KR101514741B1 - Cement concrete composition and manufacture method of concrete block using the said - Google Patents

Abstract

The present invention relates to a cement concrete composition with high strength and durability and a method for manufacturing a concrete block using the same and, more specifically, to a concrete composition with high strength and durability composed of: 0.01 to 15 wt% of special admixture, 3 to 30 wt% of inorganic binding material, 20 to 60 wt% of fine aggregate, 15 to 50 wt% of coarse aggregate, and 0.1 to 10 wt% of water and to a method for manufacturing a concrete block using the same so that the composition′s bending, tensile, attachment strength, and durability can be improved by reducing the ratio of water to cement.

Description

TECHNICAL FIELD The present invention relates to a high strength and high durability cement concrete composition and a method of manufacturing a concrete block using the same.

The present invention relates to a high strength and high durability cement concrete composition having high strength and durability, and a method for producing a concrete block using the same.

Concrete structures In particular, after a period of time that cracks have occurred in concrete due to deterioration in the lower part of the bridge, on the road surface, in the sidewall, in the sewer culvert, in the central separation wall, in the sewer pipe, in the manhole, in the manhole, in the concrete slab, The tensile strength of the reinforced concrete is gradually lowered, and the concrete exposed through the cracked portion is subjected to neutralization and corrosion of the reinforcing steel occurs. If these rebar corrosion phenomena become severe, the concrete structure may eventually collapse. Therefore, if the concrete structure deteriorates and cracks are generated, it is necessary to repair the deteriorated part quickly.

When the concrete structure is exposed to the marine environment periodically and in the long term, chloride ion (Cl ^- ) present in the seawater penetrates directly into the concrete and its penetration value is increased to the allowable value (amount of critical corrosion chloride, about 1.2 kg / m ³ ) , The corrosion of the reinforcing steel due to the electrochemical action causes cracking of the coated concrete. Reinforced reinforced concrete (RC), which is normally placed in a sound reinforced concrete structure, forms a surface coating (1 ㅧ 10-6 mm thick) by Ca (OH) ₂ of pH 12.5 contained in concrete, If anions such as Cl ^- , F ^- , S ^{2 -} SO ₄ ^2- present in the seawater component penetrate or remain at high temperature, the passive film on the surface of the steel is partially broken and corrosion begins. Especially, chloride ion (Cl ^- ) is known as the most harmful component to steel corrosion.

The present invention can exhibit excellent properties by mixing an admixture excellent in acid resistance and salt resistance and can improve warping, tensile, adhesion strength and durability by lowering the water-cement ratio by incorporating a special admixture, It is useful in terms of recycling industrial wastes by using highly durable silica-silica admixture. It can effectively reduce the water / cement ratio (W / C) even by adding a small amount of special admixture, And a durability improving effect, and a concrete block manufacturing method using the cement concrete composition.

The present invention relates to a process for producing a polyurethane foam comprising 0.01 to 15% by weight of a special admixture comprising polystyrene, polyisobutylene, butyl acrylate, polybutadiene, methyl polyacrylate, water reducing agent and defoamer, 3 to 35% by weight of inorganic binder, 20 to 60% 15 to 50% by weight of coarse aggregate and 0.1 to 10% by weight of water.

Wherein the polystyrene is contained in an amount of 20 to 98% by weight with respect to the special admixture, the polyisobutylene is 1 to 25% by weight with respect to the special admixture, the butyl acrylate with the special admixture is 0.1 to 25% Is 0.1 to 20% by weight with respect to the special admixture, 0.01 to 20% by weight with respect to the special admixture, the water reducing agent is 0.01 to 20% by weight with respect to the special admixture, and the defoamer is 0.01 to 20% 10% by weight.

The inorganic binder is usually 20 to 50% by weight of Portland cement, 15 to 45% by weight of blast furnace slag, 1 to 15% by weight of fly ash, 1 to 15% by weight of silica fume, 1 to 15% by weight of anhydrous gypsum, And 0.01 to 15% by weight of tricalcium aluminate.

