KR101022413B1 - The functionalconcrete block purficating the air and water - Google Patents

Abstract

PURPOSE: A functional concrete block is provided to continuously maintain atmosphere and water purification while minimizing the used amount of optical catalysts and to ensure deodorization, water retention, soundproof property, antibacterial property, and far-infrared radiation. CONSTITUTION: A functional concrete block comprises 100~110 weight% of Portland blast furnace cement, 150~165 weight% of coarse aggregate, 140~150 weight% of fine aggregate, 15~20 weight% of porous material powder, 4~8 weight% of admixture, and 25~30 weight% of water-curable reaction water. The surface of the molded functional concrete block is coated by a liquid water-curable composition including 5~8 weight% of photocatalyst particles, 4~6 weight% of microsilica or pozzolana, 3~4 weight% of calcium oxide, 1~2 weight% of dispersing agent, 0.5~1 weight% of silane coupling agent, and 2~3 weight% of potassium silicate or sodium silicate aqueous solution.

Description

The functional concrete block purficating the air and water

The present invention relates to a functional concrete block having an air and water purification action. Specifically, the body of the block has a thermal insulation, soundproofing, deodorizing property, antibacterial activity, far-infrared radiation function in the air by the addition of a porous material, and conservativeness in water. It has a water purification function by adsorption or filtration, and the surface of the block is coated with a water-curable composition containing a photocatalyst, and thus a functional concrete block having both an air purification function and a water purification function by an organic matter decomposition function.

In the present invention, the porous material is a powder of charcoal, illite, pearlite, obsidian, jangho stone, volcanic stone, vermiculite, and shale, which are porous and lightweight. In addition, a coating layer having excellent air and water purification functions on a block surface may be a layer obtained by coating and curing a coating liquid formed of a photocatalyst or a photocatalyst-carrying material or a photocatalyst ore powder onto a block surface.

Recently, Korea has achieved remarkable industrialization, but it is also true that side effects caused severe environmental pollution. In the case of water quality, chemical oxygen demand (COD) and biological oxygen demand are serious, and various wastewater contains organic and inorganic substances harmful to the human body.In particular, the cost of treating sludge by flocculating nitrogen oxides, phosphorus compounds, and suspended solids. This is also enormous, and the sludge volume is increasing at a high rate each year.

In addition, even in the case of air pollution, it is exposed to various volatile organic compounds (VOC), nitrogen oxides, sulfur oxides, and other harmful gases by using synthetic resin materials, synthetic resin adhesives, and synthetic resins in offices and residential living spaces. A lot of diseases and atopic dermatitis are occurring.

Therefore, it is a very effective way to apply concrete materials to concrete products that can decompose or reduce pollutants in the air or water using concrete that has frequent contact between water and air as structures. Methods for imparting mitigation are already being studied in this context, and their products are also on the market.

Among them, the photocatalyst is a photocatalyst that can decompose various organic matters and microorganisms by light, and is a substance that can decompose air pollutants or water pollutants using only solar energy without introducing other energy from the outside.

Such photocatalyst has been researched to apply to building materials such as concrete, atmospheric purification and water purification since the mid-1990s because of its unique self-purifying ability.In Japan, photocatalyst concrete industrialization has been established. It is actually installed in roads such as Tokyo and Saitama to help clean the air of the city. However, Korea is still being studied at the experimental level, and concrete and building exterior materials with photocatalysts are introduced, but constant research and development are urgently required before they can be used and activated.

Looking at the prior art in the technical field related to the present invention,

Korean Patent Publication (Registration No. 942990) discloses a description of the method for the production of a mortar for forming a concrete structure and its structure using porous porous particles, which are ultrafine photocatalyst micropowders in porous particles including charcoal particles. Method for manufacturing concrete mortar for forming a concrete structure using functional porous particles added to concrete mortar formed by cement and aggregate additive hydrosetting reaction by adjusting photocatalytic coated porous particles coated with As a related technology, the porous particles coated with photocatalyst fine powder are present in a uniformly dispersed state throughout the concrete mortar forming the concrete structure, so that the porous material and the photocatalyst can have the purpose of lightening, water purification and air purification. Soundproof, deodorization, antibacterial, sterilization, Decomposition and removal of organic compounds are given to concrete structures, but in particular, photocatalysts are exerted by the energy of sunlight, so photocatalysts dispersed in concrete structures that are not penetrated by sunlight cannot actually function. In addition, the photocatalyst dispersed in the surface layer is also attached to a porous material such as charcoal, so the deterioration due to the desorption loss of the photocatalyst is also to be considered.

