CN110698098A - Corrosion-resistant iron tailing aggregate, corrosion-resistant concrete and preparation method thereof - Google Patents
Corrosion-resistant iron tailing aggregate, corrosion-resistant concrete 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
- 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
- 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
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- 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
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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
- C04B2111/2015—Sulfate resistance
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- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- Y02W30/00—Technologies for solid waste management
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Abstract
The invention discloses an anti-corrosion iron tailing aggregate, anti-corrosion concrete and a preparation method thereof, and belongs to the technical field of concrete production technology. The technical scheme is characterized in that the corrosion-resistant iron tailing aggregate comprises the following components: six grades of tailing stones with the grain sizes of 25-27mm, 18-20mm, 15-17mm, 8-10mm, 4-5mm and 2-3 mm; the mass percentages of the various levels of the compound tailings are respectively 4-6%, 18-22%, 24-26%, 18-22% and 4-6%, so that the void ratio of the aggregates can be obviously reduced, the compactness of the iron tailing aggregates is higher, and the effect of enhancing the corrosion resistance of the iron tailing aggregates is achieved. The invention also discloses corrosion-resistant concrete which comprises the corrosion-resistant iron tailing aggregate, and the corrosion resistance, the falling resistance and the durability of the concrete are enhanced.
Description
Technical Field
The invention relates to the technical field of concrete production technology, in particular to an anti-corrosive iron tailing aggregate, an anti-corrosive concrete and a preparation method thereof.
Background
The iron tailings are wastes after mineral separation and are the main components of industrial solid wastes. In the present situation that iron tailings are applied to the technical field of concrete production in China, the iron tailings are mostly used as substitutes of concrete fine aggregates, and the substitution rate is limited. For example, chinese patent CN107399948A discloses a high strength concrete doped with iron tailings with an iron tailings replacement rate of about 22%. The method for preparing the iron tailing concrete partially or completely replacing natural aggregate disclosed by the Chinese patent CN101671146A only uses ore dressing waste stones as concrete aggregates after cleaning, crushing and screening.
At present, the experimental research on iron tailing concrete at home and abroad mainly focuses on mechanical properties, and has little corrosion resistance. The traditional corrosion-resistant concrete generally changes the type of cementing materials or the formula of additives to improve the corrosion resistance of the concrete. Chinese patent CN201910283559.2 discloses an impervious iron tailing concrete, which is prepared by replacing common concrete coarse aggregate with iron tailing balls, replacing fine aggregate with iron tailing powder, and adding additives, water and water reducing agent. Because the iron tailing powder in the patent has uncontrollable indexes of fineness, mud content and harmful substances in the application process, the quality of concrete is easy to fluctuate, and the corrosion resistance of the impervious iron tailing concrete is particularly influenced. In order to effectively improve the corrosion resistance of the iron tailing concrete, the iron tailing aggregate for the corrosion-resistant concrete needs to be developed urgently.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the following steps: the corrosion-resistant concrete is provided, and the effect of enhancing the corrosion resistance of the iron tailing aggregate is achieved by adjusting the grading of the tailing and the mixing proportion.
The first purpose of the invention is realized by the following technical scheme: the corrosion-resistant iron tailing aggregate comprises the following components: six grades of tailing stones with the grain sizes of 25-27mm, 18-20mm, 15-17mm, 8-10mm, 4-5mm and 2-3 mm; the mass percentages of the ore with the matched tails at all levels are respectively 4-6%, 18-22%, 24-26%, 18-22% and 4-6%.
Gradation is a proportional relationship representing the mutual arrangement of the aggregate size particles.
By adopting the scheme, the tailing stones with different grain sizes in the iron tailings are mixed according to continuous gradation and a specific proportion to form the iron tailing aggregate, so that the void ratio of the aggregate can be obviously reduced, the compactness of the iron tailing aggregate is higher, the invasion of corrosive media is effectively reduced, and the corrosion resistance of the iron tailing aggregate is further enhanced.
The invention also aims to provide corrosion-resistant concrete, which comprises the corrosion-resistant iron tailing aggregate.
Concrete aggregate is an important component of concrete and plays a role in skeleton and filling in concrete.
The amount of cementitious material is the sum of the mass of cement and admixture per cubic meter of concrete.
Through adopting above-mentioned scheme, in being applied to the concrete with corrosion resistance iron tailing aggregate, on the one hand, the porosity of above-mentioned corrosion resistance iron tailing aggregate is low, and closely knit degree is high, and is more closely knit with the gel material combination in the concrete, can also reduce the cement quantity and guarantee closely knit degree, reduces the possibility that corrosive substance got into the concrete, strengthens corrosion resistance, anti falling nature and the durability of concrete. On the other hand, the total surface area of the corrosion-resistant iron tailing aggregate is small, so that the water requirement for wetting the surface of the aggregate and the using amount of a cementing material can be reduced, water resources are saved, the cost of the cementing material of concrete is reduced, and the profit margin is improved.
In addition, the quality acceptance method of the iron tailing aggregate entering the factory is simple, and the quality of the iron tailing aggregate is checked only by visual observation or by simple tests such as water content, needle shape and the like, so that the quality of the raw material has controllability, and the concrete quality is not easy to deviate and fluctuate.