And 0.1 to 7% by weight of an inorganic pigment to the inorganic binder, wherein the inorganic pigment is at least one material selected from titanium oxide, red iron oxide, yellow iron oxide, chromium oxide (CrO ₃ ), purple iron oxide and black iron oxide.

The inorganic binder may further include a water reducing agent, and the water reducing agent may be contained in an amount of 0.01 to 5% by weight based on the inorganic binder.

The present invention relates to a method for dry production of a concrete block, comprising the steps of assembling a concrete block mold, placing the assembled mold in a hydraulic compactor, casting the high strength and high durability cement concrete composition, A method of manufacturing a cement concrete composition, comprising the steps of: pressurizing a durable cement concrete composition with hydraulic pressure while vibrating; curing the formed high strength and high durability cement concrete composition; and demolding the cured high strength and high durability cement concrete composition in a mold .

The present invention relates to a method for producing a concrete block, comprising the steps of assembling the concrete block mold, placing the assembled mold in a hydraulic compactor, casting the high strength and high durability cement concrete composition, Damping the durable cement concrete composition with vibration, curing the molded high strength and high durability cement concrete composition, and demolding the cured high strength and high durability cement concrete composition in the formwork.

According to the high-strength and high-durability cement concrete composition of the present invention and the concrete block manufacturing method using the same, it is possible to reduce the water-cement ratio by mixing a special admixture to improve the flexure, tensile strength, bond strength and durability of the composition.

According to the high strength and high durability cement concrete composition of the present invention and the concrete block manufacturing method using the same, more than 50% of the inorganic binders are used as industrial waste materials, which is useful in terms of recycling industrial wastes. Hardening time, workability, strength, ductility, and durability.

According to the high-strength and high-durability cement concrete composition of the present invention and the concrete block manufacturing method using the same, even when a small amount of special admixture is added by using the silica-alumina admixture in an amount of 50% or more of the inorganic binder, the water / cement (W / C) Thereby improving the strength development and durability of the cement concrete composition.

According to the high-strength and high-durability cement concrete composition of the present invention and the concrete block manufacturing method using the same, the blast furnace slag, fly ash, and calcium aluminate can be used instead of cement.

Hereinafter, preferred embodiments according to the present invention will be described in detail. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

The high strength and high durability cement concrete composition of the present invention includes special admixture, inorganic binder, fine aggregate, coarse aggregate and water.

The special admixture is contained in an amount of 0.01 to 15% by weight based on the high-strength and high-durability cement concrete composition, the inorganic binder is contained in an amount of 3 to 35% by weight with respect to the high-strength and high-durability cement concrete composition, The cement composition according to claim 1, wherein the high-strength and high-durability cement concrete composition comprises 20 to 60% by weight of the high-strength and high-durability cement concrete composition, and the coarse aggregate contains 15 to 50% To 10% by weight.

The aggregate is classified into a fine aggregate and a fine aggregate. Particles having a particle diameter of 5 mm or less are referred to as fine aggregate, and those having a particle diameter larger than 5 mm are classified into coarse aggregate. The fine aggregate is preferably contained in an amount of 20 to 60% by weight based on the high-strength and high-durability cement concrete composition, and the coarse aggregate is preferably contained in the high-strength and high-durability cement concrete composition in an amount of 15 to 50% by weight.

It is preferable that the special admixture is contained in 0.01 to 15% by weight of the high-strength and high-durability cement concrete composition. When the content of the special admixture exceeds 15% by weight in the high-strength and high- The viscosity of the concrete composition is lowered so that the material is separated and the hydration reaction is delayed to lower the early compression strength and the price competitiveness is lowered. If the content of the special admixture is less than 0.01% by weight based on the high-strength and high-durability cement concrete composition, the strength and durability are lowered.

