KR102248403B1 - Mortar composition having emhanced crack control performance and repairing and reinforcing method of concrete structure using the same - Google Patents

Abstract

The present invention relates to a mortar composition with an improved crack control performance and a reinforcing method of concrete structure using the same, capable of minimizing a defect even after repair and reinforcement. As a mortar composition with improved crack control performance, the present comprises: 10-80 wt% of crack control type binder; 10-80 wt% of fine aggregate; 0.01-20 wt% of performance improvement admixture; and 0.1-30 wt% of water.

Description

Mortar composition with improved crack control performance and repair and reinforcement method of concrete structure using the same {MORTAR COMPOSITION HAVING EMHANCED CRACK CONTROL PERFORMANCE AND REPAIRING AND REINFORCING METHOD OF CONCRETE STRUCTURE USING THE SAME}

The present invention satisfies basic physical performance and durability such as flexural strength, compressive strength, adhesion strength, etc. in a harsh environment where cracks are likely to occur, and improves crack resistance by drying shrinkage, thereby minimizing defects even after repair and reinforcement. The present invention relates to a mortar composition with improved control performance and a method for repairing and reinforcing concrete structures using the same.

Concrete used for construction of architectural or civil structures includes cement, water, aggregate, etc., and has a property that hardens by hydration reaction, so it is of good quality as a building material, economical, and semi-permanent, so it has been used in construction materials for more than 5,000 years. .

Concrete structures are continuously subjected to external loads or forces due to differential settlement after construction, and since contraction and expansion are repeated due to external temperature changes, cracks occur from areas with weak structural strength over time. In addition, when the pH of the concrete structure is lowered from 12 to 9 or less due to carbon dioxide gas, water, and salt in the air, the alkali component is neutralized and the neutralization of the concrete proceeds rapidly. As a result, the compressive strength of concrete and tensile strength of reinforcing bars are lowered. Therefore, cracks in the reinforced concrete are increased, resulting in a delamination phenomenon of the concrete. When a crack occurs, water easily penetrates through the crack of the concrete, and internal reinforcement corrosion or leakage occurs, which significantly reduces the durability of the concrete structure and deteriorates the aesthetics.

When a concrete structure is damaged such as a crack, it is usually repaired using mortar for repair and reinforcement in order to prevent further deterioration of durability. In addition, as a conventional technique, a method of reducing the amount of shrinkage by mixing and using a crack reducing material in a mortar for repair and reinforcement to reduce cracking has been proposed.

However, in the case of such a conventional technology, in poor environments such as high temperature curing environment, low humidity environment, windy environment, moisture from the surface rapidly blows away, the strength is greatly reduced, and the crack resistance is low, so that it is practically used as a crack reducing material. The problem of not functioning still remained. In addition, even after repair and reinforcement in a poor environment, secondary defects are frequently generated, which is a problem. In this case, the renovation work for renovation is more complicated than the primary repair, the construction cost is increased, and foreign matter is additionally generated by processes such as chipping and grinding, so quality control is difficult. Occurred.

Therefore, in order to minimize secondary defects after repair and reinforcement, the durability of the mortar for repair and reinforcement must be excellent. In particular, the development of mortar with the function of minimizing the cracks of the mortar for repair and reinforcement and suppressing the occurrence of cracks is required. It is becoming.

Korean Patent Registration No. 10-0846159 Korean Patent Registration No. 10-1774509 Korean Patent Registration No. 10-1965886

The present invention was devised to solve the above-described problems, and an embodiment of the present invention satisfies basic physical performance and durability such as flexural strength, compressive strength, and adhesion strength in a poor environment where cracks are likely to occur, and It is intended to provide a mortar composition with improved crack control performance capable of minimizing defects even after repair and reinforcement by improving the crack resistance due to this.

In addition, another embodiment of the present invention is to provide a method for repairing and reinforcing a concrete structure using a mortar composition having improved crack control performance.

Various problems to be solved by the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

One embodiment of the present invention is a mortar composition with improved crack control performance, comprising 10 to 80% by weight of a crack control binder, 10 to 80% by weight of fine aggregate, 0.01 to 20% by weight of a performance-improving admixture, and 0.1 to 30% by weight of water, ;

The crack control type binder is based on 100 parts by weight of crude steel Portland cement, 40 to 70 parts by weight of calcium sulfoaluminate, 40 to 70 parts by weight of calcium fluorite smelting by-product, 10 to 30 parts by weight of magnesium chloride, 1 to 10 parts by weight of manganese carbonate, 1 to 10 parts by weight of hard shale protein and 0.1 to 5 parts by weight of clinoptilolite;

The performance-improving admixture is, based on 100 parts by weight of the acrylamide-acrylic acid copolymer, 70 to 80 parts by weight of the polyamide-imide copolymer, 40 to 70 parts by weight of ethoxyethyl acrylate, and a poly oligomer represented by the following formula (1). Silsesquioxane 10 to 30 parts by weight, butyl (meth) acrylate-butadiene copolymer 10 to 30 parts by weight, poly(lactic acid) and poly(3-hydroxypropionate) (poly(3 -hydroxypropionate)) containing 1 to 10 parts by weight of a biopolymer, 1 to 10 parts by weight of polyhydroxyalkanoate, 1 to 10 parts by weight of fermented paper sludge, and 0.1 to 5 parts by weight of xanthorazole. It provides a mortar composition with improved performance.

[Formula 1]

The biopolymer is a mixture of 0.1% to 95% by weight of poly(lactic acid) and 5% to 99.9% by weight of poly(3-hydroxypropionate) And preparing a mixture by stirring at 45 to 55° C., and after casting the prepared mixture on a glass plate, additionally applying lupeol and drying at room temperature for 2 to 3 days to prepare a biopolymer. The prepared biopolymer has a tensile strength of 40 to 55 Mpa, a tensile modulus of 2.0 to 4.0 GPa, and an elongation at break of 20 to 600%.

The lupeol is a lupeol extracted from lupine; The lupine-extracted lupeol is pulverized after drying a lupine seed or a pod of a lupine seed to obtain a lupine seed powder or a pod powder of a lupine seed; And adding 95% or more ethanol as an extraction solvent to the lupine seed powder or the pod powder of the lupine seeds in a weight ratio of 1: 3 to 10 and heating at 35 to 80° C. to extract the lupeol. Can be used.

The fermented paper sludge is further mixed with 10 to 50 parts by weight of dry pulverized red ginseng meal powder, 0.1 to 5 parts by weight of monosodium glutamate, and 0.1 to 5 parts by weight of cyclodextrin, based on 100 parts by weight of paper paper sludge. After doing; 5 to 15 parts by weight of Curtobacterium oceanosedimentum may be inoculated and fermented at 25 to 40° C. for 48 to 96 hours may be used.

In addition, another embodiment of the present invention is a method for repairing and reinforcing a concrete structure using a mortar composition having improved crack control performance, comprising removing impurities, latencies, or deteriorated areas of the concrete structure, and Step of primer or blooming treatment, the step of repairing the cross section using equipment to spray the mortar composition with improved crack control performance on the primer or blooming treatment, and finishing the surface before the resultant from which the cross section is restored is completely cured. It provides a method of repairing and reinforcing a concrete structure comprising the step of curing and protecting the surface by applying a surface finish.

