CN115448664A - High-strength concrete based on machine-made aggregate and preparation method thereof - Google Patents
High-strength concrete based on machine-made aggregate and preparation method thereof Download PDFInfo
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- CN115448664A CN115448664A CN202211152619.5A CN202211152619A CN115448664A CN 115448664 A CN115448664 A CN 115448664A CN 202211152619 A CN202211152619 A CN 202211152619A CN 115448664 A CN115448664 A CN 115448664A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
-
- 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 application relates to the field of concrete, and particularly discloses high-strength concrete based on machine-made aggregate and a preparation method thereof. The concrete comprises 140-160 parts of water, 360-420 parts of cement, 400-465 parts of machine-made fine aggregate, 980-1160 parts of machine-made coarse aggregate, 20-40 parts of rubber particles, 25-35 parts of silicon carbide powder and 30-45 parts of basalt fiber, and the raw materials are mixed to prepare the concrete, wherein the 28d compressive strength is more than 43.8MPa, and the 28d tensile strength is more than 23.8MPa. The preparation method of the concrete comprises the following steps: respectively bonding rubber particles and silicon carbide powder on basalt fibers, and mixing with machine-made coarse aggregate, machine-made fine aggregate, cement and the like to prepare concrete, wherein the 28d compressive strength of the concrete is improved from 35.5MPa to over 45.4 MPa; the 28d tensile strength is improved from 14.5MPa to more than 24.4 MPa.
Description
Technical Field
The application relates to the field of concrete, in particular to high-strength concrete based on machine-made aggregate and a preparation method thereof.
Background
Concrete is one of the largest quantities of construction materials used today, and is often used for building houses, constructing bridges, paving roads, etc. The concrete mainly comprises water, cement, aggregates and the like, the aggregates are bonded under the action of the cement and the water, and the cured concrete has certain strength. The aggregate is generally natural aggregate, and the natural aggregate is from nature and is often used as a manufacturing material of concrete.
With the continuous development of society and the rapid increase of the number of buildings, the demand of concrete is increasing, and the consumption of aggregate and water is also increasing, thereby causing the shortage of natural sand and the shortage of water resources.
In related researches, the mechanical aggregate is used for gradually replacing the natural aggregate to manufacture the concrete so as to save the using amount of the natural aggregate. However, the strength of concrete made of machine-made aggregate is reduced to different degrees, and the 28d compressive strength and the 28d tensile strength of concrete are about 35.5MPa and 14.5MPa respectively. In recent years, the construction field puts higher requirements on the strength of concrete, and the concrete needs to meet the use requirements under different working conditions.
Disclosure of Invention
In order to improve the strength of concrete, the application provides high-strength concrete based on machine-made aggregate and a preparation method thereof.
In a first aspect, the application provides high-strength concrete based on machine-made aggregate, which comprises, by weight, 140-160 parts of water, 360-420 parts of cement, 400-465 parts of machine-made fine aggregate, 980-1160 parts of machine-made coarse aggregate, 20-40 parts of rubber particles, 25-35 parts of silicon carbide powder and 30-45 parts of basalt fiber.
In the application, the machine-made sand is used as aggregate, the rubber particles, the silicon carbide powder, the basalt fiber and the cement are added, water is added and mixed to prepare the concrete, and under the action of the rubber particles, the silicon carbide powder and the basalt fiber, the 28d compressive strength of the concrete is more than 45.4MPa, and the 28d tensile strength of the concrete is more than 24.4 MPa. Compared with the existing concrete, the concrete prepared by the application has the advantages that the 28d compressive strength is improved to more than 45.4MPa from 35.5MPa, and is improved by more than 27.88%; the 28d tensile strength is improved from 14.5MPa to more than 24.4MPa by more than 68.28 percent.
In one embodiment, the high-strength concrete comprises, by weight, 140-150 parts of water, 360-390 parts of cement, 400-465 parts of machine-made fine aggregate, 980-1160 parts of machine-made coarse aggregate, 30-40 parts of rubber particles, 30-35 parts of silicon carbide powder and 40-45 parts of basalt fibers.
