KR101831709B1 - Lightweight repair agent composition for repairing the concrete structure and repairing method of the concrete structure therewith - Google Patents

Abstract

The present invention relates to a lightweight mortar repair material composition for repairing a concrete structure and a repairing method of the concrete structure using the same. The lightweight mortar repair material composition for repairing a concrete structure includes: 5-75 wt% of a lightweight inorganic binder; 10-80 wt% of fine aggregate; 0.01-20 wt% of functional improvement agent; and 0.01-25 wt% of water. The lightweight inorganic binder includes: 10-85 wt% of crude Portland cement; 5-55 wt% of blast furnace slag powder; 5-30 wt% of hollow silica; 1-20 wt% of anhydrous gypsum; 0.1-20 wt% of volcanic ash; 0.1-15 wt% of tricalcium aluminate; 0.01-10 wt% of magnesite; 0.01-10 wt% of peat; 0.001-10 wt% of fibroferrite; and 0.001-10 wt% of retarder. The present invention has an effect of remarkably reducing maintenance costs by preventing concrete corrosion caused by chemical erosion in facilities such as an underground structure, a marine structure, a marine concrete structure, an underground concrete structure, a concrete structure in poor environment, and a sewer pipe by having excellent strength and durability, especially acid and salt resistance, by using an environmentally friendly lightweight inorganic binder having excellent acid and salt resistance and a functional improvement agent having excellent fluidity, toughness, adhesion, acid resistance, water resistance, and durability. The present invention provides excellent light weight, insulation, and strength and also provides excellent acid and salt resistance by using fine aggregate mixed with mica and silica having light weight, pozzolan characteristics, and far infrared effects.

Description

TECHNICAL FIELD [0001] The present invention relates to a lightweight mortar repair material composition for repairing a concrete structure, and a method of repairing a concrete structure using the same. BACKGROUND OF THE INVENTION [0002]

The present invention relates to a lightweight mortar repair composition for repairing a concrete structure having improved functionality and a method for repairing a concrete structure using the same. More particularly, the present invention relates to a lightweight mortar repair composition excellent in durability, particularly in acid and salt resistance, A lightweight mortar repairing composition for repairing concrete structures excellent in strength, adhesive strength, acid resistance, salt resistance and durability, and a method for repairing a concrete structure using the same.

Reinforced concrete structures, facilities such as power plants and chemical facilities, sewer pipes and wastewater treatment plants are contacted with acidic gas or direct acidic wastewater, so that the aging of structures is proceeding more rapidly. In addition to the facilities that can be checked out, underground buried facilities and underwater structures are undergoing aging. Various materials and methods for repairing the deteriorated section of exposed concrete structures under acidic environment have been developed and applied, but the durability of acidic environment is insufficient. Furthermore, concrete structures of water purification plants and reservoirs are exposed to such substances and accelerate deterioration because water is purified by chlorine, ozone, and the like.

It is very probable that chemical corrosion problems occur in the general environment. It is very probable that the organic matter contained in the sewage can be reacted by the bacteria to generate sulfate ions, thereby eroding the concrete, or by the acidic material such as the spring zone or acid rain, And corrosion of reinforced concrete structures located in the marine environment is often caused by corrosion of concrete structures. Structures subject to chemical corrosion include marine concrete, chemical plants, food factories, related structures such as the floor of the house, soil contamination and underground structures in the hot springs, sewer related sewer pipes and closure structures.

In the case of these concrete structures, polymer cement concrete mixed with cement and polymer and polymer concrete using polymer, or pores of concrete which is the main penetration route of chloride ion are impregnated with synthetic resin Polymer impregnated concrete is proposed to be used.

The object of the present invention is to provide a waterproofing composition which is excellent in strength and durability, particularly in acid resistance and salt resistance, by using an environmentally friendly lightweight inorganic binder excellent in acid resistance and salt resistance and a function improver excellent in fluidity, toughness, adhesion, acid resistance, water resistance and durability It can prevent corrosion of concrete caused by chemical erosion of underground structure, exponential structure, marine concrete structure, underwater concrete structure, concrete structure under poor environment, sewer pipe, etc., Lightweight, lightweight, lightweight, heat-resistant, and excellent in durability against acid, salt and so on by using lightweight sericite, silical silica sand, and fine aggregate containing pit with infrared ray effect and potential hydraulic resistance. Mortar repair composition and And a method of repairing a concrete structure used.

The present invention relates to a lightweight inorganic binder comprising 5 to 75 wt% of a light inorganic binder, 10 to 80 wt% of fine aggregate, 0.01 to 20 wt% of a functional improver, and 0.01 to 25 wt% of water, 0.1 to 25% by weight of a vinyl acetate-vinyl chloride copolymer for improving adhesion and water resistance, and 0.1 to 50% by weight of an ethylene-fluoroethylene copolymer for improving strength, chemical resistance and the like. And 0.1 to 25% by weight of an ethylene-vinyl alcohol copolymer for improving the strength and durability of the concrete structural body.

Wherein the lightweight inorganic binder comprises 10 to 85% by weight of crude steel Portland cement, 5 to 55% by weight of blast furnace slag powder, 5 to 30% by weight of hollow silica, 1 to 20% by weight of anhydrous gypsum, 0.1 to 20% From 0.01 to 10% by weight of aluminate, from 0.01 to 10% by weight of magnesium, from 0.01 to 10% by weight of peat or peat, from 0.001 to 10% by weight of fibroferrite and from 0.001 to 10% have.

