Basalt fiber concrete and its application in truck scale

Abstract

The application discloses basalt fiber concrete and application thereof in truck scale, and relates to the technical field of reinforced concrete truck scale.The application discloses basalt fiber concrete, which comprises the following components in percentage by weight: 18-22% of gel material, 25-30% of fine aggregate, 44-46% of coarse aggregate, 0.2-0.4% of water reducing agent, 0.4-0.6% of modified fiber and 5-8% of water, and the sum of the percentage by weight of the components is 100%; the application is modified into modified fiber by organic modification of basalt fiber; the modified fiber prepared by the application is added into the concrete components, the modified fiber has good interface bonding performance with the concrete base material, the prepared basalt fiber concrete has the characteristics of high mechanical strength and good toughness; and the application of the basalt fiber concrete in the reinforced concrete truck scale effectively prolongs the service life of the truck scale.

Description

Technical Field

[0001] This invention relates to the field of reinforced concrete truck scale technology, specifically to a basalt fiber reinforced concrete and its application in truck scales. Background Technology

[0002] Truck scales, commonly known as truck weighbridges, are large-scale weighing devices used to weigh motor vehicles on the ground. Truck scales have gone through two development stages: mechanical truck scales and electronic truck scales. Currently, mechanical truck scales have been replaced by electronic truck scales, which are easier to maintain and more accurate in measurement. Electronic truck scales are still developing, with their sensors evolving from analog signal sensors to digital sensors, and their weighing platforms evolving from all-steel structures to steel-framed concrete structures, reinforced concrete structures, and stainless steel concrete structures. Compared with all-steel structures, concrete structure electronic truck scale platforms have the following advantages: (1) High strength of reinforced concrete; (2) Cement concrete is a non-metallic material with excellent corrosion and oxidation resistance, eliminating the need for painting, saving on painting processes and reducing production costs, as well as eliminating the need for regular rust prevention maintenance; (3) Concrete platforms are non-conductive, effectively preventing lightning strikes and avoiding sensor damage; (4) On-site concrete pouring reduces equipment transportation costs. Although all-steel structure load-bearing electronic truck scales are currently widely used, all-steel structure electronic truck scale platforms are gradually being replaced by concrete structure electronic truck scale platforms.

[0003] Reactive powder concrete is a high-strength, durable, and stable high-performance concrete developed in the 1990s. It improves matrix density by optimizing particle size distribution and enhances mechanical strength by adding silicon-containing materials such as fly ash as active ingredients. However, this increases the brittleness of the concrete. To address this, fibers are typically added to enhance toughness. Basalt fiber, an environmentally friendly material made from natural basalt ore, possesses excellent mechanical properties, corrosion resistance, high-temperature resistance, and electrical insulation properties, and is widely used in concrete reinforcement. However, due to its high toughness, basalt fiber cannot be bent into hooks to enhance mechanical anchoring. Furthermore, the chemical inertness of its surface weakens the bond between the fiber and the cement matrix. Therefore, while adding basalt fiber can effectively increase the ultimate tensile strength of concrete, it reduces the splitting tensile strength, affecting its application in truck scales. While existing technologies include methods to improve the bonding strength between nano-silica, fibers, and resins by grafting nano-silica onto the surface of early basalt fibers and using silane coupling agents, nanoparticles have high specific surface area and surface activity. Due to their inherent characteristics, nanoparticles tend to aggregate, which directly affects the modification effect. Summary of the Invention

[0004] The purpose of this invention is to provide basalt fiber reinforced concrete and its application in truck scales, and to solve the following technical problems:

[0005] Due to its high surface chemical inertness and strong toughness, the existing basalt fiber has poor interfacial performance with the concrete matrix. With the addition of basalt fiber, the splitting tensile strength of concrete decreases, affecting its application in truck scales.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A basalt fiber reinforced concrete comprises the following components by weight percentage: 18-22% gel material, 25-30% fine aggregate, 44-46% coarse aggregate, 0.2-0.4% water-reducing agent, 0.4-0.6% modified fiber, and 5-8% water, wherein the sum of the weight percentages of each component is 100%.

