CN117510169A - An early-strength and water-resistant fluidized soil based on undisturbed shield muck and its preparation method - Google Patents
An early-strength and water-resistant fluidized soil based on undisturbed shield muck and its preparation method 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
- C04B28/14—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 calcium sulfate 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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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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
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to early-strength water-resistant type fluidized soil based on undisturbed shield slag soil and a preparation method thereof, wherein the fluidized soil comprises the following raw materials in percentage by mass: 78% -99% of undisturbed shield residue soil slurry, 0.2% -10.5% of alkali-activated cementing material, 0.2% -5.9% of cement, 0.03% -1.5% of stone powder, 0.02% -2.0% of gypsum and 0.55% -2.1% of reinforcing agent; according to the invention, the original shield slag soil is prepared into high-fluidity slurry, and the slurry is mixed with alkali-activated cementing material, cement, stone powder, gypsum and reinforcing agent in a specific proportion to prepare the fluidized soil for backfilling, so that no waste water, waste residue or mud cake is generated in the whole process, the purpose of full-resource utilization is achieved, and the added value is greatly improved while the shield slag soil can be consumed in a large scale. The undisturbed shield slag soil fluidization soil has the advantages of high early strength, large water stability coefficient, small volume water absorption, good impermeability and wide application.
Description
Technical Field
The invention belongs to the technical field of building materials and solid waste treatment, and particularly relates to early-strength water-resistant fluidized soil based on undisturbed shield slag soil and a preparation method thereof.
Background
At present, urban rail transit construction in China has large scale and high speed, and a large amount of shield slag soil is generated. In the shield tunneling process, in order to avoid the phenomena of cutter head abrasion and mud cake formation, smooth tunneling and slag tapping are ensured, foam agents, high-molecular polymers and the like are required to be added to improve the fluidity of the slag soil, so that the shield slag soil has higher solidification difficulty compared with other engineering slag soil. Meanwhile, a large amount of waste mud is generated during the construction of the cast-in-place piles and the underground diaphragm walls of the subway station and the auxiliary structures. Therefore, how to dispose a huge amount of shield slag and waste mud is an unavoidable problem for subway construction. Meanwhile, a large number of foundation trenches, holes or other narrow spaces such as pipe galleries, buildings, rail traffic engineering and the like, road roadbeds, the bench backs of traffic engineering and the like are required to be backfilled, and the traditional backfilling technology has the defects of difficult operation, incomplete filling in place, difficult compaction, high engineering cost and the like of machines and tools in the narrow spaces.
The main components of the shield slag soil are gravels, sand, silt, clay and water, the shield slag soil is in a paste shape, if the original shield slag soil is prepared into fluidized solidified soil which has higher fluidity and can be constructed by adopting a pumping or pouring mode in cooperation with industrial solid waste, the shield slag soil is treated and utilized on a large scale, meanwhile, the production cost is reduced, the additional value of the shield slag soil is improved, the risk brought by the disposal of the slag soil is avoided, and obvious economic benefit, environmental benefit and social benefit are obtained.
Because the shield residue soil contains a large amount of powder soil, clay and water, how to improve early strength, water resistance, impermeability and the like of the fluidized soil after solidification while ensuring high fluidity is a key for preparing the fluidized soil by the undisturbed shield residue soil. In addition, in the shield tunneling process, in order to avoid the phenomena of cutter head abrasion and mud cake formation, smooth tunneling and slag tapping are ensured, and foam agents, high-molecular polymers and the like are required to be added to improve the slag soil, so that the shield slag soil has good fluidity, is not beneficial to solidification and molding, and brings challenges to preparing early-strength water-resistant type fluidized soil from high-water-content shield slag soil slurry.
Disclosure of Invention
Aiming at the problems that the moisture content of the original shield slag soil is high, the viscosity is high, the dehydration and screening are difficult, and the early solidification strength is low due to the inclusion of a foaming agent, etc., the invention provides the early strength water-resistant type fluidized soil based on the original shield slag soil.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the early strength water-resistant type fluidized soil based on undisturbed shield slag soil comprises the following raw materials in percentage by mass: 78 to 99 percent of undisturbed shield slag soil slurry, 0.2 to 10.5 percent of alkali-activated cementing material, 0.2 to 5.9 percent of cement, 0.03 to 1.5 percent of stone powder, 0.02 to 2.0 percent of gypsum and 0.55 to 2.1 percent of reinforcing agent.
