CN113979706A - Composite grouting reinforcement material and preparation method thereof - Google Patents
Composite grouting reinforcement material and preparation method thereof Download PDFInfo
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- CN113979706A CN113979706A CN202111337394.6A CN202111337394A CN113979706A CN 113979706 A CN113979706 A CN 113979706A CN 202111337394 A CN202111337394 A CN 202111337394A CN 113979706 A CN113979706 A CN 113979706A
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- 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
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- 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
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- 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
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- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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- 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
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- Chemical & Material Sciences (AREA)
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a preparation method of a composite grouting reinforcement material, which comprises the following steps: providing cement, quartz powder and cellulose, and mixing to obtain a component A; providing calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent, and mixing to obtain a component B; premixing the component A and the component B to obtain premixed powder; providing water, and mixing the water with the premixed powder to obtain a composite grouting reinforcement material; the mass percentages of the cement, the quartz powder, the cellulose, the calcium fluoroaluminate, the calcium oxide, the dehydrated gypsum, the silica micropowder and the water reducing agent are 60-67%: 5-16%: 0.2-0.5%: 8-19%: 5-15%: 5-16%: 5-17%: 0.2-0.5%; the mass ratio of water to the premixed powder is 100: 40-80, and the composite grouting reinforcement material has good permeability, large fluidity, injectability, adjustable setting time, high compressive strength and strong adaptability to coal and rock masses.
Description
Technical Field
The invention relates to the field of grouting reinforcement, and particularly discloses a composite grouting reinforcement material and a preparation method thereof.
Background
In China, coal accounts for about 70% of primary energy production and consumption structures. As the coal mining depth increases, the coal is broken and soft. The accidents of rib caving and roof caving are increased continuously in the process of mining the mine, and the serious influence is brought to the mining of the mining working face. Therefore, the stability of the coal rock mass is ensured, the caving roof caving of the excavation working face is prevented, the safe production is realized, and the method is one of the problems which need to be solved in the coal mining process.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a composite grouting reinforcement material and a method for preparing the same. The composite grouting reinforcement material provided by the preparation method has good permeability, large fluidity, injectability, adjustable setting time, high compressive strength and strong adaptability to coal rock mass.
In order to achieve the above and other related objects, a first aspect of the present invention provides a method for preparing a composite grouting reinforcement material, the method comprising: providing cement, quartz powder and cellulose, and mixing to obtain a component A;
providing calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent, and mixing to obtain a component B;
premixing the component A and the component B to obtain premixed powder;
providing water, and mixing the water with the premixed powder to obtain a composite grouting reinforcement material;
the cement, quartz powder, cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent are 60-67% by mass: 5-16%: 0.2-0.5%: 8-19%: 5-15%: 5-16%: 5-17%: 0.2-0.5%;
the mass ratio of the water to the premixed powder is 100: 40-80.
According to the preparation method of the composite grouting reinforcement material, the cement is selected from sulphoaluminate cement.
According to the preparation method of the composite grouting reinforcement material, the granularity of the sulphoaluminate cement is 35-45 mu m.
According to the preparation method of the composite grouting reinforcement material, the granularity of the sulphoaluminate cement is 40 microns.
According to the preparation method of the composite grouting reinforcement material, the sulphoaluminate cement with the granularity of 40 mu m accounts for 95-98% of the total amount of cement in percentage by mass.
According to the preparation method of the composite grouting reinforcement material, the granularity of the quartz powder is less than or equal to 40 mu m.
The invention also provides a composite grouting reinforcement material obtained by the preparation method.
The compressive strength of the composite grouting reinforcement material is 40-50 Mpa.
According to the composite grouting reinforcement material, the solidification time of the composite grouting reinforcement material is 20-36S.
According to the composite grouting reinforcement material, the bonding force of the composite grouting reinforcement material is 4-6 Mpa.
According to the preparation method of the composite grouting reinforcement material, sulphoaluminate cement is selected to act together with cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum and silica micropowder to play a synergistic effect, and the prepared composite grouting reinforcement material has good permeability, high fluidity and injectability to coal and rock mass, the setting time is 20-36S, the setting time is adjustable, the compressive strength is 40-50 Mpa, the binding power is 4-6 Mpa, and the adaptability is high.
Drawings
Fig. 1 shows a schematic flow chart of a preparation method of the composite grouting reinforcement material provided by the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 1, the present invention provides a method for preparing a composite grouting reinforcement material, wherein the method uses, for example, sulphoaluminate cement, and acts together with cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, and silica micropowder to exert a synergistic effect, such that the prepared composite grouting reinforcement material has excellent permeability, fluidity, early strength, binding power, micro-expansion, no cracking, and environmental protection, and the method for preparing the composite grouting reinforcement material provided by the present invention includes, but is not limited to, the following steps:
s1, weighing cement, quartz powder, cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent;
s2, uniformly mixing cement, quartz powder and cellulose to obtain a component A;
s3, uniformly mixing calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent to obtain a component B;
s4, uniformly premixing the component A and the component B to obtain premixed powder;
and S5, uniformly mixing water and the premixed powder to obtain the composite grouting reinforcement material.
