KR101637454B1 - Composition for impregnant of concrete and concrete rod construction method using the same thing - Google Patents

Abstract

The present invention relates to a surface-active agent comprising 65 to 75% by weight of a surface penetrant; And 25 to 35% by weight of a photocatalyst based on the weight of the surface penetrant; and a method of constructing a concrete road structure using the same, wherein the composition is effective for purification of air pollution, To improve the mechanical properties and durability performance, to prevent deterioration, to extend the service life, and to improve applicability, workability, and economy.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete composition for impregnating concrete, and a method for constructing a concrete road structure using the same. BACKGROUND ART < RTI ID = 0.0 >

TECHNICAL FIELD The present invention relates to a construction material field, and more particularly, to a concrete impregnating composition and a construction method of a concrete road structure using the same.

As a member of the Organization for Economic Cooperation and Development (OECD) member countries, global warming and global environmental problems must be addressed in each sector in a modern society where international efforts are being made to cope with environmental pollution.

At present, air pollution in the metropolitan area is one of the 30 poorest member countries of the Organization for Economic Cooperation and Development (OECD) (Figure 1).

In this way, the cause of the seriousness of domestic air pollution is the traffic pollution source (34.4%).

The graph shown in FIG. 2 shows contribution rates of air pollutants among road pollution sources, and it can be confirmed that the ratio of nitrogen oxides (NOx) is considerably high.

In addition, the graph shown in FIG. 3 shows a tendency of changes in air pollutants, and it can be seen that the NOx emission amount shows a marked increase due to a steep increase in the number of automobile operations continuously (Ministry of Environment, 2010) .

Such NOx is a harmful air pollutant discharged from road moving pollutants such as automobiles and stationary sources such as industrial boilers and power generation facilities. In particular, NOx pollution due to automobile exhaust gas in metropolitan areas is serious. to be.

Nitrogen oxides (NOx) are the gas components responsible for photochemical smog and acid rain as well as respiratory illnesses.

A nitrogen oxide (NOx), NO _2, particularly when present in the atmosphere around 50ppm as hazardous components, and is known to result in the death of the organism, can lead to respiratory failure, even low concentrations of between 0.05 and 0.2ppm.

At present, as a method for purifying air pollution caused by nitrogen oxides (NOx), purification and non-detoxification of nitrogen oxides (NOx) using the photocatalytic action of titanium dioxide (TiO ₂ ) are used.

This method is based on the principle that a photocatalyst reacts with solar energy and oxidizes and removes pollutants from the air by nitrogen oxides (NOx), organic chlorine compounds, and the like.

FIG. 4 shows an organic decomposition mechanism of titanium dioxide (TiO ₂ ), which is a representative photocatalyst material.

As shown in FIG. 4, when a certain region of energy (a wavelength of 3.2 eV or more and a wavelength of 388 nm or less) is applied to a titanium dioxide (TiO ₂ ) semiconductor, electrons are regarded as a conduction band in a valence band do.

At this time, electrons (e ^- ) are formed in the conduction band and holes (h ⁺ ) are formed in the valence band.

The electrons and holes formed in this manner cause various reactions such as separating harmful substances by strong oxidizing or reducing action.

The electrons (e ^- ) and holes (h ⁺ ) generated by the light coming into the photocatalytic titanium dioxide react with O ₂ and H ₂ O in the air, respectively, and superoxide anion (O ₂ ^- ) and hydroxyl radical (OH <">).

Particularly, since the hydroxyl radical has a high oxidation and reduction potential, it is excellent in the purification of NOx, SOx, VOCs and various odors, and is excellent in the BOD of the animal wastewater, sewage, factory wastewater, Hormones, etc., as well as the ability to oxidize the target substance, such as 99% sterilization of various pathogens and bacteria such as pathogenic Escherichia coli, Staphylococcus aureus, and O-157.

If this principle is applied to road pavement material, it will be effective to prevent urban air pollution by directly absorbing and removing harmful gas emitted from automobiles.

However, a photocatalyst exhibiting excellent performance in the decomposition of organic pollutants has a disadvantage in that it can not exhibit the above performance in a light-free environment. Therefore, when applied to practical road pavement, the performance can be exhibited even in a light- I need a plan.

In addition, in some European countries and Japan, a method of applying a photocatalytic material to a sidewalk block is being developed as a method of replacing part of cement.

