CN115215612A - Composite mortar for filling layer of plate-type ballastless track and preparation method thereof - Google Patents

Composite mortar for filling layer of plate-type ballastless track and preparation method thereof Download PDF

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CN115215612A
CN115215612A CN202210835719.1A CN202210835719A CN115215612A CN 115215612 A CN115215612 A CN 115215612A CN 202210835719 A CN202210835719 A CN 202210835719A CN 115215612 A CN115215612 A CN 115215612A
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stirring
parts
filling layer
composite mortar
reaction
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CN115215612B (en
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刘丽雯
张宏林
王元芳
赵国栋
刘小虎
丛思雨
李非凡
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Wuhan Railway Vocational College of Technology
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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
    • 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
    • C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
    • C04B24/42—Organo-silicon compounds
    • 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
    • C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • C04B28/06—Aluminous cements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
    • C08G65/2639—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing elements other than oxygen, nitrogen or sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/32—Polymers modified by chemical after-treatment
    • C08G65/329—Polymers modified by chemical after-treatment with organic compounds
    • C08G65/336—Polymers modified by chemical after-treatment with organic compounds containing silicon
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/40—Surface-active agents, dispersants
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • Polymers & Plastics (AREA)
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Abstract

The invention discloses composite mortar for a filling layer of a plate-type ballastless track and a preparation method thereof, wherein the composite mortar comprises the following raw materials in parts by weight: 260-360 parts of modified emulsified asphalt, 900-1100 parts of dry powder, 2-5 parts of a defoaming agent, 4-8 parts of a water reducing agent, 3-7 parts of a surfactant, 1-4 parts of triethanolamine and 200-300 parts of water. According to the composite mortar for the filling layer of the slab ballastless track, provided by the invention, the SBS glue powder is added into the emulsified asphalt, so that the low-temperature performance of the asphalt is improved, and the fluidity, the early strength, the stability and the weather resistance of the CA mortar are improved; meanwhile, the surfactant is added, so that the water resistance of the cement mortar is improved, the dispersibility of the emulsified asphalt in the cement mortar is improved, and the adhesive property of the track plate, the base plate and the filling layer is improved when the emulsified asphalt is used as the filling layer due to the reactive surfactant.

Description

Composite mortar for filling layer of plate-type ballastless track and preparation method thereof
Technical Field
The invention belongs to the technical field of high-speed railway construction materials, and particularly relates to composite mortar for a plate-type ballastless track filling layer and a preparation method thereof.
Background
The ballastless track is a ballast track bed with a good-integrity concrete or asphalt concrete bearing layer instead of a discrete body, compared with the ballast track, the ballastless track can meet the requirements of high-speed railways on high stability, high smoothness and high line utilization rate, and in order to improve the high stability, safety and smoothness of the track in high-speed driving and reduce the track maintenance amount, the ballastless track becomes the main direction of the development of the high-speed railways of various countries.
The plate-type ballastless track structure of the high-speed railway is divided into six parts from top to bottom, namely a steel rail, a base plate, a track plate, a filling layer, an isolation layer, a base plate and the like. In the six parts, the filling layer structure plays a crucial role and is also the part with the greatest technical difficulty in the construction of the slab ballastless track. The filling layer belongs to a post-construction structure, but the filling layer and the track slab which belongs to the prefabricated reinforced concrete structure on the upper layer are required to finally form an integral composite structure, and the filling layer and the track slab play a role in bearing and transferring power together. The deformation of the track slab and the turnout slab of the reinforced concrete structure is very small, and a CA mortar or self-compacting concrete filling layer constructed later is required to have high interface bonding strength and low shrinkage deformation performance, so that the CA mortar or self-compacting concrete filling layer is tightly combined with the track slab of the prefabricated reinforced concrete structure to keep the coordinated deformation performance. According to the current relevant theory and experimental research at home and abroad, the larger the roughness of the bottom surface of the track slab is, the larger the bonding and meshing action of the CA mortar or self-compacting concrete filling layer and the track slab is, and the better the cooperative working performance of the track slab and the filling layer is.
The slab track of the high-speed railway in China is found after running for several years, due to the action of environmental temperature, humidity, rainwater and dynamic load of a high-speed train, a cement emulsified asphalt mortar filling layer in a slab track structure is the most easily-premature-degraded and damaged component, particularly, the cement emulsified asphalt mortar filling layer in a CRTS II slab track structure is easily and prematurely degraded, the main degradation and damage forms of the cement emulsified asphalt mortar filling layer are provided with a gap between a track plate or a base plate or a supporting layer and the mortar filling layer, interface calcium corrosion, cracking, peeling and edge region fragmentation, and the degradation phenomena are related to water and the coupling effect of the water and the dynamic load of the train.