The light inorganic binder may further include 0.01 to 10% by weight of titanium oxide.

The light inorganic binder may further include 0.01 to 10 wt% of chromium oxide.

The fine aggregate may comprise 60 to 95% by weight of silica silica and 5 to 40% by weight of sericite.

The functional property-improving agent further comprises 0.01 to 5% by weight of a mixture of ethylene oxide and polyacrylic acid in a weight ratio of 0.05 to 0.8: 0.2 to 0.95 in order to impart a cohesive force and a material separation preventing property to form a stable concrete structure .

In addition, the functionality improver may further include 0.01 to 10% by weight of a styrene-methyl methacrylate copolymer.

In addition, the functional property improving agent may further include 0.01 to 10% by weight of polyvinylidene fluoride.

In addition, the functionality improving agent may further include 0.01 to 10% by weight of zirconium aluminate.

The present invention also relates to a method of manufacturing a concrete structure, comprising the steps of removing and cleaning impurities, laitance, and deteriorated portions of a concrete structure with a crusher, a hand water jet, a high-pressure water washing machine, etc., The method of claim 1, further comprising: applying a lightweight mortar repair material composition for repairing the concrete structure to the primer-treated upper portion, And coating a surface coating agent to prevent penetration of performance inhibiting factors such as chloride ion, carbon dioxide and the like, and finishing the concrete structure.

The primer treatment may use at least one material selected from styrene-butadiene latex (copolymer), polyacrylic ester, acrylic, ethyl vinyl acetate, methyl methacrylate and silane based compounds, The coating agent may be at least one selected from the group consisting of styrene-butadiene latex, polyacrylic ester, acrylic, ethylvinyl acetate, methyl methacrylate, and silica-silane compounds (condensation polymerization mixture).

The deteriorated portion may be removed to a lower portion of the reinforcing bar, and the exposed reinforcing bar may be rustproofed before the primer treatment.

According to the present invention, a lightweight inorganic binder having excellent acid resistance and salt resistance and a function improving agent having excellent flowability, toughness, adhesive strength, acid resistance, water resistance and durability can be used to improve the acid resistance, flame retardancy, flowability, toughness, adhesion, heat resistance, strength and durability Is greatly improved.

In addition, the use of lightweight inorganic binders and functionality improves strength and durability, especially in acid and salt resistance, to prevent corrosion of concrete due to chemical erosion of exponential structures, underground structures, marine concrete structures, chemical plant floors and sewer pipes. Therefore, the maintenance cost to be used can be remarkably reduced.

Further, by using a fine-grained material containing a far-infrared ray effect, a pozzolanic characteristic, and a lightweight siliceous silica sand and mica, it is excellent in light weight, heat insulation and strength, and excellent in durability against acidity and saltiness.

The lightweight mortar repairing composition for repairing a concrete structure of the present invention has excellent compressive strength, bending strength and adhesion strength, and can be easily applied not only to sewage facilities having many acidic substances but also to various existing structures repairing methods. It is possible to carry out mechanization work such as construction, so that it has many effects such as improvement of working efficiency and economical construction.

Hereinafter, preferred embodiments according to the present invention will be described in detail. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

The lightweight mortar repairing composition for repairing concrete structures according to the preferred embodiment of the present invention comprises 5 to 75% by weight of a light inorganic binder, 10 to 80% by weight of fine aggregate, 0.01 to 20% by weight of a functional improving agent and 0.01 to 25% do.

The environmentally friendly lightweight inorganic binder excellent in acid resistance and flame retardancy is selected from the group consisting of crude steel Portland cement, blast furnace slag powder, hollow silica, volcanic ash, anhydrous gypsum, tricalcium aluminate, magnesite, peat or peat, fibroferrite, . ≪ / RTI >

An environmentally friendly lightweight inorganic binder having excellent acid resistance and flame retardancy is 10 to 85% by weight of crude steel Portland cement, 5 to 55% by weight of blast furnace slag powder, 5 to 30% by weight of hollow silica, 1 to 20% by weight of anhydrous gypsum, 0.1 By weight of at least one member selected from the group consisting of alumina, alumina, zirconium oxide, zirconium oxide, zirconium oxide, zirconium oxide, zirconium oxide, 10% by weight.

Preferably, the crude steel portland cement uses cement in conformity with the KS standard. The crude steel portland cement is preferably contained in an amount of 15 to 85% by weight based on the weight of the inorganic binder.

The blast furnace slag powder is used for improving latent hydraulic characteristics, long-term strength development and durability. When the weight ratio of the blast furnace slag powder is increased, the early strength is lowered, but the long-term strength development and durability are increased. The blast furnace slag powder is preferably contained in the light inorganic binder in an amount of 5 to 55% by weight.

The hollow silica is used for improving pozzolanic characteristics, long-term strength development and durability. When the weight ratio of the hollow silica is increased, the early strength is lowered, but the long-term strength development and durability are increased. The hollow silica is preferably contained in an amount of 5 to 30% by weight based on the weight of the inorganic binder.

