CN114956770A - High-performance non-calcium-based engineering muck curing agent and engineering muck curing method - Google Patents
High-performance non-calcium-based engineering muck curing agent and engineering muck curing method Download PDFInfo
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- CN114956770A CN114956770A CN202210542613.2A CN202210542613A CN114956770A CN 114956770 A CN114956770 A CN 114956770A CN 202210542613 A CN202210542613 A CN 202210542613A CN 114956770 A CN114956770 A CN 114956770A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 32
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 239000011575 calcium Substances 0.000 title claims abstract description 20
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 20
- 238000001723 curing Methods 0.000 title abstract description 42
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 49
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 35
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 35
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000002689 soil Substances 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 29
- 239000000853 adhesive Substances 0.000 claims abstract description 22
- 230000001070 adhesive effect Effects 0.000 claims abstract description 22
- 239000004094 surface-active agent Substances 0.000 claims abstract description 21
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 20
- 239000002270 dispersing agent Substances 0.000 claims abstract description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 8
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 13
- 229920002401 polyacrylamide Polymers 0.000 claims description 13
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 13
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 11
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 11
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 11
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 11
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 11
- 229920005610 lignin Polymers 0.000 claims description 11
- 239000000661 sodium alginate Substances 0.000 claims description 11
- 235000010413 sodium alginate Nutrition 0.000 claims description 11
- 229940005550 sodium alginate Drugs 0.000 claims description 11
- 229920003064 carboxyethyl cellulose Polymers 0.000 claims description 9
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 9
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 9
- GGHPAKFFUZUEKL-UHFFFAOYSA-M sodium;hexadecyl sulfate Chemical compound [Na+].CCCCCCCCCCCCCCCCOS([O-])(=O)=O GGHPAKFFUZUEKL-UHFFFAOYSA-M 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- NWZBFJYXRGSRGD-UHFFFAOYSA-M sodium;octadecyl sulfate Chemical compound [Na+].CCCCCCCCCCCCCCCCCCOS([O-])(=O)=O NWZBFJYXRGSRGD-UHFFFAOYSA-M 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 239000010754 BS 2869 Class F Substances 0.000 claims 1
- 238000004132 cross linking Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract 2
- 239000003583 soil stabilizing agent Substances 0.000 description 10
- 238000010276 construction Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 239000011398 Portland cement Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000004266 EU approved firming agent Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005056 compaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004162 soil erosion Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- 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
- C04B28/30—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 magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention provides a high-performance non-calcium-based engineering muck curing agent and an engineering muck curing method, wherein the curing agent comprises the following components in parts by weight: 30-45 parts of active magnesium oxide, 10-25 parts of magnesium chloride, 20-30 parts of fly ash, 5-10 parts of adhesive, 0.4-5 parts of dispersant and 5-10 parts of surfactant; the active magnesium oxide is light-burned alumina powder, the content of the active magnesium oxide in the light-burned alumina powder is more than or equal to 85%, and the magnesium chloride is anhydrous magnesium chloride powder. The non-calcium-based soil curing agent prepared by the invention has simple preparation process and mild preparation conditions, and the curing agent can be added into the engineering muck to perform a crosslinking reaction with the muck, so that the compressive strength of the cured muck mixture is enhanced, and the reutilization of the engineering muck is realized.
Description
Technical Field
The invention relates to the technical field of engineering materials, in particular to a high-performance non-calcium-based engineering muck curing agent and an engineering muck curing method.
Background
Along with the rapid development of urban construction, the production amount of engineering muck in the construction process is increased rapidly, the comprehensive utilization rate of the engineering muck is low, the engineering muck becomes an important environmental problem restricting the sustainable development of the urban construction, and the resource utilization of the engineering muck is a future development trend. More recycling treatment modes of the engineering muck are explored, the feasibility direction of the system is provided for the recycling treatment, and the method has important significance for ecological environmental protection and economic development.
A large amount of engineering soil is needed for traditional infrastructure, highways, municipal roads, railways, building filling and the like, and a series of environmental problems such as river bed scouring, soil erosion, ecological environment damage and the like are easily caused by the general ways of digging cultivated land, river bed sand mining, mountain mining stone mining and the like. However, with the continuous tightening of environmental protection policies, the exploitation of building materials such as roadbed materials, pipeline backfill and the like is increasingly limited, and the utilization of engineering muck for modification and resource utilization is an effective way for solving the problem of shortage of engineering muck and building materials.
