CN116119989A - Inert wall post-grouting material with good freeze-thawing resistance and preparation method thereof - Google Patents
Inert wall post-grouting material with good freeze-thawing resistance and preparation method thereof Download PDFInfo
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- CN116119989A CN116119989A CN202211651217.XA CN202211651217A CN116119989A CN 116119989 A CN116119989 A CN 116119989A CN 202211651217 A CN202211651217 A CN 202211651217A CN 116119989 A CN116119989 A CN 116119989A
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- complexing agent
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- grouting material
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- 239000000463 material Substances 0.000 title claims abstract description 86
- 238000010257 thawing Methods 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 225
- 239000002893 slag Substances 0.000 claims abstract description 147
- 239000000835 fiber Substances 0.000 claims abstract description 112
- 239000000843 powder Substances 0.000 claims abstract description 110
- 239000008139 complexing agent Substances 0.000 claims abstract description 109
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 91
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 89
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000004743 Polypropylene Substances 0.000 claims abstract description 59
- -1 polypropylene Polymers 0.000 claims abstract description 59
- 229920001155 polypropylene Polymers 0.000 claims abstract description 59
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 49
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 39
- 229910052742 iron Inorganic materials 0.000 claims abstract description 36
- 239000004576 sand Substances 0.000 claims abstract description 36
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 32
- 230000023556 desulfurization Effects 0.000 claims abstract description 32
- 239000010881 fly ash Substances 0.000 claims abstract description 31
- 239000002994 raw material Substances 0.000 claims abstract description 26
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 93
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 93
- 238000002156 mixing Methods 0.000 claims description 55
- 239000007788 liquid Substances 0.000 claims description 37
- 238000003756 stirring Methods 0.000 claims description 35
- 238000005507 spraying Methods 0.000 claims description 32
- 239000012190 activator Substances 0.000 claims description 28
- 238000005530 etching Methods 0.000 claims description 21
- 239000004570 mortar (masonry) Substances 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 16
- 239000013043 chemical agent Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 10
- 235000019353 potassium silicate Nutrition 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 9
- 238000007667 floating Methods 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 239000004480 active ingredient Substances 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 239000000243 solution Substances 0.000 description 85
- 239000000047 product Substances 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 21
- 239000002002 slurry Substances 0.000 description 16
- 239000002131 composite material Substances 0.000 description 13
- 229910004298 SiO 2 Inorganic materials 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/04—Alkali metal or ammonium silicate cements ; Alkyl silicate cements; Silica sol cements; Soluble silicate 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses an inert post-wall grouting material with good freeze-thawing resistance, which comprises the following raw materials in parts by weight: 6.5 to 8 percent of superfine powder of molten iron desulfurization slag; 0.3 to 0.4 percent of water reducer; 3.5 to 5 percent of modified alkaline excitant; 45% -49% of river sand; 20% -23% of water; 0.1 to 0.2 percent of modified polypropylene fiber; 0.3 to 0.4 percent of alkaline functional complexing agent; 14% -16% of nano silicon dioxide modified slag micropowder; 3% -4% of fly ash; 1 to 2 percent of silica fume; the total content of the raw materials is 100 percent. The inert wall post-grouting material has good freeze-thawing resistance, short setting time and good compressive strength.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of solid waste resources, and particularly relates to an inert post-wall grouting material with good freeze-thawing resistance and a preparation method thereof.
Background
In tunnel engineering construction, construction problems such as soil body subsidence, duct piece infiltration also appear correspondingly, in order to keep the stability of whole tunnel structure, the requirement to tunnel engineering grouting material is also higher and higher. The synchronous grouting material is mainly divided into active slurry containing cement and inert slurry containing no cement, the active slurry has high cost due to large cement mixing amount, and the inert slurry has low cost and good workability. However, the inert grouting material has the defects of poor freezing resistance, poor environmental applicability and the like, and can generate larger mass loss under the freeze-thawing cycle to the tunnel engineering in the season frozen area, especially at the tunnel portal side, so that the strength is reduced and the stability of the tunnel structure is adversely affected.
The fiber is added into the grouting material, so that the crack resistance of the grouting material can be improved, the mass loss rate of the grouting material in the freeze thawing process can be reduced to a certain extent, and the freeze thawing resistance of the grouting material is improved, wherein the core is the problem of effective bonding between the grouting material and the fiber. The fiber surface etching method can effectively strengthen the bonding between the fiber and the grouting material, and the grouting material doped with the modified fiber has the characteristics of good mechanical property and strong environment adaptability. At present, most chemical reagents for carrying out etching modification on fibers are acidic, but the acidic chemical reagents have the defects of reducing the mechanical property of grouting materials and corroding and damaging the environment, for example, sulfate radicals existing on the surfaces of fibers etched by sulfuric acid can react with metal cations to form excessive and stable sulfate radicals, which are harmful to animals, plants and the environment, and the acidic environment can limit the hydration reaction of inert grouting materials, so that the early-stage and later-stage strength reduction of the materials is unfavorable for construction. From the aspect of etching methods, most of the conventional methods for etching fibers are soaking methods, and because the gravity action among the fibers can be overlapped, chemical agents cannot fully contact the surfaces of the fibers, the etching effect of the fibers is affected, the engineering application target of the modified fibers cannot be fully realized, and the engineering application of the fibers is limited.
Disclosure of Invention
The invention aims to provide an inert wall post-grouting material with good freeze-thawing resistance, and a preparation method thereof.
The invention adopts the following technical scheme: an inert wall post-grouting material with good freeze-thawing resistance comprises the following raw materials in parts by weight: 6.5 to 8 percent of superfine powder of molten iron desulfurization slag; 0.3 to 0.4 percent of water reducer; 3.5 to 5 percent of modified alkaline excitant; 45% -49% of river sand; 20% -23% of water; 0.1 to 0.2 percent of modified polypropylene fiber; 0.3 to 0.4 percent of alkaline functional complexing agent; 14% -16% of nano silicon dioxide modified slag micropowder; 3% -4% of fly ash; 1 to 2 percent of silica fume; the total content of the raw materials is 100 percent.
