CN113307591B - Multi-source solid waste composite high-flow-state backfill material and preparation method and application thereof - Google Patents

Multi-source solid waste composite high-flow-state backfill material and preparation method and application thereof Download PDF

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CN113307591B
CN113307591B CN202110573148.4A CN202110573148A CN113307591B CN 113307591 B CN113307591 B CN 113307591B CN 202110573148 A CN202110573148 A CN 202110573148A CN 113307591 B CN113307591 B CN 113307591B
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water
weight
backfill material
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CN113307591A (en
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蹇守卫
成诚
吕阳
贺凌熹
任慧军
马保国
李相国
谭洪波
黄健
魏博
雷宇婷
王威振
李宝栋
高欣
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Wuhan University of Technology WUT
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions 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
    • C04B28/142Compositions 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
    • C04B28/143Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/18Making embankments, e.g. dikes, dams
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/2015Sulfate resistance
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a multi-source solid waste composite high-flow-state backfill material and a preparation method and application thereof. The backfill material comprises 950-1050 parts of muck, 40-60 parts of cement, 10-20 parts of superfine slag powder, 10-20 parts of fly ash, 20-30 parts of phosphogypsum, 7-15 parts of efficient curing agent and 275-525 parts of water; the efficient curing agent comprises 50-70 parts of sulfonated formaldehyde-acetone polycondensate, 20-30 parts of water glass, 10-20 parts of sodium dodecyl sulfate, 10-20 parts of water-soluble epoxy resin, 0-10 parts of sulfonated oil, 0-10 parts of sodium sulfate and 0-10 parts of polyacrylamide, wherein the water glass, the water-soluble epoxy resin and the polyacrylamide are calculated according to effective components. The backfill material is self-compacting, high in strength and good in durability, has low requirements on muck and construction environment, is suitable for construction of foundations and foundation trenches, is high in muck utilization rate, low in cost, environment-friendly and wide in application prospect.

Description

Multi-source solid waste composite high-flow-state backfill material and preparation method and application thereof
Technical Field
The invention relates to the field of civil engineering materials, in particular to a multi-source solid waste composite high-flow-state backfill material and a preparation method and application thereof.
Background
At present, in the construction process of China, a soil backfill mode is mostly adopted for foundation and foundation trench treatment. The traditional backfilling mode has the problems of high cost, non-compact backfilling and the like caused by more manpower and non-uniform mixing, the utilization rate of waste soil is low, and partial special-shaped face foundation trenches are difficult to construct. Although soil solidification by cement, curing agent and the like in subsequent construction is relatively improved, the backfilling also has the problems of high labor and material cost, low soil strength, poor impermeability and the like. On the other hand, with the development of urban construction and the progress of urbanization, a large amount of construction spoil is generated. The construction waste soil is transported to suburbs or villages by construction units without being treated and is piled or buried in the open air as waste, so that a large amount of land resources and soil resources are wasted, and secondary pollution is easily caused to surrounding land. The flow state backfill technology well solves the problems, not only can be constructed in a narrow construction environment to obtain a high-performance backfill material, but also can take dregs nearby, so that the dregs can be filled along with excavation, the cost is reduced, and meanwhile, the waste dregs are utilized to the maximum extent.
At present, the flow state backfill technology has been reported at home and abroad. For example: the patent (CN201711028883.7) discloses a flow state backfill material prepared by mixing construction waste recycled aggregate, cement, a sprayed concrete setting accelerator and shrinkage reducer, an admixture and water, and is applied to the rapid backfill of a road pipe trench, wherein the backfill material prepared by the technology is rapid in setting (the strength can reach 0.2-1.0 MPa for 2 hours) and high in strength (the strength can reach 1.0-6.0 MPa for 28 days). However, the total consumption of the cement and the admixture is high, the cost is difficult to control, the requirement on the granularity of the recycled aggregate of the construction waste is strict, and the operation is complex in the actual construction process. The patent (CN201910371791.1) discloses a fluidized solidified soil prepared by mixing granite slag soil, cement, fly ash, an additive (one or more of a water reducing agent, an early strength agent and a retarder) and water. However, the total dosage of the cement and the fly ash used in the technology is high, the cost is difficult to control, and the water reducing agent, the early strength agent and the retarder are not explained in the technology, so that technicians are difficult to select proper additives for construction and application. The patent (CN201910534068.0) discloses a fluidized mine pit backfill soil prepared by mixing contaminated soil, curing agent, active carbon powder, water reducing agent, quicklime, bentonite, shrinkage reducing agent, retarder, nano silicon dioxide, nano titanium dioxide, nano zinc oxide, nano bentonite, perovskite, ammonium chloride and water. However, the water reducing agent, the shrinkage reducing agent and the retarder are not described in the technology, so that the technical personnel can hardly select proper additives for construction application, and the backfill material obtained by the technology has low strength, and the unconfined compressive strength is less than or equal to 825kPa in the example.
