CN113354350A - Processing technology of recycled aggregate concrete - Google Patents
Processing technology of recycled aggregate concrete Download PDFInfo
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- CN113354350A CN113354350A CN202110755101.XA CN202110755101A CN113354350A CN 113354350 A CN113354350 A CN 113354350A CN 202110755101 A CN202110755101 A CN 202110755101A CN 113354350 A CN113354350 A CN 113354350A
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- recycled aggregate
- polyvinyl alcohol
- reinforced
- recycled
- concrete
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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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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 a processing technology of recycled aggregate concrete, relating to the technical field of recycled aggregate concrete and comprising the following steps: crushing and screening the recycled aggregate to respectively obtain coarse recycled aggregate and medium recycled aggregate; dispersing cellulose fibers into a polyvinyl alcohol aqueous solution to obtain a reinforced impregnation liquid; placing the coarse and medium recycled aggregates into a strengthening impregnation liquid, vacuumizing, then decompressing, vacuumizing again, filtering, cleaning and drying to obtain a strengthening recycled aggregate I; mixing the reinforced recycled aggregate I and part of polyvinyl alcohol fibers, stirring, spraying cement slurry on the surface of the mixture, and drying to obtain a reinforced recycled aggregate II; and mixing the cement and the residual polyvinyl alcohol fibers, stirring, adding water for stirring, and finally adding the reinforced recycled aggregate II and the water reducing agent to obtain the recycled aggregate concrete. The recycled concrete prepared by the invention has higher mechanical property, the compressive strength is more than or equal to 8.43MPa, and the splitting tensile strength is more than 1.95 MPa.
Description
Technical Field
The invention relates to the technical field of recycled aggregate concrete, in particular to a processing technology of recycled aggregate concrete.
Background
At present, the demand of global concrete increases with the acceleration and daily increase of economic development and urbanization progress, and the problems are that a large amount of natural aggregate is consumed and a large amount of construction waste is generated due to the removal of concrete with expired service life.
The regenerated aggregate concrete, called regenerated concrete for short, is a new concrete prepared by crushing, cleaning and grading waste concrete blocks to prepare regenerated aggregate, mixing the regenerated aggregate with the graded aggregate according to a certain proportion and partially or completely replacing natural aggregate, and can effectively realize the recycling of resources. However, the recycled aggregate prepared only by simple crushing and screening processes has many edges and corners, rough surface, and hardened cement mortar contained in the components, and in addition, a large amount of micro cracks are accumulated in the concrete block due to damage in the crushing process, so that the porosity, the water absorption, the bulk density and the porosity of the recycled aggregate are large, the crushing index is high, the strength of the recycled aggregate concrete is low, and the application of the recycled aggregate concrete in load-bearing members and structures is limited.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a processing technology of recycled aggregate concrete.
The invention provides a processing technology of recycled aggregate concrete, which comprises the following steps:
s1, crushing and screening the recycled aggregate to respectively obtain coarse recycled aggregate and medium recycled aggregate;
s2, dispersing cellulose fibers into a polyvinyl alcohol aqueous solution to obtain a reinforced impregnation liquid;
s3, placing the coarse and medium recycled aggregates into a strengthening impregnation liquid, vacuumizing, then decompressing, vacuumizing again, filtering, cleaning and drying to obtain a strengthening recycled aggregate I;
s4, mixing the reinforced recycled aggregate I with a part of polyvinyl alcohol fibers, stirring, spraying cement slurry on the surface of the mixture, and drying to obtain a reinforced recycled aggregate II;
and S5, mixing the cement with the residual polyvinyl alcohol fibers, stirring, adding water for stirring, and finally adding the reinforced recycled aggregate II and the water reducing agent to obtain the recycled aggregate concrete.
Preferably, in S1, the particle diameters of the coarse recycled aggregate and the medium recycled aggregate are respectively 7.5-12 mm and 4.75-7.5 mm, and the mass ratio is 30-40: 30-40.
Preferably, in S2, the mass ratio of the cellulose fibers to the polyvinyl alcohol in the strengthening impregnation liquid is 1-3: 10; the mass percentage concentration of the polyvinyl alcohol aqueous solution is 0.5-2%.
Preferably, in S3, the coarse and medium recycled aggregates are placed in the strengthening impregnation liquid, and the ratio of the materials to the liquid is 1: 20 to 30.
