CN112142410A - High-strength high-impermeability multilayer graphene oxide concrete and preparation method thereof - Google Patents
High-strength high-impermeability multilayer graphene oxide concrete and preparation method thereof Download PDFInfo
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—Carbon
- C04B14/026—Carbon of particular shape, e.g. nanotubes
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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
- 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
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Abstract
The invention relates to the technical field of concrete, in particular to high-strength high-impermeability multilayer graphene oxide concrete and a preparation method thereof. According to the invention, the graphene oxide with large sheet diameter and multiple layers is adopted, so that the graphene oxide has a bridging effect in the concrete, internal pores can be filled, micro cracks can be connected, the formation of cement hydrated crystals is accelerated, and the microstructure in the concrete is improved. The multilayer graphene oxide concrete disclosed by the invention is tested, the mechanical property and the impermeability of the multilayer graphene oxide concrete are greatly improved, the compression strength and the rupture strength of the multilayer graphene oxide concrete are respectively improved by 17% and 32% in 28 days, the impermeability of the multilayer graphene oxide concrete is improved by 44.8%, the performance of the multilayer graphene oxide concrete is obviously improved, and the limitation of the traditional concrete is improved. And the multilayer graphene oxide used in the invention is multilayer and large in sheet diameter, so that the preparation is simpler and more economic than other nano materials, the economic practicability is greatly improved, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to high-strength high-impermeability multilayer graphene oxide concrete and a preparation method thereof.
Background
As one of the most widely used building materials, cement is widely applied to buildings, bridges and other projects. However, the development of cement-based materials is limited by the disadvantages of low bending strength, poor crack resistance and the like. To overcome the disadvantages, some scholars incorporate materials such as polypropylene fibers and steel fibers, but the incorporation of materials such as steel fibers does not improve the microstructure of the cement-based materials nor inhibit the development of microcracks in the cement. In recent years, nanomaterials such as carbon nanotubes, carbon fibers and graphene have attracted much attention due to their ultra-high strength and stretchability, and have been widely studied to improve various properties of composite materials. Therefore, many researchers have studied to improve the mechanical properties, durability and impermeability of cement-based materials by blending nano materials to improve the geometrical structure of the cement-based materials on a microscopic scale.
Graphene oxide is a novel two-dimensional carbon nanomaterial at present, has extremely strong mechanical properties, and the tensile strength of multilayer graphene oxide can reach 130MPa, so that the strength of a cement-based material can be improved. However, the thickness of graphene oxide used in the existing cement-based materials is small, and the sheet diameter is small, so that the cost of the cement material is high.
Disclosure of Invention
The invention aims to provide high-strength high-impermeability multilayer graphene oxide concrete and a preparation method thereof, and the prepared concrete has high strength and high impermeability and is low in cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides high-strength high-impermeability multilayer graphene oxide concrete which comprises the following preparation raw materials in parts by weight: 350-400 parts of reference cement, 650-700 parts of graded sand, 1000-1400 parts of stones, 180-220 parts of water and 0.01-0.4 part of multilayer graphene oxide; the purity of the multilayer graphene oxide is more than or equal to 95%, the sheet diameter is 10-50 mu m, the thickness is 3.4-7.0 nm, and the number of layers is 5-10.
Preferably, the preparation raw materials comprise: 387 parts of standard cement, 685 parts of graded sand, 1115 parts of stones, 205 parts of water and 0.193 part of multilayer graphene oxide.
Preferably, the reference cement is a reference cement with the strength of 42.5.
Preferably, the fineness modulus of the graded sand is 2.6-2.9, and the mud content is less than 5%.
Preferably, the stones are secondary graded stones, the stones with the particle size of 5 mm-10 mm account for 40% of the total volume of the stones, and the stones with the particle size of 10 mm-20 mm account for 60% of the total volume of the stones.
