CN112830746A - Ultrahigh-performance roadway guniting material and construction method thereof - Google Patents
Ultrahigh-performance roadway guniting material and construction method thereof Download PDFInfo
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- CN112830746A CN112830746A CN202110289763.2A CN202110289763A CN112830746A CN 112830746 A CN112830746 A CN 112830746A CN 202110289763 A CN202110289763 A CN 202110289763A CN 112830746 A CN112830746 A CN 112830746A
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- 239000000463 material Substances 0.000 title claims abstract description 81
- 238000010276 construction Methods 0.000 title claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000000843 powder Substances 0.000 claims abstract description 41
- 239000004568 cement Substances 0.000 claims abstract description 32
- 229920001971 elastomer Polymers 0.000 claims abstract description 29
- 239000000835 fiber Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000006004 Quartz sand Substances 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 239000004816 latex Substances 0.000 claims abstract description 11
- 229920000126 latex Polymers 0.000 claims abstract description 11
- 239000002562 thickening agent Substances 0.000 claims abstract description 11
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 7
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 7
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 7
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 5
- 239000004576 sand Substances 0.000 claims description 34
- 239000004743 Polypropylene Substances 0.000 claims description 11
- -1 polypropylene Polymers 0.000 claims description 11
- 229920001155 polypropylene Polymers 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 4
- 229920006027 ternary co-polymer Polymers 0.000 claims description 4
- 229920002554 vinyl polymer Polymers 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 229920001567 vinyl ester resin Polymers 0.000 claims description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 8
- 239000011435 rock Substances 0.000 abstract description 8
- 229920000642 polymer Polymers 0.000 abstract description 2
- 239000004570 mortar (masonry) Substances 0.000 description 16
- 238000012360 testing method Methods 0.000 description 15
- 239000004571 lime Substances 0.000 description 11
- 238000005507 spraying Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 6
- 239000003566 sealing material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000011083 cement mortar Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 238000007906 compression Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000011378 shotcrete Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
Abstract
The invention discloses an ultrahigh-performance roadway guniting material and a construction method thereof. The roadway guniting material is prepared from the following components: cement, quartz sand, a water reducing agent, a thickening agent, rubber powder and fibers; the mass ratio of the cement to the quartz sand is 1: 2, in the roadway guniting material, the water reducing agent can be a polycarboxylic acid high-efficiency water reducing agent; the dosage of the water reducing agent can be 0.1-0.3% of the total mass of the cement and the quartz sand, and the thickening agent is hydroxypropyl methyl cellulose; the dosage of the thickening agent is 0.1-0.3% of the total mass of the cement and the quartz sand, and the rubber powder is redispersible latex powder. The polymer rubber powder and the anti-cracking short fibers are introduced into the guniting material, so that the guniting material has certain toughness and anti-cracking performance, can adapt to cracking deformation of surrounding rocks, and plays a role in preventing deformation and weathering of the surrounding rocks.
Description
Technical Field
The invention relates to an ultrahigh-performance roadway guniting material and a construction method thereof, and belongs to the field of mine roadway construction.
Background
Mine construction and ore body mining need dig a large amount of tunnels as transportation and pedestrian's passageway, for extension tunnel service life and country rock deformation control, will carry out the construction of hanging net whitewashing on the tunnel surface, generally adopt concrete whitewashing material in the past, whitewashing body tensile and compressive strength are low, and easy cracking warp, construction speed is slow, and operation environment dust content is high during the construction, endangers constructor's healthy. Therefore, there is a need for improvements to existing roadway gunning materials.
Disclosure of Invention
The invention aims to provide an ultrahigh-performance roadway guniting material, which is characterized in that polymer rubber powder and anti-cracking short fibers are introduced into the guniting material, so that the guniting material has certain toughness and anti-cracking performance, can adapt to cracking deformation of surrounding rocks, and plays a role in preventing deformation and weathering of the surrounding rocks.
The roadway guniting material provided by the invention is prepared from the following components:
cement, quartz sand, a water reducing agent, a thickening agent, rubber powder and fibers;
the mass ratio of the cement to the quartz sand is 1: 2.
in the above-mentioned roadway guniting material, the cement can be portland cement, preferably No. 42.5 ordinary portland cement.
