CN114230224A - Low-carbon anti-permeability type full-solid waste grouting material and preparation method and application thereof - Google Patents
Low-carbon anti-permeability type full-solid waste grouting material and preparation method and application thereof Download PDFInfo
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Classifications
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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
- 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
- C04B40/0039—Premixtures of ingredients
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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
- 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
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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
- C04B7/00—Hydraulic cements
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- C04B7/147—Metallurgical slag
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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
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- C04B7/24—Cements from oil shales, residues or waste other than slag
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- C—CHEMISTRY; METALLURGY
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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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
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- 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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- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
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- C—CHEMISTRY; METALLURGY
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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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
- C04B2201/50—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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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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
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- Chemical & Material Sciences (AREA)
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- Inorganic Chemistry (AREA)
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- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of urban subway shield/TBM (tunnel boring machine) wall rear synchronous grouting materials, and relates to a low-carbon anti-permeability type full-solid waste grouting material as well as a preparation method and application thereof. The full-solid waste grouting material comprises the following components in parts by weight: 270 portions of base material 160-; 0-12 parts of composite additive, excluding 0; 40-70 parts of water. The base material comprises the following components in parts by weight: 2-7 parts of desulfurized gypsum, 20-40 parts of furnace slag, 5-13 parts of bentonite, 30-60 parts of fly ash, 7-17 parts of mineral powder and 60-180 parts of fine aggregate. The composite additive comprises the following components: a polycarboxylic acid water reducing agent, a high polymer and an excitant. According to the invention, the alkali excitation technology is adopted, so that high value-added utilization of bulk solid wastes is realized, and the low-carbon anti-permeability type full-solid waste grouting material is prepared. The material is used for synchronous grouting behind the shield/TBM wall of the urban subway, can realize green filling behind the tunnel wall, and simultaneously relieves the problem of environmental pollution caused by stacking of a large amount of solid wastes.
Description
Technical Field
The invention belongs to the technical field of urban subway shield/TBM (tunnel boring machine) wall rear synchronous grouting materials, and mainly relates to a low-carbon anti-permeability full-solid waste grouting material and a preparation method thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In the aspect of subway tunnel construction, tunnel excavation by a shield/TBM method has the advantages of small influence on ground traffic, high automation degree, remarkably shortened construction period, high stratum applicability and the like, so that the tunnel excavation method is widely applied to tunnel construction. However, urban subways face a high risk of disasters in the excavation construction process, wherein cracking and water leakage of the segment lining are the most common types of disasters in the construction and operation periods of the subways. In the shield/TBM ring-by-ring construction process, the shield tail is separated from the segment lining, so that a gap is generated between the segment and the stratum, and if the gap of the shield tail is not filled, the displacement of the peripheral stratum to the segment is inevitably generated along with the disturbance effect of shield/TBM tunneling on the peripheral stratum, so that the double problems of stratum deformation and stress of a segment lining structure are caused.
Synchronous grouting is a technology for filling a gap while a cutter head is pushed forward and the gap between the shield tail and the duct piece is formed through a synchronous grouting system and grouting holes on the shield tail and the duct piece. The synchronous grouting technology solves the problem of time lag between the generation of the shield tail gap and grouting filling to the maximum extent, thereby effectively relieving stratum deformation and fixing the position of the segment lining, and avoiding the cracking of the segment due to uneven stress while ensuring the uniform stress of the segment lining. In addition, the shield/TBM synchronous grouting reinforcing ring is used as a first layer of protective ring for water leakage of the tunnel, and the impermeability of the shield tunnel is greatly improved.
The commonly used grouting reinforcement material is ordinary portland cement single-liquid slurry, and cement has the defects of low calculus rate, high hydration heat and easy generation of cracks, so that the structural strength and the impermeability are greatly reduced, and the treatment effect of the seepage water engineering is seriously influenced. At the same time, the production of cement will produce a large amount of carbon emissions, which is reported to be about 33.4 million tons in 2020 due to the production of cement, which is contrary to the urgent situation of global climate control and the goal of reducing carbon emissions.
Disclosure of Invention
In view of the above problems, the main object of the present invention is to further improve the anti-permeability effect of the synchronous grouting material and reduce the carbon emission of the grouting material. The invention provides a low-carbon anti-permeability full-solid waste synchronous grouting material and a preparation method thereof. The all-solid-waste grouting material has the performances of strong impermeability, high toughness, long-term hydration and the like, and is beneficial to realizing high value-added utilization of bulk solid wastes.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides a composite additive for a low-carbon impervious type full-solid waste grouting material, which comprises the following components in part by weight: composite alkali activator, high-efficiency water reducing agent and fiber.
