CN109809749B - Construction method of graphene cement-based composite material - Google Patents
Construction method of graphene cement-based composite material Download PDFInfo
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- CN109809749B CN109809749B CN201910260782.5A CN201910260782A CN109809749B CN 109809749 B CN109809749 B CN 109809749B CN 201910260782 A CN201910260782 A CN 201910260782A CN 109809749 B CN109809749 B CN 109809749B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 185
- 239000004568 cement Substances 0.000 title claims abstract description 184
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 177
- 239000002131 composite material Substances 0.000 title claims abstract description 98
- 238000010276 construction Methods 0.000 title claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 91
- 239000002002 slurry Substances 0.000 claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 238000002156 mixing Methods 0.000 claims abstract description 59
- 239000000945 filler Substances 0.000 claims abstract description 48
- 238000003756 stirring Methods 0.000 claims abstract description 37
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 36
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- 241001553178 Arachis glabrata Species 0.000 claims description 59
- 235000010777 Arachis hypogaea Nutrition 0.000 claims description 59
- 235000018262 Arachis monticola Nutrition 0.000 claims description 59
- 235000020232 peanut Nutrition 0.000 claims description 59
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 24
- 238000000197 pyrolysis Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 17
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 13
- 239000000654 additive Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 229910002804 graphite Inorganic materials 0.000 claims description 8
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- 230000009286 beneficial effect Effects 0.000 abstract description 3
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- 239000000047 product Substances 0.000 description 13
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a construction method of a graphene cement-based composite material. The construction method may include the steps of: mixing the components in a mass ratio of 1: mixing and grinding 0.01-1% of cement and graphene materials to obtain a graphene cement dispersing material; mixing the components in a mass ratio of 1: 0.3-0.5: 0.001-0.02: 2-5, mixing and uniformly stirring the graphene cement dispersing material, water, an auxiliary agent and a filler to obtain a composite slurry, wherein cement can be added in the process of preparing the composite slurry; and injecting the composite slurry into a mold, and maintaining to form the graphene cement-based composite material. The beneficial effects of the invention include: can ensure that all components of the graphene cement composite material are uniformly mixed; the difficulty of site construction can be reduced, and the construction efficiency of workers can be improved; the equipment and the operation and maintenance cost thereof can be effectively reduced, thereby reducing the cost.
Description
Technical Field
The invention relates to the field of cement-based composite materials, in particular to a construction method of a graphene cement-based composite material.
Background
The cement-based composite material is widely used in the construction industry, and has very important significance in researching and improving the performance of the cement-based composite material. Researches show that the graphene material added into the cement-based composite material can improve various performances of the original material, for example, the compressive property can be improved to 25%, the fracture resistance is improved to nearly 20%, and the like. However, in the practical application of the graphene material to the cement composite material, the construction is troublesome and the graphene material and the cement composite material are not easy to be uniformly mixed, so that the final performance of the cement composite material is not obviously improved by the graphene material. The graphene material may even play an opposite role in the cement if not uniformly dispersed.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, an object of the present invention is to provide a method for constructing a graphene-based cement-based composite material, which can reduce construction cost while ensuring construction quality.
In order to achieve the above object, an aspect of the present invention provides a method for constructing a graphene-based cement-based composite material. The construction method comprises the following steps: mixing the components in a mass ratio of 1: mixing and grinding 0.01-1% of cement and graphene materials to obtain a graphene cement dispersing material; mixing the components in a mass ratio of 1: 0.3-0.5: 0.001-0.02: 2-5, mixing and uniformly stirring the graphene cement dispersing material, water, an auxiliary agent and a filler to obtain a composite slurry; and curing the composite slurry to form the graphene cement-based composite material.
According to an exemplary embodiment of the present invention, the step of obtaining the composite slurry may include: mixing and uniformly stirring the graphene cement dispersing material and water to obtain cement slurry; and mixing and uniformly stirring the cement slurry, the auxiliary agent and the filler to obtain the composite slurry.