In the roadway guniting material, the quartz sand can be a mixture of medium sand and fine sand, and the mass ratio of the medium sand to the fine sand can be 1: 1;
the medium sand can be quartz sand, river sand or aeolian sand of 20-40 meshes;
the fine sand can be quartz sand, river sand or aeolian sand of 40-80 meshes.
In the roadway guniting material, the water reducing agent can be a polycarboxylic acid high-efficiency water reducing agent;
the amount of the water reducing agent can be 0.1-0.3%, preferably 0.25% of the total mass of the cement and the quartz sand.
In the roadway guniting material, the thickening agent can be hydroxypropyl methyl cellulose;
the amount of the thickener is 0.1-0.3%, preferably 0.2% of the total mass of the cement and the quartz sand.
In the roadway guniting material, the rubber powder can be re-dispersible latex powder;
the redispersible rubber powder can be ethylene-vinyl acetate copolymer rubber powder, ethylene-vinyl chloride-vinyl orthosilicate ternary copolymer rubber powder, vinyl acetate-ethylene-higher fatty acid vinyl ester ternary copolymer rubber powder or acrylate-styrene copolymer rubber powder.
The dosage of the rubber powder is 1-2%, preferably 1.5% of the total mass of the cement and the quartz sand.
In the roadway guniting material, the fibers can be polypropylene short fibers, and the length can be 5-20 mm;
the dosage of the fiber can be 0.1-0.15 per mill of the total mass of the cement and the quartz sand, and preferably 0.15 per mill.
When the roadway guniting material is adopted, construction can be carried out according to the following steps:
adding water into the roadway guniting material, and stirring to obtain a paste material; pumping the paste material to a spray gun, wherein the spray gun is connected with compressed air, and the paste material is sprayed to the surface of a roadway by taking the compressed air as power;
the using amount of the water is 15-30% of the mass of the roadway guniting material;
the stirring time is 1-5 minutes.
By adding water and stirring, the guniting construction is carried out, so that the dust content is greatly reduced, and the operating environment is improved.
The invention has the following beneficial effects:
when the roadway guniting material is adopted, the guniting speed can be increased to 1.5-2 times of the original guniting speed; the mechanical property of the material is improved, and the compressive strength, the tensile strength and the flexural strength are 3-5 times of those of the original material; the rebound quantity is reduced and is 1/6-1/10; the dust content is reduced and is 1-5% of the original content.
Drawings
FIG. 1 is a schematic view showing the measurement of fluidity in the example of the present invention.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The raw materials used in the following examples were: cement: portland cement Standard No. 42.5; sand: quartz sand (a mixture of medium sand and fine sand with a mass ratio of 1: 1, wherein the mesh number of the medium sand is 20-40 meshes, and the mesh number of the fine sand is 40-80); water reducing agent: polycarboxylic acid high-efficiency water reducing agent (early strength type); thickening and water-retaining agent: hydroxypropylmethylcellulose (HPMC); rubber powder: redispersible latex powder; fiber: the polypropylene fiber is 5-20 mm in length.
The apparatus used in the following examples was: cement mortar mixer, constant temperature and humidity curing box, electric bending resistance tester and universal tester.
Example 1 selection of mortar/Sand ratio in roadway guniting Material
The sand-lime ratio is an important indicator concerning the technical economy of the spray material. Different sand-lime ratios have a great influence on the properties, especially the mechanical properties, of the spray material. The spraying sealing material is prepared, and the good workability and the construction property of the spraying sealing material are ensured at first, and the performances are directly related to the content of cement paste.
1. Procedure of the test
The test raw materials are uniformly stirred in a cement mortar stirrer according to the test mixture ratio, the fluidity is measured, and the determination schematic diagram is shown in figure 1. Then, forming a cement test block of 40 multiplied by 160 by the material, and curing the test block in a standard cement constant-temperature constant-humidity curing box to the corresponding age under the conditions that the temperature is 20 +/-3 ℃ and the relative humidity is more than or equal to 90 percent. The detection of the compressive and flexural strength is carried out according to the method for testing the strength of the cement mortar in the standard GB17671-1999, the flexural strength test is carried out in an electric flexural tester, and the compressive strength test is carried out in a constant stress pressure tester. The detection of the positive bonding strength and the breaking strength is carried out according to the standards GB 50367-2006 appendix F and appendix H.
