CN111548097A - High-strength corrosion-resistant dry spraying material for coal mine tunnel and construction process thereof - Google Patents
High-strength corrosion-resistant dry spraying material for coal mine tunnel and construction process thereof Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 38
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Classifications
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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
- C04B28/02—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 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
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Ceramic Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the technical field of coal mine roadway spraying materials, and particularly discloses a high-strength corrosion-resistant dry spraying material for a coal mine roadway and a construction process thereof, wherein the spraying material comprises, by mass, 15% -30% of cement, 20% -40% of sand, 20% -30% of stones, 5% -10% of coal ash, 10% -15% of mineral powder, 5% -10% of silica fume and 0.5-1.5 kg/m3The mixed fiber is two or more than two of steel fiber, glass fiber, carbon fiber or polypropylene fiber, and the lengths of the fibers are different. The gunning material obtained by adopting the proportion in the patent can still keep better strength when used in an acid corrosion environment of a coal mine roadway, and can meet the requirements of high stress, large soft rock deformation, rock burst and high-corrosivity coal mine roadway support.
Description
Technical Field
The invention relates to the technical field of coal mine roadway spraying materials, in particular to a high-strength corrosion-resistant dry spraying material for a coal mine roadway and a construction process thereof.
Background
At present, coal resource mining in China enters a deep mining stage, one of the problems encountered in the deep mining stage is that the ground stress level is increased to cause difficulty in maintaining a roadway, and the surrounding rock of the roadway shows the characteristics of large deformation, impact damage and the like under the action of high stress; meanwhile, in geological structure areas such as certain faults and fold curves, structural stress and self-weight stress are superposed, and damage to the roadway is aggravated. In the last decade, the level of coal mining equipment is greatly improved, and high-efficiency mining technologies such as large-mining-height fully mechanized mining and large-mining-height fully mechanized caving improve the mining strength to an unprecedented level, so that the mining stress is stronger, and in addition, in order to adapt to the fully mechanized mining and the fully mechanized caving mining, the section and the span of a roadway need to be increased, and the difficulty of roadway support is also increased.
The dry spraying process includes mixing dry mixture in certain proportion mechanically, feeding the mixture to conveying pipe with sprayer and air compressor, and spraying the mixture to the sprayed surface. The dry-method spraying technology is used for roadway support, and the bonding performance and the overall common working performance of a secondary combined interface of a support structure are improved in the aspect of a support mechanism; the shrinkage of the sprayed material is compensated by chemical expansion generated by the sprayed material from the aspect of construction technology, and the problem that the sprayed material cannot be compact in place in the construction process is solved; the method overcomes the defect of much rebound of the sprayed material by optimally controlling the water-cement ratio of the sprayed material, scientific spraying program, reasonable spraying thickness and other measures.
As the main battlefield of coal development in China is transferred to the Mongolian region, more middle-age Jurassic and Chalkbrook strata are encountered, the strata have higher mud content, poor cementation, water softening and high expansibility, nonlinear large deformation is presented, and roadway support is quite difficult. In addition, the underground water of the coal mine in China has complex components, and the underground water of some coal mines has high sulfur content and salt content, so that the corrosion of a supporting structure is aggravated, the service life of the supporting structure is shortened, and potential safety hazards are brought. The existing common dry-spraying material has a series of problems of low strength, poor corrosion resistance, high rebound rate and the like, and the requirements of high stress, large deformation of soft rock, rock burst and high-corrosivity coal mine roadway support are difficult to meet. Therefore, the research and development of the high-strength and corrosion-resistant dry spraying material for the coal mine tunnel and the construction process thereof are imperative, and meet the long-term development requirement of the coal industry.
Disclosure of Invention
The invention provides a high-strength and corrosion-resistant dry-spraying material for a coal mine roadway and a construction process thereof, and aims to solve the problems that a common spraying material is low in strength, poor in corrosion resistance and high in rebound rate, and is difficult to meet the requirements of high stress, large soft rock deformation, rock burst and high-corrosion coal mine roadway support.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the high-strength corrosion-resistant dry spraying material for the coal mine roadway comprises, by mass, 15% -30% of cement, 20% -40% of sand, 20% -30% of stones, 5% -10% of coal ash, 10% -15% of mineral powder, 5% -10% of silica fume and 0.5-1.5 kg/m3The cement additive is 2-20 percent, the hybrid fiber is two or more than two of steel fiber, glass fiber, carbon fiber or polypropylene fiber, and the lengths of different fibers are different.
