CN120136498A - Concrete based on iron ore tailings and preparation method thereof - Google Patents
Concrete based on iron ore tailings and preparation method 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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/066—Magnesia; Magnesium hydroxide
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
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- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to concrete based on iron ore tailings and a preparation method thereof, and belongs to the technical field of iron ore tailings application, wherein the preparation raw materials of the concrete comprise, by weight, 20-30 parts of polyacrylamide solution, 3-6 parts of magnesia powder, 5-10 parts of resin, 20-25 parts of polypropylene fiber, 10-18 parts of antioxidant and 5-12 parts of cellulose acetate butyrate powder, and the preparation raw materials of the water reducer comprise, by weight, 6-10 parts of montmorillonite powder, 10-15 parts of ferric oxide powder and 3-8 parts of corn starch. The existing iron ore tailings are added into the concrete to reduce the compressive strength and the flexural strength, and the iron ore tailings are mutually cooperated with the polyacrylamide solution, the magnesia powder and the cellulose acetate butyrate powder to reduce the influence of the iron ore tailings on the compressive strength and the flexural strength of the concrete, increase the content of the concrete as the iron ore tailings and increase the consumption of the iron ore tailings.
Description
Technical Field
The invention belongs to the technical field of iron ore tailings application, and particularly relates to concrete based on iron ore tailings and a preparation method thereof.
Background
The iron ore tailings are waste residues left after ore dressing, contain beneficial components and harmful components in the iron ore, are accumulated more due to ore exploitation, pollute the environment after long-term storage, and are usually used for preparing concrete.
However, when concrete is disposed, the proportion of iron ore tailings added is inversely related to the strength of the concrete, that is, the higher the proportion of iron ore tailings added to the concrete is, the lower the strength of the concrete is, and therefore, in order to increase the strength of the concrete, it is necessary to reduce the addition of iron ore tailings, which makes it difficult to consume a large amount of iron ore tailings.
Disclosure of Invention
The invention aims to solve the problems and provide concrete based on iron ore tailings and a preparation method thereof.
The invention realizes the above purpose through the following technical scheme:
The invention provides concrete based on iron ore tailings, which comprises the iron ore tailings, river sand, silicate cement, tap water, binding liquid and a water reducing agent;
the adhesive liquid is prepared from, by weight, 20-30 parts of polyacrylamide solution, 3-6 parts of magnesia powder, 5-10 parts of resin, 20-25 parts of polypropylene fibers, 10-18 parts of antioxidants and 5-12 parts of cellulose acetate butyrate powder, and the water reducer is prepared from, by weight, 6-10 parts of montmorillonite powder, 10-15 parts of ferric oxide powder and 3-8 parts of corn starch.
According to the preparation method, the concrete is prepared from, by weight, 20-35 parts of iron ore tailings, 10-15 parts of river sand, 35-45 parts of Portland cement, 60-80 parts of tap water, 5-10 parts of binding liquid and 8-15 parts of water reducer.
As a further optimization scheme of the invention, the preparation process of the polyacrylamide solution comprises the steps of placing the polyacrylamide colloid in a container and stirring for 30-45min, adding pure water in the stirring process and mixing with the pure water, and obtaining the polyacrylamide solution after full mixing, wherein the stirring speed is 60rpm.
As a further optimization scheme of the invention, the mass ratio of the polyacrylamide colloid to the pure water is 1:5.
The preparation process of the resin comprises the steps of heating and fusing furfuryl alcohol resin and rosin to obtain the resin, mixing palmitic acid, magnesium stearate and glycerin, adding distilled water, and heating to 80-120 ℃ to obtain the antioxidant.
According to the preparation method, the resin is prepared from, by weight, 30-45 parts of furfuryl alcohol resin and 10-20 parts of rosin, and the antioxidant is prepared from, by weight, 20-35 parts of palmitic acid, 6-10 parts of magnesium stearate, 10-20 parts of glycerol and 50-60 parts of distilled water.
