KR102127941B1 - High early strength cement concrete composition with rubber latex impregnated Ca-alginate bead and a repairing method of road pavement using the same - Google Patents

Abstract

The present invention relates to a high early strength cement concrete composition and a road pavement repairing method using the same. The high early strength cement concrete composition comprises 5 to 30 wt% of a high early strength cement-based binder, 20 to 60 wt% fine aggregate, 20 to 60 wt% of coarse aggregate, 0.1 to 10 wt% of water, and 0.5 to 15 wt% of a latex polymer modifier. The high early strength cement-based binder is usually at least one selected from the group consisting of 20 to 50 wt% of Portland cement, high early strength cement, calcium sulfoaluminate cement, and mixed cement thereof, and includes 10 to 40 wt% of high early strength cement with a fineness of 4,500 to 8,000 cm^2/g, 7 to 20 wt% of blast furnace slag fine powder with a fineness of 6,000 to 12,000 cm^2/g, 5 to 15 wt% of gypsum, 5 to 15 wt% of fly ash generated from a thermal power plant, 1 to 10 wt% of fly ash generated from a circulating fluidized bed boiler using petro-cokes, and 1 to 10 wt% of desulfurized gypsum generated from a circulating fluidized bed boiler using petro-cokes. The latex polymer modifier contains 40 to 80 wt% of acrylonitrile-butadiene-styrene, 15 to 45 wt% of rubber latex impregnated calcium-alginate beads, 1 to 10 wt% of a curing accelerator, and 0.5 to 5 wt% of a setting retardant. The high early strength cement concrete composition has excellent high early strength and crack-resistance.

Description

High early strength cement concrete composition with rubber latex impregnated Ca-alginate bead and a repairing method of road pavement using the same}

The present invention relates to a rough steel cement concrete composition having excellent roughness and crack resistance, and a road pavement repairing method using the same, including calcium-alginate beads loaded with rubber latex.

In general, pavement can be divided into two types: asphalt pavement and concrete pavement. Asphalt pavement has the advantage of providing a comfortable road environment for users and the advantage of easy maintenance, whereas it has the disadvantage that the life of the road is short as a soft pavement. On the other hand, concrete pavement classified as rigid pavement has the disadvantage of corrosion of rebar, deterioration of concrete, and difficulty in maintenance due to the penetration of chloride or moisture when the pavement surface falls off and cracks.

Plain concrete pavement is poured through a bi-beam process according to the formulation design (cement, coarse aggregate, sand, water), expressing the strength of the material and exhibiting adhesion, etc., but preparing for ordinary concrete formulation to overcome the harsh road environment Therefore, the improved strength, water resistance, and durability are not exhibited.

As one of the methods for effectively preventing the penetration of salt water or moisture, which directly affects the durability of ordinary concrete, latex modified concrete (LMC) bridge packaging method with synthetic rubber latex resin (SBR) added to ordinary concrete It is developed and utilized.

Examples of such technologies include Korean Registered Patent No. 10-0313599 "Modified Concrete for Impervious Bridge Surface Pavement", Korean Registered Patent No. 10-0421255 "Concrete or mortar containing synthetic rubber latex, and waterproof packaging method using them" Can.

The above technique has the advantage of improving the physical properties of concrete by mixing the latex solids of the fine particles in the concrete and evenly filling the micropores inside the concrete. That is, by filling the latex polymer film between the cement hydrate and the pores of the concrete, it is possible to obtain an effect of improving adhesion, bending-tensile strength, freezing resistance, chemical resistance, water resistance, and waterproofness.

However, due to the nature of latex that is sensitive to temperature and climatic conditions, the initial plastic shrinkage cracking problem occurs due to the fluctuation of the film formation time on the surface when the mixture of latex and concrete is not suitable for construction in domestic situations where the climatic conditions are fluctuating. There is a problem that occurs.

Republic of Korea Registered Patent No. 10-0313599 Republic of Korea Registered Patent No. 10-0421255

The present invention has been devised to solve the above-mentioned problems, and one embodiment of the present invention has excellent roughness, significantly shortening the construction period, improved crack resistance and watertightness, as well as improved basic steel properties. It is intended to provide a composition.

In addition, another embodiment of the present invention is to provide a road pavement repairing method using the crude steel cement concrete composition.

