KR101608018B1 - Method of repairing and protecting surface of concrete structure - Google Patents

Abstract

The present invention relates to a method for performing a construction for repairing and protecting the surface of a deteriorated surface of a concrete structure. More specifically, according to the present invention, an initial strength can be secured in a short period of time. Therefore, the construction can be swiftly conducted. Moreover, since the present invention provides an excellent adhesion with existing structures and has no crack or foliation, at the same time having long-term strength and excellent durability, the repair and reinforcement effects can last for a long period of time. The method comprises a grinding step, a mortar application step, and an epoxy coating agent application step.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a concrete structure,

The present invention relates to a method of repairing and repairing a surface of a concrete structure, and more particularly, to a method of repairing and repairing a surface of a concrete structure having a feature that a maintenance protection effect can be maintained for a long period of time in repairing and repairing a damaged concrete structure.

Reinforced concrete structures are deteriorated in durability and usability in the long term due to deterioration of structures due to salt corrosion, neutralization, alkali aggregate reaction, chemical corrosion as well as corrosion expansion of steel due to penetration of water. As the deterioration of these structures continues, there is a risk of eventual collapse of the structures, so it is necessary to continuously manage and repair them.

In order to ensure the stability and performance of the reinforced concrete structure, it is necessary to perform repair at the beginning of the deterioration and to further improve the deterioration of the concrete structure due to detachment of the surface of the structure or occurrence of initial defects or cracks, And it is necessary to improve durability performance.

Therefore, in order to restore the section to its original performance and shape after removing the concrete part including deterioration factors such as deterioration factor of deterioration such as deterioration of concrete, corrosion of steel and other factors, It is general to carry out repair by construction.

Conventional concrete structure repair materials mainly use cement mortar or polymer cement mortar. Such conventional repair materials are used for the purpose of suppressing the deterioration of existing structures and improving the durability of the existing structures, The surface is often easily damaged again after the construction, so there is a problem that the repair work should be done frequently.

For example, Korean Patent Laid-Open Publication No. 2006-0079447 proposes a method for preparing a mortar composition by adding CSA (calcium sulfoaluminate) and a predetermined powdery binding material. However, the mortar composition prepared using the above-mentioned materials causes an increase in the unit cost of the construction due to the use of expensive Hauyene cement, and sufficient results in terms of the initial setting time and the strength were not obtained.

In addition, when the conventional repair method is applied, water and oxygen penetrate into fine gaps on the surface, so corrosion of the reinforcing bar caused by oxygen proceeds, deterioration of the concrete due to moisture occurs, Therefore, there is a problem that maintenance work should be performed frequently.

On the other hand, Korean Patent No. 10-1284602 and No. 10-1284604 disclose a method of preparing a primer by using a modified epoxy resin and an isocyanate curing agent and repairing and applying the surface of the concrete using the primer. The above-mentioned technology has an excellent effect of blocking the penetration of oxygen and moisture into the concrete surface. However, since the organic solvent is inevitably used in the process of using the epoxy resin and the isocyanate curing agent, This is not easy and needs to be improved.

The present invention has been developed in consideration of the above-described prior art circumstances, and it is an object of the present invention to provide a concrete structure for repairing a concrete structure that requires repair work, , The epoxy primer agent is prepared and used in the process of preparing the epoxy primer agent. Therefore, the epoxy primer agent having the characteristics that the effect on environment is small and the reaction is easy to be controlled by excluding the use of the organic solvent, And to provide a method of protecting it.

In order to achieve the above object,

(1) grinding a surface of a concrete structure requiring repair to trim the surface;

(3) applying the mortar to the surface of the trimmed concrete structure,

(a) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 0.05 to 0.2 parts by weight of a viscosity enhancer, 0.3 to 1.1 parts by weight of a fluidizing agent, 0.1 to 0.5 parts by weight of a curing accelerator, 0.1 to 0.4 parts by weight of a retarding agent, 2 to 7 parts by weight of a siliceous waterproofing agent, 5 to 15 parts by weight of a CSA- And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.

(b) one or more powder or liquid rubber selected from among ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;

(c) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;

(d) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component;

(e) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant; And

(f) 10 to 50 parts by weight of water, wherein the filler and the aggregate are mixed, wherein the filler and the aggregate are mixed with 5 to 50 parts by weight, 10 to 40 parts by weight of the filler and 20 to 70 parts by weight of the aggregate, Applying a mortar for use; And

(3) After the maintenance mortar is cured,

Wherein the reactive diluent comprises from 10 to 50% by weight of an epoxy resin, from 5 to 40% by weight of a polymethyl methacrylate resin, from 1 to 25% by weight of a reactive diluent, from 0.1 to 15% by weight of a flocculant, from 1 to 20% 1 to 20% by weight of a water-soluble oil, 1 to 10% by weight of an emulsifier, 5 to 20% by weight of an accelerator, and 50 to 50% by weight, based on 100 parts by weight of a main component obtained by mixing 0.05 to 20% by weight of an emulsifier and 10 to 80% Based on 100 parts by weight of the obtained aqueous solution, 5 to 50 parts by weight of a polyamide and 0.1 to 40 parts by weight of an amine compound are mixed in an amount of 5 to 50 parts by weight based on 100 parts by weight of the obtained aqueous solution, ;

The present invention provides a method of repairing a surface of a concrete structure.

In one embodiment of the present invention, in (2), the mixture of 100 parts by weight of the natural pozzolana of the lower phospoloranes of (a) and 1 to 20 parts by weight of calcium is mixed at 1000 to 1200 ° C for 0.5 to 1 hour And pulverizing the mixture so that the average particle size becomes 10 to 20 占 after baking.

In one embodiment of the present invention, the emulsifier (2) is a copolymer of polyoxyethylene and polyoxypropylene, and the accelerator is phenol.

In one embodiment of the present invention, the water-soluble oil used for preparing the aqueous hardener component (2) is a silicone oil or an acetate oil.

Also, in one embodiment of the present invention, the coating agent is applied in the range of 100 to 200 g / m ² in (3).

The features and advantages of the repair protection method of the surface of the concrete structure according to the present invention are as follows.

According to the present invention, an acrylic mixed resin is used in repairing and repairing a damaged surface of a concrete structure, and in particular, a clinker, a plaster, an alpha type hemi gypsum, a silica crumb, a fly ash, a limestone, a blast furnace slag, It has excellent physical properties such as bending strength, tensile strength and compressive strength by including the powder component including micro silica, excellent adhesion with existing structure, excellent chemical resistance and water resistance, resistance to freezing and thawing By using powder components such as siliceous waterproofing agent, CSA type expanding agent and fluidizing agent, the curing speed of the mortar can be greatly improved and the waterproof effect can be increased. In addition, the effect of improving the initial strength can be remarkably increased by including the modified latex rubber type resin component. Further, the physical properties are further enhanced by making the internal structure more dense by using the monomer component, the initiator component and the emulsifier, The strength can be secured and the working time can be drastically shortened. Also, the resistance to freezing and thawing is drastically improved, and the maintenance effect can be maintained for a long time.

In addition, by applying a coating agent capable of completely blocking water and oxygen permeation to the surface of the mortar composition, deterioration of concrete and reinforcing bars due to permeation of oxygen and moisture can be prevented from being caused, and the maintenance protection effect can be maintained for a long time.

Hereinafter, the present invention will be described in more detail.