Further, the material consists of the following raw materials in parts by weight: 8% of molten iron desulfurization slag ultrafine powder; 0.4% of water reducer; 5% of modified alkaline activator; 46% of river sand; 20% of water; 0.2% of modified polypropylene fiber; 0.4% of an alkaline functional complexing agent; 15.5 percent of nano silicon dioxide modified slag micro powder; 3.5 to 4 percent of fly ash; silica fume 1% to 5%; the total content of the raw materials is 100 percent.
Further, in the molten iron desulphurization slag ultrafine powder, the mass content of the active ingredients is CaO51.34 percent and SiO 2 15.32％、Al 2 O 3 5.47％、SO 3 1.98% and a specific surface area of 891m 2 /kg。
Further, the modified polypropylene fiber: is prepared from polypropylene fibres through etching by alkaline functional complexing agent solution.
Further, the alkaline functional complexing agent solution is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the mass ratio of the potassium hydroxide to the sodium hydroxide is (1-2): 2-1.
Further, the modified alkaline activator is a mixed activator of water glass solution with the purity of 95 percent and the modulus of 1.0-2.25 and alkaline functional complexing agent solution.
Further, the nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, and the ratio of the nano silicon dioxide to the slag micro powder is (2-4) (70-75).
Further, the water reducer is a powdery polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25% -30%.
Further, the polypropylene fiber has an equivalent diameter of 20 to 35 μm and a nominal length of 5 to 15mm.
The invention also discloses a preparation method of the inert post-wall grouting material with good freeze-thawing resistance, which comprises the following steps:
placing polypropylene fibers in a high-pressure ring spray engraving machine, and continuously blowing and floating the fibers at an air outlet in the machine body of the spray engraving machine;
spraying a high-concentration alkaline functional complexing agent solution prepared from an alkaline functional complexing agent and 20% of water on the blown fiber through a spraying opening in the barrel body, and continuously spraying for 1-2 h;
adding 80% by mass of water into the high-concentration alkaline functional complexing agent solution to obtain a low-concentration alkaline functional complexing agent solution, simultaneously blowing and floating the fiber sprayed with the high-concentration alkaline functional complexing agent solution, spraying the low-concentration alkaline functional complexing agent solution on the fiber sprayed with the high-concentration alkaline functional complexing agent solution, and continuously spraying for 20-30 min to obtain the modified polypropylene fiber;
mixing the modified polypropylene fiber with a low-concentration alkaline functional complexing agent solution to obtain a mixing solution A;
adding an alkaline excitant into the mixing liquid A, uniformly stirring, and standing to room temperature to obtain a mixing liquid B;
performing ultrasonic dispersion on the mixing liquid B, and adding 80% of the mixing liquid B into a mortar stirrer after dispersion;
adding molten iron desulfurization slag ultrafine powder, a water reducing agent, nano silicon dioxide modified slag micro powder, fly ash, silica fume and river sand into a mixing solution B in a mortar mixer, and uniformly stirring;
adding the rest 20% of the mixing liquid B, and continuously stirring to obtain the final product.
The beneficial effects of the invention are as follows: 1. through the modification of polypropylene fibers, the effective bonding between slurry calculus and fibers can be enhanced, the integrity of inert slurry calculus is improved, the freeze-thawing resistance of an inert grouting material is greatly improved, the problem that the inert slurry is not strong in temperature adaptability and easy to crack in cold environments in high latitude areas is solved, the application of the inert slurry is wider, and the inert slurry has good economic value. 2. The alkaline functional complexing agent can synergistically excite slag micropowder, fly ash and silica fume to achieve the purpose of cementing materials, so that the setting time of inert grouting slurry is shortened, the early and later strength is obviously improved, and the defects of poor mechanical property and overlong setting time of the inert slurry are overcome. Compared with an acidic etching reagent, the method for etching the fiber by using the alkaline functional complexing agent avoids the problems of harm to animals, plants and the environment and limitation of hydration reaction of the inert grouting material. 3. The problem that the etching degree of the polypropylene fibers is not easy to control in the soaking method is solved, so that the fibers can overcome the gravity action of materials by adopting the blowing-floating and spraying etching method, the fibers are easy to disperse, the etching agent can fully contact with the fibers, the surface of the fibers is accurately etched through the adjustment of related parameters, and the frost heaving resistance of grouting materials is effectively improved.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to an inert wall post-grouting material with good freeze-thawing resistance, which comprises the following raw materials in parts by weight: 6.5 to 8 percent of superfine powder of molten iron desulfurization slag; 0.3 to 0.4 percent of water reducer; 3.5 to 5 percent of modified alkaline excitant; 45% -49% of river sand; 20% -23% of water; 0.1 to 0.2 percent of modified polypropylene fiber; 0.3 to 0.4 percent of alkaline functional complexing agent; 14% -16% of nano silicon dioxide modified slag micropowder; 3% -4% of fly ash; 1 to 2 percent of silica fume; the total content of the raw materials is 100 percent.
Preferably, the material consists of the following raw materials in parts by weight: 8% of molten iron desulfurization slag ultrafine powder; 0.4% of water reducer; 5% of modified alkaline activator; 46% of river sand; 20% of water; 0.2% of modified polypropylene fiber; 0.4% of an alkaline functional complexing agent; 15.5 percent of nano silicon dioxide modified slag micro powder; 3.5 to 4 percent of fly ash; silica fume 1% to 5%; the total content of the raw materials is 100 percent.
The quality content of the active ingredients in the molten iron desulphurization slag ultrafine powder is CaO51.34 percent and SiO 2 15.32％、Al 2 O 3 5.47％、SO 3 1.98% and a specific surface area of 891m 2 /kg。
Modified polypropylene fiber: is prepared from polypropylene fibres through etching by alkaline functional complexing agent solution. Wherein the equivalent diameter of the polypropylene fiber is 20-35 mu m, and the nominal length is 5-15 mm.
The water reducer is a powdery polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25% -30%.
