Fiber-toughened high-strength concrete and processing technology thereof

Abstract

The invention discloses fiber-toughened high-strength concrete and a processing technology thereof, and relates to the technical field of concrete materials. The processing technology comprises the following steps: S1, fiber pretreatment; s2, dry material premixing; s3, performing primary stirring; and S4, secondary stirring. Wherein S1 specifically comprises the following steps: S11: (1) carrying out modification treatment on steel fibers by adopting 3-aminopropyltriethoxysilane, so as to obtain aminated steel fibers; (2) after carboxymethyl cellulose reacts with 4-amino-1, 5-naphthalenedisulfonic acid sodium salt, aminated steel fibers and polyamide-650 are sequentially added, stirring reaction is conducted, and modified steel fibers are obtained; s12: (1) uniformly mixing epoxy resin, a surfactant, a defoaming agent, polyamide-650 and water to obtain a waterborne epoxy emulsion; and (2) carrying out atomization spraying treatment on the polyester fiber by adopting a waterborne epoxy emulsion to obtain the modified polyester fiber.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete materials, and particularly relates to a fiber-toughened high-strength concrete and a processing technology thereof. BACKGROUND

[0002] As a new generation of engineering material, ultra-high performance concrete (UHPC) has become the core material in the fields of long-span bridges, super high-rise buildings, special engineering, etc. with its ultra-high strength, high durability and excellent crack resistance, and its performance directly determines the safety level and service life of major projects. With the increasing requirements of modern engineering on structural lightweight, long service life and disaster resistance, the existing UHPC still faces key technical bottlenecks: although high compressive strength is achieved by adding low water-binder ratio and high-activity admixture, there are still problems of insufficient flexural toughness and interface bonding efficiency, which restricts its application in complex stress scenarios.

[0003] Therefore, in view of the performance optimization requirement of UHPC, it is of great engineering value and market prospect to develop a fiber-toughened high-strength concrete. SUMMARY

[0004] The present application aims to provide a fiber-toughened high-strength concrete and a processing technology thereof to solve the problems in the background.

[0005] In order to solve the above technical problems, the present application provides the following technical solutions:

[0006] A processing technology of a fiber-toughened high-strength concrete, comprising the following steps:

[0007] S1: fiber pretreatment:

[0008] S11: (1) modifying the steel fiber by using 3-aminopropyl triethoxysilane to obtain an aminated steel fiber;

[0009] (2) reacting carboxymethyl cellulose with 4-amino-1,5-naphthalene disulfonic acid sodium, and then adding the aminated steel fiber and polyamide-650 in sequence, and stirring to react to obtain modified steel fiber;

[0010] S12: (1) adding epoxy resin, surfactant, defoaming agent, polyamide-650 and water into a stirrer to stir and mix to obtain a water-based epoxy emulsion;

[0011] (2) performing atomization spraying treatment on the polyester fiber by using the water-based epoxy emulsion to obtain modified polyester fiber;

[0012] S2: dry material premixing: adding cement, silica fume, fine sand and fly ash into a stirrer, stirring and mixing for 60-180s to obtain dry mixed materials;

[0013] S3: primary stirring: adding 70~80% of the total water and all water reducing agent to the dry mixed materials, and stirring and mixing for 120~240s to obtain a mixed slurry;

[0014] S4: secondary stirring: adding modified steel fibers to the mixed slurry, stirring and mixing for 60~180s; then adding modified polyester fibers, stirring and mixing for 60~180s; finally adding the remaining water, and continuing to stir and mix for 60~90s to obtain the fiber-reinforced high-strength concrete.

[0015] Further, the fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: cement 110~125 parts, silica fume 15~25 parts, fine sand 95~115 parts, fly ash 15~25 parts, water reducing agent 3~5 parts, modified steel fiber 10~20 parts, modified polyester fiber 5~10 parts, and water 22~30 parts.

[0016] Further, the cement is P.O 52.5 grade cement.

[0017] Further, the silica fume has a bulk density ≥300 kg / m3 and a silicon dioxide content ≥92%.

[0018] Further, the fine sand has a particle size of 0.1~0.5mm.

[0019] Further, the fly ash is I-class fly ash.

[0020] Further, the water reducing agent is a polycarboxylic acid water reducing agent with a water reducing rate ≥25%.

[0021] Further, the preparation method of the modified steel fiber is as follows: (1) adding 3-aminopropyl triethoxysilane to a 70~80wt% ethanol aqueous solution, stirring and mixing for 30~60min to obtain an amino silane hydrolysate; (2) adding steel fibers to the amino silane hydrolysate, stirring and mixing at 55~65℃ for 1~3h, and then filtering, washing, and drying to obtain aminated steel fibers; (3) adding carboxymethyl cellulose, 4-amino-1,5-naphthalene disulfonic acid sodium, and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide to a 70~80wt% ethanol aqueous solution, ultrasonically dispersing for 10~20min, then stirring and heating to 40~50℃ for 2~4h of reaction to obtain a modified cellulose dispersion; (4) adding the aminated steel fibers to the modified cellulose dispersion, ultrasonically dispersing for 10~30min, then adding polyamide-650 thereto, stirring and mixing for 1~3h, and then filtering, washing, and drying to obtain the modified steel fiber.

[0022] Further, the amount of 3-aminopropyl triethoxysilane and the ethanol aqueous solution is (2~4)mL:100mL.

[0023] Furthermore, the ratio of the amounts of steel fiber and aminosilane hydrolysate is 1g:(5~10)mL.

[0024] Furthermore, the ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and the aqueous ethanol solution is 1g:(0.1~0.2)g:(0.1~0.2)g:(20~30)mL.

[0025] Furthermore, the dosage relationship of the aminated steel fiber, modified cellulose dispersion, and polyamide-650 is 1g:(5~10)mL:(0.01~0.02)g.

