A crack-resistant composite material and a method for preparing the same

Abstract

The application relates to the field of concrete admixtures, and particularly discloses an anti-cracking composite and a preparation method thereof. The anti-cracking composite comprises polyvinyl alcohol fibers and a steel fiber-mica powder compound; and the preparation method comprises the following steps: blending polyvinyl alcohol fibers and seaweed fibers to obtain composite fibers, cutting the composite fibers, and then stirring and mixing the composite fibers and the steel fiber-mica powder compound. After the anti-cracking composite is mixed into concrete, the steel fibers are overlapped with each other to form a structural network in the concrete, the mica powder particles on the steel fibers extend into the surrounding concrete, the peeling between the steel fibers and the concrete is inhibited, the polyvinyl alcohol fibers have low elongation and play a role similar to a screen after being uniformly dispersed, the sinking of particle components in the concrete is inhibited, the formation of capillary channels is reduced, the polyvinyl alcohol fibers and the steel fiber-mica powder compound are intertwined after being blended, the dispersion of directional stress is promoted, and the formation and development of cracks are hindered, so that the anti-cracking performance of the concrete is comprehensively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of concrete admixtures, more particularly, it relates to an anti-cracking admixture and a preparation method thereof. BACKGROUND

[0002] Concrete is one of the most important civil engineering materials in the contemporary era, which is a kind of artificial stone made of cementitious materials, granular aggregates (also known as aggregates), water, and, if necessary, admixtures and additives, according to a certain proportion, uniform stirring, compaction, curing and hardening, and is widely used in all aspects of the construction field.

[0003] As disclosed in the patent No. CN200710201132, a C100 high-performance concrete is formed by mixing, cementing cementitious materials, sand, stone, water and admixtures, the cementitious materials include cement and admixtures, the addition amount of the cementitious materials is 500-600 kg per cubic meter of concrete, the cement is 42.5, the admixtures include three components of silica fume, fly ash and slag powder, the active SiO2 content is 20-40% of the total weight of the cementitious materials, the specific surface area is 1000-1200 m 2 / kg, the admixture is a polycarboxylic acid superplasticizer with a mixing amount of 2-5% of the total weight of the cementitious materials, and the activator is a mixture of soot and coal gangue powder with a mixing amount of 1-5% of the total weight of the cementitious materials.

[0004] The above concrete is mixed with silica fume and nanomaterials to improve the strength of the concrete, which leads to large heat release, large early shrinkage, low crack resistance, easy cracking and affects the normal use of the concrete, and further improvement is needed. SUMMARY

[0005] In order to improve the crack resistance of concrete, the present application provides an anti-cracking admixture and a preparation method thereof.

[0006] The anti-cracking admixture and the preparation method thereof provided by the present application adopt the following technical scheme:

[0007] In a first aspect, the present application provides an anti-cracking admixture, which adopts the following technical scheme:

[0008] An anti-cracking admixture, which comprises polyvinyl alcohol fibers and steel fiber-mica powder composites in a mass ratio of 1: (8-10), and the preparation method of the steel fiber-mica powder composites is as follows: the steel fibers are spread flat without overlapping, then a glue solution is applied on the surface of the steel fibers, then the mica powder is poured into a sieve, the sieve is placed above the steel fibers, and the sieve is shaken back and forth and moved to uniformly spread the mica powder on the steel fibers, and the steel fibers are dried at 45-55℃ to obtain the steel fiber-mica powder composites.

[0009] By adopting the technical scheme, the mica powder is adhered and fixed to the surface of the steel fiber by the glue solution to obtain a steel fiber-mica powder compound. When the steel fiber-mica powder compound is mixed into the concrete, the steel fibers are overlapped to form a structural network in the concrete, and the strength of the steel fiber is high, which improves the overall structural strength of the concrete and is beneficial to improve the crack resistance of the concrete under load. The mica powder particles on the steel fiber extend into the surrounding concrete, which inhibits the relative sliding between the steel fiber and the concrete under external force and reduces the peeling of the steel fiber, thereby facilitating the reduction of concrete cracking.

