KR102133427B1 - Latex modified ultra rapid harding concrete composition having improved chloride iontophoretic resistance and durability and a repairing method of road pavement using the same - Google Patents

Abstract

The present invention relates to a latex modified ultra rapid hardening concrete composition having improved chloride ion penetration resistance and durability, which includes 10 to 30 wt% by weight of ultra rapid hardening cement binder, 30 to 60 wt% of fine aggregate, 20 to 50 wt% of coarse aggregate, 1 to 20 wt% of latex modifying admixture, and 1 to 20 wt% of mixing water. Accordingly, the strength characteristics are developed early to minimize a traffic control period.

Description

Latex modified ultra rapid harding concrete composition having improved chloride iontophoretic resistance and durability and a repairing method of road pavement using the same}

The present invention relates to a latex modified quick-hardening concrete composition having excellent salt resistance and durability, which can minimize the traffic control period by allowing the strength characteristics to be expressed early, and a road pavement repairing method using the same.

In general, cement concrete has been used to manufacture various concrete structures. The cement concrete has an advantage of good workability, but has a high water permeability, which causes the concrete to deteriorate due to the penetration of chloride or moisture.

In particular, when the reinforced concrete structure is installed under the marine environment, the salt in the seawater penetrates into the concrete, or when the calcium chloride used in the snow removal operation in winter penetrates into the concrete in the bridge, the rebar embedded in the concrete can be very easily corroded. The corroded reinforcing bar expands and cracks the concrete.

In addition, the fast-hardening cement concrete structures and pavements contract and expand to a greater extent than the designed amount depending on the change in the external temperature when exposed for a long period of time at an extremely high temperature or an extremely low temperature. As a result, in severe cases, the stress of length change occurs excessively, resulting in cracks due to ridges, settlements, or twists between the concrete separators, thereby causing serious damage and durability of structures and packages.

To solve the above problems, latex modified concrete (Latex Modified Concrete) has been developed and used to form a watertight structure by adding SBR (Styrene-Butadiene Rubber) latex to general concrete in the early 2000s. More specifically, Korean Patent Registration No. 10-0421255 describes a technique of using latex modified concrete in which SBR (styrene-butadiene rubber) latex is added to concrete repair and reinforcement work. However, in the above technology, the SBR latex is specified only for the bridge construction of new bridges, and the latex is specialized in ordinary Portland cement (one type of cement), so that the difference in constituents of cement is significantly different from other fast-hardening or rough-hardening cements. There are difficulties in application, and the performance is also limited in maintaining the required adhesion strength between deteriorated or neutralized gas concrete and repaired latex modified concrete.

In addition, when using SBR latex to produce modified quick-hard and rough-strengthened concrete according to the above-mentioned contents, there was a problem that surface peeling phenomenon of concrete occurred severely when the temperature of the following year rises due to a decrease in freeze-thaw stability during winter. .

Republic of Korea Registered Patent No. 10-0421255 Republic of Korea Registered Patent No. 10-1222086

The present invention has been devised to solve the above-mentioned problems, and an embodiment of the present invention can minimize the traffic control period by allowing the strength characteristics to be expressed early, and the latex modified quick-hardening concrete having excellent salt penetration resistance and durability. 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 latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability.

The 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.

One embodiment of the present invention includes a quick-hardening cement binder 10 to 30% by weight, fine aggregate 30 to 60% by weight, coarse aggregate 20 to 50% by weight, latex modified admixture 1 to 20% by weight and 1 to 20% by weight In the latex modified quick-hardening concrete composition excellent in salt penetration resistance and durability; The fast-hardening cement bonding material is 20 to 50% by weight of crude steel Portland cement, 20 to 30% by weight of metakaolin, blast furnace slag fine powder of 15 to 20% by weight of 6,000 to 12,000 cm 2 /g, and powder of 4,500 to 8,000 ㎠/ 5 to 30% by weight of calcium sulfoaluminate, 5 to 15% by weight of gypsum, 1 to 10% by weight of fly ash generated in a circulating fluidized bed boiler using petroleum coke, and 1 to 10 desulfurized gypsum from a circulating fluidized bed boiler using petroleum coke It contains 0.1 to 5% by weight of glass fine powder having a weight% and an average particle diameter of 0.1 to 5㎛;

The latex modified admixture is 30 to 40% by weight of styrene, 30 to 40% by weight of butyl-prop-2-enoate, 1 to 10% by weight of 2-propenamide-co-prop-2-enoic acid, polyvinylamine 100 parts by weight of high performance synthetic latex containing 1 to 10% by weight and 1 to 10% by weight of 2,2-dinitropropyl acrylate, 20 to 30 parts by weight of polysilsesquioxane copolymer, 5 to 15% by weight of sodium silicate aqueous solution Provided is a latex modified quick-drying concrete composition having excellent salt penetration resistance and durability, comprising 5 to 15 parts by weight of alginate-aluminate beads carrying polyketone and collagen.

The latex modified admixture may further include 1 to 10 parts by weight of an alkylphenol novolac resin, 0.1 to 1 part by weight of liquid paraffin, and 0.5 to 5 parts by weight of the mid-kneading skin powder.

