A method for preparing fly ash roadbed composite material

Abstract

The invention discloses a method for preparing a fly ash roadbed composite material, comprising the steps of: S1, taking fly ash, silica gel particles, magnesium hydroxide, sodium bicarbonate and water; S2, mixing sodium bicarbonate and water to obtain a sodium bicarbonate aqueous solution; S3, uniformly mixing the sodium bicarbonate aqueous solution, silica gel particles and magnesium hydroxide to obtain an auxiliary material mixture; S4, sending the auxiliary material mixture and fly ash into a mixing device, the mixing device comprising a body, a first feed pipe, a second feed pipe and a discharge pipe, the body being provided with a first feed channel, a second feed channel, an injection channel, a high-pressure gas storage chamber and a storage chamber, the fly ash collides with the auxiliary material mixture in the second feed channel to form a mixed material, and the mixed material enters the injection channel and is injected; S5, after the material is unloaded, it is transported to the construction site and compacted after laying. Compared with the prior art, the invention can significantly improve the preparation efficiency of fly ash roadbed materials.

Description

Technical Field

[0001] The invention relates to the technical field of roadbed materials, and in particular to a method for preparing a fly ash roadbed composite material. Background Art

[0002] The roadbed is the foundation of the road surface. The existing roadbed filling body is generally made of soil and gravel materials. With the continuous progress of infrastructure construction, traditional roadbed construction materials are gradually scarce. Fly ash is an industrial byproduct and one of the largest industrial pollutants. At present, the utilization rate of fly ash is low, and the accumulation of a large amount of fly ash will cause land waste. How to achieve the effective treatment and utilization of fly ash has become an urgent problem to be solved.

[0003] The prior art provides many methods for applying fly ash materials, such as the fly ash-soil composite material for highway roadbed and its preparation method, which is a mixture of fly ash, soil and polypropylene fiber. The process is simple and reliable, ensuring the good antifreeze performance of the fly ash-soil mixture. The unconfined compressive strength of the fly ash-soil mixed with polypropylene fiber is higher than that of pure fly ash-soil, which is 1.26-1.74 times its strength. According to the freezing damage mechanism and structural form characteristics of the roadbed in the seasonal freezing area, the present invention adopts a new type of material with good freeze-thaw resistance, high strength, low price and environmental protection as the roadbed filler. However, the preparation process of the fly ash material in the prior art is relatively inefficient and the material uniformity is not good.

[0004] In view of this, a preparation method of a fly ash roadbed composite material is proposed. Summary of the invention

[0005] The object of the present invention is to provide a method for preparing a fly ash roadbed composite material, which can significantly improve the preparation efficiency of the fly ash roadbed material.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A method for preparing a fly ash roadbed composite material comprises the following steps:

[0008] S1, take 68-73 parts by weight of fly ash, 24-26 parts by weight of silica gel particles, 2-4 parts by weight of magnesium hydroxide, 1-3 parts by weight of sodium bicarbonate and 3-9 parts by weight of water;

[0009] S2, mixing sodium bicarbonate and water to obtain a sodium bicarbonate aqueous solution;

[0010] S3, mixing the sodium bicarbonate aqueous solution, silica gel particles and magnesium hydroxide uniformly to obtain an auxiliary material mixture;

[0011] S4. Feed the auxiliary material mixture and fly ash into a mixing device, the mixing device comprising a body, a first feed pipe, a second feed pipe and a discharge pipe, the body being provided with a first feed channel, a second feed channel, an injection channel, a high-pressure gas storage chamber and a storage chamber, the first feed pipe being connected to the first feed channel, the second feed pipe being connected to the second feed channel, the first feed channel being vertically connected to the side of the second feed channel, the second feed channel being vertically connected to the injection channel, the injection channel being provided with a first electrically controlled valve and a second electrically controlled valve, the connection point between the second feed channel and the injection channel being located between the first electrically controlled valve and the second electrically controlled valve The valve is between the two ends of the injection channel, one end of which is connected to the high-pressure air storage chamber, and the other end is directed to the side wall of the storage bin; when mixing, the auxiliary material mixture and the fly ash are alternately fed through the first feeding pipe and the second feeding pipe respectively by a material conveyor, a quantitative auxiliary material mixture is first fed through the first feeding pipe, and then a quantitative fly ash is fed through the second feeding pipe, the fly ash collides with the auxiliary material mixture in the second feeding channel to form a mixed material, the mixed material enters the injection channel, after a quantitative amount of the mixed material is accumulated in the injection channel, the first electric control valve and the second electric control valve are opened, the mixed material is ejected, and falls into the storage chamber after colliding with the side wall of the storage chamber;

