KR102353572B1 - Polymer modified quick-hardening cement concrete composition for repairing road pavement and construction method for repairing road pavement using the same - Google Patents

Abstract

The present invention relates to a polymer modified quick-hardening cement concrete composition for repairing road pavement and a construction method for repairing road pavement using the same. The polymer modified quick-hardening cement concrete composition for repairing road pavement comprises: 20-50 wt% of fine aggregate; 10-40 wt% of coarse aggregate 10-40 wt% of a high performance binder; 0.5-20 wt% of a polymer modifier; and 0.1-5 wt% of water. The high performance binder comprises: 100 parts by weight of crude Portland cement; 20-40 parts by weight of calcium sulfoaluminate; 1-20 parts by weight of strontium chloroapatite; 1-20 parts by weight of furnace slag powder; 0.1-10 parts by weight of ferronickel slag; 0.1-10 parts by weight of hematite; 0.1-10 parts by weight of cookeite; and 0.1-10 parts by weight of copper sulfide. The polymer modifier comprises: 100 parts by weight of acrylic latex; 70-90 parts by weight of a silicone-fluorine-epoxy (meth) acrylate resin; 10-30 parts by weight of a polyetherester resin; 10-30 parts by weight of polyvinyl acetate; 0.1-10 parts by weight of acacetin; and 0.1-10 parts by weight of epigallocatechin gallate. Accordingly, since a curing period is shortened so that a damaged part of a concrete road can be quickly repaired; surface cracking and expansion destruction caused by drying and shrinkage can be prevented; and all characteristics and durability required for pavement can be greatly improved. Therefore, the service period can be extended and maintenance costs can be reduced.

Description

Polymer modified quick-hardening cement concrete composition for repairing road pavement and construction method for repairing road pavement using the same}

According to the present invention, the curing period is shortened, so the damaged part of the concrete road can be quickly restored, the surface cracking and expansion destruction caused by drying shrinkage can be prevented, and the overall characteristics and durability required for pavement can be greatly improved. There is, it relates to a polymer-modified super-fast cement concrete composition for road pavement repair, which can extend the service period and reduce the cost of maintenance, and a method for repairing and constructing a road pavement using the same.

In general, concrete pavements have disadvantages such as rigidity, which has large construction restrictions on temperature and surrounding environment, takes a long curing period, cracks due to drying shrinkage, unpleasant ride comfort and noise, etc., but excellent durability and maintenance It is being applied to highways and heavy-vehicle roads with advantages such as cost reduction.

However, in these concrete pavements, the bearing capacity of the pavement layer 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 pavement layer is cracked or cracked due to vehicle load, etc. This happens frequently. In addition, when cracks occur in the concrete pavement layer, rainwater penetrates through the cracks and the damaged part of the road expands rapidly and the cracks progress due to the load of vehicles running on the road, so prompt repair is required.

In such a concrete pavement, it is advantageous to remove the damaged part and repair it with a road pavement repair method such as repaving, but it is advantageous in terms of the durability of the repair part, but also for the repaved road, the original paved part and the repaired part are treated under the same conditions. It is not possible to do this, so there is a problem such as a level difference between the existing road and the repaired repavement part, giving an impact to a moving vehicle. Therefore, there was a problem in that the passage of vehicles must be restricted for a certain period of time.

In order to solve this problem, crude steel Portland cement (type 3 cement) is widely used in repair work to repair or reinforce areas where corrosion or erosion occurs a lot, such as bridge slabs, road surfaces of road pavements, and external walls of concrete structures. However, compared to general cement, crude Portland cement can exhibit practical strength within a short period of time (3 hours) and has excellent workability. There was a problem that directly caused the decrease in durability. In addition, there was a problem in that the permeability was high, and the penetration of chloride or moisture occurred and the concrete was corroded.

Therefore, in recent emergency repair works, the use of polymer-modified super-velocity cement concrete in which SB latex or the like is added as a polymer modifier to concrete is gradually increasing in order to compensate for the shortcomings of crude steel portland cement. However, the strength and durability of the polymer-modified super-fast cement concrete still fall short of expectations. More specifically, it is pointed out as a problem that microcracks occur because a high heat of hydration is generated as a rapid hydration reaction proceeds after pouring. The microcracks generated in this way act as penetration channels for moisture, chlorine ions, carbon dioxide, and the like, so there was still a problem of lowering durability. In particular, there was a problem in that the decrease in durability becomes more noticeable when the snow removal agent is used in the most frequent use of the bridge pavement in winter.

