KR100952205B1 - Additive Composition for a Water Retainable Pavement - Google Patents

Abstract

The present invention provides active additives including active carbon, epochite, superabsorbent resin, and fiber, and has a maximum water content of 4.0 kg / m ² or more. The composition can reach the maximum amount of water within a short time, and the maximum amount of water is 4.0 kg / m ² or more to have a minimum of about 1.5 days of water retention compared to the amount of latent evapotranspiration in summer.

Drainage asphalt, heat island, latent heat of evaporation, water retention, pavement, absorption rate, maximum water retention, maximum water absorption

Description

Additive Composition for a Water Retainable Pavement

The present invention relates to a water-based paving additive composition for paving by filling in an open asphalt matrix void. More specifically, the present invention relates to an additive composition for a water-retaining packaging containing active carbon, epochite, superabsorbent resin, and fiber, and having a maximum water content of 4.0 kg / m ² or more.

Recently, as urbanization and industrialization progress, the area of artificial ground in urban areas is increasing, and natural spaces such as green space and water surface are gradually decreasing. As the reduction of natural space increases solar radiation, and factors such as increase of artificial heat caused by automobile exhaust and air conditioners, local temperature rise in the downtown area, that is, heat island effect is frequently occurring.

The rapid rise in urban temperatures adversely affects the ecosystem and living environment, increases air pollution and acts as a factor in raising social overhead costs due to increased cooling power consumption. In particular, as the amount of fuel used increases, the amount of CO ₂ generated increases, thereby disturbing the water circulation of natural water due to global warming and loss of rainwater, thereby disturbing the global global natural circulation system.

In order to alleviate the heat island phenomenon in the city, various measures have been taken, such as rooftop greening, increase in vegetation area, and research on providing function to suppress radiant heat generation of artificial roads.

In particular, in the city center, since the relative area of the road is large and most of them are black close to the black body having high radiant heat, measures to alleviate the radiant heat of the road are urgently required. As a countermeasure, heat reflective roads that can reflect the infrared region of solar heat to reduce the radiant heat generation rate and water retainable roads that absorb water in the roads and cool radiant heat by latent heat of evaporation of water Research is ongoing.

Efficacy according to the suppression and cooling of the radiant heat generation rate of the road has been reported to reduce the surface temperature of the road by about 5 ~ 26 ℃, and lower the actual air temperature of about 0.1 ~ 0.8 ℃.

However, in a thermal road system, dust or contaminants adhere to the road surface over time, thereby reducing the reflectance of sunlight in the infrared region. Therefore, there is a problem that it is necessary to further strengthen the antifouling function on the road surface. On the other hand, in the case of a conservative road, as long as the water supply is smooth, there is an advantage that it is much more practical because the rate of deterioration of function over time is low.

FIG. 5 is a view schematically showing the structure of a conventional actual water-retaining asphalt, and FIG. 6 is a cross-sectional view showing a structure in which water-retaining materials are loaded into drainage asphalt, and the asphalt structure shown in FIG. The porosity of 25% is shown, and in the sectional view shown in FIG. 6, the conventional pavement is composed of a surface layer, a base layer, and a roadbed, and has water in the drainage asphalt concrete (surface layer) having voids. It has a structure in which a water-retaining material that can absorb water is charged into the voids. As shown in the drawings, the conventional conservative roads have been paved by utilizing organic or inorganic porous bodies so that the road structure can absorb rainwater or feed water.

Conventional water-retaining roads mainly use drainage asphalt using high viscosity modified asphalt having a porosity of 20 to 30%. In addition, a cement paste containing porous inorganic materials such as fly ash and silica, which can absorb water, has been packed by filling the drainage asphalt matrix pores.

In the conventional water-retaining road, the filled water-retaining cured cement absorbs rainwater or feed water, and then gradually evaporates water, thereby lowering the ambient temperature by latent heat of evaporation of water. As a result, a conservative road is required to absorb as much water as possible in a short time while ensuring different load resistance for driving a car.

In order to secure excellent water retention ability, the prior arts have tried to induce voids by appropriately combining a cement constituent of the water refining material with a blast furnace and a porous hydraulic hardener such as steelmaking slag, CaCO ₃ or amorphous silica. In some cases, a polymer absorber such as polyacrylate, polyvinyl alcohol, or polyacrylamide, which can partially absorb water, may be used in combination.

However, the structural analysis of the curing of the above techniques shows that there is not enough water diffusion path for easily absorbing and diffusing water, and the polymer absorber that stores water only in a closed cell is partially dispersed. There is only.

