WO2009116811A2

WO2009116811A2 - Construction method of chemical-resistant underground structures

Info

Publication number: WO2009116811A2
Application number: PCT/KR2009/001393
Authority: WO
Inventors: 김의연; 김두연; 김성호
Original assignee: Kim Eui Yeon; Kim Du Yeon; Kim Sung Ho
Priority date: 2008-03-20
Filing date: 2009-03-19
Publication date: 2009-09-24
Also published as: WO2009116811A3; KR100876225B1

Abstract

The invention relates to a construction method of chemical-resistant underground structures, which comprises: a pretreatment step, in which foreign materials on the surface of a concrete structure are removed; a primer layer coating step, in which a wet epoxy primer layer is coated over the surface of the concrete structure; a resin layer coating step, in which a first epoxy resin layer made out of a soft epoxy resin is laminated and coated over the primer layer; a reinforcement step, in which a glass fiber layer is laminated over the epoxy resin layer; an impregnation step, in which a second epoxy resin layer made out of a soft epoxy resin is impregnated over the glass fiber layer to impregnate the first and second epoxy resin layers on the glass fiber layer; and a surface treatment step, in which the second epoxy resin layer is subjected to surface treatment for finishing the construction. In an embodiment of the invention, an FRP process using an epoxy resin and glass fiber is applied to secure the chemical-protection or chemical-resistance property while avoiding adhesion deterioration, such that the corrosion of underground structures due to toxic chemical gases can be prevented in a most effective way, the lifespan of an underground concrete structure can be increased by improving weather resistance thereof, and the underground structures exhibit an excellent adhesion force even in a wet environment.

Description

Chemical resistance construction method of underground structure

The present invention relates to a chemical resistance construction method of underground structures, and more particularly, by impregnating a wet acid-resistant epoxy resin in glass fiber to prevent corrosion of concrete or steel structures due to harmful gases generated in underground waterways or oil pipelines. The present invention relates to a chemical resistance construction method of an underground structure that has excellent adhesion to wet surfaces, prevents cracking due to contraction and expansion of structures, and forms a construction layer having excellent acid resistance or alkali resistance to the harmful gases.

In general, a large amount of harmful gases are generated in underground structures such as underground wastewater treatment plants, oil storage tanks, or underground waterways, and in such an environment, the corrosion of concrete or steel structures forming the wastewater treatment plants, groundwater pipelines, oil pipelines, etc. is severe. Although a repair method has been developed, even with such a repair method, since the corrosion is severe and the neutralization reaction proceeds rapidly due to the acidic or alkaline acid of harmful gases generated in an environment such as a wastewater treatment plant, the facility maintenance has been difficult.

The repair method for underground structures used so far is to recover the cross section with polymer mortar or to apply tar epoxy paint to the wall of the structure.However, the waterproof layer is exfoliated due to moisture, or the oxidation reaction caused by harmful gases is severe. As a result, the service life is short and there is a problem that needs to be frequently repaired, and since the work is dangerous due to harmful gases even during the construction work, it is urgent to develop a construction method that can solve such problems.

Examining the chemical resistance construction method used so far, it is classified into four as follows.

1.Tar epoxy paint 3 times coating method

2. Inorganic elastic mortar reinforcement method

3. Synthetic resin panel reinforcement method

4. Lamination reinforcement method of carbon fiber and glass fiber

Looking at the above four methods,

First, the tar epoxy paint 3 times coating method is the most used for repair work because tar epoxy is good in acid resistance. Since the surface of underground structures should always be wet due to moisture, A good wet product should be used, but since the tar epoxy paint is a dry paint, there is a problem that the paint is peeled off the wall of the structure due to moisture. In addition, since the paint is oily, volatile organic solvents are mixed, which may cause a worker to get into a hallucinogenic state due to gas poisoning during the operation. Therefore, prepare a ventilation device thoroughly, and the worker should prepare a protective equipment thoroughly. Construction work must be carried out to prevent safety accidents.

Therefore, in order to prevent safety accidents due to hallucinations, water-soluble tar epoxy paints have been developed and used recently, but the water-based paints have a good curing condition on a dried surface, but moisture on the structure due to condensation in a humid underground space. Is wet, so that it is used in a state where the curing is not complete, a problem occurs that the coating layer of the paint is dissolved and removed.

Secondly, the inorganic elastic mortar reinforcement method is a method of reinforcing by mixing cement and aggregate with soft aqueous acrylic resin or water-based epoxy resin, and hardening does not occur when the structure is wet due to condensation. As a result, they have to be repaired frequently. In addition, in terms of workability, plastering in the underground space is not easy, and high maintenance costs are incurred. Acrylic resins are polymerized by moisture and are reduced to acrylic acid. The neutralization reaction causes the concrete surface to corrode, thus causing a problem that the reinforcing layer is adhered to the corroded surface layer and peeled off. Therefore, the above method is easy to use in dry areas, but there are many problems in reinforcement in wet areas underground.

