KR101194556B1 - Modified early strength concrete composite using inorganic emulsion comprising sulfur and acrylic emulsion and repairing method of concrete structure using the composite - Google Patents

Abstract

PURPOSE: A rapid-curing concrete composition using inorganic binder and acrylic emulsion and a repairing method of concrete structure using the same are provided to enhance workability, bending strength, durability and tensile strength. CONSTITUTION: A rapid-curing concrete composition using inorganic binder and acrylic emulsion comprises 4-35 wt% of inorganic binder, 20-56 wt% of fine aggregate, 0.1-7 wt% of coarse aggregate, and 0.01-13 wt% of water. The inorganic binder comprises 50-99 wt% of quick-setting cement, 0.1-15 wt% of alumina cement, 0.1-15 wt% calcium sulfoaluminate, 0.1-15 wt% of gypsum, 0.1-12 wt% of blast furnace slag, 0.01-5 wt% of metakaolin, and 0.01-5 wt% of sulfur. The acrylic emulsion comprises 60-99 wt% of acrylic resin, 0.1-20 wt% of methyl metacrylate resin, 0.1-15 wt% of butyl acrylate resin, 0.01-7 wt% of polyvinyl methyl ether, and 0.01-7 wt% of polyvinyl amine.

Description

Modified early strength concrete composite using inorganic emulsion containing sulfur and acrylic emulsion and repairing method of concrete structure using the composite}

The present invention relates to a quick-hard concrete composition and a repair method of a concrete structure using the composition, and more specifically, using an inorganic binder and an acrylic emulsion incorporating sulfur used for road surfaces, bridge bridge pavement, urgent repair work, and the like. Modified fast-hard concrete composition and a repair method for a concrete structure using the composition.

Concrete structures, in particular, cracks in concrete due to deterioration in concrete slabs of bridges, road surfaces, and lower parts of bridges. As time passes, the compressive strength of concrete and tensile strength of reinforcing bars are gradually decreased, and exposed through cracks. Concrete is neutralized and corrosion of the rebar occurs. If the corrosion of the reinforcing bar becomes more severe, the concrete structure may eventually collapse. Therefore, when the concrete structure is deteriorated and cracks occur, it is necessary to repair the deteriorated portion as soon as possible.

In order to prevent the deterioration of the concrete and to repair and reinforce the concrete, the construction is usually carried out by stacking several layers of epoxy, glass mat for repair and reinforcement, etc., which is a burden in terms of work time and material cost. In order to overcome the disadvantages of the weak chemical resistance and strength of the concrete, concrete, a concrete technology has been developed to manufacture mortar or concrete by using sulfur as a binder (binder) instead of Portland cement and mixing it with various aggregates.

On the other hand, sulfur is melted at a temperature of 119 ℃ or more, and is a component present as a yellow solid at room temperature. The strength of sulfur is 800 ~ 1000kgf / ㎠, higher than that of cement (300 ~ 400kgf / ㎠), and the price is low. Sulfur is frequently generated as a by-product of crude oil refining in domestic refineries. Some of the sulfur is recovered from crude oil refining and consumed in fertilizer factories, and some uses civil characteristics such as packaging materials and construction materials. And technology for the field of construction has been continuously developed. Such sulfur is known to date as a binder for the production of civil and building materials in the form of moldings by mixing with various aggregates.

A large amount of sulfur from crude oil refining is used in part and most of it is disposed of. It is thought that civil waste materials having excellent tensile strength, elongation rate and brittleness can be developed by the high strength of sulfur in the concrete which is disposed of such waste. In addition, the use of sulfur, which is disposed of in disposal, can reduce the cost of the product.

In the recent emergency repair work, superhard latex modified concrete is added to the superhard cement with latex resin.

However, because the latex modified concrete has a very high viscosity, latex modified concrete has a problem that the concrete adheres to the work tool when the finishing work is performed to smooth the surface of the concrete. As it is very short, about 20 minutes, construction costs such as workability deterioration, and cement prices are very expensive, so construction costs are inevitably increased.

Republic of Korea Patent Publication No. 10-0911659

The problem to be solved by the present invention is to improve the workability by extending the curing time of the concrete using the inorganic binder and the acrylic emulsion in which sulfur is mixed, improve the durability of the concrete, in particular to improve the bending and tensile strength of the concrete It is to provide a modified fast-hard concrete composition that can reduce the defect and a repair method of the concrete structure using the composition.

