CN113372064A - Graphene oxide modified cement concrete and preparation method thereof - Google Patents
Graphene oxide modified cement concrete and preparation method thereof Download PDFInfo
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- CN113372064A CN113372064A CN202110700098.1A CN202110700098A CN113372064A CN 113372064 A CN113372064 A CN 113372064A CN 202110700098 A CN202110700098 A CN 202110700098A CN 113372064 A CN113372064 A CN 113372064A
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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 provides graphene oxide modified cement concrete which comprises the following components: 300-500 parts of cement; 150-300 parts of fine sand; 100-200 parts of medium coarse sand; 80-110 parts of mineral powder; 1000-1150 parts of crushed stone; 0.6-1.2 parts of concrete fiber; 5-15 parts of graphene oxide; 5-10 parts of a water reducing agent; 4-8 parts of a dispersing agent; 4-8 parts of a retarder; 120-200 parts of water. According to the invention, by optimizing the components of the graphene oxide modified cement concrete, the technical problems of poor durability and low fluidity of the traditional cement concrete are solved.
Description
Technical Field
The invention relates to the field of building materials, in particular to graphene oxide modified cement concrete and a preparation method thereof.
Background
As a building material with large consumption and wide application range in the world, the concrete has good mechanical property, economy and environmental adaptability and is widely developed in various countries. With the development of society, the urbanization construction and the rapid development of highways in China, higher requirements are put forward on the performance of concrete: that is, not only high strength and durability of concrete but also good fluidity of concrete are required.
The common concrete is artificial stone which is prepared by taking cement as a main cementing material, adding water, sand, stones and chemical additives and mineral admixtures if necessary, mixing the materials according to a proper proportion, uniformly stirring, densely molding, curing and hardening.
The biggest problem of the graphene-based material in the application is that its dispersibility in the base material is poor. It is known that, as a substance composed of pure carbon elements, graphene has very poor dispersibility in water, and is almost insoluble in water, thus resulting in poor compatibility with cement substrates; thus, when the graphene is added into the cement base material, the phenomenon that the graphene is seriously agglomerated and is difficult to disperse occurs. In the related art, the graphene oxide is directly added into the cement paste, the phenomenon of agglomeration of the graphene oxide in the cement paste occurs, and the fluidity of the mixed slurry is easily reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides graphene oxide modified cement concrete and a preparation method thereof, and aims to solve the technical problems of poor durability and low fluidity of the traditional concrete in the related art.
The invention provides graphene oxide modified cement concrete which comprises the following components in parts by mass:
300-500 parts of cement;
150-300 parts of fine sand;
100-200 parts of medium coarse sand;
80-110 parts of mineral powder;
1000-1150 parts of crushed stone;
0.6-1.2 parts of concrete fiber;
5-15 parts of graphene oxide;
5-10 parts of a water reducing agent;
4-8 parts of a dispersing agent;
4-8 parts of a retarder;
120-200 parts of water.
Optionally, the cement is portland cement.
Optionally, the crushed stones comprise first gradient crushed stones with the particle size of 5-10 mm, second gradient crushed stones with the particle size of 10-16 mm and third gradient crushed stones with the particle size of 16-20 mm;
wherein the mass ratio of the first gradient crushed stone, the second gradient crushed stone and the third gradient crushed stone is 5: (2.5-3.5): (1.5-2.5).
Optionally, the mass ratio of the first, second and third graded crushed stones is 5:3: 2.
Optionally, the water reducer is a polycarboxylic acid water reducer.
Optionally, the dispersant is one or a combination of calcium lignosulfonate, sodium lignosulfonate, gallic acid, polyvinylpyrrolidone and sodium alginate.
