KR20230167250A - Ultra fastening high performance grout composition and grout construction method using the same - Google Patents

Abstract

The present invention relates to an ultra-fast hardening, high-performance grout composition and a grout construction method using the same. More specifically, it is a cement mortar composition that contains a high content of cement, has ultra-fast hardening properties, and contains fiber reinforcement, thereby providing high strength properties such as compressive strength and bending strength. In addition to exhibiting high toughness characteristics, it also has excellent chemical resistance and corrosion resistance characteristics, making it suitable for use in structures requiring high strength and high toughness characteristics, such as high-rise buildings, dams, long-span bridges, etc., and at the same time dramatically extending the lifespan of concrete structures. It relates to a high-performance grout composition that can be extended and a grout construction method using the same.

Description

Ultrafast high-performance grout composition and grout construction method using the same {ULTRA FASTENING HIGH PERFORMANCE GROUT COMPOSITION AND GROUT CONSTRUCTION METHOD USING THE SAME}

The present invention relates to an ultra-fast hardening, high-performance grout composition and a grout construction method using the same. More specifically, it is a cement mortar composition that contains a high content of cement, has ultra-fast hardening properties, and contains fiber reinforcement, thereby providing high strength properties such as compressive strength and bending strength. In addition to exhibiting high toughness characteristics, it also has excellent chemical resistance and corrosion resistance characteristics, making it suitable for use in structures requiring high strength and high toughness characteristics, such as high-rise buildings, dams, long-span bridges, etc., and at the same time dramatically extending the lifespan of concrete structures. It relates to a high-performance grout composition that can be extended and a grout construction method using the same.

Cement-based materials such as cement mortar and concrete are the most widely used construction materials due to their excellent mechanical performance, durability, and economic efficiency, and have played a very important role in the development of humanity and society by building modern social infrastructure over the past century.

With the rapid development of modern society and the emergence of large structures such as high-rise buildings, dams, and long-span bridges, cement-based materials are required to have high performance in various aspects to withstand the load of the structure, and the application of these high-performance cement-based materials is gradually expanding. . High-performance cement-based materials are emphasized for their characteristics of high compressive strength, tensile strength, and excellent ductility. Before the development of high-performance water reducing agents in the 1970s, concrete with a compressive strength of 40 MPa or more was called high-strength concrete, but after the development of high-performance water reducing agents, it became easy to obtain compressive strengths of 60-120 MPa. In the case of recently developed ultra-high performance concrete, the compressive strength reaches 180 MPa.

High-strength cementitious materials not only provide an additional safety margin to the main structure, but also enable the design of area-efficient structural members without compromising their load-carrying capacity. When applied to columns and beams of high-rise structures, the cross-section can be reduced to secure more space, and when applied to the construction of highway bridges, the overall cost can be reduced by extending the span and reducing the number of girders required. Reducing the cross-section of a structural member can reduce the dead load by making the member lighter, which can further reduce the foundation size and costs.

In general, high-strength cement-based materials have a high elastic modulus, which increases stability and reduces deflection of structural members compared to general cement-based materials. However, with the increase in compressive strength due to the development of high-strength cement-based materials, brittleness also increased, and the brittle behavior exhibited by cement-based materials caused cracks in the structure and decreased durability.

As a way to compensate for these shortcomings of cement-based materials, fiber-reinforced cement-based materials in which discontinuous, single-phase fibers are dispersed in an irregular arrangement are applied as reinforcing materials. Fiber reinforcement can partially alleviate the brittle characteristics of cement-based materials by improving tensile strength, resistance to cracking, and toughness. However, these fiber-reinforced cement-based materials may exhibit tensile-softening behavior along with delamination of the matrix surrounding the fibers as the load-bearing capacity decreases after a very small number of cracks are formed.

In order to ensure the safety of social infrastructure by overcoming the inherent brittleness of cement-based materials and preventing sudden destruction of cement-based material structures by absorbing large amounts of energy in situations of extremely large loads such as earthquakes, the ductility of cement-based materials is improved. You have to do it. To improve the ductility of cement-based materials, highly ductile cement-based materials that exhibit high tensile strain capacity and strain-hardening behavior have been developed.

The compressive strength of these high-ductility cement-based materials is 2-4 times lower than that of high-strength cement-based materials, so it is very important to combine high strength and high ductility into one cement-based material to expand the scope of application and ensure the resilience and stability of major structures. do.

