CN116217189A - Graphene oxide modified low-whiskering low-carbon gelling material and preparation method thereof - Google Patents
Graphene oxide modified low-whiskering low-carbon gelling material and preparation method thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 239000000463 material Substances 0.000 title claims abstract description 95
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 92
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title abstract description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 60
- 239000000843 powder Substances 0.000 claims abstract description 38
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 36
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 36
- 239000011707 mineral Substances 0.000 claims abstract description 36
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 22
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- 239000002994 raw material Substances 0.000 claims abstract description 12
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- 238000002156 mixing Methods 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
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- 239000003513 alkali Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
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- 229910001424 calcium ion Inorganic materials 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 102000004310 Ion Channels Human genes 0.000 description 4
- 125000000524 functional group Chemical group 0.000 description 4
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- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 2
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- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
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- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
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- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention belongs to the technical field of low-carbon gel materials, and particularly relates to a graphene oxide modified low-alkali-efflorescence low-carbon gel material and a preparation method thereof. The low-alkali-efflorescence low-carbon gel material consists of the following raw materials in parts by weight: 180-250 parts of fly ash, 180-250 parts of mineral powder, 80-150 parts of liquid sodium silicate, 15-30 parts of sodium hydroxide, 130-180 parts of water, 1000-1500 parts of sand, 10-15 parts of graphene oxide and 1-5 parts of silane coupling agent; meanwhile, the invention provides a specific preparation method. According to the invention, the graphene oxide is modified by the silane coupling agent, and the modified graphene oxide is grafted to the surface of mineral powder and is matched with other components, so that the problems of serious whiskering and poor mechanical properties of the low-carbon gelling material are solved.
Description
Technical Field
The invention belongs to the technical field of low-carbon gel materials, and particularly relates to a graphene oxide modified low-alkali-efflorescence low-carbon gel material and a preparation method thereof.
Background
The low-carbon gel material is a gel product which is formed by polymerizing a silicon oxygen tetrahedron and an aluminum oxygen tetrahedron and has a basic structure of a hydration product, wherein the silicon oxygen tetrahedron is excited by an alkali-exciting agent to excite a silicon aluminum raw material, and the novel inorganic nonmetallic material is obtained through a series of chemical reactions such as dissolution, depolymerization, polycondensation and the like. The low-carbon gel material has the advantages of low energy consumption, low pollution, waste recycling and the like.
However, since the performance of the low-carbon gel material is seriously dependent on the excitation effect of the strong alkaline substance on the solid waste, the activity of the solid waste is generally low, so that the performance of the prepared low-carbon gel material is often poor. In order to improve the performance of the material, more strong alkaline substances are often required to be doped in the preparation process, so that the content of the saline-alkali in the material is high, and the material is more prone to severe alkali efflorescence. The phenomenon of whiskering is CO in the air 2 A phenomenon of generating white precipitate due to reaction with OH-ions in the sample, especially when moisture migrates from the inside of the sample to the surface, is more likely to occur, and the low carbon gel material is prepared without separating the alkali solution, so that it is more likely to be salted out. The whiskering not only affects the appearance of the repair/protection material, but also has a great significance for inhibiting whiskering of the low-carbon gelling material because of favorable conditions for external ions to invade the interior of the repair/protection material and cause structural damage.
In addition, the mechanical strength of the low-carbon gel material is low. At present, the mechanical strength of the prepared low-carbon gel material is not high due to the poor activity of other solid wastes except slag. The existing treatment measures have the improvement effect, but the cost is often higher, so thatMore economical and convenient treatment measures are sought. Graphene oxide has very excellent mechanical properties (tensile strength>130MPa, modulus of elasticity>32 GPa) and an ultra-large specific surface area (about 2600m 2 /g), which makes it of great potential in improving the toughness of low carbon gelling materials, but this also leads to its complexation with calcium ions leading to agglomeration, reducing its effectiveness.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the graphene oxide modified low-alkali-efflorescence low-carbon gel material and the preparation method thereof.