Disclosure of Invention
The invention aims to solve the problems of high cost, non-compact backfill, low waste soil utilization rate, difficult construction of part of special-shaped structural surface foundation trenches and the like caused by the fact that a traditional backfill mode needs more manpower, and uneven mixing, and provides a multi-source solid waste composite high-flow-state backfill material, a preparation method and application thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the multi-source solid waste composite high-flow state backfill material comprises the following components in parts by weight: 950-1050 parts of muck, 40-60 parts of cement, 10-20 parts of superfine slag powder, 10-20 parts of fly ash, 20-30 parts of phosphogypsum, 7-15 parts of efficient curing agent and 275-525 parts of water; the efficient curing agent comprises, by weight, 50-70 parts of sulfonated formaldehyde-acetone polycondensate, 20-30 parts of water glass, 10-20 parts of sodium dodecyl sulfate, 10-20 parts of water-soluble epoxy resin, 0-10 parts of sulfonated oil, 0-10 parts of sodium sulfate and 0-10 parts of polyacrylamide, wherein the water glass, the water-soluble epoxy resin and the polyacrylamide are calculated according to the weight parts of active ingredients.
According to the scheme, the efficient curing agent comprises 50-70 parts by weight of sulfonated formaldehyde-acetone polycondensate, 20-25 parts by weight of water glass, 10-20 parts by weight of sodium dodecyl sulfate, 10-15 parts by weight of water-soluble epoxy resin, 5-10 parts by weight of sulfonated oil, 5-10 parts by weight of sodium sulfate and 5-10 parts by weight of polyacrylamide, wherein the water glass, the water-soluble epoxy resin and the polyacrylamide are calculated according to the weight parts of effective components.
According to the scheme, the maximum particle size of the residue soil is less than or equal to 20cm, and the content of organic matters in the residue soil is less than or equal to 5.0 wt%.
According to the scheme, the cement is one or more of ordinary Portland cement or sulphoaluminate cement with the concentration of P.O being more than or equal to 42.5.
According to the scheme, the stacking density of the superfine slag powder is more than or equal to 1.3g/cm3The specific surface area is more than or equal to 450m2/kg。
According to the scheme, the fly ash adopts secondary fly ash, the fineness (the screen residue of a 45-micron square-hole screen) is less than or equal to 25 percent, the water demand ratio is less than or equal to 105 percent, and the ignition loss is less than or equal to 8.0 percent.
According to the scheme, the phosphogypsum is solid waste generated in a wet-process phosphoric acid process, the fineness is not more than 200 meshes, the water content is less than 1%, and the content of heavy metal ions and radioactive substances is not more than 0.1%.
According to the scheme, the molecular weight of the sulfonated formaldehyde-acetone polycondensate (SAF) is 4000-6000, and the water reducing efficiency is 20-25%.
According to the scheme, the water glass is a slightly bluish-green semitransparent liquid, the modulus is 2.4-3.2, and the content of sodium silicate is less than or equal to 50%.
According to the scheme, the water-soluble epoxy resin is a milky white liquid, and the density of the milky white liquid is 1.00-1.10 g/cm3The content of effective components is 45-55%.
According to the scheme, the sulfonated oil is a reddish brown transparent oily substance, the pH value is 5-7, and the stabilization time in water is more than or equal to 12 hours.