[0012] S5. After the material is discharged from the storage cavity through the discharge pipe, it is transported to the construction site and compacted after laying.

[0013] In a preferred embodiment, the pressure of the high-pressure air outlet cavity is 10 MPa-20 MPa.

[0014] In a preferred embodiment, the ratio of the auxiliary material mixture and the fly ash fed alternately each time conforms to the ratio of the total amount of the auxiliary material mixture and the fly ash.

[0015] In a preferred embodiment, the feeding speed in the first feeding pipe is 5-10 m / s, and the feeding speed in the second feeding pipe is 10-20 m / s.

[0016] In a preferred embodiment, an arc-shaped groove is provided on the second feed channel at a position corresponding to the first feed channel, and the auxiliary material mixture entering the second feed channel through the first feed channel hits the arc-shaped groove and disperses radially.

[0017] In a preferred embodiment, a one-way passing device is provided at the end of the second feed channel, and the one-way passing device includes a first arc plate and a second arc plate, one side of the first arc plate and the second arc plate are connected to the side wall of the second feed channel, and the other ends are in close contact with each other, and the concave arc surfaces of the first arc plate and the second arc plate face the end of the second feed channel.

[0018] In a preferred embodiment, the first curved plate and the second curved plate are made of rubber, plastic or stainless steel.

[0019] In a preferred embodiment, a closing piece is provided at the contact end of the first arc plate and the second arc plate. The closing piece is configured in a sheet or strip shape and is made of an elastic material.

[0020] In a preferred embodiment, the elastic material is silicone or rubber.

[0021] In a preferred embodiment, one end of the first arc plate and the second arc plate connected to the side wall of the second feed channel is provided with a connecting component, the connecting component is arranged on the concave arc surface, the connecting component includes a strip-shaped protrusion and a plurality of connecting units arranged on the strip-shaped protrusion, the connecting unit includes a connecting rod and a connecting head, the connecting rod connects the strip-shaped protrusion and the connecting head, the connecting head is provided with a first electrode sheet, the side wall of the second feed channel is provided with a connecting hole, the edge of the connecting hole is provided with a limiting edge, and a second electrode sheet is provided inside, the connecting head is limited in the connecting hole and can move in the connecting hole.

[0022] Compared with the prior art, the present invention provides a method for preparing a fly ash roadbed composite material, which first mixes materials other than fly ash to obtain an auxiliary material mixture, and then feeds the auxiliary material mixture and fly ash into a mixing device for mixing. In the mixing device, an impact mixing method is mainly used, which can significantly improve the mixing effect and mixing efficiency, so that the uniformity and bonding degree of the mixed materials are improved. Specifically, when mixing, the auxiliary material mixture and fly ash are alternately fed through the first feeding pipe and the second feeding pipe respectively by a material conveyor, and a quantitative auxiliary material mixture is first fed through the first feeding pipe, and then a quantitative fly ash is fed through the second feeding pipe. After the fly ash collides with the auxiliary material mixture in the second feeding channel to form a mixed material, the mixed material enters the injection channel, and after a quantitative amount of the mixed material is accumulated in the injection channel, the first electric control valve and the second electric control valve are opened, and the mixed material is ejected, and falls into the storage cavity after colliding with the side wall of the storage cavity. In the above process, the material has undergone two violent collisions. The first time is when the auxiliary material mixture enters the second feeding pipe, the fly ash passes through the space rich in the auxiliary material mixture, so that the auxiliary material mixture is wrapped on the fly ash, so that the auxiliary material mixture and the fly ash are fully mixed for the first time, and then enter the injection channel after mixing, and are sprayed in the injection channel, similar to the shooting method, the sprayed mixture collides with the side wall of the storage box, so that the fly ash and the auxiliary material mixture are further fully mixed under high pressure to achieve a good mixing effect. In general, in the above process, through two collisions, the auxiliary material mixture and the fly ash are fully mixed under high pressure. Compared with the ordinary mechanical mixing method and the pure air collision method, the mixing process is gradual, that is, first the auxiliary material mixture is wrapped on the fly ash, and then a shooting-like method is used to make the mixture of the fly ash and the auxiliary material mixture collide on the hard side wall of the storage box to achieve a good mixing effect, which can effectively improve the mixing efficiency and mixing effect, thereby improving the efficiency and quality of material processing as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The invention relates to a longitudinal cross-sectional structural schematic diagram of a mixing device used in a method for preparing a fly ash roadbed composite material.