Engineering muck often has the reasons such as high moisture content, poor mechanical properties and can not be directly utilized, and the solidification technology is an effective mode for solidifying and improving the engineering muck for reuse.
The existing soil firming agents are in various types and mainly comprise inorganic firming agents, organic firming agents, ionic firming agents and biological enzyme firming agents. Inorganic curing agents are generally powdery, and are modified and remodeled by traditional curing materials such as cement, lime, fly ash and slag, so that the inorganic curing agents become comprehensive and stable curing materials. The curing agent has the advantages of low cost, good strength stability and the like; the defects are that the influence on the environment is large, the transportation cost is high, the consumption of the curing agent is large and the like, so that the application in the municipal road base course construction is gradually reduced. The organic curing agent mainly comprises a surfactant, cellulose and the like, the surfactant is used for changing the surface hydrophilicity of soil, or organic polymers are used for crosslinking soil particles, and the soil is reinforced through gel adsorption, wrapping and filling effects, so that the soil is compacted to obtain better pressure resistance. The ionic soil stabilizer reduces the hydrophilicity of soil particles mainly through ion exchange, thereby realizing soil body reinforcement.
At present, domestic research on soil curing agents mainly focuses on the research on portland cement systems, the curing effect is further improved by adding other additives into the traditional portland cement, but the production of calcium-based curing agents represented by the traditional cement often faces a great challenge of carbon dioxide emission reduction, and the requirements of energy conservation, emission reduction and resource utilization cannot be met only by research and development of the traditional calcium-based cement.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a high-performance non-calcium-based engineering muck curing agent, which is used for curing and improving engineering muck, realizing the application of the engineering muck to a base layer or a bottom layer of a road and realizing resource utilization. In addition, the invention also provides a method for solidifying the engineering muck.
In order to achieve the above objects and other related objects, the present invention adopts the following technical solutions:
the invention provides a high-performance non-calcium-based engineering muck curing agent, which comprises the following components in parts by weight: 30-45 parts of active magnesium oxide, 10-25 parts of magnesium chloride, 20-30 parts of fly ash, 5-10 parts of adhesive, 0.4-5 parts of dispersant and 5-10 parts of surfactant; the active magnesium oxide is light-burned alumina powder, the content of the active magnesium oxide in the light-burned alumina powder is more than or equal to 85%, and the magnesium chloride is anhydrous magnesium chloride powder.
As a preferable technical scheme, the fly ash is F-type fly ash, wherein the total mass fraction of silicon dioxide, aluminum oxide and ferric oxide is more than or equal to 75%.
As a preferable technical scheme, the adhesive is one or any combination of at least two of polyacrylamide, sodium alginate and sodium polyacrylate.
Preferably, the dispersant is one or any combination of at least two of carboxymethyl cellulose, lignin fiber and carboxyethyl cellulose.
According to a preferable technical scheme, the surfactant is one or any combination of two of sodium dodecyl benzene sulfonate, sodium hexadecyl sulfate and sodium octadecyl sulfate.
The second aspect of the invention provides an engineering muck curing method, which adopts the high-performance non-calcium-based engineering muck curing agent and comprises the following steps:
step one, crushing and screening engineering muck;
step two, preparing according to mass percent, adding 5-10 parts of curing agent into each 100 parts of engineering muck, and mechanically stirring and uniformly mixing to obtain a cured muck mixture;
thirdly, filling and compacting the uniformly mixed solidified slag-soil mixture according to the technical Specification for highway subgrade construction (JTG/T3610-2019) specification to obtain solidified stabilized soil;
step four, curing the solidified stabilized soil after rolling, wherein the curing period is more than 7d, modes such as watering curing, film covering, geotextile covering curing and the like can be adopted, and the engineering muck and the curing agent have hydration reaction and polymerization reaction during the curing period;
step five, detecting the compactness and compressive strength of the solidified stabilized soil; detecting the compactness according to technical Specification for highway subgrade construction (JTG/T3610 and 2019); the degree of compaction and 7d unconfined compressive strength were tested according to the road geotechnical test code (JTG 3430-.
Preferably, in the first step, particles with a particle size of more than or equal to 100mm in the engineering residue soil are removed by screening.
Preferably, in the second step, the optimum moisture content of the solidified stabilized soil is 2%.
