CN117510172A - Solid waste base curing agent for open cut engineering slag soil backfill and application thereof - Google Patents

Solid waste base curing agent for open cut engineering slag soil backfill and application thereof Download PDF

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Publication number
CN117510172A
CN117510172A CN202410013965.8A CN202410013965A CN117510172A CN 117510172 A CN117510172 A CN 117510172A CN 202410013965 A CN202410013965 A CN 202410013965A CN 117510172 A CN117510172 A CN 117510172A
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China
Prior art keywords
solid waste
curing agent
backfill
parts
soil
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CN202410013965.8A
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Chinese (zh)
Inventor
马涛
高伯川
贾沼霖
秦永刚
曹帅
邢润栋
王艳峰
马建国
王建
董智杰
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Hebei University of Engineering
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Hebei University of Engineering
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Priority to CN202410013965.8A priority Critical patent/CN117510172A/en
Publication of CN117510172A publication Critical patent/CN117510172A/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/146—Silica fume
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/0006—Waste inorganic materials
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • 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
    • C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
    • C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
    • 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
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • 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
    • 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

Abstract

The invention discloses a solid waste-based curing agent for open cut engineering slag soil backfill and application thereof, comprising common solid waste materials, solid carbon-solid waste materials and anti-seepage erosion materials; the common solid waste materials comprise desulfurized gypsum and silicon crystal powder; the carbon-fixing and waste-fixing material is waste water mud powder; the anti-penetration erosion material comprises epoxy resin and wheat straw fiber; the weight ratio of each component is as follows: 90-110 parts of desulfurized gypsum, 45-55 parts of silicon crystal powder, 45-55 parts of waste cement powder, 4-6 parts of epoxy resin and 4-6 parts of wheat straw fiber. The invention adopts a combination mode of a carbon dioxide sealing technology and a solid waste material and an anti-seepage technology, and takes common solid waste material, solid carbon and solid waste material and anti-seepage erosion material as synergistic components to match. Compared with the traditional curing agent, the curing agent has the advantages that a large amount of industrial solid waste is used as the main body of the curing agent, and the manufacturing cost is correspondingly reduced, so that the curing agent has feasibility in the aspects of technology, economy and convenience.

Description

Solid waste base curing agent for open cut engineering slag soil backfill and application thereof
Technical Field
The invention relates to a soil body improvement technology for open cut engineering slag soil backfill, in particular to a solid waste base curing agent for improving the soil property of open cut engineering slag soil and a preparation method thereof, and belongs to the technical field of solid waste building material improvement.
Background
The existing open cut engineering slag soil is mainly treated in a landfill treatment mode, and a layer of normal soil is covered on the uppermost part of a soil layer after the slag soil is directly backfilled, so that the backfilling in the mode is easy to cause insufficient bearing capacity of the slag soil and water and soil loss, and the safety problem of surrounding building foundations and the quality of life of human production are negatively influenced. Therefore, in recent years, the slag soil backfilling adopts an improved backfilling mode of adding a curing agent, and certain resource utilization is realized.
The existing common open cut engineering residue soil curing agent is generally cement, lime and the like, and is characterized by higher economic cost, larger environmental pollution caused by the discharge of a large amount of carbon dioxide in the manufacturing process, and insignificant resource utilization condition. The strength of the solidified slag soil of the open cut engineering is greatly influenced by the surrounding environment, is mainly influenced by carbon dioxide erosion and water seepage erosion, and the common curing agent has no pertinence to a series of special environments and has insufficient resistance.
Based on the characteristics and the function demand analysis, the method of combining the carbon dioxide sealing technology with the solid waste material and the seepage prevention technology can effectively make up for the phenomenon that the curing agent is insufficient in carbon dioxide erosion resistance and water seepage erosion resistance, enhance the recycling utilization rate and greatly reduce the economic cost of the open cut engineering slag soil curing backfill engineering. Meanwhile, a certain amount of carbon dioxide is sealed, which is helpful for reducing the influence of greenhouse effect.