According to the mortar composition having improved crack control performance according to an embodiment of the present invention and a method for repairing and reinforcing a concrete structure using the same, basic physical performance and durability such as flexural strength, compressive strength, adhesion strength, etc. even in harsh environments where cracks are likely to occur. Has the effect of satisfying. In particular, since it can function to provide moisture even in a low humidity environment where cracks are likely to occur, there is an effect of continuously improving strength.

In addition, when used for repair or reinforcement in deteriorated parts of a concrete structure, drying shrinkage can be effectively reduced in the repaired and reinforced parts, and as a result, crack resistance due to dry shrinkage can be greatly improved. . Accordingly, there is an effect of minimizing additional defects by effectively preventing the phenomenon of durability deterioration even after repair and reinforcement.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of the claims to be described later.

The term "concrete structure" as used herein includes all of the concrete pavement, sidewall concrete, road surface, bridge bridge surface, bridge concrete slab, bridge expansion joint, and more specifically, rainwater and sewage-related structures, sewage End treatment plant structures, underwater concrete structures, offshore concrete structures, repair structures (agricultural waterways, drainage channels, water bridges, hydrogate structures), chemical plants, concrete structures and precast products under harsh environments such as water purification plants, sewage pipes, sewage culverts, manholes and related It is used to include structures made of concrete, such as underground structures, waterborne structures, underground structures, road tunnels, covered structures, and other related structures, or their underground buried structures.

One embodiment of the present invention is a mortar composition with improved crack control performance, comprising 10 to 80% by weight of a crack control binder, 10 to 80% by weight of fine aggregate, 0.01 to 20% by weight of a performance-improving admixture, and 0.1 to 30% by weight of water, ; The crack control type binder is based on 100 parts by weight of crude steel Portland cement, 40 to 70 parts by weight of calcium sulfoaluminate, 40 to 70 parts by weight of calcium fluorite smelting by-product, 10 to 30 parts by weight of magnesium chloride, 1 to 10 parts by weight of manganese carbonate, 1 to 10 parts by weight of hard shale protein and 0.1 to 5 parts by weight of clinoptilolite; The performance-improving admixture is, based on 100 parts by weight of the acrylamide-acrylic acid copolymer, 70 to 80 parts by weight of the polyamide-imide copolymer, 40 to 70 parts by weight of ethoxyethyl acrylate, and a poly oligomer represented by the following formula (1). Silsesquioxane 10 to 30 parts by weight, butyl (meth) acrylate-butadiene copolymer 10 to 30 parts by weight, poly(lactic acid) and poly(3-hydroxypropionate) (poly(3 -hydroxypropionate)) containing 1 to 10 parts by weight of a biopolymer, 1 to 10 parts by weight of polyhydroxyalkanoate, 1 to 10 parts by weight of fermented paper sludge, and 0.1 to 5 parts by weight of xanthorazole. It provides a mortar composition with improved performance.

[Formula 1]

According to the mortar composition having improved crack control performance according to an embodiment of the present invention and a method for repairing and reinforcing a concrete structure using the same, basic physical performance and durability such as flexural strength, compressive strength, adhesion strength, etc. even in harsh environments where cracks are likely to occur. Has the effect of satisfying. In particular, since it can function to provide moisture even in a low humidity environment where cracks are likely to occur, there is an effect of continuously improving strength.

In addition, when used for repair or reinforcement in deteriorated parts of a concrete structure, drying shrinkage can be effectively reduced in the repaired and reinforced parts, and as a result, crack resistance due to dry shrinkage can be greatly improved. . Accordingly, there is an effect of minimizing additional defects by effectively preventing the phenomenon of durability deterioration even after repair and reinforcement.

The mortar composition with improved crack control performance according to an embodiment of the present invention comprises 10 to 80% by weight of a crack-controlling binder, 10 to 80% by weight of fine aggregate, 0.01 to 20% by weight of a performance-improving admixture, and 0.1 to 30% by weight of water. .

The crack control type binder further improves durability such as basic strength characteristics such as flexural strength, compressive strength, and adhesion strength, abrasion resistance and deodorization, antibacterial performance, and acid and salt resistance.

The crack control type binder is based on 100 parts by weight of crude steel Portland cement, 40 to 70 parts by weight of calcium sulfoaluminate, 40 to 70 parts by weight of calcium fluorite smelting by-product, 10 to 30 parts by weight of magnesium chloride, 1 to 10 parts by weight of manganese carbonate, Those containing 1 to 10 parts by weight of hard shale protein and 0.1 to 5 parts by weight of clinoptilolite may be preferably used.

More specifically, it is preferable to use a cement conforming to the KS standard as the crude steel Portland cement. More specifically, the crude steel Portland cement can provide excellent initial strength expression and workability by using a powder having a powderiness of 5,000 to 9,000 cm ² /g, and has an effect of very suppressing the occurrence of cracks.

The calcium sulfoaluminate provides fast hardening properties, and functions to improve high strength properties such as shrinkage compensation, bending strength, compressive strength, and adhesion strength, as well as preventing material separation and material loss. The calcium sulfoaluminate is preferably contained in the range of 40 to 70 parts by weight based on 100 parts by weight of the crude steel Portland cement. When the content of the calcium sulfoaluminate is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the calcium sulfoaluminate is too high, the curing speed becomes too fast and workability may be deteriorated. There is this.

The calcium fluorite smelting by-product is a by-product generated when calcium fluorite is smelted, and has an excellent effect of preventing micro-crack formation due to shrinkage compensation, and has a function of improving durability such as excellent strength, non-flammability, acid and salt resistance. The calcium fluorite smelting by-product is more preferably containing 0.5 to 5 parts by weight of _{CaF 2 , 50 to 60 parts by weight of SO 3} , 40 to 45 parts by weight of CaO, and 0.1 to 1 parts by weight of water, based on 100 parts by weight _{of CaSO 4} Can be used. In addition, the powderiness of the calcium fluorite smelting by-product can be changed according to the user's selection, but the above-described effect can be further improved by using ^{preferably 3,000 to 5,000 cm 2 /g.}

The calcium fluorite smelting by-product is preferably contained in the range of 40 to 70 parts by weight based on 100 parts by weight of the crude steel Portland cement. When the content of the calcium fluorite smelting by-product is too small, the above-described improvement effect may be insufficient, and when the content of the calcium fluorite smelting by-product is too high, the curing speed may be too fast and workability may be deteriorated. There is this.

The magnesium chloride has a very dense structure of hydrated minerals to prevent cracking of concrete and to prevent contraction of concrete, as well as to improve durability such as material separation prevention, water resistance, acid and salt resistance. The magnesium chloride is preferably contained in the range of 10 to 30 parts by weight based on 100 parts by weight of the crude steel Portland cement. When the content of magnesium chloride is too small, the above-described improvement effect may be insufficient, and when the content of magnesium chloride is too large, the viscosity becomes too high and workability may be deteriorated.