The invention researches a novel green material, and is applied to the engineering to realize safe excavation and green, low-carbon and sustainable development of the tunnel.
The second aspect of the invention provides a preparation method of a composite additive for a low-carbon anti-permeability type full-solid waste grouting material, which comprises the following steps:
and uniformly mixing the composite alkaline activator, the high-efficiency water reducing agent and the fiber to obtain the composite alkaline activator.
The third aspect of the invention provides a base material for a low-carbon anti-permeability type full-solid waste grouting material, which comprises the following raw materials in parts by weight: 2-7 parts of desulfurized gypsum, 20-40 parts of furnace slag, 5-13 parts of bentonite, 30-60 parts of fly ash, 7-17 parts of mineral powder and 60-180 parts of fine aggregate.
The fourth aspect of the invention provides a low-carbon anti-permeability type full-solid waste grouting material which is prepared from the following raw materials in parts by weight: 270 portions of the base material 160; 0-12 parts of the composite additive, excluding 0; 40-70 parts of water.
The fifth aspect of the invention provides a preparation method of a low-carbon impervious type full-solid waste grouting material, which comprises the following steps:
weighing various raw materials according to the weight ratio;
uniformly mixing desulfurized gypsum, furnace slag, bentonite, fly ash, mineral powder and fine aggregate in proportion to prepare a matrix material;
and uniformly mixing the base material, the composite additive and water in proportion to obtain the low-carbon anti-permeability type full-solid waste grouting material.
In a sixth aspect of the invention, the application of the above-mentioned all-solid-waste grouting material in impervious filling is provided.
The invention has the beneficial effects that:
(1) the invention aims to utilize the high added value of the bulk solid waste, prepare the bulk solid waste into the shield synchronous grouting material, and is used for the shield/TBM synchronous anti-seepage grouting of the urban subway, and simultaneously relieve the problem of environmental pollution caused by the large amount of stacked solid waste.
(2) The invention provides a composite additive aiming at the problems of strong potential activity and weak hydration capability of a full-solid waste cementing material system. The potential gelling activity of the matrix material is excited by the excitation toughening effect of the composite additive, the gelling structure of the gelled body is recombined, and the cementing interconnection degree of the gelled body is improved, so that the impermeability and toughness of the grouting material are enhanced, and the engineering application conditions of the matrix material are endowed.
(3) The operation method is simple, low in cost, universal and easy for large-scale production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of shield/TBM synchronous impermeable synchronous grouting. From the outermost circle, the first circle in fig. 1 represents a shield shell, which is referred to as a shield shell for short, the first circle represents grouting material filled in a gap at the tail of the shield, namely the range of synchronous grouting in the invention, the second circle represents a tunnel segment, and the innermost circle represents a tunnel.
FIG. 2 is a microscopic electron microscope scanning image of the low-carbon impervious type all-solid-waste material of the embodiment of the invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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.
In a first aspect, the invention provides a composite admixture comprising the following components: composite alkali activator, high-efficiency water reducing agent and fiber.
Slag, mineral powder and fly ash are solid emissions generated in high-temperature industrial processes, amorphous glass bodies with potential gelling activity are formed in high-temperature reaction and cooling processes, the glass bodies hardly react with water, but are depolymerized and re-polymerized into hardened colloids under the alkaline environment provided by a composite alkaline activator, and the macroscopic representation shows that the strength is continuously increased. The high-efficiency water reducing agent can be dissociated into macromolecular anions in the solution, the main chain of the high-efficiency water reducing agent is adsorbed on the surfaces of solid waste particles and hydration products, so that the electrostatic repulsion and the steric hindrance repulsion between the particles are increased, the free water in the system is increased, and the flowing property of the system is improved. The fiber used in the invention is polyacrylonitrile fiber, which can improve the macroscopic mechanical property of a gelling system, maintain the volume stability, relieve the stress concentration and inhibit the expansion of microcracks. In conclusion, the inorganic-organic-fiber composite additive can well improve the macroscopic mechanical property, the fluidity, the volume stability and the anti-permeability durability of the green material.
In some embodiments, the mass ratio of the composite alkaline activator, the high-efficiency water reducing agent and the fiber is as follows: 0-8:0-3:0-1.
Further, the mass ratio of the composite alkaline excitant to the high-efficiency water reducing agent to the fiber is as follows: 2-8:0-2:0-0.75.
