CN118271057A - Weak broken surrounding rock reinforcing grouting material and preparation method thereof - Google Patents
Weak broken surrounding rock reinforcing grouting material and preparation method thereof Download PDFInfo
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- CN118271057A CN118271057A CN202410225422.2A CN202410225422A CN118271057A CN 118271057 A CN118271057 A CN 118271057A CN 202410225422 A CN202410225422 A CN 202410225422A CN 118271057 A CN118271057 A CN 118271057A
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- 239000000463 material Substances 0.000 title claims abstract description 87
- 239000011435 rock Substances 0.000 title claims abstract description 56
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000012948 isocyanate Substances 0.000 claims abstract description 51
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical group COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims abstract description 49
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 48
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 32
- 239000010440 gypsum Substances 0.000 claims abstract description 32
- 239000004088 foaming agent Substances 0.000 claims abstract description 31
- 239000003094 microcapsule Substances 0.000 claims abstract description 29
- 239000004568 cement Substances 0.000 claims abstract description 27
- 238000005187 foaming Methods 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 239000004005 microsphere Substances 0.000 claims abstract description 19
- 238000011049 filling Methods 0.000 claims abstract description 13
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 52
- 238000003756 stirring Methods 0.000 claims description 34
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 30
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- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 25
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- 238000001035 drying Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- 238000010025 steaming Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 16
- 239000002904 solvent Substances 0.000 claims description 8
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical group N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 7
- ZTCFKBWDKVMLMM-UHFFFAOYSA-N N=C=O.N=C=O.C=1C=CC=CC=1C(=O)C1=CC=CC=C1 Chemical group N=C=O.N=C=O.C=1C=CC=CC=1C(=O)C1=CC=CC=C1 ZTCFKBWDKVMLMM-UHFFFAOYSA-N 0.000 claims description 7
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- 238000000227 grinding Methods 0.000 claims description 6
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- 230000002787 reinforcement Effects 0.000 claims description 5
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- RUMACXVDVNRZJZ-UHFFFAOYSA-N 2-methylpropyl 2-methylprop-2-enoate Chemical group CC(C)COC(=O)C(C)=C RUMACXVDVNRZJZ-UHFFFAOYSA-N 0.000 description 2
- XOMPUFACNHSNPC-UHFFFAOYSA-N N=C=O.N=C=O.CC1=CC=CC=C1C Chemical group N=C=O.N=C=O.CC1=CC=CC=C1C XOMPUFACNHSNPC-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—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 calcium sulfate 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
- 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
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/125—Compounds containing one or more carbon-to-nitrogen double or triple bonds, e.g. imines
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/42—Pore formers
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2111/40—Porous or lightweight 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Architecture (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention provides a weak broken surrounding rock reinforcing grouting material and a preparation method thereof, wherein the weak broken surrounding rock reinforcing grouting material comprises a component A and a component B; the component A contains foaming microcapsule and sulphoaluminate cement clinker, the shell of the foaming microcapsule is methyl methacrylate hollow microsphere, and the core of the foaming microcapsule is foaming agent; the component B contains an isocyanate microcapsule and a limestone-gypsum mixture, the shell of the isocyanate microcapsule is methyl methacrylate hollow microsphere, and the core of the isocyanate microcapsule is isocyanate. The weak broken surrounding rock reinforcing grouting material is beneficial to enhancing the cohesiveness and filling water blocking performance of the grouting material, can realize expansion foaming, and actively presses a grouting goaf.
Description
Technical Field
The invention belongs to the technical field of grouting materials, and particularly relates to a weak broken surrounding rock reinforcing grouting material and a preparation method thereof.
Background
As the mine mining depth increases, in the engineering excavation, groundwater may penetrate through cracks, pores, or incomplete waterproof layers in the underground engineering structure, resulting in an increase in the water level inside the engineering. This increases the saturation of the soil, causing the soil to become soft and possibly causing liquefaction of the soil. Meanwhile, the infiltration of water can also cause corrosion and damage of structural materials, and the stability of underground support engineering is affected. The grouting plugging material can effectively solve the problem of underground water leakage.
