A kind of ferroaluminate cement-based concrete pavement repair material and its preparation method and application

Abstract

The present invention relates to the technical field of cement-based pavement repair materials, and specifically discloses a ferroaluminate cement-based concrete pavement repair material, its preparation method, and application. The raw materials of the repair material include the following components: 25-45 parts by weight of ferroaluminate cement clinker, 2-5 parts by weight of Portland cement clinker, 5-15 parts by weight of composite gypsum, 2-4 parts by weight of calcium sulfosilicate, 2-4 parts by weight of vaterite, 10-25 parts by weight of mineral powder, 40-50 parts by weight of fine aggregate, 0.05-0.25 parts by weight of triisopropanolamine or diethanol monoisopropanolamine, 0.75-1.5 parts by weight of calcium formate, and 0.5-1.0 parts by weight of sulfate. The present invention can improve the strength of the repair material over the entire age range, improve poor freeze-thaw resistance, and provide good bonding strength to the pavement.

Description

Technical Field

[0001] The present invention relates to the technical field of cement-based pavement repair materials, and in particular to a ferroaluminate cement-based concrete pavement repair material, a preparation method thereof, and an application thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] With the continuous development of my country's transportation industry, a large number of highways have been built, and the area of ​​cement concrete pavement has continued to increase. Due to climate change and the impact of vehicle loads, cement concrete pavements are prone to problems such as polishing, flaking, and cracking. These problems seriously affect the appearance of roads and transportation. Therefore, repairing cement concrete pavements is extremely necessary.

[0004] Traditional sulfoaluminate cement-based concrete pavement repair materials suffer from poor wear resistance, poor carbonation resistance, and low bonding strength, significantly reducing the service life of concrete pavement repair materials. Although ferroaluminate cement-based pavement repair materials can address these issues, the increased solubility of Fe2O3 in ferroaluminate cement in the calcium sulfoaluminate and calcium aluminoferrite mineral phases leads to reduced mineral hydration activity and degree of hydration, resulting in lower early, mid-, and late-stage strength of such repair materials and decreased frost resistance. Furthermore, these repair materials also suffer from insufficient bonding strength with the existing interface of the repaired area, which can easily cause the repair material to fall off during service, leading to repair failure. Summary of the Invention

[0005] To address the above-mentioned issues, the present invention provides a ferroaluminate cement-based concrete pavement repair material, its preparation method, and its application. This material can improve the strength of the repair material over its entire lifespan, improve poor freeze-thaw resistance, and provide excellent bonding strength at the interface with the existing surface of the repaired area, thereby extending the service life of the repaired area. Specifically, the technical solution of the present invention is as follows.

[0006] First, the present invention discloses a ferroaluminate cement-based concrete pavement repair material, the raw materials of which include the following components: 25-45 parts by weight of ferroaluminate cement clinker, 2-5 parts by weight of Portland cement clinker, 5-15 parts by weight of composite gypsum, 2-4 parts by weight of calcium sulfosilicate, 2-4 parts by weight of vaterite, 10-25 parts by weight of mineral powder, 40-50 parts by weight of fine aggregate, 0.05-0.25 parts by weight of triisopropanolamine or diethanol monoisopropanolamine, 0.75-1.5 parts by weight of calcium formate, and 0.5-1.0 parts by weight of sulfate.

[0007] Furthermore, the raw materials also include 15 to 31 parts by weight of mixing water.

[0008] Furthermore, the sulfate includes at least one of sodium sulfate, potassium sulfate, aluminum sulfate, barium sulfate, etc.

[0009] Furthermore, the composite gypsum is formed by mixing dihydrate gypsum and anhydrite. Optionally, the mass ratio of the dihydrate gypsum to the anhydrite is 5-7:3-5.

[0010] Furthermore, the mineral powder is graded from powders having finenesses of 400-500 mesh, 500-600 mesh, 600-700 mesh, and 700-800 mesh. Optionally, the mass ratios of the powders having finenesses of 400-500 mesh, 500-600 mesh, 600-700 mesh, and 700-800 mesh are, in order, 45-55:20-25:15-20:5-10.

[0011] Furthermore, the calcium sulfoaluminate of the ferroaluminate cement (C4A 3-x F x $) The solid solubility x of iron in is: 0.4≤x≤0.9.

[0012] Furthermore, the calcium aluminoferrite (C2A 1-y F y ) The solid solubility y of iron in it is: 0.5≤y≤0.7.

