KR102197605B1 - Fiber reinforcement and method of reinforcing concrete structure using the same - Google Patents

Abstract

The present invention relates to a fiber reinforcing material with an excellent chemical resistance and a method of reinforcing a structure by using the fiber reinforcing material. According to the present invention, the fiber reinforcing material includes: a reinforcing fiber (11) which is at least one of a carbon fiber or an aramid fiber; and a main fiber (13) which is a basalt fiber (12) or a fiber formed by mixing the basalt fiber (12) with a glass fiber or mixing the basalt fiber (12) with a PET fiber.

Description

Fiber reinforcement and structural reinforcement method using the same {FIBER REINFORCEMENT AND METHOD OF REINFORCING CONCRETE STRUCTURE USING THE SAME}

The present invention relates to the field of construction, and more particularly, to a fiber reinforcement and a structure reinforcement method using the same.

As concrete structures are deteriorating, old structures that cannot support the initial design load are increasing.

Old buildings sometimes exceed the design load during use change and remodeling, and in the case of old bridges, there is a problem that the vehicle load increases compared to the load at the time of initial design.

In recent years, the shape of concrete structures has been diversified and complicated, and as the remodeling of the building structure becomes active, there are cases in which the load increases than the load at the time of design, and the strength of the beams, slabs, and columns of the building structure must be improved Is occurring.

In 1990, Korea applied seismic-resistance-related regulations to the Building Law, and has continuously revised related regulations. In 2005, the regulations were reinforced and revised in order to realize earthquake-resistant regulations. However, since the revised seismic design regulations are applied only to new buildings, building structures built prior to the introduction of the seismic design regulations were designed and constructed without considering the effects of earthquakes.

Some of the buildings that do not reflect the seismic design have been remodeled and rebuilt, but there are still many old buildings that do not reflect the seismic design regulations in Korea. Therefore, it is expected that in the event of an earthquake, building structures that do not reflect the seismic design regulations will suffer damage from collapse and damage.

To prevent this, a method of reinforcing old structures so that damage does not occur even with excessive loads is used. The most commonly used reinforcement methods are the steel plate reinforcement method and the fiber sheet reinforcement method.

The steel plate reinforcement method is a method that improves stiffness by bonding steel plates to the surface of a concrete structure, and although it is the most applied method, there has been a problem that heavy equipment is required at work and vulnerable to corrosion due to the heavy self-weight of the steel plate.

The fiber sheet reinforcement method has the advantage that the reinforcing member is light and easy to handle, but the carbon fiber, which is most commonly used as a fiber sheet, is expensive and has the property of a conductor, which makes it difficult to construct in places where high-voltage current flows. have.

In addition, although the cost of glass fiber is relatively inexpensive compared to carbon fiber, there are problems that the safety of workers due to glass dust is poor when cutting fibers, chemical resistance and fire resistance are poor, and there are problems that may pollute the environment when discarded. .

The present invention produces a fiber sheet with a light weight, but has excellent chemical resistance and fire resistance, improves the safety of the structure by improving the seismic performance, and prolongs the lifespan and provides a fiber reinforcement material that is economical and environmentally friendly. do.

In order to solve the above problems, the fiber reinforcement material of the present invention is a reinforcing fiber 11, basalt fiber 12, which is at least one of carbon fiber or aramid fiber, or the basalt fiber 12 and glass fiber or the basalt fiber 12 Including a main fiber 13 formed by mixing and PET fibers, wherein the reinforcing fibers 11 and the main fibers 13 are arranged side by side in a volume ratio of 1: 1 to 2: 10 ); Is formed under the first layer 100, the basalt fiber 12, the carbon fiber, the glass fiber, the aramid fiber, the PET in a direction orthogonal to the fiber arrangement direction of the first layer 100 A second layer 200 formed by arranging at least one of the fibers; The basalt fiber 12, the carbon fiber, the glass fiber, the basalt fiber 12, the carbon fiber, the glass fiber, which is formed under the second layer 200 and has the same inclination of 30 to 60° with the fibers arranged in the first layer 100 A third layer 300 formed by arranging at least one of aramid fibers and PET fibers; The basalt fiber 12, the carbon fiber, and the glass fiber are formed below the third layer 300 and have the same inclination of -30 to -60° to the fibers arranged in the first layer 100 , The aramid fiber, at least one of the PET fiber is arranged to form a fourth layer 400; includes.