Preferably, in S3, vacuumizing is performed, the pressure is maintained for 30-60 min to-0.085-0.095 MPa within 30-40 min, then the pressure is relieved to normal pressure, vacuumizing is performed again, the pressure is maintained for 30-60 min to-0.085-0.095 MPa within 30-40 min.
Preferably, the doping amount of the polyvinyl alcohol fiber in each cubic concrete mortar is 0.9-1.2 kg/m3。
Preferably, in S4 and S5, the mass percentage of the polyvinyl alcohol fibers is 15-25: 75-85.
Preferably, in S4, the mass-to-volume ratio of the reinforced recycled aggregate I to the cement mortar is kg/m3Is 1.5X 104～2.0×104: 1; the water cement ratio of the cement mortar is 0.8: 1.
has the advantages that: the invention provides a processing technology of recycled aggregate concrete, which comprises the steps of carrying out chemical reinforcement on recycled aggregates by using cellulose fibers, dispersing the cellulose fibers in a polyvinyl alcohol aqueous solution to obtain a uniform and stable mixed solution due to the fact that the surfaces of the cellulose fibers are rich in hydroxyl groups and can generate hydrogen bonding with polyvinyl alcohol, then enabling the cellulose fibers to enter pores and cracks of the recycled aggregates along with the polyvinyl alcohol in the vacuumizing process, bonding and filling the pores, improving the brittleness and strength of the recycled aggregates, improving the structural stability of the recycled aggregates and having a good reinforcement effect; mixing the reinforced recycled aggregate with part of polyvinyl alcohol fibers, wherein a polyvinyl alcohol film on the surface of the recycled aggregate has good affinity with the polyvinyl alcohol fibers, mixing the reinforced recycled aggregate with the polyvinyl alcohol fibers, spraying a small amount of cement slurry, and well dispersing and wrapping the small amount of polyvinyl alcohol fibers on the surface of the recycled aggregate while reinforcing; and finally, mixing the cement with the rest polyvinyl alcohol fibers, adding water for mixing, and adding the reinforced recycled aggregate, wherein the fibers and other components form good binding power and further wrap the surface of the recycled aggregate, and the dispersion uniformity is high. The recycled concrete prepared by the invention has higher mechanical property, the compressive strength is more than or equal to 8.43MPa, and the splitting tensile strength is more than 1.95 MPa.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
The invention provides a processing technology of recycled aggregate concrete, which comprises the following steps:
s1, crushing and screening the recycled aggregate to respectively obtain coarse recycled aggregate and medium recycled aggregate; wherein the particle diameters of the coarse recycled aggregate and the medium recycled aggregate are respectively 7.5-12 mm and 4.75-7.5 mm, and the mass ratio is 30: 30, of a nitrogen-containing gas;
s2, dispersing cellulose fibers into a polyvinyl alcohol aqueous solution to obtain a reinforced impregnation liquid; wherein the mass ratio of the cellulose fibers to the polyvinyl alcohol is 1: 10, the mass percentage concentration of the polyvinyl alcohol aqueous solution is 0.5 percent;
s3, placing the coarse and medium recycled aggregates into a strengthening impregnation liquid, wherein the material-liquid ratio is 1: 20, vacuumizing, controlling the pressure to be-0.085 MPa within 30min, keeping for 30min, then decompressing to the normal pressure, vacuumizing again, controlling the pressure to be-0.085 MPa within 30min, keeping for 30min, filtering, cleaning and drying to obtain reinforced recycled aggregate I;
s4, mixing the reinforced recycled aggregate I with a part of polyvinyl alcohol fibers, stirring, spraying cement slurry on the surface of the mixture, and drying to obtain a reinforced recycled aggregate II; wherein, the doping amount of the polyvinyl alcohol fiber in each cubic concrete mortar is 0.9kg/m3And in S4 and S5, the mass percent of the polyvinyl alcohol fibers is 15: 85 parts by weight; the mass volume ratio of the reinforced recycled aggregate I to the cement mortar is kg/m3Is 1.5X 104: 1; the water cement ratio of the cement mortar is 0.8: 1;
and S5, mixing the cement with the residual polyvinyl alcohol fibers, stirring, adding water for stirring, and finally adding the reinforced recycled aggregate II and the water reducing agent to obtain the recycled aggregate concrete.
