CN107686286B - Preparation method and application of dry powder mortar for plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete - Google Patents
Preparation method and application of dry powder mortar for plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete Download PDFInfo
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/386—Carbon
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1022—Non-macromolecular compounds
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1037—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
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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
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
Abstract
The invention provides a preparation method and application of dry powder mortar for plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete, wherein the preparation method specifically comprises the following steps: oxidizing pitch carbon fibers in air and performing impregnation treatment on the pitch carbon fibers by using a toluene solution containing epoxy resin to obtain pretreated pitch carbon fibers; crushing rubber powder, activating by low-temperature plasma and treating by using a silane coupling agent aqueous solution to obtain activated rubber powder; stirring asphalt carbon fibers and active rubber powder to form a mixed modifier, slowly stirring cement, a mineral admixture and fine aggregate, then sequentially adding the mixed modifier, a water-reducing slump-retaining component, a foaming component and a cohesive modifier, and quickly stirring to obtain the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete. The dry powder mortar for the self-compacting concrete prepared by the invention has excellent elasticity and modulus and low-temperature durability, and can be used in the fields of slab ballastless tracks, traffic track engineering, building engineering and the like.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a preparation method and application of dry powder mortar for slab ballastless track asphalt carbon fiber cement-based self-compacting concrete.
Background
Along with the rapid development of the construction technology of the high-speed railway in China, the no-scale track has wide application and development. The common concrete has the defects of poor ductility, low tensile strength, large shrinkage deformation, easy brittle failure and the like, is easy to damage and seep water, and is difficult to meet the demand of the zeza-free track. Compared with common concrete, the self-compacting high-performance concrete has higher fluidity, can not generate phenomena of segregation, bleeding and the like in the pouring process, can be filled with the template only by relying on dead weight, avoids the original defects of the hardened concrete, has excellent durability and good mechanical property, and therefore has the advantages of excellent working performance and excellent durability, and the track slab has low manufacturing cost, convenient construction and simple structure.
The self-compacting mortar is prepared from cement, mineral admixture, high-efficiency water reducing agent and fine aggregate according to a certain water-cement ratio, and has the defects of high cost, high early hydration heat, large amount of fine aggregate, easiness in cracking and the like due to large using amounts of gelled substances and additives, so that the self-compacting mortar is difficult to use in a large range. The Chinese patent CN 102503250B discloses a self-compacting mortar combination and a preparation method thereof, the self-compacting mortar combination comprises water, cement, fly ash, sand, melamine admixture, polyacrylamide efficient part non-dispersing agent, UWB-II type underwater non-dispersing agent and flocculating agent, the mortar combination prepared by the method can be used for preparing self-compacting mortar with different gap widths according to different geological conditions, the cost is reduced, and the self-compacting mortar combination is suitable for deep hole curtain grouting with underground water. Chinese patent CN 105016675B discloses a preparation method of high-volume-doped waste glass powder self-compacting mortar with good volume stability, waste glass is screened, cleaned and ball-milled until the average particle size is less than 15 mu m, the waste glass replaces 40-50% of cement, the waste glass, the cement, fine aggregate and lithium salt are prepared to form a gelled material, the gelled material, yarn and mixing water containing anhydrous sulfate are mixed to form mortar, and finally a high-efficiency water reducing agent and lithium salt are added to form the high-volume-doped glass powder self-compacting mortar. From the prior art, in order to reduce the cost of the self-compacting mortar, a low-cost substitute of the mortar raw material can be found, but the performance of the self-compacting mortar has certain performance due to the difference of the performance of the substitute, so that it is necessary to find the optimal low-cost substitute to prepare the self-compacting mortar with stable and excellent performance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method and application of dry powder mortar for slab ballastless track asphalt carbon fiber cement-based self-compacting concrete. The dry powder mortar for the self-compacting concrete prepared by the invention has excellent elasticity and modulus and low-temperature durability, and can be used in the fields of slab ballastless tracks, traffic track engineering, building engineering and the like.