CN116854399A - Additive for rapidly improving grouting strength of solidified soil and preparation method thereof - Google Patents
Additive for rapidly improving grouting strength of solidified soil and preparation method thereof Download PDFInfo
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- CN116854399A CN116854399A CN202310794940.1A CN202310794940A CN116854399A CN 116854399 A CN116854399 A CN 116854399A CN 202310794940 A CN202310794940 A CN 202310794940A CN 116854399 A CN116854399 A CN 116854399A
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- 239000002689 soil Substances 0.000 title claims abstract description 117
- 239000000654 additive Substances 0.000 title claims abstract description 64
- 230000000996 additive effect Effects 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title abstract description 24
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 42
- 239000004841 bisphenol A epoxy resin Substances 0.000 claims abstract description 30
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 30
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 28
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 27
- 229920001451 polypropylene glycol Polymers 0.000 claims abstract description 27
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 23
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000010457 zeolite Substances 0.000 claims abstract description 23
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 claims abstract description 21
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 claims abstract description 21
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 21
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 21
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 20
- 239000010881 fly ash Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 20
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000011398 Portland cement Substances 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 19
- -1 alkyl dimethyl benzyl ammonium chloride Chemical compound 0.000 claims abstract description 19
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 19
- 235000010755 mineral Nutrition 0.000 claims abstract description 19
- 239000011707 mineral Substances 0.000 claims abstract description 19
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 19
- 229920000642 polymer Polymers 0.000 claims abstract description 19
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 19
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 19
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims description 52
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 23
- 238000002156 mixing Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 11
- 239000004593 Epoxy Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 9
- XJKVPKYVPCWHFO-UHFFFAOYSA-N silicon;hydrate Chemical compound O.[Si] XJKVPKYVPCWHFO-UHFFFAOYSA-N 0.000 claims description 9
- 239000003583 soil stabilizing agent Substances 0.000 claims description 6
- 239000003516 soil conditioner Substances 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 13
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application discloses an additive for rapidly improving grouting strength of solidified soil, which comprises the following raw materials: bisphenol A epoxy resin, graphene oxide, montmorillonite, superfine zeolite powder, magnesium sulfate whisker, poly (propylene glycol) -silane-poly (ethylene glycol) and phthalic anhydride. The application discloses a preparation method of the additive. The application discloses a soil curing agent, which comprises the following raw materials in parts by mass: 20-40 parts of ordinary Portland cement, 10-20 parts of fly ash, 5-15 parts of mineral powder, 1-5 parts of steel slag, 2-7 parts of sodium silicate, 1-2 parts of polycarboxylic acid polymer, 1-5 parts of hydrophobic nano silicon oxide, 2-12 parts of the additive, 1-3 parts of sodium hexametaphosphate, 1-2 parts of alkyl dimethyl benzyl ammonium chloride and 100-150 parts of water. The application discloses a preparation method of the soil curing agent. The application discloses a use method of the soil solidifying agent.
Description
Technical Field
The application relates to the technical field of solidified soil, in particular to an additive for rapidly improving grouting strength of solidified soil and a preparation method thereof, a soil solidifying agent and a preparation method and a use method thereof.
Background
Soil solidifying agents are materials that change the engineering properties of soil through a series of physical or chemical reactions after mixing with the soil. The inorganic curing additive materials commonly used at present are cement, slag, fly ash, lime, sodium silicate and the like, and the inorganic curing additive materials are good in construction stability and low in cost, and are widely popularized and applied at present. However, the existing soil curing agents basically need mechanical compaction and other processes, the cured soil has no fluidity, and particularly for the liquid soil curing agents, the soil can be cured and reinforced basically through compaction.
The existing soil curing agent generally has the problem of low fluidity, and particularly for a construction space with a narrow working surface, the existing soil curing agent still needs to be flattened by matching with manpower, if the slump of the cured soil mixture is further improved, for example, the slump exceeds 180mm, a large proportion of dispersing agent is often required to be added in multiple, so that the construction cost is greatly improved, the fluidity improving effect of the dispersing agent is not obvious due to the fact that the consumption of the dispersing agent is increased in multiple, the prepared cured soil mixture still has the defect of poor fluidity, and the problems of segregation, bleeding, hardening and the like are easy to occur.