The invention also provides a preparation method of the concrete based on the iron ore tailings, which comprises the following steps:
S1, heating a polyacrylamide solution to 100-120 ℃, stirring after the temperature is reached, wherein the stirring speed is 80rpm, stirring for 45-60min, adding magnesia powder and polypropylene fiber in the 10 th min of stirring, adding resin and cellulose acetate butyrate powder in the 20 th min of stirring, and finally adding an antioxidant in the 30 th min of stirring to obtain a bonding liquid;
S2, mixing montmorillonite powder, ferric oxide powder and corn starch, and grinding to 10-15nm through a grinding process to obtain a water reducer;
s3, adding the adhesive liquid into tap water, uniformly mixing to obtain a mixture, and putting the mixture into a cement mixer;
and S4, putting the iron ore tailings, the river sand and the acid salt cement into the cement mixer with the mixture in the step S3, stirring, adding the water reducer during stirring, and uniformly mixing to obtain the concrete.
As a further optimization scheme of the invention, the stirring time in the step S4 is 20-35min, and the stirring speed is 60rpm.
The application has the beneficial effects that the compressive strength and the flexural strength of the existing iron ore tailings are reduced when the iron ore tailings are added into the concrete, and the iron ore tailings are mutually cooperated with the polyacrylamide solution, the magnesia powder and the cellulose acetate butyrate powder, so that the influence of the iron ore tailings on the compressive strength and the flexural strength of the concrete is reduced, the content of the concrete when the iron ore tailings are increased, and the consumption of the iron ore tailings is increased.
Detailed Description
The following detailed description of the application is provided to illustrate the application and should not be construed as limiting the scope of the application since it is intended that the following detailed description is given for the purpose of illustration only, and that certain non-essential modifications and adaptations of the application may occur to those skilled in the art in light of the foregoing disclosure.
Example 1
The concrete of the embodiment is prepared by the following steps:
placing the polyacrylamide colloid into a container, stirring for 30min, adding pure water in the stirring process, mixing with the pure water, and fully mixing to obtain a polyacrylamide solution, wherein the stirring speed is 60rpm, and the mass ratio of the polyacrylamide colloid to the pure water is 1:5;
mixing 20 parts of palmitic acid, 6 parts of magnesium stearate and 10 parts of glycerol, adding 50 parts of distilled water, and heating to 80 ℃ to obtain an antioxidant;
Heating 20 parts of polyacrylamide solution to 100 ℃, stirring when the temperature reaches, wherein the stirring speed is 80rpm, stirring for 45min, adding 3 parts of magnesia powder and 20 parts of polypropylene fibers in the 10 th min of stirring, adding 5 parts of resin and 5 parts of cellulose acetate butyrate powder in the 20 th min of stirring, and finally adding 10 parts of antioxidant in the 30 th min of stirring to obtain a bonding liquid;
Mixing 6 parts of montmorillonite powder, 10 parts of ferric oxide powder and 3 parts of corn starch, and grinding to 10nm through a grinding process to obtain a water reducer;
Adding 5 parts of binding solution into 60 parts of tap water, uniformly mixing to obtain a mixture, and putting the mixture into a cement mixer;
20 parts of iron ore tailings, 10 parts of river sand and 35 parts of silicate cement are put into a cement mixer containing the mixture, the mixture is stirred (the stirring time is 20min, the stirring speed is 60 rpm), 8 parts of water reducer is added during stirring, and the mixture is uniformly mixed to obtain the concrete.
