KR102460125B1 - Quick-hardening and early strength cement concrete composition having excellent crack resistance and repairing method for road pavement using the same - Google Patents

Abstract

The present invention is to provide an ultra-rapid-hardening and ultra-high-early-strength cement concrete composition with excellent crack resistance performance and a road pavement maintenance method using the same. The ultra-rapid-hardening and ultra-high-early-strength cement concrete composition comprises 20 to 50 wt% of fine aggregate, 10 to 40 wt% of coarse aggregate, 10 to 40 wt% of a functional improvement binder, 0.5 to 20 wt% of a functional improvement admixture, and 0.1 to 5 weight% of water. The functional improvement binder includes 100 parts by weight of early-strength Portland cement, 20 to 40 parts by weight of calcium sulfoaluminate, 1 to 20 parts by weight of potassium magnesium titanate, 1 to 20 parts by weight of silicon manganese slag, 0.1 to 10 parts by weight of lepidocrocite, 0.1 to 10 parts by weight of astaxanthin, 0.1 to 10 parts by weight of spicule, and 0.1 to 10 parts by weight of cobalt sulfate. The functional improvement admixture includes 100 parts by weight of acrylic latex, 70 to 90 parts by weight of an acrylonitrile-butadiene-styrene copolymer, 70 to 90 parts by weight of a methyl methacrylate-maleic anhydride copolymer, 10 to 30 parts by weight of polyamideimide resin, 10 to 30 parts by weight of styrene-maleimide copolymer, 0.1 to 10 parts by weight of thiophosphate ester, and 0.1 to 10 parts by weight of luteolinidin glycoside. Therefore, the present invention can ensure short-time hardening, initial strength, and physical properties when damaged concrete structures are repaired. In particular, the present invention can prevent cracking and expansion failure, and at the same time, has excellent resistance to freeze-thaw and salt damage, which can improve long-term durability.

Description

QUICK-HARDENING AND EARLY STRENGTH CEMENT CONCRETE COMPOSITION HAVING EXCELLENT CRACK RESISTANCE AND REPAIRING METHOD FOR ROAD PAVEMENT USING THE SAME

The present invention can secure hardening, initial strength and physical properties in a short time during maintenance of damaged concrete structures, and can prevent cracking and expansion and destruction phenomena, and at the same time improve long-term durability due to excellent resistance to freeze-thaw and salt damage. It relates to a super-velocity and super-strength cement concrete composition having excellent crack resistance performance and a road pavement maintenance method using the same.

Since the beginning of road construction in Korea, road construction has been mainly done by asphalt concrete pavement (hereinafter referred to as 'asphalt pavement'). However, as the scale of industry and economy expanded, vehicles, a means of transportation, gradually became larger and heavier, which resulted in a sharp shortening of the pavement lifespan. At the same time, interest in cement concrete pavement (hereinafter referred to as 'concrete pavement') has been increased in terms of the relative increase in pavement construction costs and the utilization of existing resources due to repeated oil surges. there is a trend

In road pavement, the bearing capacity of the pavement is lowered due to the spongy phenomenon occurring under the pavement layer due to the expansion and contraction and expansion of the pavement according to the temperature change, and the cracks occur frequently due to the load of vehicles, etc. do. When a crack occurs in the pavement layer, rainwater penetrates through the gap, the damaged part of the road rapidly expands, and the crack progresses due to the load of a vehicle running on the road, so prompt repair is required.

In addition, concrete structures, especially bridge concrete slabs, road surfaces, wing walls, road gutter, bridge lower parts, and piers, cracks due to deterioration, and as time goes by, the compressive strength of concrete and the tensile strength of reinforcing bars gradually decrease. In concrete exposed through cracks, chloride ion penetration, freezing and thawing, and neutralization progress, causing corrosion of reinforcing bars. If the corrosion of the reinforcing bars becomes severe, the concrete structure may eventually collapse.

In general, concrete roads were repaired by removing damaged parts and using road pavement repair methods such as repaving. This repair method is advantageous in terms of the durability of the repair part, but the repaved road also has a step difference between the first paved part and the repaired part, giving an impact to the driving vehicle, or the repaved concrete is hardened and required. There was a problem in that the passage of the vehicle had to be restricted for a certain period of time because it had to be cured for a certain period in order to express the strength of the vehicle.

In order to solve this problem, an emergency repair method of concrete road pavement using super-velocity cement concrete mixed with polymer and super-velocity cement is mainly used. More specifically, Latex Modified Concrete, which forms a watertight structure by adding SBR (Styrene-Butadiene Rubber) latex to general concrete in the early 2000s, has been developed and used. More specifically, Korean Patent Registration No. 10-0421255 describes a technique of using latex-modified concrete in which SBR (styrene-butadiene rubber) latex is added for concrete repair and reinforcement work.

However, in the above technology, SBR latex is specified only for bridge pavement of new bridges, and the latex is specialized for general portland cement (class 1 cement). It is difficult to use, the material cost is high due to the high content of cement and polymer, and the performance is also limited in maintaining the adhesion strength between the deteriorated or neutralized gas concrete and the latex-modified concrete for repair.

In addition, in the case of using the modified super-velocity concrete to which SBR latex is added, chloride penetration resistance or freeze-thaw stability in the winter season is low, so after the winter season, the surface peeling of the latex-modified concrete, partial damage and dropping, porthole generation and drying shrinkage and relaxation stress There was a problem in that cracks occurred due to the

Accordingly, in order to improve the performance degradation caused by the use of the SBR latex, a method containing a high-performance latex-modified polymer has been proposed, but there is still a limit to its practical application, so more various trials and research and development are required.

Korean Patent Registration No. 10-0421255 Korean Patent Registration No. 10-2133431

The present invention has been devised to solve the above-described problems, and an embodiment of the present invention enables hardening, initial strength and physical properties to be secured in a short time during maintenance of damaged concrete structures, and in particular, it is possible to prevent cracking and expansion destruction. An object of the present invention is to provide a super-velocity and ultra-hard cement concrete composition with excellent crack resistance that can improve long-term durability due to its excellent resistance to freeze-thaw and salt damage, and a road pavement maintenance method using the same.

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

One embodiment of the present invention comprises 20 to 50% by weight of fine aggregate, 10 to 40% by weight of coarse aggregate, 10 to 40% by weight of a functional improving binder, 0.5 to 20% by weight of an improving admixture and 0.1 to 5% by weight of water;

The function-improving binder includes 100 parts by weight of crude steel portland cement, 20 to 40 parts by weight of calcium sulfoaluminate, 1 to 20 parts by weight of potassium magnesium titanate, 1 to 20 parts by weight of silicon manganese slag, 0.1 to 10 parts by weight of lepidochrosite, 0.1 to 10 parts by weight of astaxanthin, 0.1 to 10 parts by weight of spicule, and 0.1 to 10 parts by weight of cobalt sulfate;

The function-improving admixture is 100 parts by weight of acrylic latex, 70 to 90 parts by weight of acrylonitrile-butadiene-styrene copolymer, 70 to 90 parts by weight of methyl methacrylate-maleic anhydride copolymer, 10 to 30 parts by weight of polyamideimide resin , a styrene-maleimide copolymer 10 to 30 parts by weight, 0.1 to 10 parts by weight of thiophosphate, and 0.1 to 10 parts by weight of luteolinidine glycoside. to provide.

