CN114956670B - Prefabricated epoxy asphalt elastic ballast bed for transition section of high-speed railway bridge - Google Patents

Prefabricated epoxy asphalt elastic ballast bed for transition section of high-speed railway bridge Download PDF

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CN114956670B
CN114956670B CN202210522925.7A CN202210522925A CN114956670B CN 114956670 B CN114956670 B CN 114956670B CN 202210522925 A CN202210522925 A CN 202210522925A CN 114956670 B CN114956670 B CN 114956670B
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epoxy asphalt
prefabricated
asphalt
track bed
parts
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CN114956670A (en
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杨军
石晨光
黄卫
吴忧
周彦冰
王厚植
易星宇
王添令
于运红
陈辉民
李足远
黄鹏
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Southeast University
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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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/02—Piers; Abutments ; Protecting same against drifting ice
    • 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
    • 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)
  • Structural Engineering (AREA)
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Abstract

The invention relates to the technical field of high-speed railway ballast beds, relates to a prefabricated epoxy asphalt elastic ballast bed for a transition section of a high-speed railway bridge and a design method of a mixture of the prefabricated epoxy asphalt elastic ballast bed, and in particular relates to a prefabricated epoxy asphalt elastic ballast bed for a transition section of a high-speed railway bridge. The transition section of the high-speed railway bridge is divided into a concrete bridge stage section, a soil roadbed section and an intermediate section between the concrete bridge stage section and the soil roadbed section; the prefabricated epoxy asphalt elastic track bed is prepared from mineral aggregate, waste rubber particles, polymer modified asphalt and an epoxy resin/curing agent system; the high-strength prefabricated epoxy asphalt elastic track bed is arranged on a concrete bridge stage section, the low-front-degree prefabricated epoxy asphalt elastic track bed is arranged on an earth roadbed section, and the medium-strength prefabricated epoxy asphalt elastic track bed is arranged on a middle section. The prefabricated sleeper-epoxy asphalt curing track bed unit structure can realize flexible design of the transition section length and asphalt track bed structure combination with different intensities.

Description

Prefabricated epoxy asphalt elastic ballast bed for transition section of high-speed railway bridge
Technical Field
The invention relates to the technical field of high-speed railway ballast beds, relates to a prefabricated epoxy asphalt elastic ballast bed for a transition section of a high-speed railway bridge and a design method of a mixture of the prefabricated epoxy asphalt elastic ballast bed, and in particular relates to a prefabricated epoxy asphalt elastic ballast bed for a transition section of a high-speed railway bridge.
Background
The bridge structure occupies a larger proportion in the high-speed railway route, so that more roadbed-bridge transition sections exist. Because the mechanical properties of the roadbed material and the materials used for pouring the bridge abutment structure have larger differences, the rigidity between the roadbed and the bridge abutment structure is generally different, so that the track structures on different bases show larger rigidity differences, which causes the problem of irregularity of the bridge transition section. The track irregularity causes the vehicle to jump at the transition section, which in turn causes large acceleration and vibration load, which have serious effects on the running safety of the high-speed train, the loss of the vehicle, the performance of the track structural components and the comfort of passengers.
The transition section is arranged to reduce the rigidity difference between the roadbed and the bridge structure, the larger rigidity difference is divided into a plurality of small rigidity differences, and the gradual transition of the rigidity of the track structure in a certain range is realized. The prior transition section has the following treatment measures for the track structure part: setting an auxiliary rail; adjusting the width, length and spacing of the sleeper; different ballast bed rigidities are set. Changing the track stiffness can change the thickness of the track bed and its own stiffness. The increased thickness can effectively improve the rigidity of the track and is often used for transition sections of ballasted tracks and ballastless tracks. Another way to increase the rigidity of the ballast bed is to change the bonding mode in the ballast bed, for example, the strength of the ballast bed can be improved by adopting ballast glue, so that the granular ballast bed forms a complete ballast bed body with stability. Polyurethane materials are common railway ballast consolidation materials which have been widely used in chinese railway routes. Chinese patent CN207314043U discloses a polyurethane cured ballast bed, which is prefabricated in a factory, and effectively solves the severe construction requirements of polyurethane on temperature, humidity, ballast cleanliness and the like. However, the method is not easy to accurately design polyurethane ballast beds with different rigidities for road and bridge transition sections.