[0010] The polyvinyl alcohol fiber has low elongation and is uniformly dispersed in the concrete to play a role similar to a screen. The particle components are not easy to stretch the polyvinyl alcohol fiber, thereby inhibiting the sinking of the particle components in the concrete, improving the uniformity of the concrete as a whole, reducing the capillary channels formed by the overflow of water in the concrete matrix, and inhibiting the cracking of the concrete.

[0011] The mica powder has a flaky structure and is distributed in a random direction after being adhered to the surface of the steel fiber. After the polyvinyl alcohol fiber and the steel fiber-mica powder compound are added to the concrete for blending, the polyvinyl alcohol fiber and the steel fiber-mica powder compound are intertwined with each other during the stirring process, and the structure network inside the concrete is co-constructed. When the concrete is subjected to external force, the dispersed directional stress is promoted, and the formation and development of cracks in the concrete are hindered, thereby further improving the crack resistance of the concrete.

[0012] Preferably, it further comprises sodium fluorosilicate, and the sodium fluorosilicate accounts for 0.5-1wt% of the steel fiber-mica powder compound.

[0013] By adopting the above technical scheme, the sodium fluorosilicate has the effect of preventing corrosion of the steel fiber, which is beneficial to prolong the service life of the steel fiber and improve the durability of the crack resistance of the concrete.

[0014] Preferably, it further comprises polyacryloyl dimethyl ammonium taurate, and the mass ratio of the polyacryloyl dimethyl ammonium taurate to the polyvinyl alcohol fiber is (1-2):1.

[0015] By adopting the above technical scheme, the ammonium groups on the polyacryloyl dimethyl ammonium taurate crosslink with the hydroxyl groups on the polyvinyl alcohol fiber, which helps to reduce microcracks in the concrete and improve the crack resistance of the concrete.

[0016] Preferably, it further comprises sodium bicarbonate, and the sodium bicarbonate accounts for 15-25wt% of the steel fiber-mica powder compound.

[0017] By adopting the technical scheme, cement components in the concrete release heat during hydration, and sodium bicarbonate is decomposed into sodium carbonate and carbon dioxide. On one hand, the generation of gas makes the concrete generate a large number of bubbles that are not connected with each other, blocks capillary channels of water seepage, enhances the impermeability of the concrete, increases the ultimate tensile value of the concrete, and further improves the crack resistance of the concrete. On the other hand, the hydrolysis of sodium bicarbonate is an endothermic reaction, which can alleviate the excessively rapid increase of the internal temperature of the concrete during the process that the internal temperature of the concrete gradually increases due to the hydration of cement, thereby reducing the temperature difference between the inside and outside of the concrete and inhibiting the formation of internal cracks of the concrete.

[0018] Preferably, the glue solution is epoxy resin ab glue.

[0019] In a second aspect, the application provides a preparation method of the crack-resistant composite material, which adopts the following technical scheme:

[0020] The preparation method of the crack-resistant composite material comprises the following steps: blending polyvinyl alcohol fibers and seaweed fibers to obtain composite fibers, cutting the composite fibers so that the length of the composite fibers is 3-6 mm, and then stirring and mixing the composite fibers and a steel fiber-mica powder compound.

[0021] By adopting the technical scheme, the seaweed fibers become gelatinous when they come into contact with water, and the polyvinyl alcohol fibers and the concrete matrix are bonded after the concrete is solidified, thereby producing anchoring effect between the polyvinyl alcohol fibers and the concrete, and improving the stability of the overall properties of the concrete.

[0022] Preferably, the polyvinyl alcohol fibers are pretreated before being blended with the seaweed fibers. The pretreatment step is as follows: the polyvinyl alcohol fibers are soaked in acetone for 20-24 h, then filtered, and then dried at a temperature of 60-70℃ for 6-7 h.