The water content reflects the drying degree of the aggregate, and the accurate measurement of the water content of the aggregate can facilitate the adjustment of the actual water consumption in concrete mixing according to the water content of the aggregate in the later period. The needle sheet shape reflects the overall shape of the aggregate, and the shape of the aggregate has a certain influence on the strength of the concrete. The needle-shaped aggregate is inclined to be arranged in one direction, so that the friction force of the fresh concrete in the flowing process is increased, the fresh concrete is not easy to vibrate and compact, the stress is easy to break, and the strength of the concrete is reduced.
The invention is further configured to: the paint comprises the following components in parts by weight: 400 portions of cement, 70-100 portions of mineral powder, 750 portions of tailing sand, 150 portions of stone dust, 1100 portions of corrosion-resistant iron tailing aggregate and 180 portions of water.
By adopting the scheme, the components in the corrosion-resistant concrete are optimized to comprise cement, mineral powder, tailing sand, stone chips, corrosion-resistant iron tailing aggregate, water and the weight parts of the components, so that the cooperation synergistic effect of the corrosion-resistant iron tailing aggregate and other components in the concrete can be further improved, the compactness of the concrete is improved, and the concrete achieves higher corrosion resistance.
In addition, by doping the corrosion-resistant iron tailing aggregate, the fluidity, the cohesiveness and the water-retaining property of the corrosion-resistant concrete are improved. And moreover, the iron tailings are made into the sandstone and applied to the concrete building, so that on one hand, the pollution of the iron tailings and the waste rocks to the environment is reduced, the exploitation energy consumption of the natural sandstone is reduced, the resources are saved, and the environment is protected. On the other hand, the iron tailing sandstone has low cost, and the main material cost of the corrosion-resistant concrete can be reduced by replacing natural sandstone in the application process, so that the profit margin is improved.
The invention is further configured to: also comprises 100 portions of mineral preservative agent and 150 portions of mineral preservative agent, wherein the mineral preservative agent comprises fly ash, silicon dioxide powder and Al2O3And (3) powder.
It is to be noted thatAl as described above2O3The powder is Al2O3And (3) ultrafine powder. The cement is ordinary portland cement. After ordinary portland cement hardens, the hydration product contains about 10-15% Ca (OH)2。
By adopting the scheme, the mineral preservative is prepared from fly ash, silicon dioxide powder and Al2O3The main activities of the mineral preservative are active silica and active alumina, in Ca (OH)2The solution can absorb calcium ions to form gelled substances such as calcium silicate hydrate and calcium aluminate hydrate, and the hydrates can be coagulated and hardened in air and can be further hardened in water, and have considerable strength. The mineral preservative can also play a roll ball role, a flocculation breaking role and a compaction role in the concrete, so that the water consumption of the concrete is reduced, the workability is improved, and the compactness is improved; meanwhile, the mineral preservative is uniformly distributed in the cement slurry, so that the structural strength of the hardened slurry can be enhanced, the uniformity of concrete is changed, and pores and capillary holes of the concrete are filled and refined, thereby reducing the invasion path of corrosive media and enhancing the anti-erosion capability of the concrete. The corrosion resistance of the concrete can be further improved by adding the mineral preservative into the corrosion-resistant concrete.
In addition, a certain amount of mineral preservative is added into the corrosion-resistant concrete, so that the compactness of the set cement is improved, the mixing amount of the additive is reduced, and the cost is saved.
The invention is further configured to: among the mineral preservatives, fly ash, silicon dioxide powder and Al2O3The mass percentages of the powder are respectively 15-20%, 60-65% and 20-25%.
By adopting the scheme, the fly ash, the silicon dioxide powder and the Al in the mineral preservative are preferably selected2O3The matching of the three components of the powder can further enhance the matching use effect of the three components, thereby enhancing the corrosion resistance of the mineral preservative in concrete.
The invention is further configured to: the fly ash is selected from grade I; the particle size of the silicon dioxide powder is 0.1-0.3 mu m; the Al is2O3The particle size of the powder is 0.5-2 μm.
With reference to the standard in GB/T1596-2005 fly ash for use in cement and concrete, class I fly ash is preferably used. Al (Al)2O3The powder is Al2O3Ultra-fine powder of Al2O3The percentage of the activity value intensity is 75-85%. The grain size range of the superfine powder is 0.5-2 mu m, the average grain size is less than or equal to 1.21 mu m, and the specific surface area is more than or equal to 2490m2Perkg, water requirement ratio < 95%, Cl-The content is less than or equal to 0.01 percent, the activity index in 7 days is more than or equal to 85 percent, and the activity index in 28 days is more than or equal to 110 percent.
By adopting the scheme, the grade of the fly ash, the particle size of the silicon dioxide powder and Al are preferably selected2O3Some performance parameters of the powder are limited, so that the components of the mineral preservative are further optimized, the matching use effect of the three components is further enhanced, and the corrosion resistance of the mineral preservative in concrete is further enhanced.
