CN116217137A - Low-carbon resource utilization type shield inert synchronous grouting material and preparation method thereof - Google Patents
Low-carbon resource utilization type shield inert synchronous grouting material and preparation method thereof Download PDFInfo
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- CN116217137A CN116217137A CN202211651222.0A CN202211651222A CN116217137A CN 116217137 A CN116217137 A CN 116217137A CN 202211651222 A CN202211651222 A CN 202211651222A CN 116217137 A CN116217137 A CN 116217137A
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- grouting material
- resource utilization
- synchronous grouting
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- 239000000463 material Substances 0.000 title claims abstract description 109
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 55
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 192
- 239000002893 slag Substances 0.000 claims abstract description 106
- 229910052742 iron Inorganic materials 0.000 claims abstract description 96
- 239000004576 sand Substances 0.000 claims abstract description 95
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000000843 powder Substances 0.000 claims abstract description 75
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 41
- 230000023556 desulfurization Effects 0.000 claims abstract description 41
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 40
- 239000003513 alkali Substances 0.000 claims abstract description 36
- 239000000654 additive Substances 0.000 claims abstract description 32
- 230000000996 additive effect Effects 0.000 claims abstract description 32
- 239000002699 waste material Substances 0.000 claims abstract description 32
- 239000004567 concrete Substances 0.000 claims abstract description 31
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229940080314 sodium bentonite Drugs 0.000 claims abstract description 24
- 229910000280 sodium bentonite Inorganic materials 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 99
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 96
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 51
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 48
- 229910021487 silica fume Inorganic materials 0.000 claims description 44
- 238000002156 mixing Methods 0.000 claims description 41
- 239000003795 chemical substances by application Substances 0.000 claims description 29
- 239000002131 composite material Substances 0.000 claims description 29
- 239000000203 mixture Substances 0.000 claims description 25
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 22
- 239000002253 acid Substances 0.000 claims description 14
- 150000002505 iron Chemical class 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 12
- 239000004480 active ingredient Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 2
- 238000003760 magnetic stirring Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 7
- 239000002910 solid waste Substances 0.000 abstract description 5
- 239000012190 activator Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 12
- 239000004115 Sodium Silicate Substances 0.000 description 10
- 239000004568 cement Substances 0.000 description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 10
- 229910052911 sodium silicate Inorganic materials 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 229910010272 inorganic material Inorganic materials 0.000 description 7
- 239000011147 inorganic material Substances 0.000 description 7
- 229920005646 polycarboxylate Polymers 0.000 description 6
- 239000008030 superplasticizer Substances 0.000 description 6
- 229920000876 geopolymer Polymers 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- PHIQPXBZDGYJOG-UHFFFAOYSA-N sodium silicate nonahydrate Chemical group O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-][Si]([O-])=O PHIQPXBZDGYJOG-UHFFFAOYSA-N 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
- C04B14/106—Kaolin
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a low-carbon resource utilization type shield inert synchronous grouting material, which comprises the following raw materials in percentage by weight: 13-20% of inert cementing material, 15.2-19.5% of water, 15-20% of iron tailing sand, 25-31% of river sand, 3-4% of waste concrete, 5-6% of sodium bentonite, 6-7% of molten iron desulfurization slag superfine powder, 3-4% of alkali excitant, 0.2-0.5% of water reducer, 1.5-2.5% of additive and 100% of total content of the raw materials. The low-carbon resource utilization type shield inert synchronous grouting material comprehensively utilizes molten iron desulfurization slag, iron tailings and waste concrete, and has the advantages of high utilization rate of solid waste resources, good mechanical property and good construction property.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of solid waste resources, and particularly relates to a low-carbon resource utilization type shield inert synchronous grouting material and a preparation method thereof.
Background
The shield method is a construction method commonly adopted in tunnel engineering, and when the shield method is used, a shield tail gap of about 5-15 cm exists between a prefabricated segment which is separated from the shield tail and a soil body, and synchronous grouting is required to be poured in the gap so as to avoid the problems of soil body settlement, segment water seepage and the like, and the stability of the whole tunnel structure is maintained. The shield grouting material is divided into an active grouting material and an inert grouting material according to whether cement is contained or not. Compared with the two, the active grouting material has relatively high mechanical property index and strong site adaptability, but relatively poor construction property and is easy to block the pipe; the inert grouting material has good construction property, is not easy to block a pipe, but has relatively low mechanical property index. In practical engineering, the active grouting material and the inert grouting material are applied, and relatively speaking, the active grouting material and the inert grouting material have better mechanical properties, so that the application is wider. However, cement production has high energy consumption characteristics and high consumption of primary resources, so that the consumption of the cement is reduced, and the cement is replaced by a substitute, so that the development of the shield inert grouting material which can overcome the resource waste and has good mechanical properties is an object in the industry.
In addition, in both the active grouting material and the inert grouting material, the sand is a main admixture and the dosage is large. The amount of building materials such as natural sand used in grouting materials, which need to consume primary resources, is increased sharply, so that the price is increased continuously, and the ecological environment is seriously damaged. The search for a technical method capable of replacing natural sand is also a current urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a low-carbon resource utilization type shield inert synchronous grouting material which comprehensively utilizes molten iron desulfurization slag, iron tailings and waste concrete, and has the advantages of high utilization rate of solid waste resources, good mechanical property and good construction property.
