CN114315277A - Recycled aggregate and rubber particle filled vibration-damping sleeper and preparation method thereof - Google Patents
Recycled aggregate and rubber particle filled vibration-damping sleeper and preparation method thereof Download PDFInfo
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- CN114315277A CN114315277A CN202111662722.XA CN202111662722A CN114315277A CN 114315277 A CN114315277 A CN 114315277A CN 202111662722 A CN202111662722 A CN 202111662722A CN 114315277 A CN114315277 A CN 114315277A
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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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Abstract
The invention relates to a vibration damping sleeper filled with recycled aggregate and rubber particles and a preparation method thereof, wherein the vibration damping sleeper comprises a steel fiber concrete sleeper body, a cavity arranged in the steel fiber concrete sleeper body, a steel wire cage attached to the inner wall of the cavity, and recycled aggregate/rubber filler filled in the steel wire cage; wherein the recycled aggregate/rubber filler comprises rubber particles and recycled aggregate particles in a volume ratio of (1-3): 100. Compared with the prior art, the damping sleeper provided by the invention has the advantages that the main body part is constructed by the steel fiber concrete, the interior of the damping sleeper is densely filled by the recycled aggregate particles and the recycled rubber particles, the tensile strength and the anti-cracking performance of the concrete are improved by utilizing the steel fibers, the damping sleeper has better bearing capacity while being filled by the loose materials, meanwhile, the sliding of the recycled aggregate particles filled in the damping sleeper under the load action can reduce the vibration energy of the train in running, and the rubber particles further weaken the vibration and can be used for track laying of the train and the tramcar.
Description
Technical Field
The invention belongs to the technical field of civil engineering materials, and relates to a recycled aggregate and rubber particle filled vibration damping sleeper and a preparation method thereof.
Background
The train traveles and can lead to the railway ballast to splash, simultaneously because the railway ballast is unrestrained, can produce great deformation under the load effect, leads to the smooth-going relatively poor of train going, and is stable not good simultaneously. Thus, concrete foundations are used in high-grade railways to replace ballastless tracks of loose gravel beds. The train running can apply vibration load to the road surface, and how to reduce the vibration and improve the riding comfort is an important problem of railway design. The concrete foundation is adopted to replace a loose gravel road bed, so that the rigidity of the railway is increased, and the vibration is more obvious.
In view of the requirements for vibration reduction in the railway, the attention on cost and the requirements on environmental protection, a method for reducing the vibration generated by train running by using the damping performance of the sleeper through the design of structural members is needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a recycled aggregate and rubber particle filled vibration damping sleeper and a preparation method thereof, which are used for realizing vibration control of railway engineering.
The purpose of the invention can be realized by the following technical scheme:
a vibration damping sleeper filled with recycled aggregate and rubber particles comprises a steel fiber concrete sleeper body, a cavity arranged in the steel fiber concrete sleeper body, a steel wire cage attached to the inner wall of the cavity, and recycled aggregate/rubber filler filled in the steel wire cage;
the recycled aggregate/rubber filler comprises rubber particles and recycled aggregate particles in a volume ratio of (1-3): 100.
Further, the steel fiber concrete sleeper body is formed by pouring steel fiber concrete materials, and the steel fiber concrete materials comprise the following components in parts by weight:
1 part of cement; 2.4-3.6 parts of coarse aggregate; 1.3-2.5 parts of river sand; 0.3-0.4 part of water; 0.05-0.11 part of steel fiber; 0.004 to 0.021 portion of water reducing agent.
Further, the cement is P.O 42.5.5-grade ordinary portland cement; the fineness modulus of the river sand is 2.4-3.1; the water reducing agent is a polycarboxylic acid water reducing agent with the water reducing rate of 25-50%.
Furthermore, the steel fiber is corrugated steel fiber or end hook type steel fiber, the diameter is 0.2-0.6mm, and the length is 10-30 mm.
Furthermore, the recycled aggregate particles are I-type recycled aggregates or II-type recycled aggregates, and the particle size is 5-25 mm.
Furthermore, the rubber particles are ethylene propylene diene monomer particles, and the particle size is 2-4 mm.
Furthermore, the steel wire cage is formed by weaving and enclosing a plurality of steel wires which are perpendicular to each other or arranged in parallel, the size of the steel wire cage is the same as that of a cavity in the sleeper body, the diameter of the used steel wires is 2-4mm, and the distance between the steel wires is 25-75 mm.
Further, the wall thickness of the cavity is not less than 60 mm.
