KR101600776B1 - Cement concrete compositions and pavement construction method therewith - Google Patents

Abstract

The present invention relates to a high performance concrete cement composition and a concrete bridge deck pavement construction method using the same. The high performance concrete cement composition includes 5-40 wt% of a cement binder material, 30-74 wt% of a fine aggregate, 20-64 wt% of a coarse aggregate, and 1-20 wt% of water. The cement binder material includes 5-40 wt% of a cement binder, 30-74 wt% of a fine aggregate, 20-64 wt% of a coarse aggregate, and 1-20 wt% of water. The cement binder includes 26-80 wt% of normal portland cement, 5-40 wt% of furnace slag powder, 1-15 wt% of silica fume, 1-15 wt% of desulfurized plaster, 0.01-10 wt% of calcium aluminate, 0.01-5 wt% of a water-reducing agent, 0.01-5 wt% of a thickener, 0.01-5 wt% of an antifoaming agent, and 0.01-15 wt% of glass powder. According to the present invention, by using industrial by-products in a cement binder material, it is useful in terms of recycling the industrial by-products. In addition, workability and initial reactivity are improved, thereby improving initial strength development and durability. In addition, by using silica admixtures having potential hydraulicity and pozzolanic reaction characteristics, durability is improved such as long-term strength development, chloride penetration resistance, freeze-thaw resistance, alkali-aggregate reaction inhibition, or the like, thereby extending the durability life of a concrete package body.

Description

TECHNICAL FIELD [0001] The present invention relates to a high-performance cement concrete composition and a concrete pavement packaging method using the same.

The present invention relates to a high performance cement concrete composition and a concrete pavement pavement method using the same, more specifically, to improve strength and durability performance, and is particularly useful in terms of recycling industrial byproducts. A high strength cement concrete composition capable of exhibiting high strength development and durability improvement effects, and a concrete pavement pavement method using the same.

Generally, if cracks occur in concrete due to deterioration etc., it may cause fatal defects due to deterioration of waterproof performance, corrosion of reinforcing steel, deterioration of durability, and decrease of strength.

Concrete pavement is exposed directly to the atmospheric environment and traffic load. In case of alkali-aggregate reaction, other effects such as freezing-thawing phenomenon and traffic load can be combined, Occurs. It is very difficult to ensure the durability at the time of construction of the concrete structure in which the alkali-aggregate reaction occurs due to the progress of the breakage.

The main cause of freezing and thawing damage of cement concrete is the expansion pressure caused by the change of water to ice, water pressure and osmotic pressure generated by water movement. When an air void is distributed in an appropriate amount and interval in the concrete, the void acts as a passage of the water flow, so that the internal tensile stress due to the internal pressure and the volume expansion can be relaxed, do. On the contrary, if the air voids are not distributed in proper amounts and intervals, the tensile strength of the cement paste exceeds the tensile strength, causing cracks in the concrete.

In addition, chemical corrosion is a general term of deterioration phenomenon in which concrete receives external chemical action and loses bonding ability by modifying or decomposing the hydration product constituting the hardened cement body.

It is easy to be confused with the existing alkali-aggregate reaction, deterioration due to sea-ice and salt attack, and it is not replaced with sulfuric acid repair mortar in concrete structure. So that the durability is rapidly deteriorated.

Korean Patent Registration No. 10-1300042 (registered on August 20, 2013) Korean Patent Registration No. 10-1426691 (Registered on July 30, 2014)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cement paste composition which is useful as an industrial by-product and has high durability, The present invention provides a high performance cement concrete composition capable of exhibiting an improvement in durability and a concrete pavement paving method using the same.

A high performance cement concrete composition according to an embodiment of the present invention is a high performance cement concrete composition comprising 5 to 40 wt% of cement binder, 30 to 74 wt% of fine aggregate, 20 to 64 wt% of coarse aggregate and 1 to 20 wt% Wherein the cement binder comprises 26 to 80% by weight of Portland cement, 5 to 40% by weight of blast furnace slag, 1 to 15% by weight of silica fume, 1 to 15% by weight of desulfurized gypsum, 0.01 to 10% by weight of calcium aluminate, 0.01 to 5% by weight of a thickener, 0.01 to 5% by weight of a thickener, 0.01 to 5% by weight of an antifoamer, and 0.01 to 15% by weight of a glass powder.