The combination of the carbon dioxide sealing technology, the solid waste material and the seepage prevention technology is an economic and effective muck backfilling means, aims to complement carbonization erosion resistance and water stability, and fully verifies and analyzes carbon dioxide sealing and solid waste utilization so as to improve the resistance of muck backfilling to special environments and greatly utilize resources.
Disclosure of Invention
Based on the analysis of the background technology, the technical aim of the invention is to provide the solid waste-based curing agent applied to the open-cut engineering slag soil backfill and the application thereof, and mainly aims at solving the problems that in the open-cut engineering slag soil backfill, the open-cut slag soil curing backfill often uses a common curing agent, the manufacturing process of the common curing agent has large pollution to the environment, the recycling utilization rate is low, the economic cost is high, and the curing effect has no pertinence on the capability of resisting carbon dioxide erosion and water seepage erosion.
In order to achieve the above purpose, according to the first aspect, through a large number of experimental comparisons, the invention designs a solid waste-based curing agent applied to open cut engineering slag soil backfill: compared with the common curing agent used for curing and backfilling the open cut dregs, the solid waste-based curing agent prepared by the invention has the advantages that the carbon dioxide erosion resistance is obviously improved, and the solid waste-based curing agent has pertinency to the carbon dioxide erosion environment; in particular to the carbon dioxide sealing and preserving capability aiming at the growth of the compressive strength under the corrosion of carbon dioxide.
In the second aspect, the solid waste-based curing agent prepared by the invention has the advantages of remarkably improved water seepage and erosion resistance, good water stability, and pertinency and applicability to water environment compared with the common curing agent based on the seepage prevention technology.
In the third aspect, the raw materials of the curing agent are solid waste materials accounting for 95% of the mass, and compared with the conventional curing agent which is frequently used for curing and backfilling open cut dregs, the recycling utilization degree of solid waste is greatly improved.
In the fourth aspect, the waste cement and the silicon crystal powder introduced by the curing agent are used as curing materials, the micro aggregate filling effect and the activation characteristic are added on the basis of basic chemical reaction, and a better curing effect is achieved on the curing backfilling of the open cut dregs.
The technical scheme adopted by the invention is that the solid waste-based curing agent for backfilling the open cut engineering slag soil comprises common solid waste materials, carbon-fixing solid waste materials and anti-seepage erosion materials; the common solid waste materials comprise desulfurized gypsum and silicon crystal powder; the carbon-fixing and waste-fixing material is waste water mud powder; the anti-penetration erosion material comprises epoxy resin and wheat straw fiber; the weight ratio of each component is as follows: 90-110 parts of desulfurized gypsum, 45-55 parts of silicon crystal powder, 45-55 parts of waste cement powder, 4-6 parts of epoxy resin and 4-6 parts of wheat straw fiber.
Further, the silicon crystal powder source is an industrial byproduct generated during blast furnace ironmaking and is industrial solid waste; the silicon crystal powder is combined with the desulfurized gypsum to generate volcanic ash reaction, so that the gel mass material is generated to improve the backfill soil strength, and the micro aggregate filling effect exists. The particle size of the wastewater sludge powder and the silicon crystal powder is smaller than 0.15mm; the particle size of the desulfurized gypsum and wheat straw fiber powder is smaller than 0.2mm.
Further, the waste cement powder is ordinary Portland cement which is not capable of meeting sales requirements and engineering applications and has generated partial hydration due to long-term stacking or improper storage; the common silicate cement is crushed and screened by a 100-mesh screen to obtain waste cement powder. The active part of the waste cement powder is subjected to hydration reaction in the backfill soil curing process to generate a cementing material for cooperative hardening; the inactive part of the waste cement powder serves as coarse aggregate of backfill soil to provide early strength; the waste cement powder can generate carbonization reaction when contacting with carbon dioxide in air in hydration reaction, and generates calcium hydroxide and has activating capability again to carry out secondary hardening. The strength grade of the ordinary Portland cement is one or more of 32.5MPa,42.5MPa or 52.5 MPa.
