Basalt fiber modified anti-freezing concrete and preparation method thereof

Abstract

The application relates to the technical field of concrete, and particularly discloses basalt fiber modified anti-freezing concrete and a preparation method thereof. The basalt fiber modified anti-freezing concrete is obtained by pouring a concrete mixture into a mold and curing, and the components of a paste modifier include ferric nitrate and calcium hydroxide; the molar ratio of the ferric nitrate to the calcium hydroxide is 2:(2.1-3). By adding the paste modifier in the concrete mixture, the degree of salt freezing damage can be reduced, and the service life of concrete structures such as concrete water channels can be prolonged.

Description

Technical Field

[0001] This application relates to the field of concrete technology, and more specifically, to a basalt fiber modified antifreeze concrete and its preparation method. Background Technology

[0002] Irrigation canals are an important component of roads, serving a drainage function during the rainy season and helping to reduce road surface flooding. Currently, irrigation canals in road engineering are usually made of concrete. Concrete has relatively poor tensile strength compared to its compressive strength. Therefore, concrete irrigation canals are prone to cracking under harsh conditions such as wet-dry cycles and frost damage due to tensile stress, resulting in a shortened service life of the irrigation canals.

[0003] One related technology is a fiber-modified antifreeze concrete, the mixture of which includes the following components by weight: 980-1020 parts coarse aggregate, 820-840 parts fine aggregate, 60-80 parts basalt crack-resistant fiber, 300-320 parts cement, 60-80 parts mineral admixture, 146-150 parts water, and 3.8-4.2 parts polycarboxylate superplasticizer.

[0004] Regarding the aforementioned technologies, the inventors believe that while the basalt crack-resistant fibers added in these technologies can provide some protection against frost heave cracking, the brine produced after de-icing salt is spread on snow-covered roads in winter flows into roadside ditches and seeps into the concrete ditches. In this situation, if the temperature drops further below the freezing point of the brine, the concrete ditches are prone to salt-frost damage. The impact of salt-frost damage is often more severe than simple frost heave cracking, and simply adding basalt crack-resistant fibers is insufficient to fully prevent it, which is detrimental to the long-term service life of the concrete ditches. Summary of the Invention

[0005] After de-icing salt is spread on snow-covered roads, the brine flows into concrete irrigation ditches. If the temperature subsequently drops further below the freezing point of the brine, the concrete ditches are susceptible to salt-freezing damage, which is often more severe than simple frost heave cracking. In this situation, the solutions in related technologies (simply adding basalt anti-cracking fibers) are insufficient to prevent salt-freezing damage, which is detrimental to the long-term service life of the concrete ditches. To improve this deficiency, this application provides a basalt fiber-modified antifreeze concrete and its preparation method.

[0006] In the first aspect, this application provides a basalt fiber-modified antifreeze concrete, which adopts the following technical solution:

[0007] A basalt fiber modified antifreeze concrete, wherein the basalt fiber modified antifreeze concrete is obtained by curing a concrete mixture in a formwork. The concrete mixture comprises the following components by weight: 980-1020 parts coarse aggregate, 820-840 parts fine aggregate, 60-80 parts basalt crack-resistant fiber, 300-320 parts cement, 60-80 parts mineral admixtures, 40-50 parts paste modifier, 146-150 parts water, and 3.8-4.2 parts polycarboxylate superplasticizer. The mineral admixtures include fly ash, and the paste modifier comprises ferric nitrate and calcium hydroxide, wherein the molar ratio of ferric nitrate to calcium hydroxide is 2:(2.1-3).

[0008] By adopting the above technical solution, this application adds a paste modifier to the concrete mix. In the concrete mix, ferric nitrate can react with calcium hydroxide to form calcium nitrate and ferric hydroxide. The generated ferric hydroxide is in a gel state, increasing the total gel content in the cement paste, which helps reduce the porosity inside the concrete, increases the density of the concrete structure, and hinders the intrusion of salt solutions. Moreover, when salt solutions intrude into the concrete structure, calcium nitrate dissolves into the salt solution, increasing the total concentration of inorganic salts in the salt solution, further lowering the freezing point of the salt solution, and delaying the occurrence of salt-freezing damage. Therefore, by adding the paste modifier of this application to the concrete mix, the degree of salt-freezing damage can be reduced, which helps to extend the service life of concrete structures such as concrete canals.