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

In one embodiment of the present invention, in the crude steel cement concrete composition, 5 to 30% by weight of the coarse-type cement-based binder, 20 to 60% by weight of fine aggregate, 20 to 60% by weight of coarse aggregate, 0.1 to 10% by weight of water, and 0.5 to 0.5% of latex polymer modifier 15% by weight,

The crude cement type binder is usually 20 to 50% by weight of Portland cement, at least one selected from the group consisting of crude steel cement, calcium sulfoaluminate cement, and mixed cements thereof, and crude steel cement having a powder strength of 4,500 to 8,000 ㎠/g 10 to 40% by weight, 7 to 20% by weight of blast furnace slag powder having a powder strength of 6,000 to 12,000 cm 2 /g, 5 to 15% by weight of gypsum, 5 to 15% by weight of fly ash generated in a thermal power plant, circulating fluidized bed using Petrocoke 1 to 10% by weight of fly ash generated in the boiler and 1 to 10% by weight of desulfurized gypsum generated in a circulating fluidized bed boiler using Petro Coke;

The latex polymer modifier is 40 to 80% by weight of acrylonitrile-butadiene-styrene, 15 to 45% by weight of calcium-alginate beads carrying rubber latex, 1 to 10% by weight of curing accelerator, and 0.5 to 5% by weight of coagulation retarder It provides a crude steel cement concrete composition comprising.

Forming a mixed solution by stirring the rubber latex dispersion aqueous solution and the calcium chloride aqueous solution at a predetermined ratio; Adding sodium (Na) alginate aqueous solution dropwise to the mixed solution to synthesize calcium-alginate beads carrying rubber latex; And washing and drying the synthesized rubber latex-supported calcium-alginate beads;

The rubber latex is butadiene or isoprene 65 to 95 parts by weight and styrene, acrylonitrile, divinylbenzene, alkyl acrylate-based ethyl acrylate and butyl acrylate selected from the group consisting of 5 to 35 weights of one or more vinyl monomers Anything containing wealth can be used.

The calcium-alginate beads on which the rubber latex is supported are coated with a fluorine-based rubber,

The fluorine-based rubber may be a copolymer of VDF (vinylidenefluoride) and HFP (hexafluoropropylene).

The fluorine-based rubber may further include 10 to 20 parts by weight of at least one inorganic powder selected from the group consisting of alumina, silica, and mixtures thereof, based on 100 parts by weight of the fluorine-based rubber.

Another embodiment of the present invention is a road pavement repairing method using a crude steel cement concrete composition according to one embodiment of the present invention, by cutting and chipping the road surface using a crusher, a water jet to remove deteriorated areas and impurities step; Cleaning the removed area; Maintaining a wet state by sprinkling the cleaned area; After maintaining the wet state, a step of blooming or primer treatment to obtain a high adhesion and waterproof effect; Pouring the crude steel cement concrete composition of the present invention on the top of the blooming or primer treatment; Spraying a curing agent to prevent initial plastic cracking by preventing evaporation of water at the top after pouring; A step of tinting to increase crack resistance and slip resistance after spraying the curing agent; And it provides a road pavement repairing method using a crude steel cement concrete composition comprising a curing step.

The crude steel cement concrete composition according to an embodiment of the present invention includes a latex polymer modifier containing a calcium-alginate bead carrying a crude steel type cement-based binder and rubber latex, and thus has an excellent roughness and watertightness, greatly reducing the construction period. There is. In addition, the adhesion strength is improved, in particular, the resistance to cracking is very excellent, and there is an effect of reducing shrinkage and expansion due to changes in external temperature. In addition, basic properties such as strength, freezing resistance, chemical resistance, water resistance, and water resistance are also improved.

FIG. 1 shows a schematic image of calcium-alginate beads 1 carrying rubber latex 10.
FIG. 2 shows a schematic image of the calcium-alginate beads 1 carrying the rubber latex 10 coated with the fluorine-based rubber 20.
FIG. 3 shows a schematic image of the calcium-alginate beads 1 carrying the rubber latex 10 coated with the surface of the fluorine-based rubber 20 containing the inorganic powder 30.