According to an exemplary embodiment of the present invention, the water comprises a first body of water and a second body of water, the auxiliary agents comprise a first auxiliary agent and a second auxiliary agent, the filler comprises a first filler and a second filler, and the step of obtaining the composite slurry may comprise: mixing and uniformly stirring at least one of a first auxiliary agent and a first filler with the graphene cement dispersing material and a first water body to obtain cement slurry; and mixing at least one of a second auxiliary agent, a second filler and a second water body with the cement slurry, and uniformly stirring to obtain the composite slurry.
The invention also provides a construction method of the graphene cement-based composite material. The construction method may include the steps of: mixing the components in a mass ratio of 1: mixing and grinding 0.01-1 parts of first cement and a graphene material to obtain a graphene cement dispersing material; mixing the graphene cement dispersing material, water, an auxiliary agent, a filler and second cement, and uniformly stirring to obtain a composite slurry; and curing the composite slurry to form the graphene cement-based composite material.
According to an exemplary embodiment of the present invention, the water may include a first body of water and a second body of water, the auxiliary agents include a first auxiliary agent and a second auxiliary agent, the filler may include a first filler and a second filler, and the step of obtaining the composite slurry may include: mixing and uniformly stirring at least one of a first auxiliary agent and a first filler with the graphene cement dispersing material and a first water body to obtain cement slurry; and mixing and uniformly stirring at least one of a second auxiliary agent, a second filler and a second water body with the cement slurry and second cement to obtain the composite slurry.
According to an exemplary embodiment of the present invention, the graphene-based material may include at least one of expanded graphite, graphene oxide, and graphene.
According to an exemplary embodiment of the present invention, the graphene includes peanut shell graphene, and the moisture content of the peanut shell graphene may be below 1%, and may even be below 0.1%.
According to an exemplary embodiment of the invention, the peanut shell cement may comprise graphene prepared according to the following method: mixing the components in a mass ratio of 1: 0.5-2: 0.5-2 parts of peanut shell powder, potassium hydroxide and water are uniformly mixed and then dried to obtain a dried product; carrying out high-temperature pyrolysis on the dried product to obtain a pyrolysis product; and (3) placing the pyrolysis product in a sulfuric acid solution, carrying out ultrasonic treatment, and then filtering and drying to obtain the peanut shell graphene.
According to an exemplary embodiment of the present invention, the particle size of the graphene-based cement dispersion material may be 1 to 50 μm, for example, 30 ± 10 μm.
According to an exemplary embodiment of the present invention, the method may further comprise the steps of: before curing, the composite slurry is injected into a mold and oscillated to compact the cement slurry in the mold and eliminate air bubbles.
Compared with the prior art, the beneficial effects of the invention can include: can ensure that all components of the graphene cement composite material are uniformly mixed; the comprehensive performance of the graphene material on the composite material can be improved; the difficulty of site construction can be reduced, and the construction efficiency of workers can be improved; the equipment and the operation and maintenance cost thereof can be effectively reduced, thereby reducing the cost.
Detailed Description
Hereinafter, the construction method of the graphene-based cement-based composite material of the present invention will be described in detail with reference to exemplary embodiments. The first and second of the invention are only used for distinguishing each other, and do not represent the sequence.
The invention provides a construction method of a graphene cement-based composite material, which is used for improving the dispersibility of a graphene material in the cement composite material so as to effectively improve the performance of the graphene cement composite material; meanwhile, the construction method of the invention can also simplify the dispersion steps in the construction process, thereby improving the construction efficiency and reducing the cost.
In an exemplary embodiment of the present invention, the construction method may include the steps of:
s01: mixing and grinding the cement and the graphene materials to obtain the graphene cement dispersing material. The step can uniformly disperse the graphene materials in the cement particles, the graphene materials can help to promote the grain size refinement of the cement particles, and both the graphene materials and the cement particles can improve the final performance of the composite material. Wherein the particle size of the graphene-based cement dispersing material is 0.001 to 50 μm. The amount of the graphene-based material may be 0.01 to 1 by weight based on the cement. The water content of the graphene-based material may be 1% or less, and further, may be one in a thousand or less, which facilitates grinding. The graphene-based material may include at least one of expanded graphite, graphene oxide, and graphene. The expanded graphite may include pre-treated expanded graphite and non-pre-treated expanded graphite. The graphene oxide may include untreated graphene oxide and pretreated graphene oxide. The pretreatment may include various treatments, such as sulfonation, nitridation, etc., which are intended to increase or change the number and types of functional groups on the surface of the material, such as introduction of sulfur-containing functional groups on the surface of graphene oxide after sulfonation, etc., which may promote hydration and crystallization of cement to improve the overall performance of the composite material.