[0026] Furthermore, the steel fiber is obtained by blending fibers in the following mass fractions: 20-40 wt% corrugated steel fiber, 40-60 wt% hooked steel fiber, and 5-20 wt% straight steel fiber; its length is 9-15 mm and its diameter is 0.1-0.3 mm.

[0027] In this invention, steel fibers are first modified with 3-aminopropyltriethoxysilane to obtain aminated steel fibers. Then, a portion of the -COOH in carboxymethyl cellulose undergoes an amidation reaction with the -NH2 in sodium 4-amino-1,5-naphthalenedisulfonate, introducing -SO3- onto the carboxymethyl cellulose. Next, aminated steel fibers are added, and the -NH2 on the aminated steel fibers reacts with the remaining -COOH on the carboxymethyl cellulose, thereby binding the carboxymethyl cellulose to the steel fibers. Finally, polyamide-650 is added. Polyamide-650 contains -NH2 and -CONH-. On the one hand, -NH2 can continue to react with the remaining -COOH, and on the other hand, it can form hydrogen bonds with the -NH2 on the aminated steel fibers, ultimately preparing a stable modified steel fiber.

[0028] Further, the preparation method of the modified polyester fiber is as follows: (1) at 80~90℃, epoxy resin, surfactant and defoamer are stirred and mixed for 1~2h to obtain a mixture; (2) after heating water to 80~90℃, it is added dropwise to the mixture while stirring at a stirring speed of 300~500rpm. The addition is completed within 1~2h. After the addition is completed, polyamide-650 is added and stirring is continued for 10~30min to obtain an aqueous epoxy emulsion; (3) polyester fiber is added to a mixer and the aqueous epoxy emulsion is sprayed into it while stirring. After drying, the modified polyester fiber is obtained.

[0029] Further, the mass ratio of the epoxy resin, surfactant, defoamer, polyamide-650, and water is (3.5~4.5):(0.2~0.4):(0.03~0.05):(2~3):(12~15).

[0030] Furthermore, the epoxy resin is an aqueous epoxy resin.

[0031] Furthermore, the surfactant is an alkylphenol polyoxyethylene ether type surfactant.

[0032] Furthermore, the defoamer is an organosilicon water-based defoamer.

[0033] In this invention, a water-based epoxy emulsion is used to treat polyester fibers, with polyamide-650 used as a curing agent. After modification, the dispersibility and binding strength of the polyester fibers are enhanced.

[0034] Furthermore, the operating parameters of the atomizing spray are: atomization pressure of 0.2~0.5MPa, droplet diameter of 20~50μm, and spray volume of 10~20wt% of the polyester fiber weight.

[0035] Furthermore, the polyester fiber is a spiral polyester fiber, specifically a spiral polyvinyl alcohol fiber; its length is 9~15mm and its diameter is 0.1~0.3mm.

[0036] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0037] (1) The present invention modifies steel fibers. The modified steel fibers are based on carboxymethyl cellulose and polyamide-650 as core modifying components, which together improve the application effect of steel fibers in concrete. Carboxymethyl cellulose, as a functional carrier, can significantly improve the hydrophilicity and electrostatic repulsion of steel fibers after grafting sulfonic acid groups, thereby improving its dispersibility in concrete. Through the introduction of -SO3-, -OH and other groups, it can form chemical bonds with cement hydration products, which can strengthen the fiber-matrix interface bonding. The addition of polyamide-650 can greatly improve the bonding stability between carboxymethyl cellulose and steel fibers. In addition, its addition also introduces abundant -CONH- groups, which on the one hand enhance the wettability of steel fibers and cement paste, and on the other hand, hydrolyze into carboxyl groups in the later stage of hydration, slowly releasing the water trapped between particles, reducing the aggregation of cementitious materials, delaying water evaporation, and reducing drying shrinkage cracks.

[0038] (2) In order to further improve the mechanical properties of concrete, the steel fibers are reinforced by a combination of corrugated steel fibers, hooked steel fibers, and straight steel fibers. Corrugated steel fibers enhance pull-out resistance and delay slippage under stress; hooked steel fibers enhance mechanical interlocking force and enhance the anchorage between steel fibers and concrete; straight steel fibers fill the gaps, assist in forming a spatial network, and improve the uniformity of fiber distribution. By combining the three, the mechanical properties of concrete are comprehensively improved by taking into account "pull-out resistance, anchorage, and space".

[0039] (3) In order to further improve the mechanical properties of concrete and based on cost considerations, spiral polyester fibers are introduced to work together with steel fibers to toughen and strengthen the concrete. The spiral structure naturally ensures the mechanical interlocking force between the fiber and the concrete. In this invention, water-based epoxy emulsion is used to modify the polyester fibers, forming a uniform coating on the surface of the polyester fibers containing -OH, -CONH- and other groups. After modification, the wettability of the polyester fibers is improved and the affinity with cement paste is enhanced, making them easier to disperse. Similarly, in the later stage of hydration, -CONH- hydrolyzes into carboxyl groups, which can also slowly release the water trapped between particles, reduce the aggregation of cementitious materials, delay water evaporation, and reduce drying shrinkage cracks.

[0040] In summary, this invention significantly improves the mechanical and other properties of concrete by combining different types of steel fibers, modifying steel fibers, modifying polyester fibers, and synergistically modifying steel fibers with modified polyester fibers. Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that the following quantities are by weight, and there are no special restrictions on the suppliers of all raw materials involved in this invention. Exemplary examples include:

[0043] In the following embodiments, the corrugated steel fiber, model LSF0213, has a length of 13mm and a diameter of 0.2mm; the hooked steel fiber, model GSF0213, has a length of 13mm and a diameter of 0.2mm; and the straight steel fiber, model WSF0213, has a length of 13mm and a diameter of 0.2mm; all were purchased from Ganzhou Daye Metal Fiber.

[0044] Spiral polyvinyl alcohol fiber, 13mm in length and 0.2mm in diameter, was purchased from Shandong Hengtai New Material Technology Co., Ltd.