Chinese patent application 200510038284.4 discloses mortar for a plate-type track of a high-speed railway and a production process thereof, wherein the emulsifier content in emulsified asphalt used by the mortar is as high as 15.8%. Chinese patent application 201110042766.2 discloses a high-temperature-resistant cement emulsified asphalt mortar material, and in order to solve the construction problem at high temperature, chelating agent is used for complexing Ca generated by cement hydration in fresh mortar 2+ 、Mg 2+ The ions are not beneficial to the action of the molecules of the emulsifier on the surface of the asphalt coagulation film and the ions in the coagulation hardening of the cement emulsified asphalt mortar. In addition, the emulsified asphalt related in these patents or patent applications contains more nonionic emulsifier, which not only increases the hydrophilicity of the cement-emulsified asphalt mortar, but also increases the porosity of the cement-emulsified asphalt mortar, so that the water absorption rate is high and the water resistance is poor.
In order to improve the durability of the plate type track structure and ensure the safe operation of a high-speed railway and the comfortable operation of a high-speed train, the invention of hydrophobic cement emulsified asphalt mortar is urgently needed and is used for the pouring construction of a mortar filling layer in the plate type track structure of the high-speed railway.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the composite mortar for the slab ballastless track filling layer and the preparation method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
the composite mortar for the filling layer of the plate-type ballastless track comprises the following raw materials in parts by weight:
Figure BDA0003748014900000031
preferably, the preparation method of the modified emulsified asphalt comprises the following steps:
(1) Adding montmorillonite into distilled water, stirring at room temperature for 1-3h, adding octadecyl trimethyl ammonium chloride, refluxing at 60-80 deg.C for 2-4h, filtering, washing, and drying to obtain white solid; adding the obtained white solid into absolute ethyl alcohol, adding gamma-glycidoxypropyltrimethoxysilane and 2-hydroxy-4-n-octyloxybenzophenone, stirring for reaction, and performing rotary evaporation after the reaction is finished to obtain modified montmorillonite;
(2) Heating petroleum asphalt to be molten, then adding the petroleum asphalt into the modified montmorillonite obtained in the step (1), and performing shearing reaction in a dispersing emulsifying machine to obtain modified asphalt;
(3) Adding cellulose ether into water, uniformly stirring, then adding sodium fatty alcohol-polyoxyethylene ether sulfate, uniformly stirring, then regulating the pH value to 1-3 with hydrochloric acid to obtain a mixed solution, heating the modified asphalt obtained in the step (2) to be molten, adding the mixed solution and SBS rubber powder into a colloid mill, and emulsifying for 3-5min to obtain the modified emulsified asphalt.
Preferably, the mass ratio of the montmorillonite to the octadecyl trimethyl ammonium chloride to the gamma-glycidyl ether oxypropyl trimethoxy silane to the 2-hydroxy-4-n-octoxy benzophenone in the step (1) is (1-3); in the step (2), the mass ratio of the petroleum asphalt to the modified montmorillonite is 100-8, the shear reaction rotating speed is 3000-4000r/min, the temperature is 160-180 ℃, and the time is 1-2h; in the step (3), the mass ratio of the cellulose ether to the water to the sodium fatty alcohol ether sulfate to the modified asphalt to the SBS glue powder is 0.5-1.5.
Preferably, the dry powder is prepared by uniformly mixing the following raw materials in parts by weight: 70-90 parts of cement, 100-140 parts of fine sand, 30-60 parts of quartz sand, 0.5-2 parts of expanding agent and 0.03-0.05 part of aluminum powder.
The aluminum powder is preferably scale-shaped aluminum powder, and the scale-shaped aluminum powder is added to ensure that the volume of the mortar expands in the early hardening stage.
Preferably, the swelling agent is a magnesium oxide swelling agent; the cement is one or more of 42.5 common Portland cement, 52.5 common Portland cement, 42.5 fly ash cement and 42.5 quick-hardening sulphoaluminate cement; the fineness modulus of the fine sand is 1.6-2.2, and the average grain diameter is 0.15-0.25mm; the average grain diameter of the quartz sand is 1-2mm.
Preferably, the water reducing agent is a polycarboxylic acid powder water reducing agent; the defoaming agent is one or more of ethylene glycol, polyethylene glycol, propylene glycol and organic phosphate.
Preferably, the preparation method of the surfactant comprises the following steps:
(a) Adding polyhexafluoropropylene oxide monomethyl alcohol into acetone, then adding 3-isocyanate propyl trimethoxy silane and stannous isooctanoate, stirring for reaction, filtering after the reaction is finished, and then removing the acetone by rotary evaporation to obtain a product 1;
(b) And (b) adding the product 1 obtained in the step (a), gamma-aminopropyltriethoxysilane and tertiary carbonic acid glycidyl ester into a three-neck flask, then adding triphenylphosphine, stirring and reacting under the nitrogen condition, and obtaining the surfactant after the reaction is completed.
Preferably, the molar ratio of the polyhexafluoropropylene oxide monomethanol to the 3-isocyanatopropyltrimethoxysilane in the step (a) is 1-1.5, the stirring temperature is 60-70 ℃, and the stirring time is 2-4h; and (b) the product 1 in the step (b), gamma-aminopropyltriethoxysilane and 10 parts of tert-glycidyl carbonate are added in an amount of 2-4, wherein the stirring reaction temperature is 50-70 ℃, and the reaction time is 1-3h.
