An impact and wear resistant repair material and a method of making the same

Abstract

The application relates to the technical field of building repair materials, and particularly discloses an anti-impact and wear-resistant repair material and a preparation method thereof. The prepared repair material has excellent anti-erosion performance and wear resistance through optimization of the content of each component of raw materials. Silicate cement is used as a main cementing material to provide basic strength and adhesion; fly ash and silica powder are used to synergistically enhance compactness and durability; quartz sand is used as wear-resistant aggregate to improve compression resistance and wear resistance; composite modified carbon fiber is used to enhance toughness and impact resistance; redispersible emulsion powder is used to improve flexibility and adhesion; polycarboxylic acid water reducing agent is used to optimize fluidity and improve compactness; and a defoaming agent is used to reduce pore defects and ensure material uniformity. The repair material provided by the application is suitable for repair engineering in environments that need to bear mechanical impact or wear, and has good construction performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building repair materials, in particular to an anti-impact and wear-resistant repair material and a preparation method thereof. BACKGROUND

[0002] In the scenarios of water conservancy projects, coastal protection and water conveying pipelines, concrete structures are exposed to high-speed water flow containing sand and gravel for a long time, and face serious surface wear and impact damage problems. Sand and gravel particles repeatedly impact the concrete surface under the wrapping of water flow, not only causing the surface mortar to peel off and the aggregate to be exposed, but also forming impact craters and cracks on the structure surface, which further accelerates the internal steel corrosion and overall performance degradation. This persistent wear and local stress concentration phenomenon greatly shortens the service life of the concrete structure. Especially in harsh working conditions with high flow rate and much sediment, the anti-impact and wear-resistant performance of traditional concrete has been difficult to meet the engineering requirements, and it is urgent to develop a repair material with long-term protection capability.

[0003] At present, the repair mortar commonly used in engineering is mainly based on ordinary cement-based materials, and the hardness and toughness are difficult to balance, which is prone to brittle cracking or peeling under dynamic impact load. Although some modified mortars improve the adhesion by adding polymers or fibers, there are still problems such as insufficient interfacial bonding strength with concrete and time-dependent wear resistance.

[0004] Chinese patent document CN115073107A discloses a preparation method of an anti-impact and corrosion-resistant environment-friendly mortar. The method effectively improves the synergistic effect between raw materials, maximizes the optimization of the raw materials and their ratio of the cement mortar, and enhances the anti-impact and corrosion-resistant ability of the cement mortar. However, the wear resistance of the prepared mortar still needs to be further improved. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application aims to provide an anti-impact and wear-resistant repair material and a preparation method thereof. The prepared repair material has excellent mechanical properties, anti-erosion performance and wear resistance.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] An anti-impact and wear-resistant repair material is composed of the following raw materials by weight: 150-200 parts of Portland cement, 40-60 parts of fly ash, 360-480 parts of quartz sand, 25-50 parts of silicon powder, 15-25 parts of composite modified carbon fiber, 10-20 parts of redispersible latex powder, 10-15 parts of polycarboxylate superplasticizer, 0.5-1 part of defoaming agent, and 60-80 parts of water.

[0008] In the technical scheme disclosed in the application, the silicate cement is used as the main cementing material to provide basic strength, and the proportion of the silicate cement can be selected as 150 parts, 160 parts, 170 parts, 180 parts, 190 parts, 200 parts, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0009] In the technical scheme disclosed in the application, the fly ash is used as the active mineral admixture to participate in secondary hydration reaction, improve strength and durability, and the proportion of the fly ash can be selected as 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0010] In the technical scheme disclosed in the application, the quartz sand is used as the aggregate to mainly play a role of skeleton support, enhance the compressive strength and wear resistance of the material, and the proportion of the quartz sand can be selected as 360 parts, 370 parts, 380 parts, 390 parts, 400 parts, 410 parts, 420 parts, 430 parts, 440 parts, 450 parts, 460 parts, 470 parts, 480 parts, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0011] In the application, the quartz sand is three-level matched with 10-20 mesh, 20-40 mesh and 40-70 mesh, and the mass ratio of each level of the quartz sand is 1-2:1-2:1-2.