The anhydrous gypsum (CaSO ₄ ) reacts with the components in the cement, in particular C ₃ A ( ₃ CaO.Al ₂ O ₃ ), to initially produce ettringite (AFt phase, C ₃ A · ₃ CaSO ₄ · 32 H ₂ O) The produced etrinzate decreases in its amount as the hydration proceeds, or a part thereof is transferred to monosulfate (AFm phase, C ₃ A · CaSO ₄ · 12H ₂ O). When a large amount of anhydrous gypsum is added as in the present invention, etrinzite is sufficiently generated from the beginning to densify the structure of the cement, thereby increasing penetration resistance to chloride ions in the early age. In the case of general cement, etrinite is produced only at the initial stage. However, since the light inorganic binder of the present invention is sufficiently added with the amount of gypsum, the etlin zeite is present in a certain portion in the long- Rinseite is also produced continuously. The nitrite produced in this way increases the penetration resistance to chlorides even in the long term by densely filling the pores in the concrete structure. The anhydrous gypsum is preferably contained in an amount of 1 to 20% by weight based on the weight of the inorganic binder.

The above volcanic ash has a pozzolanic characteristic with a silica (SiO ₂ ) content of 75% or more and an Al ₂ O ₃ content of 10% or more, so that long-term strength development and durability enhancement can be obtained and at the same time, . When the weight ratio of the volcanic ash is increased, the early strength is lowered, but the long-term strength development, self-healing property and durability are increased. The above-described volcanic ash is preferably contained in an amount of 0.1 to 20% by weight based on the weight of the inorganic binder.

The tricalcium aluminate is used to improve initial strength development, chemical resistance, especially acid resistance. The tricalcium aluminate is preferably contained in an amount of 0.1 to 10 wt% with respect to the light inorganic binder. If the content of the tricalcium aluminate is less than 0.1% by weight, the effect of improving chemical resistance and acid resistance may be insignificant. If the content of the tricalcium aluminate is 10 If it is more than 10% by weight, good physical properties can be obtained due to fast curing properties, but it is not economical due to high manufacturing cost.

The magnesite can be used to improve fire resistance and wear resistance. The magnesite is preferably contained in an amount of 0.01 to 10 wt% with respect to the light inorganic binder. If the content of the magnesite is less than 0.01% by weight, the performance improvement effect may be lowered. If the content of the magnesite exceeds 10% by weight, the performance improvement effect is excellent, but the loss of workability is increased and the manufacturing cost is increased, .

The peat or peat acts as a sorbent material. The peat or peat is preferably contained in an amount of 0.01 to 10 wt% with respect to the light inorganic binder. If the content of the peat or peat is less than 0.01% by weight, the effect of improving the viscosity may be insignificant. If the content of the peat or peat is more than 10% by weight The workability is lowered and the manufacturing cost is increased, which is not economical.

The fibrin perlite is used for improving the light weight and flame retardancy of the composition. The content of the fibrin perlite is preferably 0.001 to 10 wt% with respect to the light inorganic binder. When the content of the fibrin perlite is less than 0.001% by weight, the effect of lightening and improving the flame retardancy may be insignificant. When the content of the fibrin peroxide exceeds 10% by weight, workability and strength are lowered, I can not.

The retarder is used for delaying rapid curing in order to ensure workability for a certain period of time, and it is preferable that the retarder is contained in an amount of 0.001 to 10 wt% with respect to the light inorganic binder. Examples of the delaying agent include generally known substances such as glucose, glucose, a sugar such as dextran, glucuronic acid, malic acid, citric acid, an acid such as citric acid or a salt thereof, an aminocarboxylic acid, A salt thereof, a phosphonic acid or a derivative thereof, and a polyhydric alcohol such as glycerin.

The light inorganic binder may further include titanium oxide. The titanium oxide can be used for antiseptic and antimicrobial functions. The titanium oxide is preferably contained in an amount of 0.01 to 10 wt% with respect to the light inorganic binder. When the weight ratio of the titanium oxide is increased, the antifouling performance is exhibited. When the content of the titanium oxide is less than 0.01 wt%, the effect of preservation, antibacterial and antifouling performance may be weak. When the content of the titanium oxide is more than 10 wt% Is not economical because the intensity is lowered and the manufacturing cost is increased.

The light inorganic binder may further include chromium oxide. The chromium oxide can be used to improve abrasion resistance and fire resistance. The chromium oxide is preferably contained in an amount of 0.01 to 10 wt% with respect to the light inorganic binder. If the content of the chromium oxide is less than 0.01% by weight, the performance effect may be insufficient. If the content of the chromium oxide exceeds 10% by weight, the strength development is decreased and the manufacturing cost is increased.

The light inorganic binder may further include a fluidizing agent. The fluidizing agent is used to improve the strength and durability by reducing the water-cement ratio of the light inorganic binder. The fluidizing agent may be a polycarbonate-based, melamine-based or naphthalene-based fluidizing agent. The melamine-based or naphthalene-based fluidizing agent is less effective in improving the strength and durability than the polycarbonate-based fluidizing agent, has a small effect of reducing the water-cement ratio, and has a poor compatibility when mixing with a function improver There is a disadvantage. Therefore, the fluidizing agent is preferably a polycarboxylic acid-based fluidizing agent and is preferably contained in an amount of 0.01 to 5% by weight based on the weight of the inorganic binder.