The present invention comprises 4 to 35% by weight of inorganic binder, 20 to 56% by weight of fine aggregate, 25 to 56% by weight of coarse aggregate, 0.1 to 7% by weight of water and 0.01 to 13% by weight of acrylic emulsion. 50 to 99% by weight of cement, 0.1 to 15% by weight of alumina cement, 0.1 to 15% by weight of calcium sulfoaluminate, 0.1 to 15% by weight of gypsum, 0.1 to 12% by weight of blast furnace slag, 0.01 to 5% by weight of metakaolin and 0.01% of sulfur 15 wt% to 15 wt%, the acrylic emulsion includes 60 to 99 wt% of acrylic resin, 0.1 to 20 wt% of methyl methacrylate resin, 0.1 to 15 wt% of butyl acrylate resin, and 0.01 to 7 wt% of polyvinyl methyl ether. And it provides a modified fast-hard concrete composition using an inorganic binder and an acrylic emulsion incorporating sulfur, characterized in that it comprises 0.01 to 7% by weight of polyvinylamine.

The acrylic emulsion may further comprise 0.01 to 10% by weight of polyethylene glycol monomethacrylate.

The acrylic emulsion may further comprise 0.01 to 10% by weight of an alkyl phenol resin.

The inorganic binder may further comprise 0.001 to 3% by weight of a retarder for maintaining the workability of the modified fast-hard concrete composition.

The inorganic binder may further comprise 0.001 to 3% by weight of a water reducing agent for reducing the water-cement ratio.

In addition, the present invention, the step of weighing and injecting the wet aggregate in the mixer, the step of heating the sulfur to 110 ~ 130 ℃ softening, and the softened sulfur to 0.1 to 20 parts by weight based on 100 parts by weight of the fine aggregate Measuring and inputting the unit, mixing the wet aggregate and sulfur added to the mixer to discharge the sulfur-coated fine aggregate and inorganic binder 4 ~ 35% by weight, the sulfur-coated fine aggregate 20 ~ 56% by weight , 25 to 55% by weight of coarse aggregate is stirred in a mixer, and then the mixture is stirred by further mixing 0.1 to 7% by weight of water and 0.01 to 12% by weight of an acrylic emulsion, and the inorganic binder is 50 to 99 weight of crude cement. %, 0.1-15% by weight of alumina cement, 0.1-15% by weight of calcium sulfoaluminate, 0.1-15% by weight of gypsum, 0.1-12% by weight of blast furnace slag, 0.01-5% by weight of metakaolin and 0.01-15% by weight of sulfur Including the arc The emulsion is 60 to 99% by weight acrylic resin, 0.1 to 20% by weight methyl methacrylate resin, 0.1 to 15% by weight butyl acrylate resin, 0.01 to 7% by weight polyvinyl methyl ether and 0.01 to 7% by weight polyvinylamine It provides a method for producing a modified fast-hard concrete composition using an inorganic binder and an acrylic emulsion incorporating sulfur, characterized in that it comprises a.

In addition, the present invention, the step of removing the impurities and deterioration site by chipping the site where the concrete structure is deteriorated and the concrete is dropped by using a crusher and water jet, and the modified fast-hard concrete of claim 1 to the deterioration site of the concrete Applying a primer that facilitates the composition to adhere to the concrete structure, and pouring the modified fast-hard concrete composition of claim 1 on top of the applied primer to recover the cross section of the degraded site and poured It provides a repair method of the concrete structure comprising the step of applying a curing agent to the modified fast-hard concrete composition on top.

The primer may be made of one or more materials selected from styrene butadiene rubber latex, poly acrylic ester, acrylic and ethylene vinyl acetate.

According to the present invention, by mixing the acrylic emulsion to extend the curing time of the concrete to improve the workability and the durability is improved by the acrylic emulsion, in particular has the effect of improving the bending and tensile strength.

In addition, it is possible to improve the high strength, chemical resistance and the like by using an inorganic binder mixed with sulfur.

In addition, by using the sulfur-coated fine aggregate can reduce the use of unnecessary equipment, the difficulty and quality of construction, which is a problem that occurs during the existing field mixing.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, the following embodiments are provided to those skilled in the art to fully understand the present invention, and may be modified in various forms, and the scope of the present invention is limited to the embodiments described below. It doesn't happen.

Modified fast-hardening concrete composition using an inorganic binder and an acrylic emulsion incorporating sulfur according to a preferred embodiment of the present invention is 4 to 35% by weight of inorganic binder, 20 to 56% by weight aggregate, 25 to 56% by weight coarse aggregate, water 0.1 ˜7% by weight and 0.01 to 13% by weight of an acrylic emulsion.