The polyamide-imide resin is obtained by copolymerizing an aromatic diamine monomer, an aromatic dianhydride monomer and an aromatic carbonyl monomer in an inert atmosphere,

The aromatic carbonyl monomer is 10 to 20 mol% of isophthaloyl chloride, 75 to 85 mol% of terephthaloyl chloride and 0.01 to 5 mol% of trimesoyl chloride ) containing

It may contain 90 to 99.5 mol% of the aromatic diamine monomer based on the total moles of the aromatic dianhydride monomer and the aromatic carbonyl monomer.

The styrene-maleimide copolymer may have a glass transition temperature (Tg) of 150 to 200° C. and may be an N-phenyl maleimide-styrene-maleic anhydride copolymer.

The spicule is a needle-shaped Spongilla lacustris spicule whose surface is modified to be hydrophilic;

The needle-shaped Spongilla lacustris spicule, whose surface is modified to be hydrophilic, is

Supporting the crushed Spongilla lacustris with hydrochloric acid solution, and then heating and sonicating by adding hydrogen peroxide to extract Spongilla lacustris spicules;

After supporting the extracted Spongilla lacustris spicules in hydrochloric acid solution, washing with phosphate buffered saline to neutralize the acidity and drying to obtain a needle-shaped Spongilla lacustris spicules;

forming pores on the surface of the needle-shaped Spongilla lacustris spicule by reacting the needle-shaped Spongilla lacustris spicule and hydrogen peroxide for 6 to 20 hours; and

It may be prepared by a manufacturing method comprising the step of modifying the surface to be hydrophilic by reacting a basic compound with a needle-shaped Spongilla lacustris spicule having pores formed on the surface.

In addition, another embodiment of the present invention is a road pavement maintenance method using an ultra-fast diameter and ultra-steel cement concrete composition having excellent crack resistance performance,

removing the deteriorated, damaged or contaminated parts of the construction target surface; cleaning the removed area; Primer or blooming treatment on the cleaned area; pouring the super-velocity and super-strength cement concrete composition having excellent crack resistance performance on the primer or blooming-treated upper part; After pouring, tinting to increase crack induction and slip resistance; Spraying a curing agent to prevent initial plastic cracking by preventing evaporation of moisture in the upper part after the tinting step; And it provides a road pavement maintenance method comprising the step of curing.

According to the super-velocity and super-strength cement concrete composition having excellent crack resistance performance according to an embodiment of the present invention and the road pavement maintenance method using the same, the effect of accelerating the initial hydration of cement and densification of the internal structure is remarkably increased, In particular, since it is possible to secure initial strength after application, the work time can be dramatically shortened, which has the effect of greatly shortening the construction period and minimizing the traffic control time.

In addition, physical properties such as adhesion performance, flexural strength and compressive strength are further strengthened, and long-term storage stability is excellent. It has the effect of being able to maintain the repair and reinforcement effect for a long time as the resistance is improved remarkably.

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

One embodiment of the present invention comprises 20 to 50% by weight of fine aggregate, 10 to 40% by weight of coarse aggregate, 10 to 40% by weight of a functional improving binder, 0.5 to 20% by weight of an improving admixture and 0.1 to 5% by weight of water;

The function-improving binder includes 100 parts by weight of crude steel portland cement, 20 to 40 parts by weight of calcium sulfoaluminate, 1 to 20 parts by weight of potassium magnesium titanate, 1 to 20 parts by weight of silicon manganese slag, 0.1 to 10 parts by weight of lepidochrosite, 0.1 to 10 parts by weight of astaxanthin, 0.1 to 10 parts by weight of spicule, and 0.1 to 10 parts by weight of cobalt sulfate;

The function-improving admixture is 100 parts by weight of acrylic latex, 70 to 90 parts by weight of acrylonitrile-butadiene-styrene copolymer, 70 to 90 parts by weight of methyl methacrylate-maleic anhydride copolymer, 10 to 30 parts by weight of polyamideimide resin , a styrene-maleimide copolymer 10 to 30 parts by weight, 0.1 to 10 parts by weight of thiophosphate, and 0.1 to 10 parts by weight of luteolinidine glycoside. to provide.

According to the super-velocity and super-strength cement concrete composition having excellent crack resistance performance according to an embodiment of the present invention, and the road pavement maintenance method using the same, the effect of accelerating initial hydration of cement and densification of internal tissue is remarkably increased, In particular, since it is possible to secure initial strength after application, the work time can be dramatically shortened, which has the effect of greatly shortening the construction period and minimizing the traffic control time.

In addition, physical properties such as adhesion performance, flexural strength and compressive strength are further strengthened, and long-term storage stability is excellent. It has the effect of being able to maintain the repair and reinforcement effect for a long time as the resistance is improved remarkably.

The super-velocity cement concrete composition with excellent crack resistance performance according to an embodiment of the present invention contains 20 to 50% by weight of fine aggregate, 10 to 40% by weight of coarse aggregate, 10 to 40% by weight of functional improvement binder, and 0.5% by weight of functional improving admixture. to 20% by weight and 0.1 to 5% by weight of water.

The aggregate used in the present invention is divided into fine aggregate and coarse aggregate. Those having a particle diameter of 5 mm or less are called fine aggregates, and those having a particle diameter greater than 5 mm are called coarse aggregates. The fine aggregate is preferably contained in an amount of 20 to 50% by weight based on the super-velocity cement concrete composition having excellent crack resistance performance of the present invention, and the coarse aggregate is excellent in crack resistance performance of the present invention. It is preferably contained in an amount of 10 to 40% by weight.

The function-improving binder used in the present invention is preferably contained in an amount of 10 to 40% by weight based on the super-fast and super-strength cement concrete composition having excellent crack resistance performance of the present invention. When the content of the functional improvement binder is too small, the possibility of insufficient viscosity and bleeding may increase, and thus the possibility of occurrence of plastic cracks may also increase. In addition, the permeability resistance may decrease due to deterioration of the strength and watertightness of concrete. In addition, when the content of the functional improvement binder is too large, the viscosity increases, workability decreases, it becomes difficult to control the pot life, the initial strength decreases, and the long-term strength continues to increase due to excessive watertightness increase, so that concrete structures and pavements Dry shrinkage cracking of the sieve may occur.

The function-improving binder includes 100 parts by weight of crude steel portland cement, 20 to 40 parts by weight of calcium sulfoaluminate, 1 to 20 parts by weight of potassium magnesium titanate, 1 to 20 parts by weight of silicon manganese slag, 0.1 to 10 parts by weight of lepidochrosite, 0.1 to 10 parts by weight of astaxanthin, 0.1 to 10 parts by weight of spicule, and 0.1 to 10 parts by weight of cobalt sulfate may be used.

It is preferable to use the crude Portland cement specified in KS, and it is preferable to use a fineness of 4,500 to 9,000 cm2/g.

The calcium sulfoaluminate functions to provide fast curing properties.

The calcium sulfoaluminate is preferably contained in an amount of 20 to 40 parts by weight based on 100 parts by weight of the crude Portland cement. When the content of the calcium sulfoaluminate is too small, there is a problem that the above improvement effect may be insufficient. There is a problem in that price competitiveness may be lowered.

The potassium magnesium titanate can work together with the existing concrete structure and protect the sphere with excellent watertightness, thereby improving excellent waterproofness, water resistance, chemical resistance, acid resistance, durability, salt damage resistance, neutralization resistance, abrasion resistance, non-combustibility and strength. function.

