CN112794682A - Premixed fluid solidified soil doped with high-silicon type iron tailings and preparation method thereof - Google Patents
Premixed fluid solidified soil doped with high-silicon type iron 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
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
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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
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities 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
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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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 field of civil engineering materials, and particularly relates to premixed flow-state solidified soil doped with high-silicon type iron tailings and a preparation method thereof. The premixed fluid solidified soil doped with the high-silicon type iron tailings is prepared from the following raw materials in parts by mass: 1-2 parts of lime, 2-5 parts of iron tailing powder, 12-15 parts of graded soil, 2-3 parts of water and 0.02-0.05 part of grinding aid. The invention provides premixed fluid state solidified soil, which makes full use of foundation pit excavation spoil, and after a certain proportion of curing agent and water are mixed, the premixed fluid state solidified soil is fully mixed through a special machine to form a pumpable and flowable reinforcing material which is used for backfill and pouring of various foundation pits and mine pits, can be widely used in the field of reinforcement treatment such as road foundations, building foundations and the like, effectively reduces the use of high energy consumption resources such as cement lime and the like, and reduces energy consumption and carbon dioxide emission; and meanwhile, a large amount of industrial solid wastes are applied, and the storage of solid waste garbage is reduced.
Description
Technical Field
The invention belongs to the field of civil engineering materials, and particularly relates to premixed flow-state solidified soil doped with high-silicon type iron tailings and a preparation method thereof.
Background
In the backfill construction process of the engineering foundation trench, the difficult problems of narrow backfill space of the foundation trench, large backfill depth, unstable tamping quality of backfill soil, high quality required by the backfill soil and the like are often encountered. Particularly, in recent years, deep foundation pit supporting works are increasing. The accidents of water dispersion, pipeline, house-entering roads and the like of buildings are subsided and damaged due to the fact that the backfilled soil is not compact, and the use function is lost occur. In addition, the backfill of the foundation trench is limited by factors such as backfill conditions, space and the like, and cannot be densely backfilled, so that the damage to the seismic performance of the high-rise building is easily brought. In the traditional process, plain soil or lime-soil layered materials are mostly adopted, and small-sized tamping equipment is used for construction. But the construction difficulty is higher, the backfilling period is longer, and the backfilling quality is difficult to control. Or in order to ensure the backfilling quality, plain concrete is used for backfilling. However, the use of plain concrete for backfill has high cost and high strength, which brings difficulties for later maintenance and repair. Therefore, the premixed fluid solidified soil with fluidity and certain strength can be widely applied to engineering. At present, the curing agent in the fluidized curing soil is mostly prepared from cement, fly ash and a small amount of additive according to a proportion to prepare slurry, and then the slurry is mixed with soil to form a cured soil mixture.
The accumulated stockpiling quantity of the tailings in China is huge, and the comprehensive utilization is low; the production of iron tailings is about 4.76 hundred million tons, which accounts for 39.31% of the total production of the tailings. In order to improve the comprehensive utilization of the iron tailings, the alkali-activated preparation of the soil stabilizer from the iron tailings is one of effective ways for improving the resource utilization of the iron tailings.
Disclosure of Invention
Aiming at the problem that in the prior art, the construction of deep foundation pit support is limited by factors such as backfill conditions, space and the like and cannot be backfilled densely, the invention aims to provide premixed fluidized solidified soil doped with high-silicon type iron tailings and a preparation method thereof. The invention provides premixed fluid state solidified soil, which makes full use of foundation pit excavation spoil, and after a certain proportion of curing agent and water are mixed, the premixed fluid state solidified soil is fully mixed through a special machine to form a pumpable and flowable reinforcing material which is used for backfill and pouring of various foundation pits and mine pits, can be widely used in the field of reinforcement treatment such as road foundations, building foundations and the like, effectively reduces the use of high energy consumption resources such as cement lime and the like, and reduces energy consumption and carbon dioxide emission; and meanwhile, a large amount of industrial solid wastes are applied, and the storage of solid waste garbage is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme.
The premixed fluid solidified soil doped with the high-silicon type iron tailings is prepared from the following raw materials in parts by mass: 1-2 parts of lime, 2-5 parts of iron tailing powder, 12-15 parts of graded soil, 2-3 parts of water and 0.02-0.05 part of grinding aid.