Aggregates are divided into fine aggregates and coarse aggregates. In the following, fine particles having a particle diameter of 5 mm or less are called fine aggregates, and fine particles larger than 5 mm are classified as coarse aggregates. The fine aggregate is preferably contained 20 to 56% by weight in the modified fast-hard concrete composition, and the coarse aggregate is preferably contained in the entire modified fast-hard concrete composition to 25 to 56% by weight.

The inorganic binder is 50 to 99% by weight of crude steel cement, 0.1 to 15% by weight of alumina cement, 0.1 to 15% by weight of calcium sulfoaluminate, 0.1 to 15% by weight of gypsum, 0.1 to 12% by weight of blast furnace slag, and 0.01 to 5 of metakaolin. It includes by weight and 0.01 to 15% by weight sulfur.

It is preferable to use the thing prescribed | regulated to KS as said cement as a crude steel cement. It is preferable that the said cement is contained in an inorganic binder 50-99 weight%.

The alumina cement and calcium sulfoaluminate are used to improve initial strength expression and crack resistance. When the content of alumina cement and calcium sulfoaluminate is increased, it shows fast curing characteristics. When the combined content of alumina cement and calcium sulfoaluminate is less than 0.2% by weight, the initial strength improvement effect of the modified fast-hard concrete composition is insignificant, and 30% by weight. If it exceeds%, the initial strength is expressed, but poor workability and cracking are likely to occur.

The gypsum is used for initial strength development. Gypsum may use anhydrous gypsum or dihydrate gypsum. When the content of gypsum is increased, it shows fast curing property. If the content is less than 0.1% by weight, the initial strength improvement effect of the modified fast-hardening concrete composition is insignificant. Can be obtained but workability may be degraded.

The metakaolin is used to improve the workability by sufficiently securing the finishing work time to smooth the surface of the poured concrete by improving the strength and durability and extending the concrete work time. Metakaolin is made of mixed materials for concrete by specially treating kaolin, which can be widely used in fillers, refractory materials, rubber, paints, chemicals, and pharmaceuticals. Metakaolin is a mixed material produced by thermally activating high-quality kaolin, and is rich in kaolin, which is a raw material of metakaolin, in Korea. Moreover, metakaolin is a stable material because it is produced by good management control, with very little change in physical and chemical properties. Metakaolin reacts with water to show pozzolanic reactivity upon hydration. Metakaolin increases the initial strength of concrete by producing ettringite and activating C ₃ S in cement due to the fast reaction rate, and densifying voids between particles by reacting with calcium hydroxide and pozzolane in cement. To increase the effect. It is preferable that metakaolin is contained 0.01 to 3 weight% with respect to an inorganic binder. If the content of metakaolin is less than 0.01% by weight, it is difficult to expect the effect of improving the durability, when the content exceeds 5% by weight the initial strength development is delayed and economical.

The blast furnace slag is used for the development of long-term strength and durability as a latent hydraulic. The blast furnace slag is preferably contained 0.1 to 12% by weight based on the inorganic binder. If the content of the blast furnace slag is less than 0.1% by weight it is difficult to expect the effect of improving the durability, when it exceeds 12% by weight the initial strength development is delayed and economical.

The sulfur is melted at a temperature of 119 ℃ or more, and is a component present as a yellow solid at room temperature. The strength of sulfur is 800 ~ 1000kgf / ㎠, higher than that of cement (300 ~ 400kgf / ㎠), and the price is low. Sulfur is frequently generated as a by-product of crude oil refining in domestic refineries. Some of the sulfur is recovered from crude oil refining and consumed in fertilizer factories, and some uses civil characteristics such as packaging materials and construction materials. And technology for the field of construction has been continuously developed. Such sulfur is known to date as a binder for the production of civil and building materials in the form of moldings by mixing with various aggregates.

A large amount of sulfur from crude oil refining is used in part and most of it is disposed of. It is thought that civil waste materials having excellent tensile strength, elongation rate and brittleness can be developed by the high strength of sulfur in the concrete which is disposed of such waste. In addition, the use of sulfur, which is disposed of in disposal, can reduce the cost of the product.