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a preparation method of dry powder mortar for plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete is characterized by comprising the following steps: the method comprises the following steps:
(1) oxidizing the pitch carbon fiber in air at 360-400 ℃ for 1-2h, then soaking the pitch carbon fiber in toluene solution containing epoxy resin, taking out the pitch carbon fiber, and drying and curing the pitch carbon fiber at 100-110 ℃ for 20-30min to obtain the pretreated pitch carbon fiber;
(2) further crushing the rubber powder, sieving the crushed rubber powder by a sieve of 100-150 meshes, uniformly spreading the crushed rubber powder, activating the crushed rubber powder by low-temperature plasma, soaking the crushed rubber powder in a silane coupling agent aqueous solution, and drying and curing the soaked rubber powder for 20-30min at the temperature of 100-110 ℃ to obtain activated rubber powder;
(3) according to the weight parts, 0.01-0.5 part of asphalt carbon fiber and 1-5 parts of active rubber powder are stirred to uniformly disperse the asphalt carbon fiber and the active rubber powder to form a mixed modifier, then 100 parts of cement, 20-100 parts of mineral admixture and 100-600 parts of fine aggregate are slowly stirred for 1-2min, then the mixed modifier, 0.1-5 parts of water-reducing slump-retaining component, 0.2-10 parts of foaming component and 0.1-10 parts of cohesion regulator are sequentially added, and the mixture is quickly stirred for 5-10min to obtain the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete; the foaming components comprise a tea saponin foaming agent and sucrose in a mass ratio of 50:1-3, and the cohesion regulator comprises the components in a mass ratio of 1-5: 10: 0.5 UEA bulking agent, polycarboxylic acid viscosity modifier, and methyl cellulose.
Preferably, in the step (1), the mass fraction of the epoxy resin in the toluene solution containing the epoxy resin is 0.5 to 1%, and the dipping time is 30 to 60 min.
Preferably, in the step (1), the degree of crystallite orientation of the pretreated pitch carbon fibers is higher than 90%, and the carbon content is higher than 99.8%.
Preferably, in the step (2), the power of the low-temperature plasma activation treatment is 300-500W, and the time is 1-3 min.
Preferably, in the step (2), the silane coupling agent in the aqueous solution of the silane coupling agent is KH-550, the mass fraction is 0.2-0.5%, and the dipping time is 30-60 min.
Preferably, in the step (3), the mineral admixture is fly ash, slag and silicon powder in a mass ratio of 1:0.5: 0.1.
Preferably, in the step (3), the fine aggregate is one or a mixture of more of river sand, ceramic sand and artificial sand with a water content of less than 1% and a fineness modulus of less than 2.6, and the water-reducing slump-retaining component is a polyacrylic acid type high-efficiency water reducing agent.
The invention also provides application of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete, which is characterized in that the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete prepared by adopting any one of the preparation methods is used in the fields of traffic track engineering and building engineering.
As a preferable aspect of the above technical solution, the application method is: in a mixing plant or a construction site, dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete is mixed with coarse aggregate and water, and the mixture is prepared by forced stirring to form a self-compacting concrete mixture, wherein the coarse aggregate is a rockfill material.
Compared with the prior art, the invention has the following beneficial effects:
(1) the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete comprises active rubber powder, wherein the rubber powder is particle powder formed by physical crushing, the internal cross-linked structure is not completely damaged, the surface is in an inert state, the adhesive force with a matrix is reinforced, and the blending compatibility is poor.
(2) The prepared dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete comprises pretreated asphalt carbon fibers which are anisotropic fibers, fiber macromolecules form a molecular network, the elastic modulus of the self-compacting concrete can be improved, and the fatigue resistance of the concrete is improved, but the traditional asphalt carbon fibers have large surface inertia, lack of chemical active functional groups, poor wettability with a matrix and low bonding strength with the matrix.
