CN115246721A - Process for preparing cement stabilized macadam based on regenerated aggregate - Google Patents
Process for preparing cement stabilized macadam based on regenerated aggregate Download PDFInfo
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- CN115246721A CN115246721A CN202210948356.2A CN202210948356A CN115246721A CN 115246721 A CN115246721 A CN 115246721A CN 202210948356 A CN202210948356 A CN 202210948356A CN 115246721 A CN115246721 A CN 115246721A
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- aggregate
- cement
- regenerated
- regenerated aggregate
- recycled
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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
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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
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
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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
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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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
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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
Abstract
The scheme relates to a process for preparing cement stabilized macadam based on recycled aggregate, which comprises the following steps: recovering the waste cement concrete blocks; crushing the recycled waste cement concrete blocks by using an impact crusher to prepare regenerated aggregate; screening the regenerated aggregate to obtain regenerated aggregate with the particle size of 4.75-31.5 mm; carrying out strengthening treatment on the regenerated aggregate; spraying organic silicon resin on the surface of the reinforced aggregate to obtain modified regenerated aggregate; then mixing with natural aggregate, adding fly ash, polypropylene fiber material, cement and water, and stirring and uniformly dispersing to obtain the material. The invention carries out abrasion and spraying of organic silicon resin on the regenerated aggregate, prepares the regenerated cement stabilized macadam by compounding with the fly ash, the polypropylene fiber and the cement, and greatly improves the performances in the aspects of compressive strength, splitting strength, drying shrinkage resistance, fatigue life and the like; the utilization of solid resources is improved, and the influence on the environment is reduced.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a process for preparing cement stabilized macadam based on regenerated aggregate.
Background
In recent years, with the development of urban and rural areas in China, the pace of infrastructure construction is continuously accelerated, the quality of the urban and rural areas is improved, and meanwhile, a large amount of construction waste is generated, and especially, a large amount of waste concrete plates are generated in the processes of new rural area construction, suburban large development, urban reconstruction and extension, urban and rural highway upgrading and reconstruction and the like. The construction waste can be crushed to obtain recycled aggregate, so that the problem of resource shortage is relieved. In the prior art, hardened cement slurry exists on the surface of the regenerated aggregate obtained by crushing, and the engineering characteristics of the hardened cement slurry are mainly represented by the characteristics of small apparent density, high water absorption, high crushing value and the like, so that the regenerated cement stabilized macadam has low strength and poor durability, and is often applied to low strength requirement, and the application range of the regenerated cement stabilized macadam is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a process for preparing cement stabilized macadam based on regenerated aggregate, which can greatly improve the performances of the materials in the aspects of compressive strength, fatigue life and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
a process for preparing cement stabilized macadam based on recycled aggregate comprises the following steps:
step 1, recycling waste cement concrete blocks;
step 2, crushing the recycled waste cement concrete blocks by using a reaction crusher to prepare regenerated aggregates;
step 3, screening the regenerated aggregate obtained in the step 2 to obtain regenerated aggregate with the particle size of 4.75-31.5 mm;
step 4, performing strengthening treatment on the regenerated aggregate in the step 3;
step 5, spraying organic silicon resin on the surface of the aggregate subjected to strengthening treatment in the step 4, and maintaining for 24 hours at normal temperature to obtain modified regenerated aggregate;
and 6, mixing the modified regenerated aggregate obtained in the step 5 with natural aggregate, adding fly ash, a polypropylene fiber material, cement and water, and stirring and uniformly dispersing to obtain the modified regenerated aggregate.
Further, the specific process of the strengthening treatment in the step 4 is as follows:
A. drying the regenerated aggregate prepared in the step 3 at 150 ℃ for 3h, and then cooling to room temperature;
B. b, ball milling the recycled aggregate treated in the step A, and setting the number of steel balls: 4. 8 and 12, and 100, 300 and 500 turns are set for abrasion respectively.
Further, in the step 5, the pH value of the organic silicon resin is 6-7, the content of the effective components is 2-4%, and the balance is water.