Third, the synthetic resin panel reinforcement method is a method in which rubberized asphalt sheet or synthetic rubber sheet is padded on the surface of the structure, urethane resin is applied to the joint area, and glass fiber is bonded to each other. However, it is used where the extent of corrosion is wide and severe. According to the above method, since the panels are continuously joined together, the whole part is not integrated, and a phenomenon in which a joint part is opened and a phenomenon of lifting is likely to occur. In addition, there is a problem that the bending is severe, or the corner is a lot difficult to work, and the defect is severe.

Fourth, the carbon fiber and glass fiber laminate reinforcing method is a kind of FRP (Fiber Reinforced Polymer) method, and is a method performed by impregnating a hard epoxy resin into the glass fiber. However, since a hard epoxy resin is used as the coating material, when it is attached to the front surface of the structure and integrated, there is a problem that the shrinkage expandability (elongation) is insufficient and cracking occurs, or the paint is peeled off from the surface of the structure. Therefore, since the construction should be spaced apart from each other by a predetermined interval, in the places where the laminated reinforcement is not, the chemical resistance is weak and oxidation occurs badly. Therefore, the above method may be suitable as a method for reinforcing the exterior of the structure, but as a chemical resistance reinforcing method for the underground structure, there is a problem in that cracking occurs due to lack of elongation.

The four methods described above, the conventional chemical-resistant construction method has its disadvantages in various aspects, such as adhesion, chemical resistance, water resistance, flexibility, waterproof, neutralization reaction with concrete, crack generation, durability, life, etc. Therefore, there is a need for a chemical resistance construction method for underground structures suitable for underground structures.

The present invention is to solve the above problems, an object of the present invention is excellent adhesion to the wet surface by using the FRP method using a paint impregnated with glass fiber in the epoxy resin on the wall surface of underground structures such as underground sewerage and It is an object of the present invention to provide a method for constructing a chemically resistant underground structure that suppresses cracking resulting from contraction and expansion of a structure and has excellent chemical resistance to harmful gases.

The present invention is to solve the above problems, the present invention, in the chemical resistance construction method of the underground structure, the pre-treatment step of removing the foreign matter on the surface of the concrete structure pre-treatment; Primer layer coating step of coating a wet epoxy primer layer on the surface of the concrete structure; A resin layer coating step of laminating and coating a first epoxy resin layer made of a soft epoxy resin on the wet epoxy primer layer; A reinforcing step of laminating a glass fiber layer on the first epoxy resin layer; Impregnating a second epoxy resin layer made of a soft epoxy resin on the glass fiber layer to impregnate the glass fiber layer between the first epoxy resin layer and the second epoxy resin layer; And a surface treatment step of finishing the surface treatment of the second epoxy resin layer.

Here, the primer composition constituting the wet epoxy primer layer is made of a primer base and a primer curing agent, 100% by weight of the primer base, a multifunctional epoxy made of a bisphenol A-type epoxy resin alone or mixed with a bisphenol F-type epoxy resin It comprises 50 to 70% by weight of resin, 15 to 30% by weight of noblep epoxy resin, 10 to 20% by weight of reactive diluent, 3 to 4% by weight of permeability imparting agent, and 100% by weight of the primer curing agent is 30 It consists of 40 to 40% by weight, modified aromatic amine 60 to 70% by weight, the mixing ratio of the primer base and the primer curing agent is 2: 1 to 3: 1 is preferred to form a waterproof layer with adhesive and chemical resistance Do.

In addition, the soft epoxy resin composition constituting the first epoxy resin layer and the second epoxy resin layer comprises a resin main body and a resin curing agent, 100% by weight of the resin main body is bisphenol A type epoxy resin alone or bisphenol F type 30 to 40% by weight of a polyfunctional epoxy resin mixed with an epoxy resin, 20 to 30% by weight of a noblock epoxy resin, 15 to 20% by weight of a plastic resin, 10 to 30% by weight of an additive, and 100% of the resin curing agent % Comprises 25 to 35% by weight of modified aliphatic amines and 65 to 75% by weight of modified aromatic amines, wherein the blending ratio of the primer base and the primer curing agent is 2: 1 to 3: 1. It is preferable to form a waterproof layer having improved chemical resistance while suppressing the occurrence of cracks.

In addition, the plastic resin is preferably at least one of a urethane resin, an acrylic resin, a rubber resin, a petroleum resin, a fatty acid resin in order to impart ductility to the entire epoxy resin.

In addition, the additive is 10 to 15% by weight of the tackifier; Waterproofing layer having various properties consisting of at least one of 1-2 wt% antioxidant, 0.5-1.0 wt% stabilizer, 0.5-1.0 wt% defoaming agent, 1-2 wt% leveling agent, 5-7 wt% reactive diluent It is preferable to form.

In addition, the reactive diluent is preferably made of an aliphatic difunctional epoxy resin.

In addition, the tensile strength of the glass fiber layer is preferably a weft yarn and a slope of 50kg, 25.4mm or more, respectively.

Here, the pre-treatment step is a surface treatment step of surface treatment of the concave-convex after the surface treatment of the surface of the concrete structure at high pressure; An antirust step of performing an antirust treatment on the rebar exposed from the concrete structure; If there is a crack on the surface of the concrete structure, it comprises a putty step of filling a wet epoxy resin in the crack.

