KR102052916B1 - Concrete composition having reduction of autogenous shrinkage and improved adhesiveness and repairing method for concrete pavement using the same - Google Patents

Abstract

The present invention relates to a concrete composition with improved autogenous shrinkage reduction and adhesiveness and a repairing method for concrete pavement using the same, wherein the concrete composition comprises a cement binder, fine aggregate, coarse aggregate, a functional polymer for mixing concrete, and mixed water. The cement binder is an ultra-rapid hardening cement binder or a high early-strength cement binder; and the functional polymer for mixing concrete is made of a double structure in which 2-ethylhexyl prop-2-enoate and 2-methyl prop-2-enoic acid are further copolymerized to the surface of polymer particles where ethenylbenzene and ethyl prop-2-enoate are polymerized to be branched, such that the center of the polymer particles is maintained in a hard state to enhance heat resistance and the surface of the polymer particles is maintained in a soft state, thereby improving autogenous shrinkage reduction and adhesiveness. Accordingly, shrinkage and expansion due to a change in external temperature are reduced, and adhesiveness is improved, thereby providing a concrete structure and a packaging body with excellent resistance to cracks.

Description

Concrete composition having reduction of autogenous shrinkage and improved adhesiveness and repairing method for concrete pavement using the same}

The present invention relates to a concrete composition with improved self-shrinkage reduction and adhesion strength, and a concrete pavement repair method using the same.

In general, concrete pavement is applied to highways and national roads due to its advantages such as durability and low maintenance cost compared to asphalt pavement. However, the concrete pavement was cracked or partially destroyed due to repeated shrinkage and relaxation due to climate change, neutralization of concrete surface and interior by winter chloride spraying, and cumulative fatigue damage due to increased traffic volume.

In particular, fast cement cement structures and pavements are contracted and expanded more than the design amount in accordance with the change in external temperature when exposed to prolonged periods of ultra high temperature or ultra low temperature. Because of this, in severe cases, the stress of excessively varying lengths is generated, resulting in cracks due to ridges, settlements, or torsions between the concrete dividers, which causes serious damage and durability of structures and packages. In particular, the expansion of concrete caused by heat waves for a long period of time is applied to the cutting line and the stress exceeding the cutting width installed to prevent this, the collision caused by expansion between concrete structures and this result in one ridge and the other settlement Done.

In order to compensate for this problem, the Republic of Korea Patent No. 10-0421255 describes a technique using a latex-modified concrete added SBR (styrene-butadiene rubber) latex to the concrete repair and reinforcement work. However, the technology is that SBR latex is specified only for the bridge packaging of new bridges, and the latex is specialized for general port cement (one type cement), so that the cement composition is different in fast-hardening or coarse cement. The application was unreasonable in use, and the performance was also limited in maintaining the required adhesion strength between deteriorated or neutralized gas concrete and repaired latex modified concrete.

In addition, when SBR latex is used to produce modified fast-hardening and coarse concrete according to the above description, there is a problem in that the surface delamination phenomenon of the concrete occurs severely when the temperature rises in the following year due to the poor freeze-thawing stability in winter. .

Republic of Korea Patent No. 10-0421255 Republic of Korea Patent No. 10-1498502

The present invention was created in view of the above-mentioned problems in the prior art as described above, an embodiment of the present invention reduces the shrinkage and expansion of the concrete structure and pavement according to the external temperature change, excellent compressive strength It is an object of the present invention to provide a concrete composition having improved self-shrinkage reduction and adhesion strength having an adhesive strength.

In addition, another embodiment of the present invention is to provide a concrete pavement repair method using a concrete composition with improved self-shrinkage reduction and adhesion strength according to an embodiment of the present invention.

One embodiment of the present invention includes 10 to 30% by weight cement binder, 30 to 60% by weight fine aggregate, 20 to 50% by weight coarse aggregate, 1 to 20% by weight of functional polymer for mixing concrete and 1 to 20% by weight In the concrete composition to improve the self-shrinkage reduction and adhesion strength; The cement binder is cemented carbide cement or cemented cement cement, the cemented cement cement is 20 to 70 parts by weight of one kind of fly ash cement, 10 to 50 parts by weight of calcium sulfoaluminate, 10 to 50 parts by weight of alumina cement, gypsum 1 to 20 parts by weight and 0.1 to 20 parts by weight of hard calcium carbonate, wherein the crude cement binder is 20 to 30 parts by weight of Portland cement, 10 to 20 parts by weight of one fly ash cement, and 10 to 50 parts by weight of calcium sulfoaluminate Parts, including 10 to 50 parts by weight of alumina cement, 1 to 20 parts by weight of gypsum and 0.1 to 20 parts by weight of hard calcium carbonate; The functional polymer for concrete admixture is based on the total amount of the functional polymer for concrete admixture, 10 to 20 parts by weight of ethenylbenzene and 20 to 40 parts by weight of ethyl prop-2-enoate. To the surface of polymerized addition polymer particles; 40 to 60 parts by weight of 2-ethylhexyl prop-2-enoate and 2-methyl prop-2-enoic acid 1 to By further copolymerizing 5 parts by weight of the branch, the center of the polymer particles is strengthened heat resistance while maintaining a hard (hard), and the surface of the polymer particles is composed of a dual structure to maintain a soft (soft) reducing shrinkage And it provides a concrete composition with improved adhesion strength.

The functional polymer for concrete mixing further includes a polymer porous fiber in the center of the polymer particles to further enhance strength and heat resistance, the polymer porous fiber has an average diameter of 0.01 to 70 nm, and porosity of 50 to 90 volumes. %; Based on the total amount of the functional polymer for concrete admixture, it may be further included in 5 to 10 parts by weight.

In addition, the polymer porous fiber is one containing at least one selected from the group consisting of polyacrylonitrile, metaaramid, polyethersulfone, polyimide, polyvinylidene fluoride, polyamide and mixtures thereof; It is possible to use those whose surface has been modified with aminopropyl-terminus.