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

In one embodiment of the present invention, in the crude steel cement concrete composition, 5 to 30% by weight of the coarse-type cement-based binder, 20 to 60% by weight of fine aggregate, 20 to 60% by weight of coarse aggregate, 0.1 to 10% by weight of water, and 0.5 to 0.5% of latex polymer modifier Contains 15% by weight, the crude steel type cement-based binder is usually 20 to 50% by weight of Portland cement, at least one selected from the group consisting of crude steel cement, calcium sulfoaluminate cement, and mixed cements thereof, and has a powder strength of 4,500 to 10 to 40% by weight of 8,000 cm2/g crude steel cement, 7 to 20% by weight of fine powder of blast furnace slag with 6,000 to 12,000 cm2/g powder, 5 to 15% by weight gypsum, 5 to 15% by weight of fly ash generated in thermal power plants , 1 to 10% by weight of fly ash generated in a circulating fluidized bed boiler using petroleum coke and 1 to 10% by weight of desulfurized gypsum generated in a circulating fluidized bed boiler using petroleum coke; The latex polymer modifier is 40 to 80% by weight of acrylonitrile-butadiene-styrene, 15 to 45% by weight of calcium-alginate beads carrying rubber latex, 1 to 10% by weight of curing accelerator, and 0.5 to 5% by weight of coagulation retarder It provides a crude steel cement concrete composition comprising.

More specifically, the crude steel cement concrete composition according to one embodiment of the present invention comprises 5 to 30% by weight of a crude steel cement-based binder, 20 to 60% by weight of fine aggregate, 20 to 60% by weight of coarse aggregate, 0.1 to 10% by weight of water, and a latex polymer modifier 0.5 to 15% by weight.

The aggregate used in the present invention is divided into fine aggregate and coarse aggregate, and those having a particle diameter of 5 mm or less are referred to as fine aggregate, and those having a particle size greater than 5 mm are classified into coarse aggregate. The fine aggregate preferably contains 20 to 60% by weight in the crude steel cement concrete composition of the present invention, and the coarse aggregate preferably contains 20 to 60% by weight in the crude steel cement concrete composition of the present invention.

The crude cement type binder is usually 20 to 50% by weight of Portland cement, at least one selected from the group consisting of crude steel cement, calcium sulfoaluminate cement, and mixed cements thereof, and crude steel cement having a powder strength of 4,500 to 8,000 ㎠/g 10 to 40% by weight, 7 to 20% by weight of blast furnace slag powder having a powder strength of 6,000 to 12,000 cm 2 /g, 5 to 15% by weight of gypsum, 5 to 15% by weight of fly ash generated in a thermal power plant, circulating fluidized bed using Petrocoke By using 1 to 10% by weight of fly ash generated in the boiler and 1 to 10% by weight of desulfurized gypsum generated in a circulating fluidized bed boiler using petroleum coke, there is an effect of significantly shortening the construction period due to excellent roughness and watertightness. . In addition, the rubber latex is mixed with a latex polymer modifier containing calcium-alginate beads, which improves the adhesion strength, and in particular, has excellent resistance to cracking, thereby reducing shrinkage and expansion due to external temperature changes. There is. In addition, basic properties such as strength, freezing resistance, chemical resistance, water resistance, and water resistance are also improved.

The ordinary Portland cement is preferably used as specified in KS, and is preferably contained in an amount of 20 to 50% by weight with respect to the crude steel cement-based binder. The ordinary Portland cement can be preferably used having a powder strength of 3,000 to 5,000 cm 2 /g. When the powderiness of the ordinary Portland cement is too low, the reactivity decreases and the initial strength is delayed, and when the powderiness is too high, the reactivity increases and the workability deteriorates and cracks are concerned.

The crude steel-type cement is mixed with other components of the crude steel-type cement-based binder, and is used to contribute to the improvement of initial strength by generating a large amount of ettringite. The crude steel-type cement uses a powder of 4,500 to 8,000 cm 2 /g, so that an appropriate reaction can be performed at an early stage, and thus an initial strength can be expressed. As for the crude steel type cement, one or more types selected from the group consisting of crude steel cement, calcium sulfoaluminate cement and mixed cements thereof can be preferably used. At this time, it is preferable to use the crude steel cement specified in KS. The crude steel cement is preferably contained 10 to 40% by weight relative to the crude steel cement-based binder. If the content of the crude steel-type cement is too small, the above-mentioned improvement effect may be weak, and if the content of the crude steel-type cement is too large, there is a problem that it is difficult to secure a pot life or the price competitiveness may decrease due to a rapid reaction.