Republic of Korea Patent Registration No. 10-0618297 Republic of Korea Patent Registration No. 10-1498502 Republic of Korea Patent Registration No. 10-1970676

The present invention has been devised to solve the above-mentioned problems, and an embodiment of the present invention promotes the initial hydration of cement and densification of the tissue to shorten the curing period, provide tight concrete, and provide all required for pavement. Polymer modified super-fast cement concrete composition for road pavement repair that can improve durability such as excellent strength and abrasion resistance, impact resistance, corrosion resistance, watertightness, adhesion, crack resistance, salt penetration resistance, freeze thaw resistance and abrasion resistance and to provide a method for repairing and constructing a road pavement 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 high performance binder, 0.5 to 20% by weight of polymer modifier and 0.1 to 5% by weight of water;

The high-performance 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 strontium chloroapatite, 1 to 20 parts by weight of fine blast furnace slag powder, 0.1 to 10 parts by weight of ferronickel slag, and hematite. 0.1 to 10 parts by weight, 0.1 to 10 parts by weight of cuqite and 0.1 to 10 parts by weight of copper sulfide;

The polymer modifier is 100 parts by weight of acrylic latex, 70 to 90 parts by weight of silicone-fluorine-epoxy (meth)acrylate resin, 10 to 30 parts by weight of polyether ester resin, 10 to 30 parts by weight of polyvinyl acetate, 0.1 to It provides a polymer-modified ultra-fast cement concrete composition for road pavement repair comprising 10 parts by weight and 0.1 to 10 parts by weight of epigallocatechin gallate.

the hematite is porous alkaline hematite;

The porous alkaline hematite is obtained by leaching 100 parts by weight of bauxite and 0.1 to 10 parts by weight of slaked lime into a sodium hydroxide (NaOH) solution having a concentration of 3 to 20% by weight at 200 to 280°C and 35 to 40 kgf/cm2. , obtaining red mud as an unreacted solid obtained as a by-product; and washing the red mud, drying it at a high temperature at a temperature of 280 to 300°C, and pulverizing it to have an average particle diameter of 5 to 70 μm.

The washing of the red mud is a surface treatment and cleaning composition comprising 100 parts by weight of a sodium hydroxide (NaOH) solution having a concentration of 3 to 20% by weight, 10 to 20 parts by weight of an aniline solution, and 3 to 8 parts by weight of a hydroxyiminodisuccinic acid chelating agent After surface treatment and washing with a furnace, it may be carried out by filtration and washing with purified water.

The copper sulfide is plate-shaped copper sulfide;

The plate-shaped copper sulfide is a mixture of copper (I) thiocyanic acid and an organic solvent such that the concentration of copper (I) thiocyanic acid in the mixture is 50 to 150 mM, and the mixture is stirred at 80 to 150 ° C. under vacuum. to do; and heat-treating the stirred mixture at 250 to 500° C. under a gas atmosphere;

It may be a plate-shaped copper sulfide having an average particle diameter of 20 to 500 nm and an average thickness of 2 to 30 nm.

Another embodiment of the present invention is a method of repairing a road pavement using the polymer-modified super-fast cement concrete composition for road pavement repair,

removing the deteriorated, damaged or contaminated parts of the concrete structure; cleaning the removed area; Primer or blooming treatment on the cleaned area; pouring the polymer-modified super-fast cement concrete composition for road pavement repair on the primer or blooming-treated upper part; After pouring, the step of tinting 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 it provides a repair construction method of the road pavement comprising the step of curing.

According to the polymer-modified ultra-fast cement concrete composition for road pavement repair and the road pavement repair construction method using the same according to an embodiment of the present invention, the curing period is shortened and the vehicle control time and It has the effect of dramatically reducing the construction cost. In addition, it provides tight concrete by accelerating the initial hydration of cement and densification of the tissue, and effectively prevents cracks by reducing heat generation due to initial hydration, thereby preventing surface cracking and expansion fracture caused by drying shrinkage. can do. In addition, all properties required for packaging, that is, excellent strength and abrasion resistance, impact resistance, corrosion resistance, watertightness, adhesion, crack resistance, salt penetration resistance, freeze-thaw resistance and abrasion resistance, etc. can be greatly improved. The period extension and maintenance cost can be reduced, and excellent workability can be provided.