[0045] Polycarboxylate superplasticizer, model PCA®-I; polyamide-650, model HS-650; alkylphenol polyoxyethylene ether surfactant, model OP-10; silicone waterborne defoamer, model LD-230; all purchased from Jiangsu Subote New Material Co., Ltd.

[0046] Carboxymethyl cellulose, purity ≥99.5%, purchased from Hubei Yongkuo Technology Co., Ltd.

[0047] Sodium 4-amino-1,5-naphthalenedisulfonate, purity ≥98%, CAS No. 85328-80-9, purchased from TCI (Shanghai) Chemical Industry Development Co., Ltd.

[0048] Waterborne epoxy resin, purity ≥99.99%, model number HongLi®2055, Zhejiang Hongli New Material Co., Ltd.; all other raw materials are commercially available; each part by weight is 200g.

[0049] Example 1: A processing technology for fiber-reinforced high-strength concrete:

[0050] S1: Fiber pretreatment:

[0051] S11: Preparation of modified steel fibers: (1) Add 3-aminopropyltriethoxysilane to a 75wt% aqueous ethanol solution and stir for 45 min to obtain an aminosilane hydrolysate. The ratio of the amounts of 3-aminopropyltriethoxysilane and the aqueous ethanol solution is 3 mL: 100 mL; (2) Add steel fibers (obtained by compounding fibers of the following mass fractions: 30 wt% corrugated steel fibers, 60 wt% hooked steel fibers, and 10 wt% straight steel fibers) to the aminosilane hydrolysate and stir for 2 h at 60 °C. After filtration, washing, and drying, amino-modified steel fibers are obtained. The ratio of the amounts of steel fibers and the aminosilane hydrolysate is 1 g: 10 mL; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, and 1-ethyl-3- (3-Dimethylaminopropyl)carbodiimide was added to a 75wt% ethanol aqueous solution, ultrasonically dispersed for 15 min, and then stirred and heated to 45℃ for 3 h to obtain a modified cellulose dispersion. The ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and ethanol aqueous solution was 1 g: 0.15 g: 0.15 g: 25 mL; (4) Aminated steel fiber was added to the modified cellulose dispersion, ultrasonically dispersed for 20 min, and then polyamide-650 was added to it. The mixture was stirred and mixed for 2 h, filtered, washed, and dried to obtain modified steel fiber. The ratio of the amounts of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was 1 g: 7.5 mL: 0.015 g;

[0052] S12: Preparation of modified polyester fiber: (1) At 85°C, waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (2) Water is heated to 85°C and then added dropwise to the mixture while stirring at a speed of 400rpm. The addition is completed within 1.5h. After the addition is completed, polyamide-650 is added and stirring is continued for 20min to obtain a waterborne epoxy emulsion, wherein the waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are mixed for 1.5h to obtain a mixture; (3) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (4) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (5) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (6) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (7) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (8) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (9) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (10) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (1 10. The mass ratio of organosilicon water-based defoamer, polyamide-650, and water is 4:0.3:0.04:2.5:14; (3) Add spiral polyvinyl alcohol fiber into a mixer and stir at a stirring speed of 150 rpm. Atomize and spray water-based epoxy emulsion into it (the working parameters of atomization spray are: atomization pressure of 0.4 MPa, droplet diameter of 40 μm, and spray amount of 15 wt% of the weight of spiral polyvinyl alcohol fiber). After drying, modified polyester fiber is obtained.

[0053] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0054] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0055] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0056] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 15 parts modified steel fiber, 8 parts modified polyester fiber, and 25 parts water.

[0057] Example 2: A processing technology for fiber-reinforced high-strength concrete:

[0058] Example 2 is based on Example 1, but the ratio of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was adjusted from 1g:7.5mL:0.015g to 1g:5mL:0.01g, while other processes remained unchanged. Specifically:

[0059] S1: Fiber pretreatment:

[0060] S11: Preparation of modified steel fibers: (1) Add 3-aminopropyltriethoxysilane to a 75wt% aqueous ethanol solution and stir for 45 min to obtain an aminosilane hydrolysate. The ratio of the amounts of 3-aminopropyltriethoxysilane and the aqueous ethanol solution is 3 mL: 100 mL; (2) Add steel fibers (obtained by compounding fibers of the following mass fractions: 30 wt% corrugated steel fibers, 60 wt% hooked steel fibers, and 10 wt% straight steel fibers) to the aminosilane hydrolysate and stir for 2 h at 60 °C. After filtration, washing, and drying, amino-modified steel fibers are obtained. The ratio of the amounts of steel fibers and the aminosilane hydrolysate is 1 g: 10 mL; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, and 1-ethyl- 3-(3-dimethylaminopropyl)carbodiimide was added to a 75wt% ethanol aqueous solution, ultrasonically dispersed for 15 min, and then stirred and heated to 45℃ for 3 h to obtain a modified cellulose dispersion. The ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and ethanol aqueous solution was 1 g: 0.15 g: 0.15 g: 25 mL; (4) Aminated steel fiber was added to the modified cellulose dispersion, ultrasonically dispersed for 20 min, and then polyamide-650 was added to it. The mixture was stirred and mixed for 2 h, filtered, washed, and dried to obtain modified steel fiber. The ratio of the amounts of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was 1 g: 5 mL: 0.01 g;

[0061] S12: Preparation of modified polyester fiber: (1) At 85°C, waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (2) Water is heated to 85°C and then added dropwise to the mixture while stirring at a speed of 400rpm. The addition is completed within 1.5h. After the addition is completed, polyamide-650 is added and stirring is continued for 20min to obtain a waterborne epoxy emulsion, wherein the waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are mixed for 1.5h to obtain a mixture; (3) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (4) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (5) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (6) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (7) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (8) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (9) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (10) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (1 10. The mass ratio of organosilicon water-based defoamer, polyamide-650, and water is 4:0.3:0.04:2.5:14; (3) Add spiral polyvinyl alcohol fiber into a mixer and stir at a stirring speed of 150 rpm. Atomize and spray water-based epoxy emulsion into it (the working parameters of atomization spray are: atomization pressure of 0.4 MPa, droplet diameter of 40 μm, and spray amount of 15 wt% of the weight of spiral polyvinyl alcohol fiber). After drying, modified polyester fiber is obtained.