The potassium magnesium titanate is a mixture of a titanium oxide source, a potassium oxide source and a magnesium oxide source in a weight ratio of 70 to 80: 15 to 25: 5 to 15, melted at a temperature of 1300 to 1500° C., cooled, and average particle diameter The above-described effect can be further improved by using the one prepared by pulverizing so as to have a thickness of 1 to 30 µm.

In this case, the titanium oxide source is at least one selected from the group consisting of natural rutile, synthetic rutile, synthetic anatase, and mixtures thereof having a TiO ₂ content of 95 to 100% by weight; The potassium oxide source is that the content of potassium carbonate is 95 to 100% by weight; The magnesium oxide source may preferably be used in an amount of 95 to 100% by weight of magnesium oxide.

The potassium magnesium titanate is preferably contained in an amount of 10 to 20 parts by weight based on 100 parts by weight of the ultrafine silicate. When the content of the potassium magnesium titanate is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the potassium magnesium titanate is too large, the performance is improved, but workability and price competitiveness may be lowered. There is this.

The silicon manganese slag functions to improve stable long-term strength expression and water tightness, provide microcrack prevention and shrinkage prevention effects by lowering the heat of hydration, and improve chemical durability to provide excellent salt damage and freeze-thaw resistance.

More specifically, the silicon manganese slag is silicon oxide (SiO ₂ ) 30 to 42 wt%, aluminum oxide (Al ₂ O ₃ ) 12 to 24 wt%, calcium oxide (CaO) 12 to 24 wt%, magnesium oxide (MgO) 3 to 9% by weight and 14 to 20% by weight of manganese oxide (MnO) may be used more preferably, and a fineness of 3,500 to 8,000 cm 2 /g may be preferably used.

The silicon manganese slag is preferably contained in an amount of 1 to 20 parts by weight based on 100 parts by weight of the crude steel portland cement. When the content of the silicon manganese slag is too small, there is a problem that the above-mentioned improvement effect may be insufficient, and when the content of the silicon manganese slag is too large, there is a problem that the initial strength expression may be delayed.

The lepidocrosite is an iron oxide-based compound, and it functions to exhibit excellent strength, prevent shrinkage and improve abrasion resistance, and assist in fast curing properties, thereby exhibiting super-fast hardness.

More specifically, the lepidochrosite may be used to have a specific surface area of 50 to 200 g/m ² to further enhance the above-described effect.

The lepidocrosite is preferably contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the crude Portland cement. When the content of the lepidochrosite is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the lepidocrosite is too large, there is a problem that the manufacturing cost increases and the price competitiveness may decrease. .

The astaxanthin very effectively prevents the shrinkage and microcracks of concrete by making the structure dense, and provides excellent corrosion resistance, and functions to greatly improve salt damage resistance and chemical resistance. In addition, it functions to provide fast curing properties.

It is preferable to purchase and use such astaxanthin commercialized as a component extracted from hematococcus, a seaweed.

The astaxanthin is preferably contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the crude Portland cement. When the content of astaxanthin is too small, there is a problem that the improvement effect may be insufficient, and when the content of astaxanthin is too large, there is a problem that price competitiveness may be lowered.

The spicule functions to improve resistance to salt damage and freeze-thaw, and to provide heat resistance, abrasion resistance, microcrack prevention and shrinkage prevention effects along with an excellent strength expression effect.

More specifically, the spicule has the effect of further improving the above-described effect by using a needle-shaped Spongilla lacustris spicule whose surface is modified to be hydrophilic.

The needle-shaped Spongilla lacustris spicules modified with hydrophilicity of the surface were supported by crushed Spongilla lacustris spicules with hydrochloric acid solution, and then heated and sonicated by adding hydrogen peroxide to obtain Spongilla lacustris spicules. extracting; After supporting the extracted Spongilla lacustris spicules in hydrochloric acid solution, washing with phosphate buffered saline to neutralize the acidity and drying to obtain a needle-shaped Spongilla lacustris spicules; forming pores on the surface of the needle-shaped Spongilla lacustris spicule by reacting the needle-shaped Spongilla lacustris spicule and hydrogen peroxide for 6 to 20 hours; and reacting the needle-shaped Spongilla lacustris spicule having pores on the surface with a basic compound to modify the surface to be hydrophilic.

At this time, the basic compound is generally known in the art, and the type thereof is not particularly limited, but calcium hydroxide (Ca(OH) ₂ ) at a concentration of 3 to 7 N and magnesium hydroxide (Mg(OH) at a concentration of 3 to 7 N) ) ₂ ) is mixed in a volume ratio of 1: 0.1 to 0.5, and excellent long-term strength improvement effect can be obtained.

The spicule is preferably contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the crude Portland cement. When the content of the spicule is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the spicule is too large, there is a problem that the manufacturing cost increases and the price competitiveness may decrease.

The cobalt sulfide functions to exhibit excellent high strength properties and shrinkage reduction effects as well as fast curing properties. In addition, by improving abrasion resistance, corrosion resistance, chemical resistance and chemical resistance, it functions to provide very improved durability such as salt penetration resistance and freeze-thaw resistance.

The cobalt sulfide step of preparing a mixed solution of cobalt chloride hexahydrate (Cobalt (ll) chloride hexahydrate), fatty acid, the first amine-based compound and a non-polar solvent; preparing a mixture by heat-treating the mixed solution at a temperature of 100 to 120° C. in an inert gas; A reaction step of reacting a solution in which sulfur in powder form in a second amine-based compound is stirred in the mixture at a reaction temperature of 250 to 300 °C; and centrifuging the material produced through the reaction step with a mixed solution of ethanol and toluene;

In this case, the fatty acid may include an unsaturated fatty acid and a saturated fatty acid. The unsaturated fatty acid may be a fatty acid having one or more double or triple bonds. More specifically, the unsaturated fatty acid may be at least one selected from the group consisting of oleic acid, linoleic acid, linolenic acid, arachidonic acid, and mixtures thereof. doesn't happen In addition, the saturated fatty acid is propanoic acid (propanoic acid), butyric acid (Butyric acid), pentanoic acid (Pentanoic acid or valeric acid), hexanoic acid (hexanoic acid or Caproic acid), heptanoic acid (Heptanoic acid or Enanthic acid), Octanoic acid (Octanoic acid or Caprylic acid), Nonanoic acid (Nonanoic acid or Pelargonic acid), Decanoic acid (Decanoic acid or Capric acid), Dodecanoic acid or lauric acid), tetradecanoic acid (Tetradecanoic acid or Myristic acid), hexadecanoic acid (hexadecanoic acid or palmitic acid), octadecanoic acid (octadecanoic acid or stearic acid) and these It may be at least one selected from the group consisting of a mixture of, but is not limited thereto.

The first and second amine-based compounds are the same as or different from each other, and methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine ( Hexylamine, octylamine, nonylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, octadecylamine, dimethyl 1 selected from the group consisting of amine (dimethylamine), diethylamine (diethanamine), dipropylamine, tributylamine, trioctylamine, oleylamine, and mixtures thereof It may be more than one species, but is not limited thereto.

The non-polar solvent is toluene, hexane, cyclohexane, decane, dodecane, tetradecane, hexadecane, octadecane, 1 It may be at least one member selected from the group consisting of -octadecene (1-octadecene) and mixtures thereof, but is not limited thereto.

The inert gas may be argon (Ar) or helium (He), but is not limited thereto.

The cobalt sulfide is preferably contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the crude Portland cement. When the content of the cobalt sulfide is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the cobalt sulfide is too large, the manufacturing cost increases and the price competitiveness may decrease.

