Low-temperature-resistant self-repairing waterproof concrete for water conservancy and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and particularly discloses low-temperature-resistant self-repairing waterproof concrete for water conservancy and a preparation method of the low-temperature-resistant self-repairing waterproof concrete. The water conservancy low-temperature-resistant self-repairing waterproof concrete is specifically prepared from the following components in parts by weight: 70 to 80 parts of cement, 10 to 20 parts of fly ash, 8 to 12 parts of silica fume, 2.5 to 3.5 parts of a reinforcing material, 0.2 to 0.4 part of a crystallization inducer, 1.5 to 2.5 parts of a repairing agent and 20 to 40 parts of water, the reinforcing material is formed by mixing nano silica sol, bentonite, quartz sand and triethanolamine; the crystallization inducer is formed by mixing sodium silicate and aluminum hypophosphite; the repairing agent is obtained by loading calcium ions on an amino silane modified zeolite material and then mixing with a bacillus pasteurii bacterial solution. By utilizing the technical scheme provided by the invention, the prepared concrete has excellent mechanical properties, water resistance, impermeability, freezing resistance, crack resistance and good durability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete, and particularly relates to a water conservancy low-temperature-resistant self-repairing waterproof concrete and a preparation method thereof. BACKGROUND

[0002] At present, the concrete materials used in current marine engineering are tested by seawater erosion, freeze-thaw cycle and other harsh conditions, and the traditional waterproof treatment method is difficult to be durable and effective. With the progress of material science, the internal mixing type self-repairing material has become a research hotspot for improving the durability of concrete structure, but the existing materials have poor performance in low temperature environment.

[0003] The existing self-repairing concrete material has low repair efficiency, limited waterproof effect and insufficient long-term durability under cold or extremely low temperature conditions.

[0004] With the continuous development of marine engineering, it is an urgent need to develop high-performance self-repairing materials that can adapt to harsh environments. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a water conservancy low-temperature-resistant self-repairing waterproof concrete and a preparation method thereof.

[0006] In one aspect, the present application provides a water conservancy low-temperature-resistant self-repairing waterproof concrete, which specifically comprises the following components by weight: cement 70-80 parts, fly ash 10-20 parts, silica fume 8-12 parts, reinforcing material 2.5-3.5 parts, crystallization inducer 0.2-0.4 parts, repair agent 1.5-2.5 parts, and water 20-40 parts. The reinforcing material is composed of nano-silica sol, bentonite, quartz sand and triethanolamine with a weight ratio of 2-5:3-6:5-15:0.1-0.3. The crystallization inducer is composed of sodium silicate and aluminum hypophosphite with a weight ratio of 1-3:0.5-2. The repair agent is obtained by mixing the calcium ion loaded zeolite material modified by aminosilane and the bacillus pasteurii bacterial solution.

[0007] In the reinforcing material provided by the present application, the active silicon dioxide in the nano-silica sol can effectively fill the micropores, promote the generation of C-S-H gel, improve the compactness, and thus improve the compressive strength and waterproof and impermeability. The bentonite has the performance of water absorption and expansion to compensate for shrinkage, thereby effectively reducing the 28d shrinkage value, but excessive bentonite will reduce the strength, so the dosage needs to be controlled. The quartz sand has an inert skeleton, which can stabilize the volume and reduce the shrinkage. The triethanolamine has the performance of improving the early strength and frost resistance of concrete, can accelerate the hydration of calcium, and improve the early strength, but the dosage needs to be limited to prevent the late strength from being reversed.

[0008] The crystallization inducer provided in the application can promote the dissolution of silicate phase in cement, accelerate the formation of C-S-H gel, and improve the early strength, and can also induce crystallization: react with calcium ions to generate calcium silicate hydrate (C-S-H) to fill pores and reduce permeability; and can also control shrinkage: the optimal dosage can reduce drying shrinkage (excessive dosage will increase shrinkage due to alkali-aggregate reaction). Aluminum hypophosphite can prevent rust and densify the concrete, and the decomposition products, chloride ions and phosphate ions, can participate in hydration to form a dense calcium aluminum phosphate phase to block capillary pores; the optimized microporous structure can buffer frost heaving stress, reduce the strength loss rate during freeze-thaw cycles, and improve the frost resistance of the concrete.