The invention is further configured to: the cement mineral powder water reducer also comprises a polycarboxylic acid high-efficiency water reducer, wherein the weight of the polycarboxylic acid high-efficiency water reducer accounts for 1.9-2.2% of the total weight of the cement, the mineral powder and the mineral preservative.
It is to be noted that the gel material herein includes the total mass of the above-mentioned three components of cement, mineral powder and mineral preservative. Therefore, the weight of the polycarboxylic acid high-efficiency water reducing agent in the corrosion-resistant concrete is 1.9-2.2% of that of the concrete gel material.
By adopting the scheme, the weight ratio of the water reducing agent to the concrete gel material is optimized, so that the early hydration degree of the gel material can be improved, the appearance of a cement hydration product is changed, the slurry microstructure is improved, the strength of hardened slurry is improved, and the compressive strength and the durability of concrete are further improved.
The invention is further configured to: the water-cement ratio of the corrosion-resistant concrete is 0.35-0.45.
The water-cement ratio of the concrete refers to the ratio of water consumption per cubic meter of the concrete to the amount of the used cementing material. The water-to-gel ratio here shown refers to the ratio of the mass of the water to the total mass of the three components cement, mineral powder and mineral preservative.
The water-cement ratio is a main factor for determining the structure and performance of cement concrete, and the influence on the structure is mainly reflected in three aspects, namely, the composition and the structure of a cement concrete hydration product are determined; secondly, determining the micro-pore structures of the cement concrete, such as gel pores, capillary pores, air pores and the like; thirdly, the bonding interface between the set cement and the aggregate determines the strength of the concrete material to a great extent. If the water-to-gel ratio is too large, the fluidity is increased, but the cohesiveness is deteriorated, and segregation and bleeding are liable to occur. The water-to-glue ratio is too small, the fluidity of concrete is poor, the pumping of the sheet is affected, and the construction is not easy.
By adopting the scheme, the water-cement ratio of the concrete is optimized, so that the composition and the structure of a cement concrete hydration product can be optimized, the strength, the corrosion resistance and the durability of the concrete are further enhanced, and the transportation and the construction are convenient.
The invention is further configured to: the sand rate of the corrosion-resistant concrete is 0.39-0.52.
The sand ratio is the ratio of the mass of sand to the total mass of sand and stone in the concrete.
Herein, the sand ratio in the corrosion-resistant concrete means a ratio of the mass of the tailings sand to the total mass of the tailings sand, the stone chips and the corrosion-resistant iron tailings aggregate.
Variations in sand ratio can cause significant changes in the total surface area of the aggregate, thereby having a greater impact on the workability of the concrete mix. Under the condition of certain cement consumption and water cement ratio, the mortar formed by the sand and the cement paste plays roles of lubrication and roller beads among the coarse aggregates, so that the friction among the coarse aggregates can be reduced, and the fluidity of the concrete is increased along with the increase of the sand rate in a certain range. On the other hand, as the specific surface area of the sand is larger than that of the coarse aggregate, the total surface area of the aggregate is increased along with the increase of the sand rate, and under the condition of a certain cement paste dosage, the paste amount wrapped on the surface of the aggregate is reduced, the lubricating effect is reduced, and the fluidity of the concrete is reduced. Therefore, the sand ratio exceeds a certain range, and the fluidity decreases as the sand ratio increases. The sand rate is too low, the cohesiveness and the water-retaining property of the concrete are reduced, and the phenomena of bleeding, segregation and flow discharge are easy to generate. When the sand rate is too high and cement paste is not enough to wrap the surface of the aggregate, the cohesiveness is reduced.
By adopting the scheme, the sand rate is optimized, the tailing sand can fill the gaps between the stone chips and the corrosion-resistant iron tailing aggregate and has a certain margin, and a mortar layer with a certain thickness can be formed between the stone chips and the corrosion-resistant iron tailing aggregate so as to reduce the friction resistance between the aggregates, so that the concrete fluidity reaches the maximum value, and further the workability of the concrete is enhanced.
The third purpose of the invention is that: the preparation method of the corrosion-resistant concrete comprises the following steps: s1, screening and selecting the tailing stones according to the grading of 25-27mm, 18-20mm, 15-17mm, 8-10mm, 4-5mm and 2-3mm, and respectively matching the tailing stones according to the mass percentages of 4-6%, 18-22%, 24-26%, 18-22% and 4-6% to prepare the corrosion-resistant iron tailing aggregate;
s2, uniformly mixing 750 parts by weight of tailing sand and 300 parts by weight of stone dust and 150 parts by weight of stone dust; then adding 150-400 parts of cement, 70-100 parts of mineral powder, 150 parts of mineral preservative and 800-1100 parts of the corrosion-resistant iron tailing aggregate prepared in the step S1 in sequence, and uniformly mixing for 50-80 seconds; finally adding 1800 portions of water 160-plus and 6.08-1.43 portions of polycarboxylic acid high-efficiency water reducing agent, and uniformly mixing for 100-plus 150 seconds to obtain the corrosion-resistant concrete.
