CN114573295A - Green iron tailing concrete with high carbonization resistance and preparation method thereof - Google Patents
Green iron tailing concrete with high carbonization resistance and preparation method thereof Download PDFInfo
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- CN114573295A CN114573295A CN202210219909.0A CN202210219909A CN114573295A CN 114573295 A CN114573295 A CN 114573295A CN 202210219909 A CN202210219909 A CN 202210219909A CN 114573295 A CN114573295 A CN 114573295A
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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
- 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
- C04B2111/22—Carbonation resistance
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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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Abstract
The invention belongs to the technical field of civil engineering construction building materials, and particularly relates to green iron tailing concrete with high carbonization resistance, and further discloses a preparation method of the green iron tailing concrete. According to the high-carbonization-resistance green iron tailing concrete, iron tailing powder is used as an admixture to partially replace cement to form a cementing material, and iron tailing sand and iron tailing stone are respectively used as a fine aggregate and a coarse aggregate, so that the prepared concrete material not only meets the standard in strength performance, but also is improved in carbonization resistance; in the whole concrete material, the utilization rate of the iron tailing waste can reach about 90%, the utilization rate of the iron tailing waste is greatly improved, and the method has the process advantage of environmental protection.
Description
Technical Field
The invention belongs to the technical field of civil engineering construction building materials, and particularly relates to green iron tailing concrete with high carbonization resistance, and further discloses a preparation method of the green iron tailing concrete.
Background
Concrete is widely used in the construction field, and the durability of concrete is always a key concern, and among many factors affecting the durability of concrete, the anti-carbonization performance is one of the most important indexes. Under normal conditions, a micro-crack and porous structure is formed in the concrete after pouring and curing, and carbon dioxide in the air can easily penetrate into the concrete through the cracks and the pores, so that the concrete is carbonized, the alkalinity of the concrete is reduced, the protection effect on internal reinforcing steel bars is lost, and the reinforcing steel bars are corroded. In the construction or road engineering, within the service life of a concrete structure, the number of engineering examples for damaging the building due to the corrosion of reinforcing steel bars caused by carbonization is not enough.
The traditional way for improving the anti-carbonization performance of concrete is mainly to use fly ash as mineral admixture, use gravel and river sand as coarse and fine aggregate to prepare concrete, and use fly ash as admixture to improve the anti-carbonization performance of concrete to a certain extent, but is not ideal. Moreover, with the large-scale application of concrete in the construction industry, the demand of raw materials such as cement, river sand, broken stone and the like is increased by times, so that the scales of sand mining and mountain digging broken stone of a river channel are increased, the ecological environment of a mountain and the river channel is damaged, and serious environmental pollution is caused. In addition, risk prompts in the concrete industry are issued by a plurality of provinces and cities, the prices of raw materials such as cement, fly ash and sandstone are increased to different degrees, and the raw materials are very short and cannot meet the supply and demand of the current concrete industry. In addition, as part of the proposals such as Chinese patent CN104446217A, alkali-activated metakaolin is used to partially replace fly ash as a mineral admixture to prepare concrete, so that high carbonization resistance can be realized to a certain extent, but the current situations that fly ash, river sand and gravel materials are in short supply and the environment is damaged by collecting river sand and gravel still cannot be solved. Moreover, as in the scheme of the chinese patent CN109748553A, river sand is replaced by residues obtained after the crushed stones are screened by a vibrating screen during the production of the mine, and the strength of the concrete reaches the strength grade of C45 through an additive, but substitutes for fly ash and crushed stones are not found, the environmental problems caused by the shortage of fly ash and crushed stone materials are still not solved, and the carbonization resistance of the fly ash and crushed stone materials is not researched. Therefore, the technical problem still exists how to realize the optimization of the anti-carbonization performance of the concrete at low cost.