[0062] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0063] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0064] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0065] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 15 parts modified steel fiber, 8 parts modified polyester fiber, and 25 parts water.

[0066] Example 3: A processing technology for fiber-reinforced high-strength concrete:

[0067] Example 3 is based on Example 1, but the ratio of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was adjusted from 1g:7.5mL:0.015g to 1g:10mL:0.02g, while other processes remained unchanged. Specifically:

[0068] S1: Fiber pretreatment:

[0069] S11: Preparation of modified steel fibers: (1) Add 3-aminopropyltriethoxysilane to a 75wt% aqueous ethanol solution and stir for 45 min to obtain an aminosilane hydrolysate. The ratio of the amounts of 3-aminopropyltriethoxysilane and the aqueous ethanol solution is 3 mL: 100 mL; (2) Add steel fibers (obtained by compounding fibers of the following mass fractions: 30 wt% corrugated steel fibers, 60 wt% hooked steel fibers, and 10 wt% straight steel fibers) to the aminosilane hydrolysate and stir for 2 h at 60 °C. After filtration, washing, and drying, amino-modified steel fibers are obtained. The ratio of the amounts of steel fibers and the aminosilane hydrolysate is 1 g: 10 mL; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, and 1-ethyl-3 -(3-dimethylaminopropyl)carbodiimide was added to a 75wt% ethanol aqueous solution, ultrasonically dispersed for 15 min, and then stirred and heated to 45℃ for 3 h to obtain a modified cellulose dispersion. The ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and ethanol aqueous solution was 1 g: 0.15 g: 0.15 g: 25 mL; (4) Aminated steel fiber was added to the modified cellulose dispersion, ultrasonically dispersed for 20 min, and then polyamide-650 was added to it. The mixture was stirred and mixed for 2 h, filtered, washed, and dried to obtain modified steel fiber. The ratio of the amounts of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was 1 g: 10 mL: 0.02 g;

[0070] S12: Preparation of modified polyester fiber: (1) At 85°C, waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (2) Water is heated to 85°C and then added dropwise to the mixture while stirring at a speed of 400rpm. The addition is completed within 1.5h. After the addition is completed, polyamide-650 is added and stirring is continued for 20min to obtain a waterborne epoxy emulsion, wherein the waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are mixed for 1.5h to obtain a mixture; (3) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (4) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (5) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (6) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (7) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (8) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (9) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (10) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (1 10. The mass ratio of organosilicon water-based defoamer, polyamide-650, and water is 4:0.3:0.04:2.5:14; (3) Add spiral polyvinyl alcohol fiber into a mixer and stir at a stirring speed of 150 rpm. Atomize and spray water-based epoxy emulsion into it (the working parameters of atomization spray are: atomization pressure of 0.4 MPa, droplet diameter of 40 μm, and spray amount of 15 wt% of the weight of spiral polyvinyl alcohol fiber). After drying, modified polyester fiber is obtained.

[0071] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0072] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0073] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0074] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 15 parts modified steel fiber, 8 parts modified polyester fiber, and 25 parts water.

[0075] Example 4: A processing technology for fiber-reinforced high-strength concrete:

[0076] Example 4 is based on Example 1, but the mass ratio of waterborne epoxy resin, OP-10, silicone waterborne defoamer, polyamide-650, and water is adjusted from 4:0.3:0.04:2.5:14 to 3.5:0.2:0.03:2:12. Other processes remain unchanged. Specifically:

[0077] S1: Fiber pretreatment:

[0078] S11: Preparation of modified steel fibers: (1) Add 3-aminopropyltriethoxysilane to a 75wt% aqueous ethanol solution and stir for 45 min to obtain an aminosilane hydrolysate. The ratio of the amounts of 3-aminopropyltriethoxysilane and the aqueous ethanol solution is 3 mL: 100 mL; (2) Add steel fibers (obtained by compounding fibers of the following mass fractions: 30 wt% corrugated steel fibers, 60 wt% hooked steel fibers, and 10 wt% straight steel fibers) to the aminosilane hydrolysate and stir for 2 h at 60 °C. After filtration, washing, and drying, amino-modified steel fibers are obtained. The ratio of the amounts of steel fibers and the aminosilane hydrolysate is 1 g: 10 mL; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, and 1-ethyl-3- (3-Dimethylaminopropyl)carbodiimide was added to a 75wt% ethanol aqueous solution, ultrasonically dispersed for 15 min, and then stirred and heated to 45℃ for 3 h to obtain a modified cellulose dispersion. The ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and ethanol aqueous solution was 1 g: 0.15 g: 0.15 g: 25 mL; (4) Aminated steel fiber was added to the modified cellulose dispersion, ultrasonically dispersed for 20 min, and then polyamide-650 was added to it. The mixture was stirred and mixed for 2 h, filtered, washed, and dried to obtain modified steel fiber. The ratio of the amounts of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was 1 g: 7.5 mL: 0.015 g;

[0079] S12: Preparation of modified polyester fiber: (1) At 85°C, waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (2) Water is heated to 85°C and then added dropwise to the mixture while stirring at a speed of 400rpm. The addition is completed within 1.5h. After the addition is completed, polyamide-650 is added and stirring is continued for 20min to obtain a waterborne epoxy emulsion, wherein the waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are mixed for 1.5h to obtain a mixture; (3) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (4) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (5) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (6) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (7) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (8) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (9) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (10) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (1 10. The mass ratio of organosilicon water-based defoamer, polyamide-650, and water is 3.5:0.2:0.03:2:12; (3) Add spiral polyvinyl alcohol fiber into a mixer and stir at a stirring speed of 150 rpm. Atomize and spray water-based epoxy emulsion into it (the working parameters of atomization spray are: atomization pressure of 0.4 MPa, droplet diameter of 40 μm, and spray amount of 15 wt% of the weight of spiral polyvinyl alcohol fiber). After drying, modified polyester fiber is obtained.