[0009] Preferably, the molar ratio of ferric nitrate to calcium hydroxide in the slurry modifier is 2:3.

[0010] By adopting the above technical solution, the molar ratio of ferric nitrate to calcium hydroxide reacts precisely at 2:3. Based on this, when the amount of calcium hydroxide added is relatively reduced, ferric nitrate will consume some of the calcium hydroxide produced during cement hydration. This results in insufficient calcium hydroxide in the cement paste to fully activate the hydration activity of the mineral admixtures, which is detrimental to maximizing the total amount of gel products in the concrete mix. Therefore, when the molar ratio of ferric nitrate to calcium hydroxide in the paste modifier is 2:3, the paste modifier can be fully effective, and its negative impact on the total amount of gel products in the concrete mix is ​​relatively small.

[0011] Preferably, the slurry modifier is prepared according to the following method:

[0012] (1) After drying the carbide slag and ferric nitrate to constant weight, they are mixed to obtain a mixture;

[0013] (2) Grind the mixture to obtain a slurry modifier.

[0014] By adopting the above technical solution, calcium carbide slag, a waste residue generated from the calcium carbide industry, is obtained by digesting calcium carbide with water, and its main component is calcium hydroxide. Using calcium carbide slag to provide calcium hydroxide enables the rational utilization of solid waste and helps reduce production costs.

[0015] Preferably, the slurry modifier also includes sodium tripolyphosphate, which is mixed with carbide slag and ferric nitrate in step (1) of the slurry modifier preparation method.

[0016] By adopting the above technical solution, this application adds sodium tripolyphosphate to the slurry modifier. Sodium tripolyphosphate has good adsorption properties for both iron ions and calcium ions, which can reduce particle agglomeration and improve the grinding effect during the grinding process.

[0017] Preferably, the amount of sodium tripolyphosphate used is 0.01-0.1% of the sum of the weights of carbide slag and ferric nitrate.

[0018] By employing the above technical solution, when the amount of sodium tripolyphosphate is small, the agglomeration of carbide slag and ferric nitrate during grinding is quite severe, which is not conducive to the full participation of carbide slag and ferric nitrate in the reaction. When the amount of sodium tripolyphosphate is excessive, the adsorption of carbide slag by sodium tripolyphosphate will hinder the reaction between ferric nitrate and calcium hydroxide, inhibiting the production of ferric hydroxide and calcium nitrate, which is not conducive to fully increasing the total amount of gel products in the concrete mixture. This application optimizes the amount of sodium tripolyphosphate, which is beneficial to the full reaction of ferric nitrate and calcium hydroxide in the paste modifier.

[0019] Preferably, the basalt crack-resistant fiber is obtained by cutting basalt fiber filaments.

[0020] By adopting the above technical solution, basalt fiber precursor is selected as the raw material for the production of basalt crack-resistant fiber. Basalt fiber precursor has good mechanical properties and its tensile strength is much higher than that of concrete. Therefore, the basalt crack-resistant fiber made from basalt fiber precursor improves the tensile properties of concrete, helps to reduce the damage to the concrete structure caused by the tensile stress generated during the salt freezing process, and improves the salt freezing resistance of concrete.

[0021] Preferably, the basalt crack-resistant fiber is obtained by cutting basalt fiber twisted yarn.

[0022] By adopting the above technical solution, basalt fiber twisted yarn is obtained by twisting and plying multiple basalt fiber filaments. During the twisting and plying process, the basalt fiber filaments rub against each other, thus giving the basalt fiber filaments in the basalt fiber twisted yarn a greater roughness (compared to untwisted basalt fiber filaments). This results in a stronger bond between the cement paste (and the cement stone produced during curing) and the basalt crack-resistant fibers, reducing the possibility of slippage of the basalt crack-resistant fibers under tensile stress. This helps improve the concrete's resistance to tensile stress generated during salt-freezing damage and reduces the damage caused to the concrete structure by tensile stress generated during the salt-freezing process.

[0023] Preferably, the twist of the basalt fiber twisted yarn is 60-90 twists / m.

[0024] By adopting the above technical solution, the twist range of basalt fiber twisted yarn is optimized, which helps to reduce the possibility of basalt crack-resistant fibers sliding under tensile stress, improves the concrete's resistance to tensile stress generated during salt-freezing damage, and reduces the damage to concrete structures caused by tensile stress generated during salt-freezing.