In addition, the inorganic binder may further include a retarder to maintain the workability of the modified fast-hard concrete composition when placing concrete, the retardant is preferably contained in 0.001 to 3% by weight in the inorganic binder. As the retarder, generally well-known substances can be used, such as glucose, glucose, textulin, dextran, sugars such as sodium gluconate, gluconic acid, malic acid, citric acid, tartaric acid, and citric acid ( acids such as citric acid), salts thereof, aminocarboxylic acids or salts thereof, phosphonic acids or derivatives thereof, polyhydric alcohols such as glycerin, and the like. Due to the addition of the retarder, it is possible to delay the workability maintenance (time-varying) time, which is the biggest disadvantage of the existing fast-hardening cement concrete, from 20 to 30 minutes to 35 to 45 minutes to prevent defects occurring in initial workability. Minimize unnecessary human resources.

In addition, the inorganic binder may further include a water reducing agent to reduce the water-cement ratio, the water reducing agent is preferably contained in 0.001 to 3% by weight in the inorganic binder. The addition of the water reducing agent can develop initial strength, reduce the water-cement ratio, thereby improving the resistance to freeze-thawing and improving durability. The water reducing agent may be a polycarboxylic acid-based water reducing agent.

The acrylic emulsion is used to improve the workability by extending the curing time of the concrete. The acrylic emulsion is an emulsion in which an acrylic resin, methyl methacrylate resin, butyl acrylate resin, polyvinyl methyl ether and polyvinylamine are mixed. It is preferable that the said acrylic emulsion is contained 0.01-13 weight% in the said modified fast hard concrete composition.

The acrylic emulsion is 60 to 99% by weight acrylic resin, 0.1 to 20% by weight methyl methacrylate resin, 0.1 to 15% by weight butyl acrylate resin, 0.01 to 7% by weight polyvinyl methyl ether and 0.01 to 7% by weight polyvinylamine Contains% The acrylic emulsion may further comprise 0.01 to 10% by weight of polyethylene glycol monomethacrylate. In addition, the acrylic emulsion may further comprise 0.01 to 10% by weight of an alkyl phenol resin.

The acrylic resin is used to improve the strength and durability of the composition. It is preferable that 60-99 weight% of said acrylic resins are contained in an acrylic emulsion. When the content of the acrylic resin is less than 60% by weight, the strength and durability improvement effect may be reduced, and when the content of the acrylic resin exceeds 99% by weight, the strength and durability improvement effect is excellent but not economical.

The methyl methacrylate (MMA) resin has excellent weather resistance, which is resistant to weather and climate, such as sunlight, thereby suppressing corrosion due to external environmental changes (weather and climate change) and at the same time as a package. It is added to improve adhesion strength and toughness by penetrating and integrating. Methyl methacrylate resin is a colorless transparent liquid, oxidized in the gas state of Tert-Butyl Alcohol (TBA) prepared by using C4 fraction as a raw material to produce methacrylic acid, and then esterified with methanol It can manufacture. Methyl methacrylate resin belongs to the side which is excellent in transparency, weather resistance, coloring property, and very high stability. Methyl methacrylate (MMA) resins are known to have the formula CH ₂ = C (CH ₃ ) CO ₂ CH ₃ . The methyl methacrylate (MMA) resin is preferably contained in an acrylic emulsion of 0.1 to 20% by weight. When the content of the methyl methacrylate (MMA) resin is less than 0.1% by weight may not be good workability, when the content exceeds 20% by weight the viscosity is small, the workability is good but the curing time may be long and the strength may be weakened .

The butyl acrylate resin is also referred to as butyl acrylate, and an ester of acrylic acid and an alcohol (butyl alcohol) is referred to as a monomer (monomer) when it is not a polymer. When polymerized to form a polymer, it becomes an acrylic resin such as a paint or an adhesive. Butyl acrylate resin is used for the synthesis of soft polymers, ethyl, hexyl, etc. may also be used. In addition, since it is well mixed with concrete, sufficient strength can be expressed, and curing time can be shortened even at low temperature or in water, thereby reducing the process time. It is preferable that the said butyl acrylate resin is contained 0.1-15 weight% in an acrylic emulsion. If the content of the butyl acrylate resin is less than 0.1% by weight may not be good workability, if the content exceeds 15% by weight the viscosity is small, the workability is good but the curing time may be long and the strength may be weakened.

The polyvinyl methyl ether is used to impart the hydrophilicity of the acrylic emulsion. It is preferable that 0.01-7 weight% of said polyvinyl methyl ethers are contained in an acryl-type emulsion. If the content of the polyvinyl methyl ether is less than 0.1% by weight, the workability may not be good, and if the content exceeds 7% by weight, the workability is improved but the initial strength may be lowered.

The polyvinylamine is used to impart the viscosity of an acrylic emulsion. It is preferable that 0.01-7 weight% of said polyvinylamines are contained in an acryl-type emulsion. If the content of the polyvinylamine is less than 0.1% by weight, the viscosity improving effect is inferior, and if the content exceeds 7% by weight, the viscosity is high, the workability is lowered and the initial strength may be lowered.

