CN112390578A - CNF reinforced steel slag-based geopolymer cementing material, forming body, preparation and application thereof - Google Patents
CNF reinforced steel slag-based geopolymer cementing material, forming body, preparation and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—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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- 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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention relates to a CNF reinforced steel slag-based geopolymer cementing material, a forming body, and preparation and application thereof, wherein the CNF reinforced steel slag-based geopolymer cementing material comprises the following components in parts by weight: 50-70 parts of steel slag; 5-7 parts of water glass; 0.8-1.2 parts of NaOH; 20-30 parts of water; the steel slag steel further comprises CNF, wherein the mass of the CNF is 0.1-0.5% of that of the steel slag. Compared with the prior art, the formed body prepared from the CNF reinforced steel slag-based geopolymer cementing material provided by the invention has better comprehensive mechanical properties, can better realize the application of the geopolymer material in the field of building engineering materials, provides a new direction for resource utilization of steel slag, and has good industrial prospects.
Description
Technical Field
The invention relates to the field of environment-friendly building materials, in particular to a CNF reinforced steel slag-based geopolymer cementing material, a forming body, a preparation method and application thereof.
Background
The steel slag is solid waste discharged in the crude steel smelting process of a steel plant, and mainly comprises calcium oxide, ferric oxide, silicon dioxide and aluminum oxide. Due to the rapid development of the steel industry and the low utilization rate of the steel slag, China has a large amount of stacked steel slag, which not only occupies valuable land, but also pollutes the environment. The geopolymer material is a novel green cementing material formed by taking minerals and solid wastes containing silicon-aluminum oxide compounds such as fly ash, kaolin, metallurgical slag, industrial waste residue and the like as raw materials and carrying out geopolymerization reaction through alkali liquid excitation.
Compared with silicate cement materials, the geopolymer has the advantages of wide raw material source, low production energy consumption, capability of realizing solid waste utilization, high strength, acid and alkali corrosion resistance, fire resistance and high temperature resistance. The steel slag is rich in silicon-aluminum minerals and has certain activity through a high-temperature calcination process, and if the steel slag can be used as a geopolymer raw material for solid waste utilization and can replace part of cement to be applied to the field of building engineering, great contribution must be made to the society of resource conservation and environmental friendliness. However, the steel slag has complex components and low activity, and the geopolymer prepared by alkali excitation has the defects of low strength, high brittleness and insufficient toughness.
Therefore, how to improve the mechanical property of the steel slag-based geopolymer material by toughening and reinforcing and highlighting the environmental protection advantages are important problems in popularization and application of the steel slag-based geopolymer material.
CN1286766C discloses a cement clinker-free alkali cementing material, which is prepared by mixing steel slag-metakaolin composite cementing material, steel slag, metakaolin, a water glass solution, sodium sulfate and sodium fluoride. The technical scheme has the defects that: the metakaolin is used as a calcined product of kaolinite mineral products, compared with cement, the environmental protection advantage is not obvious, and the proportioning rule of the cementing material is that the compressive strength is gradually improved along with the improvement of the metakaolin proportion, so that when the strength of the cementing material is higher, the metakaolin proportion is higher, and the steel slag proportion is less; in addition, a large amount of water glass solution, sodium sulfate and sodium fluoride are used as alkali activators in the technical scheme, and the production of the alkali activators also needs to consume energy and discharge pollutants, so that the environment-friendly advantage of the cementing material is not outstanding, and the cementing material has no reference significance for the technical problems needing to be solved at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a CNF reinforced steel slag-based geopolymer cementing material, a preparation method and application thereof, and the formed body obtained by the method has better comprehensive mechanical properties, can better realize the application of the geopolymer material in the field of building engineering materials, and provides a new direction for the resource utilization of steel slag.
The purpose of the invention can be realized by the following technical scheme:
the CNF reinforced steel slag-based geopolymer cementing material comprises the following components in parts by weight:
the steel slag steel further comprises CNF, wherein the mass of the CNF is 0.1-0.5% of that of the steel slag.
Further, the length of the CNF is 1-15 μm, and the diameter of the cross section of the CNF is 50-200 nm.
Further, the average particle size of the steel slag is 15-25 μm.