The invention adopts the following technical scheme: the low-carbon resource utilization type shield inert synchronous grouting material comprises the following raw materials in percentage by weight: 13-20% of inert cementing material, 15.2-19.5% of water, 15-20% of iron tailing sand, 25-31% of river sand, 3-4% of waste concrete, 5-6% of sodium bentonite, 6-7% of molten iron desulfurization slag superfine powder, 3-4% of alkali excitant, 0.2-0.5% of water reducer, 1.5-2.5% of additive and 100% of total content of the raw materials.
Further, the inert cementing material is a mixture of slag micropowder, metakaolin and silica fume, wherein the mass ratio of the slag micropowder, the fly ash and the silica fume is (8-11): (3-5): (2-4).
Further, the active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The mass content is 1.5-2.5%, and the particle size grade of the molten iron desulfurization slag superfine powder is 800 meshes.
Further, the grain size of the river sand is 0.2-0.5 mm, the grain size of the iron tailing sand is 0.2-0.5 mm, and the grain size of the waste concrete sand is 0.2-0.5 mm.
Further, the additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of silane coupling agent, 70% of acetone and 5% of water.
Further, the water reducer is a powdery polycarboxylate superplasticizer.
The invention also discloses a preparation method of the low-carbon resource utilization type shield inert synchronous grouting material, which comprises the following steps:
step one, under the condition of 130-150 ℃, slag micropowder, metakaolin and iron tailing sand are respectively and independently mixed with an additive silane coupling agent composite solution through magnetic stirring, and modified slag micropowder, modified metakaolin and modified iron tailing sand are respectively obtained;
step two, mixing the modified slag micropowder, the modified metakaolin and the silica fume at room temperature, and magnetically stirring at constant temperature to obtain an inert cementing material;
mixing inert cementing material powder, modified iron tailing sand, river sand, waste concrete, sodium bentonite, molten iron desulfurization slag superfine powder and powdery polycarboxylic acid high-efficiency water reducer at room temperature to obtain a powder mixture;
step four, mixing the alkali-activated agent with water at room temperature, and magnetically stirring at constant temperature to obtain an alkali-activated agent solution;
and fifthly, mixing the powder mixture in the step three with the alkali-exciting agent solution in the step four, and magnetically stirring at constant temperature to obtain the low-carbon resource utilization type shield inert synchronous grouting material.
The beneficial effects of the invention are as follows: 1, solid waste resources are adopted as main raw materials, the solid waste materials reach 20%, cement is not contained, the energy consumption is reduced, and the cost is saved; the prepared low-carbon resource utilization type shield inert synchronous grouting material has the characteristics of good mechanical property, high early strength and good construction property. 2. The molten iron desulfurization slag contains higher f-CaO and f-MgO, can be used as geopolymer with silicon and aluminum components contained in iron tailings and waste concrete through alkali excitation to perform geopolymer reaction, and the produced geopolymer gel can effectively fill the pores of the material, so that the compactness of the material is improved, and the mechanical property of the material is improved. 3. The iron tailings and the waste concrete can be used as fine aggregate to replace natural sand. 4. The silica fume, metakaolin, slag micropowder and iron tailing sand are all inorganic materials, and have good compatibility, so that the silica fume can be combined with the metakaolin, slag micropowder and iron tailing sand to form an inert cementing material, and the silica fume can be dispersed into the structure of the inert cementing material to form a dense-structure cementing body with good interface compatibility.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention discloses a low-carbon resource utilization type shield inert synchronous grouting material, which comprises the following raw materials in percentage by weight: 13-20% of inert cementing material, 15.2-19.5% of water, 15-20% of iron tailing sand, 25-31% of river sand, 3-4% of waste concrete, 5-6% of sodium bentonite, 6-7% of molten iron desulfurization slag superfine powder, 3-4% of alkali excitant, 0.2-0.5% of water reducer, 1.5-2.5% of additive and 100% of total content of the raw materials.
Wherein: the inert cementing material is a mixture of slag micropowder, metakaolin and silica fume, wherein the mass ratio of the slag micropowder to the metakaolin to the silica fume is (8-11): (3-5): (2-4).
The slag micropowder is S95-grade granulated blast furnace slag micropowder, and the specific surface area of the slag micropowder is 370-400 m 2 The particle size grade is 400 meshes, the activity index of the metakaolin is more than or equal to 110, the particle size grade is 1250 meshes, and the specific surface area of the silica fume is 23700m 2 And/kg, particle size class 10000 mesh.
The fineness of the silica fume is 10000 meshes, and the silica fume has the characteristics of large specific surface area and good dispersibility. The silica fume, metakaolin, slag micropowder and iron tailing sand are all inorganic materials, and have good compatibility, so that the silica fume can be combined with the metakaolin, slag micropowder and iron tailing sand to form an inert cementing material, and the silica fume can be dispersed into the structure of the inert cementing material to form a dense-structure cementing body with good interface compatibility.