[0013] Furthermore, the fine aggregate includes at least one of river sand, machine-made sand, quartz sand, etc.

[0014] Secondly, the present invention discloses a preparation method of the ferroaluminate cement-based concrete pavement repair material, comprising the following steps: mixing the ferroaluminate cement clinker, silicate cement clinker, composite gypsum, calcium sulfosilicate, vaterite, mineral powder, fine aggregate, triisopropanolamine or diethanol monoisopropanolamine, calcium formate, and sulfate, stirring evenly, and then adding the mixing water and stirring evenly to obtain the repair material.

[0015] Finally, the present invention discloses the application of the ferroaluminate cement-based concrete pavement repair material in construction engineering, road engineering or bridge engineering.

[0016] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0017] (1) Triisopropanolamine or diethanol monoisopropanolamine is added to the repair material of the present invention, which can effectively promote the dissolution of the mineral phase in the ferroaluminate cement clinker and react with the Fe in calcium ferroaluminate and calcium ferroaluminate. 3+The formation of complex accelerates the dissolution of the composite gypsum, thereby accelerating the hydration of ferroaluminate cement clinker and significantly enhancing the early strength of the repair material. At the same time, the disordered migration of the complex in the liquid phase increases the internal activation energy, making the hydration reaction easier to proceed, thereby promoting the generation of hydration products, making their distribution more uniform, and making the system more dense. In addition, in the Fe 3+ The tetrahedron formed after complexation replaces part of the Q in CSH gel b 2 Si tetrahedrons form C-(F)-SH gel, which makes the structure of the repair material denser, thereby improving the mechanical strength of the repair material throughout the entire age period.

[0018] (2) The formate ions released by the calcium formate can penetrate the hydration product (CSH gel layer) covering the surface of the C2S grains in the ordinary Portland cement clinker, accelerating the dissolution of C2S. However, since the ferroaluminate cement clinker generates C-(F)-SH gel, and the tetrahedrons generated by the complexation replace part of the Q b 2 Si tetrahedron makes C-(F)-SH gel more active, and the penetration resistance of formate ions becomes extremely small, which greatly accelerates the hydration of C2S and the speed of generating CSH gel, making the structure of the repair material denser and enhancing the early and late strength of the repair material.

[0019] (3) The calcium formate and sulfate in the repair material of the present invention can synergistically promote the hydration of mineral powder. This is because the sulfate dissolves in the hydration liquid phase to make SO4 2- The content increases, promoting the hydration process and consuming Ca 2+ , accelerate the dissolution of mineral powder to provide Ca 2+ At this time, calcium formate accelerates the Ca 2+ The formation of Ca(OH)2 and CSH gel causes the mineral powder to rapidly hydrate and generate a large amount of CSH gel, thereby reducing the porosity of the repair material, making the structure denser, and significantly reducing the entry of carbon dioxide in the air and external moisture, thereby improving the anti-carbonization and anti-freeze properties of the repair material.

[0020] (4) The triisopropanolamine or diethanol monoisopropanolamine and calcium formate in the repair material of the present invention can synergistically dissolve the old concrete surface at the repair site of the concrete pavement to a certain extent. This is because the calcium formate penetrates the hydration product layer on the old concrete surface, allowing the triisopropanolamine or diethanol monoisopropanolamine to contact and wrap the unhydrated silicate minerals, causing them to dissolve again. This helps the repair material penetrate into the old concrete and undergo a hydration reaction to form a cementitious product, thereby promoting the bonding between the new and old interfaces, enhancing the bonding performance between the repair material and the concrete pavement, and preventing problems such as cracking at the interface causing the repair material to fall off.

[0021] (5) The calcium sulfosilicate and vaterite in the repair material of the present invention can react with Al(OH)3 and Fe(OH)3 generated by the hydration of the ferroaluminate cement clinker to form iron-containing calcium vanadium, which further increases the strength. This is because the vaterite can quickly dissolve and provide Ca 2+ To promote the dissolution of calcium sulfosilicate, which dissolves to produce Ca 2+ 、SO4 2- and SiO4 4- The Al(OH)3 and Fe(OH)3 generated by the hydration of the ferroaluminate cement clinker react with the above-mentioned ions to produce iron-containing ettringite, making these ions in the hydration liquid phase in an unsaturated state, thereby increasing the dissolution driving force of C5S2$, accelerating the hydration of C5S2$ to generate iron-containing ettringite and CSH gel, and further improving the strength of the repair material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 This is a sample of the ferroaluminate cement-based concrete pavement repair material prepared in the following Example 1.