[0009] The repair agent provided in the application can effectively enhance the interfacial bonding of calcium ions, bacteria and cement matrix on the surface of the amino silane modified zeolite. The repair agent can enable the amino silane to enhance the chemical bonding of the zeolite and the cement, strengthen the force between the zeolite-cement interface, densify the pores of the concrete system by calcium carbonate precipitation, and improve the compressive strength of the concrete. The repair agent has internal curing effect: the zeolite pores slowly release water to reduce self-drying shrinkage; the generation of calcium carbonate precipitation is accompanied by local volume expansion, which has an expansion compensation effect. At the same time, the repair agent can further enhance the mineralization pore blocking effect to reduce permeability. In addition, the generated calcium carbonate precipitation and the zeolite form a multi-level pore structure (macro-micro-nanopore), provide micropore buffering, disperse frost heaving stress, reduce the strength loss rate during freeze-thaw cycles, and improve the frost resistance of the concrete.

[0010] The enhanced material, the crystallization inducer and the repair agent prepared by adopting the technical solutions described above are combined with cement, fly ash and silica fume in specific amounts to prepare concrete with excellent mechanical properties, waterproof and impermeability, and frost and crack resistance, and good durability.

[0011] Preferably, the water conservancy low-temperature self-repairing waterproof concrete specifically comprises the following components in parts by weight: cement 72-78 parts, fly ash 12-18 parts, silica fume 9-11 parts, enhanced material 2.8-3.2 parts, crystallization inducer 0.25-0.35 parts, repair agent 1.7-2.2 parts, and water 25-35 parts.

[0012] Preferably, the enhanced material is composed of nano-silica sol, bentonite, quartz sand and triethanolamine in a weight ratio of 3-4:4-5:7-12:0.15-0.25.

[0013] In one specific implementation, the weight ratio of nano-silica sol, bentonite, quartz sand, and triethanolamine in the reinforcing material can be 2:3:5:0.1, 3:4:7:0.15, 3.5:4.5:9:0.2, 4:5:12:0.25, or 5:6:15:0.3.

[0014] Experimental analysis shows that the reinforcing material composed of nano-silica sol, bentonite, quartz sand and triethanolamine in the above weight ratio can further improve the performance of concrete.

[0015] Preferably, in the reinforcing material, the preparation method of the nano-silica sol is as follows: nano-SiO2 and 0.2-0.5wt% sodium dodecyl sulfate aqueous solution are mixed at a weight ratio of 1:4-6, and ultrasonicated for 30-60 min to obtain nano-silica sol; The bentonite has a particle size of 180-325 mesh and a density of 1.0-1.2 g / cm³. 3 ; The quartz sand has a particle size of 0.5-1 mm and a density of 2.5-2.8 g / cm³. 3 .

[0016] Preferably, the crystallization inducer is composed of sodium silicate and aluminum hypophosphite in a weight ratio of 1.5-2.5:1-1.8.

[0017] In one specific implementation, the weight ratio of sodium silicate to aluminum hypophosphite in the crystallization inducer can be 1:0.5, 1:1, 1:1.5, 1:1.8, or 1:2.

[0018] Experimental analysis shows that the crystallization inducing agent composed of sodium silicate and aluminum hypophosphite in the above weight ratio can further improve the performance of concrete.

[0019] Preferably, the preparation method of the repair agent is as follows: under the condition of 30-45℃, 20-26 parts by weight of zeolite are dispersed in 100 parts by weight of 0.3-0.6 wt% aminosilane-ethanol solution and stirred for 1-3 h; then CaCl2 is added to a final concentration of 1-3 wt% and stirred for 4-8 h; then bacteria with a concentration of 3-7 × 10⁻⁶ are added. 7 The final concentration of Bacillus pasteurellium culture was 0.02-0.06 wt% (cell / mL), and the mixture was stirred for 7-14 hours to obtain the repair agent.

[0020] Preferably, the preparation method of the repair agent is: dispersing 22-24 parts by weight of zeolite in 100 parts by weight of 0.4-0.5wt% of amino silane-ethanol solution at a temperature of 35-40℃, stirring for 1.5-2.5h; then adding CaCl2 to a final concentration of 1.5-2.5wt%, stirring for 5-7h; then adding a bacterial solution of Paenibacillus polymyxa with a concentration of 4-6×10 7 cells / mL to a final concentration of 0.03-0.05wt%, stirring for 9-12h, to obtain the repair agent.

[0021] Preferably, the amino silane is selected from one or more of γ-aminopropyl triethoxysilane, N-β(aminoethyl)-γ-aminopropyl trimethoxysilane, N-β(aminoethyl)-γ-aminopropyl methyl dimethoxysilane, phenylaminomethyl triethoxysilane, phenylaminomethyl trimethoxysilane, aminoethyl aminoethyl aminopropyl trimethoxysilane, polyaminoalkyl trialkoxysilane.