The traditional plugging material is not suitable for complex cracks, cannot penetrate into the cracks, and cannot completely plug water leakage. Many traditional plugging materials have the problems of cracking, falling off and the like in the use process due to the material components and the process problems, and aging and damage can occur after a long use time. And the traditional plugging material contains a plurality of harmful substances, and the substances volatilize into the air to influence the environment and the human health.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a weak broken surrounding rock reinforcing grouting material and a preparation method thereof, which are used for solving or improving the problems of poor filling performance or poor repairing effect of the existing grouting material on cracks and poor treatment effect on the weak broken surrounding rock. The weak broken surrounding rock reinforcing grouting material has the characteristics of high foaming efficiency, high bonding strength, good water blocking performance, long operation time and the like, is suitable for rapid grouting reinforcing water blocking areas, and is particularly suitable for reinforcing weak broken surrounding rocks.
In order to achieve the above object, the present invention provides the following technical solutions: a weak broken surrounding rock reinforcing grouting material comprises a component A and a component B; the component A contains foaming microcapsule and sulphoaluminate cement clinker, the shell of the foaming microcapsule is methyl methacrylate hollow microsphere, and the core of the foaming microcapsule is foaming agent; the component B contains an isocyanate microcapsule and a limestone-gypsum mixture, the shell of the isocyanate microcapsule is methyl methacrylate hollow microsphere, and the core of the isocyanate microcapsule is isocyanate.
Preferably, the component A comprises the following components in parts by weight: 100 parts of sulphoaluminate cement clinker, 100-150 parts of water, 1-3 parts of foaming agent, 20-25 parts of methyl methacrylate, 0.8-1 part of surfactant and 0.12-0.15 part of initiator; the component B comprises the following components in parts by weight: 100-150 parts of water, 100 parts of lime gypsum mixture, 50-75 parts of isocyanate, 20-25 parts of methyl methacrylate, 0.8-1 part of surfactant and 0.12-0.15 part of initiator.
Preferably, the isocyanate is a benzophenone diisocyanate; the foaming agent is polyethylene glycol; the surfactant is AEO-15; the initiator is azobisisobutyronitrile.
Preferably, the mass ratio of lime to gypsum in the lime gypsum mixture is 1:7.
The invention also provides a preparation method of the weak broken surrounding rock reinforcing grouting material, which adopts the following technical scheme: the preparation method of the weak broken surrounding rock reinforcing grouting material comprises the following steps: (1) preparing a component A and a component B respectively; (2) Stirring and mixing the component A and the component B to obtain the weak broken surrounding rock reinforcing grouting material; in the step (1), the component A is obtained by dropwise dripping a foaming agent into a shell material emulsion, magnetically stirring for 30-60min while dripping, rotationally steaming the obtained mixed solution to obtain powder, drying the powder, grinding the powder until the powder can pass through a 200-mesh sieve, adding the sulphoaluminate cement clinker, and stirring and mixing with water; the component B is prepared by dropwise adding isocyanate into shell emulsion, magnetically stirring for 30-60min while dropwise adding, steaming the obtained mixed solution to obtain powder, drying the powder, grinding the powder to 200 mesh, adding the limestone-gypsum mixture, and stirring and mixing with water; the preparation of the shell emulsion comprises the following steps: and (3) performing ultrasonic emulsification on the solvent, the initiator, the surfactant and the methyl methacrylate in a sonic breaker to obtain the shell material emulsion.
Preferably, the ultrasonic frequency is 35kHz, the ultrasonic emulsification time is 40min, and the ultrasonic emulsification temperature is less than or equal to 80 ℃; the solvent is ethanol, and the addition amount of the solvent is 2 times of that of methyl methacrylate.
Preferably, in the step (2), the mixing and stirring time of the component A and the component B is 1-2min.
The invention also provides a grouting method of the weak broken surrounding rock reinforced grouting material, which adopts the following technical scheme: the grouting method of the weak broken surrounding rock reinforced grouting material comprises the following steps: and conveying the weak broken surrounding rock reinforcing grouting material to a filling grouting area by adopting a double-liquid grouting pump.
Preferably, the grouting pressure of the two-fluid grouting pump is greater than 5MPa.
The beneficial effects are that:
(1) The weak broken surrounding rock reinforcing grouting material disclosed by the invention is beneficial to respectively encapsulating isocyanate and a foaming agent in hollow microspheres prepared from methyl methacrylate, and is beneficial to enhancing the cohesiveness and filling water blocking performance of the grouting material.
(2) The weak broken surrounding rock reinforcing grouting material has the advantages of low cost, convenient preparation, high fluidity, easy transportation, capability of realizing expansion foaming and active pressure grouting goaf.