S02: and mixing and uniformly stirring the graphene cement dispersing material, water, the auxiliary agent and the filler to obtain the composite slurry. Wherein, the mass ratio of the graphene cement dispersing material to the water to the auxiliary agent to the filler is 1: 30% -50%: 0.1% -2%: 200 to 500 percent. Wherein, the addition amount of water has great influence on the performance of the cement composite material, and excessive water, for example, more than 50 percent of the mass of the cement, can cause the performance of the cement composite material to be reduced; too low water can result in too viscous a slurry, which is not conducive to uniform mixing of the materials, etc. The addition amount of the auxiliary agent is generally less, the less the addition amount is better, and the excessive addition not only increases the cost but also reduces the performance of the composite material; the addition of fillers should be controlled within a reasonable range, too low resulting in the use of large amounts of cement, and too high possibly resulting in unsatisfactory performance. In the process of preparing the composite slurry, cement can be added, the adding amount of the cement can be 50-500 wt% (based on the graphene cement dispersing material), for example, the adding amount of the cement is 1-2 times of that of the graphene cement dispersing material. The auxiliary agent may include at least one of a dispersant, a water reducing agent and a foaming agent, and the filler may include at least one of sand, slag and standard sand.
S03: and curing the composite slurry to form the graphene cement-based composite material, namely curing to obtain the graphene cement-based composite material. The composite slurry can also be directly poured into a place needing forming, such as a mine. Further, the composite slurry may be injected into the mold before curing and then vibrated to compact the cement slurry in the mold and eliminate air bubbles. Wherein, the curing can be carried out in a curing box with constant temperature and humidity, for example, the temperature can be 20-25 ℃, and the humidity can be 95-99%.
In this embodiment, step S01 may be performed at a construction site or may be performed at a non-construction site (e.g., a production shop), that is, prepared in advance. Preferably, the method can be prepared in advance, so that the construction steps of a construction site can be simplified, the construction time can be shortened, the construction efficiency can be improved, the use and maintenance of equipment of the construction site can be reduced, and the cost can be reduced.
In this embodiment, in the case that cement is not added in the process of preparing the composite slurry, the step S02 may include the following cases:
(1) and (4) directly mixing the raw materials in the step S02, and uniformly stirring to obtain the composite slurry. The step can be carried out on the construction site or in other places; preferably, the method is carried out on a construction site, so that the transportation cost of the composite slurry can be saved.
(2) The first step is as follows: firstly, mixing the graphene cement dispersing material and water, and uniformly stirring to obtain the cement slurry. The second step is that: and mixing and uniformly stirring the cement slurry, the auxiliary agent and the filler to obtain the composite slurry. Preferably, the second step is performed at the construction site to save costs.
(3) The first step is as follows: and mixing and uniformly stirring at least one of a first auxiliary agent and a first filler with the graphene cement dispersing material and the first water body to obtain the cement slurry. The second step is that: and mixing at least one of the second auxiliary agent, the second filler and the second water body with the cement slurry and uniformly stirring to obtain the composite slurry. The first and second additives are only used for distinguishing one another and do not show the sequence, the first and second additives comprise at least one of a dispersant, a water reducing agent and a foaming agent, and the first and second fillers can comprise at least one of sand and slag.
In the cases (2) and (3), the second step may be preferably performed at a construction site to save costs.
In this embodiment, in the case that cement is further added in the process of preparing the composite slurry, the step S02 may include the following cases:
(1) and (4) directly mixing the raw materials in the step S02, and uniformly stirring to obtain the composite slurry. The step can be carried out on the construction site or in other places; preferably, the method is carried out on a construction site, so that the transportation cost of the composite slurry can be saved.