Preferably, the high-strength concrete comprises 140 parts of water, 360 parts of cement, 400 parts of machine-made fine aggregate, 980 parts of machine-made coarse aggregate, 30 parts of rubber particles, 30 parts of silicon carbide powder and 40 parts of basalt fiber.
By adopting the technical scheme, cement, machine-made fine aggregate, machine-made coarse aggregate, rubber particles, silicon carbide powder and basalt fiber are mixed, and then water is added for mixing to prepare the concrete. The concrete had a 28d compressive strength of 43.8MPa and a 28d tensile strength of 23.8MPa.
In one embodiment, the machined coarse aggregate has an average particle size of 10 to 40mm.
In the present application, the mean particle size of the machined coarse aggregate may be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm or 40mm.
Preferably, the average particle size of the machine-made coarse aggregate is 20-40mm.
More preferably, the machined coarse aggregate has an average particle size of 20mm.
In one embodiment, the mechanically fine aggregate has a fineness modulus of 2.0 to 2.8.
Preferably, the fineness modulus of the machine-made fine aggregate is 2.0-2.5.
More preferably, the mechanical fine aggregate has a fineness modulus of 2.5.
In the application, the machine-made fine aggregate and the machine-made coarse aggregate are prepared by crushing through a crusher, and crushed stone is separated through a multi-stage vibrating screen to prepare the machine-made fine aggregate and the machine-made coarse aggregate with different specifications. Under the gradation that the average grain diameter of the machine-made coarse aggregate is 10-40mm and the fineness modulus of the machine-made fine aggregate is 2.0-2.8, the prepared concrete has good compressive strength and tensile strength, the 28d compressive strength is more than 47.6MPa, and the 28d tensile strength is 27.2MPa.
In one embodiment, the rubber particles have a particle size of 1 to 3mm.
Preferably, the rubber particles have a particle size of 2 to 3mm.
More preferably, the rubber particles have a particle size of 2mm.
The rubber particles are added into the concrete, so that the vibration damping performance and the toughness of the concrete can be improved. However, rubber particles belong to organic materials, concrete is an inorganic material, and when the rubber particles are added to concrete, the adhesion between the rubber particles and the concrete is poor, resulting in a decrease in the strength of the concrete. The silicon carbide powder and the basalt fiber are added into the concrete, and the concrete keeps high strength under the combined action of the rubber particles, the silicon carbide powder and the basalt fiber.
In one embodiment, the silicon carbide powder has a particle size of 9.5 to 14 μm.
Preferably, the particle size of the silicon carbide powder is 11.5 to 14 μm.
More preferably, the particle size of the silicon carbide powder is 11.5 μm.
In one embodiment, the basalt fibers have a length of 20 to 40mm and a diameter of 16 to 25 μm.
Preferably, the basalt fiber has a length of 30 to 40mm and a diameter of 20 to 25 μm.
More preferably, the basalt fiber has a length of 30mm and a diameter of 20 μm.
The basalt fibers are added into the concrete, are distributed in the concrete, and are in lap joint with the machine-made fine aggregate and the machine-made coarse aggregate, so that the generation and development of void ratio and cracks in the concrete can be effectively reduced. In addition, the basalt fiber can be used as a link to bond the silicon carbide powder and the rubber particles with the machine-made fine aggregate and the machine-made coarse aggregate, so that the compressive strength and the tensile strength of the concrete are improved.
In a second aspect, the present application provides a method for preparing high-strength concrete based on a machine-made aggregate, comprising the steps of,
(1) Bonding the rubber particles on the basalt fibers to prepare an intermediate material;
(2) Bonding the silicon carbide powder on the intermediate material to prepare a prefabricated material;
(3) And mixing the prefabricated material with cement, machine-made fine aggregate and machine-made coarse aggregate according to corresponding parts, and adding water to prepare the high-strength concrete.
