CN111908817A - Preparation method of magnesium phosphate cement material modified recycled coarse aggregate, modified recycled coarse aggregate obtained by preparation method and application of modified recycled coarse aggregate - Google Patents
Preparation method of magnesium phosphate cement material modified recycled coarse aggregate, modified recycled coarse aggregate obtained by preparation method and application of modified recycled coarse aggregate Download PDFInfo
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- CN111908817A CN111908817A CN202010664100.XA CN202010664100A CN111908817A CN 111908817 A CN111908817 A CN 111908817A CN 202010664100 A CN202010664100 A CN 202010664100A CN 111908817 A CN111908817 A CN 111908817A
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- China
- Prior art keywords
- coarse aggregate
- recycled coarse
- magnesium phosphate
- phosphate cement
- modified 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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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
-
- 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
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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
- C04B28/34—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 cold phosphate binders
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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 invention relates to the technical field of building materials, in particular to a preparation method of magnesium phosphate cement modified recycled coarse aggregate, the obtained modified recycled coarse aggregate and application thereof. The method comprises the following steps: 1) crushing and screening the waste concrete to obtain recycled coarse aggregate with the particle size of 5-25 mm; 2) soaking the obtained regenerated coarse aggregate in water until the water is saturated, and filtering to obtain the soaked regenerated coarse aggregate; 3) and mixing the obtained soaked recycled coarse aggregate with dry powder of magnesium phosphate cement, stirring until particles of the recycled coarse aggregate are uniformly coated with the dry powder of the magnesium phosphate cement, and filtering to obtain the magnesium phosphate cement material modified recycled coarse aggregate. The invention can not only form dragging on the two sides of the interface of the recycled coarse aggregate and the new mortar and form mechanical anchoring force on the interface, thereby obviously improving the interface strength and achieving the aim of improving the integral strength of recycled concrete, but also simplify the process of the modified treatment of the recycled aggregate and achieve the aim of improving the production efficiency.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of magnesium phosphate cement modified recycled coarse aggregate, the obtained modified recycled coarse aggregate and application thereof.
Background
With the rapid development of construction industry, construction waste generated from construction industry has increased unprecedentedly, and in addition to the fact that the cost for disposing a huge amount of construction waste is quite remarkable, environmental problems and social public hazards caused thereby are also great. The management of the construction waste in China starts at the end of the 80 th 20 th century, the existing management system, policy, law and regulation are not sound enough, and most of the construction waste concrete is transported to the suburbs or the villages without any treatment due to the imperfect matching management policy and is treated in an open-air stacking or simple landfill mode. Meanwhile, the problems of scattering, dust and sand flying and the like in the clearing and stacking processes cause serious environmental pollution. Facing to the increasingly severe environmental problems, increasingly tense land supply, increasingly exhausted mineral resources and the generation of waste concrete, the contradiction among people, environment and resources is undoubtedly aggravated, and the coordinated development of the urban ecological environment is influenced.
Recycling large quantities of waste concrete, i.e. recycled concrete technology, is generally considered to be the most effective measure for solving the problem of waste concrete. The waste concrete is crushed and screened to form the recycled coarse aggregate, and the recycled coarse aggregate has the defects of high water absorption, more microcracks and the like, so that the recycled coarse aggregate needs to be subjected to modification pretreatment to be applied to the production of the recycled concrete.
Disclosure of Invention
The invention aims to further optimize a method for modifying recycled coarse aggregate, and provides a method for preparing the recycled coarse aggregate by modifying, so that the adhesive strength of a modified material and an old mortar interface can be enhanced while repairing mortar attached to the recycled coarse aggregate, and the performance of the recycled coarse aggregate is further improved. On one hand, the threat of the waste concrete to the ecological environment is relieved, and the waste concrete is popularized and applied as a green building material; on the other hand, the recycled coarse aggregate is fully utilized, the environment is further protected, and green production is realized.