As shown in fig. 1, in step S1, the cement may be a sulphoaluminate cement, the sulphoaluminate cement and the component B react rapidly to perform a gelling effect, so as to improve the binding force between the composite grouting reinforcement material and the coal rock mass, the particle size of the cement may be 35 to 45 μm, such as 35 μm, 40 μm, and 45 μm, and the sulphoaluminate cement having a particle size of 40 μm may account for 95% to 98%, such as 95%, 96%, 97%, and 98%, by mass, of the total amount of the cement, thereby ensuring that the composite grouting reinforcement material has a high permeability.
As shown in fig. 1, in step S1, the quartz powder may be selected from silicate minerals, the particle size may be greater than or equal to 120 mesh, for example, 140 mesh, 145 mesh, and 150 mesh, and the quartz powder is used to exert a synergistic effect with other components, so as to increase the material strength, and simultaneously reduce the material viscosity, so that the composite grouting reinforcement material has better fluidity and permeability.
As shown in fig. 1, in step S1, the cellulose has binding, thickening, reinforcing, emulsifying, water-retaining and suspending effects, so as to ensure that the composite grouting reinforcement material has excellent binding power and required fluidity, and improve early strength. The cellulose plays a role in the invention to ensure that the materials are mixed more uniformly and do not delaminate.
As shown in fig. 1, in step S1, the calcium fluoroaluminate may be selected from calcium fluoroaluminate minerals, the particle size of which may be greater than or equal to 120 mesh, for example, 120 mesh, 125 mesh, and 130 mesh, and the calcium fluoroaluminate interacts with the cement to improve the early strength performance of the cement, so that the compressive strength of the prepared composite grouting reinforcement material is 40 to 50Mpa, for example, 40Mpa, 45Mpa, and 50 Mpa.
As shown in fig. 1, in step S1, the particle size of the calcium oxide may be greater than or equal to 120 mesh, for example, 120 mesh, 125 mesh, and 130 mesh, and the reaction time of the composite grouting reinforcement material adjusted by the calcium oxide and the dehydrated gypsum may be less than or equal to 60S, for example, 60S, 55S, and 50S.
As shown in fig. 1, in step S1, the fine silica powder may be selected from natural quartz (SiO)2) Or fused quartz (amorphous SiO obtained by melting and cooling natural quartz at high temperature2) The silicon micro powder is processed by a plurality of processes such as crushing, ball milling, flotation, acid washing purification, high-purity water treatment and the like, the granularity of the silicon micro powder can be larger than or equal to 120 meshes, for example, 120 meshes, 125 meshes and 130 meshes, and the chemical property stability and early strength of the composite grouting reinforcement material can be improved. The silicon micro powder and the quartz powder have a synergistic effect, and the fluidity, the chemical property stability and the early strength of the composite grouting reinforcement material are improved.
As shown in fig. 1, in step S1, the water reducing agent may be selected from anionic surfactants, such as lignosulfonate and naphthalene sulfonate formaldehyde polymer, and has a dispersing effect on other components in the composite grouting reinforcement material, so as to improve the workability thereof, reduce the unit water consumption, and improve the fluidity of the composite grouting reinforcement material.
As shown in fig. 1, in step S2, cement, quartz powder, and cellulose are uniformly mixed to obtain a component a, and in step S3, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica powder, and a water reducing agent are uniformly mixed to obtain a component B; in step S4, uniformly premixing the component A and the component B to obtain premixed powder; the cement, the quartz powder, the cellulose, the calcium fluoroaluminate, the calcium oxide, the dehydrated gypsum, the silica micropowder and the water reducing agent can be prepared from the following components in percentage by mass: 60-67%: 5-16%: 0.2-0.5%: 8-19%: 5-15%: 5-16%: 5-17%: 0.2-0.5%; for example, the following are: 65%: 9.6%: 0.2%: 8%: 5%: 6%: 6%: 0.2%, 60%: 7.3%: 0.4%: 10%: 7%: 8%: 7%: 0.3%, 60%: 5%: 0.3%: 9%: 6%: 9.3%: 10%: 0.4%, 64%: 10%: 0.5%: 8%: 5%: 6%: 6%: 0.5 percent. The composite grouting reinforcement material obtained by mixing the components according to the proportion can play the synergistic effect of the components, improve the binding force between the composite grouting reinforcement material and the coal rock mass, improve the permeability of the composite grouting reinforcement material to the coal rock mass, improve the fluidity, the injectability and the compressive strength of the composite grouting reinforcement material, and enable the composite grouting reinforcement material to have adjustable setting time and strong adaptability.