Disclosure of Invention
The application aims to solve the defects in the prior art, and provides an additive for rapidly improving grouting strength of solidified soil, a preparation method of the additive, a soil solidifying agent, a preparation method of the soil solidifying agent and a use method of the soil solidifying agent.
An additive for rapidly improving grouting strength of solidified soil, which comprises the following raw materials: bisphenol A epoxy resin, graphene oxide, montmorillonite, superfine zeolite powder, magnesium sulfate whisker, poly (propylene glycol) -silane-poly (ethylene glycol) and phthalic anhydride; bisphenol A epoxy resin, graphene oxide, montmorillonite, superfine zeolite powder, magnesium sulfate whisker, poly (propylene glycol) -silane-poly (ethylene glycol) and phthalic anhydride in a mass ratio of 20-40:1-2:1-5:1-5:1-5:5-15:1-2.
Preferably, the bisphenol A epoxy resin has an epoxy value of 0.42 to 0.54eq/100g.
Preferably, the particle size of the superfine zeolite powder is 10-50nm.
Preferably, the aspect ratio of the magnesium sulfate whisker is >33.
The preparation method of the additive comprises the following steps:
s1, continuously stirring magnesium sulfate whiskers at 60-70 ℃, dropwise adding poly (propylene glycol) -silane-poly (ethylene glycol) in the stirring process, completely continuously stirring, cooling to room temperature, then dispersing the mixture and graphene oxide into N, N-dimethylformamide, stirring for 2-5 hours at 60-70 ℃, cooling, centrifuging, and drying to obtain a prefabricated material;
s2, adding the prefabricated material into bisphenol A epoxy resin, decompressing and pumping, adding phthalic anhydride, uniformly mixing, defoaming, continuously adding montmorillonite and superfine zeolite powder, and stirring at room temperature to obtain the curing additive.
The soil curing agent comprises the following raw materials in parts by mass: 20-40 parts of ordinary Portland cement, 10-20 parts of fly ash, 5-15 parts of mineral powder, 1-5 parts of steel slag, 2-7 parts of sodium silicate, 1-2 parts of polycarboxylic acid polymer, 1-5 parts of hydrophobic nano silicon oxide, 2-12 parts of the additive, 1-3 parts of sodium hexametaphosphate, 1-2 parts of alkyl dimethyl benzyl ammonium chloride and 100-150 parts of water.
The preparation method of the soil curing agent comprises the following steps: uniformly mixing ordinary Portland cement, fly ash, mineral powder, steel slag, sodium silicate, polycarboxylic acid polymer, hydrophobic nano silicon oxide and water to obtain premix; adding the additive, sodium hexametaphosphate and alkyl dimethyl benzyl ammonium chloride into the premix, stirring, and maintaining at 25-32 ℃ for 1-4 hours to obtain the soil curing agent.
The application method of the soil stabilizer comprises the steps of applying the soil stabilizer into soil, wherein the mass ratio of the soil stabilizer to the soil is 1-2:10000, mixing and curing.
The technical effects of the application are as follows:
the application combines the hydrophilic end of poly (propylene glycol) -silane-poly (ethylene glycol) with the magnesium sulfate whisker, and combines the hydrophobic end with bisphenol A epoxy resin, thereby not only promoting the magnesium sulfate whisker to have better dispersibility, improving the efficiency and the service life of fluid for treating soil, but also not affecting the fluidity of grouting process and greatly improving grouting efficiency.
The soil curing agent takes ordinary silicate cement as a base material, wherein the additive not only promotes other materials to be uniformly dispersed in the base material, but also promotes bisphenol A epoxy resin and poly (propylene glycol) -silane-poly (ethylene glycol) in the additive to be compounded after curing the cured soil, so that the cured soil is rapidly cured and forms a whole, meanwhile, the amphiphilicity characteristic of the additive can promote the inter-particle attraction to be increased, the overall thickness of soil particles and the cured soil can be reduced, and the crystal surfaces newly generated by aggregation and condensation of clay particles are provided with hydroxyl groups, so that bisphenol A epoxy resin can be attracted to be attached to the surfaces, the surface electrification of the soil particles is weakened, and the soil and the curing agent are mutually close to each other, so that the cured soil is more compact and has higher mechanical strength.