A preparation method of a vibration-damping sleeper filled with recycled aggregate and rubber particles comprises the following steps:
1) pouring, maintaining and forming the sleeper bottom plate, the side walls and the partition to form cavity side walls;
2) mixing the rubber particles with recycled aggregate particles to obtain recycled aggregate/rubber filler; placing a steel wire cage at the position of the cavity, and filling recycled aggregate/rubber filler;
3) and pouring, maintaining and molding the top surface of the sleeper, and obtaining the vibration-damping sleeper.
Further, in the step 3), before the top surface of the sleeper is poured, coarse sand is paved on the top surface of the recycled aggregate/rubber filler, and then pouring is performed.
The particle material is a better buffer material, can well disperse and consume the load of the train, protects the road surface, and can reduce the vibration of the train in running to a certain extent. The friction is generated between the loosely piled particles under dynamic load, and meanwhile, the deformation of the particle structure is caused by the deformation of the particle structure, so that the particle system is unrecoverable and has smaller elastic deformation, and therefore, the particle system has better energy consumption capability. Meanwhile, the stress is dissipated through plastic deformation and is discontinuous, so that the damage phenomena such as fracture and the like cannot be generated.
The steel fiber can disperse the tensile stress to a wider area, reduce local stress concentration and improve the tensile capacity of the concrete. The modified asphalt can be added into recycled concrete to play a role in improving the tensile strength of the concrete, preventing the concrete from cracking and improving the ductility of the concrete. According to the invention, the granular material is filled into the steel fiber concrete shell with better constraint capability, so that better constraint can be provided for the granular material, the bearing capacity of the steel fiber concrete shell is improved, and the deformation of the steel fiber concrete shell is reduced.
The recycled aggregate is prepared from waste concrete, is an environment-friendly material, and is used as filling particles, so that the concept of environmental protection is met. The rubber particles are a good damping material, and when the rubber particles are mixed into the recycled aggregate, the rubber particles can well dissipate the energy of vibration through the deformation of the rubber particles when the load change is small and the possibility of large deformation cannot be caused in the recycled aggregate, so that the vibration of a train in running is reduced.
The invention aims to provide a recycled aggregate and rubber particle filled vibration damping sleeper which have low production cost, good vibration damping performance, simple process and environmental protection, and can be used for improving the vibration damping performance of ballastless tracks, considering the vibration damping performance of the particle material, the environmental protection significance of the recycled aggregate, the low price of the particle material, the lifting effect of the steel fiber on concrete and the vibration damping effect of the rubber particles.
Compared with the prior art, the invention has the following characteristics:
1) the main body part of the vibration-damping sleeper provided by the invention is constructed by steel fiber concrete, the interior of the sleeper is densely filled by regenerated aggregate particles and regenerated rubber particles, the tensile strength and the cracking resistance of the concrete are improved by utilizing the steel fibers, the sleeper has better bearing capacity while being filled by loose materials, meanwhile, the sliding of the regenerated aggregate particles filled in the sleeper under the load action can reduce the vibration energy in the running process of a train, and the rubber particles further weaken the vibration and can be used for laying the tracks of the train and the tramcar;
2) the recycled aggregate and the recycled rubber adopted by the invention are respectively prepared from the waste concrete and the waste tire after the building is dismantled, so that the consumption of the natural coarse aggregate can be saved, the treatment cost and the energy consumption of the waste concrete can be reduced, and the economic and environmental benefits are higher.