Further, the initial setting time of the desulfurized gypsum is not less than 4min, the flexural strength of the desulfurized gypsum is not less than 4MPa for 2h, and the compressive strength of the desulfurized gypsum is not less than 8MPa for 2 h. The desulfurization gypsum is an industrial byproduct generated in flue gas desulfurization operation, and is coagulated in water to form a gel mass material.
Further, the epoxy resin and the wheat straw fiber are used as anti-seepage erosion materials of the curing agent; the epoxy resin powder is in a cementing shape when meeting water, and is doped into backfill soil to block pores among the particles of the backfill soil, so as to block water molecules from penetrating; the shear strength of backfill soil is improved by doping wheat straw fibers.
Further, the viscosity of the epoxy resin is 6-10 Pa.s at 25 ℃, and the epoxy equivalent is not less than 210g/eq. The wheat straw fiber burns for 60min at 650 ℃, and the ash content is not higher than 10.5%.
Further, the density of the silicon crystal powder is not lower than 2.4g/cm 3 The silica content is not less than 95% and the mohs hardness is not less than 6.8.
Further, the unconfined compressive strength of the 28d compressive strength of the solid waste-based curing agent is in the range of 1.21-5.93 MPa.
The invention also provides backfill soil for backfilling the open cut engineering slag soil containing the solid waste base curing agent, which comprises the following components in parts by mass: 72-76 parts of open cut engineering dregs, 14-15 parts of solid waste base curing agent and 10-14 parts of water.
The open cut engineering slag soil is dry soil.
The application flow is as follows: carrying out airing pretreatment on open cut engineering slag soil to obtain air-dried slag soil, wherein the water content of the air-dried slag soil is not more than 5%; uniformly mixing the solid waste base curing agent with air-dried slag soil, then adding mixing water which is prepared in advance and has no pollution, and uniformly mixing to obtain a solid waste modified slag soil backfill soil mixture; backfilling the solid waste modified slag soil backfill soil mixture into an open cut foundation pit, compacting by adopting an oscillation compaction method, wherein the compaction degree is not highBelow 2.05g/cm 3 And finally, curing the open cut foundation pit by adopting a concrete pavement curing process.
The mixing water is slightly alkaline water.
It should be noted that, there are three construction points for the solid waste improved dregs backfill: 1) The wastewater sludge is crushed and sieved to prevent the condition of uneven mixing; 2) The proportion of the solid waste-based curing agent can be designed and calculated according to different influences such as climate environment, engineering requirements, soil conditions and the like; 3) Backfilling the backfill into a foundation pit within half an hour after the completion of the mixing, and compacting the backfill by oscillating compaction to ensure that the compactness reaches 2.05-2.15g/cm 3 The curing process is similar to the existing concrete pavement curing process.
Compared with the prior art, the solid waste base curing agent disclosed by the invention can solve the cost loss generated by stacking and transporting open cut dregs, and the resource utilization rate is increased by improving backfilling. Provides a reasonable treatment way for industrial solid waste, and solves the problems of poor infiltration resistance and carbonization erosion resistance and low bearing capacity of common backfill. The solid waste-based curing agent can enable the final unconfined compressive strength of the backfill to reach more than 1.21MPa, and can reach 5.93MPa by adjusting the proportion, thereby greatly improving the unconfined compressive strength and the bearing capacity of the backfill.
2. The proportioning mode of the solid waste-based curing agent adopts a combination mode of a carbon dioxide sealing technology and a solid waste material and anti-seepage technology, and the three materials are used as synergistic components for collocation. Not only fills up the defect of curing agent for carbonization erosion resistance in the curing agent market, but also fills up the blank of reducing the influence of water flow scouring in the permeation resistant field; the bearing capacity strength of the modified polyurethane is not only not reduced but also enhanced with time in carbonization environment, and the modified polyurethane is a novel curing agent with a growing property.