In the functional polymer for concrete mixing, a primary emulsifier composition including 0.05 to 0.15 parts by weight of sodium dodecane sulfonate and 0.05 to 0.15 parts by weight of sodium tetradecyl sulfonate is added to the reactor based on the total amount of the functional polymer for concrete mixing. Making; After raising the temperature of the reactor to 75 to 85 ℃, based on the total amount of the functional polymer for concrete mixing, 5 to 10 parts by weight of the polymer porous fiber, 10 to 20 parts by weight of ethenylbenzene and ethylprop- Adding 20 to 40 parts by weight of 2-enoate and further adding 0.01 to 0.05 parts by weight of sodium persulfate to initiate a reaction; 4 to 5 hours after the start of the reaction, adding a secondary emulsifier composition including 0.05 to 0.15 parts by weight of sodium dodecyl sulfonate based on the total amount of the functional polymer for concrete admixture into the reactor; And 40 to 60 weight of 2-ethylhexyl prop-2-enoate based on the total amount of functional polymer for concrete mixing while maintaining the temperature of the reactor at 75 to 85 ° C. Part and 1 to 5 parts by weight of 2-methyl prop-2-enoic acid, and additionally 0.01 to 0.05 parts by weight of sodium persulfate to react for 4 to 5 hours. After that, the step of terminating the reaction; may be prepared by a manufacturing method comprising a.

Another embodiment of the present invention comprises the steps of checking the deterioration area and the degree of degradation of the packaging layer; Removing the deterioration site or the damage site to expose a healthy part; Cleaning the cutting surface to which the healthy part is exposed; Repairing by applying a concrete composition having improved self-shrinkage reduction and adhesion strength on the cutting surface according to the embodiment of the present invention; Finishing the surface of the repaired concrete without hardening; Finishing a rough surface of the repaired concrete pavement; And spraying a curing material to form a film on the repaired concrete surface.

Concrete composition with improved self-shrinkage reduction and adhesion strength according to an embodiment of the present invention comprises a cement binder comprising a low heat fly ash cement; Excellent heat resistance, compressive strength and adhesion strength, including the functional polymer for concrete admixture, which consists of a dual structure in which the center of the polymer particles maintains hard and enhances heat resistance, and the surface of the polymer particles is soft. Has the effect of having. As a result, the concrete pavement repair method using the concrete composition with improved self-shrinkage and adhesion strength according to an embodiment of the present invention is reduced shrinkage and expansion according to the change in the external temperature, the adhesion strength is improved, for cracks There is an effect that can provide a concrete structure and pavement with excellent resistance.

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

One embodiment of the present invention includes 10 to 30% by weight cement binder, 30 to 60% by weight fine aggregate, 20 to 50% by weight coarse aggregate, 1 to 20% by weight of functional polymer for mixing concrete and 1 to 20% by weight In the concrete composition to improve the self-shrinkage reduction and adhesion strength; The cement binder is cemented carbide cement or cemented cement cement, the cemented cement cement is 20 to 70 parts by weight of one kind of fly ash cement, 10 to 50 parts by weight of calcium sulfoaluminate, 10 to 50 parts by weight of alumina cement, gypsum 1 to 20 parts by weight and 0.1 to 20 parts by weight of hard calcium carbonate, wherein the crude cement binder is 20 to 30 parts by weight of Portland cement, 10 to 20 parts by weight of one fly ash cement, and 10 to 50 parts by weight of calcium sulfoaluminate Parts, including 10 to 50 parts by weight of alumina cement, 1 to 20 parts by weight of gypsum and 0.1 to 20 parts by weight of hard calcium carbonate; The functional polymer for concrete admixture is based on the total amount of the functional polymer for concrete admixture, 10 to 20 parts by weight of ethenylbenzene and 20 to 40 parts by weight of ethyl prop-2-enoate. To the surface of polymerized addition polymer particles; 40 to 60 parts by weight of 2-ethylhexyl prop-2-enoate and 2-methyl prop-2-enoic acid 1 to By further copolymerizing 5 parts by weight of the branch, the center of the polymer particles is strengthened heat resistance while maintaining a hard (hard), and the surface of the polymer particles is composed of a dual structure to maintain a soft (soft) reducing shrinkage And it provides a concrete composition with improved adhesion strength.

Concrete composition with improved self-shrinkage reduction and adhesion strength according to an embodiment of the present invention 10 to 30% by weight cement binder, 30 to 60% by weight fine aggregate, 20 to 50% by weight coarse aggregate, functional polymer for concrete mixing 1 to 20 wt% and 1-20 wt% of blended water.

At this time, the fine aggregate is used to have a particle size of 5 mm or less so as to meet the reference value according to the concrete standard specifications, considering the flatness of the concrete surface and the strength of the concrete, it is preferably included in the above content range.

In addition, the coarse aggregate is used to have a particle size of 19 mm or less so as to meet the reference value according to the concrete standard specifications, considering the strength, miscibility and flatness of the concrete, it is preferably included in the above content range.

In addition, the cement binder may be a cemented carbide cement binder or a cemented cement binder.

In this case, the cemented carbide cement binder is 20 to 70 parts by weight of one kind of fly ash cement, 10 to 50 parts by weight of calcium sulfoaluminate, 10 to 50 parts by weight of alumina cement, 1 to 20 parts by weight of gypsum and 0.1 to 20 parts of hard calcium carbonate. Including the weight part, there is an effect that can implement ultra-high speed, without using the crude steel cement prescribed in KS.

In addition, the crude steel cement binder is 20 to 30 parts by weight of Portland cement, 10 to 20 parts by weight of one kind of fly ash cement, 10 to 50 parts by weight of calcium sulfoaluminate, 10 to 50 parts by weight of alumina cement, 1 to 20 parts by weight of gypsum. And hard calcium carbonate, including 0.1 to 20 parts by weight, there is an effect that can implement excellent crude steel properties without using the crude steel cement prescribed in KS.

