CN111533517B - Rapid repair mortar for high-speed railway concrete track slab and preparation method thereof - Google Patents
Rapid repair mortar for high-speed railway concrete track slab and preparation method thereof Download PDFInfo
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- CN111533517B CN111533517B CN202010346732.1A CN202010346732A CN111533517B CN 111533517 B CN111533517 B CN 111533517B CN 202010346732 A CN202010346732 A CN 202010346732A CN 111533517 B CN111533517 B CN 111533517B
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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
- C04B28/06—Aluminous 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0045—Polymers chosen for their physico-chemical characteristics
- C04B2103/0053—Water-soluble polymers
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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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
Abstract
The invention provides a quick repair mortar for a high-speed railway concrete track slab, which comprises the following raw materials in percentage by mass: 100 parts of cement, 50-250 parts of fine aggregate, 5-25 parts of mineral admixture, 0-8 parts of soluble latex powder, 0-20 parts of polymer emulsion, 0.1-1.0 part of water reducing agent, 0.2-2.0 parts of expansion component, 0.1-1.5 parts of plastic agent, 0.1-1.2 parts of early strength agent, 0.2-1.5 parts of retarding component, 0.1-0.5 part of defoaming agent and 0-30 parts of water; wherein the mass parts of the soluble latex powder and the polymer emulsion are not 0 at the same time. The invention also provides a preparation method of the rapid modification mortar and application of the rapid modification mortar in repairing non-structural damage of a ballastless high-speed railway concrete track slab. The rapid repair mortar disclosed by the invention has the characteristics of good workability, high early strength and high strength, high volume stability, good durability and the like.
Description
Technical Field
The invention belongs to the field of concrete and railway building materials, and particularly relates to mortar for quickly repairing a concrete track slab of a high-speed railway and a preparation method thereof.
Background
The slab ballastless track is one of main track structure forms of the high-speed railway in China, and takes a prefabricated track slab as a structural core. The prefabricated track plate can be mainly divided into a CRTSI type, a CRTSII type and a CRTSIII type. By 2019, the total operating mileage of the high-speed railway in China exceeds 3 kilometers, and the service number of the concrete track slabs on the railway line is nearly 1000 kilometers. With the increase of operation time, the number of damaged track slabs is increased. When the track slab has non-structural damages such as local fragmentation, block dropping, honeycomb pitted surface and the like which affect the operation safety and durability, the damaged part needs to be repaired in a skylight time period (generally 4 hours) so as to achieve the purposes of stopping damage, improving performance and prolonging service life. The conventional cement mortar material has the defects of slow strength structure formation, poor interface bonding performance, poor volume stability and the like, so that the requirement of timely opening and operating a train after maintenance cannot be met, and the damage of a maintenance part can be caused again in a short time after the opening and operating.
Therefore, mortar specially used for rapidly repairing the ballastless track prefabricated track plate appears in the prior art. For example, a Chinese patent application with publication number CNl02924021A (2013, 2, 13) discloses a composite cement-based quick-setting dry material and mortar for ballastless track maintenance and a preparation method thereof. The dry material comprises, by mass, 25-45% of composite cement, 7.8-15% of composite mineral admixture, 0.05-0.1% of retarder, 0.05-0.11% of defoamer, 0-0.01% of water-retaining agent, 0.26-1% of thickener, 0.1-0.16% of water-reducing agent, 0.05-0.1% of fiber and 46-62.5% of quartz sand, the composite cement comprises, by mass, 10-20% of portland cement and 80-90% of sulphoaluminate cement, the composite mineral admixture comprises, by mass, 20-60% of silica fume and 40-80% of mineral powder, the retarder is boric acid or tartaric acid, the defoamer is polyether modified silicon defoamer or polydimethylsiloxane, the water-retaining agent is hydroxypropyl methyl cellulose ether or methyl cellulose ether, the thickener is redispersible latex powder, the water-reducing agent is polycarboxylate high-efficiency, and the fiber is polyacrylonitrile fiber or polypropylene fiber. Although the mortar disclosed by the invention has the performance of quick setting and early strength, the mortar has high fluidity and poor plasticity and is only suitable for closed space filling type construction. The mortar 28d disclosed by the invention has the maximum compressive strength of only 45MPa (embodiment 2 in the specification), is not matched with the strength of the track plate C60, and cannot meet the use requirement. Organic resin repair materials have also appeared in the prior art. The material has high cost, strict requirements on construction environment and complex process. Meanwhile, the resin material has poor aging resistance and durability. In addition, the inorganic-organic materials have large differences in temperature sensitivity, stress-strain response and the like, so that a stress difference is easily formed at the repaired interface, cracks, even separation and the like are generated between the repaired material and the track slab substrate, and the durability of maintenance is difficult to realize. The invention patent CN101560077A discloses an epoxy resin mortar composition applied to a slab ballastless track, the mortar has the characteristics of heat aging resistance, chemical corrosion resistance, good elasticity and mechanical strength and the like for cement, but the preparation process of raw materials is complex, the stirring time is long, the requirements of high-speed railway ballastless track quick construction and repair cannot be well met, the epoxy resin mortar composition in the patent does not relate to the hour strength, and the 28d strength is low.