The high-performance synthetic latex is introduced into the reactor, sodium dodecylbenzene sulfonate 0.5 to 1% by weight, sodium dodecan sulfonate 0.1 to 0.3% by weight and an emulsifier composition comprising 0.1 to 0.3% by weight of abitic acid; After raising the temperature of the reactor to 75 to 85°C, styrene 30 to 40% by weight, butyl-prop-2-enoate 30 to 40% by weight, 2-propenamide-co-prop-2-enoic acid 1 to 10% by weight, 1 to 10% by weight of polyvinylamine and 1 to 10% by weight of 2,2-dinitropropyl acrylate were added, and 0.05 to 0.1% by weight of potassium persulfate was additionally added. Initiating a reaction; And 4 to 5 hours after the reaction was initiated, 0.05 to 0.1% by weight of tertiary-butyl hydro peroxide and 0.05 to 0.1% by weight of potassium persulfate were added to the reaction. Terminating; may be used to be prepared by a manufacturing method comprising.

Preparing a composite aqueous solution by mixing the aqueous solution of sodium (Na) alginate and aqueous sodium (Na) aluminate with the alginate-aluminate beads carrying the polyketone and collagen; Synthesizing alginate-aluminate beads carrying polyketone and collagen by dropwise adding the composite aqueous solution to an aqueous calcium chloride solution; And washing and drying the alginate-aluminate beads carrying the synthesized polyketone and collagen.

Another embodiment of the present invention is a road pavement repairing method using a latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to one embodiment of the present invention,

Cutting and blasting the road surface using a crusher, a planing machine, a shot blaster, a water jet, etc., to remove raytans, impurities and deterioration sites; 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 a latex-modified fast-hardening concrete composition excellent in salt penetration resistance and durability of the present invention on the upper part of the blooming or primer treatment; Post-pouring, to cause cracking and sliding to increase the resistance; Road pavement repairing method using a latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability, including a step of spraying a curing agent and a step of curing to prevent initial plastic cracking by preventing evaporation of moisture at the top after the tining step Gives

The latex-modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to an embodiment of the present invention includes a fast-hardening cement binder and a latex-modifying admixture to promote initial hydration of cement and densification of tissues to make dense concrete. It is possible to secure the initial strength after application, thereby greatly improving the curing speed of mortar, thereby minimizing traffic control time.

In addition, the salt penetration resistance is significantly improved, so that the effect of maintenance can be maintained for a long time. In addition, there is an excellent effect of chemical resistance, water resistance and freeze-thaw resistance. In addition, the adhesion performance with the existing bridge packaging is excellent, and the mechanical properties such as flexural strength, tensile strength and compressive strength are very strengthened, thereby preventing the surface cracking and expansion and destruction of concrete.

Thus, the concrete pavement repairing method using a latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to an embodiment of the present invention improves the mechanical properties of concrete, neutralizes it, and suppresses corrosion of concrete by chloride, By improving the freeze-thaw resistance according to the temperature change, there is an effect that can extend the overall durability and life cycle of the concrete.

1 shows a schematic image of alginate-aluminate beads carrying polyketone and collagen.

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 thereby, and the present invention is only defined by the scope of claims to be described later.

One embodiment of the present invention includes a quick-hardening cement binder 10 to 30% by weight, fine aggregate 30 to 60% by weight, coarse aggregate 20 to 50% by weight, latex modified admixture 1 to 20% by weight and 1 to 20% by weight In the latex modified quick-hardening concrete composition excellent in salt penetration resistance and durability; The fast-hardening cement bonding material is 20 to 50% by weight of crude steel Portland cement, 20 to 30% by weight of metakaolin, blast furnace slag fine powder of 15 to 20% by weight of 6,000 to 12,000 cm 2 /g, and powder of 4,500 to 8,000 ㎠/ 5 to 30% by weight of calcium sulfoaluminate, 5 to 15% by weight of gypsum, 1 to 10% by weight of fly ash generated in a circulating fluidized bed boiler using petroleum coke, and 1 to 10 desulfurized gypsum from a circulating fluidized bed boiler using petroleum coke It contains 0.1 to 5% by weight of glass fine powder having a weight% and an average particle diameter of 0.1 to 5㎛; The latex modified admixture is 30 to 40% by weight of styrene, 30 to 40% by weight of butyl-prop-2-enoate, 1 to 10% by weight of 2-propenamide-co-prop-2-enoic acid, polyvinylamine 100 parts by weight of high performance synthetic latex containing 1 to 10% by weight and 1 to 10% by weight of 2,2-dinitropropyl acrylate, 20 to 30 parts by weight of polysilsesquioxane copolymer, 5 to 15% by weight of sodium silicate aqueous solution Provided is a latex modified quick-drying concrete composition having excellent salt penetration resistance and durability, comprising 5 to 15 parts by weight of alginate-aluminate beads carrying polyketone and collagen.

More specifically, the latex modified quick-hardening concrete composition having excellent salt permeation resistance and durability according to one embodiment of the present invention is 10 to 30% by weight of the fast-hardening cement binder, 30 to 60% by weight of fine aggregate, 20 to 50% by weight of coarse aggregate, 1 to 20% by weight of the latex modified admixture and 1 to 20% by weight of the compounding water.