In one embodiment, the cement binder further comprises 0.01 to 10% by weight of tridimite.

In another embodiment, the cement admixture further comprises 0.1 to 5% by weight of wood ash.

In another embodiment, the cement binder further comprises 0.1 to 5% by weight of fine powder.

The concrete pavement pavement method using the high-performance cement concrete composition according to the present invention is a concrete pavement pavement method using a high-performance cement concrete composition. The concrete pavement is cut and blasted using a crusher, a planer, a short blaster, Removing impurities; Cleaning the removed area; Sprinkling on the cleaned area to maintain the wet state; Bumming or primer treatment to obtain adhesion and waterproofing effect with the concrete slab after maintaining the wet state; Casting the above-described high performance cementitious concrete composition onto the broomed or primed top; A step of tearing to increase crack resistance and slip resistance after being poured; And curing using a curing agent to prevent evaporation of water at the top after tanning to prevent initial plastic cracking, wherein the curing step comprises curing Depending on the condition, 1) spray the curing agent only, 2) spray the curing agent, cover the top with vinyl or curing cloth to keep it wet and keep it wet, or 3) spray the curing agent with vinyl, curing cloth, And curing while maintaining the thermal insulation.

Industrial Applicability According to the present invention, by using industrial by-products in cement binders, they are useful in terms of recycling of industrial by-products, and can improve initial strength and durability by improving workability and initial reactivity.

In addition, the durability such as long-term strength development, chloride penetration resistance, freeze-thaw resistance and alkali-aggregate reaction is improved by using silica-silica admixture having potential hydraulic and pozzolanic reaction characteristics, thereby extending the durability life of the concrete pavement.

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.

A high performance cement concrete composition according to a preferred embodiment of the present invention includes cement binder, fine aggregate, coarse aggregate and water.

The cementitious material is contained in an amount of 5 to 40% by weight based on the high-performance cement concrete composition, the fine aggregate is contained in 30 to 74% by weight of the high-performance cement concrete composition, and the coarse aggregate is 20 To 64 wt%, and the water is contained in an amount of 1 to 20 wt% based on the high-performance cement concrete composition.

Aggregates are classified into fine aggregate and coarse aggregate, and those with a grain size of 5 mm or less are referred to as fine aggregate and those having a grain size larger than 5 mm are classified into coarse aggregate.

The fine aggregate is preferably contained in the high-performance cement concrete composition in an amount of 30 to 74 wt%, and the coarse aggregate is preferably contained in the high-performance cement concrete composition in an amount of 20 to 64 wt%.

The cement binder generally comprises 26 to 80% by weight of Portland cement, 5 to 40% by weight of blast furnace slag powder, 1 to 15% by weight of silica fume, 1 to 15% by weight of desulfurizing gypsum, 0.01 to 10% by weight of calcium aluminate, By weight, 0.01 to 5% by weight of a thickener, and 0.01 to 5% by weight of an antifoaming agent.

The cement binder is preferably contained in an amount of 5 to 40% by weight based on the high-performance cement concrete composition.

If the content of the cement binder exceeds 40 wt% with respect to the high-performance cement concrete composition, the workability, strength and durability are improved but drying shrinkage and economic efficiency may be deteriorated. When the content of the cement- If the amount is less than 5% by weight based on the cement concrete composition, the drying shrinkage is small, but the strength and durability may be lowered.

Next, the construction of the cement-based material will be described in detail.

The ordinary Portland cement can usually be Portland cement. Usually Portland cement is preferably used as specified in KS.

The blast furnace slag powder has latent hydraulic characteristics and is used for strength development and durability enhancement. The blast furnace slag powder is preferably contained in an amount of 5 to 40% by weight based on the cement binder.

If the content of the blast furnace slag fine powder is less than 5% by weight, the initial reactivity of the composition may be lowered and the initial strength development and durability improving effect may be deteriorated. If the content of the blast furnace slag fine powder is less than 40% , The durability of the composition is improved but the strength and drying shrinkage may be increased.

The desulfurized gypsum is a gypsum material (phosphate gypsum) that is formed and precipitated as a byproduct when phosphoric acid, which is a raw material of phosphoric acid fertilizer, is treated with sulfuric acid to produce phosphoric acid. It is a gypsum material produced as a by-product in the desulfurization process of the factory. When the desulfurization gypsum is added as in the present invention, etrinzite is sufficiently generated from the beginning and the structure of the cement is densified, thereby increasing the penetration resistance to the chloride ion in the early age.