Preferably, the undisturbed shield residue soil is undisturbed residue soil which is not dehydrated and screened in a ground residue soil pool and is transported or pumped into a soil bin through a screw conveyor, a belt conveyor and a track residue soil truck after a cutter head of the shield machine cuts a front soil body.
Preferably, the undisturbed muck is one or more of earth pressure balance shield muck or slurry balance shield muck.
More preferably, the undisturbed slag is waste mud generated in the construction of the cast-in-place piles, underground diaphragm walls and the like of subway stations and auxiliary structures.
Preferably, the moisture content of the undisturbed shield slag mud is greater than 60%.
Preferably, the alkali-activated cementing material comprises the following raw materials in percentage by mass: 60-90% of a gelling component and 10-40% of an alkali-activator.
Preferably, the gelling component is one or more of blast furnace slag, fly ash, silica fume, steel slag, natural volcanic ash and phosphorous slag.
Further, the fineness of the gel component is 200 mesh or more.
Preferably, the alkali-activator is one or more of quicklime, sodium carbonate, sodium silicate and sodium hydroxide.
Preferably, the calcium content of the quicklime is more than 75%, and the fineness is more than 100 meshes.
Preferably, the sodium carbonate is in a powder form, and the fineness is more than 100 meshes.
Preferably, the sodium silicate is in a powder form, the modulus is 2.0-3.2, and the fineness is more than 100 meshes.
Preferably, the sodium hydroxide is in solid flake analytical purity, greater than 99%.
Preferably, the stone powder is one or more of natural stone powder and construction waste regenerated micro powder, and the fineness is more than 200 meshes.
Preferably, the gypsum is one or more of natural gypsum, desulfurized gypsum and phosphogypsum, and the fineness is more than 200 meshes.
Preferably, the reinforcing agent is one or more of sodium metaaluminate, sodium sulfate, aluminum sulfate, polyaluminum chloride and calcium chloride, and is solid particles or powder.
Preferably, the cement is Portland cement.
The invention also provides a preparation method of the early-strength water-resistant type fluidized soil based on the undisturbed shield slag soil, which comprises the following steps: mixing the undisturbed shield slag soil with water to prepare undisturbed shield slag soil slurry with the water content of more than 60%, and uniformly mixing the undisturbed shield slag soil slurry with alkali-activated cementing materials, cement, gypsum, stone powder and reinforcing agents.
Preferably, the fluidized soil can be backfilled by pumping or pouring.
Preferably, the early-strength water-resistant fluidized soil based on undisturbed shield slag soil can be applied to backfilling of foundation trenches, holes or other narrow spaces, such as pipe galleries, buildings, rail traffic engineering and the like.
Compared with the prior art, the invention has the following beneficial effects:
the early strength water-resistant fluidized soil provided by the invention is prepared by further preparing the original shield slag soil into high-fluidity slurry and mixing the slurry with alkali-activated cementing materials, cement, gypsum, stone powder and reinforcing agents in a specific ratio, aiming at the problems that the original shield slag soil is high in water content, high in viscosity, difficult to dehydrate and sieve, poor in curing effect and low in early strength caused by an additional foaming agent, a high-molecular polymer and the like. The original shield slag soil is prepared into slurry with high fluidity, so that the viscosity of the shield slag soil is reduced, the shield slag soil is fully contacted with and mixed with the curing materials comprising alkali-activated cementing materials, cement, gypsum, stone powder and reinforcing agents, and the curing effect is improved. Compared with the method that the undisturbed shield residue soil is directly mixed and stirred with the curing material, the requirement on the performance of stirring equipment is weakened, and the shield residue soil with higher mud content can be treated in a large-scale manner by adopting conventional stirring equipment, and then backfilling construction can be carried out by adopting a pumping or pouring mode.