In addition, the acrylic emulsion may further comprise 0.001 to 3% by weight of a water reducing agent. The water reducing agent is preferably a polycarboxylic acid-based water reducing agent, the polycarboxylic acid-based water reducing agent to improve the strength and durability by reducing the water-cement ratio and at the same time to delay the hydration reaction of the cement to improve the initial workability do.

In addition, the acrylic emulsion may further include polyethylene glycol monomethacrylate in order to improve dispersibility. It is preferable that 0.01-10 weight% of said polyethyleneglycol monomethacrylates are contained in the said acrylic emulsion.

In addition, the acrylic emulsion may further include an alkyl phenol resin to improve adhesion and adhesive strength. It is preferable that the said alkyl phenol resin is contained 0.01 to 10 weight% in the said acrylic emulsion.

Modified fast-hard concrete composition using an inorganic binder and an acrylic binder in which sulfur is mixed according to a preferred embodiment of the present invention, the inorganic binder is 4 ~ 35% by weight, fine aggregate 20 ~ 56% by weight, coarse aggregate 25 ~ 56% by weight coarse mixer After stirring for about 1 to 10 minutes, 0.1 to 7% by weight of water and 0.01 to 13% by weight of the acrylic emulsion may be further mixed and stirred for about 1 to 10 minutes.

The acrylic emulsion is 60 to 99% by weight acrylic resin, 0.1 to 20% by weight methyl methacrylate resin, 0.1 to 15% by weight butyl acrylate resin, 0.01 to 7% by weight polyvinyl methyl ether and 0.01 to 7% by weight polyvinylamine Contains%

The inorganic binder is 50 to 99% by weight of crude steel cement, 0.1 to 15% by weight of alumina cement, 0.1 to 15% by weight of calcium sulfoaluminate, 0.1 to 15% by weight of gypsum, 0.1 to 12% by weight of blast furnace slag, and 0.01 to 5 of metakaolin. It includes by weight and 0.01 to 15% by weight sulfur.

On the other hand, the present invention can be used in the aggregate aggregate produced by mixing and stirring sulfur in the wet aggregate aggregate. Due to this process, it is possible to reduce unnecessary equipment use, difficulty of construction, and quality, which are problems in existing field mixing.

The method for producing a fine aggregate, the step of measuring and inputting the wet aggregate in the forced mixer to the forced mixer, the step of heating the sulfur to 110 ~ 130 ℃ softening, and the soft sulfur to 0.1 to 20 parts by weight of the fine aggregate And weighing the weight part, and mixing the wet aggregate and sulfur into the forced mixer to discharge sulfur-coated fine aggregate.

When sulfur is mixed with fine aggregate, the modified fast hard concrete composition may be prepared as follows.

In this case, the modified fast-hard concrete composition is 4 to 35% by weight of inorganic binder, 20 to 56% by weight of the aggregate coated with sulfur, 25 to 56% by weight of coarse aggregate in a forced mixer for 1 to 10 minutes, and then water 0.1-7 weight% and 0.01-13 weight% of acrylic emulsion can be further mixed, and it can manufacture by stirring for about 1 to 10 minutes.

In addition, the present invention, the step of removing the impurities and deterioration site by chipping the site where the concrete structure is deteriorated due to deterioration of the concrete using a crusher and water jet, applying a primer to the deterioration site of the removed concrete, Repairing the concrete structure comprising the step of restoring the cross-section of the deteriorated site by pouring the modified fast-hard concrete composition on the primer, and applying a curing agent to the top of the modified fast-hard concrete composition to provide.

Hereinafter, the concrete structure is used as a meaning including a road, a bridge, a building made of concrete material, in particular used as a meaning including a concrete slab of the bridge, the road surface, the lower portion of the bridge.

The primers are made of styrene butadiene rubber (SBR) latex, poly acryl ester (PAE), acrylic and ethylene vinyl acetate, which facilitate the attachment of the modified fast-hard concrete composition to concrete structures. At least one selected from EVA. At this time, the solid content of the primer is preferably lowered to about 13% by weight. If it is used in excess of 13% by weight, the thickness of the coating may be thick, which may lower the adhesion performance.

Hereinafter, examples of modified fast-hard concrete compositions using the inorganic binder and the acrylic binder incorporating sulfur according to the present invention will be described in more detail, and the present invention is not limited thereto.

