KR102535681B1 - Reinforcing polymer mortar composition and concrete repair method using crimp wire mesh - Google Patents

Abstract

The reinforcing polymer mortar composition according to the present invention includes 35 to 45 parts by weight of a cement binder including at least one of Portland cement, alumina cement, and blast furnace slag powder, 0.1 to 10 parts by weight of a polymer resin, and 30 to 50 parts by weight of silicon oxide. , 1 to 10 parts by weight of silica fume and 0.1 to 10 parts by weight of a fiber reinforcing material including at least one of polypropylene fibers and sepiolite fibers.
The concrete repair method using the reinforcing polymer mortar composition and the crimp wire mesh according to the present invention includes a pretreatment step of chipping and cleaning the target surface of the concrete structure; A wire mesh installation step of installing a crimp wire mesh on the cleaned target surface; and a repair step of forming a repair layer by pouring the polymer mortar composition of any one of claims 1 to 6 while filling the space between the crimp wire mesh and the target surface.

Description

Reinforcing polymer mortar composition and concrete repair method using crimp wire mesh

The present invention relates to a reinforcing polymer mortar composition and a concrete repair method using the same and a crimp wire mesh. In more detail, the crimp wire mesh can improve durability, watertightness and strength and suppress cracks by including a fiber reinforcing material. It relates to a polymer mortar composition for reinforcement with improved workability and stability by utilizing and a concrete repair method using this crimp wire mesh.

In a reinforced concrete structure, internal reinforcing bars are corroded due to chemical corrosive environment, salt damage and neutralization, moisture penetration, etc., and corrosion of reinforcing bars leads to expansion of the reinforcing bars, eventually deteriorating the concrete structure, resulting in long-term durability and deterioration in usability.

Since such deterioration of the structure continues to lead to the risk of collapse of the structure, repair methods such as cross-section restoration and surface protection are continuously used to improve the durability of concrete structures.

In other words, delamination, initial defects, or cracks on the surface of a concrete structure facilitate the movement of deterioration factors and accelerate the progress of deterioration. Therefore, in order to secure the stability and performance of reinforced concrete structures, repairs should be carried out at the early stage of deterioration to prevent further deterioration. It is necessary to suppress the progress of deterioration and restore and improve durability performance.

Therefore, after removing the concrete part containing deterioration factors such as deterioration of concrete, corrosion of steel, and other causes, such as delamination or delamination of the cross section of the structure, filling the cross section restoration material to restore the cross section to its original performance and shape Carry out repairs by spraying or spraying.

As a prior art for this, Korean Patent Registration No. 10-1164623 (July 4, 2012) discloses a polymer mortar composition for preventing deterioration of concrete structures and repairing cross sections, including 100 parts by weight of cement and 80 to 110 silica sand. A polymer mortar composition for preventing deterioration and repairing a cross section of a concrete structure is known, comprising 15 to 40 parts by weight of slag, 5 to 12 parts by weight of garnet, and 0.6 to 4.0 parts by weight of an admixture.

However, concrete also cracks due to drying shrinkage, temperature change, etc., and neutralization of concrete is promoted at cracks and surfaces of these structures, and at the same time, deterioration occurs in the concrete part of the structure in a complex way, causing the surface of the structure to peel off or peel off. Since there is a problem of showing the phenomenon of, therefore, defects in reinforced concrete structures must be repaired or reinforced, and the mortar used for this must be able to be practically combined with the existing concrete structure when supplemented and placed on the surface or cross section of the existing structure, In the case of the above prior literature, the adhesive strength is expressed during initial restoration and repair work, but there was a problem in that repair work had to be performed again shortly after construction.

Therefore, in order to solve the above problems, there is a need to develop a mortar composition capable of effectively repairing and reinforcing the durability of a concrete structure and a repair method using the same.

Korean Patent Registration No. 10-1164623

The main object of the present invention is to provide a polymer mortar composition for reinforcement capable of improving durability, watertightness, strength, workability, and stability of concrete repair and a concrete repair method using the crimp wire mesh.

Another object of the present invention is to improve the heat resistance of a mortar composition.

Another object of the present invention is to improve the durability of the repair layer through acidity control.

In order to achieve the above object, the reinforcing polymer mortar composition according to the present invention includes 35 to 45 parts by weight of a cement binder containing at least one of Portland cement, alumina cement, and blast furnace slag powder, 0.1 to 10 parts by weight of a polymer resin, 30 to 50 parts by weight of silicon oxide, 1 to 10 parts by weight of silica fume, and 0.1 to 10 parts by weight of a fiber reinforcing material including at least one of polypropylene fibers and sepiolite fibers.