The invention provides a preparation method of the high-strength high-impermeability multilayer graphene oxide concrete, which comprises the following steps:
dispersing the multilayer graphene oxide into first part of water to obtain multilayer graphene oxide dispersion liquid;
pre-mixing the reference cement, the graded sand, the stones and the second part of water to obtain a pre-mixed mixture;
adding the multilayer graphene oxide dispersion liquid and the rest water into a pre-mixed mixture to be stirred to obtain slurry;
and filling the slurry into a test mold, compacting, wiping off the slurry on the upper surface of the test mold to level the upper surface of the test piece, removing the mold after the test piece is molded, and performing standard maintenance to obtain the high-strength high-impermeability multilayer graphene oxide concrete.
Preferably, the first portion of water is 10% of the total amount of water and the second portion of water is 40% of the total amount of water.
Preferably, the standard curing is carried out in a standard curing room, the temperature of the standard curing is 18-22 ℃, the humidity is more than or equal to 95%, and the time is 28 days.
Preferably, the conditions for forming the test piece include: the mixture was maintained in a thermostatic chamber at 20 ℃ and 20% humidity for 24 hours.
Preferably, the dispersion is carried out under stirring and ultrasonic conditions in sequence.
The invention provides high-strength high-impermeability multilayer graphene oxide concrete which comprises the following preparation raw materials in parts by weight: 350-400 parts of reference cement, 650-700 parts of graded sand, 1000-1400 parts of stones, 180-220 parts of water and 0.01-0.4 part of multilayer graphene oxide; the purity of the multilayer graphene oxide is more than or equal to 95%, the sheet diameter is 10-50 mu m, the thickness is 3.4-7.0 nm, and the number of layers is 5-10.
According to the invention, the graphene oxide with large sheet diameter and multiple layers is adopted, so that the graphene oxide has a bridging effect in the concrete, internal pores can be filled, micro cracks can be connected, the formation of cement hydrated crystals is accelerated, and the microstructure in the concrete is improved. The multilayer graphene oxide concrete disclosed by the invention is tested, the mechanical property and the impermeability of the multilayer graphene oxide concrete are greatly improved, the compression strength and the rupture strength of the multilayer graphene oxide concrete are respectively improved by 17% and 32% in 28 days, the impermeability of the multilayer graphene oxide concrete is improved by 44.8%, the performance of the multilayer graphene oxide concrete is obviously improved, and the limitation of the traditional concrete is improved.
And the multilayer graphene oxide used in the invention is multilayer and large in sheet diameter, so that the preparation is simpler and more economic than other nano materials, the economic practicability is greatly improved, and the cost is reduced.
Drawings
FIG. 1 is a TEM image of a multilayer graphene oxide used in the present invention;
FIG. 2 is a three-dimensional graph of concrete performance as the doping amount of multi-layered graphene oxide increases;
FIG. 3 is a graph showing slump changes between comparative examples and examples of the present invention;
FIG. 4 is a graph showing the change in the impermeability of a concrete specimen of comparative example and example 28 days in accordance with the present invention;
FIG. 5 is a graph showing the change in compressive strength of concrete specimens of comparative example and example 28 days in accordance with the present invention.
Detailed Description
The invention provides high-strength high-impermeability multilayer graphene oxide concrete which comprises the following preparation raw materials in parts by weight: 350-400 parts of reference cement, 650-700 parts of graded sand, 1000-1400 parts of stones, 180-220 parts of water and 0.01-0.4 part of multilayer graphene oxide; the purity of the multilayer graphene oxide is more than or equal to 95%, the sheet diameter is 10-50 mu m, the thickness is 3.4-7.0 nm, and the number of layers is 5-10.
In the present invention, the starting materials used are all commercially available products well known in the art, unless otherwise specified.
The preparation raw materials of the high-strength high-impermeability multilayer graphene oxide concrete comprise 350-400 parts by weight of reference cement, preferably 360-390 parts by weight of reference cement, and more preferably 387 parts by weight of reference cement. In the present invention, the reference cement is preferably a reference cement having a strength of 42.5.
Based on the weight parts of the reference cement, the preparation raw materials of the high-strength and high-impermeability multilayer graphene oxide concrete provided by the invention comprise 650-700 parts of graded sand, preferably 660-690 parts, and more preferably 685 parts of the graded sand. In the invention, the fineness modulus of the graded sand is preferably 2.6-2.9, more preferably 2.7-2.8, and the mud content is preferably less than 5%. The invention can reduce the porosity of the concrete by adopting the graded sand.