The manganese carbonate functions to improve durability such as excellent strength, abrasion resistance, corrosion resistance, acid resistance and salt decomposition resistance. In particular, it functions to further prevent cracking of concrete by improving the lubricity with the performance-improving admixture, making the structure of the hydrated mineral more dense.

The manganese carbonate may further improve the above effect by using spherical manganese carbonate particles having an average particle diameter of 10 to 80 μm. More specifically, the spherical manganese carbonate particles are _{mixed with distilled water and hydrazine (H 2} NNH ₂ ) aqueous solution and stirred in a reactor so that the pH is 6.5 to 8; Introducing a manganese sulfate solution having a concentration of 0.5 to 3M and an aqueous ammonia solution having a concentration of 0.1 to 0.8M into the reactor; And separately mixing a carbonate solution having a concentration of 1 to 3M and 0.5 to 4% by volume of a hydrazine solution, and adding to the reactor to react. The above effect can be further improved. At this time, the carbonate solution may preferably be one or more selected from the group consisting of ammonium hydrogen carbonate, sodium carbonate, ammonium carbonate, sodium hydrogen carbonate, and mixtures thereof.

The manganese carbonate is preferably contained in the range of 1 to 10 parts by weight based on 100 parts by weight of the crude steel Portland cement. When the content of the manganese carbonate is too small, the above-described improvement effect may be insufficient, and when the content of the manganese carbonate is too large, there is a problem that the manufacturing cost is increased and price competitiveness may be lowered.

The hard shale protein is a mineral in which the pores of nanoparticles are naturally formed, and serves as a catalyst for improving reactivity, providing faster curing properties, inhibiting material separation and preventing material loss more effectively. In addition, it can provide excellent strength and abrasion resistance, and has a function of improving the durability of deodorization and antibacterial performance with excellent adsorption properties.

At this time, the hard shale protein is aged in lupeol; The hard shale protein aged in the lupeol is pulverized after drying a lupine seed or a pod of a lupine seed to obtain a lupine seed powder or a pod powder of a lupine seed; Extracting lupeol by adding 95% or more ethanol as an extraction solvent to the lupine seed powder or the pod powder of lupine seeds at a weight ratio of 1: 3 to 10 and heating at 35 to 80° C.; Preparing a slurry by mixing the extracted lupeol with hard shale protein, and then aging it for 1 to 30 days to prepare a hard shale protein slurry aged in lupeol; And polishing the hard shale protein slurry aged in the lupeol, and then drying the slurry.

The hard shale protein is preferably contained in the range of 1 to 10 parts by weight, based on 100 parts by weight of the crude Portland cement. When the content of the hard shale protein is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the hard shale protein is too high, the viscosity is too high and workability decreases, or the manufacturing cost is high. There is a problem that may reduce competitiveness.

The clinoptilolite is a natural siliceous material and has pozzolanic properties, and improves workability by implementing excellent fluidity, and functions to prevent cracking of concrete and shrinkage of concrete through long-term strength improvement. . The clinoptilolite is preferably contained in the range of 0.1 to 5 parts by weight based on 100 parts by weight of the crude steel Portland cement. When the content of clinoptilolite is too small, the above-described improvement effect may be insufficient, and when the content of clinoptilolite is too large, there is a problem that the initial strength may be delayed. .

On the other hand, the performance-improving admixture functions to improve adhesion, fluidity, cohesion and material separation prevention, and to further improve durability such as strength and deodorization, antibacterial performance, and acid and salt resistance. In addition, by enabling mechanized construction such as spraying construction, it functions to improve work efficiency and minimize material loss during construction, thereby providing economical efficiency.

The performance-improving admixture is, based on 100 parts by weight of the acrylamide-acrylic acid copolymer, 70 to 80 parts by weight of the polyamide-imide copolymer, 40 to 70 parts by weight of ethoxyethyl acrylate, and a poly oligomer represented by the following formula (1). Silsesquioxane 10 to 30 parts by weight, butyl (meth) acrylate-butadiene copolymer 10 to 30 parts by weight, poly(lactic acid) and poly(3-hydroxypropionate) (poly(3 -hydroxypropionate)) containing 1 to 10 parts by weight of a biopolymer, 1 to 10 parts by weight of polyhydroxyalkanoate, 1 to 10 parts by weight of fermented paper sludge, and 0.1 to 5 parts by weight of xanthorazole. I can.

More specifically, the acrylamide-acrylic acid copolymer functions to improve adhesion, fluidity, cohesiveness and material separation prevention properties, and to improve durability such as strength, acid and salt resistance. In particular, shrinkage cracking can be effectively prevented by reducing drying shrinkage.

The polyamide-imide copolymer has a function of improving adhesion, fluidity, cohesion and material separation prevention properties, and further improving durability such as strength, heat resistance, and water resistance. In particular, shrinkage cracking can be effectively prevented by reducing drying shrinkage. The polyamide-imide copolymer is preferably contained in an amount of 70 to 80 parts by weight based on 100 parts by weight of the acrylamide-acrylic acid copolymer. When the content of the polyamide-imide copolymer is too small, the above-described improvement effect may be insufficient, and when the content of the polyamide-imide copolymer is too large, workability and price competitiveness are lowered. There is a problem that can be.

The ethoxyethyl acrylate functions to improve adhesion and further improve durability such as strength, water resistance, acid and salt resistance. The ethoxyethyl acrylate is preferably contained in the range of 40 to 70 parts by weight based on 100 parts by weight of the acrylamide-acrylic acid copolymer. If the content of the ethoxyethyl acrylate is too small, the above-described improvement effect may be insufficient, and if the content of the ethoxyethyl acrylate is too high, the workability and price competitiveness may be lowered. There is this.

The poly-oligomeric silsesquioxane represented by Formula 1 helps to develop initial strength, and functions to further improve durability such as excellent strength, abrasion resistance, heat resistance, acid and salt resistance. In particular, shrinkage cracking can be effectively prevented by reducing drying shrinkage. The poly oligomeric silsesquioxane represented by Formula 1 is preferably contained in the range of 10 to 30 parts by weight based on 100 parts by weight of the acrylamide-acrylic acid copolymer. When the content of the poly-oligomeric silsesquioxane is too small, the above-described improvement effect may be insufficient, and when the content of the poly-oligomeric silsesquioxane is too large, workability and price competitiveness are lowered. There is a problem that can be.

The butyl (meth) acrylate-butadiene copolymer functions to further improve durability such as excellent strength, abrasion resistance, heat resistance, water resistance, acid resistance and salt decomposition resistance. The butyl (meth) acrylate-butadiene copolymer is preferably contained in the range of 10 to 30 parts by weight based on 100 parts by weight of the acrylamide-acrylic acid copolymer. If the content of the butyl (meth) acrylate-butadiene copolymer is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the butyl (meth) acrylate-butadiene copolymer is too large, work There is a problem in that the sex and price competitiveness may be lowered.

