CN114804675A - Composite alkali-activated cementing material and preparation method thereof - Google Patents
Composite alkali-activated cementing material and preparation method thereof Download PDFInfo
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- CN114804675A CN114804675A CN202210501701.8A CN202210501701A CN114804675A CN 114804675 A CN114804675 A CN 114804675A CN 202210501701 A CN202210501701 A CN 202210501701A CN 114804675 A CN114804675 A CN 114804675A
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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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
- 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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- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses a composite alkali-activated cementing material and a preparation method thereof, belonging to the field of highway engineering materials. The composite alkali-activated cementing material comprises the following raw materials: steel slag, magnesium slag, fly ash, phosphogypsum, quicklime, sodium silicate and sodium hydroxide. The preparation method of the cementing material comprises the steps of firstly carrying out alkaline pretreatment on phosphogypsum, simultaneously carrying out high-temperature activation on steel slag, magnesium slag and slag by adopting fly ash, and then mixing the pretreated phosphogypsum, the steel slag, the magnesium slag, the slag and an alkaline activator to prepare the composite alkaline-activated cementing material. The composite alkali-activated cementing material prepared by the invention has the characteristics of low energy consumption, high strength, good durability and the like, and the raw materials are easy to obtain, so that the solid waste reutilization rate is greatly improved, a large amount of sand stone and cement resources are saved, and the purpose of protecting the environment is achieved. The composite alkali-activated cementing material can meet the requirements of different types of soil, so that the mechanical property of the soil is greatly improved, and the soil is high in strength and good in stability after being cemented with the soil.
Description
Technical Field
The invention relates to the field of highway engineering materials, in particular to a composite alkali-activated cementing material and a preparation method thereof.
Background
With the continuous development of highway industry, the natural resources of road building materials are gradually deficient, a large amount of building materials such as cement, lime, sand and stone are needed in the traditional road engineering, and because the exploitation and preparation of the building materials need to consume a large amount of natural resources and energy, and a large amount of building materials are often required to be transported for a long distance in construction, the energy consumption is large, the cost is high, and the environmental pollution is serious. How to select engineering materials, reduce construction cost and comprehensively improve the utilization rate of industrial solid wastes and environmental protection requirements becomes an important problem to be faced at present.
The application is a novel composite alkali-activated cementing material created aiming at the existing problems and a preparation method thereof, and the novel composite alkali-activated cementing material is prepared by firstly pretreating phosphogypsum, steel slag, magnesium slag and mineral slag and then mixing the pretreated phosphogypsum, the steel slag, the magnesium slag and the mineral slag with an alkali activator, so that the activity of the cementing material is improved, the characteristics of low construction requirement, low energy consumption, high strength and good durability of the cementing material are met, a new thought is provided for the selection of novel highway engineering materials, the utilization rate of industrial solid wastes is greatly improved, the environment is protected, and the novel composite alkali-activated cementing material becomes the target which is greatly required to be improved in the current industry.
Disclosure of Invention
The invention aims to solve the technical problem of providing a composite alkali-activated cementing material, which is prepared by pretreating phosphogypsum, steel slag, magnesium slag and mixing the pretreated phosphogypsum, steel slag, magnesium slag and slag with an alkali activator, so that the cementing material which meets the requirements of low construction requirement, low energy consumption, high strength and good durability of the cementing material is obtained, a new thought is provided for selecting novel highway engineering materials, the utilization rate of industrial solid wastes is greatly improved, the environment is protected, and the defects of the conventional highway engineering materials are overcome.
In order to solve the technical problems, the invention provides a composite alkali-activated cementing material which comprises the following raw materials in percentage by mass: 5-36% of steel slag, 3-37% of magnesium slag, 4-33% of slag, 3-27% of fly ash, 3-32% of phosphogypsum, 2-12% of quicklime, 3-6% of sodium silicate and 1-3% of sodium hydroxide.
The further improvement comprises the following raw materials in percentage by mass: 22% of steel slag, 16% of magnesium slag, 18% of slag, 8% of fly ash, 23% of phosphogypsum, 7% of quicklime, 4% of sodium silicate and 2% of sodium hydroxide.
Or, the raw materials comprise the following raw materials in percentage by mass: 10% of steel slag, 13% of magnesium slag, 23% of slag, 25% of fly ash, 8% of phosphogypsum, 12% of quick lime, 6% of sodium silicate and 3% of sodium hydroxide.