Furthermore, the concrete repair method using the reinforcing polymer mortar composition and the crimp wire mesh according to the present invention includes a pretreatment step of chipping and cleaning the target surface of the concrete structure; A wire mesh installation step of installing a crimp wire mesh on the cleaned target surface; and a repair step of forming a repair layer by pouring the polymer mortar composition of any one of claims 1 to 6 while filling the space between the crimp wire mesh and the target surface.

In addition, the composition is characterized in that it further comprises 1 to 10 parts by weight of a heat-resistant reinforcing agent containing polybenzoxazine.

In addition, the heat resistance reinforcing agent, 40 to 50 parts by weight of acetaldehyde, 30 to 40 parts by weight of aniline, and 20 to 30 parts by weight of bisphenol A (BPA) at 100 to 130 ° C. for 30 to 60 minutes Preparing a polybenzoxazine by mixing during; 40 to 50 parts by weight of the polybenzoxazine, 30 to 50 parts by weight of ethyl ether, and 20 to 30 parts by weight of an acidity regulator including silica, aluminum hydroxide and lithium acetate It is characterized in that it is prepared through; mixing the parts and drying under low pressure at 70 to 90 ° C. and 0.01 to 0.05 bar for 3 to 5 hours to complete the heat-resistant reinforcing agent.

According to the polymer mortar composition for reinforcement and the concrete repair method using the crimp wire mesh according to the present invention,

1) Provide a polymer mortar composition capable of suppressing cracking, which can be expected to improve workability and pumpability, and further improve waterproofness and moisture permeability, as well as increase flexural strength and adhesive strength,

2) The target surface of the concrete structure is reinforced using a crimped wire mesh, and the mortar composition is filled to effectively repair and reinforce the durability of the concrete structure.

3) Heat resistance and flame retardance can be added by adding a heat resistant reinforcing agent to the polymer mortar composition,

4) The durability of the repair layer can be improved by creating a more suitable environment for construction by adding acidity regulators.

1 is a conceptual diagram showing a cross section after the repair method of the present invention has been completed.
Figure 2 is a flow chart of the repair method of the present invention.
Figure 3 is a flow chart showing the step of manufacturing a heat-resistant reinforcing agent of the present invention.
Figure 4 is a flow chart showing the acidity regulator manufacturing steps of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are not drawn to scale, and like reference numbers in each drawing indicate like elements.

The reinforcing polymer mortar composition of the present invention preferably contains 35 to 45 parts by weight of cement binder, 0.1 to 10 parts by weight of polymer resin, 30 to 50 parts by weight of silicon oxide, 1 to 10 parts by weight of silica fume, and 0.1 part by weight of fiber reinforcing material. to 10 parts by weight.

The cement binder includes at least one of Portland cement, alumina cement, and blast furnace slag powder, and more preferably includes Portland cement, alumina cement, and blast furnace slag powder. The cement binder including Portland cement, alumina cement, and blast furnace slag powder is used for bonding the above-described mortar composition to each other and bonding to concrete. is weak, and when mixed more than the upper limit, there is no significant change in bonding strength.

Portland cement performs the function of forming the basic specifications of the mortar composition, and the curing time can be shortened by accelerating the curing time by adding alumina cement, and the stability of the mortar composition is increased and the long-term strength is improved by adding blast furnace slag powder. can

The polymer resin may preferably include at least one of a latex resin, an acrylic resin, a polyvinyl alcohol resin, and an ethylene vinyl acetic resin, and the effect of increasing the adhesive strength and flexural strength of the mortar composition according to the addition of the polymer resin can be expected Furthermore, by increasing the fluidity of concrete, there is an effect of improving workability and increasing the expressed strength due to a decrease in unit quantity, and by forming a film film with self-attachment and adsorption during cement hydration reaction, hydrate and pore structure are improved to increase watertightness to reduce chloride It suppresses the penetration of water and has the effect of improving resistance such as frost damage and neutralization and controlling micro cracks.

The fiber reinforcing material is characterized in that it includes at least one of polypropylene fiber and sepiolite fiber. The addition of such a fiber reinforcing material can increase flexural strength as well as reduce dry cracks that may occur during initial curing. . In addition, sepiolite fibers function as an inorganic thickener and generate hydrate crystals during cement hydration to improve durability, watertightness and strength of concrete and to suppress cracking.