[0025] Preferably, the mineral admixture includes metakaolin, and the metakaolin accounts for 8-16% of the weight of the mineral admixture.

[0026] By adopting the above technical solution, metakaolin not only participates in the hydration reaction itself, but the addition of metakaolin also helps to increase the total amount of hydrated calcium silicate gel and hydrated calcium sulfoaluminate in concrete, and can promote the positive reaction of pozzolanic material, thus helping to improve the filling effect on the internal pores of concrete. This application not only preferentially includes metakaolin as a mineral admixture, but also preferentially selects the dosage range of metakaolin, which helps to fully improve the salt-freezing resistance of concrete while saving the amount of metakaolin used.

[0027] Secondly, this application provides a method for preparing basalt fiber modified antifreeze concrete, which adopts the following technical solution.

[0028] A method for preparing basalt fiber-modified antifreeze concrete includes the following steps:

[0029] (1) Mix coarse aggregate, fine aggregate, basalt crack-resistant fiber, cement, mineral admixture with any of the above-mentioned slurry modifiers to obtain dry material; mix water and polycarboxylate superplasticizer to obtain superplasticizer solution;

[0030] (2) Stir the dry material, then add the water-reducing agent solution to the dry material and mix and stir again to obtain concrete mixture;

[0031] (3) The modified mixture is placed in the mold for curing to obtain basalt fiber modified antifreeze concrete.

[0032] By adopting the above technical solution, this application first mixes dry materials containing slurry modifier and prepares water-reducing agent solution, then mixes the two into concrete mixture, and then performs mold curing to obtain basalt fiber modified antifreeze concrete.

[0033] In summary, this application has the following beneficial effects:

[0034] 1. This application utilizes ferric hydroxide gel generated by the reaction of ferric nitrate and calcium hydroxide to increase the total gel content in cement paste, thereby improving the density of the concrete structure. Simultaneously, the generated calcium nitrate increases the total concentration of inorganic salts in the salt solution penetrating the concrete structure, further lowering the freezing point of the salt solution and delaying salt-freezing damage. By adding the paste modifier of this application to concrete mixes, the degree of salt-freezing damage can be reduced, helping to extend the service life of concrete structures such as concrete canals.

[0035] 2. In this application, the preferred basalt crack-resistant fiber is obtained by cutting basalt fiber twisted yarn. During the twisting and plying process, the basalt fiber filaments rub against each other. Therefore, the basalt fiber filaments in the basalt fiber twisted yarn have a large roughness, which reduces the possibility of the basalt crack-resistant fiber sliding under tensile stress. This helps to improve the concrete's resistance to tensile stress generated during salt-freezing damage and reduces the damage to the concrete structure caused by tensile stress generated during salt-freezing. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the embodiments, preparation examples and comparative examples. The raw materials involved in the present application can all be obtained commercially.

[0037] Preparation example of slurry modifier

[0038] The following explanation uses Preparation Example 1 as an example.

[0039] Preparation Example 1

[0040] In this preparation example, the slurry modifier was prepared according to the following method:

[0041] (1) Dry the carbide slag and ferric nitrate to constant weight, then test the calcium hydroxide content in the carbide slag, and mix the carbide slag and ferric nitrate in a molar ratio of ferric nitrate to calcium hydroxide of 2:2.1 to obtain a mixture;

[0042] (2) The mixture was ground at a speed of 16.3 r / min for 30 min to obtain the slurry modifier.

[0043] As shown in Table 1, the difference between preparation examples 1-5 lies in the different molar ratios of ferric nitrate and calcium hydroxide.

[0044] Table 1. Molar ratio of ferric nitrate to calcium hydroxide

[0045] sample Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Preparation Example 5 Ferric nitrate: calcium hydroxide 2:2.1 2:2.3 2:2.5 2:2.7 2:3

[0046] Preparation Example 6

[0047] The difference between this preparation example and preparation example 5 is that the slurry modifier also includes sodium tripolyphosphate. In step (1) of the slurry modifier preparation method, sodium tripolyphosphate is mixed together with carbide slag and ferric nitrate. The amount of sodium tripolyphosphate is 0.01% of the sum of the weights of carbide slag and ferric nitrate.

[0048] Preparation Example 7

[0049] The difference between this preparation example and preparation example 6 is that the amount of sodium tripolyphosphate used is 0.05% of the sum of the weights of carbide slag and ferric nitrate.

