KR101446239B1 - Cement mortar composition having excellent durability, organic sewage inhibition and deodorization function, and method for repairing concrete structure using the composition - Google Patents

Abstract

The present invention relates to a cement mortar composition and a method for repairing a concrete structure using the same, wherein the cement mortar composition includes: 10-79 wt% of an inorganic-based binder, 20-80 wt% of a fine aggregate, 0.01-20 wt% of a durability improver, and 0.1-20 wt% of water. The durability improver includes 45-99 wt% of polyurethane, 0.1-15 wt% of phthalate, 0.1-15 wt% of polyol, 0.01-15 wt% of polyoxypropylenediamine, 0.01-15 wt% of methylenediphenyldiisocyanate, and 0.01-15 wt% of acetyl peroxide. According to the present invention, the cement mortar composition has strength, fluidity, elasticity, adhesive forces, watertightness, antiseptic properties, antistaining properties, deodorizing properties, neutralization resistance, salt resistance, acid resistance, wear resistance, fire resistance, and durability. In particular, the composition has excellent antiseptic properties, antistaining properties, salt resistance, acid resistance, and watertightness, so that the corrosion of concrete can be prevented, wherein the corrosion is caused by the chemical erosion of a concrete structure, a precast product, a sewer, a sewage pipe, a sewage culvert, an underground structure, and a water conduction tunnel under a bad environment, wherein the concrete structure includes a concrete structure, such as a sewage terminal disposal plant structure, a water concrete structure, and a hydraulic structure (an agricultural waterway, a water bridge, and a water gate structure). Also, the cement mortar composition has functions in controlling the corrosion of water flowing on a concrete structure and in removing smells, so that rivers can be prevented from being polluted and the water treatment abilities of a sewage terminal disposal plant structure can be improved. Accordingly, maintenance costs for a concrete structure can be remarkably reduced.

Description

TECHNICAL FIELD The present invention relates to a cement mortar composition having excellent durability and a method of repairing a concrete structure using the cement mortar composition and an organic sewage inhibiting and deodorizing function,

The present invention relates to a cement mortar composition excellent in durability and capable of preventing anaerobic decomposition of sewage, stormwater, and wastewater, and a method of repairing a concrete structure using the cement mortar composition. More particularly, the present invention relates to a cement mortar composition having excellent strength, fluidity, , Water resistance, salt resistance, acid resistance, abrasion resistance, fire resistance and durability, especially antiseptic property, antifouling property, salt resistance property, acid resistance and watertightness, so that a sewage terminal treatment plant structure, an underwater concrete structure, a hydraulic structure Concrete structures and precast products under harsh environments such as floodgates, floodgates, and hydrological structures), corrosion of concrete due to chemical erosion of sewer pipes, sewage culverts, underground structures, canal tunnels, etc., To prevent pollution of rivers and to improve the water treatment capacity of the sewage treatment plant. It can be achieved, and relates to a method of repairing concrete structures Concrete structures maintenance costs cement mortar composition which can significantly reduce and using it in.

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 the concrete structure is corroded by the sulfite of the reinforced concrete structure related to the end-of-sewage treatment. Structures subject to chemical corrosion include structures related to stormwater and sewage-related structures, chemical plants, water purification facilities, drainage systems, agricultural waterways, watercraft, and water gates, soil pollution and water purification plants, underground structures of sewage treatment plants, sewage- .

Conventional concrete structures such as sewage pipes and sewer pipes are made by mixing cement, water, and gravel or sand. The domestic sewage and industrial wastewater in a large city flows to the final destination sewage treatment plant after about 1 to 5 km from the sewage pipe and the sewage pipe. In the case of storm water, the sewage is discharged to the river immediately after passing through the sewer pipe without any sewage treatment.

The stormwater and waste water pass through these structures and become anaerobic fermentation and become corrupted. As a result, the levels of BOD, COD and DO are increased, and various harmful gases such as ammonia, CO ₂ and SO ₂ are generated, and diseases such as pests, cockroaches, maggots, mosquitoes, . As a result, the quality of the water reaching its final destination is further aggravated, leading to an increase in the cost of purification and a source of water pollution in natural streams. Concrete structures made by mixing cement, water and other materials such as gravel or sand include cisterns, manholes, agricultural water pipes, concrete hume pipes, and revetment blocks in addition to sewer pipes or sewer pipes. These concrete structures, There is a problem that metals such as reinforcing bars, wires, and steel wires used as reinforcing materials are neutralized and the inside moisture of the closed space promotes neutralization of concrete due to poisonous gas and the like, and the use life of the structure is shortened.