Disclosure of Invention
The invention provides a prefabricated epoxy asphalt elastic track bed for a transition section of a high-speed railway bridge, which realizes gradual transition of rigidity of asphalt mixture by replacing aggregate with the smallest particle size forming a mixture skeleton structure with rubber particles with the same particle size. Meanwhile, the asphalt mixture doped with rubber particles can provide an effective vibration reduction effect for the track structure, and the smooth and comfortable running of the transition section train can be realized.
The invention adopts the following technical scheme:
the invention relates to a prefabricated epoxy asphalt elastic track bed for a transition section of a high-speed railway bridge, which is divided into a concrete bridge stage section, a soil roadbed section and a middle section between the concrete bridge stage section and the soil roadbed section; the prefabricated epoxy asphalt elastic track bed is prepared from mineral aggregate, waste rubber particles, polymer modified asphalt and an epoxy resin/curing agent system;
the prefabricated epoxy asphalt elastic ballast bed comprises the following components in parts by mass:
Figure GDA0003842535400000021
forming a high-strength prefabricated epoxy asphalt elastic track bed, a medium-strength prefabricated epoxy asphalt elastic track bed and a low-strength prefabricated epoxy asphalt elastic track bed through parameters of the components;
the high-strength prefabricated epoxy asphalt elastic track bed is arranged on the concrete bridge stage section, the low-strength prefabricated epoxy asphalt elastic track bed is arranged on the soil roadbed section, and the medium-strength prefabricated epoxy asphalt elastic track bed is arranged on the middle section.
The invention relates to a prefabricated epoxy asphalt elastic track bed for a transition section of a high-speed railway bridge, which comprises the following components:
Figure GDA0003842535400000022
the medium-strength prefabricated epoxy asphalt elastic track bed comprises the following components:
Figure GDA0003842535400000023
the low-strength prefabricated epoxy asphalt elastic track bed comprises the following components:
Figure GDA0003842535400000024
Figure GDA0003842535400000031
the invention relates to a prefabricated epoxy asphalt elastic track bed for a transition section of a high-speed railway bridge, which comprises two prefabricated epoxy asphalt track bed curing blocks and sleeper; grooves with depth of 10cm are reserved at the tops of the two prefabricated epoxy asphalt track bed curing blocks and are used for pre-burying sleeper.
The prefabricated epoxy asphalt elastic track bed for the transition section of the high-speed railway bridge has the advantages that mineral aggregates with the particle size of less than 31.5mm in the prefabricated epoxy asphalt elastic track bed are maximum particle sizes, the mineral aggregates with the particle size of more than or equal to 4.75mm are coarse aggregates, and the mineral aggregates with the particle size of less than 4.75mm are fine aggregates.
The prefabricated epoxy asphalt elastic track bed for the transition section of the high-speed railway bridge comprises a framework structure formed by waste rubber particles in the prefabricated epoxy asphalt elastic track bed; waste rubber particles with the particle size of 4.75mm replace coarse aggregate particles with the particle size of 4.75 mm.
The prefabricated epoxy asphalt elastic ballast bed for the transition section of the high-speed railway bridge has the unit blocks of 105cm in length and 105cm in width: 50cm, height: 35cm.
Advantageous effects
The prefabricated epoxy asphalt elastic track bed for the transition section of the high-speed railway bridge provided by the invention has the advantages that the prefabricated sleeper-epoxy asphalt curing track bed unit structure can realize flexible design of the combination of the transition section length and asphalt track bed structures with different intensities.
The prefabricated epoxy asphalt elastic track bed for the transition section of the high-speed railway bridge can realize gradient of the rigidity of the asphalt track bed through the grading design of the asphalt mixture, and design and performance optimization of the epoxy asphalt mixture with different rubber particle doping amounts are carried out according to the environmental characteristics of practical engineering application, so that the stable transition of the rigidity of the transition section of the road bridge is realized.
The prefabricated epoxy asphalt elastic track bed for the transition section of the high-speed railway bridge provided by the invention has the advantages that the asphalt cement is used as a viscoelastic material, the waste rubber particles are used as an elastic material, and the two materials are added into the track structure track bed, so that the damping characteristic of the track bed is effectively increased, and the effects of vibration reduction and noise reduction are achieved.
The prefabricated epoxy asphalt elastic track bed for the transition section of the high-speed railway bridge provided by the invention has the advantages that the prefabricated sleeper-epoxy asphalt curing track bed unit structure realizes high-quality preparation in factories and rapid assembly in construction sites, the construction period is greatly shortened, and the engineering quality is improved.