By adopting the scheme, in the preparation process of the corrosion-resistant concrete, tailing sand and stone chips (used as aggregates) are added firstly during the stirring of the concrete, then cement, mineral powder, mineral preservative (used as powder) and corrosion-resistant iron tailing aggregates are added, and finally, the water reducing agent and water are added or reduced, so that the cement, mineral powder, mineral preservative and aggregates in the cementing material can be fully and uniformly stirred, the overall compactness of the concrete is further enhanced, the possibility of corrosive substances entering the concrete is reduced, and the corrosion resistance, the falling resistance and the durability of the concrete are enhanced. In addition, the preparation method of the corrosion-resistant concrete is simple in process and has sustainable popularization.
In conclusion, the invention has the following beneficial effects:
1. according to the invention, the corrosion-resistant iron tailing aggregate is prepared by preferably mixing the tailing stones with different particle sizes in the iron tailing according to continuous gradation and a specific proportion, so that the void ratio of the aggregate can be obviously reduced, the compactness of the iron tailing aggregate is higher, the invasion of a corrosion medium is effectively reduced, and the corrosion resistance of the iron tailing aggregate is enhanced;
2. according to the invention, the corrosion-resistant concrete adopts the corrosion-resistant iron tailing aggregate, the aggregate is combined with a gel material in the concrete more compactly, the cement consumption can be reduced, the compactness can be ensured, the possibility of corrosive substances entering the concrete can be reduced, and the corrosion resistance, the falling resistance and the durability of the corrosion-resistant concrete can be further enhanced;
3. in the invention, the iron tailings are made into the sand stone to be applied to the concrete building, thereby reducing the pollution of the mineral waste stone to the environment, reducing the exploitation amount and the exploitation energy consumption of natural sand stone materials, reducing the production cost, meeting the requirements of the building market on concrete products and the performance thereof, and having important significance;
4. according to the preparation method of the corrosion-resistant concrete, the cementing material and the aggregate are fully and uniformly stirred, so that the overall compactness of the concrete is enhanced, the possibility of corrosive substances entering the concrete is reduced, and the corrosion resistance, the falling resistance and the durability of the concrete are enhanced. In addition, the preparation method of the corrosion-resistant concrete is simple in process and has sustainable popularization.
Detailed Description
The present invention will be described in further detail below.
Example 1
The corrosion-resistant iron tailing aggregate comprises the following components: six graded tailing stones with the grain sizes of 25mm, 20mm, 15mm, 10mm, 4mm and 3 mm;
the mass percentages of the ore with the matched tails at all levels are respectively 4%, 22%, 24%, 26%, 18% and 6%.
Example 2
The corrosion-resistant iron tailing aggregate comprises the following components: six graded tailing stones with the grain sizes of 27mm, 18mm, 17mm, 8mm, 5mm and 2 mm;
the mass percentages of the various grades of match tail ores are respectively 6%, 18%, 26%, 24%, 22% and 4%.
Example 3
The corrosion-resistant iron tailing aggregate comprises the following components: six grades of tailing stones with the grain sizes of 26.5mm, 19.0mm, 16.0mm, 9.5mm, 4.75mm and 2.36 mm;
the mass percentages of the various grades of matched tailing ores are respectively 5%, 20%, 25%, 20% and 5%.
Example 4
A corrosion resistant iron tailing aggregate differing from example 3 in that the six grades of tailing ore differ in particle size by 26mm, 18mm, 15.5mm, 9mm, 4.5mm and 2.5mm respectively.
Example 5
A corrosion resistant iron tailing aggregate is different from example 3 in that the mass percentages of six graded tailing stones are different, and are respectively 6%, 19%, 26%, 24%, 21% and 4%.
Comparative example 1
The iron tailing aggregate comprises the following components: tailings stones with three grades of particle sizes of 26.5mm, 16.0mm and 2.36 mm; the mass percentages of the ore with the matched tails at all levels are respectively 30%, 30% and 60%.
Comparative example 2
An iron tailing aggregate, natural tailing, is randomly selected.
The basic performance parameters of the iron tailing aggregates provided in examples 1-5 and comparative examples 1-2 were tested, and the test results are shown in table 1.
TABLE 1 basic Performance parameters of iron tailings aggregates
| Experimental group | Apparent density kg/m3 | Content of mud% | Needle-shaped% |
| Example 1 | 2673 | 1.1 | 3 |
| Example 2 | 2671 | 1.2 | 3 |
| Example 3 | 2680 | 0.7 | 2 |
| Example 4 | 2681 | 0.8 | 3 |
| Example 5 | 2675 | 1.0 | 3 |
| Comparative example 1 | 2573 | 1.6 | 6 |
| Comparative example 2 | 2810 | 1.8 | 8 |
As can be seen from the data in table 1, the iron tailing aggregates provided in example 3 both had better mud content and better pin-sheet-like performance parameters than those of examples 1-2 and examples 4-5. Example 4 differs from example 3 in that the particle size of the tailings is adjusted; the difference between the example 5 and the example 3 is that the mixing proportion of the tailings with different grades is adjusted, which shows that the grain size grading of the tailings and the mixing proportion between the tailings with different grades influence the mud content and the needle sheet rate of the iron tailing aggregate, and further influence the corrosion resistance and the pressure resistance of the iron tailing aggregate.