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 high performance binder, 0.5 to 20% by weight of polymer modifier and 0.1 to 5% by weight of water;

The high-performance 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 strontium chloroapatite, 1 to 20 parts by weight of fine blast furnace slag powder, 0.1 to 10 parts by weight of ferronickel slag, and hematite. 0.1 to 10 parts by weight, 0.1 to 10 parts by weight of cuqite and 0.1 to 10 parts by weight of copper sulfide;

The polymer modifier is 100 parts by weight of acrylic latex, 70 to 90 parts by weight of silicone-fluorine-epoxy (meth)acrylate resin, 10 to 30 parts by weight of polyether ester resin, 10 to 30 parts by weight of polyvinyl acetate, 0.1 to It provides a polymer-modified ultra-fast cement concrete composition for road pavement repair comprising 10 parts by weight and 0.1 to 10 parts by weight of epigallocatechin gallate.

According to the polymer-modified ultra-fast cement concrete composition for road pavement repair and the road pavement repair construction method using the same according to an embodiment of the present invention, the curing period is shortened and the vehicle control time by quickly repairing the damaged part of the concrete road And there is an effect that can dramatically reduce the construction cost. In addition, it provides tight concrete by accelerating the initial hydration of cement and densification of the tissue, and effectively prevents cracks by reducing heat generation due to initial hydration, thereby preventing surface cracking and expansion fracture caused by drying shrinkage. can do. In addition, all properties required for packaging, that is, excellent strength and abrasion resistance, impact resistance, corrosion resistance, watertightness, adhesion, crack resistance, salt penetration resistance, freeze-thaw resistance and abrasion resistance, etc. can be greatly improved. The period extension and maintenance cost can be reduced, and excellent workability can be provided.

The polymer-modified super-fast cement concrete composition for road pavement repair 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 high-performance binder, and 0.5 to 20% by weight of polymer modifier. 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 polymer-modified ultra-fast cement concrete composition for road pavement repair of the present invention, and the coarse aggregate is 10 to 50 wt% with respect to the polymer-modified ultra-fast cement concrete composition for road pavement repair of the present invention It is preferable to contain 40% by weight.

First, the high-performance binder includes 100 parts by weight of crude portland cement, 20 to 40 parts by weight of calcium sulfoaluminate, 1 to 20 parts by weight of strontium chloroapatite, 1 to 20 parts by weight of fine blast furnace slag, 0.1 to 10 parts by weight of ferronickel slag, 0.1 to 10 parts by weight of hematite, 0.1 to 10 parts by weight of kukite, and 0.1 to 10 parts by weight of copper sulfide may be used.

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

Hereinafter, the content of other components constituting the high-performance binder is based on 100 parts by weight of the crude Portland cement.

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. If the content of the calcium sulfoaluminate is too small, there is a problem that the above-described improvement effect may be insufficient. There is a problem in that price competitiveness may be lowered.

The strontium chloroapatite provides an excellent strength-reinforcing effect, improves long-term strength, improves abrasion resistance, and provides excellent heat and corrosion resistance, thereby greatly improving freeze-thaw resistance, salt damage resistance and chemical resistance.

The strontium chloroapatite is preferably contained in an amount of 1 to 20 parts by weight based on 100 parts by weight of the crude Portland cement. When the content of strontium chloroapatite is too large, there is a problem in that workability may be deteriorated or price competitiveness may be reduced.

The fine blast furnace slag powder is a by-product generated in the ironmaking industry, which improves stable long-term strength expression and water tightness, provides microcrack prevention and shrinkage prevention effects by lowering the heat of hydration, and provides excellent resistance to salt damage and freeze-thaw by improving chemical durability function to

More specifically, the blast furnace slag may preferably have a fineness of 4,500 to 9,000 cm 2 /g.

The fine powder of blast furnace 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 fine blast furnace slag powder is too small, the improvement effect may be insufficient, and when the content of the fine blast furnace slag powder is too large, the initial strength expression may be delayed.

The ferronickel slag refers to slag generated during a smelting reduction process in an electric furnace during the production of ferronickel in a ferronickel factory, and functions to improve strength expression and watertightness, and to provide an effect of preventing shrinkage.

More specifically, the ferronickel slag has a SiO ₂ content of 50 to 70 wt%, a MgO content of 25 to 45 wt%, a CaO content of 0.1 to 3 wt%, and a Fe ₂ O ₃ content of 1 to 10% by weight, _{the content of Al 2} O ₃ is 0.1 to 3% by weight, the content of NiO is 0.1 to 3% by weight, and _{the content of Cr 2} O ₃ is 0.1 to 3% by weight. In addition to being able to further improve the crack control effect, there is an effect that can further improve the excellent crack control effect.

The ferronickel slag is preferably contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the crude steel portland cement. If the content of the ferronickel slag is too small, there is a problem that the above improvement effect may be insufficient. There is a problem that can be degraded.