Further, the mass ratio of the composite alkaline excitant to the high-efficiency water reducing agent to the fiber is as follows: 2-6:0-1.5:0-0.5.
Further, the mass ratio of the composite alkaline excitant to the high-efficiency water reducing agent to the fiber is as follows: 2-4:0-1.5:0-0.5.
In some embodiments, the composite alkaline activator consists of sodium hydroxide, sodium carbonate, and sodium sulfate.
Furthermore, in the exciting agent, the mass ratio of sodium hydroxide, sodium carbonate and sodium sulfate is 3:2: 1.
In some embodiments, the fibers are polyacrylonitrile fibers.
In a second aspect, the invention provides a preparation method of the composite admixture, which comprises the following steps:
mixing the composite alkaline activator, the high-efficiency water reducing agent and the fiber according to a certain proportion, and uniformly stirring to obtain the composite alkaline activator.
In a third aspect, the invention provides a base material, which comprises the following components in parts by weight: 2-7 parts of desulfurized gypsum, 20-40 parts of furnace slag, 5-13 parts of bentonite, 30-60 parts of fly ash, 7-17 parts of mineral powder and 60-180 parts of fine aggregate.
Wherein the desulfurized gypsum, the furnace slag, the fly ash and the mineral powder form a composite gelling system, the bentonite plays a role in improving the stability of the system, and the fine aggregate plays a role in supporting a framework.
The addition ratio of bentonite and fine aggregate should be determined according to the composite gelling system. The requirement of synchronous anti-permeability grouting of an urban subway shield/TBM can not be well met only by using a composite gelling system to prepare a base material. The all-solid-waste system matrix material has good compatibility, has hydration synergistic effect, and can meet the strength requirement of synchronous grouting under the action of the composite alkaline activator. The bentonite is highly dispersed in water and is lapped into a net shape, and free water in a system is bound, so that the matrix material is endowed with better stability; after the bentonite meets water, the mineral crystal layer space of the bentonite is filled with water molecules, so that the bentonite macroscopically shows a certain expansion characteristic, the later-stage volume retraction problem of a slurry concretion body can be effectively relieved, and the impermeability of the material is greatly improved. Meanwhile, the solid waste material is used as an industrial byproduct, and the carbon emission caused by the production of the solid waste material is greatly reduced compared with that of a cement material. The carbon emission of the total solid waste matrix material is reduced by 78% on average compared with that of cement, the addition of the fine aggregate further reduces the carbon emission of the total solid waste system, and finally the carbon emission of the total solid waste grouting material is only 12.5% of that of the cement material, so that the method meets the low-carbon, green and sustainable development concept and the aim of reducing the carbon emission.
The four reasons for solid waste were chosen:
the synchronous grouting of the shield is carried out by utilizing the slag, so that the problems of stacking of waste slag and environmental pollution can be efficiently solved, and great economic benefit can be brought.
Mineral powder is a mineral with latent hydraulic properties. The chemical composition contains a large amount of CaO (35-50%) and active SiO2And Al2O3. Active SiO2And Al2O3Under the excitation of CaO, it has hydraulicity, and when it is matched with alkaline exciting agent, it can produce strong hydration action, so that it can greatly raise the strength of system.
The fly ash is a residual product after pulverized coal combustion in a thermal power plant, and belongs to industrial waste residues. The main chemical components of the ceramic are silicon-aluminum compounds, and the content of the active amorphous glass body is up to 52-89%, so that the volcanic ash reaction can be carried out under the alkali excitation, and calcium silicate hydrate and calcium aluminate hydrate with the gelling property are generated. In addition, the glass beads in the fly ash can fill the gaps among the mixed slurry particles, improve the rheological property of the slurry and play a role in reducing water, thereby improving various performances of the material.
The desulfurized gypsum is a byproduct of flue gas desulfurization in thermal power generation. The density of the slurry concretion body can be increased through the self reaction, so that the characteristics of improving the early strength of the base material are achieved, the erosion resistance and the impermeability of the slurry concretion body can be well improved, and the comprehensive utilization value is achieved.
In a fourth aspect, the invention provides a low-carbon impervious type full-solid waste grouting material which comprises the following components in parts by weight: 270 parts of the base material 160; 0-12 parts of the composite additive, excluding 0; 40-70 parts of water.
In some embodiments, the mass percentage of the composite alkaline activator in the composite admixture in the solid waste grouting material is 0-1.4%.