Furthermore, the effective CaO content in the lime is more than or equal to 65 percent, MgO is 5 to 10 percent, undigested residue is less than or equal to 17 percent, and the grain size is less than or equal to 0.075 mm.
Further, the iron tailing powder is high-silicon iron tailing and comprises the following chemical components in percentage by mass: SiO 22 60％～75％、MgO 6％～0％、CaO 5％～8％、Al2O3 4％～7％、Fe2O38 to 12 percent, the fineness of the powder meets the requirement that 90 percent of the powder passes through a sieve pore of 0.3mm, 70 percent of the powder passes through a sieve pore of 0.075mm, and the specific surface area is more than 2500cm2/g。
Furthermore, the graded soil is gravel, crushed rock, coal gangue and various granular slag, the maximum grain size of the graded soil is not more than 37.5mm, and the water content of the graded soil is less than or equal to 20%; 0-7% of the particle size of 0-0.075mm, 3-11% of the particle size of 0.075mm-0.6mm, 7-15% of the particle size of 0.6mm-2.36mm, 20-28% of the particle size of 2.36mm-4.75mm, 20-36% of the particle size of 4.75mm-9.5mm, 10-22% of the particle size of 9.5mm-19mm, 10-18% of the particle size of 19mm-31.5mm, and 0-5% of the particle size of 31.5mm-37.5 mm.
Furthermore, the grinding aid is sodium polyphosphate, lignosulfonate, graphite powder, anhydrous sodium carbonate, calcium sulfate dihydrate, ammonium chloride and the like, and the particle size of the grinding aid is less than or equal to 0.075 mm.
Further, the preparation method of the premixed fluid solidified soil doped with the high-silicon type iron tailings specifically comprises the following steps.
Step 1, taking 2-5 parts of iron tailings, mechanically grinding for 1-2 hours, adding 0.02-0.05 part of grinding aid, and continuously grinding for 1-2 hours.
And 2, preparing materials according to the raw material proportion, namely 1-2 parts of lime and 2-5 parts of high-silicon type iron tailings, calculating the mass of the water through a water-to-gel ratio, mixing and stirring the lime and the high-silicon type iron tailings uniformly, and then slowly adding water and stirring uniformly to obtain the curing agent.
And 3, calculating the quality of the graded soil according to the proportion of the curing agent to the soil.
And 4, mixing and stirring the curing agent and the graded soil uniformly to form the cured soil.
Further, the mass ratio of the water to the mixture of lime and iron tailing powder in the step 2 is 1.5-6.0: 1.
further, the water in the step 2 is drinking water or clean neutral water without impurities such as oil and the like, and the pH value is 6-8.
Further, the ratio of the curing agent to the soil in the step 3 is 3: 7-1: 9.
furthermore, a stirring station is set for centralized stirring, and then the concrete tank truck is used for transporting the mixture to cast-in-place; or the curing agent slurry is intensively mixed and then transported to a curing soil stirring station set on site to be stirred with soil to form the curing soil.
Compared with the prior art, the invention has the following beneficial effects.
In the prior art, cement is used as a solidified soil solidifying agent, 0.7 ton of limestone is consumed for producing 1 ton of cement, 0.6 ton of toxic gas is generated, and the cement solidified soil solidifying agent belongs to a product with high energy, high consumption and high pollution. In the premixed fluid solidified soil doped with the high-silicon type iron tailings, silicon dioxide and aluminum oxide are mainly provided by industrial waste materials, raw materials are not required to be obtained by mountain-opening stone-blasting, and the raw materials are not required to be fired, so that the production process is completely green, and is smokeless, dustless and wastewater-free.
In the backfilling process of various foundation trenches, plain soil or lime soil layered materials are used in the traditional process, so that the problems of high construction difficulty, long backfilling period, difficulty in controlling backfilling quality and the like are prominent. The preparation method of the premixed fluid-state solidified soil doped with the high-silicon type iron tailings, provided by the invention, uses the fluid-state solidified soil for pumping construction, and has the advantages of high construction speed, short solidification time, high early strength, reliable construction quality and the like.