Korea Patent Registration No. 10-1340856

SUMMARY OF THE INVENTION The object of the present invention is to provide an antifouling coating composition which is excellent in strength, fluidity, elasticity, adhesion, watertightness, antifouling property, antifouling property, deodorant property, neutralization resistance property, salt resistance property, acid resistance property, abrasion resistance property, , And chemical erosion of concrete structures and precast products, sewage pipes, sewage culverts, underground structures and canal tunnels under harsh environments such as sewage terminal treatment plant structures, underwater concrete structures, hydraulic structures (agricultural waterways, It is possible to prevent the corrosion of the concrete caused by the concrete structure and to prevent the contamination of the stream and the deodorization performance of the water flowing in the concrete structure and to improve the water treatment ability of the sewage water treatment plant, Cement mortar composition and method for repairing concrete structure using the same .

The durability improving agent comprises 10 to 79% by weight of an inorganic binder, 20 to 80% by weight of a fine aggregate, 0.01 to 20% by weight of a durability improving agent, and 0.1 to 20% by weight of water, 0.1 to 15 wt% of phthalate, 0.1 to 15 wt% of polyol, 0.01 to 15 wt% of polyoxypropylene diamine, 0.01 to 15 wt% of methylene diphenyl diisocyanate, and 0.01 to 15 wt% of acetyl peroxide, The inorganic binder is usually 5 to 70% by weight of Portland cement, 5 to 45% by weight of blast furnace slag powder, 5 to 20% by weight of waste activated carbon, 1 to 15% by weight of aluminum hydroxide, 1 to 20% by weight of anhydrous gypsum, 0.1 to 10% by weight of zirconium powder, 0.01 to 10% by weight of zinc oxide, 0.01 to 10% by weight of shellfish shell and 0.01 to 10% by weight of aluminum sulfate, 99 to 99% by weight, dolomite 0.1 to 35% by weight and yellow soil 0.1 to 25% ≪ RTI ID = 0.0 > cement < / RTI >

The endurance performance improving agent may further include 0.01 to 15% by weight of fluorine.

The endurance performance improving agent may further include 0.01 to 15% by weight of silane resin.

The endurance performance improving agent may further include 0.01 to 15% by weight of silicon.

The endurance performance improving agent may further comprise 0.01 to 5% by weight of at least one material selected from polyoxyethylene, polypropylene glycol and polyethylene glycol.

The phthalate may include at least one material selected from the group consisting of polytrimethylene terephthalate, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, diallyl phthalate and diallyl isophthalate.

The polyol may be at least one material selected from sorbitol, glycerol, polyethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, hexylene glycol, 1,4-butanediol and 1,2,6- . ≪ / RTI >

According to the present invention, there is also provided a method of manufacturing a reinforced concrete structure, comprising the steps of: removing impurities, run-ins, or deteriorated portions of a concrete structure; priming the exposed portions and rust-proofing the exposed reinforcing bars; A step of repairing the cross section by installing the cement mortar composition, and a step of finishing the surface finishing of the restored resultant and applying a surface protective agent.

The primer treatment may use at least one selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, methyl methacrylate, silane-based compounds and the endurance improving agents.

The surface protective agent may be at least one selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, methyl methacrylate, silane-based compounds and the endurance improving agents.

INDUSTRIAL APPLICABILITY The cement mortar composition of the present invention is excellent in durability performance improving agents excellent in strength, durability, deodorization, anticorrosion, salt resistance and acid resistance, and excellent in adhesion, antifouling property, neutralization resistance, durability and watertightness, Strength, fluidity, elasticity, adhesion, neutralization resistance, salt resistance, acid resistance, durability, abrasion resistance, fire resistance, antifouling, antifouling, deodorization and watertightness are greatly improved by using fine aggregates which are excellent in flame retardancy, durability, abrasion resistance, .

According to the cement mortar composition of the present invention, it is possible to provide a cement mortar composition which is excellent in strength and durability, especially in antifouling property, antifouling property, salt resistance, acid resistance and watertightness, It is possible to prevent corrosion of concrete caused by chemical erosion of cast products and the like, and it is possible to remarkably reduce the maintenance cost to be used.

Further, according to the present invention, it is possible to prevent the contamination of the river and the water treatment ability of the sewage water treatment plant due to the decaying and deodorizing performance of the water flowing through the concrete structure.

Further, according to the present invention, since it has excellent compressive strength, bending strength and adhesion strength, it can be easily applied not only to a sewage facility having a large amount of acidic substances, a concrete index structure in contact with water but also to various existing methods, It is possible to mechanize construction such as construction and the like, so that it has many effects such as improvement of work 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 cement mortar composition according to a preferred embodiment of the present invention comprises 10 to 79% by weight of an inorganic binder, 20 to 80% by weight of a fine aggregate, 0.01 to 20% by weight of a durability improving agent and 0.1 to 20% by weight of water. The cement mortar composition according to the preferred embodiment of the present invention is excellent in strength, fluidity, elasticity, adhesion, water tightness, antifouling property, antifouling property, deodorizing property, neutralization resistance, salt resistance, acid resistance, abrasion resistance, fire resistance and durability, , Deodorizing property, salt resistance, acid resistance and watertightness.