Repairing materials using the above techniques may be suitable for the concept of the maximum repair amount by prolonged water soaking for more than 24 hours, but in reality, it is suitable for the real road system which can only supply water for a short time using rainwater or feed water. I can't. Therefore, a situation that requires a repair concept of a practical concept that can absorb water more quickly.

It is an object of one embodiment of the present invention to provide a water-based water channel between the water pond (water pond) to provide a water-soluble packaging additive composition that can reach the maximum amount of water within a short time.

It is an object of another embodiment of the present invention to provide a water-retaining packaging additive composition having a water-retaining capacity of at least about 1.5 days relative to the amount of latent evapotranspiration in summer as a maximum water content of 4.0 kg / m ² or more.

It is an object of another embodiment of the present invention to provide a water-retaining cement paste comprising the water-retaining additive composition for packaging.

In order to achieve the above object, in the present invention, active carbon, active stone (Sepiolit), superabsorbent resin and fiber (Fiber), the water content is characterized in that the maximum water retention is 4.0 kg / m ² or more It provides a packaging additive composition.

The packaging additive composition according to the present invention forms a water channel between water ponds to provide a water-soluble packaging additive composition that can reach a maximum water repair amount within a short time. In addition, the maximum repair amount is 4.0 kg / m ² or more has the advantage of having a minimum of 1.5 days of repair capacity compared to the amount of latent evapotranspiration in summer.

The water-soluble packaging additive composition according to the present invention comprises active carbon, sepiolite and super absorbent polymer so as to have a maximum water content of 4.0 kg / m ² or more. . Through this, a water pond was formed in the road pavement, and a water channel connecting the water ponds was formed by using fibers to facilitate the diffusion and propagation of water. .

The water pond means that a porous inorganic material capable of storing and storing the absorbed water or organic polymer compounds capable of absorbing water exist in the form of pond in the cement hardened body.

The activated carbon is preferably a porous inorganic material having a large specific surface area and surface activity, and having a specific surface area of 900 to 1500 m ² / g. In FIG. 1, an enlarged photograph of the activated carbon particles is shown. Referring to FIG. 1, it can be seen that the activated carbon has a pore structure such as micro pores, transitional pores, and macropores.

Typically, the micropores have a diameter of 20 microns or less, transition pores 20 to 1000 microns and macropores of 1000 microns or more. At this time, it is known that the transition pores and the macropores have a function of absorbing and transferring water. Therefore, in the present invention, the porous activated carbon having excellent water absorption and transfer effect was selected as the main material for controlling water holding capacity and absorption rate.

In one embodiment, the activated carbon may be contained in 10 to 60% by weight based on the total weight of the packaging additive composition. If the content of the activated carbon is less than 10% by weight, the water absorbing ability and the water absorption rate of the repairing material are lowered. On the contrary, when the content of activated carbon exceeds 60% by weight, the floating amount of the upper portion of the paste during the cement paste manufacturing process is localized to the upper part of the cement cured body, thereby lowering the strength and increasing the curing delay effect. The disadvantage is that you can't.

In another embodiment, the activated carbon may be powder. This is because powdered activated carbon, which is excellent in easy filling, is preferable in order to improve fillability in the open asphalt pores.

Since the lysate has hydrophilic surface chemical properties, it rapidly wets upon contact with water in comparison with activated carbon and simultaneously absorbs and diffuses water absorbed through fibrous transition pores by capillary action. It will play a role.

In one embodiment, the lysate is preferably a fibrous molecular structure that has a specific surface area and can simultaneously function as an absorber and a fiber channel. Figure 2 below shows an enlarged view of the molecular structure of the vesicles according to an embodiment of the present invention. Referring to Figure 2, the haemulseok is a natural mineral having a fibrous structure, unlike the activated carbon it can be seen that the transition pores are mainly formed.

In one preferred example, the crypts may be porous fibrous inorganic materials having a specific surface area of 230 to 380 m ² / g, for example, hydrous magnesium silicate (Mg ₄ Si ₆ O ₁₅ (OH) ₂ -6H ₂ O May be).

In another preferred example, the crypts may be included in 10 to 60% by weight based on the total weight of the packaging additive composition. If the content of the vesicles is less than 10% by weight, the effect of the water is low since the water absorption and absorption rate of the repair material are low. On the contrary, when more than 60% by weight, the P lot value of the cement paste is lowered, thereby lowering workability, not only lowering the strength of the cement hardened body but also increasing the curing delay effect.