On the one hand, the invention provides a graphene oxide modified low-alkali-efflorescence low-carbon gel material which is prepared from the following raw materials in parts by weight: 180-250 parts of fly ash, 180-250 parts of mineral powder, 80-150 parts of liquid sodium silicate, 15-30 parts of sodium hydroxide, 130-180 parts of water, 1000-1500 parts of sand, 10-15 parts of graphene oxide and 1-5 parts of silane coupling agent.
According to the scheme, the raw materials comprise, by weight, 250 parts of fly ash, 250 parts of mineral powder, 150 parts of liquid sodium silicate, 30 parts of sodium hydroxide, 180 parts of water, 1500 parts of sand, 15 parts of graphene oxide and 5 parts of a silane coupling agent.
According to a further improvement of the scheme, the fly ash is class-C secondary fly ash and is used as a precursor material of aluminosilicate.
Further improvement of the scheme, the specific surface area of the mineral powder is 400m 2 /Kg。
Further improvements of the scheme, the liquid sodium silicate with the content of 99 percent is used as an exciting agent.
Further improvements in this embodiment provide graphene oxide having an average size of about 4 microns, preferably 4 mm.
Further refinements of this scheme, the silane coupling agent is one or more of KH440 or KH 560.
On the other hand, the invention provides a preparation method for producing the graphene oxide modified low-alkali-efflorescence low-carbon gel material, which comprises the following steps:
(1) Modifying graphene oxide, mixing the graphene oxide with a silane coupling agent, and stirring in a water bath to obtain graphene oxide with the surface loaded with the silane coupling agent;
(2) Adding the modified graphene oxide into water, mixing, adding mineral powder, stirring for half an hour to enable the graphene oxide with the surface loaded with the silane coupling agent obtained in the step (1) to be grafted onto the surface of the mineral powder, and finally sequentially adding fly ash, liquid sodium silicate, sodium hydroxide and sand, and stirring to obtain polymer slurry;
(3) And (3) forming, curing and demolding the polymer slurry obtained in the step (2) to obtain a low-carbon gel material blank, and curing to obtain the low-carbon gel material.
According to a further improvement of the scheme, the preparation method of the graphene oxide modified low-alkali-efflorescence low-carbon gel material comprises the following steps of:
(1) Modifying graphene oxide, mixing 10-15 parts of graphene oxide with 1-5 parts of silane coupling agent, and stirring in a water bath at 70-90 ℃ for 12-24 hours to obtain graphene oxide with the surface loaded with the silane coupling agent;
(2) Adding the modified graphene oxide into 130-180 parts of water, mixing, adding 180-250 parts of mineral powder, and stirring for half an hour to enable the graphene oxide with the silane coupling agent loaded on the surface obtained in the step (1) to be grafted on the surface of the mineral powder; finally, 180-250 parts of fly ash, 80-150 parts of liquid sodium silicate, 15-30 parts of sodium hydroxide and 1000-1500 parts of sand are sequentially added and stirred for 5-10 minutes to obtain polymer slurry;
(3) Pouring the polymer slurry obtained in the step (2) into a mould, placing the mould on a vibrating table for forming, and curing and demoulding to obtain a low-carbon gel material blank; and (3) immediately placing the low-carbon gel material blank into a standard curing chamber with the temperature of 20 ℃ and the relative humidity of 95% for curing to obtain the low-carbon gel material.
The invention has the beneficial effects that:
(1) Traditional low carbon gelling materials are severely salted out. Because more saline-alkali excitant is needed to be doped in the preparation of the low-carbon gel material, the content of soluble saline-alkali in the material is higher, and the low-carbon gel material is more prone to severe whiskering. According to the invention, the graphene oxide is grafted to the surface of mineral powder through the silane coupling agent by taking the effect of the silane coupling agent as a bridge, so that the following effects are achieved: 1) The graphene oxide is used as a typical layered two-dimensional nano material, and the addition of the lamellar graphene oxide can obstruct hydroxide ion channels, so that the whiskering of the low-carbon gelling material is reduced; 2) The direct addition of graphene oxide to the material can cause these functional groups to complex with calcium ions contained in the material itself, thereby adversely affecting the material. The functional groups on the surface of the graphene oxide can be modified by using a silane coupling agent, so that the functional groups of the graphene oxide are combined with the silane coupling agent, so that the functional groups are prevented from being combined with calcium ions in the low-carbon gelling material, the problem of graphene oxide agglomeration caused by the calcium ions in the low-carbon gelling material is solved by loading the graphene oxide on the surface of mineral powder, and the dispersion of the graphene oxide is facilitated, and the effective rate of the graphene oxide is increased; 3) The graphene oxide is loaded on the surface of the mineral powder, so that the activity of the mineral powder can be increased, and the consumption of alkali can be reduced.
