Composite pile premixed fluidized solidified soil slurry and preparation method thereof

Abstract

This application discloses a premixed fluidized bed slurry for composite piles and its preparation method. The premixed fluidized bed slurry is prepared from the following raw materials in parts by weight: 100-150 parts cement; 200-220 parts fine sand; 20-30 parts red mud; 5-10 parts calcium oxide; 0.5-1.2 parts nano-zinc oxide modified epoxy resin; and 70-90 parts water. The premixed fluidized bed slurry has a spread of 170 mm or more, a 28-day unconfined compressive strength of over 10 MPa, and a strength loss rate of less than 16% after 5 freeze-thaw cycles.

Description

Technical Field

[0001] This application relates to the field of building materials technology, and in particular to a premixed fluidized solidified slurry for composite piles and its preparation method. Background Technology

[0002] To improve land utilization, modern buildings are often constructed as high-rises. To enhance the safety of these high-rises, composite pile foundations are required. Composite pile foundations use liquid-solidified soil slurry as a cementing material, which is injected into holes formed by a long spiral drill to create pre-mixed, fluidized, solidified soil piles. The piles, the soil between the piles, the cushion layer, and the foundation together form a composite pile foundation, thereby improving load-bearing capacity and safety.

[0003] Chinese invention patent with authorization announcement number CN111908855B provides a premixed fluidized solidified soil slurry for composite piles and its preparation method. However, it has poor fluidity, is not easy to operate, and has a complex composition due to the addition of various modifiers and activators, making it extremely inconvenient to operate. Summary of the Invention

[0004] This invention aims to solve at least one of the problems of the prior art. Therefore, this invention provides a premixed fluidized solidified soil slurry for composite piles, prepared from raw materials comprising the following parts by weight: 100-150 parts by weight of cement; 200-220 parts by weight of fine sand; 20-30 parts by weight of red mud; 5-10 parts by weight of calcium oxide; 0.5-1.2 parts by weight of nano-zinc oxide modified epoxy resin; 70-90 parts by weight of water.

[0005] Through the above technical solution, the raw materials for preparing premixed fluidized solidified soil slurry for composite piles, such as cement, red mud, and nano-zinc oxide modified epoxy resin, can form a good gradation, exhibiting good fluidity, ease of grouting, and an extension of 170 mm or more. The addition of nano-zinc oxide modified epoxy resin can form a good cross-linking effect, and by adding an appropriate amount of calcium oxide to control the chelation effect to a certain extent, the 28-day unconfined compressive strength can reach over 10 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach below 16%. Furthermore, this invention can utilize a portion of industrial waste red mud, saving costs.

[0006] In one or more embodiments of the present invention, the mass ratio of cement, red mud, and nano zinc oxide modified epoxy resin is (116-124):(21-29):1.

[0007] By controlling the mass ratio of cement, red mud, and nano zinc oxide modified epoxy resin through the above technical solutions, the 28-day unconfined compressive strength can reach more than 12 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach less than 14%.

[0008] In one or more embodiments of the present invention, the nano-zinc oxide modified epoxy resin is prepared by the following steps: adding nano-zinc oxide to a mixed solvent of ethanol and water, stirring, adding a silane coupling agent, reacting, centrifuging, and drying the solid to obtain surface-modified nano-zinc oxide; mixing the surface-modified nano-zinc oxide, epoxy resin, methyltetrahydrophthalic anhydride, and 2,4,6-tris(dimethylaminomethyl)phenol evenly, vacuum degassing, and curing to obtain nano-zinc oxide modified epoxy resin.

[0009] In one or more embodiments of the present invention, the nano zinc oxide is zinc oxide nanoflower, which is prepared by hydrothermal synthesis.

[0010] Preferably, the preparation method of zinc oxide nanoflowers includes preparing an aqueous solution of zinc nitrate and an aqueous solution of hexamethylenetetramine, mixing the two solutions evenly and stirring; pouring the above solution into a reaction vessel, reacting at 80-120℃ for 10-15 hours, cooling, washing, and drying to obtain zinc oxide nanoflowers.