[0024] Figure 2 The present invention relates to a schematic diagram of the matching structure of a first arc plate and a side wall of a second material conveying channel of a mixing device used in a method for preparing a fly ash roadbed composite material.

[0025] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of part A.

[0026] Figure 4 The invention relates to a schematic diagram of the matching structure of a connecting rod and a connecting hole in a method for preparing a fly ash roadbed composite material.

[0027] In the picture

[0028] Body 1; first feed pipe 2; second feed pipe 3; discharge pipe 4; first feed channel 5; second feed channel 6; arc groove 7; first arc plate 8; second arc plate 9; closure 10; strip protrusion 11; connecting rod 12; connecting head 13; first electrode sheet 14; connecting hole 15; second electrode sheet 16; injection channel 17; first electric control valve 18; second electric control valve 19; high-pressure gas storage chamber 20; storage chamber 21; limiting edge 22. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0030] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0031] As shown in the picture Figure 4 As shown, a method for preparing a fly ash roadbed composite material comprises the following steps:

[0032] S1, take 68-73 parts by weight of fly ash, 24-26 parts by weight of silica gel particles, 2-4 parts by weight of magnesium hydroxide, 1-3 parts by weight of sodium bicarbonate and 3-9 parts by weight of water;

[0033] S2, mixing sodium bicarbonate and water to obtain a sodium bicarbonate aqueous solution;

[0034] S3, mixing the sodium bicarbonate aqueous solution, silica gel particles and magnesium hydroxide uniformly to obtain an auxiliary material mixture;

[0035] S4. Feed the auxiliary material mixture and fly ash into a mixing device, the mixing device comprising a body 1, a first feed pipe 2, a second feed pipe 3 and a discharge pipe 4, the body 1 is provided with a first feed channel 5, a second feed channel 6, an injection channel 17, a high-pressure gas storage chamber 20 and a storage chamber 21, the first feed pipe 2 is connected to the first feed channel 5, the second feed pipe 3 is connected to the second feed channel 6, the first feed channel 5 is vertically connected to the side of the second feed channel 6, the second feed channel 6 is vertically connected to the injection channel 17, the injection channel 17 is provided with a first electric-controlled valve 18 and a second electric-controlled valve 19, the connection point between the second feed channel 6 and the injection channel 17 is located between the first electric-controlled valve 18 and the second electric-controlled valve 19, The first and second electrically controlled valves 18 and 19 are connected to each other, one end of the injection channel 17 is connected to the high-pressure gas storage chamber 20, and the other end points to the side wall of the storage bin; when mixing, the auxiliary material mixture and the fly ash are alternately fed through the first feeding pipe 2 and the second feeding pipe 3 respectively by a material conveyor, a quantitative auxiliary material mixture is first fed through the first feeding pipe 2, and then a quantitative fly ash is fed through the second feeding pipe 3, the fly ash collides with the auxiliary material mixture in the second feeding channel 6 to form a mixed material, the mixed material enters the injection channel 17, after a quantitative amount of the mixed material is accumulated in the injection channel 17, the first electrically controlled valve 18 and the second electrically controlled valve 19 are opened, the mixed material is ejected, and falls into the storage chamber 21 after colliding with the side wall of the storage chamber 21;

[0036] S5. After the material is discharged from the storage chamber 21 through the discharge pipe, it is transported to the construction site and compacted after laying.