[0008] The preparation method of modified fibers includes the following steps:

[0009] A1: In a nitrogen atmosphere, tetraethyl orthosilicate, p-toluenesulfonic acid, and anhydrous ethanol were added to reactor A and dispersed evenly. 3-glycidyl etheroxypropyltrimethoxysilane was added and aged for 1-3 hours under stirring at room temperature. Basalt fiber was added to the reactor and reacted for 1-2 hours under stirring at room temperature. The solvent was removed under reduced pressure to obtain an organosilicon-modified basalt fiber composition.

[0010] A2: 10-(2-methacryloyloxy)phosphate monodecyl ester, 3-mercaptopropyltriethoxysilane, and benzoin dimethyl ether were added to a glass reaction flask and dispersed evenly. The mixture was then treated under ultraviolet irradiation for 12-24 hours to obtain the modifier.

[0011] A3: The organosilicon-modified basalt fiber composition and 3-aminopropyltriethoxysilane are added to the reactor and dispersed evenly. The temperature is controlled at 30-40℃ and the reaction is maintained for 6-12 hours. The pH is adjusted to 6-7 and the temperature is maintained for another 0.5-1 hour. Deionized water, dibutyltin dilaurate, and modifier are added and dispersed evenly. The reaction is maintained for 6-9 hours. The mixture is then filtered, washed, and dried to obtain the modified fiber.

[0012] Preferably, the addition ratio of tetraethyl orthosilicate, p-toluenesulfonic acid, anhydrous ethanol, 3-glycidyl etheroxypropyltrimethoxysilane, and basalt fiber in A1 is 5-8 mL: 0.04-0.06 g: 20-50 mL: 1-1.2 g: 10 g.

[0013] Preferably, the addition ratio of 10-(2-methacryloyloxy)phosphate monodecyl ester, 3-mercaptopropyltriethoxysilane, and benzoin dimethyl ether in A2 is 0.9-1g:1g:0.1-0.2g.

[0014] Preferably, the addition ratio of the organosilicon-modified basalt fiber composition, 3-aminopropyltriethoxysilane, deionized water, dibutyltin dilaurate, and modifier in A3 is 10g: 4-6g: 0.6-1.2g: 10-20uL: 3-6g.

[0015] Preferably, the basalt fiber is a short basalt fiber with a length of 6-18 mm, a diameter of 10-15 μm, an elastic modulus of 95-120 GPa, a compressive strength of 3200-4500 MPa, and an elongation at break of 2.5-25%.

[0016] Preferably, the gel material is obtained by mixing cement, fly ash and mineral powder in a mass ratio of 10:1.2-1.6:0.9-1.6.

[0017] Preferably, the mixture is made of fine crushed stone and coarse crushed stone with a mass ratio of 1:2-3; the particle size of the fine crushed stone is 5-10 mm; and the particle size of the coarse crushed stone is 10-20 mm.

[0018] Preferably, the fine aggregate is grade II river sand with a fineness modulus of 2-3.

[0019] Preferably, the water-reducing agent is a polycarboxylate water-reducing agent.

[0020] Any of the above-mentioned basalt fiber reinforced concretes can be used in truck scales.

[0021] The beneficial effects of this invention are:

[0022] (1) This application uses silane coupling agent and tetraethyl orthosilicate as precursors and solid acid-p-toluenesulfonic acid as catalyst to modify the surface of basalt fiber to obtain organosilicon modified basalt fiber composition, which effectively improves the surface roughness and surface activity of basalt fiber, and enables basalt fiber to achieve stronger bonding with cement gel material; this application further utilizes the mercapto group of 3-mercaptopropyltriethoxysilane and the vinyl group of 10-(2-methacryloyloxy)monodecanyl phosphate to conduct click chemical synthesis to obtain silane coupling agent containing phosphate ester, i.e., modifier; this application further utilizes 3-aminopropyltriethoxysilane to modify organosilicon modified basalt fiber composition to obtain basalt fiber with a large number of alkoxy groups on the surface; finally, the modifier is crosslinked with the aforementioned basalt fiber with a large number of alkoxy groups on the surface to obtain modified fiber.