The blast furnace slag is a by-product generated in the steelmaking industry, and is mixed with other components of the crude steel type cement-based binder to improve long-term strength, lower hydration heat, and improve chemical durability. In particular, while effectively inducing an initial reaction, there is an effect capable of effectively expressing resistance to chlorine ion penetration even in a small amount. In addition, by reducing the amount of cement, it is effective in reducing the amount of carbon dioxide gas generated during cement production and saving resources such as limestone. Particularly, the blast furnace slag may further improve the above-described effect by using a powder having a particle size of 6,000 to 12,000 cm 2 /g, and in particular, it is mixed with other components of the crude steel-type cement-based binder to enhance initial compressive strength. It has the effect. The blast furnace slag is preferably contained in an amount of 7 to 20% by weight relative to the crude steel-type cement-based binder. If the content of the blast furnace slag is too small, the initial compressive strength may be lowered or the above-mentioned improvement effect may be weak, and if the content of the blast furnace slag is too large, unreacted blast furnace slag is potentially present to develop the initial compressive strength. There is a problem that can be lowered.

The gypsum is mixed with other components of the crude steel cement-based binder, and is used to prevent initial strength development and shrinkage. In addition, it is effective to prevent the crack of the concrete by compacting the structure and to prevent the shrinkage of the concrete. It is preferable that the gypsum is contained in an amount of 5 to 15% by weight with respect to the crude cement type binder. If the content of the gypsum is too small, the initial strength of concrete and the effect of inhibiting cracking may be weak, and if the content of the gypsum is too large, good physical properties may be obtained due to rapid curing properties, but overexpansion or water resistance may be deteriorated. There is a problem that can be.

The fly ash generated in the thermal power plant is an inorganic oxide remaining after incineration or combustion in the thermal power plant, as shown in Table 1 below, mainly SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ It is composed of inorganic oxides, and is also amorphous or contains small amounts of crystalline metal oxides such as quartz, iron oxide, and mullite. Fly ash generated in such a thermal power plant is usually used to increase the fluidity by partially substituting Portland cement and increasing the long-term strength due to pozzolanic reactivity. In particular, the pozzolanic reaction is initially activated by the stimulating effect of Ca(OH) ₂ generated by the CaO component reacting with water by mixing with other components of the crude cement type binder material, thereby increasing the initial strength. . The fly ash generated in the thermal power plant may further improve the above-described effect by using an average particle diameter of 30 to 80 μm and a molar ratio of SiO ₂ /Al ₂ O _{3 in} the range of 1.5 to 2.5.

It is preferable that the fly ash generated in the thermal power plant is contained in an amount of 5 to 15% by weight relative to the crude steel cement-based binder. If the content of the fly ash generated in the thermal power plant is too small, the above-mentioned improvement effect may be weak, and when the content of the fly ash generated in the thermal power plant is too large, there is a large amount of unreacted fly ash, and the strength is greatly reduced. There are potential problems.

Fly ash generated in the circulating fluidized bed boiler using the petroleum coke is an inorganic oxide generated in the combustion process using petroleum coke as a circulating fluidized bed boiler fuel, as shown in Table 1 below, mainly CaO, SiO ₂ , f-CaO, It is composed of inorganic oxides such as SO ₃ . The fly ash generated in the circulating fluidized bed boiler using the petroleum coke is mixed with other components of the crude steel-type cement-based binder, and is used to improve initial strength expression while improving low hydration heat expression characteristics and durability. Fly ash generated in the circulating fluidized bed boiler using the above-mentioned Petro Coke uses a CaO component of 50% by weight or more, and by the stimulation effect of Ca(OH) ₂ generated by reaction with water, other components of the crude steel cement-based binder The pozzolanic reaction is activated at an early stage to increase the initial strength.

The fly ash generated in the circulating fluidized bed boiler using the petroleum coke is preferably contained in an amount of 1 to 10% by weight relative to the crude steel cement-based binder. If the content of fly ash generated in the circulating fluidized bed boiler using the petroleum coke is too small, the initial strength may be lowered due to insufficient formation of ettringite crystals due to the pozzolanic reaction, and in the circulating fluidized bed boiler using the petroleum coke. If the content of the generated fly ash is too large, the degree of improvement of the initial strength compared to the input amount may be insignificant, and is preferably performed within the aforementioned content range.