In the backfill of the high-rise building foundation pit, compared with the plain concrete prepared by the traditional process, the premixed fluid-state solidified soil doped with the high-silicon type iron tailings can provide the strength meeting the engineering requirements, and is more reasonable economically; in later-stage pipeline maintenance excavation construction, the method has the advantages of convenience in excavation, simplicity and rapidness in construction and the like.
The main raw materials of the ready-mixed fluid solidified soil doped with the high-silicon type iron tailings can adopt engineering excavation soil, and a series of physical and chemical reactions are carried out between cementing materials of calcium silicate hydrate, calcium aluminate hydrate and calcium ferroaluminate hydrate generated in the alkali excitation process as curing agents and soil, so that the solidified soil is easy to compact into a whole, and good macroscopic mechanical properties are obtained.
The premixed fluid solidified soil doped with the high-silicon type iron tailings provided by the invention can meet the strength requirement in engineering application, can reduce the use of products with high energy, high consumption, high pollution and the like, and can reduce environmental pollution. The grinded iron tailings have volcanic ash activity, and a certain amount of active ingredients such as active silicon dioxide and active aluminum oxide exist. The reaction mechanism is as follows: first, calcium oxide in lime reacts with water to produce calcium hydroxide. Then the calcium hydroxide reacts with the active component to generate products such as hydrated calcium silicate, hydrated calcium aluminate, hydrated calcium aluminoferrite and the like. The main reaction equation is as follows:
CaO+H2O＝Ca(OH)2
calcium hydroxide generated in the reaction is used as a raw material for the next reaction, and an alkaline environment is provided for the next reaction.
2Ca(OH)2+SiO2+nH2O→2CaO·SiO2·H2O
3Ca(OH)2+SiO2+nH2O→3CaO·SiO2·nH2O
3Ca(OH)2+Al2O3+nH2O→3CaO·Al2O3·nH2O
4Ca(OH)2+Al2O3+Fe2O3+nH2O→4CaO·Al2O3·Fe2O3·nH2O。
The above reaction produces calcium silicate hydrate, calcium aluminate hydrate, calcium ferroaluminate hydrate and other gel materials as curing agent. The physical and chemical reaction between the soil stabilizer and the soil particles can improve the contact surface between the soil particles and strengthen the connection structure between the soil particles. The process is summarized as that the curing agent and soil components are subjected to ion adsorption and exchange, so that the electric quantity of the surface of the soil micelle is reduced, the thickness of double electric layers of the soil micelle is reduced, and soil particles tend to agglomerate. The chemical reaction produces new matter to strengthen the connection between soil grains and produce volume expansion to improve and fill the pores between soil grains. The distance between soil particles is shortened under the action of external extrusion force, the soil structure is compacted, and the solidified soil is easily compacted into a whole, so that good macroscopic mechanical properties are obtained.
Drawings
FIG. 1 is a construction flow chart of premixed fluid solidified soil doped with high-silicon type iron tailings.
Detailed Description
The premixed fluid solidified soil doped with the high-silicon type iron tailings is prepared from the following raw materials in parts by mass: 1-2 parts of lime, 2-5 parts of iron tailing powder, 12-15 parts of graded soil, 2-3 parts of water and 0.02-0.05 part of grinding aid.
Furthermore, the effective CaO content in the lime is more than or equal to 65 percent, MgO is 5 to 10 percent, undigested residue is less than or equal to 17 percent, and the grain size is less than or equal to 0.075 mm.
Further, the iron tailing powder is high-silicon iron tailing and comprises the following chemical components in percentage by mass: SiO 22 60％～75％、MgO 6％～0％、CaO 5％～8％、Al2O3 4％～7％、Fe2O38 to 12 percent, the fineness of the powder meets the requirement that 90 percent of the powder passes through a sieve pore of 0.3mm, 70 percent of the powder passes through a sieve pore of 0.075mm, and the specific surface area is more than 2500cm2/g。
Furthermore, the maximum grain size of the graded soil is not more than 37.5mm, and the water content of the graded soil is less than or equal to 20 percent; 0-7% of the particle size of 0-0.075mm, 3-11% of the particle size of 0.075mm-0.6mm, 7-15% of the particle size of 0.6mm-2.36mm, 20-28% of the particle size of 2.36mm-4.75mm, 20-36% of the particle size of 4.75mm-9.5mm, 10-22% of the particle size of 9.5mm-19mm, 10-18% of the particle size of 19mm-31.5mm, and 0-5% of the particle size of 31.5mm-37.5 mm.