The aggregate performance parameters of the comparative examples 1-2 are obviously not as good as the improved mud content and needle-like performance parameters of the iron tailing aggregate of the example 3. The difference between the comparative example 1 and the example 3 is that only three kinds of tailing stones with discontinuous gradation are selected as aggregates; comparative example 2 is natural tailings stone without any grading selection, showing that the continuous grading of the aggregates and the specific mixing ratio affect the mud content and needle flake rate of the iron tailings aggregates.
Although the apparent densities of examples 1 to 5 were not as high as those of the natural aggregate of comparative example 2, the higher mud content and high pin fraction of comparative example 2 seriously affected the anti-corrosive and compressive properties of the aggregate, and in sum, the properties of examples 1 to 5 were significantly better than those of the natural aggregate provided in comparative example 2.
Example 6
The corrosion-resistant concrete comprises the following components in parts by weight: 150 parts of ordinary portland cement, 100 parts of mineral powder, 100 parts of mineral preservative, 750 parts of tailing sand, 150 parts of stone chips, 1100 parts of corrosion-resistant iron tailing aggregate, 6.65 parts of polycarboxylic acid high-efficiency water reducing agent and 180 parts of water;
the mineral preservative comprises 15% of fly ash, 65% of silicon dioxide powder and Al in percentage by mass2O320% of powder; the fly ash is grade I, the particle size of the silicon dioxide powder is 0.1 mu m, and Al is used2O3The grain size of the superfine powder is 0.5 mu m;
wherein the weight of the polycarboxylic acid high-efficiency water reducing agent accounts for 1.9 percent of the total weight of the gel material, the water-gel ratio is 0.51, and the sand rate is 0.375; the corrosion resistant iron tailing aggregate was provided in example 3;
the preparation method comprises the following steps:
(a) according to the formula amount, evenly mixing the tailing sand and the stone chips;
(b) sequentially adding the ordinary Portland cement, the mineral powder, the mineral preservative and the corrosion-resistant iron tailing aggregate according to the formula ratio, and uniformly mixing for 50 s;
(c) and finally, adding water and a polycarboxylic acid high-efficiency water reducing agent according to the formula ratio, and uniformly mixing for 150 seconds to obtain the corrosion-resistant concrete.
Example 7
The corrosion-resistant concrete comprises the following components in parts by weight: 400 parts of ordinary portland cement, 70 parts of mineral powder, 150 parts of mineral preservative, 450 parts of tailing sand, 300 parts of stone chips, 800 parts of corrosion-resistant iron tailing aggregate, 13.64 parts of polycarboxylic acid high-efficiency water reducing agent and 160 parts of water;
the mineral preservative comprises 20% of fly ash, 60% of silicon dioxide powder and Al in percentage by mass2O320% of powder; the fly ash is grade I, the particle size of the silicon dioxide powder is 0.3 mu m, and Al is used2O3The grain diameter of the superfine powder is 2 mu m;
wherein the weight of the polycarboxylic acid high-efficiency water reducing agent accounts for 2.2 percent of the total weight of the gel material, the water-gel ratio is 0.26, and the sand rate is 0.29; the corrosion resistant iron tailing aggregate was provided in example 3;
the preparation method comprises the following steps:
(a) according to the formula amount, evenly mixing the tailing sand and the stone chips;
(b) sequentially adding the ordinary Portland cement, the mineral powder, the mineral preservative and the corrosion-resistant iron tailing aggregate according to the formula ratio, and uniformly mixing for 80 s;
(c) and finally, adding water and the polycarboxylic acid high-efficiency water reducing agent according to the formula ratio, and uniformly mixing for 100s to obtain the corrosion-resistant concrete.
Example 8
The corrosion-resistant concrete comprises the following components in parts by weight: 300 parts of ordinary portland cement, 80 parts of mineral powder, 120 parts of mineral preservative, 750 parts of tailing sand, 180 parts of stone chips, 850 parts of corrosion-resistant iron tailing aggregate, 10 parts of polycarboxylic acid high-efficiency water reducing agent and 180 parts of water;
the mineral preservative comprises 15% of fly ash, 60% of silicon dioxide powder and Al in percentage by mass2O325% of powder; the fly ash is grade I, the particle size of the silicon dioxide powder is 0.2 mu m, and Al is used2O3The grain diameter of the superfine powder is 1 mu m;
wherein the weight of the polycarboxylic acid high-efficiency water reducing agent accounts for 2 percent of the total weight of the gel material, the water-gel ratio is 0.36, and the sand rate is 0.42; the corrosion resistant iron tailing aggregate was provided in example 3;
the preparation method comprises the following steps:
(a) according to the formula amount, evenly mixing the tailing sand and the stone chips;
(b) sequentially adding the ordinary Portland cement, the mineral powder, the mineral preservative and the corrosion-resistant iron tailing aggregate according to the formula ratio, and uniformly mixing for 60 s;
(c) and finally, adding water and the polycarboxylic acid high-efficiency water reducing agent according to the formula ratio, and uniformly mixing for 120s to obtain the corrosion-resistant concrete.