At present, the application of the iron tailings in the field of concrete has been advanced to a certain extent, but the iron tailings are mainly used as admixture or fine aggregate or coarse aggregate to prepare concrete, and the comprehensive utilization is still not ideal. Therefore, the scheme tries to prepare the high-carbonization-resistance green concrete based on the iron tailing waste, not only solves the problem of insufficient carbonization resistance of the concrete, but also realizes the full utilization of the iron tailing waste.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the green iron tailing concrete with the strength grades of C30 and C40, which not only effectively reduces the occurrence of the phenomenon of building damage caused by lower carbonization resistance of the concrete, but also selects the iron tailings as concrete admixture, coarse aggregate and fine aggregate, fully utilizes the iron tailings while realizing the high carbonization resistance of the concrete, and solves the problems of available land reduction, surrounding environment pollution and the like caused by large accumulation of the iron tailings;
the second technical problem to be solved by the invention is to provide a preparation method of the green iron tailing concrete with high carbonization resistance.
In order to solve the technical problems, the raw materials of the green iron tailing concrete with high carbonization resistance provided by the invention per cubic meter comprise: 361kg of cement, 155kg of iron tailing powder 124, 785kg of iron tailing sand 746, 1084kg of iron tailing stone, 2.07-2.58kg of water reducing agent and 170kg of water.
Specifically, in each cubic meter of the concrete raw material, the mass ratio of the cement to the iron tailing powder is 1: 0.43.
specifically, the specific surface area of the iron tailing powder is 450m2/kg-550m2/kg。
Specifically, the iron tailing sand is sand material in the area II.
Specifically, the iron tailing ore is in 5-25mm continuous gradation.
Specifically, the cement is ordinary portland cement, and preferably, the cement is P · O42.5R ordinary portland cement.
Specifically, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, preferably a polycarboxylic acid high-efficiency water reducing agent with the solid content of 40% and the water reducing rate of 25%.
The invention also discloses a preparation method of the green iron tailing concrete with high carbonization resistance, which comprises the steps of fully mixing and stirring the cement, the iron tailing powder, the iron tailing sand, the iron tailing, the water reducing agent and water in selected proportioning amounts.
The invention also discloses application of the green iron tailing concrete with high carbonization resistance in the fields of building and road engineering.
According to the high-carbonization-resistance green iron tailing concrete, iron tailing powder is used as an admixture to partially replace cement to form a cementing material, and iron tailing sand and iron tailing stone are respectively used as fine aggregate and coarse aggregate, so that the prepared concrete material not only meets the standard in strength performance, but also is improved in carbonization resistance. In the concrete, the iron tailing powder has lower volcanic ash activity, and Ca (OH) consumed by the secondary hydration reaction of the concrete can be generated2The amount of the iron tailings is small, the alkalinity of the prepared concrete is high, and the compactness of the concrete can be improved by means of the good filling effect of the iron tailings powder; moreover, because the iron tailing sand and the iron tailing stone have higher water absorption rate, the water-cement ratio of the surrounding slurry can be reduced, the compactness of the concrete is improved, and the concrete is favorably improved by means of the indexes of smaller fineness modulus of the iron tailing sand and lower crushing value of the iron tailing stoneThe durability of the film. Therefore, the concrete provided by the invention not only has better strength performance and anti-carbonization performance, but also can completely replace high-cost materials such as river sand, broken stone and the like with iron tailing waste, and has higher economic value.
According to the high-carbonization-resistance green iron tailing concrete, iron tailing powder is preferably used as a concrete mineral admixture to replace 30% of cement, iron tailing sand and iron tailing stone respectively and completely replace river sand, and broken stone is used as fine aggregate and coarse aggregate, so that the concrete materials with strength grades of C30 and C40 are prepared and have high carbonization resistance. Compared with fly ash concrete with the same water-cement ratio, the green iron tailing concrete with high anti-carbonization performance of the invention has the advantages that the anti-carbonization performance of the C30 strength grade iron tailing concrete 28d is improved by 1.27 times, and the anti-carbonization performance of the C40 strength grade iron tailing concrete 28d is improved by 2.06 times; compared with the fly ash concrete with the same strength grade, the carbonization resistance of the C30 strength grade iron tailing concrete 28d is improved by 2.5 times, and the carbonization resistance of the C40 strength grade iron tailing concrete 28d is improved by 4.81 times. The green iron tailing concrete with high carbonization resistance has higher alkali content and better compactness, and the carbonization resistance of the concrete is greatly improved.