The aggregate used in the present invention is divided into a fine aggregate and a coarse aggregate, and a particle having a particle diameter of 5 mm or less is called a fine aggregate, and a particle having a particle size greater than 5 mm is divided into a coarse aggregate. The fine aggregate preferably contains 30 to 60% by weight in the latex modified quick-hardening concrete composition having excellent salt permeation resistance and durability of the present invention, and the coarse aggregate is in the latex modified quick-hardening concrete composition excellent in salt penetration resistance and durability of the present invention. It is preferably contained 20 to 50% by weight.

The fast-hardening cement binder used in the present invention is 20 to 50% by weight of crude steel portland cement, 20 to 30% by weight of metakaolin, and 15 to 20% by weight of fine powder of blast furnace slag having 6,000 to 12,000 cm 2 /g, 4,500 to 8,000 ㎠/g of calcium sulfoaluminate 5 to 30% by weight, gypsum 5 to 15% by weight, 1 to 10% by weight of fly ash generated in a petroleum coke circulating fluidized bed boiler, generated in a circulating fluidized bed boiler using petro coke Using desulfurized gypsum containing 1 to 10% by weight and 0.1 to 5% by weight of glass fine powder having an average particle size of 0.1 to 5 µm, it is possible to make dense concrete by promoting initial hydration of cement and densification of tissue, Afterwards, the initial strength can be secured, which greatly improves the mortar's curing speed, thereby minimizing traffic control time. In addition, by mixing with the latex modified admixture of the present invention, the salt penetration resistance is significantly improved, there is an effect that the maintenance effect can be maintained for a long time. In addition, there is an excellent effect of chemical resistance, water resistance and freeze-thaw resistance. In addition, the adhesion performance with the existing bridge packaging is excellent, and the mechanical properties such as flexural strength, tensile strength and compressive strength are very strengthened, thereby preventing the surface cracking and expansion and destruction of concrete.

It is preferable to use the crude steel Portland cement specified in KS, and the powder strength of 4,000 to 8,500 cm 2 /g may be used to further improve the effect of improving fast-hardness and initial strength. The crude steel Portland cement is preferably contained in an amount of 20 to 50% by weight relative to the fast-hardening cement binder. If the content of the crude steel Portland cement is too small, the above-described initial strength improvement effect may be weak, and if the content of the crude Portland cement is too large, the initial strength is enhanced, but there is a problem that cracking may occur.

The metakaolin is a kaolin industrial by-product, and is mixed with other components of the fast-hardening cement binder, and is used to enhance durability according to an increase in initial strength and water tightness and adhesion. The metakaolin may have a powderiness of 5,000 to 10,000 cm 2 /g to further improve the above-described effect, and in particular, it is mixed with other components of the fast-hardening cement binder to further improve pozzolanic reactivity. It has the effect of improving long-term strength.

It is preferable that the metakaolin is contained in an amount of 20 to 30% by weight relative to the fast-hardening cement binder. If the content of the metakaolin is too small, the above-mentioned improvement effect may be weak, and if the content of the metakaolin is too large, there is a problem that the initial strength expression may be delayed.

The blast furnace slag fine powder is a by-product generated in the iron and steel industry, and is mixed with other components of the fast-hardening cement 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. In particular, the fine powder of the blast furnace slag may be used to 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 fast-hardening cement binder to obtain an initial compressive strength. It has the effect of improving.

The blast furnace slag powder is preferably contained in 15 to 20% by weight relative to the fast-hardening cement binder. If the content of the blast furnace slag fine powder is too small, the initial compressive strength may be reduced or the above-mentioned improvement effect may be weak, and if the blast furnace slag fine powder content is too large, unreacted blast furnace slag is potentially present and the initial compressive strength. There is a problem that expression may be lowered.

The calcium sulfoaluminate is a fast-hardening material, and when mixed with cement, it is possible to obtain the compressive strength of ordinary Portland cement obtained in days or days within hours. The calcium sulfoaluminate has an Al ₂ O ₃ content of 30% by weight or more, and a powder of 4,500 to 8,000 cm 2 /g, which can be appropriately reacted at an early stage, thereby exhibiting initial strength.

It is preferable that the calcium sulfoaluminate is contained in an amount of 5 to 30% by weight relative to the fast-hardening cement binder. If the content of the calcium sulfoaluminate is too small, the above-mentioned improvement effect may be weak, and if the content of the calcium sulfoaluminate is too large, there is a problem that price competitiveness may be deteriorated.

The gypsum is mixed with other components of the fast-hardening cement 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.

The gypsum is preferably contained in 5 to 15% by weight relative to the quick-setting cement 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 deteriorate. There is a problem that can be.

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 quick-hardening cement binder, and is used to improve initial strength expression while improving low hydration heat expression characteristics and durability. Using that this is greater than or equal to the fly ash generated in the circulating fluidized bed boiler with petro coke is the CaO component and 50% by weight, by Ca stimulating effect of (OH) ₂ produced by the water reaction with the other components of the in hard cement binder Their pozzolanic reaction is activated at an early stage and has an effect of increasing 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 fast-hardening cement 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 a 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 petroleum coke is mixed with other components of the fast-hardening cement binder to generate needle-like ethringite crystals through a hydration reaction, and the produced ethringite is a hydrate. It acts as a dense and hard tissue to accelerate condensation and affect initial strength. 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 fast-hardening cement 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 by 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 is preferably performed within the aforementioned content range.