3. The solid waste-based curing agent disclosed by the invention combines a carbon dioxide sealing technology, an anti-seepage technology and solid waste materials, and is a high-cost performance technical means for improving the backfill slag soil strength and the severe environment resistance of open cut engineering. Compared with the traditional curing agent, the curing agent has the advantages that a large amount of industrial solid waste is used as the main body of the curing agent, and the manufacturing cost is correspondingly reduced, so that the curing agent has feasibility in the aspects of technology, economy and convenience.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings: FIG. 1 is a schematic of block carbonization erosion.
Fig. 2 is a schematic illustration of osmotic erosion.
In the figure: 1. the device comprises an exhaust port, a pressure gauge, 3, carbon dioxide, 4, an air inlet, 5, a test block, 6 and seawater.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. It should be well known to those skilled in the art that the present invention can be better understood in light of the following examples. However, the specific material ratios, process conditions and results thereof described in the examples are only for illustration of the present invention and should not be construed as limiting the invention as detailed in the claims.
The invention provides a solid waste base curing agent applied to open cut engineering slag soil backfill, and designs and verifies the application mode and the application effect of the solid waste base curing agent. The solid waste-based curing agent comprises common solid waste materials, solid carbon-solid waste materials and anti-penetration erosion materials; the common solid waste materials comprise desulfurized gypsum and silicon crystal powder; the carbon-fixing and waste-fixing material is waste water mud powder; the anti-penetration erosion material comprises epoxy resin and wheat straw fiber; the weight ratio of each component is as follows: 90-110 parts of desulfurized gypsum, 45-55 parts of silicon crystal powder, 45-55 parts of waste cement powder, 4-6 parts of epoxy resin and 4-6 parts of wheat straw fiber.
The desulfurization gypsum is an industrial byproduct generated in flue gas desulfurization operation, and is characterized in that when the desulfurization gypsum is used as a curing material, a coagulation reaction is generated when water meets, the cohesive force of backfill soil is enhanced, a gel group is formed, the strength of the backfill soil is enhanced, and the desulfurization gypsum is industrial solid waste, so that the cost is low and the resource utilization degree is high. The silicon crystal powder is produced as an industrial byproduct during blast furnace ironmaking and is industrial solid waste, and is characterized in that when the silicon crystal powder is used as a curing material to be combined with desulfurized gypsum, volcanic ash reaction occurs, a cementing material is further produced to improve the backfill soil strength, and a micro aggregate filling effect exists, so that the porosity of the backfill soil is effectively reduced, the density is increased, and the impervious capacity is improved.
The waste cement powder is carbon-fixing and solid-waste material of solid waste-based curing agent, and the waste cement powder is silicate cement waste powder which is partially hydrated and cannot meet the requirements of sales and engineering application, and waste cement is crushed and passes through a 100-mesh screen to obtain the waste cement powder required by the invention. The characteristic is that it possesses triple characteristics: 1) The waste cement powder still has an active part, and the active part of the waste cement powder has hydration reaction in the slag soil curing process to generate cementing material for cooperative hardening; 2) Physical strength: the inactive part of the waste cement powder can serve as coarse aggregate to provide early strength; 3) Resistance to carbonization erosion: when contacting with carbon dioxide in the air, carbonization reaction can occur to generate calcium hydroxide, and the calcium hydroxide has activating capability again, and cooperates with other materials of the solid waste base curing agent to carry out secondary hardening. So that the carbon dioxide erosion resistance is improved in a targeted manner.
The epoxy resin and the wheat straw fiber form an anti-seepage erosion material of the solid waste base curing agent; the epoxy resin powder is in a cementing shape when meeting water, and is doped into backfill soil, so that pores among soil particles can be blocked, permeation of water molecules is blocked, the shear strength of the backfill soil can be improved through the lifting effect among fibers due to the increase of wheat straw fibers, and the epoxy resin powder and the wheat straw fibers are synergistic.
The solid waste base curing agent is characterized in that: 1) The carbonization erosion resistance is improved pertinently, and the carbon dioxide sealing and storing capability is provided; 2) The water-based paint has strong permeability resistance, good water stability and a certain protection effect on water flow scouring; 3) The main materials of the solid waste-based curing agent are solid waste, so that the utilization degree of resources is increased; 4) The bearing capacity is obviously improved, and the occurrence of foundation settlement is reduced.