As described above, the present invention comprises the following three steps. In other words,

(1) grinding a surface of a concrete structure requiring repair to trim the surface;

(2) applying the mortar to the surface of the trimmed concrete structure,

(a) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 0.05 to 0.2 parts by weight of a viscosity enhancer, 0.3 to 1.1 parts by weight of a fluidizing agent, 0.1 to 0.5 parts by weight of a curing accelerator, 0.1 to 0.4 parts by weight of a retarding agent, 2 to 7 parts by weight of a siliceous waterproofing agent, 5 to 15 parts by weight of a CSA- And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.

(b) one or more powder or liquid rubber selected from among ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;

(c) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;

(d) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component;

(e) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant; And

(f) 10 to 50 parts by weight of water, wherein the filler and the aggregate are mixed, wherein the filler and the aggregate are mixed with 5 to 50 parts by weight, 10 to 40 parts by weight of the filler and 20 to 70 parts by weight of the aggregate, Applying a mortar for use; And

(3) After the maintenance mortar is cured,

Wherein the reactive diluent comprises from 10 to 50% by weight of an epoxy resin, from 5 to 40% by weight of a polymethyl methacrylate resin, from 1 to 25% by weight of a reactive diluent, from 0.1 to 15% by weight of a flocculant, from 1 to 20% 1 to 20% by weight of a water-soluble oil, 1 to 10% by weight of an emulsifier, 5 to 20% by weight of an accelerator, and 50 to 50% by weight, based on 100 parts by weight of a main component obtained by mixing 0.05 to 20% by weight of an emulsifier and 10 to 80% Based on 100 parts by weight of the obtained aqueous solution, 5 to 50 parts by weight of a polyamide and 0.1 to 40 parts by weight of an amine compound are mixed in an amount of 5 to 50 parts by weight based on 100 parts by weight of the obtained aqueous solution, ;

In the following, each step will be described in detail.

1. Surface grinding of concrete structures

When cracks are generated in concrete due to deterioration in concrete structure, the compressive strength of concrete and tensile strength of reinforcing steel gradually decrease over time. Concrete exposed to cracks is neutralized and corrosion of reinforcing steel occurs. If the surface deterioration phenomenon occurs by safety diagnosis and inspection, the surface of the concrete structure should be repaired before the deterioration of the inside of the concrete structure is transferred before the time passes, so that the large construction for reinforcement can be prevented, It can be maintained for a long time.

The grinding step is a process of grinding the surface of the deteriorated concrete before the uniformity of the concrete is generated, and then finishing the surface of the concrete using the machine until the non-deteriorated part comes out.

2. Mortar application to protect concrete structure surface

In this step, the mortar of the concrete structure repair protection mortar is prepared by mixing the following six components to prepare a repairing agent, mixing 10 to 40 parts by weight of the filler and 20 to 70 parts by weight of the aggregate with 5 to 50 parts by weight of the repairing agent.

That is, the repairing agent according to the present invention

(a) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 0.05 to 0.2 parts by weight of a viscosity enhancer, 0.3 to 1.1 parts by weight of a fluidizing agent, 0.1 to 0.5 parts by weight of a curing accelerator, 0.1 to 0.4 parts by weight of a retarding agent, 2 to 7 parts by weight of a siliceous waterproofing agent, 5 to 15 parts by weight of a CSA- And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.

 (b) one or more powder or liquid rubber selected from among ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;

(c) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;

(d) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component;

(e) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant; And

(f) 10 to 50 parts by weight of water.

Hereinafter, the main components of the composition will be described in detail.

First, in the present invention, the powder component is a mixture of a first powder component and a second powder component, wherein the first powder component is a component serving as a binder and the second powder component is a component . ≪ / RTI >

The cement contained in the first powder component of the powder component according to the present invention is formed so as to increase strength such as initial compressive strength, flexural strength, adhesive strength, and shorten the curing time. Specifically, the above-mentioned cement component may be a general portland cement, or may be a mixture of a quick-speed cement, an alumina cement, an awwin cement, and the like.

In the present invention, the clinker contained in the first powder component of the powder component is composed of calcium silicate, alite, berylite, celite and the like. The clinker serves to promote the mixing of the binder and water. If the content of the clinker is less than 0.5 parts by weight, mixing of the binder and water is not easy. When the amount of the clinker is more than 10 parts by weight, the content of the clinker is preferably in the range of 0.5 to 10 parts by weight, There is a problem that the strength is lowered.

In addition, in the present invention, the gypsum contained in the first powder component of the powder component serves to improve the adhesion by increasing the viscosity when the binder is mixed with water. It is preferable that the gypsum is contained in the first powder component in the range of 1 to 10 parts by weight. When the content of the gypsum is less than 1 part by weight, the problem that the viscosity and adhesion of the repairing agent according to the present invention is lowered If it exceeds 10 parts by weight, there is a problem that the strength is lowered.

In addition, in the present invention, the plaster included in the first powder component of the powder component serves to easily mix the components contained in the binder with water. When the content of the plaster is less than 0.5 parts by weight, the various components contained in the binder are easily mixed with water. There is a difficult problem, and when it exceeds 10 parts by weight, the strength and chemical resistance are deteriorated.

Further, in the present invention, the alpha-hemihydrate gypsum contained in the first powder component of the powder component is obtained by heating the alumina solu- tion at a temperature of about 75 to 100 ° C under a reduced pressure of not less than -600 torr for not less than 1 hour, The alpha type hemihydrate gypsum is produced by heating with alpha type hemihydrate gypsum. When the alpha type hemihydrate gypsum is mixed with cement, the shrinkage expansion rate is nearly zero, and the effect of suppressing cracks due to expansion and contraction is exhibited. More specifically, in general, gypsum is largely classified into natural gypsum and chemical gypsum. The purity is determined according to the content of SO ₃ , and the gypsum gypsum is divided into the gypsum gypsum, half gypsum and anhydrous gypsum do. It is transformed into alpha type, beta type or anhydrous gypsum depending on the dehydration condition. It is transformed into beta type when dehydrated in a dry state, and alpha type when dehydrated in a wet state. Alpha-type hemihydrate gypsum has more than 10 times more strength than beta-type hemihydrate gypsum, has a short initial curing time, and has the effect of suppressing cracks due to expansion and shrinkage. In addition, the alpha-type hemihydrate gypsum plays a role of strengthening the high strength, quickness and expandability together with the CSA type expanding agent described later, and it plays a role of supplementing the disadvantage of the CSA type expanding agent.

In the present invention, it is preferable that the alpha-hemihydrate gypsum is contained in the first powder component in the range of 0.5 to 10 parts by weight. When the content of the alpha-hemihydrate gypsum is less than 0.5 part by weight, If the amount is more than 10 parts by weight, the reaction speed is increased and the pot life is shortened.

In the present invention, the silica fume contained in the first powder component of the powder component is an amorphous active silica having an average particle diameter of about 0.15 mu m and is a nearly spherical particle. Silica fume improves water resistance and chemical resistance by filling effect between binder particles due to the characteristics of spherical particles, and improves the strength of the filler. In particular, silica fume also plays a role in improving the adhesion performance of the repair agent. It is preferable that the silica fume is contained in the range of 0.1 to 5 parts by weight in the first powder component. When the content of the silica fume is less than 0.1 part by weight, the water repellency and chemical resistance of the filler are lowered, There is a problem, and when it exceeds 5 parts by weight, cracks may occur.