Because the water content of the prepared shield slag soil slurry is extremely high, cement cannot form enough hydration products to achieve the curing effect, alkali-activated cementing materials are dissolved in the original shield slag soil slurry through alkali excitant to form a strong alkali environment, and the silica bond and the alumina bond in the cementing component vitreous body are excited to dissolve out [ SiO 4 ]、[AlO 4 ]Tetrahedron is diffused to the periphery and is adsorbed on the surface of the shield slag mud particles to generate a cementing material; in the shield residue mud with high water content, the alkali concentration is reduced, and enough gelling substances cannot be generated to solidify the residue in the alkaline environment, so that the macroscopic appearance is low in solidification strength, particularly early strength. Therefore, the invention adopts one or more of sodium metaaluminate, sodium sulfate, aluminum sulfate, polyaluminum chloride and calcium chloride as reinforcing agent to increaseThe strong agent is dissolved in water to release AlO 2 - 、SO 4 2- 、Al 3+ 、Ca 2+ And the like, hydroxide ions are further hydrated and released, so that the alkali concentration in a shield slag soil slurry system is increased, the alkali excitation reaction is enhanced, and active clay minerals in the original shield slag soil also participate in the reaction under the high cement-bearing slurry state, thereby achieving the effects of adsorbing, agglomerating and solidifying slag soil particles and improving the solidification strength.
The fluidized soil based on the undisturbed shield residue soil provided by the invention has the advantages of high early strength, large water stability coefficient, small volume water absorption, good impermeability, 3d strength reaching more than 0.5MPa after solidification, 7d strength reaching more than 0.8MPa, water stability coefficient reaching more than 0.9, wide application, and important social and economic benefits and environmental benefits, and meets the backfill requirements of various projects. The fluidized soil can be used for backfilling a narrow space in engineering, and no wastewater, waste residue or mud cake is generated in the whole preparation process, so that the purpose of full resource utilization is achieved. In addition, the fluidized soil can be used for nearby large-scale digestion and treatment of shield slag soil, thereby changing waste into valuables and greatly improving the added value of the fluidized soil.
Drawings
FIG. 1 is a graph showing the verification of the impermeability of the fluidized soil prepared from the undisturbed shield slag in embodiment 1 of the present invention after solidification for 3 d.
FIG. 2 is a graph showing the verification of the impermeability of the fluidized soil prepared from the undisturbed shield slag in example 5 of the present invention after solidification for 3 d.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
Generally, shield muck is mainly divided into slurry balance shield, earth pressure balance shield and hard rock TBM shield according to different construction modes. The initial water content of the slurry balance shield slag soil is higher, and the separation treatment process is also mature. The soil pressure balance shield muck is different from the slurry state of the slurry balance shield muck, the initial water content of the soil pressure balance shield muck is usually between 30% and 50%, the soil pressure balance shield muck is mainly in a soft plastic and fluid plastic state and is in a paste state, the apparent density, the water content, the porosity, the grain composition, the permeability and the like are quite different, and the traditional dehydration and screening are extremely difficult. For example, the problems of low efficiency, high energy consumption and high cost exist in the dehydration by mechanical or physical methods, and the filter press and the centrifuge are suitable for the condition without coarse particles; the soil pressure balance shield has small residue and soil permeability, so that the geotechnical or vacuum preloading efficiency is low; and the drying method has low efficiency and very high cost. There is no effective method for dewatering the earth pressure balance shield residue soil.
Based on the above, the specific embodiment provides early-strength water-resistant flowing soil based on undisturbed shield slag soil, which comprises the following raw materials in percentage by mass: 78 to 99 percent of undisturbed shield slag soil slurry, 0.2 to 10.5 percent of alkali-activated cementing material, 0.2 to 5.9 percent of cement, 0.03 to 1.5 percent of stone powder, 0.02 to 2.0 percent of gypsum and 0.55 to 2.1 percent of reinforcing agent.
The undisturbed shield residue soil is the undisturbed residue soil which is not dehydrated and screened in the ground residue soil pool and is transported or pumped to the ground residue soil pool by a screw conveyor, a belt conveyor and a track residue soil truck after the front soil body is cut by a cutter head of the shield machine.
The undisturbed muck is one or more of earth pressure balance shield muck or slurry balance shield muck.
Preferably, the undisturbed slag soil is waste mud generated in the construction of a cast-in-place pile, an underground diaphragm wall and the like of a subway station and an accessory structure.
The water content of the undisturbed shield slag soil slurry is more than 60%, and the undisturbed shield slag soil slurry is prepared by adding water.
The alkali-activated cementing material comprises the following raw materials in percentage by mass: 60-90% of a gelling component and 10-40% of an alkali-activator.
The gelling component is one or more of blast furnace slag, fly ash, silica fume, steel slag, natural volcanic ash and phosphorous slag.
The fineness of the gel component is more than 200 meshes.
The alkali-activated agent is one or more of quicklime, sodium carbonate, sodium silicate and sodium hydroxide.
The calcium content of the quicklime is more than 75%, and the fineness is more than 100 meshes.