The basalt fiber 12 is silicon dioxide (SiO ₂ ) 50 to 56% by weight; Aluminum oxide (Al ₂ O ₃ ) 15-20% by weight; Iron oxide (Fe ₂ O ₃ ) 8 to 13% by weight; 3 to 7% by weight of magnesium oxide (MgO); 1.5-5% by weight of sodium oxide (Na ₂ O); Potassium oxide (K ₂ O) 1 to 4% by weight; Titanium dioxide (TiO ₂ ) 1 to 4% by weight; Phosphorus pentoxide (P ₂ O ₅ ) 0.1 to 0.4% by weight; Manganese oxide (MnO) 0.1 to 0.3% by weight; It is preferred to include; chromium oxide (Cr ₂ O ₃ ) 0.02 to 0.08% by weight.

The glass fiber is silicon dioxide (SiO ₂ ) 50 to 56% by weight; Aluminum oxide (Al ₂ O ₃ ) 12 to 16% by weight; 1-6% by weight of magnesium oxide (MgO); Potassium oxide (K ₂ O) 19-25% by weight; It is preferable to include; boron oxide (B ₂ O ₃ ) 5 to 10% by weight.

The width is 5 ~ 2000 mm, the thickness is preferably made of 0.1 ~ 10mm.

The nonwoven fabric 500 is brought into contact with the lower surface of the fourth layer 400, and the first layer 100, the second layer 200, the third layer 300, the fourth layer 400, It is preferable that the fiber reinforcing material (A) formed of the nonwoven fabric 500 is impregnated with the epoxy resin 10 and then the epoxy resin 10 is cured.

In the nonwoven fabric 500, a tensile force is introduced before the epoxy resin 10 is cured, and the epoxy resin 10 is cured in a state in which the tensile stress remains in the nonwoven fabric 500.

The structure reinforcement method using a fiber reinforcement material (A) according to an embodiment of the present invention includes a surface treatment step of surface-treating the surface of the structure (1) using a hand grinder; A cleaning step of cleaning the surface of the structure 1 using an air gun; Attaching a fiber reinforcement material to install the fiber reinforcement material (A) using an adhesive or anchor; It includes; a finishing material coating step of applying a finishing material to the surface of the fiber reinforcement (A).

A structure reinforcement method using a fiber reinforcement material (A) according to another embodiment of the present invention includes a surface treatment step of surface-treating the surface of the structure (1) using a hand grinder; A cleaning step of cleaning the surface of the structure 1 using an air gun; Anchor hole forming step of forming an anchor hole (h) in the fiber reinforcement (A); A fiber reinforcement fixing step of fixing the fiber reinforcement material (A) to the structure (1) by installing an anchor in the anchor hole (h); An epoxy coating step of applying epoxy such that the edge of the fiber reinforcement material (A) is in contact with the structure (1); And an epoxy injection step of injecting epoxy into the surface joint (S) of the structure (1) and the fiber reinforcement (A).

The fiber reinforcement material of the present invention has an advantage of being easy to handle because of its light weight, and excellent chemical resistance and fire resistance.