Steel fibers, glass fibers, synthetic fibers, and natural fibers are used as reinforcing materials for fiber-reinforced cement-based materials. Among these, steel fibers and structural synthetic fibers account for most of the fibers used for structural reinforcement. Steel fibers can improve the compressive strength and toughness of cement-based materials with high stiffness and elastic modulus.

However, there are problems in that fibers are expensive, increase the unit weight of structural members, and when mixed with cement-based materials, fiber agglomeration occurs, which reduces workability.

In addition, steel fibers are highly corrosive, so there is a risk of deteriorating the overall performance of the structure. Structural synthetic fibers are being studied as alternative reinforcing materials to these steel fibers. Structural synthetic fibers are known to have properties similar to steel fibers, such as tensile strength, bending strength, bending toughness, and impact resistance. The use of structural fiber is increasing because it has excellent chemical resistance, does not cause corrosion, is easy to transport due to its small specific gravity, and is economically advantageous over steel fiber due to its small weight at the same fiber mixing ratio.

However, when two fibers with different physical and mechanical properties are mixed and used, there is a lack of research and development on technology that can effectively control cracks that occur in cement-based materials according to the characteristics of each fiber. In particular, there is a lack of research and development on the post-crack behavior of the structure and There was a lack of research and development on mechanical performance.

<Related prior art literature>

1. Republic of Korea Patent No. 10-1860503

2. Republic of Korea Patent No. 10-1856380

3. Republic of Korea Patent No. 10-1638084

4. Republic of Korea Patent No. 10-1881077

The present invention was developed in consideration of the situation of the prior art as described above. In the present invention, by including a high content of cement components, it has ultra-fast hardening properties and overcomes problems such as corrosion, construction, and economic efficiency of fiber-reinforced cement-based materials. To this end, we aim to provide a high-performance grout composition with high strength and high ductility using hybrid fibers that are a mixture of structural synthetic fibers and steel fibers.

In addition, we propose the optimal mixing ratio of high-strength, high-toughness, high-performance cement-based materials using hybrid fiber reinforcement, propose the optimal fiber mixing ratio through fluidity, filling, and compression experiments of the materials, and present performance evaluation results accordingly. do.

In addition, it exhibits high strength and high toughness performance and at the same time has excellent chemical resistance and corrosion resistance characteristics, making it suitable for use in structures requiring high strength and high toughness characteristics, such as high-rise buildings, dams, long-span bridges, etc., and at the same time, it is suitable for use in concrete structures. We aim to provide technology for high-performance grout compositions that can dramatically extend the lifespan.

In order to achieve the above problem, one embodiment of the present invention is

For 40 parts by weight of cement, 1 to 20 parts by weight of calcium carbonate, 1 to 15 parts by weight of fiber reinforcement, 1 to 10 parts by weight of high-performance water reducing agent, 0.1 to 10 parts by weight of fine quartz powder, and 1 to 10 parts by weight of calcium alumina sulfite (CSA). Provides an ultra-fast hardening, high-performance grout composition, which is composed of mixing 0.5 to 2.0 parts by weight of a shrinkage reducer, 0.1 to 1.0 parts by weight of an antifoaming agent, and 1 to 5 parts by weight of gypsum, and mixing aggregate and water.

In one embodiment of the present invention, the fiber reinforcement material is characterized by using a mixture of steel fibers and synthetic fibers in a ratio of 100:10 to 100.

At this time, the synthetic fiber is preferably at least one selected from polyester fiber, nylon fiber, polypropylene (PP) fiber, cellulose fiber, and polyethylene fiber.

In addition, in one embodiment of the present invention, the quartz fine powder is characterized in that it is obtained by applying a water-soluble resin to pulverized glass powder using a spray method, kneading it, and then firing it in a kiln.

At this time, the water-soluble resin is preferably EVA (Ethylene vinyl acetate copolymer) resin or acrylic resin.

In addition, in one embodiment of the present invention, 0.1 to 5 parts by weight of an anti-freeze adjuvant and 0.1 to 3 parts by weight of an organic-inorganic strength regulator are further included based on 40 parts by weight of the cement.

At this time, it is preferable to use the anti-locking aid consisting of 5 to 20 parts by weight of calcium formate, 1 to 10 parts by weight of propyl cellosolve, 0.1 to 5 parts by weight of caproic acid, and 0.1 to 5 parts by weight of urea.