The modified alkaline activator is a mixed activator of water glass solution with the purity of 95 percent and the modulus of 1.0-2.25 and alkaline functional complexing agent solution.
The alkaline functional complexing agent solution is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the mass ratio of the potassium hydroxide to the sodium hydroxide is (1-2) to (2-1). The sodium hydroxide is analytically pure and the potassium hydroxide is analytically pure.
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, the ratio of the nano silicon dioxide to the slag micro powder is (2-4) (70-75), and the slag micro powder is S95-grade granulated blast furnace slag micro powder with a specific surface area of 400m 2 Per kg, wherein the nano silicon dioxide is hydrophilic nano silicon dioxide, the particle size range is 1-100 nm, and the specific surface area is 165000m 2 /kg～185000m 2 /kg。
The main component of the silica fume is SiO 2 (95.15%), caO (0.58%), specific surface area 23700m 2 /kg。
The invention also discloses a preparation method of the wall post-grouting material with good freeze-thawing resistance, which comprises the following steps:
and placing the polypropylene fibers in a high-pressure ring spray engraving machine, continuously blowing and floating the fibers along air outlets uniformly distributed in the barrel by utilizing the spray engraving machine, and spraying alkaline functional complexing agent solution through spray outlets uniformly distributed in the barrel. Spraying liquid for the first time to obtain a high-concentration alkaline functional complexing agent solution prepared from the alkaline functional complexing agent and 20% of water, spraying the high-concentration alkaline functional complexing agent solution for 1-2 h after the fiber in the equipment is blown and floated, and recycling the complexing agent solution through a collecting groove. And after stopping spraying, adding 80% of water into the high-concentration alkaline functional complexing agent solution to obtain a low-concentration alkaline functional complexing agent solution, spraying the low-concentration alkaline functional complexing agent solution on the surface of the fiber for 20-30 min through a spraying opening after blowing the fiber in the same way as the method to obtain the modified polypropylene fiber. After the completion, the modified polypropylene fiber and the alkaline functional complexing agent solution recovered from the collecting tank are taken out as a mixing solution A.
Adding an alkaline excitant into the mixing liquid A, uniformly stirring, and standing to room temperature to obtain a mixing liquid B;
performing ultrasonic dispersion on the mixing liquid B, and adding 80% of the mixing liquid B into a mortar stirrer after dispersion;
adding molten iron desulfurization slag ultrafine powder, a water reducing agent, nano silicon dioxide modified slag micro powder, fly ash, silica fume and river sand into a mixing solution B in a mortar mixer, and uniformly stirring;
adding the rest 20% of the mixing solution B, and continuously stirring for 60-90 sec at a slow speed to obtain the final product.
The alkaline functional complexing agent comprises sodium hydroxide and potassium hydroxide, and has the alkaline effect of synergistically exciting slag micropowder, fly ash and silica fume so as to achieve the purpose of cementing materials; meanwhile, the alkaline functional complexing agent has certain corrosiveness, can initially etch the surface of the polypropylene fiber in a gaseous state, increase the roughness of the surface of the fiber, improve the binding constraint effect of the fiber on a matrix in a freeze thawing environment, and effectively improve the freeze thawing resistance of the grouting material. By adopting the etching chemical agent and the etching method, the stacking of the fibers in the device is avoided, the fibers are fully dispersed, the fibers can be fully contacted with the device in the atomization environment of the etching chemical agent, the accuracy of the anti-cracking fiber etching is ensured, and the mechanical property of the material is improved. The method combines the addition of the molten iron desulfurization slag ultrafine powder, wherein alkaline oxide and alkaline residues on the surface of the fiber are subjected to chemical reaction together with amorphous silicon dioxide contained in the grouting material to generate alkali-silicate gel, and certain volume expansion is generated in and after the hardening of the slurry, so that the material structure is more compact, compared with the common grouting material, the freeze-thawing resistance of the grouting material can be improved, the defects of the existing material are overcome, the main defects of poor mechanical property and the like of the inert slurry are overcome on the basis of retaining the original advantages of the inert slurry, and the construction and long-term operation of tunnel engineering can be better satisfied.
Example 1
The embodiment discloses an inert wall post-grouting material with good freeze-thawing resistance, taking 100g of the inert wall post-grouting material as an example, which comprises the following raw materials by weight: 7g of molten iron desulfurization slag ultrafine powder, 0.3g of water reducer, 3.5g of modified alkaline excitant, 48g of river sand, 21g of water, 0.1g of modified polypropylene fiber, 0.4g of alkaline functional complexing agent, 3g of fly ash, 1.7g of silica fume and 15g of nano silicon dioxide modified slag micro powder.
The mass content of the active ingredients in the molten iron desulphurization slag ultrafine powder is CaO (51.34 percent) and SiO 2 (15.32％)、Fe 2 O 3 (12.64％)、Al 2 O 3 (5.47％)、SO 3 (1.98%) and a specific surface area of 891m 2 /kg。
The modified alkaline activator is a mixed activator of water glass solution with the purity of 95 percent and the modulus of 1.4 and alkaline functional complexing agent solution 4.
The water reducer is a powdery polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25% -30%.
The modified polypropylene fiber is obtained by etching an alkaline functional complexing agent solution, wherein the equivalent diameter of the polypropylene fiber is 20-35 mu m, and the nominal length is 5-15 mm.
The grain diameter of the river sand is in the range of 0.2 mm-0.5 mm.
The alkaline functional complexing agent is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the ratio of the potassium hydroxide to the sodium hydroxide is 1:1, the sodium hydroxide is analytically pure, and the potassium hydroxide is analytically pure.