(2) The first step is as follows: firstly, mixing the graphene cement dispersing material and water, and uniformly stirring to obtain the cement slurry. The second step is that: and then mixing and uniformly stirring the cement slurry, the auxiliary agent, the filler and the cement to obtain the composite slurry. Preferably, the second step is performed at the construction site to save costs.
(3) The first step is as follows: and mixing and uniformly stirring at least one of a first auxiliary agent and a first filler with the graphene cement dispersing material and the first water body to obtain the cement slurry. The second step is that: and mixing and uniformly stirring at least one of the second auxiliary agent, the second filler and the second water body with the cement slurry and the cement to obtain the composite slurry. For example, the auxiliary agent, the filler, the water body and the graphene cement dispersant can be mixed and uniformly stirred to obtain cement slurry; and then mixing and uniformly stirring the cement slurry, the filler and the cement to obtain the composite slurry. The first and second additives are only used for distinguishing one another and do not show the sequence, the first and second additives comprise at least one of a dispersing agent, a water reducing agent and a foaming agent, and the first and second fillers can comprise at least one of sand, slag and standard sand.
The second step in case (2) and (3) can be carried out at the construction site to save costs, such as the transportation costs of cement.
Further, when the composite slurry is prepared, cement can be added (a part of cement is added on site, so that the cost (grinding, transportation and the like) can be greatly saved).
In this embodiment, the graphene-based material may include peanut shell graphene. In the process of preparing the graphene cement dispersing material, the particle size of cement particles can be refined, the peanut shell graphene can be dispersed more uniformly, and the composite material can be effectively promoted to form a complex with more compact interior and more uniform surface and finer cracks in the hydration crystallization process (namely the maintenance process), so that the comprehensive mechanical property, the durability and the like of the composite material are improved, and the service life of the composite material can be prolonged.
The preparation method of the peanut shell graphene can comprise the following steps:
mixing the components in a mass ratio of 1: 0.5-2: 0.5-2 parts of peanut shell powder, potassium hydroxide and water are uniformly mixed, and then drying is carried out to obtain a dried product. Wherein, the blending can be realized by stirring. The peanut shell powder is prepared by cleaning peanut shell, drying, and pulverizing into powder; the peanut shell powder can pass through a 100-mesh sieve, and the water content can be not higher than 1%, such as 0.5 +/-0.2%; the lower the moisture content of the peanut shell powder, the better the effect, but the cost increases accordingly. The raw materials are uniformly mixed according to the mass ratio, the potassium hydroxide can be fully utilized in the ratio, the conversion of the peanut shell material (namely the peanut shell is converted into the graphene) can be well promoted, and the water consumption in the ratio can be enough to ensure that the other raw materials and the graphene are mixed. Drying can evaporate excess water and promote potassium hydroxide to permeate into the peanut shells; the drying can be carried out at 110-150 ℃, the uniform mixing effect of the potassium hydroxide and the peanut shells can be ensured within the range, and the drying time can be 0.5-5 h even if the potassium hydroxide fully permeates into the peanut shells.
And carrying out high-temperature pyrolysis on the dried product to obtain a pyrolysis product. The pyrolysis products may include carbonaceous organic matter and some impurities within the peanut shells. The atmosphere environment of the high-temperature pyrolysis can be an inert atmosphere, which can prevent the peanut shells from being oxidized by contacting air at a high temperature, thereby resulting in reduction of the yield of the graphene. The step of high temperature pyrolysis may include: heating the dried product to 800-1000 ℃ at a heating rate of 5-20 ℃/min, and preserving heat for 2-5 h; wherein, the temperature rise time can be determined according to the heat preservation temperature and the temperature rise rate.
And (3) placing the pyrolysis product in a sulfuric acid solution, carrying out ultrasonic treatment, and then filtering and drying to obtain the peanut shell graphene. Wherein, the drying can ensure that the water content of the graphene in the peanut shells is not higher than 1 percent, thereby being beneficial to the mixing and grinding in the next step. The concentration of the sulfuric acid solution can be 1-3 mol/L, and the ratio of the pyrolysis product to the sulfuric acid solution can be 1-100 g/L. The ultrasonic frequency of the ultrasonic treatment can be 40-80 Hz, and the time can be 1-2 h. Between filtering and drying, the filtered product can be washed to remove the excessive sulfuric acid and other impurities in the peanut shell graphene.