Drawings
FIG. 1 is a block unit structure of a prefabricated sleeper-epoxy asphalt curing;
FIG. 2 is a schematic illustration of the laying of beds of different stiffness in longitudinal section of a road bridge transition section;
FIG. 3 is a main plot of dynamic modulus and phase angle for an epoxy asphalt mixture (a) with a rubber particle loading of 0; (b) a storage modulus and loss modulus main curve;
FIG. 4 is a main plot of dynamic modulus and phase angle for an epoxy asphalt mixture (a) having a rubber particle loading of 2; (b) a storage modulus and loss modulus main curve;
FIG. 5 is a main plot of dynamic modulus and phase angle for an epoxy asphalt mixture (a) having a rubber particle loading of 4; (b) a storage modulus and loss modulus main curve;
FIG. 6 is a main plot of dynamic modulus and phase angle for an epoxy asphalt mixture (a) with a rubber particle loading of 6; (b) a storage modulus and loss modulus main curve;
FIG. 7 is a graph showing the damping main curves of four epoxy asphalt mixtures with different rubber particle loadings.
Wherein 1 is sleeper, 2 is prefabricated epoxy asphalt solidified block, 3 is rubble railway ballast, 4 is road bed, and 5 is abutment.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
As shown in fig. 1 or fig. 2: the invention provides a prefabricated epoxy asphalt elastic track bed for a transition section of a high-speed railway bridge, which comprises a sleeper 1, prefabricated epoxy asphalt track bed curing blocks 2 and gravel ballasts 3 used for filling between the curing blocks, wherein the strength of the prefabricated epoxy asphalt track bed curing blocks 2 gradually decreases along with the increase of the mass percentage of doped rubber particles. The prefabricated epoxy asphalt elastic track bed unit structure comprises a concrete sleeper 1 and two prefabricated epoxy asphalt curing blocks 2 which are formed by rolling, wherein epoxy asphalt mortar is adopted between the sleeper 1 and the prefabricated epoxy asphalt curing blocks 2 for bonding, so that a sleeper-epoxy asphalt curing block unit structure is formed.
The sleeper 1 and the prefabricated epoxy asphalt track bed curing block 2 are factory prefabricated parts. The prefabricated epoxy asphalt ballast bed solidified block 2 is formed by mixing, curing and rolling asphalt mixture, and asphalt concrete with certain strength is formed after curing for 4 days in an environment of 60 ℃. The size of the asphalt curing track bed unit blocks is 105cm (length) by 50cm (width) by 35cm (thickness), and grooves with the depth of 10cm are reserved for embedding the cement concrete sleeper, namely the stressed thickness under the sleeper is 25cm during rolling and forming. In order to bond the sleeper and the asphalt solidified block, the epoxy asphalt mortar with better fluidity (the aggregate grain diameter is less than or equal to 2.36 mm) is designed by adopting the maximum density theory. Epoxy asphalt mortar is used on the one hand to provide the bond strength of the sleeper-asphalt cured block interface, and is used to fill the larger gaps between the sleeper and the asphalt cured block. After curing for a certain period of time, the prefabricated sleeper-epoxy asphalt curing block unit structure shown in figure 1 can be formed.
Assembling prefabricated sleeper-epoxy asphalt curing block unit structures with different intensities on a construction site, paving an asphalt track bed with the maximum intensity in the direction of an abutment 5, and gradually reducing the intensity of the asphalt track bed paved along the direction 4 of the roadbed. The distance between sleeper is 60cm, so that 10cm gaps are reserved among sleeper-epoxy asphalt curing block unit structures, and the sleeper-epoxy asphalt curing block unit structures are filled with granular railway ballasts. 13 different prefabricated sleeper-epoxy asphalt curing block unit structures are paved respectively, and four asphalt track beds can meet the requirement of at least 30m of transition sections.
The epoxy asphalt mixture with different rubber particle doping amounts is designed based on a skeleton-filling theory, coarse aggregates with the particle size of more than or equal to 4.75mm are mutually supported to form a skeleton of the asphalt mixture, fine aggregates with the particle size of less than 4.75mm and fillers are filled in gaps (VCA) of the skeleton structure to form a mineral system of the asphalt mixture, and asphalt is further filled in the gaps (VMA) of the mineral mixture to form the whole asphalt mixture structure.