According to the scheme, the polyacrylamide is white powdery solid, the content of the effective component is more than or equal to 90 percent, and the density is 1.25-1.35 g/cm3
The invention provides a preparation method of the multi-source solid waste composite high-flow-state backfill material, which comprises the following steps:
dissolving the components of the high-efficiency curing agent in water to obtain a high-efficiency curing agent solution for later use, pouring the residue soil, the cement, the superfine slag powder, the fly ash and the phosphogypsum into a stirrer to be uniformly mixed, then adding the prepared high-efficiency curing agent solution, and stirring for 3-5 min; and obtaining the multi-source solid waste composite high-flow backfill material.
The application of the multi-source solid waste composite high-flow state backfill material in construction environments such as foundations or foundation trenches is provided. Preferably, the base groove is a profiled base groove.
The principle of the invention is as follows:
the invention provides a multi-source solid waste composite high-flow backfill material, which is prepared by taking muck as a main material, replacing part of cement with appropriate amount of superfine slag powder, fly ash, phosphogypsum and other solid wastes with certain hydration activity, and then preparing a small amount of efficient curing agent. Wherein, the slag soil, the superfine slag powder, the fly ash, the phosphogypsum and the like are subjected to polymer disintegration under the excitation action of alkaline substances in the high-efficiency curing agent, and are recombined to form C-S-H gel and C-A-S-H gel, so that the cured soil is more stable, and the strength is improved; in addition, the superfine slag powder can generate a proper amount of ettringite at the later stage, so that better later strength and shrinkage reduction are achieved; the fly ash can improve the durability of a backfill material, and a lubricating layer is formed in the mixing process, so that the water consumption for mixing is reduced; the addition of the phosphogypsum can accelerate the setting speed and reduce the setting time. The sulfonated formaldehyde-acetone polycondensate solves the problem that the polycarboxylate superplasticizer fails when meeting the soil, and achieves the effect of efficiently reducing water. The organic components of the sodium dodecyl sulfate, the polyacrylamide and the water-soluble epoxy resin in the high-efficiency curing agent are good in compounding compatibility, so that the interface bonding can be enhanced, the strength is further improved, and the requirements on the content of organic matters and sand in the residue soil are reduced; in addition, the sodium dodecyl sulfate can reduce volume shrinkage and avoid cracking; the polyacrylamide can adsorb soil, so that the strength is enhanced; the water seepage resistance of the backfill material can be enhanced by matching with the sulfonated oil.
Compared with the prior art, the invention has the beneficial effects that:
1) the multi-source solid waste composite high-flow backfill material provided by the invention fully utilizes the interaction of muck, inorganic cementing materials (cement, slag, fly ash and phosphogypsum) and a special curing agent to prepare the high-flow backfill material, is suitable for the construction of sites such as foundations, foundation trenches and the like, has higher strength and better durability for the solidified soil body, has high construction speed and less required manpower, and plays a positive and important role in construction progress, resource environment and social benefit.
2) The invention uses the solid wastes with certain hydration activity, such as superfine slag powder, fly ash, phosphogypsum, and the like to replace part of cement, thereby saving the cost; the organic components in the efficient curing agent can enhance the interface bonding and further improve the strength, have low requirements on soil components and moisture, can take and use the muck nearby, can be filled along with digging, and saves the transportation cost and the absorption cost; the backfill material constructed by the technology can be self-compact, has low requirements on the construction surrounding environment, and can be constructed in the irregular structural surface foundation trench which is not beneficial to compaction.
3) The backfill material obtained by the technology has good construction performance, strength and durability, is easy to maintain, can utilize waste residue soil to a great extent, and is suitable for actual production and rapid popularization.
Detailed Description
The invention of the present application is further illustrated below with reference to examples, which should not be construed as limiting the claims. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
The backfill material in the following embodiment is obtained by the following preparation method, and comprises the following specific steps:
dissolving the components of the high-efficiency curing agent in water to obtain a high-efficiency curing agent solution for later use, pouring the residue soil, the cement, the superfine slag powder, the fly ash and the phosphogypsum into a stirrer to be uniformly mixed, then adding the prepared high-efficiency curing agent solution, and stirring for 3-5 min; and obtaining the multi-source solid waste composite high-flow backfill material.
