CN111320450A - Self-compacting material for repairing railway concrete sleeper and preparation method and application thereof - Google Patents
Self-compacting material for repairing railway concrete sleeper and preparation method and application thereof Download PDFInfo
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- CN111320450A CN111320450A CN202010255528.9A CN202010255528A CN111320450A CN 111320450 A CN111320450 A CN 111320450A CN 202010255528 A CN202010255528 A CN 202010255528A CN 111320450 A CN111320450 A CN 111320450A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B31/00—Working rails, sleepers, baseplates, or the like, in or on the line; Machines, tools, or auxiliary devices specially designed therefor
- E01B31/20—Working or treating non-metal sleepers in or on the line, e.g. marking, creosoting
- E01B31/24—Forming, treating, reconditioning, or cleaning holes in sleepers; Drilling-templates
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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
- 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
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- 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
- C04B28/14—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 calcium sulfate cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
- E01B3/28—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a self-compacting material for repairing a railway concrete sleeper, and a preparation method and application thereof, wherein the self-compacting material for repairing the railway concrete sleeper comprises the following components in parts by weight: 70-100 parts of cement; 6-15 parts of gypsum; 8-15 parts of mineral admixture; 0.1-1 part of coagulation regulating component; 0.1-0.3 part of water reducing agent; 1-8 parts of latex powder; 0.3-1 part of surfactant; 0.03-0.1 part of thickening and water-retaining agent; 100 portions and 300 portions of sand. The self-compacting material for repairing the railway concrete sleeper prepared by the invention has the characteristics of self-compacting and self-maintenance. The coupling effect of the thickening and water-retaining agent and the surfactant can reduce the surface tension of the capillary solution and refine the pore structure, and simultaneously can reduce the water evaporation in the hydration process of the material, increase the dimensional stability of the material and realize the self-compaction and self-maintenance of the material.
Description
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a self-compacting material for repairing a railway concrete sleeper, and a preparation method and application thereof.
Background
Railways occupy a very important position in the transportation industry of China. The sleepers are important components constituting a railway track structure, which not only must endure various forces from the rails, but also must effectively maintain the direction and position of the track. Therefore, whether the stability of the sleeper is directly related to the normal operation of the railway. In recent years, with the requirements of railway passenger transportation on smoothness and comfort are higher and higher, and the requirements on axle load and load capacity are higher and higher, the quality and durability of sleepers are more important.
When the sleeper is subjected to complex environmental factors and multiple actions of train loads, the phenomena of cracking, block falling and the like easily occur at the positions of a shoulder, an end head and the like of the sleeper. If the diseases are not effectively treated in time, the driving safety of the railway is seriously influenced. Repairing the sleeper is an effective and economical treatment. The repair of the sleeper is firstly completed on the premise of not influencing the normal operation of a track line, so that the repair material has the characteristics of quick curing, quick strength rise in hours and the like aiming at the problem of short maintenance windowing time; in addition, self-compaction and maintenance-free are effective means for ensuring the completion of the skylight in the period. Therefore, concrete sleeper repair materials are required to have the characteristics of early strength, quick hardening, self-compaction, high bonding force, excellent durability, no need of maintenance, and the like.
The prior art discloses a rapid concrete repairing material for a high-speed railway, which comprises high-heat rapid-setting cement, water-based epoxy resin emulsion, a curing agent, rubber powder, an early-strength setting agent and the like; in addition, the prior art discloses a super early strength polymer rapid repair mortar material, which comprises rapid hardening cement, quartz sand, a polymer tackifier, a thickening agent, an early strength agent, a thickening agent, a water reducing agent, a defoaming agent and chemical short fibers; these materials cannot simultaneously meet the requirements of high hardness, high strength, self-compaction, high bonding force, no need of maintenance and good durability.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a self-compacting material for repairing railway concrete sleeper, and a preparation method and application thereof. The material has the advantages of self-compaction, quick hardening, early strength, high adhesive force, strong dimensional stability, good durability and simple and convenient construction.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
The self-compacting material for repairing the railway concrete sleeper, provided by the invention, comprises the following components in parts by weight:
70-100 parts of cement; 6-15 parts of gypsum; 8-15 parts of mineral admixture; 0.1-1 part of coagulation regulating component; 0.1-0.3 part of water reducing agent; 1-8 parts of latex powder; 0.3-1 part of surfactant; 0.03-0.1 part of thickening and water-retaining agent; 100 portions and 300 portions of sand.