[0024] Figure 2 This is a 28d compressive strength test chart of the repair material prepared in the following Example 1.

[0025] Figure 3 The following is a graph showing the bonding strength test of the repaired specimen in Example 1. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the invention. The experimental methods in the following examples, for which specific conditions are not specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0027] Unless otherwise defined, all professional and scientific terms used in the present invention have the same meanings as those familiar to those skilled in the art. The reagents and raw materials used in the present invention can be purchased through conventional channels. Unless otherwise specified, the reagents and raw materials used in the present invention are used in accordance with conventional methods in the art or in accordance with the product instructions.

[0028] In addition, any methods and materials similar or equivalent to those described herein can be applied to the method of the present invention. The technical solution of the present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] A method for preparing a ferroaluminate cement-based concrete pavement repair material comprises the following steps:

[0031] (1) Weigh the raw materials in the following proportions: 25 parts by weight of ferroaluminate cement clinker, 2 parts by weight of 42.5 ordinary Portland cement clinker, 5 parts by weight of composite gypsum with a fineness of 200 mesh, 2 parts by weight of calcium sulfosilicate powder with a fineness of 300 mesh, 2 parts by weight of vaterite powder with a fineness of 300 mesh, 10 parts by weight of mineral powder, 44 parts by weight of river sand fine aggregate, 0.05 parts by weight of triisopropanolamine, 1.3 parts by weight of calcium formate, and 0.5 parts by weight of sodium sulfate. 2.5 F 0.5 $、Calcium aluminoferrite is C2A 0.4 F 0.6 The composite gypsum is prepared by mixing dihydrate gypsum and anhydrite in a mass ratio of 6:4, the fine aggregate is medium sand, and the mineral powder is prepared by mixing 50 parts by weight of 400-mesh mineral powder, 25 parts by weight of 500-mesh mineral powder, 15 parts by weight of 600-mesh mineral powder, and 10 parts by weight of 700-mesh mineral powder.

[0032] (2) Add the raw materials of step (1) into a blender and stir for 3 minutes, then add the obtained powder (such as Figure 1 15 parts by weight of mixing water was added to the mixture and stirred for 2 minutes to obtain a repair material.

[0033] Performance test: (1) According to GBT 17671-2021, the 2h compressive strength and 28d compressive strength of the repair material prepared in this embodiment (such as Figure 2 (2) The old concrete substrate is placed in a mold, and then the repair material prepared in this embodiment is poured into the gap of the mold. Then, the bonding strength of the repaired specimen obtained by testing according to GBT 17671-2021 (as shown) is Figure 3(as shown) to measure the bonding performance between the repair material and the old concrete. (3) The wear resistance of the repair material prepared in this embodiment was tested according to T0567-2005 "Test method for wear resistance of cement concrete". (4) The frost resistance (strength loss after 100 freeze-thaw cycles) of the repair material prepared in this embodiment was tested according to "GB∕T 50082-2009". The test results of the above performance indicators are shown in the following table:

[0034] .

[0035] Example 2

[0036] A method for preparing a ferroaluminate cement-based concrete pavement repair material comprises the following steps:

[0037] (1) Weigh the raw materials in the following proportions: 32 parts by weight of ferroaluminate cement clinker, 3 parts by weight of 42.5 ordinary Portland cement clinker, 10 parts by weight of composite gypsum with a fineness of 200 mesh, 4 parts by weight of calcium sulfosilicate powder with a fineness of 300 mesh, 4 parts by weight of vaterite powder with a fineness of 300 mesh, 17 parts by weight of mineral powder, 40 parts by weight of river sand fine aggregate, 0.25 parts by weight of triisopropanolamine, 1.5 parts by weight of calcium formate, and 0.5 parts by weight of potassium sulfate. 2.6 F 0.4 $、Calcium aluminoferrite is C2A 0.5 F 0.5 The composite gypsum is prepared by mixing dihydrate gypsum and anhydrite in a mass ratio of 5:5, the fine aggregate is medium sand, and the mineral powder is prepared by mixing 55 parts by weight of 400-mesh mineral powder, 23 parts by weight of 500-mesh mineral powder, 20 parts by weight of 600-mesh mineral powder, and 10 parts by weight of 700-mesh mineral powder.