The invention also discloses a preparation method of the composite mortar for the slab ballastless track filling layer, which comprises the following steps:
weighing the raw materials according to the weight ratio, sequentially adding water, modified emulsified asphalt and a defoaming agent into a mortar stirrer, and stirring for the first time; and then adding the dry powder, the water reducing agent, the surfactant and the triethanolamine, stirring for the second time, reducing the rotating speed to 20-30rpm after stirring is finished, and stirring for 1-2min to obtain the composite mortar.
Preferably, the primary stirring speed is 30-40rpm, and the stirring time is 1-2min; the secondary stirring speed is 70-80rpm, and the stirring time is 4-8min.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the composite mortar for the filling layer of the slab ballastless track, provided by the invention, firstly, through modifying the montmorillonite, octadecyl trimethyl ammonium chloride enters the interlayer of the montmorillonite to carry out intercalation modification, so that the interlayer spacing of the montmorillonite is increased, on one hand, the uniformly dispersed montmorillonite layers can prolong the diffusion path of oxygen, prevent the permeation of harmful substances and the loss of volatile components, greatly increase the ageing resistance of emulsified asphalt, and on the other hand, the subsequent 2-hydroxy-4-n-octoxy benzophenone can enter the interlayer of the montmorillonite; then adding gamma-glycidoxypropyltrimethoxysilane, 2-hydroxy-4-n-octyloxybenzophenone and 2-hydroxy-4-n-octyloxybenzophenone, wherein the 2-hydroxy-4-n-octyloxybenzophenone has excellent ultraviolet resistance, the outdoor aging performance of the composite mortar can be greatly improved, and the added gamma-glycidoxypropyltrimethoxysilane is used for carrying out organic modification on the surface and the edge of a montmorillonite sheet layer, so that the purpose of changing the inherent hydrophilic property of the montmorillonite is achieved, the organic compatibility of the montmorillonite and the asphalt is improved, and the montmorillonite and the asphalt are combined more tightly; then blending the modified montmorillonite and asphalt to obtain primary modified asphalt; and finally, emulsifying the primary modified asphalt and the fatty alcohol-polyoxyethylene ether sodium sulfate, simultaneously adding SBS rubber powder to perform secondary modification on the asphalt, and synchronously performing emulsification and secondary modification, so that the emulsifier and the modifier are dispersed in the asphalt more uniformly, and the stability of the modified emulsified asphalt is improved.
(2) According to the composite mortar for the slab ballastless track filling layer, the reactive surfactant is added, the polyhexafluoropropylene oxide monomethyl alcohol and the 3-isocyanate propyl trimethoxy silane react to obtain the fluorine-containing silicon-containing compound with good hydrophobicity, and the carbon-fluorine bond in the polyhexafluoropropylene oxide monomethyl alcohol has a shielding effect on the main chain, so that the fluorine-containing silicon-containing compound has very high chemical inertness, oxidation resistance and radiation resistance; and then, gamma-aminopropyltriethoxysilane and tertiary carbonic acid glycidyl ester are added, and the gamma-aminopropyltriethoxysilane and the tertiary carbonic acid glycidyl ester react with a fluorine-containing silicon-containing compound, so that the obtained surfactant contains a reaction group which can be chemically combined with an inorganic material (cement mortar) and a group which can be chemically combined with an organic material (emulsified asphalt) in a molecule, has an important effect on improving the compatibility between an organic body and the inorganic body, improves the integral bonding performance of the composite mortar, and ensures the long-term weather resistance of the composite mortar.
(3) According to the composite mortar for the filling layer of the slab ballastless track, provided by the invention, the SBS rubber powder is added into the emulsified asphalt, so that the low-temperature performance of the asphalt is improved, and the fluidity, early strength, stability and weather resistance of the CA mortar are improved; meanwhile, the surfactant is added, so that the water resistance of the cement mortar is improved, the dispersibility of the emulsified asphalt in the cement mortar is improved, and the adhesive property of the track plate, the base plate and the filling layer is improved when the emulsified asphalt is used as the filling layer due to the reactive surfactant. Compared with the prior art, the composite mortar for the filling layer of the plate-type ballastless track has the characteristics of simple and convenient preparation process and simple equipment, and the ballastless track paved by the composite mortar has the advantages of prolonging the service life of the plate-type ballastless track of the high-speed railway and improving the safety of the high-speed railway.
Detailed Description
The technical solutions of the present invention will be described below clearly and completely in conjunction with the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The polycarboxylate powdery water reducer is purchased from the Liaoning Colon fine chemical industry Co., ltd, and has the brand number of SP409; the cellulose ether is purchased from Wuhan Runhing Source science and technology Limited company, is hydroxypropyl methyl cellulose and has the model of LH20M; the petroleum asphalt is No. 90 petroleum asphalt; the sodium fatty alcohol polyoxyethylene ether sulfate is purchased from Shandong Chinzhi chemical new materials Co., ltd; the polyhexafluoropropylene oxide mono-methanol is purchased from Hasford company, and has the molecular weight of 1000-1200; the glycidyl versatate is produced by Minhui Hui trading Co., ltd, nanjing, USA Miigu, and is named as Cardura E-10P.