In addition, the chemical resistance construction method of the underground structure, after the impregnation step further comprises a top coating step of laminating a third epoxy resin layer made of a soft epoxy resin on the second epoxy layer, the surface treatment step is Surface treatment of the third epoxy resin layer is preferred to maintain the flatness of the top layer.

According to the present invention, or the chemicals that have been a problem in the conventional construction method applied for the internal reinforcement of underground structures such as underground concrete structures, steel structures, waste water boxes, oil storage tanks, oil pipelines, underground waterways, sewage boxes, underground cavity By applying FRP method using epoxy resin and glass fiber to solve chemical resistance and deterioration of adhesion, it is most effective to prevent corrosion of underground structures caused by harmful chemical gases and increase weather resistance to increase the life of underground concrete structures. And, even in the wet environment of the underground structure has the advantage of excellent adhesion.

1 and 2 are a flow chart sequentially showing a chemical resistance construction method of the underground structure according to an embodiment of the present invention

Figure 3 is a cross-sectional view showing a laminated structure of the chemical resistance waterproof layer formed by the chemical resistance construction method of the underground structure according to an embodiment of the present invention

Figure 4 is a cross-sectional view showing the structure of the sewer pipe to which the chemical resistant waterproof layer formed by the chemical resistance construction method of the underground structure according to an embodiment of the present invention

10: wet epoxy primer layer 20: first epoxy resin layer

30: glass fiber layer 40: second epoxy resin layer

100: chemical-resistant waterproof layer A: wastewater, oil

B: Hazardous gas layer C: Concrete structure

Hereinafter, with reference to the drawings, a chemical resistance construction method of the underground structure according to the present invention will be described.

1 and 2 are flow charts sequentially showing the chemical resistance construction method of the underground structure according to an embodiment of the present invention.

As shown in Figure 1, the chemical resistance construction method of the underground structure according to an embodiment of the present invention, pre-treatment step (S10), primer layer coating step (S20), resin layer coating step (S30), reinforcing step ( S40), the impregnation step (S50), including a surface treatment step (S60).

In addition, as shown in FIG. 2, the pretreatment step S10 includes a front treatment step S11, a rust prevention step S12, and a putty step S13.

In addition, although not shown in the drawings, the impregnation step (S50) may further comprise a top coating step.

Figure 3 is a cross-sectional view showing a laminated structure of the chemical resistant waterproof layer formed by the chemical resistance construction method of the underground structure according to an embodiment of the present invention.

As shown in FIG. 3, the laminated structure 100 of the chemically-resistant waterproof layer formed by the construction method includes a wet epoxy primer layer 10 and a first epoxy resin layer 20 sequentially on the surface of the concrete structure C. , Comprising a glass fiber layer 30, a second epoxy resin layer 40. In addition, although not shown in the drawings, a third epoxy resin layer (not shown) may be formed on the second epoxy resin layer 40.

Figure 4 is a cross-sectional view showing the structure of the sewer pipe to which the chemical resistance waterproof layer is applied.

As shown in Figure 4, the sewage pipe that is completed by the chemical resistance construction method of the underground structure according to the present invention, the chemical resistant waterproof layer (W) on the wall surface of the concrete or steel structure (B) flowing waste water or oil (A) ( 100) to protect the structure by preventing the harmful gas layer (B) generated by the waste water or oil (A) to directly penetrate the structure (B).

Hereinafter, the chemical resistance construction method according to the present invention will be described.

The pretreatment step (S10) is a step of pretreatment by removing foreign matter on the surface of the concrete structure.

Specifically, as shown in Figure 2, the pretreatment step (S10) according to an embodiment of the present invention after the surface treatment of the surface of the concrete structure at a high pressure, the front treatment step (S11) for the front surface treatment of the unevenness; Antirust step (S12) for performing a rust prevention treatment for the rebar exposed from the concrete structure; If there is a crack on the surface of the concrete structure, it comprises a putty step (S13) to fill the crack portion of the wet epoxy resin.

The front treatment step (S11) and the rust prevention step (S12) is to prevent the cross-sectional damage of the structure surface, chemical reactions due to deterioration, freezing thawing, abrasion action and the like.

First, the front processing step (S11) will be described. Concrete is porous and can be expected to have a physical wedge effect, which is quite good as a basis for coating, but a certain amount of frontal treatment is required to ensure adhesion between concrete and a coating or paint. This includes removing a substance to which a coating material is not attached or a substance which creases on the surface after construction and becomes a defect of a coating film. Another purpose of the frontal treatment is to remove defects on the surface to ensure a continuous coating. The unevenness of the deterioration site is treated flat, and the bare soil marks are filled with an appropriate filler material. In particular, the surface damaged by chemicals in underground structures should be plucked until normal concrete comes out and the salts on the surface should be removed cleanly. If water-soluble salts are present, it is a highly permeable coating such as polyurethane. Under immersion or high humidity conditions, swelling is likely to occur, so the salts should be sufficiently removed by washing with jet water if necessary.