(3) The weak broken surrounding rock reinforcing grouting material adopts a two-component form, has long operation time, the initial setting time of 8-15min and the final setting time of less than 26min, and can be suitable for the field of rapid filling grouting; the material has the advantages of small density, light weight, flame retardance and wide application range, meets the requirements of mining grouting materials, and solves the problems of the existing materials.
(4) The weak broken surrounding rock reinforcing grouting material has the characteristics of high foaming efficiency, high bonding strength, good water blocking performance, long operation time and the like, is suitable for rapid grouting reinforcing water blocking areas, is particularly suitable for reinforcing weak broken surrounding rocks, and can solve the problem that the conventional grouting material is poor in treatment effect when used for the weak broken surrounding rocks.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
Fig. 1 is a working schematic diagram of a weak broken surrounding rock reinforcing grouting material according to an embodiment of the present invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
The present invention will be described in detail with reference to examples. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
Aiming at the problems that the filling performance of the existing grouting material for cracks is poor, the repairing effect is poor or the damage to health can be caused, the invention provides the weak broken surrounding rock reinforcing grouting material. The weak broken surrounding rock reinforcing grouting material comprises a component A and a component B, wherein the component A contains foaming microcapsules and sulphoaluminate cement clinker, the shells of the foaming microcapsules are methyl methacrylate hollow microspheres, and the cores of the foaming microcapsules are foaming agents; the component B contains a mixture of isocyanate microcapsules and lime gypsum, the shells of the isocyanate microcapsules are methyl methacrylate hollow microspheres, and the cores of the isocyanate microcapsules are isocyanate.
Referring to fig. 1, the foaming microcapsules and the shells in the isocyanate microcapsules in the grouting material for grouting water injection are methyl methacrylate hollow microspheres, the methyl methacrylate hollow microspheres have stable structure, and the components in the methyl methacrylate hollow microspheres are not released before grouting, so that the setting and hardening rate, the fluidity and the stability of the weak broken surrounding rock reinforced grouting material are not influenced. In the case of grouting, when the grouting pressure of the high-pressure grouting pump is greater than a set value (for example, greater than 5.0 MPa) after the slurry passes through the high-pressure grouting pump, the methyl methacrylate cenospheres as the shells are opened, releasing the isocyanate and the foaming agent inside. The released foaming agent can cause the grouting material to foam to generate pressure, and the grouting liquid fills tiny cracks and holes under the action of high pressure, so that the filling effect of the grouting material for grouting water injection on the cracks is improved; the released isocyanate reacts with the sulphoaluminate cement clinker, and after the isocyanate reacts with the sulphoaluminate cement clinker, the formed product can form a gelatinous polymer in the sulphoaluminate cement clinker, and the gelatinous polymer has good adhesive force and elasticity and certain toughness, so that the repairing effect of the grouting material for grouting water injection on cracks is ensured, and the water blocking effect is improved.
The grouting material for grouting water injection not only helps to increase the filling efficiency of slurry, but also helps to improve the plugging performance on cracks.
In a preferred embodiment of the weak broken surrounding rock reinforcing grouting material, the component A comprises the following components in parts by weight: 100 parts of sulphoaluminate cement clinker, 100-150 parts of water (for example, 100 parts, 110 parts, 120 parts, 130 parts, 140 parts or 150 parts), 1-3 parts of foaming agent (for example, 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts), 20-25 parts of methyl methacrylate (for example, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts or 25 parts), 0.8-1 part of surfactant (for example, 0.8 parts, 0.85 parts, 0.9 parts, 0.95 parts or 1 part) and 0.12-0.15 part of initiator (for example, 0.12 parts, 0.13 parts, 0.14 parts or 0.15 part); the component B comprises the following components in parts by weight: 100-150 parts (e.g., 100 parts, 110 parts, 120 parts, 130 parts, 140 parts, or 150 parts), 100 parts of gypsum lime mixture, 50-75 parts (e.g., 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, or 75 parts), 20-25 parts (e.g., 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, or 25 parts) of methyl methacrylate, 0.8-1 part (e.g., 0.8 parts, 0.85 parts, 0.9 parts, 0.95 parts, or 1 part) of surfactant, and 0.12-0.15 part (e.g., 0.12 parts, 0.13 parts, 0.14 parts, or 0.15 parts) of initiator. Wherein the lime gypsum mixture is obtained by mixing lime (Ca (OH) 2) and gypsum (CaSO 4); lime and gypsum can both effectively promote the hydration rate of the sulphoaluminate cement and the generation of AFt in hydration products.