[0022] Preferably, the fly ash is F-class I-grade, with a density of 2200-2400kg / m 3 ; and the silica ash is silicon powder, with a specific surface area of 28±3m 2 / g.

[0023] In another aspect, the application provides a preparation method of the above-mentioned water conservancy low-temperature self-repairing waterproof concrete, which specifically comprises sequentially performing the following steps: Respectively weighing the corresponding weight of each raw material component; respectively adding cement, fly ash, silica ash and reinforcing material into water and stirring uniformly; then adding a crystallization inducer and a repair agent and mixing and stirring; after the mixing is completed, curing is performed, and the water conservancy low-temperature self-repairing waterproof concrete is obtained.

[0024] In summary, the technical scheme of the application has the following effects: The application uses a specific weight ratio of nano-silica sol, bentonite, quartz sand and triethanolamine to mix and form a reinforcing material, uses a specific weight ratio of sodium silicate and aluminum hypophosphite to mix and form a crystallization inducer, and uses an amino silane modified zeolite material to load calcium ions, and then mixes the repair agent with a bacterial solution of Paenibacillus polymyxa to obtain the repair agent. Then, the reinforcing material, the crystallization inducer and the repair agent prepared by the above technical scheme are combined with cement, fly ash and silica ash in a specific amount to prepare the concrete, which has excellent mechanical properties, waterproof and impermeability and frost resistance and cracking resistance, and good durability. DETAILED DESCRIPTION

[0025] The application will be further described in detail below in combination with examples, comparative examples and performance test experiments, and these examples cannot be understood as limiting the scope of the application.

[0026] The cement used in the embodiments of the application is P·O 42.5 cement; the fly ash is F-class I-grade, and the density is 2300 kg / m 3 ; the silica ash is silica powder, and the specific surface area is 28 m 2 / g. The bentonite (model YD-223) and the quartz sand (model YD-31) are purchased from Tianjin Yandong Mining Products Co., Ltd.; the particle size of the zeolite is 1-3 mm.

[0027] Embodiments

[0028] Embodiments 1-5 Embodiments 1-5 respectively provide a water conservancy low-temperature-resistant self-repairing waterproof concrete and a preparation method thereof.

[0029] The difference between the above embodiments is that the amount of each component in the concrete is different, and the specific amount is shown in Table 1.

[0030] The preparation method of the concrete in the above embodiments is as follows: Preparation of the repair agent: 15.0 g of casein peptone, 5.0 g of soybean peptone, 5.0 g of sodium chloride, 20.0 g of agar, and 20.0 g of urea are added to 1 L of ultrapure water, the pH value is adjusted to 7.3, sterilized at 121 ℃ for 30 min and cooled to room temperature, to prepare a Bacillus pasteurii culture medium, then inoculated with Bacillus pasteurii, and incubated at 33 ℃ for 24 h at a rotation speed of 130 r / min, to obtain a bacterial solution; the bacterial solution is diluted to 5×10 7 cells / mL with normal saline, to obtain a Bacillus pasteurii bacterial solution.

[0031] 23 g of zeolite is dispersed in 100 g of 0.45 wt% γ-aminopropyl triethoxysilane-ethanol solution at a temperature of 37 ℃, stirred for 2 h; then CaCl2 is added to a final concentration of 2 wt%, stirred for 6 h; then Bacillus pasteurii bacterial solution with a bacterial concentration of 5×10 7 cells / mL is added to a final concentration of 0.04 wt%, stirred for 11 h, to obtain the repair agent; and stored at 25 ℃ for use.

[0032] The preparation method of the nano-silica sol is as follows: nano-SiO2 and 0.35 wt% sodium dodecyl sulfate aqueous solution are mixed in a weight ratio of 1:5, ultrasonically treated for 45 min, to obtain the nano-silica sol.

[0033] According to Table 1, the corresponding weight of each raw material component is weighed respectively; cement, fly ash, silica fume, reinforcing material (composed of nano-silica sol, bentonite, quartz sand, triethanolamine in a weight ratio of 3.5:4.5:9:0.2) are added to water and stirred uniformly; then the crystallization inducer (composed of sodium silicate, aluminum hypophosphite in a weight ratio of 2:1.4) and the repairing agent are mixed and stirred; after the mixing is completed, it is poured and formed, and after curing, the water conservancy low-temperature self-repairing waterproof concrete is obtained.