The desulfurization gypsum is preferably contained in an amount of 1 to 15% by weight based on the cement binder.

If the content of the desulfurization gypsum is less than 1% by weight, the initial formation of etchinite is reduced and the dense structure is difficult to form. When the content of the desulfurized gypsum exceeds 15% by weight, It is possible to obtain good physical properties, but the water resistance may be lowered.

The calcium aluminate is used to obtain the role of an expanding agent in order to reduce initial strength development and drying shrinkage. The calcium aluminate is preferably contained in an amount of 0.01 to 10% by weight based on the cement binder.

When the content of calcium aluminate is less than 1% by weight, the effect of initial strength development and drying shrinkage reduction is reduced. When the content of calcium aluminate is more than 15% by weight, good physical properties It is possible to obtain it, but the water resistance can be lowered.

The water reducing agent is used to improve the strength and durability by reducing the water-cement ratio of the cement mortar composition.

The water reducing agent may be a polycarboxylic acid type, melamine type, aminosulfonic acid type or naphthalene type fluidizing agent.

Here, 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, has a small effect of reducing the water-cement ratio, and has poor compatibility when mixed with the polymer binder There is a disadvantage. Therefore, it is preferable that the water reducing agent is a polycarboxylic acid based water reducing agent and is contained in an amount of 0.01 to 5% by weight based on the cement binder.

The thickener is used to prevent material separation of the high performance cementitious concrete composition. The thickening agent may be methylcellulose, starch, gum or the like, but methylcellulose having excellent thickening effect is preferably used. The thickener is preferably contained in an amount of 0.01 to 5% by weight based on the cement binder.

The antifoaming agent is added to reduce an increase in the amount of air due to generation of entrained air of the high-performance cementitious concrete composition.

The antifoaming agent may be selected from the group consisting of an alcohol type antifoaming agent, a silicone type antifoaming agent, a fatty acid type antifoaming agent, an oil type antifoaming agent, an ester type antifoaming agent and an oxyalkylene type antifoaming agent. ≪ / RTI > may be used. Examples of the silicone defoaming agent include dimethyl silicone oil, polyorganosiloxane, and fluorosilicone oil.

As the fatty acid defoaming agent, stearic acid, oleic acid, and the like can be used. As the oil defoaming agent, kerosene, animal oil, castor oil and the like can be used. Examples of the ester type defoaming agent include solitol trioleate, glycerol monolithic acid Nolate, etc. may be used. As the oxyalkylene antifoaming agents, polyoxyalkylene, acetylene ethers, polyoxyalkylene diazoxide esters, polyoxyalkylene alkylamines and the like can be used. As the alcohol type antifoaming agents, glycol (glycol) may be used.

The defoaming agent is preferably contained in an amount of 0.01 to 5% by weight based on the cement binder.

The cement admixture may further contain 0.01 to 15% by weight of tridimite, 0.01 to 10% by weight of glass powder, 0.1 to 5% by weight of wood ash, and 0.1 to 5% by weight of an optical meal, .

The tridymite is a natural pozzolan material used for improving long-term strength and durability. The tridymite is preferably contained in an amount of 0.01 to 10% by weight based on the cement binder. If the content of tridimite is less than 0.01% by weight, the effect of improving long-term strength and durability is insufficient. When the content exceeds 10% by weight, the reactivity is increased and cracking may occur.

The glass powder is used as a silica material to suppress long-term strength development and alkali-aggregate reaction by pozzolanic reaction. The glass powder is preferably contained in an amount of 0.01 to 15% by weight based on the cement binder. If the content of the glass powder is less than 0.01% by weight, the reactivity decreases and the durability improvement effect decreases. If the content of the glass powder exceeds 15% by weight, initial strength drop and shrinkage may become large.

The wood ash forms a dense structure due to latent hydraulic characteristics, thereby enhancing long-term strength and improving durability. The wood ash is preferably contained in an amount of 0.1 to 5% by weight based on the cement binder. If the content of the wood ash is less than 0.1% by weight, the effect of improving the strength and improving the durability is insufficient. If the content exceeds 5% by weight, the workability is lowered.

The extrudate is added to increase the friction of the road, and may have a diameter of, for example, 8 mm.