The rust prevention step (S12) is to take corrosion control measures against corrosion of steel reinforcing bars existing in and out of the structure. Steels placed in the natural environment are corroded by electrochemical reactions. In this case, cathodes and anodes are generated in the steel under the conditions of the environment and the steel, and the cathode portions are corroded. There are a number of anti-rust treatment methods for suppressing such corrosion, the electrical method is the representative one of them. When direct current is applied to the corroded steel surface, the current enters the anode part first, and according to the amount of current, the potential of the anode becomes high and eventually becomes equal to the potential of the cathode. Therefore, the potential difference of the corrosion cell that originally occurred on the steel surface disappears. Corrosion is to be suppressed. The electric method includes a method of changing an alternating current to a direct current using a rectifier and a method of using a low metal depending on steel materials. The former is called an external power supply method and the latter is a dielectric anode method.

Putty step (S13) is performed when there is a crack on the surface of the structure, by injecting the wet epoxy primer composition to be described later to the crack, thereby forming an unevenness on the surface of the concrete structure when coating the chemical resistance waterproof layer To prevent it in advance. Putty step (S13) is performed by a conventional injection method or filling method

Primer layer coating step (S20) is to coat the wet epoxy primer layer 10 over the entire surface of the concrete structure. In the present invention, overcoming the strong alkalinity of the concrete, by applying a "wet epoxy" having a moisture resistance to configure a primer layer to exhibit a strong adhesive force even in a wet environment.

Underground structures such as underground wastewater boxes and underground industrial water transfer tunnels in underground spaces are always wet due to condensation. Therefore, when using general products, poor adhesion and peeling may occur due to moisture.

Specifically, in the case of wet concrete structures or stretch structures, the water content of the concrete is more than 6%, there was a problem that the peeling phenomenon easily occurs with a dry epoxy resin or urethane resin adhesive used in the prior art.

In the present invention, the problem of the peeling phenomenon has been solved by applying a wet epoxy resin, and the wet epoxy resin is based on bisphenol A or bisphenol F-based epoxy resin, and as a curing agent, a modified aliphatic amine-based curing agent and a modified aromatic amine are used. The material which improved permeability and adhesiveness was used by applying additives, such as a permeability imparting agent, to the composition containing system type hardening | curing agent.

When the wet epoxy primer layer 10 is applied, water molecules contained on the concrete base surface (A) as the adherend are extracted, and ion exchange is performed in which the epoxy resin is attached to the place, thereby maximizing adhesion. Therefore, the effect which prevents peeling phenomenon can be exhibited.

In addition, the concrete is a strong alkali (pH 12.5), the primer layer formed on the concrete base surface (A) should have a chemical resistance, and initially has a strong adhesion, but with carbon dioxide, chlorine ions over time Since the adhesive force may be sharply lowered due to oxidation or neutralization of the resin due to infiltration of a salt material, the adhesive force should be retained for a long time, and the wet epoxy primer layer 10 may be used to retain the chemical resistance and adhesive force. A waterproof layer can be achieved.

The wet epoxy primer layer 10 is preferably applied at 0.1 to 0.5kg / m ² . The primer composition constituting the wet epoxy primer layer 10 will be described later.

The resin layer coating step (S30) is a step of laminating and coating the first epoxy resin layer 20 made of a soft epoxy resin on the wet epoxy primer layer 10. The application of the soft epoxy resin is to solve the problem of cracking or peeling of the paint from the surface of the structure due to lack of shrinkage and expandability (elongation) of the conventional hard epoxy resin, and the soft applied to the present invention. In addition to the elongation, the epoxy resin uses a material having chemical resistance and salt resistance. The soft epoxy resin composition constituting the first epoxy resin layer 20 will be described later.

Reinforcing step (S40) is a step of laminating the glass fiber layer 30 on the first epoxy resin layer (20). Although the glass fiber layer 30 is stretched by the above-described soft epoxy resin coating, since the shrinkage and expansion of the cracked portion are continuously performed, the crack growth is likely to proceed even in the waterproof layer due to such fatigue phenomenon. It is installed to minimize the stress applied to the entire waterproof layer by dispersing.

The glass fiber reinforcing material used in the glass fiber layer 30 is excellent in workability of the glass fiber woven into the network structure, too tightly woven glass fiber is delayed air discharge, so there is a high possibility of generating air pockets, 0.5 to 2.5mm It is preferable to be woven in the mesh spacing of the size, it is preferable to use the product of the tensile strength of the weft and the warp is 50kg, 25.4mm or more, respectively.

In the impregnation step (S50), the second epoxy resin layer 40 made of a soft epoxy resin is laminated on the glass fiber layer 30, thereby forming the glass fiber layer 30 on the first epoxy resin layer 20 and the second epoxy resin layer. It is a step of impregnation between 40.

Specifically, the glass fiber layer 30 is installed on the first epoxy resin layer 20 through the reinforcement step S40. In the impregnation step S50, the second epoxy resin is coated on the epoxy resin with a roller or the like, and a constant pressure is applied thereto. As shown in FIG. 3, a laminated structure in which the glass fiber layer 30 is positioned between the first epoxy resin layer 20 and the second epoxy resin layer 40 can be formed.