[0038] (2) Add the raw materials of step (1) into a blender and stir for 3 minutes. Then, add 25 parts by weight of mixing water to the obtained powder and stir for 2 minutes to obtain a repair material.

[0039] Performance Testing: The same methods as in Example 1 were used to test the 2h compressive strength, 28d compressive strength, bond strength with old concrete, wear resistance, and frost resistance of the patching material prepared in this example. The test results for each of the above performance indicators are shown in the following table:

[0040] .

[0041] Example 3

[0042] A method for preparing a ferroaluminate cement-based concrete pavement repair material comprises the following steps:

[0043] (1) Weigh the raw materials in the following proportions: 45 parts by weight of ferroaluminate cement clinker, 5 parts by weight of 42.5 ordinary Portland cement clinker, 15 parts by weight of composite gypsum with a fineness of 200 mesh, 3 parts by weight of calcium sulfosilicate powder with a fineness of 200 mesh, 3.5 parts by weight of vaterite powder with a fineness of 300 mesh, 25 parts by weight of mineral powder, 50 parts by weight of quartz sand fine aggregate, 0.25 parts by weight of diethanol monoisopropanolamine, 0.75 parts by weight of calcium formate, and 1.0 parts by weight of barium sulfate. 2.1 F 0.9 $、Calcium aluminoferrite is C2A 0.7 F 0.7 The composite gypsum is prepared by mixing dihydrate gypsum and anhydrite in a mass ratio of 7:3, the fine aggregate is medium sand, and the mineral powder is prepared by mixing 45 parts by weight of 500-mesh mineral powder, 20 parts by weight of 600-mesh mineral powder, 18 parts by weight of 700-mesh mineral powder, and 5 parts by weight of 800-mesh mineral powder.

[0044] (2) The raw materials of step (1) were added to a blender and stirred for 3 minutes. Then, 31 parts by weight of mixing water were added to the obtained powder and stirred for 2 minutes to obtain a repair material.

[0045] Performance Testing: The same methods as in Example 1 were used to test the 2h compressive strength, 28d compressive strength, bond strength with old concrete, wear resistance, and frost resistance of the patching material prepared in this example. The test results for each of the above performance indicators are shown in the following table:

[0046] .

[0047] Example 4

[0048] A method for preparing a ferroaluminate cement-based concrete pavement repair material comprises the following steps:

[0049] (1) Weigh the raw materials in the following proportions: 25 parts by weight of ferroaluminate cement clinker, 2 parts by weight of 42.5 ordinary Portland cement clinker, 5 parts by weight of composite gypsum with a fineness of 200 mesh, 2 parts by weight of calcium sulfosilicate powder with a fineness of 300 mesh, 2 parts by weight of vaterite powder with a fineness of 300 mesh, 10 parts by weight of mineral powder, 44 parts by weight of river sand fine aggregate, 1.3 parts by weight of calcium formate, and 0.5 parts by weight of sodium sulfate. 2.5 F 0.5 $、Calcium aluminoferrite is C2A 0.4 F 0.6The composite gypsum is prepared by mixing dihydrate gypsum and anhydrite in a mass ratio of 6:4, the fine aggregate is medium sand, and the mineral powder is prepared by mixing 50 parts by weight of 400-mesh mineral powder, 25 parts by weight of 500-mesh mineral powder, 15 parts by weight of 600-mesh mineral powder, and 10 parts by weight of 700-mesh mineral powder.

[0050] (2) The raw materials of step (1) were added to a blender and stirred for 3 minutes. Then, 15 parts by weight of mixing water was added to the obtained powder and stirred for 2 minutes to obtain a repair material.

[0051] Performance Testing: The same methods as in Example 1 were used to test the 2h compressive strength, 28d compressive strength, bond strength with old concrete, wear resistance, and frost resistance of the patching material prepared in this example. The test results for each of the above performance indicators are shown in the following table:

[0052] .