The biopolymer containing the polylactate (poly(lactic acid) and poly(3-hydroxypropionate)) not only has excellent workability, cracking inhibition, waterproofing and adhesion performance, but also It functions to further improve durability such as water resistance, acid resistance and salt decomposition resistance, etc. More specifically, the poly(lactic acid) is a thermoplastic aliphatic polyester, which is the second among the total consumption of bioplastics in the world. Although it occupies a large amount of consumption, it has a disadvantage of brittleness due to poor elongation, and thus it is necessary to improve processability and improve physical properties in order to be used as a raw material for plastic materials. Extraction, it can be obtained by biosynthesis from microorganisms that can use lactate as a substrate or by a method of general synthesis In addition, the poly(3-hydroxypropionate)) is a polyhydric acid. One of the hydroxyalkanoates, which can be obtained by a method of biosynthesis by microorganisms, etc., and a method of biosynthesizing using polyhydroxyalkanoate synthase (PHA synthase) is known to those skilled in the art. Accordingly, a genetically engineered variant E. coli XL1-BLUE was produced, and poly(3-hydroxypropionate) was used as a biosynthetic method.

More specifically, these biopolymers are polylactate (poly(lactic acid) 0.1% to 95% by weight and poly(3-hydroxypropionate)) 5% to 99.9% by weight Mixing the mixture into a solution and stirring at 45 to 55°C to prepare a mixture; After casting the prepared mixture on a glass plate, additional lupeol is applied and dried at room temperature for 2 to 3 days to prepare a biopolymer. The above effects can be further improved by using those manufactured by a manufacturing method including the step of.

The prepared biopolymer has a tensile strength of 40 to 55 Mpa, a tensile modulus of 2.0 to 4.0 GPa, and an elongation at break of 20 to 600%.

In addition, the lupeol is a natural extract that is an eco-friendly material and has a function of securing fluidity, extending pot life, inhibiting bleeding and improving penetration performance against cracks. The lupeol may preferably be a lupeol extracted from lupine. More specifically, the lupine-extracted lupeol is obtained by drying the lupine seed or the pod of the lupine seed and then pulverizing it to obtain a lupine seed powder or a pod powder of a lupine seed; And adding 95% or more ethanol as an extraction solvent to the lupine seed powder or the pod powder of the lupine seeds in a weight ratio of 1: 3 to 10 and heating at 35 to 80° C. to extract the lupeol. The above effects can be further improved by using.

The lupeol is preferably contained in an amount of 1 to 10 parts by weight based on 100 parts by weight of the biopolymer mixture. When the content of the lupeol is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the lupeol is too large, there is a problem that the price competitiveness may be lowered.

The biopolymer containing polylactate (poly(lactic acid) and poly(3-hydroxypropionate)) is from 1 to 100 parts by weight of the acrylamide-acrylic acid copolymer. It is preferably contained in the range of 10 parts by weight.

When the content of the biopolymer is too small, there is a problem that the above-described improvement effect may be insufficient. When the content of the biopolymer is too large, the workability is improved, but the strength characteristics such as compressive strength are rather reduced or the manufacturing cost is reduced. There is a problem in that the price competitiveness may be lowered due to the increase.

The polyhydroxyalkanoate, together with the biopolymer, functions to greatly improve the excellent cracking inhibiting effect. The polyhydroxyalkanoate is preferably contained in an amount of 1 to 10 parts by weight based on 100 parts by weight of the acrylamide-acrylic acid copolymer. When the content of the polyhydroxyalkanoate is too small, the above-described improvement effect may be insufficient, and when the content of the polyhydroxyalkanoate is too large, workability and price competitiveness may be lowered. There is a problem.

The fermented paper sludge functions to improve fluidity, cohesiveness and material separation prevention properties, and to further improve durability such as acid and salt resistance.

The fermented paper sludge is further mixed with 10 to 50 parts by weight of dry pulverized red ginseng meal powder, 0.1 to 5 parts by weight of monosodium glutamate, and 0.1 to 5 parts by weight of cyclodextrin, based on 100 parts by weight of paper paper sludge. After doing; Curtobacterium oceanosedimentum (Curtobacterium oceanosedimentum) 5 to 15 parts by weight of 5 to 15 parts by weight of the fermented at 25 to 40 ℃ 48 to 96 hours can be used to further improve the above-described effect.

The fermented paper sludge is preferably contained in an amount of 1 to 10 parts by weight based on 100 parts by weight of the acrylamide-acrylic acid copolymer. If the content of the fermented paper sludge is too small, the above-described improvement effect may be insufficient, and if the content of the fermented paper sludge is too high, the initial strength development may be delayed, but price competitiveness may be lowered. There is this.

The xantorazole functions to improve durability such as excellent antibacterial effect, salt decomposition resistance, and freeze-thaw resistance. It is preferable that the xantorazole is contained in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the acrylamide-acrylic acid copolymer. If the content of xantorazole is too small, the above-described improvement effect may be insufficient, and when the content of xantorazole is too high, there is a problem that price competitiveness may be lowered.

Meanwhile, the performance-improving admixture may further include additives generally used in the art. For example, an antifoaming agent, a water reducing agent, or the like can be used.

The performance-improving admixture may further include a defoaming agent for increasing strength and durability by removing air bubbles in the performance-improving admixture. The antifoaming agent is used to increase strength and durability by removing air bubbles in the performance-improving admixture. In addition, when the antifoaming agent is added to the performance-improving admixture, it is possible to improve workability and pot life by providing an air entrainment effect. The antifoaming agent is preferably contained in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the acrylamide-acrylic acid copolymer. As the antifoaming agent, an alcohol-based antifoaming agent, a silicone-based antifoaming agent, a fatty acid-based antifoaming agent, an oil-based antifoaming agent, an ester-based antifoaming agent, an oxyalkylene-based antifoaming agent, and the like may be used. Examples of the silicone antifoaming agent include dimethyl silicone oil, polyorgano vinylidene chloride-vinyl chloride, and fluorosilicone oil. Examples of the fatty acid-based antifoaming agent include stearic acid and oleic acid. The oil-based antifoaming agent includes kerosene, animal and vegetable oil, castor oil, and the like. Examples of the ester-based antifoaming agent include solitol trioleate and glycerol monoricinolate. Examples of the oxyalkylene antifoaming agent include polyoxyalkylene, acetylene ethers, polyoxyalkylene fatty acid esters, and polyoxyalkylenealkylamines. Examples of the alcohol-based antifoaming agent include glycol.

In addition, the performance-improving admixture may further include a water reducing agent for improving strength and durability by reducing a water-cement ratio. The water reducing agent is used to reduce the water-cement ratio to improve strength and durability, and to secure the fluidity of the performance-improving admixture. When a water reducing agent is added to the performance improvement admixture, the water-cement ratio is reduced. The water reducing agent is preferably contained in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the acrylamide-acrylic acid copolymer. The water reducing agent may be a polycarboxylic acid-based, melamine-based, or naphthalene-based water reducing agent, but the naphthalene-based and melamine-based water reducer may lower the strength of the composition and lower workability and pot life compared to the polycarboxylic acid-based water reducing agent, so the strength and workability of the composition And it is preferable to use a polycarboxylic acid water reducing agent that does not decrease the pot life.