The mixture structure obtained by the design method has good skeleton performance and excellent performance in high-temperature stability, so that the skeleton-filling asphalt mixture structure designed by the method meets the requirement of a track structure on the aspect of accumulation deformation resistance of a track bed material. Meanwhile, the track structure has higher requirements on the deformation performance of the ballast bed, and the characteristics are helpful for reducing the interaction between the wheel tracks, so that the safety and the comfort of the running of the vehicle are ensured.
In order to increase the deformation characteristic of the asphalt mixture, rubber particles with the same particle size are adopted to replace aggregates with the same particle size, the aggregates are the smallest particle size forming a framework structure of the mixture, and the aggregate mass ratio in the framework structure is the highest, and the aggregates are selected as the replacement objects, so that the replacement quality of the rubber particles can be effectively improved.
The design method of the asphalt mixture comprises the following steps:
1. the density of each grade of aggregate, mineral powder, rubber particles and asphalt is tested according to the highway engineering aggregate test procedure (JTG E42-2005) and the highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011);
2. testing the volume filling ratio V of aggregate with maximum grain size in single-grade stacking 0 And calculating the theoretical grading of the coarse aggregate (more than or equal to 4.75 mm) forming the framework structure according to the formula 1. Wherein V is 1 The filling rate of the coarse-level aggregate of the two-level aggregate mixture is shown as D, the particle size of the coarse-level aggregate is shown as D, and the particle size of the fine-level aggregate is shown as D.
Figure GDA0003842535400000061
3. The grading of the fine aggregate and the mineral powder is designed according to the maximum density theory and calculated according to the formula 2.
Figure GDA0003842535400000062
4. The asphalt mixture mix design was calculated according to formulas 3-5.
G+g＝100％ (3)
Figure GDA0003842535400000063
Figure GDA0003842535400000064
Wherein: g is the proportion of coarse aggregate (more than or equal to 4.75 mm) in the mineral mixture,%; g is fine aggregate in mineral mixture<4.75 mm) and filler,%; ρ g G/cm, the density of aggregate and filler after mixing 3 ；ρ s Is the compact bulk density of coarse aggregate, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the VCA is the void fraction of aggregate in the tightly packed state,%; VMA is the material gap rate,%; p (P) a And ρ a The asphalt-stone ratio and asphalt density of the asphalt mixture are respectively; VV is the void fraction of the asphalt mixture,%.
5. According to the performance requirement, determining VMA and VV values according to the specification, substituting the VMA and VV values into the formula, and obtaining the mixing ratio of the asphalt mixture.
According to the calculation result, the mass percentage of the aggregate with the minimum particle size forming the framework structure is known, the mass percentage range of the replaceable rubber particles is determined, and the blending amount of different rubber particles represents the epoxy asphalt track bed unit structure with different rigidities.
The strength of the epoxy asphalt mixture can be reduced along with the increase of the mixing amount of the rubber particles, so that the gradient change of the strength of an asphalt track bed is realized.
The prefabricated sleeper-prefabricated epoxy asphalt curing block unit structure with the maximum strength is paved at one end of a cement concrete bridge platform, and the strength of an asphalt track bed gradually decreases along the direction from the bridge to the road, so that the smooth transition of the rigidity of the transition section of the road and the bridge is realized.
The invention designs the rubber-particle-doped epoxy asphalt mixture with different intensities according to the skeleton-filling theory. The particle size range of the ballasts used for the high-speed railway ballasted track 3 is 22.4-63mm, and the ballast bed with coarse aggregate as a main component transmits vehicle load through the embedding and extrusion action among the ballasts. In order to realize the mixing and forming operability of the mixture used for the epoxy asphalt curing test piece, the research considers that aggregate with the maximum particle size of 31.5mm is adopted for asphalt mixture grading design, and the particle size is consistent with the research of the existing most asphalt beds. The epoxy asphalt mix used in this study was graded as shown in Table 1, calculated according to formulas 1-5.
TABLE 1 theoretical grading calculation Table
Figure GDA0003842535400000071
From the above table, the aggregate with the grain size of 4.75mm accounts for the largest proportion in the framework structure, and provides more contact points in the framework structure, which ensures the stability of the whole framework structure and the load transmission path. In order to increase the deformation characteristics and the deformation recovery capability of the skeleton structure, aggregates with equal particle diameters are replaced by equal volumes of 2%, 4% and 6% of rubber particles (mass percentage of raw mineral mixture). The elastic rubber particles play the role of countless miniature springs in a framework structure formed by rigid aggregate, and provide driving force for deformation and deformation recovery of the asphalt ballast bed.