As such, more efficient design is required in applying the photocatalyst to the concrete structure.

In addition, Korean Patent No. 935128 introduces the technical content of "photocatalyst coating composition comprising titanium dioxide coated with hydroxyapatite having water repellency and atmospheric purification function".

A photocatalyst coating composition for applying such a photocatalyst coating composition to a concrete secondary product, specifically 1-10% by weight of titanium dioxide coated with hydroxyapatite, and an aqueous emulsion binder prepared by copolymerizing polysiloxane and acrylic resin. A photocatalyst paint composition consisting of weight percent, thickener 0.1 to 0.5 weight percent, dispersant 0.1 to 5 weight percent, preservative 0.1 to 10 weight percent, and water 85.5 to 97.7 weight percent, an aqueous emulsion binder, thickener, dispersant, preservative, etc. The photocatalyst coated with apatite with an organic compound is coated and bonded.

It is thought that the photocatalyst has a function of decomposing the organic compound itself by light energy, and thus the organic coating layer may be vulnerable as time passes.

In addition, since the coating layer of heterogeneous synthetic resin including a photocatalyst is formed on the concrete surface, the function of deodorizing and water-retaining moisture control due to the porosity of concrete itself is also impaired.

Conventional techniques applying the photocatalyst to concrete products are contents developed by Daemyung Contec Co., Ltd., the applicant of the present application, and pointed out that various problems have been produced to date.

The present invention is a complementary invention that improves the problems of the prior art of applying a photocatalyst to concrete products, and is designed to derive an effective effect while minimizing expensive photocatalysts in applying the photocatalyst to a concrete secondary product and the photocatalyst to secondary concrete. It should be designed to not interfere with the original function of concrete by applying it to the product. Finally, it is to provide a porous concrete block having air and water purification function that is maintained for a long time while various functions and functions of the photocatalyst are effectively exhibited.

At least one porous material selected from charcoal, illite powder, pearlite, obsidian powder, jangho stone powder, volcanic stone powder, vermiculite powder and shale powder in concrete composition composed of blast furnace slag cement, coarse aggregate, fine aggregate and additive Simultaneously to form a concrete block by adding a material having a photocatalyst, 5 to 8 wt% of photocatalyst particles, 4 to 6 wt% of microsilica or volcanic ash, 3 to 4 wt% of calcium oxide, 0.5 to 1 wt% of silane capping agent, and 1 to 1 dispersant. It is possible to achieve the object of the present invention by providing a porous block by applying a water-curable coating composition of 2wt%, the remainder of the 2-3% by weight aqueous solution of girly or soda silicate.

The concrete block according to the present invention can continuously maintain the water purification and atmospheric purification while minimizing the amount of photocatalyst and efficiently exhibiting the effect of the photocatalyst, and the photocatalyst coating layer is composed of a hydrocurable composition that is identical to the block body. It can be said to be a functional block having the air and water purification action that retains the versatility, water retention, soundproofing, antibacterial, and versatility of far-infrared radiation function by properly exerting the function of.

The present invention provides various functionalities to the body of the concrete block, while minimizing the use of expensive photocatalyst in applying the photocatalyst to the concrete block, it is possible to efficiently derive the effect of the photocatalyst as well as to maintain the photocatalytic effect in the long term. The present invention relates to a multifunctional concrete block having an air and water purification function, specifically 100 parts by weight of blast furnace slag cement, 150 to 165 parts by weight of coarse aggregate, 140 to 150 parts by weight of fine aggregate, and 4 to 8 parts by weight of admixture as an additive. , 25 to 30 parts by weight of the hydrocuring reaction water was added to the solid concrete composition composed of 15 to 20 parts by weight of the porous material powder, and at the same time, 5 to 8 wt% of the photocatalyst particles, microsilica or 4 ~ 6wt% of volcanic ash (pozzolane), 3 ~ 4wt% of calcium oxide, 0.5 ~ 1wt% of silane capping agent, and 1 ~ 1.5wt% of dispersant. The present invention relates to a functional concrete block having an atmospheric and water purification action by coating a hydraulic composition composed of an aqueous solution of li or soda silicate and curing the liquid integrally.

The porous powder particles added to the concrete block of the present invention have fine pores, light weight concrete blocks, and sound insulation, thermal insulation, deodorization, and antimicrobial properties. Deodorizing and antimicrobial properties at the same time, tourmaline, volcanic stone powder is a material known as anion generating material.

In the present invention, the photocatalyst is the first photocatalyst was discovered by the fact that water decomposes hydrogen and oxygen when irradiated with TiO ₂ single crystal electrode.

