Roadbed filler and its preparation method

Abstract

This invention provides a roadbed filler and its preparation method. The roadbed filler includes filler A and filler B; filler A comprises cement, coal-based solid waste, water, and a water-reducing agent; filler B comprises crushed rubber waste particles, sepiolite, bisphenol A glycidyl ether dimethacrylate, and a dispersant; based on the total mass of filler A as 100%, the mass content of filler B is 16.5%–23.5%. The roadbed filler of this invention has advantages such as high fluidity, lightweight, no need for compaction or vibration, high compressive strength, low cost, and wide availability of materials. Furthermore, the roadbed filler of this invention not only reduces the self-weight of the embankment and the additional stress on the foundation but also improves the compaction quality of the roadbed filler, making it particularly suitable for engineering construction such as bridge and culvert abutment backfilling.

Description

Technical Field

[0001] This invention relates to the field of roadbed filler technology, and more specifically, to a roadbed filler and its preparation method. Background Technology

[0002] Coal-based solid waste mainly includes tailings, coal gangue, fly ash, smelting slag, industrial by-product gypsum, red mud, and carbide slag. The accumulation of these coal-based solid wastes not only occupies a large amount of land, but also causes environmental problems such as dust pollution of the air and toxic elements seeping into the groundwater and polluting it.

[0003] Based on its physical and mechanical properties, coal gangue is suitable for use in roadbed engineering. Its non-toxicity and strength meet aggregate specifications, and it can replace traditional roadbed fillers. However, coal gangue has a wide gradation range and is often poorly graded. It also frequently contains local soil types, which significantly affects the compaction characteristics of coal gangue roadbeds.

[0004] Tailings sand is non-toxic and has a certain strength, but its strength cannot meet the technical requirements for use as aggregate, and its stability is poor and it is not easy to compact. Therefore, tailings sand cannot be used alone for roadbed filling.

[0005] Fly ash is widely used due to its chemical activity. Its internal active substances, SiO2 and Al2O3, can generate cementitious substances through a pozzolanic reaction in an alkaline environment. Therefore, the resource utilization of coal-based solid wastes such as fly ash has become a focus.

[0006] During highway construction, high embankment sections in soft soil areas, reconstruction and expansion sections, and bridge and culvert abutment backfill sections are frequently encountered. These sections have significant additional stress on the foundation, and the roadbed construction surface is narrow and compaction is difficult, which can easily lead to uneven settlement of the roadbed after construction, causing engineering quality problems such as bridge approach slab settlement. Summary of the Invention

[0007] The main objective of this invention is to provide a roadbed filler and its preparation method to solve the problems in the prior art, such as the large self-weight of the embankment and the additional stress of the foundation in some sections of highway construction, and the poor compaction quality caused by the small working surface during construction.

[0008] To achieve the above objectives, according to one aspect of the present invention, a roadbed filler is provided, comprising filler A and filler B; wherein filler A comprises cement, coal-based solid waste, water, and a water-reducing agent; filler B comprises rubber waste pulverized particles, sepiolite, bisphenol A glycidyl ether dimethacrylate, and a dispersant; and the mass content of filler B is 16.5% to 23.5% based on the total mass of filler A as 100%.

[0009] Furthermore, in filler B, the mass content of crushed rubber waste particles is 11-15%, and / or the mass content of sepiolite is 1-2%, and / or the mass content of bisphenol A glycidyl ether dimethacrylate is 0.5-1.5%, and / or the mass content of dispersant is 4-5%.

[0010] Furthermore, the mass ratio of sepiolite to bisphenol A glycidyl ether dimethacrylate is 1 to 4:1.

[0011] Furthermore, in filler A, the coal-based solid waste is fly ash, and / or the fly ash is grade III fly ash, and / or the mass ratio of cement to fly ash is 8-12:88-92.

[0012] Furthermore, based on the total mass of cement and coal-based solid waste as 100%, the water content is 65-75% by mass, and / or the water-reducing agent content is 1.5-2.5% by mass.