[0050] Preparation Example 8

[0051] The difference between this preparation example and Preparation Example 6 is that the amount of sodium tripolyphosphate used is 0.1% of the sum of the weights of carbide slag and ferric nitrate.

[0052] Preparation Example 9

[0053] The difference between this preparation example and preparation example 8 is that the amount of sodium tripolyphosphate used is 0.15% of the sum of the weights of carbide slag and ferric nitrate. Example

[0054] Examples 1-5

[0055] The following description uses Example 1 as an example.

[0056] Example 1

[0057] This embodiment provides a basalt fiber-modified antifreeze concrete, which is obtained by mixing concrete mix and a paste modifier, followed by curing in formwork. The concrete mix includes the following components: 980 kg coarse aggregate, 820 kg fine aggregate, 60 kg basalt crack-resistant fiber, 300 kg cement, 80 kg mineral admixtures, 40 kg paste modifier, 146 kg water, and 3.8 kg polycarboxylate superplasticizer; the coarse aggregate is 5-31.5 continuously graded crushed stone (granite), and the fine aggregate has a fineness modulus of 2. 7. Natural medium sand from Zone II; the nominal length of the basalt crack-resistant fiber is 25 mm, and the nominal diameter of the single filament is 18 μm. It is obtained by cutting and processing basalt fiber precursor; the cement is P.O42.5 ordinary Portland cement, and the mineral admixture is Class F Grade I fly ash; the polycarboxylate superplasticizer is tested according to the test method recorded in "GB8076-2008 Concrete Admixtures". The water reduction rate is 18% when the dosage is 1% of the weight of the reference cement; the slurry modifier is the slurry modifier of Preparation Example 1.

[0058] This embodiment also provides a method for preparing basalt fiber modified antifreeze concrete, including the following steps:

[0059] (1) Mix coarse aggregate, fine aggregate, basalt crack-resistant fiber, cement, mineral admixture and slurry modifier to obtain dry material; mix water and polycarboxylate superplasticizer to obtain superplasticizer solution;

[0060] (2) Stir the dry material, then add the water-reducing agent solution to the dry material and mix and stir again to obtain concrete mixture;

[0061] (3) The modified mixture is placed in the mold for curing to obtain basalt fiber modified antifreeze concrete.

[0062] As shown in Table 2, the main difference between Examples 1-5 lies in the different raw material ratios of the concrete mix.

[0063] Table 2 Raw material proportions for concrete mix

[0064] sample Coarse aggregate / kg Fine aggregate / kg Basalt crack-resistant fiber / kg cement / kg Mineral admixtures / kg Slurry modifier / kg Water / kg Polycarboxylate superplasticizer / kg Example 1 980 820 60 300 80 40 146 3.8 Example 2 990 825 65 305 85 42 147 3.9 Example 3 1000 830 70 310 90 45 148 4.0 Example 4 1010 835 75 315 95 48 149 4.1 Example 5 1020 840 80 320 100 50 150 4.2

[0065] Examples 6-13

[0066] As shown in Table 3, the difference between Examples 6-13 and Example 5 is that the preparation examples of the slurry modifier are different.

[0067] Table 3 Examples of preparation of slurry modifiers

[0068] sample Preparation Example sample Preparation Example Example 5 Preparation Example 1 Example 10 Preparation Example 6 Example 6 Preparation Example 2 Example 11 Preparation Example 7 Example 7 Preparation Example 3 Example 12 Preparation Example 8 Example 8 Preparation Example 4 Example 13 Preparation Example 9 Example 9 Preparation Example 5 / / Example 14

[0069] The difference between this embodiment and Embodiment 12 is that the basalt crack-resistant fiber is obtained by cutting basalt fiber twisted yarn, and the twist of the basalt fiber twisted yarn is 50 twists / m.

[0070] As shown in Table 4, the difference between Examples 14-18 is that the twist of the basalt fiber twisted yarn used to prepare the basalt crack-resistant fiber is different.

[0071] Table 4 Twist of basalt fiber twisted yarn

[0072] sample Example 14 Example 15 Example 16 Example 17 Example 18 Twist (twist / m) 50 60 70 80 90 Example 19

[0073] The difference between this embodiment and embodiment 18 is that the mineral admixture is composed of fly ash and metakaolin, the fly ash is Class F Grade I fly ash, and the metakaolin accounts for 4% of the total weight of the mineral admixture.