The technical principle and the effect of the technical scheme are as follows:
1. the strength of 1d of the spray material obtained after the raw materials are mixed in the scheme is more than 10MPa after the spray material is sprayed in a dry spraying mode, and more than 45MPa after 28d, and the simulation corrosion experiment result shows that the compression strength corrosion resistance coefficient is 1.25 after 28d, and is still more than 1 after 100d, which shows that the spray material has excellent corrosion resistance, can still keep better strength when used in the acidic corrosion environment of a coal mine tunnel, and can meet the requirements of high stress, large deformation of soft rock, rock burst and high-corrosion coal mine tunnel support.
2. In the scheme, the idea of designing the composite material is reflected by adding the hybrid fiber into the spraying material, and the crack resistance, the toughness and the impermeability of the spraying material are greatly improved, so that the spraying material can better meet the requirements of novel building materials. The mixed fiber has the advantages that if single fiber is adopted to reinforce or toughen the sprayed material, some defects which are difficult to overcome exist all the time, such as the single selection of steel fiber, although the strength is high, the volume content of the steel fiber is limited, the dispersion and the stirring are difficult, and the brittleness is also large; in addition, if the polypropylene fiber is singly selected, although the polypropylene fiber has low elasticity and high ductility and can improve the toughness of the sprayed material, the reinforcing effect is not obvious, and the strength can not meet the use requirement. Therefore, the problems can be avoided by selecting the hybrid fiber, so that the strength of the sprayed material can be improved, and the toughness of the sprayed material can be improved.
Another advantage of using the hybrid fiber is that the hybrid fiber has different densities due to different types of fibers with different lengths, so the distribution of the hybrid fiber in the spraying material is different during stirring, and the hybrid fiber has different buoyancy in the spraying material due to different densities, so the hybrid fiber is easy to disperse and not easy to aggregate during stirring, and the hybrid fiber is difficult to entangle due to different lengths and lengths of the hybrid fiber, so the hybrid fiber is not easy to agglomerate.
3. The addition of the fly ash, the mineral powder and the silica fume in the scheme can enhance the corrosion resistance and the anti-sulfuration capability of the spraying material, for example, the fly ash contains a large amount of active SiO2And Al2O3Hydration products Ca (OH) with cement inside the spray2And the alkaline substances are subjected to secondary hydration reaction to generate gelled substances such as calcium silicate hydrate and calcium aluminate, which can reinforce the spraying material, and the gelled substances can permeate into cracks of the spraying material to fill the cracks, so that the permeation of sulfides is hindered, and the corrosion resistance is improved.
Further, the selected grade of the cement is P.O 42.5.5, 52.5, 62.5 or 62.5R.
Has the advantages that: the cement with the marks has higher compressive strength, the 28d compressive strength exceeds 40 +/-5 MPa, and the specific surface area is largerLarge, usually not less than 377m2And the pressure per kilogram (Kg) meets the use requirements of severe environments such as chloride pollution corrosion, sulfate corrosion, high humidity and the like.
Furthermore, the sand is sandstone machine-made sand, the mass proportion of the sand passing through a 0.3mm screen is 25-50%, and the mass proportion of the sand passing through a 1mm screen is 25-50%.
Has the advantages that: when the sand is mixed with water and other raw materials, the sand can play a role of lubrication during pumping. The reason is that the mortar composed of the sand, other raw materials and water enables the sand to play a role of lubrication and ball-like among coarse aggregates and can reduce the friction force among the coarse aggregates, so that the fluidity of the sprayed material is enhanced along with the increase of the fineness of the sand, namely the particle size, in a certain range, but the sand fineness continues to increase after reaching a certain degree to cause the wrapping property of the sprayed material slurry to be poor, and simultaneously the fluidity is reduced, so that the fineness of the sand can ensure the good fluidity of the slurry in a certain range, and the proportion of 25 to 50 percent of the mass of the sand passing through a 0.3mm screen and 25 to 50 percent of the mass of the sand passing through a 1mm screen is the proportion of the best fluidity in the dry spraying process obtained by long-term exploration of the inventor.
Furthermore, the stones are sandstone rock, the mud content is lower than 1%, the strength is not less than 80MPa, and the maximum particle size is not more than 10mm, wherein the particle size of the stones is 7mm < Ds <10mm and accounts for 45-50%, and the particle size of Ds <7mm and accounts for 40-45%.