Example 2
The invention provides a processing technology of recycled aggregate concrete, which comprises the following steps:
s1, crushing and screening the recycled aggregate to respectively obtain coarse recycled aggregate and medium recycled aggregate; wherein the particle diameters of the coarse recycled aggregate and the medium recycled aggregate are respectively 7.5-12 mm and 4.75-7.5 mm, and the mass ratio is 30: 35;
s2, dispersing cellulose fibers into a polyvinyl alcohol aqueous solution to obtain a reinforced impregnation liquid; wherein the mass ratio of the cellulose fibers to the polyvinyl alcohol is 1.5: 10, the mass percentage concentration of the polyvinyl alcohol aqueous solution is 1 percent;
s3, placing the coarse and medium recycled aggregates into a strengthening impregnation liquid, wherein the material-liquid ratio is 1: 24, vacuumizing, controlling the pressure to be-0.09 MPa within 35min, keeping for 40min, then decompressing to the normal pressure, vacuumizing again, controlling the pressure to be-0.09 MPa within 35min, keeping for 40min, filtering, cleaning and drying to obtain the reinforced recycled aggregate I;
s4, mixing the reinforced recycled aggregate I with a part of polyvinyl alcohol fibers, stirring, spraying cement slurry on the surface of the mixture, and drying to obtain a reinforced recycled aggregate II; wherein, the doping amount of the polyvinyl alcohol fiber in each cubic concrete mortar is 1.0kg/m3And in S4 and S5, the mass percent of the polyvinyl alcohol fibers is 20: 80; the mass volume ratio of the reinforced recycled aggregate I to the cement mortar is kg/m3Is 1.7X 104: 1; the water cement ratio of the cement mortar is 0.8: 1;
and S5, mixing the cement with the residual polyvinyl alcohol fibers, stirring, adding water for stirring, and finally adding the reinforced recycled aggregate II and the water reducing agent to obtain the recycled aggregate concrete.
Example 3
The invention provides a processing technology of recycled aggregate concrete, which comprises the following steps:
s1, crushing and screening the recycled aggregate to respectively obtain coarse recycled aggregate and medium recycled aggregate; wherein the particle diameters of the coarse recycled aggregate and the medium recycled aggregate are respectively 7.5-12 mm and 4.75-7.5 mm, and the mass ratio is 30: 40;
s2, dispersing cellulose fibers into a polyvinyl alcohol aqueous solution to obtain a reinforced impregnation liquid; wherein the mass ratio of the cellulose fibers to the polyvinyl alcohol is 2: 10, the mass percentage concentration of the polyvinyl alcohol aqueous solution is 1.5 percent;
s3, placing the coarse and medium recycled aggregates into a strengthening impregnation liquid, wherein the material-liquid ratio is 1: 27, vacuumizing, controlling the pressure to be-0.09 MPa within 40min, keeping for 50min, then decompressing to the normal pressure, vacuumizing again, controlling the pressure to be-0.09 MPa within 40min, keeping for 50min, filtering, cleaning and drying to obtain the reinforced recycled aggregate I;
s4, mixing the reinforced recycled aggregate I with a part of polyvinyl alcohol fibers, stirring, spraying cement slurry on the surface of the mixture, and drying to obtain a reinforced recycled aggregate II; wherein, the doping amount of the polyvinyl alcohol fiber in each cubic concrete mortar is 1.1kg/m3And in S4 and S5, the mass percent of the polyvinyl alcohol fibers is 20: 80; the mass volume ratio of the reinforced recycled aggregate I to the cement mortar is kg/m3Is 1.8X 104: 1; the water cement ratio of the cement mortar is 0.8: 1;
and S5, mixing the cement with the residual polyvinyl alcohol fibers, stirring, adding water for stirring, and finally adding the reinforced recycled aggregate II and the water reducing agent to obtain the recycled aggregate concrete.