The graphene oxide contains active carboxyl groups, the active carboxyl groups are grafted on a magnesium sulfate structure under the action of poly (propylene glycol) -silane-poly (ethylene glycol), and the magnesium sulfate single crystal fiber structure and the two-dimensional lattice structure of the graphene oxide are cooperatively alternated in a matrix, so that the overall strength of the solidified soil is improved, and compared with the structure without the graphene oxide, the structure has an alternated and crosslinked network structure, and the system stability of the solidified soil is obviously enhanced.
The curing agent can promote the solid particles of the cured soil to be tightly adhered, has less gaps, improves the structural strength, and ensures that the internal structure of the cured soil is compact and has high adhesive strength.
Drawings
FIG. 1 is a graph showing comparison of unconfined compressive strength 7 days after soil is cured using the soil conditioner obtained in example 5 and comparative examples 1-2.
FIG. 2 is a graph showing the flexural strength after soil is cured by using the soil-curing agents obtained in example 5 and comparative examples 1 to 2.
Detailed Description
The application is further illustrated below in connection with specific embodiments.
Example 1
An additive for rapidly improving grouting strength of solidified soil, which comprises the following raw materials: 20kg of bisphenol A epoxy resin with the epoxy value of 0.42eq/100g, 1kg of graphene oxide, 1kg of montmorillonite, 1kg of superfine zeolite powder with the particle size of 10-50nm, 1kg of magnesium sulfate whisker with the length-diameter ratio of more than 33, 5kg of poly (propylene glycol) -silane-poly (ethylene glycol) and 1kg of phthalic anhydride.
The preparation method of the additive comprises the following steps:
s1, continuously stirring magnesium sulfate whiskers at a temperature of 60 ℃, dropwise adding poly (propylene glycol) -silane-poly (ethylene glycol) in the stirring process, completely continuously stirring, cooling to room temperature, then dispersing the mixture and graphene oxide into N, N-dimethylformamide, stirring for 2 hours at the temperature of 60 ℃, cooling, centrifuging, and drying to obtain a prefabricated material;
s2, adding the prefabricated material into bisphenol A epoxy resin, decompressing and pumping, adding phthalic anhydride, uniformly mixing, defoaming, continuously adding montmorillonite and superfine zeolite powder, and stirring at room temperature to obtain the curing additive.
A soil solidifying agent comprises the following raw materials: 20kg of ordinary Portland cement, 10kg of fly ash, 5kg of mineral powder, 1kg of steel slag, 2kg of sodium silicate, 1kg of polycarboxylic acid polymer, 1kg of hydrophobic nano silicon oxide, 2kg of the additive, 1kg of sodium hexametaphosphate, 1kg of alkyl dimethyl benzyl ammonium chloride and 100kg of water.
The preparation method of the soil curing agent comprises the following steps: uniformly mixing ordinary Portland cement, fly ash, mineral powder, steel slag, sodium silicate, polycarboxylic acid polymer, hydrophobic nano silicon oxide and water to obtain premix; adding the additive, sodium hexametaphosphate and alkyl dimethyl benzyl ammonium chloride into the premix, stirring, and maintaining at 25 ℃ for 1h to obtain the soil curing agent.
Example 2
An additive for rapidly improving grouting strength of solidified soil, which comprises the following raw materials: 40kg of bisphenol A epoxy resin with the epoxy value of 0.54eq/100g, 2kg of graphene oxide, 5kg of montmorillonite, 5kg of superfine zeolite powder with the particle size of 10-50nm, 5kg of magnesium sulfate whisker with the length-diameter ratio of more than 33, 15kg of poly (propylene glycol) -silane-poly (ethylene glycol) and 2kg of phthalic anhydride.