The durability improving agent is preferably contained in the cement mortar composition in an amount of 0.01 to 20 wt%. If the content of the durability improving agent is more than 20% by weight, the viscosity is lowered and the material separation tends to occur, and the price competitiveness may be lowered. If the content of the durability improving agent is less than 0.01% by weight, the durability improvement effect may be insignificant.

The durability improver includes polyurethane for improving adhesion, strength and durability, phthalate for improving flexural toughness and ductility, polyol for improving ductility, polyoxypropylene diamine for improving elongation and tensile strength, curing time Methylene diphenyl diisocyanate for controlling the reaction, and acetyl peroxide for improving the reactivity. The endurance performance improving agent may be selected from the group consisting of 45-99 wt% polyurethane, 0.1-15 wt% phthalate, 0.1-15 wt% polyol, 0.01-15 wt% polyoxypropylene diamine, 0.01-15 wt% methylene diphenyl diisocyanate, And 0.01 to 15% by weight of an oxide. The endurance performance improving agent is excellent in adhesion, antifouling property, neutralization resistance, durability, water tightness and the like.

The polyurethane is used to improve adhesion, strength and durability. When the content of the polyurethane is less than 45% by weight, the effect of improving the bonding strength, adhesion strength, strength and durability of the inorganic materials may be insufficient. On the other hand, When the content of the polyurethane exceeds 99% by weight, it is difficult to expect further improvement in adhesion, strength and durability.

The phthalate is a plasticizer added as a plasticizer to improve flexural toughness and give flexibility, and is a polymer compound having an ester bond (CO-O-) in the molecule as a main base. Phthalates are compounds prepared by condensation polymerization of an alcohol having two or more valencies with a carboxylic acid having two or more valencies. Examples of the phthalate include polytrimethylene terephthalate, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, diallyl phthalate, diallyl isophthalate, and mixtures thereof. It is preferable that the phthalate is contained in the durability improving agent in an amount of 0.1 to 15% by weight. If the content of the phthalate exceeds 15 wt%, the bending and tensile strength are improved, but the material separation phenomenon easily occurs. If the content of the phthalate is less than 0.1 wt%, the material separation phenomenon is small, but the effect of improving the flexural toughness and ductility is weak can do.

The polyol serves to form a polymer having softness and is a raw material capable of forming a polymer compound having a urethane bond (-OCONH-) in a molecule. Examples of the polyol include sorbitol, glycerol, polyethylene glycol, propylene glycol, dipropylene glycol, 3-butylene glycol, hexylene glycol, 1,4-butanediol, 1,2,6-hexatriol, mixtures thereof and the like. Polyol is a rubber-like elastic material and is widely used in making urethane rubber, synthetic fibers, adhesives, paints, urethane foams and automobile bumpers. As the diol, polyether diols such as polyethylene glycol and polypropylene glycol and aliphatic polyesters of terminal diol are used for rubber. For the use of urethane foam, triisocyanate is often added to make it thermosetting. The polyol is preferably contained in the durability improving agent in an amount of 0.1 to 15% by weight. If the content of the polyol exceeds 15% by weight, ductility may be improved but the viscosity may be lowered and workability may be deteriorated. If the content of the polyol is less than 0.01% by weight, the ductility improving effect may be weak.

The polyoxypropylene diamine is used to improve elongation and tensile strength. It is preferable that the polyoxypropylene diamine is contained in the durability improving agent in an amount of 0.01 to 15% by weight. If the content of the polyoxypropylene diamine exceeds 15% by weight, the performance may be improved but the price competitiveness may be deteriorated. If the content of propylene diamine is less than 0.01% by weight, the effect of improving the elongation and tensile strength may be weak.

The methylene diphenyl diisocyanate is used to control the curing time. The methylene diphenyl diisocyanate is preferably contained in the durability improving agent in an amount of 0.01 to 15% by weight. When the content of the methylene diphenyl diisocyanate exceeds 15% by weight, the curing time is shortened, If the content of methylene diphenyl diisocyanate is less than 0.01% by weight, it may be difficult to expect early strength and early durability because the curing time is delayed.

The acetyl peroxide is used as a reaction initiator to improve the reactivity. The acetyl peroxide is preferably contained in the endurance performance improving agent in an amount of 0.01 to 15% by weight. If the content of the acetyl peroxide exceeds 15% by weight, the reactivity may be promoted too much and the workability may be deteriorated. If the content of the acetyl peroxide is less than 0.01% by weight, the workability may be improved but the effect of improving the reactivity may be weak .

The endurance performance improving agent may further include fluorine for improving the sliding property and the antifouling property. The fluorine is preferably contained in the endurance performance improving agent in an amount of 0.01 to 15% by weight. If the fluorine content exceeds 15% by weight, the antifouling performance is improved, but the price competitiveness may be deteriorated. If the fluorine content is less than 0.01% by weight, the effect of improving the sliding property and the antifouling property may be weak.