[0011] Through the above technical solution, when the nano zinc oxide is zinc oxide nanoflower, the strength loss rate after 5 freeze-thaw cycles can reach less than 12%. This may be because the zinc oxide nanoflower has a dendritic structure, which is beneficial to reducing the impact of freeze-thaw on the premixed fluidized solidified soil slurry of composite piles.

[0012] In one or more embodiments of the present invention, the raw materials for preparing the premixed fluidized solidified soil slurry for the composite pile further include additives, wherein the additives are one or both of aramid fiber and cobalt acetate.

[0013] With the above technical solution, when cobalt acetate or aramid fiber is added to the raw materials for preparing premixed fluidized solidified soil slurry for composite piles, the 28-day unconfined compressive strength can reach more than 13 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach 11% or less.

[0014] In one or more embodiments of the present invention, the aramid fiber is a dopamine-coated aramid fiber.

[0015] Through the above technical solution, when the aramid fiber is a dopamine-coated aramid fiber, the 28-day unconfined compressive strength can reach more than 13 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach less than 10%.

[0016] In one or more embodiments of the present invention, the additive is composed of dopamine-coated aramid fibers and cobalt acetate in a weight ratio of (1.9-2.1):0.3.

[0017] Through the above technical solution, when dopamine-coated aramid fibers and cobalt acetate are added to the raw materials for preparing premixed fluidized solidified soil slurry for composite piles, the 28-day unconfined compressive strength can reach more than 14 MPa, the strength loss rate after 5 freeze-thaw cycles can reach 9% or less, and the spread is significantly increased, with good fluidity, which facilitates grouting. It can be seen that dopamine-coated aramid fibers and cobalt acetate have a synergistic effect.

[0018] In a second aspect of the present invention, the present invention provides a method for preparing the premixed fluidized solidified soil slurry for composite piles as described in the first aspect of the present invention, comprising: mixing and stirring the raw materials for preparing the premixed fluidized solidified soil slurry for composite piles to obtain the premixed fluidized solidified soil slurry for composite piles.

[0019] In one or more embodiments of the present invention, a method for preparing premixed fluidized solidified soil slurry for composite piles includes: mixing cement, red mud, nano zinc oxide modified epoxy resin and half the total amount of water, stirring for the first time, adding other raw materials and the remaining water, stirring for the second time, and obtaining the premixed fluidized solidified soil slurry for composite piles.

[0020] Through the above technical solution, cement, red mud, nano zinc oxide modified epoxy resin and some water are first stirred. The cross-linking effect of cement, red mud and nano zinc oxide modified epoxy resin is more complete, the 28-day unconfined compressive strength is enhanced and the strength loss rate after 5 freeze-thaw cycles is reduced.

[0021] In one or more embodiments of the present invention, the first stirring includes stirring at 850-950 r / min for 8-12 min and stirring at 350-450 r / min for 10-15 min.

[0022] Through the above technical solutions, when cement, red mud, nano zinc oxide modified epoxy resin and half the total amount of water are mixed, the mixture is first stirred at high speed and then at low speed. The cross-linking effect of cement, red mud and nano zinc oxide modified epoxy resin is more complete, the 28-day unconfined compressive strength is enhanced, and the strength loss rate after 5 freeze-thaw cycles is reduced.

[0023] The beneficial effects of this invention are as follows: 1. This invention provides a premixed fluidized solidified soil slurry for composite piles. Cement, red mud, and nano-zinc oxide modified epoxy resin can form a good gradation, with good fluidity, easy grouting, and an expansion of 170 mm or more. The addition of nano-zinc oxide modified epoxy resin can form a good cross-linking effect. With the addition of an appropriate amount of calcium oxide, the chelation effect is controlled to a certain extent. The 28-day unconfined compressive strength can reach more than 12 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach less than 14%. In addition, this invention can utilize a portion of industrial waste red mud, saving costs.

[0024] 2. This invention provides a premixed fluidized solidified soil slurry for composite piles. It further uses zinc oxide nanoflowers to prepare nano zinc oxide modified epoxy resin, and the strength loss rate after 5 freeze-thaw cycles can reach less than 12%. With the addition of dopamine-coated aramid fibers and cobalt acetate, the 28-day unconfined compressive strength can reach more than 14 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach 9% or less.