The fine aggregate may comprise silica silica and sericite. The fine aggregate preferably comprises 60 to 95% by weight of silica silica and 5 to 40% by weight of sericite. Disinfection, deodorization, heat insulation and strength, and excellent durability against acidity, salt and the like by using a fine aggregate containing mica and silica silica sand having a far infrared ray effect and an adsorption effect.

It is preferable that the silica silica has a particle size of from 4 to 8 (0.05 to 2.0 mm). If the particle size of the silica silicate silica is larger than this range, the fluidity of the lightweight mortar repairing composition for repairing concrete structures may be lowered. If the particle size is smaller than that, the workability of the lightweight mortar repairing composition for repairing concrete structures may deteriorate. The silica silicate is preferably contained in an amount of 60 to 95% by weight based on the fine aggregate.

The sericite is an aggregate that emits far-infrared rays. It is used to enhance the bioactivity effect of far infrared rays emitted from a lightweight mortar repair material composition for repairing concrete structures, and to obtain adsorption, disinfection and deodorization effects. It is preferable that the sericite is contained in an amount of 5 to 40% by weight based on the fine aggregate.

The functional modifier is used to improve the pot life, workability, toughness, fluidity, strength, adhesive strength, acid resistance, water resistance and durability. It is a styrene-vinyl acetate copolymer for improving strength and adhesion, An ethylene-fluoroethylene copolymer for improving the strength, chemical resistance and the like, and an ethylene-vinyl alcohol copolymer for improving the strength and durability.

Wherein the functionality improver is selected from the group consisting of 50-99 wt% styrene-vinyl acetate copolymer, 0.1-25 wt% vinyl acetate-vinyl chloride copolymer, 0.1-25 wt% ethylene-fluoroethylene copolymer, 25% by weight.

The functionality improving agent is preferably contained in an amount of 0.01 to 20% by weight based on the lightweight mortar repair material composition for repairing a concrete structure. If the content of the function improver exceeds 20% by weight, the viscosity tends to be lowered and the material separation tends to occur, and the hydration reaction may be delayed to lower the early compression strength and lower the price competitiveness. If the content of the functional agent is less than 0.01% by weight, the effect of improving the working time, workability, toughness, fluidity, strength, adhesive strength, acid resistance, water resistance and durability may be small.

The styrene-vinyl acetate copolymer is used to improve strength and adhesion. If the content of the styrene-vinyl acetate copolymer is less than 50% by weight, it is preferable that the styrene-vinyl acetate copolymer has an effect of improving bonding strength, adhesion strength and durability between inorganic materials And when the content of the styrene-vinyl acetate copolymer exceeds 98% by weight, it is difficult to expect further improvement in adhesion and durability.

The vinyl acetate-vinyl chloride copolymer is used to improve the adhesive strength and water resistance. It is preferable that the vinyl acetate-vinyl chloride copolymer is contained in an amount of 0.1 to 25% by weight based on the functional agent. When the content of the vinyl acetate-vinyl chloride copolymer exceeds 25% by weight, the lightweight mortar repair material composition But if the content of the vinyl acetate-vinyl chloride copolymer is less than 0.1% by weight, the workability of the lightweight mortar repairing composition for repairing concrete structures may be improved but the effect of improving the adhesion and heat resistance may be weak have.

The ethylene-fluoroethylene copolymer is used to improve strength, chemical resistance, and the like. In addition, the ethylene-fluoroethylene copolymer is excellent in acid resistance and alkali resistance and has an effect of improving strength. It is preferable that the ethylene-fluoroethylene copolymer is contained in an amount of 0.1 to 25% by weight based on the functionality improving agent. If the content of the ethylene-fluoroethylene copolymer exceeds 25% by weight, the performance may be improved, If the content of the ethylene-fluoroethylene copolymer is less than 0.1% by weight, the effect of improving the acid resistance and strength may be insignificant.

The ethylene-vinyl alcohol copolymer is used to improve the strength and durability of a lightweight mortar repair material composition for repairing concrete structures. It is preferable that the ethylene-vinyl alcohol copolymer is incorporated in an amount of 0.1 to 25% by weight based on the functionality improving agent. If the content of the ethylene-vinyl alcohol copolymer exceeds 25% by weight, the performance may be improved, If the content of the ethylene-vinyl alcohol copolymer is less than 0.1% by weight, the effect of improving the strength and durability may be weak.

The functionality improver may further comprise a mixture of ethylene oxide and polyacrylic acid. The mixture of ethylene oxide and polyacrylic acid may contribute to formation of a stable concrete structure by imparting fluidity, cohesive force and material separation prevention property. In addition, by the excellent cohesive force, it is possible to prevent collision of water and protection of reinforcement of concrete structure Can be achieved. The mixture of ethylene oxide and polyacrylic acid is preferably contained in an amount of 0.01 to 5% by weight based on the functional agent. If the content of the mixture of ethylene oxide and polyacrylic acid exceeds 5% by weight, the viscosity of the lightweight mortar repairing composition for repairing concrete structures may increase and the workability may be deteriorated. When the content of the ethylene oxide and polyacrylic acid is less than 0.1 wt% %, The workability of the lightweight mortar repair material composition for repairing concrete structures is improved, but the effect of imparting fluidity, cohesive force and material separation prevention property may be weak. The mixture of ethylene oxide and polyacrylic acid is preferably a mixture of ethylene oxide and polyacrylic acid in a weight ratio of 0.05 to 0.8: 0.2 to 0.95 in order to form a stable concrete structure by imparting cohesive force and material separation prevention property Do.