The portland cement is a cement that satisfies the KS L 5201 quality standard, and is preferably mixed in 20 to 30 parts by weight of the crude steel cement binder. If the mixing content is too small, the calcium sulfoaluminate cement and the alumina cement content are increased to increase the required amount of compounding rapidly, making it difficult to control the pot life, and the strength of the concrete decreases as the amount of the compounding increases. There is a problem that can be. In addition, if the mixing content is too large, the required amount of compounding is reduced and the dispersibility is improved, but there is a problem that it is difficult to secure the initial strength.

It is preferable to use the one kind of fly ash cement specified within the KS standard range. The first type of fly ash cement has a lower heat of hydration than ordinary portland cement, and has a spherical shape, thereby improving fluidity and improving workability and flowability.

Such a kind of fly ash cement is 20 to 70 parts by weight in the cemented cement cement binder, and 10 to 20 parts by weight in the crude steel cement binder is preferably mixed. If the mixing content is too small, additional compounding water is required in order to obtain a certain level of workability and flowability in which workability is reduced and workability and flowability are reduced, thereby increasing the initial and long-term strength of the concrete. There is a problem that can be degraded and the durability of the concrete structure and pavement can be reduced. In addition, if the mixed content is too high, the initial strength of the cement binder is lowered and the content of the pozzolanic reactant is excessively increased, so that the long-term strength is continuously increased to increase brittleness of the concrete structure and the package. Therefore, the content of the first type fly ash cement is preferably limited to the above range.

In addition, the calcium sulfo-aluminate (calcium sulfo-aluminate) is a compound of 3CaO · 3Al ₂ O ₃ · CaSO, which is hydrated to produce ettringite, which results in the coagulation characteristics, dry shrinkage, water tightness and strength of the cement binder. Has the function to adjust.

Such calcium sulfoaluminate is preferably mixed in a cemented carbide cement binder and a cemented cement cement 10 to 50 parts by weight, respectively. If the mixing content is too small, the dry shrinkage function is reduced, there is a problem that the water tightness is weakened and durability can be reduced. In addition, if the mixed content is too large, the ettringite needle crystal is excessively generated during the hydration reaction, thereby increasing the volume expansion rate, thereby preventing the effect of drying shrinkage control. Therefore, the content of the calcium sulfoaluminate is preferably limited to the above range.

In addition, alumina cement including aluminum oxide (alumina) is added to improve the strength of the concrete as well as to improve the heat resistance. When the amount of the alumina cement is increased, the initial strength and the heat of hydration of the cement binder are increased, so that the cemented carbide cement and the cemented cement cement may be mixed in an amount of 10 to 50 parts by weight. If the mixed content is too small, there is a problem that the initial heat of hydration and strength is lowered to delay the coagulation characteristics and the initial strength may be lowered. In addition, if the mixed content is too much, the initial condensation is faster to obtain available pot life, the initial strength is increased, the brittleness of the concrete structure and the package may be increased. Therefore, the content of the alumina cement is preferably limited to the above range.

In addition, the gypsum is to be used to prevent the cracking of the concrete and to prevent the shrinkage of the concrete by densifying the tissue, anhydrous gypsum or dihydrate gypsum can be used. In particular, anhydrous gypsum is a calcium sulfate salt that does not have crystal water, thereby controlling the initial strength expression and condensation, so that the effect of preventing shrinkage of concrete is very good.

Such gypsum is preferably mixed in 1 to 20 parts by weight of the cemented carbide cement binder and the crude steel cement binder. If the mixed content is too small, there is a problem that the initial setting delay and initial strength of the cement binder and concrete structures and pavement using the same decreases, and the long-term strength may also decrease. In addition, if the mixed content is too large, the curing and curing speed is too fast to ensure available pot life, and workability may also be reduced. Therefore, the content of the gypsum is preferably limited to the above range.

In addition, the hard calcium carbonate is added in order to implement the effect of improving the workability and drying shrinkage low spherical particle shape and low thermal conductivity.

Such hard calcium carbonate is preferably mixed with 0.1 to 20 parts by weight of the cemented carbide cement and the cemented cement cement. If the mixing content is too small, there is a problem that the workability and workability improvement effect is reduced, and the dry shrinkage control effect of the concrete structure and pavement may be inhibited. In addition, if the mixed content is too much, the initial and long-term strength of the cement binder may be lowered and durability may be lowered. Therefore, the content of the hard calcium carbonate is preferably limited to the above range.

The cement binder further comprises 0.1 to 10 parts by weight of oxide powder obtained by mixing zirconia (ZrO 2) and barium aluminate (BaAl 2 O 4) having a cubic crystal phase in a ratio of 1 to 3 by weight, thereby reducing self-shrinkage and adhesion of the present invention. In the concrete composition having improved strength, excellent compatibility with the hard calcium carbonate, and by providing an excellent thermal barrier effect, it is possible to reduce the shrinkage and expansion caused by changes in the external temperature.

Such cement binder is preferably included in the concrete composition 15 to 20% by weight in the self-shrinkage reduction and adhesion strength improved. When the content of the cement binder is too small, there is a high possibility of lack of viscosity and bridging of the unconsolidated concrete, thereby increasing the possibility of plastic cracking. In addition, the water resistance may be reduced due to the decrease in strength and water tightness of concrete. In addition, if the mixed content is too much, the viscosity increases, workability is lowered, difficult to control the pot life, the initial strength is lowered and the long-term strength is continuously increased by increasing excessive water tightness to dry shrinkage of concrete structures and pavement Cracking may occur.