[0023] By adopting the technical scheme, the polyvinyl alcohol fibers are pretreated before being blended, so that the polyvinyl alcohol fibers are freed from grease, waxy substances, pectin and other lipid substances on the surface, and defatted polyvinyl alcohol fibers are obtained. The defatted polyvinyl alcohol fibers are directly in contact with the concrete matrix, which increases the friction between the polyvinyl alcohol fibers and the concrete matrix, and further improves the anchoring effect between the polyvinyl alcohol fibers and the concrete.

[0024] In summary, the application has the following beneficial effects:

[0025] 1、Due to the steel fiber-mica powder composite and polyvinyl alcohol fiber are adopted in the application, when the steel fiber-mica powder composite is mixed into the concrete, the steel fibers overlap each other to form a structural network in the concrete, thereby improving the overall structural strength of the concrete, the mica powder particles on the steel fibers extend into the surrounding concrete, thereby inhibiting the peeling between the steel fibers and the concrete, thus being conducive to reducing the cracking of the concrete, the polyvinyl alcohol fiber has low elongation and is uniformly dispersed in the concrete to play a role similar to a screen, thereby inhibiting the sinking of the particle components in the concrete and reducing the capillary channels formed by the overflow of water in the concrete matrix, the mica powder has a sheet structure and is randomly distributed after adhering to the surface of the steel fiber, the polyvinyl alcohol fiber and the steel fiber-mica powder composite are intertwined after blending, thereby promoting the dispersion of the directional stress and hindering the formation and development of cracks in the concrete, and thus the anti-cracking performance of the concrete is comprehensively improved.

[0026] 2、In the application, seaweed fiber is preferably used, because the seaweed fiber turns into gel when it comes into contact with water, thereby bonding the polyvinyl alcohol fiber and the concrete matrix after the concrete solidifies, and producing an anchoring effect between the polyvinyl alcohol fiber and the concrete, thereby improving the stability of the overall properties of the concrete.

[0027] 3、The method of the application, by pretreating the polyvinyl alcohol fiber before blending, the lipids on the surface of the polyvinyl alcohol fiber are removed to obtain defatted polyvinyl alcohol fiber, the defatted polyvinyl alcohol fiber directly contacts the concrete matrix, thereby increasing the friction between the polyvinyl alcohol fiber and the concrete matrix and further improving the anchoring effect between the polyvinyl alcohol fiber and the concrete. DETAILED DESCRIPTION

[0028] The application will be further described in detail below in conjunction with the examples.

[0029]

[0030]

[0031] The raw materials used in the following embodiments can be sourced from ordinary commercial markets, except for special instructions.

[0032] Preparation example of raw materials

[0033] Preparation example 1

[0034] Preparation of steel fiber-mica powder composite: spread the steel fibers flat, without overlapping, then apply glue on the surface of the steel fibers, then pour the mica powder into a sieve, place the sieve above the steel fibers, shake and move the sieve back and forth, so that the mica powder is evenly scattered on the steel fibers, and then place the steel fibers in an oven at 45°C for drying, to obtain the steel fiber-mica powder composite.

[0035] The mass ratio of mica powder to steel fiber is 1:25.

[0036] Preparation Example 2

[0037] Preparation of steel fiber-mica powder composite: The steel fibers are spread flat without overlapping, then the glue solution is applied on the surface of the steel fibers, and then the mica powder is poured into a sieve, the sieve is placed above the steel fibers, and the sieve is shaken back and forth and moved to evenly spread the mica powder on the steel fibers. The steel fibers are dried at 55°C to obtain the steel fiber-mica powder composite.

[0038] The mass ratio of the mica powder to the steel fibers is 1:25.