[0034] Table 1: Amount of each component in the concrete of Examples 1-5

[0035] Examples 6-9 Examples 6-9 respectively provide a water conservancy low-temperature self-repairing waterproof concrete and a preparation method thereof.

[0036] The difference between the above examples and Example 1 is that the composition of the reinforcing material or the crystallization inducer is different, which is specifically as follows.

[0037] In Example 6: the reinforcing material is composed of nano-silica sol, bentonite, quartz sand, triethanolamine in a weight ratio of 2:6:5:0.3.

[0038] In Example 7: the reinforcing material is composed of nano-silica sol, bentonite, quartz sand, triethanolamine in a weight ratio of 3:5:7:0.25.

[0039] In Example 8: the crystallization inducer is composed of sodium silicate, aluminum hypophosphite in a weight ratio of 3:0.5.

[0040] In Example 9: the crystallization inducer is composed of sodium silicate, aluminum hypophosphite in a weight ratio of 1.5:1.8.

[0041] In the above examples, the other process parameters are the same as those in Example 1.

[0042] Examples 10-13 Examples 10-13 respectively provide a water conservancy low-temperature self-repairing waterproof concrete and a preparation method thereof.

[0043] The difference between the above examples and Example 1 is that the preparation method of the repairing agent is different, which is specifically as follows.

[0044] In Example 10: the preparation method of the repairing agent is: 23g zeolite is dispersed in 100g 0.3wt% γ-aminopropyltriethoxysilane-ethanol solution at a temperature of 37℃, stirring for 2h; then CaCl2 is added to a final concentration of 3wt%, stirring for 6h; then bacteria with a concentration of 5×10 7The Bacillus pasteurellium culture solution was prepared at a final concentration of 0.04 wt% and stirred for 11 h to obtain the repair agent; it was then stored at 25°C for later use.

[0045] In Example 11: The preparation method of the repair agent is as follows: 23g of zeolite is dispersed in 100g of 0.6wt% γ-aminopropyltriethoxysilane-ethanol solution at a temperature of 37℃, and stirred for 2h; then CaCl2 is added to a final concentration of 1wt%, and stirred for 6h; then bacteria with a concentration of 5×10⁻⁶ are added. 7 The Bacillus pasteurellium culture solution was prepared at a final concentration of 0.04 wt% and stirred for 11 h to obtain the repair agent; it was then stored at 25°C for later use.

[0046] In Example 12: The preparation method of the repair agent is as follows: 23g of zeolite is dispersed in 100g of 0.1wt% γ-aminopropyltriethoxysilane-ethanol solution at a temperature of 37℃, and stirred for 2h; then CaCl2 is added to a final concentration of 5wt%, and stirred for 6h; then bacteria with a concentration of 5×10⁻⁶ are added. 7 The Bacillus pasteurellium culture solution was prepared at a final concentration of 0.04 wt% and stirred for 11 h to obtain the repair agent; it was then stored at 25°C for later use.

[0047] In Example 13: The preparation method of the repair agent is as follows: 23g of zeolite is dispersed in 100g of 1.0wt% γ-aminopropyltriethoxysilane-ethanol solution at a temperature of 37℃, and stirred for 2h; then CaCl2 is added to a final concentration of 0.5wt%, and stirred for 6h; then bacteria with a concentration of 5×10⁻⁶ are added. 7 The Bacillus pasteurellium culture solution was prepared at a final concentration of 0.04 wt% and stirred for 11 h to obtain the repair agent; it was then stored at 25°C for later use.

[0048] All other process parameters in the above embodiments are the same as those in Embodiment 1.

[0049] Comparative Example Comparative Examples 1-2 Comparative Examples 1 and 2 respectively provide a type of concrete and a method for its preparation.

[0050] The difference between the above embodiments and Embodiment 1 is that the amount of each component in the concrete is different, as shown in Table 1.

[0051] All other process parameters in the above comparative examples are the same as those in Example 1.

[0052] Comparative Examples 3-5 Comparative Examples 3-5 each provide a type of concrete and a method for its preparation.

[0053] The differences between the above comparative examples and Example 1 are as follows.

[0054] In Comparative Example 3, the reinforcing material was composed of a mixture of nano-silica sol, bentonite, quartz sand, and triethanolamine in a ratio of 7:1:20:1.

[0055] In Comparative Example 4, the crystallization inducer was composed of sodium silicate and aluminum hypophosphite in a weight ratio of 0.5:4.