The sodium carbonate is in powder form, and the fineness is more than 100 meshes.
The sodium silicate is in powder form, the modulus is 2.0-3.2, and the fineness is more than 100 meshes.
The sodium hydroxide is solid flaky analytically pure, and the purity is more than 99%.
The stone powder is one or more of natural stone powder and construction waste regenerated micro powder, and the fineness is more than 200 meshes.
The gypsum is one or more of natural gypsum, desulfurized gypsum and phosphogypsum, and the fineness is more than 200 meshes.
The reinforcing agent is one or more of sodium metaaluminate, sodium sulfate, aluminum sulfate, polyaluminum chloride and calcium chloride, and is solid particles or powder.
The fluidized soil can be prepared by the following method:
mixing the undisturbed shield slag soil with water to prepare undisturbed shield slag soil slurry with the water content of more than 60%, and uniformly mixing the undisturbed shield slag soil slurry with alkali-activated cementing materials, cement, gypsum, stone powder and reinforcing agents.
The fluidized soil can be backfilled by adopting a pumping or pouring mode.
The early-strength water-resistant type fluidized soil based on the undisturbed shield slag soil can be applied to backfilling of foundation trenches, holes or other narrow spaces of pipe galleries, buildings, track traffic engineering and the like.
The concrete implementation mode also comprises undisturbed shield slag soil flowing soil prepared by the preparation method.
The following is a detailed description of related embodiments. The original shield muck in the following examples and comparative examples is taken from fully weathered slate shield muck material in a certain section of a long sand subway line 6, the initial water content is more than 35%, the mud content is more than 70%, and the original shield muck is added with water to prepare high-fluidity mud with 112% of water content for standby.
Example 1
The preparation method of the early-strength water-resistant type fluidized soil based on the undisturbed shield slag soil comprises the following raw materials in percentage by mass: 82.45% of undisturbed shield slag mud, 5.95% of blast furnace slag, 2.61% of fly ash, 0.51% of quicklime, 0.65% of sodium carbonate, 0.78% of sodium silicate, 2.65% of Portland cement, 1.20% of natural stone powder, 1.20% of natural gypsum, 1.05% of sodium metaaluminate and 0.95% of sodium sulfate;
and (3) mixing the raw materials, uniformly stirring, pouring into a mold, and naturally curing the film at room temperature.
Through tests, the 3d average compressive strength of the undisturbed shield slag soil flowing soil prepared in the embodiment 1 of the invention is 1.25MPa, and the 7d average compressive strength is 2.69MPa; the water stability coefficient is 0.98; volume water absorption 0.83%; the permeability coefficient of the fluidized soil after 28d solidification is less than 1.0x10 -7 cm/s; completely meets the corresponding index requirements in DBJ51/T188-2022 technical Standard for application of premixed fluidized curing soil engineering.
As shown in FIG. 1, FIG. 1 shows the test blocks of the fluidized soil prepared by the undisturbed shield residue soil in the embodiment 1 of the invention after solidification for 3 days, the middle part of each test block after solidification for 3 days is excavated, the wall thickness is reserved only about 1cm around, the excavated depth is about 2cm, and the impervious performance is observed by adding water. As can be seen from FIG. 1, after several days, the water in the middle groove portion evaporated, the water level decreased, and the bottom of the test block was not exuded, indicating that the fluidized soil had a good impermeability.
Example 2
The preparation method of the early-strength water-resistant type fluidized soil based on the undisturbed shield slag soil comprises the following raw materials in percentage by mass: 84.50% of undisturbed shield slag mud, 5.10% of blast furnace slag, 1.34% of silica fume, 0.48% of quicklime, 0.56% of sodium carbonate, 0.82% of sodium silicate, 3.68% of Portland cement, 0.65% of natural stone powder, 1.03% of natural gypsum, 1.21% of sodium metaaluminate and 0.63% of calcium chloride;
and (3) mixing the raw materials, uniformly stirring, pouring into a mold, and naturally curing the film at room temperature.
Through tests, the 3d average compressive strength of the undisturbed shield slag soil flowing soil prepared in the embodiment 2 of the invention is 0.97MPa, and the 7d average compressive strength is 1.16MPa; the water stability coefficient is 0.96; volume water absorption 1.05%; the permeability coefficient of the fluidized soil after 28d solidification is less than 1.0x10 -7 cm/s; completely meets the corresponding index requirements in DBJ51/T188-2022 technical Standard for application of premixed fluidized curing soil engineering.