According to the concrete disclosed by the invention, the iron tailing powder is used as an admixture to replace cement to form a cementing material, and the iron tailing sand and the iron tailing stone are respectively used as a fine aggregate and a coarse aggregate, so that the strength of the obtained concrete material completely reaches the standard, and the anti-carbonization performance is greatly improved. The concrete provided by the invention takes the iron tailing waste as a raw material, can completely replace high-cost raw materials such as river sand and gravel used in the traditional concrete material, and the utilization rate of the iron tailing waste in the whole concrete material can reach about 90%, so that the utilization rate of the iron tailing waste is greatly improved, a series of problems caused by the accumulation of a large amount of iron tailings are effectively reduced, the current situation that the fly ash, the river sand and the gravel are relatively deficient is relieved, the problems of environmental damage and pollution caused by the exploitation of the river sand and the gravel are effectively solved, and the concrete has the process advantage of environmental protection.
Drawings
In order that the present disclosure may be more readily and clearly understood, the following detailed description of the present disclosure is provided in connection with specific embodiments thereof and the accompanying drawings, in which,
FIG. 1 is a comparison result of the carbonization depths of the concrete of the present invention and the fly ash concrete with the same water-cement ratio in different ages in the prior art; wherein (a) in fig. 1 is the result of comparing the concrete products of example 1 and comparative example 1 (water-cement ratio is 0.41), and (b) in fig. 1 is the result of comparing the concrete products of example 2 and comparative example 3 (water-cement ratio is 0.33);
FIG. 2 is the results of the carbonization depth comparison of the concrete of the present invention and the fly ash concrete of the same strength grade in different ages in the prior art; wherein (a) in fig. 2 is the result of comparing the concrete products of example 1 and comparative example 2 (strength grade C30), and (b) in fig. 2 is the result of comparing the concrete products of example 2 and comparative example 4 (strength grade C40);
FIG. 3 is a scanning electron microscope image of standard curing for 28d of the green iron tailing concrete with high carbonization resistance prepared in example 2 and the fly ash concrete with the same water-cement ratio (the water-cement ratio is 0.33) in comparative example 3; wherein (a) in FIG. 3 is a product of comparative example 3, and (b) in FIG. 3 is a product of example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
In the following embodiments of the invention, the selected raw materials include:
cement: the actual measurement of 28d compressive strength of ordinary Portland cement P.O 42.5R cement is 52.5 MPa;
the iron tailing powder, the iron tailing sand and the iron tailing ore are all obtained from the garden town of Cai of Qian' an city, Hebei province, are all industrial waste residues after mineral separation, and are obtained after water washing and screening;
iron tailing powder: after being ground by a ball mill, the specific surface area is 450m2/kg-550m2Powder in the range of/kg, in the scheme of the invention, the iron tailings powder is used as an admixture;
iron tailing sand: the fineness modulus is 2.4, the water absorption is 2.36%, and the sand in the area II is used as fine aggregate in the scheme of the invention;
iron tailings: 5-25mm continuous gradation, the crushing index is 6%, and the water absorption is 0.8%, in the scheme of the invention, the iron tailing stone is used as coarse aggregate;
water reducing agent: the polycarboxylic acid high-efficiency water reducing agent has the solid content of 40 percent and the water reducing rate of 25 percent;
water: municipal water.
Example 1
In the embodiment, the raw materials of the green iron tailing concrete with high carbonization resistance per cubic meter comprise: 290kg of cement, 124kg of iron tailing powder, 785kg of iron tailing sand, 1084kg of iron tailing stone, 2.07kg of water reducing agent and 170kg of water. Of the above raw materials, cement and iron ore tailings as admixture form a gel material (total 414kg), and the required concrete is obtained by fully mixing and stirring the raw materials.
