Building structure reinforcing method based on mixed glass fiber-epoxy mortar

Abstract

The invention relates to the technical field of building structure reinforcement, in particular to a building structure reinforcement method based on mixed glass fiber-epoxy mortar, which comprises the following steps: mixing epoxy resin and a reactive diluent, adding a filler and glass fiber while stirring, and uniformly stirring to obtain a first component; adding a curing agent into the first component, and uniformly stirring to obtain glass fiber-epoxy mortar; a to-be-reinforced part in the building structure is cleaned, and the surface is polished with abrasive paper; putting the glass fiber-epoxy mortar into concrete spraying equipment, and spraying the ground surface of the building structure for multiple times; and maintaining for 7-28 days. According to the building structure reinforcing method based on the mixed glass fiber-epoxy mortar, the used glass fiber-epoxy mortar has excellent adhesive force, a flexible network structure composed of disulfide bonds facilitates self-repairing, meanwhile, the added filler improves tensile strength and abrasion resistance, and the excellent reinforcing effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of building structure reinforcement, in particular to a building structure reinforcement method based on mixed glass fiber-epoxy mortar. Background Art

[0002] At present, the aging of houses is becoming more and more serious. The problem of aging houses means that as the service life of houses increases, problems such as structural aging and material degradation will gradually emerge. Concrete structures and masonry structures face problems such as deterioration, insufficient strength, low durability and safety. With the development of economic construction, my country's requirements for the identification and reinforcement of existing industrial and civil buildings and disaster-stricken buildings are becoming increasingly urgent. For concrete structures, the common methods are: increasing the section method, replacing concrete reinforcement method, external steel method, prestressing method, changing the structural force transmission path method, bonding steel method, etc., FRP reinforcement method.

[0003] Masonry is a common building structure, which is mainly made of materials such as bricks, stones, and concrete blocks bonded together by mortar. This structure is widely used in residential and commercial buildings around the world, especially in traditional buildings and low-cost housing. The reinforcement methods of masonry structures include: adding structural columns and ring beams, adding steel mesh, replacing or repairing mortar, chemical grouting and floor reinforcement.

[0004] Epoxy mortar is a commonly used repair material in engineering. Epoxy mortar is often used to repair the surface of concrete structures, masonry structures, roads, and the processing of corrosion-resistant materials in some chemical plants. However, epoxy mortar has low tensile strength, and the bonding strength between the new and old materials after reinforcement is poor. After being stressed again, it will cause a "two-skin" phenomenon, and the self-healing performance is poor. Summary of the invention

[0005] The purpose of the present invention is to provide a method for reinforcing a building structure based on a mixed glass fiber-epoxy mortar, wherein the glass fiber-epoxy mortar used has excellent adhesion, wherein the flexible network structure composed of disulfide bonds facilitates self-repair, and at the same time, the added filler can increase the tensile strength and wear resistance, and has an excellent reinforcement effect.

[0006] To achieve the above object, the present invention provides a method for reinforcing a building structure based on a hybrid glass fiber-epoxy mortar, comprising the following steps:

[0007] S1, taking epoxy resin and reactive diluent and mixing them, adding filler and glass fiber while stirring, and stirring evenly to obtain a first component;

[0008] S2, adding a curing agent to the first component and stirring evenly to obtain a glass fiber-epoxy mortar;

[0009] S3. Clean the part of the building structure to be reinforced and polish the surface with sandpaper;

[0010] S4, placing the glass fiber-epoxy mortar in S2 into a shotcrete device, and spraying the polished surface of the building structure multiple times;

[0011] S5. Use a scraper to level the uneven surfaces of the building structure, remove surface bubbles, and maintain for 7-28 days.

[0012] Preferably, in S1, the epoxy resin includes one or more of guaiacol-based epoxy resin, vanillin-based epoxy resin and bisphenol A-based epoxy resin.

[0013] Preferably, in S1, the length of the glass fiber is 1-10 mm, and the amount of glass fiber added is 0.6-1.0% of the volume of the glass fiber-epoxy mortar.

[0014] Preferably, in S1, the filler includes one or more of fine aggregate, fly ash, heavy calcium powder and iron powder.

[0015] Preferably, in S2, the mass ratio of epoxy resin, curing agent and filler is 3:1:19-30.

[0016] Preferably, in S2, the curing agent includes one or more of ethylenediamine, phthalic acid, a combination of aminated cyclodextrin and 1-amino-adamantane.

[0017] Preferably, in S2, the mass ratio of the curing agent to the epoxy resin is 1:1-3.