[0023] Basalt fiber-reinforced concrete, prepared by adding the modified fibers to a concrete matrix, is a high-durability, high-mechanical-strength, and high-toughness concrete material. It exhibits strong crack resistance, good impermeability, high stiffness, high strength, and good shear and fatigue resistance. When used in truck scales, it effectively reduces structural cross-sectional dimensions, lowers structural self-weight, prevents truck scale cracking, reduces deflection, significantly delays crack initiation, and increases component durability. It also enhances the material's shear resistance; the vertical component of the combined force of concrete and reinforcing steel partially offsets the shear force, thus increasing shear capacity and strengthening the component's load-bearing capacity. Using the basalt fiber-reinforced concrete material prepared in this application to manufacture reinforced concrete truck scales not only provides high flexural and compressive strength but also effectively reduces the corrosion of the reinforcing steel, significantly extending the service life of the truck scale.

[0024] (2) The modified fiber prepared in this application is a basalt fiber with grafted organosilicon molecular chains, phosphate groups and siloxane groups. The chemical reaction between the siloxane groups and the basalt fiber facilitates the coating of the steel reinforcement by the organic molecular chains on the surface of the basalt fiber, forming a coupling agent layer on the surface of the steel reinforcement, which improves the interfacial bonding between the concrete and the steel reinforcement matrix. The phosphate groups on the surface of the modified fiber can form a dense phosphate protective film with the steel reinforcement metal, which passivates the metal surface and prevents water molecules and other salt ions from contacting the metal, thereby achieving the function of preventing steel reinforcement corrosion.

[0025] (3) This application uses a composite of cement, fly ash and mineral powder as a gel material to prepare a multi-element gel material system. The composite of cement, fly ash and mineral powder with different fineness significantly improves the particle size distribution of the material, increases the density of concrete, and improves the mechanical strength of concrete. Moreover, the hydration reaction of fly ash and mineral powder under alkaline conditions produces a super-addition phenomenon, which improves the elastic modulus of concrete through synergistic effect. Detailed Implementation

[0026] 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.

[0027] Example 1: The preparation method of the modified fiber includes the following steps:

[0028] A1: In a nitrogen atmosphere, 5 mL of tetraethyl orthosilicate, 0.04 g of p-toluenesulfonic acid, and 20 mL of anhydrous ethanol were added to reactor A and dispersed evenly. 1 g of 3-glycidyl etheroxypropyltrimethoxysilane was added, and the mixture was aged for 1 h under stirring at room temperature. 10 g of basalt fiber (diameter 13 μm, length 12 mm, elastic modulus 99.21 GPa, compressive strength 3788.1 MPa, elongation at break 4.0%) was added to the reactor, and the mixture was reacted for 1 h under stirring at room temperature. The solvent was removed under reduced pressure to obtain an organosilicon-modified basalt fiber composition.

[0029] A2: 9g of 10-(2-methacryloyloxy)phosphate monodecyl ester, 10g of 3-mercaptopropyltriethoxysilane, and 1g of benzoin dimethyl ether were added to a glass reaction flask and dispersed evenly. The mixture was then treated under ultraviolet irradiation for 12h (20W ultraviolet lamp, 365nm wavelength light) to obtain the modifier.