2. Test formulations
The specific formula is shown in table 1, wherein the rubber powder is an ethylene-vinyl acetate copolymer. The mixing amount of the rubber powder is consistent, the fluidity is controlled to be the same, and the sand-lime ratio is changed. As can be seen from Table 1, the larger the ratio of sand to ash, the larger the water demand, in order to maintain the same fluidity.
TABLE 1 test mix ratio of different mortar-sand ratios to the performance of guniting material
3. Test results
The results of the strength tests of the gunite materials with different mortar ratios are shown in Table 2, and it can be obtained from the results that the mortar ratio is increased, the water demand is increased, the compressive strength and the breaking strength are reduced in 7 days and 28 days, the bonding strength is also reduced, but the breaking ratio is increased. Mixing the raw materials in a ratio of 1: the mortar having a mortar ratio of 1 was made to have strengths of 100 units, and the relative values of the strengths after changing the mortar ratio are shown in Table 2.
TABLE 2 strength test results of guniting materials with different ratios of mortar and sand
As the sand-lime ratio decreases, the strength of the gunite material decreases significantly. The ratio of ash to sand is from 1: 1 is reduced to 1: the compressive strength and the flexural strength of 3 and 7 days are respectively reduced by 78.2 percent and 82.5 percent, and the compressive strength and the flexural strength of 28 days are respectively reduced by 63.7 percent and 66.9 percent. The folding pressure ratio increases as the sand-lime ratio decreases. The ratio of ash to sand is 1: ratio at 2 1: the folding pressure ratio of 7 days and 28 days at 1 hour is respectively increased by 23.8 percent and 19 percent, and the ratio of the ash to the sand is 1: 3 to 1: the fold/crush ratio of 2 does not increase significantly.
The sand-lime ratio is reduced, the influence on the bonding strength of the guniting material is large, and the sand-lime ratio is 1: 3, the 7-day bonding strength ratio of the guniting material to the lime-sand ratio is 1: 2, the reduction of the guniting material is 25 percent, and the ratio of the specific mortar to the specific mortar is 1: the gunite material of 1 was reduced by 30.8%.
From the above analysis results, 1: 2, the ratio of the folding to the compression of the guniting material is 1: 3, and although the ratio of lime to sand is 1: 1, the flexural strength, the compressive strength and the bonding strength of the guniting material are all 1: the guniting material of 2 is high, but the cement dosage is large, so that the method is not economical. The ratio of ash to sand is 1: 3, ratio of guniting material to mortar to sand is 1: 2, the bonding strength of the guniting material is greatly reduced, although the folding-compression ratio is more than 1: 2, but the effect is not significant. Therefore, the sand-lime ratio is selected to be 1: 2 is most preferable.
The sand-lime ratios in the following examples are all 1: 2.
example 2 Effect of rubber powder on the Properties of spray-coated sealing Material
The rubber powder is imported redispersible latex powder, and the main component of the imported redispersible latex powder is ethylene-vinyl acetate copolymer. The latex powder can obviously affect various properties of cement mortar, and most obviously improves the bonding strength of cement paste and different matrixes. And the impermeability, the fracture resistance and the toughness can be improved.
Determining the sand-lime ratio as 1: 2, according to the water reducing effect of the water reducing agent, selecting a polycarboxylic acid high-efficiency water reducing agent (early strength type) with the dosage accounting for 0.75 percent of the mass of the cement and the water-cement ratio of 2.8, and investigating the mechanical property of the spraying material by rubber powder, wherein the results are shown in table 3 (0.2 percent of thickening agent HPMC and 0.25 percent of water reducing agent are added in the formula).