Disclosure of Invention
The invention mainly aims to provide a quick repair mortar for a high-speed railway concrete track slab and a preparation method thereof. The rapid repair mortar has the advantages of simple construction, good interface cohesiveness and matching, high volume stability, excellent anti-permeability performance and durability, and the like.
In order to achieve the technical effects, the invention adopts the following technical scheme:
a quick repair mortar for a high-speed railway concrete track plate comprises the following raw materials in parts by mass: 100 parts of cement, 50-250 parts of fine aggregate, 5-25 parts of mineral admixture, 0-8 parts of soluble latex powder, 0-20 parts of polymer emulsion, 0.1-1.0 part of water reducing agent, 0.2-2.0 parts of expansion component, 0.1-1.5 parts of plasticizer, 0.1-1.2 parts of early strength admixture, 0.2-1.5 parts of retarding component, 0.1-0.5 part of defoaming agent and 0-30 parts of water; wherein the mass parts of the soluble latex powder and the polymer emulsion are not 0 at the same time.
Preferably, the rapid repair mortar for the high-speed railway concrete track slab comprises the following raw materials in parts by mass: 100 parts of cement, 100-180 parts of fine aggregate, 10-25 parts of mineral admixture, 0-5 parts of soluble latex powder, 0-15 parts of polymer emulsion, 0.1-0.6 part of water reducing agent, 0.2-1.5 parts of expansion component, 0.1-1.0 part of plasticizer, 0.1-1.0 part of early strength admixture, 0.2-1.0 part of retarding component, 0.1-0.3 part of defoaming agent and 3-25 parts of water; wherein the mass parts of the soluble latex powder and the polymer emulsion are not 0 at the same time.
Preferably, the cement is selected from one or more of sulphoaluminate cement, portland cement or superfine cement in any proportion.
Preferably, the portland cement is selected from one or more of 52.5-grade portland cement and 62.5-grade portland cement in any proportion.
Preferably, the sulphoaluminate cement is one or more of 42.5-grade sulphoaluminate cement and 52.5-grade sulphoaluminate cement in any proportion.
Preferably, the specific surface area of the superfine cement is not less than 500m 2 /kg。
Preferably, the fine aggregate is selected from one or more of quartz sand, river sand and mountain sand with continuous particle grading of 40-120 meshes and water content of not more than 0.5% (w/w), or any proportion.
Preferably, the mineral admixture is selected from one or more of silica fume, ground slag powder, class I fly ash and class II fly ash in any proportion.
The silica fume is any one or more of silica fume meeting the requirements of the standard GB/T27690 silica fume for mortar and concrete, and comprises common silica fume and/or modified silica fume.
Preferably, the soluble latex powder is selected from one or more of vinyl acetate and ethylene copolymerized rubber powder, styrene and butadiene copolymerized rubber powder and acrylate and styrene copolymerized rubber powder in any proportion.
Preferably, the polymer emulsion is selected from one or more of modified acrylic emulsion, butylbenzene emulsion, styrene-acrylic emulsion, carboxylic butylbenzene emulsion and vinyl acetate emulsion in any proportion.