[0037] A method for preparing a fly ash roadbed composite material of the present embodiment, firstly, materials other than fly ash are mixed to obtain an auxiliary material mixture, and then the auxiliary material mixture and fly ash are sent to a mixing device for mixing. In the mixing device, an impact mixing method is mainly used, which can significantly improve the mixing effect and mixing efficiency, so that the uniformity and bonding degree of the mixed materials are improved. Specifically, when mixing, the auxiliary material mixture and fly ash are alternately sent through the first feeding pipe 2 and the second feeding pipe 3 by a material conveyor, and a quantitative auxiliary material mixture is first sent through the first feeding pipe 2, and then a quantitative fly ash is sent through the second feeding pipe 3. The fly ash collides with the auxiliary material mixture in the second feeding channel 6 to form a mixed material, and the mixed material enters the injection channel 17. After a quantitative amount of the mixed material is accumulated in the injection channel 17, the first electric control valve 18 and the second electric control valve 19 are opened, and the mixed material is ejected, and collides with the side wall of the storage chamber 21 and falls into the storage chamber 21. In the above process, the material has undergone two violent collisions. The first time is when the auxiliary material mixture enters the second feed pipe 3, the fly ash passes through the space rich in the auxiliary material mixture, so that the auxiliary material mixture is wrapped on the fly ash, so that the auxiliary material mixture and the fly ash are fully mixed for the first time, and then enter the injection channel 17 after mixing, and are injected in the injection channel 17, similar to the shooting method, the injected mixture collides with the side wall of the storage box, so that the fly ash and the auxiliary material mixture are further fully mixed under high pressure to achieve a good mixing effect. In general, in the above process, through two collisions, the auxiliary material mixture and the fly ash are fully mixed under high pressure, compared with the ordinary mechanical mixing method and the pure air collision method, the mixing process is gradual, that is, first the auxiliary material mixture is wrapped on the fly ash, and then a shooting-like method is adopted to make the mixture of the fly ash and the auxiliary material mixture collide on the hard side wall of the storage box, so as to achieve a good mixing effect, which can effectively improve the mixing efficiency and mixing effect, thereby improving the efficiency and quality of material processing as a whole.

[0038] Furthermore, the pressure of the high-pressure air outlet cavity is 10 MPa-20 MPa.

[0039] The ratio of the auxiliary material mixture and fly ash fed alternately each time conforms to the ratio of the total amount of the auxiliary material mixture and fly ash, that is, each material conveyance is carried out according to the corresponding ratio, so that the auxiliary material mixture and fly ash are conveyed and mixed almost synchronously.

[0040] In order to achieve the first full mixing of the auxiliary material mixture and the fly ash, the feeding speed in the first feeding pipe 2 is 5-10 m / s, and the feeding speed in the second feeding pipe 3 is 10-20 m / s. After the auxiliary material mixture is fed at a slower speed in the first material pipe, it is dispersed in the second feeding pipe 3, and then the fly ash entering at a high speed through the second feeding pipe 3 hits the auxiliary material mixture, so that the auxiliary material mixture is coated on the fly ash, achieving the first full mixing.

[0041] In order to ensure that the auxiliary material mixture can be fully dispersed after entering the second feeding channel 6, an arc-shaped groove 7 is provided on the second feeding channel 6 at a position corresponding to the first feeding channel 5. The auxiliary material mixture entering the second feeding channel 6 through the first feeding channel 5 hits the arc-shaped groove 7 and is dispersed radially.

[0042] In order to ensure that the mixture of the auxiliary material mixture and the fly ash can be transported in one direction and avoid backflow during the injection process, a one-way passing device is provided at the end of the second feeding channel, and the one-way passing device includes a first arc plate 8 and a second arc plate 9. One side of the first arc plate 8 and the second arc plate 9 is connected to the side wall of the second feeding channel, and the other ends are in close contact with each other. The concave arc surfaces of the first arc plate 8 and the second arc plate 9 face the end of the second feeding channel. Through such a setting, the one-way setting of the second feeding channel is realized, so that when the injection operation is performed, it is closed in the opposite direction of the second conveying channel, effectively ensuring the injection pressure in the injection channel 17.