Here, the reason for limiting the amount of the extrudate to 0.1 to 5% by weight with respect to the cement based binder is that when the content of the extrudate is 0.1% by weight or less, the effect of increasing friction is insufficient. When the content of the extrudate is 5% This is because it lowers the bonding force.

The high-performance cement concrete composition according to the preferred embodiment of the present invention can be produced by the following method.

Cement binder, fine aggregate and coarse aggregate are mixed at a certain ratio and stirred in a forced mixer or a continuous mixer. The cement binder is mixed with 5 to 40 wt% of the high-performance cement concrete composition and the fine aggregate is mixed with 30 to 74 wt% of the high-performance cement concrete composition. The coarse aggregate is mixed with the high- By weight to 64% by weight.

The mixture of the cementitious material, the fine aggregate and the coarse aggregate is further mixed with water at a predetermined ratio and stirred for 1 to 10 minutes. The water is preferably mixed with the high-performance cement concrete composition in an amount of 1 to 20% by weight.

The concrete pavement pavement method using a high performance cement concrete composition according to a preferred embodiment of the present invention includes steps of removing a concrete and impurities by cutting and blasting a concrete pavement using a crusher, a planer, a shot blaster, or the like; Cleaning the removed part with hand water or the like; Sprinkling on the cleaned area to maintain the wet state; Bumming or primer treatment to obtain adhesion and waterproofing effect with the concrete slab after maintaining the wet state; Casting a high performance cementitious concrete composition according to any one of the embodiments of the high performance cementitious concrete composition as described above at the top of the brumming or primed top; A step of tearing to increase crack resistance and slip resistance after being poured; And a step of curing using a curing agent to prevent evaporation of moisture at the upper portion after the tinning and to prevent the initial plastic cracking.

Particularly, in the above-mentioned curing step, when the atmospheric conditions (for example, in the summer, when the atmospheric temperature (25 ° C or higher) is high and the relative humidity is low and windy atmosphere is used, the vinyl, Conversely, if the atmospheric temperature is lower than 25 ℃ and the relative humidity is high, and the wind conditions are low, spray only the curing agent and cure. And spraying with water, covering the upper part with vinyl, curing, etc., and curing while maintaining the wet state. When the atmospheric temperature is lower than 5 占 폚, the method may further include a step of performing thermal curing using vinyl, curing cloth, heat shield, etc. after spraying the curing agent.

Hereinafter, the above-mentioned brooming or primer treatment is used for the purpose of facilitating the adhesion of the high-performance cement concrete composition to the concrete slab. As the bumming material, at least one selected from styrene butadiene rubber (SBR) latex, polyacrylic ester (PAE), epoxy emulsion, ethyl vinyl acetate (EVA) and acrylic emulsion is selected, Used as binder. The brooming composition is prepared by mixing cement and fine aggregate in a weight ratio of 1: 0.2 to 2 and polymer binder in an amount of 10 to 70% by weight based on cement for 1 to 5 minutes in a forced mixer or continuous mixer.

The primer material may be selected from at least one selected from the group consisting of SBR (Styrene Butadiene Rubber) latex, polyacrylic ester (PAE), epoxy emulsion, ethyl vinyl acetate (EVA) and acrylic emulsion. .

At this time, the application of the solid content of the primer by lowering the solid content to about 10% by weight is intended to prevent the adhesion performance from deteriorating because the thickness of the film formed when the solid content of the primer exceeds 10% by weight is increased .

Hereinafter, embodiments of the high-performance cement concrete composition according to the present invention will be described more specifically, but the present invention is not limited to the following embodiments.

≪ Example 1 >

19 wt% of cement binder, 40 wt% of fine aggregate, and 34 wt% of coarse aggregate were mixed and stirred in a forced mixer. Then, 7 wt% of water was further mixed and stirred for 2 to 3 minutes to prepare a high performance cement concrete composition.

The cement binder is usually composed of 85 wt% of Portland cement, 8 wt% of blast furnace slag, 2 wt% of silica fume, 2 wt% of desulfurized gypsum, 1 wt% of calcium aluminate, 0.2 wt% of water reducing agent, 0.2 wt% 0.5% by weight of tridymite, 0.2% by weight of glass powder, 0.5% by weight of wood ash and 0.2% by weight of an inorganic fine powder.

A polycarboxylic acid-based water reducing agent was used as the water reducing agent. The defoamer was a silicone defoamer. A methylcellulose thickener was used as the thickener.