The invention also provides a preparation method of the graphene oxide modified cement concrete, which comprises the following specific steps:
step S1: preparing a graphene oxide solution: preparing graphene oxide dispersion liquid with the concentration of 5mg/mL by taking graphene oxide and water; respectively adding a water reducing agent, a dispersing agent and a retarder according to the components in the graphene oxide modified cement concrete, and uniformly stirring to obtain a graphene oxide mixed solution;
step S2: and (3) weighing cement, fine sand, medium coarse sand, mineral powder, broken stone and concrete fiber according to the components in the graphene oxide modified cement concrete, mixing the cement, the fine sand, the medium coarse sand, the mineral powder, the broken stone and the concrete fiber in the graphene oxide mixed solution obtained in the step S1, and uniformly stirring to obtain the graphene oxide modified cement concrete.
Compared with the prior art, the invention has the following beneficial effects:
in the technology of the invention, the performance of the traditional cement concrete is improved by optimizing the components of the graphene oxide modified cement concrete, so that the flexural strength, compressive strength, crack resistance, durability and fluidity of the cement concrete are improved. According to the invention, graphene oxide modified cement concrete is prepared from graphene oxide, a dispersing agent, concrete fibers and cement slurry, and the strength and durability of the cement concrete are improved and the flow property of the cement concrete is optimized through the interaction and mutual influence relationship among the components, so that the construction requirement is better met. The whole graphene oxide modified cement concrete greatly improves the tensile strength, the breaking strength and the cracking resistance of a cement-based material; moreover, the fluidity of the cement concrete is improved while the strength of the cement concrete is ensured; meanwhile, microcracks caused by plastic shrinkage, drying shrinkage, temperature change and the like of the concrete/mortar are effectively controlled, the anti-cracking and anti-permeability performance and the anti-abrasion performance of the concrete/mortar are effectively improved, and the service life of the concrete is effectively prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are further described below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The traditional cement concrete is prepared by adopting a method of coating sand by cement mortar, but the method has many defects in actual operation, such as difficulty in completely coating the sand by the cement mortar and uneven sand coating by the cement mortar. Based on the above, Lvshenghua et al have studied the content of the graphene oxide reinforced and toughened cement-based composite material in the article "research on graphene oxide reinforced and toughened cement-based composite material" (functional material 2013,44(15): 2227-2231.). Chu Hongyan et al, Mechanical and thermal properties of graphene sulfate recycled concrete transformed at an improved temperature, found that graphene nanoplates have the effect of enhancing and toughening the microstructure of concrete. Chinese patent CN103130466A discloses a graphene/cement matrix composite material, which improves the mechanical property and the electrical property; and Chinese patent CN 109678439A discloses a high-fluidity cement concrete and a preparation method thereof, and the fluidity of the cement concrete is improved to a certain extent by introducing graphene oxide.
However, due to the intermolecular force and the large specific surface area of the graphene-based nanomaterial, the graphene-based nanomaterial is easily agglomerated in a water solvent, and thus the reinforcing effect of the graphene-based material is lost. Chinese patent CN 109678439A discloses a high-fluidity cement concrete and a preparation method thereof, wherein the cement concrete comprises 600 parts of sulphoaluminate cement, 400 parts of fine sand, 300 parts of medium coarse sand, 120 parts of mineral powder, 15-25 parts of graphene oxide, 75-85 parts of hollow glass microspheres, 50-80 parts of gypsum, 33-49 parts of composite admixture, 320 parts of water, and 0.6-1.2 parts of concrete fibers.
It is understood that graphene oxide is prone to coagulation in a high calcium and high alkali environment. In the related art, the strength of cement concrete can be improved by adding graphene oxide into a cement-based material, but the fluidity of the cement concrete is also reduced. Therefore, the dispersion performance of the graphene oxide is optimized, so that the graphene oxide has good dispersion performance in water; and the interaction/influence between the graphene oxide and each component needs to be complemented, and the conflict contradiction on the function or the microstructure cannot exist; the two become the key points of the graphene oxide modified cement concrete.
Based on the above, the invention provides graphene oxide modified cement concrete, which comprises the following components in parts by mass:
300-500 parts of cement;
150-300 parts of fine sand;
100-200 parts of medium coarse sand;
80-110 parts of mineral powder;
1000-1150 parts of crushed stone;
0.6-1.2 parts of concrete fiber;
5-15 parts of graphene oxide;
5-10 parts of a water reducing agent;
4-8 parts of a dispersing agent;
4-8 parts of a retarder;
120-200 parts of water.