In addition, the fly ash contained in the first powder component of the powder component in the present invention (fly ash) is silicon burning coal in facilities that use coal-fired power plants the fuel remaining components remain in the oxide form oxide (SiO ₂ ) Or aluminum oxide (Al ₂ O ₃ ) component. When the fly ash is mixed with concrete, workability is improved, curing heat is lowered, and long-term strength and water tightness are improved, which is economical. It is preferable that the fly ash is contained in the first powder component in the range of 0.01 to 5 parts by weight. When the content of the fly ash is less than 0.01, the adhesion performance of the filler is deteriorated. When the fly ash is more than 5 parts by weight There is a problem that the chemical resistance is lowered.

In addition, the limestone included in the first powder component of the powder component in the present invention plays an auxiliary role in improving the adhesion of the repairing agent according to the present invention. It is preferable that the limestone is contained in the first powder component in the range of 0.5 to 10 parts by weight. When the content of the limestone is less than 0.5 part by weight, the effect of improving the adhesion of the repairing agent is lowered, There is a problem that the chemical resistance is deteriorated.

In the present invention, the blast furnace slag included in the first powder component of the powder component is a by-product generated in the process of manufacturing steel in an ironworks or the like. The main component of the blast furnace slag is alumina silicate. When the blast furnace slag is mixed with the binder, And serves to enhance the durability and chemical resistance of the repair agent. In particular, the blast furnace slag has a low water permeability and serves to improve the water resistance of the repair agent according to the present invention and to improve the resistance to freezing and thawing and salting. It is preferable that the blast furnace slag is contained in the first powder component in the range of 0.01 to 5 parts by weight. When the content of the slag is less than 0.01 part by weight, the durability, chemical resistance, water resistance, There is a problem that the resistance is lowered. When the amount exceeds 5 parts by weight, cracking of the repairing agent may occur and there is a problem that the weight of the repairing agent increases.

In the present invention, the calcined pozzolana contained in the first powder component of the powder component is prepared by adding calcium to natural pozzolana, which is mainly composed of fine red, volatile acid earth, To improve the water resistance of the repair or reinforcement according to the present invention. Specifically, a mixture obtained by mixing 100 parts by weight of natural povolacne with 1 to 20 parts by weight of calcium is calcined at 1000 to 1200 ° C. for 0.5 to 1 hour and then pulverized to have an average particle size of 10 to 20 μm . When the above-mentioned treated soapollane is applied to the mortar, it enhances the denseness of the tissue to increase water resistance and strength. It is preferable that the lower pozzolana is contained in the first powder component in a range of 0.01 to 5 parts by weight. When the content of the lower pozzolana is less than 0.01 part by weight, the water repellency of the repair agent is lowered and more than 10 parts by weight There is a problem that the strength of the repairing agent is lowered.

Also, in the present invention, the microsilica contained in the first powder component of the powder component is silica particles having a particle diameter of 10 to 200 탆, and serves to improve the strength and chemical resistance of the filler according to the present invention. If the content of the microsilica is less than 0.01 part by weight, the strength and chemical resistance of the filler deteriorate, and if the content of the microsilica exceeds 10 parts by weight There is a problem that the adhesion performance of the repair agent is deteriorated.

In the present invention, the second powder component of the powder component is used for minimizing side effects and improving the performance when the first powder component is used.

In the present invention, the siliceous waterproofing agent contained in the second powder component of the powder component improves the waterproofing property by chemically and physically filling the pores of the cemented product and making it densified. If the amount of the siliceous waterproofing agent is less than 2 parts by weight, the waterproof effect is insignificant. When the amount of the silicate-based waterproofing agent is more than 7 parts by weight, So that the physical properties are reduced.

In the present invention, it is preferable that the CSA (Calcium sulphoaluminate) based expansion agent contained in the second powder component of the powder component is included in the range of 5 to 15 parts by weight of the second powder component. If the content of the CSA-based expanding agent is less than 5 parts by weight, the effect of shrinkage reduction is insignificant. If the amount exceeds 15 parts by weight, expansion occurs to cause destruction of the cured body and physical properties such as strength may be deteriorated.

 In the present invention, the viscosity enhancer contained in the second powder component of the powder component may be a cellulose-based thickener, a starch-based thickener, or the like. In the present invention, the viscosity enhancer is preferably included in the second powder component in the range of 0.05 to 0.2 part by weight. If the amount is less than 0.05 part by weight, separation of the material may occur. If the amount is more than 0.2 part by weight, And the construction quality may be deteriorated.

In the present invention, the fluidizing agent contained in the second powder component of the powder component may be a fluidizing agent such as naphthalene-based, melamine-based, polycarboxylic-based or the like. In the present invention, it is preferable that the fluidizing agent is contained in the second powder component in the range of 0.3-1.1 parts by weight. If the content is less than 0.3 parts by weight, the effect of lowering the viscosity can not be exhibited. If the content is more than 1.1 parts by weight Problems such as material separation and bleeding may occur.

In the present invention, the curing accelerator contained in the second powder component of the powder component may be an inorganic curing accelerator such as a chloride, an alkali carbonate or an alkali aluminate such as CaCl ₂ , Na ₂ CO ₃ , Al (OH) ₃ or NaAlO ₂ And the curing accelerator is preferably included in the second powder component in the range of 0.1 to 0.5 parts by weight.

In the present invention, the retarder contained in the second powder component of the powder component has a function of suppressing the formation of cement hydrate and freely adjusts the curing time, and it is possible to use tartaric acid, gluconic acid, citric acid, . In the present invention, it is preferable that the retarder is contained in the range of 0.1 to 0.4 parts by weight in the second powder component.

The silica powder included in the second powder component of the powder component of the present invention is preferably included in the range of 42 to 64 parts by weight in consideration of the specific gravity of the composition.

In the present invention, the first powder component and the second powder component obtained by the above composition are mixed in the range of 10 to 70% by weight and 30 to 90% by weight, respectively, to form a powder component.

In the present invention, the modified latex component (b) is prepared by modifying a powdery or liquid latex rubber resin. The latex rubber resin preferably used in the present invention is one selected from ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR It is preferable to use a powdery or liquid polymer resin composed of two or more kinds of resin mixtures. In the present invention, the latex-based rubber resin exhibits an increase in fluidity, an increase in working time (working time) and an improvement in workability in a state before curing of mortar, and an increase in surface adhesion force, an increase in cohesive force, an increase in bending strength, And the like. In addition, the latex rubber resin prevents penetration of chlorides and moisture to prevent concrete from being corroded. In the present invention, it is preferable that the latex rubber resin is used by mixing a certain amount of ultra fast cement, carbon black and fibers in the powdery liquid rubber resin. In the present invention, the quick-speed cement can be used with an ultra-fast vulcanized cement such as Awun, and it strengthens the compressive strength when it is mixed with the latex rubber resin.

Also, in the present invention, the carbon black serves to improve the long-term compressive strength when it is mixed with the latex rubber resin.

In addition, when the fibers are mixed with a latex-based rubber resin, they improve bending strength and tensile strength. In the present invention, the fibers may be natural fibers such as cellulose, or synthetic fibers such as nylon and polyester.

In the present invention, the mixing ratio of the powder or the liquid rubber resin constituting the modified latex component to the ultra fast cement, the carbon black and the fiber is preferably 100: 1 to 20: 0.1 to 10: 0.1 to 10 by weight.

In the present invention, the modified latex component (b) is preferably used in an amount of 1 to 20 parts by weight based on 100 parts by weight of the powder component (a). If the modified latex component (b) is used in an amount of less than 1 part by weight, it is difficult to expect an increase in performance. If the modified latex component is used in an amount of more than 20 parts by weight, it may interfere with the formation of etrinzite.

In the present invention, the liquid component of (c) comprises 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.05 to 5 parts by weight of an initiator, and 0.05 to 5 parts by weight of an emulsifier.