Further, the mass fractions of the modified regenerated aggregate, the natural aggregate, the fly ash, the polypropylene fiber material, the cement and the water are respectively 40-60%, 20-45%, 0-8%, 0-0.5%, 5% and 5.5-7%.
By adopting the technical scheme, the obtained regenerated aggregate is subjected to strengthening treatment, and the strengthened aggregate is modified to prepare the modified regenerated aggregate, so that the strength of the regenerated aggregate is improved, and the application range of the cement stabilized macadam is further enlarged.
The cement is an important component in cement-stabilized macadam raw materials, and a product with cementing capacity is generated after hydration reaction of the cement, so that aggregates are wrapped and bonded with each other to form an integral continuous structure.
The fly ash belongs to an alkaline cementing material, and is fused with water to generate a similar cement hydration decomposition reaction, so that the integral strength of the cement stabilized macadam material is further enhanced.
The polypropylene fiber is taken as a material with better elastic toughness, and the polypropylene fiber is added mainly in the disordered distribution in the material mixing process, so that the lapping reinforcement effect among cement, aggregate, fly ash and the like is realized, the bonding effect of the internal material is improved, the integral stability of the internal material is enhanced, and the optimization and the enhancement of the internal structure of the material are carried out in the aspect of mechanical property.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention effectively utilizes the recycled aggregate to enhance, effectively reduces the hardened cement paste on the surface of the recycled aggregate, enhances the recycled aggregate by adding the fly ash and the polypropylene fiber, and better exerts the working performance of the recycled aggregate in cement macadam.
(2) The method provided by the invention has the advantages that the recycled aggregate is subjected to abrasion and is sprayed with the organic silicon resin, and the recycled cement stabilized macadam is prepared by compounding with the fly ash, the polypropylene fiber and the cement, so that the performances in the aspects of compressive strength, splitting strength, drying shrinkage resistance, fatigue life and the like are greatly improved, the fly ash and the polypropylene fiber are added, the compression resistance is superior to that of the traditional recycled cement stabilized macadam, and the ductility and the fracture energy are greatly improved; the utilization of solid resources is improved, and the influence on the environment is reduced.
Drawings
FIG. 1 is a graph showing the change of the relationship between the compressive strength of cement stabilized macadam obtained in examples 1 to 4 and the amount of reclaimed aggregate.
FIG. 2 is a graph showing the change of the relationship between the cleavage strength of the cement stabilized macadam obtained in examples 1 to 4 and the amount of the reclaimed aggregate.
FIG. 3 is a graph showing the change in the relationship between the drying shrinkage resistance and the amount of reclaimed aggregate incorporated in cement-stabilized macadam produced in examples 1 to 4.
FIG. 4 is a graph showing the relationship between fatigue life and the amount of recycled aggregate in cement stabilized macadam produced in examples 1 to 4.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1:
step 1, recycling waste cement concrete blocks;
step 2, crushing the recycled waste cement concrete blocks by using a reaction crusher to prepare regenerated aggregates;
step 3, screening the regenerated aggregate obtained in the step 2 to obtain regenerated aggregate with the particle size of 4.75-31.5 mm;
step 4, drying the regenerated aggregate prepared in the step 3 at 150 ℃ for 3h, and then cooling to room temperature; then ball milling is carried out, and the number of steel balls is set as follows: 4. 8 and 12, setting the rotation turns to be 100, 300 and 500 turns respectively for abrasion;
step 5, spraying organic silicon resin (with the pH value of 6-7, the content of active ingredients of 2-4 percent and the balance of water) on the surface of the aggregate subjected to strengthening treatment in the step 4, and curing for 24 hours at normal temperature to obtain modified regenerated aggregate;
and 6, mixing 40% of the modified regenerated aggregate obtained in the step 5 with 43% of natural aggregate, adding 6% of fly ash, 0.3% of polypropylene fiber material, 5% of cement and 5.7% of water, stirring uniformly, and dispersing to obtain the modified regenerated aggregate.