1 is a diagram of a first layer according to an embodiment of the present invention
2 is a diagram of a second layer according to an embodiment of the present invention
3 is a diagram of a third layer according to an embodiment of the present invention
4 is a diagram of a fourth layer according to an embodiment of the present invention
5 is a view of a fiber reinforcement according to an embodiment of the present invention
Figure 6 is a side view of a fiber reinforcement according to an embodiment of the present invention
7 is a direct tensile test specimen according to an embodiment of the present invention, a specimen for the test of Table 1
8 is a direct tensile test specimen according to an embodiment of the present invention, a specimen for the test of Table 3
9 is a direct tensile test specimen according to an embodiment of the present invention, a photograph of the specimen for the test in Table 3
10 is a direct tensile test result according to an embodiment of the present invention, the test results in Table 3
11 is a view of a tensile test of a concrete beam for checking the reinforcing strength of a fiber reinforcement according to an embodiment of the present invention
12 is a test result for Table 6, test results for a test specimen having a circular cross section
13 is a test result for Table 6, the test result for a test specimen with a depth of cut of 20 mm in a rectangular cross section
14 is a test result for Table 6, the test result for a test specimen with a depth of cut of 10mm among a square cross section
15 is a test result for Table 7, the test result for the unreinforced test body
16 is a test result for Table 7, test results for a test specimen reinforced with carbon fiber
17 is a test result for Table 7, the test result for a test body reinforced with a fiber reinforcement according to an embodiment of the present invention
18 is a test result for Table 9
19 is a test result for Table 10
20 is a test result for Table 4

An embodiment of a fiber reinforcement according to the present invention and a structure reinforcing method using the same will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numbers, and A redundant description of this will be omitted.

In addition, terms such as first and second used hereinafter are merely identification symbols for distinguishing the same or corresponding elements, and the same or corresponding elements are limited by terms such as first and second. no.

In addition, the term “couple” does not mean only a case in which each component is in direct physical contact with each other in the contact relationship between each component, but a different component is interposed between each component, and the component is It should be used as a concept that encompasses each contact.

Hereinafter, a fiber reinforcement and a structure reinforcing method using the same will be described in detail with reference to the accompanying drawings.

The fiber reinforcement of the present invention is formed by mixing at least one of carbon fiber or aramid fiber, reinforcing fiber 11, basalt fiber 12 or basalt fiber 12 and glass fiber or basalt fiber 12 and PET fiber. Including the main fibers 13, the reinforcing fibers 11 and the main fibers 13 are 1: 1 to 2: a first layer 100 arranged side by side in a volume ratio of 10; Is formed under the first layer 100, in a direction orthogonal to the fiber arrangement direction of the first layer 100, at least one or more of basalt fiber 12, carbon fiber, glass fiber, aramid fiber, PET fiber A second layer 200 arranged and formed; Is formed under the second layer 200, basalt fiber 12, carbon fiber, glass fiber, aramid fiber, PET fiber so that the inclination of 30 ~ 60 ° is the same to the fibers arranged in the first layer 100 A third layer 300 formed by arranging at least one or more; Is formed on the lower side of the third layer 300, basalt fiber 12, carbon fiber, glass fiber, aramid fiber, PET so that the inclination of -30 ~ -60° is the same to the fibers arranged in the first layer 100 And a fourth layer 400 formed by arranging at least one of the fibers.

In this case, the fiber reinforcement of the present invention is a sheet reinforcement made of four layers, and the basalt fiber 12 and the reinforcing fiber 11 are mixed in the first layer.

Layers 2, 3, and 4 have the characteristics of being arranged in a direction perpendicular to the fiber arrangement direction of the first layer, an inclination direction of 30 to 60°, and an inclination direction of -30 to -60°. Through the arrangement structure of the fiber reinforcement of the present invention is superior to the reinforcing material formed of a single fiber has excellent deformation rate and excellent fire resistance.

Basalt fiber 12 is silicon dioxide (SiO ₂ ) 50 to 56% by weight; Aluminum oxide (Al ₂ O ₃ ) 15-20% by weight; Iron oxide (Fe ₂ O ₃ ) 8 to 13% by weight; 3 to 7% by weight of magnesium oxide (MgO); 1.5-5% by weight of sodium oxide (Na ₂ O); Potassium oxide (K ₂ O) 1 to 4% by weight; Titanium dioxide (TiO ₂ ) 1 to 4% by weight; Phosphorus pentoxide (P ₂ O ₅ ) 0.1 to 0.4% by weight; Manganese oxide (MnO) 0.1 to 0.3% by weight; It is preferred to include; chromium oxide (Cr ₂ O ₃ ) 0.02 to 0.08% by weight. In this case, since the basalt fiber 12 contains a large amount of silicon dioxide, the fire resistance performance is improved.