≪ Example 1 >

After adding 14% by weight of the inorganic binder, 45% by weight of the aggregate and 38% by weight of the coarse aggregate to the mixer and forcibly stirring, 1% by weight of water and 2% by weight of the acrylic emulsion were further mixed and stirred for 2 minutes to modify the fast-setting concrete composition. Was prepared.

At this time, the inorganic binder is 77% by weight of cement, 5% by weight of alumina cement, 5% by weight of calcium sulfoaluminate, 3% by weight of gypsum, 3% by weight of blast furnace slag, 3% by weight of metakaolin, 3% by weight of sulfur reducing agent. It was used comprising a weight percent and 0.5 weight percent retardant.

The acrylic emulsion was used containing 95% by weight of acrylic resin, 2% by weight of methyl methacrylate resin, 2% by weight of butyl acrylate, 0.5% by weight of polyvinyl methyl ether and 0.5% by weight of polyvinylamine.

The sensitizer and the retardant used a polycarboxylic acid-based sensitizer and citric acid-based retardant.

<Example 2>

After adding 14% by weight of the inorganic binder, 45% by weight of the aggregate and 38% by weight of the coarse aggregate to the mixer and forcibly stirring, 1% by weight of water and 2% by weight of the acrylic emulsion were further mixed and stirred for 2 minutes to modify the fast-setting concrete composition. Was prepared.

At this time, the inorganic binder is 77% by weight of cement, 5% by weight of alumina cement, 5% by weight of calcium sulfoaluminate, 3% by weight of gypsum, 3% by weight of blast furnace slag, 3% by weight of metakaolin, 3% by weight of sulfur reducing agent. It was used comprising a weight percent and 0.5 weight percent retardant.

The acrylic emulsion was used comprising 90% by weight of acrylic resin, 5% by weight of methyl methacrylate resin, 4% by weight of butyl acrylate, 0.5% by weight of polyvinyl methyl ether and 0.5% by weight of polyvinylamine.

The sensitizer and the retardant used a polycarboxylic acid-based sensitizer and citric acid-based retardant.

<Example 3>

After adding 14% by weight of the inorganic binder, 45% by weight of the aggregate and 38% by weight of the coarse aggregate to the mixer and forcibly stirring, 1% by weight of water and 2% by weight of the acrylic emulsion were further mixed and stirred for 2 minutes to modify the fast-setting concrete composition. Was prepared.

At this time, the inorganic binder is 77% by weight of cement, 5% by weight of alumina cement, 5% by weight of calcium sulfoaluminate, 3% by weight of gypsum, 3% by weight of blast furnace slag, 3% by weight of metakaolin, 3% by weight of sulfur reducing agent. It was used comprising a weight percent and 0.5 weight percent retardant.

The acrylic emulsion was used containing 85% by weight acrylic resin, 7% by weight methyl methacrylate resin, 7% by weight butyl acrylate, 0.5% by weight polyvinyl methyl ether and 0.5% by weight polyvinylamine.

The sensitizer and the retardant used a polycarboxylic acid-based sensitizer and citric acid-based retardant.

In order to more easily understand the characteristics of Examples 1 to 3, the following comparative examples are presented, and Comparative Examples 1 and 2 show a cement concrete composition and a polymer cement concrete composition. Comparative Example 1 and Comparative Example 2 are presented to better understand the characteristics of Examples 1 to 3, and do not become a prior art of the present invention.

&Lt; Comparative Example 1 &

12% by weight of crude cement, 45% by weight of fine aggregate, 38% by weight of coarse aggregate, and 5% by weight of water were added to a mixer to prepare a cement concrete composition by forced stirring.

Comparative Example 2

12% by weight of crude cement, 47% by weight of aggregate and 36% by weight of coarse aggregate were added to the mixer forcibly stirring, and then 1% by weight of water, 2% by weight of acrylic resin and 2% by weight of sulfur were further mixed and stirred for 2 minutes. A polymer cement concrete composition was prepared.

The following test examples are compared with the properties of the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 to more easily understand the properties of the modified fast-hard concrete composition prepared according to Examples 1 to 3 It is shown.

&Lt; Test Example 1 >

The slump test (degree of dough) of the modified fast-hard concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 according to the method specified in KS F 2402 It is shown. The slump test is to test the toughness of the dough, such as the age and consistency of the concrete, the higher the value means the workability (workability), that is, excellent workability when pouring concrete.

