CN113213813A - Asphalt concrete applied to prefabricated elastic ballast bed structure, sample and preparation method - Google Patents
Asphalt concrete applied to prefabricated elastic ballast bed structure, sample and preparation method Download PDFInfo
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- CN113213813A CN113213813A CN202110436620.XA CN202110436620A CN113213813A CN 113213813 A CN113213813 A CN 113213813A CN 202110436620 A CN202110436620 A CN 202110436620A CN 113213813 A CN113213813 A CN 113213813A
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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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
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
-
- 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
- C04B2111/50—Flexible or elastic materials
- C04B2111/503—Elastic materials
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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
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/09—Ballastless systems
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
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- Architecture (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Road Paving Structures (AREA)
Abstract
The invention provides asphalt concrete applied to a prefabricated elastic ballast bed structure, a sample and a preparation method, wherein the asphalt concrete comprises 5-10 parts of polymer modified asphalt, 100 parts of aggregate, 2-10 parts of waste rubber particles and 1-2 parts of TOR coupling agent; the maximum grain size corresponding to the gradation of the aggregate is more than 25 mm; the polymer modified asphalt is TPS high-viscosity modified asphalt or SBS/rubber powder composite modified asphalt. Compared with common ballastless track cement concrete materials with higher rigidity and ballast track graded broken stone granular material materials in railway track structures, the asphalt concrete has lower rigidity, good bearing capacity and stress dispersion capacity. Meanwhile, the feasibility of the asphalt concrete applied to the cured ballast bed is verified, and the technical requirements of the assembled elastic cured ballast bed are met.
Description
Technical Field
The invention belongs to the technical field of track traffic solidified ballast beds, and particularly relates to asphalt concrete applied to a prefabricated elastic ballast bed structure, a sample and a preparation method.
Background
The common structure of the railway track structure comprises a slab ballastless track structure, a ballast track structure and a polyurethane elastic curing ballast bed, but all have defects: 1) the slab ballastless track has the advantages of good durability, good linear stability, convenient construction and the like, but the concrete ballastless track is a rigid bearing layer, and when the bearing strength limit is reached, the concrete ballastless track is broken, and the geometric dimension of the track is suddenly changed or an unexpected deterioration condition occurs, so that the maintenance of the concrete ballastless track as a rigid structure is more costly; 2) the ballast track structure has the advantages of low cost, wide application range, high construction speed and the like, however, the insufficient long-term stability of the track bed and the ballast splashing of the high-speed railway are the main problems existing in the ballast track bed of the ballast track: the ballast track bed is used as a granular body structure and can generate larger accumulated deformation under a low confining pressure state during operation service; secondly, when a high-speed train runs, high negative pressure air appears on the surface of the ballast bed, so that railway ballast is easy to splash, a track and a train are endangered, and the running safety is influenced; 3) in order to solve the defects of a slab ballastless track and a ballast track, an elastic curing ballast bed represented by polyurethane is gradually developed and applied, has enough strength and stability, and has the advantages of slow residual accumulated deformation of a concrete monolithic ballast bed, good elasticity of a granular broken stone ballast bed, good maintainability, reduction of maintenance workload and the like, but the polyurethane curing ballast bed also has the problems of high manufacturing cost, strict on-site pouring conditions and process requirements and the like, and restricts the further development of the polyurethane curing ballast bed.
Therefore, there is a need in the art for a resilient ballast bed structure that addresses the above-mentioned deficiencies.
Disclosure of Invention
The invention aims to provide asphalt concrete applied to a prefabricated elastic ballast bed structure, a sample and a preparation method. In order to achieve the purpose, the invention adopts the following technical scheme:
the asphalt concrete applied to the prefabricated elastic ballast bed structure comprises the following components in parts by weight: 5-10 parts of polymer modified asphalt, 100 parts of aggregate, 2-10 parts of waste rubber particles and 1-2 parts of TOR coupling agent;
the maximum grain size corresponding to the gradation of the aggregate is more than 25 mm; the polymer modified asphalt is TPS high-viscosity modified asphalt or SBS/rubber powder composite modified asphalt.
Preferably, the aggregate is graded as any one of AC-25, AC-30, ATB-25 or ATB-30.
Preferably, the particle size range of the waste rubber particles is 2.36-4.75 mm.
Preferably, the waste rubber particles are formed by a physical crushing method.
The asphalt concrete sample comprises the asphalt concrete applied to the prefabricated elastic ballast bed structure and also comprises emulsified asphalt cement.