Silicon oxide is also called silica sand, and when added to the mortar composition, it has an effect of improving heat insulating properties and preventing cracks and condensation of the mortar composition.

Silica fume is an industrial by-product from electric arc furnaces used in the manufacturing process of silicon metal or silicon alloy. It is a pozzolanic material containing more than 80% of amorphous silica, and its particle size is about 1/25 of that of cement particles. The micro-filler effect of filling the pores of cement particles with spherical particles and reducing the friction between aggregate particles, mortar, pump and transportation hose, thereby increasing workability and pumpability, improving the adhesiveness of mortar and resistance to material separation and plays a role in reducing bleeding.

In addition, the pozzolanic reaction [3Ca(OH)2 + 2SiO2 → 3CaO·2SiO2·3H2O] reacts with Ca(OH)2 generated during the cement hydration reaction to form additional CSH gel, resulting in improved strength and improved resistance to free water. It forms a dense structure by filling the gaps formed by it, reducing air permeability and water permeability, and reducing heat of hydration.

Furthermore, the polymer mortar composition of the present invention may further include 1 to 10 parts by weight of additives including cellulose and sodium gluconate. In this case, the polymer mortar composition includes 35 to 45 parts by weight of cement binder, 0.1 to 10 parts by weight of polymer resin, 30 to 50 parts by weight of silicon oxide, 1 to 10 parts by weight of silica fume, and 0.1 to 10 parts by weight of fiber reinforcing material, It may contain 1 to 10 parts by weight of additives.

Here, cellulose and sodium gluconate are materials that can act as a thickener to increase viscosity when mixed with water, and can increase fluidity by increasing viscosity as well as increase durability, thereby increasing the fluidity of the polymer mortar composition. Of course, it is possible to improve the durability of the repair layer 30 formed while the mortar composition is cured and cured.

The polymer mortar composition for reinforcement of the present invention as described above can be used for repair and reinforcement of concrete structures by mixing with water, and 80 to 90 parts by weight of the polymer mortar composition of the present invention and 10 to 20 parts by weight of water are mixed to repair and can be used for reinforcement.

According to the mortar composition of the present invention, not only the flexural strength and adhesive strength can be increased, but also improvement in workability and pumpability, and further improvement in waterproofness and moisture permeability can be expected, and the effect of suppressing cracking can be provided. .

The concrete repair method using the reinforcing polymer mortar composition and the crimp wire mesh 20 of the present invention will be described as follows.

1 is a conceptual diagram showing a cross section where the repair method of the present invention is completed, and FIG. 2 is a flow chart of the repair method of the present invention.

1 and 2, the concrete repair method using the reinforcing polymer mortar composition and the crimp wire mesh 20 includes a pretreatment step (S1), a wire mesh installation step (S2), and a repair step (S3). to be characterized

The pretreatment step (S1) is a step of chipping and cleaning the target surface 10 of the deteriorated concrete structure, by removing foreign substances and gaps of the target surface 10, which is the deteriorated area of the concrete structure, and increasing the area, This is done to improve the adhesion of the mortar composition. Here, chipping means roughening the target surface 10 of the concrete structure, and cleaning means removing foreign substances from the target surface 10 to make the target surface 10 clean. Chipping and cleaning can be performed in various ways without particular limitation as long as they can be performed in the field to which this technology belongs.

Furthermore, the target surface 10 herein refers to the target surface 10 on which the repair method is to be performed, in other words, it may be a surface that has deteriorated or requires repair. It can be all or part of the concrete structure surface.

The next wire mesh installation step (S2) is a process of installing the crimp wire mesh 20 on the target surface 10 of the concrete structure where the pretreatment step is performed and the cleaning is completed. Here, the crimp wire mesh 20 refers to a conventionally sold crimp stainless steel wire mesh, and at this time, there is no restriction on the thickness of the wire forming the wire mesh or the hole size of the wire mesh.