The special admixture has properties that can improve curing time, workability, ductility, strength and durability of a high strength and high durability cement concrete composition. The special admixture according to a preferred embodiment of the present invention includes polystyrene, polyisobutylene, butyl acrylate, polybutadiene, methyl polyacrylate, a water reducing agent and a defoaming agent.

The polystyrene is contained in an amount of 20 to 98% by weight with respect to the special admixture, the polyisobutylene is contained in an amount of 1 to 25% by weight with respect to the special admixture, and the butyl acrylate is contained with 0.1 to 25% by weight with respect to the special admixture , The polybutadiene is contained in an amount of 0.1 to 20 wt% relative to the special admixture, the poly (methyl acrylate) is contained in an amount of 0.01 to 20 wt% with respect to the special admixture, the water reducing agent is contained in an amount of 0.01 to 20 wt% Is preferably contained in an amount of 0.01 to 10% by weight with respect to the special admixture.

The polystyrene is used as an adhesive binding agent, and exhibits excellent performance as well as performance as an adhesive when mixed with aggregates including cement, thereby exhibiting high performance in performance and improving durability and preventing cricking. In particular, it increases the adhesive strength and fracture strength after curing, increases the strength of cement, prevents detachment of high strength and high durability cement concrete composition after injection, and improves durability. The polystyrene is preferably contained in an amount of 20 to 98% by weight with respect to the special admixture.

The polyisobutylene is used for improving workability, strength and durability. The polyisobutylene is preferably contained in an amount of 1 to 25% by weight with respect to the special admixture. If the content of the polyisobutylene exceeds 25% by weight, the initial strength development is delayed. If the content is less than 0.1%, the effect of improving the strength and durability is insufficient.

The butyl acrylate is used not only to maintain the workability by lowering the viscosity of the high strength and high durability cement concrete composition but also to improve the ductility. If the butyl acrylate content exceeds 25% by weight, the viscosity of the high-strength and high-durability cement concrete composition may be lowered and the material may be separated from the composition. If the content of the butylacrylate resin is less than 0.1% by weight, the workability of the high-strength and high-durability cement concrete composition is improved but the strength of the boundary stone is lowered.

When the polybutadiene is included, the viscosity of the high-strength and high-durability cement concrete composition increases, so that workability is improved, and strength and durability are improved. The polybutadiene is preferably contained in an amount of 0.1 to 20% by weight with respect to the special admixture. If the content of the polybutadiene exceeds 20% by weight, the viscosity of the high-strength and high-durability cement concrete composition is lowered to improve workability, but the early strength development and durability deteriorate. If the content is less than 0.1% by weight, The strength and durability improvement effect is weak.

The poly (methyl acrylate) can improve the strength by reducing the water (W) - cement ratio (C / W) ratio by mixing with the high strength and high durability cement concrete composition. The content of methyl polyacrylate is preferably 0.01 to 20% by weight based on the special admixture. When the content of methyl polyacrylate exceeds 20% by weight, viscosity increases and workability is lowered, initial strength development is lowered, If the content of methyl acrylate is less than 0.01% by weight, the effect of improving the strength and endurance performance is insufficient.

The water reducing agent improves the strength and durability by reducing the water-cement ratio of the high-strength and high-durability cement concrete composition. Examples of the water reducing agent include a polycarbonate-based, melamine-based, naphthalene-based, and the like. The melamine-based or naphthalene-based water reducing agent is less effective in improving the strength and durability than the polycarboxylic acid-based water reducing agent and has a small water- And the compatibility with the polymer is poor. Therefore, it is preferable to use a polycarboxylic acid-based water reducing agent for the high strength and high durability cement concrete composition of the present invention. The water reducing agent is preferably contained in an amount of 0.01 to 20% by weight with respect to the special admixture.