In addition, the functional improvement binder is an additive generally used in the art, and may further include at least one selected from the group consisting of a curing accelerator, a setting retarder, a water reducing agent, a material separation preventing agent, and mixtures thereof.

More specifically, the curing accelerator functions to further activate the hydration reaction of the composition to express compressive strength at an early stage. In consideration of this function, the curing accelerator is preferably contained in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the crude Portland cement.

In addition, the curing accelerator is generally used in the art, for example, calcium formate, calcium chloride, calcium salt such as calcium nitrate, chloride such as magnesium chloride, magnesium sulfate, sulfate such as aluminum sulfate, potassium hydroxide, sodium hydroxide , carbonates such as sodium carbonate, formic acid or a salt thereof, lithium carbonate, and the like can be used.

The setting retarder functions to maintain the initial working time and improve workability. In consideration of this function, the setting retardant is preferably contained in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the crude steel portland cement.

In addition, the setting retardant is generally used in the art, for example, glucose, glucose, dextrin, sugars such as dextran, gluconic acid, tartaric acid, malic acid, citric acid, citric acid, such as boric acid Acids or salts thereof, aminocarboxylic acids or salts thereof, phosphonic acid or derivatives thereof, polyvinyl alcohol, polyalcohols such as glycerin, and the like can be used.

The water reducing agent functions to temporarily improve fluidity by dispersing the particles by repulsive force between the particles. The water reducing agent is preferably contained in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the crude Portland cement.

In addition, the water-reducing agent is generally used in the art, for example, naphthalene-based, melamine-based, polycarboxylic acid-based water-reducing agent and the like may be used. More preferably, it is good to use a polycarboxylic acid-based water reducing agent.

The material separation preventing agent functions to prevent material separation of the composition and improve workability. The material separation preventing agent is preferably contained in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the crude Portland cement.

In addition, the material separation preventing agent is generally used in the art, for example, methyl cellulose, starch, gum (Gum), etc. may be used. More preferably, it is good to use a starch-based material separation preventing agent with a small decrease in strength.

On the other hand, the function-improving admixture serves to improve the curing time, workability, strength and durability of the super-fast and super-steel cement concrete composition having excellent crack resistance performance of the present invention.

The function-improving admixture is preferably contained in an amount of 0.5 to 20% by weight in the ultra-fast and ultra-high-strength cement concrete composition having excellent crack resistance performance of the present invention. When the content of the function-improving admixture is too small, the improvement effect may be weak, and when the content of the function-improving admixture is too large, the viscosity is lowered and workability (slump) can be improved, but by delaying the hydration reaction There is a problem in that the quick-hardening property is lowered or the manufacturing cost is increased, so that the price competitiveness may be lowered.

The function-improving admixture is 100 parts by weight of acrylic latex, 70 to 90 parts by weight of acrylonitrile-butadiene-styrene copolymer, 70 to 90 parts by weight of methyl methacrylate-maleic anhydride copolymer, 10 to 30 parts by weight of polyamideimide resin , 10 to 30 parts by weight of the styrene-maleimide copolymer, 0.1 to 10 parts by weight of thiophosphate, and 0.1 to 10 parts by weight of luteolinidine glycoside may be used.

The acrylic latex serves to improve water resistance, alkali resistance, and weather resistance as well as improving bending, tensile and adhesion strength with excellent adhesion.

The acrylic latex is methyl methacrylate (MMA: Methyl Methacrylate) 30 to 50% by weight, acrylic acid normal butyl ester (BA: Butyl Acrylate Monomer) 5 to 20% by weight, acrylonitrile 0.1 to 10% by weight, dimethylammono The above effects can be achieved by using one prepared by polymerizing a monomer composition for polymerization containing 0.1 to 10% by weight of ethylmethyl acrylate and 30 to 50% by weight of 2-ethylhexyl acrylate (2-EHA: 2-Ethyl Hexylacrylate). can be further improved.

Hereinafter, the content of other components constituting the functional improvement admixture is based on 100 parts by weight of the acrylic latex.

The acrylonitrile-butadiene-styrene copolymer functions to enhance warpage, tensile and adhesive strength, and to improve excellent compatibility, freeze-thaw resistance, chemical resistance, waterproofness and durability.

The acrylonitrile-butadiene-styrene copolymer is preferably contained in an amount of 70 to 90 parts by weight based on 100 parts by weight of the acrylic latex. When the content of the acrylonitrile-butadiene-styrene copolymer is too small, there is a problem that the improvement effect may be reduced, and when the content of the acrylonitrile-butadiene-styrene copolymer is too large, initial strength is expressed This delay or the above improvement effect is not improved any more, there is a problem that price competitiveness may be lowered.

The methyl methacrylate-maleic anhydride copolymer functions to enhance warpage, tensile and adhesive strength. In addition, it prevents material separation, enhances tensile strength, suppresses cracking, reduces the width of cracks after cracks occur, improves durability, and improves weather resistance.

The methyl methacrylate-maleic anhydride copolymer is preferably contained in an amount of 70 to 90 parts by weight based on 100 parts by weight of the acrylic latex. If the content of the methyl methacrylate-maleic anhydride copolymer is too small, the improvement effect may be reduced. The effect is no longer improved, and there is a problem that price competitiveness may be lowered.

The polyamide-imide resin has a function of improving bending, tensile and adhesion strength, improving water resistance, crack resistance and durability, and shortening the curing time.

More specifically, the polyamide-imide resin is an imidized product of a polyamic acid obtained by copolymerizing an aromatic diamine monomer, an aromatic dianhydride monomer, and an aromatic carbonyl monomer in an inert atmosphere. At this time, the aromatic carbonyl monomer is 10 to 20 mol% of isophthaloyl chloride (isophthaloyl chloride), 75 to 85 mol% of terephthaloyl chloride and 0.01 to 5 mol% of trimesoyl chloride ( trimesoyl chloride). In addition, it contains 90 to 99.5 mol% of the aromatic diamine monomer based on the total moles of the aromatic dianhydride monomer and the aromatic carbonyl monomer.

Specifically, as the aromatic diamine monomer, 2,2'-bis(trifluoromethyl)-4,4'-biphenyldiamine (2,2'-bis(trifluoromethyl)-4,4'-biphenyldiamine ), 4,4'-diaminodiphenyl sulfone (4,4'-diaminodiphenyl sulfone), 4,4'-(9-fluorenylidene) dianiline (4,4'-(9-fluorenylidene) dianiline) , bis (4- (4-aminophenoxy) phenyl) sulfone (bis (4- (4-aminophenoxy) phenyl) sulfone), 2,2',5,5'-tetrachlorobenzidine (2,2',5 ,5'-tetrachlorobenzidine), 2,7-diaminofluorene (2,7-diaminofluorene), 4,4-diaminooctafluorobiphenyl (4,4-diaminooctafluorobiphenyl), m-phenylenediamine (m- phenylenediamine), p-phenylenediamine, 4,4'-oxydianiline, 2,2'-dimethyl-4,4'-diaminobiphenyl (2 ,2'-dimethyl-4,4'-diaminobiphenyl), 2,2-bis[4-(4-aminophenoxy)phenyl]propane (2,2-bis[4-(4-aminophenoxy)phenyl]propane) , 1,3-bis (4-aminophenoxy) benzene (1,3-bis (4-aminophenoxy) benzene), and the group consisting of 4,4'-diaminobenzanilide (4,4'-diaminobenzanilide) One or more compounds selected from may be preferably used.