[0080] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0081] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0082] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0083] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 15 parts modified steel fiber, 8 parts modified polyester fiber, and 25 parts water.

[0084] Example 5: A processing technology for fiber-reinforced high-strength concrete:

[0085] Example 5 is based on Example 1, but the mass ratio of waterborne epoxy resin, OP-10, silicone waterborne defoamer, polyamide-650, and water is adjusted from 4:0.3:0.04:2.5:14 to 4.5:0.4:0.05:3:15, while other processes remain unchanged. Specifically:

[0086] S1: Fiber pretreatment:

[0087] S11: Preparation of modified steel fibers: (1) Add 3-aminopropyltriethoxysilane to a 75wt% aqueous ethanol solution and stir for 45 min to obtain an aminosilane hydrolysate. The ratio of the amounts of 3-aminopropyltriethoxysilane and the aqueous ethanol solution is 3 mL: 100 mL; (2) Add steel fibers (obtained by compounding fibers of the following mass fractions: 30 wt% corrugated steel fibers, 60 wt% hooked steel fibers, and 10 wt% straight steel fibers) to the aminosilane hydrolysate and stir for 2 h at 60 °C. After filtration, washing, and drying, amino-modified steel fibers are obtained. The ratio of the amounts of steel fibers and the aminosilane hydrolysate is 1 g: 10 mL; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, and 1-ethyl-3- (3-Dimethylaminopropyl)carbodiimide was added to a 75wt% ethanol aqueous solution, ultrasonically dispersed for 15 min, and then stirred and heated to 45℃ for 3 h to obtain a modified cellulose dispersion. The ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and ethanol aqueous solution was 1 g: 0.15 g: 0.15 g: 25 mL; (4) Aminated steel fiber was added to the modified cellulose dispersion, ultrasonically dispersed for 20 min, and then polyamide-650 was added to it. The mixture was stirred and mixed for 2 h, filtered, washed, and dried to obtain modified steel fiber. The ratio of the amounts of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was 1 g: 7.5 mL: 0.015 g;

[0088] S12: Preparation of modified polyester fiber: (1) At 85°C, waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (2) Water is heated to 85°C and then added dropwise to the mixture while stirring at a speed of 400rpm. The addition is completed within 1.5h. After the addition is completed, polyamide-650 is added and stirring is continued for 20min to obtain a waterborne epoxy emulsion, wherein the waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are mixed for 1.5h to obtain a mixture; (3) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (4) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (5) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (6) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (7) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (8) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (9) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (10) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (1 10. The mass ratio of organosilicon water-based defoamer, polyamide-650, and water is 4.5:0.4:0.05:3:15; (3) Add spiral polyvinyl alcohol fiber into a mixer and stir at a stirring speed of 150 rpm. Atomize and spray water-based epoxy emulsion into it (the working parameters of atomization spray are: atomization pressure of 0.4 MPa, droplet diameter of 40 μm, and spray amount of 15 wt% of the weight of spiral polyvinyl alcohol fiber). After drying, modified polyester fiber is obtained.

[0089] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0090] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0091] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0092] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 15 parts modified steel fiber, 8 parts modified polyester fiber, and 25 parts water.

[0093] Example 6: A processing technology for fiber-reinforced high-strength concrete:

[0094] Example 6 is based on Example 1, but with the following adjustment: the component ratio of the raw materials for fiber-reinforced high-strength concrete is adjusted, while other processes remain unchanged. Specifically:

[0095] S1: Fiber pretreatment:

[0096] S11: Preparation of modified steel fibers: (1) Add 3-aminopropyltriethoxysilane to a 75wt% aqueous ethanol solution and stir for 45 min to obtain an aminosilane hydrolysate. The ratio of the amounts of 3-aminopropyltriethoxysilane and the aqueous ethanol solution is 3 mL: 100 mL; (2) Add steel fibers (obtained by compounding fibers of the following mass fractions: 30 wt% corrugated steel fibers, 60 wt% hooked steel fibers, and 10 wt% straight steel fibers) to the aminosilane hydrolysate and stir for 2 h at 60 °C. After filtration, washing, and drying, amino-modified steel fibers are obtained. The ratio of the amounts of steel fibers and the aminosilane hydrolysate is 1 g: 10 mL; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, and 1-ethyl-3- (3-Dimethylaminopropyl)carbodiimide was added to a 75wt% ethanol aqueous solution, ultrasonically dispersed for 15 min, and then stirred and heated to 45℃ for 3 h to obtain a modified cellulose dispersion. The ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and ethanol aqueous solution was 1 g: 0.15 g: 0.15 g: 25 mL; (4) Aminated steel fiber was added to the modified cellulose dispersion, ultrasonically dispersed for 20 min, and then polyamide-650 was added to it. The mixture was stirred and mixed for 2 h, filtered, washed, and dried to obtain modified steel fiber. The ratio of the amounts of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was 1 g: 7.5 mL: 0.015 g;

[0097] S12: Preparation of modified polyester fiber: (1) At 85°C, waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (2) Water is heated to 85°C and then added dropwise to the mixture while stirring at a speed of 400rpm. The addition is completed within 1.5h. After the addition is completed, polyamide-650 is added and stirring is continued for 20min to obtain a waterborne epoxy emulsion, wherein the waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are mixed for 1.5h to obtain a mixture; (3) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (4) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (5) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (6) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (7) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (8) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (9) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (10) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (1 10. The mass ratio of organosilicon water-based defoamer, polyamide-650, and water is 4:0.3:0.04:2.5:14; (3) Add spiral polyvinyl alcohol fiber into a mixer and stir at a stirring speed of 150 rpm. Atomize and spray water-based epoxy emulsion into it (the working parameters of atomization spray are: atomization pressure of 0.4 MPa, droplet diameter of 40 μm, and spray amount of 15 wt% of the weight of spiral polyvinyl alcohol fiber). After drying, modified polyester fiber is obtained.