Example 1
The multi-source solid waste composite high-flow backfill material comprises, by weight, 1000 parts of muck, 55 parts of cement, 15 parts of superfine slag powder, 15 parts of fly ash, 20 parts of phosphogypsum, 12 parts of an efficient curing agent and 300 parts of water. The high-efficiency curing agent comprises 60 parts by weight of sulfonated formaldehyde-acetone polycondensate, 24 parts by weight of water glass, 12 parts by weight of sodium dodecyl sulfate and 15 parts by weight of water-soluble epoxy resin; the water glass and the water-soluble epoxy resin are calculated according to the weight parts of the effective components.
The technical indexes of the raw materials used in the embodiment are as follows:
the maximum particle size of the slag soil is 15.8cm, and the content of organic matters in the slag soil is 3.24 wt%.
The cement is PO42.5 ordinary portland cement.
The stacking density of the superfine slag powder is 1.31g/cm3Specific surface area of 461m2/kg。
The fineness of the fly ash (the balance of a 45-micron square-hole sieve) is 22.5 percent, the water demand ratio is 103 percent, and the loss on ignition is 5.27 percent.
The fineness of the phosphogypsum is not more than 200 meshes, the water content is 0.91 percent, and the content of heavy metal ions and radioactive substances is not more than 0.1 percent.
The molecular weight of the sulfonated formaldehyde-acetone polycondensate (SAF) is 4000-6000, and the water reducing efficiency is 23%.
The water glass modulus is 2.5, and the sodium silicate content is 48 percent.
The density of the water-soluble epoxy resin is 1.02g/cm3The content of effective components is 51 percent.
Example 2
The multi-source solid waste composite high-flow backfill material comprises, by weight, 1020 parts of muck, 55 parts of cement, 15 parts of superfine slag powder, 20 parts of fly ash, 20 parts of phosphogypsum, 11 parts of an efficient curing agent and 350 parts of water. The high-efficiency curing agent comprises 50 parts by weight of sulfonated formaldehyde-acetone polycondensate, 20 parts by weight of water glass, 12 parts by weight of sodium dodecyl sulfate, 15 parts by weight of water-soluble epoxy resin, 5 parts by weight of sulfonated oil and 5 parts by weight of sodium sulfate; the water glass and the water-soluble epoxy resin are calculated according to the weight parts of the effective components.
The technical indexes of the raw materials used in the embodiment are as follows:
the maximum particle size of the slag soil is 19.8cm, and the content of organic matters in the slag soil is 2.34 wt%.
The cement is PO42.5 ordinary portland cement.
The density of the superfine slag powder is 2.76g/cm3Specific surface area of 512m2/kg。
The fineness of the fly ash (the screen residue of a 45-micron square-hole screen) is 24.3 percent, the water demand ratio is 101 percent, and the loss on ignition is 4.10 percent.
The fineness of the phosphogypsum is not more than 200 meshes, the water content is 0.95 percent, and the content of heavy metal ions and radioactive substances is not more than 0.1 percent.
The molecular weight of the sulfonated formaldehyde-acetone polycondensate (SAF) is 4000-6000, and the water reducing efficiency is 22%.
The water glass modulus is 2.7, and the sodium silicate content is 44%.
The density of the water-soluble epoxy resin is 1.04g/cm3The content of effective components is 48 percent.
The sulfonated oil has a pH of 6.5.
Example 3
The multi-source solid waste composite high-flow backfill material comprises 950 parts by weight of muck, 40 parts by weight of cement, 20 parts by weight of superfine slag powder, 20 parts by weight of fly ash, 20 parts by weight of phosphogypsum, 15 parts by weight of efficient curing agent and 275 parts by weight of water. The high-efficiency curing agent comprises 50 parts by weight of sulfonated formaldehyde-acetone polycondensate, 24 parts by weight of water glass, 12 parts by weight of sodium dodecyl sulfate, 15 parts by weight of water-soluble epoxy resin and 5 parts by weight of sulfonated oil; the water glass and the water-soluble epoxy resin are calculated according to the weight parts of the effective components.