TABLE 3 test results of the influence of the rubber powder on the properties of the guniting materials
As can be seen from the data in Table 3, with the increase of the mixing amount of the redispersible rubber powder, the compressive strength of the guniting material is reduced, the flexural strength is improved, the flexural ratio representing the flexibility index of the guniting material is improved, and the flexibility is improved. Meanwhile, the addition of the redispersible latex powder greatly improves the bonding force of the material, and the redispersible latex powder can be better bonded to the surface of a surrounding rock roadway, so that the surrounding rock roadway is sealed, and the roadway is prevented from being damaged by weathering. With the addition of the redispersible latex powder, the positive tensile bonding strength of the guniting material is continuously improved, and when the addition amount reaches 1.5%, the positive tensile bonding strength can reach 1.5 MPa. The adhesive powder content is continuously increased, the bonding strength is continuously improved, but the material cost is increased, and the compressive strength is continuously reduced. Therefore, the addition amount of the redispersible latex powder was determined to be 1.5%.
Example 3 Effect of Polypropylene fiber on physical and mechanical Properties of spray Material
A small amount of fibers are added in the cement base material, and the fibers can absorb larger energy when the cement base material is stressed by utilizing the characteristics of larger tensile strength and fracture toughness of the fibers, so that the crack propagation speed of the cement base body is reduced, and cracks generated by internal stress of mortar and concrete are effectively controlled, thereby improving the impermeability and durability of the cement base material; the addition of the fiber can greatly improve the tensile property of the cement-based material and improve the breaking strength, and the toughness can be increased by dozens of times or hundreds of times; meanwhile, the size of the section of the structure can be reduced, so that the brittleness of the spraying material is reduced, the toughness is increased, the crack resistance is obviously improved and the structure is light with the addition of the polypropylene fiber.
If the consistency of the spraying material is controlled, after the mixing amount of the polypropylene fibers is increased, the construction workability of the spraying material is deteriorated, therefore, the same working degree is achieved by adopting a mode of fixing the water-cement ratio, and the influence of the polypropylene fibers with different mixing amounts on the physical and mechanical properties of the mortar is analyzed (1.5% of rubber powder, 0.2% of thickening agent HPMC and 0.25% of water reducing agent are added in the formula).
TABLE 4 influence of the amount of polypropylene fibers on the physical and mechanical properties of the mortar
As can be seen from Table 4, when the water consumption is the same, the fluidity of the mortar is reduced and the difference of the wet density is not large along with the increase of the mixing amount of the polypropylene fibers. In the experimental process, the workability of mortar is poor when the fiber content is more, and therefore, the polypropylene fiber has adverse effect on the construction workability of the spraying material.
As the fiber loading increases: (1) the compressive strengths of 7d and 28d tended to decrease. (2) The flexural strength of 7d and 28d tends to increase and decrease. When the mixing amount is not more than 1.5 per mill, the flexural strength tends to increase; when the mixing amount is more than 1.5 per mill, the flexural strength is reduced. (3) The fold ratios of 7d and 28d tend to decrease and then increase. When the fiber content is 1.5 per mill, the 28d folding ratio of the mortar reaches the maximum value of 0.258. Therefore, the content of the polypropylene fiber was determined to be 1.5 ‰. Under the mixing amount, the spraying material has high breaking strength, large breaking-compression ratio, good toughness, good construction workability and insignificant reduction of compressive strength.
Example 4 formulation determination of roadway thin layer sealing Material
Through the material formulation test, the ratio of the finally determined test spray material is shown in table 5. The material has the performance and mechanical properties shown in Table 6, can meet the requirement of spraying sealing, and plays a role in preventing the surrounding rock from weathering and cracking and deforming.
TABLE 5 thin layer sealing Material formulation
TABLE 6 thin layer sealing Material Properties
Claims (10)
1. The roadway guniting material is prepared from the following components:
cement, quartz sand, a water reducing agent, a thickening agent, rubber powder and fibers;
the mass ratio of the cement to the quartz sand is 1: 2.
2. the roadway guniting material according to claim 1, wherein: the cement is portland cement.