Example 1
A preparation method of composite mortar for a filling layer of a plate-type ballastless track comprises the following steps:
weighing the raw materials according to the weight ratio, sequentially adding 200 parts of water, 260 parts of modified emulsified asphalt and 2 parts of ethylene glycol into a mortar stirrer, and stirring for 1min at 30 rpm; and then adding 900 parts of dry powder, 4 parts of polycarboxylic acid powder water reducing agent, 3 parts of surfactant and 1 part of triethanolamine, stirring for 4min at 70rpm, reducing the rotating speed to 30rpm after stirring is finished, and stirring for 1min to obtain the composite mortar.
The dry powder is prepared by uniformly mixing the following raw materials in parts by weight: 70 parts of cement, 100 parts of fine sand, 30 parts of quartz sand, 0.5 part of expanding agent and 0.03 part of aluminum powder; the swelling agent is a magnesium oxide swelling agent; the cement is 52.5 ordinary portland cement; the fineness modulus of the fine sand is 1.6, and the average grain diameter is 0.15mm; the average grain diameter of the quartz sand is 1mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Adding 100g of montmorillonite into 500mL of distilled water, stirring for 1h at room temperature, then adding 1g of octadecyl trimethyl ammonium chloride, carrying out reflux reaction for 4h at 60 ℃, and carrying out filtration, washing and drying treatment after the reaction is finished to obtain a white solid; adding the obtained white solid into 300mL of absolute ethanol, adding 0.5g of gamma-glycidyl ether oxypropyl trimethoxy silane and 10g of 2-hydroxy-4-n-octoxy benzophenone, stirring at 60 ℃ for reacting for 8 hours, and performing rotary evaporation to remove ethanol after the reaction is finished to obtain modified montmorillonite;
(2) Heating 100g of petroleum asphalt until the petroleum asphalt is molten, then adding the petroleum asphalt into the modified montmorillonite (3 g) obtained in the step (1), and carrying out shearing reaction in a dispersion emulsifying machine at the rotating speed of 3000r/min and the temperature of 160 ℃ for 2h to obtain modified asphalt;
(3) Adding 0.5g of cellulose ether into 30g of water, uniformly stirring, then adding 1g of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly stirring, then regulating the pH value to 1 with hydrochloric acid to obtain a mixed solution, heating the modified asphalt (60 g) obtained in the step (2) to 160 ℃ for melting, then adding the mixed solution and 5g of SBS rubber powder into a colloid mill, and emulsifying for 3min to obtain the modified emulsified asphalt.
The preparation method of the surfactant comprises the following steps:
(a) Adding 120g (molecular weight is 1000,0.12mol) of polyhexafluoropropylene oxide single methanol into 300mL of acetone, then adding 20.5g (0.1 mol) of 3-isocyanatopropyltrimethoxysilane and 1g of stannous isooctanoate, stirring and reacting for 4 hours at 60 ℃, filtering after the reaction is finished, and then rotationally evaporating the filtrate to remove acetone to obtain a product 1;
(b) And (b) adding the product 1 (100 g) in the step (a), 20g of gamma-aminopropyltriethoxysilane and 30g of tertiary carboxylic acid glycidyl ester into a three-neck flask, then adding 0.5g of triphenylphosphine, stirring and reacting for 3h at 50 ℃ under the condition of nitrogen, and obtaining the surfactant after the reaction is finished.
Example 2
A preparation method of composite mortar for a filling layer of a plate-type ballastless track comprises the following steps:
weighing the raw materials according to the weight ratio, sequentially adding 230 parts of water, 290 parts of modified emulsified asphalt and 3 parts of propylene glycol into a mortar stirrer, and stirring for 1.5min at 35 rpm; and then adding 950 parts of dry powder, 5 parts of polycarboxylic acid powder water reducing agent, 3 parts of surfactant and 2 parts of triethanolamine, stirring for 6min at 75rpm, reducing the rotating speed to 25rpm after stirring, and stirring for 1.5min to obtain the composite mortar.