[0013] Furthermore, the cement is Psa32.5 cement, and / or the water-reducing agent is polycarboxylate water-reducing agent, and / or the average particle size of the crushed rubber waste particles is 1-2 mm, and / or the dispersant is polyethylene glycol.

[0014] Furthermore, the density of the aforementioned roadbed fill material is 1200–1400 kg / m³. 3 .

[0015] According to another aspect of the present invention, a method for preparing the above-mentioned roadbed filler is provided, the method comprising: step S1, mixing cement, coal-based solid waste, water and water-reducing agent in a first mixing to obtain filler A; step S2, mixing sepiolite, dispersant, rubber waste pulverized particles and bisphenol A glycidyl ether dimethacrylate in a second mixing to obtain filler B; and step S3, mixing filler A and filler B in a third mixing to obtain roadbed filler.

[0016] Further, step S2 includes: step S21, dividing the rubber waste pulverized particles into two parts to obtain first pulverized particles and second pulverized particles; step S22, first stirring sepiolite and dispersant to obtain a first mixture; step S23, second stirring the first mixture and the first pulverized particles to obtain a second mixture; step S24, third stirring the second mixture, the second pulverized particles and bisphenol A glycidyl ether dimethacrylate to obtain filler B.

[0017] Furthermore, the mass ratio of the first pulverized particle to the second pulverized particle is 3 to 6:1.

[0018] By applying the technical solution of this invention, this application adds sepiolite, bisphenol A glycidyl ether dimethacrylate, and dispersants to the existing rubber waste, ensuring the compressive strength of the roadbed filler while avoiding excessive bleeding. Existing roadbed fillers directly add small-particle-size (approximately 60-150 mesh) rubber waste in small quantities (≤10%). However, compared to large-particle-size rubber waste, the compressive strength of small-particle-size rubber is reduced, and excessive addition leads to increased bleeding. The bisphenol A glycidyl ether dimethacrylate and sepiolite added in this invention have a synergistic effect, allowing for good compounding with filler A even with large amounts of large-particle-size rubber waste, thus obtaining a standard roadbed filler that meets engineering requirements. This invention relates to a lightweight filler A made by mixing fly ash, a water-reducing agent, cement, and water. The cement hydration creates an alkaline environment, which activates the fly ash and facilitates a pozzolanic reaction between the fly ash and cement to generate cementitious substances, thus ensuring the strength of filler A. The use of the water-reducing agent not only significantly reduces the amount of water required for mixing filler A but also greatly improves the early strength of the subgrade filler. The subgrade filler of this invention has advantages such as high fluidity, lightweight, no need for compaction or vibration, high compressive strength, low cost, and wide availability of materials. Furthermore, the subgrade filler of this invention not only reduces the self-weight of the embankment and the additional stress on the foundation but also improves the compaction quality of the subgrade filler, making it particularly suitable for engineering construction such as bridge and culvert abutment backfilling.

[0019] Specific implementation methods

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the embodiments.

[0021] As analyzed in the background section of this application, in the prior art, some sections of highway construction suffer from problems such as large embankment self-weight and additional stress on the foundation, and small working area leading to poor compaction quality. In order to solve the above problems, this application provides a roadbed filler and its preparation method.

[0022] In a typical embodiment of this application, a roadbed filler is provided, comprising filler A and filler B; wherein filler A comprises cement, coal-based solid waste, water, and a water-reducing agent; filler B comprises rubber waste pulverized particles, sepiolite, bisphenol A glycidyl ether dimethacrylate, and a dispersant; and the mass content of filler B is 16.5% to 23.5% based on the total mass of filler A as 100%.