High-temperature industrial solid wastes such as furnace slag, fly ash, mineral powder and the like have potential gelling activity, and amorphous glass bodies contained in the high-temperature industrial solid wastes are depolymerized and polymerized into hardening colloid under an alkaline environment. This reaction causes a slight volume expansion of the conglomerate body. In addition, too high or too low content of alkali activator is not good for sufficient gelation of the material, so the strength of the system can be adjusted by adjusting the amount of activator. When the content of the alkali-activator is higher than 1.4%, the strength of the stone body is reduced and the 28d expansion rate is larger. Therefore, the mass fraction of the composite alkaline activator in the material system is more reasonable between 0 and 1.4 percent.
In some embodiments, the mass percentage of the high-efficiency water reducing agent in the composite admixture in the solid waste grouting material is 0-0.7%.
Further, the mass percentage of the high-efficiency water reducing agent in the performance optimizing agent in the solid waste grouting material is 0-0.7%.
The high-efficiency water reducing agent has electrostatic repulsion effect, steric hindrance effect and lubricating effect, and can increase the fluidity of cement slurry from the three angles. The experimental result shows that one thousandth of the high-efficiency water reducing agent has great influence on the fluidity of the system. When the content of the high-efficiency water reducing agent is more than 0.7%, the setting time of the system is too long, and the engineering requirement of the slurry cannot be met. Therefore, the content of the high-efficiency water reducing agent of the low-carbon anti-permeability full-solid-waste synchronous grouting material is less than or equal to 0.7 percent.
In some embodiments, the mass percentage of the fibers in the composite admixture in the solid waste grouting material is 0-0.2%.
Polyacrylonitrile fibers have been reported to have a significant improvement effect on the mechanical strength of materials, and the reason for this effect is that the fibers are uniformly dispersed in a material system, so that cracks and dimensions inside the material can be reduced, the compressive strength and the flexural strength of the material system are further improved, and the toughness of the material is significantly improved. When the content of the fiber is more than 0.2%, the improvement effect of the continuous increase of the content of the fiber on the mechanical property of the system is not obvious. Therefore, in consideration of the economy of materials, the fiber content of the low-carbon impervious type full-solid waste synchronous grouting material should be less than or equal to 0.2%.
In some embodiments, the low-carbon impervious type full-solid waste synchronous grouting material comprises the following components in parts by weight: 160 parts of base material, 2 parts of composite alkaline activator, 0 part of high-efficiency water reducing agent, 0.25 part of fiber and 40 parts of water.
In some embodiments, the low-carbon impervious type full-solid waste synchronous grouting material comprises the following components in parts by weight: 160 parts of base material, 0 part of composite alkaline activator, 3 parts of high-efficiency water reducing agent, 1 part of fiber and 70 parts of water.
In some embodiments, the low-carbon impervious type full-solid waste synchronous grouting material comprises the following components in parts by weight: 215 parts of matrix material, 4 parts of composite alkaline activator, 1 part of high-efficiency water reducing agent, 0.25 part of fiber and 55 parts of water.
In some embodiments, the low-carbon impervious type full-solid waste synchronous grouting material comprises the following components in parts by weight: 215 parts of matrix material, 8 parts of composite alkaline activator, 2 parts of high-efficiency water reducing agent, 0.75 part of fiber and 55 parts of water.
In some embodiments, the low-carbon impervious type full-solid waste synchronous grouting material comprises the following components in parts by weight: 270 parts of base material, 6 parts of composite alkaline activator, 1 part of high-efficiency water reducing agent, 0 part of fiber and 70 parts of water.
In some embodiments, the low-carbon impervious type full-solid waste synchronous grouting material comprises the following components in parts by weight: 270 parts of base material, 2 parts of composite alkaline activator, 1.5 parts of high-efficiency water reducing agent, 0.5 part of fiber and 40 parts of water.
In a fifth aspect, the invention provides a preparation method of the all-solid-waste grouting material, which comprises the following steps:
weighing various raw materials according to the weight ratio;
uniformly mixing desulfurized gypsum, furnace slag, bentonite, fly ash, mineral powder and fine aggregate according to a proportion to prepare a grouting matrix material;
and uniformly mixing the matrix material, the composite additive and water in proportion to prepare the low-carbon anti-permeability full-solid-waste synchronous grouting material.
In some embodiments, the fineness of the matrix material is greater than 425 mesh and the fine aggregate is medium fine sand with an average particle size of 0.25mm to 0.5 mm.
In a sixth aspect, the invention provides an application of the all-solid-waste grouting material in synchronous seepage prevention.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
In the following examples, the composite alkaline activator was composed of sodium hydroxide, sodium carbonate and sodium sulfate in a mass ratio of 3:2: 1.