Example 2
The concrete of the embodiment is prepared by the following steps:
placing the polyacrylamide colloid into a container, stirring for 35min, adding pure water in the stirring process, mixing with the pure water, and fully mixing to obtain a polyacrylamide solution, wherein the stirring speed is 60rpm, and the mass ratio of the polyacrylamide colloid to the pure water is 1:5;
mixing 28 parts of palmitic acid, 8 parts of magnesium stearate and 15 parts of glycerol, adding 55 parts of distilled water, and heating to 100 ℃ to obtain an antioxidant;
heating 25 parts of polyacrylamide solution to 110 ℃, stirring after the temperature reaches, wherein the stirring speed is 80rpm, stirring for 50min, adding 5 parts of magnesia powder and 22 parts of polypropylene fibers in the 10 th min of stirring, adding 8 parts of resin and 8 parts of cellulose acetate butyrate powder in the 20 th min of stirring, and finally adding 14 parts of antioxidant in the 30 th min of stirring to obtain a bonding liquid;
mixing 8 parts of montmorillonite powder, 12 parts of ferric oxide powder and 6 parts of corn starch, and grinding to 13nm through a grinding process to obtain a water reducer;
Adding 8 parts of binding solution into 70 parts of tap water, uniformly mixing to obtain a mixture, and putting the mixture into a cement mixer;
30 parts of iron ore tailings, 12 parts of river sand and 40 parts of silicate cement are put into a cement mixer containing the mixture, the mixture is stirred (the stirring time is 30min, the stirring speed is 60 rpm), 10 parts of water reducer is added during stirring, and the mixture is uniformly mixed to obtain concrete.
Example 3
The concrete of the embodiment is prepared by the following steps:
placing the polyacrylamide colloid into a container, stirring for 45min, adding pure water in the stirring process, mixing with the pure water, and fully mixing to obtain a polyacrylamide solution, wherein the stirring speed is 60rpm, and the mass ratio of the polyacrylamide colloid to the pure water is 1:5;
Mixing 35 parts of palmitic acid, 10 parts of magnesium stearate and 20 parts of glycerol, adding 60 parts of distilled water, and heating to 120 ℃ to obtain an antioxidant;
Heating 30 parts of polyacrylamide solution to 120 ℃, stirring when the temperature reaches, wherein the stirring speed is 80rpm, stirring for 60min, adding 6 parts of magnesia powder and 25 parts of polypropylene fibers in the 10 th min of stirring, adding 10 parts of resin and 12 parts of cellulose acetate butyrate powder in the 20 th min of stirring, and finally adding 18 parts of antioxidant in the 30 th min of stirring to obtain a bonding liquid;
Mixing 10 parts of montmorillonite powder, 15 parts of ferric oxide powder and 8 parts of corn starch, and grinding to 15nm through a grinding process to obtain a water reducer;
Adding 10 parts of binding solution into 80 parts of tap water, uniformly mixing to obtain a mixture, and putting the mixture into a cement mixer;
35 parts of iron ore tailings, 15 parts of river sand and 45 parts of Portland cement are put into a cement mixer containing the mixture, the mixture is stirred (the stirring time is 35min, the stirring speed is 60 rpm), 15 parts of water reducer is added during stirring, and the mixture is uniformly mixed to obtain the concrete.
Comparative example 1
The concrete of the comparative example is prepared by the following steps:
Placing the epoxy resin colloid into a container, stirring for 35min, adding pure water in the stirring process, mixing with the pure water, and obtaining an epoxy resin solution after full mixing, wherein the stirring speed is 60rpm, and the mass ratio of the epoxy resin colloid to the pure water is 1:5;
mixing 28 parts of palmitic acid, 8 parts of magnesium stearate and 15 parts of glycerol, adding 55 parts of distilled water, and heating to 100 ℃ to obtain an antioxidant;
Heating 25 parts of epoxy resin solution to 110 ℃, stirring when the temperature reaches, wherein the stirring speed is 80rpm, stirring for 50min, adding 5 parts of magnesia powder and 22 parts of polypropylene fibers in the 10 th min of stirring, adding 8 parts of resin and 8 parts of cellulose acetate butyrate powder in the 20 th min of stirring, and finally adding 14 parts of antioxidant in the 30 th min of stirring to obtain adhesive liquid;
mixing 8 parts of montmorillonite powder, 12 parts of ferric oxide powder and 6 parts of corn starch, and grinding to 13nm through a grinding process to obtain a water reducer;
Adding 8 parts of binding solution into 70 parts of tap water, uniformly mixing to obtain a mixture, and putting the mixture into a cement mixer;
30 parts of iron ore tailings, 12 parts of river sand and 40 parts of silicate cement are put into a cement mixer containing the mixture, the mixture is stirred (the stirring time is 30min, the stirring speed is 60 rpm), 10 parts of water reducer is added during stirring, and the mixture is uniformly mixed to obtain concrete.