[0018] Preferably, in S3, the cleaning is to blow away impurities on the surface of the part to be reinforced in the building structure and wash away oil stains.

[0019] Preferably, in S4, the injection speed is 5-10 m / s and the injection angle is 60-80°.

[0020] Preferably, in S4, the single spraying thickness is 80-100 mm, and the total spraying thickness is 1-30 mm.

[0021] Therefore, the present invention adopts the above-mentioned building structure reinforcement method based on mixed glass fiber-epoxy mortar, and its beneficial effects are:

[0022] 1. The guaiacol-based epoxy resin or the vanillin-based epoxy resin undergoes a curing reaction with the amine group in the curing agent. The disulfide bonds in the vanillin-based epoxy resin or the disulfide bonds in the guaiacol-based epoxy resin and the disulfide bonds in the composition of the aminated cyclodextrin and 1-amino-adamantane together form a flexible network structure after curing, so that the cured glass fiber-epoxy mortar has self-repairing properties.

[0023] 2. The glass fiber-epoxy mortar provided by the present invention has excellent adhesion. The addition of fillers increases the hardness, corrosion resistance, wear resistance and compressive strength of the glass fiber-epoxy mortar. The glass fiber enhances the tensile strength and durability of the glass fiber-epoxy mortar and has good insulation properties.

[0024] 3. The reinforcement method provided by the present invention is widely used in domestic historical buildings, such as ancient city walls, ancient towns, etc.

[0025] The technical solution of the present invention is further described in detail below through embodiments. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with embodiments. Unless otherwise defined, the technical terms or scientific terms used in the present invention should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The above-mentioned features or features mentioned in the specific examples mentioned in the present invention can be combined arbitrarily, and these specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0027] Example 1

[0028] The present invention provides a building structure reinforcement method based on mixed glass fiber-epoxy mortar, comprising the following steps:

[0029] S1, taking epoxy resin and reactive diluent and mixing them, adding filler and glass fiber while stirring, and stirring evenly to obtain a first component;

[0030] In S1, the epoxy resin is a guaiacol-based epoxy resin.

[0031] In S1, the length of the glass fiber is 6 mm, and the amount of glass fiber added is 1.0% by volume of the glass fiber-epoxy mortar.

[0032] In S1, the filler is a mixture of 5.0-10.0 mm fine aggregate, fly ash and iron powder in a mass ratio of 1:0.5:0.3.

[0033] S2, adding a curing agent to the first component and stirring evenly to obtain a glass fiber-epoxy mortar;

[0034] In S2, the mass ratio of epoxy resin, curing agent and filler is 3:1:24.

[0035] In S2, the curing agent is a composition of aminated cyclodextrin and 1-amino-adamantane, and the molar ratio of the two is 1:1.

[0036] In S2, the mass ratio of curing agent to epoxy resin is 1:2.

[0037] S3. Clean the part of the concrete structure to be reinforced. Cleaning includes blowing away impurities on the surface of the part of the concrete structure to be reinforced, washing away oil stains, and then polishing the surface with sandpaper.

[0038] S4. Put the glass fiber-epoxy mortar in S2 into the shotcrete equipment, with a spraying speed of 8m / s and a spraying angle of 70°. The polished concrete structure surface is sprayed multiple times, with a single spraying thickness of 80mm. The total spraying thickness is determined to be 1-30mm according to the degree of reinforcement of the concrete structure.

[0039] S5. Use a scraper to level the uneven surface of the concrete structure, remove surface bubbles, and cure for 7-28 days.

[0040] Example 2

[0041] The present invention provides a building structure reinforcement method based on mixed glass fiber-epoxy mortar, comprising the following steps:

[0042] S1, taking epoxy resin and reactive diluent and mixing them, adding filler and glass fiber while stirring, and stirring evenly to obtain a first component;

[0043] In S1, the epoxy resin is a vanillin-based epoxy resin.

[0044] In S1, the length of the glass fiber is 6 mm, and the amount of glass fiber added is 0.8% of the volume of the glass fiber-epoxy mortar.

[0045] In S1, the filler is a mixture of 5.0-10.0 mm fine aggregate, heavy calcium powder and iron powder in a mass ratio of 1:1:0.3.

[0046] S2, adding a curing agent to the first component and stirring evenly to obtain a glass fiber-epoxy mortar;

[0047] In S2, the mass ratio of epoxy resin, curing agent and filler is 3:1:24.

[0048] In S2, the curing agent is a composition of aminated cyclodextrin and 1-amino-adamantane, and the molar ratio of the two is 1:1.