A preparation method of an asphalt concrete sample comprises the following steps:
step 1: heating aggregate in an environment of 180-190 ℃, adding waste rubber particles, dry-mixing for 15-30 s, adding polymer modified asphalt, mixing for 45-60 s, then adding a TOR coupling agent, and mixing for 30-60 s to obtain the asphalt concrete applied to the prefabricated elastic track bed structure;
step 2: putting the asphalt concrete into a high-temperature environment of 180 ℃ for development, wherein the development time is 30-60 min;
and step 3: putting the asphalt concrete into a mold, rolling the asphalt concrete, and compacting to a height of 7-8 cm to form an Nth layer of the asphalt concrete sample; wherein N is a natural number and is more than or equal to 1;
and 4, step 4: coating emulsified asphalt cement on the surface of asphalt concrete; step 1 is then performed.
Preferably, the asphalt concrete is compacted on the basis of a small roller.
Preferably, in step 3, the asphalt concrete is laid in the mould in a calculated loose thickness.
Compared with the prior art, the invention has the advantages that: by adding the waste rubber particles, the TOR coupling agent and the emulsified asphalt cement, the elastic restoring force of the asphalt mixture in the prior art is improved, and the rigidity is reduced. Compared with common ballastless track cement concrete materials with higher rigidity and ballast track graded broken stone granular material materials in railway track structures, the asphalt concrete has lower rigidity, good bearing capacity and stress dispersion capacity. Meanwhile, the feasibility of the asphalt concrete applied to the cured ballast bed is verified, and the technical requirements of the assembled elastic cured ballast bed are met.
Drawings
FIG. 1 is a graph comparing the cumulative deformation results of a sample in the first embodiment of the present invention, a sample in the second embodiment of the present invention, and a sample of a polyester shore-cured ballast bed in the prior art under the action of three million uniaxial repeated loads;
FIG. 2 is a graph comparing the modulus change results of the sample in example one, the sample in example two, and the sample of the polyester shore-cured ballast bed in the prior art under three million uniaxial repeated loads.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying schematic drawings, in which preferred embodiments of the invention are shown, it being understood that one skilled in the art may modify the invention herein described while still achieving the advantageous effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
Example 1
The asphalt concrete applied to the prefabricated elastic ballast bed structure comprises the following components in parts by weight: 5 parts of polymer modified asphalt, 100 parts of aggregate, 4 parts of waste rubber particles (with the first mixing amount) and 2 parts of TOR coupling agent. In this embodiment, the asphalt concrete applied to the prefabricated elastic track bed structure is also called rubber particle asphalt mixture. In this embodiment, the asphalt concrete applied to the prefabricated elastic track bed structure is also called rubber particle asphalt mixture.
Wherein, aggregate selection: the aggregate is limestone or basalt; the grading of the aggregate is ATB-30; the aggregate grading corresponds to a maximum particle size of greater than 25 mm. In this embodiment, the aggregate grading nominal maximum particle size is required to be above 25mm to meet the vertical long-term stability requirement of the prefabricated elastic ballast bed structure. The void ratio of the asphalt concrete is controlled below 2 percent.
The polymer modified asphalt is SBS/rubber powder composite modified asphalt, and aims at adhering rubber grains and aggregate into one integral, raising the adhesion of asphalt concrete, preventing diseases, such as loosening, and ensuring the long-term durability of the material.
Selecting waste rubber particles: the particle size range is 2.36-4.75 mm, the Shore A hardness is not lower than 55, the elastic modulus is not lower than 11MPa, and the content of flat and long-thin particles is not higher than 10%, so that the asphalt concrete added with the rubber particles has good physical and mechanical properties and long-term stability. Wherein the waste rubber particles are formed by a physical crushing method. Specifically, the physical crushing method is to physically crush natural or synthetic rubber automobile tires to form rubber particles. Compared with the waste rubber particle pre-compounded rubber particle, the process is simple and the cost is lower. Wherein, as can be known by the technical personnel in the field, the waste rubber particles adopt an equal volume method to replace aggregates with the particle sizes of 2.36-4.75 mm and 4.75-9.5 mm.
The TOR coupling agent is a domestic or imported TOR coupling agent, and aims to activate waste rubber particles so as to strengthen the reaction between the waste rubber particles and polymer modified asphalt, improve the compatibility between the waste rubber particles and the polymer modified asphalt, finally improve the adhesion between the waste rubber particles and the asphalt, and improve the stability and durability of an asphalt concrete road bed structure.
The embodiment also provides an asphalt concrete sample which is made of the asphalt concrete applied to the prefabricated elastic roadbed structure and also comprises emulsified asphalt cement.