[0023] This application, based on existing rubber waste materials, adds sepiolite, bisphenol A glycidyl ether dimethacrylate, and dispersants, ensuring the compressive strength of the roadbed filler while preventing excessive bleeding. Existing roadbed fillers directly add small-particle-size (approximately 60-150 mesh) rubber waste in small quantities (≤10%). However, compared to large-particle rubber waste, the compressive strength of small-particle rubber is reduced, and excessive addition leads to increased bleeding. The bisphenol A glycidyl ether dimethacrylate and sepiolite added in this invention have a synergistic effect, allowing for good compounding with filler A even with large amounts of large-particle rubber waste, thus obtaining a standard roadbed filler that meets engineering requirements. This invention relates to a lightweight filler A made by mixing fly ash, a water-reducing agent, cement, and water. The cement hydration creates an alkaline environment, which activates the fly ash and facilitates a pozzolanic reaction between the fly ash and cement to generate cementitious substances, thus ensuring the strength of filler A. The use of the water-reducing agent not only significantly reduces the amount of water required for mixing filler A but also greatly improves the early strength of the subgrade filler. The subgrade filler of this invention has advantages such as high fluidity, lightweight, no need for compaction or vibration, high compressive strength, low cost, and wide availability of materials. Furthermore, the subgrade filler of this invention not only reduces the self-weight of the embankment and the additional stress on the foundation but also improves the compaction quality of the subgrade filler, making it particularly suitable for engineering construction such as bridge and culvert abutment backfilling.

[0024] In one embodiment of this application, the filler B contains 11-15% by mass of crushed rubber waste particles, 1-2% by mass of sepiolite, 0.5-1.5% by mass of bisphenol A glycidyl ether dimethacrylate, and 4-5% by mass of dispersant.

[0025] Controlling the mass content of rubber waste pulverized particles, sepiolite, bisphenol A glycidyl ether dimethacrylate, and dispersant in filler B within the above range helps to improve the synergistic effect of bisphenol A glycidyl ether dimethacrylate and sepiolite. Even with the addition of a large amount of large-diameter rubber waste pulverized particles to filler B, it can still be well compounded with filler A, thus obtaining standard roadbed filler that meets engineering requirements. The dispersant helps to promote uniform mixing of the components, thereby enhancing the compressive strength and deformation resistance of the roadbed filler.

[0026] In one embodiment of this application, the mass ratio of sepiolite to bisphenol A glycidyl ether dimethacrylate is 1 to 4:1.

[0027] Controlling the mass ratio of sepiolite and bisphenol A glycidyl ether dimethacrylate within the above range helps to further enhance the synergistic effect of bisphenol A glycidyl ether dimethacrylate and sepiolite, and further improve the compounding effect of rubber waste crushed particles and filler A.

[0028] In one embodiment of this application, in filler A, the coal-based solid waste is fly ash, and / or the fly ash is grade III fly ash, and / or the mass ratio of cement to fly ash is 8-12:88-92.

[0029] The preferred coal-based solid waste in filler A is fly ash, and the mass ratio of cement to fly ash is controlled within the above range. This helps fly ash and cement to undergo pozzolanic reaction to generate cementitious substances, thereby ensuring the strength of filler A.

[0030] In one embodiment of this application, the water content is 65-75% based on the total mass of cement and coal-based solid waste (100%), and / or the water-reducing agent content is 1.5-2.5%.

[0031] Controlling the mass content of water and water-reducing agent within the above ranges helps reduce the amount of water required for mixing filler A and also helps improve the early strength of the subgrade filler.

[0032] In one embodiment of this application, the cement is Psa32.5 cement, and / or the water-reducing agent is polycarboxylate water-reducing agent, and / or the average particle size of the crushed rubber waste particles is 1-2 mm, and / or the dispersant is polyethylene glycol, and the density of the roadbed filler is 1200-1400 kg / m³. 3 .

[0033] The preferred cement type falls within the above-mentioned range, which helps the cement hydration form an alkaline environment and activate the fly ash, thereby facilitating the pozzolanic reaction between fly ash and cement to generate cementitious substances, thus ensuring the strength of filler A. The preferred polycarboxylate superplasticizer helps further reduce the amount of water required for mixing filler A. Controlling the average particle size of the crushed rubber waste particles within the above-mentioned range helps to balance the compressive strength of the roadbed filler and its compounding effect with filler A. The preferred dispersant is polyethylene glycol, which helps to promote uniform mixing of the components, thereby enhancing the compressive strength and deformation resistance of the roadbed filler. The density of the roadbed filler of this invention reaches the above-mentioned range, which helps to improve the overall stability and bearing capacity of the roadbed.

