CN110498629B - Application of ECC material in recycled aggregate reinforcement, recycled reinforced aggregate and preparation method and application thereof - Google Patents
Application of ECC material in recycled aggregate reinforcement, recycled reinforced aggregate and preparation method and application thereof Download PDFInfo
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- CN110498629B CN110498629B CN201910851442.XA CN201910851442A CN110498629B CN 110498629 B CN110498629 B CN 110498629B CN 201910851442 A CN201910851442 A CN 201910851442A CN 110498629 B CN110498629 B CN 110498629B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
-
- 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
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
-
- 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 belongs to the technical field of building materials, and particularly relates to application of an ECC material in recycled aggregate reinforcement, a recycled reinforced aggregate, and a preparation method and application thereof. The invention provides an application of an ECC material in recycled aggregate reinforcement, the ECC material has the characteristics of good strain hardening characteristic after hardening and multi-seam cracking under the stretching action, and the quality of the recycled aggregate can be obviously improved; the invention also provides a recycled reinforced aggregate, which comprises a recycled aggregate and an ECC layer wrapped on the surface of the recycled aggregate, wherein the ECC layer is used for filling the pores of the recycled aggregate and wrapping the surface of the recycled aggregate, so that the purposes of compacting an interface transition area and enhancing the mechanical property of the recycled aggregate are achieved; the method can also increase the ductility of concrete and improve the energy consumption level of the concrete structure under static and dynamic loads. Tests show that the 28d crushing index of the recycled reinforced aggregate provided by the invention is 12.21%, and the 28d compressive strength reaches 49 MPa.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to application of an ECC material in recycled aggregate reinforcement, a recycled reinforced aggregate, and a preparation method and application thereof.
Background
In order to solve the problems of recycling of a large amount of construction waste and waste of construction resources such as gravel and the like, a large amount of waste concrete in the construction waste is crushed and processed into recycled aggregate, and new concrete prepared by partially or completely replacing natural aggregate is called recycled concrete. The recycled aggregate obtained by simply crushing the waste concrete has more edges and corners and rough surface, and the components contain the original hardened mortar, so the performance of the recycled aggregate is obviously inferior to that of natural aggregate, and the recycled aggregate is usually used for preparing low-grade concrete. In order to make the construction industry go to a sustainable road, reinforcement treatment is required to improve the quality of the concrete recycled aggregate so as to improve the use value of the recycled concrete.
At present, two common concrete recycled aggregate strengthening methods are available, namely a chemical strengthening method and a physical strengthening method. The chemical strengthening method uses chemical slurry to carry out treatments such as dipping, leaching and drying on the recycled aggregate, and directly or indirectly fills the pores of the recycled aggregate, but the method can only repair the surface of the recycled aggregate, has high chemical solution cost, is easy to cause secondary pollution, and has great limitation in the aspects of economy and practicability. The physical strengthening method uses mechanical equipment to further treat the recycled aggregate, and removes cement mortar and particle edges and corners adhered to the surface through mechanical actions such as mutual impact and grinding among the aggregates, however, the physical strengthening method uses more mechanical energy consumption, further damages the recycled aggregate and reduces the contribution of the recycled aggregate to the mechanical property of the concrete.
Disclosure of Invention
In view of the above, the present invention aims to provide an application of an ECC material in recycled aggregate reinforcement, wherein the ECC material has the characteristics of good strain hardening characteristics after hardening, and can generate a plurality of fine cracks under the action of tensile load, and can significantly improve the quality of recycled aggregate; the invention also provides a recycled reinforced aggregate which has higher compressive strength, the crushing index of the recycled reinforced aggregate is close to that of a natural aggregate, and the quality is excellent; the invention also provides a preparation method which is simple and feasible and is suitable for industrial production.
In order to achieve the purpose of the invention, the invention provides the following technical scheme:
the invention provides an application of an ECC material in recycled aggregate reinforcement.
Preferably, the ECC material is prepared from the following preparation raw materials in parts by mass:
preferably, the preparation method of the ECC material includes the following steps:
mixing cement and fly ash to obtain a first mixture;
carrying out first stirring on the first mixture, the water reducing agent and water to obtain a second mixture;
carrying out second stirring on the second mixture and PE fibers to obtain ECC;
the first stirring time is 4-5 min; and the second stirring time is 1-2 min.
The invention also provides a recycled reinforced aggregate, which comprises a recycled aggregate and an ECC layer wrapped on the surface of the recycled aggregate.