In addition, the organic-inorganic strength modifier includes a resin component consisting of 10 to 20 parts by weight of SBR (Styrene-Butadiene rubber), 1 to 15 parts by weight of hydroxyl acrylate monomer, and 15 to 30 parts by weight of unsaturated polyester resin, and 2 to 2 parts by weight of titanium dioxide. It contains an inorganic component consisting of 5 parts by weight, 1 to 7 parts by weight of mica, and 1 to 10 parts by weight of diatomaceous earth, and the resin component forms a hollow sphere shape, and the inorganic component surrounds the resin component on the outside to form a bead shape. It is desirable to use what is achieved.

In addition, in order to achieve the above problem, another embodiment of the present invention is

A grout construction method using the ultra-fast hardening, high-performance grout composition according to the present invention is provided.

The ultra-fast hardening, high-performance grout composition according to the present invention is a cement mortar composition that has ultra-fast hardening properties due to its high content of cement, and simultaneously overcomes problems such as corrosion, construction, and economic efficiency by applying hybrid fibers that are a mixture of structural synthetic fibers and steel fibers. It can be applied to structures requiring high strength and high toughness, such as high-rise buildings, dams, long-span bridges, etc., as it exhibits high strength and high toughness performance by the optimal mixing ratio and has excellent chemical resistance and corrosion resistance characteristics. It is suitable for use, and at the same time, it has the effect of dramatically extending the lifespan of concrete structures.

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

As described above, the high-performance grout composition according to the present invention contains 1 to 20 parts by weight of calcium carbonate, 1 to 15 parts by weight of fiber reinforcement, 1 to 10 parts by weight of high-performance water reducing agent, and 0.1 to 10 parts by weight of quartz fine powder, based on 40 parts by weight of cement. It is characterized by mixing 1 to 10 parts by weight of calcium alumina sulfite (CSA), 0.5 to 2.0 parts by weight of shrinkage reducing agent, 0.1 to 1.0 parts by weight of antifoaming agent, and 1 to 5 parts by weight of gypsum, and mixing aggregate and water.

Below, each component constituting the high-performance grout composition according to the present invention will be described in detail.

First, in the present invention, the cement may be one type or a mixture of two or more types selected from ordinary Portland cement (OPC), slag cement, alumina cement, and ultra-fast hardening cement, and is preferably ordinary Portland cement. Specifically, in the case of Portland cement, the main ingredients are C ₃ S 51%, C ₂ S 25%, C ₃ A 9%, C ₄ AF 9%, and CaSO ₄ 4%, and the specific surface area is around 3,300 cm ² /g. It is desirable to use .

When mixed cement is used, it may include 40 to 70% by weight of Portland cement, 5 to 25% by weight of alumina cement, and the remaining amount of ultra-fast hardening cement.

Among these, alumina cement is a cement with a relatively high alumina content compared to ordinary Portland cement, has excellent chemical resistance, has the advantage of being usable in an acidic atmosphere, and is a type of early strength cement with a short curing time, which is comparable to ordinary Portland cement. Use as a ratio.

In addition, it is desirable to use a rapid hardening cement that contains anhydrous gypsum and more than 50% by weight of alumina or calcium sulfoaluminate (CSA) and has excellent initial adhesion.

In the present invention, the calcium carbonate is an inorganic performance enhancer and functions to improve physical performance such as wear resistance and durability.

In the present invention, the fiber reinforcement is effective in the initial stability of concrete by improving bending strength and tensile strength as well as reducing surface cracks during curing, and is used for the purpose of increasing initial dispersibility.

In particular, the fiber reinforcement material is a mixture of two or more fibers to maximize the improvement effect through fiber reinforcement, and can contribute to improving the performance of cement-based materials through the application of mixed fibers.

In other words, by using a mixture of two fibers with different physical and mechanical properties, cracks that occur in cement-based materials can be effectively controlled according to the characteristics of each fiber, demonstrating effects that cannot be achieved with single fiber reinforcement, and improving mechanical performance and durability. You can.

In the present invention, the hybrid fiber reinforcement material is applied by combining steel fibers and structural synthetic fibers, so that the advantages of the stable behavior after cracking of structural synthetic fibers and the high rigidity characteristics of steel fibers can be utilized together, and the advantages of reducing workability and cost are possible. there is.

In the present invention, the fiber reinforcement material is preferably a mixture of steel fibers and synthetic fibers in a ratio of 100:10 to 100.