Also preferably, the polymer emulsion has a solids content of 30% to 50% (w/w).
Preferably, the water reducing agent is selected from one or more of an amino carboxylic acid water reducing agent, a polycarboxylic acid water reducing agent and a naphthalene water reducing agent in any proportion.
Preferably, the expansion component is selected from one or more of aluminum powder, plastic expansion agent, UEA expansion component, CSA expansion component, calcium oxide expansion component and magnesium oxide expansion component in any proportion.
Still preferably, the aluminum powder is scaly aluminum powder or granular aluminum powder with fineness greater than 200 meshes.
Preferably, the plastic agent is selected from one or more of bentonite, hydroxypropyl methyl cellulose ether, carbomer resin and modified starch in any proportion.
Preferably, the early strength agent is selected from one or more of calcium formate, triethanolamine, lithium carbonate and lithium hydroxide in any proportion.
Preferably, the retarding component is selected from one or more of sodium gluconate, borax, sodium citrate, boric acid and tartaric acid in any proportion.
Preferably, the defoamer is a silicone defoamer.
Preferably, the rapid repair mortar for a concrete track slab of a high speed railway according to the present invention may further include a toner.
Preferably, the toner is not more than 0.5 parts by mass.
Preferably, the toner is selected from one or more of ink, graphite and carbon black in an arbitrary ratio.
Among the raw materials, cement, fine aggregate, mineral admixture, soluble latex powder, water reducing agent, expansion component, plasticizer, early strength agent, retarding component and toner are solid raw materials; the polymer emulsion, defoamer and water are non-solid materials.
The invention also aims to provide a preparation method of the rapid repair mortar for the high-speed railway concrete track slab, which comprises the following operations:
I. preparing raw materials according to a mixture ratio;
II, uniformly mixing solid raw materials (cement, fine aggregate, mineral admixture, soluble latex powder, water reducing agent, expansion component, plasticizer, early strength agent, retarding component, toner (if any), and the like);
and III, adding non-solid raw materials (the defoaming agent, the polymer emulsion (if the polymer emulsion is available) and stirring and mixing uniformly.
Preferably, said steps II and III are carried out in an apparatus with stirring means.
Further preferably, in the device with the stirring device, the stirring speed of step II is not less than 60r/min, the stirring time is not less than 30s, the stirring speed of step III is not less than 120r/min, and the stirring time is not less than 60s.
The invention also aims to provide the rapid repair mortar and the application of the rapid repair mortar prepared by the method in the repair of the non-structural damage of the concrete track slab of the ballastless high-speed railway.
The high-speed railway ballastless track concrete track slab comprises a CTRSI type, a CTRSI type and a CTRIII type.
Specifically, the non-structural damage repairing method for the ballastless high-speed railway concrete track slab comprises the following steps:
the first step is as follows: cleaning the part to be maintained, and removing impurities such as loose structures, dust and the like on the surface of the part to be maintained;
the second step: pre-treating the part to be maintained, coating an interface agent, and planting ribs to enhance the bonding property and the durability of the maintenance mortar and the concrete matrix if necessary;
the third step: pouring the rapid repair mortar;
the fourth step: and carrying out follow-up treatment on the maintenance part according to actual conditions, such as coating protective paint and the like.
In the present specification, unless otherwise specified, technical terms have their ordinary meanings. For example, "workability" refers to a comprehensive technical index of fresh mortar (or concrete), and generally includes performance indexes such as fluidity, water retention, bleeding, cohesiveness, and the like.
In the specification, the mass parts of the components refer to the relative dosage proportion relation of the components, and do not refer to the specific mass of the components. As the case may be, 1 part by mass may be 500g,1kg,10kg, or any mass.
The invention aims to provide quick repair mortar for non-structural damages such as honeycomb pitted surface, local cracking or block falling, bearing platform damage, prestressed anchor pit sealing mortar damage and the like of a high-speed railway plate type ballastless track concrete track plate. The quick repair mortar is characterized in that according to the characteristic of short maintenance period (generally 4 hours) and construction requirements of a high-speed railway skylight, the mortar has the characteristics of good workability, early strength, high volume stability, good durability and the like by optimizing the grading of fine aggregates and by the compounding technology of components such as an expansion component, a water reducing agent, soluble rubber powder, a polymer emulsion, an early strength agent, a retarding component and the like. The rapid repair mortar provided by the invention has good interface cohesiveness and matching property, and has good consistency with a concrete track slab matrix.