Drawings
FIG. 1 and FIG. 2 are schematic structural views of a vibration-damping sleeper filled with recycled aggregate and rubber particles in example 1;
FIG. 3 is a graph showing the vibration load applied in example 4;
FIG. 4 is the strain energy of the damped sleeper prepared in example 1;
FIG. 5 is the strain energy of the damped sleeper prepared in example 2;
FIG. 6 is the strain energy of the damped sleeper prepared in example 3;
FIG. 7 is a strain energy of a vibration damped sleeper prepared in comparative example;
the notation in the figure is:
1-steel fiber concrete sleeper body, 2-steel wire cage and 3-recycled aggregate/rubber filler.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
A vibration damping sleeper filled with recycled aggregate and rubber particles comprises a steel fiber concrete sleeper body 1, a cavity arranged in the steel fiber concrete sleeper body 1, a steel wire cage 2 attached to the inner wall of the cavity, and a recycled aggregate/rubber filler 3 filled in the steel wire cage 2;
the preparation method comprises the following steps:
1) preparing a steel fiber concrete material according to the following component ratio:
1 part of cement; 2.4-3.6 parts of coarse aggregate; 1.3-2.5 parts of river sand; 0.3-0.4 part of water; 0.05-0.11 part of steel fiber; 0.004-0.021 part of water reducing agent;
wherein, the cement is P.O 42.5.5-grade ordinary portland cement; the rubber particles are ethylene propylene diene monomer particles, and the particle size is 2-4 mm; the recycled aggregate particles are I-type recycled aggregates or II-type recycled aggregates, and the particle size is 5-25 mm; the fineness modulus of the river sand is 2.4-3.1; the water reducing agent is a polycarboxylic acid water reducing agent with the water reducing rate of 25-50%; the steel fiber is corrugated steel fiber or end hook type steel fiber, the diameter is 0.2-0.6mm, and the length is 10-30 mm;
2) adopting a steel fiber concrete material to pour the sleeper bottom plate, the side wall and the partition on the bottom plate, and curing for 14 days to obtain the sleeper bottom plate and the cavity side wall; preferably, the wall thickness of the cavity is not less than 60 mm;
3) adding half of the total amount of the recycled aggregate particles into the stirrer, adding all the rubber particles, adding the remaining half of the total amount of the recycled aggregate particles, and fully stirring to obtain recycled aggregate/rubber filler;
wherein the volume ratio of the rubber particles to the recycled aggregate particles is (1-3) to 100;
4) weaving a plurality of steel wires in a criss-cross manner to obtain a steel wire cage 2; wherein the diameter of the used steel wires is 2-4mm, and the distance between the steel wires is 25-75 mm;
5) placing the steel wire cage 2 in the cavity position, and filling the cavity with recycled aggregate/rubber filler;
6) paving a layer of coarse sand on the top surface of the recycled aggregate/rubber filler, leveling, pouring a steel fiber concrete material on the layer of coarse sand, curing for 28 days to form the top of the sleeper, and obtaining the recycled aggregate and rubber particles to fill the vibration-damping sleeper.
The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
the recycled aggregate and rubber particle filled damping sleeper shown in fig. 1 and 2 comprises a steel fiber concrete sleeper body 1 formed by pouring C30 concrete, a cavity arranged in the steel fiber concrete sleeper body 1, a steel wire cage 2 attached to the inner wall of the cavity, and a recycled aggregate/rubber filler 3 filled in the steel wire cage 2. Wherein the width of the damping sleeper is 2240mm, the height is 250mm, the height of the cross section under the rail is 200mm, the height of the cross section of the middle part is 175mm, 7 cavities are arranged in the damping sleeper, and the cross section size is 180 multiplied by 100mm in sequence2，330×100mm2，180×100mm2，660×100mm2，180×100mm2，330×100mm2And 180X 100mm2。
The preparation method of the vibration-damping sleeper comprises the following steps:
1) preparing a steel fiber concrete material according to the following component ratio:
1 part of cement; 0.3 part of natural coarse aggregate, which is crushed stone with the particle size of 5-25mm from Shanghai city building materials GmbH; 2.7 parts of recycled coarse aggregate, wherein the particle size is 5-25mm, and the recycled coarse aggregate is I-type recycled aggregate; 2.3 parts of river sand; 0.4 part of water; 0.03 part of steel fiber; 0.008 part of a water reducing agent; wherein, the cement is P.O 42.5.5-grade ordinary portland cement; the river sand adopts medium sand (fineness modulus is 2.4-3.1); the water reducing agent is FOX-C1029 polycarboxylate water reducing agent with the water reducing rate of 30%; the steel fiber is corrugated steel fiber with diameter of 0.3-0.6mm and length of 20-30 mm.
2) Adopting a steel fiber concrete material to pour the sleeper bottom plate, the side wall and the partition on the bottom plate, and curing for 14 days to obtain the sleeper bottom plate and the cavity side wall; wherein the wall thickness of the cavity is 60 mm;
3) adding half of the total amount of the recycled aggregate particles into the stirrer, adding all the rubber particles, adding the remaining half of the total amount of the recycled aggregate particles, and fully stirring to obtain recycled aggregate/rubber filler;
wherein the volume ratio of the rubber particles to the recycled aggregate particles is 1.2:100, the rubber particles are ethylene propylene diene monomer rubber particles with the particle size of 2-4mm, and the recycled aggregate particles are I-type recycled aggregates with the particle size of 5-25 mm;
4) weaving a plurality of steel wires in a criss-cross manner to obtain a steel wire cage 2; wherein the diameter of the used steel wires is 4mm, and the distance between the steel wires is 25 mm;
5) placing the steel wire cage 2 in the cavity position, and filling the cavity with recycled aggregate/rubber filler;
6) paving a layer of coarse sand on the top surface of the recycled aggregate/rubber filler, leveling, pouring a steel fiber concrete material on the layer of coarse sand, curing for 28 days to form the top of the sleeper, and obtaining the recycled aggregate and rubber particles to fill the vibration-damping sleeper.