If the ratio of synthetic fibers is less than the above ratio, the effect of compensating for brittleness and improving toughness may be reduced, and if it is more than the above ratio, the ratio of steel fibers may be relatively small, which may reduce the effect of reinforcing rigidity.

In the present invention, the steel fibers are dispersed within the high-performance grout composition and serve to suppress the expansion and propagation of multiple microcracks that occur when subjected to tensile stress through the crosslinking action of the fibers. In general, it is preferable to use steel fibers with a fiber length of 13 mm and a diameter of about 0.2 mm.

In the present invention, the synthetic fiber, that is, the structural synthetic fiber, can be used at least one selected from polyester fiber, nylon fiber, polypropylene (PP) fiber, cellulose fiber, and polyethylene fiber, and other glass fiber, carbon fiber, Some inorganic fibers such as basalt fibers can also be mixed and used.

In the present invention, the high-performance water reducing agent serves to secure fluidity and prevent durability deterioration by reducing the water-cement ratio, and polyacrylate-based, naphthalene-based, melamine-based, sulfonic acid-based, and polycarboxylic acid-based water reducing agents can be used. You can.

In the present invention, the quartz fine powder may be coated on the surface of pulverized glass powder using a water-soluble resin such as EVA (ethylene vinyl acetate copolymer) resin or acrylic resin. Glass powder can be used, for example, by finely pulverizing waste oil powder. Water-soluble resin can be sprayed on this pulverized material, kneaded into a paste, and then calcined using a kiln. At this time, the firing temperature is preferably carried out in a temperature range that forms a porous structure on the glass but does not decompose the water-soluble resin on the surface. After this firing, a sieving process may be further performed to separate by size.

The quartz fine powder has a porous interior due to firing treatment, but is characterized by having a core-shell double structure on the surface coated with a water-soluble resin.

The quartz fine powder has a shape close to a sphere through firing treatment, so although it is lightweight, the decline in physical properties such as strength and durability can be minimized. At the same time, although it has a porous structure, the water absorption rate is reduced by the surface resin coating, so the water ratio when mortar is used. It has the advantage of reducing (W/C), which improves workability and problems caused by excess water, and plays a role in improving fire resistance, chemical resistance, and durability through firing treatment.

In the present invention, when the calcium alumina sulfite (CSA) is mixed with water and hydrated, a phenomenon occurs that compensates for concrete shrinkage, thereby preventing cracking of the mortar and densifying the structure.

In the present invention, the shrinkage reducing agent preferably has a molecular weight of 100 or more and has two or more hydroxyl groups, for example, neopentyl glycol. The neopentyl glycol has two symmetrical alcohol groups and two methyl groups at the alpha carbon position, showing excellent reactivity in esterification reactions. In the present invention, the neopentyl glycol can be used in the form of flakes consisting of 100% white crystals or in the form of a slurry consisting of 90% neopentyl glycol and 10% water.

In the present invention, the antifoaming agent is an ingredient used to improve the strength and appearance of the mortar by removing macropores in the mortar. Generally, an oily substance or a water-soluble surfactant with low volatility and high diffusivity is used, for example, kerosene. , mineral oil-based defoamer such as liquid paraffin; Oil-based antifoaming agents such as animal and vegetable oils, sesame oil, castor oil and their alkylene oxide adducts; Fatty acid-based antifoaming agents such as oleic acid, stearic acid and their alkylene oxide adducts; Fatty acid ester-based antifoaming agents such as glycerin monoricinoleate, alkenyl succinic acid fluid, sorbitol monolaulate, sorbitol trioleate, natural wax, etc.; Polyoxyalkylenes, (poly)oxyalkyl ethers, acetylene ethers, (poly)oxyalkylene fatty acid esters, (poly)oxyalkylene sorbitan fatty acid esters, (poly)oxyalkylene alkyl (aryl) ethers Oxyalkylene-based antifoaming agents such as sulfuric acid ester salts, (poly)oxyalkylene alkyl phosphoric acid esters, (poly)oxyalkylene alkylamines, and (poly)oxyalkyleneamides; Alcohol-based antifoaming agents such as octyl alcohol, hexadecyl alcohol, acetylene alcohol, and glycols; Amide-based antifoaming agents such as acrylate polyamine; Phosphate ester-based antifoaming agents such as tributyl phosphate and sodium octyl phosphate; Metal soap-based antifoaming agents such as aluminum stearate and calcium oleate; Silicone-based antifoaming agents such as dimethyl silicone oil, silicone paste, silicone emulsion, organic modified polysiloxane (polyorganosiloxane such as dimethylpolysiloxane), and fluorosilicone oil can be used.