Preferably, the particle size of the recycled aggregate is 5-20 mm.
Preferably, the thickness of the ECC layer is 0.1-1.2 mm.
The invention also provides a preparation method of the recycled reinforced aggregate in the technical scheme, which comprises the following steps:
and stirring the recycled aggregate, the ECC material and the accelerator solution to obtain the recycled reinforced aggregate.
Preferably, the mass ratio of the quick-setting agent to water in the quick-setting agent solution is (3-4): (28-38); the mass ratio of the recycled aggregate, the ECC medium cement and the accelerator solution accelerator is 1000: (113-152): (3-4).
Preferably, the solute in the accelerator solution is aluminum sulfate.
The invention also provides application of the recycled reinforced aggregate in concrete, mortar and recycled bricks.
The ECC material has good and obvious strain hardening characteristics after being hardened, can generate a plurality of fine cracks under the action of tensile load, can stably reach the ultimate tensile strain of more than 3 percent, has the characteristics of good strain hardening characteristics after being hardened and can generate a plurality of fine cracks under the action of tensile load, and can obviously improve the quality of recycled aggregate.
The invention provides a recycled reinforced aggregate which comprises a recycled aggregate and an ECC layer wrapped on the surface of the recycled aggregate. The recycled aggregate has mechanical properties and durability which are reduced compared with natural aggregate due to the existence of various new and old interface transition areas in the recycled aggregate.
Experimental data show that the 28d crushing index of the recycled reinforced aggregate provided by the invention is only 12.21%, and the 7d compressive strength, the 14d compressive strength and the 28d compressive strength of the recycled concrete prepared from the recycled reinforced aggregate provided by the invention reach 37.62MPa, 43.88MPa and 49.00MPa respectively.
Detailed Description
The invention provides an application of an ECC material in recycled aggregate reinforcement.
In the invention, the particle size of the recycled aggregate is preferably 5-20 mm, more preferably 8-17 mm, and still more preferably 10-15 mm. The source of the recycled aggregate is not specially limited, and the recycled aggregate can be prepared from the conventional concrete recycled aggregate.
In the invention, the ECC material is preferably prepared from the following raw materials in parts by mass:
in the present invention, all the starting materials for the preparation are commercially available products known to those skilled in the art unless otherwise specified.
The ECC material provided by the invention comprises, by mass, preferably 113-152 parts of cement, more preferably 113-145 parts of cement, and even more preferably 113-140 parts of cement. In the present invention, the cement is preferably portland cement. In the invention, the grade number of the cement is preferably 42.5-52.5. The embodiment of the invention preferably uses the conch brand Portland cement P. O42.5R.
The ECC is prepared from the raw materials preferably including 38-52 parts of fly ash, more preferably 38-46 parts of fly ash, and even more preferably 38-42 parts of fly ash based on the mass parts of the cement. In the present invention, the fly ash is preferably a class I fly ash. In the invention, the fineness of the fly ash is preferably 0.045mm square-hole sieve residue which is less than or equal to 12%. The embodiment of the invention preferably uses the microsystems VCEM fly ash V1500-I. The fly ash disclosed by the invention can improve the workability of ECC, inhibit ECC bleeding, reduce the hydration heat of ECC and be beneficial to improving the later strength and durability of ECC.
The preparation raw material of the ECC material preferably comprises 1.4-1.9 parts of PE fiber, more preferably 1.45-1.85 parts, and even more preferably 1.5-1.8 parts by mass of the cement. In the invention, the length of the PE fiber is preferably 6-20 mm, more preferably 10-16 mm, and further preferably 12-14 mm; the diameter is preferably 10 to 38 μm, more preferably 15 to 33 μm, and further preferably 20 to 30 μm. The PE fiber is hydrophobic, the surface of the PE fiber has no chemical bonding stress with other components of the ECC material, the bonding slip relation with the matrix is more stable along with the extension of the age, the surface of the PE fiber does not need to be coated with oil, so the durability of the ECC material can be effectively improved, and in addition, the PE fiber can effectively toughen the matrix strength of the cement paste.
The ECC material preferably comprises 3.5-4.7 parts of a water reducing agent, more preferably 3.8-4.3 parts of the water reducing agent, and even more preferably 3.9-4.1 parts of the water reducing agent. The water reducing agent is not particularly limited in the present invention, and a water reducing agent known to those skilled in the art may be used, and in the examples of the present invention, specifically, lithium carbonate is used.