In this example, concrete fibers were added to improve the impermeability and abrasion resistance of the cement concrete. It should be understood that the concrete fiber can effectively control the microcracks of the concrete/mortar caused by plastic shrinkage, drying shrinkage, temperature change and other factors, so as to prevent the formation and development of the primary cracks of the cement concrete, further enhance the toughness of the cement concrete and effectively prolong the service life of the cement concrete. In order to improve the impermeability, the breaking strength and the compressive strength of the cement concrete, the graphene oxide is added. It should be explained that the addition of the graphene oxide increases the number of gel pores and capillary pores in the cement concrete slurry, so that the lamellar structure of the graphene oxide can play a role in sealing and blocking part of the capillary pores, thereby improving the impermeability, the folding resistance and the compression resistance of the concrete product. In order to overcome the agglomeration phenomenon of the graphene oxide, a water reducing agent is added. For example, but not limited to, the water reducing agent is a polycarboxylic acid water reducing agent (PC). Thus, the water reducing agent can be added to prevent the generation of bubbles, and the electrostatic interaction and the steric hindrance provided by the PC can further enable the graphene oxide to be stably dispersed in the aqueous solution (see the research in Yuan ya et al 'influence of different water reducing agents on mechanical properties and microstructures of graphene oxide blended cement mortar' (functional materials, 2018,49(10): 10184-. In order to improve the dispersion performance of the graphene oxide, a dispersant is added.
Optionally, the cement is portland cement. For example, but not limited to, the cement is p.o.42.5 portland cement. For example, but not limited to, the p.o.42.5 portland cement is p.o.42.5 concha portland cement.
Optionally, the crushed stones comprise first gradient crushed stones with the particle size of 5-10 mm, second gradient crushed stones with the particle size of 10-16 mm and third gradient crushed stones with the particle size of 16-20 mm;
wherein the mass ratio of the first gradient crushed stone, the second gradient crushed stone and the third gradient crushed stone is 5: (2.5-3.5): (1.5-2.5).
Optionally, the mass ratio of the first, second and third graded crushed stones is 5:3: 2.
Optionally, the water reducer is a polycarboxylic acid water reducer.
Optionally, the dispersant is one or a combination of calcium lignosulfonate, sodium lignosulfonate, gallic acid, polyvinylpyrrolidone and sodium alginate. For example, but not limited to, the polyvinylpyrrolidone is polyvinylpyrrolidone K30.
The invention also provides a preparation method of the graphene oxide modified cement concrete, which comprises the following specific steps:
step S1: preparing a graphene oxide solution: preparing graphene oxide dispersion liquid with the concentration of 5mg/mL by taking graphene oxide and water; respectively adding a water reducing agent, a dispersing agent and a retarder according to the components in the graphene oxide modified cement concrete, and uniformly stirring to obtain a graphene oxide mixed solution;
step S2: and (3) weighing cement, fine sand, medium coarse sand, mineral powder, broken stone and concrete fiber according to the components in the graphene oxide modified cement concrete, mixing the cement, the fine sand, the medium coarse sand, the mineral powder, the broken stone and the concrete fiber in the graphene oxide mixed solution obtained in the step S1, and uniformly stirring to obtain the graphene oxide modified cement concrete.
In the embodiment, a preparation process of graphene oxide modified cement concrete is provided, which includes preparing a graphene oxide mixed solution, and then adding the graphene oxide mixed solution into a cement-based material to prepare the graphene oxide modified cement concrete. The whole process is simple and easy to operate, and the dispersion performance of the traditional graphene material in cement paste is greatly improved. In addition, the graphene oxide modified cement concrete prepared by the preparation method provided by the invention has the advantages of high tensile strength, high breaking strength, strong cracking resistance, strong fluidity and the like.
To further illustrate the effect of the graphene oxide modified cement concrete provided by the present invention, the following example sets are selected for detailed description. It should be understood that the following example sets are only for illustrating the effect of the graphene oxide modified cement concrete of the present invention, and do not limit the graphene oxide modified cement concrete of the present invention.