[0034] In another typical embodiment of this application, a method for preparing the above-mentioned roadbed filler is provided. The method includes: step S1, mixing cement, coal-based solid waste, water and water-reducing agent to obtain filler A; step S2, mixing sepiolite, dispersant, rubber waste pulverized particles and bisphenol A glycidyl ether dimethacrylate to obtain filler B; and step S3, mixing filler A and filler B to obtain roadbed filler.

[0035] This application obtains a lightweight filler A by mixing fly ash, water-reducing agent, cement, and water. The cement hydration creates an alkaline environment, which activates the fly ash and facilitates the pozzolanic reaction between fly ash and cement to generate cementitious substances, thus ensuring the strength of filler A. Based on existing rubber waste, sepiolite, bisphenol A glycidyl ether dimethacrylate, and dispersants are added to obtain filler B. This filler B ensures the compressive strength of the roadbed filler while avoiding excessive bleeding. The bisphenol A glycidyl ether dimethacrylate and sepiolite added to filler B have a synergistic effect. Even with the addition of large-particle-size rubber waste, they can be well mixed with filler A to obtain a standard roadbed filler that meets engineering requirements. Furthermore, the initial mixing further promotes thorough mixing and synergistic effects among the components of filler A, resulting in a uniformly mixed filler A. The second mixing process further facilitates the thorough mixing and synergistic effect of the components in filler B, resulting in a uniformly mixed filler B. This allows filler A and filler B to undergo more uniform physicochemical reactions after mixing, yielding a roadbed filler with excellent comprehensive performance. In addition, the above preparation method is simple and has a low cost.

[0036] In one embodiment of this application, step S2 includes: step S21, dividing the rubber waste pulverized particles into two parts to obtain first pulverized particles and second pulverized particles; step S22, performing a first stirring of sepiolite and dispersant to obtain a first mixture; step S23, performing a second stirring of the first mixture and the first pulverized particles to obtain a second mixture; and step S24, performing a third stirring of the second mixture, the second pulverized particles, and the bisphenol A glycidyl ether dimethacrylate to obtain filler B.

[0037] This application involves adding rubber waste pulverized particles in two separate parts: first pulverized particles and second pulverized particles. The first pulverized particles are then mixed with sepiolite and a dispersant to form a first mixture, resulting in a second mixture. The second pulverized particles, bisphenol A glycidyl ether dimethacrylate, and bisphenol A glycidyl ether dimethacrylate are then mixed evenly to obtain filler B. This process helps to increase the amount of rubber waste pulverized particles added, alleviates the problem of increased water bleeding rate of roadbed fillers, and allows for more thorough compounding with filler A.

[0038] In one embodiment of this application, the mass ratio of the first pulverized particle to the second pulverized particle is 3 to 6:1.

[0039] Controlling the mass ratio of the first and second crushed particles within the above range helps to increase the amount of rubber waste crushed particles added during the second and third mixing processes, as well as to improve the synergistic effect of the rubber waste crushed particles and components such as bisphenol A glycidyl ether dimethacrylate in the filler B system. This alleviates the problem of increased water bleeding rate of the roadbed filler and yields a roadbed filler with higher strength.

[0040] The beneficial effects of this application will be further illustrated below with reference to the embodiments.

[0041] Example 1

[0042] Psa32.5 cement, fly ash, water, and polycarboxylate superplasticizer were mixed to obtain filler A. The mass ratio of cement to fly ash was 8:92. The water content was 66% based on the total mass of cement and fly ash (100%). The superplasticizer content was 1.8%. The fly ash was grade III fly ash, which meets the composite requirements of Huaxin Power Plant. The polycarboxylate superplasticizer was manufactured by Shandong Yuncheng Huihuang New Building Materials Technology Co., Ltd.