The metakaolin has higher content of aluminate, so that silicate gel can be formed with Ca element, iron tailing sand Si and Al element in slag micropowder and Si element in silica fume under alkaline excitation environment, and aluminosilicate early-strength gel can be formed. Thereby realizing the improvement of the integral mechanical property of the inert cementing material and simultaneously having good early strength.
The particle size of the iron tailing sand is in the interval of 0.2 mm-0.5 mm. On the one hand, the grain size of the iron tailing sand is 0.2-0.5 mm, the iron tailing sand has higher silicon dioxide content, and the grain size and the property of the iron tailing sand are similar to those of the medium sand, so that the iron tailing sand can replace sand to be used as fine aggregate. On the other hand, under the action of alkaline environment, the quartz body of the inactive silicon contained in the iron tailing sand is excited to generate a certain gel body, and the gap of the inert gel material is filled, so that the mechanical property is improved.
The grain size of the river sand is in the interval of 0.2 mm-0.5 mm.
The particle size of the waste concrete sand is within the interval of 0.2 mm-0.5 mm. The waste concrete particles have an aggregate effect, and the aggregate contains SiO 2 、Al 2 O 3 The aluminosilicate geopolymer gel mainly comprising-Si-O-Al-O-and having a space network structure is produced by the polymerization reaction of an alkali-activated agent, and is compositely coexistent with a silicate system produced by alkali activation of an inert cementing materialIn the matrix, the strength development of the material is synergistically promoted.
The active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The content is 1.5-2.5%, and the grain size grade is 800 meshes. The superfine powder of the molten iron desulfurization slag has the property of mineral powder after grinding because the superfine powder is different from a special process for producing steel slag; meanwhile, the superfine powder of the molten iron desulphurization slag contains a certain amount of sulfate, so that a proper amount of superfine powder of the molten iron desulphurization slag can form a sulphoaluminate gel system with metakaolin and silica fume, and the early strength of the grouting material is improved; meanwhile, f-CaO and f-MgO of the superfine powder of the molten iron desulfurization slag can undergo hydration reaction to form micro-expanded crystal hydrate ettringite, so that the shrinkage of the material can be compensated in a certain range, and the compactness of the material can be improved.
The alkali-activated agent is sodium silicate, and the sodium silicate is sodium silicate nonahydrate;
the additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of a silane coupling agent, 70% of acetone and 5% of water, wherein the silane coupling agent is KH-560. The water reducer is powdery polycarboxylic acid high-efficiency water reducer.
The silane coupling agent in the silane coupling agent composite solution has a silanyloxy group, and the functional group is promoted to be uniformly attached to the surfaces of inorganic materials such as metakaolin, slag micropowder, iron tailing sand and the like under the action of the dispersant acetone, so that on one hand, the dispersibility of the materials is improved, the specific surface area of hydration reaction of the modified inorganic materials and the action area between silica fume and the modified inorganic materials are increased, and the workability and the mechanical property of the inert cementing materials are improved. On the other hand, the surface property of the material can be improved, the surface of the modified inorganic material is promoted to have hydrophobicity, the thickness of a water film among particles is reduced in the hydration process of the silica fume and the modified inorganic material, the compactness of the hydration aggregate is improved, and the porosity of the inert cementing material is reduced, so that the compactness of the inert cementing material is improved.
The preparation method of the low-carbon resource utilization type shield inert synchronous grouting material comprises the following steps:
step one, respectively and independently mixing slag micropowder, metakaolin and iron tailing sand with an additive silane coupling agent composite solution by using a high-temperature magnetic stirrer at the temperature of 130-150 ℃, wherein the stirring speed is 150-180 r/min, and the stirring time is 15-30 min, so as to obtain modified slag micropowder, modified metakaolin and modified iron tailing sand.
And secondly, mixing the modified slag micropowder, the modified metakaolin and the silica fume by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 150-180 r/min and the stirring time is 10-30 min, so as to obtain the inert cementing material powder.
And thirdly, mixing the inert cementing material powder, the modified iron tailing sand, the river sand, the waste concrete, the sodium bentonite, the molten iron desulfurization slag superfine powder and the powdery polycarboxylic acid high-efficiency water reducer by using a constant temperature magnetic stirrer at room temperature, wherein the stirring speed is 150-180 r/min, and the stirring time is 10-20 min, so as to obtain a powder mixture.
And step four, mixing the alkali-activated agent with water by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 150-180 r/min and the stirring time is 20-30 min, so as to obtain an alkali-activated agent solution.
And fifthly, mixing the powder mixture prepared in the step three with the alkali excitation solution prepared in the step four by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 150-180 r/min, and the stirring time is 10-25 min, so as to obtain the low-carbon resource utilization type shield inert synchronous grouting material.
In the preparation method of the low-carbon resource utilization type shield inert synchronous grouting material, room temperature refers to the temperature of a test place, namely, no additional heating is needed.
Example 1
Taking 100g of a low-carbon resource utilization type shield inert synchronous grouting material as an example, the components and the mass ratio thereof are as follows: 8% of slag micropowder, 3% of metakaolin, 2% of silica fume, 15% of iron tailing sand, 31% of river sand, 4% of waste concrete, 5.2% of sodium bentonite, 7% of molten iron desulfurization slag micropowder, 19.5% of water, 3% of alkali activator, 0.3% of water reducer and 2% of additive.