[0012] In the technical scheme disclosed in the application, the silicon powder is used as the active material to fill micropores and accelerate hydration, and plays a role of improving the compactness and early strength, and the proportion of the silicon powder can be selected as 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0013] In the technical scheme disclosed in the application, the proportion of the composite modified carbon fiber can be selected as 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0014] In the technical scheme disclosed in the application, the preparation method of the composite modified carbon fiber is as follows:

[0015] S1, the emulsifier and tertiary dodecanethiol are added to the deionized water, mixed uniformly, then styrene, hexafluorobutyl acrylate and vinyl triethoxysilane are added thereto, stirred uniformly, then heated to 50-60 DEG C, the initiator is added, and stirred to react to obtain a composite emulsion;

[0016] S2, dissolving the calcium salt and the zirconium salt in deionized water, then adding the pretreated carbon fiber into the solution, uniformly dispersing, adjusting the pH of the solution to 10-12, hydrothermal reaction, then drying, calcining and grinding to obtain the carbon fiber composite material;

[0017] S3, dispersing the carbon fiber composite material in the composite emulsion, adjusting the pH of the solution to 4-5, stirring, then centrifuging, washing and drying to obtain the composite modified carbon fiber.

[0018] Specifically, in step S1, the mass ratio of the emulsifier, tertiary dodecyl mercaptan, deionized water, styrene, hexafluorobutyl acrylate, vinyl triethoxysilane and initiator is 3-5:1-3:100-120:20-25:15-20:10-15:0.5-1.

[0019] More specifically, the emulsifier is selected from at least one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and alkyl phenol polyoxyethylene ether.

[0020] More specifically, the initiator is selected from persulfate, for example, ammonium persulfate, sodium persulfate or potassium persulfate.

[0021] In step S1, the styrene, hexafluorobutyl acrylate and vinyl triethoxysilane are copolymerized by emulsion polymerization to form a composite emulsion, wherein the styrene provides a rigid benzene ring structure, the fluorine-containing group is introduced by the hexafluorobutyl acrylate to improve the chemical stability and wear resistance of the material in the corrosive medium, and the fluorocarbon chain segment has a certain flexibility, which can absorb part of kinetic energy by elastic deformation of the molecular chain when impacted to reduce stress concentration; the siloxane group of the vinyl triethoxysilane can be hydrolyzed and condensed to chemically bond with the -OH on the surface of the carbon fiber composite material, thereby enhancing the interfacial bonding force between the composite emulsion and the carbon fiber.

[0022] Specifically, in step S2, the mass ratio of the calcium salt, the zirconium salt and the pretreated carbon fiber is 3-5:10:4-6.

[0023] The calcium salt is selected from soluble calcium salt, for example, calcium nitrate or calcium chloride.

[0024] The zirconium salt is selected from soluble zirconium salt, for example, zirconium nitrate, zirconium chloride or zirconyl nitrate.

[0025] Specifically, the preparation process of the pretreated carbon fiber is as follows: adding carbon fiber into sulfuric acid solution, heating and stirring to obtain the pretreated carbon fiber.

[0026] Specifically, in step S2, the temperature of the hydrothermal reaction is 150-180℃, for example, it can be selected as 150℃, 155℃, 160℃, 165℃, 170℃, 175℃, 180℃; the time of the hydrothermal reaction is 3-6h, for example, it can be selected as 3h, 3.5h, 4h, 4.5h, 5h, 5.5h, 6h, but not limited to the listed values, other values not listed in the value range are also applicable.

[0027] Specifically, in step S2, the calcination temperature is 900-1000℃, for example, it can be selected as 900℃, 920℃, 940℃, 950℃, 960℃, 980℃, 1000℃; the calcination time is 2-3h, for example, it can be selected as 2h, 2.5h, 3h, but not limited to the listed values, other values not listed in the value range are also applicable.

[0028] In step S2, CaZrO3 precursors are first formed on the surface of the pretreated carbon fiber by a hydrothermal method, and then calcination is performed to form a CaZrO3 phase on the surface of the carbon fiber. The CaZrO3 particles are dispersed on the surface of the carbon fiber as a hard phase, forming a rough structure, which enhances the mechanical interlocking force between the carbon fiber and the cement matrix, reduces interface slip, and improves the mechanical properties of the material. At the same time, it can also effectively reduce the wear of the carbon fiber, thereby improving the wear resistance of the material. In addition, CaZrO3 has very high stability to corrosive media in the airflow, further improving the erosion resistance of the carbon fiber.