[0043] The average particle size of the crushed rubber waste particles is 1 mm. The crushed rubber waste particles are divided into two parts to obtain the first crushed particles and the second crushed particles, with a mass ratio of 4:1. After the sepiolite and polyethylene glycol are mixed evenly in the first stirring, a first mixture is obtained. The first mixture and the first crushed particles are stirred in the second stirring to obtain the second mixture. The second mixture, the second crushed particles, and bisphenol A glycidyl ether dimethacrylate are stirred evenly in the third stirring to obtain filler B. Based on the total mass of filler A as 100%, the filler B contains 11% crushed rubber waste particles, 2% sepiolite, 1.5% bisphenol A glycidyl ether dimethacrylate, and 4% dispersant. The crushed rubber waste particles are obtained by crushing waste automobile rubber tires.

[0044] Filler A and filler B are mixed a third time until they are evenly mixed to obtain the roadbed filler.

[0045] Example 2

[0046] Psa32.5 cement, fly ash, water, and polycarboxylate superplasticizer are mixed in the first step to obtain filler A; wherein, the mass ratio of cement to fly ash is 12:88; the water content is 75% based on the total mass of cement and fly ash as 100%; and the water-reducing agent content is 2.5%.

[0047] The average particle size of the crushed rubber waste particles is 2 mm. The crushed rubber waste particles are divided into two parts with a mass ratio of 5.5:1, resulting in the first and second crushed particles. Sepiol and polyethylene glycol are first stirred and mixed evenly to obtain the first mixture. The first mixture and the first crushed particles are then stirred a second time to obtain the second mixture. The second mixture, the second crushed particles, and bisphenol A glycidyl ether dimethacrylate are then stirred and mixed evenly to obtain filler B. Based on the total mass of filler A as 100%, filler B contains 15% crushed rubber waste particles, 2% sepiolite, 1.5% bisphenol A glycidyl ether dimethacrylate, and 5% dispersant.

[0048] Filler A and filler B are mixed a third time until they are evenly mixed to obtain the roadbed filler.

[0049] Example 3

[0050] Psa32.5 cement, fly ash, water, and polycarboxylate superplasticizer were mixed to obtain filler A; wherein the mass ratio of cement to fly ash was 11:89; the water content was 69% based on the total mass of cement and fly ash (100%); and the superplasticizer content was 2.2%.

[0051] The average particle size of the crushed rubber waste particles is 2 mm. The crushed rubber waste particles are divided into two parts with a mass ratio of 6:1, resulting in the first and second crushed particles. Sepiol and polyethylene glycol are first stirred and mixed evenly to obtain the first mixture. The first mixture and the first crushed particles are then stirred a second time to obtain the second mixture. The second mixture, the second crushed particles, and bisphenol A glycidyl ether dimethacrylate are then stirred and mixed evenly to obtain filler B. Based on the total mass of filler A as 100%, filler B contains 13% crushed rubber waste particles, 2% sepiolite, 1.3% bisphenol A glycidyl ether dimethacrylate, and 4.5% dispersant.

[0052] Filler A and filler B are mixed a third time until they are evenly mixed to obtain the roadbed filler.

[0053] Example 4

[0054] Psa32.5 cement, fly ash, water, and polycarboxylate superplasticizer are mixed in the first step to obtain filler A; wherein, the mass ratio of cement to fly ash is 10:90; the water content is 73% based on the total mass of cement and fly ash as 100%; and the water-reducing agent content is 2.3%.

