High-strength concrete for PC component and preparation method of high-strength concrete

Abstract

The invention relates to the technical field of concrete, and provides high-strength concrete for PC components and a preparation method thereof.The high-strength concrete is prepared from 90-100 parts of cement, 15-20 parts of blast furnace slag, 32-42 parts of carbide slag, 12-18 parts of zeolite powder, 15-25 parts of modified fibers, 1-5 parts of early strength agent, 0.01-0.015 part of air entraining agent, 1-2 parts of water reducing agent and 45-55 parts of water; the modified fibers comprise nickel-plated carbon fibers and aramid fibers in a mass ratio of (1: 19)-(19: 1). By means of the technical scheme, the problems that in the prior art, concrete is low in strength and poor in abrasion resistance are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete, and in particular to a high-strength concrete for PC components and a preparation method thereof. Background Art

[0002] With the rapid development of building industrialization, precast concrete (PC) components are increasingly used in construction projects. In order to meet the higher requirements of modern buildings for structural performance and safety, the research and development and application of high-strength concrete for PC components has become a hot topic.

[0003] However, in the actual production and use process, due to improper selection of raw materials and unreasonable design of raw material ratios, the concrete used in PC components still has problems such as low strength and poor wear resistance, which affects the safety and durability of the building structure.

[0004] Therefore, it is necessary to obtain a high-strength and wear-resistant concrete for PC components to meet the higher requirements of modern buildings for structural performance and safety and promote the industry development of concrete for PC components. Summary of the invention

[0005] The present invention provides a high-strength concrete for PC components and a preparation method thereof, which solves the problems of low strength and poor wear resistance of concrete in the related art.

[0006] The technical solution of the present invention is as follows: The present invention provides a high-strength concrete for PC components, comprising the following components in parts by weight: 90-100 parts of cement, 15-20 parts of blast furnace slag, 32-42 parts of carbide slag, 12-18 parts of zeolite powder, 15-25 parts of modified fiber, 1-5 parts of early strength agent, 0.01-0.015 parts of air entraining agent, 1-2 parts of water reducer, and 45-55 parts of water; The modified fiber comprises nickel-plated carbon fiber and aramid fiber in a mass ratio of 1:19 to 19:1.

[0007] As a further technical solution, the mass ratio of the nickel-plated carbon fiber to the aramid fiber is 1:9~4:1.

[0008] In the present invention, by adjusting the components of the modified fiber, when the mass ratio of the nickel-plated carbon fiber to the aramid fiber is 1:9-4:1, the strength and wear resistance of the concrete are further improved.

[0009] As a further technical solution, the modified fiber also includes 4-decyloxybenzoic acid.

[0010] As a further technical solution, the preparation method of the modified fiber includes the following steps: adding the nickel-plated carbon fiber, aramid fiber, and 4-decyloxybenzoic acid into a coupling agent solution, mixing, and drying to obtain the modified fiber.

[0011] As a further technical solution, the components of the coupling agent solution include a coupling agent and a solvent in a mass volume ratio of 1 g:15~25 mL; the mass ratio of the coupling agent to the 4-decyloxybenzoic acid is 1:1~2.

[0012] In the present invention, the modified fiber component includes 4-decyloxybenzoic acid, and 4-decyloxybenzoic acid is used to modify the nickel-plated carbon fiber and the aramid fiber to reduce the agglomeration tendency between the fibers, thereby further improving the strength and wear resistance of the concrete.

[0013] As a further technical solution, the mass of the 4-decyloxybenzoic acid is 0.1 to 0.5 times the total mass of the nickel-plated carbon fiber and the aramid fiber.

[0014] As a further technical solution, the particle size of the blast furnace slag is 30-50 μm; the particle size of the carbide slag is 80-100 μm; the particle size of the zeolite powder is 100-200 mesh; the diameter of the modified fiber is 7-20 μm, and the length is 3-9 mm.

[0015] As a further technical solution, the early strength agent includes one or both of carbonates and chlorides; the air entraining agent includes one or both of alkylbenzene sulfonates and fatty alcohol sulfonates; and the water reducing agent includes one or both of lignin sulfonates and polycarboxylates.

[0016] The present invention also proposes a method for preparing high-strength concrete for PC components, comprising the following steps: The components of the concrete are mixed to obtain concrete.

[0017] The present invention also proposes the use of the high-strength concrete for PC components or the concrete prepared by the preparation method in PC components.

[0018] The working principle and beneficial effects of the present invention are: In the present invention, concrete is formulated with cement, blast furnace slag, carbide slag, zeolite powder, modified fiber and other components for synergy enhancement. In particular, the modified fiber components are synergistically formulated with nickel-plated carbon fiber and aramid fiber in a mass ratio of 1:19 to 19:1, which significantly improves the strength and wear resistance of the concrete. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the following examples and comparative examples, the cement is ordinary Portland cement PO 32.5; the Ni content of the nickel-plated carbon fiber is 47.8 wt %, and it is purchased from Cangzhou Zhongli New Material Technology Co., Ltd.