As the aromatic dianhydride monomer, 3,3',4,4'-biphenyltetracarboxylic dianhydride (3,3',4,4'-biphenyltetracarboxylic dianhydride), 4,4'-(hexa Fluoroisopropylidene) diphthalic anhydride (4,4'-(hexafluoroisopropylidene)diphthalic anhydride), 2,2'-bis-(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (2, 2'-bis- (3,4-dicarboxyphenyl) hexafluoropropane dianhydride), benzophenone tetracarboxylic dianhydride, pyromellitic dianhydride, benzophenone tetracarboxylic dianhydride Ride (benzophenone tetracarboxylic dianhydride), oxydiphthalic anhydride, cyclobutane-1,2,3,4-tetracarboxylic dianhydride (cyclobutane-1,2,3,4-tetracarboxylic dianhydride) , cyclopentane tetracarboxylic dianhydride, and bis (3,4-dicarboxyphenyl) sulfone dianhydride (bis (3,4-dicarboxyphenyl) sulfone dianhydride) one selected from the group consisting of The above compounds can be preferably used.

It is preferable that an aromatic dicarbonyl monomer and a tricarbonyl monomer are applied together as the aromatic carbonyl monomer. The aromatic dicarbonyl monomer includes 4,4'-biphenyldicarbonyl chloride, isophthaloyl chloride and terephthaloyl chloride. One or more compounds selected from may be applied. As the aromatic tricarbonyl monomer, trimesoyl chloride may be applied.

The polyamic acid may be a block copolymer or a random copolymer. The polyamic acid block copolymer may include a first unit structure derived from copolymerization of the aromatic diamine monomer and the aromatic dianhydride monomer; and a second unit structure derived from copolymerization of the aromatic diamine monomer and the aromatic carbonyl monomer. In addition, the random polyamic acid copolymer may include a unit structure in which the aromatic diamine monomer, the aromatic dianhydride monomer, and the aromatic carbonyl monomer each form an amide bond and are randomly copolymerized.

This polyamic acid forms a polyamide-imide resin having an imide bond and an amide bond at the same time by imidization (thermal and chemical methods).

The polyamide-imide resin is preferably contained in an amount of 10 to 30 parts by weight based on 100 parts by weight of the acrylic latex. If the content of the polyamide-imide resin is too small, the improvement effect may be insufficient, and if the content of the polyamide-imide resin is too large, workability and price competitiveness may be reduced. .

The styrene-maleimide copolymer functions to enhance warpage, tensile and adhesive strength, and to improve excellent compatibility, freeze-thaw resistance, heat resistance, chemical resistance and durability.

The styrene-maleimide copolymer preferably has a glass transition temperature (Tg) of 150 to 200° C. and is an N-phenyl maleimide-styrene-maleic anhydride copolymer.

The styrene-maleimide copolymer is preferably contained in an amount of 10 to 30 parts by weight based on 100 parts by weight of the acrylic latex. When the content of the styrene-maleimide copolymer is too small, the improvement effect may be reduced, and when the content of the styrene-maleimide copolymer is too large, the improvement effect is not improved anymore. , there is a problem that price competitiveness may be lowered.

The thiophosphate ester provides excellent workability and excellent miscibility between materials, and functions to improve crack resistance and durability.

The thiophosphate ester is preferably triphenyl phosphorothioate or butylated triphenyl phosphorothioate, and triphenyl phosphorothioate and butylated triphenyl phosphorothioate in a weight ratio of 2 to 8: 2 to 8 It is more preferable to use the mixture in a weight ratio range.

The thiophosphate ester is preferably contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the acrylic latex. When the content of the thiophosphate ester is too small, there is a problem that the above-described improvement effect may be lowered, and when the content of the thiophosphate ester is too large, the improvement effect is not improved any more, and the price competitiveness is lowered. There are possible problems.

The luteolinidine glycoside provides excellent adhesion strength, workability, and excellent miscibility between materials, and functions to improve crack resistance, resistance to salt damage, neutralization, and the like and durability.

The luteolinidine glycoside is preferably contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the acrylic latex. When the content of the luteolinidine glycoside is too small, there is a problem that the above-mentioned improvement effect may be lowered, and when the content of the luteolinidine glycoside is too large, the above-mentioned improvement effect is not improved any more, the price There is a problem that may reduce competitiveness.

In addition, the function-improving admixture is an additive generally used in the art, and may further include one or more selected from the group consisting of an antifoaming agent, an air entraining agent, and mixtures thereof.

More specifically, the anti-foaming agent functions to further improve strength and durability by reducing the amount of air and removing entrapped air and voids in the concrete. In consideration of these functions, the antifoaming agent is preferably contained in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the acrylic latex.

In addition, the anti-foaming agent is generally used in the art, for example, a silicone-based anti-foaming agent, a fatty acid-based anti-foaming agent, an oil-based anti-foaming agent, an ester-based anti-foaming agent, an oxyalkylene-based anti-foaming agent, an alcohol-based anti-foaming agent and the like may be used. The silicone-based antifoaming agent includes dimethyl silicone oil, polyorganosiloxane, fluorosilicone oil, and the like, and the fatty acid-based antifoaming agent includes stearic acid and oleic acid. In addition, the oil-based anti-foaming agent includes kerosene, animal and vegetable oil, castor oil, and the like, and the ester-based anti-foaming agent includes solitol trioleate, glycerol monoricinolate, and the like. In addition, the oxyalkylene-based antifoaming agent includes polyoxyalkylene, acetylene ethers, polyoxyalkylene fatty acid ester, polyoxyalkylenealkylamine, and the like, and the alcohol-based antifoaming agent includes glycol.

The air entraining agent functions to improve the workability by improving the dispersibility of the composition. In consideration of these functions, the air entraining agent is preferably contained in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the acrylic latex.

In addition, the air entraining agent is generally used in the art, for example, there are polycarboxylic acid-based, naphthalene-based, melamine-based, and the like. More preferably, the air entraining agent is a polycarboxylic acid-based air entraining agent.

The super-velocity and super-strength cement concrete composition with excellent crack resistance according to a preferred embodiment of the present invention is prepared by stirring 20 to 50% by weight of fine aggregate, 10 to 40% by weight of coarse aggregate, and 10 to 40% by weight of functional improvement binder in a forced mixer. After mixing, 0.5 to 20% by weight of the functional improvement admixture and 0.1 to 5% by weight of water are further mixed and stirred for a predetermined time (eg, 1 to 10 minutes).

In addition, another embodiment of the present invention is a road pavement maintenance method using the ultra-high speed and ultra-steel cement concrete composition having excellent crack resistance performance,

removing the deteriorated, damaged or contaminated parts of the construction target surface; cleaning the removed area; Primer or blooming treatment on the cleaned area; pouring the super-velocity and super-strength cement concrete composition having excellent crack resistance performance on the primer or blooming-treated upper part; After pouring, tinting to increase crack induction and slip resistance; Spraying a curing agent to prevent initial plastic cracking by preventing evaporation of moisture in the upper part after the tinting step; And it provides a road pavement maintenance method comprising the step of curing.

More specifically, the step of removing the deteriorated, damaged, or contaminated portion of the construction target surface; cutting and blasting the deteriorated, damaged or contaminated portion of the construction target surface using a crusher, a planer, a shot blaster, or a water jet. can be performed.