The application provides a preparation method of concrete, which comprises the following steps of firstly, utilizing basalt fibers as a supporting carrier, and bonding rubber particles on the basalt fibers to prepare an intermediate material; thirdly, spraying a binder on the intermediate material, and then bonding the silicon carbide powder on the surface of the intermediate material to prepare a prefabricated material; and finally, mixing the prefabricated material, the cement, the machine-made fine aggregate and the machine-made coarse aggregate, and adding water for mixing to obtain the high-strength concrete.
In one embodiment, the preparation of the preform comprises the steps of: soaking basalt fibers in a binder for 10-20min, then flatly paving rubber particles on the basalt fibers, and drying to prepare an intermediate material; and spraying a binder on the intermediate material, spraying silicon carbide powder on the intermediate material, drying to obtain a prefabricated material, and cutting the prefabricated material to obtain the prefabricated material with the length of 20-40mm.
In one embodiment, the binder is a polyacrylate emulsion.
In one embodiment, the high-strength concrete comprises 140 parts of water, 360 parts of cement, 400 parts of machine-made fine aggregate, 980 parts of machine-made coarse aggregate, 30 parts of rubber particles, 30 parts of silicon carbide powder and 40 parts of basalt fiber;
wherein the average particle size of the machine-made coarse aggregate is 20mm;
wherein the fineness modulus of the machine-made fine aggregate is 2.5;
wherein the rubber particles have a particle size of 2mm;
wherein the particle size of the silicon carbide powder is 11.5 μm;
wherein the basalt fiber has a diameter of 20 μm.
By adopting the technical scheme, the rubber particles and the silicon carbide powder are respectively bonded on the basalt fibers to prepare the prefabricated material, then the prefabricated material, the machine-made coarse aggregate, the machine-made fine aggregate and the cement are mixed, and the concrete is prepared after water is added. The 28d compressive strength of the concrete is improved from 35.5MPa to more than 48.6MPa by 36.9 percent; the 28d tensile strength is improved from 14.5MPa to more than 28.6MPa, and is improved by 97.24 percent.
In summary, the present application has the following beneficial effects:
1. the high-strength concrete comprises cement, machine-made coarse aggregate, machine-made fine aggregate, rubber particles, silicon carbide powder and basalt fibers, wherein the 28d compressive strength of the concrete is more than 43.8MPa, and the 28d tensile strength is more than 23.8 MPa;
2. according to the preparation method of the high-strength concrete, the rubber particles and the silicon carbide powder are respectively bonded on the basalt fibers to prepare a prefabricated material, and then the prefabricated material is mixed with other raw materials to prepare the concrete, wherein the 28d compressive strength of the concrete is more than 45.4MPa, and the 28d tensile strength of the concrete is more than 24.4 MPa.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
Raw materials
The starting materials mentioned in the present application are commercially available, unless otherwise specified.
Examples
Example 1
The preparation method of the high-strength concrete comprises the following steps:
(1) Driving one end of basalt fiber to move by utilizing traction force, penetrating through a container filled with a binder, wherein the time from the beginning of the contact of one end of the basalt fiber with the binder to the leaving of the one end of the basalt fiber with the binder is 10min, and bonding 30kg of rubber particles on the basalt fiber under the action of the binder to prepare an intermediate material;
wherein the weight of the basalt fiber is 40kg, the diameter is 20 μm, the elastic modulus is 81Gpa, the tensile strength is 4300MPa, and the elongation at break is 3.1%;
wherein the particle size of the rubber particles is 2mm;
wherein the binder is polyacrylate emulsion;
(2) Spraying a binder on the intermediate material, then binding 30kg of silicon carbide powder on the intermediate material, drying to prepare a prefabricated material, and shearing the prefabricated material to obtain the prefabricated material with the length of 30mm;
wherein the grain diameter of the silicon carbide powder is 11.5 mu m;
wherein the adhesive is polyacrylate emulsion, and the dosage of the adhesive is 35 percent of the weight of the silicon carbide powder;
(3) Mixing 360kg of cement, 400kg of machine-made fine aggregate, 980kg of machine-made coarse aggregate and a prefabricated material, and adding 140kg of water to prepare concrete;
wherein the cement is PO 42.5;
wherein the fineness modulus of the machine-made fine aggregate is 2.5;
wherein the average particle size of the machine-made coarse aggregate is 20mm.