In addition, the functionality improving agent may further include a styrene-methyl methacrylate copolymer. The styrene-methyl methacrylate copolymer is used for improving the strength and durability as well as maintaining the workability by lowering the viscosity of the lightweight mortar repair material composition for repairing concrete structures. In addition, the styrene-methyl methacrylate copolymer is excellent in alkali resistance and has an effect of improving strength. The styrene-methyl methacrylate copolymer is preferably contained in an amount of 0.01 to 10% by weight based on the functionality improving agent. If the content of the styrene-methyl methacrylate copolymer exceeds 10% by weight, the lightweight mortar for repairing concrete structures If the content of the styrene-methyl methacrylate copolymer is less than 0.01% by weight, the workability of the lightweight mortar repairing composition for repairing the concrete structure is improved but the alkali resistance and the water retention improving effect May be weak.

The functional property improving agent may further include polyvinylidene fluoride. The polyvinylidene fluoride is used to improve the adhesion, durability and heat resistance of the lightweight mortar repair composition for repairing concrete structures. The polyvinylidene fluoride is preferably contained in an amount of 0.01 to 10 wt% based on the functional agent. If the content of the polyvinylidene fluoride exceeds 10 wt%, the performance is improved. If the content of the polyvinylidene fluoride is less than 0.01% by weight, the workability is improved but the effect of improving the adhesion, durability and heat resistance may be weak.

In addition, the functionality improving agent may further include 0.01 to 10% by weight of zirconium aluminate.

In addition, the functionality improving agent may further include a zirconia aluminate. The zirconyl aluminate is used for improving the salt resistance, moisture resistance and durability. It is preferable that the zirconium aluminate is contained in an amount of 0.01 to 10 wt% with respect to the functionality improving agent. If the content of the zirconium aluminate exceeds 10 wt%, the performance may be improved but price competitiveness may be deteriorated. If the content of aluminate is less than 0.01% by weight, the workability is improved but the effect of improving the salt resistance, moisture resistance and durability may be weak.

In addition, the function improving agent may further include a defoaming agent for removing bubbles in the functional improving agent to increase strength and durability. The antifoaming agent is used to remove bubbles in the functional property improving agent to increase strength and durability. Further, when the antifoaming agent is added to the functional property improving agent, air entraining effect can be imparted to improve workability and pot life. The antifoaming agent is preferably contained in an amount of 0.01 to 10% by weight based on the functional agent. Examples of the defoaming agent include alcohol defoaming agents, silicone defoaming agents, fatty acid defoaming agents, oil defoaming agents, ester defoaming agents and oxyalkylene defoaming agents. Examples of the silicone defoaming agent include dimethyl silicone oil, polyorganosiloxane, and fluorosilicone oil. Examples of the fatty acid defoaming agent include stearic acid and oleic acid. Examples of the oil-based antifoaming agents include kerosene, animal and plant oil, and castor oil. Examples of the ester type antifoaming agents include solitol trioleate, glycerol monoricinolate, and the like. Examples of the oxyalkylene antifoaming agents include polyoxyalkylene, acetylene ethers, polyoxyalkylene diisocyanate esters, and polyoxyalkylene alkylamines. Examples of the alcohol-based defoaming agent include glycol.

In addition, the functionality improving agent may further include a water reducing agent for reducing the water-cement ratio to improve strength and durability. The water reducing agent is used to improve the strength and durability by decreasing the water-cement ratio and to secure the fluidity of the function improver. The water-cement ratio is reduced when the water reducing agent is added to the functionality improving agent. The water reducing agent is preferably contained in an amount of 0.01 to 10% by weight with respect to the functionality improving agent. The water reducing agent may be a polycarbonate-based, melamine-based or naphthalene-based water reducing agent. However, the naphthalene-based and melamine-based compounds may lower the strength of the composition as compared with the polycarbonate-based ones and may reduce workability and pot life, And a polycarboxylic acid-based water reducing agent which does not lower the pot life.

Hereinafter, a method for manufacturing a lightweight mortar repair material composition for repairing a concrete structure according to a preferred embodiment of the present invention will be described.

The lightweight mortar repairing composition for repairing concrete structures according to a preferred embodiment of the present invention comprises 5 to 75% by weight of the light inorganic binder, 10 to 80% by weight of fine aggregate, and 0.01 to 20% Mixing the mixture with water, adding 0.01 to 25% by weight of water, and mixing the mixture with a forced mixer or a continuous mixer for a predetermined time (for example, 1 to 10 minutes).

Hereinafter, a method of repairing a concrete structure using the lightweight mortar repair material composition for repairing concrete structures will be described. Hereinafter, the concrete structure refers to structures such as an underground structure, an exponential structure, a marine concrete structure, an underwater concrete structure, a sewer pipe, a road surface, a bridge bridge, a concrete slab of a bridge, , Housing floor, etc., are used to mean a structure made of concrete.