[0021] Example 1 The high-strength concrete for PC components comprises the following components in parts by weight: 90 parts of cement, 15 parts of blast furnace slag with a particle size of 30 μm, 32 parts of carbide slag with a particle size of 80 μm, 12 parts of zeolite powder with a particle size of 100 meshes, 15 parts of modified fiber, 1 part of calcium carbonate, 0.01 parts of sodium dodecylbenzene sulfonate, 1 part of sodium lignin sulfonate, and 45 parts of water; The modified fiber comprises nickel-plated carbon fiber and aramid fiber in a mass ratio of 1:19; the nickel-plated carbon fiber has a diameter of 7.7 μm and a length of 3 mm; the aramid fiber has a diameter of 7 μm and a length of 3 mm; The method for preparing high-strength concrete for PC components comprises the following steps: The components of concrete are mixed to obtain concrete.

[0022] Example 2 High-strength concrete for PC components, comprising the following components in parts by weight: 100 parts of cement, 20 parts of blast furnace slag with a particle size of 50 μm, 42 parts of carbide slag with a particle size of 100 μm, 18 parts of zeolite powder with a particle size of 150 meshes, 25 parts of modified fiber, 5 parts of calcium carbonate, 0.015 parts of sodium dodecylbenzene sulfonate, 2 parts of sodium lignin sulfonate, and 55 parts of water; The modified fiber comprises nickel-plated carbon fiber and aramid fiber in a mass ratio of 19:1; the nickel-plated carbon fiber has a diameter of 7.7 μm and a length of 9 mm; the aramid fiber has a diameter of 10 μm and a length of 9 mm; The method for preparing high-strength concrete for PC components comprises the following steps: The components of concrete are mixed to obtain concrete.

[0023] Example 3 The high-strength concrete for PC components comprises the following components in parts by weight: 90 parts of cement, 18 parts of blast furnace slag with a particle size of 30 μm, 35 parts of carbide slag with a particle size of 80 μm, 16 parts of zeolite powder with a particle size of 200 meshes, 24 parts of modified fiber, 3 parts of calcium carbonate, 0.015 parts of sodium dodecylbenzene sulfonate, 1.5 parts of sodium lignin sulfonate, and 45 parts of water; The modified fiber components include nickel-plated carbon fiber and aramid fiber in a mass ratio of 5:1; the nickel-plated carbon fiber has a diameter of 7.7 μm and a length of 6 mm; the aramid fiber has a diameter of 20 μm and a length of 3 mm; The method for preparing high-strength concrete for PC components comprises the following steps: The components of concrete are mixed to obtain concrete.

[0024] Example 4 The only difference between this embodiment and embodiment 3 is that the components of the modified fiber include nickel-plated carbon fiber and aramid fiber in a mass ratio of 1:11.

[0025] Example 5 The only difference between this embodiment and embodiment 3 is that the components of the modified fiber include nickel-plated carbon fiber and aramid fiber in a mass ratio of 1:9.

[0026] Example 6 The only difference between this embodiment and embodiment 3 is that the components of the modified fiber include nickel-plated carbon fiber and aramid fiber in a mass ratio of 4:1.

[0027] Example 7 The only difference between this embodiment and embodiment 6 is that the modified fiber further comprises benzoic acid, and the mass of the benzoic acid is 0.1 times the total mass of the nickel-plated carbon fiber and the aramid fiber.

[0028] Example 8 The only difference between this embodiment and embodiment 6 is that the modified fiber also includes 4-decyloxybenzoic acid, and the mass of 4-decyloxybenzoic acid is 0.1 times the total mass of the nickel-plated carbon fiber and the aramid fiber; The preparation method of the modified fiber comprises the following steps: adding nickel-plated carbon fiber, aramid fiber and 4-decyloxybenzoic acid into a coupling agent solution, mixing, and drying to obtain the modified fiber. The coupling agent solution comprises coupling agent KH580 and ethanol in a mass volume ratio of 1 g:15 mL; the mass ratio of coupling agent KH580 and 4-decyloxybenzoic acid is 1:1; and the mass fraction of ethanol is 70%.

[0029] Example 9 The only difference between this embodiment and embodiment 8 is that the modified fiber also includes 4-decyloxybenzoic acid, and the mass of 4-decyloxybenzoic acid is 0.5 times the total mass of the nickel-plated carbon fiber and the aramid fiber.

[0030] Example 10 The difference between this embodiment and embodiment 8 is that the preparation method of the modified fiber includes the following steps: adding nickel-plated carbon fiber, aramid fiber, and 4-decyloxybenzoic acid to a coupling agent solution, mixing, and drying to obtain a modified fiber. The coupling agent solution includes coupling agent KH580 and ethanol in a mass volume ratio of 1 g:25 mL; the mass ratio of coupling agent KH580 to 4-decyloxybenzoic acid is 1:2; and the mass fraction of ethanol is 70%.