In the present invention, the gypsum destroys the acidic film of cement, accelerates the release of ions from inside the cement, reacts with them to produce a large amount of ettringite at the beginning of hydration, and generates calcium silicate hydrate with age. It plays a role in expressing strength.

In the present invention, the gypsum may be one type or a mixture of two or more types selected from anhydrous gypsum, flue gas desulfurization gypsum, petroleum coke desulfurization gypsum, and coal coke desulfurization gypsum.

In the present invention, the high-performance grout composition may optionally further include a polymer component, silica fume, and fly ash, and, if necessary, may further include additives such as a dispersant, a retarder, and an alkali activator.

In the present invention, the polymer serves to improve the physical properties of concrete by increasing compatibility and adhesion between internal components, and includes polyvinyl acetate, polyvinyl acetate silane-terminated polymer, polyvinyl alcohol, and polyvinyl ester silane-terminated polymer. , one or more types selected from methyl methacrylate-butyl acrylate and styrene-butadiene rubber latex can be used, preferably selected from polyvinylacetate, polyvinyl alcohol, methyl methacrylate-butyl acrylate, and styrene-butadiene rubber latex. More than one type can be used. In the present invention, the amount of the polymer used is preferably in the range of 1 to 10 parts by weight based on 100 parts by weight of the cement.

The silica fume is an amorphous active silica that is a completely spherical particle with an average particle size of about 0.1 to 0.5 mm. It reacts with calcium hydroxide and changes into hydrous calcium silicate at room temperature as shown in the chemical formula below, giving it super-pozzolanic properties.

3CaOSiO ₂ + H ₂ O → CSH (cement gel) + Ca(OH) ₂

The reason for adding the silica fume in the present invention is to improve dispersibility and water-reducing effect due to the ball bearing effect of spherical particles, improve water tightness and increase strength due to the filling effect of silica fume between cement particles, and increase ground volume by improving adhesion. This is because it has effects such as reducing alkali silica reaction, suppressing alkali silica reaction, and improving chemical resistance.

Specifically, the silica fume forms the secondary hydration product C-S-H through a pozzolanic reaction with calcium hydroxide, the primary hydration product, thereby improving the density of the material and greatly increasing strength and durability. Silica fume, which has a spherical particle shape, plays a role in improving the fluidity of the mix through lubricating effects such as a ball bearing effect that reduces inter-particle friction between other particles and a plasticizer effect that reduces viscosity or plasticity.

In the present invention, fly ash is a fine powder that is currently classified as an industrial by-product and is a fine particle collected in an electric dust collector after combustion in a pulverized coal combustion boiler of a coal-fired power plant. This type of fly ash has a lower specific gravity than ordinary Portland cement and has a glassy structure, so it can secure fluidity and has functions such as reducing heat of hydration and controlling temperature cracking due to pozzolanic reaction. In the present invention, the amount of fly ash used is preferably in the range of 0.1 to 10 parts by weight based on 100 parts by weight of the cement.

The dispersant adsorbs to the particle surface of the mortar and gives an electric charge to the particle surface, causing mutual repulsion between the particles, thereby dispersing the aggregated particles to increase flow, thereby improving strength due to the water-reducing effect. As the dispersant, a conventional water reducing agent can be used, for example, it can be used alone or in combination of two or more from the group consisting of lignin sulfonate, polynaphthalene sulfonate, polymelamine sulfonate, or polycarboxylate water reducing agents.

The retardant may be added to adjust the hydration rate of the mortar to ensure workability for a certain period of time. Retardants include boric acid, borax, sodium borate, potassium borate, gluconic acid, citric acid, tartaric acid, glucoheptonic acid, arabonic acid, malic acid, or citric acid, and their sodium, potassium, calcium, magnesium, ammonium, and triethanolamine. oxycarboxylic acids such as inorganic salts or organic salts; Monosaccharides such as glucose, fructose, galactose, saccharose, xylose, abitose, lipose, and isomerized sugars, oligosaccharides such as di- and trisaccharides, oligosaccharides such as dextrin, or polysaccharides such as dextran, Sugars such as molasses containing these; Sugar alcohols such as sorbitol; magnesium silicofluoride; Phosphoric acid and its salts or boric acid esters; Aminocarboxylic acids and their salts; alkaline soluble protein; fumic acid; tannic acid; phenol; polyhydric alcohols such as glycerin; Aminotri(methylenephosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, ethylenediaminetetra(methylenephosphonic acid), diethylenetriaminepenta(methylenephosphonic acid) and their alkali metal salts, alkalis. Phosphonic acid and its derivatives such as earth metal salts can be used.