The dry powder is prepared by uniformly mixing the following raw materials in parts by weight: 75 parts of cement, 110 parts of fine sand, 40 parts of quartz sand, 1 part of expanding agent and 0.04 part of aluminum powder; the swelling agent is a magnesium oxide swelling agent; the cement is 42.5 fly ash cement; the fineness modulus of the fine sand is 1.8, and the average grain diameter is 0.2mm; the average grain diameter of the quartz sand is 1.5mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Adding 100g of montmorillonite into 500mL of distilled water, stirring for 2h at room temperature, then adding 2g of octadecyl trimethyl ammonium chloride, carrying out reflux reaction for 3h at 70 ℃, and carrying out filtration, washing and drying treatment after the reaction is finished to obtain a white solid; adding the obtained white solid into 300mL of absolute ethanol, adding 1g of gamma-glycidyl ether oxypropyl trimethoxy silane and 12g of 2-hydroxy-4-n-octoxy benzophenone, stirring at 65 ℃ for reaction for 7 hours, and performing rotary evaporation to remove ethanol after the reaction is finished to obtain modified montmorillonite;
(2) Heating 100g of petroleum asphalt to be molten, then adding the petroleum asphalt into the modified montmorillonite obtained in the step (1) to perform shearing reaction in a dispersion emulsifying machine, wherein the shearing reaction speed is 3500r/min, the temperature is 170 ℃, and the time is 1.5h to obtain modified asphalt;
(3) Adding 1g of cellulose ether into 35g of water, uniformly stirring, then adding 2g of sodium fatty alcohol polyoxyethylene ether sulfate, uniformly stirring, then adjusting the pH value to 2 with hydrochloric acid to obtain a mixed solution, heating the modified asphalt (70 g) obtained in the step (2) to 170 ℃, melting, adding into a colloid mill, then adding the mixed solution and 7g of SBS rubber powder, and emulsifying for 4min to obtain the modified emulsified asphalt.
The preparation method of the surfactant comprises the following steps:
(a) Adding 143g (with the molecular weight of 1100,0.13mol) of polyhexafluoropropylene oxide monomethyl alcohol into 300mL of acetone, then adding 20.5g (0.1 mol) of 3-isocyanatopropyltrimethoxysilane and 2g of stannous isooctanoate, stirring and reacting for 3 hours at 65 ℃, filtering after the reaction is finished, and then rotationally evaporating the filtrate to remove acetone to obtain a product 1;
(b) And (b) adding the product 1 (100 g) obtained in the step (a), 30g of gamma-aminopropyltriethoxysilane and 40g of tertiary carbonic acid glycidyl ester into a three-neck flask, then adding 1g of triphenylphosphine, stirring and reacting for 2h at 60 ℃ under the condition of nitrogen, and obtaining the surfactant after the reaction is finished.
Example 3
A preparation method of composite mortar for a filling layer of a plate-type ballastless track comprises the following steps:
weighing the raw materials according to the weight ratio, sequentially adding 370 parts of water, 330 parts of modified emulsified asphalt and 4 parts of tributyl phosphate into a mortar stirrer, and stirring for 2min at 35 rpm; and then adding 1000 parts of dry powder, 7 parts of polycarboxylic acid powder water reducing agent, 3.5 parts of surfactant and 3 parts of triethanolamine, stirring for 7min at 75rpm, reducing the rotating speed to 25rpm after stirring is finished, and stirring for 2min to obtain the composite mortar.
The dry powder is prepared by uniformly mixing the following raw materials in parts by weight: 80 parts of cement, 130 parts of fine sand, 50 parts of quartz sand, 1.5 parts of expanding agent and 0.04 part of aluminum powder; the expanding agent is a magnesium oxide expanding agent; the 42.5 rapid hardening sulphoaluminate cement; the fineness modulus of the fine sand is 2, and the average particle size is 0.2mm; the average grain diameter of the quartz sand is 2mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Adding 100g of montmorillonite into 500mL of distilled water, stirring for 2h at room temperature, then adding 2g of octadecyl trimethyl ammonium chloride, carrying out reflux reaction for 2.5h at 70 ℃, and carrying out filtration, washing and drying treatment after the reaction is finished to obtain a white solid; adding the obtained white solid into 300mL of absolute ethanol, adding 1.5g of gamma-glycidyl ether oxypropyl trimethoxy silane and 14g of 2-hydroxy-4-n-octoxy benzophenone, stirring at 65 ℃ for reaction for 7 hours, and performing rotary evaporation to remove ethanol after the reaction is finished to obtain modified montmorillonite;
(2) Heating 100g of petroleum asphalt to be molten, then adding the petroleum asphalt into the modified montmorillonite (7 g) obtained in the step (1), and carrying out shearing reaction in a dispersion emulsifying machine, wherein the shearing reaction rotating speed is 3500r/min, the temperature is 175 ℃, and the time is 1.5h to obtain modified asphalt;
(3) Adding 1g of cellulose ether into 35g of water, uniformly stirring, then adding 2.5g of sodium fatty alcohol-polyoxyethylene ether sulfate, uniformly stirring, adjusting the pH value to 2.5 by using hydrochloric acid to obtain a mixed solution, heating 75g of the modified asphalt obtained in the step (2) to 170 ℃ for melting, then adding into a colloid mill, then adding into the mixed solution and 8g of SBS rubber powder, and emulsifying for 4min to obtain the modified emulsified asphalt.
The preparation method of the surfactant comprises the following steps:
(a) Adding 165g (molecular weight is 1100,0.15mol) of polyhexafluoropropylene oxide monomethyl alcohol into 300mL of acetone, then adding 20.5g (0.1 mol) of 3-isocyanatopropyl trimethoxy silane and 2.5g of stannous isooctanoate, stirring at 65 ℃ for reaction for 3h, filtering after the reaction is finished, and then rotationally evaporating the filtrate to remove acetone to obtain a product 1;
(b) And (b) adding the product 1 (100 g) obtained in the step (a), 35g of gamma-aminopropyltriethoxysilane and 45g of tertiary carbonic acid glycidyl ester into a three-neck flask, then adding 1.5g of triphenylphosphine, stirring and reacting for 2 hours at 65 ℃ under the condition of nitrogen, and obtaining the surfactant after the reaction is finished.