Table 1 below shows the change of slump over time.

division Slump (cm) Just after stirring After 20 minutes After 30 minutes After 40 minutes After 60 minutes Example 1 20 17 13 11 9 Example 2 20 17 14 12 10 Example 3 20 18 15 13 12 Comparative Example 1 13 9 6 4 3 Comparative Example 2 19 14 10 8 5

As shown in Table 1, the modified fast-hard concrete composition prepared according to Examples 1 to 3 was excellent in workability compared to the concrete composition prepared according to Comparative Example 1 and Comparative Example 2.

&Lt; Test Example 2 &

The results of the compressive strength test of the modified fast-hard concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 according to the method specified in KS F 2405.

Table 2 below shows the change in compressive strength over time.

division Compressive strength (kgf / ㎠) After 3 hours 12 hours later 24 hours later 3 days later 28 days later Example 1 308 359 395 459 498 Example 2 319 367 405 471 515 Example 3 326 385 416 488 528 Comparative Example 1 195 225 255 326 407 Comparative Example 2 235 278 318 364 436

As shown in Table 2, the modified fast-hard concrete composition prepared according to Examples 1 to 3 was significantly higher than the concrete composition prepared according to Comparative Example 1 and Comparative Example 2.

<Test Example 3>

The modified fast-hard concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 shows the result of measuring the bending strength according to the method specified in KS F 2408.

Table 3 below shows the changes in flexural strength over time.

division Flexural strength (kgf / ㎠) After 3 hours 12 hours later 24 hours later 3 days later 28 days later Example 1 68 79 86 90 98 Example 2 69 84 91 94 103 Example 3 71 87 93 97 110 Comparative Example 1 35 38 42 50 62 Comparative Example 2 45 52 60 70 82

As shown in Table 3, the modified fast-hard concrete composition prepared according to Examples 1 to 3 is cured after 12 hours after construction to generate a resistance to external load does not cause deformation of the concrete . In particular, after 28 days of fully cured concrete, the modified fast-rigid concrete composition prepared according to Examples 1 to 3 had significantly higher flexural strength than the concrete compositions prepared according to Comparative Examples 1 and 2.

<Test Example 4>

The results of measuring the tensile strength of the modified fast-hard concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 according to the method specified in KS F 2423.

Table 4 below shows the change in tensile strength over time.

division Tensile strength (kgf / cm2) After 3 hours 12 hours later 24 hours later 3 days later 28 days later Example 1 38 49 52 60 68 Example 2 39 54 59 64 71 Example 3 41 57 61 67 74 Comparative Example 1 15 18 22 30 42 Comparative Example 2 25 32 38 45 56

As shown in Table 4, the modified fast-hard concrete composition prepared according to Examples 1 to 3 was significantly higher in tensile strength than the concrete composition prepared according to Comparative Examples 1 and 2.

&Lt; Test Example 5 >

Adhesion strength was measured according to the method defined in KS F 2762 for the modified fast-curing composition prepared according to Examples 1 to 3 and the concrete composition prepared in Comparative Examples 1 to 2, and the results are shown in Table 5 is shown.

division Adhesive strength (kgf / ㎠) After 3 hours 12 hours later 24 hours later 3 days later 28 days later Example 1 15 17 19 21 23 Example 2 16 18 21 22 24 Example 3 18 20 22 24 26 Comparative Example 1 8 11 13 15 18 Comparative Example 2 10 12 15 17 20

As shown in Table 5, the modified fast-hard concrete composition prepared according to Examples 1 to 3 was significantly higher than the concrete composition prepared according to Comparative Example 1 and Comparative Example 2.

<Test Example 6>

The modified fast-hardening crete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 shows the measurement results of the water absorption according to the method specified in KS F 4004 (cement brick) will be. If the absorption rate is high, if the impurities or water penetrates into the concrete, the porosity increases in the concrete, causing a problem of damage to the structure. That is, the lower the absorptivity is that the strength of the concrete is improved after curing.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Absorption rate (%) 0.5 0.5 0.4 5 1.0

As shown in Table 6 above, modified fast-hard concrete composition prepared according to Examples 1 to 3 has a lower absorption rate than the concrete composition prepared according to Comparative Example 1 and Comparative Example 2.

<Test Example 7>

It shows the measurement results of the freeze-thaw resistance test according to the method specified in KS F 2456 for the modified fast-hardening crete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Examples 1 and 2 . Freeze thaw refers to the freezing and melting of the moisture absorbed by the concrete, and when the freeze thaw is repeated, fine cracks are generated in the concrete structure, resulting in a problem of deterioration in durability.