The invention creatively provides a non-calcium-based soil curing agent, which is prepared by compounding active magnesium oxide powder, magnesium chloride powder, fly ash, an adhesive, a dispersant and a surfactant. The cement can replace the traditional portland cement and lime to be applied to roadbed improvement, has the outstanding advantages of high compressive strength, durability, water stability, energy conservation, environmental protection and the like, plays a positive promoting role in resource utilization of engineering muck, and has wide market application.
As described above, the present invention has the following advantageous effects:
(1) compared with the existing curing agent, the invention solves the problems of serious resource and energy consumption in the production process of the traditional portland cement gel material, and serious carbon emission caused by releasing a large amount of carbon dioxide gas, and is contradictory to the green, environment-friendly and low-carbon mode advocated by the national 'double-carbon' strategy.
(2) The non-calcium-based soil curing agent disclosed by the invention forms a MgO-SiO2-H2O ternary gel system under the conditions of normal temperature and normal pressure, and is modified by doping an adhesive, a dispersing agent and a surfactant, so that the generated gel and hydrate crystals can improve the curing strength of muck, the engineering construction requirements are met, and the soil body and the curing agent are mixed by simple machinery, so that the construction is simple and convenient.
(3) According to the curing agent disclosed by the invention, a hydrated gel system formed by active magnesium oxide, magnesium chloride and fly ash has higher strength by doping the modified material, and meanwhile, the curing system is endowed with excellent water stability.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Example 1
The soil stabilizer of the embodiment is prepared by mixing the following raw materials in percentage by weight: 40 parts of active magnesium oxide (MgO), 10 parts of magnesium chloride, 30 parts of fly ash, 10 parts of adhesive, 2 parts of dispersant and 8 parts of surfactant.
The active magnesium oxide is light-burned alumina powder, the content of the active magnesium oxide in the light-burned alumina powder is more than or equal to 85%, and the magnesium chloride is anhydrous magnesium chloride powder.
The adhesive is one or any combination of at least two of polyacrylamide, sodium alginate and sodium polyacrylate, and the preferred embodiment of the adhesive is composed of polyacrylamide and sodium alginate in a mass ratio of 10: 1.
The dispersant is one or any combination of at least two of carboxymethyl cellulose, lignin fiber and carboxyethyl cellulose, and carboxymethyl cellulose is preferably selected as the embodiment.
The surfactant is one or any combination of two of sodium dodecyl benzene sulfonate, sodium hexadecyl sulfate and sodium octadecyl sulfate, and the embodiment is preferably the sodium dodecyl benzene sulfonate.
Example 2
The soil stabilizer of the embodiment is prepared by mixing the following raw materials in percentage by weight: 40 parts of active magnesium oxide (MgO), 12 parts of magnesium chloride, 25 parts of fly ash, 10 parts of adhesive, 3 parts of dispersant and 10 parts of surfactant.
The active magnesium oxide is light-burned alumina powder, the content of the active magnesium oxide in the light-burned alumina powder is more than or equal to 85%, and the magnesium chloride is anhydrous magnesium chloride powder.
The adhesive is one or any combination of at least two of polyacrylamide, sodium alginate and sodium polyacrylate, and polyacrylamide is preferred in the embodiment.
The dispersant is one or any combination of at least two of carboxymethyl cellulose, lignin fiber and carboxyethyl cellulose, and the lignin fiber is preferably used in the embodiment.
The surfactant is one or any combination of two of sodium dodecyl benzene sulfonate, sodium hexadecyl sulfate and sodium octadecyl sulfate, and the sodium dodecyl benzene sulfonate is preferably selected in the embodiment.
Example 3
The soil stabilizer of the embodiment is prepared by mixing the following raw materials in percentage by weight: 45 parts of active magnesium oxide (MgO), 15 parts of magnesium chloride, 25 parts of fly ash, 5 parts of adhesive, 2 parts of dispersant and 8 parts of surfactant.
The active magnesium oxide is light-burned alumina powder, the content of the active magnesium oxide in the light-burned alumina powder is more than or equal to 85%, and the magnesium chloride is anhydrous magnesium chloride powder.
The adhesive is one or any combination of at least two of polyacrylamide, sodium alginate and sodium polyacrylate, and the preferred embodiment of the adhesive is composed of polyacrylamide and sodium alginate in a mass ratio of 10: 1.
The dispersant is one or any combination of at least two of carboxymethyl cellulose, lignin fiber and carboxyethyl cellulose, and the lignin fiber is preferably used in the embodiment.