The antifoaming agent is added to reduce an increase in the amount of air due to the generation of entrained air in the high strength and high durability cement concrete composition. The antifoaming agent is preferably used in the form of an alcohol type antifoaming agent, a silicone type antifoaming agent, a fatty acid type antifoaming agent, an oil type antifoaming agent, Based antifoaming agents, and the like can be used alone or in combination, but the present invention is not limited thereto, and a kind commonly used in the art may be used. Examples of the silicone defoaming agent include dimethyl silicone oil, polyorganosiloxane, and fluorosilicone oil. Examples of the fatty acid defoaming agent include stearic acid and oleic acid. As the oil defoamer, kerosene, animal or plant oil, castor oil, etc. may be used. As the ester type antifoaming agent, solitol trioleate, glycerol monoricinolate and the like can be used. Examples of the oxyalkylene antifoaming agents include polyoxyalkylene, acetylene ethers, polyoxyalkylene dihalogen esters, polyoxyalkylene alkylamines, and the like. As the alcohol defoaming agent, glycol or the like may be used. The defoaming agent is preferably contained in an amount of 0.01 to 10% by weight with respect to the special admixture.

It is preferable that the inorganic binder is contained in 3 to 35% by weight of the high-strength and high-durability cement concrete composition. When the content of the inorganic binder exceeds 35% by weight in the high-strength and high-durability cement concrete composition, If the content of the inorganic binder is less than 3% by weight based on the high strength and high durability cement concrete composition, the drying shrinkage is small, but the strength and durability may be lowered.

The inorganic binder is usually 20 to 50% by weight of Portland cement, 15 to 45% by weight of blast furnace slag, 1 to 15% by weight of fly ash, 1 to 15% by weight of silica fume, 1 to 15% by weight of anhydrous gypsum, And 0.01 to 15% by weight of tricalcium aluminate.

It is preferable to use the ordinary Portland cement specified in KS.

The blast furnace slag is used to improve latent hydraulic characteristics, long-term strength development and durability. When the weight ratio is increased, initial strength is lowered, but long-term strength development and durability are increased. The blast furnace slag is preferably contained in an amount of 15 to 45% by weight based on the inorganic binder. If the content of the blast furnace slag is less than 15% by weight, the initial strength of the composition may be exhibited but the long-term strength and durability may be deteriorated. When the blast furnace slag content exceeds 45% by weight, Lt; / RTI > but may delay the expression of the initial intensity.

The fly ash is used for improving latent hydraulic characteristics, long-term strength development and durability. When the weight ratio of fly ash is increased, initial strength is lowered, but long-term strength development and durability are increased. The fly ash is preferably contained in an amount of 1 to 15% by weight based on the inorganic binder. If the content of the fly ash is less than 1% by weight, the initial strength of the composition may be exhibited, but the long-term strength and durability may be deteriorated. When the content of the fly ash exceeds 15% by weight, Can be improved, but the initial intensity expression can be delayed.

The silica fume is used for improving latent hydraulic characteristics, long-term strength development and durability. When the weight ratio of the silica fume is increased, the initial strength is lowered, but the long-term strength development and durability are increased. The silica fume is preferably contained in an amount of 1 to 15% by weight based on the inorganic binder. If the content of the silica fume is less than 1% by weight, the initial strength of the composition may be exhibited but the long-term strength and durability may be deteriorated. If the content of the silica fume exceeds 15% by weight, the workability and long- However, the initial intensity expression can be delayed.

The anhydrous gypsum (CaSO ₄ ) reacts with the components in the cement, in particular C ₃ A ( ₃ CaO ㅇ Al ₂ O ₃ ) to initially produce ettringite (AFt phase, C ₃ A ₃ Ca ₄ O ₄ 32 H ₂ O) As a result, the amount of etrinzite produced decreases with the progress of hydration, or a part thereof is transferred to monosulfate (AFm phase, C ₃ A ₅ CaSO _{4 12} H ₂ O). When a large amount of gypsum is added as in the present invention, etrinzite is sufficiently generated from the beginning to densify the structure of the cement, thereby increasing penetration resistance to chloride ions in the early age. The anhydrous gypsum is preferably contained in the inorganic binder in an amount of 1 to 15% by weight. If the content of the gypsum anhydride is less than 1% by weight, the initial formation of etchinite is reduced and the formation of dense texture is difficult. When the content of the gypsum exceeds 15% by weight, good physical properties are obtained due to quick curing property, .