Example 9
An anti-corrosive concrete was distinguished from example 8 in that 15 parts of a polycarboxylic acid high-efficiency water reducing agent was adjusted so that the weight of the polycarboxylic acid high-efficiency water reducing agent was 3% by weight of the total weight of the gel material.
Example 10
An anti-corrosive concrete was distinguished from example 8 in that 0.5 part of a polycarboxylic acid high-efficiency water reducing agent was adjusted so that the weight of the polycarboxylic acid high-efficiency water reducing agent was 1% based on the total weight of the gel material.
Example 11
A corrosion-resistant concrete was distinguished from example 8 in that 160 parts of water was adjusted to have a water-to-cement ratio of 0.32.
Example 12
A corrosion-resistant concrete was distinguished from example 8 in that the tailing was added in an amount adjusted to give a sand ratio of 0.3.
Example 13
A corrosion resistant concrete, differing from example 8 in that no mineral preservative is included.
Example 14
A corrosion-resistant concrete, differing from example 8 in that Al is present in the mineral corrosion inhibitor2O3The grain size of the superfine powder is 3 mu m.
Example 15
A corrosion-resistant concrete, which is different from example 8 in that the particle size of the silica powder is 0.5. mu.m.
Example 16
An anticorrosion concrete, which is different from the concrete in example 8 in that fly ash, silica powder and Al are contained in the mineral corrosion inhibitor2O3The mass percentages of the powder are respectively 40%, 50% and 10%.
Example 17
A corrosion resistant concrete, differing from example 8 in that the corrosion resistant iron tailing aggregate provided in example 4 was used.
Example 18
A corrosion resistant concrete, differing from example 8 in that the corrosion resistant iron tailing aggregate provided in example 5 was used.
Comparative example 3
A corrosion resistant concrete, differing from example 8 in that the iron tailing aggregate provided in comparative example 1 was used.
Comparative example 4
A corrosion resistant concrete, differing from example 8 in that the iron tailing aggregate provided in comparative example 2 was used.
In the experimental examples, the apparent density, compressive strength, 28d electric flux, slump and expansion of the concrete mixtures provided in examples 6 to 18 and comparative examples 3 to 4 were measured with reference to "standard for testing method of ordinary concrete mixture Performance GB/T50080-2016", "Standard for testing method of mechanical Properties of ordinary concrete GB/T50081-2002" and "Standard for testing method of Long-term Performance and durability of ordinary concrete GB/T50082-2009", and the results are shown in Table 2.
TABLE 2 concrete Performance test results
As can be seen from the data in Table 2, the resulting performance of the electrical flux and sulfate corrosion resistance coefficient of the concretes tested in examples 6-18 is significantly better than that of the concretes provided in comparative examples 3, 4, indicating that the corrosion resistance of the concretes provided in examples 16-18 is significantly better than that of the concretes provided in comparative examples 3, 4.
Examples 9 and 10 differ from example 8 in the ratio of polycarboxylic acid superplasticizer to total weight of the gel material; example 11 differs from example 8 in the water-to-glue ratio; example 12 differs from example 8 in the sand ratio; the water reducing agent dosage, the water-cement ratio and the sand rate in the concrete influence the corrosion resistance, the compressive strength and the workability of the corrosion-resistant concrete.
Example 13 differs from example 8 in that no mineral preservatives are included; examples 14 and 15 differ from example 8 in the particle size of the components in the mineral preservative; example 16 differs from example 8 in the ratio of the three components in the mineral preservative. The fact that whether the mineral preservative is added into the concrete or not and the fly grain size and the mixing proportion of the components in the mineral preservative influence the corrosion resistance, the compressive strength and the workability of the corrosion-resistant concrete.
Example 16 and example 17 differ from example 8 in the corrosion resistant iron tailings aggregate used. The particle size and the proportion of the graded tailing stones in the corrosion-resistant iron tailing aggregate influence the compactness of the aggregate, and further influence the corrosion resistance, the compressive strength and the workability of the corrosion-resistant concrete.
Comparative examples 3 and 4 differ from example 8 in the use of a different corrosion resistant iron tailing aggregate. The effect of taking the tailing stones with discontinuous gradation in the corrosion-resistant iron tailing aggregate as the aggregate and taking the tailing stones without any gradation as the aggregate is far less than that of the concrete prepared by the corrosion-resistant iron tailing aggregate provided by the invention.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (10)
1. A corrosion-resistant iron tailing aggregate is characterized in that: comprises the following components: six grades of tailing stones with the grain sizes of 25-27mm, 18-20mm, 15-17mm, 8-10mm, 4-5mm and 2-3 mm;
the mass percentages of the ore with the matched tails at all levels are respectively 4-6%, 18-22%, 24-26%, 18-22% and 4-6%.
2. A corrosion resistant concrete characterized by: comprising the corrosion resistant iron tailings aggregate of claim 1.