On the other hand, in the case of the conventional cement concrete, in order to supplement or improve these disadvantages, because the binder has a defect such as late curing time, small tensile strength, large dry shrinkage, low chemical resistance as cement hydrate, one embodiment of the present invention, Concrete compositions having improved self shrinkage and adhesion strength according to the examples are used by adding a functional polymer for concrete mixing.

The functional polymer for concrete mixing is based on the total amount of the functional polymer for concrete mixing, 10 to 20 parts by weight of ethenylbenzene and 20 to 40 ethyl prop-2-enoate. Parts by weight of polymerized polymer particles; 40 to 60 parts by weight of 2-ethylhexyl prop-2-enoate and 2-methyl prop-2-enoic acid 1 to The above effect can be further improved by using a polymer further copolymerized by branching 5 parts by weight.

As a result, the center of the polymer particles is hardened to maintain heat and strengthen the heat resistance, and the surface of the polymer particles is manufactured to have a dual structure that maintains soft, thereby shrinking at a higher or lower temperature than the polymer of a single structure. In addition, the expansion coefficient can be minimized, and when mixed with concrete, the same effect can be obtained, and the thermal expansion coefficient is significantly smaller than that of general concrete, which greatly reduces dry shrinkage and improves crack resistance. That is, there is an effect of imparting excellent heat resistance, compressive strength and adhesion strength to the concrete composition improved self-shrinkage reduction and adhesion strength according to an embodiment of the present invention. As a result, shrinkage and expansion due to external temperature change are reduced, and adhesion strength is improved, thereby providing a concrete structure and a pavement having excellent resistance to cracking.

The above-mentioned functional polymer for concrete mixing may be included in an amount of 1 to 20% by weight in the concrete composition having improved self-shrinkage resistance and adhesion strength according to one embodiment of the present invention.

More specifically, the functional polymer for concrete mixing is first, by polymerizing 10 to 20 parts by weight of ethenylbenzene and 20 to 40 parts by weight of ethyl prop-2-enoate as monomers. To prepare a polymer core particles that can enhance the strength and heat resistance.

The ethenylbenzene (C ₆ H ₅ CHCH ₂ , molecular weight: 104.14, solubility: 0.031 g / ml @ 25 ℃, Tg: 100 ℃, boiling point: 145 ℃, melting point: -30.6 ℃) is the polymer center polymerized There is an effect that can enhance the rigidity, compressive strength and heat resistance of the particles. Such ethenylbenzene is preferably included in the content of 10 to 20 parts by weight in the functional polymer for concrete mixing. If the content is too small, there is a problem that the compressive strength can be reduced, and if the content is too high, the effect of improving the bending strength and adhesion strength of the concrete structure and the package may be weak.

In addition, the ethyl prop-2-enoate (CH ₂ CHCOOC ₂ H ₅ , molecular weight: 100.11 solubility: 1.5g/100ml@20 ℃, Tg: -24 ℃, boiling point: 100 ℃, melting point: -72 ℃) has the effect of strengthening the ductility, bending strength and tensile strength of the polymerized polymer core particles. Such ethyl prop-2-enoate is preferably included in the content of 20 to 40 parts by weight in the functional polymer for concrete mixing. If the content is too small, there is a problem that the ductility, bending strength and tensile strength of the concrete structure and the package can be reduced, if the content is too high, the ductility is excessively high, the compressive strength and durability of the concrete structure and the package will be lowered Can be.

The functional polymer for concrete mixing may further include a polymer porous fiber in the center of the polymer particles to further enhance strength and heat resistance. That is, ethenylbenzene and ethyl prop-2-enoate may be polymerized together with the polymer porous fiber to further enhance the strength and heat resistance of the polymer core particle. The polymer porous fiber may be further included in an amount of 5 to 10 parts by weight based on the total amount of the functional polymer for concrete mixing in consideration of the above effects.

The polymer porous fiber is an average diameter of 0.01 to 70 nm, the porosity is preferably used that is 50 to 90% by volume. As a result, the above-mentioned monomers can penetrate and polymerize into the pores of the polymer porous fiber, thereby further improving the above effects.

In addition, the polymer porous fibers using at least one selected from the group consisting of polyacrylonitrile, metaaramid, polyethersulfone, polyimide, polyvinylidene fluoride, polyamide and mixtures thereof, The effect of improving heat resistance can be further improved.

In addition, the polymer porous fiber may further improve the reactivity with the above-described monomers by using an aminopropyl-terminated surface modified to further improve the above effects. More specifically, the process of modifying the surface with an aminopropyl-terminus may be performed by dispersing the porous structure in a solvent and then reacting with a compound containing an aminopropyl- group. In this case, the compound containing the aminopropyl- group is preferably used APS (3-aminopropyltriethoxysilane).

Subsequently, 40 to 60 parts by weight of 2-ethylhexyl prop-2-enoate and 2-methyl prop-2-enoic acid (2 -methyl prop-2-enoic acid) 1 to 5 parts by weight may be further copolymerized to be branched, so that the surface of the polymer particles may be made of a dual structure that maintains softness.

2-ethylhexyl prop-2-enoate (CH ₂ CHCOOCH ₂ CH (CH ₂ CH ₃ ) (CH ₂ ) ₃ CH _3, molecular weight: 184.26, solubility: 100mg / L, Tg: -70 ° C, boiling point: 125 ° C, melting point: -90 ° C) has the effect of enhancing ductility, tensile strength and wear resistance on the polymerized polymer particle surface. Such 2-ethylhexyl prop-2-enoate is preferably included in the content of 40 to 60 parts by weight in the functional polymer for concrete mixing. If the content is too small, there is a problem that the required bending strength and adhesion strength may be lowered due to the lack of ductility on the surface of the polymer particles, if the content is too much, the ductility is excessively high, the compressive strength and durability of the concrete structure and pavement This can be degraded.