Example 3
The preparation method of the early-strength water-resistant type fluidized soil based on the undisturbed shield slag soil comprises the following raw materials in percentage by mass: 86.90% of undisturbed shield slag mud, 4.18% of blast furnace slag, 0.53% of steel slag, 0.45% of quicklime, 0.58% of sodium carbonate, 0.94% of sodium silicate, 3.68% of silicate cement, 0.13% of natural stone powder, 1.03% of desulfurized gypsum, 0.96% of sodium sulfate and 0.62% of polyaluminium chloride;
and (3) mixing the raw materials, uniformly stirring, pouring into a mold, and naturally curing the film at room temperature.
Through tests, the 3d average compressive strength of the undisturbed shield slag soil flowing soil prepared in the embodiment 3 of the invention is 0.84MPa, and the 7d average compressive strength is 1.05MPa; the water stability coefficient is 0.93; volume water absorption 1.20%; the permeability coefficient of the fluidized soil after 28d solidification is less than 1.0x10 -7 cm/s; completely meets the corresponding index requirements in DBJ51/T188-2022 technical Standard for application of premixed fluidized curing soil engineering.
Example 4
The preparation method of the early-strength water-resistant type fluidized soil based on the undisturbed shield slag soil comprises the following raw materials in percentage by mass: 91.20% of undisturbed shield slag mud, 3.23% of blast furnace slag, 0.51% of quicklime, 0.56% of sodium carbonate, 0.61% of sodium silicate, 2.56% of silicate cement, 0.32% of natural stone powder, 0.16% of desulfurized gypsum and 0.85% of sodium metaaluminate;
and (3) mixing the raw materials, uniformly stirring, pouring into a mold, and naturally curing the film at room temperature.
Measured byIn the test, the 3d average compressive strength of the undisturbed shield slag soil fluidization soil prepared in the embodiment 4 of the invention is 0.61MPa, and the 7d average compressive strength is 0.93MPa; the water stability coefficient is 0.95; the volume water absorption rate is 1.45%; the permeability coefficient of the fluidized soil after 28d solidification is less than 1.0x10 -7 cm/s; completely meets the corresponding index requirements in DBJ51/T188-2022 technical Standard for application of premixed fluidized curing soil engineering.
Example 5
The preparation method of the early-strength water-resistant type fluidized soil based on the undisturbed shield slag soil comprises the following raw materials in percentage by mass: 92.00% of undisturbed shield slag mud, 3.16% of blast furnace slag, 0.41% of quicklime, 0.49% of sodium carbonate, 0.58% of sodium silicate, 1.96% of Portland cement, 0.09% of construction waste micropowder, 0.08% of phosphogypsum and 1.23% of aluminum sulfate;
and (3) mixing the raw materials, uniformly stirring, pouring into a mold, and naturally curing the film at room temperature.
Through tests, the 3d average compressive strength of the undisturbed shield slag soil flowing soil prepared in the embodiment 5 of the invention is 0.53MPa, and the 7d average compressive strength is 0.84MPa; the water stability coefficient is 0.91; volume water absorption 1.36%; the permeability coefficient of the fluidized soil after 28d solidification is less than 1.0x10 -7 cm/s; completely meets the corresponding index requirements in DBJ51/T188-2022 technical Standard for application of premixed fluidized curing soil engineering.
As shown in FIG. 2, FIG. 2 shows the test blocks of the fluidized soil prepared by the undisturbed shield residue soil in example 5 of the invention after solidification for 3d, the middle part of each test block after solidification for 3d is excavated, the wall thickness is only reserved at the periphery of about 1cm, the excavated depth is about 2cm, and the impervious performance is observed by adding water. As can be seen from FIG. 2, after several days, the water in the middle groove portion evaporated, the water level decreased, and the bottom of the test block was not exuded, indicating that the fluidized soil had a good impermeability.
Comparative example 1
A preparation method of early-strength water-resistant type fluidized soil based on undisturbed shield slag soil, which is taken as a comparative example of the embodiment 1 of the invention. The fluidized soil consists of the following raw materials: the raw shield slag mud, blast furnace slag, fly ash, quicklime, sodium carbonate, sodium silicate, portland cement, natural stone powder and natural gypsum are used in the same amount as in example 1;
and (3) mixing the raw materials, uniformly stirring, pouring into a mold, and naturally curing the film at room temperature.