Compared with the traditional graphene, the raw material of the peanut shell graphene has the advantages of wide source, simple manufacturing process, environmental friendliness and the like. The peanut shell graphene is added into the cement material as a grinding aid, so that the particle size of the cement can be thinned, the dispersibility of the peanut shell graphene in the cement can be improved, and the excellent self-performance (such as high tensile strength, promotion of uniform crystallization of the cement and the like) of the graphene material can be fully utilized, so that the comprehensive performance of the cement-based composite product is improved.
In the present example, in the case of using peanut shell graphene as the graphene-based material,
step S01 may be: mixing and grinding the peanut shell graphene and cement to obtain the peanut shell graphene cement (namely the graphene cement dispersing material). For example, dried peanut shell graphene and cement can be taken and placed in a grinder and ground for a period of time to prepare peanut shell graphene cement. The particle size of the ground cement (namely the cement without the peanut shell graphene) is 10-120 mu m; the particle size of the peanut shell graphene cement can be 1-40 microns, such as 20 +/-5 microns, in the step, the particle size of the cement particles can be thinned, and the peanut shell graphene can be dispersed more uniformly. The mass of the peanut shell graphene can be 0.01-20% of that of cement, so that the cement has a good particle size, and the graphene has a good dispersion effect in the cement. However, when the quality of the peanut shells is higher than 20% of the cement quality, the cost is significantly increased and the effect is not necessarily good. The grinding mode can comprise roll-in grinding or ball milling, when the ball milling is adopted, the rotating speed is 100-1200 r/min, the time is 0.5-10 h, and the material ratio is 1: 1-8, wherein the material ratio refers to the mass ratio of the ball milling beads to the cement material added into the ball milling tank.
Step S02 is: and (2) uniformly mixing the peanut shell graphene cement, water, an auxiliary agent and a filler to obtain a composite slurry, or uniformly mixing the peanut shell graphene cement, the water and the filler to obtain the peanut shell graphene cement-based composite slurry. Further, the peanut shell graphene cement, water and the auxiliary agent can be uniformly mixed, or the peanut shell graphene cement and the water are uniformly mixed, then the filler is added, and the mixture is uniformly stirred to obtain the peanut shell graphene cement-based composite slurry. Wherein, the blending can be realized by stirring. The mass ratio of the peanut shell graphene cement to the water to the auxiliary agent can be 1: 0.4-0.5: 0.01 to 0.02, further, 1: 0.42 to 0.47: 0.01 to 0.015; or the mass ratio of the peanut shell graphene cement to the water can be 1: 0.42 to 0.47. The addition amount of the filler can be 200 wt% -400 wt% (based on cement), and the stirring time can be 0.5-20 h.
In still another exemplary embodiment of the present invention, the method of constructing the graphene-based cement-based composite material may include the steps of:
(1) preparing the graphene cement dispersing material with high graphene content (completed in early production or construction workshop): weighing 1: 0.01-1 of cement material powder and dry graphene material (wherein the graphene material can be one or more of dry graphene oxide material, pretreated graphene oxide material, graphene, pretreated expanded graphite and the like), and then mixing, grinding and dispersing (wherein the grinding can be one or more of ball milling and roll milling), so as to prepare the graphene cement dispersing material.
(2) Preparing graphene cement slurry: the graphene cement is mixed with one or more of water, other additives (one or more of dispersing agent, water reducing agent, foaming agent and the like) and filler (sand, slag and the like) and then ground or uniformly stirred, wherein the raw materials can be uniformly mixed through grinding.
(3) Preparing the graphene cement composite material (the step is generally carried out on a construction site): and (3) stirring and mixing the slurry obtained in the last step or the powder obtained in the first step and one or more of cement, water, other additives (dispersing agent, water reducing agent, foaming agent and the like) and fillers (sand, slag and the like) required to be added in a construction site, directly injecting into a mold, and oscillating, curing and molding.