The main component of the silica fume is SiO 2 (95.15%), caO (0.58%), specific surface area 23700m 2 /kg。
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, the ratio of the nano silicon dioxide to the slag micro powder is 2:75, the slag micro powder is S95-grade granulated blast furnace slag micro powder, and the specific surface area is 400m 2 Per kg, wherein the nano silicon dioxide is hydrophilic nano silicon dioxide, the particle size range is 1-100 nm, and the specific surface area is 165000m 2 /kg～185000m 2 /kg。
The preparation method of the inert wall post-grouting material with good freeze-thawing resistance comprises the following steps:
and placing the polypropylene fibers in a high-pressure ring spray engraving machine, continuously blowing and floating the fibers along air outlets uniformly distributed in the barrel by utilizing the spray engraving machine, and spraying alkaline functional complexing agent solution through spray outlets uniformly distributed in the barrel. Spraying liquid for the first time to obtain high-concentration alkaline functional complexing agent solution prepared from alkaline functional complexing agent and 20% water, spraying the high-concentration alkaline functional complexing agent solution for 1h after the fiber in the equipment is blown and floated, and recycling the complexing agent solution through a collecting tank. After stopping spraying, 80% of water is added into the high-concentration alkaline functional complexing agent solution to obtain a low-concentration alkaline functional complexing agent solution, and after the fiber is blown and floated by the method, the low-concentration alkaline functional complexing agent solution is sprayed on the surface of the fiber for 30min through a spraying opening. After the completion, taking out the modified polypropylene fiber and the alkaline functional complexing agent solution recovered by the collecting tank as a mixing solution A;
adding an alkaline excitant into the mixing liquid A, uniformly stirring, and standing to room temperature to obtain a mixing liquid B;
fully stirring nano silicon dioxide and slag micropowder for 10min to obtain modified slag micropowder;
performing ultrasonic dispersion on the mixing liquid B, and adding 80% of the mixing liquid B into a mortar stirrer after dispersion;
adding molten iron desulfurization slag ultrafine powder, a water reducing agent, nano silicon dioxide modified slag micro powder, fly ash, silica fume and river sand into the mixing liquid B in a mortar stirrer, stirring for 30sec at a slow speed, and uniformly mixing.
Adding the rest 20% of the mixing liquid B, and continuously stirring for 60sec at a slow speed.
The room temperature in the examples refers to the temperature of the environment in which the test was carried out, i.e. no additional heating by means of heating devices was required.
Example 2
This example discloses an inert post-wall grouting material with good freeze-thaw resistance and a preparation method, and the difference from example 1 is listed below, and the details not listed are the same.
Taking 100g of the inert wall post-grouting material as an example, the inert wall post-grouting material consists of the following raw materials in parts by weight: 6.5g of water desulfurization slag ultrafine powder, 0.3g of water reducer, 4.5g of modified alkaline activator, 47g of river sand, 22g of water, 0.2g of modified polypropylene fiber, 0.4g of alkaline functional complexing agent, 4g of fly ash, 1.1g of silica fume and 14g of nano silicon dioxide modified slag micro powder.
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, and the ratio of the nano silicon dioxide to the slag micro powder is 3:75.
The alkaline functional complexing agent is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the ratio of the potassium hydroxide to the sodium hydroxide is 1:2.
Example 3
This example discloses an inert post-wall grouting material with good freeze-thaw resistance and a preparation method, and the difference from example 1 is listed below, and the details not listed are the same.
Taking 100g of the inert wall post-grouting material as an example, the inert wall post-grouting material consists of the following raw materials in parts by weight: 7.3g of molten iron desulfurization slag ultrafine powder, 0.4g of water reducer, 4.8g of modified alkaline excitant, 45g of river sand, 20g of water, 0.2g of modified polypropylene fiber, 0.3g of alkaline functional complexing agent, 4g of fly ash, 2g of silica fume and 16g of nano silicon dioxide modified slag micropowder.
Example 4
This example discloses an inert post-wall grouting material with good freeze-thaw resistance and a preparation method, and the difference from example 1 is listed below, and the details not listed are the same.
Taking 100g of the inert wall post-grouting material as an example, the inert wall post-grouting material consists of the following raw materials in parts by weight: 6.8g of molten iron desulfurization slag ultrafine powder, 0.3g of water reducer, 3.9g of modified alkaline activator, 46g of river sand, 23g of water, 0.1g of modified polypropylene fiber, 0.3g of alkaline functional complexing agent, 3g of fly ash, 2g of silica fume and 14.5g of nano silicon dioxide modified slag micropowder.
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, and the ratio of the nano silicon dioxide to the slag micro powder is 4:75.
The alkaline functional complexing agent is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the ratio of the potassium hydroxide to the sodium hydroxide is 2:1.
Example 5
This example discloses an inert post-wall grouting material with good freeze-thaw resistance and a preparation method, and the difference from example 1 is listed below, and the details not listed are the same.
Taking 100g of the inert wall post-grouting material as an example, the inert wall post-grouting material consists of the following raw materials in parts by weight: 7.7g of molten iron desulfurization slag ultrafine powder, 0.4g of water reducer, 4.4g of modified alkaline activator, 47g of river sand, 21g of water, 0.1g of modified polypropylene fiber, 0.4g of alkaline functional complexing agent, 3.1g of fly ash, 1.5g of silica fume and 14.5g of nano silicon dioxide modified slag micro powder.
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, and the ratio of the nano silicon dioxide to the slag micro powder is 3:75.
The alkaline functional complexing agent is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the ratio of the potassium hydroxide to the sodium hydroxide is 2:1.
Example 6
This example discloses an inert post-wall grouting material with good freeze-thaw resistance and a preparation method, and the difference from example 1 is listed below, and the details not listed are the same.
Taking 100g of the inert wall post-grouting material as an example, the inert wall post-grouting material consists of the following raw materials in parts by weight: 8g of molten iron desulfurization slag ultrafine powder, 0.4g of water reducer, 5g of modified alkaline excitant, 46g of river sand, 20g of water, 0.2g of modified polypropylene fiber, 0.4g of alkaline functional complexing agent, 3.5g of fly ash, 1g of silica fume and 15.5g of nano silicon dioxide modified slag micro powder.
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, and the ratio of the nano silicon dioxide to the slag micro powder is 4:75.
The alkaline functional complexing agent is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the ratio of the potassium hydroxide to the sodium hydroxide is 1:2.