A method of repairing a concrete structure according to a preferred embodiment of the present invention includes the steps of removing and cleaning impurities, laitance, and deteriorated portions of a concrete structure by a crusher, a hand water jet, a high-pressure water washing machine, A step of priming the untreated and grooved portions with a putty, a step of primer treating the treated portion, a step of repairing the section by placing the lightweight mortar repairing composition for repairing the concrete structure on the primer treated upper portion, The surface of the recovered product is finished and a surface coating agent is applied and finishing treatment is performed to prevent penetration of performance inhibiting factors such as water, chlorine ion, and carbon dioxide.

The deteriorated portion may be removed to a lower portion of the reinforcing bar, and the exposed reinforcing bar may be rustproofed before the primer treatment. When the crusher, the hand water jet, and the high-pressure water washing machine are used, the reinforcing bars of the concrete structure are not exposed in the normal case but the reinforcing bars may be exposed in the deteriorated areas when the deterioration is severe. It is desirable to prevent corrosion of the reinforcing bars.

Hereinafter, the primer treatment refers to application of a material that facilitates adhesion of the lightweight mortar repair composition for repairing concrete structures to a concrete structure. The primer treatment may be performed using at least one material selected from styrene-butadiene latex, polyacrylic ester, acrylic, ethyl vinyl acetate and methyl methacrylate, but is not limited thereto.

The surface coating agent may be at least one selected from styrene-butadiene latex (copolymer), polyacrylic ester, acryl, ethylvinyl acetate, methyl methacrylate and silica-silane compounds Materials may be used, but are not limited thereto.

Hereinafter, embodiments of the lightweight mortar repair material composition for repairing a concrete structure according to the present invention will be more specifically shown, and the present invention is not limited by the following embodiments.

≪ Example 1 >

45 wt% of a light inorganic binder, 45 wt% of a fine aggregate, and 4 wt% of a function improver were premixed in a vacuum type forced mixer. Then, 6 wt% of water was added and the mixture was stirred with a forced mixer for 2 minutes to prepare a lightweight mortar A repellent composition was prepared.

At this time, the lightweight inorganic binder was composed of 46 wt% crude steel portland cement, 20 wt% blast furnace slag powder, 10 wt% hollow silica, 5 wt% volcanic ash, 5 wt% anhydrous gypsum, 5 wt% tricalcium aluminate, 2% by weight of peat or peat, 2% by weight of fibrin glue, 1% by weight of retarder, 1% by weight of titanium oxide, 0.5% by weight of chromium oxide and 0.5% by weight of a fluidizing agent. As the retarder, citric acid was used. The fluidizing agent used was a polycarboxylic acid-based fluidizing agent.

The fine aggregate used was a mixture of 90% by weight of silica silica and 10% by weight of sericite.

The functionality improver may be selected from the group consisting of 91 wt% styrene-vinyl acetate copolymer, 2 wt% vinyl acetate-vinyl chloride copolymer, 1 wt% ethylene-fluoroethylene copolymer, 1 wt% ethylene-vinyl alcohol copolymer, 1% by weight of an acrylic acid mixture, 1% by weight of a styrene-methyl methacrylate copolymer, 1% by weight of polyvinylidene fluoride, 1% by weight of zirconium aluminate, 0.5% by weight of a defoaming agent and 0.5% by weight of a water reducing agent . The mixture of ethylene oxide and polyacrylic acid in a ratio of 0.1: 0.9 by weight was used. The defoamer was a silicone defoamer. A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

≪ Example 2 >

45 wt% of a light inorganic binder, 45 wt% of a fine aggregate, and 4 wt% of a function improver were premixed in a vacuum type forced mixer. Then, 6 wt% of water was added and the mixture was stirred with a forced mixer for 2 minutes to prepare a lightweight mortar A repellent composition was prepared.

At this time, the lightweight inorganic binder was composed of 46 wt% crude steel portland cement, 20 wt% blast furnace slag powder, 10 wt% hollow silica, 5 wt% volcanic ash, 5 wt% anhydrous gypsum, 5 wt% tricalcium aluminate, 2% by weight of peat or peat, 2% by weight of fibrin glue, 1% by weight of retarder, 1% by weight of titanium oxide, 0.5% by weight of chromium oxide and 0.5% by weight of a fluidizing agent. As the retarder, citric acid was used. The fluidizing agent used was a polycarboxylic acid-based fluidizing agent.

The fine aggregate used was a mixture of 90% by weight of silica silica and 10% by weight of sericite.

The functionality improver may be selected from the group consisting of 84 wt% styrene-vinyl acetate copolymer, 3 wt% vinyl acetate-vinyl chloride copolymer, 2 wt% ethylene-fluoro ethylene copolymer, 2 wt% ethylene-vinyl alcohol copolymer, A mixture of 2% by weight of an acrylic acid mixture, 2% by weight of a styrene-methyl methacrylate copolymer, 2% by weight of polyvinylidene fluoride, 2% by weight of zirconia aluminate, 0.5% by weight of a defoaming agent and 0.5% by weight of a water reducing agent . The mixture of ethylene oxide and polyacrylic acid in a ratio of 0.1: 0.9 by weight was used. The defoamer was a silicone defoamer. A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

≪ Example 3 >

45 wt% of a light inorganic binder, 45 wt% of a fine aggregate, and 4 wt% of a function improver were premixed in a vacuum type forced mixer. Then, 6 wt% of water was added and the mixture was stirred with a forced mixer for 2 minutes to prepare a lightweight mortar A repellent composition was prepared.