Comparative example 2
The concrete of the comparative example is prepared by the following steps:
placing the polyacrylamide colloid into a container, stirring for 35min, adding pure water in the stirring process, mixing with the pure water, and fully mixing to obtain a polyacrylamide solution, wherein the stirring speed is 60rpm, and the mass ratio of the polyacrylamide colloid to the pure water is 1:5;
mixing 28 parts of palmitic acid, 8 parts of magnesium stearate and 15 parts of glycerol, adding 55 parts of distilled water, and heating to 100 ℃ to obtain an antioxidant;
Heating 26.6 parts of polyacrylamide solution to 110 ℃, stirring after the temperature reaches, wherein the stirring speed is 80rpm, stirring for 50min, adding 24.5 parts of polypropylene fiber in the 10 th min of stirring, adding 8.5 parts of resin and 8.5 parts of cellulose acetate butyrate powder in the 20 th min of stirring, and finally adding 16 parts of antioxidant in the 30 th min of stirring to obtain a bonding liquid;
mixing 8 parts of montmorillonite powder, 12 parts of ferric oxide powder and 6 parts of corn starch, and grinding to 13nm through a grinding process to obtain a water reducer;
Adding 8 parts of binding solution into 70 parts of tap water, uniformly mixing to obtain a mixture, and putting the mixture into a cement mixer;
30 parts of iron ore tailings, 12 parts of river sand and 40 parts of silicate cement are put into a cement mixer containing the mixture, the mixture is stirred (the stirring time is 30min, the stirring speed is 60 rpm), 10 parts of water reducer is added during stirring, and the mixture is uniformly mixed to obtain concrete.
Comparative example 3
The concrete of the comparative example is prepared by the following steps:
placing the polyacrylamide colloid into a container, stirring for 35min, adding pure water in the stirring process, mixing with the pure water, and fully mixing to obtain a polyacrylamide solution, wherein the stirring speed is 60rpm, and the mass ratio of the polyacrylamide colloid to the pure water is 1:5;
mixing 28 parts of palmitic acid, 8 parts of magnesium stearate and 15 parts of glycerol, adding 55 parts of distilled water, and heating to 100 ℃ to obtain an antioxidant;
Heating 27.6 parts of polyacrylamide solution to 110 ℃, stirring after the temperature reaches, wherein the stirring speed is 80rpm, stirring for 50min, adding 5.6 parts of magnesia powder and 24.3 parts of polypropylene fibers in the 10 th min of stirring, adding 9 parts of resin in the 20 th min of stirring, and finally adding 15.5 parts of antioxidant in the 30 th min of stirring to obtain a bonding liquid;
mixing 8 parts of montmorillonite powder, 12 parts of ferric oxide powder and 6 parts of corn starch, and grinding to 13nm through a grinding process to obtain a water reducer;
Adding 8 parts of binding solution into 70 parts of tap water, uniformly mixing to obtain a mixture, and putting the mixture into a cement mixer;
30 parts of iron ore tailings, 12 parts of river sand and 40 parts of silicate cement are put into a cement mixer containing the mixture, the mixture is stirred (the stirring time is 30min, the stirring speed is 60 rpm), 10 parts of water reducer is added during stirring, and the mixture is uniformly mixed to obtain concrete.