[0030] A3: 10g of organosilicon-modified basalt fiber composition and 4g of 3-aminopropyltriethoxysilane were added to a reaction vessel and dispersed evenly. The temperature was controlled at 30℃ and the reaction was maintained for 6h. Glacial acetic acid was added to adjust the pH to 6, and the temperature was maintained for another 0.5h. 0.6g of deionized water, 10uL of dibutyltin dilaurate, and 3g of modifier were added and dispersed evenly. The reaction was maintained for another 6h. The mixture was then filtered, washed, and dried to obtain the modified fiber.

[0031] Example 2: The preparation method of the modified fiber includes the following steps:

[0032] A1: In a nitrogen atmosphere, 6.5 mL of tetraethyl orthosilicate, 0.05 g of p-toluenesulfonic acid, and 35 mL of anhydrous ethanol were added to reactor A and dispersed evenly. 1.1 g of 3-glycidyl etheroxypropyltrimethoxysilane was added, and the mixture was aged for 1-3 h under stirring at room temperature. 10 g of basalt fiber (diameter 13 μm, length 12 mm, elastic modulus 99.21 GPa, compressive strength 3788.1 MPa, elongation at break 4.0%) was added to the reactor, and the mixture was reacted for 1.5 h under stirring at room temperature. The solvent was removed under reduced pressure to obtain the organosilicon-modified basalt fiber composition.

[0033] A2: 9.5g of 10-(2-methacryloyloxy)phosphate monodecyl ester, 10g of 3-mercaptopropyltriethoxysilane, and 1.5g of benzoin dimethyl ether were added to a glass reaction flask and dispersed evenly. The mixture was then treated under ultraviolet irradiation for 18h (20W ultraviolet lamp, 365nm wavelength light) to obtain the modifier.

[0034] A3: 10g of organosilicon-modified basalt fiber composition and 5g of 3-aminopropyltriethoxysilane were added to a reaction vessel and dispersed evenly. The temperature was controlled at 35℃ and the reaction was maintained for 9h. Glacial acetic acid was added to adjust the pH to 6, and the temperature was maintained for another 0.5h. 1g of deionized water, 15uL of dibutyltin dilaurate, and 4.5g of modifier were added and dispersed evenly. The reaction was maintained for 6h. The mixture was then filtered, washed, and dried to obtain the modified fiber.

[0035] Example 3: The preparation method of the modified fiber includes the following steps:

[0036] A1: In a nitrogen atmosphere, 8 mL of tetraethyl orthosilicate, 0.06 g of p-toluenesulfonic acid, and 50 mL of anhydrous ethanol were added to reactor A and dispersed evenly. 1.2 g of 3-glycidyl etheroxypropyltrimethoxysilane was added, and the mixture was aged for 3 h under stirring at room temperature. 10 g of basalt fiber (diameter 13 μm, length 12 mm, elastic modulus 99.21 GPa, compressive strength 3788.1 MPa, elongation at break 4.0%) was added to the reactor, and the mixture was reacted for 1-2 h under stirring at room temperature. The solvent was removed under reduced pressure to obtain an organosilicon-modified basalt fiber composition.

[0037] A2: 10g of 10-(2-methacryloyloxy)phosphate monodecyl ester, 10g of 3-mercaptopropyltriethoxysilane, and 2g of benzoin dimethyl ether were added to a glass reaction flask and dispersed evenly. The mixture was then treated under ultraviolet irradiation for 24h (20W ultraviolet lamp, 365nm wavelength light) to obtain the modifier.

[0038] A3: 10g of organosilicon-modified basalt fiber composition and 6g of 3-aminopropyltriethoxysilane were added to a reaction vessel and dispersed evenly. The temperature was controlled at 40℃ and the reaction was maintained for 12h. Glacial acetic acid was added to adjust the pH to 7, and the temperature was maintained for another 1h. 1.2g of deionized water, 20uL of dibutyltin dilaurate, and 6g of modifier were added and dispersed evenly. The reaction was maintained for 9h. The mixture was then filtered, washed, and dried to obtain the modified fiber.