[0098] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0099] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0100] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0101] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 10 parts modified steel fiber, 5 parts modified polyester fiber, and 25 parts water.

[0102] Example 7: A processing technology for fiber-reinforced high-strength concrete:

[0103] Example 7 is based on Example 1, but with adjustments made to the component ratio of the raw materials for fiber-reinforced high-strength concrete, while keeping other processes unchanged. Specifically:

[0104] S1: Fiber pretreatment:

[0105] S11: Preparation of modified steel fibers: (1) Add 3-aminopropyltriethoxysilane to a 75wt% aqueous ethanol solution and stir for 45 min to obtain an aminosilane hydrolysate. The ratio of the amounts of 3-aminopropyltriethoxysilane and the aqueous ethanol solution is 3 mL: 100 mL; (2) Add steel fibers (obtained by compounding fibers of the following mass fractions: 30 wt% corrugated steel fibers, 60 wt% hooked steel fibers, and 10 wt% straight steel fibers) to the aminosilane hydrolysate and stir for 2 h at 60 °C. After filtration, washing, and drying, amino-modified steel fibers are obtained. The ratio of the amounts of steel fibers and the aminosilane hydrolysate is 1 g: 10 mL; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, and 1-ethyl-3- (3-Dimethylaminopropyl)carbodiimide was added to a 75wt% ethanol aqueous solution, ultrasonically dispersed for 15 min, and then stirred and heated to 45℃ for 3 h to obtain a modified cellulose dispersion. The ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and ethanol aqueous solution was 1 g: 0.15 g: 0.15 g: 25 mL; (4) Aminated steel fiber was added to the modified cellulose dispersion, ultrasonically dispersed for 20 min, and then polyamide-650 was added to it. The mixture was stirred and mixed for 2 h, filtered, washed, and dried to obtain modified steel fiber. The ratio of the amounts of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was 1 g: 7.5 mL: 0.015 g;

[0106] S12: Preparation of modified polyester fiber: (1) At 85°C, waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (2) Water is heated to 85°C and then added dropwise to the mixture while stirring at a speed of 400rpm. The addition is completed within 1.5h. After the addition is completed, polyamide-650 is added and stirring is continued for 20min to obtain a waterborne epoxy emulsion, wherein the waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are mixed for 1.5h to obtain a mixture; (3) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (4) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (5) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (6) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (7) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (8) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (9) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (10) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (1 10. The mass ratio of organosilicon water-based defoamer, polyamide-650, and water is 4:0.3:0.04:2.5:14; (3) Add spiral polyvinyl alcohol fiber into a mixer and stir at a stirring speed of 150 rpm. Atomize and spray water-based epoxy emulsion into it (the working parameters of atomization spray are: atomization pressure of 0.4 MPa, droplet diameter of 40 μm, and spray amount of 15 wt% of the weight of spiral polyvinyl alcohol fiber). After drying, modified polyester fiber is obtained.

[0107] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0108] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0109] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0110] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 20 parts modified steel fiber, 10 parts modified polyester fiber, and 25 parts water.

[0111] The following is a control experiment based on Example 1, with comparative examples 1 to 4, as detailed below:

[0112] Comparative Example 1: Comparative Example 1 is based on Example 1, with the following adjustment: only a single end-hook type steel fiber is used, while other processes remain unchanged. Specifically:

[0113] A processing technology for fiber-reinforced high-strength concrete:

[0114] S1: Fiber pretreatment:

[0115] S11: Preparation of modified steel fibers: (1) Add 3-aminopropyltriethoxysilane to 75wt% ethanol aqueous solution and stir for 45 min to obtain aminosilane hydrolysate. The ratio of the amount of 3-aminopropyltriethoxysilane to ethanol aqueous solution is 3mL:100mL; (2) Add end-hook steel fibers to aminosilane hydrolysate and stir for 2 h at 60℃. After filtration, washing and drying, amino-modified steel fibers are obtained. The ratio of the amount of end-hook steel fibers to aminosilane hydrolysate is 1g:10mL; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide to 75wt% ethanol. In an aqueous solution, after ultrasonic dispersion for 15 min, the mixture was stirred and heated to 45℃ for 3 h to obtain a modified cellulose dispersion. The ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and ethanol aqueous solution was 1 g: 0.15 g: 0.15 g: 25 mL. (4) Aminated steel fibers were added to the modified cellulose dispersion and ultrasonically dispersed for 20 min. Then polyamide-650 was added and stirred for 2 h. After filtration, washing, and drying, modified steel fibers were obtained. The ratio of the amounts of aminated steel fibers, modified cellulose dispersion, and polyamide-650 was 1 g: 7.5 mL: 0.015 g.

[0116] S12: Preparation of modified polyester fiber: (1) At 85°C, waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (2) Water is heated to 85°C and then added dropwise to the mixture while stirring at a speed of 400rpm. The addition is completed within 1.5h. After the addition is completed, polyamide-650 is added and stirring is continued for 20min to obtain a waterborne epoxy emulsion, wherein the waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are mixed for 1.5h to obtain a mixture; (3) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (4) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (5) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (6) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (7) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (8) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (9) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (10) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (1 10. The mass ratio of organosilicon water-based defoamer, polyamide-650, and water is 4:0.3:0.04:2.5:14; (3) Add spiral polyvinyl alcohol fiber into a mixer and stir at a stirring speed of 150 rpm. Atomize and spray water-based epoxy emulsion into it (the working parameters of atomization spray are: atomization pressure of 0.4 MPa, droplet diameter of 40 μm, and spray amount of 15 wt% of the weight of spiral polyvinyl alcohol fiber). After drying, modified polyester fiber is obtained.