In addition, the endurance performance improving agent may further include a silane resin for improving durability. The silane resin is preferably contained in the durability improving agent in an amount of 0.01 to 15% by weight. If the content of the silane resin exceeds 15% by weight, the durability performance is improved but the price competitiveness may be deteriorated. If the content of the silane resin is less than 0.01% by weight, the durability improvement effect may be weak.

The endurance performance improving agent may further include silicon for improving antifouling property and water repellency. The silicone is preferably contained in the durability improving agent in an amount of 0.01 to 15% by weight. If the content of silicon exceeds 15 wt%, antifouling property and water repellent performance are improved, but price competitiveness may be lowered. If the content of silicon is less than 0.01 wt%, antifouling property and water repellency improving effect may be insufficient.

The endurance performance improving agent may further include a shrinkage reducing agent. The shrinkage reducing agent is used to reduce the drying shrinkage of the cement mortar composition. The shrinkage reducing agent is preferably contained in the durability improving agent in an amount of 0.01 to 5% by weight. As the shrinkage reducing agent, it is preferable to use at least one of polyoxyethylene, polypropylene glycol, and polyethylene glycol.

In addition, the endurance performance improving agent may further include a defoaming agent. The defoaming agent is used to remove bubbles in the durability improving agent to increase strength and durability. Further, when the antifoaming agent is added to the durability improving agent, air entraining effect can be imparted to improve workability and pot life. It is preferable that the antifoaming agent is contained in the durability improving agent in an amount of 0.01 to 2% by weight. Examples of the defoaming agent include an alcohol defoaming agent, a silicone defoaming agent, a fatty acid defoaming agent, an oil defoaming agent, a polyester defoaming agent, and an oxyalkylene defoaming agent, but preferably a polyester defoaming agent is used.

In addition, the endurance performance improving agent may further include a water reducing agent. The water reducing agent is used to improve the strength and durability by reducing the water-cement ratio and to secure the fluidity of the durability improving agent. When the water reducing agent is added to the endurance performance improving agent, the water-cement ratio is reduced. The water reducing agent is preferably contained in the durability improving agent in an amount of 0.01 to 2% by weight. 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.

The inorganic binder may include Portland cement, blast furnace slag powder, waste activated carbon, aluminum hydroxide, anhydrous gypsum, magnesium sulfoaluminate, elvan powder, zinc oxide, clam shell, and aluminum sulfate. The inorganic binder is usually 5 to 70 wt% of Portland cement, 5 to 45 wt% of blast furnace slag powder, 5 to 20 wt% of waste activated carbon, 1 to 15 wt% of aluminum hydroxide, 1 to 20 wt% of anhydrous gypsum, 0.1 to 15% by weight of natrium, 0.1 to 10% by weight of crumb stone powder, 0.01 to 10% by weight of zinc oxide, 0.01 to 10% by weight of shellfish shell and 0.01 to 10% by weight of aluminum potassium sulfate.

It is preferable that the ordinary Portland cement uses cement conforming to the KS standard. The ordinary Portland cement is preferably contained in the inorganic binder in an amount of 5 to 70% by weight.

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 inorganic binder in an amount of 5 to 45% by weight.

The waste activated carbon has a strong adsorption power, anion emission, and far-infrared radiation characteristics and is known to have functions such as a hygroscopic effect, a deodorizing effect, a gas adsorption, a deodorizing effect, a humidity control, an antibacterial effect, a decaying effect, Particularly, activated carbon is an aggregate of amorphous carbon, which is produced by activating plant material such as sawdust, wood, and coconut shells and coal, which is a mineral system, with water vapor at a high temperature of 900 to 1200 ° C. In the activation process, numerous Å units of micropores of molecular size are formed, so that the functional group of the carbon atom adsorbs the adsorbed material by applying an attractive force to the surrounding liquid or gas. Activated carbon is classified into powder activated carbon and granular activated carbon according to particle size, and is widely used in all industrial fields for decolorization, deodorization, solvent recovery, and water and wastewater treatment. Particularly, granular activated carbon is used for air purification, water and wastewater treatment, ultrapure water treatment and the like. However, since there is a limit on the adsorption power of activated carbon, the activated carbon used in the water treatment plant must be replaced with new activated carbon after a certain period of time has been used. Activated carbon, once used in a water purification plant, is sometimes recycled and used repeatedly, but most of it is waste. The waste activated carbon used in the present invention is a special waste which is used for purifying tap water in a water purification plant, and is an activated carbon mixed with foreign matters such as microorganisms (aquatic bacteria), organic matter, sludge and trace metals contained in water. When waste activated carbon is used, the microorganisms contained therein may ingest and decompose organic matter in practical application, thereby exhibiting purification and purifying action. It is preferable that the activated carbon is contained in the inorganic binder in an amount of 5 to 20% by weight.