Table 7 shows the durability index of each of the examples and comparative examples according to the freeze thaw resistance test.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Durability index 95 96 97 48 90

As shown in Table 7, the modified fast-hard concrete composition prepared according to Examples 1 to 3 is significantly higher durability index than the concrete composition prepared according to Comparative Example 1 and Comparative Example 2, the durability is improved It can be seen that.

<Test Example 8>

The dry shrinkage of the modified fast-hardening crete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 was measured by KS F 2424 (test method for changing the length of concrete). The results are shown in Table 8 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Dry Shrinkage (× 10 ^-4 ) 0.52 0.5 0.38 33 1.0

As shown in Table 8, the modified fast-hard concrete composition prepared according to Examples 1 to 3 has a reduced shrinkage effect by reducing the amount of dry shrinkage compared to the concrete composition prepared according to Comparative Examples 1 and 2 Could confirm.

<Test Example 9>

The modified fast-hardening crete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 were subjected to a test according to JIS A 1171 (test method of polymer cement mortar), The results are shown in Table 9.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Neutralization Depth (mm) 0.2 0.1 0.1 2.9 0.8

As shown in Table 9 above, the modified fast-hard concrete composition prepared according to Examples 1 to 3 has a smaller neutralization penetration depth compared to the concrete compositions prepared according to Comparative Examples 1 and 2, the resistance to neutralization It was confirmed that this is high.

<Test Example 10>

Modified fast-hard concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 was tested by JIS A 1171, the results are shown in Table 10 below. .

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Chloride ions
Penetration depth (mm) 0.5 0.5 0.4 48 1.0

As shown in Table 10 above, the modified fast-hard concrete composition prepared according to Examples 1 to 3 has less chloride ion penetration depth compared to the concrete compositions prepared according to Comparative Example 1 and Comparative Example 2 to the salt It was confirmed that the resistance is high.

As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various deformation | transformation by a person of ordinary skill in the art within the scope of the technical idea of this invention is carried out. This is possible.

Claims (8)

4 to 35% by weight of inorganic binder, 20 to 56% by weight of fine aggregate, 25 to 56% by weight of coarse aggregate, 0.1 to 7% by weight of water and 0.01 to 13% by weight of acrylic emulsion,
The inorganic binder is 50 to 99% by weight of crude steel cement, 0.1 to 15% by weight of alumina cement, 0.1 to 15% by weight of calcium sulfoaluminate, 0.1 to 15% by weight of gypsum, 0.1 to 12% by weight of blast furnace slag, and 0.01 to 5 of metakaolin. It comprises by weight and 0.01 to 15% by weight sulfur,
The acrylic emulsion is 60 to 99% by weight acrylic resin, 0.1 to 20% by weight methyl methacrylate resin, 0.1 to 15% by weight butyl acrylate resin, 0.01 to 7% by weight polyvinyl methyl ether and 0.01 to 7% by weight polyvinylamine Modified fast-hard concrete composition using an inorganic binder and an acrylic emulsion incorporating sulfur, characterized in that it comprises%.
The method of claim 1, wherein the acrylic emulsion further comprises 0.01 to 10% by weight of polyethylene glycol monomethacrylate, modified fast-hardening concrete composition using an inorganic binder and an acrylic emulsion incorporating sulfur.
The method of claim 1, wherein the acrylic emulsion further comprises 0.01 to 10% by weight of an alkyl phenolic resin modified fast-hardening concrete composition using an inorganic binder and an acrylic emulsion incorporating sulfur.
The method of claim 1, wherein the inorganic binder further comprises 0.001 to 3% by weight of a retarder for maintaining the workability of the modified fast-hard concrete composition, the modified binder using the sulfur-based inorganic binder and acrylic emulsion. Hard concrete composition.
According to claim 1, wherein the inorganic binder is modified quick-hard concrete composition using an inorganic binder and an acrylic emulsion incorporating sulfur, characterized in that it further comprises 0.001 to 3% by weight of a water reducing agent for reducing the water-cement ratio.
delete Deteriorating the concrete structure and chipping the site where the concrete is dropped by using a crusher and a water jet to remove impurities and deterioration sites;
Applying a primer to the deteriorated portion of concrete to facilitate attachment of the modified fast-hard concrete composition of claim 1 to the concrete structure;
Restoring a cross section of the deteriorated site by pouring the modified fast-hard concrete composition of claim 1 on top of the applied primer; And
And applying a curing agent on top to the poured rapid hard concrete composition,
The primer is a repair method for a concrete structure, characterized in that made of one or more materials selected from styrene butadiene rubber latex, poly acrylic ester, acrylic and ethylene vinyl acetate. delete