In the present invention, the monomer component constituting the liquid component comprises methyl methacrylate, styrene monomer, n-butyl acrylate, methyl acrylate and isobornyl acrylate, wherein the initiator and the emulsifier are mixed.

Specifically, the methyl methacrylate (MMA) serves to improve the viscosity and adhesion of the repair agent according to the present invention. The methyl methacrylate is preferably included in the first liquid component in the range of 1 to 7 parts by weight. When the methyl methacrylate is contained in an amount of less than 1 part by weight, the viscosity of the repair agent is lowered, When the amount of the acrylic emulsion resin is more than 7 parts by weight, the acrylic emulsion resin can not be easily mixed with the long fibers and the binder due to the excessive viscosity. Thus, there is a problem that the dispersibility of the acrylic emulsion resin is deteriorated, There arises a problem that the workability is lowered.

The styrene monomer is polymerized in the form of a polymer by an initiator to promote hardening of the filler according to the present invention and increase the strength. When the styrene monomer is contained in an amount of less than 5 parts by weight, the hardening speed of the repairing agent is lowered and the strength of the hardened repairing agent is lowered If it exceeds 20 parts by weight, it is included more than necessary, which is not economical.

The n-butyl acrylate serves to improve the adhesion of the repair agent according to the present invention. When the amount of the n-butyl acrylate is less than 1 part by weight, the adhesion of the repairing agent decreases, and when 10 parts by weight of the n-butyl acrylate is added to the first liquid component, If it exceeds, economical efficiency decreases.

The methyl acrylate serves to improve the adhesion performance and strength of the filler according to the present invention. When the methyl acrylate is contained in an amount of less than 0.1 part by weight, the adhesion performance and the strength characteristics are lowered, and when 10 parts by weight of the methyl acrylate is contained in the first liquid component, If it exceeds, economical efficiency decreases.

The isobornyl acrylate serves to improve the dispersibility of components contained in the filler according to the present invention. The isobonyl acrylate is preferably contained in the range of 0.1 to 10 parts by weight based on the first liquid component. When the amount of the isobornyl acrylate is less than 0.1 part by weight, the dispersibility of various components decreases, There is a problem that it is difficult to obtain uniform physical properties. When the amount is more than 10 parts by weight, the addition amount of other components is limited, which makes it difficult to obtain excellent strength and adhesion performance of the repairing agent.

The present invention includes an initiator and an emulsifier in addition to the monomer component constituted as described above.

In the present invention, the initiator serves to initiate the polymerization reaction of the monomer component. Examples of the initiator include t-butyl peroxybenzoate, benzoyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, t-butyl Asecape, or 2,5-dimethylhexyl-2,5-diperoxybenzoate, and the like can be used. In the present invention, it is preferable that the initiator is used in the range of 0.05 to 5.0 parts by weight based on the liquid component. When the content of the initiator is less than 0.05 part by weight, the polymerization initiating reaction of the monomer is lowered, There is a problem that it is difficult to control the polymerization reaction efficiently if it exceeds 5.0 parts by weight.

In the present invention, when the water is added to the water-retaining agent according to the present invention, the emulsifier easily mixes the water-retaining agent with water. As the emulsifier in the present invention, a glycerin fatty acid ester, a sorbitan fatty acid ester, or a polyglycerin fatty acid ester may be used. In the present invention, it is preferable that the emulsifier is used in the range of 0.05 to 5.0 parts by weight based on the liquid component. When the content of the emulsifier is less than 0.05 part by weight, If it exceeds 5 parts by weight, there is a problem that the strength and adhesion performance of the repairing agent are difficult to be exerted.

In the present invention, the hydrophilic polyvinyl alcohol short fiber component (d) has a very high resistance to carbon-containing solvent, oil, salt and alkali, and has excellent resistance even when exposed to direct sunlight. In addition, the hydrophilic structure having hydroxyl group on the fiber surface is well dispersed in the liquid phase, has high elastic modulus and excellent adhesion to powder components, has a relatively small diameter to suppress and stabilize microcracks, It is very effective in increasing mechanical properties and is effective in suppressing cracks caused by fatigue and impact load.

The hydrophilic polyvinyl alcohol short fibers used in the present invention preferably have a specific gravity of 1.1 to 1.3 g / cm 3, a diameter of 9 to 12 μm, a tensile strength of 7,000 to 9,000 kgf / cm 2 and a length of 3 to 8 mm, It is preferably used in the range of about 1 to 10 parts by weight based on 100 parts by weight of the powder component. If the content of the hydrophilic polyvinyl alcohol short fiber is less than 1 part by weight, it is not effective to suppress plastic cracking, and if it exceeds 10 parts by weight, entanglement of fibers may occur.

In the present invention, as the additive component (e), it is preferable to use a mixture of a preservative, a defoamer, and a wetting agent in an appropriate ratio.

In the present invention, the preservative is used to prevent fungi or bacteria from living. The antifoaming agent is used to suppress the generation of bubbles during the mixing process of the liquid component and the powder component and the mortar production process. Specifically, Defoamer can be used. In addition, the wetting agent may be a low viscosity wetting agent as a surfactant for uniform mixing of the liquid component and the powder component.

In the present invention, the specific mixing ratio of the additive component is not particularly limited. For example, a preservative, a defoaming agent, and a wetting agent may be mixed in a weight ratio of 1: 10: 1 to 10: 1 to 10.

In the present invention, the additive component (e) is preferably used in an amount of about 1 to 5 parts by weight based on 100 parts by weight of the powder component.

In the present invention, the water of (f) is preferably pure water not mixed with impurities unnecessary for the cement hydration reaction, and is preferably used in a range of 10 to 50 parts by weight based on 100 parts by weight of the powder component .

The concrete structure repair agent obtained by the above composition exists in a state in which the liquid component and the powder component are separated from each other, and is mixed with the filler and the aggregate immediately before use to constitute a mortar composition, that is, a mortar composition for surface repair protection of concrete structures.

Specifically, the mortar composition for protecting the surface of the concrete structure according to the present invention comprises 5 to 50 parts by weight of the filler obtained by the composition of the present invention, 10 to 40 parts by weight of the filler and 20 to 70 parts by weight of the aggregate.

In the present invention, the filler may be at least one selected from limestone, abrasive, and talc. The content thereof is preferably in the range of 10 to 40 parts by weight. If the amount is less than 10 parts by weight, the effect of inhibiting the shrinkage of the mortar-cured body may be insignificant and the amount of drying shrinkage may increase. If the amount is more than 40 parts by weight, the amount of filler may be excessive and the fluidity and workability may be deteriorated.

The aggregate is preferably silica sand, and silica sand having a particle size of 0.2 to 2.5 mm is suitable for producing a mortar having good adhesion without being separated from water. It is preferable that the aggregate has a ratio of 20 to 70 parts by weight with respect to the whole mortar composition in consideration of workability to mortar.

The mortar composition may further comprise at least one additive selected from 0.1 to 10 parts by weight of a dispersant, 0.01 to 3 parts by weight of an antifoamer and 0.01 to 10 parts by weight of a retarder, if necessary.

In the step (1), the mortar composition for surface repair protection of the concrete structure prepared above is applied to the surface of the concrete structure having the surface-cleaned surface to repair it.

More specifically, in the step of applying the mortar composition for surface repair protection of the concrete structure, it is preferable that the step of applying and finishing the mortar composition is 0.5 to 5.0 mm when pouring using spray or trowel, but the thickness is not limited to the thickness of the ground concrete Can be changed accordingly.