The glass fine powder is mixed with other components of the fast-hardening cement binder to increase adhesion and water tightness, increase strength and viscosity of concrete, prevent cracking, and prevent shrinkage and expansion of concrete. The glass fine powder has an average particle size of 0.1 to 5 μm, and thus has an effect of further increasing impact resistance and tensile force.

It is preferable that the glass fine powder is contained in an amount of 0.1 to 5% by weight relative to the fast-hardening cement binder. If the content of the fine glass powder is too small, the above-mentioned improvement effect may be weak, and if the content of the fine glass powder is too large, there is a problem that price competitiveness may be deteriorated.

It is preferable that the fast-hardening cement bonding material is contained in an amount of 10 to 30% by weight with respect to the high-performance latex modified cemented carbide concrete composition according to one embodiment of the present invention. When the content of the fast-hardening cement binder is too small, the viscosity of the unconsolidated concrete and the likelihood of bleeding increase, and thus the likelihood of plastic cracking may also increase. In addition, water permeation resistance may be reduced due to a decrease in strength and water tightness of concrete. In addition, if the mixed content of the fast-hardening cement binder is too large, viscosity increases, workability decreases, pot life is difficult to control, initial strength decreases, and long-term strength continues to increase due to excessive watertightness increase. Dry shrinkage cracking of the package may occur.

On the other hand, the latex modified admixture used in the present invention is 30 to 40% by weight of styrene, 30 to 40% by weight of butyl-prop-2-enoate, 1 to 2-propenamide-co-prop-2-enoic acid 100 parts by weight of high-performance synthetic latex comprising 10% by weight, 1-10% by weight of polyvinylamine and 1-10% by weight of 2,2-dinitropropyl acrylate, 20-30 parts by weight of polysilsesquioxane copolymer, By using 5 to 15 parts by weight of sodium silicate aqueous solution and 5 to 15 parts by weight of alginate-aluminate beads carrying polyketone and collagen, the salt penetration resistance is dramatically improved, and the effect that the repair effect can be maintained for a long time have. In addition, there is an excellent effect of chemical resistance, water resistance and freeze-thaw resistance. In addition, the adhesion performance with the existing bridge packaging is excellent, and the mechanical properties such as flexural strength, tensile strength and compressive strength are very strengthened, thereby preventing the surface cracking and expansion and destruction of concrete.

It is preferable that the latex modified admixture is contained in 1 to 20% by weight in a latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to an embodiment of the present invention. If the content of the latex modified admixture is too small, the effect of improving curing time, workability, strength and durability may be weak, and if the content of the latex modified admixture 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 decrease.

The high-performance synthetic latex is mixed with other components of the latex modified admixture to provide excellent strength characteristics, as well as excellent chemical resistance and waterproofness, and, in particular, significantly improve resistance to freeze-thawing and salt damage.

The high-performance synthetic latex is styrene 30 to 40% by weight, butyl-prop-2-enoate 30 to 40% by weight, 2-propenamide-co-prop-2-enoic acid 1 to 10% by weight, polyvinyl The above-described effect can be further improved by using what is obtained by emulsion polymerization of 1 to 10% by weight of amine and 1 to 10% by weight of 2,2-dinitropropyl acrylate.

At this time, the styrene gives stiffness to the polymerized high-performance synthetic latex and can control the compressive strength and hardness of the latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to an embodiment of the present invention. . The styrene is preferably contained 30 to 40% by weight in consideration of the polymerization rate.

In addition, the butyl-prop-2-enoate gives ductility to the polymerized high-performance synthetic latex, and is effective in improving the flexural strength of the latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to an embodiment of the present invention. In particular, it is possible to reinforce the adhesion performance with the existing bridge packaging. The butyl-prop-2-enoate is preferably contained 30 to 40% by weight in consideration of the polymerization rate.

In addition, the 2-propenamide-co-prop-2-enoic acid improves the miscibility of the components to be emulsified and polymerized, so that components having different effects can be evenly polymerized, and self-healing properties and adhesion. By improving, there is an effect that can further improve the mechanical properties of the concrete, such as compressive strength, bending strength and adhesion strength. The 2-propenamide-co-prop-2-enoic acid is preferably contained in an amount of 1 to 10% by weight in consideration of the above-described effect.

In addition, the polyvinylamine reinforces the stiffness of the polymerized high-performance synthetic latex, the tensile strength of the latex modified quick-hardening concrete composition having excellent cross-linking of the main chain and salt penetration resistance and durability according to an embodiment of the present invention. Can increase. Accordingly, it is possible to maintain the tensile strength between the latex-cement and latex-aggregate due to the traffic volume vibration and improve the resistance to cross-sectional destruction. It is preferable that the polyvinylamine is contained in an amount of 1 to 10% by weight in consideration of the above-described effect.

In addition, the 2,2-dinitropropyl acrylate may enhance the long-term strength of concrete by increasing the bonding force between latex particles, latex particles and cement, and aggregate particles. The 2,2-dinitropropyl acrylate is preferably contained in 1 to 10% by weight in consideration of the above-described effect.