In addition, the 2-methyl prop-2-enoic acid (CH ₂ C (CH ₃ ) COOCH ₃ ; molecular weight: 86.09, solubility: 89g / L, Tg: -228 ℃, boiling point: 159 ℃, melting point: 16 ° C.) gives rigidity to the polymerized polymer particle surface, thereby securing initial strength. In addition, when mixed with cement containing a large amount of polyvalent heavy metal ions, the surface of the cement particles are ionically neutralized to improve dispersibility, and the dispersion speed is increased to improve local strength nonuniformity. Such 2-methyl prop-2-enoic acid is preferably included in the content of 1 to 5 parts by weight in the functional polymer for concrete mixing. If the content is too small, the storage stability of the polymerized polymer may be inferior, and the dispersibility of the concrete composition according to the embodiment of the present invention may be reduced, which may cause initial strength degradation and uneven strength variation of the composition. And, if the content is too much may be excessively rigid to tend to break the concrete structure and pavement.

A more preferable example of the production of the functional polymer for concrete mixing is a reactor comprising 0.05 to 0.15 parts by weight of sodium dodecane sulfonate and 0.05 to 0.15 part by weight of sodium tetradecyl sulfonate based on the total amount of the functional polymer for concrete mixing. Introducing a primary emulsifier composition; After raising the temperature of the reactor to 75 to 85 ℃, based on the total amount of the functional polymer for concrete mixing, 5 to 10 parts by weight of the polymer porous fiber, 10 to 20 parts by weight of ethenylbenzene and ethylprop- Adding 20 to 40 parts by weight of 2-enoate and further adding 0.01 to 0.05 parts by weight of sodium persulfate to initiate a reaction; 4 to 5 hours after the start of the reaction, adding a secondary emulsifier composition including 0.05 to 0.15 parts by weight of sodium dodecyl sulfonate based on the total amount of the functional polymer for concrete admixture into the reactor; And 40 to 60 weight of 2-ethylhexyl prop-2-enoate based on the total amount of functional polymer for concrete mixing while maintaining the temperature of the reactor at 75 to 85 ° C. Part and 1 to 5 parts by weight of 2-methyl prop-2-enoic acid, and additionally 0.01 to 0.05 parts by weight of sodium persulfate to react for 4 to 5 hours. After that, the step of terminating the reaction; may be prepared by a manufacturing method comprising a.

 The concrete composition having improved self-shrinkability and adhesion strength of the present invention may further comprise 2 to 5% by weight of hyaluronic acid. The hyaluronic acid is one of complex polysaccharides consisting of amino acids and uronic acids, and is a high molecular compound consisting of N-acetylglucosamine and glucuronic acid, and is present in the eye vitreous body or umbilical cord. It may be added to achieve the integration by increasing the adhesion between the powder particles of the crosslinked with the functional polymer for concrete mixing.

Another embodiment of the present invention comprises the steps of checking the deterioration area and the degree of degradation of the packaging layer; Removing the deterioration site or the damage site to expose a healthy part; Cleaning the cutting surface to which the healthy part is exposed; Repairing by applying a concrete composition having improved self-shrinkage reduction and adhesion strength on the cutting surface according to the embodiment of the present invention; Finishing the surface of the repaired concrete without hardening; Finishing a rough surface of the repaired concrete pavement; And spraying a curing material to form a film on the repaired concrete surface.

Concrete composition with improved self-shrinkage reduction and adhesion strength according to an embodiment of the present invention comprises a cement binder comprising a low heat fly ash cement; Excellent heat resistance, compressive strength and adhesion strength, including the functional polymer for concrete admixture, which consists of a dual structure in which the center of the polymer particles maintains hard and enhances heat resistance, and the surface of the polymer particles is soft. Has the effect of having. As a result, the concrete pavement repair method using the concrete composition with improved self-shrinkage and adhesion strength according to an embodiment of the present invention is reduced shrinkage and expansion according to the change in the external temperature, the adhesion strength is improved, for cracks There is an effect that can provide a concrete structure and pavement with excellent resistance.

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

<Manufacture example 1>

Into the reactor, a primary emulsifier composition containing 0.1 part by weight of sodium dodecane sulfonate and 0.1 part by weight of sodium tetradecyl sulfonate was introduced based on the total amount of the functional polymer for concrete mixing. After raising the temperature of the reactor to about 80 ℃, 15 parts by weight of ethenylbenzene and ethyl prop-2-enoate based on the total amount of functional polymer for concrete mixing 25 parts by weight was added, and 0.02 parts by weight of sodium persulfate was further added to initiate the reaction. 5 hours after the start of the reaction, a secondary emulsifier composition containing 0.1 parts by weight of sodium dodecyl sulfonate was added to the reactor based on the total amount of the functional polymer for concrete mixing. 59 parts by weight of 2-ethylhexyl prop-2-enoate and 2- based on the total amount of the functional polymer for concrete admixture while maintaining the temperature of the reactor at about 80 ℃ 1 part by weight of methyl prop-2-enoic acid was added, 0.02 part by weight of sodium persulfate was added thereto, followed by reaction for 4 hours, and the reaction was terminated with stabilization time for about 1 hour. By doing so, a functional polymer for concrete admixture was produced.

<Manufacture example 2>

In Preparation Example 1, after adding the secondary emulsifier composition, 2-ethylhexyl prop-2-enoate based on the total amount of the functional polymer for concrete admixture, while maintaining the temperature of the reactor at about 80 ° C 55 parts by weight of (2-ethylhexyl prop-2-enoate) and 5 parts by weight of 2-methyl prop-2-enoic acid were added, and 0.02 parts by weight of sodium persulfate was further added. After the reaction for 4 hours, a functional polymer for concrete mixing was prepared in the same manner as in Preparation Example 1, except that the reaction was terminated with a stabilization time of about 1 hour.