Slag micropowder with 400 meshes and specific surface area of 380m 2 /kg. The metakaolin has 1250 meshes and an activity index of more than or equal to 110. 10000 mesh silica fume, specific surface area 23700m 2 /kg. The grain diameter of the river sand is in the interval of 0.2 mm-0.5 mm. The active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The content is about 2.2 percent, and the grain size grade of the superfine powder of the molten iron desulphurization slag is 800 meshes.
The additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of silane coupling agent, 70% of acetone and 5% of water, wherein the silane coupling agent is KH-560. The alkali-activated agent is sodium silicate. The water reducer is powdery polycarboxylic acid high-efficiency water reducer.
The preparation method of the low-carbon resource utilization type shield inert synchronous grouting material comprises the following steps:
step one, respectively mixing slag micropowder, metakaolin and an additive silane coupling agent composite solution by using a high-temperature magnetic stirrer at the temperature of 140 ℃, wherein the stirring speed is 150r/min, and the stirring time is 15min, so as to obtain modified slag micropowder and modified metakaolin.
And step two, mixing the modified slag micropowder, the modified metakaolin and the silica fume by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, and obtaining the inert cementing material powder.
And thirdly, mixing the inert cementing material powder, river sand, waste concrete, sodium bentonite, molten iron desulfurization slag superfine powder and powdery polycarboxylic acid high-efficiency water reducer by using a constant temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min and the stirring time is 15min, so as to obtain a powder mixture.
And step four, mixing the alkali-activated agent with water by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, so as to obtain an alkali-activated agent solution.
And fifthly, mixing the powder mixture prepared in the step three with the alkali-activator solution prepared in the step four by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min, and the stirring time is 25min, so as to obtain the low-carbon resource utilization type shield inert synchronous grouting material.
Example 2
The present embodiment differs from embodiment 1 in that the following list is omitted, and the details are the same.
Taking 100g of a low-carbon resource utilization type shield inert synchronous grouting material as an example, the components and the mass ratio thereof are as follows: 11% of slag micropowder, 3% of metakaolin, 2% of silica fume, 20% of iron tailing sand, 29% of river sand, 3% of waste concrete, 5.5% of sodium bentonite, 6% of molten iron desulfurization slag micropowder, 15.3% of water, 3.3% of alkali-activated agent, 0.4% of water reducer and 1.5% of additive.
The preparation method of the low-carbon resource utilization type shield inert synchronous grouting material in the embodiment is the same as that of the embodiment 1, the difference is reaction conditions in each step, different reaction conditions are listed, and the unlisted conditions are the same.
In the first step, the high-temperature magnetic stirrer is used for working at 130 ℃ for 20min.
In the second step, the stirring speed was 180r/min.
In the third step, the stirring speed is 150r/min and the stirring time is 15min, so as to obtain a powder mixture.
In the fourth step, the stirring speed was 150r/min and the stirring time was 20min.
In the fifth step, the stirring speed was 180r/min and the stirring time was 10min.
Example 3
The present embodiment differs from embodiment 1 in that the following list is omitted, and the details are the same. Taking 100g of low-carbon resource utilization type shield inert synchronous grouting material as an example, the components and the mass ratio thereof are as follows: 10% of slag micropowder, 5% of metakaolin, 3% of silica fume, 16% of iron tailing sand, 27% of river sand, 4% of waste concrete, 5% of sodium bentonite, 6.2% of molten iron desulfurization slag micropowder, 17.1% of water, 4% of alkali activator, 0.2% of water reducer and 2.5% of additive.
The preparation method of the low-carbon resource utilization type shield inert synchronous grouting material in the embodiment is the same as that of the embodiment 1, the difference is reaction conditions in each step, different reaction conditions are listed, and the unlisted conditions are the same.
In the first step, the high-temperature magnetic stirrer is used for working at 150 ℃, the stirring speed is 150r/min, and the stirring time is 25min.
In the second step, the stirring speed was 180r/min and the stirring time was 20min.
In the third step, the stirring speed is 150r/min and the stirring time is 20min, so as to obtain a powder mixture.
In the fourth step, the stirring speed was 160r/min and the stirring time was 30min.
In the fifth step, the stirring speed was 170r/min and the stirring time was 25min.
Example 4
The present embodiment differs from embodiment 1 in that the following list is omitted, and the details are the same.
Taking 100g of low-carbon resource utilization type shield inert synchronous grouting material as an example, the components and the mass ratio thereof are as follows: 10.6% of slag micropowder, 4.7% of metakaolin, 7% of silica fume, 18% of iron tailing sand, 25% of river sand, 3% of waste concrete, 6% of sodium bentonite, 6.5% of molten iron desulfurization slag micropowder, 15.2% of water, 3.8% of alkali excitant, 0.5% of water reducer and 2% of additive.
The preparation method of the low-carbon resource utilization type shield inert synchronous grouting material in the embodiment is the same as that of the embodiment 1, the difference is reaction conditions in each step, different reaction conditions are listed, and the unlisted conditions are the same.