The technical scheme provided by the invention is as follows:
a preparation method of magnesium phosphate cement material modified recycled coarse aggregate comprises the following steps:
1) crushing and screening the waste concrete to obtain recycled coarse aggregate with the particle size of 5-25 mm;
2) soaking the regenerated coarse aggregate obtained in the step 1) in water until water is saturated, and filtering to obtain soaked regenerated coarse aggregate;
3) mixing the soaked recycled coarse aggregate obtained in the step 2) with dry powder of magnesium phosphate cement, stirring until particles of the recycled coarse aggregate are uniformly coated with the dry powder of the magnesium phosphate cement, and filtering to obtain the magnesium phosphate cement material modified recycled coarse aggregate.
Magnesium phosphate cement, also called MPC for short, mainly contains dead burned magnesium oxide and ammonium dihydrogen phosphate, and is additionally doped with borax as retarder.
For recycling of the recycled coarse aggregate, if the recycled coarse aggregate is not treated and is directly mixed with the fresh mortar, the performance of the obtained composite mortar cannot meet the use requirement due to the interface problem of the two materials.
In the existing method, common portland cement is adopted for modification. The ordinary portland cement is adopted for modification, so that the effect of repairing cracks and holes in the recycled coarse aggregate is mainly achieved. Although the treatment can improve the compatibility of the recycled coarse aggregate and the fresh mortar and improve the performance of the fresh mortar doped with the recycled coarse aggregate to a certain extent, the mechanical property of the recycled concrete still rarely reaches the design strength of the original waste concrete because more bonding action is still basically absent between the recycled coarse aggregate and the fresh mortar.
Based on the technical scheme, after the recycled coarse aggregate is fully soaked in water, the MPC can quickly permeate into the old mortar of the recycled coarse aggregate for hydration reaction, and the repair of the recycled coarse aggregate is completed. And MPC components which are not reacted completely can continue to react towards the new mortar side in the water environment of the newly mixed concrete, and finally, the regenerated coarse aggregate and the new mortar interface are dragged at two sides to form mechanical anchoring, so that the interface strength is obviously improved.
Specifically, the soaking time of the recycled coarse aggregate in the step 2) in water is not less than 24 h.
Specifically, the weight of the soaked recycled coarse aggregate obtained in the step 2) is increased by 4-13% compared with the recycled coarse aggregate obtained in the step 1).
Specifically, in the step 3), the weight percentage of the usage amount of the dry powder of the magnesium phosphate cement and the weight gain of the regenerated coarse aggregate obtained after soaking in the step 2) is 50-70%.
Specifically, in the step 3), the weight ratio of magnesium to phosphorus in the magnesium phosphate cement is (1.8-2.2): 1.
specifically, in the step 3), the weight percentage of the soaked recycled coarse aggregate obtained in the step 2) and the magnesium phosphate cement is as follows: (92-98): (2.5-6).
The invention also provides the magnesium phosphate cement material modified recycled coarse aggregate obtained by the preparation method of the magnesium phosphate cement material modified recycled coarse aggregate.
The invention also provides application of the magnesium phosphate cement material modified recycled coarse aggregate as concrete aggregate.
The magnesium phosphate cement material modified recycled coarse aggregate provided by the invention comprises the following components: the apparent density is improved by 0.4 to 0.8 percent; the stacking density is improved by 1.5 to 1.8 percent; the water absorption is improved by 60 to 75 percent; the crushing index is improved by 20 to 25 percent; the slump or the workability of the concrete is improved by 20 to 24 percent, and the concrete is fully suitable to be used as concrete aggregate.
Compared with the prior art, the invention has the beneficial effects that:
the MPC is adopted to modify the recycled coarse aggregate, and 1) the MPC can rapidly generate a reaction after contacting water absorbed by the recycled coarse aggregate, gradually extend to the recycled coarse aggregate, and fill micro cracks in mortar attached to the recycled coarse aggregate; 2) as the MPC dry powder and the soaked recycled coarse aggregate are adopted, the interface thickness between the MPC and the adhering mortar is obviously reduced compared with the prior art. Thereby the strength of the recycled coarse aggregate is obviously improved. Compared with the traditional cement slurry modification method, the method has the advantages of simple process, convenient operation and high controllability.