[0029] Specifically, in step S3, the ratio of the amount of carbon fiber composite material to the amount of composite emulsion is 5-10g:100mL, for example, it can be selected as 5g:100mL, 6g:100mL, 7g:100mL, 8g:100mL, 9g:100mL, 10g:100mL, but not limited to the listed values, other values not listed in the value range are also applicable.

[0030] In step S3, stirring treatment is carried out under weak acidic conditions (pH 4-5). The hydrolysis of vinyltriethoxysilane is promoted in the acidic environment to form silicon hydroxyl groups (Si-OH), which chemically bond with the -OH on the surface of the carbon fiber composite material. The organic polymer is coated on the surface of the carbon fiber composite material, which not only improves the dispersibility of the carbon fiber in the cement matrix, but also effectively buffers the impact energy when under stress, reducing the interface defects between the carbon fiber and the matrix, thereby significantly improving the mechanical properties and wear resistance of the material.

[0031] In the technical scheme disclosed in the present application, the redispersible latex powder can enhance flexibility, adhesion and impermeability, and the amount of the redispersible latex powder can be selected from 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0032] In the technical scheme disclosed in the present application, the polycarboxylate superplasticizer can reduce the water-cement ratio without affecting the fluidity, and the amount of the polycarboxylate superplasticizer can be selected from 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0033] In the technical scheme disclosed in the present application, the defoaming agent can inhibit the generation of bubbles during the mixing process and avoid air hole defects, and the amount of the defoaming agent can be selected from 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0034] In the technical scheme disclosed in the present application, the amount of water can be selected from 180 parts, 190 parts, 200 parts, 210 parts, 220 parts, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0035] The present application also provides a preparation method of the above-mentioned impact-resistant and wear-resistant repair material, which comprises the following steps: weighing each raw material according to the formula amount, uniformly mixing silicate cement, fly ash, quartz sand, silicon powder and composite modified carbon fiber, then adding redispersible latex powder, polycarboxylate superplasticizer, defoaming agent and water thereto, and continuously mixing uniformly to obtain the impact-resistant and wear-resistant repair material.

[0036] Compared with the prior art, the present application has the following beneficial effects:

[0037] (1) The present application optimizes the content of each component of the raw material, and the prepared repair material has excellent anti-erosion performance and wear resistance, wherein the silicate cement serves as the main cementitious material to provide basic strength and adhesion; the fly ash and silicon powder synergistically enhance the compactness and durability; the quartz sand serves as the wear-resistant aggregate to improve the compression resistance and wear resistance; the composite modified carbon fiber enhances the toughness and impact resistance; the redispersible latex powder improves the flexibility and adhesion; the polycarboxylate superplasticizer optimizes the fluidity and improves the compactness; and the defoaming agent reduces the air hole defects and ensures the uniformity of the material. The repair material provided by the present application is suitable for repair engineering in environments requiring mechanical impact or wear, and has good construction performance.

[0038] (2) The present application first pretreats the carbon fiber, enhances the surface roughness of the carbon fiber, facilitates the subsequent loading of CaZrO3 particles, then disperses the CaZrO3 particles as hard phases on the surface of the carbon fiber to form a rough structure, enhances the mechanical interlocking force between the carbon fiber and the cement matrix, reduces the interface slip, improves the mechanical properties of the material, and can effectively reduce the abrasion of the carbon fiber, thereby improving the wear resistance of the material. In addition, CaZrO3 has very high stability to corrosive media in the airflow, further improving the erosion resistance of the carbon fiber; then the organic polymer is coated on the surface of the carbon fiber composite material, which not only improves the dispersibility of the carbon fiber in the cement matrix, but also effectively buffers the impact energy when stressed, reduces the interface defects between the carbon fiber and the matrix, thereby significantly improving the mechanical properties and wear resistance of the material. DETAILED DESCRIPTION

[0039] The present application will be further described in detail through specific preferred embodiments, but the present application is not limited to the following embodiments.

[0040] It should be noted that, unless otherwise specified, the chemical reagents involved in the present application are purchased through commercial channels.