In order that the above-described exemplary embodiments of the invention may be better understood, further description thereof with reference to specific examples is provided below.
Example 1
Weighing 500 parts by weight: 50 parts by weight (1: 0.1) of a cement material powder and a dry graphene oxide material were placed in a ball mill pot and dispersed by ball milling. For example, the ball milling speed is 300r/min, the time is 2.5h, and the material ratio is 1: 8. and preparing the graphene cement dispersing material with high graphene content.
After the graphene cement dispersion material is transported to a construction site, 50 parts by weight of a sample is weighed, and then the sample is uniformly stirred and mixed with 400 parts by weight of cement, 225 parts by weight of water, 2 parts by weight of a dispersing agent, 2 parts by weight of a foaming agent, 1350 parts by weight of sand stones and the like in the construction site, and then the mixture is directly injected into a mold for vibration curing and molding.
Example 2
Weighing 1000 parts by weight: 50 parts by weight (1: 0.05) of cement material powder and a dry graphene oxide material, and then placing the mixture into a ball milling tank for ball milling and dispersing to obtain the graphene cement dispersing material with high graphene content. Wherein the ball milling speed is 400r/min, the time is 2.0h, and the material ratio is 1: 6.
and mixing 1050 parts by weight of the graphene cement dispersing material with 100 parts by weight of water, 2.0 parts by weight of dispersing agent and 2.0 parts by weight of water reducing agent, and grinding or uniformly stirring to prepare the graphene cement slurry.
And (2) after the graphene cement slurry is transported to a construction site, weighing 230 parts by weight of the graphene cement slurry, uniformly stirring and mixing with 800 parts by weight of cement, 200 parts by weight of water, 2 parts by weight of defoaming agent, 1350 parts by weight of slag and the like in the construction site, directly injecting into a site mold, and carrying out oscillation curing and molding.
Example 3
Weighing 0.3 wt% of dried peanut shell graphene (namely the mass of the dried peanut shell graphene is 0.3% of that of the cement material) and 500 parts of the cement material, placing the mixture in a ball mill, and performing ball milling (the rotating speed is 300r/min, the time is 1.5h, and the material ratio is 1: 8) to prepare the peanut shell graphene cement sample.
Weighing 450 parts by weight of the peanut shell graphene cement sample, adding 225 parts by weight of water and 5 parts by weight of defoaming agent, stirring for 0.5h, adding 1350 parts by weight of standard sand, continuously stirring for 0.5h, finally injecting into a mold, oscillating for 10min, placing into a standard curing box (the temperature is about 20 ℃, and the humidity is more than 99%), curing and molding for 24h, and then removing the mold to obtain the composite material.
In summary, the advantages of the construction method of the graphene cement-based composite material of the present invention may include:
(1) the method grinds the graphene materials and the cement materials firstly, so that the graphene materials can be uniformly dispersed in the cement particles, and the graphene materials can also help to promote the particle size refinement of the cement particles so as to improve the final performance of the composite material after construction.
(2) The method can ensure that all components of the graphene cement-based composite material are uniformly mixed (such as in the process of preparing the graphene cement dispersing material), and can effectively avoid the problem caused by the fact that all components are not easily uniformly mixed in site construction.
(3) The invention can ensure that the comprehensive performance of the composite material is improved by the graphene material.
(4) The invention can be prepared into slurry or powder (namely, the graphene cement dispersing material) firstly and then transported to the site for construction, thereby reducing the difficulty of site construction, improving the construction efficiency of workers, ensuring the construction quality, and simultaneously effectively reducing the equipment and the operation and maintenance cost thereof, thereby reducing the cost.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The construction method of the graphene cement-based composite material is characterized by comprising the following steps of:
mixing the components in a mass ratio of 1: mixing and grinding 0.01-1% of cement and graphene materials to obtain a graphene cement dispersing material;
mixing the components in a mass ratio of 1: 0.3-0.5: 0.001-0.02: 2-5, mixing and uniformly stirring the graphene cement dispersing material, water, an auxiliary agent and a filler to obtain a composite slurry;
maintaining the composite slurry to form the graphene cement-based composite material;
the graphene material comprises at least one of expanded graphite, graphene oxide and peanut shell graphene, wherein the peanut shell graphene is an essential component;
the peanut shell graphene comprises graphene prepared by the following method:
mixing the components in a mass ratio of 1: 0.5-2: 0.5-2 parts of peanut shell powder, potassium hydroxide and water are uniformly mixed and then dried to obtain a dried product;
carrying out high-temperature pyrolysis on the dried product to obtain a pyrolysis product;
putting the pyrolysis product into a sulfuric acid solution, carrying out ultrasonic treatment, and then filtering and drying to obtain peanut shell graphene;
the high-temperature pyrolysis step comprises: and heating the dried product to 800-1000 ℃ at a temperature rise speed of 5-20 ℃/min, and preserving heat for 2-5 h.