The alkaline activator is a component that affects strength development, and may be one or a mixture of two or more selected from alkali metal hydroxides, chlorides, sulfur oxides, and carbonates, and preferably sodium carbonate and sodium hydrogen carbonate. It is advantageous in terms of strength development.

In the present invention, silica sand may be used as the aggregate, and lightweight aggregate may also be used. As the lightweight aggregate, it is preferable to use porous lightweight aggregate with an average diameter of 50 to 200㎛ and an absolute dry specific gravity of 0.7 to 1.4. Specifically, it is preferable to use porous phyllite as the lightweight aggregate, and the water ratio of the porous phyllite-based lightweight aggregate may increase due to its porosity. In the present invention, the content of the aggregate can be adjusted as needed, and this is not specifically limited.

In addition, in the present invention, the high-performance grout composition may additionally include an anti-static auxiliary agent and an organic-inorganic strength regulator to improve the functionality of the concrete structure manufactured using the same.

Specifically, it may further include 0.1 to 5 parts by weight of an anti-freeze adjuvant and 0.1 to 3 parts by weight of an organic-inorganic strength regulator based on 100 parts by weight of the cement.

In the present invention, the anti-freeze adjuvant is used to improve cold resistance, and specifically, 5 to 20 parts by weight of calcium formate, 1 to 10 parts by weight of propyl cellosolve, 0.1 to 5 parts by weight of caproic acid, and 0.1 to 5 parts by weight of urea. You can use what has been done.

The potassium formate is a raw material that provides an anti-static effect and also has the characteristic of providing a strength improvement effect.

In addition, the propyl cellosolve improves lubricating properties and immobility, prevents frost damage, and improves workability.

In addition, the caproic acid promotes the hydration reaction of cement and reacts with calcium hydroxide of cement to make the structure of the cement paste dense, thereby improving physical properties, exhibiting a rust prevention effect, and improving cold resistance.

In addition, the urea is non-salted and alkali-free, dissolves in water, exerts a freezing point strengthening effect, and exhibits a hardening acceleration function together with caproic acid to provide anti-freeze performance.

In the present invention, the organic-inorganic strength regulator is a resin component consisting of 10 to 20 parts by weight of SBR (Styrene-Butadiene rubber), 1 to 15 parts by weight of hydroxyl acrylate monomer, and 15 to 30 parts by weight of unsaturated polyester resin, and titanium dioxide 2. It contains an inorganic component consisting of ~5 parts by weight, 1-7 parts by weight of mica, and 1-10 parts by weight of diatomaceous earth, and the resin component forms a hollow sphere shape, and the inorganic component surrounds the resin component on the outside to form a bead shape. It is desirable to use something that achieves .

In the present invention, it is preferable to use a resin with a solid content of 50% or more for the SBR rubber to maintain elasticity. The solvent may be an ethylene glycol-based dihydric alcohol.

In addition, the hydroxyl acrylate monomer functions to assist rubber performance and ensure long-term performance. Such hydroxyl acrylate monomers include hydroxyl ethyl acrylate, hydroxyl propyl acrylate, and hydroxyl ethylmethyl acrylate.

The unsaturated polyester is formed by condensation polymerization of an acid and a glycol-type compound, and for example, it can be used as an acid value in the range of 18 to 20 mg/KOH, which is formed by the reaction of fumaric acid and diethylene glycol. The unsaturated polyester serves to enhance durability.

In the present invention, titanium dioxide is used to improve durability.

In the present invention, the mica functions to improve water resistance and durability.

In the present invention, the diatomaceous earth functions to improve condensation prevention properties and adhesion.

In the present invention, the resin component exerts heat resistance performance, and the inorganic component surrounds the resin component from the outside to make the structure dense and increase durability.

The concrete composition according to the present invention obtained as described above can be used for grout construction of concrete structures.