(3) The dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete comprises a foaming component, a foaming system formed by the foaming component and a filler has large influence on the strength, the dry shrinkage rate and the water absorption rate of the concrete, the invention selects a tea saponin foaming agent and sucrose as the foaming component, the tea saponin is an excellent natural non-ionic surfactant, the foaming agent has strong foaming power in an aqueous solution, the foaming is lasting and stable, and the defoaming is difficult, the polyhydroxy compound sucrose can form glycoprotein with the tea saponin in a covalent bond form, the viscosity of a foaming liquid film is increased, the foaming stability is further improved, and the foaming agent greatly improves the low-temperature durability while improving the elasticity of the self-compacting concrete.
(4) The dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete prepared by the invention has good elasticity, high modulus, good fluidity and good self-compacting effect, also has low-temperature durability, and can be used in the fields of slab ballastless tracks, traffic track engineering, building engineering and the like.
Detailed Description
The present invention will be described in detail with reference to specific embodiments, which are illustrative of the invention and are not to be construed as limiting the invention.
Example 1:
the preparation method of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete comprises the following steps:
(1) oxidizing the pitch carbon fiber in air at 360 ℃ for 1h, then soaking the pitch carbon fiber in toluene solution containing 0.5% of epoxy resin for 30min, taking out the pitch carbon fiber, drying and curing the pitch carbon fiber at 100-DEG C for 20min to obtain the pretreated pitch carbon fiber with the crystallite orientation degree higher than 90% and the carbon content higher than 99.8%.
(2) Further crushing the rubber powder, sieving the crushed rubber powder with a 100-mesh sieve, uniformly spreading the crushed rubber powder, activating the crushed rubber powder by low-temperature plasma for 1min under the power of 300W, soaking the crushed rubber powder in 0.2% aqueous solution of a silane coupling agent KH-550 for 30min, and drying and curing the soaked rubber powder for 20min at the temperature of 100 ℃ to obtain activated rubber powder.
(3) According to the weight parts, 0.5 part of asphalt carbon fiber and 1 part of active rubber powder are stirred to uniformly disperse the asphalt carbon fiber and the active rubber powder to form a mixed modifier, then 100 parts of cement, 20 parts of a mineral admixture of fly ash, slag and silicon powder with the mass ratio of 1:0.5:0.1, and 100 parts of river sand, ceramic sand and artificial sand fine aggregate with the water content of less than 1% and the fineness modulus of less than 2.6 are slowly stirred for 1min, and then the mixed modifier, 0.1 part of polyacrylic acid type high-efficiency water reducing agent, 0.2 part of tea saponin foaming agent with the mass ratio of 50:1 and 0.2 part of foaming component of cane sugar, 1: 10: 0.5 part of UEA expanding agent, 0.1 part of polycarboxylic acid viscosity regulator and 0.1 part of methyl cellulose viscosity regulator, and quickly stirring for 5min to obtain the dry powder mortar for the plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete.
Example 2:
the preparation method of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete comprises the following steps:
(1) oxidizing the pitch carbon fiber in air at 400 ℃ for 2h, then soaking the pitch carbon fiber in toluene solution containing 1% of epoxy resin for 60min, taking out the pitch carbon fiber, and drying and curing the pitch carbon fiber at 110 ℃ for 30min to obtain the pretreated pitch carbon fiber with the crystallite orientation degree higher than 90% and the carbon content higher than 99.8%.
(2) Further crushing the rubber powder, sieving the crushed rubber powder with a 150-mesh sieve, uniformly spreading the crushed rubber powder, activating the crushed rubber powder by low-temperature plasma for 3min under the power of 500W, soaking the crushed rubber powder in 0.5% aqueous solution of a silane coupling agent KH-550 for 30-60min, and drying and curing the soaked rubber powder for 30min at the temperature of 110 ℃ to obtain activated rubber powder.