The high-efficiency water reducing agent is a Jinnit brand polycarboxylate water reducing agent and is purchased from Jinnan Xinyi Jia chemical company Limited.
The fiber is polyacrylonitrile fiber.
Example 1
A low-carbon impervious full-solid waste synchronous grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: grinding solid components except the fine aggregate in the base material by using a planetary ball mill until the fineness is more than 425 meshes, and screening by using a screening machine for later use in an experiment;
step two: weighing raw materials according to mass fraction, wherein the raw materials comprise 160 parts of base material, 2 parts of composite alkaline activator, 0 part of high-efficiency water reducing agent, 0.25 part of fiber and 40 parts of water.
The base material comprises the following components in parts by weight: 2 parts of desulfurized gypsum, 30 parts of furnace slag, 5 parts of bentonite, 30 parts of fly ash, 7 parts of mineral powder and 60 parts of fine aggregate.
Step three: and (3) placing the weighed raw materials into a stirrer for fully stirring.
Step four: and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The low-carbon anti-permeability type full-solid waste synchronous grouting material prepared in the embodiment is subjected to slurry fluidity, stone volume shrinkage, stone permeability coefficient and stone compression and rupture strength tests, and the test results are shown in tables 1-1, 1-2, 1-3 and 1-4:
TABLE 1-1 slurry flowability of low-carbon impervious type all-solid-waste synchronous grouting material
The size of the slurry fluidity can visually reflect the flowing capability of the slurry. The greater the fluidity, the greater the ability of the slurry to flow and the greater the corresponding diffusion range. For synchronous grouting, the proper slurry fluidity is a prerequisite for ensuring that the material can fully exert the filling effect.
TABLE 1-2 shrinkage of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The shrinkage rate of the stone-forming body 28d can visually reflect the volume change of the stone-forming body. When the numerical value is positive, the shrinkage of the stone body volume is shown; when the value is negative, the expansion of the volume of the concretion body is indicated. The experimental result shows that the calculus body slightly shrinks in volume under the proportion.
TABLE 1-3 permeability coefficient of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The permeability coefficient can visually reflect the water permeability of the stone body. The larger the permeability coefficient is, the stronger the water permeability of the material is, and the poorer the impermeability is; the smaller the permeability coefficient, the weaker the water permeability of the material, and the better the impermeability. The experimental result shows that the 28d anti-permeability capability of the calculus body is stronger under the mixture ratio.
TABLE 1-4 compression and rupture strengths of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The compressive and flexural strength can visually reflect the capability of the stone-forming body to resist the damage of external force. The higher the compressive strength is, the stronger the capability of the stone body against water pressure and surrounding rock pressure is; the higher the breaking strength, the better the toughness of the stone body, and the stronger the ability to absorb energy during plastic deformation and fracture. The test result shows that the 28d compressive rupture strength of the stone body is stronger under the condition of the mixture ratio, and the rupture ratio is 0.22. Compared with the traditional cement-based material, the grouting material has higher folding-pressing ratio.
Example 2
A low-carbon impervious full-solid waste synchronous grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: grinding solid components except the fine aggregate in the base material by using a planetary ball mill until the fineness is more than 425 meshes, and screening by using a screening machine for later use in an experiment;
step two: weighing raw materials according to mass fraction, wherein the raw materials comprise 160 parts of base material, 0 part of composite alkaline activator, 3 parts of high-efficiency water reducing agent, 1 part of fiber and 70 parts of water.
The base material comprises the following components in parts by weight: 7 parts of desulfurized gypsum, 20 parts of furnace slag, 3 parts of bentonite, 50 parts of fly ash, 17 parts of mineral powder and 120 parts of fine aggregate.
Step three: and (3) placing the weighed raw materials into a stirrer for fully stirring.
Step four: and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The low-carbon anti-permeability type full-solid waste synchronous grouting material prepared in the embodiment is subjected to slurry fluidity, stone volume shrinkage, stone permeability coefficient and stone compression and rupture strength tests, and the test results are shown in tables 2-1, 2-2, 2-3 and 2-4:
TABLE 2-1 fluidity of low-carbon impervious full-solid-waste synchronous grouting material
Experimental results show that the fluidity of the slurry can be greatly improved by simultaneously improving the water-to-gel ratio of the material and adding more water reducing agent, and the addition amounts of water and the water reducing agent in the system are reduced.
TABLE 2-2 shrinkage of the concretion body 28d of the low-carbon impervious full-solid-waste synchronous grouting material
The experiment result shows that the stone body volume is greatly shrunk because the compound alkaline exciting agent is not added and the addition proportion of the matrix material and the water is small.