[0053] Example 5

[0054] A method for preparing a ferroaluminate cement-based concrete pavement repair material comprises the following steps:

[0055] (1) Weigh the raw materials in the following proportions: 32 parts by weight of ferroaluminate cement clinker, 3 parts by weight of 42.5 ordinary Portland cement clinker, 10 parts by weight of composite gypsum with a fineness of 200 mesh, 4 parts by weight of calcium sulfosilicate powder with a fineness of 300 mesh, 4 parts by weight of vaterite powder with a fineness of 300 mesh, 17 parts by weight of mineral powder, 40 parts by weight of river sand fine aggregate, and 0.25 parts by weight of triisopropanolamine. 2.6 F 0.4 $、Calcium aluminoferrite is C2A 0.5 F 0.5 The composite gypsum is prepared by mixing dihydrate gypsum and anhydrite in a mass ratio of 5:5, the fine aggregate is medium sand, and the mineral powder is prepared by mixing 55 parts by weight of 400-mesh mineral powder, 23 parts by weight of 500-mesh mineral powder, 20 parts by weight of 600-mesh mineral powder, and 10 parts by weight of 700-mesh mineral powder.

[0056] (2) Add the raw materials of step (1) into a blender and stir for 3 minutes. Then, add 25 parts by weight of mixing water to the obtained powder and stir for 2 minutes to obtain a repair material.

[0057] Performance Testing: The same methods as in Example 1 were used to test the 2h compressive strength, 28d compressive strength, bond strength with old concrete, wear resistance, and frost resistance of the patching material prepared in this example. The test results for each of the above performance indicators are shown in the following table:

[0058] .

[0059] Example 6

[0060] A method for preparing a ferroaluminate cement-based concrete pavement repair material comprises the following steps:

[0061] (1) Weigh the raw materials in the following proportions: 45 parts by weight of ferroaluminate cement clinker, 5 parts by weight of 42.5 ordinary Portland cement clinker, 15 parts by weight of composite gypsum with a fineness of 200 mesh, 3 parts by weight of calcium sulfosilicate powder with a fineness of 200 mesh, 3.5 parts by weight of vaterite powder with a fineness of 300 mesh, 25 parts by weight of mineral powder, 50 parts by weight of quartz sand fine aggregate, and 1.0 part by weight of barium sulfate. 2.1 F 0.9 $、Calcium aluminoferrite is C2A 0.7 F 0.7 The composite gypsum is prepared by mixing dihydrate gypsum and anhydrite in a mass ratio of 7:3, the fine aggregate is medium sand, and the mineral powder is prepared by mixing 45 parts by weight of 500-mesh mineral powder, 20 parts by weight of 600-mesh mineral powder, 18 parts by weight of 700-mesh mineral powder, and 5 parts by weight of 800-mesh mineral powder.

[0062] (2) The raw materials of step (1) were added to a blender and stirred for 3 minutes. Then, 31 parts by weight of mixing water were added to the obtained powder and stirred for 2 minutes to obtain a repair material.

[0063] Performance Testing: The same methods as in Example 1 were used to test the 2h compressive strength, 28d compressive strength, bond strength with old concrete, wear resistance, and frost resistance of the patching material prepared in this example. The test results for each of the above performance indicators are shown in the following table:

[0064] .

[0065] Example 7

[0066] A method for preparing a ferroaluminate cement-based concrete pavement repair material comprises the following steps:

[0067] (1) Weigh the raw materials in the following proportions: 32 parts by weight of ferroaluminate cement clinker, 3 parts by weight of 42.5 ordinary Portland cement clinker, 10 parts by weight of dihydrate gypsum with a fineness of 200 mesh, 4 parts by weight of calcium sulfosilicate powder with a fineness of 300 mesh, 4 parts by weight of vaterite powder with a fineness of 300 mesh, 17 parts by weight of mineral powder, 40 parts by weight of river sand fine aggregate, 0.25 parts by weight of triisopropanolamine, 1.5 parts by weight of calcium formate, and 0.5 parts by weight of potassium sulfate. 2.6 F 0.4$、Calcium aluminoferrite is C2A 0.5 F 0.5 The fine aggregate is medium sand, and the mineral powder is a mixture of 55 parts by weight of 400-mesh mineral powder, 23 parts by weight of 500-mesh mineral powder, 20 parts by weight of 600-mesh mineral powder, and 10 parts by weight of 700-mesh mineral powder.

[0068] (2) Add the raw materials of step (1) into a blender and stir for 3 minutes. Then, add 25 parts by weight of mixing water to the obtained powder and stir for 2 minutes to obtain a repair material.

[0069] Performance Testing: The same methods as in Example 1 were used to test the 2h compressive strength, 28d compressive strength, bond strength with old concrete, wear resistance, and frost resistance (strength loss after 100 freeze-thaw cycles) of the patch material prepared in this example. The test results for these performance indicators are shown in the following table:

[0070] .

