein the mass ratio is 12: 7;
c: weighing cement, water, fly ash and broken stone according to the weight parts, and mixing and stirring for 27min at the rotating speed of 270r/min to obtain cement slurry;
d: adding the recycled coarse aggregate, the recycled fine aggregate and the composite fiber into the cement slurry, and mixing and stirring again at the rotating speed of 270r/min to obtain a cement mixture;
e: and adding a water reducing agent into the recycled concrete mixed solution at the temperature of 20 ℃, and mixing and stirring again at the rotating speed of 270r/min for 7min to obtain the recycled concrete.
Example 4
The weight ratio of each component is as follows:
360 parts of cement, namely, cement,
205 parts of water, namely, water,
480 parts of a recycled coarse aggregate, namely a recycled coarse aggregate,
330 parts of recycled fine aggregate, namely 330 parts of recycled fine aggregate,
17 parts of a water reducing agent, namely,
110 parts of fly ash, namely, coal ash,
410 parts of broken stone,
130 parts of composite fibers, namely 130 parts of composite fibers,
a: preparing regenerated coarse aggregate, crushing waste concrete, screening the crushed waste concrete to obtain waste concrete particles, modifying the regenerated coarse aggregate with the particle size of 13 mm by using a styrene solution, stirring by using a mechanical stirring method to fully soak the regenerated coarse aggregate and the styrene solution, filtering after soaking for 5.5 hours, and collecting filter residue after filtering;
b: preparing recycled fine aggregate, grinding the screened recycled coarse aggregate again, screening the ground product, repeating for many times to grind the recycled fine aggregate particles to 3.5mm, and proportioning the recycled coarse aggregate particles and the recycled fine aggregate particles, wherein the mass ratio is 12: 8;
c: weighing cement, water, fly ash and broken stone according to the weight parts, mixing and stirring for 28min at the rotating speed of 280r/min to obtain cement slurry;
d: adding the recycled coarse aggregate, the recycled fine aggregate and the composite fiber into the cement slurry, and mixing and stirring again at the rotating speed of 280r/min to obtain a cement mixture;
e: and adding a water reducing agent into the recycled concrete mixed solution at the temperature of 21 ℃, and mixing and stirring again at the rotating speed of 280r/min for 7min to obtain the recycled concrete.
Example 5
The weight ratio of each component is as follows:
370 parts of cement, namely cement, wherein the cement comprises the following components,
210 parts of water, namely, water,
490 parts of a recycled coarse aggregate,
340 parts of recycled fine aggregate, namely 340 parts of recycled fine aggregate,
18 parts of a water reducing agent, namely,
120 parts of fly ash, namely 120 parts of fly ash,
420 parts of broken stone, namely 420 parts of stone,
140 parts of composite fiber, namely 140 parts of composite fiber,
a: preparing regenerated coarse aggregate, crushing waste concrete, screening the crushed waste concrete to obtain waste concrete particles, modifying the regenerated coarse aggregate with the particle size of 16 mm by using a styrene solution, stirring by using a mechanical stirring method to fully soak the regenerated coarse aggregate and the styrene solution, filtering after soaking for 5.6 hours, and collecting filter residue after filtering;
b: preparing a regenerated fine aggregate, grinding the screened regenerated coarse aggregate again, screening the ground product, repeating for many times to grind the regenerated fine aggregate particles to 4mm, and matching the regenerated coarse aggregate and the regenerated fine aggregate, wherein the mass matching value is 13: 9;
c: weighing cement, water, fly ash and broken stone according to the weight parts, mixing and stirring for 29min at the rotating speed of 290r/min to obtain cement slurry;
d: adding the regenerated coarse aggregate, the regenerated fine aggregate and the composite fiber into the cement slurry, and mixing and stirring again at the rotating speed of 290r/min to obtain a cement mixture;
e: and adding a water reducing agent into the recycled concrete mixed solution at the temperature of 23 ℃, and mixing and stirring again at the rotating speed of 290r/min for 8min to obtain the recycled concrete.