≪ Example 2 >

19 wt% of cement binder, 40 wt% of fine aggregate, and 34 wt% of coarse aggregate were mixed and stirred in a forced mixer. Then, 7 wt% of water was further mixed and stirred for 2 to 3 minutes to prepare a high performance cement concrete composition.

The above-mentioned cement binder usually contains 80 wt% of Portland cement, 10 wt% of blast furnace slag, 3 wt% of silica fume, 3 wt% of desulfurized gypsum, 2 wt% of calcium aluminate, 0.2 wt% of water reducing agent, 0.2 wt% 0.5% by weight of tridymite, 0.2% by weight of glass powder, 0.5% by weight of wood ash and 0.2% by weight of an inorganic fine powder.

A polycarboxylic acid-based water reducing agent was used as the water reducing agent. The defoamer was a silicone defoamer. A methylcellulose thickener was used as the thickener.

≪ Example 3 >

19 wt% of cement binder, 40 wt% of fine aggregate, and 34 wt% of coarse aggregate were mixed and stirred in a forced mixer. Then, 7 wt% of water was further mixed and stirred for 2 to 3 minutes to prepare a high performance cement concrete composition.

The cement binder is usually composed of 75 wt% of Portland cement, 15 wt% of blast furnace slag, 3 wt% of silica fume, 3 wt% of desulfurized gypsum, 2 wt% of calcium aluminate, 0.2 wt% of water reducing agent, 0.2 wt% 0.5% by weight of tridymite, 0.2% by weight of glass powder, 0.5% by weight of wood ash and 0.2% by weight of an inorganic fine powder.

A polycarboxylic acid-based water reducing agent was used as the water reducing agent. The defoamer was a silicone defoamer. A methylcellulose thickener was used as the thickener.

In order to compare the physical properties of the high-performance cement concrete compositions prepared according to the above-described Examples 1 to 3, a general cement concrete composition which is generally widely used at present is shown as Comparative Example 1. [

≪ Comparative Example 1 &

19 wt% of cement binder, 40 wt% of fine aggregate, and 34 wt% of coarse aggregate were mixed and stirred in a forced mixer. Then, 7 wt% of water was further mixed and stirred for 2 to 3 minutes to prepare a cement concrete composition.

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

≪ Test Example 1 >

Table 1 below shows the results of testing the strength of the cement concrete composition prepared according to Comparative Example 1 and the high performance cement concrete composition prepared according to Examples 1 to 3 of the present invention.

Tests were conducted according to the standards of KS F 2405 (Method of compressive strength test of concrete), KS F 2408 (Test method of flexural strength of concrete) and KS F 2476 (Test method of polymeric cement mortar). The test specimen was based on 28 days of curing period.

Example 1 Example 2 Example 3 Comparative Example 1 burglar
(kgf / cm2) warp 60 63 68 52 compression 450 477 501 440 adhesion 1.85 1.9 2.0 1.6

As shown in Table 1, the compositions (Examples 1, 2 and 3) prepared according to the present invention had significantly higher flexural, compressive and adhesive strengths than the cement concrete compositions prepared according to Comparative Example 1. That is, it was confirmed that the high-performance cement concrete composition produced according to the present invention is much superior in strength to the cement concrete composition prepared according to the comparative example.

≪ Test Example 2 &

The rate of change in length was measured by the high performance cement concrete composition prepared according to Examples 1 to 3 of the present invention and the cement concrete composition prepared according to Comparative Example 1 by KS F 2424 (length change test method of concrete) The results are shown in Table 2 below.

Example 1 Example 2 Example 3 Comparative Example 1 Length change rate (%) 0.06 0.04 0.03 0.1

As shown in Table 2, it was confirmed that the high-performance cement concrete composition prepared according to Examples 1 to 3 according to the present invention had shrinkage reduction effect due to reduced drying shrinkage as compared with the cement concrete composition prepared according to Comparative Example 1 I could.

≪ Test Example 3 >

The following Table 3 shows the results of the cement-concrete compositions prepared according to Comparative Example 1 and the high-performance cement concrete compositions prepared according to Examples 1 to 3 according to the present invention, according to the method specified in KS F 2456, The measurement result of the test is 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 Durability index 83 85 88 69

As shown in Table 3, the durability of the high-performance 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, .