Glass fiber is silicon dioxide (SiO ₂ ) 50 to 56% by weight; Aluminum oxide (Al ₂ O ₃ ) 12 to 16% by weight; 1-6% by weight of magnesium oxide (MgO); Potassium oxide (K ₂ O) 19-25% by weight; It is preferable to include; boron oxide (B ₂ O ₃ ) 5 to 10% by weight.

The fiber reinforcement according to the present invention is preferably manufactured with a width of 5 to 2000 mm and a thickness of 0.1 to 10 mm.

In addition, the fibrous reinforcement according to the present invention additionally contacts the nonwoven fabric 500 on the lower surface of the fourth layer 400, the first layer 100, the second layer 200, the third layer 300, and After impregnating the fiber reinforcement material (A) formed of the four-layer 400 and nonwoven fabric 500 into the epoxy resin 10, the epoxy resin 10 may be cured to form a hard panel structure.

This is because there are cases in which the structure needs to be reinforced with a hard panel structure. In particular, when applied to the underside of a structure or bridge girder exposed to high humidity, the fiber reinforcement may be coated with an epoxy resin 10 to prevent corrosion due to exposure to high humidity.

In the nonwoven fabric 500, tensile force is introduced before the epoxy resin 10 is cured, and the epoxy resin 10 is preferably cured while the tensile stress remains in the nonwoven fabric 500.

The structure reinforcement method using a fiber reinforcement material (A) according to an embodiment of the present invention includes a surface treatment step of surface-treating the surface of the structure (1) using a hand grinder; A cleaning step of cleaning the surface of the structure 1 using an air gun; Fiber reinforcement attaching step of installing a fiber reinforcement (A) using an adhesive or anchor; It includes; a finishing material coating step of applying a finishing material to the surface of the fiber reinforcement (A).

The structure reinforcement method using the fiber reinforcement material (A) according to the embodiment of the panel structure coated with the epoxy resin 10 includes a surface treatment step of surface treatment of the surface of the structure 1 using a hand grinder; A cleaning step of cleaning the surface of the structure 1 using an air gun; Anchor hole forming step of forming an anchor hole (h) in the fiber reinforcement (A); A fiber reinforcement fixing step of fixing the fiber reinforcement (A) to the structure (1) by installing an anchor in the anchor hole (h); The most epoxy coating step of applying epoxy such that the edge of the fiber reinforcement material (A) is in contact with the structure (1); And an epoxy injection step of injecting epoxy into the surface joint (S) of the structure (1) and the fiber reinforcement (A).

Table 1 below shows the present inventors fibrous reinforcement (Example) and reinforcement made of carbon fiber (Comparative Example 1), reinforcement made of aramid fiber (Comparative Example 2), and reinforcement made of glass fiber (Comparative Example 3). As a result of the direct tensile test, it is a test result for the strain rates of Examples and Comparative Examples. The tensile test specimen was tested using the specimen shown in FIG. 7.

Fiber Strain
(%) Density
(g/㎟) Example 2.7 0.0027 Comparative Example 1 1.16 0.0018 Comparative Example 2 2.43 0.00144 Comparative Example 3 1.28 0.00254

Table 2 below shows the mixing ratio for determining the mixing ratio of the basalt fiber 12 and the carbon fiber 11, and Examples 2 to 8 show the mixing ratio of the basalt fiber 12 and the carbon fiber 11 will be. The mixing ratio is calculated by volume ratio.

Psalter Basalt fiber/carbon fiber
by volume Carbon fiber
(EA)㎟ Basalt fiber
(EA)㎟ Epoxy /
fiber by volume Example 2 1.0 (10)4.44 (10)4.44 1.5 Example 3 5.0 (3)1.33 (15)6.65 Example 4 6.0 (3)1.33 (18)7.98 Example 5 7.0 0.89(2) (14)6.23 Example 6 8.0 0.89(2) (16)7.12 Example 7 9.0 0.89(2) (18)8.01 Example 8 10.0 0.89(2) (20)8.9

The direct tensile test results for Examples 2 to 8 are shown in FIG. 10, and it was confirmed that the strength of Example 6 was the best. Example 6 is an example in which the volume ratio of basalt fiber/carbon fiber is 8. The test specimen for this test is as shown in FIG. 8, and the specimen fabrication is illustrated in FIG. 9.