2. The method of constructing a graphene-based cement-based composite material according to claim 1, wherein the step of obtaining the composite slurry comprises:
mixing and uniformly stirring the graphene cement dispersing material and water to obtain cement slurry;
and mixing and uniformly stirring the cement slurry, the auxiliary agent and the filler to obtain the composite slurry.
3. The method of constructing a graphene-based cement-based composite material according to claim 1, wherein the water includes a first water body and a second water body, the additives include a first additive and a second additive, the filler includes a first filler and a second filler, and the step of obtaining the composite slurry includes:
mixing a first auxiliary agent, a first filler, the graphene cement dispersing material and a first water body, and uniformly stirring to obtain cement slurry;
and mixing and uniformly stirring the second auxiliary agent, the second filler, the second water body and the cement slurry to obtain the composite slurry.
4. The construction method of the graphene cement-based composite material is characterized by comprising the following steps of:
mixing the components in a mass ratio of 1: mixing and grinding 0.01-1 parts of first cement and a graphene material to obtain a graphene cement dispersing material;
mixing the graphene cement dispersing material, water, an auxiliary agent, a filler and second cement, and uniformly stirring to obtain a composite slurry; wherein the mass ratio of the graphene cement dispersing material to the water to the auxiliary agent to the filler is 1: 0.3-0.5: 0.001-0.02: 2-5, wherein the addition amount of the second cement is 50-500% of the mass of the graphene cement dispersing material;
maintaining the composite slurry to form the graphene cement-based composite material;
the graphene material comprises at least one of expanded graphite, graphene oxide and peanut shell graphene, wherein the peanut shell graphene is an essential component;
the peanut shell graphene comprises graphene prepared by the following method:
mixing the components in a mass ratio of 1: 0.5-2: 0.5-2 parts of peanut shell powder, potassium hydroxide and water are uniformly mixed and then dried to obtain a dried product;
carrying out high-temperature pyrolysis on the dried product to obtain a pyrolysis product;
putting the pyrolysis product into a sulfuric acid solution, carrying out ultrasonic treatment, and then filtering and drying to obtain peanut shell graphene;
the high-temperature pyrolysis step comprises: and heating the dried product to 800-1000 ℃ at a temperature rise speed of 5-20 ℃/min, and preserving heat for 2-5 h.
5. The method of constructing a graphene-based cement-based composite material according to claim 4, wherein the water includes a first water body and a second water body, the additives include a first additive and a second additive, the filler includes a first filler and a second filler, and the step of obtaining the composite slurry includes:
mixing a first auxiliary agent, a first filler, the graphene cement dispersing material and a first water body, and uniformly stirring to obtain cement slurry;
and mixing and uniformly stirring the second auxiliary agent, the second filler, the second water body, the cement slurry and the second cement to obtain the composite slurry.
6. The method of constructing a graphene-based cement-based composite material according to claim 1 or 4, wherein the water content of the peanut shell graphene is 1% or less.
7. The method of constructing a graphene-based cement-based composite material according to claim 6, wherein the particle size of the graphene-based cement dispersing material is 1 to 50 μm.
8. The method of constructing a graphene-based cement-based composite material according to claim 1 or 4, wherein the method further comprises the steps of: before curing, the composite slurry is injected into a mold and oscillated to tamp the composite slurry in the mold and eliminate air bubbles.
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