Furthermore, the crimp wire mesh 20 may be installed on the entire structure target surface 10 or may be installed only on a part of the structure target surface 10 . One side of the wire mesh may be fastened and fixed to the target surface 10 of the structure through bolts, and the crimped wire mesh 20 is fixed to the target surface 10 to the structure using a conventional taka or the like. It is also possible to do In addition, the method of fixing and installing the crimp wire mesh 20 on the target surface 10 of the structure is not limited. In addition, the crimp wire mesh 20 may be tightly fixed to the upper surface of the target surface 10, but as shown in the drawing, it is possible to be fixed at a partial distance from the surface of the target surface 10. That is, when the target surface 10 is a flat plane, the crimp wire mesh 20 may be tightly fixed to the upper surface of the target surface 10, but when the target surface 10 is curved as shown in FIG. 1, the target surface ( The crimp wire mesh 20 may be fastened and fixed to at least one side of the upper surface of 10).

In this case, the crimp wire mesh 20 may also be referred to as a steel mesh having a mesh structure, and a mesh made of a conventional metal material may be the crimp wire mesh 20. Here, no particular limitation is placed on the mesh size of the crimp wire mesh 20, that is, the mesh diameter.

As the crimp wire mesh 20 is fixedly installed on the target surface 10 of the concrete structure, the chipping effect on the target surface 10 is strengthened to strengthen the adhesion between the polymer mortar and the concrete structure, and at the same time, defects due to lifting phenomenon It can minimize the occurrence, increase the reinforcement of the structure, and increase the load capacity.

Finally, after mixing the polymer mortar composition of the present invention with water through the repair step (S3), concrete including the upper surface of the crimp wire mesh 20 while filling the space between the crimp wire mesh 20 and the target surface 10 It is cast on the target surface 10 of the structure to form the repair layer 30.

Here, since the crimp wire mesh 20 has a perforated mesh structure, the polymer mortar composition is filled not only on the upper surface of the crimp wire mesh 20 but also in the space between the crimp wire mesh 20 and the concrete structure, and thus the polymer mortar composition is applied to the mesh of the wire mesh. The mortar composition may enter between the crimp wire mesh 20 and the target surface 10 and be laminated on the upper surface of the crimp wire mesh 20 at the same time. That is, the repair layer 30 may be attached to the target surface 10 of the concrete structure by filling the inner space via the mesh of the crimp wire mesh 20. Therefore, the space between the crimp wire mesh 20 and the target surface 10 is filled through the repair layer 30, and the repair layer 30 may also be placed on the upper surface of the crimp wire mesh 20.

That is, in this case, as can be seen in FIG. 1, it can represent a shape as if the crimp wire mesh 20 is sandwiched between the repair layers 30 along the height direction, and in the case of this crimp wire mesh 20, the target surface 10 of the concrete structure Since it is fastened and fixed to the repair layer 30, the crimp wire mesh 20, and the binding force between the concrete structure is increased, it is possible to minimize the occurrence of defects due to lifting and further strengthen the adhesion of the repair layer 30.

According to the concrete repair method of the present invention, the target surface 10 of the concrete structure is reinforced using the crimp wire mesh 20, and the mortar composition is filled and applied to effectively repair and reinforce the durability of the concrete structure. .

Furthermore, between the pretreatment step (S1) and the wire mesh installation step (S2), it is possible to further include a rust prevention step of removing rust from the cleaned target surface 10 and performing a rust prevention treatment.

In the anti-rust step, rust on the target surface 10 is removed using a corrosion remover or rust remover, and a conventional anti-rust agent is applied to perform anti-rust treatment. Here, no particular limitation is placed on the type or composition of the rust remover or rust inhibitor.

Therefore, by removing corrosion or rust from the target surface 10 through this anti-rust step and performing anti-rust treatment, the rust prevents the adhesion of the repair layer 30 from being inhibited and at the same time prevents the propagation of corrosion or rust, and additional corrosion. Of course, it is possible to prevent rust formation.

Furthermore, after the repair step (S3), a waterproof step of forming the waterproof layer 40 by applying a waterproof paint containing ethylene vinyl acetate (EVA) to the upper surface of the repair layer 30 may be further included.

Here, since the waterproof paint contains ethylene vinyl acetate, which has excellent adhesion and waterproofness as an active ingredient, while having a high level of adhesion, the surface can be waterproofed, so as the waterproof layer 40 is formed on the upper surface of the repair layer 30, The waterproofness of the repair layer 30 formed through the repair method of the present invention can be increased.

Furthermore, when the concrete structure subjected to the repair method of the present invention is a structure installed outdoors, neutralization of the concrete may proceed as the concrete loses its alkalinity and changes to calcium carbonate due to acid rain. Accordingly, corrosion of reinforcing bars and steel materials embedded in concrete may occur, resulting in deterioration in performance of the structure, cracks, collapse, deterioration, and the like, and very dangerous situations such as human casualties may result.