[0041] The Portland cement used in the embodiments of the present application is P·O 42.5 grade;

[0042] Fly ash: first-class fly ash, mesh size is 400 mesh;

[0043] The quartz sand is three-level matched with 10-20 mesh, 20-40 mesh and 40-70 mesh, and the mass ratio of each grade of quartz sand is 1:1:1;

[0044] Silicon powder: mesh size is 800 mesh;

[0045] Carbon fiber: length is 9-13 mm, diameter is 7 μm;

[0046] The redispersible latex powder is from Hebei Haosuo Chemical Co., Ltd.;

[0047] The polycarboxylate superplasticizer is PC-1006 from Wuhan Huaxuan High-tech Co., Ltd.;

[0048] Defoaming agent: silicone defoaming agent BYK-088.

[0049] Example 1

[0050] A preparation method of an anti-erosion and wear-resistant repair material, comprising the following steps:

[0051] 180 parts of Portland cement, 50 parts of fly ash, 400 parts of quartz sand, 30 parts of silica powder and 20 parts of composite modified carbon fiber are uniformly mixed, then 15 parts of redispersible latex powder, 12 parts of polycarboxylic acid type water reducer, 0.8 parts of defoaming agent and 200 parts of water are added and uniformly mixed to obtain the impact-resistant and wear-resistant repair material.

[0052] The preparation method of the composite modified carbon fiber is as follows:

[0053] S1, 2g of sodium dodecyl sulfate, 2g of alkyl phenol polyoxyethylene ether OP-4 and 2g of tert-dodecyl mercaptan are added to 100g of deionized water, mixed uniformly, then 20g of styrene, 15g of hexafluorobutyl acrylate and 10g of vinyl triethoxysilane are added, stirred uniformly, then heated to 55℃, 0.8g of initiator ammonium persulfate is added, stirred at 55℃ for 3h, cooled to room temperature after the reaction is completed, and the composite emulsion is obtained;

[0054] S2, 10g of carbon fiber is added to 100mL of 40wt% sulfuric acid solution, stirred at 60℃ for 3h, filtered, washed and dried to obtain the pretreated carbon fiber;

[0055] S3, 3g of calcium nitrate and 10g of zirconium nitrate are dissolved in 100mL of deionized water, then 5g of pretreated carbon fiber is added and dispersed uniformly, the pH of the solution is adjusted to 10 with NaOH solution, hydrothermal reaction is carried out at 150℃ for 6h, then filtration and drying are carried out, calcination is carried out at 900℃ for 3h in a nitrogen atmosphere, grinding is carried out, and the carbon fiber composite material is obtained;

[0056] S4, 8g of carbon fiber composite material is dispersed in 100mL of composite emulsion, the pH of the solution is adjusted to 4 with dilute hydrochloric acid, stirring treatment is carried out at room temperature for 3h, then centrifugation, washing and drying are carried out, and the composite modified carbon fiber is obtained.

[0057] Example 2

[0058] A preparation method of an impact-resistant and wear-resistant repair material, comprising the following steps:

[0059] 150 parts of Portland cement, 40 parts of fly ash, 360 parts of quartz sand, 25 parts of silica powder and 15 parts of composite modified carbon fiber are uniformly mixed, then 10 parts of redispersible latex powder, 10 parts of polycarboxylic acid type water reducer, 0.5 parts of defoaming agent and 180 parts of water are added and uniformly mixed to obtain the impact-resistant and wear-resistant repair material.

[0060] The preparation method of the composite modified carbon fiber is as follows:

[0061] S1, 1g of sodium dodecyl sulfate, 2g of alkylphenol polyoxyethylene ether OP-4 and 3g of tert-dodecyl mercaptan are added to 100g of deionized water, mixed uniformly, then 25g of styrene, 15g of hexafluorobutyl acrylate and 15g of vinyl triethoxysilane are added, stirred uniformly, then heated to 55℃, 1g of initiator ammonium persulfate is added, stirred at 55℃ for 3h, after the reaction is completed, cooled to room temperature to obtain a composite emulsion;

[0062] S2, 10g of carbon fiber is added to 100mL of 40wt% sulfuric acid solution, stirred at 60℃ for 3h, filtered, washed and dried to obtain pretreated carbon fiber;