More specifically, the high-performance synthetic latex, in the reactor, sodium dodecylbenzene sulfonate 0.5 to 1% by weight, sodium dodecane sulfonate 0.1 to 0.3% by weight, and the step of introducing an emulsifier composition comprising 0.1 to 0.3% by weight of abitic acid ; After raising the temperature of the reactor to 75 to 85°C, styrene 30 to 40% by weight, butyl-prop-2-enoate 30 to 40% by weight, 2-propenamide-co-prop-2-enoic acid 1 to 10% by weight, 1 to 10% by weight of polyvinylamine and 1 to 10% by weight of 2,2-dinitropropyl acrylate were added, and 0.05 to 0.1% by weight of potassium persulfate was additionally added. Initiating a reaction; And 4 to 5 hours after the reaction was initiated, 0.05 to 0.1% by weight of tertiary-butyl hydro peroxide and 0.05 to 0.1% by weight of potassium persulfate were added to the reaction. Terminating; may be used to be prepared by a manufacturing method comprising.

The polysilsesquioxane copolymer is mixed with other components of the latex modified admixture to improve adhesion strength, reduce shrinkage cracks that occur at the beginning of curing, and improve the fatigue and abrasion resistance of the composition. . The polysilsesquioxane copolymer may further improve the above-described effect by using polypropylsilsesquioxane and polymethylsilsesquioxane in a 1: 1 weight ratio.

The polysilsesquioxane copolymer is preferably contained in 20 to 30 parts by weight based on 100 parts by weight of the high-performance synthetic latex. If the content of the polysilsesquioxane copolymer is too small, the above-mentioned improvement effect may be weak, and if the polysilsesquioxane copolymer is too large, there is a problem that workability and price competitiveness may be deteriorated.

The aqueous sodium silicate solution is mixed with other components of the latex modified admixture to provide excellent adhesion and mechanical stability, prevent surface cracking and expansion and destruction, and in particular, resistance to freezing and thawing and salt damage due to temperature changes It is used to improve. The aqueous sodium silicate solution includes 30 to 40% by weight of sodium oxide (Na ₂ O), 5 to 15% by weight of silicon dioxide (SiO ₂ ), and the remaining amount of water (H ₂ O) to achieve the above effect. It can be improved further.

The aqueous sodium silicate solution is preferably contained in 5 to 15 parts by weight based on 100 parts by weight of the high-performance synthetic latex. If the content of the sodium silicate aqueous solution is too small, the above-mentioned improvement effect may be weak, and when the content of the sodium silicate aqueous solution is too large, there is a problem that workability and price competitiveness may be deteriorated.

The alginate-aluminate beads carrying the polyketone and collagen are mixed with other components of the latex modified admixture, and have excellent adhesion performance with existing bridge packaging, and have very strong mechanical properties such as flexural strength, tensile strength and compressive strength. It has the effect. In particular, by providing a buffer structure to significantly improve the resistance to cracks, there is an effect that can prevent the surface cracking and expansion fracture phenomenon of concrete. In addition, it is excellent in chemical resistance and water resistance, and in particular, it has an effect that the resistance to freeze-thaw and salt damage is dramatically improved, so that the repair effect can be maintained for a long time. The alginate-aluminate beads carrying the polyketone and collagen may further improve the above-described effect by using an average particle diameter of 50 to 200 μm.

In addition, the polyketone has a fineness of 0.5 to 8.0 denier, and a fiber strength of 15 to 50 g/d is used to have a fiber form, the effect described above can be further improved.

The alginate-aluminate beads carrying the polyketone and collagen are preferably contained in 5 to 15 parts by weight based on 100 parts by weight of the high-performance synthetic latex. If the content of the alginate-aluminate beads carrying the polyketone and collagen is too small, the above-mentioned improvement effect may be weak, and if the content of the alginate-aluminate beads carrying the polyketone and collagen is too large, compression There is a problem that strength characteristics such as strength may be lowered or price competitiveness may be lowered.

A schematic image of the alginate-aluminate beads 1 carrying the polyketone 10 and collagen 20 is illustrated in FIG. 1.

More specifically, the alginate-aluminate beads carrying the polyketone and collagen are mixed with an aqueous sodium (Na) alginate solution and an aqueous sodium (Na) aluminate solution, followed by mixing the polyketone and collagen dispersion aqueous solution to prepare a composite aqueous solution. step; Synthesizing alginate-aluminate beads carrying polyketone and collagen by dropwise adding the composite aqueous solution to an aqueous calcium chloride solution; And washing and drying the alginate-aluminate beads carrying the synthesized polyketone and collagen.

The aqueous sodium (Na) alginate solution and the aqueous sodium (Na) aluminate solution have a concentration of 0.5 to 3% by weight of a sodium (Na) alginate aqueous solution and a concentration of 0.1 to 1.5% by weight of a sodium (Na) aluminate aqueous solution in a 100: 100 volume ratio. After mixing with, it is possible to form a composite aqueous solution by mixing 50 to 100 parts by volume of an aqueous solution in which 10 to 20% by weight of polyketone and 10 to 20% by weight of collagen are dispersed.