By taking the weight parts of the reference cement as a reference, the preparation raw materials of the high-strength high-impermeability multilayer graphene oxide concrete provided by the invention comprise 1000-1400 parts of stones, preferably 1100-1300 parts, and more preferably 1115 parts. In the invention, the stones are preferably secondary graded stones, wherein stones with the particle size of 5 mm-10 mm account for 40% of the total volume of the stones, and stones with the particle size of 10 mm-20 mm account for 60% of the total volume of the stones. In the present invention, the secondary gradation is preferably a continuous gradation. The invention can reduce the porosity of concrete by adopting the graded stones.
By taking the weight parts of the reference cement as a reference, the preparation raw materials of the high-strength high-impermeability multilayer graphene oxide concrete provided by the invention comprise 180-220 parts of water, preferably 190-210 parts of water, and more preferably 205 parts of water.
Based on the weight parts of the reference cement, the preparation raw materials of the high-strength high-impermeability multilayer graphene oxide concrete provided by the invention comprise 0.01-0.4 part of multilayer graphene oxide, preferably 0.1-0.3 part, and more preferably 0.193 part. In the invention, the purity of the multilayer graphene oxide is more than or equal to 95%, the sheet diameter is 10-50 μm, preferably 20-40 μm, and more preferably 25-35 μm; the thickness is 3.4 to 7.0nm, preferably 4.0 to 6.0nm, and more preferably 4.5 to 5.5 nm; the number of layers is 5 to 10, preferably 6 to 9.
According to the invention, the graphene oxide with large sheet diameter and multiple layers is adopted, so that the graphene oxide has a bridging effect in the concrete, internal pores can be filled, micro cracks can be connected, the formation of cement hydrated crystals is accelerated, the microstructure in the concrete is improved, and the concrete has good mechanical property and high impermeability.
The invention provides a preparation method of the high-strength high-impermeability multilayer graphene oxide concrete, which comprises the following steps:
dispersing the multilayer graphene oxide into first part of water to obtain multilayer graphene oxide dispersion liquid;
pre-mixing the reference cement, the graded sand, the stones and the second part of water to obtain a pre-mixed mixture;
adding the multilayer graphene oxide dispersion liquid and the rest water into a pre-mixed mixture to be stirred to obtain slurry;
and filling the slurry into a test mold, compacting, wiping off the slurry on the upper surface of the test mold to level the upper surface of the test piece, removing the mold after the test piece is molded, and performing standard maintenance to obtain the high-strength high-impermeability multilayer graphene oxide concrete.
According to the invention, multilayer graphene oxide is dispersed in a first part of water to obtain a multilayer graphene oxide dispersion liquid.
In the present invention, the dispersion includes stirring and sonication, which are performed sequentially. The invention has no special requirement on the stirring condition, and can be stirred until the water surface does not contain suspended multilayer graphene oxide. In the invention, the ultrasonic time is 20-30 min, the power of the ultrasonic is not specially required, and the ultrasonic power known in the field is adopted. In the present invention, the first portion of water preferably accounts for 10% of the total amount of water.
The invention pre-mixes the reference cement, the graded sand, the gravel and the second part of water to obtain a pre-mixed mixture.
In the invention, the rotation speed of the pre-mixing is preferably 35r/min, and the time is preferably 60-80 s. In the present invention, the premixing is preferably performed in a concrete mixer.
In the present invention, the second portion of water preferably comprises 40% of the total amount of water.
After the multilayer graphene oxide dispersion liquid and the premixed mixture are obtained, the multilayer graphene oxide dispersion liquid and the rest water are added into the premixed mixture to be stirred, and the slurry is obtained.
In the invention, the rotation speed of the stirring is preferably 35r/min, and the time is preferably 100-120 s.