Or, the raw materials comprise the following raw materials in percentage by mass: 28% of steel slag, 20% of magnesium slag, 19% of slag, 8% of fly ash, 10% of phosphogypsum, 6% of quicklime, 6% of sodium silicate and 3% of sodium hydroxide.
In a further improvement, the sodium hydroxide is industrial sodium hydroxide, and the sodium silicate is industrial sodium silicate with the modulus of 2.6-3.0.
The invention also provides a preparation method of the composite alkali-activated cementing material, which comprises the following steps:
s1, mixing raw materials of phosphogypsum and quicklime according to mass percent, adding water for mixing, adjusting the pH value of the mixture to be more than 12, drying to constant weight, and grinding into pretreated phosphogypsum with the particle size of less than 0.075 mm. In the step, the acidic phosphogypsum is adjusted to be alkaline through quicklime and water, so that the pozzolanic activity of a reactant of the phosphogypsum in an alkali excitation system can be improved.
S2, respectively adding 15 wt% of fly ash in the raw material fly ash into the raw material steel slag, magnesium slag and slag, respectively mixing uniformly, roasting and activating at the high temperature of 800 ℃ for 5h at 300-. In the step, the silicon-aluminum glass body in the fly ash is remelted at high temperature, then f-CaO and f-MgO in the steel slag, the magnesium slag and the slag are absorbed, and the temperature is rapidly reduced to complete reconstruction and modification of the steel slag, the magnesium slag and the slag, so that the volume stability is improved.
S3, uniformly mixing the phosphogypsum, the steel slag, the magnesium slag and the slag pretreated in the steps S1 and S2 with the rest part by weight of fly ash to prepare a mixture I.
S4, mixing the raw materials of sodium hydroxide and sodium silicate according to the ratio of 1:2, uniformly stirring, standing and aging for 24 hours, and drying to prepare a mixture II; the mixing ratio of the sodium hydroxide and the sodium silicate can exert better alkali excitation effect.
S5, uniformly mixing the first mixture and the second mixture, and then grinding the mixture until the particle size of the mixture is smaller than 0.075mm to obtain the composite alkali-activated binding material.
In a further improvement, the pretreated phosphogypsum in the step S1 is ground by a ball milling method, and the drying and grinding temperature is 60 ℃. The purpose is to prevent phosphogypsum from becoming hemihydrate gypsum at the temperature higher than 60 ℃ and influencing the performance of the cementing material.
After adopting such design, the invention has at least the following advantages:
the invention makes use of various industrial waste residues, quicklime, sodium silicate and sodium hydroxide, organically combines the industrial waste residues, the quicklime, the sodium silicate and the sodium hydroxide by adopting a unique preparation method, exerts the synergistic effect among the raw materials and prepares the composite alkali-activated cementing material which is convenient to use and transport. The composite alkali-activated cementing material has the characteristics of low energy consumption, high strength, good durability and the like, and the raw materials are easy to obtain and can be obtained locally, so that a large amount of sand and stone and cement resources are saved, different types of soil can be met, and the construction cost is reduced to a great extent; the solid waste can be recycled, and the national call for energy conservation, emission reduction and circular economy is fully responded.
The composite alkali-activated cementing material disclosed by the invention has the advantages that as the steel slag, the magnesium slag, the slag and the fly ash are baked and dried at high temperature, the cementing material is mixed with water and then mechanically compacted, considerable pavement strength can be achieved after watering maintenance, the engineering strength requirement of paved roads is met, the later strength of a base layer and a bottom layer is enhanced along with the prolonging of maintenance time, the water stability is good, and the service life is long. The composite alkali-activated cementing material provides a new idea for selecting novel highway engineering materials.
Detailed Description
Example 1
The composite alkali-activated cementing material comprises the following raw materials in percentage by mass: 22% of steel slag, 16% of magnesium slag, 18% of slag, 8% of fly ash, 23% of phosphogypsum, 7% of quicklime, 4% of sodium silicate and 2% of sodium hydroxide. Wherein, the sodium hydroxide adopts industrial grade, and the sodium silicate adopts industrial sodium silicate with modulus of 2.6-3.0.
The method for preparing the composite alkali-activated cementing material by adopting the raw materials comprises the following specific steps:
s1, mixing the raw materials of phosphogypsum and quicklime according to the mass ratio, adding water for mixing, adjusting the pH value of the mixture to be more than 12, drying to constant weight, and grinding into pretreated phosphogypsum with the particle size of less than 0.075mm by adopting a ball milling method. Wherein the drying and grinding temperature is 60 ℃.