3. The corrosion-resistant concrete according to claim 2, wherein: the paint comprises the following components in parts by weight: 400 portions of cement, 70-100 portions of mineral powder, 750 portions of tailing sand, 150 portions of stone dust, 1100 portions of corrosion-resistant iron tailing aggregate and 180 portions of water.
4. The corrosion-resistant concrete according to claim 3, wherein: also comprises 100-150 parts of mineral preservative, wherein the mineral preservative comprises fly ash, silicon dioxide powder and Al2O3And (3) powder.
5. The corrosion-resistant concrete according to claim 4, wherein: among the mineral preservatives, fly ash, silicon dioxide powder and Al2O3The mass percentages of the powder are respectively 15-20%, 60-65% and 20-25%.
6. The corrosion-resistant concrete according to claim 4, wherein: the fly ash is selected from grade I; the particle size of the silicon dioxide powder is 0.1-0.3 mu m; the Al is2O3The particle size of the powder is 0.5-2 μm.
7. The corrosion-resistant concrete according to claim 4, wherein: the cement mineral powder water reducer also comprises a polycarboxylic acid high-efficiency water reducer, wherein the weight of the polycarboxylic acid high-efficiency water reducer accounts for 1.9-2.2% of the total weight of the cement, the mineral powder and the mineral preservative.
8. The corrosion-resistant concrete according to claim 4, wherein: the water-cement ratio of the corrosion-resistant concrete is 0.35-0.45.
9. The corrosion-resistant concrete according to claim 4, wherein: the sand rate of the corrosion-resistant concrete is 0.39-0.52.
10. A method of preparing corrosion resistant concrete according to any one of claims 2 to 9, comprising the steps of:
s1, screening and selecting the tailing stones according to the grading of 25-27mm, 18-20mm, 15-17mm, 8-10mm, 4-5mm and 2-3mm, and respectively matching the tailing stones according to the mass percentages of 4-6%, 18-22%, 24-26%, 18-22% and 4-6% to prepare the corrosion-resistant iron tailing aggregate;
s2, uniformly mixing 750 parts by weight of tailing sand and 300 parts by weight of stone dust and 150 parts by weight of stone dust; then adding 150-400 parts of cement, 70-100 parts of mineral powder, 150 parts of mineral preservative and 800-1100 parts of the corrosion-resistant iron tailing aggregate prepared in the step S1 in sequence, and uniformly mixing for 50-80 seconds; finally, adding 160-1800 parts of water and the polycarboxylic acid high-efficiency water reducing agent, and uniformly mixing for 100-150 seconds to obtain the corrosion-resistant concrete.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111205038A (en) * | 2020-01-19 | 2020-05-29 | 河北农业大学 | Pumping total iron tailing concrete and preparation method thereof |
| CN111646741A (en) * | 2020-06-28 | 2020-09-11 | 宁波新力建材科技有限公司 | Iron ore special concrete and preparation method thereof |
| CN113816638A (en) * | 2020-06-19 | 2021-12-21 | 中铁西安勘察设计研究院有限责任公司 | Coal gangue concrete corrosion inhibitor and coal gangue concrete with sulfate corrosion resistance |
| CN115745445A (en) * | 2022-12-27 | 2023-03-07 | 河北建设集团正源混凝土有限公司 | Iron tailing aggregate UHPC and preparation method thereof |
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671146A (en) * | 2009-09-24 | 2010-03-17 | 天津港保税区航保商品砼供应有限公司 | Iron tailing concrete |
| CN104743975A (en) * | 2015-03-09 | 2015-07-01 | 中国十七冶集团有限公司 | Iron tailing super-fine sand concrete |
| CN105601206A (en) * | 2016-02-01 | 2016-05-25 | 中国十七冶集团有限公司 | Iron ore waste rock self-compaction concrete |
| CN105693154A (en) * | 2016-02-02 | 2016-06-22 | 金陵科技学院 | Environment-friendly aerated concrete and preparation method thereof |
| CN106116395A (en) * | 2016-06-17 | 2016-11-16 | 合肥工业大学 | A kind of inorganic colloid methoder as road subbase course filler and compound method thereof |
| CN107417211A (en) * | 2017-08-30 | 2017-12-01 | 河北建筑工程学院 | A kind of assembled load bearing heat preserving concrete light steel mixing structural wall board and preparation method thereof |
| CN107473660A (en) * | 2017-08-30 | 2017-12-15 | 河北建筑工程学院 | A kind of building block of high intensity sulfurizing iron tailing concrete and its preparation and application |
| CN107540309A (en) * | 2017-09-15 | 2018-01-05 | 中交武汉港湾工程设计研究院有限公司 | A kind of slope-protecting prefabricated concrete concrete of iron-containing tailing and preparation method thereof |