The solid waste-based curing agent provided by the invention has good curing effect on backfill with different soil properties and different proportions, improves the bearing capacity, and floats (28 d compressive strength) within the range of 1.21-5.93 MPa.
The waste cement used in the examples is 42.5-grade Portland cement with long stacking time, which causes cement denaturation, hydration and caking, and the waste cement powder as a raw material is obtained after crushing and sieving.
The desulfurization gypsum and the silicon crystal powder are by-products of the power plant; the particle sizes of the waste cement powder and the silicon crystal powder are smaller than 0.15mm, and the particle sizes of the desulfurized gypsum and the wheat straw fiber powder are smaller than 0.2mm.
The dregs used in the examples are all dry dregs baked by an oven, and the water content is not higher than 1%; in the embodiment, the initial setting time of the desulfurized gypsum is 4min, the flexural strength of the desulfurized gypsum is 4MPa for 2 hours, and the compressive strength of the desulfurized gypsum is 8.5MPa for 2 hours.
In the examples, epoxy resins were used, the viscosity at 25℃was 8 Pa.s, and the epoxy equivalent weights were 240g/eq; in the examples, silicon crystal powders were used, each having a density of 2.44g/cm 3 The silica content was 96.7% and the mohs hardness was 7.
In the embodiment, wheat straw fibers are burnt for 60min at 650 ℃, and ash contents are 10%; in the examples, the water used is pollution-free weakly alkaline water, and ph=8±0.2.
Example 1-load-bearing lifting test;
1. the solid waste base curing agent comprises the following components in parts by mass:
1) Common solid waste materials: 110 parts of desulfurized gypsum; carbon fixation and waste fixation material: 45 parts of waste cement powder; penetration erosion resistant material: 45 parts of silicon crystal powder, 5 parts of epoxy resin and 5 parts of wheat straw fiber.
TABLE 1-1 solid waste based curing agent composition
2) Common solid waste materials: 100 parts of desulfurized gypsum; carbon fixation and waste fixation material: 50 parts of waste cement powder; penetration erosion resistant material: 50 parts of silicon crystal powder, 5 parts of epoxy resin and 5 parts of wheat straw fiber.
TABLE 1-2 solid waste based curing agent composition
3) Common solid waste materials: 90 parts of desulfurized gypsum; carbon fixation and waste fixation material: 55 parts of waste cement powder; penetration erosion resistant material: 55 parts of silicon crystal powder, 5 parts of epoxy resin and 5 parts of wheat straw fiber.
TABLE 1-3 solid waste based curing agent composition
2. When the dregs are backfilled and solidified, the backfill soil comprises the following components in parts by mass:
1) 149 parts of dregs, 30 parts of solid waste base curing agent and 21 parts of water;
2) 147 parts of dregs, 29 parts of solid waste base curing agent and 24 parts of water;
3) 145 parts of dregs, 29 parts of solid waste base curing agent and 26 parts of water;
tables 1 to 4 composition of mixture materials
3. An application method;
3.1 preparation for construction: firstly, the water content of open cut dregs is measured, the proportion of a curing agent is selected according to the design of a pre-test of the bearing capacity required by engineering, the water quantity required to be added or the time required to be pretreated by airing the dregs is analyzed and calculated, and a foundation pit is leveled for curing and backfilling.
3.2, construction method: and analyzing and calculating the material consumption according to the pre-test result and the space size of the foundation pit, taking compactness into consideration, putting all materials including the dregs and water into a stirrer to stir for about 5 minutes, and backfilling the stirred backfill into the open-cut foundation pit. And then compacting the backfill soil by adopting a road roller, paving a layer of polyethylene film on the uppermost layer of the compacted soil surface, and sealing and curing, wherein the compacting time of each mixing is controlled within 30 minutes.