The technical indexes of the raw materials used in the embodiment are as follows:
the maximum particle size of the slag soil is 13.8cm, and the content of organic matters in the slag soil is 3.26 wt%.
The cement is PO52.5 ordinary portland cement.
The density of the superfine slag powder is 2.11g/cm3Specific surface area 476m2/kg。
The fineness of the fly ash (the balance of a 45-micron square-hole sieve) is 24.3 percent, the water demand ratio is 103 percent, and the loss on ignition is 3.13 percent.
The fineness of the phosphogypsum is not more than 200 meshes, the water content is 0.11 percent, and the content of heavy metal ions and radioactive substances is not more than 0.1 percent.
The molecular weight of the sulfonated formaldehyde-acetone polycondensate (SAF) is 4000-6000, and the water reducing efficiency is 24%.
The water glass modulus is 2.7, and the sodium silicate content is 47 percent.
The density of the water-soluble epoxy resin is 1.04g/cm3The content of effective components is 50%.
The sulfonated oil has a pH of 5.9.
Example 4
The multi-source solid waste composite high-flow backfill material comprises 1050 parts by weight of muck, 60 parts by weight of cement, 10 parts by weight of superfine slag powder, 10 parts by weight of fly ash, 20 parts by weight of phosphogypsum, 7 parts by weight of efficient curing agent and 525 parts by weight of water. The high-efficiency curing agent comprises 50 parts by weight of sulfonated formaldehyde-acetone polycondensate, 20 parts by weight of water glass, 10 parts by weight of sodium dodecyl sulfate, 10 parts by weight of water-soluble epoxy resin, 5 parts by weight of sulfonated oil, 5 parts by weight of sodium sulfate and 5 parts by weight of polyacrylamide; the water glass, the water-soluble epoxy resin and the polyacrylamide are calculated according to the weight parts of the effective components.
The technical indexes of the raw materials used in the embodiment are as follows:
the maximum particle size of the slag soil is 10.6cm, and the content of organic matters in the slag soil is 4.34 wt%.
The cement is PO42.5 ordinary portland cement.
The density of the superfine slag powder is 1.98g/cm3Specific surface area 492m2/kg。
The fineness of the fly ash (the balance of a 45-micron square-hole sieve) is 23.7 percent, the water demand ratio is 104 percent, and the loss on ignition is 3.19 percent.
The fineness of the phosphogypsum is not more than 200 meshes, the water content is 0.66 percent, and the content of heavy metal ions and radioactive substances is not more than 0.1 percent.
The molecular weight of the sulfonated formaldehyde-acetone polycondensate (SAF) is 4000-6000, and the water reducing efficiency is 21%.
The water glass modulus is 3.2, and the sodium silicate content is 34%.
The density of the water-soluble epoxy resin is 1.01g/cm3The content of effective components is 46 percent.
The sulfonated oil has a pH of 5.5.
The polyacrylamide has an effective component content of 92% and a density of 1.27g/cm3
Example 5
The multi-source solid waste composite high-flow backfill material comprises, by weight, 1000 parts of muck, 50 parts of cement, 10 parts of superfine slag powder, 15 parts of fly ash, 25 parts of phosphogypsum, 7 parts of an efficient curing agent and 425 parts of water. The high-efficiency curing agent comprises, by weight, 70 parts of sulfonated formaldehyde-acetone polycondensate, 24 parts of water glass, 12 parts of sodium dodecyl sulfate, 15 parts of water-soluble epoxy resin and 5 parts of sodium sulfate; the water glass and the water-soluble epoxy resin are calculated according to the weight parts of the effective components.
The technical indexes of the raw materials used in the embodiment are as follows:
the maximum particle size of the slag soil is 10.6cm, and the content of organic matters in the slag soil is 4.34 wt%.
The cement is PO42.5 common Portland cement and sulphoaluminate cement compounded according to the ratio of 4: 1.
The density of the superfine slag powder is 2.66g/cm3Specific surface area 500m2/kg。
The fineness of the fly ash (the screen residue of a 45-micron square-hole screen) is 23.4 percent, the water demand ratio is 104 percent, and the loss on ignition is 4.22 percent.