S2, respectively adding 15 wt% of fly ash in the raw material fly ash into the raw material steel slag, magnesium slag and slag, respectively mixing uniformly, roasting and activating at the high temperature of 800 ℃ for 5 hours, then quickly cooling to constant weight, and grinding into pretreated steel slag, magnesium slag and slag with the particle size of less than 0.075 mm.
S3, uniformly mixing the phosphogypsum, the steel slag, the magnesium slag and the slag pretreated in the steps S1 and S2 with the rest part by weight of fly ash to prepare a mixture I.
S4, mixing the raw materials of sodium hydroxide and sodium silicate according to the proportion, uniformly stirring, standing and aging for 24 hours, and drying to prepare a mixture II.
S5, uniformly mixing the first mixture and the second mixture, and then grinding the mixture until the particle size of the mixture is smaller than 0.075mm to obtain the composite alkali-activated binding material 1.
The composite alkali-activated gelling material 1 prepared in this example was mixed with clay in the amounts of 0%, 5%, 10%, 15%, 20%, and 25%, to prepare a molded test piece. And then carrying out the solidified soil unconfined compressive strength test on each molded test piece. And PO32.5 type cement and clay were mixed to prepare a control molded test piece. The incorporation of PO32.5 type cement was also 0%, 5%, 10%, 15%, 20%, 25%, while carrying out the unconfined compressive strength test of the cured soil, the results of which are shown in Table 1 below.
TABLE 1 unconfined compressive strength results for composite alkali-activated cementitious material and cement of this example 1
As can be seen from Table 1 above, the cement or the composite alkali-activated cementing material 1 obtained in this example 1, which is used as a cementing material, can greatly improve the unconfined compressive strength of the clay after being mixed with the clay, and the unconfined compressive strength gradually increases with the increase of the amount of the cementing material. It can be further found that the composite alkali-activated cementing material 1 obtained in the embodiment 1 has a much better cementing effect as a cementing material than cement itself, and the analysis may be that the composite alkali-activated cementing material 1 obtained in the embodiment 1 is used as a cementing material to be mixed with clay to form cemented soil, so that the strength is greatly improved. And from the comparison of the unconfined compressive strength test time, along with the prolonging of the time, the compressive strength of the pavement forming test piece obtained by mixing the composite alkali-activated cementing material 1 obtained under the action of each raw material proportioning condition and the unique preparation method and the clay is remarkably improved, and the pavement forming test piece has the characteristics of high compressive strength and good durability.
Example 2
The difference between the composite alkali-activated cementing material in the embodiment and the embodiment 1 is that the mass percentages of the raw materials are different, and the mass percentages of the raw materials in the embodiment are as follows: 10% of steel slag, 13% of magnesium slag, 23% of slag, 25% of fly ash, 8% of phosphogypsum, 12% of quick lime, 6% of sodium silicate and 3% of sodium hydroxide.
The method for preparing the composite alkali-activated cementing material by adopting the raw materials comprises the following specific steps:
s1, mixing the raw materials of phosphogypsum and quicklime according to the mass ratio, adding water for mixing, adjusting the pH value of the mixture to be more than 12, drying to constant weight, and grinding into pretreated phosphogypsum with the particle size of less than 0.075mm by adopting a ball milling method. Wherein the drying and grinding temperature is 60 ℃.
S2, respectively adding 15 weight percent of fly ash in the raw material fly ash into the raw material steel slag, magnesium slag and slag, respectively uniformly mixing, respectively roasting and activating for 5 hours at the high temperature of 300 ℃, then quickly cooling to constant weight, and then grinding into pretreated steel slag, magnesium slag and slag with the particle size of less than 0.075 mm.
S3, uniformly mixing the phosphogypsum, the steel slag, the magnesium slag and the slag pretreated in the steps S1 and S2 with the rest part by weight of fly ash to prepare a mixture I.
S4, mixing the raw materials of sodium hydroxide and sodium silicate according to the proportion, uniformly stirring, standing and aging for 24 hours, and drying to prepare a mixture II.
S5, uniformly mixing the first mixture and the second mixture, and then grinding the mixture until the particle size of the mixture is smaller than 0.075mm to obtain the composite alkali-activated binding material 2.