<Manufacture example 3>

In Preparation Example 1, after the primary emulsifier composition was added, the reactor temperature was raised to about 80 ℃, based on the total amount of the functional polymer for concrete mixing, 5 parts by weight of polyether sulfone polymer porous fiber ( Average diameter: about 11 nm, porosity: about 54% by volume), 15 parts by weight of ethenylbenzene and 20 parts by weight of ethyl prop-2-enoate, and sodium fur A functional polymer for concrete admixture was prepared in the same manner as in Preparation Example 1, except that 0.02 part by weight of sulfate was added to initiate the reaction.

<Manufacture example 4>

In Preparation Example 1, after the primary emulsifier composition was added, the temperature of the reactor was raised to about 80 ° C., and the surface was modified with an aminopropyl-terminator based on the total amount of the functional polymer for concrete mixing. Metaaramid polymer porous fiber 7 parts by weight (average diameter: about 50 nm, porosity: about 88% by volume), 10 parts by weight of ethenylbenzene and ethyl prop-2-enoate ) 23 parts by weight was added, and 0.02 parts by weight of sodium persulfate was added to prepare a functional polymer for concrete admixture in the same manner as in Preparation Example 1, except that the reaction was initiated.

On the other hand, the styrene-butadiene copolymer synthetic latex described in Republic of Korea Patent Publication No. 4,444,55 was used as a control.

The physical properties of Preparation Examples 1, 2, 3, and 4 and the control were confirmed as in the following [Table 1].

At this time, the test criteria of the solid content, pH, surface tension was KSM 6516-2016, the particle size was KSA ISO 13320-2014.

As can be seen in Table 1, the functional polymer for concrete mixing according to Preparation Examples 3 and 4 obtained by the production method of the present invention, compared with the functional polymer for concrete mixing of Preparation Examples 1 and 2, the polymer porous fiber is added As it was confirmed that the content of solids and the particle size increased. In addition, the functional polymer for concrete mixing of Preparation Examples 1 to 4 was confirmed to have a lower surface tension than the control. As a result, it was expected to be mixed with high compatibility in the concrete composition.

<Examples 1 to 4>

15% by weight cemented carbide cement binder, 43% by weight aggregate and 34% by weight coarse aggregate were added to a forced mixing mixer, mixed for 3 minutes under dry mixing conditions, and mixed with each concrete prepared in Production Examples 1 to 4. 4 wt% of the functional polymer and 4 wt% of the blended water were simultaneously added and mixed for 1 minute and 30 seconds to prepare a concrete composition having improved self shrinkage and adhesive strength.

In this case, the cemented carbide cement binder was used by mixing 50 parts by weight of one kind of fly ash cement, 20 parts by weight of calcium sulfoaluminate, 20 parts by weight of alumina cement, 18 parts by weight of gypsum, and 2 parts by weight of hard calcium carbonate. Physical properties of the cemented carbide cements are shown in Table 2 below.

Comparative Example 1

A concrete composition was prepared through the same process as in Example 1, except that the functional polymer for mixing concrete was not mixed.

More specifically, 15% by weight cemented carbide cement binder, 43% by weight aggregate and 34% by weight coarse aggregate were added to a forced mixing mixer, mixed for 3 minutes under dry blending conditions, and 8% by weight of mixed water was added for 1 minute. Mixing for 30 seconds to prepare a concrete composition (based on 160mm of the slump of the cemented cement cement binder, Comparative Example 1 requires an additional blending water), wherein the cemented cement cement binder is the cement binder used in Example 1 Is the same as

Comparative Example 2

In place of the functional polymer for concrete admixtures prepared in Preparation Examples 1 to 4, except that the styrene-butadiene copolymer synthetic latex described in the Republic of Korea Patent Publication No. 4444501 used as a control, the same as in Example 1 Through the process to prepare a concrete composition.

<Test Example>

Characteristics of the concrete composition according to Examples 1 to 4 of the present invention and the concrete composition according to Comparative Examples 1 and 2 so as to more specifically grasp the characteristics of the concrete composition with improved self-shrinkage reduction and adhesion strength according to the present invention Is shown as the experimental results.

<Test Example 1>

For the concrete compositions according to Examples 1 to 4 and the concrete compositions according to Comparative Examples 1 and 2, dry shrinkage was measured according to the method defined in KS F 2424, and the results are shown in Table 3 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Length change rate (%) 0.10 0.06 0.04 0.02 0.21 0.13

As can be seen in Table 3, the concrete composition according to Examples 1 to 4 was confirmed that the length change rate according to the drying shrinkage is less than the concrete composition according to Comparative Example 1 and Comparative Example 2.

<Test Example 2>

For the concrete compositions according to Examples 1 to 4 and the concrete compositions according to Comparative Examples 1 and 2, the coefficient of thermal expansion was measured according to the method specified in AASHTO TP 60, and the results are shown in Table 4 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Coefficient of thermal expansion 6.1x10 ^-6 4.2 x 10 ^-6 4.4 x 10 ^-6 4.2 x 10 ^-6 21.3 x 10 ^-5 11.5 x 10 ^-6

As can be seen in Table 4, the concrete composition according to Examples 1 to 4 was confirmed that the thermal expansion coefficient is significantly smaller than the concrete composition according to Comparative Example 1 and Comparative Example 2.

<Test Example 3>

For the concrete compositions according to Examples 1 to 4 and the concrete compositions according to Comparative Examples 1 and 2, crack resistance was measured according to the method specified in ASTM C 1581, and the results are shown in Table 5 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Crack resistance No crack No crack No crack No crack Microcracks Microcracks

As can be seen in Table 5, it was confirmed that the concrete composition according to Examples 1 to 4 has better crack resistance than the concrete composition according to Comparative Example 1 and Comparative Example 2.

<Test Example 4>

For the concrete compositions according to Examples 1 to 4 and the concrete compositions according to Comparative Examples 1 and 2, chlorine ion permeation resistance was measured according to the method specified in KSF 2711, and the results are shown in Table 6 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 coulomb 445 421 413 423 1908 1220

As can be seen in Table 6, it was confirmed that the concrete composition according to Examples 1 to 4 has better chlorine ion penetration resistance than the concrete composition according to Comparative Example 1 and Comparative Example 2.