The preparation method of the asphalt concrete sample is that the sample is a cubic structure with the size of 0.35m 0.25m, and comprises the following specific steps:
step 1: weighing 5 parts of polymer modified asphalt, 100 parts of aggregate, 4 parts of waste rubber particles, 2 parts of emulsified asphalt cement and 2 parts of TOR coupling agent according to the following parts by weight. In other embodiments other than this embodiment, the emulsified asphalt cement is 3 to 4 parts.
And then placing the aggregate in a high-temperature environment of 180 ℃ for heating and drying for 4h, adding waste rubber particles into the dried aggregate, dry-mixing for 15s, adding polymer modified asphalt, mixing for 60s, then adding a TOR coupling agent, mixing for 30s, and thus obtaining the asphalt concrete applied to the prefabricated elastic track bed structure. In the step, the procedure of dry mixing the aggregate and the waste rubber particles is to uniformly mix the waste rubber particles and carbonize the surfaces of the waste rubber particles. Specifically, the rubber particles are contacted with the surface of the high-temperature aggregate to cause carbonization of the rubber particles, so that the reaction of the rubber particles and asphalt is facilitated, the reaction of the rubber particles and polymer modified asphalt is enhanced, and the adhesion of asphalt concrete is improved.
Step 2: and (3) putting the asphalt concrete into a high-temperature environment of 180 ℃ for development, wherein the development time is 60 min.
And step 3: calculating the quality of the required asphalt concrete according to the mould; then, a layering forming method is adopted, and the compaction thickness, the compaction times, the compaction temperature and the interlamination are designed.
The layering forming method comprises the following steps: the method comprises the steps of paving asphalt concrete indoors in a mold, rolling the asphalt concrete, setting a preset compaction height of 7cm, rolling the asphalt concrete through a small road roller until the compaction degree is greater than 98%, and stopping rolling to form the layer 1 of the asphalt concrete sample.
And 4, step 4: and (3) brushing the emulsified asphalt cement on the surface of the 1 st layer of asphalt concrete, and then repeatedly executing the steps 1-4 until the required height of the sample is reached. The emulsified asphalt cementing material is used as an interlayer binding material to ensure the interlayer stability and durability of the test sample.
And 5: the mechanical properties of the test specimens were evaluated according to the test method specified in "temporary technical conditions for fabricated polyurethane elastic ballast bed blocks" (TJ/GW 164-2020) of the national railroad group ltd.
Example 2
Based on the example 1, 6 parts (the second mixing amount) of the waste rubber particles are weighed, and the rest parts by weight and the components are the same as those in the example 1.
As shown in FIG. 1, the accumulated deformation of the asphalt concrete specimen applied to the prefabricated elastic track bed under the action of 300 ten thousand uniaxial repeated loads is within the specification requirement of the elastic track bed, and the accumulated deformation of the asphalt concrete specimen with the second mixing amount is smaller than that of the polyurethane cured track bed specimen, which indicates that the asphalt concrete has excellent elastic recovery capability and can be used as a material of a cured track bed structure. As shown in fig. 2, after the rubber particles are added into the asphalt concrete sample applied to the prefabricated elastic track bed, the static modulus of the asphalt concrete sample is greatly reduced, and the highest modulus of the asphalt concrete sample with the first doping amount is 320MPa, which is close to the specification requirement of the solidified track bed; the modulus of the asphalt concrete sample with the second mixing amount is only about 170MPa at most and is greatly smaller than the standard requirement of the solidified track bed, which shows that the rigidity of the asphalt concrete is greatly reduced, and the requirement of the railway track bed is met.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The asphalt concrete applied to the prefabricated elastic ballast bed structure is characterized by comprising the following components in parts by weight: 5-10 parts of polymer modified asphalt, 100 parts of aggregate, 2-10 parts of waste rubber particles and 1-2 parts of TOR coupling agent;
the maximum grain size corresponding to the gradation of the aggregate is more than 25 mm; the polymer modified asphalt is TPS high-viscosity modified asphalt or SBS/rubber powder composite modified asphalt.
2. The asphalt concrete applied to a precast elastic ballast bed structure according to claim 1, wherein the gradation of the aggregate is any one of AC-25, AC-30, ATB-25 or ATB-30.
3. The asphalt concrete applied to the prefabricated elastic ballast bed structure according to claim 1, wherein the particle size of the waste rubber particles is in the range of 2.36-4.75 mm.
4. The asphalt concrete for a prefabricated elastic ballast bed structure according to claim 1, wherein the waste rubber particles are formed by a physical crushing method.