Preferably, the self-compacting material for repairing railway concrete sleepers is one selected from the group consisting of portland cement, aluminate cement and sulphoaluminate cement.
Preferably, the self-compacting material for repairing railway concrete sleepers is described as above, wherein the gypsum is dihydrate gypsum or anhydrite.
Preferably, the self-compacting material for repairing railway concrete sleepers is a self-compacting material for repairing railway concrete sleepers, wherein the mineral admixture is at least one selected from silica fume, metakaolin, fly ash, mineral powder and kaolin.
Preferably, the self-compacting material for repairing railway concrete sleepers is a self-compacting material for repairing railway concrete sleepers, wherein the set-adjusting component is at least one selected from lithium salts, calcium formate, calcium nitrite, tartaric acid, citric acid, boric acid and oxalic acid.
Preferably, the self-compacting material for repairing railway concrete sleepers is a polycarboxylate water reducer.
Preferably, the self-compacting material for repairing railway concrete sleepers is prepared from a polycarboxylate superplasticizer, wherein the water reduction rate of the polycarboxylate superplasticizer is not less than 25%.
Preferably, the self-compacting material for repairing a railway concrete sleeper comprises at least one latex powder selected from polyvinyl acetates and acrylics.
Preferably, when the latex powder is selected from polyvinyl acetate esters and acrylic acid, the weight ratio of the polyvinyl acetate esters to the acrylic acid is 2: 1-4: 1.
preferably, the self-compacting material for repairing railway concrete sleepers is a self-compacting material, wherein the surfactant is selected from inorganic salt phosphates.
Preferably, the self-compacting material for repairing railway concrete sleepers is a self-compacting material for repairing railway concrete sleepers, wherein the surfactant is at least one selected from potassium pyrophosphate, sodium pyrophosphate, potassium polyphosphate, sodium polyphosphate and sodium metaphosphate.
Preferably, the self-compacting material for repairing railway concrete sleepers is one or two of cellulose ether, starch ether and bentonite-based thickening and water-retaining agents.
Preferably, the self-compacting material for repairing railway concrete sleepers, wherein when the thickening and water retaining agent comprises cellulose ether and starch ether, the weight ratio of the cellulose ether to the starch ether is 1.5-2.5.
Preferably, the self-compacting material for repairing railway concrete sleepers is sand which is silica sand containing no soil and has a fineness modulus of 2.3-2.5.
Preferably, the self-compacting material for repairing a railway concrete sleeper has a 2h bonding strength of 1.0MPa or more, a 2h compressive strength of 50MPa or more, a bending strength of 5MPa or more, a 28-day compressive strength of 65MPa or more, a bending strength of 10MPa or more, and a 28-day bonding strength of 2.5MPa or more.
The purpose of the invention and the technical problem to be solved are further realized by adopting the following technical scheme.
The preparation method of the self-compacting material for repairing the railway concrete sleeper, provided by the invention, comprises the following steps of:
weighing the components in parts by weight, and uniformly mixing to obtain the self-compacting material for repairing the railway concrete sleeper.
The purpose of the invention and the technical problem to be solved are further realized by adopting the following technical scheme.
The use method of the self-compacting material for repairing the railway concrete sleeper, provided by the invention, comprises the following steps of:
and (3) fully mixing water and the self-compacting material for repairing the railway concrete sleeper for 2-3 min according to the weight ratio of 0.15-0.25, and uniformly mixing.
Preferably, the application method of the self-compacting material for repairing the railway concrete sleeper is that the mixing rotation speed is 100-200 r/min.
The purpose of the invention and the technical problem to be solved are further realized by adopting the following technical scheme.