[0074] As shown in Table 5, the difference between Examples 19-23 is that the percentage of metakaolin in the total weight of the mineral admixture (hereinafter referred to as the metakaolin percentage) is different.

[0075] Table 5

[0076] sample Example 19 Example 20 Example 21 Example 22 Example 23 Percentage of metakaolin / % 4 8 12 16 20 Comparative Example

[0077] Comparative Example 1

[0078] The difference between this comparative example and Example 1 is that the concrete mixture does not include a paste modifier.

[0079] Comparative Example 2

[0080] The difference between this comparative example and Example 1 is that the slurry modifier in Example 1 is replaced with ferric nitrate. In this comparative example, the total amount of ferric nitrate used is the same as the weight of ferric nitrate contained in the slurry modifier of Example 1.

[0081] Comparative Example 3

[0082] The difference between this comparative example and Example 1 is that the slurry modifier in Example 1 is replaced with calcium carbide slag. In this comparative example, the total amount of calcium hydroxide contained in the calcium carbide slag is the same as the weight of calcium hydroxide contained in the slurry modifier in Example 1.

[0083] Performance testing methods

[0084] Specimen preparation: The concrete mixtures of each embodiment and comparative example were prepared into specimens of 40mm×40mm×160mm. After natural curing in an environment of 20±2℃ and 60±5% humidity for 1 day, the specimens were demolded and then immersed in water for 28 days in a standard curing room of 20±2℃ and ≥95% humidity for later use.

[0085] Test procedure: The specimens that had been soaked and cured in water for 28 days were removed from the water and dried to constant weight in an oven at 105℃. The specimens were then dried according to the single-sided freeze-thaw method (salt-freeze method) described in GB / T 50082-2009 Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete. An 8% sodium chloride solution was used to test the average spalling mass after 30 freeze-thaw cycles (minimum temperature -20℃). The average spalling mass refers to the average spalling mass measured from three specimens of the same type. The ratio of the average spalling mass M to the area A of the specimen in contact with the salt solution was calculated and recorded as the spalling amount. Then, the ratio between the spalling amount of each example and comparative example and the spalling amount of Comparative Example 1 was calculated and recorded as the relative spalling amount. The results are shown in Table 6.

[0086] Table 6 Relative Peeling Amount

[0087] sample Relative peeling amount / % sample Relative peeling amount / % Example 1 78.2 Example 14 61.4 Example 2 77.6 Example 15 57.5 Example 3 76.5 Example 16 55.2 Example 4 74.7 Example 17 53.8 Example 5 73.1 Example 18 51.1 Example 6 71.2 Example 19 49.5 Example 7 69.8 Example 20 48.2 Example 8 68.4 Example 21 47.5 Example 9 67.0 Example 22 46.8 Example 10 65.9 Example 23 46.6 Example 11 64.2 Comparative Example 1 100.0 Example 12 63.8 Comparative Example 2 93.8 Example 13 64.0 Comparative Example 3 98.5

[0088] As can be seen from Examples 1-5 and Comparative Example 1, and in conjunction with Table 6, the relative spalling amounts measured in Examples 1-5 are all lower than those in Comparative Example 1. This indicates that the ferric hydroxide gel generated by the reaction of ferric nitrate and calcium hydroxide in this application increases the total gel content in the cement paste, thereby improving the density of the concrete structure. Simultaneously, the generated calcium nitrate can increase the total concentration of inorganic salts in the salt solution penetrating the concrete structure, further lowering the freezing point of the salt solution and delaying the occurrence of salt-freezing damage. By adding the paste modifier of this application to the concrete mix, the degree of salt-freezing damage can be reduced, which helps to extend the service life of concrete structures such as concrete canals.

[0089] As can be seen from Example 1 and Comparative Example 2, and Table 6, when ferric nitrate is used instead of the paste modifier in Example 1, the ferric nitrate consumes some of the calcium hydroxide produced by cement hydration. As a result, there is not enough calcium hydroxide in the cement paste to fully activate the hydration activity of the mineral admixtures, which is not conducive to fully increasing the total amount of gel products in the concrete mix and affects the salt freeze resistance of the concrete.

[0090] As can be seen from Examples 5 and 6-9 and Table 6, when the paste modifier is prepared with a molar ratio of ferric nitrate to calcium hydroxide of 2:3, the ferric nitrate in the paste modifier does not need to consume additional calcium hydroxide produced by cement hydration. Therefore, the gel product can be formed more fully, thereby improving the salt freeze resistance of concrete.