The composite alkali-activated gelling material 2 prepared in this example was mixed with powdery clay in the amounts of 0%, 5%, 10%, 15%, 20%, and 25%, to prepare a molded test piece. And then carrying out the solidified soil unconfined compressive strength test on each molded test piece. And PO32.5 type cement and powdery clay were mixed to prepare a control molded specimen. The incorporation of PO32.5 type cement was also 0%, 5%, 10%, 15%, 20%, 25%, while carrying out the unconfined compressive strength test of the cured soil, the results of which are shown in Table 2 below.
TABLE 2 unconfined compressive strength results for the composite alkali-activated cementitious material of this example 2 with cement
As can be seen from Table 2 above, the cement or the composite alkali-activated cementing material 2 obtained in this example 2 is used as a cementing material, and after the cementing material is mixed with the powdery clay, although the compressive strength of the formed test piece obtained by mixing the powdery clay with the cement is reduced, the unconfined compressive strength of the powdery clay can be greatly improved, and the unconfined compressive strength is gradually increased along with the increase of the doping amount of the cementing material. In addition, compared with the compression strength of the formed test piece obtained in the embodiment 2, the composite alkali-activated cementing material 2 obtained in the embodiment 2 has a much better cementing effect as a cementing material than cement itself, and analysis may be made that the strength is greatly improved as a result of the fact that the composite alkali-activated cementing material 2 obtained in the embodiment 2 is used as a cementing material and is mixed with powdery clay to form cemented soil. It can also be found that, with the time being prolonged, the compressive strength of the pavement forming test piece obtained by mixing the composite alkali-activated cementing material 2 obtained under the action of each raw material proportioning condition and the unique preparation method and the clay is remarkably improved, and the pavement forming test piece has the characteristics of high compressive strength and good durability.
Example 3
The difference between the composite alkali-activated cementing material in the embodiment and the embodiment 1 is that the mass percentages of the raw materials are different, and the mass percentages of the raw materials in the embodiment are as follows: 28% of steel slag, 20% of magnesium slag, 19% of slag, 8% of fly ash, 10% of phosphogypsum, 6% of quicklime, 6% of sodium silicate and 3% of sodium hydroxide.
The method for preparing the composite alkali-activated cementing material by adopting the raw materials comprises the following specific steps:
s1, mixing the raw materials of phosphogypsum and quicklime according to the mass ratio, adding water for mixing, adjusting the pH value of the mixture to be more than 12, drying to constant weight, and grinding into pretreated phosphogypsum with the particle size of less than 0.075mm by adopting a ball milling method. Wherein the drying and grinding temperature is 60 ℃.
S2, respectively adding 15 wt% of fly ash in the raw material fly ash into the raw material steel slag, magnesium slag and slag, respectively mixing uniformly, roasting and activating at the high temperature of 500 ℃ for 5 hours, then quickly cooling to constant weight, and grinding into pretreated steel slag, magnesium slag and slag with the particle size of less than 0.075 mm.
S3, uniformly mixing the phosphogypsum, the steel slag, the magnesium slag and the slag pretreated in the steps S1 and S2 with the rest part by weight of fly ash to prepare a mixture I.
S4, mixing the raw materials of sodium hydroxide and sodium silicate according to the proportion, uniformly stirring, standing and aging for 24 hours, and drying to prepare a mixture II.
S5, uniformly mixing the first mixture and the second mixture, and then grinding the mixture until the particle size of the mixture is smaller than 0.075mm to obtain the composite alkali-activated binding material 3.
The composite alkali-activated cementing material 3 prepared in this example was mixed with sand at the blending amounts of 0%, 5%, 10%, 15%, 20%, and 25%, to prepare a molded test piece. And then carrying out the solidified soil unconfined compressive strength test on each molded test piece. And PO32.5 type cement and sandy soil were mixed to prepare a control molded test piece. The incorporation of PO32.5 type cement was also 0%, 5%, 10%, 15%, 20%, 25%, while carrying out the unconfined compressive strength test of the cured soil, the results of which are shown in Table 3 below.
TABLE 3 unconfined compressive strength results for the composite alkali-activated cementitious material of this example 3 with cement
As can be seen from table 3 above, the compressive strength of the formed test piece formed by mixing cement or the composite alkali-activated cementing material 3 obtained in this example 3 as a cementing material with sandy soil is closer to that of the formed test piece obtained by mixing the above example 2 with powdered clay, but compared with sandy soil itself, the unconfined compressive strength of the formed test piece is greatly improved, and the unconfined compressive strength is gradually increased with the increase of the doping amount of the cementing material. In addition, compared with the compression strength of the formed test piece obtained in the embodiment 3, the composite alkali-activated cementing material 3 obtained in the embodiment 3 still has a much better cementing effect as a cementing material than cement itself, and analysis may be caused by that the composite alkali-activated cementing material 3 obtained in the embodiment 3 is used as a cementing material to be mixed with clay to form cemented soil, so that the strength is greatly improved. It can also be found that, with the time being prolonged, the compressive strength of the pavement forming test piece obtained by mixing the composite alkali-activated cementing material 3 obtained under the action of each raw material proportioning condition and the unique preparation method and the clay is remarkably improved, and the pavement forming test piece also has the characteristics of high compressive strength and good durability.