The mica is in the form of a flake, and serves as a shield to prevent penetration of chlorine ions or water. The mica is preferably contained in the inorganic binder in an amount of 1 to 15% by weight. When the content of the mica is less than 1% by weight, it is difficult to form a dense structure of the high strength and high durability cement concrete composition. When the content of the mica exceeds 15% by weight, the hydration reaction decreases and the strength decreases.

The above-mentioned tricalcium aluminate (3CaO.Al ₂ O ₃ ) is used to prevent shrinkage. It is preferable that the above-mentioned three calcium aluminates (3CaO.Al ₂ O ₃ ) is contained in the inorganic binder in an amount of 0.01 to 15% by weight. The aluminate 3 calcium (3CaO · Al ₂ O ₃₎ This has the effect that if suppressing the shrinkage is less than 0.01% by weight to slight amount of, the amount of the aluminate 3 calcium _{(3CaO · Al 2 O 3)} 15 wt. %, The workability may be deteriorated.

The inorganic binder of the present invention may further contain 0.1 to 7% by weight of an inorganic pigment. When the inorganic pigment is contained, it is more preferable from the standpoint of stably expressing a desired color. The inorganic pigment may be at least one selected from the group consisting of titanium oxide, red iron oxide, yellow iron oxide, chromium oxide (Cr ₂ O ₃ ), purple iron oxide and black iron oxide (carbon black) , Black, blue, and white.

The inorganic binder may further include a water reducing agent, and the water reducing agent may be contained in an amount of 0.01 to 5% by weight based on the inorganic binder.

The high strength and high durability cement concrete composition according to the embodiment of the present invention is for producing a concrete block.

The high strength and high durability cement concrete composition according to a preferred embodiment of the present invention can be manufactured by the following method.

Inorganic binder, fine aggregate and coarse aggregate are mixed at a certain ratio and stirred in a forced mixer. The inorganic binder is mixed with 3 to 35% by weight of the high-strength and high-durability cement concrete composition and the fine aggregate is mixed with 20 to 60% by weight of the high-strength and high-durability cement concrete composition so that the coarse aggregate has high strength It is preferable to mix the high-durability cement concrete composition so as to contain 15 to 50 wt%.

The mixture of inorganic binder, fine aggregate and coarse aggregate is further mixed with water and special admixture at a predetermined ratio and stirred for 1 to 10 minutes. It is preferable that the special admixture is mixed with 0.01 to 15% by weight of the high-strength and high-durability cement concrete composition and the water is mixed with 0.1 to 10% by weight of the high-strength and high-durability cement concrete composition.

Hereinafter, a method of manufacturing a concrete block using a high strength and high durability cement concrete composition according to a preferred embodiment of the present invention will be described.

In addition, the method of producing the concrete block of the present invention includes a dry and a wet method. The present invention also provides a method of dry-making a concrete block, comprising the steps of: assembling a concrete block form, placing the assembled form on a hydraulic compactor, placing the high-strength and highly durable cement concrete composition, A step of curing the high strength and high durability cement concrete composition by hydraulic pressure while vibrating, a step of curing the molded high strength and high durability cement concrete composition, a step of demolding the cured high strength and high durability cement concrete composition in the formwork The present invention provides a method for manufacturing a dry concrete block.

According to another aspect of the present invention, there is provided a method of producing a wet concrete block, comprising the steps of: assembling a concrete block form; placing the assembled form on a hydraulic type compaction machine; placing the high strength and high durability cement concrete composition; A step of forming a high strength and high durability cement concrete composition by vibration, a step of curing the formed high strength and high durability cement concrete composition, and a step of demolding the cured high strength and high durability cement concrete composition in a mold The present invention provides a method for producing a wet concrete block.