On the other hand, the fine aggregate may preferably be used to include 60 to 90% by weight of silica silica sand and 10 to 40% by weight of slag generated during the manufacture of silicon manganese ferroalloy based on the weight of the fine aggregate. In general, aggregates are divided into fine aggregates and coarse aggregates, and coarse aggregates mean aggregates with a particle diameter exceeding 5 mm, and fine aggregates in the specification of the present invention mean aggregates with a particle diameter of 5 mm or less compared to coarse aggregates. use.

More specifically, the fine aggregate that can be used in the present invention may be preferably used in which the slag generated during the manufacture of siliceous silica sand and silicon manganese ferroalloy is mixed, whereby strength, stain resistance, abrasion resistance, fire resistance, acid and salt resistance, etc. There is an advantage of excellent durability.

More specifically, the siliceous silica may preferably have an average particle diameter of 0.01 to 2 mm. When the average particle diameter of the siliceous silica is too large, there is a concern that fluidity may be deteriorated, and when it is too small, workability may be deteriorated. It is preferable that the siliceous silica is contained in an amount of 60 to 90% by weight based on the fine aggregate.

The slag generated during the manufacture of the silicon manganese ferroalloy has an effect that can greatly improve durability such as strength, antifouling resistance, abrasion resistance, fire resistance, acid and salt resistance. The slag generated during the manufacture of the silicon manganese ferroalloy is MnO: 5 to 30% by weight, SiO ₂ : 30 to 60% by weight, Al ₂ O ₃ : 10 to 30% by weight, CaO: 10 to 30% by weight, MgO: 5 It is possible to further improve the above-described effect by using a composition composed of to 20% by weight and the balance of Fe (iron) and impurities inevitably contained. The slag generated during the manufacture of the silicon manganese ferroalloy is preferably contained in an amount of 10 to 40% by weight based on the fine aggregate.

Hereinafter, a method of manufacturing a mortar composition having improved crack control performance according to an embodiment of the present invention will be described.

The mortar composition with improved crack control performance is, after premixing 10 to 80% by weight of a crack control binder and 10 to 80% by weight of fine aggregate in a vacuum-type forced mixer, 0.01 to 20% by weight of a performance-improving admixture and 0.1 to 30% by weight of water. By adding more weight %, it can be prepared by mixing for a predetermined time (eg, 1 to 10 minutes) with a forced mixer or a continuous mixer.

In addition, another embodiment of the present invention is a method for repairing and reinforcing a concrete structure using a mortar composition having improved crack control performance, comprising removing impurities, latencies, or deteriorated areas of the concrete structure, and Step of primer or blooming treatment, the step of repairing the cross section using equipment to spray the mortar composition with improved crack control performance on the primer or blooming treatment, and finishing the surface before the resultant from which the cross section is restored is completely cured. It provides a method of repairing and reinforcing a concrete structure comprising the step of curing and protecting the surface by applying a surface finish.

In this case, the deteriorated portion may further include removing rust of the exposed reinforcing bar before the step of removing the deteriorated portion to the lower portion of the reinforcing bar and performing the primer or blooming treatment.

In the case of removing impurities, latencies or deteriorated parts of the concrete structure by chipping with a grinder, planing machine, shot blaster, or hand water jet, the reinforcing bars of the concrete structure are not exposed under normal circumstances. The reinforcing bar may be exposed, and if the reinforcing bar is exposed in this way, the step of rust prevention treatment may be further included.

The primer treatment is used to mean applying a material that makes the mortar composition with improved crack control performance easy to adhere to the concrete structure. The primer treatment may use at least one or more materials selected from styrene-butadiene latex (copolymer), polyacrylic ester, acrylic, ethyl vinyl acetate, methyl methacrylate, and silane-based compounds, and thus It is not limited.

The surface finish may be at least one material selected from styrene-butadiene latex, polyacrylic ester, acrylic, ethyl vinyl acetate, methyl methacrylate, and silica-silane-based compound (condensation polymerization mixture), and is limited thereto. no.

According to the mortar composition having improved crack control performance according to an embodiment of the present invention and a method for repairing and reinforcing a concrete structure using the same, basic physical performance and durability such as flexural strength, compressive strength, adhesion strength, etc. even in harsh environments where cracks are likely to occur. Has the effect of satisfying. In particular, since it can function to provide moisture even in a low humidity environment where cracks are likely to occur, there is an effect of continuously improving strength.

In addition, when used for repair or reinforcement in deteriorated parts of a concrete structure, drying shrinkage can be effectively reduced in the repaired and reinforced parts, and as a result, crack resistance due to dry shrinkage can be greatly improved. . Accordingly, there is an effect of minimizing additional defects by effectively preventing the phenomenon of durability deterioration even after repair and reinforcement.

Above, the preferred embodiment of the present invention has been described in detail, but the present invention is not limited to the above embodiment, and various modifications by those of ordinary skill in the relevant field within the scope of the technical idea of the present invention This is possible.

<Example 1>

After premixing 43% by weight of the crack control type binder and 48% by weight of fine aggregate in a vacuum-type forced mixer, 7% by weight of a performance-improving admixture and 2% by weight of water were further added, followed by mixing with a forced mixer for 3 minutes to control cracking performance. This improved mortar composition was prepared.

At this time, the crack control type binder is based on ^{100 parts by weight of crude steel Portland cement (powder degree: 6,560 cm 2} /g), 55 parts by weight of calcium sulfoaluminate, and 52 parts by weight of calcium fluorite smelting byproduct (powder degree: 4,530 cm ² /g) Parts, magnesium chloride 18 parts by weight, manganese carbonate (average particle diameter: 63 μm) 7 parts by weight, hard shale protein 5 parts by weight, and clinoptilolite 3 parts by weight were mixed and used.

At this time, the calcium fluorite smelting by-product was used based on 100 parts by weight _{of CaSO 4} , containing 3.2 parts by weight of _{CaF 2 , 58 parts by weight of SO 3} , 42 parts by weight of CaO, and 0.7 parts by weight of water: In addition, the manganese carbonate After mixing distilled water and hydrazine (H ₂ NNH ₂ ) aqueous solution and stirring in a reactor to a pH of 7; After adding a 2M concentration of manganese sulfate solution and a 0.5M concentration of ammonia aqueous solution to the reactor; A 3M concentration of ammonium hydrogen carbonate was added to the reactor and prepared by reacting it was used.

In addition, the performance-improving admixture is based on 100 parts by weight of the acrylamide-acrylic acid copolymer, 72 parts by weight of the polyamide-imide copolymer, 58 parts by weight of ethoxyethyl acrylate, and the poly-oligomeric silses represented by Formula 1 above. Contains 21 parts by weight of quioxane, 17 parts by weight of butyl (meth)acrylate-butadiene copolymer, poly(lactic acid) and poly(3-hydroxypropionate) 7 parts by weight of a biopolymer, 3 parts by weight of polyhydroxyalkanoate, 5 parts by weight of fermented paper sludge, 3 parts by weight of xanthorazole, 0.5 parts by weight of a silicone-based antifoaming agent, and 0.5 parts by weight of a polycarboxylic acid-based water reducing agent were mixed and used.

