KR102135004B1 - Heat reduction type quick-hardening cement concrete composition comprising functional binder containing and repairing method for road pavement therewith - Google Patents

Abstract

The present invention relates to a hydration heat reduction type ultra-rapid hardening cement concrete composition containing a functional binder and a road pavement repair method using the same. The present invention can improve the workability and constructability of concrete by using a binder, improve the toughness and adhesion strength of the concrete, reduce shrinkage to prevent shrinkage cracking, and improve durability. In addition, the present invention promotes hydration and densification of the internal structure to make dense concrete, thereby improving the strength and durability of the concrete, particularly waterproofness and corrosion resistance, prevents surface cracking and expansion failure caused by drying shrinkage, and can satisfy all of the properties required for pavement, such as watertightness, adhesion, durability, and crack resistance. In particular, in the present invention, as a material that functions to suppress the heat of hydration of concrete, an inorganic latent heat material and an aliphatic hydrocarbon are included in the binder, wherein the inorganic latent heat material generally has the advantage of high latent heat and thermal conductivity, but phase separation occurs, on the other hand, the aliphatic hydrocarbon has the advantage of a long lifespan due to less phase separation, but it has a disadvantage of being expensive in terms of price. Accordingly, in the present invention, an optimum eutectic mixture is applied to the concrete composition according to the appropriate composition ratio of aliphatic hydrocarbons and inorganic materials to shorten the hardening time of the concrete and minimize internal defects of the concrete structure, thereby providing concrete with excellent durability and strength and a pouring method thereof.

Description

Hydration type quick-hardening cement concrete composition comprising functional binder containing and repairing method for road pavement therewith}

The present invention relates to a hydration heat-reducing superhard cement concrete composition containing a functional binder and a road pavement repairing method using the same.

In more detail, the present invention reaches the phase transition temperature range of the concrete hydration temperature by premixing latent heat material to the concrete binder for the civil structure repair work made of concrete, such as bridge overlay pavement, concrete pavement extension, and concrete pavement repair work. Reduction of hydration heat containing a binding material having a latent heat characteristic that can reduce the temperature stress by reducing the maximum hydration temperature of concrete and controlling the hydration speed by suppressing a rapid rise in hydration temperature through heat absorption and heat release effects Type superhard cement concrete composition and road pavement repair method using the same.

In particular, in the present invention, considering the characteristics of the latent heat material, an inorganic latent heat material and an aliphatic hydrocarbon compound are included in the binder, but the inorganic latent heat material generally has an advantage of high latent heat and high thermal conductivity, but has a phase separation phenomenon and has disadvantages. The compound has the advantage that the phase separation phenomenon is less than that of the inorganic latent heat material, so that its life is long, but it has a disadvantage in that it is expensive in price. Accordingly, in the present invention, an inorganic eutectic heat material and an aliphatic hydrocarbon compound are applied to the concrete composition according to an appropriate composition ratio, thereby shortening the curing time of the concrete and minimizing internal defects of the concrete structure. Provides a method.

The bridge pavement is designed and constructed for the purpose of securing the vehicle's drivability while protecting the bridge deck from traffic impact, chemical erosion, and other weather conditions. As a traditional bridge pavement method, asphalt concrete pavement using asphalt, which is a general road pavement material, and a method using a waterproof sheet have been mainly used, but they are covered within about 5 years due to premature damage due to plastic deformation, degradation due to cracking, settlement, etc. There are serious problems in maintenance that need to be repaired/reinforced. A latex modified concrete (Latex Modified) that has been durable for many years since the LMC (Latex Modified Concrete) method was developed as a method to improve the problems that the existing bridge packaging method had, and can improve the excellent crack generation and waterproof and adhesion performance. Concrete; hereinafter referred to as LMC) Since the bridge pavement method was developed and applied in Korea, active construction and research and development have been in progress.

On the other hand, in recent years, it is mainly used to manufacture concrete using super-hard cement, but due to the characteristics of concrete, solid durability is required, but in the case of using super-hard cement, the quality of concrete is deteriorated due to the high temperature hydration heat and micro-shrinkage. , It has become a major cause of promoting the deterioration of the structure by penetrating moisture and salt into the bridge slab. In particular, most of the cracks generated during construction are due to the characteristics of superhard cement that expresses the initial strength, and as time goes by, not only local cracks are generated but also lead to damage, leading to a decrease in the durability of the entire bridge, which is a serious result that does not fill the design life. Leads to.

Phase Change Materials (PCM) refers to materials that utilize latent heat characteristics that absorb or release heat as a substance changes from solid to liquid or from liquid to gas, and is also called a phase change material. Therefore, when used in a concrete composition, it functions as a latent heat material. This material has the advantage of being able to convert the melting point depending on the purpose of use, so it is mainly used as a heat exchange paint, etc. It is a construction material that is used in various fields, such as new construction technologies related to the reduction of heat of hydration of mass concrete. The heat of dissolution of PCM is an intrinsic property of materials, and since the phase transition temperature and heat of dissolution differ depending on the material, it is necessary to select an appropriate latent heat material according to the purpose of use even in the same concrete composition.