The aluminum hydroxide is used for oxidation prevention and corrosion prevention. The aluminum hydroxide is preferably contained in the inorganic binder in an amount of 1 to 15% by weight. If the content of aluminum hydroxide is less than 1 wt%, the effect of preventing oxidation and corrosion may be insufficient. If the content of aluminum hydroxide exceeds 15 wt%, curing may be accelerated and workability may be deteriorated.

The anhydrous gypsum (CaSO ₄ ) reacts with the components in the cement, in particular C ₃ A ( ₃ CaO.Al ₂ O ₃ ), to produce etrinite (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, etrinzite is mainly present at the initial stage. However, since the amount of anhydrous gypsum is sufficiently added in the case of the composition of the present invention, Zites are also generated 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 the inorganic binder in an amount of 1 to 20% by weight. When the content of the gypsum anhydride is increased, the fast curing property is exhibited. If the content of the gypsum anhydrite is less than 1 wt%, the strength and workability may be deteriorated. When the content of the gypsum anhydrite is more than 20 wt% Good properties can be obtained due to the characteristics, but the production cost is not high and it is not economical.

The magnesium sulfoaluminate is an inorganic fastidious mineral material which is added to increase hydration reactivity and to suppress cracking. It reacts with water in an instant when it comes into contact with water to generate an ettringite hydrate, It is possible to obtain an excellent compressive strength in a short time. The magnesium sulfoaluminate is preferably contained in the inorganic binder in an amount of 0.1 to 15% by weight. When the content of the magnesium sulfosilicate is less than 0.1% by weight, the effect of improving the strength and suppressing the cracking may be insignificant. When the content of the magnesium sulfoaluminate is less than 0.1% by weight, Is more than 15% by weight, good physical properties can be obtained due to rapid curing characteristics, but the production cost is high and it is not economical.

The granite is a fine porous structure composed of quartz and feldspathic densely mixed on a green background. It is composed of anhydrous silicic acid and aluminum oxide as main components and is composed of ferric oxide, calcium, magnesium, germanium , And a total of 45 kinds of minerals such as selenium. Therefore, the elvan is a porous material that adsorbs, decomposes and removes water vapor, contaminants, organic matter, and germs, and when immersed in water, the main components such as trace enzymes, iron, magnesium, calcium, and germanium are eluted, (COD) and biological oxygen demand (BOD) are lowered to prevent spoilage of water as well as vitality to living organisms. It changes into active water to control the year and hardness, and water quality and soil And it acts to neutralize water. Especially, because it is made of multi-element and porous material, ion and radiation act to remove water impurities and odor and prevent water from decaying. The quartz powder used in the present invention is a powder obtained by pulverizing a quartz stone having a particle size of 200-300 mesh, which plays a role of elution of mineral components, adsorption of toxic substances, high ion exchangeability, neutralization of acids and bases. It is preferable that the elvan powder is contained in the inorganic binder in an amount of 0.1 to 10 wt%. If the content of the elvan powder is less than 0.1% by weight, the effects of adsorption, ion exchange, and the like may be insignificant. If the content of the elvan powder exceeds 10% by weight, good physical properties may be obtained, It is not economical.

The zinc oxide can be used for antiseptic and antibacterial functions. The zinc oxide is preferably contained in the inorganic binder in an amount of 0.01 to 10 wt%. When the weight ratio of zinc oxide is increased, the antifouling performance is exhibited. When the content of zinc oxide is less than 0.01 wt%, the effect of preservation, antibacterial and antifouling performance may be weak. When the content of zinc oxide is more than 10 wt% The strength development can be lowered and the production cost is increased, which is not economical.

The shell shell is made of calcium carbonate as a main component and calcium (Ca) component of the shell shell reacts well with phosphorus (P). Thus, the shell shell is obtained from detergents, bleaches, pesticides, wastewaters, Phosphorus is removed. The shell shell angle is preferably 0.01 to 10 wt% in the inorganic binder. If the content of the shellfish shell exceeds 10% by weight, the toxic substance removal performance is improved but the workability may be deteriorated. If the shellfish shell content is less than 0.01% by weight, the toxic substance removal performance may be weak.

The potassium aluminum sulfate is used to compensate for the shrinkage of the hardened cement when a small amount is added to the cement so as to prevent cracks and durability deterioration caused by autogenous shrinkage and drying shrinkage of the hardened cement. The aluminum potassium sulfate is preferably contained in the inorganic binder in an amount of 0.01 to 10 wt%. When the weight ratio of the aluminum sulfate is increased, the swelling effect is exhibited. When the content of the potassium aluminum sulfate is less than 0.01 wt%, the shrinkage compensation effect may be insufficient. When the content of the aluminum sulfate is more than 10 wt% Cracks may occur due to excessive expansion.