Example 4
The invention provides a processing technology of recycled aggregate concrete, which comprises the following steps:
s1, crushing and screening the recycled aggregate to respectively obtain coarse recycled aggregate and medium recycled aggregate; wherein the particle diameters of the coarse recycled aggregate and the medium recycled aggregate are respectively 7.5-12 mm and 4.75-7.5 mm, and the mass ratio is 40: 30, of a nitrogen-containing gas;
s2, dispersing cellulose fibers into a polyvinyl alcohol aqueous solution to obtain a reinforced impregnation liquid; wherein the mass ratio of the cellulose fibers to the polyvinyl alcohol is 3: 10, the mass percentage concentration of the polyvinyl alcohol aqueous solution is 2 percent;
s3, placing the coarse and medium recycled aggregates into a strengthening impregnation liquid, wherein the material-liquid ratio is 1: 30, vacuumizing, controlling the pressure to be-0.095 MPa within 40min, keeping for 60min, then decompressing to the normal pressure, vacuumizing again, controlling the pressure to be-0.095 MPa within 40min, keeping for 60min, filtering, cleaning and drying to obtain the reinforced recycled aggregate I;
s4, mixing the reinforced recycled aggregate I and part of polyvinyl alcohol fibers, stirring, and spraying the cement slurryDrying the surface of the aggregate to obtain reinforced recycled aggregate II; wherein, the doping amount of the polyvinyl alcohol fiber in each cubic concrete mortar is 1.2kg/m3And in S4 and S5, the mass percent of the polyvinyl alcohol fibers is 25: 75; the mass volume ratio of the reinforced recycled aggregate I to the cement mortar is kg/m3Is 2.0X 104: 1; the water cement ratio of the cement mortar is 0.8: 1;
and S5, mixing the cement with the residual polyvinyl alcohol fibers, stirring, adding water for stirring, and finally adding the reinforced recycled aggregate II and the water reducing agent to obtain the recycled aggregate concrete.
Comparative example 1
The invention provides a processing technology of recycled aggregate concrete, which comprises the following steps:
s1, crushing and screening the recycled aggregate to respectively obtain coarse recycled aggregate and medium recycled aggregate; wherein the particle diameters of the coarse recycled aggregate and the medium recycled aggregate are respectively 7.5-12 mm and 4.75-7.5 mm, and the mass ratio is 30: 40;
and S2, mixing the cement and the polyvinyl alcohol fibers, stirring, adding water for stirring, and finally adding the coarse and medium recycled aggregate and the water reducing agent to obtain the recycled aggregate concrete.
Comparative example 2
Compared with the embodiment 3, the difference is only that the step of S2 is different, specifically: s2, using a polyvinyl alcohol aqueous solution as a strengthening impregnation liquid; wherein, the mass percentage concentration of the polyvinyl alcohol aqueous solution is 1.5%.
Comparative example 3
Compared with the embodiment 3, the difference is only that the step of S3 is different, specifically: s3, placing the coarse and medium recycled aggregates into a strengthening impregnation liquid, wherein the material-liquid ratio is 1: 27, vacuumizing, controlling the pressure to be-0.09 MPa within 40min, keeping for 140min, filtering, cleaning and drying to obtain the reinforced recycled aggregate I.
Comparative example 4
Compared with the example 3, the difference is only that the step of S4 is different, and the incorporation amount of the polyvinyl alcohol fiber in the example 3 and the comparative example 4 is the same, specifically: s4, spraying the cement slurry on the surface of the reinforced recycled aggregate I, and drying to obtain a reinforced recycled aggregate II; wherein the regenerated bone is strengthenedThe mass-volume ratio of the material I to the cement mortar is kg/m3Is 1.8X 104: 1; the water cement ratio of the cement mortar is 0.8: 1.
the properties of the recycled aggregate concrete prepared in examples 1 to 4 of the present invention and comparative examples 1 to 4 were examined.
The detection method comprises the following steps: the test pieces are mixed by a forced concrete mixer SJD60 model, are loaded and compacted by two times, are demoulded after being molded for 1d, and are conveyed to a curing room for standard curing for 28 d. The test piece size is 100mm multiplied by 6, and the average value is taken as the measured value of the index to be measured of the group of test pieces during the test. The compression strength and the splitting tensile strength are carried out according to the standard of the test method of the mechanical properties of common concrete (GB/T50081-2002), and the test instrument is a WAW-600C universal tester.
The specific test results are shown in Table 1.