The hematite exhibits excellent strength, and functions to provide excellent anticorrosive properties, rust prevention properties, and shrinkage prevention effects.

More specifically, by using porous alkaline hematite as the hematite, the above-described effect can be further improved.

The porous alkaline hematite may be prepared by washing red mud, which is an unreacted solid obtained as a by-product, in the Bayer process for producing alumina by extracting aluminum hydroxide from bauxite, followed by drying and pulverizing at a high temperature. .

More preferably, the porous alkaline hematite contains 100 parts by weight of bauxite and 0.1 to 10 parts by weight of slaked lime at 200 to 280° C. and 35 to 40 kgf/cm 2 Sodium hydroxide (NaOH) at a concentration of 3 to 20% by weight leaching into the solution to obtain red mud as an unreacted solid obtained as a by-product; And after washing the red mud, dried at a high temperature at a temperature of 280 to 300 ° C., and pulverized to have an average particle diameter of 5 to 70 μm By being prepared by a manufacturing method comprising 40 to 50 _{Fe 2} O _{3 components} It may be included in a weight % range, and an alkali component (Na ₂ O or CaO) in a range of 5 to 15 weight %.

In this case, the washing of the red mud includes 100 parts by weight of a sodium hydroxide (NaOH) solution having a concentration of 3 to 20% by weight, 10 to 20 parts by weight of an aniline solution, and 3 to 8 parts by weight of a hydroxyiminodisuccinic acid chelating agent. It may be carried out by surface treatment and washing with a cleaning composition, followed by filtration and washing with purified water. Accordingly, not only can the above-described effect be further improved, but it also improves the watertightness of concrete by forming a stable and dense structure in the long term, suppressing cracks, and contributing to stable strength enhancement, thereby further improving water resistance and waterproofing properties there is

The hematite is preferably contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the crude steel portland cement. When the content of hematite is too small, the improvement effect may be insufficient, and when the content of hematite is too large, there is a problem that the initial strength expression may be delayed.

The cuqite is a layered inorganic compound, and by forming a long-term stable and dense structure, improves the watertightness of concrete, suppresses cracks, and contributes to stable strength enhancement, thereby improving water resistance and waterproofing properties.

The cuqite 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 cuqite is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of cuqite is too large, there is a problem that the initial strength expression may be delayed.

The copper sulfide has a function of very effectively preventing shrinkage and microcracks of concrete by making the structure dense, and providing excellent corrosion resistance, greatly improving salt damage resistance and chemical resistance. In addition, it functions to provide fast curing properties.

More specifically, the above-described effect may be further improved by using a plate-shaped copper sulfide as the copper sulfide.

The plate-shaped copper sulfide is obtained by mixing a mixture of copper (I) thiocyanic acid and an organic solvent such that the concentration of copper (I) thiocyanic acid in the mixture is 50 to 150 mM, under vacuum at 80 to 150 ° C. stirring; and heat-treating the stirred mixture at 250 to 500° C. under a gas atmosphere; Plate-shaped copper sulfide having an average particle diameter of 20 to 500 nm and an average thickness of 2 to 30 nm may be preferably used.

At this time, the organic solvent is dodecane, octadecine, oleylamine, octadecylamine, trioctylamine, oleic acid, stearic acid, palmitic acid, elaidic acid, vaccenic acid, linolenic acid, arachidonic acid, erucic acid, be At least one selected from the group consisting of henic acid and a mixed solvent thereof may be preferably used.

In addition, the gas may preferably be air, argon (Ar), helium (He), or nitrogen (N ₂ ) gas.

The copper 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 copper sulfide is too small, there is a problem that the improvement effect may be insufficient, and when the content of the copper sulfide is too large, there is a problem that price competitiveness may be lowered.

In addition, the high-performance 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 delay agent functions to maintain the initial working time and improve workability. In consideration of these functions, 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 Portland cement.

In addition, the setting delay agent 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, a naphthalene-based, melamine-based, polycarboxylic acid-based water-reducing agent 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 polymer modifier functions to improve the curing time, workability, strength and durability of the polymer-modified super-fast cement concrete composition for road pavement repair of the present invention.

The polymer modifier is preferably contained in an amount of 0.5 to 20 wt% in the polymer-modified super-fast cement concrete composition for road pavement repair of the present invention. If the content of the polymer modifier is too small, the above-described improvement effect may be weak. If the content of the polymer modifier is too large, the viscosity may be lowered and workability (slump) may be improved. There is a problem in that price competitiveness may be lowered due to this decrease or increase in manufacturing cost.