The inorganic binder 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 reducing the water-cement ratio of the cement mortar composition. The water reducing agent may be a polycarbonate-based, melamine-based or naphthalene-based fluidizing agent. The melamine- or naphthalene-based water reducing agent is less effective in improving the strength and durability than the polycarboxylic acid-based water reducing agent, has a small effect of reducing the water-cement ratio, and has a poor mixing property when mixed with the durability improving agent There are disadvantages. Therefore, the water reducing agent is preferably a polycarboxylic acid-based water reducing agent, and is preferably contained in the inorganic binder in an amount of 0.01 to 2% by weight.

The fine aggregate may comprise silica silica, dolomite and loess. The fine aggregate preferably comprises 45 to 99% by weight of silica silica, 0.1 to 35% by weight of dolomite and 0.1 to 25% by weight of loess. In general, aggregate is classified into fine aggregate and coarse aggregate. Coarse aggregate means aggregate exceeding 5 mm in diameter. Hereinafter, fine aggregate refers to aggregate having particle size of 5 mm or less in comparison with coarse aggregate. The use of the fine aggregate containing dolomite excellent in the far-infrared ray effect has an advantage of excellent heat insulation and strength, and excellent durability against acidity, saltiness and the like.

It is preferable that the silica silica has a particle size of from 4 to 8 (0.05 to 3.0 mm). If the particle size of the silica silica is larger than the above range, the fluidity of the cement mortar composition may be deteriorated. If the particle size is smaller than this range, the workability of the cement mortar composition may be deteriorated. It is preferable that the silica silica is contained in the fine aggregate in an amount of 45 to 99% by weight.

The dolomite has a specific gravity of 2.9 and a hardness of about 4. The dolomite is excellent in strength, abrasion resistance and fire resistance and is used to improve strength, abrasion resistance and fire resistance in a cement mortar composition. The dolomite is preferably contained in the fine aggregate in an amount of 0.1 to 35% by weight.

The loess is used for improving far infrared ray emission, foreign matter adsorption and preservation performance. The loess is preferably contained in the fine aggregate in an amount of 0.1 to 25% by weight.

Hereinafter, a method for producing a cement mortar composition according to a preferred embodiment of the present invention will be described.

The cement mortar composition according to a preferred embodiment of the present invention is prepared by premixing 10 to 79% by weight of an inorganic binder and 20 to 80% by weight of a fine aggregate in a forced mixer and then adding 0.01 to 20% by weight of a durability improving agent and 0.1 to 20% By weight, and mixing the mixture for a predetermined time (for example, 1 to 5 minutes) with a forced mixer or a continuous mixer.

Hereinafter, a method of repairing a concrete structure according to a preferred embodiment of the present invention will be described. Hereinafter, the concrete structure refers to concrete structures such as tunnels, marine concrete structures, underwater concrete structures, exponential structures, hydraulic structures (agricultural roads, hydrographic structures, hydrological structures), underground structures, underground structures, sewer pipes, sewage culverts, It is a structure such as water treatment plant, food factory, chemical plant, housing floor and related structures, manhole, agricultural water pipe, concrete hump pipe, shore block, road surface, bridge bridge, concrete slab of bridge, It is 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 an impurity, a run-in, or a deteriorated portion of a concrete structure, priming the removed portion and rust-proofing the exposed reinforcing bars, A step of placing the cement mortar composition on the primer-treated and anti-rust-treated resultant to restore its cross-section, and finishing the surface of the restored resultant and applying a surface protective agent.

The primer treatment may use at least one selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, methyl methacrylate, silane-based compounds and the endurance improving agents.

The surface protective agent may be at least one selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, methyl methacrylate, silane-based compounds and the endurance improving agents.

Hereinafter, examples of the cement mortar composition composition according to the present invention will be more specifically shown and the present invention is not limited by the following examples.

≪ Example 1 >

43 wt% of inorganic binder and 47 wt% of fine aggregate were premixed in a forced mixer, and then 6 wt% of durability improver and 4 wt% of water were added and stirred for 2 minutes with a forced mixer to prepare a cement mortar composition.

The inorganic binder is usually composed of 44 wt% of Portland cement, 20 wt% of blast furnace slag powder, 10 wt% of waste activated carbon, 5 wt% of aluminum hydroxide, 5 wt% of anhydrous gypsum, 5 wt% of magnesium sulfoaluminate, 2 wt% zinc oxide, 0.5 wt% shellfish shell, 3 wt% aluminum potassium sulfate, and 0.5 wt% water reducing agent. A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

The endurance performance improving agent may be selected from the group consisting of 90 wt% polyurethane, 2 wt% phthalate, 1 wt% polyol, 1 wt% polyoxypropylene diamine, 1 wt% methylene diphenyl diisocyanate, 1 wt% acetyl peroxide, 1% by weight of silane resin, 1% by weight of silicone, 0.5% by weight of defoamer, 0.2% by weight of water reducing agent and 0.3% by weight of shrinkage reducing agent.