[0025] 3. This invention provides a method for preparing premixed fluidized solidified soil slurry for composite piles, which is easy to operate and facilitates industrialization. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments. However, the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the following embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available. Unless otherwise stated, the technical and scientific terms used herein have the same meaning as those familiar with the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be applied to the present invention.

[0027] Examples 1-9 Examples 1-9 provide a premixed fluidized solidified soil slurry for composite piles, which is prepared from the following raw materials in parts by weight: 100-150 kg of cement; 200-220 kg of fine sand; 20-30 kg of red mud; 70-90 kg of water; 5-10 kg of calcium oxide; and 0.5-1.2 kg of nano zinc oxide modified epoxy resin.

[0028] The specific raw materials and weights used to prepare the premixed fluidized solidified soil slurry for composite piles in Examples 1-9 are shown in Table 1.

[0029] The nano zinc oxide is commercially available and was purchased from Nanjing Xianfeng Nanomaterials Technology Co., Ltd.

[0030] The preparation method of nano-zinc oxide modified epoxy resin is as follows: Nano zinc oxide was added to a mixed solvent of ethanol and water (volume ratio of ethanol to water was 1:9), and the mass fraction of nano zinc oxide was controlled at 4%. The mixture was stirred for 30 min, ultrasonically dispersed, and then silane coupling agent KH-550 was added. The mixture was reacted, centrifuged, and the solid was dried to obtain surface-modified nano zinc oxide. Epoxy resin E51 and surface-modified nano zinc oxide were mixed at a mass ratio of 100:0.4, stirred at 60℃, and ultrasonically dispersed. The mixture, methyltetrahydrophthalic anhydride, and 2,4,6-tris(dimethylaminomethyl)phenol were weighed at a weight ratio of 100:80:1.5, stirred evenly, degassed under vacuum, and cured to obtain nano zinc oxide modified epoxy resin.

[0031] The preparation method of the above-mentioned premixed fluidized solidified soil slurry for composite piles includes: mixing cement, red mud, nano zinc oxide modified epoxy resin and half of the total amount of water, stirring at 900 r / min for 10 min, then stirring at 400 r / min for 13 min, adding other raw materials and remaining water, and stirring at 300 r / min for 23 min to obtain premixed fluidized solidified soil slurry for composite piles.

[0032] Table 1. Raw materials for preparing premixed fluidized solidified soil slurry for composite piles in Examples 1-9. Example 10 This embodiment provides a premixed fluidized solidified soil slurry for composite piles and its preparation method. The premixed fluidized solidified soil slurry and its preparation method for composite piles provided in this embodiment refer to Embodiment 2. The only difference between this embodiment and Embodiment 2 is that the nano zinc oxide used to prepare the nano zinc oxide modified epoxy resin is zinc oxide nanoflower.

[0033] The preparation method of zinc oxide nanoflowers is as follows: Prepare an aqueous solution of zinc nitrate with a concentration of 0.05 mol / L and an aqueous solution of hexamethylenetetramine with a concentration of 0.05 mol / L. Mix the two solutions in equal volumes and stir magnetically at a speed of 500 r / min for 5 min. Pour the above solution into a reaction vessel and react at 100℃ for 12 h. After natural cooling, wash with distilled water and dry to obtain zinc oxide nanoflowers.

[0034] Example 11 This embodiment provides a premixed fluidized solidified soil slurry for composite piles and its preparation method. The premixed fluidized solidified soil slurry and its preparation method for composite piles provided in this embodiment refer to Embodiment 10. The only difference between this embodiment and Embodiment 10 is that the raw materials for preparing the premixed fluidized solidified soil slurry for composite piles also include 2 kg of aramid fiber.

[0035] Example 12 This embodiment provides a premixed fluidized solidified soil slurry for composite piles and its preparation method. The premixed fluidized solidified soil slurry and its preparation method for composite piles provided in this embodiment refer to Embodiment 11. The only difference between this embodiment and Embodiment 11 is that the aramid fiber is a dopamine-coated aramid fiber.

[0036] The preparation method of dopamine-coated aramid fiber is as follows: Prepare a 10mM Tris-HCl solution, add dopamine hydrochloride to prepare a dopamine solution with a concentration of 3g / L, adjust the pH of the dopamine solution to 8.5 with sodium hydroxide solution, immerse the clean aramid fiber in the above dopamine solution, shake at 250℃ for 24h, take it out, wash and dry it to obtain dopamine-coated aramid fiber.