The superabsorbent resin is preferably a resin having excellent water absorption and low water loss in the cement alkali region. The "super absorbent polymer" generally refers to a known synthetic resin capable of absorbing a large amount of water 50 times or more than its own weight, and examples thereof include polyacrylate resins.

In one preferred example, the super absorbent polymer may be polymodified acrylate. The polymodified acrylate can absorb water of 50 to 100 times its own weight. In addition, unlike conventional polyacrylate-based resins, it is a superabsorbent polymer having a molecular structure with almost no negative effect of releasing water absorbed in the cement alkali region.

Conventional polyacrylate resins are polymer materials polymerized with an initiator by neutralizing caustic soda in acrylic acid. Such polyacrylate-based resins have a disadvantage in that shrinking occurs as water absorbed escapes into and releases into the cement alkali region in the alkali region of the slaked lime class such as cement. It will lose its function as an original absorber.

In contrast, the polymodified acrylate-based superabsorbent polymer according to one embodiment of the present invention is modified by unsaturated vinyl group with about 10 to 20% by weight of acrylic acid while adjusting the crosslinking density and caustic soda neutralization rate. The problem of releasing water absorbed in the cement alkali region was solved.

In one embodiment, the super absorbent polymer may be included in an amount of 1.0 to 10.0% by weight based on the total weight of the packaging additive composition. When the content of the super absorbent polymer is less than 1.0% by weight, the water absorbing ability and the rate of absorption of the water-retaining material are low, so there is almost no effect. On the contrary, in the case of more than 10.0% by weight, the P lot value of the cement paste is lowered, which lowers the workability and decreases the strength of the cement hardened body, and at the same time, increases the curing delay effect.

In addition, the fiber serves to absorb and propagate the absorbed water by forming an open cell by connecting water ponds in the form of a closed cell in the water retaining material.

In one embodiment, the fiber has a fiber length of 0.01 to 5.0 mm and may be in the form of a fiber chip. As the fiber, natural cellulose fiber, poly propylene fiber, nylon fiber or polyester fiber may be used.

In another embodiment, the fiber may be included in 10 to 60% by weight based on the total weight of the packaging additive composition. This, when the fiber content is less than 10% by weight, the efficiency of forming an open cell by connecting the water pond is lowered, when more than 60% by weight, the workability is deteriorated and the strength of the cement hardened body is reduced and the curing is delayed at the same time. .

The present invention also provides a cement paste comprising the above water-retaining packaging additive composition.

In one embodiment, the cement paste may include the water-retaining packaging additive composition, cement and water. Preferably, the water-based packaging additive composition may be contained in 0.5 to 50% by weight based on the weight of the cement. When the content of the additive composition is less than 0.5% by weight, the effect of improving water retention is lowered, and when the content of the additive composition is more than 50% by weight, workability is lowered and the strength of the hardened cement body is lowered.

For reference, the performance of the repair road is evaluated based on the absorption rate and the absorption rate of the hardened cement body. Hereinafter, the maintenance evaluation method for evaluating the performance of the conservative road will be described based on the Japanese standard.

The water-retaining standard of the water-retaining packaging of Japan is calculated | required by following formula (1) as "maximum water-retaining quantity" is 3.0 kg / m <^2> or more (t = 50mm reference | standard).

Here, the volume of the specimen is regarded as the volume of water to be 1 cm ² = 1 gram, the mass is the mass after immersion of the specimen for 24 hours, the dry mass is the mass after drying at 60 ℃ for 24 hours.

The maximum water capacity specification of 3.0 kg / m ² means the amount of water held per m ² of road pavement thickness of 50 mm, which means 3.0 mm / day in terms of daily rainfall.

3.0 mm / day, which is equivalent to the maximum water quantity standard, calculates the evaporation amount of moisture in the summer during the summer (July and August), and derives the theoretical efficacy duration as shown in Table 1 below. Table 1 shows the weather data of the Seoul area.

Average temperature Ground temperature Average humidity Precipitation (mm) Precipitation time (hr) Evaporation amount (mm) Wind speed (m / sec) January -2.5 -2.4 62.6 1.2 56.29 1.1 2.5 February -0.3 -0.3 61 0.2 48.4 1.2 2.7 In March 5.2 5.6 61.2 3.3 55.14 2.1 2.9 April 12.1 13.4 59.3 1.3 63.36 3.4 2.9 In May 17.4 19.7 64.1 5.2 72.15 4.1 2.6 June 21.9 24.8 71 3.3 82.21 4.2 2.3 In July 24.9 26.8 79.8 10.5 126.7 3.6 2.3 August 25.4 27.4 12.8 348 100.91 3.7 2.1 September 20.8 22.5 71 5.1 61.25 3.4 1.9 October 14.4 14.8 66.2 3.3 37.93 3 2 November 6.9 6.2 64.6 1.5 52.88 2.1 2.3 December 0.2 -0.1 63.8 0.7 45.7 1.4 2.3

(Founded: 1971-2000 average, Meteorological Agency)

The latent evapotranspiration amount (ET ₀ ) is calculated by the following equation.