It should be noted that the experimental methods used in the following examples are all conventional methods unless otherwise specified. Materials, reagents, equipment and the like used in the following examples are commercially available unless otherwise specified.
1. Preparation of Experimental group Cement concrete
Example 1
1.1 the components of the graphene oxide modified cement concrete:
300 parts of cement, 150 parts of fine sand, 100 parts of medium coarse sand, 80 parts of mineral powder, 1000 parts of crushed stone (wherein the mass ratio of 5-10 mm first gradient crushed stone, 10-16 mm second gradient crushed stone and 16-20 mm third gradient crushed stone is 5:3:2), 120 parts of water, 0.6 part of concrete fiber, 5 parts of graphene oxide, 5 parts of a water reducing agent, 4 parts of a dispersing agent and 4 parts of a retarder.
1.2 preparation of graphene oxide modified cement concrete:
step S1: preparing a graphene oxide solution: preparing graphene oxide dispersion liquid with the concentration of 5mg/mL by taking graphene oxide and water; respectively adding a water reducing agent, a dispersing agent and a retarder according to the components in the graphene oxide modified cement concrete, and uniformly stirring to obtain a graphene oxide mixed solution;
step S2: and (3) weighing cement, fine sand, medium coarse sand, mineral powder, broken stone and concrete fiber according to the components in the graphene oxide modified cement concrete, mixing the cement, the fine sand, the medium coarse sand, the mineral powder, the broken stone and the concrete fiber in the graphene oxide mixed solution obtained in the step S1, and uniformly stirring to obtain the graphene oxide modified cement concrete.
1.3 preparation of Cement concrete for control 1:
taking 300 parts of cement, 150 parts of fine sand, 100 parts of medium coarse sand, 80 parts of mineral powder, 1000 parts of crushed stone (wherein the mass ratio of 5-10 mm first gradient crushed stone, 10-16 mm second gradient crushed stone and 16-20 mm third gradient crushed stone is 5:3:2), 120 parts of water and 0.6 part of concrete fiber, and uniformly mixing to obtain the cement concrete of the control group 1.
Example 2
1.1 the components of the graphene oxide modified cement concrete:
500 parts of cement, 300 parts of fine sand, 200 parts of medium coarse sand, 110 parts of mineral powder, 1150 parts of crushed stone (wherein the mass ratio of 5-10 mm first gradient crushed stone, 10-16 mm second gradient crushed stone and 16-20 mm third gradient crushed stone is 5:3:2), 200 parts of water, 1.2 parts of concrete fiber, 15 parts of graphene oxide, 10 parts of water reducing agent, 8 parts of dispersing agent and 8 parts of retarder.
1.2 preparation of graphene oxide modified cement concrete:
step S1: preparing a graphene oxide solution: preparing graphene oxide dispersion liquid with the concentration of 5mg/mL by taking graphene oxide and water; respectively adding a water reducing agent, a dispersing agent and a retarder according to the components in the graphene oxide modified cement concrete, and uniformly stirring to obtain a graphene oxide mixed solution;
step S2: and (3) weighing cement, fine sand, medium coarse sand, mineral powder, broken stone and concrete fiber according to the components in the graphene oxide modified cement concrete, mixing the cement, the fine sand, the medium coarse sand, the mineral powder, the broken stone and the concrete fiber in the graphene oxide mixed solution obtained in the step S1, and uniformly stirring to obtain the graphene oxide modified cement concrete.
1.3 preparation of Cement concrete for control 2:
and uniformly mixing 500 parts of cement, 300 parts of fine sand, 200 parts of medium coarse sand, 110 parts of mineral powder, 1150 parts of crushed stone (wherein the mass ratio of 5-10 mm of first gradient crushed stone, 10-16 mm of second gradient crushed stone and 16-20 mm of third gradient crushed stone is 5:3:2), 200 parts of water and 1.2 parts of concrete fiber to obtain the cement concrete of the control group 2.