In the first step, the high-temperature magnetic stirrer is used for working at 140 ℃, the stirring speed is 180r/min, and the stirring time is 20min.
In the second step, the stirring speed was 170r/min and the stirring time was 25min.
In the third step, the stirring speed is 150r/min and the stirring time is 20min, so as to obtain a powder mixture.
In the fourth step, the stirring speed was 180r/min and the stirring time was 25min.
In the fifth step, the stirring speed was 150r/min and the stirring time was 20min.
Comparative example 1
Taking 100g of product as an example, the shield inert synchronous grouting material comprises the following components in parts by mass: 10% of slag micropowder, 5% of metakaolin, 3% of silica fume, 44.7% of iron tailing sand, 5% of sodium bentonite, 6.2% of molten iron desulfurization slag micropowder, 17.1% of water, 4% of alkali-activator, 0.2% of water reducer and 2.5% of additive.
Slag micropowder with 400 meshes and specific surface area of 380m 2 /kg. The metakaolin has 1250 meshes and an activity index of more than or equal to 110.
10000 meshes of silica fume and a specific surface area of 23700m 2 /kg. The grain size of the iron tailing sand is in the interval of 0.2 mm-0.5 mm. The active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The content is about 2.2 percent, and the grain size grade of the superfine powder of the molten iron desulphurization slag is 800 meshes.
The additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of silane coupling agent, 70% of acetone and 5% of water, wherein the silane coupling agent is KH-560.
The alkali-activated agent is sodium silicate, which is sodium silicate nonahydrate produced by chemical engineering of the ridge. The water reducer is powdery polycarboxylic acid high-efficiency water reducer.
The preparation method of the shield inert synchronous grouting material comprises the following steps:
mixing slag micropowder, metakaolin, iron tailing sand and the additive silane coupling agent composite solution by using a high-temperature magnetic stirrer at 140 ℃ respectively, wherein the stirring speed is 150r/min, and the stirring time is 15min, so as to obtain modified slag micropowder, modified metakaolin and modified iron tailing sand.
And secondly, mixing the modified slag micropowder, the modified metakaolin and the silica fume by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, so as to obtain the inert cementing material powder.
Thirdly, mixing the inert cementing material powder, the modified iron tailing sand, the sodium bentonite, the molten iron desulfurization slag superfine powder and the powdery polycarboxylic acid high-efficiency water reducer by using a constant temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min and the stirring time is 15min, so as to obtain a powder mixture.
Fourthly, mixing the alkali-activator with water by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, and obtaining the alkali-activator solution.
And fifthly, mixing the powder mixture prepared in the step 3 with the alkali-activated agent solution prepared in the step 4 by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min, and the stirring time is 25min, so as to obtain the low-carbon resource utilization type shield inert synchronous grouting material.
Comparative example 2
Taking 100g of product as an example, the shield inert synchronous grouting material comprises the following components in parts by mass: 10% of slag micropowder, 5% of metakaolin, 3% of silica fume, 47% of river sand, 5% of sodium bentonite, 6.2% of molten iron desulfurization slag micropowder, 17.1% of water, 4% of alkali-activator, 0.2% of water reducer and 2.5% of additive.
Slag micropowder with 400 meshes and specific surface area of 380m 2 /kg. The metakaolin has 1250 meshes and an activity index of more than or equal to 110. 10000 mesh silica fume, specific surface area 23700m 2 /kg. The grain diameter of the river sand is in the interval of 0.2 mm-0.5 mm.
The active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The content is about 2.2 percent, and the grain size grade of the superfine powder of the molten iron desulphurization slag is 800 meshes.
The additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of a silane coupling agent, 70% of acetone and 5% of water, wherein the silane coupling agent is KH-560. The alkali-activated agent is sodium silicate. The water reducer is powdery polycarboxylic acid high-efficiency water reducer.
Comparative example 3
Taking 100g of product as an example, the shield inert synchronous grouting material comprises the following components in parts by mass: 10% of slag micropowder, 5% of metakaolin, 3% of silica fume, 31% of river sand, 5% of sodium bentonite, 6.2% of molten iron desulfurization slag micropowder, 17.1% of water, 4% of alkali-activator, 0.2% of water reducer and 2.5% of additive.
Slag micropowder with 400 meshes and specific surface area of 380m 2 /kg. The metakaolin has 1250 meshes and an activity index of more than or equal to 110. 10000 mesh silica fume, specific surface area 23700m 2 /kg. The grain size of the iron tailing sand is in the interval of 0.2 mm-0.5 mm. The grain diameter of the river sand is in the interval of 0.2 mm-0.5 mm.
The active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The content is about 2.2 percent, and the grain size grade of the superfine powder of the molten iron desulphurization slag is 800 meshes.
The additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of a silane coupling agent, 70% of acetone and 5% of water, wherein the silane coupling agent is KH-560.
The alkali-activated agent is sodium silicate, and the water reducer is powdery polycarboxylate superplasticizer.