TABLE 2-3 permeability coefficient of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the hydration degree of the system is low and the pores of the calculus body are more because the compound alkaline exciting agent is not added, so that the permeability coefficient of the 28d calculus body is larger.
TABLE 2-4 compression and rupture strengths of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the hydration degree of the system is low, the pores of the stone bodies are more, and the capacity of resisting the damage of external force is weak because the compound alkaline excitant is not added, so that the 28d compressive rupture strength is low. In addition, because of the addition of high-content fibers, the compression ratio of the calculus body in the ratio is high and is 0.255.
Example 3
A low-carbon impervious full-solid waste synchronous grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: grinding solid components except the fine aggregate in the base material by using a planetary ball mill until the fineness is more than 425 meshes, and screening by using a screening machine for later use in an experiment;
step two: weighing raw materials according to mass fraction, wherein the raw materials comprise 215 parts of base material, 4 parts of composite alkaline activator, 1 part of high-efficiency water reducing agent, 0.25 part of fiber and 55 parts of water.
The base material comprises the following components in parts by weight: 4 parts of desulfurized gypsum, 30 parts of furnace slag, 9 parts of bentonite, 40 parts of fly ash, 12 parts of mineral powder and 120 parts of fine aggregate.
Step three: and (3) placing the weighed raw materials into a stirrer for fully stirring.
Step four: and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The low-carbon anti-permeability type full-solid waste synchronous grouting material prepared in the embodiment is subjected to slurry fluidity, stone volume shrinkage, stone permeability coefficient and stone compression and rupture strength tests, and the test results are shown in tables 3-1, 3-2, 3-3 and 3-4:
TABLE 3-1 slurry flowability of low-carbon impervious full-solid-waste synchronous grouting material
Experimental results show that the slurry in the proportion has good fluidity and can meet the fluidity requirement of synchronous grouting engineering.
TABLE 3-2 shrinkage ratio of concretion body 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experiment result shows that the addition amount of the compound alkaline activator and the addition proportion of the matrix material and the water can cause the volume of the calculus body to slightly expand.
TABLE 3-3 permeability coefficient of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the appropriate amount of the composite alkaline activator and the appropriate addition proportion of the matrix material and the water can greatly improve the impermeability of the stone body.
TABLE 3-4 compression and rupture strengths of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the compressive and flexural strength of the stone-forming body can be greatly improved by the proper addition amount of the composite alkaline activator and the proper addition proportion of the matrix material and the water. In addition, because of the addition of a small amount of fiber, the folding pressure of the calculus body at the ratio is high and is 0.223.
Example 4
A low-carbon impervious full-solid waste synchronous grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: grinding solid components except the fine aggregate in the base material by using a planetary ball mill until the fineness is more than 425 meshes, and screening by using a screening machine for later use in an experiment;
step two: weighing raw materials according to mass fraction, wherein the raw materials comprise 215 parts of base material, 8 parts of composite alkaline activator, 2 parts of high-efficiency water reducing agent, 0.75 part of fiber and 55 parts of water.
The base material comprises the following components in parts by weight: 2 parts of desulfurized gypsum, 40 parts of furnace slag, 6 parts of bentonite, 60 parts of fly ash, 17 parts of mineral powder and 180 parts of fine aggregate.
Step three: and (3) placing the weighed raw materials into a stirrer for fully stirring.
Step four: and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The low-carbon anti-permeability type full-solid waste synchronous grouting material prepared in the embodiment is subjected to slurry fluidity, stone volume shrinkage, stone permeability coefficient and stone compression and rupture strength tests, and the test results are shown in tables 4-1, 4-2, 4-3 and 4-4:
TABLE 4-1 fluidity of low-carbon impervious full-solid-waste synchronous grouting material
Experimental results show that the slurry in the proportion has good fluidity and can meet the fluidity requirement of synchronous grouting engineering.
TABLE 4-2 shrinkage of the concretion body 28d of the low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the addition amount of the composite alkaline exciting agent is controlled during the proportioning design because the addition amount of the composite alkaline exciting agent is excessive, and the 28d stone body has larger volume expansion.
TABLE 4-3 permeability coefficient of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the anti-permeability of the 28d calculus body is reduced by adding more compound alkaline exciting agent.
TABLE 4-4 compression and rupture strengths of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the compression strength and the breaking strength of the 28d calculus body are reduced by adding more composite alkaline excitant. In addition, because of the addition of high content of fiber, the bending pressure of the calculus body is high under the proportion, and is 0.258.