[0071] Example 8

[0072] A method for preparing a ferroaluminate cement-based concrete pavement repair material comprises the following steps:

[0073] (1) Weigh the raw materials in the following proportions: 45 parts by weight of ferroaluminate cement clinker, 5 parts by weight of 42.5 ordinary Portland cement clinker, 15 parts by weight of 200-mesh composite gypsum, 25 parts by weight of mineral powder, 50 parts by weight of quartz sand fine aggregate, 0.25 parts by weight of diethanol monoisopropanolamine, 0.75 parts by weight of calcium formate, and 1.0 parts by weight of barium sulfate. 2.1 F 0.9 $、Calcium aluminoferrite is C2A 0.7 F 0.7 The composite gypsum is prepared by mixing dihydrate gypsum and anhydrite in a mass ratio of 7:3, the fine aggregate is medium sand, and the mineral powder is prepared by mixing 45 parts by weight of 500-mesh mineral powder, 20 parts by weight of 600-mesh mineral powder, 18 parts by weight of 700-mesh mineral powder, and 5 parts by weight of 800-mesh mineral powder.

[0074] (2) The raw materials of step (1) were added to a blender and stirred for 3 minutes. Then, 31 parts by weight of mixing water were added to the obtained powder and stirred for 2 minutes to obtain a repair material.

[0075] Performance Testing: The same methods as in Example 1 were used to test the 2h compressive strength, 28d compressive strength, bond strength with old concrete, wear resistance, and frost resistance of the patching material prepared in this example. The test results for each of the above performance indicators are shown in the following table:

[0076] .

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A ferroaluminate cement-based concrete pavement repair material, characterized in that: The raw materials of the repair material include the following components: 25-45 parts by weight of ferroaluminate cement clinker, 2-5 parts by weight of silicate cement clinker, 5-15 parts by weight of composite gypsum, 2-4 parts by weight of calcium sulfosilicate, 2-4 parts by weight of vaterite, 10-25 parts by weight of mineral powder, 40-50 parts by weight of fine aggregate, 0.05-0.25 parts by weight of diethanol monoisopropanolamine, 0.75-1.5 parts by weight of calcium formate, and 0.5-1.0 parts by weight of sulfate.

2. The ferroaluminate cement-based concrete pavement repair material according to claim 1, characterized in that: The raw materials also include 15 to 31 parts by weight of mixing water.

3. The ferroaluminate cement-based concrete pavement repair material according to claim 1, characterized in that: The sulfate includes at least one of sodium sulfate, potassium sulfate, aluminum sulfate, and barium sulfate.

4. The ferroaluminate cement-based concrete pavement repair material according to claim 1, characterized in that: The composite gypsum is prepared by mixing dihydrate gypsum and anhydrite; the mass ratio of the dihydrate gypsum to the anhydrite is 5-7:3-5.

5. The ferroaluminate cement-based concrete pavement repair material according to claim 1, characterized in that: The mineral powder is graded from powders with finenesses of 400-500 mesh, 500-600 mesh, 600-700 mesh, and 700-800 mesh; the mass ratios of the powders of 400-500 mesh, 500-600 mesh, 600-700 mesh, and 700-800 mesh are 45-55:20-25:15-20:5-10, respectively.

6. The ferroaluminate cement-based concrete pavement repair material according to claim 1, characterized in that: C4A of the ferroaluminate cement 3-x F x $The solid solubility x of iron in the medium is: 0.4≤x≤0.

9.

7. The ferroaluminate cement-based concrete pavement repair material according to claim 1, characterized in that: C2A of the ferroaluminate cement 1-y F y The solid solution content y of iron is: 0.5≤y≤0.

7.

8. The ferroaluminate cement-based concrete pavement repair material according to any one of claims 1 to 7, characterized in that: The fine aggregate includes at least one of river sand, machine-made sand, and quartz sand.

9. The method for preparing the ferroaluminate cement-based concrete pavement repair material according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: mixing the ferroaluminate cement clinker, silicate cement clinker, composite gypsum, calcium sulfosilicate, vaterite, mineral powder, fine aggregate, triisopropanolamine or diethanol monoisopropanolamine, calcium formate and sulfate, stirring evenly, then adding mixing water and stirring evenly to obtain the repair material.

10. Use of the ferroaluminate cement-based concrete pavement repair material according to any one of claims 1 to 7 in construction engineering, road engineering or bridge engineering.

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