(2) The invention fully exerts the characteristics of excellent mechanical properties (tensile strength, elastic modulus and the like) and ultra-large specific surface area of the graphene oxide, and the graphene oxide is cooperated with the original material to greatly improve the toughness of the low-carbon gel material. The mechanical strength of the low-carbon gel material is increased by graphene oxide, the seven-day compressive strength (MPa) can reach 56.5MPa, the seven-day flexural strength (MPa) can reach 12MPa, and compared with the traditional low-carbon gel material, the mechanical strength of the low-carbon gel material is obviously improved.
(3) The excitation effect of the exciting agent is easily influenced by the environment, and the strong alkaline exciting agent for preparing the low-carbon gel material often presents water solubility, is easily dissolved out and lost in the test piece maintenance process, and influences the excitation effect on solid waste. It is therefore desirable to take appropriate treatment measures to inhibit or slow the loss of the activator. The graphene oxide is a two-dimensional lamellar material, and can effectively block capillary holes and ion channels, so that loss of an exciting agent is inhibited.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a scanning electron microscope image of a graphene oxide modified mineral powder in embodiment 2 of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The graphene oxide modified low-alkali-efflorescence low-carbon gel material and the preparation method thereof are described in detail below with reference to specific examples.
The specification and model of the raw materials of each example are as follows:
the fly ash accords with the technical index of class C secondary fly ash in GB/T1596-2005 fly ash used in cement and concrete.
The specific surface area of the mineral powder is 400m 2 The other technical indexes of the powder are all required to meet the technical indexes required by S75 grade of GB/T18046-2000 granulated blast furnace slag powder for cement and concrete.
Liquid sodium silicate purchased from An Quan chemical industry and the content is 99%. Sodium hydroxide was purchased from the national drug group.
Graphene oxide is purchased from element number six in Changzhou, and has an average size of about 4 microns.
The silane coupling agent is KH560, purchased from Nanjing Youpu chemical industry, and has a molecular formula of C 9 H 20 O 5 Si。
Blank examples:
the low-carbon gel material consists of the following raw materials in parts by weight: 200 parts of fly ash, 200 parts of mineral powder, 100 parts of liquid sodium silicate, 20 parts of sodium hydroxide, 150 parts of water and 1200 parts of sand.
(1) Adding mineral powder into water according to the proportion, stirring for half an hour, then sequentially adding fly ash, liquid sodium silicate, sodium hydroxide and sand, and stirring for 5 minutes to obtain polymer slurry.
(2) Pouring the polymer slurry into a prismatic mold with the thickness of 40mm multiplied by 160mm, placing the prismatic mold on a vibrating table for molding, curing for 24 hours in an environment with the temperature of 20+/-1 ℃, and demolding to obtain a low-carbon gel material blank; and (3) immediately placing the low-carbon gel material blank into a standard curing chamber with the temperature of 20 ℃ and the relative humidity of 95% for curing to obtain the low-carbon gel material.
Example 1:
the graphene oxide modified low-alkali-efflorescence low-carbon gel material consists of the following raw materials in parts by weight: 200 parts of fly ash, 200 parts of mineral powder, 100 parts of liquid sodium silicate, 20 parts of sodium hydroxide, 150 parts of water, 1200 parts of sand and 12 parts of graphene oxide.
The preparation method of the graphene oxide modified low-alkali-efflorescence low-carbon gel material comprises the following steps:
(1) Adding graphene oxide into water according to the proportion, mixing, adding mineral powder, stirring for half an hour, sequentially adding fly ash, liquid sodium silicate, sodium hydroxide and sand, and stirring for 5 minutes to obtain polymer slurry.