As a technology reflecting this point, Korean Patent Registration No. 10-0683131 discloses a phase change material for concrete and a method for manufacturing the same. This technology is characterized by manufacturing a phase change material including a paraffin wax nonionic surfactant, anionic surfactant and water, which is an organic latent heat material, and applying a microencapsulated creamy phase change material to concrete to increase the hydration temperature. There is an advantage of lowering and improving the initial strength, but there is a problem that the encapsulation manufacturing process is complicated and expensive. In addition, the cream-type microcapsule phase change material prepared by using an organic paraffin wax and a surfactant has improved the hydrophilicity to concrete by applying an anionic surfactant, but has a very low specific gravity compared to concrete, so it may emerge in the concrete mixing process. There is a concern, and the cost of the cream-like microcapsules containing the phase change material is high, which can limit the amount of use, and also poses other problems that can place a burden on construction.

Accordingly, the present inventors have completed the present invention by blending an optimal latent heat material, a surface-modified cement, etc., and a binder material containing cement to improve the performance of a super-fast cement concrete composition containing latent heat components.

Republic of Korea Registered Patent No. 10-0943312 (Invention name: super-hard cement concrete composition and concrete pavement repairing method using the same, Applicant: Ko Gwang-sik and 2 others, registration date: February 11, 2010) Republic of Korea Registered Patent No. 10-1030165 (Invention name: super hard cement latex modified mortar composition and method of constructing a waterproof waterproof layer for concrete bridges using the same, Applicant: Bong-Kyu Lee and 3 others, registration date: April 12, 2011) Republic of Korea Registered Patent No. 10-0337025 (Invention name: microcapsule type latent heat particulate slurry manufacturing method, Applicant: Korea Institute of Energy Research and others, registration date: May 04, 2002) Republic of Korea Registered Patent No. 10-0683131 (Invention name: phase change material for concrete and its manufacturing method, Applicant: GS Construction Co., Ltd., registration date: February 08, 2007) Republic of Korea Registered Patent No. 10-1796418 (Invention name: Sokkyungseong super steel cement concrete composition and concrete pavement repairing method using the same, Applicant: F1 Tech Co., Ltd. and 2 others, Registration date: November 03, 2017) Republic of Korea Registered Patent No. 10-0802988 (Invention name: Premix type ultra-low heat bonding material composition with latent heat characteristic and method for reducing concrete hydration temperature using the same, Applicant: Daelim Industrial Co., Ltd. and 2 others, registration date: February 04, 2008)

An object of the present invention is to provide a hydration heat-reducing superhard cement concrete composition containing a functional binder and a road pavement repairing method using the same.

In more detail, the object of the present invention is a phase transition temperature range of concrete hydration temperature by premixing latent heat material to a concrete binder for civil engineering structure construction of concrete such as bridge overlay pavement, expansion of concrete pavement, and concrete pavement repair work. It contains a functional latent heat-reducing material with the ability to reduce the temperature stress by reducing the maximum hydration temperature of concrete and suppressing the hydration rate by suppressing the rapid rise of hydration temperature through the heat absorption and heat release effects when reaching In order to provide a hydration heat-reducing super-hard cement concrete composition and a road pavement repair method using the same.

The present invention relates to a hydrating heat-reducing superhard cement concrete composition containing a functional binder.

The functional binder is a cement modified with a polycarboxylate-based admixture, a blast furnace slag fine powder, calcium sulfo aluminate, alumina cement, gypsum powder, slaked lime, two types of inorganic latent heat-absorbing materials and aliphatic hydrocarbons, surface-modified with a polycarboxylate admixture. It may be included.

Preferably, the binder is 30-40% by weight of a cement modified with a polycarboxylate admixture and 5-10% by weight of blast furnace slag powder, 15-25% by weight of calcium sulfoaluminate, 5-15% by weight of alumina cement, gypsum Powder may include 7 to 15% by weight, 5 to 10% by weight of slaked lime, 0.5 to 3% by weight of two types of inorganic latent heat, and 1 to 3% by weight of aliphatic hydrocarbons.

The inorganic latent heat material includes at least one selected from Al ₂ (SO ₄ ) ₃ ·10H ₂ O, Mg(SO ₃ ) ₂ ·6H ₂ O, ZnSO ₄ ·7H ₂ O, and Na ₂ SO ₄ ·10H ₂ O It is characterized by being.

The aliphatic hydrocarbon compound is n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane, n-eic acid, n-heneic acid, n-docoic acid , n-tricoic acid, n-tetracoic acid, n-pentacoic acid, n-hexacoic acid, n-heptacoic acid, and n-octacoic acid.

The hydration heat-reducing ultra-fast cement concrete composition may include water, the functional binder, fine aggregate, coarse aggregate, latex synthetic polymer, curing accelerator, and citric acid anhydride.