[0063] S3, 5g of calcium nitrate and 10g of zirconium nitrate are dissolved in 100mL of deionized water, then 6g of pretreated carbon fiber is added, dispersed uniformly, the pH of the solution is adjusted to 10 with NaOH solution, hydrothermal reaction is carried out at 150℃ for 6h, then filtration and drying are carried out, calcination is carried out at 900℃ for 3h in a nitrogen atmosphere, grinding to obtain carbon fiber composite material;

[0064] S4, 5g of carbon fiber composite material is dispersed in 100mL of composite emulsion, the pH of the solution is adjusted to 4 with dilute hydrochloric acid, stirred at room temperature for 3h, then centrifuged, washed and dried to obtain composite modified carbon fiber.

[0065] Example 3

[0066] A preparation method of an impact-resistant wear-resistant repair material, comprising the following steps:

[0067] 200 parts of Portland cement, 60 parts of fly ash, 480 parts of quartz sand, 50 parts of silica powder and 25 parts of composite modified carbon fiber are uniformly mixed, then 20 parts of redispersible latex powder, 15 parts of polycarboxylic acid type water reducer, 1 part of defoaming agent and 220 parts of water are added and uniformly mixed to obtain an impact-resistant wear-resistant repair material.

[0068] The preparation method of the composite modified carbon fiber is as follows:

[0069] S1, 1g of sodium dodecyl sulfate, 2g of alkylphenol polyoxyethylene ether OP-4 and 3g of tert-dodecyl mercaptan are added to 100g of deionized water, mixed uniformly, then 25g of styrene, 15g of hexafluorobutyl acrylate and 15g of vinyl triethoxysilane are added, stirred uniformly, then heated to 55℃, 1g of initiator ammonium persulfate is added, stirred at 55℃ for 3h, after the reaction is completed, cooled to room temperature to obtain a composite emulsion;

[0070] S2, 10 g of carbon fiber was added into 100 mL of 40 wt% sulfuric acid solution, stirred at 60°C for 3 h, and then filtered, washed, and dried to obtain pretreated carbon fiber;

[0071] S3, 5 g of calcium nitrate and 10 g of zirconium nitrate were dissolved in 100 mL of deionized water, and then 6 g of the pretreated carbon fiber was added and uniformly dispersed. The pH of the solution was adjusted to 10 with a NaOH solution, and then the solution was hydrothermally reacted at 150°C for 6 h. Subsequently, the solution was filtered and dried, and then calcined at 900°C for 3 h in a nitrogen atmosphere. Finally, the solution was ground to obtain a carbon fiber composite material;

[0072] S4, 10 g of the carbon fiber composite material was dispersed in 100 mL of the composite emulsion, and the pH of the solution was adjusted to 4 with dilute hydrochloric acid. The solution was stirred at room temperature for 3 h, and then centrifuged, washed, and dried to obtain a composite modified carbon fiber.

[0073] Comparative Example 1

[0074] A method for preparing an impact-resistant and wear-resistant repair material, comprising the following steps:

[0075] 180 parts of Portland cement, 50 parts of fly ash, 400 parts of quartz sand, 30 parts of silica powder, and 20 parts of the composite modified carbon fiber were uniformly mixed, and then 15 parts of redispersible latex powder, 12 parts of polycarboxylic acid-based water reducer, 0.8 parts of defoaming agent, and 200 parts of water were added and uniformly mixed to obtain the impact-resistant and wear-resistant repair material.

[0076] The preparation method of the composite modified carbon fiber is as follows:

[0077] S1, 2 g of sodium dodecyl sulfate, 2 g of alkylphenol polyoxyethylene ether OP-4, and 2 g of tert-dodecyl mercaptan were added to 100 g of deionized water and uniformly mixed, and then 20 g of styrene, 15 g of hexafluorobutyl acrylate, and 10 g of vinyl triethoxysilane were added and uniformly stirred. Then, the solution was heated to 55°C, 0.8 g of ammonium persulfate was added, and the solution was stirred at 55°C for 3 h. After the reaction was completed, the solution was cooled to room temperature to obtain a composite emulsion;

[0078] S2, 10 g of carbon fiber was added into 100 mL of 40 wt% sulfuric acid solution, stirred at 60°C for 3 h, and then filtered, washed, and dried to obtain pretreated carbon fiber;

[0079] S3, 8 g of the pretreated carbon fiber was dispersed in 100 mL of the composite emulsion, and the pH of the solution was adjusted to 4 with dilute hydrochloric acid. The solution was stirred at room temperature for 3 h, and then centrifuged, washed, and dried to obtain a composite modified carbon fiber.