The preparation method of the shield inert synchronous grouting material comprises the following steps:
mixing slag micropowder, metakaolin, iron tailing sand and the additive silane coupling agent composite solution by using a high-temperature magnetic stirrer at 140 ℃ respectively, wherein the stirring speed is 150r/min, and the stirring time is 15min, so as to obtain modified slag micropowder, modified metakaolin and modified iron tailing sand.
And secondly, mixing the modified slag micropowder, the modified metakaolin and the silica fume by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, so as to obtain the inert cementing material powder.
Thirdly, mixing the inert cementing material powder, the modified iron tailing sand, the sodium bentonite, the molten iron desulfurization slag superfine powder and the powdery polycarboxylic acid high-efficiency water reducer by using a constant temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min and the stirring time is 15min, so as to obtain a powder mixture.
Fourthly, mixing the alkali-activator with water by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, and obtaining the alkali-activator solution.
And fifthly, mixing the powder mixture with the alkali-activated agent solution by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min, and the stirring time is 25min, so as to obtain the low-carbon resource utilization type shield inert synchronous grouting material.
Comparative example 4
Taking 100g of product as an example, the shield inert synchronous grouting material comprises the following components in parts by mass: 10% of slag micropowder, 5% of metakaolin, 3% of silica fume, 16% of iron tailing sand, 27% of river sand, 4% of waste concrete, 5% of sodium bentonite, 6.2% of molten iron desulfurization slag micropowder, 19.6% of water, 4% of alkali activator and 0.2% of water reducer.
Slag micropowder with 400 meshes and specific surface area of 380m 2 /kg. The metakaolin has 1250 meshes and an activity index of more than or equal to 110. 10000 mesh silica fume, specific surface area 23700m 2 /kg。
The grain size of the iron tailing sand is in the interval of 0.2 mm-0.5 mm. The grain diameter of the river sand is in the interval of 0.2 mm-0.5 mm. The particle size of the waste concrete is in the interval of 0.2 mm-0.5 mm.
The active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The content is about 2.2 percent, and the grain size grade of the superfine powder of the molten iron desulphurization slag is 800 meshes.
The alkali-activated agent is sodium silicate, and the water reducer is powdery polycarboxylate superplasticizer.
The preparation method of the shield inert synchronous grouting material comprises the following steps:
mixing slag micropowder, silica fume and metakaolin by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, so as to obtain inert cementing material powder.
And secondly, mixing inert cementing material powder, iron tailing sand, river sand, waste concrete, sodium bentonite, molten iron desulfurization slag superfine powder and powdery polycarboxylic acid high-efficiency water reducer by using a constant temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min, and the stirring time is 15min, so as to obtain a powder mixture.
Thirdly, mixing the alkali-exciting agent with water by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, so as to obtain an alkali-exciting agent solution.
And fourthly, mixing the powder mixture with the alkali-activator solution by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min, and the stirring time is 25min, so as to obtain the low-carbon resource utilization type shield inert synchronous grouting material.
Comparative example 5
Taking 100g of product as an example, the shield inert synchronous grouting material comprises the following components in parts by mass: 10% of slag micropowder, 5% of metakaolin, 3% of silica fume, 16% of iron tailing sand, 27% of river sand, 4% of waste concrete, 5% of sodium bentonite, 6.2% of molten iron desulfurization slag micropowder, 17.1% of water, 4% of alkali activator, 0.2% of water reducer and 2.5% of additive.
Slag micropowder with 400 meshes and specific surface area of 380m 2 /kg. The metakaolin has 1250 meshes and an activity index of more than or equal to 110. 10000 meshes of silica fume and a specific surface area of 23700m 2 /kg. The grain size of the iron tailing sand is in the interval of 0.2 mm-0.5 mm. The grain diameter of the river sand is in the interval of 0.2 mm-0.5 mm. The particle size of the waste concrete is in the interval of 0.2 mm-0.5 mm.
The active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The content is about 2.2 percent, and the grain size grade of the superfine powder of the molten iron desulphurization slag is 800 meshes.
The additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of silane coupling agent, 70% of acetone and 5% of water, wherein the silane coupling agent is KH-550. The alkali-activated agent is sodium silicate, and the water reducer is powdery polycarboxylate superplasticizer.
Comparative example 6
Taking 100g of product as an example, the shield inert synchronous grouting material comprises the following components in parts by mass: 10% of slag micropowder, 5% of metakaolin, 3% of silica fume, 16% of iron tailing sand, 27% of river sand, 4% of waste concrete, 5% of sodium bentonite, 6.2% of molten iron desulfurization slag micropowder, 17.1% of water, 4% of alkali activator, 0.2% of water reducer and 2.5% of additive.
Slag micropowder with 400 meshes and specific surface area of 380m 2 /kg. The metakaolin has 1250 meshes and an activity index of more than or equal to 110. 10000 meshes of silica fume and a specific surface area of 23700m 2 /kg. The grain size of the iron tailing sand is in the interval of 0.2 mm-0.5 mm. The grain diameter of the river sand is in the interval of 0.2 mm-0.5 mm. The particle size of the waste concrete is in the interval of 0.2 mm-0.5 mm.
The active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The content is about 2.2 percent, and the grain size grade of the superfine powder of the molten iron desulphurization slag is 800 meshes.
The additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of silane coupling agent, 70% of acetone and 5% of water, wherein the silane coupling agent is KH-570. The alkali-activated agent is sodium silicate, and the water reducer is powdery polycarboxylate superplasticizer.
The preparation method of the shield inert synchronous grouting material comprises the following steps:
mixing slag micropowder, metakaolin, iron tailing sand and the additive silane coupling agent composite solution by using a high-temperature magnetic stirrer at 140 ℃ respectively, wherein the stirring speed is 150r/min, and the stirring time is 15min, so as to obtain modified slag micropowder, modified metakaolin and modified iron tailing sand.
And secondly, mixing the modified slag micropowder, the modified metakaolin and the silica fume by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, so as to obtain the inert cementing material powder.
Thirdly, mixing the inert cementing material powder, the modified iron tailing sand, the river sand, the waste concrete, the sodium bentonite, the molten iron desulfurization slag superfine powder and the powdery polycarboxylic acid high-efficiency water reducer by using a constant temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min, and the stirring time is 15min, so as to obtain a powder mixture.
Fourthly, mixing the alkali-activator with water by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, and obtaining the alkali-activator solution.
And fifthly, mixing the powder mixture prepared in the step 3 with the alkali-activated agent solution prepared in the step 4 by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min, and the stirring time is 25min, so as to obtain the low-carbon resource utilization type shield inert synchronous grouting material.
Comparative example 7
Taking 100g of product as an example, the shield inert synchronous grouting material comprises the following components in parts by mass: 18% of Portland cement, 16% of iron tailing sand, 27% of river sand, 4% of waste concrete, 5% of sodium bentonite, 6.2% of molten iron desulfurization slag superfine powder, 17.1% of water, 4% of alkali-activator, 0.2% of water reducer and 2.5% of additive.
The particle size of the iron tailing sand is in the interval of 0.2 mm-0.5 mm. The grain diameter of the river sand is in the interval of 0.2 mm-0.5 mm. The particle size of the waste concrete is in the interval of 0.2 mm-0.5 mm. The silicate cement is conch PO42.5, and is produced by conch cement.
The active ingredient of the superfine powder of the molten iron desulfurization slag is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The content is about 2.2 percent, and the grain size grade of the superfine powder of the molten iron desulphurization slag is 800 meshes.
The additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of a silane coupling agent, 70% of acetone and 5% of water, wherein the silane coupling agent is KH-560. The alkali-activated agent is sodium silicate, and the water reducer is powdery polycarboxylate superplasticizer.
The preparation method of the shield inert synchronous grouting material comprises the following steps:
mixing the iron tailing sand with the additive silane coupling agent composite solution by using a high-temperature magnetic stirrer at the temperature of 140 ℃, wherein the stirring speed is 150r/min, and the stirring time is 15min, so as to obtain the modified iron tailing sand.
And secondly, mixing the modified iron tailing sand, river sand, waste concrete, sodium bentonite, silicate cement and powdery polycarboxylic acid high-efficiency water reducer by using a constant temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min and the stirring time is 15min, so as to obtain a powder mixture.
Thirdly, mixing the alkali-exciting agent with water by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 160r/min and the stirring time is 25min, so as to obtain an alkali-exciting agent solution.
And fourthly, mixing the prepared powder mixture with the prepared alkali-activated agent solution by using a constant-temperature magnetic stirrer at room temperature, wherein the stirring speed is 180r/min, and the stirring time is 25min, so as to obtain the low-carbon resource utilization type shield inert synchronous grouting material.
The performance of the low carbon resource utilization type shield inert synchronous grouting material prepared in each example and the shield inert synchronous grouting material prepared in each comparative example are tested according to T-CECS 563-2018, GB/T1761-1999 and JGJ/T70-2009, as shown in Table 1:
TABLE 1 Property of Low carbon resource utilization type shield inert synchronous grouting Material
As can be seen from the data in the table, the 3d compressive strength of examples 1 to 4 is 6.52 to 7.26MPa, the 28d compressive strength is 19.56 to 21.69MPa, the initial setting time is 3.5 to 6 hours, and the final setting time is 4.5 to 7 hours, which are all better than those of comparative examples 1 to 6, and are similar to those of comparative example 7 (containing cement), which indicates that the low-carbon resource utilization type shield inert synchronous grouting material prepared by the cement-free formula can reach the setting time close to that of active slurry (containing cement). In particular, the 3d compressive strength of examples 1 to 4 is much higher than that of comparative examples 1 to 6 and is similar to that of comparative example 7 (cement-containing) in that the low carbon resource utilization type shield inert synchronous grouting material prepared in the cement-free formulation can reach early strength close to that of the active slurry (cement-containing). According to the requirements of the T-CECS 563-2018 on the 3d compressive strength not less than 0.5 and the 28d compressive strength not less than 2.5, the embodiments 1-4 adopting the method of the invention are far higher than the related mechanical property requirements in the specification. The consistencies of examples 1-4 are 9.2-10.2 cm, and the consistencies of the slaked lime-based single-liquid synchronous grouting material in the T-CECS 563-2018 are 9-13 cm, so that the examples 1-4 adopting the method can meet the requirements and have good construction performance.