The construction method of the self-compacting material for repairing the railway concrete sleeper, provided by the invention, comprises the following steps of:
1) chiseling loose concrete and aggregate particles at the damaged part of the structure to form a pitted surface new stubble, and then removing impurities on the pitted surface new stubble to obtain a clean interface;
2) wiping the interface obtained in the step 1) with a wet rag, and then brushing an interface agent with a brush;
3) erecting the template, and sealing the gap of the template by using an adhesive tape;
4) standing the self-compacting material for repairing the railway concrete sleeper for 2-3 minutes, and stirring for 1-2 min to obtain a repairing material;
5) pouring the mixed repairing material in the step 4) into the template in the step 3);
6) and (4) after the material is hardened, removing the template, and repairing and grinding the mortar to be flat.
Preferably, the construction method of the self-compacting material for repairing railway concrete sleepers further comprises a step of completely removing the sleeper fasteners and fittings before step 1) when the damaged part of the structure is a shoulder part, so that the sleepers are not stressed any more.
Preferably, the construction method of the self-compacting material for repairing a railway concrete sleeper further comprises a step of performing rust removal and prevention treatment on the steel bars after the step 1) and before the step 2) when the steel bars are exposed at the damaged part of the structure.
Preferably, in the construction method of the self-compacting material for repairing a railway concrete sleeper, the step of removing the impurities on the new pitted surface in the step 1) specifically includes removing dust or debris on the new pitted surface by using a wire brush, a vacuum cleaner or compressed air.
Preferably, in the construction method of the self-compacting material for repairing a railway concrete sleeper, the interface agent in step 2) is polymer cement paste.
Preferably, in the construction method of the self-compacting material for repairing the railway concrete sleeper, in the step 4), the stirring speed is 100-.
By the technical scheme, the self-compacting material for repairing the railway concrete sleeper has the following advantages:
1. the self-compacting material for repairing the railway concrete sleeper, prepared by the invention, has high fluidity, high clearance permeability and high segregation resistance. The invention firstly adopts the fine aggregate with reasonable gradation and the water reducing agent to increase the dispersibility and the fluidity of the material, and secondly adds the thickening water-retaining agent to keep the uniformity and the stability of the newly mixed material and prevent the demixing bleeding. The initial value of the truncated cone fluidity of the self-compacting material for repairing the railway concrete sleeper is more than or equal to 340mm, the initial value of the truncated cone fluidity is more than or equal to 310mm in 30min, the self-compacting material can be directly poured and molded without vibration, the filling degree is high, the surface is smooth, and no honeycomb pitted surface exists.
2. The self-compacting material for repairing the railway concrete sleeper prepared by the invention has self-maintenance performance. The thickening and water-retaining agent and the surfactant are used together, so that the effects of internal maintenance, reduction of surface tension of capillary solution and refinement of pore structure are achieved for the material, and water evaporation in the hydration process of the material can be reduced, so that the self-maintenance of the material is realized, and the later-stage coating maintenance agent or film covering maintenance is not needed.
3. The self-compacting material for repairing the railway concrete sleeper prepared by the invention has good dimensional stability. The hydraulic component is hydrated to form a hydration product with micro-expansion performance, so that the shrinkage of the material can be reduced, and the incorporated surfactant not only further reduces the shrinkage of the material, but also increases the dimensional stability of the material. The test shows that the drying shrinkage of the material of the invention is less than 0.01 percent in 28 days.
4. The self-compacting material for repairing the railway concrete sleeper, prepared by the invention, is simple and convenient to use and low in cost.
5. The self-compacting material for repairing the railway concrete sleeper, prepared by the invention, has excellent mechanical properties. The material is formed by crosslinking an inorganic structure hardened by cement hydration and an organic network structure formed by polymer rubber powder, and has good compressive and flexural strength and excellent bonding performance. The 2h bonding strength is more than 1.0MPa, the 2h compressive strength is more than 50MPa, the flexural strength is more than 5MPa, the 28-day compressive strength is more than 65MPa, and the flexural strength is more than 10 MPa. The bonding strength reaches more than 2.5MPa in 28 days.