As shown in fig. 1, in step S5, mixing water and premixed powder to obtain a composite grouting reinforcement material, where the mass ratio of the water to the premixed powder may be 100: 40-80, for example 100: 40. 100, and (2) a step of: 60. 100, and (2) a step of: 80, the composite grouting reinforcement material obtained according to the proportion has excellent permeability and fluidity for coal rock mass.
The present invention will be explained more clearly below with reference to specific examples.
Example 1
The embodiment provides a preparation method of a composite grouting reinforcement material, which comprises the following steps:
step one, according to mass percent 65%: 9.6%: 0.2%: 8%: 5%: 6%: 6%: weighing 0.2% of sulphoaluminate cement, quartz powder, cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent respectively, wherein in the sulphoaluminate cement, the sulphoaluminate cement with the granularity of 40 mu m accounts for 95% of the total amount of the cement;
step two, mixing sulphoaluminate cement, quartz powder and cellulose uniformly to obtain a component A;
step three, uniformly mixing calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent to obtain a component B;
step four, uniformly premixing the component A and the component B to obtain premixed powder;
step five, mixing the water and the premixed powder according to the mass ratio of 100: and taking water by 40, and mixing the water with the premixed powder to obtain the composite grouting reinforcing material.
The composite grouting reinforcement material is grouted by using a double-liquid grouting pump.
Example 2
The embodiment provides a preparation method of a composite grouting reinforcement material, which comprises the following steps:
step one, according to the mass percentage of 60%: 7.3%: 0.4%: 10%: 7%: 8%: 7%: weighing 0.3% of sulphoaluminate cement, quartz powder, cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent respectively, wherein in the sulphoaluminate cement, the sulphoaluminate cement with the granularity of 40 mu m accounts for 96% of the total amount of the cement;
step two, mixing sulphoaluminate cement, quartz powder and cellulose uniformly to obtain a component A;
step three, uniformly mixing calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent to obtain a component B;
step four, uniformly premixing the component A and the component B to obtain premixed powder;
step five, mixing the water and the premixed powder according to the mass ratio of 100: and taking water by 50, and mixing the water with the premixed powder to obtain the composite grouting reinforcing material.
The composite grouting reinforcement material is grouted by using a double-liquid grouting pump.
Example 3
The embodiment provides a preparation method of a composite grouting reinforcement material, which comprises the following steps:
step one, according to the mass percentage of 60%: 5%: 0.3%: 9%: 6%: 9.3%: 10%: weighing 0.4% of sulphoaluminate cement, quartz powder, cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent respectively, wherein in the sulphoaluminate cement, the sulphoaluminate cement with the granularity of 40 mu m accounts for 97% of the total amount of the cement;
step two, mixing sulphoaluminate cement, quartz powder and cellulose uniformly to obtain a component A;
step three, uniformly mixing calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent to obtain a component B;
step four, uniformly premixing the component A and the component B to obtain premixed powder;
step five, mixing the water and the premixed powder according to the mass ratio of 100: and taking water by 60, and uniformly mixing the water with the premixed powder to obtain the composite grouting reinforcing material.
The composite grouting reinforcement material is grouted by using a double-liquid grouting pump.
Example 4
The embodiment provides a preparation method of a composite grouting reinforcement material, which comprises the following steps:
step one, according to mass percent 64%: 10%: 0.5%: 8%: 5%: 6%: 6%: weighing 0.5% of sulphoaluminate cement, quartz powder, cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent respectively, wherein in the sulphoaluminate cement, the sulphoaluminate cement with the granularity of 40 mu m accounts for 98% of the total amount of the cement;
step two, mixing sulphoaluminate cement, quartz powder and cellulose uniformly to obtain a component A;
step three, uniformly mixing calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent to obtain a component B;
step four, uniformly premixing the component A and the component B to obtain premixed powder;
step five, mixing the water and the premixed powder according to the mass ratio of 100: and (5) taking water by 80, and uniformly mixing the water and the premixed powder to obtain the composite grouting reinforcing material.
The composite grouting reinforcement material is grouted by using a double-liquid grouting pump.
Comparative example 1
This comparative example provides a method of preparing a composite grouting reinforcement material, comprising:
step one, mixing 25% of sulphoaluminate cement with the granularity of 50 microns, quartz powder, cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent according to the mass percentage: 4%: 1%: 29%: 2%: 18%: 20%: 0.8 percent of the mixture is uniformly premixed to obtain premixed powder;
the sulphoaluminate cement with the granularity of 50 mu m accounts for 95 percent of the total amount of the cement;
step two, mixing water and the premixed powder according to the mass ratio of 100: 83 to obtain the composite grouting reinforcement material.