(2) Pouring the polymer slurry into a prismatic mold with the thickness of 40mm multiplied by 160mm, placing the prismatic mold on a vibrating table for molding, curing for 24 hours in an environment with the temperature of 20+/-1 ℃, and demolding to obtain a low-carbon gel material blank; and (3) immediately placing the low-carbon gel material blank into a standard curing chamber with the temperature of 20 ℃ and the relative humidity of 95% for curing to obtain the low-carbon gel material.
Example 2
The graphene oxide modified low-alkali-efflorescence low-carbon gel material consists of the following raw materials in parts by weight: 200 parts of fly ash, 200 parts of mineral powder, 100 parts of liquid sodium silicate, 20 parts of sodium hydroxide, 150 parts of water, 1200 parts of sand, 12 parts of graphene oxide and 3 parts of silane coupling agent.
The preparation method of the graphene oxide modified low-alkali-efflorescence low-carbon gel material comprises the following steps:
(1) And modifying graphene oxide, mixing 12 parts of graphene oxide with 3 parts of silane coupling agent, and stirring in a water bath at 80 ℃ for 12 hours to obtain the graphene oxide with the silane coupling agent loaded on the surface.
(2) And (3) adding the graphene oxide modified in the step (1) into 150 parts of water, mixing, adding mineral powder 200, and stirring for half an hour to enable the modified graphene oxide to be grafted on the surface of the mineral powder, wherein a scanning electron microscope image is shown in the attached figure 1. Finally, 200 parts of fly ash, 100 parts of liquid sodium silicate, 20 parts of sodium hydroxide and 1200 parts of sand are sequentially added and stirred for 5 minutes to obtain polymer slurry.
(3) Pouring the polymer slurry into a prismatic mold with the thickness of 40mm multiplied by 160mm, placing the prismatic mold on a vibrating table for molding, curing for 24 hours in an environment with the temperature of 20+/-1 ℃, and demolding to obtain a low-carbon gel material blank; and (3) immediately placing the low-carbon gel material blank into a standard curing chamber with the temperature of 20 ℃ and the relative humidity of 95% for curing to obtain the low-carbon gel material.
Example 3
The graphene oxide modified low-alkali-efflorescence low-carbon gel material consists of the following raw materials in parts by weight: 180 parts of fly ash, 180 parts of mineral powder, 80 parts of liquid sodium silicate, 15 parts of sodium hydroxide, 130 parts of water, 1000 parts of sand, 10 parts of graphene oxide and 1 part of silane coupling agent.
The preparation method of the graphene oxide modified low-alkali-efflorescence low-carbon gel material comprises the following steps:
(1) And modifying graphene oxide, mixing 10 parts of graphene oxide with 1 part of silane coupling agent, and stirring in a water bath at 70 ℃ for 10 hours to obtain the graphene oxide with the silane coupling agent loaded on the surface.
(2) And (3) adding the graphene oxide modified in the step (1) into 130 parts of water, mixing, adding the mineral powder 180, and stirring for half an hour to enable the modified graphene oxide to be grafted on the surface of the mineral powder. Finally, 180 parts of fly ash, 80 parts of liquid sodium silicate, 15 parts of sodium hydroxide and 1000 parts of sand are sequentially added and stirred for 6 minutes to obtain polymer slurry.
(3) Pouring the polymer slurry into a prismatic mold with the thickness of 40mm multiplied by 160mm, placing the prismatic mold on a vibrating table for molding, curing for 24 hours in an environment with the temperature of 20+/-1 ℃, and demolding to obtain a low-carbon gel material blank; and (3) immediately placing the low-carbon gel material blank into a standard curing chamber with the temperature of 20 ℃ and the relative humidity of 95% for curing to obtain the low-carbon gel material.
Example 4
The graphene oxide modified low-alkali-efflorescence low-carbon gel material consists of the following raw materials in parts by weight: 250 parts of fly ash, 250 parts of mineral powder, 150 parts of liquid sodium silicate, 30 parts of sodium hydroxide, 180 parts of water, 1500 parts of sand, 15 parts of graphene oxide and 5 parts of silane coupling agent.
The preparation method of the graphene oxide modified low-alkali-efflorescence low-carbon gel material comprises the following steps:
(1) And modifying graphene oxide, mixing 15 parts of graphene oxide with 5 parts of silane coupling agent, and stirring in a water bath at 70 ℃ for 17 hours to obtain the graphene oxide with the silane coupling agent loaded on the surface.