Specifically, the soluble rubber powder and/or the polymer emulsion can enable the mortar slurry to have higher adhesive property, which is beneficial to improving the adhesive force between the repair mortar and the interface, and the mortar solidification and the polymer film forming are carried out synchronously, so that the compactness of the repair mortar is obviously improved, and the impermeability and the freezing resistance of the mortar are improved. The compounding of different expansion components obviously improves the volume stability of each stage in the hardening process of the repair mortar. The subsequent examples show that the rapid repair mortar provided by the invention has the compressive strength of more than 21MPa within 2h, the compressive strength of more than 42MPa within 1d and the compressive strength of 70MPa within 28 days. The flexural strength of the mortar can reach more than 4.3MPa, more than 6.3MPa and more than 11.7MPa respectively when the mortar is in 2h, 1d and 28 d. In addition, the embodiment also shows that the shrinkage rate of the mortar of 28d is less than 0.01%, and the interface stress between the repair mortar and the rail plate substrate is reduced, so that the durability of the repair effect is ensured. The plasticity agent effectively improves the workability of the mortar and simultaneously enhances the plasticity retention of the repair mortar, thereby reducing the construction difficulty and improving the working efficiency.
Detailed Description
The invention is illustrated below with reference to specific examples. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention in any way.
The experimental procedures in the following examples are conventional unless otherwise specified. The raw materials and reagent materials used in the following examples are all commercially available products unless otherwise specified.
Example 1Rapid repair mortar for high-speed railway concrete track slab
The raw materials and the parts by weight of the rapid repair mortar in the embodiment are shown in table 1; wherein the content of the first and second substances,
the cement is 52.5 grade quick hardening sulphoaluminate cement; the mineral admixture is I-grade fly ash; the fine aggregate is machine-made sand with 40-120 meshes of continuous particle gradation; the expansion components are a plastic expanding agent and a UEA expanding agent in a mass ratio of 1: 10; the plastic agent is hydroxypropyl methyl cellulose ether; the water reducing agent is a polycarboxylic acid water reducing agent; the early strength agent is lithium carbonate; the retarding component comprises tartaric acid and boric acid with the mass ratio of 1: 1; the soluble rubber powder is acrylate and styrene copolymerized rubber powder (mass ratio is 1: 1); the defoaming agent is an organic silicon defoaming agent; the toner is carbon black; the polymer emulsion is a modified acrylic emulsion with the solid content of 48 percent.
The rapid repair mortar is prepared by the following method:
all solid raw materials (cement, fine aggregate, mineral admixture, soluble latex powder, water reducing agent, expansion component, plastic agent, early strength agent, retarding component and toner) are added into a stirrer after being weighed in proportion, stirred for 45s at the speed of 60r/min and mixed uniformly; and adding the defoaming agent, the polymer emulsion and the water according to the proportion, and stirring for 90s at the speed of 150r/min to obtain the polymer emulsion.
Example 2Rapid repair mortar for high-speed railway concrete track slab
The raw materials of the rapid repair mortar in the embodiment and the parts by weight thereof are shown in table 1, wherein:
the cement is 52.5 grade rapid hardening sulphoaluminate cement and superfine portland cement with the mass ratio of 4: 1; the mineral admixture is silica fume and I-grade fly ash with the mass ratio of 2: 3; the fine aggregate is river sand with 40 meshes to 120 meshes and the water content of 0.1 percent; the expansion component is 200-mesh scale aluminum powder, a plastic expanding agent and a UEA expansion component with the mass ratio of 1: 2: 12; the plastic agent is hydroxypropyl methyl cellulose ether; the water reducing agent is a polycarboxylic acid water reducing agent; the early strength agent is lithium carbonate and calcium formate with the mass ratio of 1: 10; the retarding component comprises tartaric acid and citric acid with the mass ratio of 1: 1; the soluble rubber powder is acrylate and styrene copolymerized rubber powder (the mass ratio is 1: 2); the defoaming agent is an organic silicon defoaming agent; the toner is carbon black; the polymer emulsion is a modified acrylic emulsion with the solid content of 48 percent.