[0117] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0118] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0119] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0120] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 15 parts modified steel fiber, 8 parts modified polyester fiber, and 25 parts water.

[0121] Comparative Example 2: Comparative Example 2 is based on Example 1, with the following adjustment: no modification treatment is applied to the steel fibers, while other processes remain unchanged. Specifically:

[0122] A processing technology for fiber-reinforced high-strength concrete:

[0123] S1: Fiber pretreatment:

[0124] S11: Preparation of modified polyester fiber: (1) At 85°C, waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (2) Water is heated to 85°C and then added dropwise to the mixture while stirring at a speed of 400rpm. The addition is completed within 1.5h. After the addition is completed, polyamide-650 is added and stirring is continued for 20min to obtain a waterborne epoxy emulsion, wherein the waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are mixed for 1.5h to obtain a mixture; (3) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (4) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred and mixed for 1.5h to obtain a mixture; (5) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (6) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (7) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (8) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (9) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (10) Waterborne epoxy resin, OP-10, and silicone waterborne defoamer LD-230 are stirred for 1.5h to obtain a mixture; (1 10. The mass ratio of organosilicon water-based defoamer, polyamide-650, and water is 4:0.3:0.04:2.5:14; (3) Add spiral polyvinyl alcohol fiber into a mixer and stir at a stirring speed of 150 rpm. Atomize and spray water-based epoxy emulsion into it (the working parameters of atomization spray are: atomization pressure of 0.4 MPa, droplet diameter of 40 μm, and spray amount of 15 wt% of the weight of spiral polyvinyl alcohol fiber). After drying, modified polyester fiber is obtained.

[0125] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0126] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0127] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0128] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 15 parts steel fiber, 8 parts modified polyester fiber, and 25 parts water.

[0129] Comparative Example 3: Comparative Example 3 is based on Example 1, with the following adjustment: no modification treatment is applied to the spiral polyvinyl alcohol fibers, while other processes remain unchanged. Specifically:

[0130] A processing technology for fiber-reinforced high-strength concrete:

[0131] S1: Fiber pretreatment:

[0132] S11: Preparation of modified steel fibers: (1) Add 3-aminopropyltriethoxysilane to a 75wt% aqueous ethanol solution and stir for 45 min to obtain an aminosilane hydrolysate. The ratio of the amounts of 3-aminopropyltriethoxysilane and the aqueous ethanol solution is 3 mL: 100 mL; (2) Add steel fibers (obtained by compounding fibers of the following mass fractions: 30 wt% corrugated steel fibers, 60 wt% hooked steel fibers, and 10 wt% straight steel fibers) to the aminosilane hydrolysate and stir for 2 h at 60 °C. After filtration, washing, and drying, amino-modified steel fibers are obtained. The ratio of the amounts of steel fibers and the aminosilane hydrolysate is 1 g: 10 mL; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, and 1-ethyl-3- (3-Dimethylaminopropyl)carbodiimide was added to a 75wt% ethanol aqueous solution, ultrasonically dispersed for 15 min, and then stirred and heated to 45℃ for 3 h to obtain a modified cellulose dispersion. The ratio of the amounts of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and ethanol aqueous solution was 1 g: 0.15 g: 0.15 g: 25 mL; (4) Aminated steel fiber was added to the modified cellulose dispersion, ultrasonically dispersed for 20 min, and then polyamide-650 was added to it. The mixture was stirred and mixed for 2 h, filtered, washed, and dried to obtain modified steel fiber. The ratio of the amounts of aminated steel fiber, modified cellulose dispersion, and polyamide-650 was 1 g: 7.5 mL: 0.015 g;

[0133] S2: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0134] S3: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0135] S4: Secondary mixing: Add modified steel fibers to the mixed slurry and mix for 120 seconds; then add modified polyester fibers and mix for 120 seconds; finally add the remaining water and continue mixing for 75 seconds to obtain fiber-reinforced high-strength concrete.

[0136] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 15 parts modified steel fiber, 8 parts spiral polyvinyl alcohol fiber, and 25 parts water.

[0137] Comparative Example 4: Comparative Example 4 is based on Example 1, with the following adjustments: neither the steel fiber nor the spiral polyvinyl alcohol fiber is modified, while other processes remain unchanged. Specifically:

[0138] A processing technology for fiber-reinforced high-strength concrete:

[0139] S1: Dry material premixing: Add cement, silica fume, fine sand and fly ash into the mixer and mix for 180 seconds to obtain dry mixed material;

[0140] S2: Primary mixing: Add 75% of the total water volume and all of the polycarboxylate superplasticizer to the dry-mixed material, mix for 180 seconds to obtain the mixed slurry;

[0141] S3: Secondary mixing: Add steel fibers (obtained by the following fiber blend by mass fraction: 30wt% corrugated steel fibers, 60wt% hooked steel fibers, and 10wt% straight steel fibers) to the mixed slurry and mix for 120s; then add spiral polyvinyl alcohol fibers and mix for 120s; finally add the remaining water and continue mixing for 75s to obtain fiber-reinforced high-strength concrete.

[0142] The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 120 parts cement, 20 parts silica fume, 105 parts fine sand, 20 parts fly ash, 4 parts polycarboxylate superplasticizer, 15 parts steel fiber, 8 parts spiral polyvinyl alcohol fiber, and 25 parts water.

[0143] Performance testing: The fiber-reinforced high-strength concrete from Examples 1-7 and Comparative Examples 1-4 were molded into specimens of 100mm×100mm×100mm, 100mm×100mm×400mm, and 100mm×100mm×515mm. After molding for 2 days, the specimens were demolded and cured in a standard curing room for 28 days. The compressive strength of the 100mm×100mm×100mm specimens was tested according to GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete", and the flexural strength of the 100mm×100mm×400mm specimens was tested. The shrinkage rate of the 100mm×100mm×515mm specimens was tested according to GB / T 50082-2024 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete".