(2) And (3) adding the graphene oxide modified in the step (1) into 180 parts of water, mixing, adding mineral powder 250, and stirring for half an hour to enable the modified graphene oxide to be grafted on the surface of the mineral powder. Finally, 250 parts of fly ash, 150 parts of liquid sodium silicate, 30 parts of sodium hydroxide and 1500 parts of sand are sequentially added and stirred for 7 minutes to obtain polymer slurry.
(3) Pouring the polymer slurry into a prismatic mold with the thickness of 40mm multiplied by 160mm, placing the prismatic mold on a vibrating table for molding, curing for 24 hours in an environment with the temperature of 20+/-1 ℃, and demolding to obtain a low-carbon gel material blank; and (3) immediately placing the low-carbon gel material blank into a standard curing chamber with the temperature of 20 ℃ and the relative humidity of 95% for curing to obtain the low-carbon gel material.
In addition, the effect of using KH560 instead of using KH440 and KH560 in a mass ratio of 1:1 for the silane coupling agent is similar to that of example 4, and will not be described in detail here.
Performance testing
The mechanical properties of the materials prepared in the examples at different ages were tested according to the cement mortar strength test method (GB/T17671-2021). Bending resistance: one side of the test body is placed on a supporting cylinder of the testing machine, the long axis of the test body is perpendicular to the supporting cylinder, and a load is uniformly and vertically applied on the opposite side of the prism at a speed of 50N/s through a loading cylinder until the test body is broken. Compression resistance: after the flexural strength test is completed, two half test pieces are taken out and subjected to a compressive strength test. The compressive strength test was performed on the side of the half prism of the universal tester. The difference between the center of the half prism and the compression center of the pressing plate of the pressing machine is within 0.5mm, and the part of the prism exposed outside the pressing plate is about 10mm. The whole loading process is uniformly loaded at 2400N/s until the damage is caused.
And (3) performing a flashing test: test pieces were first prepared, each weighing 300g. And after curing for 7d, taking the test piece out of the standard curing box, removing the preservative film on the surface of the test piece by the film-covered curing test piece, and removing foreign matters on the surface of the test piece by the test piece which is not subjected to film-covered treatment. And then placing the test pieces in clean plastic containers respectively, pouring 300mL of deionized water to completely submerge the test pieces, immediately sealing the containers to prevent foreign matters from falling into the containers, and soaking the test pieces for 5 days under natural conditions. And taking out the test piece after the test piece is soaked to a specified age, vertically suspending the test piece above the container, and naturally draining the test piece. The container was then placed in an oven (temperature 80 ℃) to accelerate drying until the soak had evaporated completely. Finally, the white sediment precipitated on the inner wall of the container is carefully collected and weighed by using a brush. The results are shown in the following table.
As can be seen from the table, compared with the blank example and the example 1, after graphene oxide is added, the mechanical strength (seven-day compressive strength and seven-day flexural strength) of the cementing material is obviously improved, so that the toughness of the cementing material is greatly improved by adding the graphene oxide; meanwhile, the amount of the whiskering after the graphene oxide is increased is reduced to a certain extent, and the whiskering of the low-carbon gelling material is reduced because the graphene oxide blocks hydroxide ion channels.
As can be seen by comparing the embodiment 2 with the embodiment 3-5, the mechanical strength and the whiskering amount of the cementing material are both obviously improved, which proves that the problem of agglomeration of the graphene oxide caused by calcium ions in the low-carbon cementing material is solved by grafting the graphene oxide onto the mineral powder surface through the silane coupling agent, and the effective rate of the graphene oxide is increased; in addition, graphene oxide is used as a two-dimensional lamellar material, and capillary holes and ion channels can be effectively blocked, so that loss of an exciting agent is inhibited, and the effect of the exciting agent is better played.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (9)
1. The graphene oxide modified low-alkali-efflorescence low-carbon gel material is characterized by comprising the following raw materials in parts by weight: 180-250 parts of fly ash, 180-250 parts of mineral powder, 80-150 parts of liquid sodium silicate, 15-30 parts of sodium hydroxide, 130-180 parts of water, 1000-1500 parts of sand, 10-15 parts of graphene oxide and 1-5 parts of silane coupling agent.