The quick repair mortar is prepared by the following method:
adding solid raw materials (cement, fine aggregate, mineral admixture, soluble latex powder, water reducing agent, expansion component, plastic agent, early strength agent, retarding component and toner) into a stirrer after proportional metering, stirring for 45s at the speed of 60r/min, and uniformly mixing; and adding the defoaming agent, the polymer emulsion and the water according to the proportion, and stirring for 90s at the speed of 150r/min to obtain the emulsion.
Example 3Rapid repair mortar for high-speed railway concrete track slab
The raw materials of the rapid repair mortar in the embodiment and the parts by weight thereof are shown in table 1, wherein:
the cement is 42.5 grade quick hardening sulphoaluminate cement; the mineral admixture is silica fume; the fine aggregate is river sand of 40 meshes to 120 meshes with the water content of 0.1 percent; the expansion component comprises a plastic expanding agent and a UEA expansion component with the mass ratio of 1: 12; the plasticizer is modified starch and hydroxypropyl methyl cellulose ether with the mass ratio of 1: 1; the water reducing agent is a polycarboxylic acid water reducing agent; the early strength agent is lithium hydroxide; the retarding component is borax and citric acid with the ratio of 2: 1; the defoaming agent is an organic silicon defoaming agent; the toner is carbon black; the polymer emulsion is a modified acrylic emulsion with the solid content of 48 percent.
The rapid repair mortar is prepared by the following method:
adding solid raw materials (cement, fine aggregate, mineral admixture, water reducing agent, expansion component, plastic agent, early strength agent, retarding component and toner) into a stirrer after the solid raw materials are weighed in proportion, stirring for 45s at the speed of 60r/min, and uniformly mixing; and adding the defoaming agent, the polymer emulsion and the water according to the proportion, and stirring for 90s at the speed of 150r/min to obtain the polymer emulsion.
Example 4Rapid repair mortar for high-speed railway concrete track slab
The raw materials of the rapid repair mortar in the embodiment and the parts by weight thereof are shown in table 1, wherein:
the cement is 52.5 grade rapid hardening sulphoaluminate cement and superfine portland cement with the mass ratio of 1: 1; the mineral admixture is I-grade fly ash and silica fume with the mass ratio of 2: 1; the fine aggregate is machine-made silica sand and dried river sand with the water content not more than 0.1 percent and the mass ratio of 1: 1; the expansion component comprises 200 meshes of granular aluminum powder, a plastic expanding agent and a UEA expansion component with the mass ratio of 1: 10; the plastic agent is bentonite and hydroxypropyl methyl cellulose ether with the mass ratio of 3: 1; the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the early strength agent is calcium formate and lithium hydroxide with the mass ratio of 5: 1; the retarding component comprises sodium gluconate and tartaric acid with the mass ratio of 4: 1; the defoaming agent is an organic silicon defoaming agent; the toner is carbon black; the polymer emulsion is a modified acrylic emulsion with solid content of 48 percent and a styrene-acrylic emulsion with solid content of 50 percent in a mass ratio of 1: 1.
The quick repair mortar is prepared by the following method:
adding solid raw materials (cement, fine aggregate, mineral admixture, water reducing agent, expansion component, plasticizer, early strength agent, retarding component and toner) into a stirrer after proportional metering, stirring at the speed of 60r/min for 45s, and uniformly mixing; and adding the defoaming agent, the polymer emulsion and the water according to the proportion, and stirring for 90s at the speed of 150r/min to obtain the polymer emulsion.