Where ET ₀ (mm / day) is the latent evapotranspiration, Kp is the evaporation coefficient and Epan is the evaporation of the evaporator (mm / day).

At this time, in the case of non-greenery such as a road, the regression equation of the evaporation coefficient Kp is as follows.

Kp = 0.61 + (0.00341 x Relative Humidity)-(0.000162 x Wind Speed x Relative Humidity)-(0.00000959 x Wind Speed x Buffer Distance) + (0.00327 x Wind Speed x ln (Buffer Distance))-(0.00289 x Wind Speed x ln ( 86.4 Wind Speed))-(0.0106ln (86.4 Wind Speed) x ln (Buffer Distance)) + (0.00063 (ln Shock Distance) ² x ln (86.4 Wind Speed))

Here, if you calculate the average evaporation coefficient in summer (July-August),

Kp = 0.61 + (0.00341 x 78.6)-(0.000162 x 2.2 x 78.6)-(0.00000959 x 2.2 x 50) + (0.00327 x 2.2 x ln50)-(0.00289 x 2.2 x ln (86.4 x 2.2))-(0.0106ln (86.4 x 2.2) x ln50) + (0.00063 (ln50) ² x ln (86.4 x 2.2))

Kp = 0.676733 (at least 50 m buffer distance)

Therefore, ET ₀ = 0.676733 x 3.65 = 2.47 mm / day

In conclusion, the maximum repair amount of Japan's water-based asphalt is theoretically equivalent to the daily evaporation of water in summer.

Effective repair function of water-retaining asphalt repair material should speed up rainwater and feed water absorption to have a maximum water-retention capacity of 3.0 kg / m ² within about 1 hour.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the following Examples and the like are for illustrating the present invention, and the scope of the present invention is not limited thereto.

Example 1

 After 1000 parts by weight of water was added to the cement mixer, 30 parts by weight of activated carbon having a particle size of 60 mesh and a specific surface area of 1050 m 2 / g, 30 parts by weight of pulverized stone having a particle size of 16 mesh, superabsorbent resin of Sumitomo Chemical, Japan 2.5 parts by weight of Smica gel and 40 parts by weight of fiber (fiber length = 0.1 mm) manufactured by JRS, Germany were added and dispersed for about 15 seconds.

Then, 1000 parts by weight of general Portland cement was added and mixed for about 3 minutes to prepare a water-retaining cement paste.

 The p lot value of the prepared water-retaining cement paste was about 12 seconds on average, and a good value was obtained.

[Examples 2 to 6]

The water-retaining cement paste was prepared in the same manner as in Example 1, except that the composition of the active carbon, the calcite stone, the superabsorbent resin, and the fiber of the water-retaining material were changed as shown in Table 3 below.

Example 2 Example 3 Example 4 Example 5 Example 6 Water 1000 1000 1000 1000 1000 cement 1000 1000 1000 1000 1000 Activated carbon 10 20 50 60 100 meerschaum 10 20 50 60 100 Super Absorbent Resin One 2 3 4 5 Fiber 10 20 50 60 100 Total 2031.0 2062 2153 2184 2305

Comparative Example 1

1000 parts by weight of water and 1000 parts by weight of Portland cement were mixed and mixed for about 3 minutes to prepare a cement paste.

Experimental Example 1

Cement pastes prepared in Examples 1 to 6 and Comparative Example 1 were filled in a 4 × 4 × 16 cm mold. 24 hours were cured at room temperature and then demolded to determine the weight (deformation weight). Simultaneous specimens were immersed in a water bath for 24 hours and then weighed again. It was then dried in an oven at 60 ° C. for 24 hours and then weighed (dry mass).