5. An asphalt concrete sample, characterized by comprising the asphalt concrete applied to a prefabricated elastic ballast bed structure according to any one of claims 1 to 4, and further comprising an emulsified asphalt cement.
6. A method for preparing an asphalt concrete sample according to claim 5, comprising the steps of:
step 1: heating aggregate in an environment of 180-190 ℃, adding waste rubber particles, dry-mixing for 15-30 s, adding polymer modified asphalt, mixing for 45-60 s, then adding a TOR coupling agent, and mixing for 30-60 s to obtain the asphalt concrete applied to the prefabricated elastic track bed structure;
step 2: putting the asphalt concrete into a high-temperature environment of 180 ℃ for development, wherein the development time is 30-60 min;
and step 3: putting the asphalt concrete into a mold, rolling the asphalt concrete, and compacting to a height of 7-8 cm to form an Nth layer of the asphalt concrete sample; wherein N is a natural number and is more than or equal to 1;
and 4, step 4: coating emulsified asphalt cement on the surface of asphalt concrete; step 1 is then performed.
7. The method for preparing the asphalt concrete sample according to claim 6, wherein in step 3, the asphalt concrete is compacted based on a small-sized roller.
8. The method for preparing an asphalt concrete sample according to claim 6, wherein in step 3, the asphalt concrete is spread in a mold in a calculated thickness.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110436620.XA CN113213813B (en) | 2021-04-22 | 2021-04-22 | Asphalt concrete applied to prefabricated elastic ballast bed structure, sample and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110436620.XA CN113213813B (en) | 2021-04-22 | 2021-04-22 | Asphalt concrete applied to prefabricated elastic ballast bed structure, sample and preparation method |
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| CN113213813A true CN113213813A (en) | 2021-08-06 |
| CN113213813B CN113213813B (en) | 2022-06-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956670A (en) * | 2022-05-13 | 2022-08-30 | 东南大学 | Prefabricated epoxy asphalt elastic ballast bed for high-speed railway bridge transition section |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3867161A (en) * | 1972-09-26 | 1975-02-18 | Japan National Railway | Cement asphalt ballast grout composition for track |
| CN101967048A (en) * | 2010-05-20 | 2011-02-09 | 南京东交工程检测有限公司 | Rubber modified asphalt mixture and preparation and construction methods thereof |
| CN103396043A (en) * | 2013-07-29 | 2013-11-20 | 扬州大学 | Warmly-mixed TOR (trans-polyoctenamer rubber reactive modifier) rubber asphalt mixture and preparation method thereof |
| CN107522429A (en) * | 2017-08-18 | 2017-12-29 | 北京交通大学 | A kind of prefabricated railway ballast pitch track and preparation method thereof |
| CN107558309A (en) * | 2017-09-26 | 2018-01-09 | 武汉理工大学 | A kind of vibration damping thermal insulation type unit plate type ballastless track structure |
| CN110550885A (en) * | 2018-05-30 | 2019-12-10 | 江苏一诺路桥工程检测有限公司 | Semi-rigid track bed material for high-speed railway ballastless track and preparation method thereof |
-
2021
- 2021-04-22 CN CN202110436620.XA patent/CN113213813B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3867161A (en) * | 1972-09-26 | 1975-02-18 | Japan National Railway | Cement asphalt ballast grout composition for track |
| CN101967048A (en) * | 2010-05-20 | 2011-02-09 | 南京东交工程检测有限公司 | Rubber modified asphalt mixture and preparation and construction methods thereof |
| CN103396043A (en) * | 2013-07-29 | 2013-11-20 | 扬州大学 | Warmly-mixed TOR (trans-polyoctenamer rubber reactive modifier) rubber asphalt mixture and preparation method thereof |
| CN107522429A (en) * | 2017-08-18 | 2017-12-29 | 北京交通大学 | A kind of prefabricated railway ballast pitch track and preparation method thereof |
| CN107558309A (en) * | 2017-09-26 | 2018-01-09 | 武汉理工大学 | A kind of vibration damping thermal insulation type unit plate type ballastless track structure |
| CN110550885A (en) * | 2018-05-30 | 2019-12-10 | 江苏一诺路桥工程检测有限公司 | Semi-rigid track bed material for high-speed railway ballastless track and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956670A (en) * | 2022-05-13 | 2022-08-30 | 东南大学 | Prefabricated epoxy asphalt elastic ballast bed for high-speed railway bridge transition section |
| CN114956670B (en) * | 2022-05-13 | 2023-07-14 | 东南大学 | Prefabricated epoxy asphalt elastic ballast bed for transition section of high-speed railway bridge |
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| CN113213813B (en) | 2022-06-07 |
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