(3) According to the weight parts, 0.5 part of asphalt carbon fiber and 5 parts of active rubber powder are stirred to uniformly disperse the asphalt carbon fiber and the active rubber powder to form a mixed modifier, then 100 parts of cement, 100 parts of a mineral admixture of fly ash, slag and silicon powder with the mass ratio of 1:0.5:0.1, 600 parts of river sand, ceramic sand and artificial sand fine aggregate with the water content of less than 1% and the fineness modulus of less than 2.6 are slowly stirred for 1-2min, and then the mixed modifier, 5 parts of polyacrylic acid type high-efficiency water reducing agent, 10 parts of tea saponin foaming agent and 10 parts of sucrose with the mass ratio of 50:3 are sequentially added, 5: 10: and (3) 0.5 part of UEA expanding agent, 10 parts of polycarboxylic acid viscosity regulator and 10 parts of methyl cellulose viscosity regulator, and quickly stirring for 10min to obtain the dry powder mortar for the plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete.
Example 3:
the preparation method of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete comprises the following steps:
(1) oxidizing the pitch carbon fiber in air at 380 ℃ for 1.5h, then soaking the pitch carbon fiber in a toluene solution containing 0.6% of epoxy resin for 40min, taking out the pitch carbon fiber, and drying and curing the pitch carbon fiber at 105 ℃ for 25min to obtain the pretreated pitch carbon fiber with the crystallite orientation degree higher than 90% and the carbon content higher than 99.8%.
(2) Further crushing the rubber powder, sieving the crushed rubber powder with a 110-mesh sieve, uniformly spreading the crushed rubber powder, activating the crushed rubber powder by low-temperature plasma for 2min under the power of 400W, soaking the crushed rubber powder in 0.3% aqueous solution KH-550 of a silane coupling agent for 45min, and drying and curing the soaked rubber powder for 25min at the temperature of 110 ℃ to obtain activated rubber powder.
(3) Stirring 0.05 part of asphalt carbon fiber and 3 parts of active rubber powder according to parts by weight, uniformly dispersing the asphalt carbon fiber and the active rubber powder to form a mixed modifier, slowly stirring 100 parts of cement, 50 parts of a mineral admixture of fly ash, slag and silicon powder in a mass ratio of 1:0.5:0.1 and 300 parts of river sand fine aggregate with a water content of less than 1% and a fineness modulus of less than 2.6 for 1.5min, then sequentially adding the mixed modifier, 0.5 part of polyacrylic acid type high-efficiency water reducing agent, 1 part of tea saponin foaming agent in a mass ratio of 50:12 and 1 part of foaming component of cane sugar, 2: 10: and (3) quickly stirring 1 part of 0.5 UEA expanding agent, 1 part of polycarboxylic acid viscosity regulator and 1 part of methyl cellulose viscosity regulator for 6min to obtain the dry powder mortar for the plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete.
Example 4:
the preparation method of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete comprises the following steps:
(1) oxidizing the pitch carbon fiber in air at 390 ℃ for 2h, then soaking the pitch carbon fiber in a toluene solution containing 0.8% of epoxy resin for 50min, taking out the pitch carbon fiber, and drying and curing the pitch carbon fiber at 110 ℃ for 20min to obtain the pretreated pitch carbon fiber with the crystallite orientation degree higher than 90% and the carbon content higher than 99.8%.
(2) Further crushing the rubber powder, sieving the crushed rubber powder with a 150-mesh sieve, uniformly spreading the crushed rubber powder, activating the crushed rubber powder by low-temperature plasma for 1.5min under the power of 450W, soaking the crushed rubber powder in 0.4% aqueous solution of silane coupling agent KH-550 for 50min, and drying and curing the soaked rubber powder for 30min at the temperature of 100 ℃ to obtain activated rubber powder.
(3) Stirring 0.01 part of asphalt carbon fiber and 2 parts of active rubber powder according to parts by weight, uniformly dispersing the asphalt carbon fiber and the active rubber powder to form a mixed modifier, slowly stirring 100 parts of cement, 50 parts of a mineral admixture of fly ash, slag and silicon powder in a mass ratio of 1:0.5:0.1, 400 parts of ceramic sand and artificial sand fine aggregate with the water content of less than 1% and the fineness modulus of less than 2.6 for 1min, and then sequentially adding 3 parts of the mixed modifier, 3 parts of polyacrylic acid type high-efficiency water reducing agent, 3 parts of tea saponin foaming agent and 3 parts of foaming component of cane sugar in a mass ratio of 50:1, 2: 10: and (3) quickly stirring 5 parts of 0.5 UEA expanding agent, 5 parts of polycarboxylic acid viscosity regulator and 5 parts of methyl cellulose viscosity regulator for 10min to obtain the dry powder mortar for the plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete.