The differences between examples 2 to 7 and comparative examples 1 to 10 and example 1 are shown in table 1.
TABLE 1 parameters (unit: kg) for distinguishing examples 2 to 7 and comparative examples 1 to 10 from example 1
| Group of | Rubber particles | Silicon carbide powder | Basalt fiber |
| Example 1 | 30 | 30 | 40 |
| Example 2 | 20 | 30 | 40 |
| Example 3 | 40 | 30 | 40 |
| Example 4 | 30 | 25 | 40 |
| Example 5 | 30 | 35 | 40 |
| Example 6 | 30 | 30 | 30 |
| Example 7 | 30 | 30 | 45 |
| Comparative example 1 | 0 | 30 | 40 |
| Comparative example 2 | 15 | 30 | 40 |
| Comparative example 3 | 45 | 30 | 40 |
| Comparative example 4 | 30 | 0 | 40 |
| Comparative example 5 | 30 | 20 | 40 |
| Comparative example 6 | 30 | 40 | 40 |
| Comparative example 7 | 30 | 30 | 0 |
| Comparative example 8 | 30 | 30 | 25 |
| Comparative example 9 | 30 | 30 | 50 |
| Comparative example 10 | 0 | 0 | 0 |
Example 8
Example 8 differs from example 1 in the preparation method, and example 8 is prepared by the following steps: 40kg of basalt fiber, 30kg of rubber particles, 30kg of silicon carbide powder, 360kg of cement, 400kg of machine-made fine aggregate and 980kg of machine-made coarse aggregate are added into a stirring container to be mixed, and 140kg of water is added to be stirred to prepare concrete, wherein the length of the basalt fiber is 30mm, and the diameter of the basalt fiber is 20 microns.
Performance test
The concrete prepared in the examples 1 to 8 and the concrete prepared in the comparative examples 1 to 10 are subjected to performance tests, the 28d compressive strength and the 28d tensile strength are detected according to GB/T50107-2010 concrete strength test and assessment Standard, and specific detection results are shown in Table 2.
TABLE 2 Performance test results (unit: MPa)
It can be seen from the combination of examples 1 to 8 and comparative examples 1 to 10 and table 2 that the concrete prepared by the present application can improve the strength of the concrete under the combined action of the rubber particles, the silicon carbide powder and the basalt fiber, so that the 28d compressive strength of the concrete is more than 43.8MPa, and the 28d tensile strength is more than 23.8MPa.
Combining example 1 and comparative examples 1/4/7/10 and table 2, it can be seen that the concrete 28d compressive strength was 35.5MPa and the 28d tensile strength was 14.5MPa when no rubber particles, silicon carbide powder and basalt fibers were added to the concrete; when rubber particles, silicon carbide powder and basalt fibers are added into the concrete, the 28d compressive strength of the concrete is 48.6MPa, and the 28d tensile strength of the concrete is 28.6MPa. That is, under the coordination of the rubber particles, the silicon carbide powder and the basalt fibers, the 28d compressive strength of the concrete is improved by 36.9 percent, and the 28d tensile strength is improved by 97.24 percent.
By combining examples 1 to 7 and comparative examples 2/3/5/6/8/9 with Table 2, it can be seen that when rubber particles, silicon carbide powder and basalt fiber are added to concrete and the rubber particles, silicon carbide powder and basalt fiber are used in a combination of (20-40 parts)/(25-35 parts)/(30-45 parts), the concrete has a 28d compressive strength of 45.4MPa or more and a 28d tensile strength of 24.4MPa or more.
Examples 9 to 18
The differences between examples 9-18 and example 1 are shown in Table 3.