The preparation method of the additive comprises the following steps:
s1, continuously stirring magnesium sulfate whiskers at the temperature of 70 ℃, dropwise adding poly (propylene glycol) -silane-poly (ethylene glycol) in the stirring process, completely continuously stirring, cooling to room temperature, then dispersing the mixture and graphene oxide into N, N-dimethylformamide, stirring for 5 hours at the temperature of 70 ℃, cooling, centrifuging, and drying to obtain a prefabricated material;
s2, adding the prefabricated material into bisphenol A epoxy resin, decompressing and pumping, adding phthalic anhydride, uniformly mixing, defoaming, continuously adding montmorillonite and superfine zeolite powder, and stirring at room temperature to obtain the curing additive.
A soil solidifying agent comprises the following raw materials: 40kg of ordinary Portland cement, 20kg of fly ash, 15kg of mineral powder, 5kg of steel slag, 7kg of sodium silicate, 2kg of polycarboxylic acid polymer, 5kg of hydrophobic nano silicon oxide, 12kg of the additive, 3kg of sodium hexametaphosphate, 2kg of alkyl dimethyl benzyl ammonium chloride and 150kg of water.
The preparation method of the soil curing agent comprises the following steps: uniformly mixing ordinary Portland cement, fly ash, mineral powder, steel slag, sodium silicate, polycarboxylic acid polymer, hydrophobic nano silicon oxide and water to obtain premix; adding the additive, sodium hexametaphosphate and alkyl dimethyl benzyl ammonium chloride into the premix, stirring, and curing for 4 hours at 32 ℃ to obtain the soil curing agent.
Example 3
An additive for rapidly improving grouting strength of solidified soil, which comprises the following raw materials: 35kg of bisphenol A epoxy resin with the epoxy value of 0.45eq/100g, 1.3kg of graphene oxide, 4kg of montmorillonite, 2kg of superfine zeolite powder with the particle size of 10-50nm, 4kg of magnesium sulfate whisker with the length-diameter ratio of >33, 8kg of poly (propylene glycol) -silane-poly (ethylene glycol) and 1.7kg of phthalic anhydride.
The preparation method of the additive comprises the following steps:
s1, continuously stirring magnesium sulfate whiskers at the temperature of 64 ℃, dropwise adding poly (propylene glycol) -silane-poly (ethylene glycol) in the stirring process, completely continuously stirring, cooling to room temperature, then dispersing the mixture and graphene oxide into N, N-dimethylformamide, stirring for 3 hours at the temperature of 68 ℃, cooling, centrifuging, and drying to obtain a prefabricated material;
s2, adding the prefabricated material into bisphenol A epoxy resin, decompressing and pumping, adding phthalic anhydride, uniformly mixing, defoaming, continuously adding montmorillonite and superfine zeolite powder, and stirring at room temperature to obtain the curing additive.
A soil solidifying agent comprises the following raw materials: 35kg of ordinary Portland cement, 12kg of fly ash, 12kg of mineral powder, 2kg of steel slag, 5kg of sodium silicate, 1.3kg of polycarboxylic acid polymer, 4kg of hydrophobic nano silicon oxide, 6kg of the additive, 2.5kg of sodium hexametaphosphate, 1.3kg of alkyl dimethyl benzyl ammonium chloride and 130kg of water.
The preparation method of the soil curing agent comprises the following steps: uniformly mixing ordinary Portland cement, fly ash, mineral powder, steel slag, sodium silicate, polycarboxylic acid polymer, hydrophobic nano silicon oxide and water to obtain premix; adding the additive, sodium hexametaphosphate and alkyl dimethyl benzyl ammonium chloride into the premix, stirring, and curing for 3 hours at 26 ℃ to obtain the soil curing agent.
Example 4
An additive for rapidly improving grouting strength of solidified soil, which comprises the following raw materials: bisphenol A epoxy resin with the epoxy value of 0.51eq/100g, graphene oxide of 1.7kg, montmorillonite of 2kg, superfine zeolite powder with the particle size of 10-50nm of 4kg, magnesium sulfate whisker with the length-diameter ratio of >33 of 2kg, poly (propylene glycol) -silane-poly (ethylene glycol) of 12kg and phthalic anhydride of 1.3kg.