6. The self-compacting material for repairing the railway concrete sleeper, which is prepared by the invention, has adjustable construction time. The construction time can be controlled within 5min-1h by adjusting the components of the formula.
7. The self-compacting material for repairing the railway concrete sleeper prepared by the invention has good temperature adaptability. The material composition can be controlled and constructed within the range of 0-40 ℃ of the environmental temperature.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to a self-compacting material for repairing a railway concrete sleeper, a preparation method thereof, and specific embodiments, features and properties thereof according to the present invention. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The following materials or reagents, unless otherwise specified, are all commercially available.
The invention provides a self-compacting material for repairing a railway concrete sleeper, which comprises the following components in parts by weight:
70-100 parts of cement; 6-15 parts of gypsum; 8-15 parts of mineral admixture; 0.1-1 part of coagulation regulating component; 0.1-0.3 part of water reducing agent; 1-8 parts of latex powder; 0.3-1 part of surfactant; 0.03-0.1 part of thickening and water-retaining agent; 100 portions and 300 portions of sand.
In specific implementation, the cement can be selected from any one or two of portland cement, aluminate cement and sulphoaluminate cement, preferably the portland cement is compounded with aluminate, or the portland cement is compounded with sulphoaluminate cement, so that the early strength of the cement is improved after the portland cement is preferably compounded with the sulphoaluminate cement.
In specific implementation, the gypsum can be dihydrate gypsum or anhydrite, preferably anhydrite, and can preferably compensate the material system shrinkage, so that the volume stability of the material is further improved.
In specific implementation, the mineral admixture is selected from at least one of silica fume, metakaolin, fly ash, mineral powder and kaolin, and is preferably silica fume or mineral powder, so that the strength and durability of the material are improved after the mineral admixture is preferably selected.
In specific implementation, the set-regulating component may be at least one selected from lithium salt (such as lithium carbonate), calcium formate, calcium nitrite, tartaric acid, citric acid, boric acid and oxalic acid, and preferably lithium salt (such as lithium carbonate), tartaric acid or citric acid, so as to adjust the initial setting time and final setting time of the material, so that the material can maintain sufficient working time, can be quickly hardened, and has high early strength.
In specific implementation, the water reducing agent can be a polycarboxylic acid water reducing agent; preferably, the water reducing rate of the polycarboxylate water reducer is more than or equal to 25%, and the material can have good fluidity and strength by adopting the water reducer with the water reducing rate of more than or equal to 25%.
In specific implementation, the latex powder can be at least one selected from polyvinyl acetate and acrylic acid; when the latex powder is selected from polyvinyl acetate and acrylic acid, the weight ratio of the polyvinyl acetate to the acrylic acid is 2: 1-4: 1, the emulsion powder with the proportion can make the material have better leveling property and higher interface bonding strength.
In particular embodiments, the surfactant may be selected from inorganic salts phosphates; preferably, the surfactant may be selected from at least one of potassium pyrophosphate, sodium pyrophosphate, potassium polyphosphate, sodium polyphosphates (e.g., sodium tripolyphosphate, sodium pentapolyphosphate), and sodium metaphosphate, which preferably improves material dispersibility.
In specific implementation, the thickening and water-retaining agent can be any one or two of cellulose ether, starch ether or bentonite-based thickening and water-retaining agent, and preferably, the cellulose ether and the starch ether are used in a composite way, so that the post-water retention and self-maintenance effects are better. When the cellulose ether and the starch ether are used in combination, the weight ratio of the cellulose ether to the starch ether is 1.5 to 2.5.
In specific implementation, the sand is quartz sand without soil, and the fineness modulus of the sand is 2.3-2.5. Thus, more excellent aggregate gradation can be ensured, and the working performance is more excellent.
In specific implementation, the self-compacting material for repairing the railway concrete sleeper has the 2h bonding strength of more than 1.0MPa, the 2h compressive strength of more than 50MPa, the flexural strength of more than 5MPa, the 28-day compressive strength of more than 65MPa, the flexural strength of more than 10MPa and the 28-day bonding strength of more than 2.5 MPa.