The concrete block refers to a sidewalk block, an interlocking block, a reinforced soil block, a retaining wall block, and the like.

Hereinafter, embodiments of the high-strength and high-durability cement concrete composition according to the present invention will be more specifically shown and the present invention is not limited by the following embodiments.

≪ Example 1 >

18 wt% of inorganic binder, 40 wt% of fine aggregate, and 35 wt% of coarse aggregate were mixed and stirred in a forced mixer. Then, 3 wt% of water and 4 wt% of special admixture were further mixed and stirred for 2 to 3 minutes to obtain high strength and high durability Cement concrete composition was prepared.

The inorganic binder is usually prepared by mixing 45 wt% of Portland cement, 30 wt% of blast furnace slag, 10 wt% of fly ash, 5 wt% of silica fume, 7 wt% of anhydrous gypsum, 2 wt% of mica and 1 wt% of calcium aluminate Respectively.

The special admixture was mixed at a ratio of 95 wt% of polystyrene, 1 wt% of polyisobutylene, 1 wt% of butyl acrylate, 1 wt% of polybutadiene, 1 wt% of poly methyl acrylate, 0.5 wt% of water reducing agent and 0.5 wt% Respectively.

A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

The defoamer was a silicone defoamer.

≪ Example 2 >

18 wt% of inorganic binder, 40 wt% of fine aggregate, and 35 wt% of coarse aggregate were mixed and stirred in a forced mixer. Then, 3 wt% of water and 4 wt% of special admixture were further mixed and stirred for 2 to 3 minutes to obtain high strength and high durability Cement concrete composition was prepared.

The inorganic binder is usually prepared by mixing 45 wt% of Portland cement, 30 wt% of blast furnace slag, 10 wt% of fly ash, 5 wt% of silica fume, 7 wt% of anhydrous gypsum, 2 wt% of mica and 1 wt% of calcium aluminate Respectively.

The special admixture was mixed at a ratio of 90 wt% of polystyrene, 3 wt% of polyisobutylene, 2 wt% of butyl acrylate, 2 wt% of polybutadiene, 2 wt% of poly methyl acrylate, 0.5 wt% of water reducing agent and 0.5 wt% Respectively.

A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

The defoamer was a silicone defoamer.

≪ Example 3 >

15 wt% of inorganic binder, 40 wt% of fine aggregate, and 38 wt% of coarse aggregate were mixed and stirred in a forced mixer. Then, 3 wt% of water and 4 wt% of special admixture were further mixed and stirred for 2 to 3 minutes to obtain high strength and high durability Cement concrete composition was prepared.

The inorganic binder is usually prepared by mixing 45 wt% of Portland cement, 30 wt% of blast furnace slag, 10 wt% of fly ash, 5 wt% of silica fume, 7 wt% of anhydrous gypsum, 2 wt% of mica and 1 wt% of calcium aluminate Respectively.

The special admixture was mixed at a ratio of 85 wt% of polystyrene, 5 wt% of polyisobutylene, 3 wt% of butyl acrylate, 3 wt% of polybutadiene, 3 wt% of poly methyl acrylate, 0.5 wt% of water reducing agent and 0.5 wt% Respectively.

A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

The defoamer was a silicone defoamer.

In order to compare the physical properties of the high-strength and high-durability cement concrete compositions prepared according to the above-described Examples 1 to 3, the presently widely used ordinary cement concrete composition and polymer cement concrete composition were compared with Comparative Example 1 and Comparative Example 2 .

≪ Comparative Example 1 &

18% by weight of Portland cement, 40% by weight of fine aggregate, and 35% by weight of coarse aggregate were mixed in a forced mixer. Then, 7% by weight of water was further mixed and stirred for 2 to 3 minutes to prepare a concrete composition.