3.3 quality detection: taking 180-210g of uniform backfill mixed by a stirrer, putting the uniform backfill into a test mold with the diameter of 50mm and the height of 150mm, compacting by adopting a jack-simulated road roller, compacting the backfill into 50mm cylindrical test blocks, removing the film, sealing the formed test blocks with preservative films, putting the test blocks into a standard curing box with the temperature of 22+/-0.5 ℃ and the relative humidity of more than 95%, measuring the unconfined compressive strength value of the test blocks corresponding to the curing time, preparing at least 5 test blocks corresponding to each curing time according to the same steps, and taking the average value as the strength value.
4. Measurement results: unconfined compressive strength;
tables 1-5 results of different curing times corresponding to unconfined compressive Strength
The unconfined compressive strength of the case test can reach 5.93MPa when the maximum strength reaches 3.4MPa at 3d and reaches 5.93MPa when the maximum strength reaches 28d, the bearing capacity is obviously improved, and the unconfined compressive strength can be regulated according to specific conditions.
Example 2-test for resistance to carbonization erosion;
1. the solid waste base curing agent comprises the following components in parts by mass:
common solid waste materials: 100 parts of desulfurized gypsum; carbon fixation and waste fixation material: 50 parts of waste cement; penetration erosion resistant material: 50 parts of silicon crystal powder, 5 parts of epoxy resin and 5 parts of wheat straw fiber.
2. When the slag soil is backfilled and solidified, the backfill soil comprises the following components in parts by mass:
149 parts of dregs, 30 parts of solid waste base curing agent and 21 parts of water. As in example 1-1).
3. An application method;
3.1 as in embodiment 1;
3.2 as in embodiment 1;
3.3 quality detection;
in addition to the molding curing described in embodiment 1, the cured test block 5 was subjected to carbonization treatment, and the test block was subjected to pressurized carbonization by using a carbonization pressure device; the top of the carbonization pressure device is provided with an exhaust port 1 and a pressure gauge 2; the bottom of the carbonization pressure device is provided with an air inlet 4; when the pressure gauge 2 shows 100kpa pressure, carbon dioxide 3 is continuously introduced through the air inlet 4 to accelerate the carbonization reaction of the test block 5, and the schematic diagram is shown in fig. 1, and unconfined compressive strength values of the test pieces after 1h, 3h and 6h carbonization are measured respectively.
4. Measurement results: unconfined compressive strength;
TABLE 2-1 unconfined compressive Strength results under carbonization erosion
The case test has the advantages that the unconfined compressive strength of 3d reaches 3.33MPa, the unconfined compressive strength of 7d reaches 3.78MPa, the strength is reduced due to the erosion effect on backfill soil in the early carbonization stage, the waste cement is enabled to have activity again for secondary hardening and reinforcement under the carbonization environment along with the time, the strength is improved, and the strength of the 6h carbonized soil is only 7% lower than that of the non-carbonized soil in the 7d stage, so that the backfill slag soil adopting the solid waste-based curing agent has good carbonization erosion resistance.
Example 3-penetration erosion resistance test;
1. the solid waste base curing agent comprises the following components in parts by mass:
common solid waste materials: 90 parts of desulfurized gypsum; carbon fixation and waste fixation material: 55 parts of waste cement powder; penetration erosion resistant material: 55 parts of silicon crystal powder, 5 parts of epoxy resin and 5 parts of wheat straw fiber.
2. When the slag soil is backfilled and solidified, the backfill soil comprises the following components in parts by mass:
148 parts of dregs, 28 parts of solid waste base curing agent and 24 parts of water;
TABLE 3-1 composition of mixture materials
3. An application method;
3.1 as in embodiment 1;
3.2 as in embodiment 1;
3.3 quality detection;
in addition to the molding curing described in example 1, the cured test piece 5 was subjected to a soaking treatment in which sea brine 6 having a sea salt concentration of 3.5% was used as water at 25℃and the unconfined compressive strength value of the soaked test piece was measured. As shown in fig. 2.