The desulfurized gypsum generated in the circulating fluidized bed boiler using the petroleum coke is a by-product generated in the process of removing sulfur oxides generated in the combustion process using petroleum coke as the fuel for the circulating fluidized bed using a flue gas desulfurization device, as shown in Table 1 below. As shown, it is mainly composed of inorganic oxides such as CaO and SO ₃ . The desulfurized gypsum generated in the circulating fluidized bed boiler using the Petro Coke is mixed with other components of the crude steel type cement-based binder to generate needle-like ethringite crystals through a hydration reaction, and the produced ethringsite is a hydrate tissue. It plays a role in promoting the condensation and affecting the initial strength by making it dense and hard. In addition, the large amount of sulfur trioxide (SO ₃ ) contained in the Petrocox flue gas desulfurization gypsum reacts with the fine powder of the blast furnace slag to contribute to the improvement of initial strength.

It is preferable that the desulfurized gypsum generated in the circulating fluidized bed boiler using the petroleum coke is contained in an amount of 1 to 10% by weight with respect to the crude steel cement-based binder. If the content of desulfurized gypsum generated in the circulating fluidized bed boiler using the petroleum coke is too small, the initial strength may be lowered due to insufficient formation of ettringite crystals due to the pozzolanic reaction, and in the circulating fluidized bed boiler using the petroleum coke If the content of the generated desulfurized gypsum is too large, the degree of improvement of the initial strength compared to the input amount may be insignificant, and it is preferable to be carried out within the above-mentioned content range.

The latex polymer modifier is 40 to 80% by weight of acrylonitrile-butadiene-styrene, 15 to 45% by weight of calcium-alginate beads carrying rubber latex, 1 to 10% by weight of curing accelerator, and 0.5 to 5% by weight of coagulation retarder By using what is included, the adhesion strength is improved, and in particular, the resistance to cracking is very excellent, so that shrinkage and expansion due to changes in external temperature are reduced. In addition, basic properties such as strength, freezing resistance, chemical resistance, water resistance, and water resistance are also improved.

The latex polymer modifier is preferably contained in 0.5 to 15% by weight in the crude steel cement concrete composition according to an embodiment of the present invention. If the content of the latex polymer modifier is too small, curing time, workability, strength and the above-mentioned improvement effect may be weak, and if the content of the latex polymer modifier is too large, material separation is likely to occur, and the hydration reaction is delayed to initiate Compressive strength may be lowered and price competitiveness may be reduced.

The acrylonitrile-butadiene-styrene is mixed with other components of the latex polymer modifier to improve excellent miscibility, adhesion, strength, freezing resistance, chemical resistance, water resistance, water resistance, and durability. . The acrylonitrile-butadiene-styrene is preferably contained in an amount of 40 to 80% by weight relative to the latex polymer modifier. If the content of the acrylonitrile-butadiene-styrene is too small, the above-mentioned improvement effect may be weak, and when the content of the acrylonitrile-butadiene-styrene is too large, workability is improved, but stability is lowered and the concrete There is a problem that the initial strength expression may be lowered or the price competitiveness may be lowered.

The rubber-latex-supported calcium-alginate beads are mixed with other components of the latex polymer modifier to improve the adhesion strength, in particular, to provide a buffer structure to dramatically improve the resistance to cracking, thereby changing the external temperature. Accordingly, there is an effect of reducing shrinkage and expansion. In addition, basic properties such as strength, freezing resistance, chemical resistance, water resistance, and water resistance are also improved. The above-mentioned effect may be further improved by using the rubber-latex-supported calcium-alginate beads having an average particle diameter of 1 to 50 μm.

The rubber latex-supported calcium-alginate beads are preferably contained in an amount of 15 to 45% by weight relative to the latex polymer modifier. If the content of the calcium-alginate beads on which the rubber latex is supported is too small, the above-mentioned improvement effect may be weak, and when the content of the calcium-alginate beads on which the rubber latex is supported is too large, strength characteristics such as compressive strength may be obtained. On the contrary, there is a problem that the price competitiveness may be lowered.

A schematic image of the calcium-alginate beads 1 loaded with rubber latex is illustrated in FIG. 1.

At this time, the rubber latex 10 is butadiene or isoprene 65 to 95 parts by weight and styrene, acrylonitrile, divinylbenzene, at least one vinyl selected from the group consisting of alkyl acrylate-based ethyl acrylate and butyl acrylate What contains 5 to 35 parts by weight of a monomer may be used.

In addition, it is preferable to use a polymer polymerized such that the rubber latex has an average particle diameter of 10 to 90 nm.