[0037] Example 13 This embodiment provides a premixed fluidized solidified soil slurry for composite piles and its preparation method. The premixed fluidized solidified soil slurry and its preparation method for composite piles provided in this embodiment refer to Embodiment 10. The only difference between this embodiment and Embodiment 10 is that the raw materials for preparing the premixed fluidized solidified soil slurry for composite piles also include 0.3 kg of cobalt acetate.

[0038] Example 14 This embodiment provides a premixed fluidized solidified soil slurry for composite piles and its preparation method. The premixed fluidized solidified soil slurry and its preparation method for composite piles provided in this embodiment refer to Embodiment 12. The only difference between this embodiment and Embodiment 12 is that the raw materials for preparing the premixed fluidized solidified soil slurry for composite piles also include 0.3 kg of cobalt acetate.

[0039] Example 15 This embodiment provides a premixed fluidized solidified soil slurry for composite piles and its preparation method. The premixed fluidized solidified soil slurry and its preparation method for composite piles provided in this embodiment refer to Embodiment 14. The only difference between this embodiment and Embodiment 14 is that the preparation method is as follows: cement, red mud, nano zinc oxide modified epoxy resin and half of the total amount of water are mixed and stirred at 900 r / min for 23 min. Other raw materials and the remaining water are added and stirred at 300 r / min for 23 min to obtain the premixed fluidized solidified soil slurry for composite piles.

[0040] Example 16 This embodiment provides a premixed fluidized solidified soil slurry for composite piles and its preparation method. The premixed fluidized solidified soil slurry for composite piles and its preparation method provided in this embodiment refer to Embodiment 14. The only difference between this embodiment and Embodiment 14 is that the preparation method is as follows: cement, red mud, nano zinc oxide modified epoxy resin and half of the total amount of water are mixed and stirred at 400 r / min for 23 min. Other raw materials and the remaining water are added and stirred at 300 r / min for 23 min to obtain the premixed fluidized solidified soil slurry for composite piles.

[0041] Example 17 This embodiment provides a premixed fluidized solidified soil slurry for composite piles and its preparation method. The premixed fluidized solidified soil slurry for composite piles and its preparation method provided in this embodiment refer to Embodiment 14. The only difference between this embodiment and Embodiment 14 is that the preparation method is as follows: all raw materials are mixed and stirred at 900 r / min for 10 min, at 400 r / min for 13 min, and at 300 r / min for 23 min to obtain the premixed fluidized solidified soil slurry for composite piles.

[0042] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that the raw materials used to prepare the premixed fluidized solidified soil slurry for composite piles do not include calcium oxide.

[0043] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that the raw materials for preparing the premixed fluidized solidified soil slurry for composite piles do not include nano zinc oxide modified epoxy resin.

[0044] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that the nano zinc oxide modified epoxy resin was replaced with 1 kg of nano zinc oxide, 1 kg of epoxy resin E51, and 1 kg of silane coupling agent KH-550.

[0045] Comparative Example 4 The difference between Comparative Example 4 and Example 2 is that the raw materials for preparing the premixed fluidized solidified soil slurry for composite piles do not include red mud.

[0046] The spread, 28-day unconfined compressive strength, and strength change rate after 5 freeze-thaw cycles of the premixed fluidized solidified soil slurry for composite piles obtained in the examples and comparative examples were tested, and the results are shown in Table 2.

[0047] Three test specimens with a diameter of 39.1 mm and a height of 80 mm were made from the premixed fluidized solidified soil slurry for composite piles obtained in the examples and comparative examples. After natural curing for 28 days, the specimens were tested according to the unconfined compressive strength test method published in JTJ05193 "Specifications for Geotechnical Testing of Highways". The average value of the unconfined compressive strength of the three test specimens is taken as the unconfined compressive strength of the premixed fluidized solidified soil slurry for composite piles obtained in the examples or comparative examples.

[0048] Loss of compressive strength after freeze-thaw: Tested according to T 0858-2009 "Freeze-thaw test method for inorganic binder stabilized materials"; The flowability was tested according to the test method of the flowability test method of the fluidized solidified soil mixture in DBJ51 / T188-2022: Technical Standard for Engineering Application of Premixed Fluidized Solidified Soil.