Example 5Rapid repair mortar for high-speed railway concrete track slab
The raw materials of the rapid repair mortar in the embodiment and the parts by weight thereof are shown in table 1, wherein:
the cement is 52.5 grade quick hardening sulphoaluminate cement; the mineral admixture is I-grade fly ash and silica fume with the mass ratio of 1: 1; the fine aggregate is machine-made silica sand and dried river sand with the water content of not more than 0.1 percent and the mass ratio of 1: 2; the expansion component is a plastic expansion agent and a CSA expansion component with the mass ratio of 1: 10; the plastic agent is bentonite and hydroxypropyl methyl cellulose ether with the mass ratio of 10: 1; the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the early strength agent is lithium carbonate; the retarding component comprises sodium gluconate and boric acid with the mass ratio of 3: 1; the defoaming agent is an organic silicon defoaming agent; the toner is carbon black; the polymer emulsion is butylbenzene emulsion with solid content of 50%.
The rapid repair mortar is prepared by the following method:
adding solid raw materials (cement, fine aggregate, mineral admixture, water reducing agent, expansion component, plasticizer, early strength agent, retarding component and toner) into a stirrer after proportional metering, stirring at the speed of 60r/min for 45s, and uniformly mixing; and adding the defoaming agent, the polymer emulsion and the water according to the proportion, and stirring for 90s at the speed of 150r/min to obtain the emulsion.
Example 6Rapid repair mortar for high-speed railway concrete track slab
The composition of the rapid repair mortar of the present example is exactly the same as that of example 5, and is prepared by the following method:
after solid raw materials (cement, fine aggregate, mineral admixture, water reducing agent, expansion component, plasticizer, early strength agent, retarding component and toner) are measured in proportion, the solid raw materials are put into a high-speed mixer, and are mixed and stirred at high speed for 12min to prepare dry powder, and the dry powder is packaged for later use; and (3) adding the dry powder, the defoaming agent, the polymer emulsion, the water and the like into a stirrer according to the mixing ratio at the first-aid repair construction site, and stirring for 120s at the speed of 150r/min to obtain the composite material.
Comparative example 1Mortar
The mortar raw materials and the parts by weight thereof in the comparative example are shown in table 1, wherein:
the cement is 52.5 grade rapid hardening sulphoaluminate cement and superfine portland cement with the mass ratio of 1: 1; the mineral admixture is I-grade fly ash and silica fume with the mass ratio of 2: 1; the fine aggregate is machine-made silica sand and dried river sand with the water content not more than 0.1 percent and the mass ratio of 1: 1; the expansion component comprises 200 meshes of granular aluminum powder, a plastic expanding agent and a UEA expansion component in a mass ratio of 1: 10; the plastic agent is bentonite and hydroxypropyl methyl cellulose ether with the mass ratio of 3: 1; the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the early strength agent is calcium formate and lithium hydroxide with the mass ratio of 5: 1; the retarding component comprises sodium gluconate and tartaric acid with the mass ratio of 4: 1; the defoaming agent is an organic silicon defoaming agent; the toner is carbon black.
The rapid repair mortar is prepared by the following method:
after all the raw materials are weighed in proportion, adding the raw materials into a stirrer, stirring the raw materials for 45s at the speed of 60r/min, and uniformly mixing the raw materials; and adding water according to the proportion, and stirring for 90s at the speed of 150r/min to obtain the product.
Comparative example 2Mortar
The mortar raw materials and the parts by mass thereof in the comparative example are shown in table 1, wherein:
the cement is 42.5 grade rapid hardening sulphoaluminate cement; the mineral admixture is silica fume; the fine aggregate is 8-40 mesh river sand with the water content of 0.1 percent; the expansion component comprises a plastic expanding agent and a UEA expansion component with the mass ratio of 1: 12; the plastic agent is modified starch and hydroxypropyl methyl cellulose ether with the mass ratio of 1: 1; the water reducing agent is a polycarboxylic acid water reducing agent; the early strength agent is lithium hydroxide; the retarding component is borax and citric acid with the ratio of 2: 1; the defoaming agent is an organic silicon defoaming agent; the toner is carbon black; the polymer emulsion is a modified acrylic emulsion with the solid content of 48 percent.
The rapid repair mortar is prepared by the following method:
adding solid raw materials (cement, fine aggregate, mineral admixture, water reducing agent, expansion component, plasticizer, early strength agent, retarding component and toner) into a stirrer after proportional metering, stirring at the speed of 60r/min for 45s, and uniformly mixing; and adding the defoaming agent, the polymer emulsion and the water according to the proportion, and stirring for 90s at the speed of 150r/min to obtain the emulsion.