It is possible to synthesize the alginate-aluminate beads carrying polyketone and collagen by dropwise adding the composite aqueous solution to an aqueous calcium chloride solution having a concentration of 0.1 to 2.0 M.

The latex modified admixture can further improve the mechanical properties of concrete such as compressive strength, flexural strength, and adhesive strength with high strength and adhesion, and further improve the resistance to chloride penetration and freezing and thawing due to temperature change. It may be one that further comprises 1 to 10 parts by weight of the rockfish resin, 0.1 to 1 part by weight of liquid paraffin, and 0.5 to 5 parts by weight of the middling skin powder.

The alkylphenol novolac resin is prepared by a general method used in the art, and the method for producing the resin is not particularly limited. However, for example, the alkylphenol novolak resin is prepared by reacting alkylphenol and formaldehyde in the presence of a catalyst, and the alkylphenol and formaldehyde are prepared by reacting at a molar ratio of 1:0.1 to 0.2. The effect can be further improved.

In addition, the alkyl group of the alkylphenol novolak resin may further improve the above-described effect by using a C5 to C60 alkyl group.

In addition, the mid-derived husk powder is naturally dried at room temperature and then completely dried by using an oven, and the dried mud husk is pulverized using a conventional grinder, preferably pin milling, to further improve the above-described effect. Can. More specifically, the above-mentioned effect can be further improved by using the meander shell powder having an average particle diameter of 100 to 300 μm.

The latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to one preferred embodiment of the present invention is a quick-mixing cement binder 10 to 30 wt%, fine aggregate 30 to 60 wt%, and coarse aggregate 20 to 50 wt% After stirring in, it may be prepared by further mixing 1 to 20% by weight of the latex modified admixture and 1 to 20% by weight of the compounding water and stirring for a predetermined time (for example, 1 to 10 minutes).

On the other hand, another embodiment of the present invention is a road pavement repairing method using the latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability, cutting the road surface using a crusher, a planing machine, a shot blaster, a water jet, etc. Blasting to remove raytans, impurities and deterioration sites; 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 a latex-modified fast-hardening concrete composition excellent in salt penetration resistance and durability of the present invention on the upper part of the blooming or primer treatment; Post-pouring, to cause cracking and sliding to increase the resistance; Road pavement repairing method using a latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability, including a step of spraying a curing agent and a step of curing to prevent initial plastic cracking by preventing evaporation of moisture at the top after the tining step Gives

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, cover the vinyl or curing cloth on the top, and 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 heat by using a vinyl, curing cloth, or heat insulating cover.

In particular, in the curing step, in the case of atmospheric conditions with high atmospheric temperature (25°C or higher), low relative humidity, and windy atmospheric conditions (for example, during the summer season), after spraying the curing agent, vinyl, curing cloth, etc. Cover and sprinkle to maintain the wet condition.On the contrary, in the case of atmospheric conditions where the atmospheric temperature (less than 25℃) is not high, and the relative humidity is high and the wind is low, only the curing agent is sprayed or cured according to the curing agent.) 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.

In the following, the blooming or primer treatment is used to mean that the latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to an embodiment of the present invention is easily attached to a concrete slab. As the blooming material, at least one selected from SBR (Styrene Butadiene Rubber) latex, poly acryl ester (PAE), epoxy emulsion, ethyl vinyl acetate (EVA), and acrylic emulsion can be used. have. 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 latex-modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to an embodiment of the present invention includes a fast-hardening cement binder and a latex-modifying admixture to promote initial hydration of cement and densification of tissues to make dense concrete. It is possible to secure the initial strength after application, thereby greatly improving the curing speed of mortar, thereby minimizing traffic control time.

In addition, the salt penetration resistance is significantly improved, so that the effect of maintenance can be maintained for a long time. In addition, there is an excellent effect of chemical resistance, water resistance and freeze-thaw resistance. In addition, the adhesion performance with the existing bridge packaging is excellent, and the mechanical properties such as flexural strength, tensile strength and compressive strength are very strengthened, thereby preventing the surface cracking and expansion and destruction of concrete.

Thus, the concrete pavement repairing method using a latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to an embodiment of the present invention improves the mechanical properties of concrete, neutralizes it, and suppresses corrosion of concrete by chloride, By improving the freeze-thaw resistance according to the temperature change, there is an effect that can extend the overall durability and life cycle of the concrete.

As described above, the preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, 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 1>

Preparation of high performance synthetic latex

To the reactor, an emulsifier composition comprising 0.7% by weight sodium dodecylbenzene sulfonate, 0.3% by weight sodium dodecane sulfonate and 0.3% by weight avitic acid was introduced.

After the temperature of the reactor was raised to about 80°C, 39% by weight of styrene, 36% by weight of butyl-prop-2-enoate, 7% by weight of 2-propenamide-co-prop-2-enoic acid, poly The reaction was initiated by adding 8% by weight of vinylamine and 8.5% by weight of 2,2-dinitropropyl acrylate, and 0.06% by weight of potassium persulfate.

Five hours after the reaction was started, 0.07% by weight of tertiary-butyl hydroperoxide and 0.07% by weight of potassium persulfate were added to react for 4 hours, and then stabilized for about 1 hour. By completion of the reaction in time, a high-performance synthetic latex was prepared.