Has the advantages that: the stones with the grain size are not easy to block the pipe in the pumping process.
Further, the fly ash is I-grade fly ash, and the specific surface area is not less than 366m2Per kg, the fineness is less than 11 percent, and the specific gravity is 2.0-3.0.
Has the advantages that: the grade I fly ash has low fineness and high specific surface area, can better react with hydration products of cement, and fills gaps in slurry.
Further, the ore powder is S95-grade ore powder, and the specific surface area is not less than 450m2Kg, density of 2.2-3.8 g/cm3。
Has the advantages that: the mineral powder can enhance the corrosion resistance and the anti-vulcanization capability of the spray material, and along with the continuous increase of internal reaction products, cracks in the spray material are continuously filled, so that a plurality of excellent performances of the spray material, such as the compressive strength, the anti-permeability capability and the like, are enhanced.
Further, the specific surface area of the silica fume is not less than 20900m2/kg，SiO2The content of the active carbon is more than or equal to 95 percent, and the specific gravity is 2.1.
Has the advantages that: the silica fume can fill the pores among cement particles, simultaneously generates gel with hydration products, and reacts with alkaline material magnesium oxide in the cement to generate the gel, so that the compression resistance, the folding resistance, the seepage resistance, the corrosion resistance, the impact resistance and the wear resistance of the spray material after solidification can be obviously improved, the service life of the spray material can be obviously prolonged, and the durability of the spray material can be improved by one time or even several times especially under severe environments such as chloride pollution corrosion, sulfate corrosion, high humidity and the like.
Further, the length of the hybrid fiber is 2mm to 30 mm.
Has the advantages that: in the spraying material in this scheme of one side was used for the coal mine tunnel, the coal mine tunnel was narrower usually, and adopted 2mm ~ 30 mm's chopped strand for the tunnel surface is more leveled smooth, if adopts the longer length of length to cut the fibre on the contrary, then can make the spraying material rear surface coarse, causes the danger of fish tail to past staff. On the other hand, if the long fibers are used, the fibers are likely to have a large number of contact points, and therefore, the fibers are not likely to be dispersed during mixing and stirring, and are likely to be entangled into a mass, which may reduce the reinforcing effect of the fibers on the sprayed material.
Further, the cement additive comprises, by mass, 0.2% -0.5% of a high-efficiency water reducing agent, 0.05% -0.25% of an air-entraining water reducing agent, 0.05% -1% of phosphate, 0.05% -0.25% of a high-strength agent, 0.05% -0.25% of an oxide inorganic salt, 0.05% -0.25% of an expanding agent, 0.05% -1% of a stabilizing agent, 0.05% -0.5% of an antifoaming agent, 0.05% -2.5% of a common accelerating agent, 0.05% -3.5% of a curing agent, 0.05% -2.5% of an antifreezing agent, 0.05% -2% of a thickening agent, 0.5% -2% of a spray material anti-sulfate corrosion agent, 0.5% -2.5% of a spray material anti-chloride ion corrosion agent and 0.25% -1% of an alkali-free or low-alkali accelerating agent.
Has the advantages that: (1) the high-efficiency water reducing agent in the scheme can greatly reduce the mixing water consumption of the sprayed material, and obviously improve the strength and durability of the sprayed material. (2) The air-entraining water reducing agent can introduce uniform micro bubbles, obviously reduce the surface tension of the sprayed material, improve the workability of the sprayed material, reduce bleeding and segregation, and improve the impermeability, freeze resistance, durability and the like of the sprayed material. (3) The phosphate can inhibit or reduce the electrochemical reaction between the sprayed material and the reinforcing steel bar after the harmful substances are invaded into the sprayed material. (4) The addition of the expanding agent can compensate the self-shrinkage of the sprayed material, improve the self-stress and prevent the water penetration and leakage caused by the shrinkage and cracking of the sprayed material. (5) The additive has the main functions of accelerating the setting and hardening speed of the sprayed material, reducing rebound loss, preventing the sprayed material from falling off due to gravity, increasing the once spraying thickness and shortening the interval time between spraying layers. (6) The spraying material corrosion-resistant corrosion inhibitor can make the spraying material have good performances of salt ion corrosion resistance, freeze-thaw cycle damage resistance, high permeation resistance and the like. Is particularly suitable for projects which require both corrosion resistance and impermeability to material spraying buildings.