Further, the content of CaO in the steel slag is 30-40 wt%, and Fe2O3The content of (A) is 22-28 wt%, SiO213-17 wt%, 5-9 wt% MgO, Al2O3The content of (B) is 4-6 wt%.
Further preferably, the content of CaO in the steel slag is 33-37 wt%, and Fe2O3The content of (A) is 24-26 wt%, SiO214-16 wt%, MgO 6-8 wt%, Al2O3The content of (B) may be 5 to 6 wt%.
Further preferably, in the cementing material, the main component of the steel slag can comprise CaO and Fe2O3、SiO2、MgO、Al2O3And the like. Wherein the content of CaO is 30-40 wt%, and Fe2O3The content of (B) may be 22 to 28 wt%, SiO2May be 13 to 17 wt%, and MgO may be contained in an amount of5～9wt％、Al2O3The content of (B) may be 4 to 6 wt%. Preferably, the CaO content is 33-37 wt%, and Fe2O3The content of (B) can be 24-26 wt%, SiO2The content of (B) may be 14 to 16 wt%, the content of MgO may be 6 to 8 wt%, Al2O3The content of (B) may be 5 to 6 wt%. The steel slag is required to have proper loss on ignition, specific surface area, particle size and the like,
more preferably, the loss on ignition of the steel slag is 2-5%, and the specific surface area is 0.5-1 m2In terms of a particle size d (0.1) of 4 to 6 μm, d (0.5) of 15 to 25 μm, and d (0.9) of 70 to 90 μm.
Further preferably, the CNF reinforced steel slag-based geopolymer cementing material provided by the invention may comprise, by weight, 50 to 55 parts, 55 to 60 parts, 60 to 65 parts, or 65 to 70 parts of steel slag powder, preferably 55 to 65 parts of steel slag powder, wherein the steel slag powder is usually waste slag discharged in a crude steel smelting process.
Furthermore, the modulus of the water glass is 3.1-3.4.
Further, the water is distilled water.
The invention also provides a preparation method of the CNF reinforced steel slag-based geopolymer cementing material, which comprises the following steps:
(1) ball-milling the CNF and the steel slag in a ball mill to levigate the steel slag into steel slag powder, and uniformly dispersing the CNF in the steel slag powder to obtain a uniformly dispersed CNF and steel slag powder mixture;
(2) uniformly mixing NaOH, water glass and the balance of water to provide an alkaline activator;
(3) uniformly mixing the CNF and steel slag powder mixture provided in the step (1) and the alkaline exciting agent provided in the step (2);
(4) and (4) injecting the slurry provided by the step (3) into a mould, curing and demoulding to provide the formed body.
Further, the temperature condition for curing in the step (4) is 20-30 ℃.
The invention also protects the application of the CNF reinforced steel slag-based geopolymer cementing material in the field of preparation of building engineering materials. The CNF reinforced steel slag-based geopolymer cementing material provided by the application can be used for preparing building engineering materials, and can form a formed body with good mechanical properties after being hardened, and can be used as a load-bearing material and/or a reinforcing material and the like.
The invention also protects a formed body prepared by the CNF reinforced steel slag-based geopolymer cementing material.
Compared with the prior art, the invention has the following technical advantages:
1) the formed body prepared from the CNF reinforced steel slag-based geopolymer cementing material provided by the invention has better comprehensive mechanical properties, the 3d compressive strength can reach more than 15MPa, and the 3d flexural strength can reach more than 3 MPa; the 7d compressive strength can reach more than 17MPa, and the 7d flexural strength can reach more than 3.5 MPa; the 28d compressive strength can reach more than 19MPa, the 28d flexural strength can reach more than 4MPa, and when compared with a material without CNF, the 3d compressive strength can be improved by more than 41 percent, and the flexural strength can be improved by more than 6 percent; the compressive strength can be improved by more than 50% after 7d, and the flexural strength can be improved by more than 30%; the 28d compressive strength can be improved by over 58 percent, and the flexural strength can be improved by over 25 percent.
2) The formed body prepared by the cementing material has better mechanical property, and the steel slag-based geopolymer has the advantage of environmental protection, so that the steel slag-based geopolymer can provide better application for the geopolymer material in the field of building engineering materials, and has good industrialization prospect.
Drawings
FIG. 1 is a graph showing the results of analysis of compressive strengths at different ages in example 1 of the present invention.