Based on the above theory and data, it was determined by Marshall's test that the optimum whetstone ratio of the four different rubber particle blends (0 CR, 2CR, 4CR and 6 CR) were 4.1%,4.3%,4.8% and 5.3%, respectively.
Fig. 3 to 6 show the dynamic modulus (a), the phase angle main curve and the storage modulus and loss modulus main curve of the four asphalt mixtures, respectively, and as the test results, the modulus of the asphalt mixture gradually decreases and the damping coefficient (fig. 7) gradually increases as the blending amount of the rubber particles increases. The test result proves that the rigidity of the epoxy asphalt mixture designed in the invention shows a gradually and gradually decreasing trend, and can be effectively applied to road and bridge transition sections.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (5)

1. A prefabricated epoxy asphalt elasticity railway roadbed for high-speed railway bridge changeover portion, its characterized in that: the transition section of the high-speed railway bridge is divided into a concrete bridge stage section, a soil roadbed section and an intermediate section between the concrete bridge stage section and the soil roadbed section; the prefabricated epoxy asphalt elastic track bed is prepared from mineral aggregate, waste rubber particles, polymer modified asphalt and an epoxy resin/curing agent system;
the prefabricated epoxy asphalt elastic ballast bed comprises the following components in parts by mass:
94-100 parts of mineral aggregate;
0-6 parts of waste rubber particles;
2-3 parts of polymer modified asphalt;
2-3 parts of an epoxy resin/curing agent system;
forming a high-strength prefabricated epoxy asphalt elastic track bed, a medium-strength prefabricated epoxy asphalt elastic track bed and a low-strength prefabricated epoxy asphalt elastic track bed through parameters of the components;
the high-strength prefabricated epoxy asphalt elastic track bed is arranged on the concrete bridge stage section, the low-strength prefabricated epoxy asphalt elastic track bed is arranged on the soil roadbed section, and the medium-strength prefabricated epoxy asphalt elastic track bed is arranged on the middle section;
the high-strength prefabricated epoxy asphalt elastic ballast bed comprises the following components:
100 parts of mineral aggregate;
0 part of waste rubber particles;
2-3 parts of polymer modified asphalt;
2-3 parts of an epoxy resin/curing agent system;
the medium-strength prefabricated epoxy asphalt elastic track bed comprises the following components:
98 parts of mineral aggregate;
2 parts of waste rubber particles;
2-3 parts of polymer modified asphalt;
2-3 parts of an epoxy resin/curing agent system;
the low-strength prefabricated epoxy asphalt elastic track bed comprises the following components:
96-94 parts of mineral aggregate;
4-6 parts of waste rubber particles;
2-3 parts of polymer modified asphalt;
2-3 parts of epoxy resin/curing agent system.
2. The prefabricated epoxy asphalt elastomeric ballast bed for a high-speed railway bridge transition segment of claim 1, wherein: the prefabricated epoxy asphalt elastic track bed comprises two prefabricated epoxy asphalt track bed curing blocks and sleeper; grooves with the depth of 10cm are reserved at the tops of the two prefabricated epoxy asphalt track bed curing blocks and are used for pre-burying sleeper.
3. The prefabricated epoxy asphalt elastomeric ballast bed for a high-speed railway bridge transition segment of claim 1, wherein: the mineral aggregate with the grain diameter of more than or equal to 4.75mm is coarse aggregate, and the mineral aggregate with the grain diameter of less than 4.75mm is fine aggregate, wherein the grain diameter of the mineral aggregate in the prefabricated epoxy asphalt elastic track bed is smaller than 31.5 and mm.
4. A prefabricated epoxy asphalt elastomeric ballast bed for a high-speed railway bridge transition segment according to claim 1 or 3, wherein: the waste rubber particles form a skeleton structure in the prefabricated epoxy asphalt elastic ballast bed; waste rubber particles with the particle size of 4.75mm replace coarse aggregate particles with the particle size of 4.75 mm.
5. The prefabricated epoxy asphalt elastomeric ballast bed for a high-speed railway bridge transition segment of claim 2, wherein: the length of the prefabricated epoxy asphalt ballast bed curing block is 105cm, and the width is: 50cm, height is: 35cm.
CN202210522925.7A 2022-05-13 2022-05-13 Prefabricated epoxy asphalt elastic ballast bed for transition section of high-speed railway bridge Active CN114956670B (en)

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