The application also provides a construction process of the high-strength and corrosion-resistant dry-spraying material for the coal mine roadway, which comprises the following steps:
step 1: stirring and mixing the raw materials to obtain a dry spraying material;
step 2: a material spraying injection machine is adopted for injection, air is firstly supplied, then water is supplied, and then material is fed, the air pressure is not lower than 0.4MPa, the water pressure is higher than the air pressure by 0.1MPa in the material spraying process, and the ratio of water to dry spraying material is 0.35-0.45; the spray head is vertical to the sprayed surface, the distance between the spray head and the sprayed surface is controlled to be 0.6-1.0 m, and the spray track of the spray head is spiral.
Has the advantages that: by adopting the construction process, the rebound rate during spray construction can be effectively controlled, wherein the rebound rate during horizontal spray is controlled to be below 15%, and the rebound rate during upward spray is controlled to be below 25%.
Drawings
FIG. 1 is a graph showing the strength of a spray prepared according to the formulation of example 1 of the present invention as a function of age;
FIG. 2 is a graph showing the change of elastic modulus with age of a spray prepared according to the formulation of example 1 of the present invention;
FIG. 3 is a graph showing the change of the compressive strength and corrosion resistance coefficient of the spray material prepared by the blending ratio of example 1 of the invention with age;
FIG. 4 is a graph showing the change of the diffusion depth of chloride ions with age of the spray prepared according to the formulation of example 1 of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
the high-strength corrosion-resistant dry spraying material for the coal mine roadway comprises, by mass, 15% -30% of cement, 20% -40% of sand, 20% -30% of stones, 5% -10% of coal ash, 10% -15% of mineral powder, 5% -10% of silica fume and 0.5-1.5 kg/m3The mixed fiber is 2 mm-30 mm short cut fiber, the mixed fiber is two or more of steel fiber, glass fiber, carbon fiber or polypropylene fiber, and the lengths of different fibers are different.
Wherein the cement is selected from P.O 42.5.5, 52.5, 62.5 or 62.5R, and the specific surface area of the cement is not less than 377m2The compressive strength of the steel wire/Kg and 28d exceeds 40 +/-5 MPa; the sand is the sand produced by a sandstone machine, the mass proportion of the sand passing through a 0.3mm screen is 15-30%, and the mass proportion of the sand passing through a 1mm screen is 5-10%; the pebbles are sandstone rock, the mud content is lower than 1%, the strength is not less than 80MPa, the maximum grain diameter is not more than 10mm, wherein the grain diameter of the pebbles is 7mm<Ds<45-50% of 10mm and Ds<7mm accounts for 40-45%.
The fly ash is I-class fly ash, and the specific surface area is not less than 366m2Per kg, the fineness is less than 11%, and the specific gravity is 2.0-3.5; the mineral powder is S95 grade mineral powder, and the specific surface area is not less than 450m2Kg, density 2.9g/cm3(ii) a The specific surface area of the silica fume is not less than 20900m2/kg，SiO2The content of the active carbon is more than or equal to 95 percent, and the specific gravity is 2.1.
The cement additive comprises, by mass, 0.2-0.5% of a high-efficiency water reducing agent, 0.05-0.25% of an air entraining water reducing agent, 0.05-1% of phosphate, 0.05-0.25% of a high-strength agent, 0.05-0.25% of an oxide inorganic salt, 0.05-0.25% of an expanding agent, 0.05-1% of a stabilizer, 0.05-0.5% of a defoaming agent, 0.05-2.5% of a common accelerator, 0.05-3.5% of a curing agent, 0.05-2.5% of an antifreezing agent, 0.05-2% of a thickening agent, 0.5-2% of a spray material anti-sulfate corrosion preservative, 0.5-2.5% of a spray material anti-chloride ion corrosion preservative and 0.25-1% of an alkali-free or low-alkali accelerator. Wherein the high-efficiency water reducing agent can be selected from lignosulfonate, polycyclic aromatic salt or water-soluble resin sulfonate.
The specific mixture ratio of the raw materials in examples 1-12 of the high-strength corrosion-resistant dry-spraying material for the coal mine roadway is shown in tables 1 and 2.
Table 1 shows the raw material ratios of examples 1 to 6
Table 2 shows the raw material ratios of examples 7 to 12
In addition, the application also provides a construction process of the high-strength corrosion-resistant dry-spraying material for the coal mine roadway.