In the preferred embodiment of the weak broken surrounding rock reinforcing grouting material, the mass ratio of the component A to the component B is 1:1.
In a preferred embodiment of the weak broken surrounding rock reinforcing grouting material, the isocyanate is benzophenone diisocyanate; the foaming agent is polyethylene glycol; the surfactant is AEO-15; the initiator is azobisisobutyronitrile.
In a preferred embodiment of the weak broken surrounding rock reinforcement grouting material of the invention, the mass ratio of lime to gypsum in the lime-gypsum mixture is 1:7. When the mass ratio of lime to gypsum in the lime-gypsum mixture is 1:7, the method can play a role in better promoting the hydration rate of the sulphoaluminate cement clinker and promoting the AFt generation in hydration products.
The invention also provides a preparation method of the weak broken surrounding rock reinforcing grouting material, which comprises the following steps: (1) preparing a component A and a component B respectively; (2) Stirring and mixing the component A and the component B to obtain a weak broken surrounding rock reinforced grouting material; in the step (1), the component A is obtained by dropwise adding a foaming agent into a shell emulsion, magnetically stirring for 30-60min (for example, 30min, 35min, 40min, 45min, 50min, 55min or 60 min) while dropwise adding, rotationally steaming the obtained mixed solution to obtain powder, drying the powder, grinding the powder until the powder can pass through a 200-mesh sieve, adding sulfoaluminate cement clinker, and stirring and mixing the powder with water; the component B is prepared by dropwise adding isocyanate into shell emulsion, magnetically stirring for 30-60min (for example, 30min, 35min, 40min, 45min, 50min, 55min or 60 min) while dropwise adding, steaming the obtained mixed solution to obtain powder, drying the powder, grinding the powder to a screen of 200 meshes, adding lime gypsum mixture, and stirring and mixing with water; the preparation of the shell emulsion comprises the following steps: and (3) performing ultrasonic emulsification on the solvent, the initiator, the surfactant and the methyl methacrylate in a sonic breaker to obtain the shell material emulsion.
Preferably, in the process of preparing the shell emulsion, the ultrasonic frequency is 35kHz, the ultrasonic treatment time is 40min, the temperature is less than or equal to 80 ℃,
Preferably, the solvent is ethanol, the mass of which is 2 times that of methyl methacrylate.
Wherein, isocyanate can not react with water, so that the isocyanate microcapsule is needed to be prepared before grouting construction; and wrapping isocyanate inside the methyl methacrylate hollow microsphere. Methyl methacrylate can be polymerized to form hollow microspheres, and the hollow microspheres belong to high-pressure release microspheres and have the characteristics of light weight, insulation, sound absorption, heat insulation and the like.
In a preferred embodiment of the method for preparing the weak broken surrounding rock reinforced grouting material, in the step (2), the time for mixing and stirring the component A and the component B is 1-2min (for example, 1min, 1.2min, 1.4min, 1.6min, 1.8min or 2 min).
The invention also provides a grouting method of the weak broken surrounding rock reinforcing grouting material, which comprises the following steps: and (3) conveying the weak broken surrounding rock reinforcing grouting material to a filling grouting area by adopting a double-liquid grouting pump.
In a preferred embodiment of the grouting method of the grouting material for grouting water injection of the present invention, the grouting pressure of the dual-fluid grouting pump is greater than 5MPa. The grouting pressure of the two-fluid grouting pump is higher than 5MPa, so that the shells (the methyl methacrylate hollow microspheres) in the foaming microcapsules and the isocyanate microcapsules are opened under the grouting pressure, and the foaming agent and the isocyanate are released, so that the foaming agent and the isocyanate play a role.
The following describes the weak broken surrounding rock reinforcing grouting material, the preparation method and the application thereof in detail through specific examples.
In the following examples: the sulphoaluminate cement clinker is a thousand-industry cement Limited liability company in Henan province; the foaming agent is polyethylene glycol reagent, which is produced by MeRCK technology company; AEO-15 is adopted as the surfactant; the initiator adopts azodiisobutyronitrile; the isocyanate adopts diphenyl ketone diisocyanate;
Lime (Ca (OH) 2) and gypsum (CaSO 4) were purchased from Henan Dacromet New Material Co., ltd, respectively, in the lime gypsum mixture.