Moreover, as can be seen from the test results of the above examples 1 to 3, the composite alkali-activated cementitious material obtained by the unique preparation method can meet the requirements of different types of soil, change the physical properties of the soil, improve the mechanical properties of the soil, and meet the engineering requirements of high strength and high quality under the condition of the raw material mixture ratio.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (7)
1. The composite alkali-activated cementing material is characterized by comprising the following raw materials in percentage by mass: 5-36% of steel slag, 3-37% of magnesium slag, 4-33% of slag, 3-27% of fly ash, 3-32% of phosphogypsum, 2-12% of quicklime, 3-6% of sodium silicate and 1-3% of sodium hydroxide.
2. The composite alkali-activated cementing material of claim 1, characterized by comprising the following raw materials in percentage by mass: 22% of steel slag, 16% of magnesium slag, 18% of slag, 8% of fly ash, 23% of phosphogypsum, 7% of quicklime, 4% of sodium silicate and 2% of sodium hydroxide.
3. The composite alkali-activated cementing material of claim 1, characterized by comprising the following raw materials by mass percent: 10% of steel slag, 13% of magnesium slag, 23% of slag, 25% of fly ash, 8% of phosphogypsum, 12% of quick lime, 6% of sodium silicate and 3% of sodium hydroxide.
4. The composite alkali-activated cementing material of claim 1, characterized by comprising the following raw materials in percentage by mass: 28% of steel slag, 20% of magnesium slag, 19% of slag, 8% of fly ash, 10% of phosphogypsum, 6% of quicklime, 6% of sodium silicate and 3% of sodium hydroxide.
5. The composite alkali-activated cementitious material of claim 1, wherein the sodium hydroxide is technical grade sodium hydroxide and the sodium silicate is technical sodium silicate with a modulus of 2.6-3.0.
6. The method for preparing the composite alkali-activated cementing material according to any one of the claims 1 to 5, characterized in that the method comprises the following steps:
s1, mixing raw materials of phosphogypsum and quicklime according to mass percentage, adding water for mixing, adjusting the pH value of the mixture to be more than 12, drying to constant weight, and grinding into pretreated phosphogypsum with the particle size of less than 0.075 mm;
s2, respectively adding 15 wt% of fly ash in the raw material fly ash into the raw material steel slag, magnesium slag and slag, respectively mixing uniformly, roasting and activating at the high temperature of 800 ℃ for 5h at 300-;
s3, uniformly mixing the phosphogypsum, the steel slag, the magnesium slag and the slag pretreated in the steps S1 and S2 with the residual part by weight of fly ash to prepare a first mixture;
s4, mixing the raw materials of sodium hydroxide and sodium silicate according to the ratio of 1:2, uniformly stirring, standing and aging for 24 hours, and drying to prepare a mixture II;
s5, uniformly mixing the first mixture and the second mixture, and then grinding the mixture until the particle size of the mixture is smaller than 0.075mm to obtain the composite alkali-activated binding material.
7. The method for preparing the composite alkali-activated cementing material according to the claim 6, characterized in that the pretreated phosphogypsum in the step S1 is ground by a ball milling method, and the temperature of drying and grinding is 60 ℃.
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| CN115448677A (en) * | 2022-08-12 | 2022-12-09 | 西安银鼎科技有限公司 | Industrial solid waste base soil curing agent and preparation method thereof |
| CN115594426A (en) * | 2022-10-28 | 2023-01-13 | 山东高速工程建设集团有限公司（Cn） | Multi-source solid waste synergistic functional cementing material and preparation method thereof |
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| CN115448677A (en) * | 2022-08-12 | 2022-12-09 | 西安银鼎科技有限公司 | Industrial solid waste base soil curing agent and preparation method thereof |
| CN115594426A (en) * | 2022-10-28 | 2023-01-13 | 山东高速工程建设集团有限公司（Cn） | Multi-source solid waste synergistic functional cementing material and preparation method thereof |
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