The polymer modifier is 100 parts by weight of acrylic latex, 70 to 90 parts by weight of silicone-fluorine-epoxy (meth)acrylate resin, 10 to 30 parts by weight of polyether ester resin, 10 to 30 parts by weight of polyvinyl acetate, 0.1 to 10 parts by weight and 0.1 to 10 parts by weight of epigallocatechin gallate 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 30 to 50% by weight of methyl methacrylate (MMA), 5 to 20% by weight of acrylic acid normal butyl ester (BA: Butyl Acrylate Monomer), 0.1 to 10% by weight of acrylonitrile, dimethylammono The above effects can be achieved by using a monomer composition for polymerization containing 0.1 to 10 wt% of ethylmethyl acrylate and 30 to 50 wt% of 2-ethylhexyl acrylate (2-EHA: 2-Ethyl Hexylacrylate). can be further improved.

Hereinafter, the content of other components constituting the polymer modifier is based on 100 parts by weight of the acrylic latex.

The silicone-fluorine-epoxy (meth)acrylate resin has excellent adhesion, and not only improves bending, tensile and adhesion strength, but also resistance to salt damage, neutralization, frost damage, water permeability, chemical resistance, water resistance, alkali resistance, weather resistance , It functions to improve durability such as waterproofness and rust prevention.

The silicone-fluorine-epoxy (meth)acrylate resin 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 silicone-fluorine-epoxy (meth)acrylate resin is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the silicone-fluorine-epoxy (meth)acrylate resin is too large There is a problem that can lower price competitiveness.

The polyether ester resin functions to enhance bending, tensile and adhesive strength. In particular, it suppresses cracking by greatly enhancing tensile strength, and after cracking, reduces the width of cracks and improves durability.

The polyether ester resin 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 polyether ester resin is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the polyether ester resin is too large, there is a problem that the initial strength expression may be delayed.

The polyvinyl acetate functions to improve bending, tensile and adhesive strength. In addition, it prevents material separation, improves tensile strength, suppresses cracking, and improves durability such as watertightness, waterproofness and rust prevention.

More specifically, the polyvinyl acetate is prepared by mixing 1 to 30% by weight of polyvinyl acetate in a mixed solvent in which dimethyl sulfoxide (DMSO) and methyl ethyl ketone are mixed in a volume ratio of 1: 0.5 to 1 to prepare a spinning solution. , By electrospinning the spinning solution at a voltage of 5 to 40 kV, the above-mentioned effect can be further improved by using the one having an average diameter of 100 to 800 nm.

The polyvinyl acetate 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 polyvinyl acetate is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the polyvinyl acetate is too large, the initial strength expression is delayed or the price competitiveness may be lowered. have.

The acacetin serves to provide excellent workability and excellent miscibility between materials, and to improve resistance to salt damage and neutralization.

The acacetin 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 acacetin is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of acacetin is too large, there is a problem that durability may be reduced or price competitiveness may be lowered.

The epigallocatechin gallate serves to provide excellent workability and excellent miscibility between materials, and to improve durability such as resistance to salt damage, neutralization, and freeze damage, water permeability resistance, chemical resistance, waterproofness and rust prevention.

The epigallocatechin gallate 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 epigallocatechin gallate is too small, the improvement effect may be insufficient. When the content of the epigallocatechin gallate is too large, the initial strength expression is delayed or the price competitiveness is low. There is a problem that can be degraded.

In addition, the polymer modifier not only further enhances bending, tensile and adhesion strength by providing excellent bonding strength, but also improves particularly excellent crack resistance and shrinkage resistance, resistance to salt damage, neutralization, frost damage, etc., water permeability resistance, waterproofness, etc. In order to improve durability, a ceramide-based derivative represented by the following Chemical Formula 1 may be further included.

[Formula 1]

In the above formula,

R ₁ and R ₂ are each independently at least one selected from the group consisting of linear or branched (C7 to C30)alkyl, (C7 to C30)alkenyl, and mixed functional groups thereof.

More specifically, the ceramide-based derivative is obtained by using a mixture of a ceramide-based derivative represented by the following Chemical Formula 1-1 and a ceramide-based derivative represented by the following Chemical Formula 1-2 in a ratio of 1: 2 to 5, by weight. Not only can it be further improved, but there is an effect that can provide durability such as particularly excellent water permeability resistance and waterproofness.

[Formula 1-1]

[Formula 1-2]

The ceramide-based derivative represented by Formula 1 is preferably contained in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the acrylic latex. When the content of the ceramide-based derivative represented by Formula 1 is too small, there is a problem that the above-described improvement effect may be insufficient, and when the content of the ceramide-based derivative represented by Formula 1 is too large, the performance improvement effect is further There is a problem in that price competitiveness may be lowered due to the high production cost and the production cost.