In addition, the step of treating the cleaned area with a primer or blooming; refers to an operation of facilitating adhesion of the ultra-high-speed and ultra-steel cement concrete composition with excellent crack resistance according to an embodiment of the present invention to the construction target surface. can be used as

At this time, as the primer material, at least one selected from polyacrylic ester (PAE), epoxy emulsion, ethyl vinyl acetate (EVA) and acrylic emulsion may be selected and used.

In addition, as the blooming material, at least one selected from poly acrylic ester (PAE), epoxy emulsion, ethyl vinyl acetate (EVA) and acrylic emulsion may be selected and used.

In addition, in the curing step, depending on the atmospheric conditions including the temperature, humidity, and wind strength of the site, 1) spraying only the curing agent, or 2) after spraying the curing agent, cover the top with a vinyl or curing cloth and water it. It is recommended to separate the curing steps while maintaining the wet state, or 3) using a vinyl, curing cloth, or a thermal insulation cover after curing the curing agent is sprayed.

In particular, in the curing step, in the case of on-site atmospheric conditions (for example, in the case of high atmospheric temperature (25°C or higher), low relative humidity, and windy atmospheric conditions, such as in summer, vinyl, curing cloth, etc. Conversely, if the atmospheric temperature (below 25℃) is not high, relative humidity is high, and there is little wind, spray only curing agent and cure according to). After spraying, cover the vinyl, curing cloth, etc. on the upper part and water it, and it can be applied separately in the curing step while maintaining the wet state. In addition, when the atmospheric temperature is 5 ℃ or less, after spraying the curing agent, it may further include the step of performing thermal insulation curing using a vinyl, curing cloth, a thermal insulation cover, and the like.

According to the super-velocity and super-strength cement concrete composition having excellent crack resistance performance according to an embodiment of the present invention and the road pavement maintenance method using the same, the effect of accelerating the initial hydration of cement and densification of the internal structure is remarkably increased, In particular, since it is possible to secure initial strength after application, the work time can be dramatically shortened, which has the effect of greatly shortening the construction period and minimizing the traffic control time.

In addition, physical properties such as adhesion performance, flexural strength and compressive strength are further strengthened, and long-term storage stability is excellent. It has the effect of being able to maintain the repair and reinforcement effect for a long time as the resistance is improved remarkably.

As mentioned above, although preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various modifications can be made by those skilled in the art within the scope of the technical spirit of the present invention. This is possible.

<Production Example 1>

Preparation of potassium magnesium titanate

A titanium oxide source (artificial rutile having a TiO ₂ content of 99 wt%), a potassium oxide source (a potassium carbonate content of 99.5 wt%) and a magnesium oxide source (a magnesium oxide content of 99.5 wt%) ) was mixed in a weight ratio of 74: 18: 8 and mixed for 20 minutes in a double cone mixer. Thereafter, the temperature was raised to 1,500 ℃ in a high-frequency induction furnace to melt, and the molten metal was discharged to a storage container through the side outlet and cooled naturally to synthesize potassium magnesium titanate (K ₂ OMgO ₆ TiO ₂ ). Thereafter, primary crushing is performed in a jaw crusher to have an average particle diameter of about 30 mm, and secondary crushing is performed in a pin mill to an average particle diameter of about 1 mm, followed by an average particle diameter of about 22 in an air classifier crusher (ACM). Potassium magnesium titanate was prepared by tertiary grinding and classification so as to become μm.

<Production Example 2>

Preparation of lepidochrosite

A 0.3 M NaBH ₄ aqueous solution was mixed with 0.05 M Fe(NO ₃ ) ₃ 9H ₂ O aqueous solution at 400 rpm while stirring for 50 seconds. In this case, NaBH4 may have a purity of >95% as a product of TCI, and Fe(NO ₃ ) ₃ ·9H ₂ O may have a purity of >98% as a product of Aldrich. After the mixing, reacted at 24° C. for 40 minutes, filtered using filter paper, and dried at 80° C. for 8 hours to prepare lepidochrosite.

<Production Example 3>

Preparation of needle-shaped Spongilla lacustris spicules with pores formed on the surface

The crushed Spongilla lacustris was supported for 15 minutes with 0.1M hydrochloric acid solution, then 5 ml/g of 30% (w/w) hydrogen peroxide was added and heated for 2 hours, and then heated for 2 hours at 300 W and 40 kHz conditions for 1 hour. After sonicating for a while, filtration and washing with 500 ml of purified water were repeated three times to extract Spongilla lacustris spicules.

After that, the extracted Spongilla lacustris spicules were supported in 0.5M hydrochloric acid solution for 1 day, washed with phosphate buffered saline to neutralize acidity and washed 3 times with purified water, and then dried at 50 ° C. I got my brother's Spongilla Lacustris Spicule.

Then, 20 ml/g of 35% (w/w) hydrogen peroxide was added to the needle-shaped Spongilla lacustris spicule, stirred and reacted for 15 hours, and pores ( pores) were formed. Thereafter, the process of filtration and washing with 500 ml of purified water was repeated three times, and then dried at 50° C. to obtain a needle-shaped Spongilla lacustris spicule with pores formed on the surface.

<Production Example 4>

Preparation of needle-shaped Spongilla lacustris spicules modified with hydrophilic surface

The crushed Spongilla lacustris was supported for 15 minutes with 0.1M hydrochloric acid solution, then 5 ml/g of 30% (w/w) hydrogen peroxide was added and heated for 2 hours, and then heated for 2 hours at 300 W and 40 kHz conditions for 1 hour. After sonicating for a while, filtration and washing with 500 ml of purified water were repeated three times to extract Spongilla lacustris spicules.

After that, the extracted Spongilla lacustris spicules were supported in 0.5M hydrochloric acid solution for 1 day, washed with phosphate buffered saline to neutralize acidity and washed 3 times with purified water, and then dried at 50 ° C. I got my brother's Spongilla Lacustris Spicule.

Then, 20 ml/g of 35% (w/w) hydrogen peroxide was added to the needle-shaped Spongilla lacustris spicule, stirred and reacted for 15 hours, and pores ( pores) were formed. Thereafter, the process of filtration and washing with 500 ml of purified water was repeated three times, and then dried at 50° C. to obtain a needle-shaped Spongilla lacustris spicule with pores formed on the surface.

10 ml/g of 1N NaOH was added to the needle-shaped Spongilla lacustris spicules having pores formed on the surface and reacted at 40° C. for 1 hour. Thereafter, the process of filtration and washing with 500 ml of purified water was repeated three times, and then dried at 50° C. to obtain a needle-shaped Spongilla lacustris spicule whose surface was modified to be hydrophilic (hydroxyl group).

<Preparation Example 5>

Preparation of needle-shaped Spongilla lacustris spicules modified with hydrophilic surface

The crushed Spongilla lacustris was supported for 15 minutes with 0.1M hydrochloric acid solution, then 5 ml/g of 30% (w/w) hydrogen peroxide was added and heated for 2 hours, and then heated for 2 hours at 300 W and 40 kHz conditions for 1 hour. After sonicating for a while, filtration and washing with 500 ml of purified water were repeated three times to extract Spongilla lacustris spicules.

After that, the extracted Spongilla lacustris spicules were supported in 0.5M hydrochloric acid solution for 1 day, washed with phosphate buffered saline to neutralize acidity and washed 3 times with purified water, and then dried at 50 ° C. I got my brother's Spongilla Lacustris Spicule.