[0055] The average particle size of the crushed rubber waste particles is 2 mm. The crushed rubber waste particles are divided into two parts with a mass ratio of 4.5:1, resulting in the first and second crushed particles. Sepiol and polyethylene glycol are first stirred and mixed evenly to obtain the first mixture. The first mixture and the first crushed particles are then stirred a second time to obtain the second mixture. The second mixture, the second crushed particles, and bisphenol A glycidyl ether dimethacrylate are then stirred and mixed evenly to obtain filler B. Based on the total mass of filler A as 100%, filler B contains 12% crushed rubber waste particles, 2% sepiolite, 0.5% bisphenol A glycidyl ether dimethacrylate, and 4% dispersant.

[0056] Filler A and filler B are mixed a third time until they are evenly mixed to obtain the roadbed filler.

[0057] Example 5

[0058] The difference from Example 1 is that the mass ratio of sepiolite and bisphenol A glycidyl ether dimethacrylate in filler B is 1:1, resulting in the final roadbed filler.

[0059] Example 6

[0060] The difference from Example 1 is that the mass ratio of sepiolite and bisphenol A glycidyl ether dimethacrylate in filler B is 4:1, resulting in the final roadbed filler.

[0061] Example 7

[0062] The difference from Example 1 is that the mass ratio of sepiolite and bisphenol A glycidyl ether dimethacrylate in filler B is 5:1, resulting in the final roadbed filler.

[0063] Example 8

[0064] The difference from Example 1 is that the mass ratio of the first crushed particles to the second crushed particles is 3:1, and the final roadbed filler is obtained.

[0065] Example 9

[0066] The difference from Example 1 is that the mass ratio of the first crushed particles to the second crushed particles is 6:1, and the final roadbed filler is obtained.

[0067] Example 10

[0068] The difference from Example 1 is that the mass ratio of the first crushed particles to the second crushed particles is 7:1, and the final roadbed filler is obtained.

[0069] Comparative Example 1

[0070] The difference from Example 1 is that sepiolite is not added to filler B, and bisphenol A glycidyl ether dimethacrylate is used to replace sepiolite with an equal mass, and the final roadbed filler is obtained.

[0071] Comparative Example 2

[0072] The difference from Example 1 is that bisphenol A glycidyl ether dimethacrylate is not added to filler B, and bisphenol A glycidyl ether dimethacrylate is replaced with an equal mass of sepiolite, and the final roadbed filler is obtained.

[0073] Comparative Example 3

[0074] The difference from Example 1 is that, with the total mass of filler A as 100%, the mass content of sepiolite in filler B is 4%, and the mass content of bisphenol A glycidyl ether dimethacrylate is 0.3%, thus obtaining the roadbed filler.

[0075] The performance of the roadbed fillers in the embodiments and comparative examples of this invention was tested, and the test results are shown in Table 1.

[0076] Test method:

[0077] Flowability test: The test method is based on the test method in "Application of Liquid Fly Ash in Tangjin Expressway Expansion Project";

[0078] Compressive strength test: The test is conducted according to the "Standard for Test Methods of Basic Performance of Building Mortar";

[0079] Bleeding rate test: The test is conducted in accordance with the "Test Procedures for Cement and Cement Concrete in Highway Engineering" (JTG 3420-2020).

[0080] Compressive resilience modulus test: The test was conducted on the bearing plate test method of the "Test Procedure for Inorganic Binder Stabilized Materials for Highway Engineering" (JTGE51-2009) on roadbed fill specimens that had been cured for 28 days.

[0081] Table 1

[0082]

[0083] As shown in Table 1, the roadbed filler of the present invention exhibits good flowability, high compressive strength, low bleeding rate, and low compressive resilient modulus (increased resistance to elastic deformation and significantly enhanced toughness), making it a standard roadbed filler that meets engineering requirements. Furthermore, the roadbed filler obtained in the above embodiments of the present invention has a density of 1200–1400 kg / m³. 3 .