Through tests, the 3d average compressive strength of the undisturbed shield slag soil fluidization soil prepared in the comparative example 1 is 0.26MPa, the 7d average compressive strength is 0.38MPa, and the 3d average compressive strength value and the 7d average compressive strength value of the fluidization soil prepared in the example 1 are far lower than those of the fluidization soil prepared in the example 1.
Comparative example 2
A preparation method of early-strength water-resistant type fluidized soil based on undisturbed shield slag soil is used as a comparative example of examples 1-5 of the invention. The fluidized soil consists of the following raw materials in percentage by mass: the method comprises the steps of mixing and stirring the raw materials uniformly, pouring the raw materials into a mold, and naturally curing the film at room temperature.
Through tests, when the mixing amount of the original shield slag soil slurry is 92% and the mixing amount of the silicate cement is 8%, the 3d average compressive strength of the original shield slag soil fluidized soil prepared in the comparative example 2 is 0.08MPa, and the 7d average compressive strength is 0.13MPa; when the mixing amount of the original shield slag soil slurry is 82 percent and the mixing amount of the silicate cement is 18 percent, the 3d average compressive strength of the original shield slag soil fluidized soil prepared in the comparative example 2 is 0.17MPa, and the 7d average compressive strength is 0.24MPa.
In addition, the invention has the following other beneficial effects:
(1) The treatment process is simple, the cost is low, pretreatment of undisturbed shield slag soil is not needed, and the additional value of the shield slag soil is greatly improved.
(2) Aiming at different types of shield residue soil slurry, the slurry can be prepared into fluidized soil, and can be popularized and copied.
(3) The method changes the traditional disposal means of shield muck mud by means of outward transportation and disposal, and avoids the safety risk and environmental hazard caused by muck stockpiling.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
Claims (10)
1. The early strength water-resistant type fluidized soil based on the undisturbed shield slag soil is characterized by comprising the following raw materials in percentage by mass: 78 to 99 percent of undisturbed shield slag soil slurry, 0.2 to 10.5 percent of alkali-activated cementing material, 0.2 to 5.9 percent of cement, 0.03 to 1.5 percent of stone powder, 0.02 to 2.0 percent of gypsum and 0.55 to 2.1 percent of reinforcing agent.
2. The early strength water-resistant type fluidized soil based on undisturbed shield slag soil, as claimed in claim 1, wherein the water content of the undisturbed shield slag soil slurry is greater than 60%, and the undisturbed shield slag soil is prepared by adding water.
3. The early strength water-resistant type fluidized soil based on undisturbed shield slag soil, as claimed in claim 1, is characterized in that the alkali-activated cementing material consists of the following raw materials in percentage by mass: 60-90% of a gelling component and 10-40% of an alkali-activator.
4. The early strength, water resistant, fluidized soil based on undisturbed shield slag soil of claim 3, wherein the cementitious component is one or more of blast furnace slag, fly ash, silica fume, steel slag, natural pozzolan, phosphorous slag.
5. The early strength, water tolerant, fluidized soil based on undisturbed shield slag of claim 3, wherein the alkali-activator is one or more of quicklime, sodium carbonate, sodium silicate, sodium hydroxide.
6. The early strength water-resistant type fluidized soil based on undisturbed shield slag soil according to claim 1, wherein the stone powder is one or more of natural stone powder and construction waste regenerated micro powder.
7. The early strength water-tolerant fluidizing soil based on undisturbed shield slag soil of claim 1, wherein the gypsum is one or more of natural gypsum, desulfurized gypsum, phosphogypsum.
8. The early strength water-tolerant fluidizing soil based on undisturbed shield slag soil of claim 1, wherein the reinforcing agent is one or more of sodium metaaluminate, sodium sulfate, aluminum sulfate, polyaluminum chloride, and calcium chloride.
9. The method for preparing the early strength water-resistant type fluidized soil based on the undisturbed shield slag soil, which is disclosed in any one of claims 1-8, is characterized in that the undisturbed shield slag soil is mixed with water to prepare undisturbed shield slag soil slurry with the water content of more than 60%, and then the undisturbed shield slag soil slurry is uniformly mixed with alkali-activated cementing material, cement, gypsum, stone powder and reinforcing agent.
10. The use of the early strength, water-tolerant, fluidized soil based on undisturbed shield slag soil of any one of claims 1-8 as an engineered small space backfill material.
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