Example 1
The weak broken surrounding rock reinforcing grouting material comprises the following raw materials in parts by weight:
and (3) a component A: 100 parts of sulphoaluminate cement clinker, 150 parts of water, 1 part of foaming agent, 20 parts of methyl methacrylate, 1 part of surfactant and 0.15 part of initiator;
And the component B comprises the following components: lime gypsum mixture (the mass ratio of lime to gypsum is 1:7) 100 parts, water 100 parts, isocyanate 60 parts, methyl methacrylate 20 parts, surfactant 1 part and initiator 0.15 part;
the preparation method of the weak broken surrounding rock reinforcement grouting material comprises the following steps:
(1) Preparing a component A and a component B respectively;
the preparation of the component A comprises the following steps:
S1, adding a foaming agent weighed in proportion into a beaker, and uniformly stirring by using a magnetic stirrer;
s2, adding ethanol (the mass of the ethanol is 2 times that of methyl methacrylate), an initiator, a surfactant and methyl methacrylate which are weighed in proportion into a beaker, and placing the beaker into a sonicator for ultrasonic emulsification to obtain shell emulsion; wherein the time of ultrasonic emulsification is 40min, the temperature of ultrasonic emulsification is 60 ℃, and the frequency of ultrasonic is 35kHz;
s3, dropwise adding the product obtained in the step S1 into the shell material emulsion obtained in the step S2, and stirring for 45min by using a magnetic stirrer;
S4, putting the liquid stirred in the step S3 into a rotary steaming instrument for rotary steaming to obtain powder, putting the powder into a drying box for drying for 10min, and taking out the powder to grind the powder into 200 meshes;
s5, uniformly mixing the powder obtained in the step S4, the sulphoaluminate cement clinker and water to obtain the component A.
The preparation of the component B comprises the following steps:
S1, adding the isocyanate weighed in proportion into a beaker, and uniformly stirring by using a magnetic stirrer;
s2, adding ethanol (the mass of the ethanol is 2 times that of methyl methacrylate), an initiator, a surfactant and methyl methacrylate which are weighed in proportion into a beaker, and placing the beaker into a sonicator for ultrasonic emulsification to obtain shell emulsion; wherein the time of ultrasonic emulsification is 40min, the temperature of ultrasonic emulsification is 60 ℃, and the frequency of ultrasonic is 35kHz;
S3, dropwise adding the product obtained in the step S1 into the shell emulsion, and stirring for 45min by using a magnetic stirrer;
S4, putting the liquid stirred in the step S3 into a rotary steaming instrument for rotary steaming to obtain powder, putting the powder into a drying box for drying for 10min, and taking out the powder to grind the powder into 200 meshes;
And S5, uniformly mixing the powder obtained in the step S4, the lime gypsum mixture and water to obtain the component B.
(2) Mixing and stirring the component A and the component B for 1min, and pumping by a double-liquid grouting pump to be input into a filling grouting area.
Example 2
The weak broken surrounding rock reinforcing grouting material comprises the following raw materials in parts by weight:
And (3) a component A: 100 parts of sulphoaluminate cement clinker, 100 parts of water, 1 part of foaming agent, 20 parts of methyl methacrylate, 1 part of surfactant and 0.15 part of initiator;
and the component B comprises the following components: lime gypsum mixture (the mass ratio of lime to gypsum is 1:7) 100 parts, water 100 parts, isocyanate 60 parts, methyl methacrylate 20 parts, surfactant 0.5 parts and initiator 0.13 parts;
the preparation method of the weak broken surrounding rock reinforcement grouting material comprises the following steps:
(1) Preparing a component A and a component B respectively;
the preparation of the component A comprises the following steps:
S1, adding a foaming agent weighed in proportion into a beaker, and uniformly stirring by using a magnetic stirrer;
s2, adding ethanol (the mass of the ethanol is 2 times that of methyl methacrylate), an initiator, a surfactant and methyl methacrylate which are weighed in proportion into a beaker, and placing the beaker into a sonicator for ultrasonic emulsification to obtain shell emulsion; wherein the time of ultrasonic emulsification is 40min, the temperature of ultrasonic emulsification is 60 ℃, and the frequency of ultrasonic is 35kHz;
s3, dropwise adding the product obtained in the step S1 into the shell material emulsion obtained in the step S2, and stirring for 45min by using a magnetic stirrer;
S4, putting the liquid stirred in the step S3 into a rotary steaming instrument for rotary steaming to obtain powder, putting the powder into a drying box for drying for 10min, and taking out the powder to grind the powder into 200 meshes;
s5, uniformly mixing the powder obtained in the step S4, the sulphoaluminate cement clinker and water to obtain the component A.