Example 3
1.1 the components of the graphene oxide modified cement concrete:
400 parts of cement, 280 parts of fine sand, 160 parts of medium coarse sand, 90 parts of mineral powder, 1100 parts of crushed stone (wherein the mass ratio of 5-10 mm first gradient crushed stone, 10-16 mm second gradient crushed stone and 16-20 mm third gradient crushed stone is 5:3:2), 160 parts of water, 0.7 part of concrete fiber, 8 parts of graphene oxide, 7 parts of a water reducing agent, 6 parts of a dispersing agent and 6 parts of a retarder.
1.2 preparation of graphene oxide modified cement concrete:
step S1: preparing a graphene oxide solution: preparing graphene oxide dispersion liquid with the concentration of 5mg/mL by taking graphene oxide and water; respectively adding a water reducing agent, a dispersing agent and a retarder according to the components in the graphene oxide modified cement concrete, and uniformly stirring to obtain a graphene oxide mixed solution;
step S2: and (3) weighing cement, fine sand, medium coarse sand, mineral powder, broken stone and concrete fiber according to the components in the graphene oxide modified cement concrete, mixing the cement, the fine sand, the medium coarse sand, the mineral powder, the broken stone and the concrete fiber in the graphene oxide mixed solution obtained in the step S1, and uniformly stirring to obtain the graphene oxide modified cement concrete.
1.3 preparation of Cement concrete for control 3:
400 parts of cement, 280 parts of fine sand, 160 parts of medium coarse sand, 900 parts of mineral powder, 1100 parts of crushed stone (wherein the mass ratio of 5-10 mm first gradient crushed stone, 10-16 mm second gradient crushed stone and 16-20 mm third gradient crushed stone is 5:3:2), 160 parts of water and 0.7 part of concrete fiber are uniformly mixed to obtain the cement concrete of the control group 3.
Example 4
1.1 the components of the graphene oxide modified cement concrete:
500 parts of cement, 280 parts of fine sand, 200 parts of medium coarse sand, 90 parts of mineral powder, 1050 parts of crushed stone (wherein the mass ratio of 5-10 mm first gradient crushed stone, 10-16 mm second gradient crushed stone and 16-20 mm third gradient crushed stone is 5:3:2), 140 parts of water, 0.7 part of concrete fiber, 6 parts of graphene oxide, 6 parts of a water reducing agent, 5 parts of a dispersing agent and 5 parts of a retarder.
1.2 preparation of graphene oxide modified cement concrete:
step S1: preparing a graphene oxide solution: preparing graphene oxide dispersion liquid with the concentration of 5mg/mL by taking graphene oxide and water; respectively adding a water reducing agent, a dispersing agent and a retarder according to the components in the graphene oxide modified cement concrete, and uniformly stirring to obtain a graphene oxide mixed solution;
step S2: and (3) weighing cement, fine sand, medium coarse sand, mineral powder, broken stone and concrete fiber according to the components in the graphene oxide modified cement concrete, mixing the cement, the fine sand, the medium coarse sand, the mineral powder, the broken stone and the concrete fiber in the graphene oxide mixed solution obtained in the step S1, and uniformly stirring to obtain the graphene oxide modified cement concrete.
1.3 preparation of Cement concrete for control 4:
and uniformly mixing 500 parts of cement, 280 parts of fine sand, 200 parts of medium coarse sand, 90 parts of mineral powder, 1050 parts of crushed stone (wherein the mass ratio of 5-10 mm first gradient crushed stone, 10-16 mm second gradient crushed stone and 16-20 mm third gradient crushed stone is 5:3:2), 140 parts of water and 0.7 part of concrete fiber to obtain the cement concrete of the control group 4.
2. And (3) experimental operation: the cement concrete prepared in example 1 to example 4 and the control groups 1 to 4 in example 1 is stirred, formed, demolded and maintained according to the requirements of the current national standard of the test method standard for physical and mechanical properties of concrete (GB/T50081-2019). The result data shown in table 1 were obtained.