[0080] Comparative Example 1 and Example 1 do not load CaZrO3 on the pretreated carbon fiber.

[0081] Comparative Example 2

[0082] A preparation method of an impact-resistant and wear-resistant repair material, comprising the following steps:

[0083] 180 parts of Portland cement, 50 parts of fly ash, 400 parts of quartz sand, 30 parts of silica powder and 20 parts of composite modified carbon fiber are uniformly mixed, then 15 parts of redispersible latex powder, 12 parts of polycarboxylic acid type water reducing agent, 0.8 parts of defoaming agent and 200 parts of water are added and uniformly mixed to obtain the impact-resistant and wear-resistant repair material.

[0084] The preparation method of the composite modified carbon fiber is as follows:

[0085] S1, 10g of carbon fiber is added to 100mL of 40wt% sulfuric acid solution, stirred and treated at 60℃ for 3h, filtered, washed and dried to obtain pretreated carbon fiber;

[0086] S2, 3g of calcium nitrate and 10g of zirconium nitrate are dissolved in 100mL of deionized water, then 5g of pretreated carbon fiber is added and uniformly dispersed, the pH of the solution is adjusted to 10 with NaOH solution, hydrothermal reaction is carried out at 150℃ for 6h, followed by filtration and drying, calcination is carried out at 900℃ for 3h in a nitrogen atmosphere, and grinding to obtain the composite modified carbon fiber.

[0087] Comparative Example 2 and Example 1 are compared, only the pretreated carbon fiber is loaded with CaZrO3 treatment.

[0088] Comparative Example 3

[0089] A preparation method of an impact-resistant and wear-resistant repair material, comprising the following steps:

[0090] 180 parts of Portland cement, 50 parts of fly ash, 400 parts of quartz sand, 30 parts of silica powder and 20 parts of composite modified carbon fiber are uniformly mixed, then 15 parts of redispersible latex powder, 12 parts of polycarboxylic acid type water reducing agent, 0.8 parts of defoaming agent and 200 parts of water are added and uniformly mixed to obtain the impact-resistant and wear-resistant repair material.

[0091] The preparation method of the composite modified carbon fiber is as follows:

[0092] S1, 2g of sodium dodecyl sulfate, 2g of alkyl phenol polyoxyethylene ether OP-4 and 2g of tert-dodecyl mercaptan are added to 100g of deionized water and uniformly mixed, then 20g of styrene, 15g of acrylic acid and 10g of vinyl triethoxysilane are added and uniformly stirred, then the temperature is raised to 55℃, 0.8g of initiator ammonium persulfate is added, and stirring reaction is carried out at 55℃ for 3h, after the reaction is completed, the temperature is cooled to room temperature to obtain the composite emulsion;

[0093] S2, 10 g of carbon fiber was added to 100 mL of 40 wt% sulfuric acid solution, stirred at 60°C for 3 h, and then filtered, washed, and dried to obtain a pretreated carbon fiber;

[0094] S3, 3 g of calcium nitrate and 10 g of zirconium nitrate were dissolved in 100 mL of deionized water, and then 5 g of the pretreated carbon fiber was added and dispersed uniformly, and the pH of the solution was adjusted to 10 with a NaOH solution, and then hydrothermal reaction was performed at 150°C for 6 h, followed by filtration and drying, and then calcination was performed at 900°C for 3 h in a nitrogen atmosphere, and then grinding was performed to obtain a carbon fiber composite material;

[0095] S4, 8 g of the carbon fiber composite material was dispersed in 100 mL of a composite emulsion, the pH of the solution was adjusted to 4 with dilute hydrochloric acid, and stirring was performed at room temperature for 3 h, and then centrifugation, washing, and drying were performed to obtain a composite modified carbon fiber.

[0096] In Comparative Example 3, acrylic acid was used instead of hexafluorobutyl acrylate.