Comparative example 4
The concrete of the comparative example is prepared by the following steps:
mixing 8 parts of montmorillonite powder, 12 parts of ferric oxide powder and 6 parts of corn starch, and grinding to 13nm through a grinding process to obtain a water reducer;
Adding 8 parts of binding solution into 70 parts of tap water, uniformly mixing to obtain a mixture, and putting the mixture into a cement mixer;
12 parts of river sand and 40 parts of silicate cement are put into a cement mixer containing the mixture, the mixture is stirred (the stirring time is 30min, the stirring speed is 60 rpm), 10 parts of water reducer is added during stirring, and the mixture is uniformly mixed to obtain concrete.
Comparative example 5
The concrete of the comparative example is prepared by the following steps:
mixing 8 parts of montmorillonite powder, 12 parts of ferric oxide powder and 6 parts of corn starch, and grinding to 13nm through a grinding process to obtain a water reducer;
30 parts of iron ore tailings, 12 parts of river sand and 40 parts of silicate cement are put into a cement mixer containing the mixture, the mixture is stirred (the stirring time is 30min, the stirring speed is 60 rpm), 10 parts of water reducer is added during stirring, and the mixture is uniformly mixed to obtain concrete.
Performance test
1.1, Concrete samples prepared in examples 1-3 and comparative examples 1-5 were taken, compressive strength and flexural strength performance were tested according to the concrete strength test evaluation Standard GB/T50107-2010 at the ages of 3d and 28d, portland cement (from Jianghuai building materials science and technology Co., ltd.) for test, river sand (ISO standard sand) and iron ore tailings (extra fine sand meeting GB/T31288-2014 and having a fineness modulus of 1.5-0.7 were selected).
TABLE 1 product Performance test
The test results are shown in Table 1 above, comparing examples 1-3 and finding that the proportioned parts by weight of the concrete used in example 2 is optimal in both compressive strength and flexural strength, comparing comparative example 1 with example 2 and finding that comparative example 1 is not as good as example 2 in compressive strength and flexural strength by changing the polyacrylamide solution to an epoxy solution, and then comparing comparative example 4 with example 2 and finding that comparative example 2 is not as good as example 2 in compressive strength and flexural strength, comparing comparative example 2 with example 2 and finding that no magnesium oxide powder is added to comparative example 2 and making comparative example 2 not as example 2 in compressive strength and flexural strength, comparing comparative example 3 with example 2 and finding that comparative example 3 lacks cellulose acetate butyrate powder and making comparative example 3 not as example 2 in compressive strength and flexural strength, comparing comparative example 4 with example 2 and finding that comparative example 4 is not as good as example 2 in compressive strength, and comparing comparative example 4 with example 2 and finding that comparative example 4 is not as good as example 2 in compressive strength and comparative example 4 is not as compared to example 2 in compressive strength, and comparing example 2 by not as compared to example 28 and comparing example 2 and finding that comparative example 2 is not as good as example 2 and comparing example 2 is not as compressive strength and as compared as example 28d and comparing example 2 and comparing comparative example 2 and comparing example 2 to find that comparative example 2 is not as good as compressive strength and as compared as example 2.
In summary, there are many factors affecting the compressive strength and flexural strength of concrete, in which the addition of polyacrylamide solution, magnesia powder, cellulose acetate butyrate powder, iron oxide powder and antioxidant to concrete has a great influence on the compressive strength and flexural strength of concrete, and the existing addition of iron ore tailings to concrete results in a decrease in compressive strength and flexural strength, whereas iron ore tailings in the present application cooperate with polyacrylamide solution, magnesia powder, cellulose acetate butyrate powder, so that example 2 has no compressive strength and flexural strength of iron ore tailings concrete at 28d because of comparative example 4.
1.2, Concrete samples prepared in examples 1 to 3 and comparative examples 1 to 5 were taken and placed in a container, respectively, and initial setting time and final setting time of the concrete samples prepared in examples 1 to 3 and comparative examples 1 to 4 were measured using a Vicat in an environment of-5 ℃.