The preparation raw material of the ECC material preferably comprises 30-41 parts of water, more preferably 32-39 parts of water, and even more preferably 34-37 parts of water based on the mass parts of the cement.
In the present invention, the preparation method of the ECC material preferably includes the following steps:
mixing cement and fly ash to obtain a first mixture;
carrying out first stirring on the first mixture, the water reducing agent and water to obtain a second mixture;
carrying out second stirring on the second mixture and PE fibers to obtain an ECC material;
the first stirring time is 4-5 min; and the second stirring time is 1-2 min.
The stirring rate of the first stirring and the second stirring is not particularly limited in the present invention, and a stirring rate known to those skilled in the art may be used. The invention ensures the PE fiber in the ECC material to be well dispersed by mixing in steps.
The invention also provides a recycled reinforced aggregate, which comprises a recycled aggregate and an ECC layer wrapped on the surface of the recycled aggregate.
In the invention, the particle size of the recycled aggregate is preferably 5-20 mm, more preferably 8-17 mm, and still more preferably 10-15 mm. The source of the recycled aggregate is not specially limited, and the recycled aggregate can be prepared from the conventional concrete recycled aggregate. In the invention, the thickness of the ECC layer is preferably 0.1-1.2 mm, more preferably 0.3-1.0 mm, and still more preferably 0.5-0.8 mm.
The invention also provides a preparation method of the recycled reinforced aggregate in the technical scheme, which comprises the following steps:
and stirring the recycled aggregate, the ECC material and the accelerator solution to obtain the recycled reinforced aggregate.
In the invention, the mass ratio of the quick-setting agent to water in the quick-setting agent solution is preferably (3-4): (28-38). In the invention, the mass ratio of the recycled aggregate, the cement in the ECC and the quick-setting agent in the quick-setting agent solution is preferably 1000: (113-152): (3-4). In the invention, the stirring time is preferably 4-5 min, and more preferably 4.2-4.8 min; the stirring rate is not particularly limited in the present invention, and a stirring rate known to those skilled in the art may be used.
In the present invention, the solute in the accelerator solution is preferably aluminum sulfate. In the invention, the accelerator is beneficial to quickly coagulating ECC on the surface of the recycled aggregate.
According to the invention, the recycled aggregate and the ECC material are preferably mixed, and then the accelerator solution is added within 1min to obtain a mixed system; the mixing mode is preferably stirring, and the stirring speed is not particularly limited in the invention;
after the mixed system is obtained, the mixed system is preferably stirred; the time of the stirring treatment is preferably 1-2 min, and the stirring rate of the stirring treatment is not particularly limited in the invention, and can be a stirring rate well known to those skilled in the art.
The invention also provides application of the recycled reinforced aggregate in concrete, mortar and recycled bricks.
In order to further illustrate the present invention, the recycled reinforced aggregate and the preparation method thereof provided by the present invention will be described in detail with reference to examples, but they should not be construed as limiting the scope of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the 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.
Example 1
0.795kg of cement and 0.265kg of fly ash are mixed to obtain a first mixture, the first mixture, 25g of water reducing agent and 212g of water are mixed and stirred for 4.5min to obtain a second mixture, and the second mixture and 10g of PE fibers are mixed and stirred for 1.5min to obtain the ECC material. Mixing 21.2g of aluminum sulfate with 201g of water to obtain an aluminum sulfate aqueous solution; the obtained ECC material, 222.2g of aluminum sulfate aqueous solution and 7kg of waste concrete are mixed and stirred for 1.5min to obtain the recycled reinforced aggregate.
Comparative example 1
Recycled aggregate used in example 1.
Comparative example 2
Commercially available natural aggregates.
Aggregate crushing indexes of the aggregate in the test example 1 and the aggregate in the comparative examples 1-2 are tested according to JGJ 52-2006 Standard for quality and inspection method of common concrete, and the detection results are shown in Table 1.
Table 1 example 1 and comparative examples 1 to 2 aggregate crushing index test results (%)
As can be seen from the table 1, the crushing index of the recycled reinforced aggregate provided by the invention after being maintained for 28 days is only 12.21%, compared with the common commercial recycled aggregate (comparative example 1), the crushing index is improved by 37.4%, the recycled reinforced aggregate is closer to the crushing index of natural aggregate, and the practicability is improved. As can be seen from the crushing indexes of the recycled reinforced aggregate obtained in example 1 in Table 1 in different curing times, the crushing index of the recycled reinforced aggregate obtained in example 1 is reduced along with the increase of curing days, which indicates that the ECC material on the surface of the recycled reinforced aggregate is continuously hydrated and is more tightly combined with the aggregate, and this also laterally indicates that the recycled reinforced aggregate has the advantage of continuously reinforcing the transition zone of the concrete interface.