FIG. 2 is a graph showing the results of analysis of flexural strength at different ages in example 1 of the present invention.
FIG. 3 is a graph showing the analysis results of compressive strengths at different ages in example 2 of the present invention.
FIG. 4 is a graph showing the analysis results of flexural strength at different ages in example 2 of the present invention.
Detailed Description
In the preparation method provided by the invention, a person skilled in the art can select a suitable method to prepare the formed body by using each raw material of the CNF reinforced steel slag-based geopolymer cementing material. For example, in the preparation process, when the CNF is mixed with the steel slag, a test milling method can be adopted to mill the steel slag with small particle size into steel slag powder, and the CNF is uniformly dispersed in the steel slag powder to form a uniform mixture of the CNF and the steel slag powder; for another example, the temperature condition for curing may be room temperature, and preferably, the temperature condition for curing may be 20 to 30 ℃.
As a part of the core technical concept of the technical scheme, the CNF and the steel slag with the specific ratio of 2-5 mm are ball-milled in a test mill, and the provided CNF and steel slag powder mixture is uniformly mixed with an alkaline activator prepared from water glass, NaOH and water in a certain ratio to obtain the CNF reinforced steel slag-based geopolymer cementing material. According to the CNF reinforced steel slag based geopolymer cementing material, the cementing material is used as a matrix, CNF fibers are doped into the matrix to reinforce and toughen the matrix, and after the cementing material is hardened by water, an obtained formed body has better comprehensive mechanical properties.
As part of the core technical concept of the technical scheme, the CNF reinforced steel slag-based geopolymer cementing material provided by the invention can comprise 5.5-6.0 parts, 6.0-6.5 parts, or 6.5-7.0 parts of water glass by weight, and preferably can comprise 5.5-6.5 parts of water glass. The water glass is usually an aqueous solution of a soluble alkali silicate material formed by combining an alkali metal oxide and silica, and may include sodium water glass and potassium water glass according to the type of alkali metal, and the molecular formula of the solute is Na2O. nSiO2 and K2O.nSiO 2, wherein the coefficient n is the modulus of the water glass. Suitable concentrations of water glass suitable for use in the construction material field should be known to those skilled in the art, for example, the concentration of alkali metal oxide in the water glass may be 8.2 wt.% or more; for another example, the concentration of silica in the water glass may be 26.0 wt% or more; as another example, the water of the water glassThe glass modulus is 3.1-3.4. In the cementing material, the water glass is mainly used for forming an alkaline activator together with NaOH and water so as to excite the geological polymerization reaction and hydration reaction of the steel slag. Among alkali activators, water glass mainly functions to provide silicate ions and siloxane oligomers.
As a part of the core technical concept of the technical scheme, the CNF reinforced steel slag-based geopolymer cementing material provided by the invention can comprise 0.8-0.9 part, 0.9-1.0 part, 1.0-1.1 part or 1.1-1.2 parts of NaOH by weight, and preferably can comprise 0.9-1.1 parts of NaOH. In the cementing material, NaOH is mainly used for forming an alkaline activator together with water glass and water so as to excite the geological polymerization reaction and hydration reaction of the steel slag. In the alkaline activator, hydroxide ion of NaOH can be used to dissolve silicon and aluminum in steel slag for subsequent geopolymerization and hydration.
As a part of the core technical concept of the technical scheme, the CNF reinforced steel slag-based geopolymer cementing material provided by the invention can comprise 20-22 parts, 22-24 parts, 24-26 parts, 26-28 parts or 28-30 parts of water by weight, and preferably can comprise 23-27 parts of water. In the cementing material, water is mainly used as a solvent of an alkaline activator to excite the geological polymerization reaction and hydration reaction of the steel slag. The water may typically be selected from distilled water.