In the present invention, concrete structures that can be applied to the grout construction include, for example, structures requiring high strength such as high-rise buildings, dams, long-span bridges, etc. or piers, underwater structures or coastal structures, power conduits, PHC piles, etc. It can be used without limitation, and in particular, when used in structures that can be damaged by salt water or contaminated water, physical properties such as water resistance and chemical resistance can be improved, which has the effect of dramatically improving durability.

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

[Example]

(Preparation Example 1) Preparation of high-performance grout composition

Portland cement (OPC) 40 parts by weight, calcium carbonate 5.0 parts by weight, mixed fiber reinforcement (steel fiber and polypropylene mixed at a weight ratio of 100:50) 7 parts by weight, high performance water reducing agent (polyacrylate type) 1.2 weight 2.0 parts by weight of fine quartz powder obtained by processing glass powder, 1.5 parts by weight of calcium alumina sulfite, 1.0 parts by weight of neopentyl glycol shrinkage reducing agent, 0.3 parts by weight of antifoaming agent, and 4 parts by weight of gypsum (anhydrous gypsum) with an appropriate amount of water. A mortar composition (high-performance grout composition) was prepared by uniformly mixing 250 parts by weight of aggregate (ground sand with an average particle diameter of 0.5 mm or less).

(Preparation Example 2) Preparation of concrete composition

Portland cement (OPC) 40 parts by weight, calcium carbonate 8.0 parts by weight, mixed fiber reinforcement (steel fiber and polypropylene mixed at a weight ratio of 100:100) 5 parts by weight, high performance water reducing agent (polyacrylate type) 1.8 weight 3.0 parts by weight of fine quartz powder obtained by processing glass powder, 1.8 parts by weight of calcium alumina sulfite, 1.5 parts by weight of neopentyl glycol shrinkage reducer, 0.3 parts by weight of antifoaming agent, and 4 parts by weight of gypsum (flue gas desulfurized gypsum) with an appropriate amount of water. A mortar composition (high-performance grout composition) was prepared by uniformly mixing 200 parts by weight of aggregate (porous fillite with an average diameter of about 100㎛ and absolute dry gravity of 0.9).

(Comparative Manufacturing Example 1)

Portland cement (OPC) 40 parts by weight, fly ash 3.0 parts by weight, steel fiber 5 parts by weight, high performance water reducing agent (polyacrylate type) 1.2 parts by weight, calcium alumina sulfite 1.5 parts by weight, shrinkage reducer 1.0 parts by weight, antifoamer 0.3 parts by weight A mortar composition was prepared by uniformly mixing 4 parts by weight of gypsum with an appropriate amount of water and 250 parts by weight of aggregate (ground sand with an average particle diameter of 0.5 mm or less).

(Comparative Manufacturing Example 2)

Portland cement (OPC) 40 parts by weight, silica fume 3.0 parts by weight, polypropylene fiber 5 parts by weight, high performance water reducing agent (polyacrylate type) 1.8 parts by weight, calcium alumina sulfite 1.8 parts by weight, shrinkage reducing agent 1.5 parts by weight, A mortar composition was prepared by uniformly mixing 0.3 parts by weight of antifoaming agent and 4 parts by weight of gypsum with an appropriate amount of water, and 200 parts by weight of aggregate (ground sand with an average particle diameter of 0.5 mm or less) was uniformly mixed.

(Comparative Manufacturing Example 3)

Similar to the method proposed in Korean Patent No. 10-1860503, 13 parts by weight of cement, 4.5 parts by weight of blast furnace slag fine powder, 1.5 parts by weight of bottom ash fine powder, 0.2 parts by weight of caustic soda, 15 parts by weight of silica sand, 35 parts by weight of stone dust. A concrete composition was prepared by mixing 1.0 parts by weight of phosphate, 35 parts by weight of fine aggregate, and water.

performance evaluation

(1) Physical properties of concrete composition

Test specimens were prepared using the compositions in the above Examples and Comparative Examples, and the physical properties were measured using the following test method.

1) Setting time: KSF 2436

2) Bending strength: KS F 2476

3) Compressive strength: KSF 2405

4) Flexural toughness: KS F 2476

5) Length change rate: Measured according to KS F 2424 concrete length change test method. The value is set as 0 for the initial construction material, with "-" indicating the shrinkage rate and "+" indicating the expansion rate.