Drawings
FIG. 1 is a flow chart of the preparation method of the magnesium phosphate cement material modified recycled coarse aggregate provided by the invention.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The invention provides a preparation method of magnesium phosphate cement material modified recycled coarse aggregate, which comprises the following steps:
1) crushing and screening the waste concrete by a jaw crusher to obtain recycled coarse aggregate with the particle size of 5-25 mm;
2) putting the recycled coarse aggregate obtained in the step 1) into water, soaking for 24 hours, filtering, and taking 4Kg of the recycled coarse aggregate to measure the water absorption;
3) pouring the recycled coarse aggregate soaked in the step 2) into a container containing magnesium and phosphorus with a ratio of 2: 1 and stirring to ensure that the aggregates are uniformly coated with the MPC powder, and filtering to obtain the MPC modified recycled coarse aggregates.
The waste concrete in the step 1) needs to be primarily crushed into small concrete blocks and obvious impurities are removed, and then the small concrete blocks can be placed into a jaw crusher to be crushed and screened to obtain the recycled coarse aggregate.
And when the recycled coarse aggregate is soaked in the step 2), the water surface is at least 5mm higher than the recycled coarse aggregate.
The modified material adopted in the step 3) is MPC (magnesium phosphate cement-based material), the MPC mainly comprises dead-burned magnesium oxide and ammonium dihydrogen phosphate, and borax is additionally added as a retarder, wherein the magnesium-phosphorus ratio is 2: 1, MPC is powder, and the total dosage of MPC is 3/5 of the water absorption capacity of the recycled coarse aggregate.
The present invention is further illustrated by the following specific examples, which should be construed as being without limitation to the scope of the invention.
Example 1
1) Crushing and screening the waste concrete by a jaw crusher to obtain recycled coarse aggregate with the particle size of 5-25 mm;
2) putting the recycled coarse aggregate obtained in the step 1) into water, soaking for 24 hours, and filtering, wherein 4Kg of the recycled coarse aggregate is taken to measure the water absorption (the water absorption of the recycled coarse aggregate is 7.3 percent measured in the embodiment);
3) pouring the recycled coarse aggregate soaked in the step 2) into a container containing magnesium and phosphorus with a ratio of 2: 1 (the weight percentage of each component in the container is 95.8 percent of the recycled coarse aggregate and 4.2 percent of MPC), stirring to ensure that the aggregates are uniformly coated with MPC powder, and filtering to obtain the MPC modified recycled coarse aggregate.
Example 2
1) Crushing and screening the waste concrete by a jaw crusher to obtain recycled coarse aggregate with the particle size of 5-25 mm;
2) putting the recycled coarse aggregate obtained in the step 1) into water, soaking for 24 hours, and filtering, wherein 4Kg of the recycled coarse aggregate is taken to measure the water absorption (the water absorption of the recycled coarse aggregate is 12.6 percent measured in the embodiment);
3) pouring the recycled coarse aggregate soaked in the step 2) into a container containing magnesium and phosphorus with a ratio of 2: 1 (the weight percentage of each component in the container is 93.0 percent of the recycled coarse aggregate and 7.0 percent of MPC), stirring to ensure that the aggregates are uniformly coated with MPC powder, and filtering to obtain the MPC modified recycled coarse aggregate.