Even more preferably, the hydration heat-reducing type superhard cement concrete composition is 320 to 420 parts by weight of the binder, 100 to 1250 parts by weight of the aggregate, 300 to 600 parts by weight of the coarse aggregate, and 70 to 150 parts by weight of the latex synthetic polymer. , Curing accelerator 5 to 12 parts by weight and anhydrous citric acid 1 to 5 parts by weight.

The present invention also provides a road pavement repairing method using the hydration heat-reducing super-hard cement concrete composition.

The method, more preferably as a pavement repair method using a cement composition, cutting and blasting the road surface using a crusher, a planing machine, and a shot blaster to remove raytans and impurities; Cleaning the removed area; Maintaining a wet state by sprinkling the cleaned area; After maintaining the wet state, a step of blooming or primer treatment to obtain a high adhesion and waterproof effect; Pouring the cemented carbide composition of the present invention on the top of the treated with the blooming or primer; Spraying a curing agent to prevent initial plastic cracking by preventing evaporation of water at the top after pouring; A step of tinting to increase crack resistance and slip resistance after spraying the curing agent; And curing.

The present invention relates to a hydration heat-reducing superhard cement concrete composition containing a functional binder and a road pavement repairing method using the same, by using the binder, the workability and workability of concrete can be improved, and the toughness and adhesion strength of concrete To reduce shrinkage, prevent shrinkage cracking, and improve durability. In addition, it is possible to improve the strength and durability of concrete, especially waterproof and corrosion resistance, by promoting hydration and densification of internal tissues, thereby improving the strength and durability of concrete, preventing surface cracking and expansion and destruction by dry shrinkage, and packaging. All of the required properties, namely water tightness, adhesion, durability, and crack resistance, can be satisfied.

Particularly, in the present invention, as a latent heat functional material, an inorganic latent heat material and an aliphatic hydrocarbon are included in the binding material, but the inorganic latent heat material generally has an advantage of high latent heat and high thermal conductivity, but has a phase separation phenomenon and disadvantages, whereas an aliphatic hydrocarbon has a phase separation. It has the advantage that it has a small phenomenon and has a long service life, but it has the disadvantage of being expensive in terms of price. Therefore, in the present invention, the optimal eutectic mixture is applied to the concrete composition according to the appropriate composition ratio of the inorganic latent heat and the aliphatic hydrocarbon to shorten the curing time of the concrete and minimize internal defects in the concrete structure, thereby providing excellent durability and strength of concrete and its pouring method Gives

The present invention relates to a hydration heat-reducing superhard cement concrete composition containing a functional binder, and the functional binder used in the present invention is a cement modified with a polycarboxylate-based admixture, and a blast furnace slag modified with a polycarboxylate-based admixture. Fine powder, calcium sulfoaluminate, alumina cement, gypsum powder, slaked lime, two types of inorganic latent heat-containing materials and functional binders including aliphatic hydrocarbons may be included, preferably 30-40 cement modified with a polycarboxylate-based admixture 5% by weight, 5 to 10% by weight of fine powder of blast furnace slag surface modified with a polycarboxylate admixture, 15 to 25% by weight of calcium sulfoaluminate, 5 to 15% by weight of alumina cement, 7 to 15% by weight of gypsum powder, 5 to slaked lime 10% by weight, 0.5 to 3% by weight of two types of inorganic latent heat and 1 to 3% by weight of aliphatic hydrocarbons may be included.

The cement may be any of those specified in KS, but more preferably, the powder may be used in the range of 4500 to 5800 cm 2 /g. At this time, when the powder degree exceeds 5800 cm 2 /g, the initial hydration heat may increase as the hydration reactivity increases.

As the surface modifier of the cement, the polycarboxylate admixture may be selected from one or more of a (meth)acrylic acid-based copolymer having a polyalkylene glycol chain and a maleic acid-based copolymer having a polyalkylene glycol chain.

The (meth)acrylic acid-based copolymer having a polyalkylene glycol chain is an acrylic acid in which the pendant chain of the polymer has a plurality of oxyalkylene or carboxyl groups, and thus the oxyalkylene group is a main component of the polymer. It may be a grafted acrylic acid in propylene glycol.

The maleic acid-based copolymer having a polyalkylene glycol chain is methyl polyethylene glycol vinyl ether-maleic anhydride copolymer, polyethylene glycol allyl ether-maleic anhydride copolymer, methyl polyethylene glycol allyl ether-maleic anhydride copolymer, methacrylic Acid methyl polyethylene glycol-maleic acid copolymer, and the like.

The polycarboxylate-based admixture can achieve a three-dimensional effect due to the electrostatic repulsion and side chains of the main chain in relation to the improvement of the dispersing power of the particles of cement, and also has an effect due to the penetration pressure obtained while the two effects work simultaneously. These concrete admixtures are generally known as lignin-based, naphthalene-based, melamine-based, and polycarboxylic acid-based chemical admixtures, but in the case of lignin-based, naphthalene-based and melamine-based chemical admixtures, the effect of reduction by static mechanical repulsion is dominant, and the steric effect is predominant. It is known that the sensitization effect by shows below-expected performance, and sudden slump loss occurs. On the other hand, the polycarboxylate-based admixture acts as an electrostatic repulsive force, a three-dimensional effect, and a penetrating pressure effect acting as a synergistic effect by two effects thereof, and is characterized by high water-reducing effect, workability, and low slump loss.