[0039] Example 4: The preparation method of basalt fiber reinforced concrete includes the following steps:

[0040] 158g of P.O 42.5 silicate cement, 19g of fly ash (Class I fly ash, F grade), 17g of mineral powder (S95 grade slag), 270g of fine aggregate (Class II graded river sand, fineness modulus 2.5), 135g of fine crushed stone (particle size 5-10mm), 307g of coarse crushed stone (particle size 10-20mm), and 2g of polycarboxylate superplasticizer (BASF melflix-1641f high-efficiency polycarboxylate solid superplasticizer produced by BASF-Degussa GmbH, Germany) were blended together, 40mL of water was added for blending, 5g of the modified fiber prepared in Example 1 was added for blending, and 47mL of water was added for blending to obtain basalt fiber concrete.

[0041] Example 5: The preparation method of basalt fiber reinforced concrete includes the following steps:

[0042] 158g of P.O 42.5 silicate cement, 19g of fly ash (Class I fly ash, F grade), 17g of mineral powder (S95 grade slag), 270g of fine aggregate (Class II graded river sand, fineness modulus 2.5), 135g of fine crushed stone (particle size 5-10mm), 307g of coarse crushed stone (particle size 10-20mm), and 2g of polycarboxylate superplasticizer (BASF melflix-1641f high-efficiency polycarboxylate solid superplasticizer produced by BASF-Degussa GmbH, Germany) were blended together, 40mL of water was added for blending, 5g of the modified fiber prepared in Example 2 was added for blending, and 47mL of water was added for blending to obtain basalt fiber concrete.

[0043] Example 6: The preparation method of basalt fiber reinforced concrete includes the following steps:

[0044] 158g of P.O 42.5 silicate cement, 19g of fly ash (Class I fly ash, F grade), 17g of mineral powder (S95 grade slag), 270g of fine aggregate (Class II graded river sand, fineness modulus 2.5), 135g of fine crushed stone (particle size 5-10mm), 307g of coarse crushed stone (particle size 10-20mm), and 2g of polycarboxylate superplasticizer (BASF melflix-1641f high-efficiency polycarboxylate solid superplasticizer produced by BASF-Degussa GmbH, Germany) were blended together, 40mL of water was added for blending, 5g of the modified fiber prepared in Example 3 was added for blending, and 47mL of water was added for blending to obtain basalt fiber concrete.

[0045] The preparation method of the modified fiber in Comparative Example 1 includes the following steps:

[0046] In a nitrogen atmosphere, 6.5 mL of tetraethyl orthosilicate, 0.05 g of p-toluenesulfonic acid, and 35 mL of anhydrous ethanol were added to reactor A and dispersed evenly. 1.1 g of 3-glycidyl etheroxypropyltrimethoxysilane was added, and the mixture was aged for 1-3 h under stirring at room temperature. 10 g of basalt fiber (diameter 13 μm, length 12 mm, elastic modulus 99.21 GPa, compressive strength 3788.1 MPa, elongation at break 4.0%) was added to the reactor, and the mixture was reacted for 1.5 h under stirring at room temperature. The solvent was removed under reduced pressure to obtain an organosilicon-modified basalt fiber composition.

[0047] The preparation method of the modified fiber in Comparative Example 2 includes the following steps:

[0048] A1: 9.5g of 10-(2-methacryloyloxy)phosphate monodecyl ester, 10g of 3-mercaptopropyltriethoxysilane, and 1.5g of benzoin dimethyl ether were added to a glass reaction flask and dispersed evenly. The mixture was then treated under ultraviolet irradiation for 18h (20W ultraviolet lamp, 365nm wavelength light) to obtain the modifier.

[0049] A2: 10g of basalt fiber (diameter 13um, length 12mm, elastic modulus 99.21GPa, compressive strength 3788.1MPa, elongation at break 4.0%) and 5g of 3-aminopropyltriethoxysilane were added to a reaction vessel and dispersed evenly. The temperature was controlled at 35℃ and the reaction was maintained for 9h. Glacial acetic acid was added to adjust the pH to 6, and the temperature was maintained for another 0.5h. 1g of deionized water, 15uL of dibutyltin dilaurate, and 4.5g of modifier were added and dispersed evenly. The reaction was maintained for 6h. The mixture was then filtered, washed, and dried to obtain the modified fiber.