Example 4
A preparation method of composite mortar for a filling layer of a plate-type ballastless track comprises the following steps:
weighing the raw materials according to the weight ratio, sequentially adding 300 parts of water, 360 parts of modified emulsified asphalt and 5 parts of polyethylene glycol (PEG-200) into a mortar stirrer, and stirring at 40rpm for 1min; and then adding 1100 parts of dry powder, 8 parts of polycarboxylic acid powder water reducing agent, 4 parts of surfactant and 4 parts of triethanolamine, stirring for 4min at 80rpm, reducing the rotating speed to 30rpm after stirring, and stirring for 2min to obtain the composite mortar.
The dry powder is prepared by uniformly mixing the following raw materials in parts by weight: 90 parts of cement, 140 parts of fine sand, 60 parts of quartz sand, 2 parts of expanding agent and 0.05 part of aluminum powder; the expanding agent is a magnesium oxide expanding agent; the cement is 42.5 ordinary portland cement; the fineness modulus of the fine sand is 2.2, and the average particle size is 0.25mm; the average grain diameter of the quartz sand is 2mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Adding 100g of montmorillonite into 500mL of distilled water, stirring for 3h at room temperature, then adding 3g of octadecyl trimethyl ammonium chloride, carrying out reflux reaction for 2h at 80 ℃, and filtering, washing and drying after the reaction is finished to obtain a white solid; adding the obtained white solid into 300mL of absolute ethanol, adding 2g of gamma-glycidyl ether oxypropyl trimethoxy silane and 15g of 2-hydroxy-4-n-octoxy benzophenone, stirring at 70 ℃ for reacting for 8 hours, and performing rotary evaporation to remove ethanol after the reaction is finished to obtain modified montmorillonite;
(2) Heating 100g of petroleum asphalt to be molten, then adding the petroleum asphalt into the modified montmorillonite (8 g) obtained in the step (1), and carrying out shearing reaction in a dispersion emulsifying machine at the shearing reaction speed of 4000r/min and the temperature of 180 ℃ for 1h to obtain modified asphalt;
(3) Adding 1.5g of cellulose ether into 40g of water, uniformly stirring, then adding 3g of sodium fatty alcohol-polyoxyethylene ether sulfate, uniformly stirring, adjusting the pH value to 3 by using hydrochloric acid to obtain a mixed solution, heating 80g of the modified asphalt obtained in the step (2) to 180 ℃ for melting, adding into a colloid mill, adding into the mixed solution and 10g of SBS rubber powder, and emulsifying for 5min to obtain the modified emulsified asphalt.
The preparation method of the surfactant comprises the following steps:
(a) Adding 180g (with the molecular weight of 1200,0.15mol) of polyhexafluoropropylene oxide monomethyl alcohol into 300mL of acetone, then adding 20.5g (0.1 mol) of 3-isocyanatopropyl trimethoxy silane and 3g of stannous isooctanoate, stirring at 70 ℃ for reaction for 2h, filtering after the reaction is finished, and then carrying out rotary evaporation on the filtrate to remove acetone to obtain a product 1;
(b) And (b) adding the product 1 (100 g) in the step (a), 40g of gamma-aminopropyltriethoxysilane and 50g of tertiary carboxylic acid glycidyl ester into a three-neck flask, then adding 2g of triphenylphosphine, stirring and reacting for 1h at 70 ℃ under the condition of nitrogen, and obtaining the surfactant after the reaction is finished.
Comparative example 1
A preparation method of composite mortar for a filling layer of a plate-type ballastless track comprises the following steps:
weighing the raw materials according to the weight ratio, sequentially adding 200 parts of water, 260 parts of modified emulsified asphalt and 2 parts of glycol into a mortar stirrer, and stirring for 1min at 30 rpm; and then adding 900 parts of dry powder, 4 parts of polycarboxylic acid powder water reducing agent and 1 part of triethanolamine, stirring for 4min at 70rpm, reducing the rotating speed to 30rpm after stirring is finished, and stirring for 1min to obtain the composite mortar.