In addition, the mortar composition for protecting the surface of the concrete structure according to the present invention may further include an underwater separating agent for repairing the underwater concrete structure. The underwater bleaching agent is added to prevent the degradation of the mortar composition by improving the viscosity of the mortar composition. Examples thereof include methylcellulose such as methylcellulose, hydroxymethylcellulose and carboxymethylcellulose; Ethyl celluloses such as ethyl cellulose, hydroxyethyl cellulose and carboxyethyl cellulose; Cellulose type thickeners selected from propyl cellulose such as hydroxypropyl cellulose can be used. The content is preferably 0.1 to 3 parts by weight based on 100 parts by weight of the powder component, because it exhibits an appropriate viscosity. If necessary, a water-soluble acrylic resin powder may be further added to further increase the viscosity in water. The water-soluble acrylic resin powder is preferably used in an amount of 1 to 30 parts by weight based on 100 parts by weight of the water-reducing agent.

The present invention may further comprise at least one additive selected from 0.1 to 10 parts by weight of a dispersant, 0.01 to 3 parts by weight of an antifoamer and 0.01 to 10 parts by weight of a retarder, based on 100 parts by weight of the powder component .

The dispersant adsorbs on the surface of the particles of the mortar to impart charge to the particle surface, causing mutual reaction between the particles, so that the aggregated particles are dispersed to increase the flow, thereby making it possible to increase the strength due to the water reducing effect. As the dispersing agent, a conventional water reducing agent can be used, and it can be used singly or in a mixture of two or more thereof, for example, from the group consisting of lignin sulfonate, polynaphthalene sulfonate, polymelamine sulfonate or polycarboxylate type water reducing agent. The dispersant is preferably used in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the powder component. When the amount of the dispersant is less than 0.1 parts by weight, the performance is not exhibited. When the amount of the dispersant is more than 10 parts by weight, The mortar viscosity is lowered and the material separation occurs.

The antifoaming agent is used to remove macropores in the mortar to improve the strength and appearance of the mortar. Antifoaming agents include mineral oil defoamers such as kerosene and liquid paraffin; Retentive defoamers such as animal and vegetable oils, sesame oil, castor oil and their alkylene oxide adducts; Fatty acid defoaming agents such as oleic acid, stearic acid and alkylene oxide adducts thereof; Fatty acid ester defoaming agents such as glycerin monoricinolate, alkenyl succinic acid liquid, sorbitol monolaurate, sorbitol trioleate, natural wax and the like; (Poly) oxyalkylene sorbitan fatty acid esters, (poly) oxyalkylene alkyl (aryl) ethers, polyoxyalkylene polyoxyalkylene ethers, polyoxyalkylene ethers, acetylene ethers, Oxyalkylene antifoaming agents such as sulfuric acid ester salts, (poly) oxyalkylene alkyl phosphoric acid esters, (poly) oxyalkylene alkylamines and (poly) oxyalkylene amides; Alcohol-based antifoaming agents such as octyl alcohol, hexadecyl alcohol, acetylene alcohol, glycols and the like; Amide-based antifoaming agents such as acrylate polyamines and the like; Phosphoric acid ester antifoaming agents such as tributyl phosphate, sodium octyl phosphate and the like; Metal soap defoamers such as aluminum stearate, calcium oleate and the like; Silicone antifoaming agents such as dimethyl silicone oil, silicone paste, silicone emulsion, organic modified polysiloxane (polyorganosiloxane such as dimethyl polysiloxane), fluorosilicone oil and the like can be used. The defoaming agent is preferably used in an amount of 0.01 to 3 parts by weight based on 100 parts by weight of the powder component. When the defoaming agent is used in an amount of less than 0.01 part by weight, the ability to remove bubbles generated during stirring is remarkably lowered. The strength of the composition is lowered.

The retarder may be added for the purpose of ensuring workability for a certain period of time by adjusting the hydration rate of the mortar. Examples of the delaying agent include boric acid salts such as boric acid and borax, boric acid salts such as sodium borate and potassium borate, gluconic acid, citric acid, tartaric acid, glucoheptonic acid, arabic acid, malic acid or citric acid and sodium, potassium, calcium, magnesium, An oxycarboxylic acid such as an inorganic salt or an organic salt; There may be mentioned monosaccharides such as glucose, fructose, galactose, saccharose, xylose, avitose, lipoose and isomerized sugar, oligosaccharides such as 2 sugars and 3 sugars, oligosaccharides such as dextrin, polysaccharides such as dextran, Saccharides such as molasses and the like containing them; Sugar alcohols such as sorbitol; Magnesium styrenesulfonate; Phosphoric acid and its salts or boric acid esters; Aminocarboxylic acids and their salts; Alkali-soluble proteins; Fumic acid; Tannic acid; phenol; Polyhydric alcohols such as glycerin; Aminotri (methylenephosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, ethylenediamine tetra (methylenephosphonic acid), diethylenetriamine penta (methylenephosphonic acid) and their alkali metal salts, And phosphonic acid and derivatives thereof such as earth metal salts. It is preferable that the content thereof is 0.01 to 10 parts by weight based on 100 parts by weight of the powder component.

3. Coating application

Then, when the mortar composition for surface repair protection of the poured concrete structure is cured, the surface is finished. The surface finishing operation is completed by applying a coating agent to the surface on which the mortar composition is cured.

In the present invention, as the coating agent, it is preferable to use an aqueous coating agent composed of a main component and a curing agent component.

More specifically, in the present invention, the coating agent may contain 10 to 50 wt% of an epoxy resin, 5 to 40 wt% of a polymethyl methacrylate resin, 1 to 25 wt% of a reactive diluent, 0.1 to 15 wt% of a flocculant, 1 to 20% by weight of a water-soluble oil, 1 to 10% by weight of an emulsifier, 1 to 10% by weight of a water-soluble oil, 0.1 to 5% by weight of an emulsifier, 5 to 20% by weight of an accelerator, and 50 to 90% by weight of water are mixed to prepare an aqueous solution, and 5 to 50 parts by weight of a polyamide and 0.1 to 40 parts by weight of an amine compound, based on 100 parts by weight of the obtained aqueous solution, Based on the total weight of the epoxy resin composition.

At this time, the epoxy resin used in the present invention may be a commonly used epoxy resin, and general epoxy resin, chlorine-containing epoxy resin, novolac epoxy resin, brominated epoxy resin or a mixture thereof may be used.

In addition, the polymethylmethacrylate (PMMA) resin in the present invention enhances the weather resistance of the epoxy resin composition and smoothly accelerates curing and drying. In the present invention, the polymethyl methacrylate resin preferably has a weight average molecular weight in the range of 10,000 to 300,000.

In the present invention, n-butyl glycidyl ether may be used as the reactive diluent.

In the present invention, the coagulant may be silicon dioxide, aerosil, bentonite nanoparticles, silica nanoparticles or the like.

In the present invention, the inorganic filler may be at least one selected from the group consisting of powders of calcium carbonate, talc, heavy carbon, ceramics, clay, silica and dolomite.

In the present invention, the promoter may be phenol.

In the present invention, the emulsifier may be a copolymer of polyoxyethylene and polyoxypropylene.

The polyamide preferably has a weight average molecular weight of 1,000 to 5,000, more preferably 1,000 to 4,000.

In the present invention, the amine compound may be polyoxypropylene diamine.

In the present invention, the water-soluble oil used for preparing the aqueous hardener component may be a silicone oil or an acetate oil.