[0049] Table 2 shows the test results of the spread, 28-day unconfined compressive strength, and freeze-thaw cycle strength change rate of the premixed fluidized solidified soil slurry for composite piles obtained from the examples and comparative examples. Comparing Examples 2 with Examples 4 and 5, it can be seen that when the mass ratio of cement, red mud, and nano zinc oxide modified epoxy resin is (116-124):(21-29):1, the spread can reach more than 180 mm, the 28-day unconfined compressive strength can reach more than 12 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach less than 14%. This may be because cement, fine sand, red mud, and calcium oxide can form a good gradation, and the addition of nano zinc oxide modified epoxy resin can form a good cross-link with cement and red mud, thereby improving the strength of the premixed fluidized solidified soil slurry for composite piles.

[0050] Comparing Examples 2 with Examples 6 and 7, it can be seen that when the amount of calcium oxide is 5-10 parts by weight, the spread can reach more than 180 mm, the 28-day unconfined compressive strength can reach more than 10 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach less than 16%. This may be because adding calcium oxide can adjust the calcium content in the premixed fluidized solidified soil slurry of the composite pile and enhance the chelation degree of the system.

[0051] Comparing Examples 2 with Examples 8 and 9, it can be seen that when the amount of nano-zinc oxide modified epoxy resin is 0.5-1.2 parts by weight, the spread can reach more than 180 mm, the 28-day unconfined compressive strength can reach more than 10 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach less than 16%. This may be because the addition of nano-zinc oxide modified epoxy resin can form good cross-linking with cement and red mud, thereby improving the strength of the premixed fluidized solidified soil slurry of composite piles.

[0052] A comparison of Example 10 and Example 2 shows that when the nano zinc oxide is zinc oxide nanoflower, the strength loss rate after 5 freeze-thaw cycles can reach less than 12%. This may be because the zinc oxide nanoflower has a dendritic structure, which is beneficial to reducing the impact of freeze-thaw cycles on the premixed fluidized solidified soil slurry of composite piles.

[0053] A comparison of Example 11 and Example 10 shows that when aramid fiber is added to the raw materials for preparing premixed fluidized solidified soil slurry for composite piles, the 28-day unconfined compressive strength can reach more than 13 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach less than 11%.

[0054] A comparison of Example 12 and Example 11 shows that when the aramid fiber is a dopamine-coated aramid fiber, the 28-day unconfined compressive strength can reach more than 13 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach less than 10%.

[0055] A comparison of Example 13 and Example 10 shows that when cobalt acetate is added to the raw materials for preparing premixed fluidized solidified soil slurry for composite piles, the 28-day unconfined compressive strength can reach more than 13 MPa, and the strength loss rate after 5 freeze-thaw cycles can reach 11% or less.

[0056] Compared with Examples 12 and 13, Example 14 shows that when dopamine-coated aramid fibers and cobalt acetate are added to the raw materials for preparing premixed fluidized solidified soil slurry for composite piles, the 28-day unconfined compressive strength can reach more than 14 MPa, the strength loss rate after 5 freeze-thaw cycles can reach 9% or less, and the spread is significantly increased, with good fluidity, which facilitates grouting. It can be seen that dopamine-coated aramid fibers and cobalt acetate have a synergistic effect.

[0057] A comparison of Example 15 and Example 14 shows that when cement, red mud, nano zinc oxide modified epoxy resin and half the total amount of water are mixed and stirred at high speed without stirring at low speed, the 28-day unconfined compressive strength decreases and the strength loss rate after 5 freeze-thaw cycles increases.

[0058] A comparison of Example 16 and Example 14 shows that when cement, red mud, nano zinc oxide modified epoxy resin and half the total amount of water are mixed and stirred at low speed without high speed, the 28-day unconfined compressive strength decreases and the strength loss rate after 5 freeze-thaw cycles increases.

[0059] A comparison of Example 17 and Example 14 shows that when all raw materials are mixed and stirred together, the 28-day unconfined compressive strength decreases and the strength loss rate after 5 freeze-thaw cycles increases.