However, this method requires a lot of photocatalyst because the content of the photocatalyst is considerably thick, and considering that the photocatalytic reaction is a reaction with the atmosphere, the photocatalyst existing in the inside does not receive light or contact with the exhaust gas The function of the photocatalyst can not be exhibited, so that the photocatalyst is wasted.

Considering that the price is wide depending on the type of photocatalyst, applying the photocatalyst to the concrete with the above substitution combination is considerably disadvantageous in terms of economy and efficiency.

Thus, there is insufficient research on the application and utility of applying photocatalyst to concrete.

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 method and apparatus for effectively cleaning air pollution and improving the mechanical properties and durability of concrete structures including road pavement, preventing deterioration, And a method of constructing a concrete road structure using the same.

In order to solve the above-mentioned problems, the present invention relates to a surface-permeation agent comprising 65 to 75% by weight; And 25 to 35% by weight of a photocatalyst based on the weight of the surface penetrant.

The photocatalyst is preferably titanium dioxide (TiO ₂ ).

Preferably, the titanium dioxide (TiO ₂ ) is a mixture of any one or more of anatase and rutile.

It is preferable that the surface wetting agent is an organic surface wetting agent as well as a liquid type silicate surface wetting agent.

The surface impregnating agent comprises 1 to 10% by weight of hydrogen fluoride; 5 to 15% by weight of magnesium carbonate; 10 to 20% by weight of silica gel; And 60 to 80% by weight of water.

The present invention is a method of constructing a concrete road structure using the concrete impregnating composition, comprising: mixing the surface impregnant and the photocatalyst to form the concrete impregnating composition; And impregnating the surface of the concrete with the composition for impregnating the concrete.

The impregnating step may spray the concrete-impregnating composition onto the concrete surface.

The impregnation step is preferably performed at room temperature (10 to 30 DEG C).

In the impregnating step, when the concrete is not hardened, it is preferable that the concrete impregnating composition is impregnated at the time when the water on the surface of the concrete is dried.

The present invention relates to a concrete impregnating composition which is effective for purification of air pollution, improves the mechanical properties and durability of concrete structures including road pavement, prevents deterioration, prolongs service life, and improves applicability, And a method of constructing a concrete road structure using the same.

1 to 3 are diagrams for explaining the background art,
Fig. 1 is an image showing actual condition of air pollution. Fig.
2 is a graph showing contribution rates of air pollutant emissions.
FIG. 3 is a graph showing trends of changes in air pollutants. FIG.
FIGS. 4 to 7 illustrate the concrete impregnating composition of the present invention,
Fig. 4 is an image showing an organic decomposition mechanism of a photocatalyst. Fig.
5 is a view showing the surface state of the surface penetrant.
6 is a view showing the particle structure of the surface penetrant.
7 is a perspective view showing a crystal structure of titanium dioxide.
FIGS. 8 to 16 illustrate experimental examples for testing the performance of the concrete impregnating composition of the present invention.
8 is an image showing a sample preparation process for mortar mixing.
9 is an image showing a process for measuring the penetration depth of the photocatalyst.
10 is a graph showing the results of detection of titanium according to substitution.
11 is a graph showing the results of titanium detection according to the coating method.
12 is a graph showing the detection results of titanium according to the penetration method using a surface penetrant.
13 is a graph showing depth of penetration of titanium according to penetration method using a surface penetrant.
14 is a graph showing the penetration depth of titanium according to the substitutional combination.
15 is a graph showing the depth of penetration of titanium with penetration of P-25.
16 is a graph showing the penetration depth of titanium according to penetration of CR-57.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and the accompanying drawings.

The composition for impregnating concrete according to the present invention comprises 65 to 75% by weight of a surface penetrant; And 25 to 35% by weight of the photocatalyst, based on the weight of the surface penetrant.

In addition, the above-mentioned composition for impregnating concrete is impregnated on the concrete surface to form a photocatalytic concrete.

Such a composition for impregnating concrete and the photocatalytic concrete impregnated with the composition have the following advantages.

First, since the photocatalyst has a function of oxidizing and removing air pollutants by nitrogen oxides (NOx), organic chlorine compounds, etc., it has an advantage that air pollution purification is effective.

That is, the concrete road itself can exhibit the atmospheric purification performance.

Second, the photocatalyst is stably impregnated up to the optimum depth on the concrete surface, and the effect of the photocatalyst is maintained even when the road is abraded.

It also has the advantage of being able to maintain the surface of clean road pavement over a long period of time.