According to the invention, the multilayer graphene oxide is dispersed in water, and then the uniformly distributed and well combined multilayer graphene oxide dispersion liquid is added into concrete as an additive, so that the uniformly dispersed multilayer graphene oxide concrete is obtained.
After the slurry is obtained, the slurry is filled into a test mold, after compaction, the slurry body on the upper surface of the test mold is wiped off to level the upper surface of the test piece, the mold is removed after the test piece is molded, and standard maintenance is carried out to obtain the high-strength and high-impermeability multilayer graphene oxide concrete.
In the invention, the test mould is preferably oiled to facilitate mould removal. In the present invention, the tapping is preferably performed on a vibrating table.
In the present invention, the conditions for molding the test piece preferably include: the mixture was maintained in a thermostatic chamber at 20 ℃ and 20% humidity for 24 hours.
The invention has no special requirements on the stripping process, and the stripping process known in the field can be adopted.
In the invention, the standard curing is preferably carried out in a standard curing chamber, and the temperature of the standard oxidation is preferably 18-22 ℃, and more preferably 20 ℃; the humidity is preferably more than or equal to 95 percent; the time period is preferably 28 days.
The high-strength high-impermeability multilayer graphene oxide concrete and the preparation method thereof provided by the present invention are described in detail below with reference to the examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The purity of the multilayer graphene oxide is more than or equal to 95%, the sheet diameter is 10-50 mu m, the thickness is 3.4-7.0 nm, and the number of layers is 5-10; FIG. 1 is a TEM micrograph of a multilayer graphene oxide, which is multilayer and large-sheet-diameter as can be seen from FIG. 1; the reference cement is 42.5 in strength, and the fineness modulus of the graded sand is 2.7; the stones are secondary graded stones, the stones with the grain diameter of 5 mm-10 mm account for 40% of the total volume of the stones, and the stones with the grain diameter of 10 mm-20 mm account for 60% of the total volume of the stones;
slowly adding 0.038 part of multilayer graphene oxide into 20.5 parts of water for mixing, magnetically stirring until the multilayer graphene oxide does not suspend on the water surface, putting the preliminarily stirred dispersion solution into an ultrasonic instrument, and performing ultrasonic dispersion for 30min to obtain a multilayer graphene oxide dispersion solution for later use; then putting 387 parts of reference cement, 685 parts of graded sand, 1115 parts of stones and 82 parts of water into a concrete mixer for pre-mixing, and uniformly mixing for 80s to obtain a pre-mixed mixture; adding the prepared multilayer graphene oxide dispersion liquid and 102.5 parts of water, uniformly stirring for 120s at a constant rotating speed, and discharging to obtain slurry; pouring the slurry into an oiling test mold, placing the oiling test mold on a vibration table for vibration for 40s, then placing the oiling test mold in a constant temperature room with the temperature of 20 ℃ and the humidity of 20% for curing for 24 hours to complete molding, and placing the oiling test mold in a standard curing room with the temperature of 20 +/-2 ℃ and the humidity of more than or equal to 95% for standard curing for 28 days after mold stripping.
Example 2
The purity of the multilayer graphene oxide is more than or equal to 95%, the sheet diameter is 10-50 mu m, the thickness is 3.4-7.0 nm, and the number of layers is 5-10; the reference cement is 42.5 in strength, and the fineness modulus of the graded sand is 2.7; the stones are secondary graded stones, the stones with the grain diameter of 5 mm-10 mm account for 40% of the total volume of the stones, and the stones with the grain diameter of 10 mm-20 mm account for 60% of the total volume of the stones;
slowly adding 0.193 parts of multilayer graphene oxide into 20.5 parts of water, mixing, magnetically stirring until the multilayer graphene oxide does not suspend on the water surface, placing the preliminarily stirred dispersion solution in an ultrasonic instrument, and performing ultrasonic dispersion for 30min to obtain a multilayer graphene oxide dispersion solution for later use; then putting 387 parts of reference cement, 685 parts of graded sand, 1115 parts of stones and 82 parts of water into a concrete mixer for pre-mixing, and uniformly mixing for 80s to obtain a pre-mixed mixture; adding the prepared multilayer graphene oxide dispersion liquid and 102.5 parts of water, uniformly stirring for 120s at a constant rotating speed, and discharging to obtain slurry; pouring the slurry into an oiling test mold, placing the oiling test mold on a vibration table for vibration for 40s, then placing the oiling test mold in a constant temperature room with the temperature of 20 ℃ and the humidity of 20% for curing for 24 hours to complete molding, and placing the oiling test mold in a standard curing room with the temperature of 20 +/-2 ℃ and the humidity of more than or equal to 95% for standard curing for 28 days after mold stripping.