[0060] Comparing Example 2 with Comparative Example 1, it can be seen that when the raw materials for preparing premixed fluidized solidified soil slurry for composite piles do not include calcium oxide, the spread is less than 160 mm, the 28-day unconfined compressive strength is very low, and the strength after 5 freeze-thaw cycles is very high.

[0061] A comparison of Example 2 and Comparative Example 2 shows that when the raw materials for preparing premixed fluidized solidified soil slurry for composite piles do not include nano-zinc oxide modified epoxy resin, the spread is less than 170 mm, the 28-day unconfined compressive strength is very low, and the strength after 5 freeze-thaw cycles is very high.

[0062] Comparing Example 2 with Comparative Example 3, it can be seen that when nano zinc oxide, epoxy resin E51, and silane coupling agent in the raw materials for preparing premixed fluidized solidified soil slurry for composite piles are directly added without first reacting to prepare nano zinc oxide modified epoxy resin, the spread is less than 170 mm, the 28-day unconfined compressive strength is very low, and the strength after 5 freeze-thaw cycles is very high.

[0063] A comparison of Example 2 and Comparative Example 4 shows that when the raw materials for preparing premixed fluidized solidified soil slurry for composite piles do not include red mud, the spread is less than 170 mm, the 28-day unconfined compressive strength is very low, and the strength after 5 freeze-thaw cycles is very high.

[0064] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A composite pile ready-mixed fluidized solidified soil slurry, characterized by, It is prepared from raw materials comprising the following parts by weight: 100-150 parts by weight of cement; 200-220 parts by weight of fine sand; 20-30 parts by weight of red mud; 5-10 parts by weight of calcium oxide; 0.5-1.2 parts by weight of nano-zinc oxide modified epoxy resin; 70-90 parts by weight of water; The nano-zinc oxide modified epoxy resin is prepared by the following steps: adding nano-zinc oxide to a mixed solvent of ethanol and water, stirring, adding a silane coupling agent, reacting, centrifuging, and drying the solid to obtain surface-modified nano-zinc oxide; mixing the surface-modified nano-zinc oxide, epoxy resin, methyltetrahydrophthalic anhydride, and 2,4,6-tris(dimethylaminomethyl)phenol evenly, vacuum degassing, and curing to obtain nano-zinc oxide modified epoxy resin.

2. The composite pile of claim 1, wherein the premixed fluidized solidified soil slurry is characterized by, The mass ratio of cement, red mud, and nano zinc oxide modified epoxy resin is (116-124):(21-29):

1.

3. The composite pile of claim 1, wherein the premixed fluidized solidified soil slurry is characterized by, The zinc oxide nanoparticles are zinc oxide nanoflowers, which are prepared by hydrothermal synthesis.

4. The composite pile of claim 1, wherein the premixed fluidized solidified soil slurry is characterized by, The raw materials for preparing the premixed fluidized solidified soil slurry for the composite pile also include additives, which are one or both of aramid fiber and cobalt acetate.

5. The composite pile of claim 4, wherein the premixed fluidized solidified soil slurry is characterized by, The aramid fiber is a dopamine-coated aramid fiber.

6. The composite pile of claim 5, wherein the premixed fluidized solidified soil slurry is characterized by, The additive is composed of dopamine-coated aramid fibers and cobalt acetate in a weight ratio of (1.9-2.1):0.

3.

7. A method for preparing the composite pile premixed fluidized solidified soil slurry according to any one of claims 1-6, characterized in that, include: The raw materials for preparing the premixed fluidized solidified soil slurry for the composite pile are mixed and stirred to obtain the premixed fluidized solidified soil slurry for the composite pile.

8. The method for preparing the composite pile premixed fluidized solidified soil slurry according to claim 7, characterized in that, include: Cement, red mud, nano zinc oxide modified epoxy resin, and half the total amount of water are mixed and stirred for the first time. Other raw materials and the remaining water are added and stirred for the second time to obtain the premixed fluidized solidified soil slurry for the composite pile.

9. The method for preparing the composite pile premixed fluidized solidified soil slurry according to claim 8, characterized in that, The first stirring includes stirring at 850-950 r / min for 8-12 min and stirring at 350-450 r / min for 10-15 min.

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