Furthermore, the grinding aid is sodium polyphosphate, lignosulfonate graphite powder, anhydrous sodium carbonate, calcium sulfate dihydrate, ammonium chloride and the like, and the particle size of the grinding aid is less than or equal to 0.075 mm.
The preparation method of the premixed fluid solidified soil doped with the high-silicon type iron tailings comprises the following specific steps.
Step one, mechanically grinding the high-silicon type iron tailings for 1-2 hours. Grinding aid with the fineness not more than 1% can be added in the grinding process, so that the fineness of the high-silicon tailings meets the condition that 90% of the high-silicon tailings pass through a sieve pore with the diameter of 0.3mm and 70% of the high-silicon tailings pass through a sieve pore with the diameter of 0.075mm, and the specific surface area is preferably more than 2500cm2/g。
Determining the proportion of lime to iron tailings according to different calcium and magnesium contents, wherein the suitable mass ratio is 1: 2-1: 5. when the effective CaO content is 50-70%, taking 1: 3; when the content of the effective CaO is more than 70%, taking 1: 4. and (3) compacting and forming the test piece according to the specification, and reasonably selecting the proportion of the lime and the iron tailing powder according to the strength of the test piece after standard curing and the combination of the use requirement and the economic requirement.
And step three, mixing and stirring the iron tailings obtained in the step one with lime uniformly to form a mixture of the lime and the iron tailing powder.
And step four, selecting graded soil, wherein the maximum particle size of the crushed stone is not larger than 37.5 mm. The main materials suitable for the solidified soil are; gravel, crushed rock, coal gangue, various granular slag and the like. The main material of the solidified soil has good grading, and the crushing resistance value of the crushed stones or gravels in the main material of the solidified soil meets the requirement of the crushing resistance value of the aggregate.
Step five, determining the proportion of the curing agent to the soil according to the specific requirements of structural strength, shrinkage coefficient, water stability, crack resistance, durability and the like, and ensuring that the curing agent: the mass ratio of the soil is 3: 7-1: 9.
and step six, adding water into the mixture of the lime and the iron tailing powder obtained in the step three, and uniformly stirring to form curing agent slurry. And the mixture of lime and iron tailing powder is 1.5-6.0: 1. the water is in accordance with the regulations of the national current standard of concrete water standard JGJ 63. The pH value of the drinking water and the clean neutral water without impurities such as oil is 6-8.
And step seven, adding the curing agent slurry obtained in the step six into the graded soil, and continuously stirring uniformly. Forming novel premixed fluidized solidified soil.
Examples 1-7 the blending ratio of the ready-mixed fluid-state solidified soil doped with the high-silicon type iron tailings is shown in table 1.
Example 1.
And 3 parts of high-silicon iron tailings are ground for 1 hour by using a ball mill, 0.005 part of grinding aid sodium polyphosphate is added, and the grinding is continued for 1 hour to obtain iron tailing powder. And mixing and stirring the ground iron tailing powder and 1 part of lime uniformly, adding 2 parts of water and stirring until uniform curing agent slurry is formed. Adding 12 parts of graded soil meeting the requirements, mixing and stirring to form uniform ready-mixed fluid state solidified soil.
Example 2.
And 3 parts of high-silicon iron tailings are ground for 1 hour by using a ball mill, 0.005 part of grinding aid sodium polyphosphate is added, and the grinding is continued for 1 hour to obtain iron tailing powder. And mixing and stirring the ground iron tailing powder and 1 part of lime uniformly, adding 2.5 parts of water and stirring until uniform curing agent slurry is formed. Adding 12 parts of graded soil meeting the requirements, mixing and stirring to form uniform ready-mixed fluid state solidified soil.
Example 3.