Claims (7)
1. The low-carbon resource utilization type shield inert synchronous grouting material is characterized by comprising the following raw materials in percentage by weight: 13-20% of inert cementing material, 15.2-19.5% of water, 15-20% of iron tailing sand, 25-31% of river sand, 3-4% of waste concrete, 5-6% of sodium bentonite, 6-7% of molten iron desulfurization slag superfine powder, 3-4% of alkali excitant, 0.2-0.5% of water reducer, 1.5-2.5% of additive and 100% of total content of the raw materials.
2. The low-carbon resource utilization type shield inert synchronous grouting material according to claim 1, wherein the inert cementing material is a mixture of slag micropowder, metakaolin and silica fume, and the mass ratio of the slag micropowder, the fly ash and the silica fume is (8-11): (3-5): (2-4).
3. The low-carbon resource utilization type shield inert synchronous grouting material as claimed in claim 1, wherein the active ingredient of the molten iron desulfurization slag superfine powder is SO 3 、CaO、SiO 2 And Al 2 O 3 Wherein SO 3 The mass containsThe amount is 1.5 to 2.5 percent, and the particle size grade of the molten iron desulfurization slag superfine powder is 800 meshes.
4. The low-carbon resource utilization type shield inert synchronous grouting material according to claim 1, wherein the grain size of river sand is 0.2-0.5 mm, the grain size of iron tailing sand is 0.2-0.5 mm, and the grain size of waste concrete sand is 0.2-0.5 mm.
5. The low-carbon resource utilization type shield inert synchronous grouting material as claimed in claim 1, wherein the additive is a silane coupling agent composite solution, and the silane coupling agent composite solution comprises the following components in percentage by mass: 25% of silane coupling agent, 70% of acetone and 5% of water.
6. The low-carbon resource utilization type shield inert synchronous grouting material according to claim 5, wherein the water reducer is a powdery polycarboxylic acid high water reducer.
7. The method for preparing the low-carbon resource utilization type shield inert synchronous grouting material according to any one of claims 1 to 6, which is characterized by comprising the following steps:
step one, under the condition of 130-150 ℃, slag micropowder, metakaolin and iron tailing sand are respectively and independently mixed with an additive silane coupling agent composite solution through magnetic stirring, and modified slag micropowder, modified metakaolin and modified iron tailing sand are respectively obtained;
step two, mixing the modified slag micropowder, the modified metakaolin and the silica fume at room temperature, and magnetically stirring at constant temperature to obtain an inert cementing material;
mixing inert cementing material powder, modified iron tailing sand, river sand, waste concrete, sodium bentonite, molten iron desulfurization slag superfine powder and powdery polycarboxylic acid high-efficiency water reducer at room temperature to obtain a powder mixture;
step four, mixing the alkali-activated agent with water at room temperature, and magnetically stirring at constant temperature to obtain an alkali-activated agent solution;
and fifthly, mixing the powder mixture in the step three with the alkali-exciting agent solution in the step four, and magnetically stirring at constant temperature to obtain the low-carbon resource utilization type shield inert synchronous grouting material.
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| CN109574558A (en) * | 2018-11-20 | 2019-04-05 | 东北大学秦皇岛分校 | One kind is based on iron tailings geo-polymer porous material and preparation method thereof |
| CN112851156A (en) * | 2021-01-11 | 2021-05-28 | 南京师范大学 | C25-grade alkali-activated silicon-aluminum all-solid waste concrete and preparation method thereof |
| CN113716898A (en) * | 2021-07-30 | 2021-11-30 | 东南大学 | Modified high-strength geopolymer cementing material and preparation method thereof |
| KR102453238B1 (en) * | 2021-12-16 | 2022-10-12 | 주식회사 송현산업 | Repair construction method for pavement on bridge-deck using ultra rapid hardening low carbon polymer concrete |
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| CN105272091A (en) * | 2015-09-25 | 2016-01-27 | 山东科技大学 | Geopolymer composite grouting material, and preparation method and use method thereof |
| CN107827422A (en) * | 2017-11-24 | 2018-03-23 | 罗斌 | High waterproof simultaneous grouting slurry for seabed shield tunnel |
| CN108751873A (en) * | 2018-08-13 | 2018-11-06 | 河南省建筑科学研究院有限公司 | The shield machine synchronous grouting material and preparation method thereof of fine powder is recycled containing building waste |
| CN109574558A (en) * | 2018-11-20 | 2019-04-05 | 东北大学秦皇岛分校 | One kind is based on iron tailings geo-polymer porous material and preparation method thereof |
| CN112851156A (en) * | 2021-01-11 | 2021-05-28 | 南京师范大学 | C25-grade alkali-activated silicon-aluminum all-solid waste concrete and preparation method thereof |
| CN113716898A (en) * | 2021-07-30 | 2021-11-30 | 东南大学 | Modified high-strength geopolymer cementing material and preparation method thereof |
| KR102453238B1 (en) * | 2021-12-16 | 2022-10-12 | 주식회사 송현산업 | Repair construction method for pavement on bridge-deck using ultra rapid hardening low carbon polymer concrete |
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