Example 5:
the preparation method of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete comprises the following steps:
(1) oxidizing the pitch carbon fiber in air at 400 ℃ for 1h, then soaking the pitch carbon fiber in toluene solution containing 1% of epoxy resin for 30min, taking out the pitch carbon fiber, and drying and curing the pitch carbon fiber at 110 ℃ for 20min to obtain the pretreated pitch carbon fiber with the crystallite orientation degree higher than 90% and the carbon content higher than 99.8%.
(2) Further crushing the rubber powder, sieving the crushed rubber powder with a 150-mesh sieve, uniformly spreading the crushed rubber powder, activating the crushed rubber powder by low-temperature plasma for 3min under the power of 300W, soaking the crushed rubber powder in 0.2% aqueous solution of a silane coupling agent KH-550 for 60min, and drying and curing the soaked rubber powder for 30min at the temperature of 100 ℃ to obtain activated rubber powder.
(3) Stirring 0.5 part of asphalt carbon fiber and 1 part of active rubber powder according to parts by weight, uniformly dispersing the asphalt carbon fiber and the active rubber powder to form a mixed modifier, slowly stirring 100 parts of cement, 100 parts of a mineral admixture of fly ash, slag and silicon powder in a mass ratio of 1:0.5:0.1, 600 parts of river sand and artificial sand fine aggregate with the water content of less than 1% and the fineness modulus of less than 2.6 for 1min, and then sequentially adding 10 parts of the mixed modifier, 5 parts of polyacrylic acid type high-efficiency water reducing agent, 10 parts of tea saponin foaming agent and sucrose in a mass ratio of 50:1, 1: 10: and (3) quickly stirring 10 parts of 0.5 UEA expanding agent, 10 parts of polycarboxylic acid viscosity regulator and 10 parts of methyl cellulose viscosity regulator for 5min to obtain the dry powder mortar for the plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete.
Example 6:
the preparation method of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete comprises the following steps:
(1) oxidizing the pitch carbon fiber in air at 360 ℃ for 2h, then soaking the pitch carbon fiber in a toluene solution containing 0.5% of epoxy resin for 60min, taking out the pitch carbon fiber, and drying and curing the pitch carbon fiber at 100 ℃ for 30min to obtain the pretreated pitch carbon fiber with the crystallite orientation degree higher than 90% and the carbon content higher than 99.8%.
(2) Further crushing the rubber powder, sieving the crushed rubber powder with a 100-mesh sieve, uniformly spreading the crushed rubber powder, activating the crushed rubber powder by low-temperature plasma for 1min under the power of 500W, soaking the crushed rubber powder in 0.5% aqueous solution of a silane coupling agent KH-550 for 30min, and drying and curing the soaked rubber powder for 20min at the temperature of 110 ℃ to obtain activated rubber powder.
(3) According to the weight parts, 0.5 part of asphalt carbon fiber and 1 part of active rubber powder are stirred to uniformly disperse the asphalt carbon fiber and the active rubber powder to form a mixed modifier, then 100 parts of cement, 100 parts of a mineral admixture of fly ash, slag and silicon powder with the mass ratio of 1:0.5:0.1, and 100 parts of river sand, ceramic sand and artificial sand fine aggregate with the water content of less than 1% and the fineness modulus of less than 2.6 are slowly stirred for 2min, and then the mixed modifier, 0.1 part of polyacrylic acid type high-efficiency water reducing agent, 0.2 part of tea saponin foaming agent with the mass ratio of 50:3 and 0.2 part of foaming component of cane sugar, 1: 10: and (3) quickly stirring 5 parts of 0.5 UEA expanding agent, 5 parts of polycarboxylic acid viscosity regulator and 5 parts of methyl cellulose viscosity regulator for 10min to obtain the dry powder mortar for the plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete.