And 3 parts of high-silicon iron tailings are ground for 1 hour by using a ball mill, 0.005 part of grinding aid sodium polyphosphate is added, and the grinding is continued for 1 hour to obtain iron tailing powder. And mixing and stirring the ground iron tailing powder and 1 part of lime uniformly, adding 3 parts of water and stirring until uniform curing agent slurry is formed. Adding 12 parts of graded soil meeting the requirements, mixing and stirring to form uniform ready-mixed fluid state solidified soil.
Example 4.
And 3 parts of high-silicon iron tailings are ground for 1 hour by using a ball mill, 0.005 part of grinding aid sodium polyphosphate is added, and the grinding is continued for 1 hour to obtain iron tailing powder. And mixing and stirring the ground iron tailing powder and 1 part of lime uniformly, adding 2 parts of water and stirring until uniform curing agent slurry is formed. Adding 14 parts of graded soil meeting the requirements, mixing and stirring until uniform premixed fluid state solidified soil is formed.
Example 5.
And 3 parts of high-silicon iron tailings are ground for 1 hour by using a ball mill, 0.005 part of grinding aid sodium polyphosphate is added, and the grinding is continued for 1 hour to obtain iron tailing powder. And mixing and stirring the ground iron tailing powder and 1 part of lime uniformly, adding 2 parts of water and stirring until uniform curing agent slurry is formed. Adding 15 parts of graded soil meeting the requirements, mixing and stirring until uniform premixed fluid state solidified soil is formed.
Example 6.
And 3 parts of high-silicon iron tailings are ground for 1 hour by using a ball mill, 0.005 part of grinding aid sodium polyphosphate is added, and the grinding is continued for 1 hour to obtain iron tailing powder. And mixing and stirring the ground iron tailing powder and 1.5 parts of lime uniformly, adding 2.25 parts of water and stirring until uniform curing agent slurry is formed. Adding 13 parts of graded soil meeting the requirements, mixing and stirring to form uniform premixed fluid state solidified soil.
Example 7.
And 3 parts of high-silicon iron tailings are ground for 1 hour by using a ball mill, 0.005 part of grinding aid sodium polyphosphate is added, and the grinding is continued for 1 hour to obtain iron tailing powder. And mixing and stirring the ground iron tailing powder and 2.5 parts of lime uniformly, adding 2 parts of water and stirring until uniform curing agent slurry is formed. Adding 15 parts of graded soil meeting the requirements, mixing and stirring until uniform premixed fluid state solidified soil is formed.
Table 1. examples 1-7 blend proportions of ready-mixed fluid solidified soil doped with high-silicon type iron tailings.
| Examples | High-silicon type iron tailings | Lime | Water (W) | Graded soil |
| 1 | 3 | 1 | 2 | 12 |
| 2 | 3 | 1 | 2.5 | 12 |
| 3 | 3 | 1 | 3 | 12 |
| 4 | 3 | 1 | 2 | 14 |
| 5 | 3 | 1 | 2 | 15 |
| 6 | 3 | 1.5 | 2.25 | 13 |
| 7 | 3 | 2 | 2.5 | 15 |
Examples 1-7 the ready-mixed fluid-state solidified soil doped with high-silicon type iron tailings prepared by the above preparation method satisfies the actual engineering requirements in terms of various performance indexes.
Claims (10)
1. The premixed fluid solidified soil doped with the high-silicon type iron tailings is characterized by comprising the following raw materials in parts by mass: 1-2 parts of lime, 2-5 parts of iron tailing powder, 12-15 parts of graded soil, 2-3 parts of water and 0.02-0.05 part of grinding aid.
2. The ready-mixed fluidized solidified soil doped with high-silicon type iron tailings of claim 1, wherein the lime contains more than or equal to 65% of available CaO, 5-10% of MgO, less than or equal to 17% of undigested residue and less than or equal to 0.075mm of particle size.