Example 5
A low-carbon impervious full-solid waste synchronous grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: grinding solid components except the fine aggregate in the base material by using a planetary ball mill until the fineness is more than 425 meshes, and screening by using a screening machine for later use in an experiment;
step two: weighing raw materials according to mass fraction, wherein the raw materials comprise 270 parts of base material, 6 parts of composite alkaline activator, 1 part of high-efficiency water reducing agent, 0 part of fiber and 70 parts of water.
The base material comprises the following components in parts by weight: 4 parts of desulfurized gypsum, 20 parts of furnace slag, 8 parts of bentonite, 40 parts of fly ash, 7 parts of mineral powder and 60 parts of fine aggregate.
Step three: and (3) placing the weighed raw materials into a stirrer for fully stirring.
Step four: and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The low-carbon anti-permeability type full-solid waste synchronous grouting material prepared in the embodiment is subjected to slurry fluidity, stone volume shrinkage, stone permeability coefficient and stone compression and rupture strength tests, and the test results are shown in tables 5-1, 5-2, 5-3 and 5-4:
TABLE 5-1 fluidity of low-carbon impervious full-solid-waste synchronous grouting material
Experimental results show that the slurry in the proportion has good fluidity and can meet the fluidity requirement of synchronous grouting engineering.
TABLE 5-2 shrinkage of the stone body 28d of the low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the addition amount of the composite alkaline exciting agent is controlled during the proportioning design because the addition amount of the composite alkaline exciting agent is excessive, and the 28d stone body has larger volume expansion.
TABLE 5-3 permeability coefficient of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the anti-permeability of the 28d calculus body is reduced by adding more compound alkaline exciting agent.
TABLE 5-4 compression and rupture strengths of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the compression strength and the breaking strength of the 28d calculus body are reduced by adding more composite alkaline excitant. In addition, since no fiber is added, the folding pressure of the stone body at the ratio is relatively small and is 0.197.
Example 6
A low-carbon impervious full-solid waste synchronous grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: grinding solid components except the fine aggregate in the base material by using a planetary ball mill until the fineness is more than 425 meshes, and screening by using a screening machine for later use in an experiment;
step two: weighing raw materials according to mass fraction, wherein the raw materials comprise 270 parts of base material, 2 parts of composite alkaline activator, 1.5 parts of high-efficiency water reducing agent, 0.5 part of fiber and 40 parts of water.
The base material comprises the following components in parts by weight: 7 parts of desulfurized gypsum, 40 parts of furnace slag, 9 parts of bentonite, 50 parts of fly ash, 12 parts of mineral powder and 180 parts of fine aggregate.
Step three: and (3) placing the weighed raw materials into a stirrer for fully stirring.
Step four: and (5) placing the stirred material in an environment with 90% humidity and 25 ℃ for curing for 28 d.
The low-carbon anti-permeability type full-solid waste synchronous grouting material prepared in the embodiment is subjected to slurry fluidity, stone volume shrinkage, stone permeability coefficient and stone compression and rupture strength tests, and the test results are shown in tables 6-1, 6-2, 6-3 and 6-4:
TABLE 6-1 fluidity of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that when the adding proportion of the base material and the water is large, the fluidity of the slurry is still small even if the high efficiency water reducing agent is added. The adding amount of water should be properly increased to meet the fluidity requirement of the synchronous grouting project.
TABLE 6-2 shrinkage of concretion body 28d of low-carbon impervious full-solid-waste synchronous grouting material
The experimental result shows that the volume of the calculus body is slightly expanded by adding a small amount of the composite alkaline exciting agent and increasing the adding proportion of the matrix material and water.
TABLE 6-3 permeability coefficient of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
Experimental results show that the impermeability of the 28d calculus body is obviously enhanced by adding a small amount of the composite alkaline exciting agent and increasing the adding proportion of the matrix material and water.
TABLE 6-4 compression and rupture strengths of concretion 28d of low-carbon impervious full-solid-waste synchronous grouting material
Experimental results show that the compressive and flexural strength of the 28d calculus body is obviously enhanced by adding a small amount of the composite alkaline exciting agent and increasing the adding proportion of the matrix material and water. In addition, because of the addition of a small amount of fiber, the folding pressure of the calculus body in the proportion is high and is 0.237.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The composite additive for the low-carbon impervious full-solid waste grouting material is characterized by comprising the following components in percentage by weight: composite alkali activator, high-efficiency water reducing agent and fiber.