The preparation of the component B comprises the following steps:
S1, adding the isocyanate weighed in proportion into a beaker, and uniformly stirring by using a magnetic stirrer;
s2, adding ethanol (the mass of the ethanol is 2 times that of methyl methacrylate), an initiator, a surfactant and methyl methacrylate which are weighed in proportion into a beaker, and placing the beaker into a sonicator for ultrasonic emulsification to obtain shell emulsion; wherein the time of ultrasonic emulsification is 40min, the temperature of ultrasonic emulsification is 60 ℃, and the frequency of ultrasonic is 35kHz;
S3, dropwise adding the product obtained in the step S1 into the shell emulsion, and stirring for 45min by using a magnetic stirrer;
S4, putting the liquid stirred in the step S3 into a rotary steaming instrument for rotary steaming to obtain powder, putting the powder into a drying box for drying for 10min, and taking out the powder to grind the powder into 200 meshes;
And S5, uniformly mixing the powder obtained in the step S4, the lime gypsum mixture and water to obtain the component B.
(2) Mixing and stirring the component A and the component B for 1min, and pumping by a double-liquid grouting pump to be input into a filling grouting area.
Example 3
The weak broken surrounding rock reinforcing grouting material comprises the following raw materials in parts by weight:
And (3) a component A: 100 parts of sulphoaluminate cement clinker, 100 parts of water, 1 part of foaming agent, 20 parts of methyl methacrylate, 1 part of surfactant and 0.15 part of initiator;
and the component B comprises the following components: 100 parts of lime gypsum mixture (the mass ratio of lime to gypsum is 1:7), 100 parts of water, 75 parts of isocyanate, 25 parts of methyl methacrylate, 0.8 part of surfactant and 0.15 part of initiator;
the preparation method of the weak broken surrounding rock reinforcement grouting material comprises the following steps:
(1) Preparing a component A and a component B respectively;
the preparation of the component A comprises the following steps:
S1, adding a foaming agent weighed in proportion into a beaker, and uniformly stirring by using a magnetic stirrer;
S2, adding ethanol (the mass of the ethanol is 2 times that of methyl methacrylate), an initiator, a surfactant and methyl methacrylate which are weighed in proportion into a beaker, and placing the beaker into a sonicator for ultrasonic emulsification to obtain shell material emulsion; wherein the time of ultrasonic emulsification is 40min, the temperature of ultrasonic emulsification is 60 ℃, and the frequency of ultrasonic is 35kHz;
s3, dropwise adding the product obtained in the step S1 into the shell material emulsion obtained in the step S2, and stirring for 45min by using a magnetic stirrer;
S4, putting the liquid stirred in the step S3 into a rotary steaming instrument for rotary steaming to obtain powder, putting the powder into a drying box for drying for 10min, and taking out the powder to grind the powder into 200 meshes;
s5, uniformly mixing the powder obtained in the step S4, the sulphoaluminate cement clinker and water to obtain the component A.
The preparation of the component B comprises the following steps:
S1, adding the isocyanate weighed in proportion into a beaker, and uniformly stirring by using a magnetic stirrer;
s2, adding ethanol (the mass of the ethanol is 2 times that of methyl methacrylate), an initiator, a surfactant and methyl methacrylate which are weighed in proportion into a beaker, and placing the beaker into a sonicator for ultrasonic emulsification to obtain shell emulsion; wherein the time of ultrasonic emulsification is 40min, the temperature of ultrasonic emulsification is 60 ℃, and the frequency of ultrasonic is 35kHz;
S3, dropwise adding the product obtained in the step S1 into the shell emulsion, and stirring for 45min by using a magnetic stirrer;
S4, putting the liquid stirred in the step S3 into a rotary steaming instrument for rotary steaming to obtain powder, putting the powder into a drying box for drying for 10min, and taking out the powder to grind the powder into 200 meshes;
And S5, uniformly mixing the powder obtained in the step S4, the lime gypsum mixture and water to obtain the component B.