[0050] The preparation method of the modified fiber in Comparative Example 3 includes the following steps:

[0051] A1: In a nitrogen atmosphere, 6.5 mL of tetraethyl orthosilicate, 0.05 g of p-toluenesulfonic acid, and 35 mL of anhydrous ethanol were added to reactor A and dispersed evenly. 1.1 g of 3-glycidyl etheroxypropyltrimethoxysilane was added, and the mixture was aged for 1-3 h under stirring at room temperature. 10 g of basalt fiber (diameter 13 μm, length 12 mm, elastic modulus 99.21 GPa, compressive strength 3788.1 MPa, elongation at break 4.0%) was added to the reactor, and the mixture was reacted for 1.5 h under stirring at room temperature. The solvent was removed under reduced pressure to obtain the organosilicon-modified basalt fiber composition.

[0052] A2: 10g of organosilicon-modified basalt fiber composition and 5g of 3-aminopropyltriethoxysilane were added to a reaction vessel and dispersed evenly. The temperature was controlled at 35℃ and the reaction was maintained for 9h. Glacial acetic acid was added to adjust the pH to 6, and the temperature was maintained for another 0.5h. 1g of deionized water and 15uL of dibutyltin dilaurate were added and the reaction was maintained for 6h. The mixture was filtered, washed, and dried. Then it was mixed evenly with 2.2g of 10-(2-methacryloyloxy)monodecanyl phosphate to obtain modified fiber.

[0053] The preparation method of basalt fiber reinforced concrete in Comparative Example 4 includes the following steps:

[0054] 158g of P.O 42.5 silicate cement, 19g of fly ash (Class I fly ash, F grade), 17g of mineral powder (S95 grade slag), 270g of fine aggregate (Class II graded river sand, fineness modulus 2.5), 135g of fine crushed stone (particle size 5-10mm), 307g of coarse crushed stone (particle size 10-20mm), and 2g of polycarboxylate superplasticizer (BASF melflix-1641f high-efficiency polycarboxylate solid superplasticizer produced by BASF-Degussa GmbH, Germany) were blended together, 40mL of water was added for blending, 5g of the modified fiber prepared in Comparative Example 1 was added for blending, and 47mL of water was added for blending to obtain basalt fiber concrete.

[0055] The preparation method of basalt fiber reinforced concrete in Comparative Example 5 includes the following steps:

[0056] 158g of P.O 42.5 silicate cement, 19g of fly ash (Class I fly ash, F grade), 17g of mineral powder (S95 grade slag), 270g of fine aggregate (Class II graded river sand, fineness modulus 2.5), 135g of fine crushed stone (particle size 5-10mm), 307g of coarse crushed stone (particle size 10-20mm), and 2g of polycarboxylate superplasticizer (BASF melflix-1641f high-efficiency polycarboxylate solid superplasticizer produced by BASF-Degussa GmbH, Germany) were blended together, 40mL of water was added for blending, 5g of the modified fiber prepared in Comparative Example 2 was added for blending, and 47mL of water was added for blending to obtain basalt fiber concrete.

[0057] The preparation method of basalt fiber reinforced concrete in Comparative Example 6 includes the following steps:

[0058] 158g of P.O 42.5 silicate cement, 19g of fly ash (Class I fly ash, F grade), 17g of mineral powder (S95 grade slag), 270g of fine aggregate (Class II graded river sand, fineness modulus 2.5), 135g of fine crushed stone (particle size 5-10mm), 307g of coarse crushed stone (particle size 10-20mm), and 2g of polycarboxylate superplasticizer (BASF melflix-1641f high-efficiency polycarboxylate solid superplasticizer produced by BASF-Degussa GmbH, Germany) were blended together, 40mL of water was added for blending, 5g of the modified fiber prepared in Comparative Example 3 was added for blending, and 47mL of water was added for blending to obtain basalt fiber concrete.