Third, it has an advantage of improving the mechanical performance and durability of concrete road through the surface penetration agent and preventing the deterioration, thereby extending the service life of the road.

Fourth, there is an advantage that applicability, workability and economical efficiency can be improved.

The concrete impregnating composition of the present invention, which can achieve these advantages, will be described in more detail as follows.

First, the photocatalyst of the present invention uses titanium dioxide (TiO ₂ ).

In general, as a material showing characteristics of a photocatalyst, there are ZnO, CdS, TiO2, SnO2, WO3, etc. and a perovskite type metal complex compound (SrTiO3).

Although each of these photocatalysts has a great difference in their ability to decompose organic materials, the semiconductor material that can be used in the actual photocatalytic reaction must be optically light-free and active.

Of these, titanium dioxide (TiO ₂ ) is a typical material used as a photocatalyst and has chemical stability that is not eroded by acids, bases and organic solvents, and is the ninth most abundant element in the earth.

In addition, it is excellent in abrasion resistance and durability, and it is advantageous in that it is abundant in resources and cheap in price because there is no concern about secondary pollution even when disposing it as safe and nontoxic substance itself.

FIG. 4 shows a mechanism for decomposing organic substances of titanium dioxide (TiO ₂ ) used in the present invention.

As shown in FIG. 4, when a certain region of energy (a wavelength of 3.2 eV or more and a wavelength of 388 nm or less) is applied to a titanium dioxide (TiO ₂ ) semiconductor, electrons are regarded as a conduction band in a valence band .

At this time, electrons (e) are formed in the conduction band and holes (h +) are formed in the valence band.

The electrons and holes formed in this manner cause various reactions such as separating harmful substances by strong oxidizing or reducing action.

The electrons (e ^- ) and holes (h ⁺ ) generated by the light coming into the photocatalytic titanium dioxide react with O ₂ and H ₂ O in the air, respectively, and superoxide anion (O 2 ^- ) and hydroxyl radical OH < ^- & gt ^; ).

Particularly, since the hydroxyl radical has a high oxidation and reduction potential, it is excellent in the purification of NOx, SOx, VOCs and various odors, and is excellent in the BOD of the animal wastewater, sewage, factory wastewater, Hormones, etc., as well as the ability to oxidize the target substance, such as 99% sterilization of various pathogens and bacteria such as pathogenic Escherichia coli, Staphylococcus aureus, and O-157.

The titanium dioxide (TiO ₂ ) of the present invention may be any one or a mixture of two or more of anatase and rutile.

In general, titanium dioxide (TiO ₂ ) has three types: anatase, rutile, and brookite.

Among them, the brookite type is not industrially used and is known to have almost no photocatalytic effect.

In the case of anatase, white pigment is widely used for photocatalyst, and it is known that it is the most active.

It also has a feature of changing to a rutile type at a high temperature of 900 ° C or higher.

In the case of rutile, it is widely used industrially such as white pigment and is used for photocatalyst.

This is characterized by excellent coloring power and thermal stability.

7 shows the crystal structure of titanium dioxide (TiO ₂ ).

On the other hand, in the concrete impregnating composition of the present invention, the surface penetrant is an organic surface surface penetrant and a liquid type silicate surface surface penetrant.

In case of an inorganic surface penetrant, it is disadvantageous in that it is not practical in domestic application and is economically disadvantageous.

The silicate-based surface penetration agent does not cause deformation when the photocatalyst is chemically reacted with sunlight, and penetrates the concrete surface internally, thereby improving the strength and durability of the concrete.

The concrete impregnated with the photocatalyst using the surface impregnant exhibits the effect of improving adhesion and filling, as well as improving the strength due to the activation of the internal chemical reaction and the increase of the coefficient of friction.

The surface penetrant of the present invention comprises 1 to 10% by weight of hydrogen fluoride; 5 to 15% by weight of magnesium carbonate; 10 to 20% by weight of silica gel; 60 to 80% by weight of water;

Table 1 shows the composition ratio of the surface penetrant.

This surface penetration agent activates a pozzolanic reaction in which CSH (calcium silicate hydrate) and calcium hydroxide (Ca (OH) 2) crystals, which are known as silicate gels, are formed in the capillary pores by hydration reaction with cement clinker .

The silicate (Na ₂ O, SiO ₂ ) component of the surface penetrant is produced in the capillary pore in the form of CSH by the chemical reaction with the inactivated calcium hydroxide during the pozzolanic reaction to reduce the porosity inside the concrete sphere.