The composite grouting reinforcement material is grouted by using a double-liquid grouting pump.
Comparative example 2
This comparative example provides a method of preparing a composite grouting reinforcement material, comprising:
step one, mixing 50-micron-sized sulphoaluminate cement, quartz powder, cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent according to the mass percent of 11%: 1%: 4%: 20%: 17%: 26%: 20%: 1% of the mixture is uniformly premixed to obtain premixed powder;
the sulphoaluminate cement with the granularity of 50 mu m accounts for 95 percent of the total amount of the cement;
step two, mixing water and the premixed powder according to the mass ratio of 100: 85, and mixing uniformly to obtain the composite grouting reinforcement material.
The composite grouting reinforcement material is grouted by using a double-liquid grouting pump.
Performance testing
The above examples 1 to 4, and comparative examples 1 to 2 were tested by the following test items:
measuring the setting time (measuring the initial setting time and the final setting time according to GB175-2007 general Portland Cement);
measuring the compressive strength (according to GB/T17671-1999 cement mortar strength test method);
measuring the binding power (according to GB/T17671-1999 cement mortar strength test method); the results are shown in Table 1.
TABLE 1
As shown in the above table 1, the preparation method provided by the invention is based on the combined action of the sulphoaluminate cement, the cellulose, the calcium fluoroaluminate, the calcium oxide, the dehydrated gypsum and the silica micropowder, and the synergistic effect is exerted, so that the prepared composite grouting reinforcement material has the compressive strength of 40-50 Mpa and the binding force of 4-6 Mpa, is green and environment-friendly, and can be used for reinforcing the coal rock mass, so that the stability of the coal rock mass can be ensured, the caving of the mining working face can be prevented, and the safe production can be realized.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements to those skilled in the art without departing from the spirit and scope of the invention, which should be construed as broadly as the invention; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (10)
1. The preparation method of the composite grouting reinforcement material is characterized by comprising the following steps:
providing cement, quartz powder and cellulose, and uniformly mixing to obtain a component A;
providing calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent, and uniformly mixing to obtain a component B;
uniformly premixing the component A and the component B to obtain premixed powder;
providing water, and uniformly mixing the water and the premixed powder to obtain a composite grouting reinforcement material;
the cement, quartz powder, cellulose, calcium fluoroaluminate, calcium oxide, dehydrated gypsum, silica micropowder and a water reducing agent are 60-67% by mass: 5-16%: 0.2-0.5%: 8-19%: 5-15%: 5-16%: 5-17%: 0.2-0.5%;
the mass ratio of the water to the premixed powder is 100: 40-80.
2. A method of producing a composite grouting reinforcement material according to claim 1, characterised in that the cement is selected from sulphoaluminate cements.
3. The preparation method of the composite grouting reinforcement material according to claim 2, wherein the granularity of the sulphoaluminate cement is 35-45 μm.
4. A method for preparing a composite grouting reinforcement material according to claim 2, characterized in that the particle size of the sulphoaluminate cement is 40 μm.
5. The method for preparing the composite grouting reinforcement material according to claim 4, wherein the sulphoaluminate cement with the granularity of 40 μm accounts for 95-98% of the total cement in percentage by mass.
6. The method for preparing the composite grouting reinforcement material according to claim 1, wherein the particle size of the quartz powder is less than or equal to 40 μm.
7. A composite grouting reinforcement material obtained by the preparation method of any one of claims 1 to 6.
8. The composite grouting reinforcement material as claimed in claim 7, wherein the compressive strength of the composite grouting reinforcement material is 40-50 Mpa.
9. The composite grouting reinforcement material of claim 7, wherein the setting time of the composite grouting reinforcement material is 20-36S.
10. The composite grouting reinforcement material of claim 7, wherein the adhesive force of the composite grouting reinforcement material is 4-6 MPa.
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2021
- 2021-11-03 CN CN202111337394.6A patent/CN113979706A/en active Pending
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| CN102503324A (en) * | 2011-11-22 | 2012-06-20 | 北京新中岩建材科技有限公司 | Anchoring grouting material as well as preparation method and application thereof |
| CN106365564A (en) * | 2016-08-26 | 2017-02-01 | 安徽佳泰矿业科技有限公司 | Mining inorganic ultrafine composite grouting and water plugging material and preparation method thereof |
| CN106833568A (en) * | 2017-01-19 | 2017-06-13 | 安徽理工大学 | A kind of mining sealing material of early-strength |
| EP3822241A1 (en) * | 2019-11-15 | 2021-05-19 | Baumit Beteiligungen GmbH | Cement-based joint mortar and its application |
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