[0039] Preparation Example 3

[0040] Preparation of steel fiber-mica powder composite: The steel fibers are spread flat without overlapping, then the glue solution is applied on the surface of the steel fibers, and then the mica powder is poured into a sieve, the sieve is placed above the steel fibers, and the sieve is shaken back and forth and moved to evenly spread the mica powder on the steel fibers. The steel fibers are dried at 55°C to obtain the steel fiber-mica powder composite.

[0041] The mass ratio of the mica powder to the steel fibers is 1:25.

[0042] Preparation Example 4

[0043] Preparation of steel fiber-nano-silicon dioxide composite: The steel fibers are spread flat without overlapping, then the glue solution is applied on the surface of the steel fibers, and then the nano-silicon dioxide powder is poured into a sieve, the sieve is placed above the steel fibers, and the sieve is shaken back and forth and moved to evenly spread the nano-silicon dioxide powder on the steel fibers. The steel fibers are dried at 50°C to obtain the steel fiber-nano-silicon dioxide composite.

[0044] The mass ratio of the nano-silicon dioxide powder to the steel fibers is 1:25.

[0045] Embodiment

[0046] Embodiment 1

[0047] The present application discloses an anti-cracking composite material, which comprises polyvinyl alcohol fibers and a steel fiber-mica powder composite in a mass ratio of 1:8, and the steel fiber-mica powder composite is prepared by Preparation Example 1.

[0048] The preparation method of the anti-cracking composite material comprises the following steps: stirring and uniformly mixing the polyvinyl alcohol fibers and the steel fiber-mica powder composite.

[0049] Embodiment 2

[0050] The present application discloses an anti-cracking composite material, which comprises polyvinyl alcohol fibers and a steel fiber-mica powder composite in a mass ratio of 1:10, and the steel fiber-mica powder composite is prepared by Preparation Example 2.

[0051] The preparation method of the anti-cracking composite material comprises the following steps: stirring and mixing the polyvinyl alcohol fiber and the steel fiber-mica powder composite.

[0052] Example 3

[0053] The application discloses an anti-cracking composite material, which comprises polyvinyl alcohol fiber and steel fiber-mica powder composite at a mass ratio of 1:9, and the steel fiber-mica powder composite is prepared by the preparation example 3.

[0054] The preparation method of the anti-cracking composite material comprises the following steps: stirring and mixing the polyvinyl alcohol fiber and the steel fiber-mica powder composite.

[0055] Example 4

[0056] The difference from the example 1 is that the anti-cracking composite material further comprises sodium fluorosilicate, and the sodium fluorosilicate accounts for 0.5wt% of the steel fiber-mica powder composite.

[0057] Example 5

[0058] The difference from the example 1 is that the anti-cracking composite material further comprises polyacryloyl dimethyl ammonium taurate, and the mass ratio of the polyacryloyl dimethyl ammonium taurate and the polyvinyl alcohol fiber is 1:1.

[0059] Example 6

[0060] The difference from the example 1 is that the anti-cracking composite material further comprises sodium bicarbonate, and the sodium bicarbonate accounts for 15wt% of the steel fiber-mica powder composite.

[0061] Example 7

[0062] The difference from the example 1 is that the preparation method of the anti-cracking composite material is different.

[0063] The preparation method of the anti-cracking composite material comprises the following steps: blending polyvinyl alcohol fiber and seaweed fiber at a mass ratio of 1:1 to obtain composite fiber, cutting the composite fiber so that the length of the composite fiber is 3-6mm, and then stirring and mixing the composite fiber and the steel fiber-mica powder composite.

[0064] Example 8

[0065] The difference from the example 7 is that the preparation method of the anti-cracking composite material is different.

[0066] The preparation method of the anti-cracking composite material comprises the following steps: pretreating polyvinyl alcohol fibers, the pretreatment step being: soaking the polyvinyl alcohol fibers in acetone for 20 h, then suction filtering, and then drying at a temperature of 60 ℃ for 7 h; mixing the pretreated polyvinyl alcohol fibers and seaweed fibers in a mass ratio of 1:1 to obtain composite fibers; cutting the composite fibers so that the length of the composite fibers is 3-6 mm; and then stirring and mixing the composite fibers and a steel fiber-mica powder composite.