Table 3 below shows the direct tensile test results for Examples 2 to 8.

weight
(N) Displacement
(mm) Cross-sectional area
(㎟) The tensile strength
(MPa) Strain
(%) Example 2 17,349 7.53 8.9 1,949 3.01 Example 3 16,250 8.18 8.0 2,032 3.27 Example 4 18,406 7.74 9.3 1,973 3.10 Example 5 14,457 7.71 7.1 2,034 3.08 Example 6 16,966 8.27 8.0 2,122 3.31 Example 7 13,760 7.82 8.9 1,549 3.13 Example 8 15,300 8.59 9.8 1,566 3.44

As a result of the experiment, as shown in Table 3, when the ratio of basalt fiber and carbon fiber is 7: 1 ~ 8: 1, it shows a ductile failure pattern in which the strain increases without increasing the load after the maximum load.

Table 4 below is a test result for confirming the reinforcing effect of the present invention and carbon fiber, and is a test result of installing the reinforcing fiber and carbon fiber of the present invention on a reinforced concrete beam. The beam cross-section was 200(B)×200(H)mm, the beam length was 2m, and the test front diameter is as shown in FIG.

As shown in Fig. 11, it is set on a tensile testing machine, and the reinforcement of the fibers is installed on the upper surface of the beam subjected to tension.

Test body Reinforcement Yield load
(kN) Load
(kN) Remark Reference test body - 66.69 81.76 100% Carbon fiber reinforcement 1 ply 65.25 87.84 107% The present invention
Fiber reinforcement reinforcement BF: 8 ply
CF: 1 ply 68.25 88.24 108%

Tables 5 and 6 are tests to confirm the inner restraint effect of the fiber reinforcement of the present invention installed on the outer circumferential surface of the column, which is a compression member, after making a column specimen of circular and square section and wrapping the fiber reinforcement on the outer circumference of the specimen. This is the result of testing the compressive strength. The specimen of the square section was rounded after cutting in order to prevent the fiber lifting phenomenon at the corners and angled portions during transverse reinforcement, and the cutting depths were 10mm and 20mm.

The fiber reinforcement of Example 6 was applied to the fiber reinforcement of the present invention applied to the test of Table 5 below.

In Table 5, no reinforcement means that the fiber reinforcement is not installed on the outer circumference of the specimen, and the reinforcement is that the fiber reinforcement is installed.

division Cross-sectional shape Cutting depth
(mm) Fiber used Fiber ratio No reinforcement circle - - - Square 10 20 Reinforcement circle - Carbon fiber + basalt fiber Carbon Fiber(1)
Basalt Fiber(8) Square 10 20

division Unreinforced concrete Reinforced concrete Fiber reinforcement effect Compressive strength
(MPa) Compression strain
(%) Compressive strength
(MPa) Compression strain
(%) Strength increase Ductility increase circle 30.08 0.24% 34.14 1.38% 1.1 5.8 Square
(Cutting depth 20mm) 27.79 0.26% 29.52 0.45% 1.1 1.7 Square
(Cutting depth 10mm) 25.85 0.25% 27.69 0.31% 1.1 1.2

As shown in Table 6, it can be seen that the concrete specimen reinforced with fiber reinforcement increased the compressive strength and increased ductility compared to the unreinforced specimen.

Table 7 below is a test to determine the degree of seismic performance improvement of the structure reinforced with the fiber reinforcement and carbon fiber of Example 6. When the fiber reinforcement is not installed (no reinforcement), the test specimen is reinforced with one layer of carbon fiber. These are the test results for a total of three cases, a carbon fiber reinforced test body and a test body to which Example 6 of the present invention was applied.

As a result of the test, the maximum load of the specimen reinforced with carbon fiber was 172kN, and the displacement at the maximum load was 78.4mm. The maximum load of the specimen to which the example was applied was 174kN, and the maximum displacement was 98.5mm. Comparing the maximum load of the unreinforced test body, the test body reinforced with carbon fiber, and the test body to which the example of the present invention was applied, the reinforcement performance was similar to 116% and 117%, respectively, but the ductility index was 9.8 and 10.9, respectively. It is possible to confirm the high ductility index of the specimen to which 6 is applied.