3. The ready-mixed fluidized solidified soil doped with high-silicon type iron tailings of claim 1, wherein the iron tailings powder is high-silicon type iron tailings and comprises the following chemical components in percentage by mass: SiO 22 60%～75%、MgO 6%～0%、CaO 5%～8%、Al2O3 4%～7%、Fe2O38 to 12 percent, the fineness of the powder meets the requirement that 90 percent of the powder passes through a sieve pore of 0.3mm, 70 percent of the powder passes through a sieve pore of 0.075mm, and the specific surface area is more than 2500cm2/g。
4. The premixed fluidized solidified soil doped with high-silicon type iron tailings of claim 1, wherein the graded soil is gravel, crushed rock, coal gangue and various granular slag, the maximum grain size of the graded soil is not more than 37.5mm, and the water content of the graded soil is less than or equal to 20%; 0-7% of the particle size of 0-0.075mm, 3-11% of the particle size of 0.075mm-0.6mm, 7-15% of the particle size of 0.6mm-2.36mm, 20-28% of the particle size of 2.36mm-4.75mm, 20-36% of the particle size of 4.75mm-9.5mm, 10-22% of the particle size of 9.5mm-19mm, 10-18% of the particle size of 19mm-31.5mm, and 0-5% of the particle size of 31.5mm-37.5 mm.
5. The ready-mixed fluidized solidified soil doped with high-silicon type iron tailings of claim 1, wherein the grinding aid is sodium polyphosphate, lignosulfonate, graphite powder, anhydrous sodium carbonate, calcium sulfate dihydrate and ammonium chloride, and the particle size of the grinding aid is less than or equal to 0.075 mm.
6. The preparation method of the ready-mixed fluidized solidified soil doped with the high-silicon type iron tailings in the claim 1 is characterized by comprising the following steps:
step 1, taking 2-5 parts of iron tailings, mechanically grinding for 1-2 hours, adding 0.02-0.05 part of grinding aid, and continuously grinding for 1-2 hours;
step 2, preparing materials according to a raw material proportion, calculating the mass of water through a water-to-gel ratio by using 1-2 parts of lime and 2-5 parts of high-silicon type iron tailings, mixing and stirring the lime and the high-silicon type iron tailings uniformly, and then slowly adding water and stirring uniformly to obtain a curing agent;
step 3, calculating the quality of the graded soil according to the proportion of the curing agent to the soil;
and 4, mixing and stirring the curing agent and the graded soil uniformly to form the cured soil.
7. The method for preparing the ready-mixed fluidized solidified soil doped with the high-silicon type iron tailings in the claim 1, wherein the mass ratio of the water to the mixture of the lime and the iron tailings powder in the step 2 is 1.5-6.0: 1.
8. the method for preparing the ready-mixed fluidized solidified soil doped with the high-silicon type iron tailings in the claim 6, wherein the water in the step 2 is drinking water or clean neutral water without oil impurities, and the pH value is 6-8.
9. The preparation method of the ready-mixed fluid solidified soil doped with the high-silicon type iron tailings in claim 6, wherein the ratio of the firming agent to the soil in the step 3 is 3: 7-1: 9.
10. the preparation method of the ready-mixed fluidized solidified soil doped with the high-silicon type iron tailings in the claim 6 is characterized in that a stirring station is set up for centralized stirring, and the ready-mixed fluidized solidified soil is transported to a site for pouring by a concrete tanker; or the curing agent slurry is intensively mixed and then transported to a curing soil stirring station set on site to be stirred with soil to form the curing soil.
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Cited By (2)
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| CN116143468A (en) * | 2022-12-29 | 2023-05-23 | 沈阳工业大学 | Premixed fluid state solidified salty soil and preparation method thereof |
| CN116177971A (en) * | 2023-01-04 | 2023-05-30 | 中国十九冶集团有限公司 | Preparation method of fluidized solidified soil and foundation trench backfilling construction method |
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2021
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| CN116143468A (en) * | 2022-12-29 | 2023-05-23 | 沈阳工业大学 | Premixed fluid state solidified salty soil and preparation method thereof |
| CN116143468B (en) * | 2022-12-29 | 2024-05-17 | 沈阳工业大学 | Premixed fluid state solidified salty soil and preparation method thereof |
| CN116177971A (en) * | 2023-01-04 | 2023-05-30 | 中国十九冶集团有限公司 | Preparation method of fluidized solidified soil and foundation trench backfilling construction method |
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