The method for modifying the polycarboxylate-based admixture is not particularly limited as long as it is a method capable of adsorbing a modifier on the surface of the cement, but a diethylene glycol solution is used to disperse it uniformly when added to the cement, and sprayed onto the cement. It is preferably added, and more preferably gasified and sprayed through heating. After this, it is desirable to knead the modifier so that it spreads widely throughout the cement. As a spray nozzle used for spraying, any spray nozzle generally used for applications such as application, humidity control, and humidification can be used.

In more detail, the polycarboxylate-based admixture may be mixed with diethylene glycol to be used as a modifier. It is preferred that the admixture is mixed with 10-40% by weight and diethylene glycol 60-90% by weight to be used as a modifier. More specifically, when spraying the modifier, in order to prevent solidification at the tip of the nozzle, it is preferable to set the diethylene glycol content in the modifier to about 60% by weight or more, and a polycarboxylic acid-based water reducing agent exhibiting a modifying function ( It is preferable to make it less than about 90% by weight so that the amount of solid content) may not be extremely reduced. On the other hand, since diethylene glycol is included in the modifier, if it is excessively added when modifying the surface of cement, when it is mixed with a concrete composition, the binding property of cement may be lowered, which is not preferable. For this reason, the modifier is preferably added in an amount of 1 part by weight or less based on 100 parts by weight of cement before modification, and more preferably 0.5 part by weight or less. However, if the amount of the modifier added is too small, the effect of prolonging the gelation time is insufficient, so the modifier is preferably added in an amount of 0.1 part by weight or more with respect to 100 parts by weight of cement before modification, and more preferably 0.2 part by weight or more.

The surface-modified cement with the polycarboxylate-based admixture preferably contains 30 to 40% by weight based on 100% by weight of the functional binder, and even if it is less than 30% by weight or exceeds 40% by weight, the function as a functional binder may be deteriorated. It is not desirable.

The blast furnace slag fine powder surface-modified with a polycarboxylate-based admixture used in the present invention is characterized in that it is used by surface-modifying under the same conditions as the method for surface-modifying cement with the polycarboxylate-based admixture. The powder level of the blast furnace slag fine powder before surface modification is 6000 to 8000 cm 2 /g, and the blast furnace slag fine powder has latent hydraulic properties and exhibits pozzolanic reactivity, and can be used for long-term strength development and durability enhancement and reduction of hydration heat. If the powder level of the blast furnace slag powder is lower than 6000 cm 2 /g, pozzolan reactivity may be low, and when the powder level is 8000 cm 2 /g or more, pozzolan reactivity is high, but the cost may be high and economic efficiency may be deteriorated.

The blast furnace slag fine powder surface-modified with the polycarboxylate-based admixture is preferably 5 to 10% by weight based on 100% by weight of the functional binder. If it is less than 5% by weight, long-term strength expression may be weak, and 10% by weight If it exceeds, the initial intensity development may be delayed.

The calcium sulfoaluminate is preferably included 15 to 25% by weight based on 100% by weight of the functional binder. If it is less than 15% by weight or more than 25% by weight, it will cause problems in durability of the final manufactured concrete.

The alumina cement is used for initial strength development and prevention of shrinkage. The alumina cement is used to prevent cracking of concrete and shrinkage of concrete by compacting the structure. The alumina cement is preferably contained 5 to 15% by weight based on 100% by weight of the binder. The alumina cement exhibits rapid curing properties when the weight ratio is increased, and if the content of the alumina cement is less than 5% by weight relative to the binder, the effect of inhibiting the initial strength of concrete and cracking may be weak, and the content of the alumina cement is 15% by weight If it exceeds %, good physical properties can be obtained due to the fast curing properties, but the manufacturing cost is high, which is not economical .

The gypsum powder used in the present invention is characterized in that the anhydrous gypsum and semi-hydrate gypsum are used by mixing in a weight ratio of 1:1 to 2:1, and it is preferable that 7 to 15% by weight is included based on 100% by weight of the functional binder. It is recommended to use these gypsum powders of 5500~8500cm2/g, and the gypsum compacts the structure of hydrated minerals, prevents shrinkage of concrete, and functions to control the hydration rate of cement minerals. Therefore, when the content of gypsum powder in the binder is less than 7% by weight, the ability to control the hydration rate by gypsum cannot be expected, the effect of preventing the shrinkage of concrete cannot be expected, and when the gypsum powder content exceeds 15% by weight, hydration The delay in speed may slow the initial intensity development.