TABLE 1 Performance data for recycled aggregate concrete prepared
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The processing technology of the recycled aggregate concrete is characterized by comprising the following steps:
s1, crushing and screening the recycled aggregate to respectively obtain coarse recycled aggregate and medium recycled aggregate;
s2, dispersing cellulose fibers into a polyvinyl alcohol aqueous solution to obtain a reinforced impregnation liquid;
s3, placing the coarse and medium recycled aggregates into a strengthening impregnation liquid, vacuumizing, then decompressing, vacuumizing again, filtering, cleaning and drying to obtain a strengthening recycled aggregate I;
s4, mixing the reinforced recycled aggregate I with a part of polyvinyl alcohol fibers, stirring, spraying cement slurry on the surface of the mixture, and drying to obtain a reinforced recycled aggregate II;
and S5, mixing the cement with the residual polyvinyl alcohol fibers, stirring, adding water for stirring, and finally adding the reinforced recycled aggregate II and the water reducing agent to obtain the recycled aggregate concrete.
2. The processing technology of recycled aggregate concrete according to claim 1, wherein in S1, the particle sizes of the coarse recycled aggregate and the medium recycled aggregate are respectively 7.5-12 mm and 4.75-7.5 mm, and the mass ratio of the coarse recycled aggregate to the medium recycled aggregate is 30-40: 30-40.
3. The recycled aggregate concrete processing process of claim 1 or 2, wherein in the S2, the mass ratio of the cellulose fibers to the polyvinyl alcohol in the strengthening impregnation liquid is 1-3: 10; the mass percentage concentration of the polyvinyl alcohol aqueous solution is 0.5-2%.
4. The recycled aggregate concrete processing process of any one of claims 1 to 3, wherein in S3, the coarse and medium recycled aggregates are placed in a strengthening impregnation liquid, and the ratio of the materials to the liquids is 1: 20 to 30.
5. The recycled aggregate concrete processing process of any one of claims 1 to 4, wherein in S3, the process is performed by vacuumizing for 30-40 min to-0.085-0.095 MPa, maintaining for 30-60 min, then decompressing to normal pressure, vacuumizing for 30-40 min to-0.085-0.095 MPa, and maintaining for 30-60 min.
6. The recycled aggregate concrete processing process according to any one of claims 1 to 5, wherein the incorporation amount of the polyvinyl alcohol fibers in each cubic concrete mortar is 0.9 to 1.2kg/m3。
7. The recycled aggregate concrete processing process of any one of claims 1 to 6, wherein in S4 and S5, the mass percentage of the polyvinyl alcohol fibers is 15 to 25: 75-85.
8. The recycled aggregate concrete processing process of any one of claims 1 to 7, wherein in S4, the mass-to-volume ratio of the reinforced recycled aggregate I to the cement mortar is kg/m3Is 1.5X 104～2.0×104: 1; the water cement ratio of the cement mortar is 0.8: 1.
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| CN202110755101.XA CN113354350B (en) | 2021-07-02 | 2021-07-02 | Processing technology of recycled aggregate concrete |
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| CN202110755101.XA CN113354350B (en) | 2021-07-02 | 2021-07-02 | Processing technology of recycled aggregate concrete |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114956739A (en) * | 2022-06-24 | 2022-08-30 | 陕西百固建材有限公司 | Recycled fine aggregate concrete and preparation method thereof |
| CN115745484A (en) * | 2022-11-11 | 2023-03-07 | 杭州汉特建材有限公司 | Preparation process of anti-freezing recycled concrete |
| CN116969706A (en) * | 2023-08-10 | 2023-10-31 | 中建西部建设贵州有限公司 | Preparation method of coconut shell bionic type reinforced recycled coarse aggregate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114956739A (en) * | 2022-06-24 | 2022-08-30 | 陕西百固建材有限公司 | Recycled fine aggregate concrete and preparation method thereof |
| CN115745484A (en) * | 2022-11-11 | 2023-03-07 | 杭州汉特建材有限公司 | Preparation process of anti-freezing recycled concrete |
| CN115745484B (en) * | 2022-11-11 | 2023-12-01 | 杭州汉特建材有限公司 | Preparation process of anti-freezing recycled concrete |
| CN116969706A (en) * | 2023-08-10 | 2023-10-31 | 中建西部建设贵州有限公司 | Preparation method of coconut shell bionic type reinforced recycled coarse aggregate |
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