[0031] Comparative Example 1 The only difference between this comparative example and Example 3 is that the component of the modified fiber is nickel-plated carbon fiber.

[0032] Comparative Example 2 The only difference between this comparative example and Example 3 is that the modified fiber component is aramid fiber.

[0033] Comparative Example 3 The difference between this comparative example and Example 3 is that the modified fiber is replaced by 4-decyloxybenzoic acid.

[0034] Comparative Example 4 The only difference between this comparative example and Example 3 is that no modified fiber is added.

[0035] The concrete prepared in Examples 1 to 10 and Comparative Examples 1 to 4 were tested for performance: Compressive strength: 28d compressive strength test is carried out in accordance with the standard GB / T 50081-2019 "Test methods for physical and mechanical properties of concrete"; Wear resistance: Wear resistance test is carried out in accordance with the standard JTG 3420-2020 "Technical Guidelines for Construction of Highway Cement Concrete Pavement"; The results are shown in Table 1.

[0036] Table 1 Concrete performance test results

[0037] Compared with comparative examples 1 to 4, the concrete prepared in embodiments 1 to 10 has higher compressive strength and lower wear, indicating that the concrete adopts cement, blast furnace slag, carbide slag, zeolite powder, modified fiber and other components for synergy, especially the modified fiber components adopt nickel-plated carbon fiber and aramid fiber with a mass ratio of 1:19 to 19:1 for synergy, which significantly improves the strength and wear resistance of the concrete.

[0038] Compared with Examples 3 to 4, the concrete prepared in Examples 5 to 6 has higher compressive strength and lower wear, indicating that by adjusting the components of the modified fiber, when the mass ratio of nickel-plated carbon fiber to aramid fiber is 1:9 to 4:1, the strength and wear resistance of the concrete are further improved.

[0039] Compared with Examples 6 to 7, the concrete prepared in Examples 8 to 10 has higher compressive strength and lower abrasion, indicating that the components of the modified fiber include 4-decyloxybenzoic acid, and that the nickel-plated carbon fiber and aramid fiber are modified by 4-decyloxybenzoic acid, thereby further improving the strength and wear resistance of the concrete.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength concrete for PC components, It is characterized in that The invention comprises the following components in parts by weight: 90-100 parts of cement, 15-20 parts of blast furnace slag, 32-42 parts of carbide slag, 12-18 parts of zeolite powder, 15-25 parts of modified fiber, 1-5 parts of early strength agent, 0.01-0.015 parts of air entraining agent, 1-2 parts of water reducing agent and 45-55 parts of water; The modified fiber comprises nickel-plated carbon fiber and aramid fiber in a mass ratio of 1:19 to 19:

1.

2. The high-strength concrete for PC components according to claim 1, It is characterized in that The mass ratio of the nickel-plated carbon fiber to the aramid fiber is 1:9-4:

1.

3. The high-strength concrete for PC components according to claim 1, It is characterized in that The modified fiber also includes 4-decyloxybenzoic acid as a component.

4. The high-strength concrete for PC components according to claim 3, It is characterized in that The preparation method of the modified fiber comprises the following steps: adding the nickel-plated carbon fiber, aramid fiber and 4-decyloxybenzoic acid into a coupling agent solution for mixing, and drying to obtain the modified fiber.

5. The high-strength concrete for PC components according to claim 4, It is characterized in that The components of the coupling agent solution include a coupling agent and a solvent in a mass volume ratio of 1 g:15-25 mL; the mass ratio of the coupling agent to the 4-decyloxybenzoic acid is 1:1-2.

6. The high-strength concrete for PC components according to claim 4, It is characterized in that The mass of the 4-decyloxybenzoic acid is 0.1 to 0.5 times the total mass of the nickel-plated carbon fiber and the aramid fiber.

7. The high-strength concrete for PC components according to claim 1, It is characterized in that The particle size of the blast furnace slag is 30-50 μm; the particle size of the carbide slag is 80-100 μm; the particle size of the zeolite powder is 100-200 meshes; the diameter of the modified fiber is 7-20 μm, and the length is 3-9 mm.

8. The high-strength concrete for PC components according to claim 1, It is characterized in that The early strength agent includes one or two of carbonate and chloride; the air entraining agent includes one or two of alkylbenzene sulfonate and fatty alcohol sulfonate; the water reducing agent includes one or two of lignin sulfonate and polycarboxylate.

9. A method for preparing high-strength concrete for PC components according to any one of claims 1 to 8, It is characterized in that The following steps are involved: The components of the concrete are mixed to obtain concrete.

10. Use of the high-strength concrete for PC components according to any one of claims 1 to 8 or the concrete prepared by the preparation method according to claim 9 in PC components.

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