<Test Example 5>

For the concrete compositions according to Examples 1 to 4 and the concrete compositions according to Comparative Examples 1 and 2, freeze thaw resistance was measured according to the method specified in KSF 2456, and the results are shown in Table 7 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 % 83 87 88 82 66 77

As can be seen in Table 7, it was confirmed that the concrete compositions according to Examples 1 to 4 had better freeze-thawing resistance than the concrete compositions according to Comparative Examples 1 and 2.

<Test Example 6>

For the concrete composition according to Examples 1 to 4 and the concrete composition according to Comparative Examples 1 and 2, the compressive strength and the adhesive strength were measured according to the methods specified in KSF 2405 and KSF 2762, and the results are shown in Table 8 below. Shown in

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Compressive strength (MPa) 23.5 25.9 25.4 26.7 16.2 19.6 Adhesion Strength (MPa) 1.66 1.73 1.84 1.44 0.51 1.22

As can be seen in Table 8, the concrete composition according to Examples 1 to 4 was confirmed to have a superior compressive strength and adhesion strength than the concrete composition according to Comparative Example 1 and Comparative Example 2.

<Examples 5 to 8>

15% by weight of the crude cement binder, 43% by weight of the aggregate and 34% by weight of the coarse aggregate were added to the forced mixing mixer, mixed for 3 minutes under dry mixing conditions, and the functionalities for mixing each concrete prepared in Preparation Examples 1-4. 4% by weight of the polymer and 4% by weight of the blended water were simultaneously added and mixed for 1 minute and 30 seconds to prepare a concrete composition having improved self-shrinkage reduction and adhesion strength.

At this time, the crude cement binder is used by mixing 26 parts by weight of Portland cement, 17 parts by weight of one fly ash cement, 12 parts by weight of calcium sulfoaluminate, 24 parts by weight of alumina cement, 17 parts by weight of gypsum and 4 parts by weight of hard calcium carbonate. It was. Physical properties of the crude cement binder are shown in Table 9 below.

Comparative Example 3

A concrete composition was prepared in the same manner as in Example 5, except that the functional polymer for mixing concrete was not mixed.

More specifically, 15% by weight of cement binder, 43% by weight of aggregate and 34% by weight of coarse aggregate were added to a forced mixing mixer, mixed for 3 minutes under dry blending conditions, and 8% by weight of mixed water was added for 1 minute 30 seconds. The concrete composition was prepared by mixing (based on 160 mm of slump of the crude steel cement binder, Comparative Example 1 requires an additional compounding water). At this time, the crude steel cement binder is the same as the crude cement cement binder used in Example 5. .

<Comparative Example 4>

In place of the functional polymer for concrete admixtures prepared in Preparation Examples 1 to 4, except that the styrene-butadiene copolymer synthetic latex described in the Republic of Korea Patent Publication No. 4444501 used as a control, the same as in Example 5 Through the process to prepare a concrete composition.

<Test Example>

Characteristics of the concrete composition according to Examples 5 to 8 of the present invention and the concrete composition according to Comparative Examples 3 and 4 so as to more specifically understand the characteristics of the concrete composition with improved self-shrinkage reduction and adhesion strength according to the present invention Is shown as the experimental results.

<Test Example 7>

For the concrete composition according to Examples 5 to 8 and the concrete composition according to Comparative Example 3 and Comparative Example 4, the dry shrinkage was measured according to the method specified in KS F 2424, the results are shown in Table 10 below.

division Example 5 Example 6 Example 7 Example 8 Comparative Example 3 Comparative Example 4 Length change rate (%) 0.13 0.09 0.08 0.06 0.21 0.17

As can be seen in Table 10, the concrete composition according to Examples 5 to 8 was confirmed that the length change rate according to the drying shrinkage is less than the concrete composition according to Comparative Example 3 and Comparative Example 4.

<Test Example 8>

For the concrete compositions according to Examples 5 to 8 and the concrete compositions according to Comparative Examples 3 and 4, the coefficient of thermal expansion was measured according to the method defined in AASHTO TP 60, and the results are shown in Table 11 below.

division Example 5 Example 6 Example 7 Example 8 Comparative Example 3 Comparative Example 4 Coefficient of thermal expansion 5.3x10 ^-6 4.8 x 10 ^-6 4.2 x 10 ^-6 4.1 x 10 ^-6 18.8 x 10 ^-5 16.2 x 10 ^-6

As can be seen in Table 11, the concrete composition according to Examples 5 to 8 was confirmed that the coefficient of thermal expansion is significantly smaller than the concrete composition according to Comparative Example 3 and Comparative Example 4.

<Test Example 9>

For the concrete composition according to Examples 5 to 8 and the concrete composition according to Comparative Example 3 and Comparative Example 4, the crack resistance was measured according to the method specified in ASTM C 1581, the results are shown in Table 12 below.

division Example 5 Example 6 Example 7 Example 8 Comparative Example 3 Comparative Example 4 Crack resistance No crack No crack No crack No crack Microcracks Microcracks

As can be seen in Table 12, it was confirmed that the concrete composition according to Examples 5 to 8 has better crack resistance than the concrete composition according to Comparative Example 3 and Comparative Example 4.

<Test Example 10>

For the concrete compositions according to Examples 5 to 8 and the concrete compositions according to Comparative Examples 3 and 4, chlorine ion permeation resistance was measured according to the method specified in KSF 2711, and the results are shown in Table 13 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 coulomb 883 880 753 733 2031 1552

As can be seen in Table 13, it was confirmed that the concrete composition according to Examples 5 to 8 has better chlorine ion penetration resistance than the concrete composition according to Comparative Example 3 and Comparative Example 4.