Therefore, it is possible to prevent neutralization of concrete according to the application of waterproof paint and the formation of the waterproof layer 40, thereby preventing performance degradation, cracking, collapse, and deterioration of the concrete structure in which the repair method of the present invention is performed once more. am.

Furthermore, the mortar composition of the present invention may further include 1 to 10 parts by weight of a heat-resistant reinforcing agent including polybenzoxazine. In this case, the polymer mortar composition includes 35 to 45 parts by weight of cement binder, 0.1 to 10 parts by weight of polymer resin, 30 to 50 parts by weight of silicon oxide, 1 to 10 parts by weight of silica fume, 0.1 to 10 parts by weight of fiber reinforcing material, and It may contain 1 to 10 parts by weight of a heat resistant reinforcing agent.

Polybenzoxazine was developed as a new type of phenolic resin, in which the phenolic units are linked by a Mannich-based bridge -CH2-N(R)-CH2- instead of the methylene (-CH2-) bridge associated with traditional phenolic products. It is known that the monomers of polybenzoxazine can be easily prepared from phenol, primary amine, and formaldehyde, and these polybenzoxazines are characterized by excellent heat resistance and flame retardance, and thus heat resistance and flame retardation. It can play a role in adding gender.

In this case, the heat-resistant reinforcing agent of the present invention may further include an additional composition in addition to the above-described polybenzoxazine.

Figure 3 is a flow chart showing the manufacturing step of the heat-resistant reinforcing agent of the present invention.

Referring to FIG. 3, the heat-resistant reinforcing agent of the present invention may be prepared through the steps of preparing a polybenzoxazine (S21) and completing the heat-resistant reinforcing agent (S22).

(S21) preparing polybenzoxazine

First, 40 to 50 parts by weight of acetaldehyde, 30 to 40 parts by weight of aniline, and 20 to 30 parts by weight of bisphenol A (BPA) were mixed at 100 to 130 ° C. for 30 to 60 minutes to obtain polybenzo oxazine is produced.

Preferably, the polybenzoxazine of the present invention is an aniline-based material, and may be formed by reacting an amine group (-NH2) of aniline with a hydroxyl group (*?*OH) of bisphenol A.

In other words, aniline provides a ring structure containing nitrogen and oxygen on both sides of the benzene ring, and bisphenol A provides a structure in which two benzene rings are attached to carbon number 2 of propane.

Acetaldehyde is added as a solvent in the step of preparing polybenzoxazine, and also serves as a catalyst capable of controlling the rate of reaction between the amine group and the hydroxyl group described above.

(S22) Step of completing the heat-resistant reinforcing agent

Next, an acidity regulator comprising 40 to 50 parts by weight of the prepared polybenzoxazine and 30 to 50 parts by weight of ethyl ether, silica, aluminum hydroxide, and lithium acetate 20 to 30 parts by weight are mixed and then dried under low pressure at 70 to 90° C. and 0.01 to 0.05 bar for 3 to 5 hours to complete a heat-resistant reinforcing agent.

Ethyl ether is a solvent for dissolving and evenly dispersing the above-described polybenzoxazine, and the low-pressure dried heat-resistant reinforcing agent can be obtained in the form of a powder from which residual solvents and components are removed.

The acidity regulator is added to prevent performance degradation of the mortar composition due to acidity change by lowering the acidity of the heat-resistant reinforcing agent, and may include silica, aluminum hydroxide, and lithium acetate as active ingredients, through which the heat-resistant reinforcing agent At the same time as lowering the acidity of the water retention layer 30, it is possible to increase the neutralization prevention function.

The heat-resistant reinforcing agent prepared through this process is added to the mortar composition of the present invention to serve to add heat resistance, and as the repair layer 30 in which the mortar composition of the present invention is cured is heated by solar heat, etc. In (10), it is possible to assist in preventing peeling or falling, and it is also possible to prevent loss of the function of the coating film. Furthermore, as the thermal stability of the mortar composition is further improved, it is of course possible to help workers secure the convenience of construction.

In addition, the acidity regulator of the present invention can lower the acidity of the heat-resistant reinforcing agent to prevent a rapid change in acidity of the surface on which construction is performed. That is, workability is further improved by assisting the above-described heat-resistant reinforcing agent, and the mortar composition of the present invention can be applied even in places where acidity is important, such as concrete where alkalinity must be maintained, thereby ensuring stability and increasing universality. , can enhance the anti-neutralization effect.