Substituting the Equation 1 and 2 to calculate the maximum amount of water and the maximum absorption rate, the results are shown in Table 3.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Specimen Volume (cm ³ ) 256 256 256 256 256 256 256 Specimen Area (cm ³ ) 64 64 64 64 64 64 64 Demolding Weight (g) 371.2 374.2 372.3 368.9 368.1 362.4 373 Surface mass (g) 396.4 389.6 394.2 398.4 404.1 409.6 380 Dry mass (g) 198.6 231.2 228.5 191.2 187.8 176.5 286.3 Lot value (sec) 12.0 9.6 10.7 12.6 12.8 13.1 9 Maximum water capacity (kg / m ² ) 5.6 4.5 4.7 5.8 6.1 6.6 2.6 Maximum Absorption Rate (%) 77.3 61.9 64.7 80.9 84.5 91.1 36.6

Referring to Table 3, it was confirmed that the specimen containing the repair material according to the embodiment of the present invention improved the maximum repair amount and the maximum absorption amount from 1.5 times to 2.5 times more than the comparative example.

Experimental Example 2

In comparison with Example 1, the cement pastes prepared in Example 1 were respectively applied to actual roads. Specimens were taken from the constructed road and the absorbance was measured over time using the apparatus shown in FIG. 3. By measuring the amount of absorption over time, the rate of absorption can be calculated.

The apparatus shown in FIG. 3 is briefly described as follows. First, the sample holder 40 covered with the sponge mat 41 is installed in the water tank 20, and the specimen 10 for measuring the absorption amount is placed on the mounted holder 40. Then, the water 31 is filled through the water supply pipe 30 to the portion where the specimen 10 is submerged 0.5 cm, and then the absorption amount is measured by time.

The absorption time measurement results are shown in Table 4 and FIG. 4.

Minutes Comparative Example 1 Example 1  0 0 0  5 0.40 0.84 10 1.13 2.39 20 1.98 4.17 30 2.27 4.78 40 2.42 5.12 50 2.56 5.40 60 2.64 5.56

Referring to Table 5 and FIG. 4 below, it can be seen that the water retention amount of Example 1 is much higher than that of the Japanese standard 5.56 kg / m ² , and at the same time, the absorption rate is also significantly faster than that of Comparative Example 1. .

1 is an enlarged view of activated carbon particles according to an embodiment of the present invention.

Figure 2 is an enlarged view of the molecular structure of the vesicles according to an embodiment of the present invention.

3 is a schematic diagram of an apparatus for measuring the amount of absorption of cement specimens over time.

Figure 4 is a graph showing the results of a comparative experiment of the absorption of the cement specimens over time.

Figure 5 schematically shows the structure of the conventional actual construction of water-retaining asphalt.

6 is a cross-sectional view showing a structure in which a repair material is charged into drainage asphalt.

Claims (14)

Activated carbon; Sepiolit; Polyacrylate resin or polymodified acrylate resin; Fiber; The water-retaining packaging additive composition, characterized in that the maximum water retention is 4.0 kg / m ² or more. The method of claim 1, The activated carbon has a specific surface area of 900 to 1500 m ² / g, and is contained in 10 to 60% by weight based on the total weight of the packaging additive composition for a water-retaining packaging additive composition. The method of claim 1, The activated carbon is a powder (power), characterized in that the additive composition for repairable packaging. The method of claim 1, Said haemulseok stone is a water-soluble packaging additive composition, characterized in that the porous fibrous inorganic material having a specific surface area of 230 to 380 m ² / g. The method of claim 4, wherein Said haemulseok is hydrous magnesium silicate (Mg ₄ Si ₆ O ₁₅ (OH) ₂ -6H ₂ O), characterized in that the additive composition for water-retaining packaging. The method of claim 4, wherein Said haemulseok stone 10 to 60% by weight based on the total weight of the packaging additive composition for a water-based packaging additive composition. delete The method of claim 1, The polymodified acrylate-based resin is a water-retaining packaging additive composition, characterized in that it comprises a poly-modified acrylate in which 10 to 20% by weight based on unsaturated vinyl groups modified with respect to acrylic acid. The method of claim 1, The polyacrylate resin or the polymodified acrylate resin is 1.0 to 10.0% by weight based on the total weight of the packaging additive composition for a water-based packaging additive composition for repair. The method of claim 1, The fiber has a fiber length of 0.01 to 5.0 mm, the fiber chip (fiber chip) in the form of a water-repellent packaging additive composition. The method of claim 10, The fiber is a natural cellulose fiber, poly propylene (poly propylene) fiber, nylon (nylon) fiber or polyester (poly ester) fiber, characterized in that the additive composition for conservative packaging. The method of claim 10, The fiber is a water-based packaging additive composition, characterized in that contained in 10 to 60% by weight based on the total weight of the packaging additive composition. According to any one of claims 1 to 6, 8 to 12, Cement paste comprising a water-based packaging additive composition, cement and water. The method of claim 13, The water-based packaging additive composition is cement paste, characterized in that contained in 0.5 to 50% by weight based on the weight of the cement.

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