The dry powder is prepared by uniformly mixing the following raw materials in parts by weight: 70 parts of cement, 100 parts of fine sand, 30 parts of quartz sand, 0.5 part of expanding agent and 0.03 part of aluminum powder; the expanding agent is a magnesium oxide expanding agent; the cement is 52.5 ordinary portland cement; the fineness modulus of the fine sand is 1.6, and the average particle size is 0.15mm; the average grain diameter of the quartz sand is 1mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Adding 100g of montmorillonite into 500mL of distilled water, stirring for 1h at room temperature, then adding 1g of octadecyl trimethyl ammonium chloride, carrying out reflux reaction for 4h at 60 ℃, and filtering, washing and drying after the reaction is finished to obtain a white solid; adding the obtained white solid into 300mL of absolute ethanol, adding 0.5g of gamma-glycidyl ether oxypropyl trimethoxy silane and 10g of 2-hydroxy-4-n-octoxy benzophenone, stirring at 60 ℃ for reacting for 8 hours, and performing rotary evaporation to remove ethanol after the reaction is finished to obtain modified montmorillonite;
(2) Heating 100g of petroleum asphalt to be molten, then adding the petroleum asphalt into the modified montmorillonite (3 g) obtained in the step (1), and carrying out shearing reaction in a dispersion emulsifying machine at the rotating speed of 3000r/min and the temperature of 160 ℃ for 2h to obtain modified asphalt;
(3) Adding 0.5g of cellulose ether into 30g of water, uniformly stirring, then adding 1g of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly stirring, then regulating the pH value to 1 with hydrochloric acid to obtain a mixed solution, heating the modified asphalt (60 g) obtained in the step (2) to 160 ℃ for melting, then adding the mixed solution and 5g of SBS rubber powder into a colloid mill, and emulsifying for 3min to obtain the modified emulsified asphalt.
Comparative example 2
A preparation method of composite mortar for a filling layer of a plate-type ballastless track comprises the following steps:
weighing the raw materials according to the weight ratio, sequentially adding 200 parts of water, 260 parts of emulsified asphalt and 2 parts of glycol into a mortar stirrer, and stirring for 1min at 30 rpm; and then adding 900 parts of dry powder, 4 parts of polycarboxylic acid powder water reducing agent, 3 parts of surfactant and 1 part of triethanolamine, stirring for 4min at 70rpm, reducing the rotating speed to 30rpm after stirring is finished, and stirring for 1min to obtain the composite mortar.
The dry powder is prepared by uniformly mixing the following raw materials in parts by weight: 70 parts of cement, 100 parts of fine sand, 30 parts of quartz sand, 0.5 part of expanding agent and 0.03 part of aluminum powder; the swelling agent is a magnesium oxide swelling agent; the cement is 52.5 ordinary portland cement; the fineness modulus of the fine sand is 1.6, and the average particle size is 0.15mm; the average grain diameter of the quartz sand is 1mm.
The preparation method of the emulsified asphalt comprises the following steps:
adding 0.5g of cellulose ether into 30g of water, uniformly stirring, then adding 1g of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly stirring, adjusting the pH value to 1 by using hydrochloric acid to obtain a mixed solution, heating 60g of asphalt to 160 ℃ for melting, adding the melted asphalt into a colloid mill, adding the mixed solution, and emulsifying for 3min to obtain the emulsified asphalt.
The preparation method of the surfactant comprises the following steps:
(a) Adding 120g (molecular weight is 1000,0.12mol) of polyhexafluoropropylene oxide single methanol into 300mL of acetone, then adding 20.5g (0.1 mol) of 3-isocyanatopropyltrimethoxysilane and 1g of stannous isooctanoate, stirring and reacting for 4 hours at 60 ℃, filtering after the reaction is finished, and then rotationally evaporating the filtrate to remove acetone to obtain a product 1;
(b) And (b) adding the product 1 (100 g) in the step (a), 20g of gamma-aminopropyltriethoxysilane and 30g of tertiary carboxylic acid glycidyl ester into a three-neck flask, then adding 0.5g of triphenylphosphine, stirring and reacting for 3h at 50 ℃ under the condition of nitrogen, and obtaining the surfactant after the reaction is finished.
According to the requirements of temporary technical conditions of cement emulsified asphalt mortar for CRTS I type plate ballastless tracks of passenger dedicated lines (science and technology foundation [ 2008 ] 74), the composite mortar prepared in the examples 1-4 and the comparative examples 1-2 is subjected to performance test, the bonding strength of the interface of the composite mortar and concrete is tested according to the test result of the test method of the bonding strength between asphalt pavement layers in the appendix D of DB 34/T3840-2021, and the test result is as shown in the following table 1:
TABLE 1
Figure BDA0003748014900000171
As can be seen from the table 1, the composite mortar for the slab ballastless track filling layer, which is prepared by the invention, has the advantages that the fluidity, the workable time, the separation degree, the gas content, the apparent density, the slurry spreading rate, the expansion rate, the compressive strength (1 d, 7d and 28 d), the elastic modulus (28 d) and the weather resistance index all meet the technical requirements of the CRTS I type cement emulsified asphalt mortar, and meanwhile, the composite mortar also has excellent hydrophobicity, water absorption and the bonding strength with the concrete interface, can greatly relieve the diseases of separation, debonding, stripping, self cracking, crushing and the like of a track slab and a base slab, improves the water resistance of cement, and has good application prospect; compared with comparative example 1 in which no surfactant was added and comparative example 2 in which no modified emulsified asphalt was added, excellent properties were exhibited.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The composite mortar for the filling layer of the plate-type ballastless track is characterized by comprising the following raw materials in parts by weight:
Figure FDA0003748014890000011
2. the composite mortar for the filling layer of the slab ballastless track of claim 1, wherein the preparation method of the modified emulsified asphalt comprises the following steps:
(1) Adding montmorillonite into distilled water, stirring at room temperature for 1-3h, adding octadecyl trimethyl ammonium chloride, refluxing at 60-80 deg.C for 2-4h, filtering, washing, and drying to obtain white solid; adding the obtained white solid into absolute ethyl alcohol, adding gamma-glycidoxypropyltrimethoxysilane and 2-hydroxy-4-n-octyloxybenzophenone, stirring for reaction, and performing rotary evaporation after the reaction is finished to obtain modified montmorillonite;
(2) Heating petroleum asphalt to be molten, then adding the petroleum asphalt into the modified montmorillonite obtained in the step (1), and performing shearing reaction in a dispersing emulsifying machine to obtain modified asphalt;
(3) Adding cellulose ether into water, uniformly stirring, then adding sodium fatty alcohol-polyoxyethylene ether sulfate, uniformly stirring, then regulating the pH value to 1-3 with hydrochloric acid to obtain a mixed solution, heating the modified asphalt obtained in the step (2) to be molten, adding the mixed solution and SBS rubber powder into a colloid mill, and emulsifying for 3-5min to obtain the modified emulsified asphalt.