Table 3 parameters distinguishing examples 9-18 from example 1
Performance test the concrete prepared in examples 9 to 18 was subjected to a performance test, and the 28d compressive strength and tensile strength were measured according to GB/T50107-2010 Standard for testing and evaluating concrete Strength, and the specific test results are shown in Table 4.
Table 4 results of performance tests of examples 9 to 18
As can be seen by combining examples 1 and 9-18 with Table 4, the concrete produced in examples 9-18 has a 28d compressive strength of 47.1MPa or more and a 28d tensile strength of 26.4MPa or more, without changing the weight of the raw materials.
As can be seen from the combination of examples 1 and 9 to 18 and Table 4, when the average particle size of the machine-made coarse aggregate was 20mm, the fineness modulus of the machine-made fine aggregate was 2.5, the particle size of the rubber particles was 2mm, the particle size of the silicon carbide powder was 11.5 μm, the length of the basalt fiber was 30mm, and the diameter was 20 μm, the compressive strength of the concrete 28d was 48.6MPa or more, and the tensile strength of 28d was 28.6MPa or less, without changing the weight of the raw materials.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present application, and that the present application is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as within the scope of the invention.
Claims (9)
1. The high-strength concrete based on the machine-made aggregate is characterized by comprising, by weight, 140-160 parts of water, 360-420 parts of cement, 400-465 parts of machine-made fine aggregate, 980-1160 parts of machine-made coarse aggregate, 20-40 parts of rubber particles, 25-35 parts of silicon carbide powder and 30-45 parts of basalt fiber.
2. The high-strength concrete based on the machine-made aggregate as claimed in claim 1, characterized by comprising, by weight, 140-150 parts of water, 360-390 parts of cement, 400-465 parts of machine-made fine aggregate, 980-1160 parts of machine-made coarse aggregate, 30-40 parts of rubber particles, 30-35 parts of silicon carbide powder, and 40-45 parts of basalt fiber.
3. The high-strength concrete based on the machine-made aggregate is characterized by comprising 140 parts of water, 360 parts of cement, 400 parts of machine-made fine aggregate, 980 parts of machine-made coarse aggregate, 30 parts of rubber particles, 30 parts of silicon carbide powder and 40 parts of basalt fibers in parts by weight.
4. The high-strength concrete based on the machine-made aggregate according to any one of claims 1 to 3, characterized in that the average particle size of the machine-made coarse aggregate is 10 to 40mm,
preferably, the average particle size of the machine-made coarse aggregate is 20-40mm.
5. The high-strength concrete based on the machine-made aggregate according to any one of claims 1 to 3, characterized in that the fineness modulus of the machine-made fine aggregate is 2.0 to 2.8,
preferably, the fineness modulus of the mechanical fine aggregate is 2.0-2.5.
6. High strength concrete based on machine-made aggregate according to any one of claims 1 to 3, characterized in that the rubber particles have a particle size of 1 to 3mm,
preferably, the rubber particles have a particle size of 2 to 3mm.
7. A high strength concrete based on a machine-made aggregate according to any one of claims 1 to 3, wherein said silicon carbide powder has a particle size of 9.5 to 14 μm,
preferably, the particle size of the silicon carbide powder is 11.5 to 14 μm.
8. The high-strength concrete based on machine-made aggregate according to any one of claims 1 to 3, characterized in that the basalt fiber has a length of 20 to 40mm and a diameter of 16 to 25 μm,
preferably, the basalt fiber has a length of 30 to 40mm and a diameter of 20 to 25 μm.
9. A method for the preparation of high-strength concrete based on a mechanical aggregate according to any one of claims 1 to 8, comprising the steps of,
(1) Bonding the rubber particles on the basalt fibers to prepare an intermediate material;
(2) Bonding the silicon carbide powder on the intermediate material to prepare a prefabricated material;
(3) And mixing the prefabricated material with cement, machine-made fine aggregate and machine-made coarse aggregate according to corresponding parts, and adding water to prepare the high-strength concrete.
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2022
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