<Test Example 4>

The cement concrete composition prepared according to Comparative Example 1 and the high performance cement concrete composition prepared according to Examples 1 to 3 were measured according to the method defined in KS F 2476 (Test Method of Polymer Cement Mortar) Lt; tb &gt; 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 Absorption Rate (%) 1.6 1.3 1.1 2.0

As shown in Table 4 above, the high-performance cement concrete composition prepared according to Examples 1 to 3 had a lower water absorption rate than the cement concrete composition prepared according to Comparative Example 1.

&Lt; Test Example 5 >

The high performance cement concrete compositions prepared according to Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Example 1 were tested by KS F 2476, and the results are shown in Table 5 below.

Example 1 Example 2 Example 3 Comparative Example 1 Chloride ion penetration depth (mm) 1.2 1.0 0.7 2.1

As shown in Table 5, according to Examples 1 to 3, the high-performance cement concrete composition had a lower chloride ion penetration depth than the cement concrete composition prepared according to Comparative Example 1, there was.

&Lt; Test Example 6 >

Table 6 shows the results of measurement of the neutralization penetration depth according to the method of KS F 2476 for the high performance cement concrete composition and the test specimen of Comparative Example 1 according to the above-described Examples 1, 2 and 3. [

division Example 1 Example 2 Example 3 Comparative Example 1 Neutralization depth (mm) 0.7 0.4 0.2 1.1

As shown in Table 6 above, it was confirmed that the high performance cement concrete compositions according to Examples 1, 2, and 3 had lower neutralization penetration depth than Comparative Example 1 and were more resistant to neutralization.

&Lt; Test Example 7 >

The cement mortar composition prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 were dissolved in 2% hydrochloric acid and 5% hydrochloric acid according to the Japanese Industrial Standards (original test method for chemical resistance test by solution immersion in concrete) Sulfuric acid, and 45% sodium hydroxide was immersed in the test solution for 28 days. The results of the chemical resistance test are shown in Table 7 below.

division Example 1 Example 2 Example 3 Comparative Example 1
Weight change rate (%)
Hydrochloric acid -1.5 -1.3 -1.1 -2.3 Sulfuric acid -0.4 -0.3 0.25 -0.8 Sodium hydroxide +0.5 +0.7 +1.0 0

As shown in Table 7 above, the cement mortar composition prepared according to Examples 1 to 3 exhibited less weight change rate with respect to chemical resistance than the cement mortar composition prepared according to Comparative Example 1, and showed resistance to chemical resistance High.

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 (5)

As a high performance cement concrete composition,
5 to 40 wt% of cement binder, 30 to 74 wt% of fine aggregate, 20 to 64 wt% of coarse aggregate, and 1 to 20 wt% of water,
The cement binder generally comprises 26 to 80% by weight of Portland cement, 5 to 40% by weight of blast furnace slag powder, 1 to 15% by weight of silica fume, 1 to 15% by weight of desulfurizing gypsum, 0.01 to 10% by weight of calcium aluminate, 0.01 to 5 wt.% Of a thickener, 0.01 to 5 wt.% Of an antifoam, 0.01 to 15 wt.% Of a glass powder, 0.01 to 10 wt.% Of tridymite, 0.1 to 5 wt. By weight, based on the total weight of the cement composition.
delete delete delete As concrete pavement pavement method using high performance cement concrete composition,
Removing concrete and impurities by cutting and blasting the concrete brick using a crusher, a planer, a shot blaster, or the like;
Cleaning the removed area;
Sprinkling on the cleaned area to maintain the wet state;
Bumming or primer treatment to obtain adhesion and waterproofing effect with the concrete slab after maintaining the wet state;
Casting the high-performance cement concrete composition according to claim 1 onto a brimmed or primed top;
A step of tearing to increase crack resistance and slip resistance after being poured;
Curing by using a curing agent to prevent evaporation of water at the upper part after the tinning and to prevent initial plastic cracking,
Here, the curing may include:
Depending on the atmospheric conditions, including the temperature, humidity and wind strength of the site, 1) spray only the curing agent, 2) spray the curing agent, cover the top with vinyl or curing cloth to maintain the wet state, or 3) ) After applying the curing agent, use the vinyl, curing cloth, or heat shield to separate the curing steps while maintaining the thermal insulation
The concrete pavement paving method using a high-performance cement concrete composition.