It is preferable that the slaked lime in the functional binder contains 5 to 10% by weight based on 100% by weight of the binder. Calcium sulfo aluminate, gypsum powder, cement, and composite calcium aluminate minerals are additionally added to the superhard concrete composition, and the initial strength is Al ³⁺ ions eluted from calcium sulfoaluminate during hydration reaction and Ca eluted from cement and slaked lime. ²⁺ ions react to form calcium aluminate hydrate, and react with gypsum to form acicular ethrinite (C3A·3CaSO ₄ ·32H ₂ O) to rapidly accelerate curing. Therefore, when slaked lime is added in an amount of 5% by weight or more based on 100% by weight of a functional binder, structural properties such as compressive strength and adhesion strength are overcome by overcoming difficulties in securing low-temperature heat generation characteristics and super-fast hardness by promoting initial hydration reaction rate and hydration heat. Because it is excellent, it can be opened within 4 hours after opening and repairing the road. Furthermore, when slaked lime exceeds 10% by weight in the functional binder, durability characteristics such as salt penetration resistance and freeze-thaw resistance are deteriorated, making it unsuitable as a pavement and repair material, and in addition, it is not possible to secure economic efficiency and construction safety. .

In the present invention, the inorganic latent heat material and the aliphatic hydrocarbon compound function to reduce the heat of hydration generated when the cement is hydrated. Cement generates high heat of hydration in the initial hydration stage. The heat of hydration is the biggest cause of concrete cracking, and the crack caused by heat of hydration in roads and bridges that occupy a large area such as pavement and pavement is the biggest cause of weakening durability.

Among these, inorganic latent heat materials generally have advantages of high latent heat and high thermal conductivity, but have phase separation and disadvantages. On the other hand, the aliphatic hydrocarbon compound has the advantage of having a longer phase separation phenomenon than the inorganic latent heat material, and has a long service life, but has a disadvantage in that it is expensive in price. However, these inorganic latent heat or aliphatic hydrocarbons can be applied to the concrete composition according to an appropriate composition ratio to shorten the curing time of the concrete and minimize internal defects in the concrete structure, thereby improving durability and strength.

The inorganic latent heat is at least two of the group consisting of Al ₂ (SO ₄ ) ₃ ·10H ₂ O, Mg(SO ₃ ) ₂ ·6H ₂ O, ZnSO ₄ ·7H ₂ O and Na ₂ SO ₄ ·10H ₂ O It may be selected, and the aliphatic hydrocarbon compound, more specifically n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecan, n-eic acid, At least one selected from the group consisting of n-heneic acid, n-docoic acid, n-tricoic acid, n-tetracoic acid, n-pentacoic acid, n-hexacoic acid, n-heptaconic acid, and n-octacoic acid Can be.

Thus, the two types of inorganic latent heat-absorbing materials and aliphatic hydrocarbon compounds included in the functional binder of the present invention preferably contain 0.5 to 3% by weight based on 100% by weight of the binder, respectively. At this time, when the inorganic latent heat-generating material and the aliphatic hydrocarbon compound are each less than 0.5% by weight, the function of absorbing the initial hydration heat of concrete may be weak and the effect of reducing the heat of hydration may be low, and the inorganic latent heat-generating material and the aliphatic hydrocarbon compound are respectively If it exceeds 3% by weight, the temperature of the concrete in the initial hydration step is lowered, the reactivity decreases and the hydration rate may decrease. In addition, the inorganic latent heat material is contained alone, and it is not preferable because it may affect the strength or durability of the final concrete composition even when one of the inorganic latent heat materials and an aliphatic hydrocarbon compound is included. Therefore, in the present invention, it is preferable that two types of inorganic latent heat insulating materials and one or more aliphatic hydrocarbon compounds are included together.

Hydration heat reduction type superhard cement concrete composition of the present invention is based on 100 parts by weight of water, the functional binder 320-420 parts by weight, fine aggregate 800-1250 parts by weight, coarse aggregate 300-600 parts by weight, latex synthetic polymer 70-150 parts by weight , Curing accelerator 5 to 12 parts by weight and anhydrous citric acid 1 to 5 parts by weight.

It is preferable that the functional binder in the hydration heat reduction type superhard cement concrete composition includes 320 to 420 parts by weight based on 100 parts by weight of water, but if it is less than 320 parts by weight, the function of absorbing the initial hydration heat of concrete is weak, so the effect of reducing hydration heat is low. If it exceeds 420 parts by weight, the temperature of the concrete in the initial hydration stage is lowered, the reactivity decreases, and the hydration rate may decrease.

Aggregates used in the cement composition in the present invention are divided into fine aggregates and coarse aggregates, those having a particle diameter of 5 mm or less are referred to as fine aggregates, and those having a particle size greater than 5 mm are classified into coarse aggregates. It is desirable that the cement concrete composition includes 800 to 1250 parts by weight of fine aggregate and 300 to 600 parts by weight of coarse aggregate based on 100 parts by weight of water. If the content ratio of fine aggregate and coarse aggregate is misaligned, the strength or durability of the final concrete may not be good. Can.

The latex synthetic polymer preferably contains 70 to 150 parts by weight based on 100 parts by weight of water in the cement concrete composition, and if it is less than 70 parts by weight, or more than 150 parts by weight, the strength or durability of the final concrete may also be poor. . At this time, the concentration of the latex synthetic polymer used in the present invention is preferably 40 to 60 (w/v). The latex synthetic polymer has a glass transition temperature (Tg) of about -10°C to 30°C, preferably consists of vinyl acetate having a molecular weight of 86.1 g/mol, and is dispersed in a final particle size of 30nm to 1500nm. .