<Production Example 2>

Preparation of alginate-aluminate beads carrying polyketone and collagen

First, an aqueous solution in which 18% by weight of polyketone and 15% by weight of collagen was dispersed in the remaining amount of water was prepared.

Thereafter, after mixing a 1.5% by weight sodium (Na) alginate aqueous solution and a 0.8% by weight sodium (Na) aluminate aqueous solution in a 100:100 volume ratio, 75 parts by volume of the prepared polyketone and collagen dispersion solution Was mixed to form a complex aqueous solution.

The composite aqueous solution was added dropwise to a 2.0 M aqueous calcium chloride solution to synthesize alginate-aluminate beads carrying polyketone and collagen, and washing and drying the alginate-aluminate beads carrying the synthesized polyketone and collagen, Alginate-aluminate beads carrying polyketone and collagen were prepared.

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

The quick-hardening cement binder, fine aggregate, and coarse aggregate mixed with the ingredients and contents as shown in Table 2 were added to the forced mixing mixer, mixed for 3 minutes under dry mixing conditions, and the ingredients as shown in Table 2 below, and The mixed water mixed with the content and the latex modified admixture were simultaneously added and mixed for 1 minute and 30 seconds to prepare a latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability and a comparative concrete composition.

On the other hand, in Comparative Example 3, a styrene-butadiene copolymer synthetic latex described in Korean Registered Patent Publication No. 4441055 was used as a control instead of the high performance synthetic latex of the present invention.

(weight%) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Fast-curing cement binder
(weight%) 25 17 19 25 17 17 Jogang Portland Cement
(Powder degree: 6,300㎠/g) 21 22 23 21 22 22 Metakaolin 22 28 26 22 7 28 Blast furnace slag powder
(Powder degree: 11,000 ㎠/g) 16 18 14 16 22 18 Calcium sulfoaluminate
(Powder degree: 5,500㎠/g) 17 16 17 17 25 16 gypsum 11 7 8 11 13 7 Fly ash
(Circulating fluidized bed boiler using Petrocox) 6 5 6 6 8 5 Desulfurized gypsum
(Circulating fluidized bed boiler using Petrocox) 5 3 4 5 3 3 Glass fine powder (average particle size: 3.8 um) 2 One 2 2 0 One Fast Hard Cement Binder_Total 100 100 100 100 100 100 Latex modified admixture
(Parts by weight) 7 4 8 7 4 4 High performance synthetic latex
[Production Example 1] 100 100 100 100 100 0 Polysilsesquioxane
Copolymer 22 28 24 0 0 0 Aqueous sodium silicate solution 9 11 7 0 0 0 Polyketone and alginate-aluminate beads carrying collagen [Production Example 2] 7 10 8 7 0 0 Alkylphenol novolac resin 0 0 3 0 100 0 Floating paraffin 0 0 0.5 0 0 0 Meander duck skin powder 0 0 2 0 0 0 Styrene-butadiene copolymer synthetic latex [Korea Registered Patent Publication No. 4441055] 0 0 0 0 0 100 Fine aggregate 37 43 41 37 43 43 Coarse aggregate 25 32 28 25 32 32 Blended water 6 4 4 6 4 4 100 100 100 100 100 100

<Test Example>

Latex modified quick-concrete concrete composition having excellent salt permeation resistance and durability according to Examples 1 to 3 of the present invention, so that the characteristics of the latex modified quick-hard concrete composition excellent in salt penetration resistance and durability according to the present invention can be more specifically understood The properties of the comparative concrete composition according to Comparative Examples 1 to 3 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 Comparative Example 3 Dry shrinkage (length change rate (%)) KS F 2424 0.03 0.01 0.01 0.06 0.07 0.07 Compressive strength (MPa)_4 hours KS F 2405 31.9 33.1 36.8 24.8 23.1 24.5 Compressive strength (MPa)_28 days KS F 2405 45.3 46.8 47.9 41.7 39.5 41.3 Flexural strength (MPa)_4 hours KS F 2405 5.33 5.72 5.94 4.7 4.5 4.61 Flexural strength (MPa)_28 days KS F 2405 6.89 7.09 7.34 6.5 6.2 6.4 Bond strength (MPa)_4 hours KS F 2762 2.14 2.21 2.3 1.94 1.89 1.92 Adhesion strength (MPa)_28 days KS F 2762 2.46 2.51 2.55 2.28 2.15 2.2 Coefficient of thermal expansion AASHITO TP 60 4.8x10 ^-6 4.85x10 ^-6 4.86x10 ^-6 4.9x10 ^-6 4.93x10 ^-5 4.92x10 ^-6 Modulus of elasticity KS F 2438 2.46x10 ⁴ 2.48x10 ⁴ 2.49x10 ⁴ 2.41x10 ⁴ 2.39x10 ⁴ 2.4x10 ⁴ Salt penetration resistance (coulomb) KS F 2711 365 385 207 512 660 650 Freeze-thaw resistance (%) KS F 2456 87 94 95 84 81 83 Abrasion resistance (mm) ASTM C 779B 0.67 0.49 0.48 0.78 0.82 0.91 Crack resistance ASTM C 1581 No crack No crack No crack No crack Microcracks Microcracks

As can be seen in Table 3, the latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to Examples 1 to 3, compared with the concrete composition according to Comparative Examples 1 to 3, has a rate of change in length due to drying shrinkage. It was confirmed that this was small.