To verify the effect of a component in an inert post-wall grouting material with good freeze-thaw resistance, details are given in the respective comparative examples.
Comparative example 1
In this comparative example, taking the preparation of a post-wall grouting material as an example, the following raw materials by weight are included: 8g of molten iron desulfurization slag superfine powder, 0.4g of water reducer, 5g of alkali activator, 46g of river sand, 20.4g of water, 0.2g of polypropylene fiber, 3.5g of fly ash, 1g of silica fume and 15.5g of nano silica modified slag superfine powder.
The water reducer is a powdery polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25% -30%.
The grain diameter of the river sand is 0.2 mm-0.5 mm.
The alkali activator is water glass solution with the purity of 95% and the modulus of 1.0-2.25.
The equivalent diameter of the polypropylene fiber is 20-35 mu m, and the nominal length is 5-15 mm.
The main components of the superfine powder of the molten iron desulphurization slag are CaO (51.34 percent) and SiO 2 (15.32％)、Fe 2 O 3 (12.64％)、Al 2 O 3 (5.47％)、SO 3 (1.98%) and a specific surface area of 891m 2 /kg。
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, the ratio of the nano silicon dioxide to the slag micro powder is 4:75, and the slag micro powder is S95-grade granulated blast furnace slag micro powder with a specific surface area of 400m 2 The nano silicon dioxide is hydrophilic nano silicon dioxide, and the grain diameter range is 1About 100nm, a specific surface area of 165000m 2 /kg～185000m 2 /kg。
The main component of the silica fume is SiO 2 (95.15%), caO (0.58%), specific surface area 23700m 2 /kg。
The preparation method of the post-wall grouting material comprises the following steps:
fully stirring nano silicon dioxide and slag micropowder for 15min to obtain modified slag micropowder;
mixing an alkaline excitant with water, and adding 80% of mixing liquid into a mortar stirrer;
adding molten iron desulfurization slag ultrafine powder, polypropylene fiber, a water reducing agent, nano silicon dioxide modified slag micro powder, fly ash, silica fume and river sand into a mortar stirrer, and slowly stirring for 30sec;
adding the rest 20% of the mixing liquid, and continuously stirring for 75sec at a slow speed.
Comparative example 2
In this comparative example, taking the preparation of a post-wall grouting material as an example, the following raw materials by weight are included: 8g of molten iron desulfurization slag ultrafine powder, 0.4g of water reducer, 5g of alkali activator, 46g of river sand, 20.6g of water, 3.5g of fly ash, 1g of silica fume and 15.5g of nano silicon dioxide modified slag micro powder.
The water reducer is a powdery polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25% -30%.
The grain diameter of the river sand is 0.2 mm-0.5 mm.
The alkali activator is water glass solution with the purity of 95% and the modulus of 1.0-2.25.
The main components of the molten iron desulfurization slag ultrafine powder are CaO (51.34%), siO2 (15.32%), fe2O3 (12.64%), al 2 O 3 (5.47％)、SO 3 (1.98%) and a specific surface area of 891m2/kg.
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, the ratio of the nano silicon dioxide to the slag micro powder is 4:75, and the slag micro powder is S95-grade granulated blast furnace slag micro powder with a specific surface area of 400m 2 Kg, the nano silicon dioxide is hydrophilic nano IISilica with particle size of 1-100 nm and specific surface area of 165000m 2 /kg～185000m 2 /kg。
The main components of the silica fume are SiO2 (95.15%), caO (0.58%) and a specific surface area of 23700m 2 /kg。
The preparation method of the wall post-grouting material with good freeze-thawing resistance comprises the following steps:
fully stirring the nano silicon dioxide and slag micropowder for 15min to obtain nano silicon dioxide modified slag micropowder;
mixing an alkaline excitant with water, and adding 80% of mixing liquid into a mortar stirrer;
adding molten iron desulfurization slag ultrafine powder, a water reducing agent, nano silicon dioxide modified slag micro powder, fly ash, silica fume and river sand into a mortar stirrer, and slowly stirring for 30sec;
adding the rest 20% of the mixing liquid, and continuously stirring for 75sec at a slow speed.
Comparative example 3
In this comparative example, taking the preparation of a post-wall grouting material as an example, the following raw materials by weight are included: 8g of molten iron desulfurization slag ultrafine powder, 0.4g of water reducer, 5g of modified alkaline excitant, 46g of river sand, 20.2g of water, 0.4g of alkaline functional complexing agent, 3.5g of fly ash, 1g of silica fume and 15.5g of nano silicon dioxide modified slag micro powder.
The grain diameter of the river sand is 0.2 mm-0.5 mm.
The modified alkaline activator is a mixed activator of water glass solution with the purity of 95 percent and the modulus of 1.0.2.25 and alkaline functional complexing agent solution.
The water reducer is a powdery polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25% -30%.
The main components of the superfine powder of the molten iron desulphurization slag are CaO (51.34 percent) and SiO 2 (15.32％)、Fe 2 O 3 (12.64％)、Al 2 O 3 (5.47％)、SO 3 (1.98%) and a specific surface area of 891m 2 /kg。
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, and the nano silicon dioxide and the slag micro powder are mixedThe ratio of slag micropowder is 4:75, and the slag micropowder is S95-grade granulated blast furnace slag micropowder with specific surface area of 400m 2 Per kg, wherein the nano silicon dioxide is hydrophilic nano silicon dioxide, the particle size range is 1-100 nm, the specific surface area is 165000m 2/kg-185000 m 2 /kg。
The alkaline functional complexing agent is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the ratio of the potassium hydroxide to the sodium hydroxide is 1:1, the sodium hydroxide is analytically pure, and the potassium hydroxide is analytically pure.