Further preferably, the acidity regulator of the present invention may further include an additional composition in addition to the above-described silica, aluminum hydroxide, and lithium acetate. The steps for preparing the acidity regulator are described in detail as follows.

Figure 4 is a sequence showing the acidity regulator manufacturing steps of the present invention.

Referring to FIG. 4 , the acidity regulator described above may be prepared through the steps of preparing mullite (S31), preparing an intermediate material (S32), and completing the acidity regulator (S33).

(S31) Step of manufacturing mullite

First, 40 to 50 parts by weight of silica, 40 to 50 parts by weight of aluminum hydroxide, and 5 to 15 parts by weight of aluminum fluoride are heated at 900 to 1200 ° C. for 1 to 3 hours, and then pulverized. Produces Mullite.

Silica and aluminum hydroxide are substances that form mullite by forming a covalent bond, and aluminum fluoride can play a role in controlling the rate of forming a covalent bond.

It is possible that an alkali metal having a low density is adsorbed to mullite prepared in this way.

(S32) preparing an intermediate material

Next, 30 to 40 parts by weight of the prepared mullite, 30 to 40 parts by weight of lithium acetate, and 30 to 40 parts by weight of purified water are mixed at 50 to 70 ° C. for 3 to 5 hours to prepare an intermediate material .

Lithium acetate serves to provide lithium to the acidity regulator and at the same time can prevent the acidity regulator of the present invention from being too alkaline. As lithium ions are ionized from lithium acetate, they can be adsorbed on mullite, and at this time, lithium ions are adsorbed in the form of lithium hydroxide containing a hydroxyl group to provide a function of alkalizing acidified sites.

(S33) Step of completing the acidity regulator

Finally, 80 to 90 parts by weight of the intermediate material and 10 to 20 parts by weight of ethanol are pressurized at 700 to 1000 ° C. and 500 to 800 bar to complete the acidity regulator.

Ethanol is a highly volatile substance and can serve to remove impurities or unreacted substances contained in the acidity regulator of the present invention. In addition, by going through the pressurization step, unnecessary substances other than the active ingredient of the acidity regulator can be prevented from remaining.

According to the acidity regulator of the present invention, durability of the repair layer 30 can be improved by creating a more suitable environment for construction, as well as operator's convenience and safety can be further increased. Furthermore, since the waterproofing method of the present invention can be performed even in environmental conditions vulnerable to acidity change, the application range is expanded and the workability is further improved.

Hereinafter, evaluation results of Examples and Comparative Examples will be compared and described in order to explain the physical properties according to the composition of the mortar composition of the present invention. The examples consist of preferred Examples 1 to 3 of the mortar composition containing the heat-resistant reinforcing agent of the present invention, and the comparative examples are mortar compositions not containing the heat-resistant reinforcing agent of the present invention.

<Example 1>

45 g of acetaldehyde, 35 g of aniline, and 20 g of bisphenol A were mixed at 120° C. for 50 minutes to prepare 100 g of polybenzoxazine as a heat-resistant reinforcing agent.

40 g of cement binder including 60 wt % of Portland cement, 30 wt % of alumina cement, and 10 wt % of blast furnace slag powder, 5 g of latex resin, 35 g of silicon oxide, 5 g of silica fume, 5 g of polypropylene fiber, and 10 g of heat-resistant reinforcing agent were mixed to form a mortar. A composition was prepared.

<Example 2>

100 g of an acidity regulator was prepared by mixing 25 g of silica, 25 g of aluminum hydroxide, and 50 g of lithium acetate.

100 g of polybenzoxazine was prepared by mixing 45 g of acetaldehyde, 35 g of aniline, and 20 g of bisphenol A at 120° C. for 50 minutes.

40 g of polybenzoxazine, 40 g of ethyl ether, and 20 g of the prepared acidity regulator were mixed and dried under low pressure at 80° C. and 0.03 bar for 4 hours to prepare 100 g of heat-resistant reinforcing agent.

40 g of cement binder including 60 wt % of Portland cement, 30 wt % of alumina cement, and 10 wt % of blast furnace slag powder, 5 g of latex resin, 35 g of silicon oxide, 5 g of silica fume, 5 g of polypropylene fiber, and 10 g of heat-resistant reinforcing agent were mixed to form a mortar. A composition was prepared.