The fine aggregate used was a mixture of 85% by weight of silica silica, 10% by weight of dolomite and 5% by weight of loess.

≪ Example 2 >

43 wt% of inorganic binder and 47 wt% of fine aggregate were premixed in a forced mixer, and then 6 wt% of durability improver and 4 wt% of water were added and stirred for 2 minutes with a forced mixer to prepare a cement mortar composition.

The inorganic binder is usually composed of 44 wt% of Portland cement, 20 wt% of blast furnace slag powder, 10 wt% of waste activated carbon, 5 wt% of aluminum hydroxide, 5 wt% of anhydrous gypsum, 5 wt% of magnesium sulfoaluminate, 2 wt% zinc oxide, 0.5 wt% shellfish shell, 3 wt% aluminum potassium sulfate, and 0.5 wt% water reducing agent. A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

The durability performance improving agent may be selected from the group consisting of 80 wt% polyurethane, 5 wt% phthalate, 2 wt% polyol, 2 wt% polyoxypropylene diamine, 2 wt% methylene diphenyl diisocyanate, 2 wt% acetyl peroxide, 2% by weight of silane resin, 2% by weight of silicone, 0.5% by weight of defoamer, 0.2% by weight of water reducing agent and 0.3% by weight of shrinkage reducing agent.

The fine aggregate used was a mixture of 85% by weight of silica silica, 10% by weight of dolomite and 5% by weight of loess.

≪ Example 3 >

43 wt% of inorganic binder and 47 wt% of fine aggregate were premixed in a forced mixer, and then 6 wt% of durability improver and 4 wt% of water were added and stirred for 2 minutes with a forced mixer to prepare a cement mortar composition.

The inorganic binder is usually composed of 44 wt% of Portland cement, 20 wt% of blast furnace slag powder, 10 wt% of waste activated carbon, 5 wt% of aluminum hydroxide, 5 wt% of anhydrous gypsum, 5 wt% of magnesium sulfoaluminate, 2 wt% zinc oxide, 0.5 wt% shellfish shell, 3 wt% aluminum potassium sulfate, and 0.5 wt% water reducing agent. A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

The endurance performance improving agent is composed of 70 wt% polyurethane, 6 wt% phthalate, 3.5 wt% polyol, 3 wt% polyoxypropylene diamine, 3 wt% methylenediphenyl diisocyanate, 3 wt% acetyl peroxide, 3.5 wt% 3.5% by weight of silane resin, 3.5% by weight of silicone, 0.5% by weight of defoamer, 0.2% by weight of water reducing agent and 0.3% by weight of shrinkage reducing agent.

The fine aggregate used was a mixture of 85% by weight of silica silica, 10% by weight of dolomite and 5% by weight of loess.

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 Example 1 and Comparative Example 2 to be described later are examples of the ordinary cement mortar composition and the polymer cement mortar Lt; / RTI >

≪ Comparative Example 1 &

43% by weight of Portland cement, 47% by weight of fine aggregate and 10% by weight of water were mixed with a forced mixer to prepare a usual cement mortar composition.

≪ Comparative Example 2 &

40% by weight of Portland cement and 47% by weight of fine aggregate were premixed by a forced mixer, and then 6% by weight of polyurethane and 4% by weight of water were added and stirred with a forced mixer for 2 minutes to prepare a polymer cement mortar composition.

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 >

The cement mortar composition compositions prepared according to Examples 1 to 3 and the cement mortar compositions prepared according to Comparative Examples 1 and 2 were subjected to a compressive strength test by KS F 2405 (Mortar Compressive Strength Test Method) , And the results are shown in Table 1 below. In addition, the bending strength test was carried out by KS F 2408 (Test Method of Bending Strength of Mortar), and the adhesive strength of the specimen was measured by JIS A 6916 (a surface adjusting agent for finish paint). The results are shown in Table 1 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2
burglar
(kgf / cm2) warp 96 104 110 63 85 compression 468 482 509 449 450 adhesion 14 15 16 10 12

As shown in Table 1, the flexural, compressive, tensile, and adhesive strengths of the cement mortar compositions prepared according to Examples 1 to 3 were significantly higher than those of the cement mortar compositions prepared according to Comparative Examples 1 and 2.

It was confirmed that the cement mortar composition prepared according to Examples 1 to 3 was much superior in strength to the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2.

≪ Test Example 2 &

The shrinkage ratio of the cement mortar composition prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 was measured by KS F 2424 (length change test method for concrete) The results are shown in Table 2 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Dry shrinkage (%) 0.08 0.05 0.04 0.14 0.10

As shown in the above Table 2, the cement mortar composition prepared according to Examples 1 to 3 has a shrinkage reduction effect due to a decrease in the amount of drying shrinkage as compared with the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 I could confirm.