As a part of the core technical concept of the technical scheme, the CNF-reinforced steel slag-based geopolymer cementing material provided by the invention can comprise CNF (carbon nanofiber), and the mass of the CNF can be 0.1-0.2%, 0.2-0.3%, 0.3-0.4% or 0.4-0.5% of the mass of the steel slag. The CNF can enhance the mechanical strength of the material after the cementing material is hardened. The CNF generally needs to have a proper length-diameter ratio, because the toughness of the fiber-reinforced composite cementing material depends on the length-diameter ratio of the fiber to a large extent, and as the length-diameter ratio of the fiber increases, the toughening effect of crack bending is enhanced, but as the length-diameter ratio is too high, the manufacturing cost of the fiber is greatly increased, and the difficulty of dispersion is increased, for example, the diameter of the cross section of the CNF may be 50-200 nm, 50-70 nm, 70-90 nm, 90-110 nm, 110-130 nm, 130-150 nm, 150-170 nm, or 170-200 nm, and further, for example, the length of the CNF may be 1-15 μm, 1-2 μm, 2-3 μm, 3-5 μm, 5-7 μm, 7-9 μm, 9-11 μm, 11-13 μm, or 13-15 μm.
The method for preparing the formed body provided by the invention comprises the following steps:
(1) ball-milling CNF and steel slag with the particle size of 2-5 mm in a ball mill to levigate the steel slag into steel slag powder, and uniformly dispersing the CNF in the steel slag powder to form a uniformly dispersed CNF and steel slag powder mixture;
(2) uniformly mixing NaOH, water glass and the balance of water to provide an alkaline activator;
(3) uniformly mixing the CNF and steel slag powder mixture provided in the step (1) and the alkaline exciting agent provided in the step (2);
(4) and (4) injecting the slurry provided by the step (3) into a mould, curing and demoulding to provide the formed body, wherein the formed body can be a CNF reinforced steel slag-based geopolymer.
In the preparation method provided by the invention, a person skilled in the art can select a suitable method to prepare the formed body by using each raw material of the CNF reinforced steel slag-based geopolymer cementing material. For example, in the preparation process, when the CNF is mixed with the steel slag, a test milling method can be adopted to mill the steel slag with small particle size into steel slag powder, and the CNF is uniformly dispersed in the steel slag powder to form a uniform mixture of the CNF and the steel slag powder; for another example, the temperature condition for curing may be room temperature, and preferably, the temperature condition for curing may be 20 to 30 ℃.
The formed body prepared from the CNF reinforced steel slag-based geopolymer cementing material provided by the invention has better comprehensive mechanical properties, the 3d compressive strength can reach more than 15MPa, and the 3d flexural strength can reach more than 3 MPa; the 7d compressive strength can reach more than 17MPa, and the 7d flexural strength can reach more than 3.5 MPa; the 28d compressive strength can reach more than 19MPa, the 28d flexural strength can reach more than 4MPa, and when compared with a material without CNF, the 3d compressive strength can be improved by more than 41 percent, and the flexural strength can be improved by more than 6 percent; the compressive strength can be improved by more than 50% after 7d, and the flexural strength can be improved by more than 30%; the 28d compressive strength can be improved by over 58 percent, and the flexural strength can be improved by over 25 percent. Generally, the formed body prepared by the cementing material has better mechanical property, and because of the environmental protection advantage of the steel slag-based geopolymer, the steel slag-based geopolymer can provide better application for the geopolymer material in the field of building engineering materials, and has good industrialization prospect.
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
The steel slag with small grain size (2-5 mm) produced by a mineral product processing plant of Shenzhen Shen county, Shijiazhuang city, Hebei province is selected, and the main chemical compositions of the steel slag are 36.54% of CaO and 24.56% of Fe2O3，15.64％SiO2，7.39％MgO，5.43％Al2O3，4.54％MnO，2.62％P2O5，1.75％TiO21.53 percent of other components, and the loss on ignition is 3.63 percent (all the mass percentages); analytically pure NaOH available from Shanghai Aladdin Biotechnology Ltd; industrial water glass of Shandong optimal chemical plant, modulus 3.3, and its main chemical composition is 8.11% Na2O，5.89％SiO2，66％H2O; XFM60CNF (diameter 50-200 nm, length 1-15 μm, purity more than or equal to 95%) of Nanjing Xiancheng nanometer material science and technology Limited company, the doping amount is 0.1% of the steel slag mass; distilled water; selecting a Jiangsu tin-free suggested SM-500 test mill, wherein the rotating speed is 48 r/min.