[0056] In Comparative Example 5: The preparation method of the repair agent was as follows: 23g of zeolite was dispersed in 100g of ethanol solution at a temperature of 37℃ and stirred for 2h; then CaCl2 was added to a final concentration of 2wt% and stirred for 6h; then bacteria with a concentration of 5×10⁻⁶ were added. 7 The Bacillus pasteurellium culture solution was prepared at a final concentration of 0.04 wt% and stirred for 11 h to obtain the repair agent; it was then stored at 25°C for later use.

[0057] All other process parameters in the above comparative examples are the same as those in Example 1.

[0058] Performance testing (1) Compressive strength: The compressive strength of concrete under different temperature conditions was determined according to the provisions of GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" and GB / T 50476-2019 "Standard for Durability Design of Concrete Structures". The low-temperature curing environment was achieved by a low-temperature test chamber with a temperature control accuracy of ±2℃. The concrete was formed 2 hours after water was added and placed in the low-temperature environment for curing for a specific age of 28 days. After curing, it was removed from the mold and then subjected to standard curing. According to the temperature classification conditions and combined with the actual application of seawater, the test temperatures were set at 20℃ (normal temperature) and 5℃ (low temperature).

[0059] (2) Shrinkage performance: According to the provisions of JC / T474-2008, a shrinkage test was conducted to test the 28-day shrinkage value of concrete.

[0060] (3) Impermeability: According to the provisions of JC / T474-2008, after the concrete is cured at normal temperature for 28 days, the permeability height ratio of the concrete is measured.

[0061] (4) Freeze-thaw resistance: According to GB / T 50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete", after the concrete is cured at room temperature for 28 days, the compressive strength loss rate of the concrete (relative to 28 days) is determined after 200 freeze-thaw cycles to evaluate the freeze-thaw resistance of the concrete.

[0062] Test results are shown in Table 2.

[0063] Table 2 Performance test results of concrete in the examples and comparative examples

[0064] As shown in Table 2 above, the concrete prepared using the technical solution provided in this application exhibits high compressive strength, low 28-day shrinkage, and low permeability-to-height ratio under different curing temperatures, while also showing a low freeze-thaw compressive strength loss rate. These results indicate that the concrete prepared in this application possesses excellent mechanical properties, waterproofing and impermeability, freeze-thaw resistance and crack resistance, and good durability.

[0065] By comparing the test results of Examples 1-5 and Comparative Examples 1-2, it can be seen that the dosages of reinforcing materials, crystallization inducing agents, and repairing agents in Comparative Examples 1-2 were mismatched, resulting in concrete with poor performance. In contrast, Examples 1-5 of this application effectively ensured the performance of the concrete by specifically matching the dosages of each raw material component.

[0066] By comparing the test results of Examples 1, 6-7, and Comparative Example 3, it can be seen that the reinforcing material in Comparative Example 3, composed of a mixture of nano-silica sol, bentonite, quartz sand, and triethanolamine in a weight ratio of 7:1:20:1, resulted in concrete with poor performance. In contrast, this application utilizes a reinforcing material composed of a mixture of nano-silica sol, bentonite, quartz sand, and triethanolamine in a ratio of 2-5:3-6:5-15:0.1-0.3, thereby further improving the performance of the concrete.

[0067] By comparing the test results of Examples 1, 8-9, and Comparative Example 3, it can be seen that the crystallization induction agent in Comparative Example 4, composed of sodium silicate and aluminum hypophosphite in a weight ratio of 0.5:4, resulted in concrete with poor performance. In contrast, this application utilizes a crystallization induction agent composed of sodium silicate and aluminum hypophosphite in a weight ratio of 1-3:0.5-2, thereby further improving the performance of the concrete.

[0068] By comparing the test results of Examples 1, 10-13, and Comparative Example 5, it can be seen that the repair agent in Comparative Example 5, which was obtained by loading calcium ions onto unmodified zeolite material and mixing it with Bacillus pasteurellium bacterial solution, resulted in concrete with poor performance. The repair agent of this application, obtained by loading calcium ions onto aminosilane-modified zeolite material and mixing it with Bacillus pasteurellium bacterial solution, further improves the performance of the concrete.

[0069] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A hydraulic low-temperature resistant self-healing waterproof concrete, characterized in that, Specifically, it includes the following components by weight: 70-80 parts cement, 10-20 parts fly ash, 8-12 parts silica fume, 2.5-3.5 parts reinforcing material, 0.2-0.4 parts crystallization inducer, 1.5-2.5 parts repair agent, and 20-40 parts water; The reinforcing material is composed of nano-silica sol, bentonite, quartz sand and triethanolamine in a weight ratio of 2-5:3-6:5-15:0.1-0.