<Test Example 11>

About the concrete composition according to Examples 5 to 8 and the concrete composition according to Comparative Example 3 and Comparative Example 4, freeze thaw resistance was measured according to the method specified in KSF 2456, and the results are shown in Table 14 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 % 85 86 86 84 62 75

As can be seen in Table 14, the concrete composition according to Examples 5 to 8 was confirmed to have a better freeze thaw resistance than the concrete composition according to Comparative Example 3 and Comparative Example 4.

<Test Example 12>

For the concrete compositions according to Examples 5 to 8 and the concrete compositions according to Comparative Examples 3 and 4, the compressive strength and the adhesion strength were measured according to the methods specified in KSF 2405 and KSF 2762, and the results are shown in Table 15 below. Shown in

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Compressive strength (MPa) 28.5 28.4 28.5 30.5 17.8 23.6 Adhesion Strength (MPa) 1.77 1.79 1.80 1.60 0.63 1.30

As can be seen in Table 15, the concrete composition according to Examples 5 to 8 was confirmed to have a superior compressive strength and adhesion strength than the concrete composition according to Comparative Example 3 and Comparative Example 4.

This means that the concrete composition according to Examples 1 to 8 of the present invention comprises a cement binder comprising a low heat fly ash cement; The center of the polymer particles strengthens heat resistance while maintaining hard, and the surface of the polymer particles includes a functional polymer for concrete admixture having a dual structure that maintains soft, thereby providing excellent heat resistance, compressive strength and adhesion strength. It is believed to have had.

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

Claims (5)

Self shrinkage reduction and adhesion comprising 10 to 30% by weight cement binder, 30 to 60% by weight fine aggregate, 20 to 50% by weight coarse aggregate, 1 to 20% by weight functional polymer for concrete mixing and 1 to 20% by weight In concrete compositions with improved strength;
The cement binder is cemented carbide cement cement or cemented steel cement binder,
The cemented carbide cement binder is 20 to 70 parts by weight of one kind of fly ash cement, 10 to 50 parts by weight of calcium sulfoaluminate, 10 to 50 parts by weight of alumina cement, 1 to 20 parts by weight of gypsum and 0.1 to 20 parts by weight of hard calcium carbonate. I include it,
The crude cement binder is 20 to 30 parts by weight of Portland cement, 10 to 20 parts by weight of one kind of fly ash cement, 10 to 50 parts by weight of calcium sulfoaluminate, 10 to 50 parts by weight of alumina cement, 1 to 20 parts by weight of gypsum and hard It comprises 0.1 to 20 parts by weight of calcium carbonate;
The functional polymer for concrete admixture is based on the total amount of the functional polymer for concrete admixture, 10 to 20 parts by weight of ethenylbenzene and 20 to 40 parts by weight of ethyl prop-2-enoate. To the surface of polymerized addition polymer particles; 40 to 60 parts by weight of 2-ethylhexyl prop-2-enoate and 2-methyl prop-2-enoic acid 1 to By further copolymerizing 5 parts by weight to branch, the center of the polymer particles is strengthened heat resistance while maintaining a hard, and the surface of the polymer particles is of a dual structure to keep soft;
The functional polymer for concrete mixing further includes a polymer porous fiber in the center of the polymer particles to further enhance strength and heat resistance, the polymer porous fiber has an average diameter of 0.01 to 70 nm, and porosity of 50 to 90 volumes. %, And based on the total amount of the functional polymer for concrete mixing, 5 to 10 parts by weight of the concrete composition, characterized in that it further comprises self-shrinkage reduction and adhesion strength.
delete The method of claim 1,
The polymeric porous fiber comprises one or more selected from the group consisting of polyacrylonitrile, metaaramid, polyethersulfone, polyimide, polyvinylidene fluoride, polyamide and mixtures thereof;
A concrete composition with improved self-shrinkage reduction and adhesion strength, wherein the surface is modified with an aminopropyl-terminus.
The method of claim 1,
The functional polymer for concrete mixing
Introducing a primary emulsifier composition comprising 0.05 to 0.15 parts by weight of sodium dodecane sulfonate and 0.05 to 0.15 parts by weight of sodium tetradecyl sulfonate, based on the total amount of the functional polymer for concrete mixing;
After raising the temperature of the reactor to 75 to 85 ℃, based on the total amount of the functional polymer for concrete mixing, 5 to 10 parts by weight of the polymer porous fiber, 10 to 20 parts by weight of ethenylbenzene and ethylprop- Adding 20 to 40 parts by weight of 2-enoate and further adding 0.01 to 0.05 parts by weight of sodium persulfate to initiate a reaction;
4 to 5 hours after the start of the reaction, adding a secondary emulsifier composition including 0.05 to 0.15 parts by weight of sodium dodecyl sulfonate based on the total amount of the functional polymer for concrete admixture into the reactor; And
40 to 60 parts by weight of 2-ethylhexyl prop-2-enoate based on the total amount of the functional polymer for concrete mixing while maintaining the temperature of the reactor at 75 to 85 ° C. 1 to 5 parts by weight of 2-methyl prop-2-enoic acid, and additionally 0.01 to 0.05 parts by weight of sodium persulfate to react for 4 to 5 hours. The concrete composition, characterized in that the self-shrinkage reduction and adhesion strength improved by the manufacturing method comprising the step of terminating the reaction.
Checking the deterioration area and the deterioration degree of the pavement layer;
Removing the deterioration site or the damage site to expose a healthy part;
Cleaning the cutting surface to which the healthy part is exposed;
Repairing by applying a concrete composition having improved self-shrinkage reduction and adhesion strength according to any one of claims 1 and 3 to 4 on the cutting surface;
Finishing the surface of the repaired concrete without hardening;
Finishing a rough surface of the repaired concrete pavement; And
Spraying the curing material to form a film on the repaired concrete surface; concrete pavement repair method comprising a.