The construction process comprises the following steps:
step 1: the raw materials in the proportions shown in table 1 or table 2 were mixed by a forced mixer to obtain a uniform dry spray.
Step 2: the method comprises the following steps of performing dry spraying on the rock surface of a coal mine tunnel by using a material spraying sprayer, wherein when the spraying operation is started, the air supply is performed firstly, then the machine is started, water is supplied, and then the material is fed, wherein in the spraying process, the air pressure is kept to be not lower than 0.4MPa, the water pressure is higher than the air pressure by about 0.1MPa, and the ratio of water to sprayed material is 0.35-0.45; during operation, a spray head of the sprayer is vertical to a sprayed surface, the distance between the spray head and the sprayed surface is controlled to be 0.6-1.0 m, the spray head moves in a spiral track (the diameter is about 300mm) in a way of pressing a circle and a half circle to ensure the flatness of the surface of sprayed materials, in addition, the spray head adopts a multi-layer spraying mode, and the thickness of each layer of sprayed materials is 50-70 mm; the spraying interval time of each layer is kept within 2 h.
The rebound rate of the sprayed material is detected in the process of spraying the sprayed material, the rebound rate of the obtained roadway side wall does not exceed 20%, and the rebound rate of the roadway arch does not exceed 30%, so that the rebound rate is low when the sprayed material is sprayed by a dry spraying process.
In order to prove the high strength and the corrosion resistance of the spray material in the application, 4 groups are listed in addition to carry out comparative experiments on the proportion:
comparative example 1: the difference from example 1 is that only one steel fiber was added in comparative example 1.
Comparative example 2: the difference from example 1 is that only one glass fiber was added in comparative example 2.
Comparative example 3: the difference from example 1 is that only one carbon fiber was added in comparative example 3.
Comparative example 4: the difference from example 1 is that only one polypropylene fiber was added in comparative example 4.
Experimental testing
1. Strength test
The spray material obtained in the step 1 is prepared according to the raw material ratio of the examples 1 to 12 and the comparative examples 1 to 4, a test piece is manufactured by adopting a spray large plate method (300mm multiplied by 100mm) according to the standard of the test method of the mechanical property of common concrete (GB/T50081-2002), after spraying is finished, a film is coated, the maintenance is carried out for 1d, then the mold is removed, the test piece is moved to a standard maintenance room (20 +/-2 ℃, RH is more than 95%) for maintenance, the test piece is cut when the age is 1d, 3d, 7d, 28d, 90d and 180d respectively, a standard cube with the size of 100mm multiplied by 100mm is cut, 3 pieces are counted in each group, and the compression strength test is carried out on 18 test pieces in total.
The detection shows that the strength of the sprayed material prepared by adopting the mixture ratio in the application is developed quickly in the early stage of spraying, the strength of 1d after spraying reaches more than 10MPa, the strength of 1d after spraying reaches more than 45MPa after 28d, the compressive strength and the elastic modulus of the sprayed material are obviously superior to those of the common sprayed material, the detection result shows that the strength of the sprayed material obtained in the comparative examples 1-4 is reduced to a certain extent, the strength of 1d after spraying is lower than 9MPa, and the strength of the sprayed material is about 40MPa after 28d, because single fibers are difficult to disperse in the sprayed material, are easy to agglomerate and have no obvious effect on strengthening the sprayed material. Taking example 1 as an example, the change rule of the detected intensity with age is shown in fig. 1, and the change rule of the elastic modulus with age is shown in fig. 2.
2. Corrosion resistance test
The spray materials obtained in the step 1 are mixed according to the mixture ratio of the examples 1 to 12 and the comparative examples 1 to 4, test pieces are manufactured by adopting a spray plate method (300mm multiplied by 100mm) according to the standard of the test method of the mechanical property of common concrete (GB/T50081-2002), and are maintained in a standard maintenance room, and the test pieces are cut for corrosion resistance tests when the age is 0d, 28d, 60d, 90d and 120d respectively.
Preparing a composite corrosion solution simulating strong acid salt of underground water, wherein the pH value of the solution is 2 and the solution mainly contains Na+、H+、Cl-、SO4 2-Plasma, soaking and corroding test pieces of different ages in pure water and simulated groundwater, wherein the pH value adjusting method of the corrosive solution comprises the following steps: the etching solution was changed every three days for the first two weeks, and concentrated sulfuric acid was used to adjust the pH of the solution at later ages.