3. The crystallization inducer is composed of sodium silicate and aluminum hypophosphite in a weight ratio of 1-3:0.5-2; The repair agent is obtained by mixing calcium ions loaded onto an aminosilane-modified zeolite material with a Bacillus pasteurellium bacterial solution.

2. The hydraulic low-temperature resistant self-healing waterproof concrete according to claim 1, characterized in that, Specifically, it includes the following components by weight: 72-78 parts cement, 12-18 parts fly ash, 9-11 parts silica fume, 2.8-3.2 parts reinforcing material, 0.25-0.35 parts crystallization inducer, 1.7-2.2 parts repair agent, and 25-35 parts water.

3. The hydraulic low-temperature resistant self-healing waterproof concrete according to claim 1, characterized in that, The reinforcing material is composed of nano-silica sol, bentonite, quartz sand and triethanolamine in a weight ratio of 3-4:4-5:7-12:0.15-0.

25.

4. The hydraulic low-temperature resistant self-healing waterproof concrete according to claim 1, characterized in that, The preparation method of the nano-silica sol in the reinforcing material is as follows: nano-SiO2 and 0.2-0.5wt% sodium dodecyl sulfate aqueous solution are mixed at a weight ratio of 1:4-6 and sonicated for 30-60 min to obtain nano-silica sol; The bentonite has a particle size of 180-325 mesh and a density of 1.0-1.2 g / cm³. 3 ; The quartz sand has a particle size of 0.5-1 mm and a density of 2.5-2.8 g / cm³. 3 .

5. The hydraulic low-temperature resistant self-healing waterproof concrete according to claim 1, characterized in that, The crystallization inducer is composed of sodium silicate and aluminum hypophosphite in a weight ratio of 1.5-2.5:1-1.

8.

6. The hydraulic low-temperature resistant self-healing waterproof concrete according to claim 1, characterized in that, The preparation method of the repair agent is as follows: under the condition of 30-45℃, 20-26 parts by weight of zeolite are dispersed in 100 parts by weight of 0.3-0.6 wt% aminosilane-ethanol solution and stirred for 1-3 h; then CaCl2 is added to a final concentration of 1-3 wt% and stirred for 4-8 h; then bacteria with a concentration of 3-7×10⁻⁶ are added. 7 The final concentration of Bacillus pasteurellium culture was 0.02-0.06 wt% (cell / mL), and the mixture was stirred for 7-14 hours to obtain the repair agent.

7. The hydraulic low-temperature resistant self-healing waterproof concrete according to claim 6, characterized in that, The preparation method of the repair agent is as follows: At a temperature of 35-40℃, 22-24 parts by weight of zeolite are dispersed in 100 parts by weight of a 0.4-0.5 wt% aminosilane-ethanol solution, and stirred for 1.5-2.5 h; then CaCl2 is added to a final concentration of 1.5-2.5 wt%, and stirred for 5-7 h; then, bacteria with a concentration of 4-6 × 10⁻⁶ are added. 7 The pasteurization agent is obtained by mixing a Bacillus pasteurization culture at a concentration of 0.03-0.05 wt% (cell / mL) for 9-12 hours.

8. The hydraulic low-temperature resistant self-healing waterproof concrete according to claim 6, characterized in that, The aminosilane is selected from one or more of γ-aminopropyltriethoxysilane, N-β(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β(aminoethyl)-γ-aminopropylmethyldimethoxysilane, phenylaminomethyltriethoxysilane, phenylaminomethyltrimethoxysilane, aminoethylaminoethylaminopropyltrimethoxysilane, and polyaminoalkyltrialkoxysilane.

9. The low-temperature resistant, self-healing waterproof concrete according to claim 1, characterized in that, The fly ash is Class F, Grade I, with a density of 2200-2400 kg / m³. 3 The silica fume is silica micropowder with a specific surface area of ​​28±3 m². 2 / g.

10. The method for preparing low-temperature resistant, self-healing, waterproof concrete according to any one of claims 1-9, characterized in that, Specifically, the following steps are performed sequentially: Weigh out the corresponding weights of each raw material component; add cement, fly ash, silica fume, and reinforcing material to water and stir evenly; then add crystallization inducer and repair agent, mix and stir; after mixing, cure to obtain the hydraulic low-temperature resistant self-healing waterproof concrete.

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