The preparation method of the dry powder for repairing the railway concrete sleeper comprises the following steps:
weighing the components in parts by weight, and uniformly mixing to obtain the self-compacting material for repairing the railway concrete sleeper.
The use method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
fully mixing water and the self-compacting material for repairing the railway concrete sleeper with the self-compacting material according to the weight ratio of 0.15-0.25 for 2-3 min, and uniformly mixing; the mixing rotating speed is 100-200 r/min.
The construction method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
1) chiseling loose concrete and aggregate particles at the damaged part of the structure to form a pitted surface new stubble, and then removing impurities on the pitted surface new stubble to obtain a clean interface;
2) wiping the interface obtained in the step 1) with wet rags (so that the interface absorbs water sufficiently and keeps wet), and then brushing an interface agent with a brush;
3) erecting the template, and sealing the gap of the template by using an adhesive tape;
4) standing the self-compacting material for repairing the railway concrete sleeper for 2-3 minutes, and stirring for 1-2 min to obtain a repairing material;
5) pouring the mixed repairing material (without vibration) in the step 4) into the template in the step 3);
6) and (4) after the material is hardened, removing the template, and repairing and grinding the mortar to be flat.
In specific implementation, if the damaged part of the structure is a shoulder stopping part, before the step 1), the method further comprises the step of completely removing the sleeper fastener and the fittings so as to enable the sleeper not to bear the pressure any more.
In specific implementation, if the steel bars are exposed at the damaged part of the structure, the method further comprises the step of carrying out rust removal and prevention treatment on the steel bars after the step 1) and before the step 2).
In specific implementation, the step of removing the impurities on the new stubble of the dough twist in the step 1) specifically comprises the steps of removing the impurities such as dust or scraps on the new stubble of the dough twist by using a steel wire brush, a vacuum dust collector or compressed air; the interface agent in the step 2) is polymer cement paste; in the step 4), the stirring speed is 100-200 r/min.
The present invention is further illustrated by the following specific examples, which are not to be construed as limiting the invention thereto.
Example 1
The embodiment provides a self-compacting material for repairing a railway concrete sleeper, which comprises the following components in parts by weight:
75 parts of Portland cement; 25 parts of sulphoaluminate cement; 10 parts of gypsum; 10 parts of silica fume; 0.05 part of lithium carbonate; 0.1 part of tartaric acid; 0.1 part of water reducing agent (in the embodiment, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25%); 2 parts of latex powder (in this example, it is specifically acrylic); 0.07 part of cellulose ether; 0.5 part of sodium tripolyphosphate; 200 parts of sand.
The preparation method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
weighing the components in parts by weight, and uniformly mixing to obtain the self-compacting material for repairing the railway concrete sleeper.
The use method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
the prepared self-compacting material for repairing the railway concrete sleeper is fully mixed with 15 parts of water for 2min at the rotating speed of 200r/min and then is mixed uniformly.
Tests prove that the self-compacting material for repairing the railway concrete sleeper has the initial setting time of 45min, the final setting time of 1h, the 2h bonding strength of 1.2MPa, the 2h compressive strength of 54MPa, the flexural strength of 9MPa, the 28-day compressive strength of 68MPa, the flexural strength of 14MPa, the 28-day bonding strength of 3.2MPa and the 28-day dry shrinkage rate of 0.1%.
Example 2
The embodiment provides a self-compacting material for repairing a railway concrete sleeper, which comprises the following components in parts by weight:
75 parts of Portland cement; 15 parts of aluminate cement; 10 parts of gypsum; 10 parts of metakaolin; 0.08 part of lithium carbonate; 0.1 part of tartaric acid; 0.1 part of water reducing agent (in the embodiment, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25%); 2 parts of latex powder (in the embodiment, it is specifically a mixture of polyvinyl acetate and acrylic acid in a 2:1 (mass ratio)); 0.07 part of cellulose ether; 0.7 part of sodium pyrophosphate; 200 parts of sand.
The preparation method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
weighing the components in parts by weight, and uniformly mixing to obtain the self-compacting material for repairing the railway concrete sleeper.