Example 3
The purity of the multilayer graphene oxide is more than or equal to 95%, the sheet diameter is 10-50 mu m, the thickness is 3.4-7.0 nm, and the number of layers is 5-10; the reference cement is 42.5 in strength, and the fineness modulus of the graded sand is 2.7; the stones are secondary graded stones, the stones with the grain diameter of 5 mm-10 mm account for 40% of the total volume of the stones, and the stones with the grain diameter of 10 mm-20 mm account for 60% of the total volume of the stones;
slowly adding 0.387 parts of multilayer graphene oxide into 20.5 parts of water for mixing, magnetically stirring until the water surface does not contain the suspended multilayer graphene oxide, putting the preliminarily stirred dispersion solution into an ultrasonic instrument, and performing ultrasonic dispersion for 30min to obtain a multilayer graphene oxide dispersion solution for later use; then putting 387 parts of reference cement, 685 parts of graded sand, 1115 parts of stones and 82 parts of water into a concrete mixer for pre-mixing, and uniformly mixing for 80s to obtain a pre-mixed mixture; adding the prepared multilayer graphene oxide dispersion liquid and 102.5 parts of water, uniformly stirring for 120s at a constant rotating speed, and discharging to obtain slurry; pouring the slurry into an oiling test mold, placing the oiling test mold on a vibration table for vibration for 40s, then placing the oiling test mold in a constant temperature room with the temperature of 20 ℃ and the humidity of 20% for curing for 24 hours to complete molding, and placing the oiling test mold in a standard curing room with the temperature of 20 +/-2 ℃ and the humidity of more than or equal to 95% for standard curing for 28 days after mold stripping.
Comparative example 1
Multilayer graphene oxide is not added, and the specific steps are as follows:
putting 387 parts of reference cement, 685 parts of graded sand, 1115 parts of stones and 100 parts of water into a stirrer, and uniformly stirring for 80s to obtain a ready-mixed mixture; then adding 105 parts of water, uniformly stirring for 120s at a constant rotating speed, and discharging to obtain common concrete slurry; pouring the common concrete slurry into a mold, placing the mold on a vibration table for vibration for 40s, then placing the mold in a constant temperature room with the temperature of 20 ℃ and the humidity of 20% for curing for 24 hours to complete molding, and placing the mold after removal in a standard curing room with the temperature of 20 +/-2 ℃ and the humidity of more than or equal to 95% for standard curing for 28 days.
Performing performance tests on the concrete prepared in the embodiments 1-3 and the comparative example 1, wherein the test method of the compressive strength and the flexural strength refers to relevant regulations of 'standard of mechanical property test method of common concrete' GB/T50081-2019; the test method for the impermeability is as follows: 1. mounting the dried impervious test piece on a concrete impermeability instrument; 2. the water pressure of the impermeability instrument is gradually increased from 0.1MPa to 0.6MPa according to the rule that the water pressure is increased by 0.1MPa every 8 hours; after 48 hours, the test pieces were removed and chiseled open, and the water penetration height of the concrete was recorded as an evaluation standard for the impermeability of the concrete. Specific test results are shown in FIGS. 2-5 and Table 1.