The method for evaluating the corrosion resistance of the test piece comprises the following steps: and (3) representing the change of the corrosion resistance of the test piece through the compression strength corrosion resistance coefficient (K) and the chloride ion diffusion depth (D) of the test piece. The calculation formula of the compressive strength corrosion resistance coefficient (K) is as follows:
in the formula:
k is the compression resistance and corrosion resistance coefficient;
fcorrosive liquidAnd the compressive strength, MPa, of the test piece after being soaked in simulated underground water corrosive solution for a certain age.
fAqueous solutionThe compressive strength, MPa, of the test piece after the same age period of immersion in pure water.
The compressive strength corrosion resistance coefficient and the chloride ion diffusion depth of the test piece obtained in different ages are detected, the compressive strength corrosion resistance coefficient of the spray material obtained by adopting the mixture ratio in the application is 1.25 after 28d and still more than 1 after 100d, and the diffusion depth of the spray material at 28d is 1.0mm, and the diffusion depth of 120d is not more than 2.5mm, so that the spray material shows good corrosion resistance.
Taking the detection result of the example 1 as an example, the change rule of the compressive strength corrosion resistance coefficient along with the age is shown in fig. 3, and the change rule of the chloride ion diffusion depth along with the age of the concrete is shown in fig. 4, and it can be observed from fig. 3 and fig. 4 that the decrease trend of the compressive strength corrosion resistance coefficient is more gradual along with the extension of the age of the test piece, which indicates that the test piece has good corrosion resistance. In addition, the change rule of the diffusion depth of the chloride ions along with the age of the test piece shows that the diffusion depth of the chloride ions in the concrete increases along with the age, but the diffusion rate is gradually reduced, and the excellent corrosion resistance is also shown.
The foregoing is merely an example of the present invention and common general knowledge of the known specific materials and characteristics thereof has not been described herein in any greater extent. It should be noted that, for those skilled in the art, without departing from the scope of the invention, several variations and modifications can be made, which should also be regarded as the protection scope of the invention, and these will not affect the effect of the implementation of the invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The utility model provides a coal mine tunnel is with high strength, corrosion-resistant dry blasting material which characterized in that: the material comprises, by mass, 15-30% of cement, 20-40% of sand, 20-30% of pebbles, 5-10% of coal ash and 10-15% of orePowder, 5 to 10 percent of silica fume and 0.5 to 1.5kg/m3The cement additive is 2-20 percent, the hybrid fiber is two or more than two of steel fiber, glass fiber, carbon fiber or polypropylene fiber, and the lengths of different fibers are different.
2. The high-strength corrosion-resistant dry spraying material for the coal mine roadway according to claim 1, which is characterized in that: the selected grade of the cement is P.O 42.5.5, 52.5, 62.5 or R62.5.
3. The high-strength corrosion-resistant dry spraying material for the coal mine roadway according to claim 1, which is characterized in that: the sand is the sand manufactured by a sandstone machine, the mass proportion of the sand passing through a 0.3mm screen is 25-50%, and the mass proportion of the sand passing through a 1mm screen is 25-50%.
4. The high-strength corrosion-resistant dry spraying material for the coal mine roadway according to claim 1, which is characterized in that: the stones are sandstone rock, the mud content is lower than 1%, the strength is not less than 80MPa, the maximum particle size is not more than 10mm, wherein the stone particle size is 7mm < Ds <10mm and accounts for 45-50%, and the stone particle size is 7mm < Ds <10mm and accounts for 40-45%.
5. The high-strength corrosion-resistant dry spraying material for the coal mine roadway according to claim 1, which is characterized in that: the fly ash is I-grade fly ash, and the specific surface area is not less than 366m2Per kg, the fineness is less than 11 percent, and the specific gravity is 2.0-3.0.
6. The high-strength corrosion-resistant dry spraying material for the coal mine roadway according to claim 1, which is characterized in that: the mineral powder is S95 grade mineral powder, and the specific surface area is not less than 450m2Kg, density of 2.2-3.8 g/cm3。
7. The high-strength corrosion-resistant dry spraying material for the coal mine roadway according to claim 1, which is characterized in that: the specific surface area of the silica fume is not less than 20900m2Kg, SiO in silica fume2The content of (A) is more than or equal to 95 wt.%, and the specific gravity is 2.1.
8. The high-strength corrosion-resistant dry spraying material for the coal mine roadway according to claim 1, which is characterized in that: the length of the hybrid fiber is 2 mm-30 mm.