2. The graphene oxide modified low-alkali-build low-carbon gel material according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 250 parts of fly ash, 250 parts of mineral powder, 150 parts of liquid sodium silicate, 30 parts of sodium hydroxide, 180 parts of water, 1500 parts of sand, 15 parts of graphene oxide and 5 parts of silane coupling agent.
3. The graphene oxide modified low-alkali-build low-carbon gel material according to claim 1, wherein: the fly ash is class-C secondary fly ash.
4. The graphene oxide modified low-alkali-build low-carbon gel material according to claim 1, wherein: the specific surface area of the mineral powder is 400m 2 /Kg。
5. The graphene oxide modified low-alkali-build low-carbon gel material according to claim 1, wherein: the content of the liquid sodium silicate is 99%.
6. The graphene oxide modified low-alkali-build low-carbon gel material according to claim 1, wherein: the average size of the graphene oxide is 4 microns.
7. The graphene oxide modified low-alkali-build low-carbon gel material according to claim 1, wherein: the silane coupling agent is one or more of KH440 or KH 560.
8. The method for preparing the graphene oxide modified low-alkali-efflorescence low-carbon gel material according to claim 1, which is characterized by comprising the following steps:
(1) Modification of graphene oxide: mixing graphene oxide with a silane coupling agent, and stirring in a water bath to obtain graphene oxide with the surface loaded with the silane coupling agent;
(2) Adding the modified graphene oxide into water, mixing, adding mineral powder, stirring for half an hour to enable the graphene oxide with the surface loaded with the silane coupling agent obtained in the step (1) to be grafted onto the surface of the mineral powder, and finally sequentially adding fly ash, liquid sodium silicate, sodium hydroxide and sand, and stirring to obtain polymer slurry;
(3) And (3) forming, curing and demolding the polymer slurry obtained in the step (2) to obtain a low-carbon gel material blank, and curing to obtain the low-carbon gel material.
9. The method of manufacturing according to claim 8, wherein: the method comprises the following steps:
(1) Modifying graphene oxide, mixing 10-15 parts of graphene oxide with 1-5 parts of silane coupling agent, and stirring in a water bath at 70-90 ℃ for 12-24 hours to obtain graphene oxide with the surface loaded with the silane coupling agent;
(2) Adding the modified graphene oxide into 130-180 parts of water, mixing, adding 180-250 parts of mineral powder, and stirring for half an hour to enable the graphene oxide with the silane coupling agent loaded on the surface obtained in the step (1) to be grafted on the surface of the mineral powder; finally, 180-250 parts of fly ash, 80-150 parts of liquid sodium silicate, 15-30 parts of sodium hydroxide and 1000-1500 parts of sand are sequentially added and stirred for 5-10 minutes to obtain polymer slurry;
(3) Pouring the polymer slurry obtained in the step (2) into a mould, placing the mould on a vibrating table for forming, and curing and demoulding to obtain a low-carbon gel material blank; and (3) immediately placing the low-carbon gel material blank into a standard curing chamber with the temperature of 20 ℃ and the relative humidity of 95% for curing to obtain the low-carbon gel material.
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| CN116835943A (en) * | 2023-07-04 | 2023-10-03 | 武汉晴川学院 | Environment-friendly color-difference-free facing mortar and preparation method thereof |
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| CN111253119B (en) * | 2020-03-20 | 2021-03-02 | 盐城工学院 | Graphene oxide-silane coupling agent-geopolymer composite material and preparation method thereof |
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| CN116589261A (en) * | 2023-06-27 | 2023-08-15 | 山东高速材料技术开发集团有限公司 | Modified low-shrinkage low-carbon gel material utilizing red mud and preparation method thereof |
| CN116589261B (en) * | 2023-06-27 | 2024-01-26 | 山东高速材料技术开发集团有限公司 | Modified low-shrinkage low-carbon gel material utilizing red mud and preparation method thereof |
| CN116835943A (en) * | 2023-07-04 | 2023-10-03 | 武汉晴川学院 | Environment-friendly color-difference-free facing mortar and preparation method thereof |
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