The preparation method of the additive comprises the following steps:
s1, continuously stirring magnesium sulfate whiskers at the temperature of 66 ℃, dropwise adding poly (propylene glycol) -silane-poly (ethylene glycol) in the stirring process, completely continuously stirring, cooling to room temperature, then dispersing the mixture and graphene oxide into N, N-dimethylformamide, stirring for 4 hours at the temperature of 62 ℃, cooling, centrifuging, and drying to obtain a prefabricated material;
s2, adding the prefabricated material into bisphenol A epoxy resin, decompressing and pumping, adding phthalic anhydride, uniformly mixing, defoaming, continuously adding montmorillonite and superfine zeolite powder, and stirring at room temperature to obtain the curing additive.
A soil solidifying agent comprises the following raw materials: 25kg of ordinary Portland cement, 18kg of fly ash, 8kg of mineral powder, 4kg of steel slag, 3kg of sodium silicate, 1.7kg of polycarboxylic acid polymer, 2kg of hydrophobic nano silicon oxide, 8kg of the additive, 1.5kg of sodium hexametaphosphate, 1.7kg of alkyl dimethyl benzyl ammonium chloride and 110kg of water.
The preparation method of the soil curing agent comprises the following steps: uniformly mixing ordinary Portland cement, fly ash, mineral powder, steel slag, sodium silicate, polycarboxylic acid polymer, hydrophobic nano silicon oxide and water to obtain premix; adding the additive, sodium hexametaphosphate and alkyl dimethyl benzyl ammonium chloride into the premix, stirring, and maintaining at 30 ℃ for 2 hours to obtain the soil curing agent.
Example 5
An additive for rapidly improving grouting strength of solidified soil, which comprises the following raw materials: 30kg of bisphenol A epoxy resin with the epoxy value of 0.48eq/100g, 1.5kg of graphene oxide, 3kg of montmorillonite, 3kg of superfine zeolite powder with the particle size of 10-50nm, 3kg of magnesium sulfate whisker with the length-diameter ratio of >33, 10kg of poly (propylene glycol) -silane-poly (ethylene glycol) and 1.5kg of phthalic anhydride.
The preparation method of the additive comprises the following steps:
s1, continuously stirring magnesium sulfate whiskers at 65 ℃, dropwise adding poly (propylene glycol) -silane-poly (ethylene glycol) in the stirring process, completely continuously stirring, cooling to room temperature, then dispersing the mixture and graphene oxide into N, N-dimethylformamide, stirring for 3.5 hours at 65 ℃, cooling, centrifuging, and drying to obtain a prefabricated material;
s2, adding the prefabricated material into bisphenol A epoxy resin, decompressing and pumping, adding phthalic anhydride, uniformly mixing, defoaming, continuously adding montmorillonite and superfine zeolite powder, and stirring at room temperature to obtain the curing additive.
A soil solidifying agent comprises the following raw materials: 30kg of ordinary Portland cement, 15kg of fly ash, 10kg of mineral powder, 3kg of steel slag, 4kg of sodium silicate, 1.5kg of polycarboxylic acid polymer, 3kg of hydrophobic nano silicon oxide, 7kg of the additive, 2kg of sodium hexametaphosphate, 1.5kg of alkyl dimethyl benzyl ammonium chloride and 120kg of water.
The preparation method of the soil curing agent comprises the following steps: uniformly mixing ordinary Portland cement, fly ash, mineral powder, steel slag, sodium silicate, polycarboxylic acid polymer, hydrophobic nano silicon oxide and water to obtain premix; adding the additive, sodium hexametaphosphate and alkyl dimethyl benzyl ammonium chloride into the premix, stirring, and curing at 28 ℃ for 2.5 hours to obtain the soil curing agent.