The fineness of the phosphogypsum is not more than 200 meshes, the water content is 0.68 percent, and the content of heavy metal ions and radioactive substances is not more than 0.1 percent.
The molecular weight of the sulfonated formaldehyde-acetone polycondensate (SAF) is 4000-6000, and the water reducing efficiency is 24%.
The water glass modulus is 2.8, and the sodium silicate content is 36 percent.
The density of the water-soluble epoxy resin is 1.08g/cm3The content of effective components is 46 percent.
Example 6
The multi-source solid waste composite high-flow backfill material comprises, by weight, 1000 parts of muck, 40 parts of cement, 15 parts of superfine slag powder, 20 parts of fly ash, 25 parts of phosphogypsum, 10 parts of an efficient curing agent and 350 parts of water. The high-efficiency curing agent comprises 50 parts by weight of sulfonated formaldehyde-acetone polycondensate, 24 parts by weight of water glass, 10 parts by weight of sodium dodecyl sulfate, 15 parts by weight of water-soluble epoxy resin and 5 parts by weight of polyacrylamide; the water glass, the water-soluble epoxy resin and the polyacrylamide are calculated according to the weight parts of the effective components.
The technical indexes of the raw materials used in the embodiment are as follows:
the maximum particle size of the slag soil is 19.6cm, and the content of organic matters in the slag soil is 4.34 wt%.
The cement is PO42.5 ordinary portland cement.
The density of the superfine slag powder is 1.45g/cm3Specific surface area 470m2/kg。
The fineness of the fly ash (the balance of a 45-micron square-hole sieve) is 22.7 percent, the water demand ratio is 101 percent, and the loss on ignition is 3.19 percent.
The fineness of the phosphogypsum is not more than 200 meshes, the water content is 0.86 percent, and the content of heavy metal ions and radioactive substances is not more than 0.1 percent.
The molecular weight of the sulfonated formaldehyde-acetone polycondensate (SAF) is 4000-6000, and the water reducing efficiency is 25%.
The water glass modulus is 2.9, and the sodium silicate content is 44%.
The density of the water-soluble epoxy resin is 1.01g/cm3The content of effective components is 45 percent.
The polyacrylamide has an effective component content of 93% and a density of 1.29g/cm3
The main performance test method of the invention is as follows:
testing the fluidity: the flowability of the backfill mixture was measured according to the consistency test method of GB/T17669.4-1999 determination of physical Properties of neat building Gypsum slurries. The test grinding tool is a stainless steel cylinder with the inner diameter of 50 +/-0.1 mm and the height of 100 +/-0.1 mm.
Unconfined compressive strength test: the unconfined compressive strength of the backfill material 28d is determined according to the compressive strength test method of GB/T50123-1999 geotechnical test method Standard. The compression rate was 1.20 mm/min.
And (3) durability test: measuring the compressive strength of the backfill material after being subjected to sulfate attack for 15, 30 and 60 times according to a sulfate attack resistance experiment method of GB/T50082-2009 test method standard for long-term performance and durability of common soil concrete, and obtaining compressive strength corrosion resistance coefficients KS30, KS60 and KS90 according to formula 1 to represent the durability of the backfill material.
Figure BDA0003083400920000081
In the formula: kf-compression strength corrosion resistance (%); f. ofc0-standard curing for the same number of days the measured value of the compressive strength (MPa) of the concrete; f. ofcn-determination of the compressive strength (MPa) of the concrete after n times of attack by sulphate.
In order to ensure the reliability of the test, each group of samples needs to be subjected to at least 3 parallel tests, and the average value is taken as the final test data. Wherein, the test results of the fluidity are shown in Table 1, the test results of the unconfined compressive strength are shown in Table 2, and the test results of the compressive strength and the corrosion resistance coefficient are shown in Table 3.