3. The composite mortar for the filling layer of the slab ballastless track according to claim 2, wherein in the step (1), the mass ratio of montmorillonite, octadecyl trimethyl ammonium chloride, gamma-glycidyl ether oxypropyl trimethoxysilane and 2-hydroxy-4-n-octoxy benzophenone is (1-3); in the step (2), the mass ratio of the petroleum asphalt to the modified montmorillonite is 100-8, the shear reaction rotating speed is 3000-4000r/min, the temperature is 160-180 ℃, and the time is 1-2h; in the step (3), the mass ratio of the cellulose ether, the water, the fatty alcohol-polyoxyethylene ether sodium sulfate, the modified asphalt and the SBS glue powder is (0.5-1.5).
4. The composite mortar for the filling layer of the plate-type ballastless track according to claim 1, wherein the dry powder is prepared by uniformly mixing the following raw materials in parts by weight: 70-90 parts of cement, 100-140 parts of fine sand, 30-60 parts of quartz sand, 0.5-2 parts of expanding agent and 0.03-0.05 part of aluminum powder.
5. The composite mortar for the filling layer of the slab ballastless track of claim 4, wherein the expanding agent is a magnesium oxide expanding agent; the cement is one or more of 42.5 common Portland cement, 52.5 common Portland cement, 42.5 fly ash cement and 42.5 quick-hardening sulphoaluminate cement; the fineness modulus of the fine sand is 1.6-2.2, and the average grain diameter is 0.15-0.25mm; the average grain diameter of the quartz sand is 1-2mm.
6. The composite mortar for the filling layer of the slab ballastless track of claim 1, wherein the water reducing agent is a polycarboxylic acid powder water reducing agent; the defoaming agent is one or more of ethylene glycol, polyethylene glycol, propylene glycol and organic phosphate.
7. The composite mortar for the filling layer of the slab ballastless track according to claim 1, wherein the preparation method of the surfactant comprises the following steps:
(a) Adding polyhexafluoropropylene oxide monomethyl alcohol into acetone, then adding 3-isocyanatopropyl trimethoxy silane and stannous isooctanoate, stirring for reaction, filtering after the reaction is finished, and then performing rotary evaporation to remove acetone to obtain a product 1;
(b) And (b) adding the product 1 obtained in the step (a), gamma-aminopropyltriethoxysilane and tertiary carbonic acid glycidyl ester into a three-neck flask, then adding triphenylphosphine, stirring and reacting under the nitrogen condition, and obtaining the surfactant after the reaction is completed.
8. The composite mortar for the filling layer of the slab ballastless track according to claim 7, wherein the molar ratio of the polyhexafluoropropylene oxide monomethanol to the 3-isocyanatopropyltrimethoxysilane in the step (a) is 1-1.5, the stirring temperature is 60-70 ℃, and the stirring time is 2-4h; and (b) the product 1 in the step (b), gamma-aminopropyltriethoxysilane and 10 parts of tert-glycidyl carbonate are added in an amount of 2-4, wherein the stirring reaction temperature is 50-70 ℃, and the reaction time is 1-3h.
9. The preparation method of the composite mortar for the filling layer of the slab ballastless track of any one of claims 1 to 8 is characterized by comprising the following steps:
weighing the raw materials according to the weight ratio, sequentially adding water, modified emulsified asphalt and a defoaming agent into a mortar stirrer, and stirring for the first time; and then adding the dry powder, the water reducing agent, the surfactant and the triethanolamine, stirring for the second time, reducing the rotating speed to 20-30rpm after stirring is finished, and stirring for 1-2min to obtain the composite mortar.
10. The preparation method of the composite mortar for the filling layer of the slab ballastless track according to claim 9, wherein the primary stirring speed is 30-40rpm, and the stirring time is 1-2min; the secondary stirring speed is 70-80rpm, and the stirring time is 4-8min.
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