Through detection, the strength grade of the concrete is C30, and the substitution ratio of the iron tailing powder to the cement is 30%.
Example 2
In the embodiment, the raw materials of the green iron tailing concrete with high carbonization resistance per cubic meter comprise: 361kg of cement, 155kg of iron tailing powder, 746kg of iron tailing sand, 1030kg of iron tailing stone, 2.58kg of water reducing agent and 170kg of water. Of the above raw materials, cement and iron ore tailings powder as admixture form a gel material (total 516kg), and the required concrete is obtained by fully mixing and stirring the raw materials.
Through detection, the strength grade of the concrete is C40, and the substitution ratio of the iron tailing powder to the cement is 30%.
Comparative example 1
The raw materials and preparation method of the concrete in the comparative example are the same as those in example 1, and the difference is that fly ash is used for replacing the iron tailing powder, and river sand and common crushed stone are used for replacing the iron tailing sand and the iron tailing ore respectively.
Comparative example 2
The raw materials and the preparation method of the concrete in the comparative example are the same as those in example 1, and the difference is that the fly ash is used for replacing the iron tailing powder, river sand and common crushed stone are respectively used for replacing the iron tailing sand and the iron tailing ore in equal amount, and the mass ratio of the cement to the fly ash is controlled to be 1: in the case of 0.43, the dosage of the cement and the fly ash are adjusted in the same ratio, namely, the strength value of the product is adjusted to be basically the same as that of the embodiment 1 by changing the water-cement ratio of the system under the condition of keeping the consistent dosage of the water, namely, the strength grade of the obtained concrete is controlled to be C30.
Comparative example 3
The raw materials and the preparation method of the concrete in the comparative example are the same as those in example 2, and the difference is that the iron tailing powder is replaced by fly ash, and river sand and common crushed stone are respectively used for completely replacing iron tailing sand and iron tailing ore.
Comparative example 4
The raw materials and the preparation method of the concrete in the comparative example are the same as those in example 2, and the difference is that the fly ash is used for replacing the iron tailing powder, river sand and common crushed stone are respectively used for replacing the iron tailing sand and the iron tailing ore in equal amount, and the mass ratio of the cement to the fly ash is controlled to be 1: in the case of 0.43, the dosage of the cement and the fly ash are adjusted in the same ratio, namely, the strength value of the product is adjusted to be basically the same as that of the embodiment 2 by changing the water-cement ratio of the system under the condition of keeping the dosage of the water consistent, namely, the strength grade of the obtained concrete is controlled to be C40.
Examples of the experiments
According to the regulations of the rapid carbonization test in GB/T50082-plus 2009 Standard test method for Long-term Performance and durability of ordinary concrete, the concrete prepared according to the schemes of examples 1-2 and comparative examples 1-4 is prepared into a plurality of prismatic test blocks of 100mm multiplied by 400mm, after standard curing for 28 days in an environment with the relative temperature of 20 +/-2 ℃ and the relative humidity of not less than 95 percent, the test blocks are continuously dried for 48 hours in a constant-temperature drying box at 60 ℃, then paraffin is coated on the surfaces of the test blocks and then the test blocks are placed into a rapid carbonization box, the temperature in the carbonization box is kept at 20 +/-2 ℃, the relative humidity is 70 +/-5 ℃, and CO is maintained at 20 +/-2 DEG2The concentration is 20 plus or minus 3 percent; after the predetermined age (3d, 7d, 14d, 28d), the test piece was taken out, and the carbonization depth was measured, and the test results are shown in table 1 below and fig. 1 to 2.
TABLE 1 carbonization test results
As can be seen from the data of the example 1 and the comparative example 1 in the table above, compared with the fly ash concrete with the same water-cement ratio (0.41: 1) in the prior art, the strength grade of the green iron tailing concrete with high carbonization resistance prepared by the invention reaches C30, the 28d carbonization depth is reduced by 21.47%, and the carbonization resistance is improved by 1.27 times.