The surfactant is one or any combination of two of sodium dodecyl benzene sulfonate, sodium hexadecyl sulfate and sodium octadecyl sulfate, and in the embodiment, the sodium dodecyl benzene sulfonate is preferably selected.
Example 4
The soil stabilizer of the embodiment is prepared by mixing the following raw materials in percentage by weight: 45 parts of active magnesium oxide (MgO), 12 parts of magnesium chloride, 30 parts of fly ash, 5 parts of adhesive, 1 part of dispersant and 7 parts of surfactant.
The active magnesium oxide is light-burned alumina powder, the content of the active magnesium oxide in the light-burned alumina powder is more than or equal to 85%, and the magnesium chloride is anhydrous magnesium chloride powder.
The adhesive is one or any combination of at least two of polyacrylamide, sodium alginate and sodium polyacrylate, and sodium polyacrylate is preferred in the embodiment.
The dispersant is one or any combination of at least two of carboxymethyl cellulose, lignin fiber and carboxyethyl cellulose, and carboxyethyl cellulose is preferred in the embodiment.
The surfactant is one or any combination of two of sodium dodecyl benzene sulfonate, sodium hexadecyl sulfate and sodium octadecyl sulfate, and the sodium hexadecyl sulfate is preferably used in the embodiment.
Example 5
The soil stabilizer of the embodiment is prepared by mixing the following raw materials in percentage by weight: 35 parts of active magnesium oxide (MgO), 20 parts of magnesium chloride, 30 parts of fly ash, 5 parts of adhesive, 2 parts of dispersant and 8 parts of surfactant.
The active magnesium oxide is light-burned alumina powder, the content of the active magnesium oxide in the light-burned alumina powder is more than or equal to 85%, and the magnesium chloride is anhydrous magnesium chloride powder.
The adhesive is one or any combination of at least two of polyacrylamide, sodium alginate and sodium polyacrylate, and the preferred adhesive in the embodiment is composed of the polyacrylamide and the sodium alginate in a mass ratio of 10: 1.
The dispersant is one or any combination of at least two of carboxymethyl cellulose, lignin fiber and carboxyethyl cellulose, and the preferred embodiment is the combination of carboxymethyl cellulose and lignin fiber, wherein the mass ratio is 1: 1.
The surfactant is one or any combination of two of sodium dodecyl benzene sulfonate, sodium hexadecyl sulfate and sodium octadecyl sulfate, and the sodium dodecyl benzene sulfonate is preferably selected in the embodiment.
Example 6
The soil stabilizer of the embodiment is prepared by mixing the following raw materials in percentage by weight: 35 parts of active magnesium oxide (MgO), 20 parts of magnesium chloride, 30 parts of fly ash, 8 parts of adhesive, 2 parts of dispersant and 5 parts of surfactant.
The active magnesium oxide is light-burned alumina powder, the content of the active magnesium oxide in the light-burned alumina powder is more than or equal to 85%, and the magnesium chloride is anhydrous magnesium chloride powder.
The adhesive is one or any combination of at least two of polyacrylamide, sodium alginate and sodium polyacrylate, and polyacrylamide is preferred in the embodiment.
The dispersant is one or any combination of at least two of carboxymethyl cellulose, lignin fiber and carboxyethyl cellulose, and carboxymethyl cellulose is preferred in the embodiment.
The surfactant is one or any combination of two of sodium dodecyl benzene sulfonate, sodium hexadecyl sulfate and sodium octadecyl sulfate, and the sodium dodecyl benzene sulfonate is preferably selected in the embodiment.
The application method of the embodiments 1 to 6 is as follows:
crushing and screening the engineering muck, removing trees, weeds and the like in the engineering muck, and removing particles with the muck particle size of more than or equal to 100mm through screening;
the engineering slag soil is prepared according to the mass percentage, 100 parts of engineering slag soil and 5 parts of curing agent are mixed evenly through mechanical stirring; filling and compacting the uniformly mixed solidified residue soil mixture according to the technical specification for highway subgrade construction (JTG/T3610-2019), and controlling the water content of the solidified stable soil to be about +/-2% of the optimal water content; and carrying out 7d curing. The 7d unconfined compressive strength is detected according to the highway geotechnical test code (JTG 3430) 2020).
Comparative example
The procedure of examples 1 to 6 was followed, except that the soil stabilizer of the present invention was not added, and ordinary portland cement was added to obtain cement soil.