[0043] Specifically, the first arc plate 8 and the second arc plate 9 are made of rubber, plastic or stainless steel.

[0044] In order to achieve a better sealing effect between the first arc plate 8 and the second arc plate 9, a sealing piece 10 is provided at the contact end of the first arc plate 8 and the second arc plate 9. The sealing piece 10 is configured in a sheet or strip shape and is made of elastic material.

[0045] Specifically, the elastic material is silicone or rubber.

[0046] In order to realize automatic triggering of the injection operation, a connecting component is provided at one end of the first arc plate 8 and the second arc plate 9 connected to the side wall of the second feed channel, and the connecting component is arranged on the concave arc surface. The connecting component includes a strip-shaped protrusion 11 and a plurality of connecting units arranged on the strip-shaped protrusion 11. The connecting unit includes a connecting rod 12 and a connecting head 13. The connecting rod 12 connects the strip-shaped protrusion 11 and the connecting head 13. The connecting head 13 is provided with a first electrode sheet 14. A connecting hole 15 is provided on the side wall of the second feed channel. A limiting edge 22 is provided on the edge of the connecting hole 15, and a second electrode sheet 16 is provided inside. The connecting head 13 is limited in the connecting hole 15 and can move in the connecting hole 15. Under such a structural setting, on the one hand, it is helpful to realize the movable setting of the first curved plate 8 and the second curved plate 9, that is, the first curved plate 8 and the second curved plate 9 can be deflected downward. On the other hand, through the setting of the connection unit, the first curved plate 8 and the second curved plate 9 can be effectively limited to deflect upward, and the angle of the first curved plate 8 and the second curved plate 9 can be limited to avoid the first curved plate 8 and the second curved plate 9 turning up when the injection pressure is too large. In addition, through the setting of the first electrode sheet 14 and the second electrode sheet 16, the automatic triggering of the injection operation can be realized. Specifically, during the process of two consecutive feedings of the second feeding channel 6, if the first electrode sheet 14 and the second electrode sheet 16 are not in contact, a potential signal is generated, indicating that the material in the injection channel 17 has accumulated to a sufficient amount and needs to be injected. At this time, the first electric control valve 18 and the second electric control valve 19 are controlled to open to realize a spraying operation, thereby realizing the automatic triggering of the injection operation, which is conducive to the efficient performance of the mixing work.

[0047] The advantage of setting the first curved plate 8 and the second curved plate 9 is that: the first curved plate 8 and the second curved plate 9 are set close to the end of the second feeding channel 6, that is, close to the injection channel 17. During the feeding process of the second discharging channel, the first curved plate 8 and the second curved plate 9 are pushed to deflect downward, thereby opening the second feeding channel 6. When the first curved plate 8 and the second curved plate 9 are deflected, the material under the first curved plate 8 and the second curved plate 9 is moved, so that the material is broadcast to the two ends of the injection channel 17. Of course, the two ends here are just the directions of the two ends, and it is not strictly required to move the material to the two ends of the injection channel 17. The material is fluctuated to both sides by the first curved plate 8 and the second curved plate 9, so that the injection channel 17 can be fully filled, avoiding the material from being blocked at the connection position of the second feeding channel 6 and the injection channel 17, and effectively ensuring the realization of high mixing efficiency.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "include..." or "comprise..." do not exclude the existence of other elements in the process, method, article or terminal device including the elements. In addition, in this article, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself.