Then, 20 ml/g of 35% (w/w) hydrogen peroxide was added to the needle-shaped Spongilla lacustris spicule, stirred and reacted for 15 hours, and pores ( pores) were formed. Thereafter, the process of filtration and washing with 500 ml of purified water was repeated three times, and then dried at 50° C. to obtain a needle-shaped Spongilla lacustris spicule with pores formed on the surface.

5 N concentration of calcium hydroxide (Ca(OH) ₂ ) and 5 N concentration of magnesium hydroxide (Mg(OH) ₂ ) were added to the needle-shaped Spongilla lacustris spicule having pores on the surface 1: 10 ml/g of a basic compound mixed in a 0.5 volume ratio was added and reacted at 40° C. for 1 hour. Thereafter, the process of filtration and washing with 500 ml of purified water was repeated three times, and then dried at 50° C. to obtain a needle-shaped Spongilla lacustris spicule whose surface was modified to be hydrophilic (hydroxyl group).

<Preparation Example 6>

Preparation of cobalt sulfide

Cobalt chloride hexahydrate (0.4 mmol, Aldrich, 98%), oleic acid (35 mmol, Aldrich, 90%), oleylamine (35 mmol, TCI, 50%) and 1-octadecine (140 mmol, Aldrich, 90%) %) was prepared. The mixed solution was placed in a three-necked flask and heat-treated at 110° C. for 1 hour in an argon gas atmosphere to prepare a mixture. A solution of sulfur (2 mmol, Aldrich, sulfur powder) dispersed in 5 mmol oleylamine (35 mmol, TCI, 50%) was mixed with the mixture and stirred to react at a reaction temperature of 270°C. The material produced through the above reaction step was centrifuged (7000 rpm) and purified with a solution of ethanol and toluene in a 50:1 volume ratio to prepare cobalt sulfide.

<Production Example 7>

polyamide imide resin

While slowly blowing nitrogen into a 1000 mL 4-neck round flask (reactor) equipped with a stirrer, nitrogen injector, dropping funnel, and temperature controller, fill 42.5 g of N,N-dimethylacetamide and , After adjusting the temperature of the reactor to 25 ℃ 2,2'-bis (trifluoromethyl) -4,4'-biphenyldiamine (2,2'-bis (trifluoromethyl) -4,4'-biphenyldiamine , TFDB) was completely dissolved by adding 4.4886 g (0.01401 mol). While maintaining the temperature of this solution at 25 °C, 0.0200 g (0.0001 mol) of cyclobutane-1,2,3,4-tetracarboxylic dianhydride (CBDA) After the addition, the mixture was stirred for a certain period of time to dissolve and react.

And, after cooling the temperature of the solution to -10 ℃, isophthaloyl chloride (isophthaloyl chloride, IPC) 0.5336 g (0.002628 mol), terephthaloyl chloride (terephthaloyl chloride, TPC) 2.4307 g (0.01197 mol) and Trimesoyl chloride (TMC) 0.0027 g (0.000010 mol) was added and stirred to obtain a polyamic acid solution having a solid content of 15 wt%.

N,N-dimethylacetamide was added to the polyamic acid solution to dilute the concentration of the solid content to 5 wt% or less, and then the solid content was precipitated with 10 L of methanol. After filtration of the precipitated solid content, it was dried under vacuum at 100° C. for 6 hours or more to obtain a polyamide-imide resin in the form of a solid content (weight average molecular weight of about 172,111 g/mol).

<Examples and Comparative Examples>

Fine aggregate, coarse aggregate, and function-improving binder mixed in the components and contents shown in Table 1 below were put in a forced mixing mixer, mixed for 3 minutes under dry mixing conditions, and components and contents as shown in Table 1 below The mixed functional improvement admixture and water were added at the same time and mixed for 2 minutes to prepare an ultra-fast and ultra-hard cement concrete composition with excellent crack resistance and a comparative concrete composition.

Category (wt%) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 fine aggregate 38 38 38 38 38 coarse aggregate 31 31 31 31 31 water 3 3 3 3 3 Functional improvement binder 19 19 19 19 19 (parts by weight) crude steel portland cement 100 100 100 100 100 Calcium sulfoaluminate 26 26 26 26 26 Potassium Magnesium Titanate
[Production Example 1] 10 10 10 10 10 Silicon Manganese Slag ⁽¹⁾ (Powder: 3,870 ㎠/g) 7 7 7 - 7 Lepidochrosite [Preparation Example 2] 3 3 3 - - Astaxanthin ⁽²⁾ 2 2 2 - - spicule 3
[Production Example 3] 3
[Production Example 4] 3
[Production Example 5] - - Cobalt sulfate [Preparation Example 6] 2 2 2 - - hardening accelerator 1.4 1.4 1.4 1.4 1.4 setting retardant 0.2 0.2 0.2 0.2 0.2 water reducing agent 0.9 0.9 0.9 0.9 0.9 material segregation inhibitor 0.5 0.5 0.5 0.5 0.5 Functional improvement admixture 9 9 9 9 9 (parts by weight) Acrylic Latex ⁽²⁾ 100 100 100 100 100 Acrylonitrile-butadiene-styrene copolymer 82 82 82 82 82 Methyl methacrylate-maleic anhydride copolymer 78 78 78 78 78 polyamide imide resin
[Production Example 7] 16 16 16 - 16 Styrene-Maleimide Copolymer ⁽⁴⁾ 13 13 13 - - Thiophosphate ⁽⁵⁾ 5 5 5 - - luteolinidine glycoside 3 3 3 - - antifoam 0.8 0.8 0.8 0.8 0.8 air entrainment agent 1.2 1.2 1.2 1.2 1.2 ⁽¹⁾ silicon manganese slag: silicon oxide (SiO ₂ ) 35.9 wt%, aluminum oxide (Al ₂ O ₃ ) 23.1 wt%, calcium oxide (CaO) 12.8 wt%, magnesium oxide (MgO) 6.7 wt% and manganese oxide ( MnO) 14.5 wt% was used.
⁽²⁾ Astaxanthin: (3,3'dihydroxy-β-carotene-4,4'dione) was purchased from Sigma Chemicals (St. Louis, Mo., USA).
⁽³⁾ acrylic latex: methyl methacrylate (MMA: Methyl Methacrylate) 45 wt%, acrylic acid normal butyl ester (BA: Butyl Acrylate Monomer) 8 wt%, acrylonitrile 4.5 wt%, dimethylammonoethylmethyl acrylate 3.5 Weight% and 2-ethylhexyl acrylate (2-EHA: 2-Ethyl Hexylacrylate) using the one prepared by polymerizing a monomer composition for polymerization containing 39% by weight.
⁽⁴⁾ Styrene-maleimide copolymer: N-phenyl maleimide-styrene-maleic anhydride copolymer (Denka, MS-NJ) having a glass transition temperature (Tg) of about 185°C is used
⁽⁵⁾ Thiophosphoric acid ester: triphenyl phosphorothioate 4 weight ratio and butylated triphenyl phosphorothioate 6 weight ratio mixed use

The following test examples are experiments comparing the characteristics of Examples 1 and 2 according to the present invention with those of Comparative Examples 1 and 2 in order to more easily grasp the characteristics of Examples 1 to 3 according to the present invention disclosed above. the results are shown.