Example 2:
step 1, recycling waste cement concrete blocks;
step 2, crushing the recycled waste cement concrete blocks by using a reaction crusher to prepare regenerated aggregates;
step 3, screening the regenerated aggregate obtained in the step 2 to obtain regenerated aggregate with the particle size of 4.75-31.5 mm;
step 4, drying the regenerated aggregate prepared in the step 3 at 150 ℃ for 3h, and then cooling to room temperature; then ball milling is carried out, and the number of steel balls is set as follows: 4. 8 and 12, setting the rotation turns to be 100, 300 and 500 turns respectively for abrasion;
step 5, spraying organic silicon resin (with the pH value of 6-7, the content of active ingredients of 2-4 percent and the balance of water) on the surface of the aggregate subjected to strengthening treatment in the step 4, and curing for 24 hours at normal temperature to obtain modified regenerated aggregate;
and 6, mixing 50% of the modified regenerated aggregate obtained in the step 5 with 33% of natural aggregate, adding 6% of fly ash, 0.3% of polypropylene fiber material, 5% of cement and 5.7% of water, and uniformly mixing and dispersing to obtain the modified regenerated aggregate.
Example 3:
step 1, recycling waste cement concrete blocks;
step 2, crushing the recycled waste cement concrete blocks by using a reaction crusher to prepare regenerated aggregates;
step 3, screening the regenerated aggregate obtained in the step 2 to obtain regenerated aggregate with the particle size of 4.75-31.5 mm;
step 4, drying the regenerated aggregate prepared in the step 3 at 150 ℃ for 3h, and then cooling to room temperature; then ball milling is carried out, and the number of steel balls is set as follows: 4. 8 and 12, setting the rotation turns to be 100, 300 and 500 turns respectively for abrasion;
step 5, spraying organic silicon resin (with the pH value of 6-7, the content of active ingredients of 2-4 percent and the balance of water) on the surface of the aggregate subjected to strengthening treatment in the step 4, and curing for 24 hours at normal temperature to obtain modified regenerated aggregate;
and 6, mixing 60% of the modified regenerated aggregate obtained in the step 5 with 23% of natural aggregate, adding 6% of fly ash, 0.3% of polypropylene fiber material, 5% of cement and 5.7% of water, stirring uniformly, and dispersing to obtain the modified regenerated aggregate.
Example 4:
step 1, recycling waste cement concrete blocks;
step 2, crushing the recycled waste cement concrete blocks by using a reaction crusher to prepare regenerated aggregates;
step 3, screening the regenerated aggregate obtained in the step 2 to obtain regenerated aggregate with the particle size of 4.75-31.5 mm;
step 4, drying the regenerated aggregate prepared in the step 3 at 150 ℃ for 3h, and then cooling to room temperature; then ball milling is carried out, and the number of steel balls is set as follows: 4. 8 and 12, setting the rotation turns to be 100, 300 and 500 turns respectively for abrasion;
step 5, spraying organic silicon resin (with the pH value of 6-7, the content of active ingredients of 2-4 percent and the balance of water) on the surface of the aggregate subjected to strengthening treatment in the step 4, and curing for 24 hours at normal temperature to obtain modified regenerated aggregate;
and 6, mixing 70% of the modified regenerated aggregate obtained in the step 5 with 13% of natural aggregate, adding 6% of fly ash, 0.3% of polypropylene fiber material, 5% of cement and 5.7% of water, stirring uniformly, and dispersing to obtain the modified regenerated aggregate.