The test results of the compressive strength and the compactness of the high-performance non-calcium-based soil stabilizer are shown in the subscript 1:
table 1 compressive strength and compactibility test results:
| 7d unconfined compressive strength (MPa) | Degree of compaction | |
| Example 1 | 1.67 | 96.26％ |
| Example 2 | 1.57 | 96.79 |
| Example 3 | 1.46 | 94.58 |
| Example 4 | 1.41 | 93.92 |
| Example 5 | 1.21 | 92.75 |
| Example 6 | 1.32 | 92.94 |
| Comparative example | 0.79 | 92.85 |
Comparing the results of examples 1-6 with the results of comparative examples, it can be seen that the application of the high-performance non-calcium-based soil stabilizer provided by the invention and the improvement of the muck can obviously improve the compressive strength of the muck, and the 7d unconfined compressive strength is improved by about 2 times compared with the cement soil formed by adding ordinary portland cement. The degree of compaction can also meet relevant specification requirements. The solidified engineering residue soil mixture can be used as a road pavement foundation pit material, and the solidified residue soil mixture has good economical efficiency and environmental protection.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. The high-performance non-calcium-based engineering muck curing agent is characterized by comprising the following components in parts by weight: 30-45 parts of active magnesium oxide, 10-25 parts of magnesium chloride, 20-30 parts of fly ash, 5-10 parts of adhesive, 0.4-5 parts of dispersant and 5-10 parts of surfactant; the active magnesium oxide is light-burned alumina powder, the content of the active magnesium oxide in the light-burned alumina powder is greater than or equal to 85%, and the magnesium chloride is anhydrous magnesium chloride powder.
2. The high-performance non-calcium-based engineering muck curing agent as claimed in claim 1, wherein the fly ash is class F fly ash, wherein the total mass fraction of silicon dioxide, aluminum oxide and ferric oxide is greater than or equal to 75%.
3. The high-performance non-calcium-based engineering muck curing agent as claimed in claim 1, wherein the adhesive is one or any combination of at least two of polyacrylamide, sodium alginate and sodium polyacrylate.
4. The high-performance non-calcium-based engineering muck curing agent as claimed in claim 1, wherein the dispersant is one or any combination of at least two of carboxymethyl cellulose, lignin fiber and carboxyethyl cellulose.
5. The high-performance non-calcium-based engineering muck curing agent as claimed in claim 1, wherein the surfactant is one or any combination of two of sodium dodecyl benzene sulfonate, sodium hexadecyl sulfate and sodium octadecyl sulfate.
6. The method for curing the engineering muck by using the high-performance non-calcium-based engineering muck curing agent as claimed in any one of claims 1 to 5 is characterized by comprising the following steps of:
step one, crushing and screening engineering muck;
step two, preparing according to mass percent, adding 5-10 parts of curing agent into each 100 parts of engineering muck, and mechanically stirring and uniformly mixing to obtain a cured muck mixture;
step three, filling and compacting the uniformly mixed solidified residue soil mixture to obtain solidified stable soil;
step four, curing the solidified stabilized soil after rolling;
and step five, detecting the compactness and compressive strength of the solidified stabilized soil.
7. The method for solidifying the engineering muck as claimed in claim 6, wherein in the first step, particles with the particle size of more than or equal to 100mm in the engineering muck are removed by screening.
8. The method for solidifying engineering residual soil according to claim 6, wherein in the second step, the optimal water content of the solidified stabilized soil is 2%.
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| CN115807366A (en) * | 2022-11-03 | 2023-03-17 | 深圳宏垚环保科技有限公司 | Roadbed construction method for recycling premixed solidified soil from aggregate-containing filling screening tailings |
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| CN115807366A (en) * | 2022-11-03 | 2023-03-17 | 深圳宏垚环保科技有限公司 | Roadbed construction method for recycling premixed solidified soil from aggregate-containing filling screening tailings |
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Address after: 200092 floor 10, building 1, No. 901, Zhongshan North Second Road, Yangpu District, Shanghai Applicant after: SHANGHAI SHENHUAN ENVIRONMENTAL ENGINEERING Co.,Ltd. Address before: No. 901, Zhongshan Second Road, Yangpu District, Shanghai 200092 Applicant before: SHANGHAI SHENHUAN ENVIRONMENTAL ENGINEERING Co.,Ltd. |
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Application publication date: 20220830 |