Specimen Reinforcement Yield load
(MPa) Yield displacement
(mm) Load
(kN) Maximum displacement
(mm) Ductility index
(Maximum displacement/yield displacement) No reinforcement - 132 12.0 148 49.4 4.12 Carbon fiber CF 1-ply 105 8.0 172 78.4 9.8 Reinforcement application of the present invention Example 6 110 9.0 174 98.5 10.9

Table 8 below is a test result confirming alkali resistance and heat resistance for the carbon fiber, glass fiber, and fiber reinforcement of the present invention to which Example 6 is applied.

As for the experimental conditions, the temperature condition was set to 60°C for the purpose of promoting deterioration. In addition, a 5% NaOH solution was used for the alkali solution for the alkali resistance test so as to enable the test at a high alkali concentration. The immersion period was set to 7, 14, 21, and 28 days, respectively, and after the period, it was taken out from the fiber immersion solution, washed in distilled water, dried for 1 day, and then subjected to a tensile strength test to check the change in strength.

In the case of heat resistance test, the tensile strength after setting the environmental temperature using a high-temperature electric furnace for each fiber to 100℃, 200℃, 400℃, and 600℃, expose them at these temperatures for about 2 hours, and leave at room temperature for 1 day. The test was conducted to confirm the change in strength.

Fiber type durability
Kinds Deterioration
Condition Number of test pieces Carbon fiber Alkali resistance NaOH
(Concentration: 5%, Temperature: 60℃)
(Sedimentation period: 7, 14, 21, 28 days) 10 each Heat resistance High-temperature electric furnace (heating: 2 hours)
100℃~600℃ Fiberglass Alkali resistance NaOH
(Concentration: 5%, Temperature: 60℃)
(Sedimentation period: 7, 14, 21, 28 days) Heat resistance High-temperature electric furnace (heating: 2 hours)
100℃~600℃ The present invention
Application of Example 6 Alkali resistance NaOH
(Concentration: 5%, Temperature: 60℃)
(Sedimentation period: 7, 14, 21, 28 days) Heat resistance High-temperature electric furnace (heating: 2 hours)
100℃~600℃

Table 9 below shows the tensile strength and strength change rate test results.In the case of glass fiber, the strength change rate after immersion for 28 days was about 21.4%, and in the case of the present invention, the strength change rate was 30.5%, which is better than glass fiber. there was.

In the case of carbon fiber, it was confirmed that there was little change in tensile strength, so that the erosion effect due to alkali was relatively small compared to other fibers.

Immersion days


Fiber type Tensile strength (MPa)
(Intensity change rate (%)) 0 days 7 days 14 days 21 days 28 days Carbon fiber 1,970
(100) 1,945
(98.7) 1,931
(98.0) 1,904
(96.6) 1,902
(96.6) Fiberglass 858
(100) 575
(67.2) 395
(46.1) 275
(31.8) 180
(21.4) The present invention
Application of Example 6 704
(100) 476
(67.7) 354
(50.3) 232
(33.0) 215
(30.5)

Table 10 below is a result of evaluating the heat resistance. As a result of the experiment, it was confirmed that the deterioration tendency due to temperature increase began to appear clearly from the condition of 400°C or higher, and the strength deterioration due to exposure to high temperature was remarkable for both carbon fiber and glass fiber.

When Example 6 of the present invention was applied, it was confirmed that the change in strength was maintained up to 90% even under high temperature conditions up to 600°C, so that heat resistance due to high temperature exposure was relatively superior to other fiber materials.