The main component of the silica fume is SiO 2 (95.15%), caO (0.58%), specific surface area 23700m 2 /kg。
The preparation method of the wall post-grouting material with good freeze-thawing resistance comprises the following steps:
fully stirring nano silicon dioxide and slag micropowder for 15min to obtain modified slag micropowder;
adding an alkaline composite functional agent into an alkaline excitant, uniformly stirring, and standing to room temperature to obtain a mixing solution;
mixing the mixed solution into water, and adding 80% of the mixed solution into a mortar stirrer;
adding molten iron desulfurization slag ultrafine powder, a water reducing agent, nano silicon dioxide modified slag micro powder, fly ash, silica fume and river sand into a mortar stirrer, and slowly stirring for 30sec;
adding the rest 20% of the mixing solution B, and continuously stirring for 75sec at a slow speed.
Comparative example 4
In this comparative example, one example of preparing a post-wall grouting material comprises the following raw materials by weight: 8g of steel slag micropowder, 0.4g of water reducer, 5g of modified alkaline activator, 46g of river sand, 20g of water, 0.2g of modified polypropylene fiber, 0.4g of alkaline functional complexing agent, 3.5g of fly ash, 1g of silica fume and 15.5g of nano silicon dioxide modified slag micropowder.
The grain diameter of the river sand is 0.2 mm-0.5 mm.
The modified alkaline activator is a mixed activator of water glass solution with the purity of 95 percent and the modulus of 1.0-2.25 and alkaline functional complexing agent solution.
The water reducer is a powdery polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25% -30%.
The modified polypropylene fiber is obtained by etching an alkaline functional complexing agent solution, wherein the diameter of the polypropylene fiber is 32.7 mu m, and the tensile strength is 469MPa.
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, the ratio of the nano silicon dioxide to the slag micro powder is 4:75, the slag micro powder is S95-grade granulated blast furnace slag micro powder, the specific surface area is 400m < 2 >/kg, the nano silicon dioxide is hydrophilic nano silicon dioxide, the particle size range is 1-100 nm, and the specific surface area is 165000m < 2 >/kg-185000 m < 2 >/kg.
The main components of the steel slag micro powder are CaO (54.17 percent) and SiO 2 (17.79％)、Fe 2 O 3 (9.65%), mgO (6.23%), porosity 38.7%, water absorption 2.25%.
The alkaline functional complexing agent is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the ratio of the potassium hydroxide to the sodium hydroxide is 1:2, the sodium hydroxide is analytically pure, and the potassium hydroxide is analytically pure.
The main component of the silica fume is SiO 2 (95.15%), caO (0.58%), specific surface area 23700m 2 /kg。
The preparation method of the wall post-grouting material with good freeze-thawing resistance comprises the following steps:
and placing the polypropylene fibers in a high-pressure ring spray engraving machine, continuously blowing and floating the fibers along air outlets uniformly distributed in the barrel by utilizing the spray engraving machine, and spraying alkaline functional complexing agent solution through spray outlets uniformly distributed in the barrel. Spraying liquid for the first time to obtain high-concentration alkaline functional complexing agent solution prepared from alkaline functional complexing agent and 20% of water, spraying the high-concentration alkaline functional complexing agent solution for 2h after the fiber inside the equipment is blown and floated, and recycling the complexing agent solution through a collecting tank (similar to the following). After stopping spraying, 80% of water is added into the high-concentration alkaline functional complexing agent solution to obtain a low-concentration alkaline functional complexing agent solution, and after the fiber is blown and floated by the method, the low-concentration alkaline functional complexing agent solution is sprayed on the surface of the fiber for 25min through a spraying opening. After the completion, taking out the modified polypropylene fiber and the alkaline functional complexing agent solution recovered by the collecting tank as a mixing solution A;
fully stirring nano silicon dioxide and slag micropowder for 15min to obtain modified slag micropowder;
adding an alkaline excitant into the mixing liquid A, uniformly stirring, and standing to room temperature to obtain a mixing liquid B;
carrying out ultrasonic dispersion on the mixing liquid B, and adding 80% of the solution into a mortar stirrer after dispersion;
adding the steel slag micropowder, the water reducer, the nano silicon dioxide modified slag micropowder, the fly ash, the silica fume and the river sand into a mortar stirrer, and slowly stirring for 30 seconds;
adding the rest 20% of the mixing solution B, and continuously stirring for 75sec at a slow speed.
Comparative example 5
In this comparative example, taking the preparation of a post-wall grouting material as an example, the following raw materials by weight are included: 0.4g of water reducer, 5g of modified alkaline activator, 49g of river sand, 23g of water, 0.2g of modified polypropylene fiber, 0.4g of alkaline functional complexing agent, 4g of fly ash, 2g of silica fume and 16g of nano silica modified slag micropowder.
The grain diameter of the river sand is 0.2 mm-0.5 mm.
The modified alkaline activator is a mixed activator of water glass solution with the purity of 95 percent and the modulus of 1.0.2.25 and alkaline functional complexing agent solution.
The water reducer is a powdery polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25% -30%.
The modified polypropylene fiber is obtained by etching an alkaline functional complexing agent solution, wherein the diameter of the polypropylene fiber is 32.7 mu m, and the tensile strength is 469MPa.
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, the ratio of the nano silicon dioxide to the slag micro powder is 4:75, and the slag micro powder is S95-grade granulated blast furnace slag micro powder with a specific surface area of 400m 2 Per kg, the nano silicon dioxide is hydrophilic nano silicon dioxide, the grain diameter range is 1-100 nm, and the specific surfaceArea 165000m 2 /kg～185000m 2 /kg。
The alkaline functional complexing agent is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the ratio of the potassium hydroxide to the sodium hydroxide is 1:2, the sodium hydroxide is analytically pure, and the potassium hydroxide is analytically pure.