Surface treatment step (S60) is a step of finishing the surface treatment of the second epoxy resin layer 40 located at the top. This is done by planarizing the unevenness of the uppermost layer, removing foreign matters on the surface, and the like.

Chemical resistance construction method of the underground structure according to the present invention can be carried out through the above steps, more preferably, after the impregnation step (S50) the third epoxy resin layer made of a soft epoxy resin on the second epoxy layer 40 It may be made by further comprising a top coating step (S55, not shown) for laminating the.

By further including the third epoxy resin layer, since the top layer can be planarized, the surface treatment step S60 can be made more neatly. In this case, of course, the surface treatment step S60 should be performed on the third epoxy resin layer instead of the second epoxy resin layer 40.

Next, the primer composition constituting the wet epoxy primer layer 10 and the soft epoxy resin composition constituting the first epoxy resin layer 20 and the second epoxy resin layer 40 will be described.

I. Primer composition

The primer composition constituting the wet epoxy primer layer 10 used in the present invention is made by mixing a primer main material and a primer curing agent without using an organic solvent, and 100% by weight of the primer main material is bisphenol A-type epoxy resin alone or 50 to 70% by weight of a multifunctional epoxy resin mixed with a bisphenol F-type epoxy resin, 15 to 30% by weight of a noblock epoxy resin, 10 to 20% by weight of a reactive diluent, and 3 to 4% by weight of a permeability imparting agent. 100 wt% of the primer curing agent includes 30 to 40 wt% of modified aliphatic amine and 60 to 70 wt% of modified aromatic amine, and the mixing ratio of the primer main agent and the primer curing agent is 2: 1 to 3: 1.

Examples of properties required for the primer include chemical resistance, adhesion, and moisture resistance. The main composition of the primer composition of the epoxy resin composition in the epoxy primer coating layer used in the present invention is bisphenol A-type epoxy resin alone or bisphenol F. By using a polyfunctional epoxy resin and a no-block epoxy resin mixed with a type epoxy resin, all three characteristics are provided, and in particular, when a bisphenol A-type epoxy resin, a bisphenol F-type epoxy resin, and a no-block type epoxy resin are mixed and used. It can maximize the chemical resistance.

In addition, by using a modified aliphatic amine curing agent and a modified aromatic amine curing agent, which is a primer curing agent used in the present invention, it is possible to maximize the adhesion to the wet surface. In addition, since the primer composition used in the present invention does not add an organic solvent, there is no problem of causing hallucinogenic symptoms due to generation of harmful gases due to solvent evaporation.

Since the primer of the present invention is intended to maintain adhesion to the wet surface, the water molecules and resins in the adherend are ion-exchanged, so that the resin is bonded instead of water, so that the adhesive strength should be 20kgf / cm ² or more in water. It is possible.

1. Primer motif

First, the meaning of the nature, role and content of the constituents of the subject will be examined. In the present invention, the main primer of the present invention mainly uses a bisphenol A-type epoxy resin, and a bisphenol F-type epoxy resin and a noblock epoxy resin can be appropriately mixed therein. The subject may further include a noblock epoxy resin, and may further include additives such as reactive diluents and permeability imparting agents.

First, the bisphenol A type and the bisphenol F type epoxy resins used as polyfunctional epoxy resins are examined. The former may be used as a main material in both, and the latter may be mixed and used suitably.

Bisphenol A-type epoxy resins, which are commonly used as the subject of epoxy resin compositions in water, play a role in the curing agent of the epoxy composition expressing adhesion and strength to concrete structures or steel structures, and have reactivity, plasticity, chemical resistance, adhesion, and toughness. Excellent high temperature characteristics.

Bisphenol F-type epoxy resin has excellent compatibility with other resins, and has excellent low-temperature curing properties. Here, it is mixed to supplement the properties of bisphenol A-type epoxy resin, and because of its low viscosity, epoxy is mixed with the inner surface of the water / sewer pipe. It is possible to further improve the adhesion.

Second, look at the noblock epoxy resin. The noblock epoxy resin is mainly attracting attention in the field of electrical and electronics, and is a resin having excellent chemical resistance and heat resistance, and in the present invention, it has been adopted in the present invention to increase chemical resistance. The noblock resin used for this invention may use any of a phenol and a cresol type | system | group.

When added to 15% by weight of the noble epoxy resin in the main 100% by weight, it is difficult to ensure the characteristics of the chemical resistance, when more than 30% by weight there is a problem that the workability deteriorates.

Third, the reactive diluent is used to lower the viscosity of the polyfunctional epoxy resin, and an aliphatic difunctional epoxy resin such as an aliphatic polyglycidyl ether is mainly used.

At 100% by weight, the reactive diluent is added at less than 10% by weight, and the effect of the viscosity dilution is halved, and when added at more than 20% by weight, the viscosity is so high that problems with adhesion in wet areas occur. .

Fourth, the permeability imparting agent is not particularly limited, but it is preferable to use a permeation imparting agent such as acetylenol cyclohexanol. Alternatively, in order to impart alkalinity to the permeability imparting agent to prevent neutralization of concrete, a permeation imparting agent made of lithium silicate (Li 2 SiO 3) as a main component and made of a pH 11 ± 0.5 strong alkaline aqueous solution may be used.