In addition, the polymer modifier 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 this function, 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 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 polymer-modified super-velocity cement concrete composition for road pavement repair according to a preferred embodiment of the present invention comprises 20 to 50 wt% of fine aggregate, 10 to 40 wt% of coarse aggregate, and 10 to 40 wt% of high-performance binder after stirring in a forced mixer, It can be prepared by further mixing 0.5 to 20% by weight of a polymer modifier and 0.1 to 5% by weight of water and stirring for a predetermined time (eg, 1 to 10 minutes).

In addition, another embodiment of the present invention is a method of repairing a road pavement using the polymer-modified super-velocity cement concrete composition for road pavement repair,

removing the deteriorated, damaged or contaminated parts of the concrete structure; cleaning the removed area; Primer or blooming treatment on the cleaned area; pouring the polymer-modified super-fast cement concrete composition for road pavement repair on the primer or blooming-treated upper part; After pouring, the step of tinting 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 it provides a repair construction method of the road pavement comprising the step of curing.

More specifically, the step of removing the deteriorated, damaged or contaminated portion of the concrete structure; is to be performed by cutting and blasting the deteriorated, damaged or contaminated portion of the concrete structure using a crusher, a planer, a shot blaster, or a water jet. can

In addition, the step of treating the cleaned area with a primer or blooming; is to be used to mean an operation of facilitating attachment of the polymer-modified ultra-fast cement concrete composition for road pavement repair according to an embodiment of the present invention to a concrete slab. can

In this case, as the primer 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, 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 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 atmospheric conditions with high atmospheric temperature (25 ℃ or more), low relative humidity, and windy 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 top with vinyl, curing cloth, etc. 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 vinyl, curing cloth, insulation cover, etc.

According to the polymer-modified ultra-fast cement concrete composition for road pavement repair and the road pavement repair construction method using the same according to an embodiment of the present invention, the curing period is shortened and the vehicle control time and It has the effect of dramatically reducing the construction cost. In addition, it provides tight concrete by accelerating the initial hydration of cement and densification of the tissue, and effectively prevents cracking by reducing heat generation due to initial hydration, thereby preventing surface cracking and expansion fracture caused by drying shrinkage. can do. In addition, all properties required for packaging, that is, excellent strength and abrasion resistance, impact resistance, corrosion resistance, water tightness, adhesion, crack resistance, salt penetration resistance, freeze-thaw resistance and abrasion resistance, etc. can greatly improve the durability. The period extension and maintenance cost can be reduced, and excellent workability can be provided.

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 porous alkaline hematite

100 parts by weight of bauxite was leached into a sodium hydroxide (NaOH) solution having a concentration of 15% by weight under conditions of 250° C. and 40 kgf/cm 2 to obtain red mud as an unreacted solid obtained as a by-product. The red mud was filtered and washed with purified water. Thereafter, by drying at a temperature of 300° C. for 1.5 minutes and pulverizing to an average particle size of 15 μm, porous alkaline hematite containing 48.98 wt% of _{Fe 2} O ₃ component and 6.03 wt% of _{Na 2 O component} was prepared.

<Preparation Example 2>

Preparation of porous alkaline hematite

100 parts by weight of bauxite and 0.8 parts by weight of slaked lime were leached into a 15% by weight sodium hydroxide (NaOH) solution at 250° C. and 40 kgf/cm 2 to obtain red mud, an unreacted solid obtained as a by-product. After surface treatment and washing of the red mud with a surface treatment and cleaning composition comprising 100 parts by weight of a sodium hydroxide (NaOH) solution having a concentration of 15% by weight, 15 parts by weight of an aniline solution and 5 parts by weight of a hydroxyiminodisuccinic acid chelating agent, Filtration and washing with purified water.

Thereafter, by drying at a temperature of 300° C. for 2 minutes and pulverizing to an average particle size of 19 μm, 47.10 wt% of _{Fe 2} O _{3 component, 5.38 wt% of Na 2} O component, and 4.27 wt% of CaO component Porous alkaline hematite containing % by weight was prepared.

<Production Example 3>

Production of plate-shaped copper sulfide

After putting it in a reaction vessel together with oleylamine so that the concentration of the copper (I) thiocyanic acid (CuSCN) compound, which is a precursor in the form of a fine powder, becomes 55 mM, the mixture was stirred under vacuum at 130 ° C for 10 minutes and then argon ( Ar) Fill with gas.