The main component of the silica fume is SiO 2 (95.15%), caO (0.58%), specific surface area 23700m 2 /kg。
The preparation method of the wall post-grouting material with good freeze-thawing resistance comprises the following steps:
and placing the polypropylene fibers in a high-pressure ring spray engraving machine, continuously blowing and floating the fibers along air outlets uniformly distributed in the barrel by utilizing the spray engraving machine, and spraying alkaline functional complexing agent solution through spray outlets uniformly distributed in the barrel. Spraying liquid for the first time to obtain high-concentration alkaline functional complexing agent solution prepared from alkaline functional complexing agent and 20% of water, spraying the high-concentration alkaline functional complexing agent solution for 2h after the fiber inside the equipment is blown and floated, and recycling the complexing agent solution through a collecting tank (similar to the following). After stopping spraying, 80% of water is added into the high-concentration alkaline functional complexing agent solution to obtain a low-concentration alkaline functional complexing agent solution, and after the fiber is blown and floated by the method, the low-concentration alkaline functional complexing agent solution is sprayed on the surface of the fiber for 25min through a spraying opening. After the completion, taking out the modified polypropylene fiber and the alkaline functional complexing agent solution recovered by the collecting tank as a mixing solution A;
fully stirring nano silicon dioxide and slag micropowder for 15min to obtain modified slag micropowder;
adding an alkaline excitant into the mixing liquid A, uniformly stirring, and standing to room temperature to obtain a mixing liquid B;
carrying out ultrasonic dispersion on the mixing liquid B, and adding 80% of the solution into a mortar stirrer after dispersion;
adding the water reducer, the nano silicon dioxide modified slag micropowder, the fly ash, the silica fume and the river sand into a mortar stirrer, and slowly stirring for 30sec;
adding the rest 20% of the mixing solution B, and continuously stirring for 75sec at a slow speed.
Comparative example 6
In this comparative example, taking the preparation of a post-wall grouting material as an example, the following raw materials by weight are included: 8g of molten iron desulfurization slag ultrafine powder, 0.4g of water reducer, 5g of modified alkaline excitant, 46g of river sand, 20g of water, 0.2g of modified polypropylene fiber, 0.4g of alkaline functional complexing agent, 3.5g of fly ash, 1g of silica fume and 15.5g of nano silicon dioxide modified slag micro powder.
The grain diameter of the river sand is 0.2 mm-0.5 mm.
The modified alkaline activator is a mixed activator of water glass solution with the purity of 95 percent and the modulus of 1.0.2.25 and alkaline functional complexing agent solution.
The water reducer is a powdery polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25% -30%.
The modified polypropylene fiber is obtained by etching an alkaline functional complexing agent solution, wherein the diameter of the polypropylene fiber is 32.7 mu m, and the tensile strength is 469MPa.
The main components of the molten iron desulfurization slag ultrafine powder are CaO (51.34%), siO2 (15.32%) and Fe 2 O 3 (12.64％)、Al2O3(5.47％)、SO 3 (1.98%) and a specific surface area of 891m 2 /kg。
The slag micropowder is S95-grade granulated blast furnace slag micropowder with specific surface area of 400m 2 /kg。
The main components of the silica fume are SiO2 (95.15%), caO (0.58%) and a specific surface area of 23700m2/kg.
The nano silicon dioxide modified slag micro powder is a mixture of nano silicon dioxide and slag micro powder, the ratio of the nano silicon dioxide to the slag micro powder is 4:75, and the slag micro powder is S95-grade granulated blast furnace slag micro powder with a specific surface area of 400m 2 Per kg, wherein the nano silicon dioxide is hydrophilic nano silicon dioxide, the particle size range is 1-100 nm, and the specific surface area is 165000m 2 /kg～185000m 2 /kg。
The alkaline composite functional agent is a composite chemical agent of sodium hydroxide and potassium hydroxide, wherein the ratio of the potassium hydroxide to the sodium hydroxide is 1:2, the sodium hydroxide is analytically pure, and the potassium hydroxide is analytically pure.
The preparation method of the wall post-grouting material with good freeze-thawing resistance comprises the following steps:
preparing an alkaline functional complexing agent and 20% of water into a high-concentration alkaline functional complexing agent solution, ultrasonically dispersing polypropylene fibers, and then soaking the polypropylene fibers in the high-concentration alkaline functional complexing agent solution for 2 hours for modification to obtain primary modified polypropylene fibers;
adding the rest 80% of water into the high-concentration alkaline functional complexing agent solution to dilute to obtain a low-concentration alkaline functional complexing agent solution, and soaking the primary modified polypropylene fibers in the low-concentration alkaline functional complexing agent solution for 25min to obtain a mixed solution A of the secondary modified polypropylene fibers and the alkaline functional complexing agent solution;
adding an alkaline excitant into the mixing liquid A, uniformly stirring, and standing to room temperature to obtain a mixing liquid B;
fully stirring nano silicon dioxide and slag micropowder for 15min to obtain modified slag micropowder;
carrying out ultrasonic dispersion on the mixing liquid B, and adding 80% of the solution into a mortar stirrer after dispersion;
adding molten iron desulfurization slag ultrafine powder, a water reducing agent, nano silicon dioxide modified slag micro powder, fly ash, silica fume and river sand into a mortar stirrer, and slowly stirring for 30sec;
adding the rest 20% of the mixing solution B, and continuously stirring for 75sec at a slow speed.
The post-wall grouting materials prepared in each example and comparative example were tested with the technical requirements of "shield method tunnel synchronous grouting Material application technical Specification" T-CECS 563-2018.
TABLE 1 Properties of post-wall grouting Material
Comparing the performance of the product in example 6 with that of comparative example 1, it is known that the initial setting time of the product added with 0.4% of alkaline functional complexing agent is shortened by 14.5 hours compared with that of the product not added, and the product has the advantage of quick setting like active slurry, so that the slurry has certain early strength, and soil instability can be avoided to support the normal operation of tunnel construction; and compared with the product of unmodified fiber, the product added with 0.2 percent of modified fiber has the advantages that the average strength after 50 times of freeze thawing resistance is improved by 2.86MPa, and the freeze thawing loss rate is reduced by 5.42 percent.
Comparing the properties of the product of example 6 with those of comparative example 2, it is known that the 28d compressive strength of the product with 0.4% of the basic functional complexing agent is improved by 2.71MPa compared with the product without the complexing agent; and compared with a product without fiber, the product with 0.2 percent of modified fiber has the advantages that the average strength after 50 times of freeze thawing resistance is improved by 3.97MPa, and the freeze thawing loss rate is reduced by 9.91 percent.