The curing accelerator is used to control the initial curing rate. The curing accelerator is preferably contained 5 to 12 parts by weight based on 100 parts by weight of water. When the content of the curing accelerator is less than 5 parts by weight, initial strength development is delayed, and when the content of the curing accelerator exceeds 12 parts by weight, reactivity becomes high, thereby reducing workability and lowering price competitiveness. The curing accelerator may be one or more compounds selected from CalciumFormate (Ca(HCOO) ₂ ), Li ₂ CO ₃ , CaCl ₂ , K ₂ SO ₄ , Na ₂ CO ₃ .

The anhydrous citric acid is preferably contained 1 to 5 parts by weight compared to 100 parts by weight of water, it is used as a retardant when working with cement concrete, the retardant secures workability for a certain time and delays rapid curing Can be used for Instead of the citric anhydride, sugars such as glucose, glucose, textrin and dextran, acids such as gluconic acid and malic acid or salts thereof, aminocarboxylic acids or salts thereof, phosphonic acids or derivatives thereof, polyhydric alcohols such as glycerin can be used.

The present invention also provides a road pavement repairing method using the hydration heat-reducing super-hard cement concrete composition.

Even more preferably, as a pavement repairing method using a cement composition, cutting and blasting a road surface using a crusher, a planing machine, or a short blaster to remove raytans and impurities; Cleaning the removed area; Maintaining a wet state by sprinkling the cleaned area; After maintaining the wet state, a step of blooming or primer treatment to obtain a high adhesion and waterproof effect; Pouring the cemented carbide composition of the present invention on the top of the treated with the blooming or primer; Spraying a curing agent to prevent initial plastic cracking by preventing evaporation of water at the top after pouring; A step of tinting to increase crack resistance and slip resistance after spraying the curing agent; And curing.

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.

Hereinafter, the blooming or primer treatment is used to mean an operation that facilitates adhesion of the hydration heat-reducing superhard cement concrete composition 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.

At this time, the blooming material or primer is good to construct by lowering the content of the solid content to about 10% by weight, but the film thickness generated when the solid content is used in excess of 10% by weight can be thickened, but the adhesion performance may be deteriorated.

Hereinafter, embodiments of the hydration heat reducing superhard cement concrete composition according to the present invention are presented in more detail, and the present invention is not limited by the following examples.

<Example 1 and Comparative Example 1. Preparation of binder for adding concrete>

Each component was mixed under the conditions of Table 1 below, and a binder for adding concrete was added.

At this time, the cement surface-modified with a polycarboxylate admixture is 0.3 g per 100 g of the polycarboxylate admixture obtained by mixing a methyl polyethylene glycol vinyl ether-maleic anhydride copolymer and diethylene glycol in a weight ratio of 40:60. It was prepared by gasification through heating after addition and spraying. The blast furnace slag fine powder surface-modified with a polycarboxylate-based admixture is similarly obtained by mixing the methyl polyethylene glycol vinyl ether-maleic anhydride copolymer with diethylene glycol in a weight ratio of 40:60, and the polycarboxylate admixture 100 g of the blast furnace slag fine powder. It was prepared by adding 0.3 g of sugar and then gasifying and spraying it through heating.

As the gypsum powder, anhydrous gypsum and hemihydrate gypsum were used in a weight ratio of 1:1.

Condition Surface modified
cement
(g) Surface modified blast furnace
Slag
Fine powder
(g) calcium
Sulfo
Aluminate
(g) Alumina cement
(g) Gypsum powder
(g) Slaked lime
(g) Al ₂ (SO ₄ ) ₃ ·10H ₂ O
(g) ZnSO ₄ · 7H ₂ O n-hexadecane
(g) sum
(g) Example 1-1 39.5 5 25 15 7 5 0.5 2 One 100 Example 1-2 30 10 25 5 15 10 2 One 2 100 Example 1-3 40 10 15 13 9 9 0.5 0.5 3 100 Comparative Example 1-1 55 9 13 5 9 9 0 0 0 100 Comparative Example 1-2 45 9 17 One 9 9 5 One 4 100 Comparative Example 1-3 35 10 12 22 9 9 3 0 0 100 Comparative Example 1-4 35 7 25 10 7 7 0 9 0 100 Comparative Example 1-5 30 15 10 10 20 12 3 0 0 100

<Example 2 and Comparative Example 2. Preparation of concrete composition according to component content ratio>

Under the conditions of Table 2, the binding material of Example 1-1, fine aggregate, coarse aggregate, hardening accelerator (CaCl ₂ ), and anhydrous citric acid were added to a forced mixer and stirred, and then water and latex synthetic polymer liquid were added to add 2 again. By stirring for a minute, a hydration heat-reducing ultra-fast cemented concrete composition was prepared.