The preparation method in this example includes the following steps:
(1) adding 3g of CNF and 3000g of steel slag into a test mill, and ball-milling for 0.5h to obtain a uniformly dispersed CNF and steel slag powder mixture;
(2) 385g of water glass, 65g of NaOH and 530g of distilled water are mixed and stirred uniformly, and cooled for 24 hours for standby, so as to obtain an alkaline activator;
(3) adding the CNF and steel slag powder mixture provided in the step (1) and the alkaline activator obtained in the step (2) into a cement mixer, quickly stirring for 2min, slowly stirring for 2min, then injecting the slurry into a mold, vibrating for 1-2min according to the release degree of bubbles, leveling and wrapping with a plastic film;
(4) curing at room temperature (20-30 ℃) for 24 hours, demoulding, wrapping with a plastic film again, and curing at room temperature to an age;
(5) the compressive strength and the flexural strength of the CNF reinforced steel slag-based polymer obtained in this example were tested.
The compressive strength and the flexural strength of the CNF reinforced steel slag-based geopolymer obtained in the step (5) are compared with the strength of the steel slag-based geopolymer under the same alkali-activator ratio (only the CNF is not added in the steel slag ball milling process) by referring to 'building mortar basic performance test method Standard' JGJ/T70-2009, and the results are shown in fig. 1 and fig. 2.
Example 2
In the embodiment, the steel slag with small particle size (2-5 mm) produced by the mineral processing plant of Shenzhen mine product in Shijiazhuang city, Hebei province is selected, and the main chemical compositions of the steel slag are 36.54% of CaO and 24.56% of Fe2O3，15.64％SiO2，7.39％MgO，5.43％Al2O3，4.54％MnO，2.62％P2O5，1.75％TiO21.53 percent of other components, and the loss on ignition is 3.63 percent (all the mass percentages); analytically pure NaOH available from Shanghai Aladdin Biotechnology Ltd; industrial water glass of Shandong optimal chemical plant, modulus 3.3, and its main chemical composition is 8.11% Na2O，5.89％SiO2，66％H2O; XFM60CNF (diameter 50-200 nm, length 1-15 μm, purity more than or equal to 95%) of Nanjing Xiancheng nanometer material science and technology Limited company, the doping amount is 0.5% of the steel slag quality; distilled water; selecting a Jiangsu tin-free suggested SM-500 test mill, wherein the rotating speed is 48 r/min.
The CNF reinforced steel slag-based geopolymer in the embodiment is prepared by the following method:
(1) adding 15g of CNF and 3000g of steel slag into a test mill, and ball-milling for 0.5h to obtain a uniformly dispersed CNF and steel slag powder mixture;
(2) 385g of water glass, 65g of NaOH and 530g of distilled water are mixed and stirred uniformly, and cooled for 24 hours for standby, so as to obtain an alkaline activator;
(3) adding the CNF and steel slag powder mixture provided in the step (1) and the alkaline activator obtained in the step (2) into a cement mixer, quickly stirring for 2min, slowly stirring for 2min, then injecting the slurry into a mold, vibrating for 1-2min according to the release degree of bubbles, leveling and wrapping with a plastic film;
(4) curing at room temperature (20-30 ℃) for 24 hours, demoulding, wrapping with a plastic film again, and curing at room temperature to an age;
(5) the compressive strength and the flexural strength of the CNF reinforced steel slag-based polymer obtained in this example were tested.
The compressive strength and the flexural strength of the CNF-reinforced steel slag-based geopolymer obtained in the step (5) are compared with the strength of the steel slag-based geopolymer under the same alkali-activator ratio (only the CNF is not added in the steel slag ball milling process) by referring to 'building mortar basic performance test method Standard' JGJ/T70-2009, and the results are shown in fig. 3 and 4.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has a high industrial utilization value.
Comparative example 1
CN1286766C discloses an alkali cement-free clinker cement. The steel slag-metakaolin composite cementing material is prepared by mixing steel slag, metakaolin, a water glass solution, sodium sulfate and sodium fluoride, and comprises the following components in parts by mass: steel slag, metakaolin, water glass solution and Na2SO4NaF is 1: 0.1-9: 0.66-8: 0.033-0.3: 0.022-0.2; wherein the specific surface area of the steel slag is 400-650m2Kg, alkalinity > 1.2; the metakaolin is coal-series kaolin calcined at the temperature of 650-800 ℃, and the specific surface area is 500-700m2Per kg; the modulus of the water glass is 1.0-2.0, and the baume degree of the water glass is 33-44 degrees.