TABLE 1 Properties of concrete examples and comparative examples
| Slump (mm) | Height of water penetration (mm) | Compressive strength (MPa) | Flexural strength (MPa) | |
| Comparative example 1 | 108.1 | 108.1 | 40.7 | 5.1 |
| Example 1 | 78.9 | 78.9 | 44.5 | 5.3 |
| Example 2 | 68.5 | 68.5 | 49 | 7.5 |
| Example 3 | 59.6 | 59.6 | 46 | 6 |
As can be seen from Table 1, the mechanical properties of the multilayer graphene oxide concrete prepared by the method are obviously superior to those of common cement mortar, the average compressive strength of the multilayer graphene oxide concrete is enhanced by 17 percent compared with that of the common cement mortar, the average flexural strength of the multilayer graphene oxide concrete is enhanced by 32 percent, and the impermeability is improved by 44.8 percent. As can be seen from FIGS. 2 to 5, the doping amount of the multilayer graphene oxide of 0.193 parts is the optimal choice for the case of 387 parts of the standard cement, 685 parts of the graded sand, 1115 parts of the stones and 205 parts of water.
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 (10)
1. The high-strength high-impermeability multilayer graphene oxide concrete is characterized by comprising the following preparation raw materials in parts by weight: 350-400 parts of reference cement, 650-700 parts of graded sand, 1000-1400 parts of stones, 180-220 parts of water and 0.01-0.4 part of multilayer graphene oxide; the purity of the multilayer graphene oxide is more than or equal to 95%, the sheet diameter is 10-50 mu m, the thickness is 3.4-7.0 nm, and the number of layers is 5-10.
2. The high-strength high-impermeability multilayer graphene oxide concrete according to claim 1, wherein the preparation raw materials comprise: 387 parts of standard cement, 685 parts of graded sand, 1115 parts of stones, 205 parts of water and 0.193 part of multilayer graphene oxide.
3. The high-strength high-impermeability multilayer graphene oxide concrete according to claim 1 or 2, wherein the reference cement is a reference cement with a strength of 42.5.
4. The high-strength high-impermeability multilayer graphene oxide concrete according to claim 1 or 2, wherein the fineness modulus of the graded sand is 2.6-2.9, and the mud content is less than 5%.
5. The high-strength high-impermeability multilayer graphene oxide concrete according to claim 1, wherein the stones are secondary graded stones, stones with a particle size of 5mm to 10mm account for 40% of the total volume of the stones, and stones with a particle size of 10mm to 20mm account for 60% of the total volume of the stones.
6. The preparation method of the high-strength high-impermeability multilayer graphene oxide concrete according to any one of claims 1 to 5, characterized by comprising the following steps:
dispersing the multilayer graphene oxide into first part of water to obtain multilayer graphene oxide dispersion liquid;
pre-mixing the reference cement, the graded sand, the stones and the second part of water to obtain a pre-mixed mixture;
adding the multilayer graphene oxide dispersion liquid and the rest water into a pre-mixed mixture to be stirred to obtain slurry;
and filling the slurry into a test mold, compacting, wiping off the slurry on the upper surface of the test mold to level the upper surface of the test piece, removing the mold after the test piece is molded, and performing standard maintenance to obtain the high-strength high-impermeability multilayer graphene oxide concrete.
7. The method of claim 6, wherein the first portion of water is 10% of the total amount of water and the second portion of water is 40% of the total amount of water.
8. The preparation method of claim 6, wherein the standard curing is carried out in a standard curing chamber, the temperature of the standard curing is 18-22 ℃, the humidity is not less than 95%, and the time is 28 days.
9. The production method according to claim 6, wherein the conditions under which the test piece is molded include: the mixture was maintained in a thermostatic chamber at 20 ℃ and 20% humidity for 24 hours.
10. The method of claim 6, wherein the dispersing is performed under stirring and ultrasonic conditions in sequence.
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| CN113264744A (en) * | 2021-07-01 | 2021-08-17 | 深圳市明远建筑科技有限公司 | Nano graphene concrete material for building 3D printing and preparation method thereof |
| CN114507047A (en) * | 2022-02-24 | 2022-05-17 | 哈尔滨工业大学（威海） | Graphene reinforced concrete and preparation method thereof |
| CN114790097A (en) * | 2022-04-13 | 2022-07-26 | 沙洲职业工学院 | Impermeable concrete for reservoir dam and preparation method thereof |
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