[0059] Performance testing

[0060] The basalt fiber concrete prepared in Examples 4-6 and Comparative Examples 4-6 were cured at 20°C and RH 95% for 7 days and 28 days, respectively, and the following tests were conducted.

[0061] (1) Mechanical properties: The mechanical properties of ordinary concrete were tested according to GB / T 50081-2002 "Test Methods for Mechanical Properties of Ordinary Concrete". The compressive strength and splitting tensile strength were tested using a TSY-2000 compression testing machine.

[0062] ① Compressive strength: Specimen size 150×150×150mm 3 The compressive strength Fcu is calculated according to the following formula:

[0063] Fcu = F / A

[0064] In the formula, Fcu is the compressive strength (MPa); F is the failure load of the specimen (N); and A is the bearing area of ​​the specimen (mm²). 2 The calculation results are shown in Table 1.

[0065] ② Splitting tensile strength: Specimen size 150×150×150mm 3 The specimen was placed on a steel positioning bracket, with steel pads used, and the splitting tensile strength was tested under a compression testing machine. The loading speed was set to 0.06 kN / s, and the loading speed was uniform and continuous during the test. The splitting tensile strength Fts was calculated according to the following formula:

[0066] Fts=2F / (Aπ)

[0067] In the formula, Fts is the splitting tensile strength (MPa); F is the failure load of the specimen (N); and A is the bearing area of ​​the specimen (mm²). 2 The calculation results are shown in Table 1.

[0068] ③ Flexural strength: Specimen size 550×150×150 mm 3 The load was set at a speed of 0.06 kN / s. The loading speed was uniform and continuous during the test, and the flexural strength Fb was calculated according to the following formula:

[0069] Fb=Fl / (bh 2 )

[0070] In the formula, Fb is the flexural strength (MPa); F is the failure load of the specimen (N); l is the spacing between the lower supports of the specimen during the loading test (mm); b is the width of the specimen section (mm); h is the height of the specimen section (mm); the calculation results are shown in Table 1.

[0071] Table 1: Statistical Table of Mechanical Property Test Data for Examples 4-6 and Comparative Examples 4-6

[0072]

[0073]

[0074] As shown in Table 1, the modified fibers prepared in this application, when added to concrete, effectively enhance the concrete's ability to resist cracks of various levels, thereby strengthening and toughening the concrete.

[0075] (2) Slump: The test was conducted according to GB / T 50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures". The test results are shown in Table 2.

[0076] (3) Electrical flux: The test was conducted according to GB / T 50081-2009 "Test methods for long-term performance and durability of ordinary concrete". The strength dimension conversion factor was 0.8 for fiber concrete. The test results are shown in Table 2.

[0077] (4) Corrosion resistance: According to the "Test Methods for Concrete in Port Engineering", the steel bars were placed in the basalt fiber concrete prepared in Examples 4-6 and Comparative Examples 4-6 for curing and molding. The curing environment was 20℃ and RH95% for 8 days. After soaking in water for 24 hours, the steel bars were taken out and dried (30℃ and dried for 2 days). The above soaking and drying steps were repeated five times. The specimens were split open, and the weight loss rate and rust accumulation rate of the steel bars were measured after treatment. The test results are shown in Table 2.

[0078] Table 2: Performance Test Data Statistics of Examples 4-6 and Comparative Examples 4-6

[0079]

[0080]

[0081] As shown in Table 2, the modified fibers prepared in this application, when added to concrete, effectively improve the density of concrete and thus enhance its durability. This application organically modifies basalt fibers, and the organic molecular chains on the surface of the modified fibers coat the surface of the reinforcing bars, giving the reinforcing bars in the concrete corrosion resistance and greatly improving the service life of truck scales made using basalt fiber concrete.