More specifically, the calcium-alginate beads 1 on which the rubber latex 10 is supported include forming a mixed solution by stirring the rubber latex dispersion aqueous solution and the calcium chloride aqueous solution at a constant rate; Adding sodium (Na) alginate aqueous solution dropwise to the mixed solution to synthesize calcium-alginate beads carrying rubber latex; And washing and drying the synthesized rubber latex-supported calcium-alginate beads.

The rubber latex dispersion aqueous solution and the calcium chloride aqueous solution may form a mixed solution by stirring the rubber latex dispersion aqueous solution having a concentration of 30 to 60% by weight and the calcium chloride aqueous solution having a concentration of 0.1 to 2.0 M at a ratio of 1: 1 to 3.

In this case, the rubber latex dispersion aqueous solution further comprises 0.5 to 5% by weight of a fatty acid potassium salt relative to 100% by weight of the rubber latex dispersion aqueous solution, thereby improving the dispersibility of the rubber latex.

In addition, a solution of sodium (Na) alginate at a concentration of 0.5 to 2% by weight is added dropwise to the mixed solution to synthesize calcium-alginate beads carrying rubber latex.

The surface of the rubber-latex-supported calcium-alginate beads is coated with a fluorine-based rubber 20, wherein the fluorine-based rubber is obtained by copolymerizing VDF (vinylidenefluoride) and HFP (hexafluoropropylene). , Mixed with other components of the latex polymer modifier, it has the effect of further improving the excellent miscibility, adhesion, and chemical resistance. Especially. The VDF (vinylidenefluoride) and HFP (hexafluoropropylene) have an effect capable of further improving the above-described effect by using a copolymerized with a weight ratio of 1:2 to 5. A schematic image of the calcium-alginate beads 1 carrying the rubber latex 10 coated with the fluorine-based rubber 20 is shown in FIG. 2.

In addition, the fluorine-based rubber is used by further containing 10 to 20 parts by weight of at least one inorganic powder 30 selected from the group consisting of alumina, silica and mixtures thereof, based on 100 parts by weight of the fluorine-based rubber, the above In addition to the effect, the latex polymer modifier is mixed with other components, and thus has an effect of further improving excellent strength and freezing resistance. FIG. 3 shows a schematic image of the calcium-alginate beads 1 carrying the rubber latex 10 coated with the fluorine-based rubber 20 including the inorganic powder 30.

The curing accelerator acts to promote the initial strength expression by activating the hydration reaction of the crude steel cement concrete composition, thereby exhibiting cement compressive strength capable of passing automobiles within a short period of time. The curing accelerator may further improve the above-described effect by using at least one selected from the group consisting of triethanol amine, calcium silicate, calcium chloride, lithium carbonate, and mixtures thereof.

The curing accelerator is preferably contained in 1 to 10% by weight relative to the latex polymer modifier. If the content of the curing accelerator is too small, the initial curing rate may be delayed, and if the content of the curing accelerator is too large, the curing rate increases, but the initial hydration heating value increases, resulting in fine cracks in the concrete after curing and durability. There is a problem that can degrade.

The condensation retardant is used to maintain the initial working time and improve workability. The coagulation retarder may further improve the above-described effect by using at least one selected from the group consisting of zinc chloride, phosphate, zinc carbonate, citric acid, alkali metal citrate, lignin sulfonic acid, polyvinyl alcohol, and mixtures thereof. .

It is preferable that the coagulation retarder is contained in an amount of 0.5 to 5% by weight relative to the latex polymer modifier. If the content of the coagulation retarder is too small, the initial coagulation retardation effect cannot be expected, resulting in poor workability, and if the content of the coagulation retardant is too large, there is a problem that the initial strength expression may be delayed.

Hereinafter, a road pavement repairing method using a crude steel cement concrete composition according to a preferred embodiment of the present invention will be described.

More specifically, another embodiment of the present invention includes the steps of cutting and chipping a road surface using a crusher and a water jet to remove deteriorated parts and impurities; Cleaning the removed area; Maintaining a wet state by sprinkling the cleaned area; After maintaining the wet state, a step of blooming or primer treatment to obtain a high adhesion and waterproof effect; Pouring the crude steel cement concrete composition of the present invention on the top of the blooming or primer treatment; Spraying a curing agent to prevent initial plastic cracking by preventing evaporation of water at the top after pouring; A step of tinting to increase crack resistance and slip resistance after spraying the curing agent; And it provides a road pavement repairing method using a crude steel cement concrete composition comprising a curing step.