Therefore, the concrete with surface penetration agent has the advantage that it forms denser structure than general portland cement concrete in terms of mechanical performance improvement and durability enhancement.

Since the surface penetrant should basically not affect the hydration of the cement, it is preferable that it is similar to the composition of the cement constituent.

The major components of cement are calcite, clay and gypsum, and the main component of the colloidal silica solution is SiO ₂ , which is the main component of the calcareous system, so no special chemical reaction occurs due to the adsorbed colloidal silica solution.

The silicate, which is a raw material of the surface penetrant, means a bonded body based on silica (SiO ₂ ).

The basic mechanism of the silicate-based surface penetrant of the present invention can be largely explained by the siloxane bond and the zeta potential.

The surface penetrant solution is generally small in size from 1 to 100 nm and therefore has excellent penetration ability.

Fig. 5 shows the surface state of the surface impermeant solution, and Fig. 6 shows the particle structure of the surface impermeant solution.

Meanwhile, as a method of constructing a concrete road structure using a composition containing a photocatalyst, there are a method of substituting a portion of cement, a method of coating using an aqueous curing agent, a method of penetrating a photocatalyst using a surface penetrant have.

First, the method of replacing part of cement is used in some European countries and Japan when applying photocatalytic material to a news bullock and the like.

Currently, the most active research has been conducted, showing positive effects on reducing air pollution through patent and test construction.

However, the above method has a disadvantage that the photocatalyst must be used in a large amount because the content of the photocatalyst is considerably thick.

Considering that the reaction of the photocatalyst is in contact with the atmosphere, there is a problem that the photocatalyst existing in the inside does not receive light or does not come into contact with the exhaust gas, .

Considering that there is a large difference in price depending on the type of photocatalyst, it is difficult to put concrete road by the above substitution mixture because economical efficiency and efficiency can not be ensured and practical use is difficult.

In addition, in the case of the coating method using an aqueous curing agent, the photocatalyst is expected to have a sufficient effect because the photocatalyst directly contacts with the wide atmosphere.

However, there is a problem in that it is not easy to use for a long period of time due to a decrease in photocatalyst caused by abrasion or friction of concrete pavement.

On the other hand, the method used in the present invention, that is, the method of infiltrating the photocatalyst using the surface penetrant, has no advantage of abrasion depending on the depth of penetration and can use an appropriate amount of the photocatalyst.

Further, since the atmosphere in contact with the exhaust gas of the automobile is wide, the effect of purifying the air of the photocatalyst can be sufficiently exhibited.

In addition, it can be considered as the most suitable method to construct concrete road because it can secure economical efficiency compared with the above methods.

A method of constructing a concrete road structure using the concrete impregnating composition of the present invention is as follows.

First, a mixing step is carried out in which a surface impregnant and a photocatalyst are mixed to form a concrete impregnating composition.

Then, an impregnation step of impregnating the surface of the concrete with the concrete impregnating composition is performed.

In this impregnation step, it is preferable that the composition for impregnating the concrete is sprayed onto the concrete surface by spraying or the like.

In addition, since the impregnation temperature at the impregnation step is not limited, there is an advantage that the operation is easy.

Therefore, impregnation can be easily performed at room temperature (10 to 30 ° C).

When the concrete is not hardened, it is preferable to impregnate the concrete impregnating composition at the time when the water on the concrete surface is dried.

Also, in the case of hardened concrete, the impregnation time of the concrete impregnating composition is always possible.

Concrete road structures formed by such a construction method may include concrete roads, median blocks of roads, roadside curbs, and the like.

Hereinafter, experimental examples for explaining the effects of the present invention will be described.

In the present invention, the distribution and penetration analysis of a photocatalyst, that is, titanium dioxide (TiO ₂ ), was performed using a field emission scanning electron microscope (SEM / EDAX).

Table 2 shows the photocatalyst and application factors used in the experiment.

In the case of the photocatalyst, nano (25 nm) particles and P-25 as an anatase were used. As the application factors, there are a method of penetrating the surface penetrant as disclosed in the present invention, a photocatalyst substitution compounding method widely used outside the country, The applied method was used.

In case of substitution, 5% of cement amount was substituted with photocatalyst and the other two application factors were sprayed on the surface to confirm the detection of photocatalyst.

FIG. 8 shows a process for producing a mortar specimen in which titanium dioxide (TiO ₂ ) as a photocatalyst is mixed at a ratio of 1: 2.