If the permeability imparting agent is added in less than 3% by weight of the main body 100% by weight, the property of imparting permeability or alkalinity is weakened, and when it exceeds 4% by weight, there is a problem that the adhesiveness may be weakened.

In consideration of the component content, if the polyfunctional epoxy resin is less than 50% by weight based on 100% by weight of the main body, the desired adhesive strength cannot be obtained.In the case of more than 70% by weight, the adhesive strength is good, but the epoxy condenses and the workability is improved. It becomes bad. In addition, in the ratio of bisphenol A type epoxy resin and bisphenol F type epoxy resin, it may be economical to use only bisphenol A type epoxy resin independently, and the ratio is 60:40 or less, and the ratio is 60:40 or less. If more is used, there is a problem that the indispensable adhesion, toughness, etc. are indispensable as the basic epoxy resin.

2. Primer hardener

Epoxy resins are rarely used alone, and used in combination with a curing agent to cure with a three-dimensional thermosetting material, the performance of which is largely dependent on the selection of the curing agent.

The curing agent is formed by mixing one or more modified aliphatic amine curing agents, alicyclic amine curing agents, modified aromatic amine curing agents, acid anhydride curing agents, and amidazole curing agents. The hardening | curing agent in this invention mixes and uses a modified aliphatic amine type hardening | curing agent and a modified aromatic amine type hardening | curing agent.

By using a modified aliphatic amine curing agent to minimize the shrinkage action of the epoxy resin composition to further improve the adhesion to the surface of the underground structure, by using a modified aromatic amine curing agent can impart soft properties to the entire resin.

If the modified aliphatic amine-based curing agent is contained in less than 30% by weight, it is difficult to secure the adhesion on the wet surface, on the contrary, when the modified aliphatic amine-based curing agent is contained in more than 40% by weight, it is difficult to give soft properties of the epoxy resin primer There is a problem.

In addition to the curing agent may further include a curing accelerator, the curing accelerator may be used at least one of phenol, cresol, nonylphenol, bisponol, polymercaptan, piperazine mixture.

When the mixing ratio of the main material and the curing agent is less than 2: 1, when the main content is less, the fluidity becomes difficult to secure, and when the main content is 3: 1 or more, the curing properties are poor.

II. Soft epoxy resin composition

Next, a soft epoxy resin composition constituting the first epoxy resin layer 20 and the second epoxy resin layer 40 will be described.

The soft epoxy resin composition used in the present invention comprises a resin main material and a resin curing agent, and 100% by weight of the resin main material is a multifunctional epoxy resin made of bisphenol A type epoxy resin alone or mixed with a bisphenol F type epoxy resin. It comprises 40 to 40% by weight, 20 to 30% by weight of the noblock epoxy resin, 15 to 20% by weight of the plastic resin, 10 to 30% by weight of the additive, 100% by weight of the resin curing agent, 25 to 35% by weight of the modified aliphatic amine It comprises 65 to 75% by weight of a modified aromatic amine, the mixing ratio of the primer base and the primer curing agent is 2: 1 to 3: 1.

1. Resin Theme

Among the materials constituting the resin main subject, the bisphenol A-type epoxy resin, the bisphenol F-type epoxy resin, and the noblock epoxy resin are the same as in the above-described primer composition, and the significance of the content is also the same. Here, only plastic resins and additives will be described.

(1) plastic resin

The plastic resin applied as the resin subject matter of the present invention is applied for the purpose of increasing plasticity by giving plasticity to epoxy resin. This is because epoxy resins are inherently hard in nature, and thus cracks are generated when the mother cracks. The plastic resin used in the present invention is to use the reactive resin polymerized in the epoxy resin rather than the non-reactive resin, it can enjoy the effect of preventing the solidification over time. The plastic resin used in the present invention is used alone or in combination with a urethane resin, acrylic resin, rubber resin, petroleum resin, fatty acid resin.

With respect to 100% by weight of the resin-based resin, when less than 15% by weight of plastic resin is added, it is difficult to improve the hard properties of the epoxy resin, and when it is added in excess of 20% by weight, it is difficult to ensure adhesion.

(2) additive

As an additive of this invention, it is based on 10-15 weight% of tackifiers, Here, 1-2 weight% of antioxidants, 0.5-1.0 weight% of stabilizers, 0.5-1.0 weight% of antifoamers, 1-2 weight% of leveling agents, Any one of 5 to 7 wt% of the reactive diluent may be used alone or in combination of two or more.

The reactive diluent is as described above, the tackifier is to impart a coping force to the crack, heat resistance and adhesion, it is preferable to use a synthetic polymer resin adhesive.

In the resin-based 100% by weight, when the tackifier is added in less than 10% by weight, the elongation rate and adhesive strength is lowered, when added to more than 15% by weight, the elongation is too large, rather the adhesive strength is lowered and manufactured at the same time There is a problem that the cost rises.