Insert the reaction vessel into the oil bath preheated to 300 ℃, heat treatment for about 30 minutes, cool to room temperature, wash with toluene and methanol, and centrifuge to obtain an average particle diameter of about 135 nm and an average thickness of 17 nm A dark brown plate-shaped copper sulfide was prepared.

<Examples and Comparative Examples>

Fine aggregate, coarse aggregate, and high-performance binder mixed with 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 the components and contents as shown in Table 1 below were used. A polymer-modified super-fast cement concrete composition for road pavement repair and a comparative concrete composition were prepared by mixing the mixed polymer modifier and water at the same time and mixing for 2 minutes.

Category (wt%) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 fine aggregate 38 38 38 38 38 coarse aggregate 35 35 35 35 35 water 3 3 3 3 3 high performance binder 15 15 15 15 15 (parts by weight) crude steel portland cement
(Powder: 4,720 ㎠/g) 100 100 100 100 100 Calcium sulfoaluminate 32 32 32 - 32 strontium chloroapatite 17 17 17 - - Blast Furnace Slag Fine Powder
(Powder: 4,830 ㎠/g) 9 9 9 - 9 Ferronickel Slag ⁽¹⁾ 6 6 6 - 6 hematite 7
[Production Example 1] 7
[Production Example 1] 7
[Production Example 2] - - Kukite 3 3 3 - - copper sulfide 3
[normal
copper sulfide powder] 3
[Production Example 3]
3
[Production Example 3] - - 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 separation inhibitor 0.5 0.5 0.5 0.5 0.5 polymer modifier 9 9 9 9 9 (parts by weight) Acrylic Latex ⁽²⁾ 100 100 100 100 100 Silicone-fluorine-epoxy (meth)acrylate resin 72 72 72 - 72 polyether ester resin 17 17 17 - - polyvinyl acetate ⁽³⁾ 15 15 15 - - acacetin 3 3 3 - - epigallocatechin gallate 3 3 3 - - Ceramide derivatives - One
[Formula 1-1] 1 ⁽⁴⁾ - - antifoam 0.8 0.8 0.8 0.8 0.8 air entrainment agent 1.2 1.2 1.2 1.2 1.2

[화학식 1-2]

⁽¹⁾ ferronickel slag: _{the content of SiO 2} is 54.8% by weight, the content of MgO is 34.2% by weight, the content of CaO is 0.9% by weight, the content of Fe ₂ O ₃ is 5.4% by weight, and Al ₂ O _{The content of 3} is 1.2 wt%, the content of NiO is 0.28 wt%, and _{the content of Cr 2} O ₃ is 0.54 wt%.

⁽²⁾ 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.

⁽³⁾ Polyvinyl acetate: After preparing a spinning solution by mixing 27 wt% of polyvinyl acetate with 73 wt% of a mixed solvent mixed with dimethyl sulfoxide (DMSO) and methyl ethyl ketone in a 1:0.5 volume ratio, the above By electrospinning the spinning solution with a voltage of 20 kV, an average diameter of 296 nm is used.

^{(4) A} mixture of a ceramide-based derivative represented by the following Chemical Formula 1-1 and a ceramide-based derivative represented by the following Chemical Formula 1-2 is used in a 1:3 weight ratio
[Formula 1-1]

[Formula 1-2]

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

<Test Example 1>

The polymer-modified super-velocity cement concrete composition for road pavement repair according to Examples 1 to 3 of the present invention and the cement concrete composition for comparison according to Comparative Examples 1 and 2 were subjected to a slump test (degree of kneading) according to the method specified in KS F 2402. ) was performed. The slump test is to test the quality 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 pouring concrete. 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 23 23 23 23 23 after 20 minutes 21 21 22 17 19 after 30 minutes 20 19 20 12 15 after 40 minutes 16 17 18 4 7

As can be seen in Table 2, the polymer-modified super-velocity cement concrete composition for road pavement repair according to Examples 1 to 3 has very excellent workability compared to the comparative cement concrete compositions according to Comparative Examples 1 and 2 could confirm that