The invention has the beneficial effects that: the cement, the recycled coarse aggregate and the recycled fine aggregate are used as base materials of recycled concrete and are modified, so that microcracks and water absorption in the recycled coarse aggregate are reduced, microcracks and water absorption of the recycled concrete are improved, the produced recycled concrete has high compressive strength, the mechanical strength of the recycled concrete is enhanced, the waste concrete can be recycled, the pollution to the environment is reduced, the production cost can be reduced, the composite fiber and the water reducing agent are added into the recycled concrete, the cement particles in the recycled concrete added with the water reducing agent have a dispersing effect by adding the water reducing agent, the unit water consumption can be reduced, the flowability of the recycled concrete can be improved, the cement consumption of the recycled concrete can be reduced, and the steel fiber, the cement and the like, The mixture of polyacrylonitrile fiber and glass fiber can greatly improve the crack resistance and toughness of the produced recycled concrete, thereby improving the compressive strength of the recycled concrete and reducing the generation of micro-cracks in the recycled concrete.
The present invention has been described in general terms in the foregoing, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Therefore, modifications or improvements are within the scope of the invention without departing from the spirit of the inventive concept.
Claims (7)
1. A recycled concrete characterized by: the recycled concrete is prepared from cement, water, recycled coarse aggregate, recycled fine aggregate, a water reducing agent, fly ash, broken stone and composite fiber, and the weight ratio of each component is as follows:
the cement is 320-400 parts,
180 portions of 220 portions of water are added,
500 portions of regenerated coarse aggregate 450,
300 portions and 380 portions of recycled fine aggregate,
14-20 parts of a water reducing agent,
80-130 parts of fly ash,
380-460 parts of gravel,
100 portions and 150 portions of composite fiber.
2. A recycled concrete as claimed in claim 1, wherein: the recycled coarse aggregate is prepared by crushing waste concrete, and the particle size of the recycled coarse aggregate is 5-30 mm.
3. A recycled concrete as claimed in claim 1, wherein: the particle size of the recycled fine aggregate is 0.5-5mm, and the mass ratio of the recycled coarse aggregate to the fine aggregate is (10-15): (5-10).
4. A recycled concrete as claimed in claim 1, wherein: the water reducing agent is any one of a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an HSB aliphatic water reducing agent.
5. A recycled concrete as claimed in claim 1, wherein: the composite fiber is one or a mixture of more than two of steel fiber, polyacrylonitrile fiber and glass fiber.
6. A recycled concrete as claimed in claim 1, wherein: the cement is any one of ordinary portland cement, aluminate cement, composite portland cement, sulfate-resistant portland cement and rapid-hardening portland cement.
7. The preparation method of the recycled concrete is characterized by comprising the following steps of:
s1: preparing regenerated coarse aggregate, crushing the waste concrete, screening the crushed waste concrete to obtain waste concrete particles, modifying the regenerated coarse aggregate with the particle size of 5-30mm by using a styrene solution, stirring by using a mechanical stirring method to fully soak the regenerated coarse aggregate and the styrene solution, filtering after soaking for 5-6 hours, and collecting filter residue after filtering;
s2: preparing a regenerated fine aggregate, grinding the screened regenerated coarse aggregate again, screening the ground product, repeating for many times to grind the regenerated fine aggregate particles to 0.5-5mm, and proportioning the regenerated coarse aggregate and the regenerated fine aggregate, wherein the mass ratio value is (10-15) to (5-10);
s3: weighing cement, water, fly ash and gravel according to the weight parts, mixing and stirring for 25-30min at the rotating speed of 250-300r/min to obtain cement slurry;
s4: adding the regenerated coarse aggregate, the regenerated fine aggregate and the composite fiber into the cement slurry, and mixing and stirring again at the rotating speed of 250-300r/min to obtain a cement mixture;
s5: adding a water reducing agent into the recycled concrete mixed solution at the temperature of 18-32 ℃, and mixing and stirring again at the rotating speed of 250-300r/min for 5-9min to obtain the recycled concrete.
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| CN115490490A (en) * | 2022-09-27 | 2022-12-20 | 溧阳市交通工程建设事业发展中心 | Environment-friendly asphalt concrete formula and preparation method thereof |
| CN115893951A (en) * | 2022-12-13 | 2023-04-04 | 河北雄安昝岗混凝土有限公司 | High-compactness recycled concrete and preparation method thereof |
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Application publication date: 20220712 |