Condition water
(g) Binder of Example 1-1
(g) Fine aggregate
(g) Coarse aggregate
(g) Latex synthetic polymer liquid (47(w/v)%)
(g) Curing accelerator
(g) myriad
Citric acid
(g) total
(g) Example 2-1 100 320 1250 310 70 5 5 2060 Example 2-2 100 420 800 588 140 11 One 2060 Example 2-3 100 380 1090 400 80 7 3 2060 Comparative Example 2-1 100 280 1110 510 50 10 0 2060 Comparative Example 2-2 100 500 972 400 80 0 8 2060 Comparative Example 2-3 100 320 990 440 180 30 0 2060

<Example 3 and Comparative Example 3. Preparation of concrete composition according to the composition of the binder>

In the method of Example 2 and Comparative Example 2, a cemented carbide concrete composition was prepared, but the binder was replaced with the conditions shown in Table 3 to prepare a cemented carbide composition.

Condition Concrete composition according to the type of binder Example 3-1 Concrete composition using the bonding material of Example 1-2 Example 3-2 Concrete composition using the bonding material of Examples 1-3 Comparative Example 3-1 Concrete composition using the binding material of Comparative Example 1-1 Comparative Example 3-2 Concrete composition using the binder of Comparative Example 1-2 Comparative Example 3-3 Concrete composition using the bonding material of Comparative Examples 1-3 Comparative Example 3-4 Concrete composition using the binder of Comparative Example 1-4 Comparative Example 3-5 Concrete composition using the binder of Comparative Example 1-5

<Test Example 1. Slump test>

The cement concrete compositions of Examples 2 and 3 and Comparative Examples 2 and 3 were subjected to a slump test (degree of kneading) according to the method specified in KS F 2402, and the results are shown in Table 4 below. The slump test is to test the consistency of the dough such as the softness and consistency of concrete, and the larger the value, the better the workability, that is, the excellent workability when pouring concrete.

Condition Slump (cm) Immediately after stirring After 20 minutes Example 2-1 20 19.1 Example 2-2 20 18.2 Example 2-3 20 18.7 Example 3-1 20 18.0 Example 3-2 20 19.2 Comparative Example 2-1 20 13.2 Comparative Example 2-2 20 14.3 Comparative Example 2-3 20 15.1 Comparative Example 3-1 20 13.4 Comparative Example 3-2 20 14.1 Comparative Example 3-3 20 15.4 Comparative Example 3-4 20 15.2 Comparative Example 3-5 20 16.1

In general, in the slump test, the slump of 19±3cm is evaluated as the proper workability of the concrete for paving, and it can be said to be a concrete with excellent workability when there is little slump loss until a certain time (around 30 minutes). Therefore, if the slump loss is large in a rather short time (20 minutes), it cannot be said that it is concrete with excellent workability in the field.

Thus, as shown in Table 4, it can be confirmed that the cemented concrete compositions prepared according to Examples 2 and 3 are superior in workability to those prepared according to Comparative Examples 2 and 3.

<Test Example 2. Compressive strength measurement>

The compressive strength of the cement concrete compositions of Examples 2 and 3 and Comparative Examples 2 and 3 was measured according to the method specified in KS F 2405, and the values over time are shown in Table 5 below. In the present invention, the compressive strength suitable for use as concrete was based on about 21 Mpa or more in 4 hours.

division Compressive strength after 4 hours (Mpa) Example 2-1 25.5 Example 2-2 24.8 Example 2-3 23.6 Example 3-1 22.2 Example 3-2 24.3 Comparative Example 2-1 19.5 Comparative Example 2-2 20.5 Comparative Example 2-3 19.3 Comparative Example 3-1 18.2 Comparative Example 3-2 19.4 Comparative Example 3-3 19.2 Comparative Example 3-4 20.1 Comparative Example 3-5 18.6

As shown in Table 5, the superhard cemented concrete composition prepared according to Examples 1 to 3 was cured after 4 hours after construction, so that other operations could be performed on the poured concrete. In addition, even after being completely cured, the super-hard cementitious concrete compositions prepared according to Examples 2 and 3 had higher compressive strength than the cement concrete compositions prepared according to Comparative Examples 2 and 3.

<Test Example 3. Measurement of bending strength>

The results of measuring the flexural strength of the cement concrete compositions of Examples 2 and 3 and Comparative Examples 2 and 3 according to the method defined in KS F 2408 are shown in Table 6 below. In the present invention, the flexural strength suitable for use as concrete was based on about 4.5 Mpa or more in 4 hours.

division Flexural strength after 4 hours (Mpa) Example 2-1 4.75 Example 2-2 4.62 Example 2-3 4.83 Example 3-1 4.97 Example 3-2 4.84 Comparative Example 2-1 3.80 Comparative Example 2-2 3.91 Comparative Example 2-3 4.13 Comparative Example 3-1 4.11 Comparative Example 3-2 4.19 Comparative Example 3-3 3.91 Comparative Example 3-4 3.95 Comparative Example 3-5 4.23

Referring to Table 6, the superhard cemented concrete compositions prepared according to Examples 2 and 3 were cured after 4 hours after construction to generate resistance to external loads so that no deformation of the concrete occurred. In addition, after 28 days when the concrete was completely cured, the superhard cemented concrete compositions prepared according to Examples 2 and 3 had significantly higher flexural strength than the cemented concrete compositions prepared according to Comparative Examples 2 and 3.