3. The roadway guniting material according to claim 1 or 2, wherein: the quartz sand is a mixture of medium sand and fine sand;
the medium sand is 20-40 meshes of quartz sand, river sand or aeolian sand;
the fine sand is quartz sand, river sand or aeolian sand of 40-80 meshes.
4. The roadway guniting material according to any one of claims 1-3, wherein: the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent;
the dosage of the water reducing agent is 0.1-0.3% of the total mass of the cement and the quartz sand.
5. The roadway guniting material according to any one of claims 1-4, wherein: the thickening agent is hydroxypropyl methyl cellulose;
the amount of the thickening agent is 0.1-0.3% of the total mass of the cement and the quartz sand.
6. The roadway guniting material according to any one of claims 1-5, wherein: the rubber powder is re-dispersible latex powder;
the dosage of the rubber powder is 1-2% of the total mass of the cement and the quartz sand.
7. The roadway guniting material according to claim 6, wherein: the redispersible rubber powder can be ethylene-vinyl acetate copolymer rubber powder, ethylene-vinyl chloride-vinyl orthosilicate ternary copolymer rubber powder, vinyl acetate-ethylene-higher fatty acid vinyl ester ternary copolymer rubber powder or acrylate-styrene copolymer rubber powder.
8. The roadway guniting material according to any one of claims 1-7, wherein: the fiber is polypropylene short fiber, and the length of the fiber is 5-20 mm;
the dosage of the fiber is 0.1-0.15 per mill of the total mass of the cement and the quartz sand.
9. The construction method of the roadway guniting material according to any one of claims 1 to 8, comprising the steps of:
adding water into the roadway guniting material, and stirring to obtain a paste material; and pumping the paste material to a spray gun, wherein the spray gun is connected with compressed air, and the paste material is sprayed to the surface of the roadway by taking the compressed air as power.
10. The construction method according to claim 9, wherein: the using amount of the water is 15-30% of the mass of the roadway guniting material;
the stirring time is 1-5 minutes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115557762A (en) * | 2022-10-13 | 2023-01-03 | 太原理工大学 | Flame-retardant air leakage-proof electrostatic non-reaction environment-friendly sealing and reinforcing composite thin spraying material |
| CN115849812A (en) * | 2022-11-30 | 2023-03-28 | 辰龙新材料科技发展(山东)有限公司 | Micro-nanofiber toughened cement-based spraying material and preparation method thereof |
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| KR20070019701A (en) * | 2004-02-13 | 2007-02-15 | 에파주 티피 | Ultra-high-performance, self-compacting concrete, preparation method thereof and use of same |
| CN101092047A (en) * | 2006-06-19 | 2007-12-26 | 淄博矿业集团有限责任公司 | Dry mixing gunite material in use for underworkings of coal mine, and preparation method |
| CN109721301A (en) * | 2018-12-18 | 2019-05-07 | 山西晟坤科技发展有限公司 | A kind of dry-mixed gunite material |
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2021
- 2021-03-17 CN CN202110289763.2A patent/CN112830746A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070019701A (en) * | 2004-02-13 | 2007-02-15 | 에파주 티피 | Ultra-high-performance, self-compacting concrete, preparation method thereof and use of same |
| CN101092047A (en) * | 2006-06-19 | 2007-12-26 | 淄博矿业集团有限责任公司 | Dry mixing gunite material in use for underworkings of coal mine, and preparation method |
| CN109721301A (en) * | 2018-12-18 | 2019-05-07 | 山西晟坤科技发展有限公司 | A kind of dry-mixed gunite material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115557762A (en) * | 2022-10-13 | 2023-01-03 | 太原理工大学 | Flame-retardant air leakage-proof electrostatic non-reaction environment-friendly sealing and reinforcing composite thin spraying material |
| CN115557762B (en) * | 2022-10-13 | 2023-06-16 | 太原理工大学 | Flame-retardant, air-leakage-resistant, static, non-reactive and environment-friendly sealing and reinforcing composite thin spray material |
| CN115849812A (en) * | 2022-11-30 | 2023-03-28 | 辰龙新材料科技发展(山东)有限公司 | Micro-nanofiber toughened cement-based spraying material and preparation method thereof |
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