The use method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
the prepared self-compacting material for repairing the railway concrete sleeper is fully mixed with 15 parts of water for 2min at the rotating speed of 200r/min and then is mixed uniformly.
Through tests, the self-compacting material for repairing the railway concrete sleeper has the initial setting time of 25min, the final setting time of 40min, the 2h bonding strength of 1.2MPa, the 2h compressive strength of 56MPa, the flexural strength of 10MPa, the 28-day compressive strength of 75MPa and the flexural strength of 15 MPa. The bonding strength reaches 3.2MPa in 28 days, and the dry shrinkage rate is 0.08 percent in 28 days.
Example 3
The embodiment provides a self-compacting material for repairing a railway concrete sleeper, which comprises the following components in parts by weight:
80 parts of aluminate cement; 15 parts of gypsum; 10 parts of silica fume; 0.1 part of tartaric acid; 0.1 part of lithium carbonate; 0.1 part of water reducing agent (in the embodiment, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25%); 2 parts of latex powder (in the embodiment, the latex powder is a mixture of polyvinyl acetate and acrylic acid in a mass ratio of 3: 1); 0.035 parts of cellulose ether and 0.035 parts of starch ether; 0.5 part of sodium tripolyphosphate; and 250 parts of sand.
The preparation method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
weighing the components in parts by weight, and uniformly mixing to obtain the self-compacting material for repairing the railway concrete sleeper.
The use method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
the prepared self-compacting material for repairing the railway concrete sleeper is fully mixed with 15 parts of water for 2min at the rotating speed of 200r/min and then is mixed uniformly.
Through tests, the self-compacting material for repairing the railway concrete sleeper has the initial setting time of 10 minutes, the final setting time of 20 minutes, the 2h bonding strength of 2MPa, the 2h compressive strength of 58MPa, the flexural strength of 10MPa, the 28-day compressive strength of 90MPa and the flexural strength of 16 MPa. The bonding strength reaches 3.5MPa in 28 days, and the shrinkage rate is 0.07 percent in 28 days.
Example 4
The embodiment provides a self-compacting material for repairing a railway concrete sleeper, which comprises the following components in parts by weight:
90 parts of sulphoaluminate cement; 15 parts of gypsum; 10 parts of silica fume; 0.1 part of lithium carbonate; 0.1 part of water reducing agent (in the embodiment, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25%); 2 parts of latex powder (in the embodiment, the latex powder is a mixture of polyvinyl acetate and acrylic acid in a mass ratio of 4: 1); 0.07 part of cellulose ether; 0.8 part of sodium pentapolyphosphate; and 250 parts of sand.
The preparation method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
weighing the components in parts by weight, and uniformly mixing to obtain the self-compacting material for repairing the railway concrete sleeper.
The use method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
the prepared self-compacting material for repairing the railway concrete sleeper is fully mixed with 15 parts of water for 2min at the rotating speed of 200r/min and then is mixed uniformly.
Through tests, the self-compacting material for repairing the railway concrete sleeper has the initial setting time of 45min at 0 ℃, the final setting time of 75min, the 2h bonding strength of 1.0MPa, the 2h compressive strength of 40MPa and the flexural strength of 6.4 MPa. Initial setting time at 20 ℃ is 35min, final setting time is 50min, 2h bonding strength is 1.2MPa, 2h compressive strength is 50MPa, flexural strength is 8MPa, 28-day compressive strength is 69MPa, and flexural strength is 14 MPa. The bonding strength reaches 3.0MPa in 28 days, and the dry shrinkage rate is 0.12 percent in 28 days. Initial setting time at 40 ℃ is 15min, final setting time is 30min, 2h bonding strength is 1.5MPa, and 2h compressive strength is 58 MPa.
Comparative example 1
The comparative example provides a self-compacting material for repairing a railway concrete sleeper, which comprises the following components in parts by weight:
80 parts of Portland cement; 15 parts of gypsum; 10 parts of silica fume; 0.1 part of water reducing agent (in the embodiment, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25%); 0.1 part of lithium carbonate; 2 parts of latex powder (in the comparative example, the latex powder is polyvinyl acetate); and 250 parts of sand.