Comparative example 1:
the preparation method of the dry powder mortar for the slab ballastless track cement-based self-compacting concrete comprises the following steps:
(1) further crushing the rubber powder, sieving the crushed rubber powder with a 100-mesh sieve, uniformly spreading the crushed rubber powder, activating the crushed rubber powder by low-temperature plasma for 1min under the power of 300W, soaking the crushed rubber powder in 0.2% aqueous solution of a silane coupling agent KH-550 for 30min, and drying and curing the soaked rubber powder for 20min at the temperature of 100 ℃ to obtain activated rubber powder.
(2) According to the weight parts, after 100 parts of cement, 20 parts of mineral admixture of fly ash, slag and silicon powder with the mass ratio of 1:0.5:0.1, and 100 parts of river sand, ceramic sand and artificial sand fine aggregate with the water content of less than 1% and the fineness modulus of less than 2.6 are slowly stirred for 1min, 1 part of active rubber powder, 0.1 part of polyacrylic acid type high-efficiency water reducing agent, 0.2 part of tea saponin foaming agent and sucrose with the mass ratio of 50:1, 1: 10: 0.5 of UEA expanding agent, 0.1 part of polycarboxylic acid viscosity regulator and 0.1 part of methyl cellulose viscosity regulator, and quickly stirring for 5min to obtain the dry powder mortar for the slab ballastless track cement-based self-compacting concrete.
Comparative example 2:
the preparation method of the dry powder mortar for the slab ballastless track cement-based self-compacting concrete comprises the following steps:
(1) oxidizing the pitch carbon fiber in air at 360 ℃ for 1h, then soaking the pitch carbon fiber in toluene solution containing 0.5% of epoxy resin for 30min, taking out the pitch carbon fiber, drying and curing the pitch carbon fiber at 100-DEG C for 20min to obtain the pretreated pitch carbon fiber with the crystallite orientation degree higher than 90% and the carbon content higher than 99.8%.
(2) According to the weight parts, after 100 parts of cement, 20 parts of mineral admixture of fly ash, slag and silicon powder with the mass ratio of 1:0.5:0.1, and 100 parts of river sand, ceramic sand and artificial sand fine aggregate with the water content of less than 1% and the fineness modulus of less than 2.6 are slowly stirred for 1min, 0.5 part of asphalt carbon fiber, 0.1 part of polyacrylic acid type high-efficiency water reducing agent, 0.2 part of tea saponin foaming agent with the mass ratio of 50:1 and foaming component of cane sugar are sequentially added, and the weight ratio of the foaming component is 1: 10: 0.5 of UEA expanding agent, 0.1 part of polycarboxylic acid viscosity regulator and 0.1 part of methyl cellulose viscosity regulator, and quickly stirring for 5min to obtain the dry powder mortar for the slab ballastless track cement-based self-compacting concrete.