[0067] Example 9

[0068] The anti-cracking composite material disclosed in the present application comprises polyvinyl alcohol fibers, a steel fiber-mica powder composite, sodium fluosilicate, polyacryloyl dimethyl ammonium taurate and sodium bicarbonate, the mass ratio of the polyvinyl alcohol fibers and the steel fiber-mica powder composite is 1:8, the sodium fluosilicate accounts for 0.5 wt% of the steel fiber-mica powder composite, the mass ratio of the polyacryloyl dimethyl ammonium taurate and the polyvinyl alcohol fibers is 1:1, and the sodium bicarbonate accounts for 15 wt% of the steel fiber-mica powder composite, the steel fiber-mica powder composite being prepared according to Preparation Example 1.

[0069] The preparation method of the anti-cracking composite material comprises the following steps: pretreating polyvinyl alcohol fibers, the pretreatment step being: soaking the polyvinyl alcohol fibers in acetone for 20 h, then suction filtering, and then drying at a temperature of 60 ℃ for 7 h; mixing the pretreated polyvinyl alcohol fibers and seaweed fibers in a mass ratio of 1:1 to obtain composite fibers; cutting the composite fibers so that the length of the composite fibers is 3-6 mm; and then stirring and mixing the composite fibers and a steel fiber-mica powder composite.

[0070] Example 10

[0071] The anti-cracking composite material disclosed in the present application comprises polyvinyl alcohol fibers, a steel fiber-mica powder composite, sodium fluosilicate, polyacryloyl dimethyl ammonium taurate and sodium bicarbonate, the mass ratio of the polyvinyl alcohol fibers and the steel fiber-mica powder composite is 1:10, the sodium fluosilicate accounts for 1 wt% of the steel fiber-mica powder composite, the mass ratio of the polyacryloyl dimethyl ammonium taurate and the polyvinyl alcohol fibers is 2:1, and the sodium bicarbonate accounts for 25 wt% of the steel fiber-mica powder composite, the steel fiber-mica powder composite being prepared according to Preparation Example 2.

[0072] The preparation method of the anti-cracking composite material comprises the following steps: pretreating polyvinyl alcohol fibers, the pretreatment step being: soaking the polyvinyl alcohol fibers in acetone for 24 h, then suction filtering, and then drying at a temperature of 70 ℃ for 6 h; mixing the pretreated polyvinyl alcohol fibers and seaweed fibers in a mass ratio of 1:1 to obtain composite fibers; cutting the composite fibers so that the length of the composite fibers is 3-6 mm; and then stirring and mixing the composite fibers and a steel fiber-mica powder composite.

[0073] Example 11

[0074] The present application discloses an anti-cracking composite material comprising polyvinyl alcohol fiber, steel fiber-mica powder composite, sodium fluosilicate, polyacrylamide ammonium dimethyl taurate and sodium bicarbonate, the mass ratio of polyvinyl alcohol fiber and steel fiber-mica powder composite is 1:9, sodium fluosilicate accounts for 0.8wt% of the steel fiber-mica powder composite, the mass ratio of polyacrylamide ammonium dimethyl taurate and polyvinyl alcohol fiber is 1.5:1, sodium bicarbonate accounts for 20wt% of the steel fiber-mica powder composite, and the steel fiber-mica powder composite is prepared by Preparation Example 3.

[0075] The preparation method of the anti-cracking composite material comprises the following steps: pretreating the polyvinyl alcohol fiber, the pretreatment step being: soaking the polyvinyl alcohol fiber in acetone for 22h, then suction filtering, and then drying at a temperature of 65℃ for 7h; mixing the pretreated polyvinyl alcohol fiber and seaweed fiber in a mass ratio of 1:1 to obtain a composite fiber; cutting the composite fiber so that the length of the composite fiber is 3-6mm; and then stirring and mixing the composite fiber and the steel fiber-mica powder composite.