As can be seen from the data of the example 1 and the comparative example 2 in the table above, compared with the fly ash concrete with the same strength grade (C30) in the prior art, the 28d accelerated carbonization depth of the green iron tailing concrete with high carbonization resistance is reduced by 60%, and the carbonization resistance is improved by 2.5 times.
As can be seen from the data of the example 2 and the comparative example 3 in the table above, compared with the fly ash concrete with the same water-cement ratio (0.33: 1) in the prior art, the strength grade of the green iron tailing concrete with high carbonization resistance prepared by the invention reaches C40, the 28d accelerated carbonization depth is reduced by 50.73%, and the carbonization resistance is improved by 2.06 times.
As can be seen from the data of the example 2 and the comparative example 4 in the table above, compared with the fly ash concrete with the same strength grade (C40) in the prior art, the 28d carbonization depth of the green iron tailing concrete with high carbonization resistance prepared by the invention is reduced by 79.24%, and the carbonization resistance is improved by 4.81 times.
Scanning electron microscope tests are carried out on the high-carbonization-resistance green iron tailing concrete with the strength grade of C40 and standard curing for 28d, the results are shown in figure 3, and the test results show that the size and the number of pores in the high-carbonization-resistance green iron tailing concrete are smaller than those of the fly ash concrete with the same water-cement ratio in the comparative example, and the concrete prepared by the method is proved to have higher compactness.
In conclusion, the concrete disclosed by the invention uses the iron tailing powder as an admixture to replace cement to form a cementing material, and uses the iron tailing sand and the iron tailing stone as a fine aggregate and a coarse aggregate respectively, so that the strength of the obtained concrete material completely reaches the standard, and the anti-carbonization performance is greatly improved. The concrete provided by the invention takes the iron tailing waste as a raw material, can completely replace high-cost raw materials such as river sand, broken stone and the like used in the traditional concrete material, the utilization rate of the iron tailing waste in the whole concrete material can reach about 90%, the utilization rate of the iron tailing waste is greatly improved, a series of problems caused by the accumulation of a large amount of iron tailings are effectively reduced, the current situation that the fly ash, the river sand and the broken stone are relatively lack is relieved, the problems of environmental damage and pollution caused by the exploitation of the river sand and the broken stone are effectively solved, and the concrete has the process advantage of environmental protection.
The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. The green iron tailing concrete with high carbonization resistance is characterized in that the raw materials per cubic meter of the concrete comprise: 361kg of cement, 155kg of iron tailing powder 124, 785kg of iron tailing sand 746, 1084kg of iron tailing stone, 2.07-2.58kg of water reducing agent and 170kg of water.
2. The high-carbonization-resistance green iron tailing concrete as claimed in claim 1, wherein the mass ratio of the cement to the iron tailing powder is 1: 0.43.
3. the green iron tailing concrete with high carbonization resistance according to claim 1 or 2, wherein the specific surface area of the iron tailing powder is 450m2/kg-550m2/kg。
4. The green iron tailing concrete with high carbonization resistance according to any one of claims 1 to 3, wherein the iron tailing sand is a sand material in zone II.
5. The high carbonization resistance green iron tailing concrete according to any one of claims 1 to 4, wherein the iron tailing ore is in 5-25mm continuous gradation.
6. The green iron tailing concrete with high carbonization resistance according to any one of claims 1 to 5, wherein the cement is ordinary portland cement.
7. The green iron tailing concrete with high carbonization resistance according to any one of claims 1 to 6, wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
8. The preparation method of the green iron tailing concrete with the high carbonization resistance as claimed in any one of claims 1 to 7, is characterized by comprising the step of fully mixing and stirring the cement, the iron tailing powder, the iron tailing sand, the iron tailing ore, the water reducing agent and water in selected proportion.
9. The application of the green iron tailing concrete with high carbonization resistance as defined in any one of claims 1 to 7 in the fields of building and road engineering.
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