<Example 3>

45 g of silica, 45 g of aluminum hydroxide, and 10 g of aluminum fluoride were heated at 1000° C. for 2 hours and then pulverized to prepare 100 g of mullite.

35 g of mullite, 35 g of lithium acetate, and 30 g of purified water were mixed at 60° C. for 4 hours to prepare 100 g of an intermediate material.

85 g of the intermediate material and 15 g of ethanol were pressurized at 800° C. and 700 bar to prepare 100 g of an acidity regulator.

100 g of polybenzoxazine was prepared by mixing 45 g of acetaldehyde, 35 g of aniline, and 20 g of bisphenol A at 120° C. for 50 minutes.

40 g of polybenzoxazine, 40 g of ethyl ether, and 20 g of the prepared acidity regulator were mixed and dried under low pressure at 80° C. and 0.03 bar for 4 hours to prepare 100 g of heat-resistant reinforcing agent.

40 g of cement binder including 60 wt % of Portland cement, 30 wt % of alumina cement, and 10 wt % of blast furnace slag powder, 5 g of latex resin, 35 g of silicon oxide, 5 g of silica fume, 5 g of polypropylene fiber, and 10 g of heat-resistant reinforcing agent were mixed to form a mortar. A composition was prepared.

<Comparative Example 1>

40 g of cement binder including 60 wt % of Portland cement, 30 wt % of alumina cement, and 10 wt % of blast furnace slag powder, 5 g of latex resin, 35 g of silicon oxide, 5 g of silica fume, 5 g of polypropylene fiber, and 10 g of heat-resistant reinforcing agent were mixed to form a mortar. A composition was prepared.

100 g of polybenzoxazine was prepared by mixing 45 g of acetaldehyde, 35 g of aniline, and 20 g of bisphenol A at 120° C. for 50 minutes.

40 g of polybenzoxazine, 40 g of ethyl ether, and 20 g of the acidity regulator prepared through the process of 1. above were mixed and dried under low pressure at 80 ° C. and 0.03 bar for 4 hours to prepare 100 g of heat-resistant reinforcing agent.

40 g of a cement binder including 60 wt % of Portland cement, 30 wt % of alumina cement, and 10 wt % of blast furnace slag powder, 5 g of latex resin, 35 g of silicon oxide, 5 g of silica fume, 5 g of polypropylene fiber, and 10 g of heat-resistant reinforcing agent A mortar composition was prepared by mixing.

<Comparative Example 1>

Mortar composition by mixing 40 g of a cement binder including 60 wt % of Portland cement, 30 wt % of alumina cement, and 10 wt % of blast furnace slag powder, 5 g of latex resin, 45 g of silicon oxide, 5 g of silica fume, and 5 g of polypropylene fiber by weight was manufactured.

[Experimental Example]

Adhesion performance: In order to evaluate the adhesion performance, a standard test specimen was prepared in accordance with KS F 2761, and then the samples of Examples 1 to 3 and Comparative Example were cured under standard conditions for 14 days. Attached using Then, tensile force was applied in the vertical direction using an adhesive strength tester, and then the maximum tensile force was measured to evaluate the adhesive performance.

2. Evaluation of flame resistance performance: In accordance with KS F 4930, Examples 1 to 3 and Comparative Example were applied and cured under standard conditions for 14 days, followed by pretreatment, and then immersed in 5% sodium chloride aqueous solution for 7 days. Mass change before and after immersion The flame resistance performance was evaluated through.

3. Evaluation of water permeability resistance: In order to evaluate water permeability performance, in accordance with KS F 4930 and KS F 4919, examples 1 to 3 and comparative examples were cured under standard conditions for 14 days, followed by pretreatment, and then KS F 2451 Water permeability was evaluated by applying a water pressure of 1 bar for 1 hour using a water permeability test apparatus in accordance with the same.

4. Heat resistance evaluation: In order to evaluate the heat resistance performance, Examples 1 to 3 and Comparative Examples were cured in standard conditions for 14 days and then heated at 500 ° C for 60 minutes, respectively, and then the compressive strength was measured and compared with the compressive strength before heating Thus, the absolute value of the rate of change was observed.