At this time, the biopolymer was mixed with 35% by weight of poly(lactic acid) and 65% by weight of poly(3-hydroxypropionate), and stirred at 55°C. After preparing the mixture; the prepared mixture was cast on a glass plate, and then dried at room temperature for 3 days to use: In addition, the fermented paper sludge is based on 100 parts by weight of paper sludge, Curtobacteria Oceanose Dimentum (Curtobacterium oceanosedimentum) 9 parts by weight were inoculated and fermented at 37° C. for 56 hours was used.

In addition, the fine aggregate was used by mixing 87% by weight of siliceous silica sand (average particle diameter: 1.8 mm) relative to the weight of the fine aggregate and 13% by weight of slag generated during the manufacture of silicon manganese ferroalloy. At this time, the slag generated during the manufacture of the silicon manganese ferroalloy is MnO: 7 wt%, SiO ₂ : 49 wt%, Al ₂ O ₃ : 21 wt%, CaO: 12 wt%, MgO: 9 wt% and the balance Fe What was used was composed of (iron) and impurities that were inevitably contained.

<Example 2>

After premixing 43% by weight of the crack control type binder and 48% by weight of fine aggregate in a vacuum-type forced mixer, 7% by weight of a performance-improving admixture and 2% by weight of water were further added, followed by mixing with a forced mixer for 3 minutes to control cracking performance. This improved mortar composition was prepared.

At this time, the crack control type binder is based on ^{100 parts by weight of crude steel Portland cement (powder degree: 6,560 cm 2} /g), 43 parts by weight of calcium sulfoaluminate, calcium fluorite smelting by-product (powder degree: 4,530 cm ² /g) 54 weight Parts, magnesium chloride 25 parts by weight, manganese carbonate (average particle diameter: 72 μm, spherical) 8 parts by weight, hard shale protein 7 parts by weight, and clinoptilolite 2 parts by weight were mixed and used.

At this time, the calcium fluorite smelting by-product was the same as that used in Example 1; The manganese carbonate is mixed with distilled water and hydrazine (H ₂ NNH ₂ ) aqueous solution and stirred in a reactor to a pH of 6.5; After adding a 2M concentration of manganese sulfate solution and a 0.7M concentration of ammonia aqueous solution to the reactor; Separately, 3M concentration of ammonium hydrogen carbonate and 3% by volume of a hydrazine solution were mixed, added to the reactor, and reacted to form spherical particles.

In addition, the performance-improving admixture is, based on 100 parts by weight of the acrylamide-acrylic acid copolymer, 77 parts by weight of the polyamide-imide copolymer, 63 parts by weight of ethoxyethyl acrylate, and the polyoligomeric silses represented by Formula 1 above. Contains 19 parts by weight of quioxane, 11 parts by weight of butyl (meth)acrylate-butadiene copolymer, poly(lactic acid) and poly(3-hydroxypropionate) (poly(3-hydroxypropionate)) 5 parts by weight of a biopolymer, 7 parts by weight of polyhydroxyalkanoate, 5 parts by weight of fermented paper sludge, 4 parts by weight of xanthorazole, 0.5 parts by weight of a silicone-based antifoaming agent, and 0.5 parts by weight of a polycarboxylic acid-based water reducing agent were mixed and used.

At this time, the fermented papermaking sludge was the same as that used in Example 1; As for the biopolymer, 35% by weight of poly(lactic acid) and 65% by weight of poly(3-hydroxypropionate) were mixed in a solution and stirred at 55°C to prepare a mixture. After preparation; After casting the prepared mixture on a glass plate, lupeol is additionally applied in a range of 10 parts by weight based on 100 parts by weight of the biopolymer mixture, and is prepared by drying at room temperature for 3 days; tensile strength ( Tensile Strength) 45.3 Mpa, Tensile Modulus 3.2 GPa, and 384% elongation at break were used. And extracting lupeol by heating at 65° C. by adding 95% or more ethanol as an extraction solvent to the lupine seed powder and the pod powder of the lupine seed at a weight ratio of 1:7. The extracted one was used.

In addition, the fine aggregate was the same as that used in Example 1.

<Example 3>

After premixing 43% by weight of the crack control type binder and 48% by weight of fine aggregate in a vacuum-type forced mixer, 7% by weight of a performance-improving admixture and 2% by weight of water were further added, followed by mixing with a forced mixer for 3 minutes to control cracking performance. This improved mortar composition was prepared.

At this time, the crack control type binder is based on ^{100 parts by weight of crude steel Portland cement (powder degree: 6,560 cm 2} /g), 43 parts by weight of calcium sulfoaluminate, and 55 parts by ^{weight of calcium fluorite smelting byproduct (powder degree: 4,530 cm 2 /g)} Parts, magnesium chloride 19 parts by weight, manganese carbonate (average particle diameter: 72 μm, spherical) 7 parts by weight, hard shale protein 5 parts by weight, and clinoptilolite 2 parts by weight were mixed and used.

At this time, the calcium fluorite smelting by-product and the spherical manganese carbonate were the same as those used in Example 2; The hard shale protein aged in lupeol was used, and in this case, the hard shale protein aged in the lupeol was pulverized after drying the lupine seeds and the pods of the lupine seeds to obtain a lupine seed powder and a pod powder of the lupine seeds. ; Extracting lupeol by adding 95% or more ethanol as an extraction solvent to the lupine seed powder and the pod powder of the lupine seed at a weight ratio of 1:7 and heating to 65° C.; Preparing a slurry by mixing the extracted lupeol with hard shale protein, and then aging it for 28 days to prepare a hard shale protein slurry aged in lupeol; And polishing the hard shale protein slurry aged in the lupeol, and then drying it.

In addition, the performance-improving admixture is, based on 100 parts by weight of the acrylamide-acrylic acid copolymer, 73 parts by weight of the polyamide-imide copolymer, 62 parts by weight of ethoxyethyl acrylate, and the poly oligomeric silses represented by Formula 1 above. Contains 24 parts by weight of quioxane, 18 parts by weight of butyl (meth)acrylate-butadiene copolymer, poly(lactic acid) and poly(3-hydroxypropionate) 10 parts by weight of a biopolymer, 5 parts by weight of polyhydroxyalkanoate, 3 parts by weight of fermented paper sludge, 3 parts by weight of xantorazole, 0.5 parts by weight of a silicone-based antifoaming agent, and 0.5 parts by weight of a polycarboxylic acid-based water reducing agent were mixed and used.

In this case, the biopolymer was the same as that used in Example 2; The fermented paper sludge was further mixed with 48 parts by weight of dry pulverized red ginseng meal powder, 2 parts by weight of monosodium glutamate, and 3 parts by weight of cyclodextrin, based on 100 parts by weight of paper-making sludge; 11 parts by weight of Curtobacterium oceanosedimentum were inoculated, and fermented at 37° C. for 62 hours was used.

In addition, the fine aggregate was the same as those used in Examples 1 and 2.

A comparative example is presented so that the characteristics of Examples 1 to 3 according to the present invention can be more easily grasped. It should be noted that Comparative Example 1 to be described later is not a prior art of the present invention as provided for simply comparing the characteristics of the examples.