9. The high-strength corrosion-resistant dry spraying material for the coal mine roadway according to claim 1, which is characterized in that: the cement additive comprises, by mass, 0.2-0.5% of a high-efficiency water reducing agent, 0.05-0.25% of an air-entraining water reducing agent, 0.05-1% of phosphate, 0.05-0.25% of a high-strength agent, 0.05-0.25% of an oxide inorganic salt, 0.05-0.25% of an expanding agent, 0.05-1% of a stabilizer, 0.05-0.5% of an antifoaming agent, 0.05-2.5% of a common accelerator, 0.05-3.5% of a curing agent, 0.05-2.5% of an antifreezing agent, 0.05-2% of a thickening agent, 0.5-2% of a spray material anti-sulfate corrosion inhibitor, 0.5-2.5% of a spray material anti-chloride ion corrosion inhibitor and 0.25-1% of an alkali-free or low-alkali accelerator.
10. The construction process of the high-strength corrosion-resistant dry spraying material for the coal mine roadway according to any one of claims 1 to 9 is characterized in that: the method comprises the following steps:
step 1: stirring and mixing the raw materials to obtain a dry spraying material;
step 2: a material spraying injection machine is adopted for injection, air is firstly supplied, then water is supplied, and then material is fed, the air pressure is not lower than 0.4MPa, the water pressure is higher than the air pressure by 0.1MPa in the material spraying process, and the ratio of water to dry spraying material is 0.35-0.45; the spray head is vertical to the sprayed surface, the distance between the spray head and the sprayed surface is controlled to be 0.6-1.0 m, and the spray track of the spray head is spiral.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142413A (en) * | 2020-09-29 | 2020-12-29 | 汤阴县玉丰商混搅拌有限公司 | Premixed dry powder pouring concrete |
| CN113149544A (en) * | 2021-03-13 | 2021-07-23 | 祎禾科技有限公司 | Low-brittleness high-curing high-performance concrete spray slurry for coal mine tunnel and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110045889A (en) * | 2009-10-28 | 2011-05-04 | 코오롱건설주식회사 | A Polyamide fiber having two layer for reinforcing cement structure |
| CN103626444A (en) * | 2012-08-27 | 2014-03-12 | 沈保国 | Construction process of steel fiber shotcrete |
| CN108046712A (en) * | 2018-01-15 | 2018-05-18 | 中国建筑科学研究院 | High-strength low-resilience-rate sprayed concrete and construction process thereof |
-
2020
- 2020-06-11 CN CN202010531254.1A patent/CN111548097A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110045889A (en) * | 2009-10-28 | 2011-05-04 | 코오롱건설주식회사 | A Polyamide fiber having two layer for reinforcing cement structure |
| CN103626444A (en) * | 2012-08-27 | 2014-03-12 | 沈保国 | Construction process of steel fiber shotcrete |
| CN108046712A (en) * | 2018-01-15 | 2018-05-18 | 中国建筑科学研究院 | High-strength low-resilience-rate sprayed concrete and construction process thereof |
Non-Patent Citations (6)
| Title |
|---|
| 余洪汇等: "矿物掺合料在喷射混凝土中的应用研究", 《河南建材》 * |
| 余洪汇等: "矿物掺合料在喷射混凝土中的应用研究", 《河南建材》, no. 1, 20 January 2009 (2009-01-20), pages 71 - 72 * |
| 佟钰等: "《混凝土混合料》", vol. 1, 31 January 2016, 哈尔滨工业大学出版社, pages: 74 - 75 * |
| 牛伯羽等: "《土木工程材料》", 31 January 2019, 中国质检出版社, pages: 187 - 190 * |
| 王少江等: "有机粗纤维及其与钢纤维混杂喷射混凝土的性能研究", 《中国水利学会第四届青年科技论坛论文集》 * |
| 王少江等: "有机粗纤维及其与钢纤维混杂喷射混凝土的性能研究", 《中国水利学会第四届青年科技论坛论文集》, 27 March 2009 (2009-03-27), pages 1 - 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142413A (en) * | 2020-09-29 | 2020-12-29 | 汤阴县玉丰商混搅拌有限公司 | Premixed dry powder pouring concrete |
| CN113149544A (en) * | 2021-03-13 | 2021-07-23 | 祎禾科技有限公司 | Low-brittleness high-curing high-performance concrete spray slurry for coal mine tunnel and preparation method thereof |
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