Antioxidants are intended to give the antioxidant effect of the composition during molding process, divinyl benzene, triallyl cyanurate, ethylene glycol diacrylate, diethylene glycol dimethacrylate, polyethylene glycol diketacrylate, trimethylol Propane triketacrylate and allyl methacrylate can be used alone or in combination.

The type of stabilizer is not particularly limited, but when used to improve the thermal stability of the epoxy resin, stabilizers such as benzotriazole and resorcinol may be used. In addition, it may be applied to prevent excessive decomposition of the epoxy resin during mixing and extrusion, maintaining the stability of the radicals generated. Such stabilizers are pentaerythryl-tetrakis (3- (3,5-tetrabutyl-4-hydroxyphenyl) -propionate, 4,4'-thio-bis (6-t-butyl-3-methyl Phenol), phenol, 2,4-bis (1,1-dimethylethyl) -phosphite, or the like can be used alone or in combination.

In 100 wt% of the resin-based resin, when the total additive content is less than 10 wt%, thermal stability, anti-oxidation, and the like are not well expressed, and when it exceeds 30 wt%, it is uneconomical for efficiency.

2. Resin Curing Agent

The resin curing agent has the same structure as the primer curing agent, and its content is corresponding thereto.

Hereinafter will be described in detail through an experimental example of the composite waterproof construction method and a composite waterproof layer structure formed thereby according to the present invention.

In the experimental example of the present invention, the adhesiveness (wet side and dry side) of each waterproof layer, concrete and neutralization reaction, waterproof performance, waterproof performance maintenance, UV aging, salt resistance, chemical resistance (alkali and acid resistance) were evaluated , The evaluation method is as follows.

(Adhesiveness)

A waterproof layer is formed on the concrete surface of the wet and dry surfaces, respectively, and some samples of the concrete-waterproof layer are taken, irradiated with ultraviolet rays for 5 days in the drying rack, and there is a peeling or air pocket phenomenon due to poor adhesion. It was examined.

When the adhesiveness was maintained for 3 days or more, it was good when the above characteristics were maintained for 2 days or more, and when the above characteristics were maintained for 1 to 2 days, in general, defects occurred within 1 day were regarded as defective.

(Keep waterproof performance)

After performing the same experiment as the adhesion test, the evaluation of the waterproof performance was evaluated through whether cracks in the waterproof layer after 5 days.

(Concrete and neutralization reaction)

The concrete-water-proof layer sample used in the adhesion evaluation was immersed in a bath containing water, and irradiated with ultraviolet rays for 5 days, and then examined for peeling phenomenon.

(UV aging)

After performing the same experiment as the adhesion test, UV aging evaluation was performed through the surface discoloration after 5 days. One hour in the environment was counted as one month.

(Salting resistance)

Each waterproof layer was immersed in a 10% salt solution at 500C for 500 hours, and then examined for appearance swelling and surface color change.

(Chemical resistance)

Each waterproof layer was deposited on 10% sulfuric acid and 10% hydrochloric acid solution to measure acid resistance and 10% caustic soda solution to measure alkali resistance. .

In the chemical resistance and salt resistance evaluation, 1 hour under the environment was calculated as 1 month, and excellent adhesion was maintained for 7 years or more, good for 5 years or more, good for 3 years or more, and poor for less than 3 years. It was.

Experimental Example 1

In order to test the adhesion and other physical properties of the primer layer 10, the primer was applied using a roller in an amount of 0.40 kg / m ² , respectively, and the primer materials were Experimental Examples 1-1 to 1-5, respectively. Dry solvent-free epoxy (Seoil Fine Chemical, sc-602), wet solvent-free epoxy (Seoil Fine Chemical, sc-603), dry solvent epoxy, polyurethane (curable, p-100), aqueous acrylic resin (joint polymer, 234) As a result, the experiments were conducted on the external aging, salt resistance, alkali resistance and acid resistance formed by the respective experimental examples. The experimental results are shown in Table 1.

Table 1

As shown in Table 1, the wet epoxy primer showed better adhesion or performance than the wet surface, while the wet epoxy primer showed superior characteristics in other properties.

Experimental Example 2

Next, in order to examine the performance of the chemical-resistant waterproof layer 100 using the first epoxy resin layer 20 and the second epoxy resin layer 40, three times the tar epoxy resin as Experimental Examples 2-1 to 2-5, respectively. 2 to 10 mm / m ² thickness using coating method, acrylic elastic mortar method, carbon, glass fiber reinforcement method, resin panel reinforcement method and acid-resistant soft epoxy resin-glass fiber method (FRP method) according to the present invention. By constructing the waterproof layer, we examined the wet surface adhesion, crack incidence, concrete and neutralization reaction, elongation, workability, maintenance of waterproof performance, chemical resistance, and aging against UV rays. The experimental results and experimental materials are summarized in <Table 2>.

TABLE 2

As shown in Table 2, when the epoxy FRP method according to the present invention is used, it exhibits good overall characteristics, and in particular, it has excellent chemical resistance and wet surface bonding.