<Comparative Example 1>

Crude Portland cement (powder: 6,560 cm ² /g) 29% by weight, calcium sulfoaluminate 14% by weight, and 48% by weight of fine aggregate (silica silica sand (average particle diameter: 1.8 mm)) premixed in a vacuum-type forced mixer After that, 7% by weight of an acrylamide-acrylic acid copolymer and 2% by weight of water were further added, followed by mixing with a forced mixer for 3 minutes to prepare a mortar composition for comparison.

<Test Example>

The following experiments show experimental results comparing the characteristics of Examples according to the present invention and Comparative Example 1 so that the characteristics of Examples 1 to 3 according to the present invention can be more easily grasped.

Experiment 1 (intensity measurement)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, compression, bending and adhesion by KS F 4042 (polymer cement mortar for repairing concrete structures) A strength test was performed, and the results are shown in Table 1 below.

division Example 1 Example 2 Example 3 Comparative Example 1 burglar
(MPa) warp 13.5 13.9 14.2 11.9 compression 67.3 69.7 70.2 55.2 adhesion Standard condition 2.0 2.4 2.8 1.1 After repetitive heating and cooling 1.8 1.9 2.1 0.9

As can be seen in Table 1, the warpage, compression, and adhesion strength of the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention were compared with the mortar composition prepared according to Comparative Example 1. It was confirmed that it was significantly higher than that of.

Experiment 2 (Measurement of length change rate)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, the rate of change in length by KS F 4042 (polymer cement mortar for repairing concrete structures) was measured. , The results are shown in Table 2 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Length change rate (%) 0.01 0.01 0.01 0.08

As can be seen in Table 2, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention has a reduced length change rate compared to the comparative mortar composition prepared according to Comparative Example 1. It was confirmed that there is a shrinkage reduction effect.

Experiment 3 (measurement of water permeability)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, the water permeability according to the method specified in KS F 4042 (polymer cement mortar for repairing concrete structures) Was measured, and the results are shown in Table 3 below. If the water permeability is high, when impurities or water penetrate into the concrete, the porosity increases in the concrete, causing the structure to be damaged.

division Example 1 Example 2 Example 3 Comparative Example 1 Water permeability (g) 0.8 0.6 0.5 2.4

As can be seen in Table 3, it is confirmed that the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention has a lower water permeability compared to the comparative mortar composition prepared according to Comparative Example 1. Could.

Experiment 4 (Measurement of chloride ion penetration resistance)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, chloride ion penetration resistance test by KS F 4042 (polymer cement mortar for repairing concrete structures) Was performed, and the results are shown in Table 4 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Chloride ion penetration resistance
(coulombs) 526 487 416 951

As can be seen in Table 4, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention has chloride ion penetration resistance compared to the comparative mortar composition prepared according to Comparative Example 1. It was confirmed that it appeared less and had high resistance to salt damage.

Experiment 5 (measurement of neutralization resistance)

For the mortar composition having improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, a neutralization resistance test was performed by KS F 4042 (polymer cement mortar for repairing concrete structures). And the results are shown in Table 5 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Neutralization resistance (mm) 0.7 0.5 0.3 2.0

As can be seen in Table 5, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention has a less neutralization penetration depth compared to the comparative mortar composition prepared according to Comparative Example 1. It was confirmed that the resistance to neutralization was high.

Experiment 6 (Measurement of chemical resistance)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, 2 according to the original Japanese Industrial Standard [Method for chemical resistance test by solution deposition of concrete] The test solution was immersed in an aqueous solution of% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide 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 Weight change rate
(%) Hydrochloric acid 0.1 -0.15 -0.03 -0.7 Sulfuric acid 0.2 0.1 -0.02 0.9 Sodium hydroxide 0.15 -0.2 0.05 0.3

As can be seen in Table 6, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention was compared to the comparative mortar composition prepared according to Comparative Example 1 in terms of chemical resistance. It was confirmed that the rate of change was small and the resistance to chemical resistance was high.

Experiment 7 (measurement of freezing and thawing resistance)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, the measurement results of the freeze-thaw resistance test according to the method specified in KS F 2456 are shown below. It is shown in Table 7. Freeze-thawing refers to freezing and melting of moisture absorbed in the capillary in concrete. If freeze-thawing is repeated, fine cracks occur in the concrete structure, resulting in a problem of deteriorating durability. Table 7 below shows the durability index of each of the Examples and Comparative Examples according to the freeze-thaw resistance test.

division Example 1 Example 2 Example 3 Comparative Example 1 Durability index 93 95 96 79

As can be seen in Table 7, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention has a significantly higher durability index compared to the comparative mortar composition prepared according to Comparative Example 1. Therefore, it was confirmed that the durability was improved.

Experiment 8 (measurement of alkali resistance)

The alkali resistance test of the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1 was performed according to KS F 4042 (polymer cement mortar for repairing concrete structures). The result of measuring the compressive strength by immersing the solution at 50±2°C for 28 days and then cooling it to room temperature is shown in Table 8 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Compressive strength
(MPa) 56.1 59.9 60.2 23.7

As can be seen in Table 8, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention exhibited higher compressive strength compared to the comparative mortar composition prepared according to Comparative Example 1. It was confirmed that the resistance to alkali resistance was high.

Experiment 9 (measurement of moisture permeation resistance)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, a moisture permeation resistance test by KS F 4042 (polymer cement mortar for repairing concrete structures) was conducted. Was carried out, and the results are shown in Table 9 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Moisture permeation resistance (m) 1.4 1.2 0.9 2.3

As can be seen in Table 9, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention has a lower depth of neutralization penetration compared to the comparative mortar composition prepared according to Comparative Example 1. It was confirmed that the resistance to neutralization was high.

Experiment 10 (Measurement of water absorption coefficient and deodorization property)

For the mortar composition having improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, a water absorption coefficient test by KS F 4042 (polymer cement mortar for repairing concrete structures) was conducted. It was carried out, and the deodorization test according to the ammonia gas detection tube was performed by KFIA-FI-1004, and the results are shown in Table 10 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Water absorption coefficient (kg/m ² ㆍh ^0.5 ) 0.12 0.10 0.08 0.48 Deodorization (deodorization rate, %) 89 92 94 82

As can be seen in Table 10, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention has a lower water absorption coefficient than the comparative mortar composition prepared according to Comparative Example 1. It was confirmed that the water resistance was excellent, and it was also confirmed that the deodorization property was excellent.

Experiment 11 (water quality process test and air pollutant emission test)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, the drinking water quality process test and indoor air quality according to National Institute of Environmental Sciences Notification No. 2018-66 An air pollutant emission amount test was performed according to the Ministry of Environment Notification No. 2018-64 (Small Chamber Method), and the results are shown in Table 11 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Total coliform group (-/100mL) Not detected Not detected Not detected Not detected E. coli (-/100mL) Not detected Not detected Not detected Not detected Medium-temperature general bacteria (CFU/mL) Not detected Not detected Not detected Not detected Yeosinia(-/2L) Not detected Not detected Not detected Not detected Toluene emission (mg/m ² ㆍh) Not detected Not detected Not detected 0.16 Formaldehyde emission amount
(mg/m ² ㆍh) Not detected Not detected Not detected 0.02

As can be seen in Table 11, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention and the comparative mortar composition prepared according to Comparative Example 1 when in contact with water, E. coli, It was confirmed that food poisoning bacteria such as general bacteria and Yersinia were not detected. In addition, the highly water-resistant mortar composition having excellent workability in a highly humid environment prepared according to Examples 1 to 3 of the present invention and the comparative mortar composition prepared according to Comparative Example 1 contain air pollutants such as toluene and formaldehyde. It could be confirmed that it was not detected.