4. Measurement results:
TABLE 3-2 unconfined compressive Strength results under osmotic erosion
The case test compares the unconfined compressive strength of the molded test block after curing for 1d with that of the molded test block after direct soaking for 1d, the water stability of the test block is calculated to be 0.881, the strong soaking test is carried out on the cured test block for 3d, and the residual strength of the test block after soaking for 28d is still 0.31MPa.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The solid waste-based curing agent for open cut engineering slag soil backfill is characterized by comprising common solid waste materials, solid carbon solid waste materials and anti-seepage erosion materials; the common solid waste materials comprise desulfurized gypsum and silicon crystal powder; the carbon-fixing and waste-fixing material is waste water mud powder; the anti-penetration erosion material comprises epoxy resin and wheat straw fiber; the weight ratio of each component is as follows: 90-110 parts of desulfurized gypsum, 45-55 parts of silicon crystal powder, 45-55 parts of waste cement powder, 4-6 parts of epoxy resin and 4-6 parts of wheat straw fiber.
2. The solid waste-based curing agent for open cut engineering slag soil backfill according to claim 1, wherein the silicon crystal powder source is an industrial byproduct generated during blast furnace ironmaking and is industrial solid waste; the silicon crystal powder is combined with the desulfurized gypsum to generate volcanic ash reaction, so that gel mass materials are generated to improve the backfill soil strength, and the micro aggregate filling effect exists; the particle size of the wastewater sludge powder and the silicon crystal powder is smaller than 0.15mm; the particle size of the desulfurized gypsum and wheat straw fiber powder is smaller than 0.2mm.
3. The solid waste-based curing agent for open cut engineering clinker backfill according to claim 1, wherein the waste cement powder is Portland cement which has been partially hydrated; crushing ordinary Portland cement, and sieving with a 100-mesh sieve to obtain waste cement powder; the active part of the waste cement powder is subjected to hydration reaction in the backfill soil curing process to generate a cementing material for cooperative hardening; the inactive part of the waste cement powder serves as coarse aggregate of backfill soil; the waste cement powder can generate carbonization reaction when contacting with carbon dioxide in the air in hydration reaction, and generates calcium hydroxide and has activation capability again to carry out secondary hardening; the strength grade of the ordinary Portland cement is one or more of 32.5MPa,42.5MPa or 52.5 MPa.
4. The solid waste-based curing agent for open cut engineering slag soil backfill according to claim 1, wherein the initial setting time of the desulfurized gypsum is not less than 4min, the flexural strength for 2h is not less than 4MPa and the compressive strength for 2h is not less than 8MPa; the desulfurization gypsum is an industrial byproduct generated in flue gas desulfurization operation, and is coagulated in water to form a gel mass material.
5. The solid waste-based curing agent for open cut engineering slag soil backfill according to claim 1, wherein epoxy resin and wheat straw fiber are anti-penetration erosion materials of the curing agent; the epoxy resin powder is in a cementing shape when meeting water, and is doped into backfill soil to seal the pores among the particles of the backfill soil; the shear strength of backfill soil is improved by doping wheat straw fibers.
6. The solid waste-based curing agent for open cut engineering slag soil backfill according to claim 1, wherein the viscosity of the epoxy resin is 6-10 Pa-s at 25 ℃, and the epoxy equivalent is not lower than 210g/eq; the wheat straw fiber burns for 60min at 650 ℃, and the ash content is not higher than 10.5%.
7. The solid waste-based curing agent for open cut engineering clinker backfill according to claim 1, wherein the density of the silicon crystal powder is not lower than 2.4g/cm 3 The silica content is not less than 95% and the mohs hardness is not less than 6.8.
8. The solid waste-based curing agent for open cut engineering clinker backfill according to claim 1, wherein the unconfined compressive strength of the solid waste-based curing agent is in the range of 1.21-5.93MPa in 28d compressive strength.
9. Backfill of open cut engineering residue soil backfill comprising the solid waste-based curing agent of any one of claims 1-8, characterized in that the composition of the backfill of open cut engineering residue soil backfill is as follows in mass ratio based on 100 parts: 72-76 parts of open cut engineering dregs, 14-15 parts of solid waste base curing agent and 10-13 parts of water.