Exposure temperature


Fiber type Tensile strength (MPa)
(Intensity change rate (%)) 20℃ (room temperature) 100℃ 200℃ 400℃ 600℃ Carbon fiber 1,970
(100) 1,931
(98.2) 1,891
(95.9) 1,619
(82.2) 1,206
(61.2) Fiberglass 858
(100) 841
(98.1) 807
(94.3) 611
(71.2) 482
(56.2) The present invention
Application of Example 6 704
(100) 697
(98.8) 701
(99.6) 690
(98.6) 648
(92)

P: Prestress 1: Structure
10: fiber 10: epoxy resin
11: reinforcing fiber 12: basalt fiber
100: first layer 200: second layer
300: 3rd layer 400: 4th layer

Claims (8)

Reinforcing fibers 11 which are at least one of carbon fibers or aramid fibers,
The basalt fiber 12 or the basalt fiber 12 and the glass fiber or the basalt fiber 12 and the PET fiber are mixed and formed to include a main fiber 13,
A first layer 100 in which the reinforcing fibers 11 and the main fibers 13 are arranged side by side in a volume ratio of 1:1 to 2:10;
Is formed under the first layer 100, the basalt fiber 12, the carbon fiber, the glass fiber, the aramid fiber, the PET in a direction orthogonal to the fiber arrangement direction of the first layer 100 A second layer 200 formed by arranging at least one of the fibers;
The basalt fiber 12, the carbon fiber, the glass fiber, and the aramid are formed under the second layer 200 and have an inclination of 30 to 60° to the fibers arranged in the first layer 100 A third layer 300 formed by arranging at least one or more of fibers and PET fibers;
The basalt fiber 12, the carbon fiber, the glass fiber, which is formed under the third layer 300 and has an inclination of -30 to -60° to the fibers arranged in the first layer 100, Including; a fourth layer 400 formed by arranging at least one or more of the aramid fibers and the PET fibers,
The basalt fiber 12 is
Silicon dioxide (SiO ₂ ) 50-56% by weight;
Aluminum oxide (Al ₂ O ₃ ) 15-20% by weight;
Iron oxide (Fe ₂ O ₃ ) 8 to 13% by weight;
3 to 7% by weight of magnesium oxide (MgO);
1.5-5% by weight of sodium oxide (Na ₂ O);
Potassium oxide (K ₂ O) 1 to 4% by weight;
Titanium dioxide (TiO ₂ ) 1 to 4% by weight;
Phosphorus pentoxide (P ₂ O ₅ ) 0.1 to 0.4% by weight;
Manganese oxide (MnO) 0.1 to 0.3% by weight;
Chromium oxide (Cr ₂ O ₃ ) 0.02 to 0.08% by weight; In addition,
The glass fiber is
Silicon dioxide (SiO ₂ ) 50-56% by weight;
Aluminum oxide (Al ₂ O ₃ ) 12 to 16% by weight;
1-6% by weight of magnesium oxide (MgO);
Potassium oxide (K ₂ O) 19-25% by weight;
Including; boron oxide (B ₂ O ₃ ) 5 to 10% by weight;
The nonwoven fabric 500 is brought into contact with the lower surface of the fourth layer 400, and the first layer 100, the second layer 200, the third layer 300, the fourth layer 400, After impregnating the fiber reinforcement material (A) formed of the nonwoven fabric 500 in the epoxy resin 10, the epoxy resin 10 is cured,
The nonwoven fabric 500 is
Fiber reinforcement, characterized in that the epoxy resin (10) is cured in a state in which a tensile force is introduced before the epoxy resin (10) is cured, and the tensile stress remains in the nonwoven fabric (500) .
delete delete The method of claim 1,
Fiber reinforcement, characterized in that the width is 5 ~ 2000 mm, the thickness is made of 0.1 ~ 10mm.
delete delete delete As a structural reinforcement method using the fiber reinforcement (A) of claim 1 or 4,
A surface treatment step of surface treatment of the surface of the structure 1 using a hand grinder;
A cleaning step of cleaning the surface of the structure 1 using an air gun;
Anchor hole forming step of forming an anchor hole (h) in the fiber reinforcement (A);
A fiber reinforcement fixing step of fixing the fiber reinforcement material (A) to the structure (1) by installing an anchor in the anchor hole (h);
An epoxy coating step of applying epoxy such that the edge of the fiber reinforcement material (A) is in contact with the structure (1);
An epoxy injection step of injecting epoxy into the surface joint (S) of the structure (1) and the fiber reinforcement (A).

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