Test example 1Performance measurement of the rapid repair mortar for high speed railway concrete track slabs prepared in examples 1 to 6 and the mortar prepared in comparative examples 1 to 2
The rapid repair mortar prepared in examples 1 to 6 and the mortar prepared in comparative examples 1 to 2 were subjected to performance tests, respectively, according to the standards of "cement mortar strength test method" (GB/T17671-1999), "Polymer modified Cement mortar test procedure" (DL/T5126-2001), "Standard of method for testing Long-term Performance and durability of ordinary concrete" (GB/T50082-2009). The test results are shown in table 2.
The test results in Table 2 show that the 2h compressive strength of the rapid repair mortar is more than 21MPa, and the 2h flexural strength is more than or equal to 4.3MPa, which indicates that the rapid repair mortar has early strength and early hardness and can meet the requirement of short maintenance window period of a high-speed railway. The compressive strength of the rapid repair mortar 28d is more than 67MPa, the flexural strength of 28d is more than or equal to 11.7MPa, and the rapid repair mortar is matched with the strength of a track slab. In addition, the anti-permeability performance of the rapid repair mortar is greater than that of P20, the 28d shrinkage rate is not higher than 0.008%, and the frost resistance level reaches P300, and the data show that the rapid repair mortar has the characteristics of high volume stability, and excellent anti-permeability performance and durability.
Compared with example 4, the raw materials and the parts by mass of the raw materials in comparative example 1 are the same as those in example 4 except that the polymer emulsion is omitted and the amount of water is increased. In comparative example 1, the lack of the polymer emulsion causes the increase of the external water for mixing the mortar, the compressive strength of the prepared mortar is slightly increased, but the flexural strength of the mortar is slightly reduced, and the 28d shrinkage rate is more than 0.01 percent. Therefore, the elastic toughness of the mortar is deteriorated due to the loss of the polymer emulsion, and the anti-fatigue performance such as shearing resistance, deformation resistance and the like of the mortar is further deteriorated. In addition, the anti-chlorine ion permeability of the mortar is slightly reduced. All of the above adversely affect the durability of the mortar.
Compared with the example 3, the raw material composition and the parts by weight of the comparative example 2 are the same as those of the example 3 except that the fine aggregate is 8-40 mesh sand. The results show that the change of the fine aggregate gradation leads to the reduction of the compressive strength/flexural strength of the prepared mortar, the deterioration of the chloride ion permeation resistance and the increase of the shrinkage rate of the mortar, thereby showing that the mortar performance is deteriorated when the mortar is not prepared according to the specific proportion of the invention.
Claims (10)
1. The quick repair mortar for the high-speed railway concrete track slab comprises the following raw materials in parts by mass: 100 parts of cement, 100-180 parts of fine aggregate, 10-25 parts of mineral admixture, 0-5 parts of soluble latex powder, 0-15 parts of polymer emulsion, 0.1-0.6 part of water reducing agent, 0.2-1.5 parts of expansion component, 0.1-1.0 part of plasticizer, 0.1-1.0 part of early strength admixture, 0.2-1.0 part of retarding component, 0.1-0.3 part of defoaming agent and 3-25 parts of water; wherein the mass parts of the soluble latex powder and the polymer emulsion are not 0 at the same time;
the fine aggregate is selected from quartz sand or river sand with continuous particle grading of 40-120 meshes and water content not more than 0.5% (w/w);
the mineral admixture is selected from one or two of silica fume and I-grade fly ash;
the soluble latex powder is acrylate and styrene copolymerized rubber powder;
the polymer emulsion is selected from one or more of modified acrylic emulsion, butylbenzene emulsion and styrene-acrylic emulsion with the solid content of 30-50% by mass;
the water reducing agent is a polycarboxylic acid water reducing agent;
the expansion component is selected from one or more of aluminum powder, a plastic expanding agent, a UEA expansion component and a CSA expansion component;
the plastic agent is selected from one or more of bentonite, hydroxypropyl methyl cellulose ether and modified starch;
the early strength agent is selected from one or more of lithium carbonate, calcium formate and lithium hydroxide;
the retarding component is selected from one or more of sodium gluconate, borax, sodium citrate, boric acid and tartaric acid;
the defoaming agent is an organic silicon defoaming agent.