Comparative example 1
An additive for rapidly improving grouting strength of solidified soil, which comprises the following raw materials: 30kg of bisphenol A epoxy resin with the epoxy value of 0.48eq/100g, 3kg of montmorillonite, 3kg of superfine zeolite powder with the particle size of 10-50nm, 3kg of magnesium sulfate whisker with the length-diameter ratio of more than 33, 10kg of poly (propylene glycol) -silane-poly (ethylene glycol) and 1.5kg of phthalic anhydride.
The preparation method of the additive comprises the following steps:
i. continuously stirring magnesium sulfate whisker, wherein the stirring temperature is 65 ℃, dropwise adding poly (propylene glycol) -silane-poly (ethylene glycol) in the stirring process, completely continuously stirring, cooling to room temperature, dispersing into N, N-dimethylformamide, stirring for 3.5h at 65 ℃, cooling, centrifuging, and drying to obtain a prefabricated material;
ii. Adding the prefabricated material into bisphenol A epoxy resin, decompressing and pumping, adding phthalic anhydride, uniformly mixing, defoaming, continuously adding montmorillonite and superfine zeolite powder, and stirring at room temperature to obtain the curing additive.
A soil solidifying agent comprises the following raw materials: 30kg of ordinary Portland cement, 15kg of fly ash, 10kg of mineral powder, 3kg of steel slag, 4kg of sodium silicate, 1.5kg of polycarboxylic acid polymer, 3kg of hydrophobic nano silicon oxide, 7kg of the additive, 2kg of sodium hexametaphosphate, 1.5kg of alkyl dimethyl benzyl ammonium chloride and 120kg of water.
The preparation method of the soil curing agent comprises the following steps: uniformly mixing ordinary Portland cement, fly ash, mineral powder, steel slag, sodium silicate, polycarboxylic acid polymer, hydrophobic nano silicon oxide and water to obtain premix; adding the additive, sodium hexametaphosphate and alkyl dimethyl benzyl ammonium chloride into the premix, stirring, and curing at 28 ℃ for 2.5 hours to obtain the soil curing agent.
Comparative example 2
An additive for rapidly improving grouting strength of solidified soil, which comprises the following raw materials: 30kg of bisphenol A epoxy resin with the epoxy value of 0.48eq/100g, 1.5kg of graphene oxide, 3kg of montmorillonite, 3kg of superfine zeolite powder with the particle size of 10-50nm, 3kg of magnesium sulfate whisker with the length-diameter ratio of >33 and 1.5kg of phthalic anhydride.
The preparation method of the additive comprises the following steps:
i. dispersing magnesium sulfate whisker and graphene oxide into N, N-dimethylformamide, stirring for 3.5 hours at 65 ℃, cooling, centrifuging and drying to obtain a prefabricated material;
ii. Adding the prefabricated material into bisphenol A epoxy resin, decompressing and pumping, adding phthalic anhydride, uniformly mixing, defoaming, continuously adding montmorillonite and superfine zeolite powder, and stirring at room temperature to obtain the curing additive.
A soil solidifying agent comprises the following raw materials: 30kg of ordinary Portland cement, 15kg of fly ash, 10kg of mineral powder, 3kg of steel slag, 4kg of sodium silicate, 1.5kg of polycarboxylic acid polymer, 3kg of hydrophobic nano silicon oxide, 7kg of the additive, 2kg of sodium hexametaphosphate, 1.5kg of alkyl dimethyl benzyl ammonium chloride and 120kg of water.
The preparation method of the soil curing agent comprises the following steps: uniformly mixing ordinary Portland cement, fly ash, mineral powder, steel slag, sodium silicate, polycarboxylic acid polymer, hydrophobic nano silicon oxide and water to obtain premix; adding the additive, sodium hexametaphosphate and alkyl dimethyl benzyl ammonium chloride into the premix, stirring, and curing at 28 ℃ for 2.5 hours to obtain the soil curing agent.