Example 2:
in this example, the recycled aggregate particles in the recycled aggregate/rubber filler are group II recycled aggregates, and the rest is the same as in example 1.
Example 3:
in this example, the volume ratio of the rubber particles to the recycled aggregate particles was 2.4:100, and the rest of the example was the same as example 1.
Comparative example:
in this comparative example, the sleepers were cast of concrete. 1 part of cement; 3.0 parts of natural coarse aggregate and crushed stone with the particle size of 5-25 mm; 2.3 parts of river sand; 0.4 part of water; 0.008 parts of a water reducing agent. The rest is the same as example 1.
In the embodiment, based on the vibration-damping sleeper prepared in the embodiments 1 to 3 and the comparative example, an equal-proportion simulation plane model is built by adopting PFC software, concrete of a sleeper rail shell is simulated by adopting a parallel bonding model, and a dynamic calculation method is used. This method is based on newton's second law, i.e., F ═ ma and force versus displacement. The contact between the particles simulating the concrete shell can be damaged in two forms of shearing and opening, and the change of the contact state of the particles determines the constitutive relation of the concrete. The specific calculation method can be found in PFC 6.0 documentation. The natural coarse aggregate has a density of 2400kg/m3The recycled coarse aggregate has a density of 2600kg/m3The rubber density was 1300kg/m3The elastic modulus of concrete is 30GPa, and the elastic modulus of steel fiber is 190 GPa. Applying a sinusoidal load at the rail location, the load being shown in fig. 3, the performance of the tie under the vibratory load applied by the train is obtained with the following results:
the dynamic response of the sleeper under the vibration load is represented by the kinetic energy of the sleeper, smaller kinetic energy represents smaller vibration, and the attenuation of the kinetic energy represents the vibration energy consumption capacity. The change of the kinetic energy under the vibration load of the example 1 is shown in fig. 4, the change of the kinetic energy under the vibration load of the example 2 is shown in fig. 5, the change of the kinetic energy under the vibration load of the example 3 is shown in fig. 6, and the change of the kinetic energy under the vibration load of the comparative example is shown in fig. 7.
As can be seen from fig. 4 to 7, the particle-filled sleepers of different recycled aggregate grades and different recycled aggregate and rubber particle combinations have better vibration reduction effect. Comparing fig. 4 and 5, when the grade of the recycled aggregate is higher, the vibration reduction effect of the sleeper is better. Comparing fig. 4 and 6, when the proportion of the rubber particles in the filled mixed particles is larger, the vibration damping effect of the sleeper is better.
In conclusion, the recycled aggregate and rubber particle filled vibration damping sleeper disclosed by the invention not only can effectively reduce vibration caused by train running, but also can utilize recycled materials, and meanwhile, the recycled aggregate and rubber particle filled vibration damping sleeper has the advantages of low production cost, good stress performance, high construction speed, environmental friendliness, environment friendliness and the like. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The damping sleeper filled with the recycled aggregate and the rubber particles is characterized by comprising a steel fiber concrete sleeper body (1), a cavity arranged in the steel fiber concrete sleeper body (1), a steel wire cage (2) attached to the inner wall of the cavity, and a recycled aggregate/rubber filler (3) filled in the steel wire cage (2);
the recycled aggregate/rubber filler (3) comprises rubber particles and recycled aggregate particles in a volume ratio of (1-3): 100.
2. The recycled aggregate and rubber particle filled vibration damping sleeper as claimed in claim 1, wherein the steel fiber concrete sleeper body is cast by steel fiber concrete material, and the steel fiber concrete material comprises the following components in parts by weight:
1 part of cement; 2.4-3.6 parts of coarse aggregate; 1.3-2.5 parts of river sand; 0.3-0.4 part of water; 0.05-0.11 part of steel fiber; 0.004 to 0.021 portion of water reducing agent.