[0049] In S2, the mass ratio of curing agent to epoxy resin is 1:2.

[0050] S3. Clean the part to be reinforced in the old masonry brick structure and polish the surface with sandpaper;

[0051] In S3, the cleaning is to blow away impurities on the surface of the part to be reinforced in the old masonry brick structure and wash away oil stains.

[0052] S4. Put the glass fiber-epoxy mortar in S2 into the shotcrete equipment, with a spraying speed of 6m / s and a spraying angle of 60°. The polished surface of the old masonry brick structure is sprayed multiple times. The single spraying thickness is 100mm, and the total spraying thickness is 1-30mm according to the degree of reinforcement of the old masonry brick structure.

[0053] S5. Use a scraper to level the uneven surfaces of old masonry brick structures, remove surface bubbles, and maintain for 7-28 days.

[0054] Test Case

[0055] The test is carried out according to standard GB / T9286-1998. The test results are graded according to integers from 0 to 5. The increasing value indicates the poorer adhesion. Grade 0 means intact, Grade 4 means that the layer is peeling off in large pieces along the cut edge, and / or some squares are partially or completely peeling off, and the affected cross-cut area is significantly greater than 35%, but not significantly greater than 65%. Grade 5 means that the degree of peeling exceeds Grade 4.

[0056] The adhesion test was performed on the building structure repaired in Example 1-2. The results are shown in Table 1. It can be seen that the glass fiber-epoxy mortar in Example 1-2 has excellent adhesion ability and continuously reinforces the building structure.

[0057] Example 1 Example 2 Adhesion(grade) 1 1

[0058] Therefore, the present invention adopts the above-mentioned method for reinforcing a building structure based on a mixed glass fiber-epoxy mortar. The glass fiber-epoxy mortar used has excellent adhesion, and the flexible network structure composed of disulfide bonds is convenient for self-repair. At the same time, the added filler increases the tensile strength and wear resistance and has an excellent reinforcement effect.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for reinforcing a building structure based on mixed glass fiber-epoxy mortar, characterized in that: The following steps are included: S1, taking epoxy resin and reactive diluent and mixing them, adding filler and glass fiber while stirring, and stirring evenly to obtain a first component; S2, adding a curing agent to the first component and stirring evenly to obtain a glass fiber-epoxy mortar; S3. Clean the part of the building structure to be reinforced and polish the surface with sandpaper; S4, placing the glass fiber-epoxy mortar in S2 into a shotcrete device, and spraying the polished surface of the building structure multiple times; S5. Use a scraper to level the uneven surfaces of the building structure, remove surface bubbles, and maintain for 7-28 days.

2. A building structure reinforcement method based on mixed glass fiber-epoxy mortar according to claim 1, characterized in that: In S1, the epoxy resin includes one or more of guaiacol-based epoxy resin, vanillin-based epoxy resin and bisphenol A-based epoxy resin.

3. A building structure reinforcement method based on mixed glass fiber-epoxy mortar according to claim 1, characterized in that: In S1, the length of the glass fiber is 1-10 mm, and the amount of glass fiber added is 0.6-1.0% of the volume of the glass fiber-epoxy mortar.

4. A building structure reinforcement method based on mixed glass fiber-epoxy mortar according to claim 1, characterized in that: In S1, the filler includes one or more of fine aggregate, fly ash, heavy calcium powder and iron powder.

5. A building structure reinforcement method based on mixed glass fiber-epoxy mortar according to claim 1, characterized in that: In S2, the mass ratio of epoxy resin, curing agent and filler is 3:1:19-30.

6. A building structure reinforcement method based on mixed glass fiber-epoxy mortar according to claim 1, characterized in that: In S2, the curing agent includes one or more of ethylenediamine, phthalic acid, a combination of aminated cyclodextrin and 1-amino-adamantane.

7. A building structure reinforcement method based on mixed glass fiber-epoxy mortar according to claim 1, characterized in that: In S2, the mass ratio of the curing agent to the epoxy resin is 1:1-3.

8. A building structure reinforcement method based on mixed glass fiber-epoxy mortar according to claim 1, characterized in that: In S3, cleaning is to blow away impurities on the surface of the part to be reinforced in the building structure and wash away oil stains.

9. A building structure reinforcement method based on hybrid glass fiber-epoxy mortar according to claim 1, characterized in that: In S4, the injection speed is 5-10 m / s and the injection angle is 60-80°.

10. A building structure reinforcement method based on mixed glass fiber-epoxy mortar according to claim 1, characterized in that: In S4, the single spraying thickness is 80-100 mm, and the total spraying thickness is 1-30 mm.