[0084] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0085] This application, based on existing rubber waste materials, adds sepiolite, bisphenol A glycidyl ether dimethacrylate, and dispersants, ensuring the compressive strength of the roadbed filler while preventing excessive bleeding. Existing roadbed fillers directly add small-particle-size (approximately 60-150 mesh) rubber waste in small quantities (≤10%). However, compared to large-particle rubber waste, the compressive strength of small-particle rubber is reduced, and excessive addition leads to increased bleeding. The bisphenol A glycidyl ether dimethacrylate and sepiolite added in this invention have a synergistic effect, allowing for good compounding with filler A even with large amounts of large-particle rubber waste, thus obtaining a standard roadbed filler that meets engineering requirements. This invention relates to a lightweight filler A made by mixing fly ash, a water-reducing agent, cement, and water. The cement hydration creates an alkaline environment, which activates the fly ash and facilitates a pozzolanic reaction between the fly ash and cement to generate cementitious substances, thus ensuring the strength of filler A. The use of the water-reducing agent not only significantly reduces the amount of water required for mixing filler A but also greatly improves the early strength of the subgrade filler. The subgrade filler of this invention has advantages such as high fluidity, lightweight, no need for compaction or vibration, high compressive strength, low cost, and wide availability of materials. Furthermore, the subgrade filler of this invention not only reduces the self-weight of the embankment and the additional stress on the foundation but also improves the compaction quality of the subgrade filler, making it particularly suitable for engineering construction such as bridge and culvert abutment backfilling.

[0086] The above are merely embodiments of the present invention and are not intended to limit the invention. Those skilled in the art will recognize that the present invention can have various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A roadbed filler, characterized in that, The roadbed filler includes filler A and filler B; Wherein, the filler A includes cement, coal-based solid waste, water and water-reducing agent; in the filler A, the coal-based solid waste is fly ash, the fly ash is grade III fly ash, and the mass ratio of cement to fly ash is 8~12:88~92; Based on the total mass of the cement and the coal-based solid waste as 100%, the water content is 65-75% by mass, and the water-reducing agent content is 1.5-2.5% by mass. The filler B comprises rubber waste pulverized particles, sepiolite, bisphenol A glycidyl ether dimethacrylate, and a dispersant; in the filler B, the mass content of the rubber waste pulverized particles is 11-15%, the mass content of the sepiolite is 1-2%, the mass content of the bisphenol A glycidyl ether dimethacrylate is 0.5-1.5%, and the mass content of the dispersant is 4-5%. With the total mass of packing A as 100%, the mass content of packing B is 16.5~23.5%.

2. The roadbed filler according to claim 1, characterized in that, The mass ratio of the sepiolite to the bisphenol A glycidyl ether dimethacrylate is 1~4:

1.

3. The roadbed filler material according to claim 1 or 2, characterized in that, The cement is Psa32.5 cement, and / or the water-reducing agent is polycarboxylate water-reducing agent, and / or the average particle size of the rubber waste crushed particles is 1~2mm, and / or the dispersant is polyethylene glycol.

4. The roadbed filler according to claim 3, characterized in that, The density of the roadbed fill material is 1200~1400 kg / m³. 3 .

5. A method for preparing the roadbed filler material according to any one of claims 1 to 4, characterized in that, The preparation method includes: Step S1: Cement, coal-based solid waste, water and water-reducing agent are mixed in the first step to obtain filler A; Step S2: Sepiolite, dispersant, rubber waste granules and bisphenol A glycidyl ether dimethacrylate are mixed for the second time to obtain filler B; Step S3: Mix the filler A and the filler B for the third time to obtain the roadbed filler.

6. The preparation method according to claim 5, characterized in that, Step S2 includes: Step S21: Divide the rubber waste pulverized particles into two parts to obtain the first pulverized particles and the second pulverized particles. Step S22: The sepiolite and the dispersant are stirred for the first time to obtain a first mixture; Step S23: The first mixture and the first pulverized particles are stirred for the second time to obtain a second mixture; Step S24: The second mixture, the second pulverized particles, and the bisphenol A glycidyl ether dimethacrylate are subjected to a third stirring to obtain the filler B.

7. The preparation method according to claim 6, characterized in that, The mass ratio of the first pulverized particles to the second pulverized particles is 3~6:1.

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