<Test Example 2>

Polymer-modified super-velocity cement concrete composition for road pavement repair according to Examples 1 to 3 of the present invention and Comparative Examples 1 and The characteristics of the comparative concrete composition according to 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 0.005 0.003 0.002 0.13 0.09 Compressive strength (MPa)_12 hours KS F 2405 29 33 34 14 19 Compressive strength (MPa)_28 days KS F 2405 41 42 45 21 27 Flexural strength (MPa)_12 hours KS F 2405 6.3 6.7 6.9 2.6 3.5 Flexural strength (MPa)_28 days KS F 2405 9.9 10.2 10.5 5.1 6.2 Adhesive strength (MPa)_12 hours KS F 2762 2.7 2.8 2.8 0.8 1.7 Adhesive strength (MPa)_28 days KS F 2762 3.8 4.0 4.2 1.5 2.4 Salt penetration resistance (coulomb) KS F 2711 562 514 435 1871 1540 Freeze-thaw resistance (%) KS F 2456 89 92 93 59 71 Wear resistance (mm) ASTM C 779 0.08 0.07 0.03 0.48 0.23 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] -0.1 0 -0.1 -2.3 -1.8 sulfuric acid -0.1 0 -0.1 -0.6 -0.2 sodium hydroxide 0.1 0.05 0.05 1.3 0.4 Rust rate (%) KS F 2561 94.5 95.4 96.8 75.7 77.1 Absorption rate (%) KS F 4004 0.1 0.2 0.1 1.6 1.3

As can be seen in Table 3, the polymer-modified super-velocity cement concrete composition for road pavement repair according to Examples 1 to 3 was compared to the comparative cement concrete composition according to Comparative Examples 1 and 2, and the length according to drying shrinkage It was confirmed that the rate of change was small. In addition, the polymer-modified super-velocity cement concrete composition for road pavement repair according to Examples 1 to 3 has superior compressive strength, flexural strength and adhesion strength, as 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 high performance binder, 0.5 to 20% by weight of polymer modifier and 0.1 to 5% by weight of water;
The high-performance binder is 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 strontium chloroapatite, 1 to 20 parts by weight of fine blast furnace slag powder, 0.1 to 10 parts by weight of ferronickel slag, hematite 0.1 to 10 parts by weight, 0.1 to 10 parts by weight of cuqite and 0.1 to 10 parts by weight of copper sulfide;
The polymer modifier is 100 parts by weight of acrylic latex, 70 to 90 parts by weight of silicone-fluorine-epoxy (meth)acrylate resin, 10 to 30 parts by weight of polyether ester resin, 10 to 30 parts by weight of polyvinyl acetate, 0.1 to Polymer-modified ultra-fast cement concrete composition for road pavement repair, characterized in that it contains 10 parts by weight and 0.1 to 10 parts by weight of epigallocatechin gallate.
According to claim 1,
the hematite is porous alkaline hematite;
The porous alkaline hematite is
100 parts by weight of bauxite and 0.1 to 10 parts by weight of slaked lime are leached into a sodium hydroxide (NaOH) solution having a concentration of 3 to 20% by weight under conditions of 200 to 280°C and 35 to 40 kgf/cm 2 , and unreacted obtained as a by-product obtaining red mud as a solid; and
After washing the red mud, it is dried at a high temperature at a temperature of 280 to 300 ℃, and is manufactured by a manufacturing method comprising the step of pulverizing to have an average particle diameter of 5 to 70 μm. Light cement concrete composition.
3. The method of claim 2,
The washing of the red mud is
A surface treatment and washing composition comprising 100 parts by weight of a sodium hydroxide (NaOH) solution having a concentration of 3 to 20% by weight, 10 to 20 parts by weight of an aniline solution, and 3 to 8 parts by weight of a hydroxyiminodisuccinic acid chelating agent. Then, the polymer-modified super-fast cement concrete composition for road pavement repair, characterized in that it is carried out by filtration and washing with purified water.
According to claim 1,
The copper sulfide is plate-shaped copper sulfide;
The plate-shaped copper sulfide is a mixture of copper (I) thiocyanic acid and an organic solvent such that the concentration of copper (I) thiocyanic acid in the mixture is 50 to 150 mM, and the mixture is stirred at 80 to 150 ° C. under vacuum. to do; and heat-treating the stirred mixture at 250 to 500° C. under a gas atmosphere;
A polymer-modified super-velocity cement concrete composition for road pavement repair, characterized in that it is plate-shaped copper sulfide having an average particle diameter of 20 to 500 nm and an average thickness of 2 to 30 nm.
A method for repairing and constructing a road pavement using the polymer-modified super-velocity cement concrete composition for road pavement repair according to any one of claims 1 to 4,
removing the deteriorated, damaged or contaminated parts of the concrete structure; cleaning the removed area; Primer or blooming treatment on the cleaned area; pouring the polymer-modified super-fast cement concrete composition for road pavement repair on the primer or blooming-treated upper part; After pouring, the step of tinting 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 repair construction method of the road pavement comprising the step of curing.