The preparation method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
weighing the components in parts by weight, and uniformly mixing to obtain the self-compacting material for repairing the railway concrete sleeper.
The use method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
the prepared self-compacting material for repairing the railway concrete sleeper is fully mixed with 30 parts of water for 2min at the rotating speed of 200r/min and then is uniformly mixed.
Tests show that the self-compacting material for repairing the railway concrete sleeper has the initial setting time of 50min, the final setting time of 65min, the 2h bonding strength of 0.5MPa, the 2h compressive strength of 15MPa, the flexural strength of 2.5MPa, the 28-day compressive strength of 35MPa and the flexural strength of 4.5 MPa. The bonding strength reaches 0.9MPa in 28 days, and the dry shrinkage rate is 0.25 percent in 28 days.
Comparative example 2
The comparative example provides a self-compacting material for repairing a railway concrete sleeper, which comprises the following components in parts by weight:
80 parts of sulphoaluminate cement; 15 parts of gypsum; 10 parts of silica fume; 0.1 part of water reducing agent (in the embodiment, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25%); 0.1 part of lithium carbonate; 2 parts of latex powder (in the comparative example, the latex powder is polyvinyl acetate); and 250 parts of sand.
The preparation method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
weighing the components in parts by weight, and uniformly mixing to obtain the self-compacting material for repairing the railway concrete sleeper.
The use method of the self-compacting material for repairing the railway concrete sleeper comprises the following steps:
the prepared self-compacting material for repairing the railway concrete sleeper is fully mixed with 30 parts of water for 2min at the rotating speed of 200r/min and then is uniformly mixed.
Tests show that the self-compacting material for repairing the railway concrete sleeper has the initial setting time of 25min, the final setting time of 48min, the 2h bonding strength of 0.7MPa, the 2h compressive strength of 25MPa, the flexural strength of 3.1MPa, the 28-day compressive strength of 40MPa and the flexural strength of 4.6 MPa. The bonding strength reaches 0.9MPa in 28 days, and the dry shrinkage rate is 0.21 percent in 28 days
Comparing comparative examples 1 and 2 with the examples, it can be seen that the water demand of the material is increased by more than 50%, and the early and late strengths are both greatly reduced. The main reason is that the comparative examples 1 and 2 do not contain a dispersing agent and a thickening water-retaining agent, so that the material system has poor dispersibility and no self-curing performance, the water requirement of the system is large, the later strength is low, the dry shrinkage is increased, and the working performance and the construction time of the material are reduced.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (12)
1. The self-compacting material for repairing the railway concrete sleeper is characterized by comprising the following components in parts by weight:
70-100 parts of cement; 6-15 parts of gypsum; 8-15 parts of mineral admixture; 0.1-1 part of coagulation regulating component; 0.1-0.3 part of water reducing agent; 1-8 parts of latex powder; 0.3-1 part of surfactant; 0.03-0.1 part of thickening and water-retaining agent; 100 portions and 300 portions of sand.
2. A self-compacting material for repairing railway concrete sleepers as claimed in claim 1, wherein said cement is selected from any one or two of portland cement, aluminate cement and sulphoaluminate cement; the gypsum is dihydrate gypsum or anhydrite; the mineral admixture is selected from at least one of silica fume, metakaolin, fly ash, mineral powder and kaolin; the coagulation regulating component is at least one selected from lithium salt, calcium formate, calcium nitrite, tartaric acid, citric acid, boric acid and oxalic acid.
3. The self-compacting material for repairing a railway concrete sleeper as claimed in claim 1, wherein said water-reducing agent is a polycarboxylic acid water-reducing agent; the latex powder is selected from at least one of polyvinyl acetate and acrylic acid; the surfactant is selected from inorganic salt phosphate; the thickening and water-retaining agent is one or two of cellulose ether, starch ether or bentonite-based thickening and water-retaining agent; the sand is quartz sand without soil, and the fineness modulus of the sand is 2.3-2.5.