3. The recycled aggregate and rubber particle filled vibration damping sleeper as claimed in claim 1, wherein said cement is P.O 42.5.5 grade Portland cement; the fineness modulus of the river sand is 2.4-3.1; the water reducing agent is a polycarboxylic acid water reducing agent with the water reducing rate of 25-50%.
4. The recycled aggregate and rubber particle filled vibration damping sleeper as claimed in claim 1, wherein said steel fibers are corrugated steel fibers or end hook type steel fibers, and have a diameter of 0.2-0.6mm and a length of 10-30 mm.
5. The recycled aggregate and rubber particle filled vibration damping sleeper as claimed in claim 1, wherein the recycled aggregate particles are I-type recycled aggregates or II-type recycled aggregates, and the particle size is 5-25 mm.
6. The recycled aggregate and rubber particle filled vibration damping sleeper as claimed in claim 1, wherein the rubber particles are ethylene propylene diene monomer rubber particles with the particle size of 2-4 mm.
7. The recycled aggregate and rubber particle filled vibration damping sleeper as claimed in claim 1, wherein said wire cage (2) is formed by a plurality of steel wires arranged vertically or in parallel, the diameter of the steel wires is 2-4mm, and the distance between the steel wires is 25-75 mm.
8. The recycled aggregate and rubber particle filled vibration damping sleeper as claimed in claim 1, wherein the wall thickness of said cavity is not less than 60 mm.
9. A method of making a recycled aggregate and rubber particle filled vibration damping sleeper as claimed in any one of claims 1 to 8, wherein the method includes the steps of:
1) pouring, maintaining and forming the sleeper bottom plate, the side walls and the partition to form cavity side walls;
2) mixing the rubber particles with recycled aggregate particles to obtain recycled aggregate/rubber filler; placing a steel wire cage at the position of the cavity, and filling recycled aggregate/rubber filler;
3) and pouring, maintaining and molding the top surface of the sleeper, and obtaining the vibration-damping sleeper.
10. The method for preparing the recycled aggregate and rubber particle filled vibration damping sleeper as claimed in claim 9, wherein in the step 3), before the sleeper top surface is poured, coarse sand is paved on the top surface of the recycled aggregate/rubber filler, and then pouring is carried out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111662722.XA CN114315277B (en) | 2021-12-31 | 2021-12-31 | Recycled aggregate and rubber particle filled vibration-damping sleeper and preparation method thereof |
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| CN202111662722.XA CN114315277B (en) | 2021-12-31 | 2021-12-31 | Recycled aggregate and rubber particle filled vibration-damping sleeper and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2675724Y (en) * | 2003-06-30 | 2005-02-02 | 陈世宗 | Vibration absorbing sleeper |
| JP2009167687A (en) * | 2008-01-16 | 2009-07-30 | Railway Technical Res Inst | Track repair method, and mixing filler and solid body forming material used for the method |
| US20150308051A1 (en) * | 2013-01-14 | 2015-10-29 | Greenrail S.R.L. | Composite railway sleeper |
| CN105332324A (en) * | 2015-11-25 | 2016-02-17 | 中格复合材料（南通）有限公司 | Composite sleeper |
| CN207419165U (en) * | 2017-08-03 | 2018-05-29 | 华东交通大学 | A kind of particle damping energy dissipation vibration damping railway ballast pad |
| CN108589436A (en) * | 2018-05-31 | 2018-09-28 | 中国铁道科学研究院铁道建筑研究所 | A kind of fiber reinforcement prestressed reinforced concrete sleeper |
-
2021
- 2021-12-31 CN CN202111662722.XA patent/CN114315277B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2675724Y (en) * | 2003-06-30 | 2005-02-02 | 陈世宗 | Vibration absorbing sleeper |
| JP2009167687A (en) * | 2008-01-16 | 2009-07-30 | Railway Technical Res Inst | Track repair method, and mixing filler and solid body forming material used for the method |
| US20150308051A1 (en) * | 2013-01-14 | 2015-10-29 | Greenrail S.R.L. | Composite railway sleeper |
| CN105332324A (en) * | 2015-11-25 | 2016-02-17 | 中格复合材料（南通）有限公司 | Composite sleeper |
| CN207419165U (en) * | 2017-08-03 | 2018-05-29 | 华东交通大学 | A kind of particle damping energy dissipation vibration damping railway ballast pad |
| CN108589436A (en) * | 2018-05-31 | 2018-09-28 | 中国铁道科学研究院铁道建筑研究所 | A kind of fiber reinforcement prestressed reinforced concrete sleeper |
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