The curing step, depending on the atmospheric conditions including the temperature, humidity, and wind intensity at the site, 1) spray only the curing agent, or 2) spray the curing agent and cover it with vinyl or cure cloth on the top to sprinkle it in a wet state Or 3) After spraying the curing agent, it is recommended to apply the separation step while curing while maintaining the thermal insulation by using a vinyl, curing cloth, or a thermal insulation cover.

Particularly, in the curing step, in the case of high atmospheric conditions (for example, high air temperature (25°C or higher), low relative humidity, and windy atmospheric conditions, such as in the summer), after spraying the curing agent, vinyl, curing cloth, etc. Cover and sprinkle to maintain the wet condition.On the contrary, if the air temperature is not high (below 25℃), the relative humidity is high, and the wind is low, only the curing agent is sprayed and cured.) After spraying, it can be applied separately by covering the vinyl, curing cloth, etc., and sprinkling it while maintaining the wet state. In addition, when the atmospheric temperature is 5 ℃ or less, after spraying the curing agent may further include the step of performing a heat-resistant curing using a vinyl, curing cloth, heat insulating cover.

Hereinafter, the blooming or primer treatment is used to mean an operation to facilitate the adhesion of the crude steel cement concrete composition to the concrete slab. The blooming material is at least one selected from the polymer-based binder, SBR (Styrene Butadiene Rubber) latex, poly acryl ester (PAE), epoxy emulsion, ethyl vinyl acetate (EVA), and acrylic emulsion. You can select and use. The primer material may be selected from at least one selected from SBR (Styrene Butadiene Rubber) latex, poly acryl ester (PAE), epoxy emulsion, ethyl vinyl acetate (EVA), and acrylic emulsion. Can.

The crude steel cement concrete composition according to an embodiment of the present invention includes a latex polymer modifier containing a calcium-alginate bead carrying a crude steel type cement-based binder and rubber latex, and thus has an excellent roughness and watertightness, greatly reducing the construction period. There is. In addition, the adhesion strength is improved, in particular, the resistance to cracking is very excellent, and there is an effect of reducing shrinkage and expansion due to changes in external temperature. In addition, basic properties such as strength, freezing resistance, chemical resistance, water resistance, and water resistance are also improved.

As described above, the preferred embodiment of the present invention has been described in detail, but the present invention is not limited to the above embodiment, and various modifications by those skilled in the relevant art within the scope of the technical spirit of the present invention This is possible.

<Production Example>

Preparation of rubber-latex-supported calcium-alginate beads

70 parts by weight of isoprene, 20 parts by weight of styrene and 10 parts by weight of butyl acrylate were mixed and dispersed in purified water to a concentration of about 35% by weight, and 1.5% by weight of potassium salt of alpha-sulfo fatty acid alkyl ester By mixing, an aqueous dispersion of rubber latex was prepared. Thereafter, the prepared rubber latex dispersion aqueous solution and the 1.2 M concentration calcium chloride aqueous solution were stirred at a 1:2 volume ratio to form a mixed solution.

Subsequently, an aqueous sodium (Na) alginate solution having a concentration of 1.8 wt% was added dropwise to the mixed solution to synthesize calcium-alginate beads carrying rubber latex, and washing and drying the calcium-alginate beads carrying the synthesized rubber latex. , Calcium-alginate beads carrying rubber latex were prepared.

Thereafter, the surface of the calcium-alginate beads on which the rubber latex was supported was coated with a fluorine-based rubber. In this case, the fluorine-based rubber was mixed with 5 parts by weight of alumina and 5 parts by weight of silica with respect to 100 parts by weight of VDF (vinylidenefluoride) and HFP (hexafluoropropylene) copolymerized at a weight ratio of 1:2.

<Examples 1 to 3 and Comparative Examples 1 to 3>

After adding the crude cement type binder, fine aggregate and coarse aggregate mixed with the ingredients and contents as shown in Table 2 to the forced mixing mixer, mix for 3 minutes under dry mixing conditions, and the ingredients and contents as shown in Table 2 below. The mixed water and latex polymer modifier were simultaneously added and mixed for 1 minute and 30 seconds to prepare a crude steel cement concrete composition.