In the present invention, the host component is cured by the curing agent component to increase cross-linking, and has a good curing property by bringing about the activation of the gravitational force by the gradual rate control in the curing reaction. Also, in the curing process, the epoxy resin is formed in close contact with the inner side by the action of the coagulating agent and is not exposed to the surface, and the inorganic component aggregates on the surface to form a matte inorganic layer, . Accordingly, peeling and cracking of the inorganic layer can be prevented, moisture resistance and weather resistance are improved, surface deterioration is prevented, and durability is improved.

The coating agent is preferably applied to the surface of the mortar in a range of 100 to 200 g / m ² .

The mortar composition for protecting the surface of the concrete structure according to the present invention has the effect of improving the durability of the concrete structure by suppressing penetration of deteriorating substances such as salts and acidic substances and has excellent compatibility with cement.

The mortar composition for surface repair protection of concrete structures according to the present invention is excellent in adhesion with existing base material concrete and does not have a neutralization reaction with concrete and is resistant to aging due to water resistance, ozone resistance, chemical resistance, water resistance, There is a merit that the phenomenon of occurrence of the phenomenon occurs.

In addition, the mortar composition for surface repair and maintenance of concrete structures according to the present invention is excellent in air permeability, does not cause condensation, does not oxidize the surface of the structure, has excellent permeability, hardens the infiltrated product, And has excellent waterproofness. Especially, it has the advantage of preventing cracking of the matrix in which shrinkage and expansion due to temperature changes are repeated, and is excellent in stretchability and is very suitable for work in a vibration area.

In addition, the mortar composition for protecting the surface of the concrete structure according to the present invention is excellent in strength to obtain a good structure, inhibits the penetration of carbon dioxide, and prevents water infiltration. The mortar composition for protecting the surface of the concrete structure according to the present invention has a low volatile organic compound (VOC) content and is environmentally friendly, has no air pollution, exhibits high strength, has excellent early strength, Is excellent and suppresses the generation of cracks. The mortar composition for protecting the surface of the concrete structure according to the present invention is excellent in water resistance, weather resistance, chemical resistance and stain resistance and can protect the matrix and the finish surface from chemical gas, exhaust gas and rainwater, It does not use organic solvent (thinner, etc.) for construction and equipment cleaning, so there is no environmental pollution.

In addition, the mortar composition for protecting the surface of the concrete structure according to the present invention is excellent in compatibility between the liquid component and the powder component and is easy to form and easy to work, and is excellent in workability. The mortar composition for surface repair protection of concrete structures according to the present invention is excellent in high elasticity, smoothness, low-temperature stability (cracking resistance) and odorlessness, exhibits good dispersing action with a small mixing ratio with water, maintains uniform strength and high strength . In addition, it forms a dense tissue with high density through good dispersing action, and is excellent in chemical resistance (salt resistance and acid resistance) and inhibits penetration of water, oil and the like.

In addition, since the mortar composition for protecting the surface of the concrete structure according to the present invention is an inorganic material such as concrete, it is excellent in adhesion force due to affinity of similar materials and excellent in both short-term bond strength and long- And it is economical. In addition, when the mortar composition for protecting the surface of the concrete structure according to the present invention is used, there is an advantage that cracks are not generated due to proper balance of strength and stability.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the following examples.

[Preparation Example 1] - Preparation of mortar composition

70 weight parts of Portland cement, 5 weight parts of clinker, 5 weight parts of gypsum, 5 weight parts of plaster, 5 weight parts of alpha type hemihydrate gypsum, 3 weight parts of silica fume, 3 weight parts of fly ash, 7 weight parts of limestone, , 7 parts by weight of calcined pozzolan and 3 parts by weight of microsilica were mixed to prepare a first powder component,

5 parts by weight of a siliceous waterproofing agent, 10 parts by weight of a CSA-based swelling agent, 0.1 part by weight of a viscosity enhancer, 1.0 part by weight of a fluidizing agent, 0.2 part by weight of a curing accelerator, 0.2 parts by weight of a retarder, After that,

The obtained first powder component and second powder component were mixed at a weight ratio of 50:50 to obtain a powder component.

Subsequently, the modified latex component was obtained by mixing the ultra-fast cement, carbon black and fibers with the SBR powder resin, and 10 parts by weight of the modified powder component was prepared based on 100 parts by weight of the powder component.

Subsequently, 5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate and 5 parts by weight of isobornyl acrylate were mixed, and 3 parts by weight of t-butyl peroxybenzoate And 4 parts by weight of glycerin fatty acid ester were mixed to obtain a liquid component, and 10 parts by weight of the powder component was prepared based on 100 parts by weight of the powder component.

Next, hydrophilic polyvinyl alcohol short fibers were prepared in an amount of 5 parts by weight based on 100 parts by weight of the powder component.

Then, 3 parts by weight of an additive component composed of a mixture of preservative, antifoaming agent and humectant was prepared.

The obtained materials were mixed with 40 parts by weight of water before use to obtain a repairing composition. To 40 parts by weight of the above-prepared filler composition were added 30 parts by weight of filler comprising talc and talc and 60 parts by weight of silica sand to prepare a repair mortar composition .

[Comparative Preparation Example 1] - Preparation of mortar composition (Experiment using composition of Korean Patent No. 10-1528120)

7 parts by weight of methyl methacrylate, 8 parts by weight of styrene monomer, 10 parts by weight of n-butyl acrylate, 10 parts by weight of methyl acrylate and 5 parts by weight of isobornyl acrylate were mixed to prepare a first liquid component, 3 parts by weight of oxybenzoate and 3 parts by weight of glycerin fatty acid ester were mixed to prepare a second liquid component. Then, 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume , 3 parts by weight of fly ash, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolanas and 3 parts by weight of microsilica were mixed to prepare a first powder component. 20 parts by weight of oyster shell powder, 10 parts by weight of purified water sludge powder 10 , 20 parts by weight of waste glass powder, and 40 parts by weight of waste stone powder were mixed to prepare a second powder component.

Then, the first liquid component and the second liquid component were mixed at a weight ratio of 90:10 to prepare a liquid component. Then, based on 100 parts by weight of the liquid component, 5 parts by weight of the first powder component, 8 parts by weight of a powder component and 3 parts by weight of a cellulose long fiber were mixed to prepare a repairing composition.

Forty parts by weight of the above-prepared repair filler composition was mixed with 40 parts by weight of filler comprising talc and talc and 70 parts by weight of silica sand to prepare a mortar composition.

[Comparative Preparation Example 2] - Preparation of mortar composition

5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, and 3 parts by weight of fly ash 3 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fiber were mixed to prepare a repair composition.

30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

[Comparative Preparation Example 3] - Preparation of mortar composition

5 parts by weight of styrene monomer, 5 parts by weight of t-butyl peroxybenzoate and 5 parts by weight of glycerin fatty acid ester were mixed, and 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of fume, 3 parts by weight of fly ash, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolanas, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fibers.

30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

[Comparative Preparation Example 4] - Preparation of mortar composition

30 parts by weight of n-butyl acrylate and 5 parts by weight of glycerin fatty acid ester were mixed, and 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fiber were mixed to prepare a repair composition.

30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

[Comparative Preparation Example 5] - Preparation of mortar composition

30 parts by weight of isobornyl acrylate and 5 parts by weight of glycerin fatty acid ester were mixed. Then, 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fiber were mixed to prepare a repair composition.

20 parts by weight of a filler comprising stoneware and talc and 70 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

[Comparative Production Example 6] - Preparation of mortar composition

5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isobornyl acrylate, 0.1 part by weight of t-butyl peroxybenzoate, And 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 3 parts by weight of fly ash, 7 parts by weight of limestone, 7 parts by weight of calcined pozzolanas, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fibers were mixed to prepare a repair agent composition.