In the case of mortar specimens, specimen size should be small in order to carry out the experiment to confirm the detection of titanium. In order to carry out the experiment to remove NOx, 2cm x 2cm x 2cm was made.

The mortar mixture was prepared by replacing 5% of cement with TiO2 during the substitution of titanium dioxide (TiO2) (5%). The 1: 2 mortar specimen mixed with the organic surface impregnant and aqueous curing agent, Lt; / RTI >

A field emission scanning electron microscope (SEM / EDAX) can obtain a high-brightness electron beam by using an electron gun which attracts electrons from the surface by applying a strong positive potential to the metal surface.

Therefore, it is possible to perform analysis with high resolution and high magnification, and it is a device that can detect various signals generated on the surface of a sample and analyze the shape, structure, and components of the material.

In order to determine the photocatalyst (TiO2) detection according to the powder diagram of the photocatalyst (TiO2), microstructure and composition analysis were carried out using field emission scanning electron microscope.

In order to determine whether the photocatalyst is detected at an appropriate depth, the measurement was made as shown in Fig.

In order to perform EDAX analysis, the sample must be in a vacuum state. Therefore, as shown in FIG. 9, a portion of 10 mm or more from the center of the specimen was separated again into specimens and subjected to EDAX analysis.

Various application methods were analyzed based on 0.33mm from the surface of the specimen considering the proper depth, effect and economical aspect of the photocatalyst.

FIG. 10 shows the results of EDAX analysis of titanium detection according to a method of replacing and mixing part of cement.

As a result of substituting the content of the photocatalyst into 5%, the mass ratio of titanium was 3.38%.

As a result of the analysis, it can be confirmed that although the photocatalyst consumes a large amount of photocatalyst in the case of the substitution compound, the photocatalyst is consumed more because the photocatalyst is not in contact with the exhaust gas except for the surface of the concrete, .

11 shows the results of EDAX analysis of titanium detection according to the coating method using an aqueous curing agent.

From the EDAX analysis results, it can be seen that the mass ratio of titanium was not detected.

That is, when 5% of the photocatalyst was sprayed onto the specimen, Si as the main component of the curing agent was detected, but no titanium was detected.

Therefore, it was considered that the above method would not be able to exert the function of the photocatalyst on the concrete surface over time.

FIG. 12 shows the results of EDAX analysis of titanium detection according to the penetration method using the organic surface impregnant shown in the present invention.

EDAX analysis showed that the mass ratio of titanium was detected to be 14.83%.

In other words, the mass ratio of titanium was 3.38% in the EDAX analysis.

As a result of substituting 5% of the content of the photocatalyst, titanium has a mass ratio of less than 5%.

In the case of the substitution compound, a large amount of photocatalyst is consumed, but the inside of the concrete except the surface is not in contact with the exhaust gas, so that the photocatalyst is consumed because the photocatalyst can not play the role.

Therefore, the economical efficiency and the efficiency of the photocatalyst are lowered.

In addition, titanium was not detected in the case of the coating using an aqueous curing agent, and the loss of the photocatalytic effect due to the abrasion and oxidation due to the automobile would be accelerated to be applied to the concrete pavement.

Titanium was detected at 0.33 mm using the organic surface impregnant according to the present invention, and it was confirmed that adequate penetration depth of the photocatalyst was shown and sufficient economical efficiency was secured compared with the formulation and coating.

In other words, it is best to use an organic surface impregnant to penetrate concrete pavement.

On the other hand, even if road abrasion occurs, the photocatalyst distribution in which the photocatalysts are distributed from the surface to a certain depth in order to exhibit the effect of the photocatalyst is an optimum photocatalyst distribution.

As shown in Fig. 13, it was judged that the most optimal distribution was that the more the photocatalyst was distributed, the closer the surface was within 3 mm from the surface.

Therefore, the penetration method using the organic surface impregnant was applied and the penetration depth was measured according to the particle and kind of the photocatalyst.

In addition, in order to confirm the difference between the general results of substitution of the photocatalyst and the difference in the specimen using the organic surface impregnant according to the present invention, the results of the method using the photocatalyst replacement and the method using the organic surface impregnant were compared and analyzed .

In the case of nanoparticles from the surface to a certain depth from the surface of the photocatalyst, the penetration will be easy because the particles are small.