[0082] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A basalt fiber reinforced concrete, characterized in that, It comprises the following components by weight percentage: 18-22% gel material, 25-30% fine aggregate, 44-46% coarse aggregate, 0.2-0.4% water-reducing agent, 0.4-0.6% modified fiber, and 5-8% water, with the sum of the weight percentages of each component being 100%. The method for preparing the modified fiber includes the following steps: A1: In a nitrogen atmosphere, tetraethyl orthosilicate, p-toluenesulfonic acid, and anhydrous ethanol were added to reactor A and dispersed evenly. 3-glycidyl etheroxypropyltrimethoxysilane was added and aged for 1-3 hours under stirring at room temperature. Basalt fiber was added to the reactor and reacted for 1-2 hours under stirring at room temperature. The solvent was removed under reduced pressure to obtain an organosilicon-modified basalt fiber composition. A2: 10-(2-methacryloyloxy)phosphate monodecyl ester, 3-mercaptopropyltriethoxysilane, and benzoin dimethyl ether were added to a glass reaction flask and dispersed evenly. The mixture was then treated under ultraviolet irradiation for 12-24 hours to obtain the modifier. A3: The organosilicon-modified basalt fiber composition and 3-aminopropyltriethoxysilane are added to the reactor and dispersed evenly. The temperature is controlled at 30-40℃ and the reaction is maintained for 6-12 hours. The pH is adjusted to 6-7 and the temperature is maintained for another 0.5-1 hour. Deionized water, dibutyltin dilaurate, and modifier are added and dispersed evenly. The reaction is maintained for 6-9 hours. The mixture is then filtered, washed, and dried to obtain the modified fiber.

2. The basalt fiber reinforced concrete according to claim 1, characterized in that, The addition ratio of tetraethyl orthosilicate, p-toluenesulfonic acid, anhydrous ethanol, 3-glycidyl etheroxypropyltrimethoxysilane, and basalt fiber in A1 is 5-8 mL: 0.04-0.06 g: 20-50 mL: 1-1.2 g: 10 g.

3. The basalt fiber reinforced concrete according to claim 1, characterized in that, The addition ratio of 10-(2-methacryloyloxy)phosphate monodecyl ester, 3-mercaptopropyltriethoxysilane, and benzoin dimethyl ether in A2 is 0.9-1g:1g:0.1-0.2g.

4. The basalt fiber reinforced concrete according to claim 1, characterized in that, The addition ratio of the organosilicon-modified basalt fiber composition, 3-aminopropyltriethoxysilane, deionized water, dibutyltin dilaurate, and modifier in A3 is 10g: 4-6g: 0.6-1.2g: 10-20µL: 3-6g.

5. The basalt fiber reinforced concrete according to claim 1, characterized in that, Basalt fiber consists of short basalt fibers with a length of 6-18 mm, a diameter of 10-15 µm, an elastic modulus of 95-120 GPa, a compressive strength of 3200-4500 MPa, and an elongation at break of 2.5-25%.

6. The basalt fiber reinforced concrete according to claim 1, characterized in that, The gel material is obtained by mixing cement, fly ash and mineral powder in a mass ratio of 10:1.2-1.6:0.9-1.

6.

7. The basalt fiber reinforced concrete according to claim 1, characterized in that, The coarse aggregate is obtained by mixing fine crushed stone and coarse crushed stone in a mass ratio of 1:2-3; the particle size of the fine crushed stone is 5-10 mm; and the particle size of the coarse crushed stone is 10-20 mm.

8. The basalt fiber reinforced concrete according to claim 1, characterized in that, The fine aggregate is grade II river sand with a fineness modulus of 2-3.

9. The basalt fiber reinforced concrete according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate water-reducing agent.

10. The application of basalt fiber reinforced concrete according to any one of claims 1-9 in truck scales.

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