10. The use of backfill according to claim 9, wherein the open cut engineering residue is dry soil, and the open cut engineering residue is subjected to air-drying pretreatment to obtain air-dried residue, and the moisture content of the air-dried residue is not more than 5%; uniformly mixing the solid waste base curing agent with air-dried slag soil, then adding mixing water which is prepared in advance and has no pollution, and uniformly mixing to obtain a solid waste modified slag soil backfill soil mixture; backfilling the solid waste modified slag soil backfill soil mixture into the open cut foundation pit, compacting by adopting an oscillation compaction method, and curing the open cut foundation pit by adopting a concrete pavement curing process.
CN202410013965.8A 2024-01-05 2024-01-05 Solid waste base curing agent for open cut engineering slag soil backfill and application thereof Pending CN117510172A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1424275A (en) * 2003-01-10 2003-06-18 中国矿业大学（北京校区） Cementing materials for filling, slurry and preparing and filling processes
CN106746785A (en) * 2017-02-03 2017-05-31 北京华德创业环保设备有限公司 A kind of lower shrinkage early-strength filling in mine Binder Materials
CN109796153A (en) * 2019-04-02 2019-05-24 山东建筑大学 A kind of aged cement hydration activity exciting agent
CN111960754A (en) * 2020-07-09 2020-11-20 山东省邱集煤矿有限公司 Solid waste base grouting material for mine water disaster control roof filling effect and preparation method thereof
CN112358270A (en) * 2020-10-28 2021-02-12 山东大学 Solid waste base coastal karst green filling material, and preparation method and application thereof
CN113816663A (en) * 2021-09-30 2021-12-21 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 Fiber-containing composite filler material and concrete member
CN114716205A (en) * 2022-03-30 2022-07-08 中建三局四川建筑装备有限公司 Production process, application and equipment for producing flow-state self-compacting backfill solidified soil by using solidified material
CN115073117A (en) * 2022-06-28 2022-09-20 河北筑盛科技股份有限公司 Mining low-temperature ultrahigh-crystallization-water rapid-solidification filling support material and preparation method thereof
CN116023104A (en) * 2022-08-25 2023-04-28 江苏同萃和科技有限公司 High-strength mineralized aerated building block prepared from solid wastes and preparation method thereof

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1424275A (en) * 2003-01-10 2003-06-18 中国矿业大学（北京校区） Cementing materials for filling, slurry and preparing and filling processes
CN106746785A (en) * 2017-02-03 2017-05-31 北京华德创业环保设备有限公司 A kind of lower shrinkage early-strength filling in mine Binder Materials
CN109796153A (en) * 2019-04-02 2019-05-24 山东建筑大学 A kind of aged cement hydration activity exciting agent
CN111960754A (en) * 2020-07-09 2020-11-20 山东省邱集煤矿有限公司 Solid waste base grouting material for mine water disaster control roof filling effect and preparation method thereof
CN112358270A (en) * 2020-10-28 2021-02-12 山东大学 Solid waste base coastal karst green filling material, and preparation method and application thereof
CN113816663A (en) * 2021-09-30 2021-12-21 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 Fiber-containing composite filler material and concrete member
CN114716205A (en) * 2022-03-30 2022-07-08 中建三局四川建筑装备有限公司 Production process, application and equipment for producing flow-state self-compacting backfill solidified soil by using solidified material
CN115073117A (en) * 2022-06-28 2022-09-20 河北筑盛科技股份有限公司 Mining low-temperature ultrahigh-crystallization-water rapid-solidification filling support material and preparation method thereof
CN116023104A (en) * 2022-08-25 2023-04-28 江苏同萃和科技有限公司 High-strength mineralized aerated building block prepared from solid wastes and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刘明帝 等: "脱硫石膏-废水泥碳化再生砌块的力学性能及机理", 《硅酸盐通报》, vol. 42, no. 11, 30 November 2023 (2023-11-30), pages 4035 - 4041 *

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