The soil solidifying agent obtained in the example 5 and the comparative examples 1-2 has a mass ratio to soil of 1.5:10000 are mixed evenly, put into a plastic bag, sealed and maintained for 24 hours in a loose state, and then tested for liquid limit, plastic limit and plastic index.
| Example 5 | Comparative example 1 | Comparative example 2 | |
| Liquid limit | 45.8 | 43.9 | 43.3 |
| Plastic limit | 27.9 | 25.8 | 23.9 |
| Plasticity index | 17.9 | 18.1 | 19.4 |
As can be seen from the above table: the soil stabilizer obtained in example 5 was used to reduce the plasticity index most, which indicates that the soil stabilizer obtained in example 5 can effectively reduce the thickness of the combined water film, reduce the spacing of the soil particles, and enhance the bonding force between the soil particles.
Meanwhile, the state of the soil solidifying agent after being mixed with the soil is compared and found that: the soil solidifying agent obtained in the example 5 and the comparative example 1 has better fluidity and better workability than those in the comparative example 2. The inventors consider that: the hydrophilic end of poly (propylene glycol) -silane-poly (ethylene glycol) is combined with the magnesium sulfate whisker, and the hydrophobic end is combined with bisphenol A epoxy resin, so that the magnesium sulfate whisker has better dispersibility, the efficiency of treating soil by fluid is improved, the service life is prolonged, and the fluidity of the grouting process is not influenced.
The soil solidifying agent obtained in the example 5 and the comparative examples 1-2 has a mass ratio to soil of 1.5:10000 are mixed evenly, put into a plastic bag, then rolled and cured to obtain solidified soil with the compactness of 96 percent and 98 percent respectively, and the unconfined compressive strength of 7 days is measured.
As shown in fig. 1, the unconfined compressive strength of the solidified soil with the compactness of 98% of each group is obviously higher than that of the solidified soil with the compactness of 96%, which indicates that each group of soil solidifying agents has a solidifying effect on the soil, and the solidifying effect is more obvious as the compactness is increased.
Whereas the unconfined compressive strength of the solidified soil with the compactness of 98% in the group of example 5 reaches 1.89Mpa, which is superior to the other two groups, the solidification effect of the soil solidifying agent obtained in the example 5 is superior to that of the comparative examples 1 and 2. The inventors consider that: the bisphenol A epoxy resin and the poly (propylene glycol) -silane-poly (ethylene glycol) are compounded in the additive, so that the solidified soil is quickly solidified and forms a whole, meanwhile, the amphiphilicity of the additive can promote the inter-particle attraction to be increased, the overall thickness of soil particles and the solidified soil can be reduced, the surface of crystals newly generated by aggregation and condensation of clay particles is provided with hydroxyl groups, the bisphenol A epoxy resin is attracted to be adhered to the surface, the surface electrification of the soil particles is weakened, the soil and the components of the solidifying agent are mutually gathered, the solidified soil is more compact, and the mechanical strength is higher. Meanwhile, the graphene oxide contains active carboxyl groups, the graphene oxide is grafted on a magnesium sulfate structure under the action of poly (propylene glycol) -silane-poly (ethylene glycol), and the magnesium sulfate single crystal fiber structure and the two-dimensional lattice structure of the graphene oxide are cooperatively alternated in a matrix, so that the overall strength of the solidified soil is improved, and compared with the structure without the graphene oxide, the structure has an alternated and crosslinked network structure, and the system stability of the solidified soil is obviously enhanced.
The soil solidifying agent obtained in the example 5 and the comparative examples 1-2 has a mass ratio to soil of 1.5:10000 is used for curing the soil, and after curing for 25 days, the flexural test is carried out by referring to the test procedure of the flexural strength test in GB/T50081-2016 Standard for test method of mechanical Properties of common concrete, as shown in figure 2.
The 25d flexural strength of example 5 group was far superior to the comparative example, and the inventors considered: the bisphenol A epoxy resin and the poly (propylene glycol) -silane-poly (ethylene glycol) in the additive are compounded, so that the solidified soil is solidified rapidly and forms a whole, the inter-particle attractive force is increased, the total thickness of soil particles and the solidified soil can be reduced, the surface electrification of the soil particles is weakened, the soil and the components of the solidifying agent are mutually close, the solidified soil is more compact, and the mechanical strength is higher. Meanwhile, the graphene oxide contains active carboxyl groups, the active carboxyl groups are grafted on a magnesium sulfate structure under the action of poly (propylene glycol) -silane-poly (ethylene glycol), the magnesium sulfate single crystal fiber structure and the two-dimensional lattice structure of the graphene oxide are cooperatively inserted in a matrix, the overall strength of the solidified soil is improved, and the system stability of the solidified soil is obviously enhanced.