20 parts by weight of a filler comprising stoneware and talc and 70 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

[Comparative Preparation Example 7] - Preparation of mortar composition

5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isobornyl acrylate, 0.1 part by weight of t-butyl peroxybenzoate, And 0.1 part by weight of ester were mixed, and 46 parts by weight of limestone was further mixed therewith to prepare a repairing composition.

30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

[Manufacturing Example 2] - Preparation of coating agent

About 25% by weight of an epoxy resin, about 25% by weight of a polymethylmethacrylate resin, about 10% by weight of n-butyl glycidyl ether, about 5.0% by weight of silicon dioxide, about 10% About 10 wt.% Of a copolymer of polyoxyethylene and polyoxypropylene, and 100 wt.% Of a mixture of water and a balance of water to prepare 100 wt.% Of a main component, about 10 wt.% Of a water-soluble silicone oil, About 25% by weight of a polyamide and 10.0% by weight of an amine compound were mixed based on 100% by weight of an aqueous solution obtained by mixing about 5% by weight of a copolymer of propylene, about 10% by weight of a phenol accelerator, After obtaining a curing agent component, the curing agent component thus obtained was mixed at a ratio of about 25 parts by weight based on 100 parts by weight of the main component, to prepare an epoxy coating agent.

[Comparative Production Example 8] - Coating agent

A commercially available general epoxy resin coating (Sikafloor, 1004K) was used.

<Performance evaluation of mortar>

1. Evaluation of compressive strength with time

The compressive strength of the repair mortar composition prepared according to Preparation Example 1 and Comparative Preparation Examples 1 to 7 over time was evaluated according to the method of KS F 2405, and the results are shown in Table 1.

Sample 1 hour (Mpa) 3 hours (Mpa) 6 hours (Mpa) 24 hours (Mpa) 7 days (Mpa) Production Example 1 16.2 25.1 35.9 40.8 42.0 Comparative Preparation Example 1 8.5 16.9 19.1 25.5 28.1 Comparative Production Example 2 9.2 18.5 19.9 25.1 27.8 Comparative Production Example 3 10.1 19.0 22.1 26.9 28.9 Comparative Production Example 4 9.5 18.2 23.0 25.2 28.0 Comparative Preparation Example 5 8.2 17.0 20.1 25.9 27.8 Comparative Preparation Example 6 9.7 19.2 22.0 23.8 25.1 Comparative Preparation Example 7 10.8 21.0 23.9 27.0 29.9

As can be seen from the results of Table 1, the initial strength characteristics of Preparation Example 1, which is a mortar composition for the surface repair protection of concrete structures according to the present invention, are higher than those of Comparative Preparation Examples 1 to 7, which are conventional mortar compositions, . Accordingly, since the working time can be minimized, it is possible to shorten the repair work time, thereby reducing the total air and cost.

2. Evaluation of bending strength according to time

The bending strength with time of the mortar composition for repair and reinforcement prepared according to Preparation Example 1 and Comparative Preparation Examples 1 to 7 was evaluated according to the method of KS F 2408 and the results are shown in Table 2.

Sample 1 hour (Mpa) 3 hours (Mpa) 6 hours (Mpa) 24 hours (Mpa) 7 days (Mpa) Production Example 1 3.9 5.9 6.8 8.0 9.5 Comparative Preparation Example 1 2.5 4.5 5.0 6.4 7.2 Comparative Production Example 2 2.6 4.7 5.3 6.1 6.9 Comparative Production Example 3 2.9 4.5 5.1 6.2 7.0 Comparative Production Example 4 3.0 4.1 4.9 5.8 6.8 Comparative Preparation Example 5 2.5 4.2 4.9 5.5 6.5 Comparative Preparation Example 6 2.6 4.6 5.3 6.3 7.0 Comparative Preparation Example 7 2.9 5.0 5.9 6.5 7.5

As shown in the results of Table 2, it can be seen that the bending strength characteristics of Preparation Example 1, which is a mortar composition for protecting the surface of the concrete structure according to the present invention, are much higher than those of Comparative Examples 1 to 7 which are conventional mortar compositions have. As a result, it can be seen that the bonding strength with the existing pavement is excellent and it is suitable to be used for repairing the surface of the concrete structure.

3. Bending strength, compressive strength, tensile strength, bond strength and volume change rate test

The flexural strength, compressive strength, tensile strength, volume change rate and adhesion strength of the mortar composition for surface repair protection of concrete structures produced according to Production Example 1 and Comparative Production Examples 1 to 7 were measured.

The bending strength, compressive strength, tensile strength and adhesion strength were measured according to the standard of KS F 4042-02 after 28 days of the application of the concrete repair agent. The volume change rate was such that the volume of the mortar after 28 days of application was changed from 0 ° C to 35 ° C . The results are shown in Table 3 below.

Sample Flexural strength
(N / mm &lt; 2 & Compressive strength
(N / mm &lt; 2 & The tensile strength
(N / mm &lt; 2 & Bond strength
(MPa) Volume change rate
(%) Production Example 1 25.0 72.8 12.0 3.5 0.0001 Comparative Preparation Example 1 17.2 50.0 5.0 2.0 0.0005 Comparative Production Example 2 15.5 35.5 3.5 0.5 0.0009 Comparative Production Example 3 10.6 40.0 4.0 1.2 0.0012 Comparative Production Example 4 8.5 30.5 3.8 1.0 0.0008 Comparative Preparation Example 5 11.2 35.0 2.9 0.8 0.0009 Comparative Preparation Example 6 8.9 35.5 4.4 0.9 0.0010 Comparative Preparation Example 7 10.8 38.0 4.2 1.1 0.0015

Referring to Table 3, it can be seen that the mortar composition for protecting the surface of the concrete structure according to the present invention is superior in strength and adhesion performance as compared with conventional materials.

4. Waterproof and chemical resistance test

The waterproofing and chemical resistance of the mortar composition for surface repair protection of concrete structures prepared according to Preparation Example 1 and Comparative Preparation Examples 1 to 7 were measured.

The waterproof property was evaluated by applying a mortar composition for surface repair protection of the concrete structure on a concrete structure to a thickness of 1 cm and installing a cylindrical water tank on the mortar composition layer to check the permeation of water for 6 months.

The chemical resistance was evaluated by treating the mortar composition layer having a salt concentration of 35 ‰ and the sulfuric acid solution having a concentration of 2% on the mortar composition layer after 28 days of curing on the concrete structure for 1 hour each day, And was confirmed for 60 days.

The results are shown in Table 4 below.

Sample Water resistance test
(month) Chemical resistance test (days) Brine Sulfuric acid solution Production Example 1 - - 45 Comparative Preparation Example 1 One 5 15 Comparative Production Example 2 One 20 5 Comparative Production Example 3 2 35 10 Comparative Production Example 4 One 40 15 Comparative Preparation Example 5 2 26 8 Comparative Preparation Example 6 One 39 12 Comparative Preparation Example 7 One 27 9

As shown in Table 4, in the case of Production Example 1, moisture was not penetrated at all for 6 months, while in Comparative Production Examples 1 to 7, it was confirmed that moisture penetrated after 1 to 2 months. This is interpreted as a result of showing the excellent waterproof performance of the mortar composition for protecting the surface of the concrete structure according to the present invention.

As shown in Table 4, in the case of Production Example 1, surface damage was not caused at all by the brine treated for 60 days, and when the sulfuric acid solution was treated, surface damage did not occur for 45 to 52 days. On the other hand, in the case of Comparative Production Examples 1 to 7, surface damage occurred 20 to 40 days after the saline treatment, and surface damage was observed within 5 to 15 days after the treatment with the sulfuric acid solution.