2. The rapid repair mortar according to claim 1, wherein the cement is selected from one or more of sulphoaluminate cement, portland cement or ultra-fine cement in any proportion;
the Portland cement is selected from one or more of Portland cement 52.5 and Portland cement 62.5 in any proportion;
the sulphoaluminate cement is one or more of 42.5-grade sulphoaluminate cement and 52.5-grade sulphoaluminate cement in any proportion;
the specific surface area of the superfine cement is not less than 500m 2 /kg。
3. The rapid repair mortar according to claim 1, wherein the aluminum powder is a scaly aluminum powder or granular aluminum powder having a fineness of more than 200 mesh.
4. The rapid repair mortar according to any one of claims 1 to 3, wherein the rapid repair mortar may further comprise a toner.
5. The rapid repair mortar according to claim 4, wherein the toner is present in an amount of not more than 0.5 parts by mass.
6. The rapid repair mortar according to claim 4, wherein the toner is selected from one or more of ink, graphite and carbon black in any ratio.
7. The rapid repair mortar according to claim 5, wherein the toner is selected from one or more of ink, graphite and carbon black in any ratio.
8. Process for the preparation of a rapid repair mortar according to any one of claims 1 to 7, comprising the following operations:
I. preparing raw materials according to a mixture ratio;
II, uniformly mixing the solid raw materials;
and III, adding the non-solid raw materials, and stirring and mixing uniformly.
9. The method of claim 8, wherein steps II and III are performed in an apparatus with a stirring device.
10. The method according to claim 9, wherein the step II stirring speed is not less than 60r/min and the stirring time is not less than 30s, and the step III stirring speed is not less than 120r/min and the stirring time is not less than 60s.
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| CN115073069A (en) * | 2021-03-15 | 2022-09-20 | 江西路邦新型材料有限公司 | Pervious concrete mortar |
| CN113121191B (en) * | 2021-04-30 | 2022-06-07 | 北京东方富昊新型建材有限公司 | Rapid repairing adhesive and preparation method and application method thereof |
| CN113548858A (en) * | 2021-08-18 | 2021-10-26 | 上海市建筑科学研究院有限公司 | Repair material with simple construction and good flexibility and preparation method thereof |
| CN113929404B (en) * | 2021-11-29 | 2022-09-13 | 广东碧通百年科技有限公司 | Building repair reinforcing mortar |
| CN114031329A (en) * | 2022-01-11 | 2022-02-11 | 中铁九局集团第三建设有限公司 | Concrete repair material, concrete repair coating and preparation method thereof |
| JP7167375B1 (en) * | 2022-03-18 | 2022-11-08 | 秩父コンクリート工業株式会社 | Repair mortar and concrete repair method |
| CN114853430A (en) * | 2022-05-23 | 2022-08-05 | 成都嘉新科技集团有限公司 | High-performance polymer mortar and preparation method thereof |
| CN115259786A (en) * | 2022-07-01 | 2022-11-01 | 新特新材料集团(河南)股份有限公司 | Repairing material for concrete defects of ballastless track bed |
| CN115159937A (en) * | 2022-07-05 | 2022-10-11 | 中德新亚建筑材料有限公司 | Preparation method of pavement repair mortar layer structure |
| CN115260813A (en) * | 2022-07-18 | 2022-11-01 | 安徽嘉业建设集团有限公司 | Cement-based spraying slurry for repairing inspection well |
| CN115716359A (en) * | 2022-10-18 | 2023-02-28 | 中铁第四勘察设计院集团有限公司 | Bonding type concrete canvas for track plate and preparation method thereof |
| KR102624315B1 (en) * | 2023-02-20 | 2024-01-16 | 씨아이에이 주식회사 | Dry mortar for emergency repairs |
| CN116789433A (en) * | 2023-05-30 | 2023-09-22 | 东南大学 | Vinyl acetate-ethylene copolymer emulsion modified geopolymer repair material and preparation method thereof |
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