Maintaining waterproof performance should be maintained for more than 7 years. Hard epoxy products are inflexible and cracked, but oily epoxy has no elongation and cracks. And because of the glass fiber reinforced method there was no crack generation rate. Epoxy resin has excellent adhesion and waterproof performance, so it can be seen that it is a semi-permanent repair reinforcement method if it does not cause cracks.

In addition, the present invention is a method of lamination reinforcement by impregnating glass fiber in the acid-resistant wet soft epoxy paint, it is excellent in wet surface adhesiveness and durability, water resistance, weather resistance, chemical resistance, the occurrence rate of defects occur within 1% finely. However, since there may be a defect caused by a worker's work mistake, it is the most suitable method if only thorough work training is executed. Since only the defective part needs to be cut out and reinforced, the maintenance cost is low and the maintenance work is easy, so anyone can work. This is because the chemically-resistant waterproof layer formed by the present invention has excellent adhesion to wet surfaces, softness, and solvents are not mixed, so there are no hallucinations and defects do not occur even when working properly. Because it is.

In addition, the acrylic resin is reduced to acrylic acid when the polymerization ring is released, but neutralization reaction with concrete alkali occurs. However, epoxy resin becomes thermosetting plastic when the main chemical and the curing agent are chemically reacted, so that the acrylic resin is melted or trait like acrylic plastic resin. It does not change. Therefore, it is toxic before curing, but after curing, the toxicity disappears, and thus weak alkalinity has the advantage that no chemical reaction occurs with concrete.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

Claims

In the chemical resistance construction method of underground structures,

Pretreatment step of pretreatment by removing foreign matter on the surface of the concrete structure;

Primer layer coating step of coating a wet epoxy primer layer on the surface of the concrete structure;

A resin layer coating step of laminating and coating a first epoxy resin layer made of a soft epoxy resin on the wet epoxy primer layer;

A reinforcing step of laminating a glass fiber layer on the first epoxy resin layer;

Impregnating a second epoxy resin layer made of a soft epoxy resin on the glass fiber layer to impregnate the glass fiber layer between the first epoxy resin layer and the second epoxy resin layer;

And a surface treatment step of finishing the surface treatment of the second epoxy resin layer.

The primer composition constituting the wet epoxy primer layer comprises a primer base and a primer curing agent,

100% by weight of the primer motif,

50 to 70% by weight of polyfunctional epoxy resin, bisphenol A type epoxy resin alone or mixed with bisphenol F type epoxy resin, 15 to 30% by weight of noblock epoxy resin, 10 to 20% by weight of reactive diluent, 3 to 4% of permeability imparting agent Including%

100% by weight of the primer curing agent, made of 30 to 40% by weight of modified aliphatic amine, 60 to 70% by weight of modified aromatic amine,

The chemical composition of the underground structure, characterized in that the mixing ratio of the primer base material and the primer curing agent is 2: 1 to 3: 1.
The method of claim 1,

The soft epoxy resin composition forming the first epoxy resin layer and the second epoxy resin layer comprises a resin main material and a resin curing agent,

100% by weight of the resin motif,

30 to 40% by weight of polyfunctional epoxy resin alone, or mixed with bisphenol F type epoxy resin, 20 to 30% by weight of noblock epoxy resin, 15 to 20% by weight of plastic resin, and 10 to 30% by weight of additive Including,

100% by weight of the resin curing agent,

It comprises 25 to 35% by weight of modified aliphatic amine, 65 to 75% by weight of modified aromatic amine,

The chemical composition of the underground structure, characterized in that the mixing ratio of the primer base material and the primer curing agent is 2: 1 to 3: 1.
The method of claim 2,

The plastic resin is a chemical resistance construction method of the underground structure, characterized in that at least one of urethane resin, acrylic resin, rubber resin, petroleum resin, fatty acid resin.
The method of claim 2,

The additive is 10 to 15% by weight of a tackifier;

Underground structure, characterized by mixing at least one of 1 to 2% by weight antioxidant, 0.5 to 1.0% by weight stabilizer, 0.5 to 1.0% by weight antifoam, 1 to 2% by weight leveling agent, 5 to 7% by weight reactive diluent Chemical resistance construction method
The method according to claim 1 or 4,

The reactive diluent chemically resistant construction method of the underground structure, characterized in that consisting of aliphatic difunctional epoxy resin.
The method of claim 1,

The tensile strength of the glass fiber layer is a chemical resistance construction method of the underground structure, characterized in that the weft and the inclination is 50kg, 25.4mm or more, respectively.
The method of claim 1,

The pretreatment step may include a front treatment step of surface treatment of the concave-convex surface after surface treatment of the surface of the concrete structure at high pressure;

An antirust step of performing an antirust treatment on the rebar exposed from the concrete structure;

If there is a crack on the surface of the concrete structure, chemical resistance construction method of the underground structure, characterized in that it comprises a putty step of filling a wet epoxy resin in the crack portion.
The method of claim 1,

Chemical resistance construction method of the underground structure,

After the impregnation step further comprises a top coating step of laminating a third epoxy resin layer made of a soft epoxy resin on the second epoxy layer,

The surface treatment step is a chemical resistance construction method of the underground structure, characterized in that the surface finish to finish the third epoxy resin layer.