2. The composite additive for the low-carbon anti-permeability type all-solid-waste grouting material as defined in claim 1, wherein the mass ratio of the composite alkaline activator, the high-efficiency water reducing agent and the fiber is as follows: 0-8:0-3: 0-1;
or the mass ratio of the composite alkaline exciting agent to the high-efficiency water reducing agent to the fiber is as follows: 2-8:0-2: 0-0.75;
or the mass ratio of the composite alkaline exciting agent to the high-efficiency water reducing agent to the fiber is as follows: 2-6:0-1.5: 0-0.5;
or the mass ratio of the composite alkaline exciting agent to the high-efficiency water reducing agent to the fiber is as follows: 2-4:0-1.5:0-0.5.
3. The compound additive for the low-carbon impervious type full-solid waste grouting material as defined in claim 1, wherein the compound alkaline excitant consists of sodium hydroxide, sodium carbonate and sodium sulfate; preferably, in the activator, the mass ratio of sodium hydroxide, sodium carbonate and sodium sulfate is 3: 1.6-2.4:0.8-1.2.
4. The composite additive for the low-carbon impervious type all-solid-waste grouting material as claimed in claim 1, wherein the fiber is polyacrylonitrile fiber.
5. A preparation method of a composite additive for a low-carbon impervious type full-solid waste grouting material is characterized by comprising the following steps:
and uniformly mixing the composite alkaline activator, the high-efficiency water reducing agent and the fiber to obtain the composite alkaline activator.
6. A base material for a low-carbon impervious full-solid waste grouting material is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 2-7 parts of desulfurized gypsum, 20-40 parts of furnace slag, 5-13 parts of bentonite, 30-60 parts of fly ash, 7-17 parts of mineral powder and 60-180 parts of fine aggregate.
7. The low-carbon impervious type full-solid waste grouting material is characterized by comprising the following raw materials in parts by weight: 270 parts of the base material 160 as set forth in claim 6; 0 to 12 parts of the composite admixture of any one of claims 1 to 4, excluding 0; 40-70 parts of water.
8. The low-carbon impervious type all-solid-waste grouting material as claimed in claim 7, wherein the mass percentage of the composite alkaline excitant in the grouting material is 0-1.4%;
or the mass percentage of the high-efficiency water reducing agent in the grouting material is 0-0.7%;
or, the mass percentage of the fiber in the grouting material is 0-0.2%;
or the mass percentage of the high-efficiency water reducing agent in the solid waste grouting material is 0-0.35%;
or the low-carbon impervious full-solid waste grouting material is prepared from the following raw materials in parts by weight: 160 parts of base material, 2 parts of composite alkaline activator, 0 part of high-efficiency water reducing agent, 0.25 part of fiber and 40 parts of water;
or the low-carbon impervious full-solid waste grouting material is prepared from the following raw materials in parts by weight: 160 parts of a base material, 0 part of a composite alkaline activator, 3 parts of a high-efficiency water reducing agent, 1 part of fiber and 70 parts of water;
or the low-carbon impervious full-solid waste grouting material is prepared from the following raw materials in parts by weight: 215 parts of base material, 4 parts of composite alkaline activator, 1 part of high-efficiency water reducing agent, 0.25 part of fiber and 55 parts of water;
or the low-carbon impervious full-solid waste grouting material is prepared from the following raw materials in parts by weight: 215 parts of base material, 8 parts of composite alkaline activator, 2 parts of high-efficiency water reducing agent, 0.75 part of fiber and 55 parts of water;
or the low-carbon impervious full-solid waste grouting material is prepared from the following raw materials in parts by weight: 270 parts of a base material, 6 parts of a composite alkaline activator, 1 part of a high-efficiency water reducing agent, 0 part of fiber and 70 parts of water;
or the low-carbon impervious full-solid waste grouting material is prepared from the following raw materials in parts by weight: 270 parts of base material, 2 parts of composite alkaline activator, 1.5 parts of high-efficiency water reducing agent, 0.5 part of fiber and 40 parts of water.
9. A preparation method of a low-carbon impervious type full-solid waste grouting material is characterized by comprising the following steps:
weighing various raw materials according to the weight ratio;
uniformly mixing desulfurized gypsum, furnace slag, bentonite, fly ash, mineral powder and fine aggregate in proportion to prepare a matrix material;
uniformly mixing a base material, a composite additive and water in proportion to prepare a low-carbon anti-permeability type full-solid waste grouting material;
preferably, the fineness of the feedstock is greater than 425 mesh.
10. Use of the total solid waste grouting material according to claim 7 or 8 in impervious filling.
Priority Applications (1)
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