(2) Mixing and stirring the component A and the component B for 1min, and pumping by a double-liquid grouting pump to be input into a filling grouting area.
Comparative example 1
This comparative example provides a two-fluid grouting material differing from example 1 only in that methyl methacrylate in A, B components is replaced with isobutyl methacrylate; other components, content and preparation method were the same as in example 1.
Comparative example 2
This comparative example provides a two-liquid grouting material differing from example 2 only in that the benzophenone diisocyanate in the B component is replaced with dimethylbenzene diisocyanate; other components, content and preparation method were the same as in example 2.
Comparative example 3
This comparative example provides a two-fluid grouting material differing from example 1 only in that the amount of isocyanate used is 20 parts; other components, content and preparation method were the same as in example 1.
Comparative example 4
This comparative example provides a two-fluid grouting material differing from example 2 only in that there are no cenospheres and foaming agent in component a; other components, content and preparation method were the same as in example 2. Specifically:
The component A comprises the following raw materials in parts by weight: 100 parts of sulphoaluminate cement clinker and 100 parts of water
The preparation of the component A comprises the following steps: and uniformly mixing the sulphoaluminate cement clinker and water to obtain the component A of the comparative example.
Experimental example
The grouting materials of examples and comparative examples were tested for initial setting time, final setting time, adhesive strength, expansion ratio, and water absorption:
the testing method comprises the following steps:
the initial setting and final setting test method of cement mortar generally refers to the following national standards:
1. The initial setting time testing method comprises the following steps: GB/T1346-2011 method for measuring initial setting time of cement mortar.
2. The final setting time test method comprises the following steps: GB/T1346-2011 method for determining final setting time of cement mortar.
3. The method for testing the bonding strength of cement mortar generally refers to the following national standards: GB/T17671-2021 cement mortar strength test method (ISO method).
4. The foaming multiple testing method comprises the following steps: and (3) stirring and molding the double-liquid grouting material, curing, measuring the volume of the double-liquid grouting material after curing for 1d, and dividing the measured volume by the volume of a mold during molding to obtain the foaming multiple.
5. Water absorption test: the sample surface was cleaned and dried and the residue and impurities were removed with compressed air. The samples were then weighed and the mass recorded. The testing process comprises the following steps:
(1) Immersing the sample in water, completely immersing, and keeping the water depth unchanged;
(2) Taking out the sample after 24 hours, wiping the surface with cloth paper to dry the water, and recording the wet weight of the sample;
(3) Putting the sample into an oven, and drying for 24 hours at the constant temperature of 100+/-5 ℃;
(4) Taking out the sample and measuring the dry weight thereof;
(5) Data amount: from the above data, the water absorption (S) of the concrete sample can be calculated. The calculation formula is as follows: s= (wet weight-dry weight)/dry weight x 100%; wherein S is the water absorption of the concrete, the wet weight is the weight of the immersed sample, and the dry weight is the weight of the dried sample.
The test results are shown in table 1 below:
TABLE 1
As can be seen from the combination of example 1 and comparative example 1: different hollow microsphere shell materials can influence the coating rate of the core material; the method shows that the methyl methacrylate hollow microsphere has good effect and high coating rate (after the methyl methacrylate is replaced by the isobutyl methacrylate, the coating rate is small, and the foaming agent in the component A and the isocyanate in the component B are difficult to wrap, so that the foaming multiple of the prepared weak broken surrounding rock reinforcing grouting material is reduced, the water absorption rate is increased and the water blocking property is poor). As can be seen from the combination of example 1 and comparative example 2: the selection of isocyanate also has an influence on the bonding strength of the grouting material, and after the diphenyl ketone diisocyanate is replaced by the dimethyl benzene diisocyanate in the comparative example 2, the bonding strength of the grouting material is obviously reduced (the isocyanate mainly plays roles of bonding and water shutoff in the weak broken surrounding rock reinforcing grouting material, and the diphenyl ketone diisocyanate plays better roles of bonding and water shutoff in the system).
As can be seen from the combination of example 1 and comparative example 3: the isocyanate of comparative example 3 was reduced in amount and in adhesion, and the isocyanate was difficult to rapidly react with a large amount of the foaming agent to expand, affecting the initial setting time and final setting time.