At this time, the lightweight inorganic binder was composed of 46 wt% crude steel portland cement, 20 wt% blast furnace slag powder, 10 wt% hollow silica, 5 wt% volcanic ash, 5 wt% anhydrous gypsum, 5 wt% tricalcium aluminate, , 2% by weight of peat, 2% by weight of fibrin glue, 1% by weight of retardation, 1% by weight of titanium oxide, 0.5% by weight of chromium oxide and 0.5% by weight of a fluidizing agent. As the retarder, citric acid was used. The fluidizing agent used was a polycarboxylic acid-based fluidizing agent.

The fine aggregate used was a mixture of 90% by weight of silica silica and 10% by weight of sericite.

The functional property-improving agent is a copolymer of styrene-vinyl acetate copolymer, styrene-vinyl acetate copolymer, vinyl acetate-vinyl chloride copolymer, ethylene-fluoroethylene copolymer, ethylene-vinyl alcohol copolymer, ethylene oxide and poly 3% by weight of an acrylic acid mixture, 3% by weight of a styrene-methyl methacrylate copolymer, 3% by weight of polyvinylidene fluoride, 3% by weight of zirconium aluminate, 0.5% by weight of a defoaming agent and 0.5% by weight of a water reducing agent . The mixture of ethylene oxide and polyacrylic acid in a ratio of 0.1: 0.9 by weight was used. The defoamer was a silicone defoamer. A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

Comparative Examples which can be compared with the embodiments of the present invention are shown in order to more easily grasp the characteristics of Examples 1 to 3. Comparative Examples 1 and 2 to be described later are examples of the common cement A mortar composition and a polymer-cement mortar composition.

≪ Comparative Example 1 &

45% by weight of ordinary Portland cement, 45% by weight of fine aggregate and 10% by weight of water were mixed with a forced mixer to prepare a usual cement mortar composition. Silica silicate was used as the fine aggregate.

≪ Comparative Example 2 &

45% by weight of Portland cement, 45% by weight of fine aggregate and 4% by weight of styrene-vinyl acetate were preliminarily mixed with a vacuum type forced mixer, 6% by weight of water was added and stirred with a forced mixer for 2 minutes to prepare a polymer cement mortar composition . Silica silicate was used as the fine aggregate.

The following test examples show experimental results in which the characteristics according to the present invention are compared with the characteristics of Comparative Example 1 and Comparative Example 2 in order to more easily grasp the characteristics of Examples 1 to 3 according to the present invention .

≪ Test Example 1 >

In order to compare the physical properties of the lightweight mortar repair composition for repairing concrete structures prepared according to Examples 1 to 3 and the cement mortar composition prepared in Comparative Examples, The lightweight mortar repair composition for repairing concrete structures and the cement mortar composition prepared by Comparative Example 1 and Comparative Example 2 were subjected to compression, flexure and adhesion strength tests by KS F 4042 (polymer cement mortar for repairing concrete structures) The results are shown in Table 1 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 1 burglar
(kgf / cm2) warp 110 119 129 58 100 compression 534 556 578 505 511 Attach Standard condition 22 22.5 24 14.5 20.5 After warm-cold repeat 21.5 22.1 23.5 13.5 19.0

As shown in Table 1, the warpage, compression, and adhesion strength of the lightweight mortar repairing composition for repairing concrete structures prepared according to Examples 1 to 3 were evaluated by using the cement mortar composition prepared in Comparative Example 1 and Comparative Example 2 Respectively.

It was confirmed that the lightweight mortar repairing composition for repairing concrete structures according to Examples 1 to 3 was much superior in strength to the cement mortar composition prepared in Comparative Examples.

≪ Test Example 2 &

The lightweight mortar repair composition for repairing concrete structures prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were treated with KS F 4042 (polymer cement mortar for repairing concrete structures) The rate of change was measured and the results are shown in Table 2 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Length change rate (%) 0.035 0.025 0.016 0.105 0.075

As shown in Table 2 above, the lightweight mortar repairing composition for repairing concrete structures prepared according to Examples 1 to 3 was reduced in shrinkage amount of shrinkage as compared with the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2, It can be confirmed that there is a reduction effect.

≪ Test Example 3 >

The lightweight mortar repairing composition for repairing concrete structures prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were specified in KS F 4042 (polymer cement mortar for repairing concrete structures) The results of the measurement of the permeability according to the method are shown in Table 3 below. If the amount of water permeates, if the impurities or water penetrate into the interior of the concrete, the porosity increases in the interior of the concrete, thereby causing a problem of causing damage to the structure.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Permeability (g) 2.0 1.5 1.3 15.2 2.5

As shown in Table 3, the lightweight mortar repairing composition for repairing concrete structures manufactured according to Examples 1 to 3 had a lower water permeation amount than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2.

<Test Example 4>

The lightweight mortar repairing composition for repairing concrete structures prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Examples 1 and 2 were applied to KS F 4042 (Polymer Cement Mortar for Repairing Concrete Structures) Ion penetration resistance test was performed, and the results are shown in Table 4 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Chloride ion penetration resistance (Coulombs) 800 781 745 2,000 950

As shown in Table 4 above, the lightweight mortar repairing composition for repairing concrete structures according to Examples 1 to 3 had less resistance to chloride ion penetration than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 And it was confirmed that it is highly resistant to salt attack.