≪ Comparative Example 2 &

The mixture was stirred in a forced mixer with 18 wt% of Portland cement, 40 wt% of fine aggregate, and 35 wt% of coarse aggregate. Then, 3 wt% of water and 4 wt% of polystyrene were further mixed and stirred for 2 to 3 minutes to obtain a polymer cement concrete composition .

Hereinafter, the test results for comparing and evaluating the physical properties of the high-strength and high-durability cement concrete composition prepared according to Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Examples 1 and 2 will be described .

≪ Test Example 1 >

Table 1 below shows the results of testing the strengths of the high strength and high durability cement concrete compositions prepared according to Examples 1 to 3 of the present invention and the cement concrete compositions prepared according to Comparative Examples 1 and 2.

Tests were conducted in accordance with the standards of KS F 2405 (Method for testing compressive strength of concrete), KS F 2408 (Method for testing flexural strength of concrete), and KS F 2423 (Method for testing tensile strength of concrete).

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 burglar
(kgf / cm2) warp 79 88 90 48 62 compression 485 535 571 405 425 Seal 40 45 47 28 35

Compression and tensile strength of the compositions prepared according to the present invention (Examples 1, 2 and 3) were higher than those of the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2 Respectively.

That is, it can be confirmed that the high strength and high durability cement concrete composition produced according to the present invention is much superior in strength to the cement concrete composition prepared according to Comparative Example 1 and Comparative Example.

≪ Test Example 2 &

The high strength and high durability cement concrete compositions prepared according to Examples 1 to 3 according to the present invention and the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2 were tested for KS F 2424 The results are shown in Table 2 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Length change rate (%) 0.04 0.03 0.02 0.1 0.07

As shown in Table 2, the high-strength and high-durability cement concrete composition prepared according to Examples 1 to 3 according to the present invention had a reduced shrinkage of shrinkage compared to the cement concrete compositions prepared according to Comparative Examples 1 and 2 Shrinkage reduction effect was confirmed.

≪ Test Example 3 >

The following Table 3 shows the results of the evaluation of the high strength and high durability cement concrete compositions prepared according to Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2 according to KS F 2456 The measurement results of the freeze-thaw resistance test according to one method are shown.

Freezing and thawing means that the water absorbed in the concrete is frozen and melted. When freezing and thawing is repeated, fine cracks are generated in the concrete structure, and the durability is lowered.

Table 3 below shows durability indices of the respective 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 92 94 96 54 89

As shown in Table 3, the durability index of the high strength and high durability cement concrete composition prepared according to Examples 1 to 3 according to the present invention is much higher than that of the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2 Therefore, it can be seen that the durability is improved.

<Test Example 4>

The high strength and high durability cement concrete compositions prepared according to Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2 were evaluated by the method defined in JIS A 1171 (Test Method of Polymer Cement Mortar) The measurement results of the absorption rate are shown in Table 4 below. If the water absorption rate is high, if the impurities or water penetrate into the concrete, the porosity increases in the interior of the concrete, thereby causing a problem of causing damage to the structure.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Absorption Rate (%) 0.4 0.25 0.15 2.2 0.8

As shown in Table 4, the high strength and high durability cement concrete compositions prepared according to Examples 1 to 3 had a lower water absorption rate than the cement concrete compositions prepared according to Comparative Examples 1 and 2.

&Lt; Test Example 5 >

The high strength and high durability cement concrete compositions prepared according to Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2 were tested by JIS A 1171 (Test Method of Polymer Cement Mortar) And the results are shown in Table 5 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Chloride ion penetration depth (mm) 0.7 0.5 0.2 3.0 1.1

As shown in Table 5 above, according to Examples 1 to 3, the high strength and high durability cement concrete composition had less chloride ion penetration depth than the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2, And the resistance was high.

&Lt; Test Example 6 >

According to the above-described Examples 1, 2 and 3, the high strength and high durability cement concrete composition and the test specimens of Comparative Example 1 and Comparative Example 2 were measured for the neutralization penetration depth according to the method specified in JIS A 1171 Are shown in Table 6.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Neutralization depth (mm) 0.3 0.2 0.1 1.0 0.7

As shown in Table 6 above, it was confirmed that the high strength and high durability cement concrete compositions according to Examples 1, 2, and 3 have lower neutralization penetration depth than the comparative examples, and thus are highly resistant to neutralization.