The foregoing is only a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art, who is within the scope of the present application, should make equivalent substitutions or modifications according to the technical scheme of the present application and the inventive concept thereof, and should be covered by the scope of the present application.
Claims (8)
1. The additive for rapidly improving the grouting strength of the solidified soil is characterized by comprising the following raw materials: bisphenol A epoxy resin, graphene oxide, montmorillonite, superfine zeolite powder, magnesium sulfate whisker, poly (propylene glycol) -silane-poly (ethylene glycol) and phthalic anhydride; bisphenol A epoxy resin, graphene oxide, montmorillonite, superfine zeolite powder, magnesium sulfate whisker, poly (propylene glycol) -silane-poly (ethylene glycol) and phthalic anhydride in a mass ratio of 20-40:1-2:1-5:1-5:1-5:5-15:1-2.
2. The additive for rapidly improving grouting strength of solidified soil according to claim 1, wherein the epoxy value of the bisphenol a epoxy resin is 0.42-0.54eq/100g.
3. The additive for rapidly improving grouting strength of solidified soil according to claim 1, wherein the particle size of the ultra-fine zeolite powder is 10-50nm.
4. An additive for rapidly increasing the grouting strength of solidified soil according to claim 1, wherein the aspect ratio of magnesium sulfate whisker is >33.
5. A method of preparing an additive according to any one of claims 1 to 4, comprising the steps of:
s1, continuously stirring magnesium sulfate whiskers at 60-70 ℃, dropwise adding poly (propylene glycol) -silane-poly (ethylene glycol) in the stirring process, completely continuously stirring, cooling to room temperature, then dispersing the mixture and graphene oxide into N, N-dimethylformamide, stirring for 2-5 hours at 60-70 ℃, cooling, centrifuging, and drying to obtain a prefabricated material;
s2, adding the prefabricated material into bisphenol A epoxy resin, decompressing and pumping, adding phthalic anhydride, uniformly mixing, defoaming, continuously adding montmorillonite and superfine zeolite powder, and stirring at room temperature to obtain the curing additive.
6. The soil curing agent is characterized by comprising the following raw materials in parts by mass: 20-40 parts of ordinary Portland cement, 10-20 parts of fly ash, 5-15 parts of mineral powder, 1-5 parts of steel slag, 2-7 parts of sodium silicate, 1-2 parts of polycarboxylic acid polymer, 1-5 parts of hydrophobic nano silicon oxide, 2-12 parts of the additive according to any one of claims 1-4, 1-3 parts of sodium hexametaphosphate, 1-2 parts of alkyl dimethyl benzyl ammonium chloride and 100-150 parts of water.
7. A method of preparing the soil stabilizer of claim 6, comprising the steps of: uniformly mixing ordinary Portland cement, fly ash, mineral powder, steel slag, sodium silicate, polycarboxylic acid polymer, hydrophobic nano silicon oxide and water to obtain premix; adding the additive, sodium hexametaphosphate and alkyl dimethyl benzyl ammonium chloride according to any one of claims 1-4 into the premix, stirring, and maintaining at 25-32 ℃ for 1-4h to obtain the soil curing agent.
8. A method of using the soil conditioner according to claim 6, wherein the soil conditioner according to claim 6 is applied to soil, and the mass ratio of the soil conditioner to the soil is 1-2:10000, mixing and curing.
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| CN202310794940.1A CN116854399A (en) | 2023-06-30 | 2023-06-30 | Additive for rapidly improving grouting strength of solidified soil and preparation method thereof |
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| CN202310794940.1A CN116854399A (en) | 2023-06-30 | 2023-06-30 | Additive for rapidly improving grouting strength of solidified soil and preparation method thereof |
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