6) Flow: Conducted in accordance with KS L 5220

The results are shown in Table 1 below.

item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Setting time (minutes) first decision 18 19 29 33 45 closing 25 29 40 39 69 Bending strength (MPa) gin 5.27 4.70 3.25 3.31 2.90 Compressive strength (MPa) gin 19.28 14.82 11.23 10.29 9.95 Flexural toughness (MPa) gin 15.11 15.82 12.32 10.21 11.20 Length change rate (%) +0.01 +0.02 +0.01 +0.02 +0.15 Flow (mm) 246 255 220 230 175

As seen in the table above, the mortar composition according to the present invention has significantly superior physical properties compared to the comparative example, and in particular, it can be seen that the compressive strength, bending strength, and bending toughness along with the initial hardening properties are significantly improved. .

(2) Other performance evaluations

1) Weather resistance evaluation

Measurement was conducted for 400 hours according to ASTM G 155.

2) Surface hardness evaluation

Pencil hardness was measured according to KS D 6711.

3) Water resistance evaluation

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

The evaluation results are shown in Table 2.

Weather resistance (white) surface hardness water resistance Example 1 △E2.0 5H 480hrs Example 2 △E2.0 4H 450hrs Comparative Example 1 △E2.7 3H 400hrs Comparative Example 2 △E2.7 3H 350hrs Comparative Example 3 △E3.5 2H 330hrs

From the results in Table 2 above, the mortar composition according to the present invention has excellent physical properties such as weather resistance, water resistance, and surface hardness, so the quality can be further improved compared to the conventional method when manufacturing concrete structures. Accordingly, it can be used for water pipes and other uses. It is expected that manufacturing precast products will increase their lifespan.

The present invention is not limited to the specific embodiments described above, and various modifications and modifications can be made by anyone skilled in the art without departing from the gist of the invention as set forth in the claims. , such changes shall be construed as falling within the scope of the appended claims.

Claims (9)

For 40 parts by weight of cement, 1 to 20 parts by weight of calcium carbonate, 1 to 15 parts by weight of fiber reinforcement, 1 to 10 parts by weight of high-performance water reducing agent, 0.1 to 10 parts by weight of fine quartz powder, and 1 to 10 parts by weight of calcium alumina sulfite (CSA). An ultra-fast, high-performance grout composition characterized by mixing 0.5 to 2.0 parts by weight of a shrinkage reducer, 0.1 to 1.0 parts by weight of an antifoaming agent, and 1 to 5 parts by weight of gypsum, and mixing aggregate and water.
The ultra-fast hardening, high-performance grout composition according to claim 1, wherein the fiber reinforcement is a mixture of steel fibers and synthetic fibers in a ratio of 100:10 to 100.
The ultra-fast hardening, high-performance grout composition according to claim 2, wherein the synthetic fiber is at least one selected from polyester fiber, nylon fiber, polypropylene (PP) fiber, cellulose fiber, and polyethylene fiber.
The ultra-fast hardening, high-performance grout composition according to claim 1, wherein the quartz fine powder is obtained by applying a water-soluble resin to pulverized glass powder using a spray method, kneading the mixture, and then firing it in a kiln.
The ultra-fast hardening, high-performance grout composition according to claim 4, wherein the water-soluble resin is an EVA (Ethylene vinyl acetate copolymer) resin or an acrylic resin.
The ultra-fast hardening, high-performance grout composition according to claim 1, further comprising 0.1 to 5 parts by weight of an anti-static adjuvant and 0.1 to 3 parts by weight of an organic-inorganic strength regulator based on 40 parts by weight of the cement.
In claim 6,
An ultra-fast hardening, high-performance grout composition, characterized in that the anti-static aid is composed of 5 to 20 parts by weight of calcium formate, 1 to 10 parts by weight of propyl cellosolve, 0.1 to 5 parts by weight of caproic acid, and 0.1 to 5 parts by weight of urea.
In claim 6,
The organic-inorganic strength regulator is a resin component consisting of 10 to 20 parts by weight of SBR (Styrene-Butadiene rubber), 1 to 15 parts by weight of hydroxyl acrylate monomer, and 15 to 30 parts by weight of unsaturated polyester resin, and 2 to 5 parts by weight of titanium dioxide. parts, 1 to 7 parts by weight of mica, and 1 to 10 parts by weight of diatomaceous earth, wherein the resin component forms a hollow sphere shape, and the inorganic component surrounds the resin component on the outside to form a bead shape. An ultra-fast, high-performance grout composition characterized in that it is used.
A grout construction method using the ultra-fast hardening, high-performance grout composition of any one of claims 1 to 8.