<Test Example 4. Measurement of adhesion strength>

The adhesion strength of the cement concrete compositions of Examples 2 and 3 and Comparative Examples 2 and 3 was measured according to the method defined in KS F 2762, and the results are shown in Table 7. In the present invention, the adhesion strength suitable for use as concrete was based on about 1.4 Mpa or more in 4 hours.

division Adhesion strength after 4 hours (Mpa) Example 2-1 1.69 Example 2-2 1.53 Example 2-3 1.47 Example 3-1 1.59 Example 3-2 1.65 Comparative Example 2-1 1.32 Comparative Example 2-2 1.21 Comparative Example 2-3 1.23 Comparative Example 3-1 1.32 Comparative Example 3-2 1.25 Comparative Example 3-3 1.36 Comparative Example 3-4 1.30 Comparative Example 3-5 1.24

As a result, as disclosed in Table 7, the cemented concrete compositions prepared according to Examples 2 and 3 were significantly higher in adhesion strength than those prepared according to Comparative Examples 2 and 3.

<Test Example 5. Hydration heat maximum rise temperature measurement>

The maximum rise temperature of hydration heat was measured for the cement concrete compositions of Examples 2 and 3 and Comparative Examples 2 and 3, and the results are shown in Table 8 below. In the present invention, the maximum temperature of hydration heat suitable for use as concrete was 30 to 40°C.

division Maximum hydration temperature (℃) Example 2-1 36.1 Example 2-2 34.3 Example 2-3 32.7 Example 3-1 34.2 Example 3-2 35.2 Comparative Example 2-1 68.2 Comparative Example 2-2 29.3 Comparative Example 2-3 34.4 Comparative Example 3-1 65.6 Comparative Example 3-2 29.9 Comparative Example 3-3 65.4 Comparative Example 3-4 67.8 Comparative Example 3-5 65.2

As a result of the experiment, the time when the heat of hydration rose to the highest was about 100 minutes, and before that, it showed a tendency to rise sharply and fall again after 100 minutes. According to Table 8, compared to the cemented concrete composition prepared according to Comparative Examples 2 and 3, the superhard cemented concrete composition prepared according to Examples 2 and 3 maintains 30 to 40° C. to show good control. Can be. On the other hand, in Comparative Examples 2 and 3, in addition to the high temperature of 60°C or more, lower heat of hydration than the reference value of less than 30°C may occur, but in this case, the temperature of the concrete decreases and the reactivity decreases, making it more suitable for use in pavement or other pouring. not.

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

Claims (6)

Functional binder based on 100 parts by weight of water 320 to 420 parts by weight of functional binder, 800 to 1250 parts by weight of fine aggregate, 300 to 600 parts by weight of coarse aggregate, 70 to 150 parts by weight of latex synthetic polymer, 5 to 12 parts by weight of curing accelerator, and citric anhydride 1~ A hydrating heat-reducing cemented carbide concrete composition comprising 5 parts by weight,
The functional binder is 30-40% by weight of the cement surface-modified with a polycarboxylate admixture and 5-10% by weight of blast furnace slag powder, 15-25% by weight of calcium sulfoaluminate, 5-15% by weight of alumina cement, gypsum powder 7 ~15% by weight, 5~10% by weight of slaked lime, 0.5~3% by weight of two types of inorganic latent heat and 1~3% by weight of aliphatic hydrocarbons,
The inorganic latent heat is at least one of the group consisting of Al ₂ (SO ₄ ) ₃ ·10H ₂ O, Mg(SO ₃ ) ₂ ·6H ₂ O, ZnSO ₄ ·7H ₂ O and Na ₂ SO ₄ ·10H ₂ O Is selected,
The aliphatic hydrocarbon compound is n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecan, n-eic acid, n-heneic acid, n-docoic acid Hydration heat-reducing ultra-fast cement, characterized in that at least one selected from the group consisting of, n-tricoic acid, n-tetracoic acid, n-pentacoic acid, n-hexacoic acid, n-heptaconic acid and n-octacoic acid Concrete composition. delete delete delete A road pavement repairing method using the super-hard cemented concrete composition of claim 1 with reduced hydration heat. The method of claim 5,
The road pavement repair method includes: cutting and blasting a road surface using a crusher, a planing machine, and a shot blaster to remove raytans and impurities; Cleaning the removed area; Maintaining a wet state by sprinkling the cleaned area; After maintaining the wet state, a step of blooming or primer treatment to obtain a high adhesion and waterproof effect; Pouring a cemented carbide composition of claim 1 on the top of the treated with the bloom or primer; Spraying a curing agent to prevent initial plastic cracking by preventing evaporation of water at the top after pouring; A step of tinting to increase crack resistance and slip resistance after spraying the curing agent; Road pavement repair method comprising the step of curing.