Compared with the comparative example 1, the raw material in the technical scheme completely uses the solid waste material steel slag, the sodium hydroxide and water glass solution in the alkaline solution account for less (15% of the raw material mass), and the CNF accounts for extremely low (0.1% -0.5% of the raw material mass), so that the cementing material has the advantages of environmental protection and outstanding mechanical property, effectively overcomes various defects in the prior art, and has high industrial utilization value.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The CNF reinforced steel slag-based geopolymer cementing material is characterized by comprising the following components in parts by weight:
the steel slag steel further comprises CNF, wherein the mass of the CNF is 0.1-0.5% of that of the steel slag.
2. The CNF-reinforced steel slag-based geopolymer cementing material of claim 1, wherein the length of the CNF is 1-15 μm, and the diameter of the cross section of the CNF is 50-200 nm.
3. The CNF-reinforced steel slag-based geopolymer cementing material of claim 1, wherein the average particle size of the steel slag is 15-25 μm.
4. The CNF-reinforced steel slag-based geopolymer cementing material of claim 1, wherein the content of CaO in the steel slag is 30-40 wt% and Fe2O3The content of (A) is 22-28 wt%, SiO213-17 wt%, 5-9 wt% MgO, Al2O3In an amount of4～6wt％。
5. The CNF-reinforced steel slag-based geopolymer cementing material of claim 4, wherein the content of CaO in the steel slag is 33-37 wt% and Fe2O3The content of (A) is 24-26 wt%, SiO214-16 wt%, MgO 6-8 wt%, Al2O3The content of (B) may be 5 to 6 wt%.
6. The CNF-reinforced steel slag-based geopolymer cementing material of claim 4, wherein the loss on ignition of the steel slag is 2-5%, and the specific surface area is 0.5-1 m2In terms of a particle size d (0.1) of 4 to 6 μm, d (0.5) of 15 to 25 μm, and d (0.9) of 70 to 90 μm.
7. The CNF-reinforced steel slag-based geopolymer cementing material of claim 1, wherein the modulus of the water glass is 3.1-3.4.
8. A shaped body prepared from the CNF-reinforced steel slag-based geopolymer cement of claim 1.
9. A process for the preparation of a CNF-reinforced steel slag-based geopolymer cement moulded body according to claim 8, characterized in that it comprises the following steps:
(1) ball-milling the CNF and the steel slag in a ball mill to levigate the steel slag into steel slag powder, and uniformly dispersing the CNF in the steel slag powder to obtain a uniformly dispersed CNF and steel slag powder mixture;
(2) uniformly mixing NaOH, water glass and the balance of water to provide an alkaline activator;
(3) uniformly mixing the CNF and steel slag powder mixture provided in the step (1) and the alkaline exciting agent provided in the step (2);
(4) and (4) injecting the slurry provided by the step (3) into a mould, curing and demoulding to provide the formed body.
10. Use of the CNF-reinforced steel slag-based geopolymer cement of claim 1 in construction materials.
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| CN (1) | CN112390578A (en) |
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| CN114907042A (en) * | 2022-05-26 | 2022-08-16 | 福建工程学院 | Photocatalytic steel slag floating concrete and preparation method thereof |
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| CN116375402A (en) * | 2023-04-04 | 2023-07-04 | 石家庄铁道大学 | Steel slag base polymer energy-absorbing material and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114907042A (en) * | 2022-05-26 | 2022-08-16 | 福建工程学院 | Photocatalytic steel slag floating concrete and preparation method thereof |
| CN115490447A (en) * | 2022-10-09 | 2022-12-20 | 碳达(深圳)新材料技术有限责任公司 | Full-solid waste alkali-activated cementing material and preparation method thereof |
| CN115490447B (en) * | 2022-10-09 | 2023-04-25 | 碳达(深圳)新材料技术有限责任公司 | Full solid waste alkali-activated cementing material and preparation method thereof |
| CN116375402A (en) * | 2023-04-04 | 2023-07-04 | 石家庄铁道大学 | Steel slag base polymer energy-absorbing material and preparation method thereof |
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Application publication date: 20210223 |