Comparing the properties of the products of example 6 with those of comparative example 3, it was found that the average strength after 50 freeze thawing cycles was increased by 2.88MPa and the freeze thawing loss was reduced by 9.54% by comparing the products with 0.2% modified fiber with the products without fiber.
Comparing the product performance of example 6 with that of comparative example 4, it is known that the average value of the strength of the product obtained by replacing the molten iron desulfurization slag ultrafine powder with the steel slag micropowder after 50 times of freeze thawing resistance is reduced by 1.2MPa, the freeze thawing loss rate is increased by 3.37%, and the freeze thawing resistance is poor.
Comparing the product performance of example 6 with that of comparative example 5, it is known that the average strength of 50 times of freeze thawing resistance of the product doped with the molten iron desulfurization slag ultra-fine powder is improved by 1.57Mpa, the freeze thawing loss rate is reduced by 3.58%, and the product doped with the molten iron desulfurization slag ultra-fine powder has a remarkable effect on improving the freeze thawing resistance of the inert grouting material.
Comparing example 6 with the prior art product in comparative example 7, (according to Hu Zhenghao. Mechanical property test study of polymer grouting material in quaternary frozen region [ D ]. Zhengzhou university, 2019 ]) it is known that after 15 times of freezing and thawing, the minimum value of the strength loss rate of the polymer grouting material is 25.6%, and the strength loss rate of the product after 50 times of freezing and thawing is only about 6%, and the effect of the anti-freezing and thawing performance is far better than that of the product in comparative example 7.
Claims (10)
1. An inert post-wall grouting material with good freeze-thawing resistance is characterized by comprising the following raw materials in parts by weight: 6.5 to 8 percent of superfine powder of molten iron desulfurization slag; 0.3 to 0.4 percent of water reducer; 3.5 to 5 percent of modified alkaline excitant; 45% -49% of river sand; 20% -23% of water; 0.1 to 0.2 percent of modified polypropylene fiber; 0.3 to 0.4 percent of alkaline functional complexing agent; 14% -16% of nano silicon dioxide modified slag micropowder; 3% -4% of fly ash; 1 to 2 percent of silica fume; the total content of the raw materials is 100 percent.
2. An inert post-wall grouting material with good freeze-thaw resistance as claimed in claim 1, wherein the material consists of the following raw materials in weight content: 8% of molten iron desulfurization slag ultrafine powder; 0.4% of water reducer; 5% of modified alkaline activator; 46% of river sand; 20% of water; 0.2% of modified polypropylene fiber; 0.4% of an alkaline functional complexing agent; 15.5 percent of nano silicon dioxide modified slag micro powder; 3.5 to 4 percent of fly ash; silica fume 1% to 5%; the total content of the raw materials is 100 percent.
3. An inert post-wall grouting material with good freeze-thaw resistance as defined in claim 1 or 2, wherein the mass content of active ingredients in the molten iron desulfurization slag superfine powder is CaO 51-34%, siO 2 15.32％、Al 2 O 3 5.47％、SO 3 1.98% and a specific surface area of 891m 2 /kg。
4. An inert post-wall grouting material with good freeze-thaw resistance according to claim 3, wherein the modified polypropylene fiber: is prepared from polypropylene fibres through etching by alkaline functional complexing agent solution.
5. The post-grouting material with good freeze-thawing resistance according to claim 4, wherein the alkaline functional complexing agent solution is a compound chemical agent of sodium hydroxide and potassium hydroxide, and the mass ratio of the potassium hydroxide to the sodium hydroxide is (1-2) (2-1).
6. The inert post-wall grouting material with good freeze-thaw resistance according to claim 5, wherein the modified alkaline activator is a mixed activator of water glass solution with purity of 95% and modulus of 1.0-2.25 and alkaline functional complexing agent solution.
7. The inert post-wall grouting material with good freeze-thawing resistance according to claim 6, wherein the nano-silica modified slag micropowder is a mixture of nano-silica and slag micropowder, and the ratio of the nano-silica to the slag micropowder is (2-4) (70-75).
8. An inert post-wall grouting material with good freeze-thaw resistance as defined in claim 7, wherein the water reducer is a powdery polycarboxylic acid high-efficiency water reducer with a water reduction rate of 25% -30%.
9. An inert post-wall grouting material with good freeze-thaw resistance according to claim 8, wherein the equivalent diameter of the polypropylene fiber is 20-35 μm and the nominal length is 5-15 mm.
10. A method for preparing an inert post-wall grouting material with good freeze-thaw resistance according to any one of claims 1-9, wherein the preparation method comprises the following steps:
placing polypropylene fibers in a high-pressure ring spray engraving machine, and continuously blowing and floating the fibers at an air outlet in the machine body of the spray engraving machine;
spraying a high-concentration alkaline functional complexing agent solution prepared from an alkaline functional complexing agent and 20% of water on the blown fiber through a spraying opening in the barrel body, and continuously spraying for 1-2 h;
adding 80% of water into the high-concentration alkaline functional complexing agent solution to obtain a low-concentration alkaline functional complexing agent solution, simultaneously blowing and floating the fiber sprayed with the high-concentration alkaline functional complexing agent solution, spraying the low-concentration alkaline functional complexing agent solution on the fiber sprayed with the high-concentration alkaline functional complexing agent solution, and continuously spraying for 20-30 min to obtain the modified polypropylene fiber;
mixing the modified polypropylene fibers with a low-concentration alkaline functional complexing agent solution to obtain a mixing solution A;
adding the alkaline excitant into the mixing liquid A, uniformly stirring, and standing to room temperature to obtain a mixing liquid B;
performing ultrasonic dispersion on the mixing liquid B, and adding 80% of the mixing liquid B into a mortar stirrer after dispersion;
adding molten iron desulfurization slag ultrafine powder, a water reducing agent, nano silicon dioxide modified slag micro powder, fly ash, silica fume and river sand into a mixing solution B in a mortar mixer, and uniformly stirring;
adding the rest 20% of the mixing liquid B, and continuously stirring to obtain the final product.
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