[0144] The specific test results are shown in Table 1: Table 1

[0145] Conclusion: As can be seen from the data in Table 1 above, this invention comprehensively prepares a fiber-reinforced high-strength concrete with high toughness, high strength and good stability by combining different types of steel fibers, modifying steel fibers, modifying polyester fibers, and synergistically modifying steel fibers with modified polyester fibers.

[0146] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A processing method for fiber-reinforced high-strength concrete, comprising the following steps: S1: Fiber pretreatment: S11: (1) Steel fibers were modified with 3-aminopropyltriethoxysilane to obtain aminated steel fibers; (2) After carboxymethyl cellulose reacts with sodium 4-amino-1,5-naphthalenedisulfonate, aminated steel fiber and polyamide-650 are added in sequence and stirred to obtain modified steel fiber. S12: (1) Mix epoxy resin, surfactant, defoamer, polyamide-650 and water evenly to obtain an aqueous epoxy emulsion; (2) Polyester fibers were treated by atomization spraying with water-based epoxy emulsion to obtain modified polyester fibers; S2: Dry material premixing: Cement, silica fume, fine sand and fly ash are mixed evenly to obtain dry-mixed materials; S3: Primary mixing: Add 70-80% of the total water and all the water-reducing agent to the dry-mixed materials, mix evenly, and obtain the mixed slurry; S4: Secondary mixing: Modified steel fiber, modified polyester fiber, and the remaining water are added to the mixed slurry in sequence and mixed evenly to obtain fiber-reinforced high-strength concrete.

2. The processing technology of fiber-reinforced high-strength concrete according to claim 1, characterized in that: The fiber-reinforced high-strength concrete comprises the following raw material components in parts by weight: 110-125 parts cement, 15-25 parts silica fume, 95-115 parts fine sand, 15-25 parts fly ash, 3-5 parts water-reducing agent, 10-20 parts modified steel fiber, 5-10 parts modified polyester fiber, and 22-30 parts water.

3. The processing technology of fiber-reinforced high-strength concrete according to claim 1, characterized in that: The method for preparing the modified steel fiber is as follows: (1) Add 3-aminopropyltriethoxysilane to a 70-80 wt% aqueous ethanol solution and stir for 30-60 min to obtain an aminosilane hydrolysate; (2) Add steel fibers to aminosilane hydrolysate, stir and mix at 55~65℃ for 1~3h, filter, wash and dry to obtain amino-modified steel fibers; (3) Add carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide to a 70-80 wt% ethanol aqueous solution, ultrasonically disperse for 10-20 min, stir and heat to 40-50℃ for 2-4 h to obtain a modified cellulose dispersion; (4) Add the aminated steel fibers to the modified cellulose dispersion, ultrasonically disperse for 10-30 min, then add polyamide-650, stir and mix for 1-3 h, filter, wash and dry to obtain the modified steel fibers; The ratio of the amounts of 3-aminopropyltriethoxysilane and ethanol aqueous solution is (2~4) mL: 100 mL; The ratio of the amounts of steel fiber and aminosilane hydrolysate is 1g:(5~10)mL; The dosage relationship of carboxymethyl cellulose, sodium 4-amino-1,5-naphthalenedisulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and aqueous ethanol solution is 1g:(0.1~0.2)g:(0.1~0.2)g:(20~30)mL; The dosage relationship of aminated steel fiber, modified cellulose dispersion and polyamide-650 is 1g:(5~10)mL:(0.01~0.02)g.

4. The processing technology of fiber-reinforced high-strength concrete according to claim 3, characterized in that: The steel fibers are obtained by blending the following fibers by mass fraction: 20-40 wt% corrugated steel fibers, 40-60 wt% hooked steel fibers, and 5-20 wt% straight steel fibers. Its length is 9~15mm and its diameter is 0.1~0.3mm.

5. The processing technology of fiber-reinforced high-strength concrete according to claim 1, characterized in that: The method for preparing the modified polyester fiber is as follows: (1) At 80~90℃, epoxy resin, surfactant and defoamer are stirred and mixed for 1~2h to obtain a mixture; (2) Heat water to 80~90℃ and add it dropwise to the mixture while stirring at a speed of 300~500rpm. The addition is completed within 1~2h. After the addition is completed, add polyamide-650 and continue stirring for 10~30min to obtain an aqueous epoxy emulsion. (3) Add polyester fiber into a mixer, and while stirring, spray waterborne epoxy emulsion into it by atomization. After drying, modified polyester fiber is obtained. The mass ratio of epoxy resin, surfactant, defoamer, polyamide-650, and water is (3.5~4.5):(0.2~0.4):(0.03~0.05):(2~3):(12~15).

6. The processing technology of fiber-reinforced high-strength concrete according to claim 5, characterized in that: The polyester fiber is a spiral polyester fiber, specifically a spiral polyvinyl alcohol fiber; its length is 9~15mm and its diameter is 0.1~0.3mm.

7. The processing technology of fiber-reinforced high-strength concrete according to claim 5, characterized in that: The epoxy resin is a water-based epoxy resin; the surfactant is an alkylphenol polyoxyethylene ether type surfactant; and the defoamer is an organosilicon water-based defoamer.

8. The processing technology of fiber-reinforced high-strength concrete according to claim 5, characterized in that: The operating parameters of the atomizing spray are: atomizing pressure of 0.2~0.5MPa, droplet diameter of 20~50μm, and spray volume of 10~20wt% of the polyester fiber weight.

9. The processing technology of fiber-reinforced high-strength concrete according to claim 1, characterized in that: The cement is PO 52.5 grade cement; the silica fume has a bulk density ≥300kg / m3 and a silica content ≥92%; the fine sand has a particle size of 0.1~0.5mm; the fly ash is Grade I fly ash; the water-reducing agent is a polycarboxylate water-reducing agent with a water reduction rate ≥25%.

10. Fiber-toughened high-strength concrete processed according to any one of claims 1 to 9.

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