[0049] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to the embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A method for preparing a fly ash roadbed composite material, characterized in that: Includes steps: S1, take 68-73 parts by weight of fly ash, 24-26 parts by weight of silica gel particles, 2-4 parts by weight of magnesium hydroxide, 1-3 parts by weight of sodium bicarbonate and 3-9 parts by weight of water; S2, mixing sodium bicarbonate and water to obtain a sodium bicarbonate aqueous solution; S3, mixing the sodium bicarbonate aqueous solution, silica gel particles and magnesium hydroxide uniformly to obtain an auxiliary material mixture; S4. Feed the auxiliary material mixture and fly ash into a mixing device, the mixing device comprising a body, a first feed pipe, a second feed pipe and a discharge pipe, the body being provided with a first feed channel, a second feed channel, an injection channel, a high-pressure gas storage chamber and a storage chamber, the first feed pipe being connected to the first feed channel, the second feed pipe being connected to the second feed channel, the first feed channel being vertically connected to the side of the second feed channel, the second feed channel being vertically connected to the injection channel, the injection channel being provided with a first electrically controlled valve and a second electrically controlled valve, the connection point between the second feed channel and the injection channel being located between the first electrically controlled valve and the second electrically controlled valve The valve is between the two valves, one end of the injection channel is connected to the high-pressure gas storage chamber, and the other end points to the side wall of the storage chamber; when mixing, the auxiliary material mixture and fly ash are alternately fed through the first feeding pipe and the second feeding pipe respectively by a material conveyor, a quantitative auxiliary material mixture is first fed through the first feeding pipe, and then a quantitative fly ash is fed through the second feeding pipe, the fly ash collides with the auxiliary material mixture in the second feeding channel to form a mixed material, the mixed material enters the injection channel, after a quantitative amount of the mixed material is accumulated in the injection channel, the first electric control valve and the second electric control valve are opened, the mixed material is ejected, and falls into the storage chamber after colliding with the side wall of the storage chamber; S5, after unloading the material from the storage cavity through the discharge pipe, transporting the material to the construction site, laying and compacting it; A one-way passing device is provided at the end of the second feed channel, and the one-way passing device includes a first arc plate and a second arc plate, one side of the first arc plate and the second arc plate are connected to the side wall of the second feed channel, and the other ends are in close contact with each other, and the concave arc surfaces of the first arc plate and the second arc plate face the end of the second feed channel; One end of the first arc plate and the second arc plate connected to the side wall of the second feed channel is provided with a connecting component, the connecting component is arranged on the concave arc surface, the connecting component includes a strip-shaped protrusion and a plurality of connecting units arranged on the strip-shaped protrusion, the connecting unit includes a connecting rod and a connecting head, the connecting rod connects the strip-shaped protrusion and the connecting head, the connecting head is provided with a first electrode sheet, a connecting hole is provided on the side wall of the second feed channel, a limiting edge is provided on the edge of the connecting hole, a second electrode sheet is provided inside, and the connecting head is limited in the connecting hole and can move in the connecting hole.

2. The method for preparing a fly ash roadbed composite material according to claim 1, characterized in that: The pressure of the high-pressure gas storage chamber is 10 MPa-20 MPa.

3. The method for preparing a fly ash roadbed composite material according to claim 1, characterized in that: The ratio of the auxiliary material mixture and the fly ash fed alternately each time conforms to the ratio of the total amount of the auxiliary material mixture and the fly ash.

4. The method for preparing a fly ash roadbed composite material according to claim 1, characterized in that: The feeding speed in the first feeding pipe is 5-10 m / s, and the feeding speed in the second feeding pipe is 10-20 m / s.

5. The method for preparing a fly ash roadbed composite material according to claim 1, characterized in that: An arc-shaped groove is arranged on the second feeding channel at a position corresponding to the first feeding channel, and the auxiliary material mixture entering the second feeding channel through the first feeding channel hits the arc-shaped groove and then disperses radially.

6. The method for preparing a fly ash roadbed composite material according to claim 1, characterized in that: The first arc plate and the second arc plate are made of rubber, plastic or stainless steel.

7. The method for preparing a fly ash roadbed composite material according to claim 1, characterized in that: A closing piece is provided at the contact end of the first arc plate and the second arc plate. The closing piece is configured in a sheet or strip shape and is made of an elastic material.

8. The method for preparing a fly ash roadbed composite material according to claim 7, characterized in that: The elastic material is silicone or rubber.

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