<Test Example 1>

According to the method specified in KS F 2402, the slump test (kneading) of the cement concrete compositions for super-velocity and ultra-high-strength cement concrete compositions with excellent crack resistance performance according to Examples 1 to 3 of the present invention and the cement concrete compositions for comparison according to Comparative Examples 1 and 2 according to KS F 2402. degree) was performed. The slump test is to test the toughness of the dough, such as the softness and consistency of concrete, and the larger the number, the better the workability, that is, the workability when the concrete is poured. The change value of the slump over time is shown in Table 2 below.

Slump (cm) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Immediately after stirring 24 24 24 24 24 after 20 minutes 22 22 23 17 20 after 30 minutes 19 19 21 12 18 after 40 minutes 17 18 10 9 15

As can be seen in Table 2 above, the cement concrete compositions for super-velocity and super-hardening steel having excellent crack resistance performance according to Examples 1 to 3 were compared to the comparative cement concrete compositions according to Comparative Examples 1 and 2, and the workability was improved. It was confirmed that it was very good.

<Test Example 2>

In order to more specifically grasp the characteristics of the ultra-high-speed and ultra-hard cement concrete composition having excellent crack resistance according to the present invention, the ultra-high speed and ultra-hard cement concrete compositions having excellent crack resistance performance according to Examples 1 to 3 of the present invention; The properties of the comparative concrete compositions according to Comparative Examples 1 and 2 were evaluated, and the results are shown in Table 3 below.

Test Items Test Methods Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Drying shrinkage (length change rate (%)) KS F 2424 0.004 0.003 0.001 0.31 0.21 Compressive strength (MPa)_12 hours KS F 2405 23 22 25 12 17 Compressive strength (MPa)_28 days KS F 2405 33 34 37 16 25 Flexural strength (MPa)_12 hours KS F 2405 5.3 5.7 6.5 2.1 3.0 Flexural strength (MPa)_28 days KS F 2405 8.8 8.9 9.4 3.7 4.9 Adhesive strength (MPa)_12 hours KS F 2762 2.4 2.3 2.8 1.2 1.7 Adhesive strength (MPa)_28 days KS F 2762 3.6 3.5 4.0 1.8 2.2 Salt penetration resistance (coulomb) KS F 2711 735 741 679 1405 1098 Freeze-thaw resistance (%) KS F 2456 88 90 92 70 81 Wear resistance (mm) ASTM C 779 0.07 0.05 0.02 0.47 0.21 crack resistance AASHTO PP34-98 no cracks no cracks no cracks crack generation no cracks weight change rate
(%) Hydrochloric acid Japanese industrial standard draft
[Method of testing chemical resistance by solution immersion of concrete] -0.5 -0.3 -0.1 -1.7 -0.9 sulfuric acid -0.03 -0.02 -0.01 -0.8 -0.3 sodium hydroxide 0.2 0.1 0.1 1.5 0.8 Anti-rust rate (%) KS F 2561 92 94 97 71 83 Absorption rate (%) KS F 4004 0.3 0.3 0.1 3.2 1.6

As can be seen in Table 3, the super-velocity and super-strength cement concrete compositions having excellent crack resistance performance according to Examples 1 to 3 were more resistant to drying shrinkage than the comparative cement concrete compositions according to Comparative Examples 1 and 2. It was confirmed that the rate of change in length was small. In addition, the cement concrete compositions of super-velocity and super-hardening properties excellent in crack resistance according to Examples 1 to 3 have superior compressive strength, flexural strength and adhesion strength, compared to the comparative cement concrete composition according to Comparative Example 1; It was confirmed that it had excellent salt penetration resistance, freeze-thaw resistance, abrasion resistance, chemical resistance, rust prevention rate and low water absorption.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that all of the embodiments described above are illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention, rather than the above detailed description, all changes or modifications derived from the meaning and scope of the claims to be described later and their equivalents.

Claims (5)

20 to 50% by weight of fine aggregate, 10 to 40% by weight of coarse aggregate, 10 to 40% by weight of a functional improving binder, 0.5 to 20% by weight of a functional improving admixture, and 0.1 to 5% by weight of water;
The function-improving binder includes 100 parts by weight of crude steel portland cement, 20 to 40 parts by weight of calcium sulfoaluminate, 1 to 20 parts by weight of potassium magnesium titanate, 1 to 20 parts by weight of silicon manganese slag, 0.1 to 10 parts by weight of lepidochrosite, 0.1 to 10 parts by weight of astaxanthin, 0.1 to 10 parts by weight of spicule, and 0.1 to 10 parts by weight of cobalt sulfate;
The function-improving admixture is 100 parts by weight of acrylic latex, 70 to 90 parts by weight of acrylonitrile-butadiene-styrene copolymer, 70 to 90 parts by weight of methyl methacrylate-maleic anhydride copolymer, 10 to 30 parts by weight of polyamideimide resin , styrene-maleimide copolymer 10 to 30 parts by weight, thiophosphate 0.1 to 10 parts by weight, and luteolinidine glycoside 0.1 to 10 parts by weight of luteolinidine glycoside, characterized in that it contains excellent cracking resistance performance of super-fast and super-strength cement concrete composition.
According to claim 1,
The polyamide-imide resin is obtained by copolymerizing an aromatic diamine monomer, an aromatic dianhydride monomer and an aromatic carbonyl monomer in an inert atmosphere,
The aromatic carbonyl monomer is 10 to 20 mol% of isophthaloyl chloride, 75 to 85 mol% of terephthaloyl chloride and 0.01 to 5 mol% of trimesoyl chloride ) containing
A cement concrete composition with excellent crack resistance, characterized in that it contains 90 to 99.5 mol% of the aromatic diamine monomer based on the total moles of the aromatic dianhydride monomer and the aromatic carbonyl monomer.
According to claim 1,
The styrene-maleimide copolymer has a glass transition temperature (Tg) of 150 to 200° C., and is an N-phenyl maleimide-styrene-maleic anhydride copolymer. composition.
According to claim 1,
The spicule is a needle-shaped Spongilla lacustris spicule whose surface is modified to be hydrophilic;
The needle-shaped Spongilla lacustris spicule, whose surface is modified to be hydrophilic, is
Supporting the crushed Spongilla lacustris with hydrochloric acid solution, and then heating and sonicating by adding hydrogen peroxide to extract Spongilla lacustris spicules;
After supporting the extracted Spongilla lacustris spicules in hydrochloric acid solution, washing with phosphate buffered saline to neutralize the acidity and drying to obtain a needle-shaped Spongilla lacustris spicules;
forming pores on the surface of the needle-shaped Spongilla lacustris spicule by reacting the needle-shaped Spongilla lacustris spicule and hydrogen peroxide for 6 to 20 hours; and
Super velocity with excellent crack resistance performance, characterized in that it is prepared by a manufacturing method comprising the step of modifying the surface to be hydrophilic by reacting a basic compound with a needle-shaped Spongilla lacustris spicule having pores formed on the surface Hard and ultra-hard cement concrete compositions.
As a road pavement maintenance method using the super-velocity and ultra-steel cement concrete composition having excellent crack resistance according to any one of claims 1 to 4,
removing the deteriorated, damaged or contaminated parts of the construction target surface; cleaning the removed area; Primer or blooming treatment on the cleaned area; pouring the super-velocity and super-strength cement concrete composition having excellent crack resistance performance on the primer or blooming-treated upper part; After pouring, the step of tying in order to increase the crack induction and slip resistance; Spraying a curing agent to prevent initial plastic cracking by preventing evaporation of moisture in the upper part after the tinting step; And road pavement maintenance method comprising the step of curing .