In addition, the latex modified quick-hardening concrete composition having excellent salt penetration resistance and durability according to Examples 1 to 3 has excellent compressive strength, flexural strength and adhesion strength compared to the concrete compositions according to Comparative Examples 1 to 3; The thermal expansion coefficient is remarkably small, and the elastic coefficient is excellent; It was confirmed that it had excellent salt penetration resistance, freeze-thaw resistance, abrasion resistance and crack 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: Alginate-aluminate beads carrying polyketone and collagen
10: polyketone 20: collagen

Claims (5)

Rapid penetration cement binder 10 to 30% by weight, fine aggregate 30 to 60% by weight, coarse aggregate 20 to 50% by weight, 1 to 20% by weight of latex modified admixture and 1 to 20% by weight salt penetration resistance and durability An excellent latex modified fast-hardening concrete composition;
The quick-setting cement binder
20 to 50% by weight of crude steel Portland cement, 20 to 30% by weight of metakaolin, 15 to 20% by weight of fine powder of blast furnace slag with 6,000 to 12,000 cm 2 /g, and calcium sulfoaluminate with powder of 4,500 to 8,000 cm 2 /g 5 to 30% by weight, 5 to 15% by weight of gypsum, 1 to 10% by weight of fly ash generated in a circulating fluidized bed boiler using petro coke, 1 to 10% by weight of desulfurized gypsum generated from a circulating fluidized bed boiler using petro coke, and average particle size 0.1 to 5 µm containing 0.1 to 5% by weight of the fine glass powder;
The latex modified admixture
Styrene 30 to 40% by weight, Butyl-prop-2-enoate 30 to 40% by weight, 2-propenamide-co-prop-2-enoic acid 1 to 10% by weight, polyvinylamine 1 to 10% by weight And 2,2-dinitropropyl acrylate 1 to 10% by weight of a high-performance synthetic latex comprising 100% by weight of the copolymer of polypropyl silsesquioxane and polymethylsilsesquioxane 20 to 30 parts by weight of sodium silicate aqueous solution 5 to 15 parts by weight of polyketone and collagen-containing alginate-aluminate beads 5 to 15 parts by weight of salt permeation resistance and excellent latex modified quick-drying concrete composition excellent in durability.
According to claim 1,
The latex modified admixture
Alkyl phenol novolac resin 1 to 10 parts by weight, liquid paraffin 0.1 to 1 part by weight, and the salt-peel powder 0.5 to 5 parts by weight further characterized in that the salt penetration resistance and durability excellent latex modified quick-drying concrete composition.
According to claim 1,
The high-performance synthetic latex
Introducing an emulsifier composition comprising 0.5 to 1% by weight of sodium dodecylbenzene sulfonate, 0.1 to 0.3% by weight of sodium dodecane sulfonate and 0.1 to 0.3% by weight of acetic acid into the reactor;
After raising the temperature of the reactor to 75 to 85°C, styrene 30 to 40% by weight, butyl-prop-2-enoate 30 to 40% by weight, 2-propenamide-co-prop-2-enoic acid 1 to 10% by weight, 1 to 10% by weight of polyvinylamine and 1 to 10% by weight of 2,2-dinitropropyl acrylate were added, and 0.05 to 0.1% by weight of potassium persulfate was additionally added. Initiating a reaction; And
4 to 5 hours after the reaction was started, 0.05 to 0.1% by weight of tertiary-butyl hydro peroxide and 0.05 to 0.1% by weight of potassium persulfate were added to terminate the reaction. Latex-modified fast-hardening concrete composition excellent in salt penetration resistance and durability, characterized in that produced by a manufacturing method comprising a.
According to claim 1,
The alginate-aluminate beads carrying the polyketone and collagen
Preparing a complex aqueous solution by mixing a sodium (Na) alginate aqueous solution and a sodium (Na) aluminate aqueous solution, and then mixing a polyketone and collagen dispersion aqueous solution;
Synthesizing alginate-aluminate beads carrying polyketone and collagen by dropwise adding the composite aqueous solution to an aqueous calcium chloride solution; And
A latex modified quick-drying concrete composition having excellent salt penetration resistance and durability, characterized by being prepared by a manufacturing method comprising washing and drying the alginate-aluminate beads carrying the synthesized polyketone and collagen.
As a road pavement repairing method using a latex modified quick-hardening concrete composition excellent in salt penetration resistance and durability according to any one of claims 1 to 4,
Cutting and blasting the road surface using a crusher, a planing machine, a shot blaster or a water jet to remove raytans, impurities and deterioration sites; 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 a latex-modified fast-hardening concrete composition excellent in salt penetration resistance and durability of the present invention on the upper part of the blooming or primer treatment; Post-pouring, to cause cracking and sliding to increase the resistance; Using a latex modified quick-drying concrete composition with excellent salt penetration resistance and durability, comprising a step of spraying a curing agent and a step of curing to prevent initial plastic cracking by preventing evaporation of moisture at the top after the tining step. Road pavement repair method.

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