Table 1 is a table showing the test results. Bond strength (MPa) Mass loss rate (%) pitching ratio Compressive strength change rate (%) Example 1 1.64 0.25 0.05 12 Example 2 1.68 0.23 0.05 10 Example 3 1.87 0.18 0.04 9 comparative example 1.04 0.42 0.09 30

As shown in Table 1 above, Examples 1 to 3 of the present invention and Comparative Example satisfy the adhesion strength of 1 MPa or more and the water permeability ratio of 0.1 or less, and of course can exhibit physical properties that meet the standards, as well as Example 1 In the case of 3 to 3, it can be seen that the adhesive strength rate is high, the water permeability and mass loss rate are low, and the compressive strength change rate after heating is low, so that the adhesion performance, flame resistance performance, waterproofness, and heat resistance are superior to those of the comparative examples.

Furthermore, through the comparative treatment of Examples 1 to 3, compared to Example 1 including only polybenzoxazine as a heat-resistant reinforcing agent, Examples 2 to 3 including a heat-resistant reinforcing agent of a composite composition showed excellent adhesion strength, flame resistance performance, waterproofness, and heat resistance. can confirm that

In addition, through the comparative treatment of Examples 2 to 3, it can be confirmed that Example 3, including the complex composition as an acidity regulator, has excellent stability compared to Example 2, and improved adhesion strength, flame resistance performance, waterproofness, and heat resistance.

As described above, although the configuration and operation of the batting mitt using recycled materials according to the present invention are expressed in the above description and drawings, this is only an example and the spirit of the present invention is not limited to the above description and drawings. , Of course, various changes and changes are possible within a range that does not deviate from the technical spirit of the present invention.

10: target surface 20: crimp wire mesh
30: repair layer 40: waterproof layer

Claims (9)

As a polymer mortar composition for reinforcement,
35 to 45 parts by weight of a cement binder containing at least one of Portland cement, alumina cement, and blast furnace slag powder, 0.1 to 10 parts by weight of a polymer resin, 30 to 50 parts by weight of silicon oxide, and silica fume 1 to 10 parts by weight, 0.1 to 10 parts by weight of a fiber reinforcing material containing at least one of polypropylene fibers and sepiolite fibers, and 1 to 10 parts by weight of a heat-resistant reinforcing agent containing polybenzoxazine. , a polymer mortar composition. According to claim 1,
The polymer resin,
A polymer mortar composition comprising at least one of a latex resin, an acrylic resin, a polyvinyl alcohol-based resin, and an ethylene-vinylacet-based resin. According to claim 1,
The heat resistance reinforcing agent,
40 to 50 parts by weight of acetaldehyde, 30 to 40 parts by weight of aniline, and 20 to 30 parts by weight of bisphenol A (BPA) were mixed at 100 to 130 ° C. for 30 to 60 minutes to obtain polybenzoxazine. Preparing;
40 to 50 parts by weight of the polybenzoxazine, 30 to 50 parts by weight of ethyl ether, and 20 to 30 parts by weight of an acidity regulator were mixed and dried under low pressure at 70 to 90 ° C. and 0.01 to 0.05 bar for 3 to 5 hours. It is manufactured through the step of completing the heat-resistant reinforcing agent,
The acidity regulator,
A polymer mortar composition comprising silica, aluminum hydroxide and lithium acetate. According to claim 3,
The acidity regulator,
Mullite ( Mullite);
Preparing an intermediate material by mixing 30 to 40 parts by weight of the mullite, 30 to 40 parts by weight of lithium acetate, and 30 to 40 parts by weight of purified water at 50 to 70 ° C. for 3 to 5 hours;
80 to 90 parts by weight of the intermediate material and 10 to 20 parts by weight of ethanol (Ethanol) are pressurized at 700 to 1000 ° C. and 500 to 800 bar to complete the acidity regulator; characterized in that prepared through, polymer mortar composition. A concrete repair method using the polymer mortar composition for reinforcement and the crimp wire mesh according to claim 1,
A pretreatment step of chipping and cleaning the target surface of the concrete structure;
A wire mesh installation step of installing a crimp wire mesh on an upper surface of the cleaned target surface;
A concrete repair method comprising a; repair step of forming a repair layer by pouring the polymer mortar composition while filling the space between the crimp wire mesh and the target surface. According to claim 5,
Between the pretreatment step and the wire mesh installation step,
A concrete repair method, characterized in that it includes; a rust prevention step of removing rust from the target surface and treating the rust. According to claim 6,
After the repair step,
Concrete repair method, characterized in that it comprises a; waterproofing step of forming a waterproofing layer by applying a waterproofing paint containing ethylene vinyl acetate (EVA) on the upper surface of the repairing layer. delete delete

Images