Experiment 12 (antibacterial test)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, obtained by the strains Escherichia coli ATCC 8739, Pseudomonas aeruginosa ATCC 9027 and Salmonella typhimurium NCTC 12023. An antibacterial test was performed, and the results are shown in Table 12 below.

Classification (CFU/film) Example 1 Example 2 Example 3 Comparative Example 1 Escherichia coli
ATCC 8739 Initial concentration 2.2×10 ⁵ 2.2×10 ⁵ 2.2×10 ⁵ 2.2×10 ⁵ Concentration after 48 hours
(Reduction rate, %) <25
(>99.9%) <25
(>99.9%) <25
(>99.9%) 0.8×10 ⁵
(63.6%) Pseudomonas aeruginosa ATCC 9027 Initial concentration 2.0×10 ⁵ 2.0×10 ⁵ 2.0×10 ⁵ 2.0×10 ⁵ Concentration after 48 hours
(Reduction rate, %) <25
(>99.9%) <25
(>99.9%) <25
(>99.9%) 8.2×10 ⁴
(59.0%) Salmonella typhimurium NCTC 12023 Initial concentration 2.2×10 ⁵ 2.2×10 ⁵ 2.2×10 ⁵ 2.2×10 ⁵ Concentration after 48 hours
(Reduction rate, %) <25
(>99.9%) <25
(>99.9%) <25
(>99.9%) 0.5×10 ⁴
(77.2%)

As can be seen in Table 12, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention has a superior reduction rate of bacteria compared to the comparative mortar composition prepared according to Comparative Example 1. When this bar was high, it was confirmed that the antibacterial effect was excellent.

Experiment 13 (non-flammable test)

For the mortar composition with improved crack control performance prepared in Examples 1 to 3 and the comparative mortar composition prepared in Comparative Example 1, Ministry of Land, Infrastructure and Transport Notice No. 2020-263 (Flame retardant performance of building finishing materials and fire spread prevention structure The air pollutant non-flammable test was performed according to Standard), and the results are shown in Table 13 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Mass reduction rate (%) 9.48 9.05 8.73 13.74 Maximum temperature and
Difference of final equilibrium temperature (K) 1.1 0.9 0.8 2.5 Gas hazard test (min:sec) 15:55 16:15 16:45 14:45

As can be seen in Table 13, the mortar composition with improved crack control performance prepared according to Examples 1 to 3 of the present invention compared to the comparative mortar composition prepared according to Comparative Example 1, the mass reduction rate (% ), the difference (K) between the maximum temperature and the final equilibrium temperature was small, and it was confirmed that the mean behavioral stop time of the mice was prolonged. Accordingly, it was confirmed that the mortar composition having improved crack control performance prepared according to Examples 1 to 3 of the present invention has excellent non-flammable performance compared to the comparative mortar composition prepared according to Comparative Example 1.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, all of the embodiments described above are illustrative and should be understood as non-limiting. The scope of the present invention should be construed as including all changed or modified forms derived from the meaning and scope of the claims to be described later rather than the above detailed description, and equivalent concepts thereof.

Claims (5)

A mortar composition having improved crack control performance, comprising 10 to 80% by weight of a crack control type binder, 10 to 80% by weight of fine aggregate, 0.01 to 20% by weight of a performance-improving admixture, and 0.1 to 30% by weight of water;
The crack control type binder is based on 100 parts by weight of crude steel Portland cement, 40 to 70 parts by weight of calcium sulfoaluminate, 40 to 70 parts by weight of calcium fluorite smelting by-product, 10 to 30 parts by weight of magnesium chloride, 1 to 10 parts by weight of manganese carbonate, 1 to 10 parts by weight of hard shale protein and 0.1 to 5 parts by weight of clinoptilolite;
The performance-improving admixture is, based on 100 parts by weight of the acrylamide-acrylic acid copolymer, 70 to 80 parts by weight of the polyamide-imide copolymer, 40 to 70 parts by weight of ethoxyethyl acrylate, and a poly oligomer represented by the following formula (1). Silsesquioxane 10 to 30 parts by weight, butyl (meth) acrylate-butadiene copolymer 10 to 30 parts by weight, poly(lactic acid) and poly(3-hydroxypropionate) (poly(3 -hydroxypropionate)) containing 1 to 10 parts by weight of a biopolymer, 1 to 10 parts by weight of polyhydroxyalkanoate, 1 to 10 parts by weight of fermented paper sludge and 0.1 to 5 parts by weight of xanthorazole;
The biopolymer is a mixture of 0.1% to 95% by weight of poly(lactic acid) and 5% to 99.9% by weight of poly(3-hydroxypropionate) And preparing a mixture by stirring at 45 to 55°C, and after casting the prepared mixture on a glass plate, additionally applying lupeol and drying at room temperature for 2 to 3 days to prepare a biopolymer. And
The prepared biopolymer has a tensile strength of 40 to 55 Mpa, a tensile modulus of 2.0 to 4.0 GPa, and an elongation at break of 20 to 600%.
[Formula 1]

delete The method of claim 1,
The lupeol is a lupeol extracted from lupine;
The lupine-extracted lupeol is
Drying the lupine seeds or the pods of the lupine seeds and pulverizing them to obtain a lupine seed powder or a pod powder of the lupine seeds; And
Extracted by an extraction method comprising extracting lupeol by heating at 35 to 80° C. by adding 95% or more ethanol as an extraction solvent to the lupine seed powder or the pod powder of lupine seeds at a weight ratio of 1: 3 to 10 Mortar composition with improved crack control performance.
The method of claim 1,
The fermented paper sludge is
After mixing 10 to 50 parts by weight of dry pulverized red ginseng meal powder, 0.1 to 5 parts by weight of monosodium glutamate, and 0.1 to 5 parts by weight of cyclodextrin based on 100 parts by weight of paper sludge;
Curtobacterium oceanosedimentum (Curtobacterium oceanosedimentum) 5 to 15 parts by weight of the inoculated, and fermented for 48 to 96 hours at 25 to 40 ℃ crack control performance improved mortar composition.
As a method for repairing and reinforcing a concrete structure using a mortar composition having improved crack control performance according to any one of claims 1, 3, and 4,
Removing impurities, latencies or deteriorated areas of the concrete structure; and
A step of primer or blooming treatment on the removed area, and
Restoring the cross section using equipment for spraying the mortar composition with improved crack control performance on the primer or blooming treatment,
Finishing and curing the surface before the resulting cross-section is completely cured, and
A method for repairing and reinforcing a concrete structure, comprising the step of applying a surface finish to protect the surface.