The recycled reinforced aggregate of the example 1 and the recycled aggregate of the comparative example 1 are used as concrete aggregates, and recycled concrete is obtained under the same concrete mixing ratio; the recycled concrete comprises the following materials in percentage by mass:
1 part of the recycled reinforced aggregate of example 1 or the recycled aggregate of comparative example 1;
0.256 part of water;
0.503 part of cement;
and 0.539 parts of river sand.
The cubic compressive strength of the recycled concrete is tested according to GB/T50081-2002 Standard test method for mechanical properties of ordinary concrete, and the test results are shown in Table 2.
Table 2 mechanical property test results of recycled concrete obtained in example 1 and comparative example 1
| Example 1 | Comparative example 1 | |
| Curing time/d | Compressive strength/MPa | Compressive strength/MPa |
| 7 | 39.92 | 29.90 |
| 14 | 43.88 | 33.41 |
| 28 | 49.00 | 37.85 |
As can be seen from Table 2, the concrete prepared by the recycled reinforced aggregate provided by the invention has the compressive strength of 39.92MPa after 7d curing, 43.88MPa after 14d curing and 49.00MPa after 28d curing, and compared with the common recycled aggregate sold in the market (comparative example 1), the mechanical property is obviously improved.
The ECC material provided by the invention has the characteristics of good strain hardening characteristic after hardening and capability of generating a plurality of fine cracks under the action of tensile load; the provided recycled reinforced aggregate utilizes the ECC layer to fill gaps of the recycled aggregate and wrap the surface of the recycled aggregate, so that the purposes of compacting an interface transition area and enhancing the mechanical property of the recycled aggregate are achieved, the recycled reinforced aggregate with remarkably improved mechanical property and durability is obtained, the economy and the practicability are improved, and the recycled aggregate is prevented from being further damaged in the processing process; the preparation method of the recycled reinforced aggregate provided by the invention is simple in process and suitable for industrial popularization.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The application of an ECC material in recycled aggregate reinforcement;
the ECC material is prepared from the following preparation raw materials in parts by mass:
2. the use according to claim 1, wherein the ECC material is prepared by a method comprising the steps of:
mixing cement and fly ash to obtain a first mixture;
carrying out first stirring on the first mixture, the water reducing agent and water to obtain a second mixture;
carrying out second stirring on the second mixture and PE fibers to obtain ECC;
the first stirring time is 4-5 min; and the second stirring time is 1-2 min.
3. The recycled reinforced aggregate comprises recycled aggregate and an ECC layer wrapped on the surface of the recycled aggregate; the ECC layer is formed by the ECC material of claim 1 or 2.
4. The recycled reinforced aggregate of claim 3, wherein the recycled aggregate has a particle size of 5 to 20 mm.
5. The recycled reinforcement aggregate of claim 3, wherein the ECC layer has a thickness of 0.1-1.2 mm.
6. The method for preparing a recycled reinforced aggregate according to any one of claims 3 to 5, comprising the steps of:
and stirring the recycled aggregate, the ECC material and the accelerator solution to obtain the recycled reinforced aggregate.
7. The preparation method of the concrete admixture as claimed in claim 6, wherein the mass ratio of the quick-setting agent in the quick-setting agent solution to water is (3-4): (28-38); the mass ratio of the recycled aggregate, the ECC medium cement and the accelerator solution accelerator is 1000: (113-152): (3-4).
8. The production method according to claim 6 or 7, characterized in that the solute in the accelerator solution is aluminum sulfate.
9. Use of the recycled reinforced aggregate of any one of claims 3 to 5 in concrete, mortar and recycled bricks.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910851442.XA CN110498629B (en) | 2019-09-10 | 2019-09-10 | Application of ECC material in recycled aggregate reinforcement, recycled reinforced aggregate and preparation method and application thereof |
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| CN201910851442.XA CN110498629B (en) | 2019-09-10 | 2019-09-10 | Application of ECC material in recycled aggregate reinforcement, recycled reinforced aggregate and preparation method and application thereof |
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| CN110498629A CN110498629A (en) | 2019-11-26 |
| CN110498629B true CN110498629B (en) | 2020-08-28 |
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