[0097] The repair materials prepared in Examples 1-3 and Comparative Examples 1-3 were prepared into test blocks, and then performance detection was performed, as follows:

[0098] Compressive strength and flexural strength: the test blocks were cured for 28 d under standard curing conditions, and then detection was performed in accordance with GB / T50081-2019 "Standard Test Methods for Physical and Mechanical Properties of Concrete";

[0099] Erosion resistance: the underwater steel ball method in DL / T5150-2001 "Test Code for Hydraulic Concrete" was used for testing;

[0100] Abrasion resistance testing: abrasion resistance testing was performed using a TMS-04 type cement mortar / concrete abrasion tester with a flower wheel grinding head in accordance with the provisions of "Test Code for Highway Engineering Cement and Cement Concrete" JTGE30-2005 and "Test Method for Abrasion Resistance of Cement Mortar" JC / T421-1991, and the abrasion resistance after 28 d under standard curing conditions was calculated; the test results are shown in Table 1.

[0101] Table 1: Performance test results of each group

[0102]

[0103] Finally, it should be noted that the above examples do not limit the present application in any form. For those skilled in the art, some modifications and improvements can be made on the basis of the present application. Therefore, any modification or improvement made without departing from the spirit of the present application shall fall within the scope of the present application.

Claims

1. An impact and wear resistant repair material, characterized in that, It is composed of the following raw materials by weight: Portland cement 150-200 parts, fly ash 40-60 parts, quartz sand 360-480 parts, silicon powder 25-50 parts, composite modified carbon fiber 15-25 parts, re-dispersible latex powder 10-20 parts, polycarboxylic acid type water reducer 10-15 parts, defoaming agent 0.5-1 part, and water 180-220 parts; The preparation method of the composite modified carbon fiber is as follows: S1, the emulsifier and tert-dodecyl mercaptan are added to deionized water, mixed uniformly, then styrene, hexafluorobutyl acrylate and vinyl triethoxysilane are added thereto, stirred uniformly, then heated to 50-60 DEG C, the initiator is added, stirred and reacted to obtain a composite emulsion; S2, the calcium salt and zirconium salt are dissolved in deionized water, then the pretreated carbon fiber is added thereto, dispersed uniformly, the pH of the solution is adjusted to 10-12, hydrothermal reaction is carried out, then drying, calcination and grinding are carried out to obtain a carbon fiber composite material; S3, the carbon fiber composite material is dispersed in the composite emulsion, the pH of the solution is adjusted to 4-5, stirred and treated, then centrifuged, washed and dried to obtain the composite modified carbon fiber; In step S1, the mass ratio of the emulsifier, tert-dodecyl mercaptan, deionized water, styrene, hexafluorobutyl acrylate, vinyl triethoxysilane and initiator is 3-5:1-3:100-120:20-25:15-20:10-15:0.5-1; In step S2, the mass ratio of the calcium salt, zirconium salt and pretreated carbon fiber is 3-5:10:4-6; The preparation process of the pretreated carbon fiber is as follows: the carbon fiber is added to a sulfuric acid solution, heated and stirred to obtain the pretreated carbon fiber; In step S3, the amount ratio of the carbon fiber composite material to the composite emulsion is 5-10g:100mL.

2. The impact and abrasive wear repair material of claim 1, wherein, In step S1, the emulsifier is selected from at least one of sodium dodecyl sulfate and alkylphenol polyoxyethylene ether.

3. The impacto-resistant wear repair material of claim 1, wherein, In step S1, the initiator is selected from persulfate.

4. The impacto resistant wear repair material of claim 1, wherein, In step S2, the temperature of the hydrothermal reaction is 150-180 DEG C, and the time of the hydrothermal reaction is 3-6h.

5. The impacto resistant wear repair material of claim 1, wherein, In step S2, the calcination temperature is 900-1000 DEG C, and the calcination time is 2-3h.

6. The method of claim 1-5, wherein the impact resistant wear repair material is prepared by the steps of: The method comprises the following steps: weighing each raw material according to the formula amount, mixing the Portland cement, fly ash, quartz sand, silicon powder and composite modified carbon fiber uniformly, then adding the re-dispersible latex powder, polycarboxylic acid type water reducer, defoaming agent and water thereto, and continuing to mix uniformly to obtain the impact-resistant and wear-resistant repair material.

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