As can be seen from the combination of example 1 and comparative example 4: the foaming agent can provide expansion and water shutoff effects in the reaction process of isocyanate and cement, and if the foaming agent is not used, the grouting material cannot react, expand and coagulate rapidly, the coagulation time is influenced, and the water absorption rate is slightly influenced.
To sum up: in the embodiment of the invention, the influence of the amounts of the isocyanate with different parts on the adhesive property of the grouting material is reflected, and the cementing and water blocking effects of the isocyanate are increased along with the increase of the blending amount. Meanwhile, the setting time of the grouting material is also affected differently by the water cement ratio. The effect of the foaming agent is obviously reflected in the embodiment, the foaming volume is increased, and the pressure-applied grouting material can be generated to push grouting. The grouting material provided by the embodiment of the invention has relatively low mass water absorption and can show good waterproof performance.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The weak broken surrounding rock reinforcing grouting material is characterized by comprising a component A and a component B;
the component A contains foaming microcapsule and sulphoaluminate cement clinker, the shell of the foaming microcapsule is methyl methacrylate hollow microsphere, and the core of the foaming microcapsule is foaming agent;
the component B contains an isocyanate microcapsule and a limestone-gypsum mixture, the shell of the isocyanate microcapsule is methyl methacrylate hollow microsphere, and the core of the isocyanate microcapsule is isocyanate.
2. The weak broken surrounding rock reinforcing grouting material according to claim 1, wherein the a component comprises the following components in parts by weight: 100 parts of sulphoaluminate cement clinker, 100-150 parts of water, 1-3 parts of foaming agent, 20-25 parts of methyl methacrylate, 0.8-1 part of surfactant and 0.12-0.15 part of initiator;
the component B comprises the following components in parts by weight: 100-150 parts of water, 100 parts of lime gypsum mixture, 50-75 parts of isocyanate, 20-25 parts of methyl methacrylate, 0.8-1 part of surfactant and 0.12-0.15 part of initiator.
3. The weak broken surrounding rock reinforcing grouting material according to claim 2, wherein the isocyanate is benzophenone diisocyanate;
the foaming agent is polyethylene glycol;
the surfactant is AEO-15;
the initiator is azobisisobutyronitrile.
4. The weak broken surrounding rock reinforcing grouting material of claim 2, wherein the mass ratio of lime to gypsum in the lime gypsum mixture is 1:7.
5. A method for preparing a weak broken surrounding rock reinforced grouting material as claimed in any one of claims 1 to 4, comprising the steps of:
(1) Preparing a component A and a component B respectively;
(2) Stirring and mixing the component A and the component B to obtain the weak broken surrounding rock reinforcing grouting material;
in the step (1), the component A is obtained by dropwise dripping a foaming agent into a shell material emulsion, magnetically stirring for 30-60min while dripping, rotationally steaming the obtained mixed solution to obtain powder, drying the powder, grinding the powder until the powder can pass through a 200-mesh sieve, adding the sulphoaluminate cement clinker, and stirring and mixing with water;
The component B is prepared by dropwise adding isocyanate into shell emulsion, magnetically stirring for 30-60min while dropwise adding, steaming the obtained mixed solution to obtain powder, drying the powder, grinding the powder to 200 mesh, adding the limestone-gypsum mixture, and stirring and mixing with water;
The preparation of the shell emulsion comprises the following steps: and (3) performing ultrasonic emulsification on the solvent, the initiator, the surfactant and the methyl methacrylate in a sonic breaker to obtain the shell material emulsion.
6. The method for preparing the weak broken surrounding rock reinforced grouting material according to claim 5, wherein the ultrasonic frequency is 35kHz, the ultrasonic emulsification time is 40min, and the ultrasonic emulsification temperature is less than or equal to 80 ℃;
The solvent is ethanol, and the addition amount of the solvent is 2 times of that of methyl methacrylate.
7. The method for producing a weakly broken surrounding rock reinforced grouting material according to claim 6, wherein in the step (2), the mixing and stirring time of the component a and the component B is 1-2min.
8. A method of grouting weakly fractured surrounding rock reinforcement grouting material according to any one of claims 1 to 4, comprising the steps of: and conveying the weak broken surrounding rock reinforcing grouting material to a filling grouting area by adopting a double-liquid grouting pump.
9. The grouting method for reinforcing grouting material for weak broken surrounding rock according to claim 8, wherein the grouting pressure of the double-fluid grouting pump is greater than 5MPa.
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