<Test Example>

To evaluate the properties of the crude steel cement concrete compositions according to Examples 1 to 3 of the present invention and the concrete compositions according to Comparative Examples 1 to 3 so that the properties of the crude steel cement concrete composition according to the present invention can be more specifically identified and the results are as follows. It is shown in Table 3.

As can be seen from Table 3, it was confirmed that the crude steel cement concrete compositions according to Examples 1 to 3 had a small rate of change in length due to drying shrinkage, as compared with the concrete compositions according to Comparative Examples 1 to 3.

In addition, the crude steel cement concrete compositions according to Examples 1 to 3 have excellent compressive strength, flexural strength and adhesion strength compared to the concrete compositions according to Comparative Examples 1 to 3; It was confirmed that it has excellent salt penetration resistance, freeze-thaw resistance and abrasion resistance.

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 its technical spirit or essential features. Therefore, the embodiments described above are all illustrative and should be understood as not limiting. The scope of the present invention should be construed to include all modified or modified forms derived from the equivalent concept and meaning and scope of the claims, which will be described later, rather than the detailed description.

1: Calcium-alginate beads with rubber latex
10: rubber latex 20: fluorine-based rubber 30: inorganic powder

Claims (5)

In the crude steel cement concrete composition,
5 to 30% by weight of the coarse cement type binder, 20 to 60% by weight of fine aggregate, 20 to 60% by weight of coarse aggregate, 0.1 to 10% by weight of water, and 0.5 to 15% by weight of latex polymer modifier,
The crude cement type binder is usually 20 to 50% by weight of Portland cement, at least one selected from the group consisting of crude steel cement, calcium sulfoaluminate cement, and mixed cements thereof, and crude steel cement having a powder strength of 4,500 to 8,000 ㎠/g 10 to 40% by weight, 7 to 20% by weight of fine powder of blast furnace slag having 6,000 to 12,000 cm 2 /g of powder, 5 to 15% by weight of gypsum, 5 to 15% by weight of fly ash generated in a thermal power plant, circulating fluidized bed using Petrocoke 1 to 10% by weight of fly ash generated in the boiler and 1 to 10% by weight of desulfurized gypsum generated in a circulating fluidized bed boiler using Petro Coke;
The latex polymer modifier is 40 to 80% by weight of acrylonitrile-butadiene-styrene, 15 to 45% by weight of calcium-alginate beads carrying rubber latex, 1 to 10% by weight of curing accelerator, and 0.5 to 5% by weight of coagulation retarder It characterized in that it comprises a crude steel cement concrete composition.
According to claim 1,
The rubber-latex supported calcium-alginate beads
Forming a mixed solution by stirring the rubber latex dispersion aqueous solution and the calcium chloride aqueous solution at a constant rate;
Adding sodium (Na) alginate aqueous solution dropwise to the mixed solution to synthesize calcium-alginate beads carrying rubber latex; And
It is manufactured by a manufacturing method comprising washing and drying the synthesized rubber latex-supported calcium-alginate beads;
The rubber latex is butadiene or isoprene 65 to 95 parts by weight and styrene, acrylonitrile, divinylbenzene, alkyl acrylate-based ethyl acrylate and butyl acrylate selected from the group consisting of 5 to 35 weights of one or more vinyl monomers A crude steel cement concrete composition comprising a portion.
According to claim 1,
The calcium-alginate beads on which the rubber latex is supported are coated with a fluorine-based rubber,
The fluorine-based rubber is VDF (vinylidenefluoride) and HFP (hexafluoropropylene) coarse steel cement concrete composition characterized in that the copolymerization.
The method of claim 3,
The fluorine-based rubber is based on 100 parts by weight of the fluorine-based rubber,
A crude steel cement concrete composition further comprising 10 to 20 parts by weight of at least one inorganic powder selected from the group consisting of alumina, silica and mixtures thereof.
A road pavement repairing method using the crude steel cement concrete composition according to any one of claims 1 to 4,
Cutting and chipping the road surface using a crusher and a water jet to remove deteriorated areas and impurities; Cleaning the removed area; Maintaining a wet state by sprinkling the cleaned area; After maintaining the wet state, the step of blooming or primer treatment; Pouring the crude steel cement concrete composition of the present invention on the top of the blooming or primer treatment; Spraying a curing agent to prevent initial plastic cracking by preventing evaporation of water at the top after pouring; A step of tinting to increase crack resistance and slip resistance after spraying the curing agent; And Road pavement repair method using a crude steel cement concrete composition comprising the step of curing.

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