The mechanical property test is shown in figures 1-4, and the result shows that the cement stabilized macadam prepared by the method has excellent compressive strength, cleavage strength, drying shrinkage resistance and other properties, wherein the comprehensive properties are optimal when the mixing amount of the regenerated aggregate is 60%, and the bearing capacity and the deformation capacity of the cement macadam are improved under the synergistic effect of the fly ash and the polypropylene fibers.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (4)
1. A process for preparing cement stabilized macadam based on recycled aggregate is characterized by comprising the following steps:
step 1, recycling waste cement concrete blocks;
step 2, crushing the recycled waste cement concrete blocks by using a reaction crusher to prepare regenerated aggregates;
step 3, screening the regenerated aggregate obtained in the step 2 to obtain regenerated aggregate with the particle size of 4.75-31.5 mm;
step 4, performing strengthening treatment on the regenerated aggregate in the step 3;
step 5, spraying organic silicon resin on the surface of the aggregate subjected to strengthening treatment in the step 4, and curing for 24 hours at normal temperature to obtain modified regenerated aggregate;
and 6, mixing the modified regenerated aggregate obtained in the step 5 with natural aggregate, adding the fly ash, the polypropylene fiber material, the cement and the water, and uniformly mixing and dispersing to obtain the modified regenerated aggregate.
2. The process for preparing cement stabilized macadam based on reclaimed aggregate as claimed in claim 1, wherein the concrete procedure of the strengthening treatment in step 4 is:
A. drying the regenerated aggregate prepared in the step 3 at 150 ℃ for 3h, and then cooling to room temperature;
B. b, ball milling the recycled aggregate treated in the step A, and setting the number of steel balls: 4. 8 and 12, and 100, 300 and 500 turns respectively are set for abrasion.
3. The process for preparing cement-stabilized macadam based on reclaimed aggregate according to claim 1, wherein the pH of the silicone resin in step 5 is 6 to 7, the content of active ingredients is 2 to 4%, and the balance is water.
4. The process for preparing cement stabilized macadam based on recycled aggregates according to claim 1, wherein the mass fractions of the modified recycled aggregates, natural aggregates, fly ash, polypropylene fiber material, cement and water are 40-60%, 20-45%, 0-8%, 0-0.5%, 5% and 5.5-7%, respectively.
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| CN202210948356.2A CN115246721A (en) | 2022-08-09 | 2022-08-09 | Process for preparing cement stabilized macadam based on regenerated aggregate |
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| CN202210948356.2A CN115246721A (en) | 2022-08-09 | 2022-08-09 | Process for preparing cement stabilized macadam based on regenerated aggregate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011207647A (en) * | 2010-03-29 | 2011-10-20 | Sumitomo Osaka Cement Co Ltd | Method for recovering limestone macadam from concrete |
| CN105084820A (en) * | 2015-08-10 | 2015-11-25 | 湖北益通建设股份有限公司 | Method for preparing cement-stabilized macadam material through waste concrete |
| CN110002817A (en) * | 2019-03-20 | 2019-07-12 | 上海家根路基材料有限公司 | A kind of cement stabilized macadam material and its preparation process |
| CN113968686A (en) * | 2021-10-30 | 2022-01-25 | 深圳市正强混凝土有限公司 | Regeneration method of waste concrete and modified regenerated concrete |
| CN114230289A (en) * | 2022-01-15 | 2022-03-25 | 深圳市深建混凝土有限公司 | Green high-strength and high-toughness concrete and preparation process thereof |
-
2022
- 2022-08-09 CN CN202210948356.2A patent/CN115246721A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011207647A (en) * | 2010-03-29 | 2011-10-20 | Sumitomo Osaka Cement Co Ltd | Method for recovering limestone macadam from concrete |
| CN105084820A (en) * | 2015-08-10 | 2015-11-25 | 湖北益通建设股份有限公司 | Method for preparing cement-stabilized macadam material through waste concrete |
| CN110002817A (en) * | 2019-03-20 | 2019-07-12 | 上海家根路基材料有限公司 | A kind of cement stabilized macadam material and its preparation process |
| CN113968686A (en) * | 2021-10-30 | 2022-01-25 | 深圳市正强混凝土有限公司 | Regeneration method of waste concrete and modified regenerated concrete |
| CN114230289A (en) * | 2022-01-15 | 2022-03-25 | 深圳市深建混凝土有限公司 | Green high-strength and high-toughness concrete and preparation process thereof |
Non-Patent Citations (1)
| Title |
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| 李强等: "再生集料强化方法和掺量对水泥稳定碎石性能的影响", 《铁道科学与工程学报》 * |
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