| CN107540313A (en) * | 2017-10-13 | 2018-01-05 | 武汉理工大学 | A kind of ecological self-compacting concrete |
| CN108529945A (en) * | 2018-06-25 | 2018-09-14 | 中国地质大学（北京） | A kind of iron ore barren rock resource utilization method |
| CN108658546A (en) * | 2018-06-05 | 2018-10-16 | 北京美斯顿科技开发有限公司 | A kind of 3D printing construction material and its application |
| CN109081652A (en) * | 2018-08-31 | 2018-12-25 | 华北理工大学 | It is pressed and molded rubber iron tailings sand cement plate and preparation method |
| CN109250988A (en) * | 2018-11-13 | 2019-01-22 | 中安瑞宝建设集团有限公司 | A kind of ecotype Cement-base material with ultra-high performance and preparation method thereof |
| CN109928685A (en) * | 2019-04-11 | 2019-06-25 | 北京建筑材料科学研究总院有限公司 | Utilize the high-early strength concrete and its preparation method of the preparation of a variety of industrial solid castoffs |
| CN110128075A (en) * | 2019-06-03 | 2019-08-16 | 青岛中建富兴商砼有限公司 | A kind of C30 tailing sand concrete and preparation method thereof |
-
2019
- 2019-09-25 CN CN201910914086.1A patent/CN110698098A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671146A (en) * | 2009-09-24 | 2010-03-17 | 天津港保税区航保商品砼供应有限公司 | Iron tailing concrete |
| CN104743975A (en) * | 2015-03-09 | 2015-07-01 | 中国十七冶集团有限公司 | Iron tailing super-fine sand concrete |
| CN105601206A (en) * | 2016-02-01 | 2016-05-25 | 中国十七冶集团有限公司 | Iron ore waste rock self-compaction concrete |
| CN105693154A (en) * | 2016-02-02 | 2016-06-22 | 金陵科技学院 | Environment-friendly aerated concrete and preparation method thereof |
| CN106116395A (en) * | 2016-06-17 | 2016-11-16 | 合肥工业大学 | A kind of inorganic colloid methoder as road subbase course filler and compound method thereof |
| CN107473660A (en) * | 2017-08-30 | 2017-12-15 | 河北建筑工程学院 | A kind of building block of high intensity sulfurizing iron tailing concrete and its preparation and application |
| CN107417211A (en) * | 2017-08-30 | 2017-12-01 | 河北建筑工程学院 | A kind of assembled load bearing heat preserving concrete light steel mixing structural wall board and preparation method thereof |
| CN107540309A (en) * | 2017-09-15 | 2018-01-05 | 中交武汉港湾工程设计研究院有限公司 | A kind of slope-protecting prefabricated concrete concrete of iron-containing tailing and preparation method thereof |
| CN107540313A (en) * | 2017-10-13 | 2018-01-05 | 武汉理工大学 | A kind of ecological self-compacting concrete |
| CN108658546A (en) * | 2018-06-05 | 2018-10-16 | 北京美斯顿科技开发有限公司 | A kind of 3D printing construction material and its application |
| CN108529945A (en) * | 2018-06-25 | 2018-09-14 | 中国地质大学（北京） | A kind of iron ore barren rock resource utilization method |
| CN109081652A (en) * | 2018-08-31 | 2018-12-25 | 华北理工大学 | It is pressed and molded rubber iron tailings sand cement plate and preparation method |
| CN109250988A (en) * | 2018-11-13 | 2019-01-22 | 中安瑞宝建设集团有限公司 | A kind of ecotype Cement-base material with ultra-high performance and preparation method thereof |
| CN109928685A (en) * | 2019-04-11 | 2019-06-25 | 北京建筑材料科学研究总院有限公司 | Utilize the high-early strength concrete and its preparation method of the preparation of a variety of industrial solid castoffs |
| CN110128075A (en) * | 2019-06-03 | 2019-08-16 | 青岛中建富兴商砼有限公司 | A kind of C30 tailing sand concrete and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 郝晋高等: "铁尾矿砂石对C50混凝土性能的影响", 《山西交通科技》 * |
| 陈杏婕等: "全尾矿废石骨料高强混凝土的试验研究", 《金属矿山》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111205038A (en) * | 2020-01-19 | 2020-05-29 | 河北农业大学 | Pumping total iron tailing concrete and preparation method thereof |
| CN113816638A (en) * | 2020-06-19 | 2021-12-21 | 中铁西安勘察设计研究院有限责任公司 | Coal gangue concrete corrosion inhibitor and coal gangue concrete with sulfate corrosion resistance |
| CN111646741A (en) * | 2020-06-28 | 2020-09-11 | 宁波新力建材科技有限公司 | Iron ore special concrete and preparation method thereof |
| CN111646741B (en) * | 2020-06-28 | 2022-03-25 | 宁波新力建材科技有限公司 | Iron ore special concrete and preparation method thereof |
| CN115745445A (en) * | 2022-12-27 | 2023-03-07 | 河北建设集团正源混凝土有限公司 | Iron tailing aggregate UHPC and preparation method thereof |
| CN115974449A (en) * | 2022-12-29 | 2023-04-18 | 中铁上海工程局集团有限公司 | Regulator for sand-stone concrete made by iron tailing machine and preparation method and use method thereof |
| CN115974449B (en) * | 2022-12-29 | 2024-02-23 | 中铁上海工程局集团有限公司 | Regulator for sandstone concrete by iron tailing machine and preparation method and using method thereof |
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