≪ Test Example 3 >

The cement mortar composition prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were measured in accordance with the method defined in JIS A 1171 (Test Method of Polymer Cement Mortar) The results are shown in Table 3 below. If the water absorption rate is high, impurities or water may penetrate into the concrete, which may increase the porosity in the concrete, which may result in damage to the structure.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Absorption Rate (%) 0.61 0.52 0.42 2.2 0.91

As shown in Table 3, the cement mortar composition prepared according to Examples 1 to 3 had a lower water absorption rate than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2.

<Test Example 4>

The cement mortar composition prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were tested for resistance to chloride ion penetration by KS F 4042, Respectively.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Chloride ion penetration resistance (coulombs) 510.2 508.3 481.6 1825.3 868.5

As shown in Table 4 above, the cement mortar composition prepared according to Examples 1 to 3 showed less resistance to chloride ion penetration than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2, Was high.

&Lt; Test Example 5 >

The cement mortar composition prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were tested by JIS A 1171 (Test Method of Polymer Cement Mortar) Are shown in Table 5 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Neutralization depth (mm) 0.4 0.3 0.2 1.5 0.8

As shown in Table 5 above, the cement mortar composition prepared according to Examples 1 to 3 exhibited less neutralization penetration depth than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2, and showed resistance to neutralization High.

&Lt; Test Example 6 >

The cement mortar composition prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were subjected to a chemical resistance test using a 2% The aqueous solution of hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide was immersed in the test solution for 28 days, and the 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 -1.4 -1.2 -1.0 -8.2 -2.5 Sulfuric acid -0.3 -0.3 0.2 -2.9 -0.9 Sodium hydroxide +0.6 +0.9 +1.4 -0.2 +0.3

As shown in Table 6 above, the cement mortar composition prepared according to Examples 1 to 3 showed less weight change rate with respect to chemical resistance than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2, And that the resistance to

&Lt; Test Example 7 >

The cement mortar composition prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were subjected to the freeze-thaw resistance test according to the method defined in KS F 2456, 7. 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 92 92 93 70 90

As shown in Table 7, the durability index of the cement mortar composition prepared 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, Could know.

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 (5)

10 to 79% by weight of an inorganic binder, 20 to 80% by weight of a fine aggregate, 0.01 to 20% by weight of a durability improving agent, and 0.1 to 20%
The endurance performance improving agent may be selected from the group consisting of 45-99 wt% polyurethane, 0.1-15 wt% phthalate, 0.1-15 wt% polyol, 0.01-15 wt% polyoxypropylene diamine, 0.01-15 wt% methylene diphenyl diisocyanate, 0.01 to 15% by weight of an oxide,
The inorganic binder is usually 5 to 70 wt% of Portland cement, 5 to 45 wt% of blast furnace slag powder, 5 to 20 wt% of waste activated carbon, 1 to 15 wt% of aluminum hydroxide, 1 to 20 wt% of anhydrous gypsum, 0.1 to 15% by weight of natrium, 0.1 to 10% by weight of crumb stone powder, 0.01 to 10% by weight of zinc oxide, 0.01 to 10% by weight of shellfish shell and 0.01 to 10% by weight of aluminum sulfate,
Wherein the fine aggregate comprises 45 to 99% by weight of silica silica, 0.1 to 35% by weight of dolomite and 0.1 to 25% by weight of loess.
The cement mortar composition according to claim 1, wherein the endurance performance improving agent further comprises 0.01 to 15% by weight of fluorine and 0.01 to 15% by weight of silane resin.
The cement mortar according to claim 1, wherein the endurance improving agent further comprises 0.01 to 15% by weight of silicon and 0.01 to 5% by weight of at least one material selected from polyoxyethylene, polypropylene glycol and polyethylene glycol. Composition.
The method of claim 1, wherein the phthalate comprises at least one material selected from the group consisting of polytrimethylene terephthalate, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, diallyl phthalate and diallyl isophthalate,
The polyol may be at least one material selected from sorbitol, glycerol, polyethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, hexylene glycol, 1,4-butanediol and 1,2,6- &Lt; / RTI &gt;
Removing impurities, run-ins, or deteriorated portions of the concrete structure;
Priming the removed portion and rusting the exposed reinforcing bar;
Placing a cement mortar composition according to claim 1 on top of the resultant primer-treated and rust-proofed product to restore a cross-section; And
And a step of finishing the recovered product by surface finishing and applying a surface protective agent,
Wherein the primer treatment uses at least one material selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethyl vinyl acetate, methyl methacrylate, silane-based compounds,
Wherein the surface protective agent is at least one selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinylacetate, methyl methacrylate, silane-based compounds, and durability improving agents described in claim 1. Repair method.