[0091] Combining Examples 9 and 10-13 with Table 6, it can be seen that when the amount of sodium tripolyphosphate added is within the range of 0.01-0.1% of the sum of the weights of carbide slag and ferric nitrate, the concrete exhibits relatively good salt-freezing resistance. However, further increasing the amount of sodium tripolyphosphate hinders the reaction between ferric nitrate and calcium hydroxide due to its adsorption of carbide slag, thus suppressing the production of ferric hydroxide and calcium nitrate. This is detrimental to fully increasing the total amount of gel products in the concrete mix and affects the concrete's salt-freezing resistance.

[0092] Combined with Examples 12, 14-18 and Table 6, it can be seen that basalt crack-resistant fibers obtained by cutting and processing basalt fiber twisted yarn are more helpful in reducing the quality loss of concrete under salt freezing conditions, and when the twist of basalt fiber twisted yarn is 60-90 twists / m, the relative spalling of concrete is lower.

[0093] Based on Examples 18, 19-23, and Table 6, it can be seen that when the mineral admixture contains 8-20% metakaolin, the relative spalling of the concrete is relatively low. Example 23 has the highest metakaolin content, but the measured spalling is relatively less different from Example 22. Therefore, when the weight ratio of metakaolin in the mineral admixture is 8-16%, it helps to significantly improve the salt-frost resistance of the concrete while saving on metakaolin usage. If cost is not a factor, in Examples 18-23, selecting a 20% metakaolin content according to the implementation method of Example 23 yields the best results.

[0094] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A basalt fiber-modified antifreeze concrete, characterized in that, The basalt fiber modified antifreeze concrete is obtained by curing a concrete mixture in a mold. The concrete mixture comprises the following components by weight: 980-1020 parts coarse aggregate, 820-840 parts fine aggregate, 60-80 parts basalt crack-resistant fiber, 300-320 parts cement, 60-80 parts mineral admixtures, 40-50 parts paste modifier, 146-150 parts water, and 3.8-4.2 parts polycarboxylate superplasticizer. The mineral admixtures include fly ash, and the paste modifier comprises ferric nitrate and calcium hydroxide, wherein the molar ratio of ferric nitrate to calcium hydroxide is 2:(2.1-3). The slurry modifier is prepared according to the following method: (1) After drying the carbide slag and ferric nitrate to constant weight, they are mixed to obtain a mixture; the components of the slurry modifier also include sodium tripolyphosphate, which is mixed with the carbide slag and ferric nitrate in this step; (2) Grind the mixture to obtain a slurry modifier.

2. The basalt fiber-modified antifreeze concrete according to claim 1, characterized in that, In the slurry modifier, the molar ratio of ferric nitrate to calcium hydroxide is 2:

3.

3. The basalt fiber-modified frost-resistant concrete according to claim 1, characterized in that, The amount of sodium tripolyphosphate used is 0.01-0.1% of the sum of the weights of carbide slag and ferric nitrate.

4. The basalt fiber-modified frost-resistant concrete according to claim 1, characterized in that, The basalt crack-resistant fiber is obtained by cutting and processing basalt fiber filaments.

5. The basalt fiber-modified antifreeze concrete according to claim 1, characterized in that, The basalt crack-resistant fiber is obtained by cutting and processing basalt fiber twisted yarn.

6. The basalt fiber-modified antifreeze concrete according to claim 5, characterized in that, The twist of the basalt fiber twisted yarn is 60-90 twists / m.

7. The basalt fiber-modified frost-resistant concrete according to claim 1, characterized in that, The mineral admixture includes metakaolin, which accounts for 8-16% of the total weight of the mineral admixture.

8. A method for preparing basalt fiber-modified antifreeze concrete, characterized in that, Includes the following steps: (1) Mix coarse aggregate, fine aggregate, basalt crack-resistant fiber, cement, mineral admixture and the slurry modifier according to any one of claims 1-7 to obtain dry material; mix water and polycarboxylate superplasticizer to obtain superplasticizer solution; (2) Stir the dry material, then add the water-reducing agent solution to the dry material and mix and stir again to obtain concrete mixture; (3) The concrete mixture is placed in the mold for curing to obtain basalt fiber modified antifreeze concrete.