&Lt; Test Example 7 >

According to the above-described Examples 1, 2 and 3, the high strength and high durability cement concrete composition and the test specimens of Comparative Example 1 and Comparative Example 2 were tested according to the Japanese Industrial Standard specification [test method for chemical resistance by immersion of concrete in solution ], The aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide was immersed in the test solution for 28 days, and the measurement results of the chemical resistance test are shown in Table 7.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Chemical resistance
(Weight change rate, mm) Hydrochloric acid -0.4 -0.3 -0.2 -2.5 -0.7 Sulfuric acid -0.2 -0.1 -0.05 -1.9 -0.5 Sodium hydroxide 0.1 0.15 0.21 -0.2 0

As shown in Table 7, it was confirmed that the high-strength and high-durability cement concrete compositions according to Examples 1, 2 and 3 showed lower weight change rate after the chemical resistance test than the comparative examples, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.

Claims (7)

0.01 to 15% by weight of a special admixture including polystyrene, polyisobutylene, butyl acrylate, polybutadiene, methyl polyacrylate, water reducing agent and antifoaming agent, 3 to 35% by weight of inorganic binder, 20 to 60% by weight of fine aggregate, To 50 wt% of water and 0.1 to 10 wt% of water, wherein the polystyrene is contained in an amount of 20 to 98 wt% based on the special admixture, the polyisobutylene is contained in an amount of 1 to 25 wt% Acrylate is 0.1 to 25% by weight with respect to the special admixture, the polybutadiene is 0.1 to 20% by weight with respect to the special admixture, the poly (methyl acrylate) is 0.01 to 20% by weight with respect to the special admixture, And the inorganic binder is usually 20 to 50% by weight of Portland cement, 15 to 45% by weight of blast furnace slag, 5 to 45% by weight of bottom ash, Wherein at least 50% by weight of the inorganic binder is blast furnace slag, 1 to 15% by weight of fly ash, 1 to 15% by weight of fly ash, 1 to 15% by weight of silica fume, 1 to 15% by weight of anhydrous gypsum, Bottom ash and fly ash. &Lt; RTI ID = 0.0 &gt; 8. &lt; / RTI &gt;
delete delete The inorganic pigment according to claim 1, further comprising an inorganic pigment in an amount of 0.1 to 7 wt% based on the inorganic binder, wherein the inorganic pigment is at least one selected from the group consisting of titanium oxide, red iron oxide, yellow iron oxide, chromium oxide (CrO ₃ ) The cement composition according to claim 1,
The high strength and high durability cement concrete composition according to claim 1, wherein the inorganic binder further comprises a water reducing agent, and the water reducing agent is contained in an amount of 0.01 to 5% by weight based on the inorganic binder.
Assembling the mold of the concrete block;
Placing the assembled mold in a hydraulic compactor;
Placing a high-strength and high-durability cement concrete composition selected from any one of claims 1, 4 and 5;
Compressing the punched high-strength and high-durability cement concrete composition with hydraulic pressure while applying vibration;
Curing the molded high strength and high durability cement concrete composition; And
And a step of demolding the cured high-strength and high-durability cement concrete composition in the formwork. The method for producing a concrete block using the cement concrete composition of high strength and high durability.
Assembling the mold of the concrete block;
Mounting the assembled mold on a hydraulic type compaction machine;
Placing a high-strength and high-durability cement concrete composition selected from any one of claims 1, 4 and 5;
Molding the poured high-strength and high-durability cement concrete composition by vibration;
Curing the molded high strength and high durability cement concrete composition; And
And a step of demolding the cured high-strength and high-durability cement concrete composition in the formwork. The method of producing a concrete block using the high-strength and high-durability cement concrete composition.