Example 3
1) Crushing and screening the waste concrete by a jaw crusher to obtain recycled coarse aggregate with the particle size of 5-25 mm;
2) putting the recycled coarse aggregate obtained in the step 1) into water, soaking for 24 hours, and filtering, wherein 4Kg of the recycled coarse aggregate is taken to measure the water absorption (the water absorption of the recycled coarse aggregate is 4.9 percent measured in the embodiment);
3) pouring the recycled coarse aggregate soaked in the step 2) into a container containing magnesium and phosphorus with a ratio of 2: 1 (the weight percentage of each component in the container is 97.1 percent of the recycled coarse aggregate and 2.9 percent of MPC), stirring to ensure that the aggregates are uniformly coated with MPC powder, and filtering to obtain the MPC modified recycled coarse aggregate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The preparation method of the magnesium phosphate cement material modified recycled coarse aggregate is characterized by comprising the following steps:
1) crushing and screening the waste concrete to obtain recycled coarse aggregate with the particle size of 5-25 mm;
2) soaking the regenerated coarse aggregate obtained in the step 1) in water until water is saturated, and filtering to obtain soaked regenerated coarse aggregate;
3) mixing the soaked recycled coarse aggregate obtained in the step 2) with dry powder of magnesium phosphate cement, stirring until particles of the recycled coarse aggregate are uniformly coated with the dry powder of the magnesium phosphate cement, and filtering to obtain the magnesium phosphate cement material modified recycled coarse aggregate.
2. The method for preparing the magnesium phosphate cement material modified recycled coarse aggregate according to claim 1, which is characterized in that: the soaking time of the recycled coarse aggregate in the step 2) in water is not less than 24 h.
3. The method for preparing the magnesium phosphate cement material modified recycled coarse aggregate according to claim 2, which is characterized in that: the weight of the soaked recycled coarse aggregate obtained in the step 2) is increased by 4-13% compared with the recycled coarse aggregate obtained in the step 1).
4. The method for preparing the magnesium phosphate cement material modified recycled coarse aggregate according to claim 3, which is characterized in that: in the step 3), the weight percentage of the usage amount of the dry powder of the magnesium phosphate cement and the weight gain of the regenerated coarse aggregate obtained after soaking in the step 2) is 50-70%.
5. The method for preparing the magnesium phosphate cement material modified recycled coarse aggregate according to claim 4, which is characterized in that: in the step 3), the weight percentage of the soaked recycled coarse aggregate obtained in the step 2) and the dry powder of the magnesium phosphate cement is as follows: (92-98): (2.5-6).
6. The method for preparing the magnesium phosphate cement material modified recycled coarse aggregate according to any one of claims 1 to 5, wherein: in the step 3), the weight ratio of magnesium to phosphorus in the magnesium phosphate cement is (1.8-2.2): 1.
7. a magnesium phosphate cement material-modified recycled coarse aggregate obtained by the method for preparing a magnesium phosphate cement material-modified recycled coarse aggregate according to any one of claims 1 to 6.
8. The use of the magnesium phosphate cement material modified recycled coarse aggregate according to claim 7, wherein: as concrete aggregate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664100.XA CN111908817A (en) | 2020-07-10 | 2020-07-10 | Preparation method of magnesium phosphate cement material modified recycled coarse aggregate, modified recycled coarse aggregate obtained by preparation method and application of modified recycled coarse aggregate |
| NL2028676A NL2028676B1 (en) | 2020-07-10 | 2021-07-09 | Preparation method of magnesium phosphate cement (MPC) modified recycled coarse aggregates (RCA), obtained modified RCA and application of MPC modified RCA |
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| CN202010664100.XA CN111908817A (en) | 2020-07-10 | 2020-07-10 | Preparation method of magnesium phosphate cement material modified recycled coarse aggregate, modified recycled coarse aggregate obtained by preparation method and application of modified recycled coarse aggregate |
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| CN111908817A true CN111908817A (en) | 2020-11-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113800813A (en) * | 2021-10-12 | 2021-12-17 | 江西秀川科技有限公司 | Recycled aggregate reinforced slurry and preparation method thereof |
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2020
- 2020-07-10 CN CN202010664100.XA patent/CN111908817A/en active Pending
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2021
- 2021-07-09 NL NL2028676A patent/NL2028676B1/en active
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| JP2006182591A (en) * | 2004-12-27 | 2006-07-13 | Kao Corp | Regenerated aggregate modifying material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113800813A (en) * | 2021-10-12 | 2021-12-17 | 江西秀川科技有限公司 | Recycled aggregate reinforced slurry and preparation method thereof |
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| NL2028676A (en) | 2022-02-28 |
| NL2028676B1 (en) | 2022-04-29 |
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Application publication date: 20201110 |