On the other hand, in the case of microparticles, the size of the particles is larger than that of the nanoparticles. Therefore, it is considered that penetration is not easy.

Therefore, in the present invention, various photocatalysts were used for the type of photocatalyst and particle size, and experiments were carried out in consideration of penetration depth and economical efficiency.

Anatase and rutile types were used for the photocatalysts. P-25 (25m), K-100 (0.25-0.35um) for the anatase and MPT-100 (30nm) and CR-57 Respectively.

As shown in Table 3, experiments were performed by dividing into nano, microsize and titanium dioxide types, anatase and rutile, depending on the particle size of titanium dioxide.

The amount of organic surface-suspending agent was limited by the amount of organic surface-suspending agent used and the substitution ratio, and the amount of TiO 2 used in the surface-suspending agent and substitution was adjusted. In order to compare with the surface- Mass ratio, and usage.

First, in order to investigate the depth distribution of titanium in the method of replacing photocatalyst, the mass ratio was measured in units of 0.33 mm on the concrete surface, and the total depth was measured up to 3 mm.

As shown in Fig. 14, 100% of titanium was not detected on the surface and only about 70% of titanium was detected.

More than 100% of titanium was detected at the surface of 1.33 mm.

It can be seen that the photocatalyst is not efficiently distributed relative to the amount used, and similar results are obtained at different depths.

On the other hand, among the penetration methods using the surface penetrant shown in the present invention, the results of titanium detection in the case of using the photocatalyst P-25 are as shown in FIG.

To determine the penetration depth of P-25 on the concrete surface, the mass ratio was measured in units of 0.33 mm and measured up to 3 mm as in the substitution formula.

Titanium showed a result of 0.33mm to 70%, showing a slight decrease of titanium away from the surface.

Titanium was not detected at a distance of 2.66 mm from the surface.

Titanium was uniformly detected from the surface to 2.33 mm, which is considered to be easy to penetrate into the mortar when the particle size is 25 nm.

Therefore, it is considered that it has penetrated to a suitable depth for application to concrete pavement.

In addition, when the surface penetrant and the photocatalyst CR-57 were used, the results shown in Fig. 16 were obtained.

In EDAX analysis, the mass ratio of titanium was detected.

To determine the penetration depth of CR-57 on the concrete surface, the mass ratio was measured in units of 0.33 mm and measured up to 3 mm as in the substitution formula.

The mass ratio and the amount of titanium used were detected as 261% at the distance of 0.33 mm from the surface, 152.5% at 0.66 mm, 52.5% at 1 mm, 46.5% at 1.33 mm, 20% at 1.66 mm and 10% at 2 mm.

In the case of CR-57, the most ideal penetration distribution is shown in FIG. 16, and it is considered that the penetration is the highest on the surface due to the particle size of CR-57.

Since penetration depth of CR-57 is 2.33mm, sufficient penetration depth of TiO2 even after wear of road surface due to the common use of pavement when applied to concrete pavement makes it possible to sufficiently contact with wide atmosphere, .

As described above, the composition for impregnating concrete using the surface penetrant according to the present invention and the method for constructing the concrete road structure using the same can secure the proper depth of penetration of the photocatalyst, ensure economical efficiency, It can be confirmed that even when the wear of the road starts, a sufficient nitrogen compound (NOx) removal effect can be exerted.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

Claims (9)

65 to 75% by weight of a liquid type silicate-based surface penetrant;
25 to 35% by weight of the photocatalyst, based on the weight of the surface penetrant,
A method for constructing a concrete road structure using a concrete impregnating composition,
The photocatalyst is titanium dioxide (TiO ₂ )
Wherein the surface impermeant is an organic surface impermeant,
Mixing the surface impregnant with the photocatalyst to form the concrete impregnating composition; And
Impregnating the surface of the concrete with the concrete impregnating composition;
Wherein the method comprises the steps of:
delete The method according to claim 1,
The titanium dioxide (TiO ₂ )
Wherein the composition is one of anatase and rutile or a mixture of two or more of the anatase and rutile.
delete delete delete The method according to claim 1,
The impregnating step
Wherein the composition for impregnating concrete is sprayed onto the surface of the concrete.
The method according to claim 1,
The impregnating step
(10 to 30 占 폚). The method for constructing a concrete road structure using the composition for impregnating concrete.
The method according to claim 1,
The impregnating step
Wherein the concrete is impregnated with the concrete impregnating composition at the time when the water on the concrete surface is dried when the concrete is not hardened.

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