TABLE 2 product Performance test
| Group of | Initial setting time/min | Final setting time/min |
| Example 1 | 50 | 155 |
| Example 2 | 45 | 150 |
| Example 3 | 48 | 150 |
| Comparative example 1 | 56 | 240 |
| Comparative example 2 | 65 | 245 |
| Comparative example 3 | 60 | 240 |
| Comparative example 4 | 45 | 160 |
| Comparative example 5 | 63 | 180 |
As shown in table 2 above, it can be seen from comparison that the initial setting time of the concrete prepared by the method of example 2 is the same as that of comparative example 4, but the final setting time is longer than that of example 2, so that it is explained that the initial setting time of the concrete is not affected but the final setting time of the concrete is affected without adding iron ore tailings, and the polyacrylamide solution, magnesia powder, cellulose acetate butyrate powder and iron ore tailings added in example 2 cooperate with each other, so that the final setting time of the concrete can be shortened.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (8)
1. The concrete based on the iron ore tailings is characterized in that the preparation raw materials of the concrete comprise the iron ore tailings, river sand, portland cement, tap water, binding liquid and a water reducing agent;
the adhesive liquid is prepared from, by weight, 20-30 parts of polyacrylamide solution, 3-6 parts of magnesia powder, 5-10 parts of resin, 20-25 parts of polypropylene fibers, 10-18 parts of antioxidants and 5-12 parts of cellulose acetate butyrate powder, and the water reducer is prepared from, by weight, 6-10 parts of montmorillonite powder, 10-15 parts of ferric oxide powder and 3-8 parts of corn starch.
2. The concrete based on the iron ore tailings, as claimed in claim 1, is prepared from the following raw materials, by weight, 20-35 parts of the iron ore tailings, 10-15 parts of river sand, 35-45 parts of Portland cement, 60-80 parts of tap water, 5-10 parts of an adhesive liquid and 8-15 parts of a water reducing agent.
3. The concrete based on iron ore tailings according to claim 2, wherein the polyacrylamide solution is prepared by placing polyacrylamide colloid in a container and stirring for 30-45min, adding pure water and mixing with the polyacrylamide colloid in the stirring process, and fully mixing to obtain the polyacrylamide solution, wherein the stirring speed is 60rpm.
4. A concrete based on iron ore tailings according to claim 3, wherein the mass ratio of polyacrylamide colloid to pure water is 1:5.
5. The concrete based on iron ore tailings, as claimed in claim 1, is characterized in that the resin is prepared by heating and fusing furfuryl alcohol resin and rosin to obtain the resin, and the antioxidant is prepared by mixing palmitic acid, magnesium stearate and glycerin, adding distilled water, and heating to 80-120 ℃.
6. The concrete based on iron ore tailings according to claim 5, wherein the resin is prepared from, by weight, 30-45 parts of furfuryl alcohol resin and 10-20 parts of rosin, and the antioxidant is prepared from, by weight, 20-35 parts of palmitic acid, 6-10 parts of magnesium stearate, 10-20 parts of glycerol and 50-60 parts of distilled water.
7. A method for preparing the iron ore tailing-based concrete according to any one of claims 1 to 6, comprising the steps of:
S1, heating a polyacrylamide solution to 100-120 ℃, stirring after the temperature is reached, wherein the stirring speed is 80rpm, stirring for 45-60min, adding magnesia powder and polypropylene fiber in the 10 th min of stirring, adding resin and cellulose acetate butyrate powder in the 20 th min of stirring, and finally adding an antioxidant in the 30 th min of stirring to obtain a bonding liquid;
S2, mixing montmorillonite powder, ferric oxide powder and corn starch, and grinding to 10-15nm through a grinding process to obtain a water reducer;
s3, adding the adhesive liquid into tap water, uniformly mixing to obtain a mixture, and putting the mixture into a cement mixer;
and S4, putting the iron ore tailings, the river sand and the acid salt cement into the cement mixer with the mixture in the step S3, stirring, adding the water reducer during stirring, and uniformly mixing to obtain the concrete.
8. The method for preparing concrete based on iron ore tailings according to claim 7, wherein the stirring time in the step S4 is 20-35min, and the stirring speed is 60rpm.
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Citations (6)
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