TABLE 1 Performance test results of the respective cement concretes
3. And (4) analyzing results:
as can be seen from table 1, in the cement concrete prepared according to the same mixture ratio of cement, fine sand, medium and coarse sand, mineral powder, crushed stone, water and concrete fiber, the compressive strength, the flexural strength and the fluidity and the slump of the graphene oxide modified cement concrete added with the graphene oxide solution are superior to those of the cement concrete prepared without the graphene oxide solution (i.e., ordinary cement concrete). The graphene oxide modified cement concrete provided by the invention has the performance far superior to that of the traditional cement concrete, effectively enhances the fluidity of the cement concrete, improves the flexural strength and the compressive strength of the cement concrete to a certain extent, and has a positive improvement effect on the durability of the cement concrete.
In addition, compared with the common cement concrete, the flexural strength of the graphene oxide modified cement concrete is improved by 30-50% and the compressive strength is improved by 25-40%.
In summary, the fluidity and mechanical properties of the cement concrete are improved by preparing the graphene oxide mixed solution and then mixing the prepared graphene oxide mixed solution into the cement-based material. It is emphasized that, in the solution proposed in the present invention, in order to solve the technical problems in the related art that the dispersibility of graphene oxide in water is poor, and the mobility of cement concrete is affected by the agglomeration phenomenon easily occurring when graphene oxide is directly added to a cement-based material, a graphene oxide mixed solution needs to be preferentially prepared to improve the dispersibility of graphene oxide in water; and then adding the prepared graphene oxide mixed solution into a cement-based material to avoid the phenomenon that the cement concrete has poor flow property due to agglomeration caused by directly adding the graphene oxide into the cement-based material. Therefore, the graphene oxide modified cement concrete prepared by the preparation method of the graphene oxide modified cement concrete provided by the invention has the advantages of strong crack resistance, high fluidity, low cost and long service life, and can better meet the construction requirements.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The graphene oxide modified cement concrete is characterized by comprising the following components in parts by mass:
300-500 parts of cement;
150-300 parts of fine sand;
100-200 parts of medium coarse sand;
80-110 parts of mineral powder;
1000-1150 parts of crushed stone;
0.6-1.2 parts of concrete fiber;
5-15 parts of graphene oxide;
5-10 parts of a water reducing agent;
4-8 parts of a dispersing agent;
4-8 parts of a retarder;
120-200 parts of water.
2. The graphene oxide-modified cement concrete according to claim 2, wherein the cement is portland cement.
3. The graphene oxide modified cement concrete according to claim 2, wherein the crushed stone comprises a first gradient crushed stone with a particle size of 5-10 mm, a second gradient crushed stone with a particle size of 10-16 mm, and a third gradient crushed stone with a particle size of 16-20 mm;
wherein the mass ratio of the first gradient crushed stone, the second gradient crushed stone and the third gradient crushed stone is 5: (2.5-3.5): (1.5-2.5).
4. The graphene oxide modified cement concrete according to claim 3, wherein the mass ratio of the first gradient crushed stone, the second gradient crushed stone and the third gradient crushed stone is 5:3: 2.
5. The graphene oxide-modified cement concrete according to claim 4, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
6. The graphene oxide-modified cement concrete according to claim 5, wherein the dispersant is one or a combination of calcium lignosulfonate, sodium lignosulfonate, gallic acid, polyvinylpyrrolidone and sodium alginate.
7. The preparation method of the graphene oxide modified cement concrete is characterized by comprising the following specific steps:
step S1: preparing a graphene oxide solution: preparing graphene oxide dispersion liquid with the concentration of 5mg/mL by taking graphene oxide and water; respectively adding a water reducing agent, a dispersing agent and a retarder into the components in the graphene oxide modified cement concrete according to any one of claims 1 to 6, and uniformly stirring to obtain a graphene oxide mixed solution;
step S2: weighing cement, fine sand, medium coarse sand, mineral powder, broken stone and concrete fiber according to the components in the graphene oxide modified cement concrete of any one of claims 1 to 6, mixing the weighed materials in the graphene oxide mixed solution obtained in the step S1, and uniformly stirring to obtain the graphene oxide modified cement concrete of any one of claims 1 to 6.
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