Table 1 results of fluidity test in examples 1 to 6
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6
Fluidity (mm) 182 190 188 178 190 195
TABLE 2 test results of infinite compressive strength properties of examples 1 to 6
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6
Compressive Strength (kPa) 1250 980 2200 1300 1100 1220
Table 3 test results of compressive strength and corrosion resistance coefficients of examples 1 to 6
Figure BDA0003083400920000082
The multi-source solid waste composite high flow backfill material of the invention has excellent fluidity, unconfined compressive strength and sulfate erosion resistance as shown by examples 1-6, but the examples are not intended to limit the invention, and the invention can be modified and changed by those skilled in the art. 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 multi-source solid waste composite high-flow-state backfill material is characterized by comprising the following components in parts by weight: 950-1050 parts of muck, 40-60 parts of cement, 10-20 parts of superfine slag powder, 10-20 parts of fly ash, 20-30 parts of phosphogypsum, 7-15 parts of efficient curing agent and 275-525 parts of water; the efficient curing agent comprises, by weight, 50-70 parts of sulfonated formaldehyde-acetone polycondensate, 20-30 parts of water glass, 10-20 parts of sodium dodecyl sulfate, 10-20 parts of water-soluble epoxy resin, 0-10 parts of sulfonated oil, 0-10 parts of sodium sulfate and 0-10 parts of polyacrylamide, wherein the water glass, the water-soluble epoxy resin and the polyacrylamide are calculated according to the weight parts of active ingredients.
2. The backfill material according to claim 1, characterized in that the high-efficiency curing agent comprises 50-70 parts by weight of sulfonated formaldehyde-acetone polycondensate, 20-25 parts by weight of water glass, 10-20 parts by weight of sodium dodecyl sulfate, 10-15 parts by weight of water-soluble epoxy resin, 5-10 parts by weight of sulfonated oil, 5-10 parts by weight of sodium sulfate and 5-10 parts by weight of polyacrylamide, wherein the water glass, the water-soluble epoxy resin and the polyacrylamide are calculated according to the weight parts of effective components.
3. The backfill material according to claim 1, characterized in that the slag soil has a maximum particle size of less than or equal to 20cm and an organic matter content of less than or equal to 5.0 wt%.
4. The backfill material according to claim 1, wherein the cement is one or more of ordinary portland cement P.O ≥ 42.5 or sulphoaluminate cement.
5. The backfill material according to claim 1, characterized in that the ultrafine slag powder bulk density is greater than or equal to 1.3g/cm3The specific surface area is more than or equal to 450m2Per kg; the fly ash is secondary fly ash, the balance of a 45-micron square-hole sieve is less than or equal to 25 percent, the water demand ratio is less than or equal to 105 percent, the ignition loss is less than or equal to 8.0 percent, the phosphogypsum is solid waste generated in a wet-process phosphoric acid process, the fineness is not more than 200 meshes, the water content is less than 1 percent, and heavy metal ions and radioactive substances contain heavy metal ions and radioactive substancesThe amount is less than or equal to 0.1 percent.
6. The backfill material according to claim 1, wherein the molecular weight of the sulfonated formaldehyde-acetone polycondensate is 4000-6000, and the water reducing efficiency is 20-25%; the pH value of the sulfonated oil is 5-7, and the stabilizing time of the sulfonated oil in water is more than or equal to 12 hours.
7. The backfill material according to claim 1, wherein the water glass modulus is 2.4-3.2, and the sodium silicate content is less than or equal to 50%; the density of the water-soluble epoxy resin is 1.00-1.10 g/cm3The content of effective components is 45-55%; the content of the effective components of the polyacrylamide is more than or equal to 90 percent, and the density is 1.25-1.35 g/cm3
8. The preparation method of the multi-source solid waste composite high-flow-state backfill material according to any one of claims 1 to 7, characterized by comprising the following steps:
dissolving the components of the high-efficiency curing agent in water to obtain a high-efficiency curing agent solution for later use, pouring the residue soil, the cement, the superfine slag powder, the fly ash and the phosphogypsum into a stirrer to be uniformly mixed, then adding the prepared high-efficiency curing agent solution, and stirring for 3-5 min; and obtaining the multi-source solid waste composite high-flow backfill material.
9. The application of the multi-source solid waste composite high-flow-state backfill material according to any one of claims 1 to 7 in a foundation or foundation trench construction environment.
10. Use according to claim 9, characterised in that the basic groove is a profiled basic groove.
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