&Lt; Test Example 5 >

The lightweight mortar repairing composition for repairing concrete structures prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were neutralized by KS F 4042 (polymer cement mortar for repairing concrete structures) The results are shown in Table 5 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Neutralization resistance (mm) 0.35 0.2 0.1 1.6 0.6

As shown in Table 5, the lightweight mortar repairing composition for repairing concrete structures according to Examples 1 to 3 had a smaller neutralization penetration depth than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 It was confirmed that the resistance to neutralization was high.

&Lt; Test Example 6 >

The lightweight mortar repairing composition for repairing concrete structures prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were evaluated according to the Japanese Industrial Standard specification [Test Method for Chemical Resistance by Immersion in Concrete Solution ], The aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide was immersed in the test solution for 28 days, and the measurement results of the chemical resistance test are shown in Table 6 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Weight change rate
(%) Hydrochloric acid -1.0 -0.8 -0.5 -8.9 -1.8 Sulfuric acid 0 0 0 -1.7 -0.5 Sodium hydroxide +0.5 +1.0 +1.1 -0.25 +0.25

As shown in Table 6 above, the lightweight mortar repairing composition for repairing concrete structures produced according to Examples 1 to 3 exhibited a weight change rate with respect to chemical resistance as compared with the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 And the resistance to chemical resistance was high.

&Lt; Test Example 7 >

The lightweight mortar repairing composition for repairing concrete structures prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were measured for the freeze-thaw resistance test according to the method specified in KS F 2456 The results are shown in Table 7 below. Freezing and thawing means that the water absorbed in the capillary is frozen and melted in the concrete. If the freezing and thawing is repeated, fine cracks are generated in the concrete structure and the durability is lowered. Table 7 shows the durability indexes of the respective examples and comparative examples according to the freeze-thaw resistance test.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Durability index 91.5 92.5 93 67.5 89.5

As shown in Table 7, the durability index of the lightweight mortar repairing composition for repairing concrete structures according to Examples 1 to 3 is much higher than that of the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 , And the durability is improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.

Claims (10)

A lightweight mortar repair material composition for repairing concrete structures,
5 to 75 wt% of a light inorganic binder, 10 to 80 wt% of a fine aggregate, 0.01 to 20 wt% of a functional improver, and 0.01 to 25 wt%
Wherein the functional property improving agent is at least one selected from the group consisting of 50 to 99% by weight of a styrene-vinyl acetate copolymer, 0.1 to 25% by weight of a vinyl acetate-vinyl chloride copolymer, 0.1 to 25% by weight of an ethylene-fluoroethylene copolymer, To 25% by weight of a mixture of ethylene oxide and polyacrylic acid in a weight ratio of 0.05 to 0.8: 0.2 to 0.95 in order to form a stable concrete structure by imparting cohesive force and material separation prevention property, % Of styrene-methyl methacrylate copolymer, 0.01 to 10% by weight of styrene-methyl methacrylate copolymer, 0.01 to 10% by weight of polyvinylidene fluoride, and 0.01 to 10% by weight of zirconium aluminate,
Wherein the lightweight inorganic binder comprises 10 to 85% by weight of crude steel Portland cement, 5 to 55% by weight of blast furnace slag powder, 5 to 30% by weight of hollow silica, 1 to 20% by weight of anhydrous gypsum, 0.1 to 20% From 0.01 to 10 wt% of aluminate, from 0.01 to 10 wt% of magnesite, from 0.01 to 10 wt% of peat or peat, from 0.001 to 10 wt% of fibroferrite and from 0.001 to 10 wt% of retarder, Further comprising 0.01 to 10% by weight of titanium oxide and 0.01 to 10% by weight of chromium oxide,
Wherein the fine aggregate comprises 60 to 95% by weight of silica silica and 5 to 40% by weight of sericite,
Wherein the mortar made from the composition has a compressive strength of 534 to 578 kgf / cm 2 and a flexural strength of 110 to 129 kgf / cm 2.
delete delete delete delete delete delete delete A method of repairing a concrete structure using the lightweight mortar repairing composition for repairing a concrete structure according to claim 1,
A preparatory step of cleaning the impurity, the latent or the deteriorated part of the concrete structure, treating the cleaved part with cracks, irregularities or grooves, and priming the pretreated part,
A step of restoring a section by placing the lightweight mortar repair material composition for repairing the concrete structure on the primer-treated upper part, and
Applying a surface coating agent to finish the surface of the recovered section and to prevent penetration of the performance inhibiting element into the concrete structure, and finishing
Wherein the method comprises the steps of:
10. The method of claim 9,
The primer treatment uses at least one selected from styrene-butadiene latex, polyacrylic ester, acrylic, ethyl vinyl acetate, methyl methacrylate and silane compounds as a primer,
The surface coating agent may be at least one selected from the group consisting of styrene-butadiene latex (copolymer), polyacrylic ester, acrylic, ethylvinyl acetate, methyl methacrylate and silica- Wherein the repairing step includes the step of repairing the concrete structure.