4. The self-compacting material for repairing a railway concrete sleeper as claimed in claim 3, wherein the water reducing rate of the polycarboxylic acid water reducing agent is not less than 25%; when the latex powder is selected from polyvinyl acetate and acrylic acid, the weight ratio of the polyvinyl acetate to the acrylic acid is 2: 1-4: 1; the surfactant is selected from at least one of potassium pyrophosphate, sodium pyrophosphate, potassium polyphosphate, sodium polyphosphate and sodium metaphosphate; when the thickening and water-retaining agent comprises cellulose ether and starch ether, the weight ratio of the cellulose ether to the starch ether is 1.5-2.5.
5. The self-compacting material for repairing a railway concrete sleeper as claimed in claim 1, wherein the self-compacting material for repairing a railway concrete sleeper has a 2h bonding strength of 1.0MPa or more, a 2h compressive strength of 50MPa or more, a flexural strength of 5MPa or more, a 28-day compressive strength of 65MPa or more, a flexural strength of 10MPa or more, and a 28-day bonding strength of 2.5MPa or more.
6. A method for preparing a self-compacting material for repairing railway concrete sleepers according to any one of claims 1 to 5, comprising the steps of:
weighing the components in parts by weight, and uniformly mixing to obtain the self-compacting material for repairing the railway concrete sleeper.
7. Use of a self-compacting material for repairing railway concrete sleepers according to any one of claims 1 to 5, characterized in that it comprises the following steps:
and (3) fully mixing water and the self-compacting material for repairing the railway concrete sleeper for 2-3 min according to the weight ratio of 0.15-0.25, and uniformly mixing.
8. The method of claim 7 wherein said blending is performed at a speed of 100-200 r/min.
9. A method of constructing a self-compacting material for repairing railway concrete sleepers as claimed in any one of claims 1 to 5, comprising the steps of:
1) chiseling loose concrete and aggregate particles at the damaged part of the structure to form a pitted surface new stubble, and then removing impurities on the pitted surface new stubble to obtain a clean interface;
2) wiping the interface obtained in the step 1) with a wet rag, and then brushing an interface agent with a brush;
3) erecting the template, and sealing the gap of the template by using an adhesive tape;
4) standing the self-compacting material for repairing the railway concrete sleeper for 2-3 minutes, and stirring for 1-2 min to obtain a repairing material;
5) pouring the mixed repairing material in the step 4) into the template in the step 3);
6) and (4) after the material is hardened, removing the template, and repairing and grinding the mortar to be flat.
10. The method as claimed in claim 9, wherein when the damaged portion is a shoulder portion, the method further comprises the step of removing all the tie fasteners and fittings before step 1) so that the tie is no longer under pressure.
11. The construction method according to claim 9, further comprising a step of performing rust removal and prevention treatment on the steel bars after step 1) and before step 2) when the steel bars are exposed at the damaged portion of the structure.
12. The method as claimed in claim 9, wherein the step of removing the impurities on the new stubble of the dough sheet in step 1) comprises removing dust or debris on the new stubble of the dough sheet by using a wire brush, a vacuum cleaner or compressed air; the interface agent in the step 2) is polymer cement paste; in the step 4), the stirring speed is 100-200 r/min.
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| CN114182589A (en) * | 2021-12-29 | 2022-03-15 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for rapidly repairing damage of sleeper of heavy haul railway |
| CN114960328A (en) * | 2022-05-27 | 2022-08-30 | 广西北投交通养护科技集团有限公司 | Method for repairing old cement concrete pavement |
| WO2022185102A1 (en) * | 2021-03-05 | 2022-09-09 | Overail S.R.L. | Concrete composition for railway foundations |
| CN115710476A (en) * | 2022-11-14 | 2023-02-24 | 佛山市鲸砼科技有限公司 | Quick-drying high-strength non-shrinkage rock plate ceramic tile adhesive |
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| CN115710476A (en) * | 2022-11-14 | 2023-02-24 | 佛山市鲸砼科技有限公司 | Quick-drying high-strength non-shrinkage rock plate ceramic tile adhesive |
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