This is interpreted as a result of supporting the excellent chemical resistance of the mortar composition for protecting the surface of the concrete structure according to the present invention.

5. Freeze-thaw resistance, crack resistance and dry shrink resistance

Freezing and thawing resistance, cracking resistance and drying shrinkage resistance of the mortar composition for surface repair protection of concrete structures produced according to Production Example 1 and Comparative Production Examples 1 to 7 were measured.

The freeze-thaw resistance was tested by the freeze-thaw resistance test according to KS F 2456.

Crack resistance was tested according to AASHTO PP34-98.

Dry shrinkage resistance was tested according to KS F 2424.

The results are shown in Table 5.

Sample Freeze-thaw resistance (%) Crack resistance Dry shrinkage resistance Reference value: 80% or more Reference value: No crack up to 56 days Reference value: 0.15 or less Production Example 1 95 No crack 0.01 Comparative Preparation Example 1 88 No crack 0.02 Comparative Production Example 2 87 No crack 0.03 Comparative Production Example 3 82 No crack 0.03 Comparative Production Example 4 82 No crack 0.05 Comparative Preparation Example 5 80 No crack 0.05 Comparative Preparation Example 6 80 No crack 0.04 Comparative Preparation Example 7 80 No crack 0.04

As shown in Table 5, the mortar composition for surface repair protection of concrete structures of Production Example 1 according to the present invention is superior to the conventional materials in terms of freezing-thawing resistance, cracking resistance and drying shrinkage resistance.

< Example  And Comparative Example >

[Example 1]

The surface of the concrete structure is ground using a grinder and the surface is trimmed until the undegraded part is removed. Then, the mortar composition prepared in Preparation Example 1 was applied to smooth the surface of the concrete structure, followed by drying. The dried mortar surface was coated with a coating agent prepared in Preparation Example 2 to a thickness of 100 탆 and then dried to complete the repair protection work.

[Comparative Example 1]

The procedure of Example 1 was repeated except that the mortar composition prepared in Comparative Preparation Example 1 was used as the mortar composition.

[Comparative Example 2]

The procedure of Example 1 was repeated except that the mortar composition prepared in Comparative Preparation Example 2 was used as the mortar composition.

[Comparative Example 3]

The procedure of Example 1 was repeated except that the mortar composition prepared in Comparative Preparation Example 1 was used as the mortar composition and the coating composition prepared in Comparative Preparation Example 8 was used as the coating material.

[Comparative Example 4]

The procedure of Example 1 was repeated except that the mortar composition prepared in Comparative Preparation Example 2 was used as the mortar composition and the coating material prepared in Comparative Preparation Example 8 was used as the coating material.

1. Evaluation of temperature and humidity change

The internal temperature and humidity changes after the repair and reinforcement work carried out through the above examples and comparative examples were measured, and the results as shown in Table 6 were obtained.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Temperature change Humidity change Temperature change Humidity change Temperature change Humidity change Temperature change Humidity change Temperature change Humidity change 1 time +10 +0.01 +18 +0.13 +19 +0.14 +15 +0.18 +19 +0.21 Episode 2 +9 +0.04 +18 +0.13 +20 +0.12 +16 +0.19 +19 +0.15 Condition External: Maintains temperature 80 ℃, relative humidity 100%
Internal (initial): start test at 20 ° C and 20% relative humidity
Measurement of internal temperature and humidity change after 48 hours

From the results shown in Table 6, it can be seen that when the method for repairing and repairing the surface of concrete structures according to the present invention is used, there is almost no change in temperature and humidity, and thus the waterproofing performance is excellent.

2. Weatherability evaluation

ASTM G 155 for 200 hours. The measurement conditions are as follows.

1) Light Sourse: 6500w Xenone Arc, Irradance: 0.35W / ㎡

2) B.P.T. : 63 ° C ± 3 ° C, Humidity: 50% ± 5% RH

3) Inner / Outer Filter: Borosilicate / borosilicate

4) Spray Cycle: After 102 minutes light irradiation, 18 minutes light irradiation and water spray

3. Evaluation of surface hardness

Pencil hardness: measured according to KS D 6711.

4. Water resistance evaluation

The time at which surface deformation (cracks, blisters, etc.) occurred continuously in 90 ° C hot water was measured.

The results of evaluation of weather resistance, surface hardness and water resistance in Example 1 and Comparative Example 1-4 are shown in Table 7.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Weatherability (white) DELTA E1.0 E3.4 E4.0 E3.6 E4.0 Surface hardness 4H 1H 1H 1H 2H Water resistance 390hr 190hr 230hr 240hr 180hr

From the results of Tables 6 and 7, it can be seen that the use of the method for repairing and repairing the surface of concrete structures according to the present invention provides excellent performance of mortar, excellent water barrier performance, weatherability, surface hardness and water resistance, And the effect of maintenance protection can be maintained for a long period of time.

Claims (5)

(1) grinding a surface of a concrete structure requiring repair to trim the surface;
(2) applying the mortar to the surface of the trimmed concrete structure,
(a) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 0.05 to 0.2 parts by weight of a viscosity enhancer, 0.3 to 1.1 parts by weight of a fluidizing agent, 0.1 to 0.5 parts by weight of a curing accelerator, 0.1 to 0.4 parts by weight of a retarding agent, 2 to 7 parts by weight of a siliceous waterproofing agent, 5 to 15 parts by weight of a CSA- And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.
(b) one or more powder or liquid rubber selected from among ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;
(c) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;
(d) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component;
(e) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant; And
(f) 10 to 50 parts by weight of water, wherein the filler and the aggregate are mixed, wherein the filler and the aggregate are mixed with 5 to 50 parts by weight, 10 to 40 parts by weight of the filler and 20 to 70 parts by weight of the aggregate, Applying a mortar for use; And
(3) After the maintenance mortar is cured,
Wherein the reactive diluent comprises from 10 to 50% by weight of an epoxy resin, from 5 to 40% by weight of a polymethyl methacrylate resin, from 1 to 25% by weight of a reactive diluent, from 0.1 to 15% by weight of a flocculant, from 1 to 20% 1 to 20% by weight of a water-soluble oil, 1 to 10% by weight of an emulsifier, 5 to 20% by weight of an accelerator, and 50 to 50% by weight, based on 100 parts by weight of a main component obtained by mixing 0.05 to 20% by weight of an emulsifier and 10 to 80% Based on 100 parts by weight of the obtained aqueous solution, 5 to 50 parts by weight of a polyamide and 0.1 to 40 parts by weight of an amine compound are mixed in an amount of 5 to 50 parts by weight based on 100 parts by weight of the obtained aqueous solution, ;
A method of repairing the surface of a concrete structure.
[2] The method according to claim 1, wherein in (2), the mixture of 100 parts by weight of natural pazololane and 1 to 20 parts by weight of calcium is heated at 1000 to 1200 ° C. for 0.5 to 1 hour, And crushing the mixture to a particle size of 10 to 20 mu. The method for repairing the surface of a concrete structure.
The method according to claim 1, wherein the emulsifier (2) is a copolymer of polyoxyethylene and polyoxypropylene, and the accelerator is phenol.
The method for repairing a surface of a concrete structure according to claim 1, wherein the water-soluble oil used for producing the aqueous hardener component (2) is a silicone oil or an acetate oil.
The method according to claim 1, wherein the coating agent is applied in a range of 100 to 200 g / m ² .