[0076] Comparative Example

[0077] Comparative Example 1

[0078] The difference from Example 1 is that the anti-cracking composite material using polyvinyl alcohol fiber and steel fiber as raw materials is used as a blank control group.

[0079] Comparative Example 2

[0080] The difference from Example 1 is that the polyvinyl alcohol fiber is replaced by polyurethane fiber.

[0081] Comparative Example 3

[0082] The difference from Example 1 is that the steel fiber-mica powder composite is replaced by a steel fiber-nano silicon dioxide composite, and the steel fiber-nano silicon dioxide composite is prepared by Preparation Example 4.

[0083] Comparative Example 4

[0084] The difference from Comparative Example 1 is that no polyvinyl alcohol fiber is added.

[0085] Comparative Example 5

[0086] The difference from Example 1 is that no polyvinyl alcohol fiber is added.

[0087] Performance detection test

[0088] Anti-cracking test (characterized by tensile strength, ultimate tensile strain): the anti-cracking admixture prepared from each example and the comparative example is prepared according to the standard of adding 1 kg of finished anti-cracking admixture in each cubic meter of concrete, and then the tensile strength and ultimate tensile strain of the sample are determined according to the standard GB / T50081-2019 "Standard for testing methods of mechanical properties of ordinary concrete", and the test results are shown in Table 1 below.

[0089] Table 1 test results of each example and the comparative example

[0090] Tensile strength / Mpa Limiting tensile strain / 10 -4 ]] Example 1 7.3 1.29 Example 2 7.6 1.34 Example 3 7.4 1.32 Example 4 7.3 1.30 Example 5 7.7 1.37 Example 6 7.9 1.42 Example 7 7.5 1.34 Example 8 7.7 1.38 Example 9 8.5 1.51 Example 10 8.9 1.56 Example 11 8.7 1.54 Comparative Example 1 6.8 1.18 Comparative Example 2 7.0 1.22 Comparative Example 3 7.1 1.25 Comparative Example 4 6.0 0.91 Comparative Example 5 6.1 0.94

[0091] In summary:

[0092] 1. It can be seen from the combination of Example 1 and Comparative Examples 1, 3 and Table 1 that the addition of steel fiber-mica powder composite in concrete can improve the anti-cracking performance of concrete, and the reason may be that the steel fibers form a structural network by overlapping with each other in the concrete, which improves the overall structural strength of the concrete and is beneficial to improve the anti-cracking performance of the concrete under load. The mica powder particles on the steel fiber extend into the surrounding concrete, which inhibits the relative sliding between the steel fiber and the concrete under external force, reduces the peeling of the steel fiber, and thus helps to reduce the cracking of the concrete.

[0093] 2. It can be seen from the combination of Example 1 and Comparative Examples 1-2 and Table 1 that the addition of polyvinyl alcohol fiber in concrete can improve the anti-cracking performance of concrete, and the reason may be that the polyvinyl alcohol fiber has low elongation and is uniformly dispersed in the concrete to play a role similar to a screen. The particle components are not easy to stretch the polyvinyl alcohol fiber, thereby inhibiting the sinking of the particle components in the concrete, improving the uniformity of the overall concrete, reducing the capillary channels formed by the overflow of water in the concrete matrix, and thus inhibiting the cracking of the concrete.

[0094] 3. It can be seen from the combination of Example 1 and Comparative Examples 1, 4-5 and Table 1 that the addition of steel fiber-mica powder composite and polyvinyl alcohol fiber in concrete is beneficial to synergistically improve the anti-cracking performance of concrete, and the reason may be that the mica powder is in a sheet structure and is randomly distributed after adhering to the surface of the steel fiber. After the polyvinyl alcohol fiber and the steel fiber-mica powder composite are added to the concrete and blended, the polyvinyl alcohol fiber and the steel fiber-mica powder composite are intertwined with each other during the stirring process, and the structure network inside the concrete is co-constructed. When the concrete is subjected to external force, it promotes the dispersion of directional stress and hinders the formation and development of cracks in the concrete, thereby further improving the anti-cracking performance of the concrete.