Through detection, the results of the working performance of the concrete prepared by the dry powder mortar for the asphalt carbon fiber cement-based self-compacting concrete of the plate-type ballastless track prepared in the examples 1 to 6 and the dry powder mortar for the cement-based self-compacting concrete of the plate-type ballastless track prepared in the comparative example are as follows:
as can be seen from the above table, the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete prepared by the invention has good fluidity and can realize self-compacting performance, and the prepared concrete has good elasticity and modulus and low-temperature durability.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A preparation method of dry powder mortar for plate-type ballastless track asphalt carbon fiber cement-based self-compacting concrete is characterized by comprising the following steps: the method comprises the following steps:
(1) oxidizing the pitch carbon fiber in air at 360-400 ℃ for 1-2h, then soaking the pitch carbon fiber in toluene solution containing epoxy resin, taking out the pitch carbon fiber, and drying and curing the pitch carbon fiber at 100-110 ℃ for 20-30min to obtain the pretreated pitch carbon fiber;
(2) further crushing the rubber powder, sieving the crushed rubber powder by a sieve of 100-150 meshes, uniformly spreading the crushed rubber powder, activating the crushed rubber powder by low-temperature plasma, soaking the crushed rubber powder in KH550 aqueous solution with the mass concentration of 0.2-0.5% for 30-60min, and drying and curing the soaked rubber powder at 100-110 ℃ for 20-30min to obtain activated rubber powder; the power of the low-temperature plasma activation treatment is 300-500W, and the time is 1-3 min;
(3) mixing fly ash, slag and silicon powder in a mass ratio of 1:0.5:0.1 to prepare a mineral admixture; according to the weight parts, 0.01-0.5 part of asphalt carbon fiber and 1-5 parts of active rubber powder are stirred to uniformly disperse the asphalt carbon fiber and the active rubber powder to form a mixed modifier, then 100 parts of cement, 20-100 parts of mineral admixture and 100-600 parts of fine aggregate are slowly stirred for 1-2min, then the mixed modifier, 0.1-5 parts of water-reducing slump-retaining component, 0.2-10 parts of foaming component and 0.1-10 parts of cohesion regulator are sequentially added, and the mixture is quickly stirred for 5-10min to obtain the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete; the foaming components comprise a tea saponin foaming agent and sucrose in a mass ratio of 50:1-3, and the cohesion regulator comprises the components in a mass ratio of 1-5: 10: 0.5 UEA bulking agent, polycarboxylic acid viscosity modifier, and methyl cellulose.
2. The preparation method of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete according to claim 1, which is characterized by comprising the following steps: in the step (1), the mass fraction of the epoxy resin in the toluene solution containing the epoxy resin is 0.5-1%, and the impregnation time is 30-60 min.
3. The preparation method of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete according to claim 1, which is characterized by comprising the following steps: in the step (1), the crystallite orientation degree of the pretreated pitch carbon fiber is higher than 90%, and the carbon content is higher than 99.8%.
4. The preparation method of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete according to claim 1, which is characterized by comprising the following steps: in the step (3), the fine aggregate is one or a mixture of more of river sand, ceramic sand and artificial sand with the water content of less than 1% and the fineness modulus of less than 2.6, and the water-reducing slump-retaining component is a polyacrylic acid type high-efficiency water reducing agent.
5. The application of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete is characterized in that the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete prepared by the preparation method in any one of claims 1 to 4 is used in the fields of traffic track engineering and building engineering.
6. The application of the dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete according to claim 5 is characterized in that the application method comprises the following steps: in a mixing plant or a construction site, dry powder mortar for the slab ballastless track asphalt carbon fiber cement-based self-compacting concrete is mixed with coarse aggregate and water, and the mixture is prepared by forced stirring to form a self-compacting concrete mixture, wherein the coarse aggregate is a rockfill material.
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| CN109369116B (en) * | 2018-12-19 | 2021-08-13 | 广东工业大学 | Self-compacting concrete and preparation method thereof |
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| KR100892247B1 (en) * | 2007-11-09 | 2009-04-09 | 진도화성주식회사 | Environmentally friendly polyurethane cement composition |
| CN104030638A (en) * | 2014-06-16 | 2014-09-10 | 西南交通大学 | Rubber elastic self-compaction concrete for plate-type ballastless tracks |
| CN104030644A (en) * | 2014-06-09 | 2014-09-10 | 中国铁道科学研究院铁道建筑研究所 | Polymer cement mortar for slab ballastless track of high-speed railway |
| CN104402337A (en) * | 2014-11-20 | 2015-03-11 | 中国铁道科学研究院铁道建筑研究所 | Preparation and application of dry-mixed mortar for plate-type ballastless track self-compacting concrete |
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| KR100892247B1 (en) * | 2007-11-09 | 2009-04-09 | 진도화성주식회사 | Environmentally friendly polyurethane cement composition |
| CN104030644A (en) * | 2014-06-09 | 2014-09-10 | 中国铁道科学研究院铁道建筑研究所 | Polymer cement mortar for slab ballastless track of high-speed railway |
| CN104030638A (en) * | 2014-06-16 | 2014-09-10 | 西南交通大学 | Rubber elastic self-compaction concrete for plate-type ballastless tracks |
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