[0095] 4. As can be seen from the combination of Embodiment 1, 7 and Table 1, the crack resistance of the concrete can be improved by blending the seaweed fibers and the polyvinyl alcohol fibers, and the reason can be that the seaweed fibers become gelatinous when in contact with water, and after the concrete is solidified, the seaweed fibers and the polyvinyl alcohol fibers are bonded to the concrete matrix, anchoring effect is generated between the polyvinyl alcohol fibers and the concrete, the stability of the overall properties of the concrete is improved, and the crack resistance of the concrete is improved.

[0096] 5. As can be seen from the combination of Embodiment 1, 7-8 and Table 1, the crack resistance of the concrete can be improved by pretreating the polyvinyl alcohol fibers, and the reason can be that the polyvinyl alcohol fibers are pretreated to remove grease, waxy substances, pectin and other lipid substances on the surface of the polyvinyl alcohol fibers, and the defatted polyvinyl alcohol fibers are obtained, the defatted polyvinyl alcohol fibers are directly in contact with the concrete matrix, the friction between the polyvinyl alcohol fibers and the concrete matrix is increased, the anchoring effect between the polyvinyl alcohol fibers and the concrete is further improved, and the crack resistance of the concrete is improved.

[0097] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An anti- crack composite material, characterized by: The polyvinyl alcohol fiber and steel fiber-mica powder composite include a mass ratio of 1:(8-10), and the steel fiber-mica powder composite is prepared by spreading the steel fibers flat without overlapping, then smearing glue on the surface of the steel fibers, then pouring the mica powder into a sieve, placing the sieve above the steel fibers, shaking and moving the sieve back and forth to evenly spread the mica powder on the steel fibers, and drying the steel fibers at 45-55°C to obtain the steel fiber-mica powder composite.

2. The anti- crack material according to claim 1, wherein: The steel fiber-mica powder composite also includes sodium fluosilicate, which accounts for 0.5-1wt% of the steel fiber-mica powder composite.

3. The anti- crack composite material of claim 1, wherein: The steel fiber-mica powder composite also includes polyacryloyl dimethyl ammonium taurate, and the mass ratio of the polyacryloyl dimethyl ammonium taurate to the polyvinyl alcohol fiber is (1-2):

1.

4. The anti- crack material according to claim 1, wherein: The steel fiber-mica powder composite also includes sodium bicarbonate, which accounts for 15-25wt% of the steel fiber-mica powder composite.

5. The anti- crack material according to claim 1, wherein: The glue is epoxy resin ab glue.

6. A method for preparing a crack-resistant composite material, characterized in that, The method includes the following steps: blending polyvinyl alcohol fiber and seaweed fiber to obtain composite fibers, cutting the composite fibers so that the length of the composite fibers is 3-6mm, and then stirring and mixing the composite fibers and a steel fiber-mica powder composite, wherein the steel fiber-mica powder composite is prepared by spreading the steel fibers flat without overlapping, then smearing glue on the surface of the steel fibers, then pouring the mica powder into a sieve, placing the sieve above the steel fibers, shaking and moving the sieve back and forth to evenly spread the mica powder on the steel fibers, and drying the steel fibers at 45-55°C to obtain the steel fiber-mica powder composite.

7. The method of claim 6, wherein the method further comprises: The polyvinyl alcohol fiber is pretreated before blending with seaweed fiber, and the pretreatment step is: soaking the polyvinyl alcohol fiber in acetone for 20-24h, then suction filtering, and then drying at a temperature of 60-70°C for 6-7h.

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