Photocatalysts are semiconducting oxides such as ZnO, Cds, WO ₃ , SrTiO ₃ , Cdse, KNbO ₃ , TiO _2, etc., and when they receive light above the band gap energy, the valence band electrons are transferred to the conduction band. To generate electrons (e-) and holes (h +), which in turn combine with O ₂ and H ₂ O molecules in the atmosphere to form superoxides (O _2- ) and hydroxide ions (OH-) that have strong organic decomposition Titanium dioxide (TiO ₂ ) among these catalyst oxides has a band cap energy band over a generation potential region of hydrogen and oxygen, which enables the oxidation / reduction reaction of water simultaneously. This means that it is possible to simultaneously generate superoxide and hydroxide ions, two pollutant decomposers of photocatalysts, which can decompose a wider variety of materials than those capable of either oxidation or reaction reactions. In addition, since TiO ₂ is chemically stable, has excellent chemical resistance, and is non-toxic and harmless to humans, photocatalytic particles applied to concrete blocks also have titanium dioxide (TiO ₂₎ in terms of functionality and stability. The coating composition composed of) will be applied to the concrete block.

Titanium dioxide as a photocatalyst particle applied to the concrete block is anatase-type titanium dioxide fine powder, titanium dioxide ore, anatase (fine anatase) fine powder, titanium dioxide-supported charcoal powder, titanium dioxide supported pearlite, titanium dioxide supported vermiculite It is applied to concrete blocks in the form of powder, apatite-coated titanium dioxide powder.

As the photocatalyst particles, anatase is a titanium ore, and its chemical composition is TiO ₂ , which is light yellow or brown in the form of tetragonal, jujube, monolith, or plate-like crystal system. It is an anatase type titanium ore that has a strong decomposing function of organic matter, and it is ilmenite ((Fe, Mg) TiO ₃ ) which is a titanium iron ore, and a titanium which is a brookite type and a rutile type titanium ore (TiO ₂ ) There is a big difference from titanium ore without organic decomposition.

In addition, the method of supporting the photocatalytic particles on porous particles such as charcoal, pearlite and vermiculite powder has a particle size of 1 to 4 wt% or less of 100 mm of anatase-type titanium dioxide or titanium dioxide ore (anata zeolite), and a surfactant (CTAB) 1 to 3 wt%. % Was added to 93-98% distilled water and ground at 40Mhz with homo-nitrite, which was left at room temperature for 2 hours or more to prepare a dispersion, and the photocatalyst (titanium dioxide) was dried by dipping and drying the porous material in this dispersion. ) Supported porous particles can be obtained.

In apatite-coated titanium dioxide, apatite can be represented by the molecular formula Ca (PO ₄ ) ₅ X ₂ and classified according to the terminal group represented by X. When X is a hydroxy group (OH-), it is hydroxy apatite and X is In the case of fluorine group (F-), it is apatite fluoride; in the case of chlorine group, it is apatite chloride.

The hydroxyapatite contains a phosphoric acid component and itself has an OH group, which has hydrocurability. Also, the phosphoric acid is combined with titanium dioxide silicon dioxide and the like to exhibit hydrocurability. Thus, the titanium dioxide photocatalyst coated with apatite is hydrated. It is integrated with the surface of the block by the hydrocuring reaction with other materials containing the hydraulic composition and the concrete composition on the surface of the block.

Here, the apatite (Ca ₁₀ (PO ₄ ) ₆ X ₂ ), which is advantageous for the hydrocuring reaction, is selected and used as the apatite (Ca ₁₀ (PO ₄ ) ₆ (OH ₂ )) having a hydroxyl group.

In addition, the photocatalyst particles are a composition for forming a hydraulic composition as described above, and volcanic ash (pozzolane) does not have a property of curing by cement chemical phase itself, but is gradually incompatible with calcium hydroxide added to the composition and calcium hydroxide liberated from the block body. It is a substance having a silica component as a main component to produce a compound having hydraulic properties.

Micro-silica has the function of replacing 3 ~ 4 times cement per unit usage of micro-silica, and acts as a hydration accelerator of cement and is a spherical particle having a particle size of several μm or less.

In the cement hydration reaction, the pozzolanic reaction requires calcium hydroxide (Ca (OH) ₂ ). In the absence of micro-silica, calcium hydroxide is present in large chunks and is relatively strongly attached to small particles, which inhibits the chemical reaction to the next step. When microsilica is contained, the microsilica breaks down and disperses the lump of calcium hydroxide so that the calcium hydroxide becomes more active in the pozzolanic reaction, thereby promoting the overall cement hydration reaction.

Alkali silicates are used as inorganic binders in aqueous solutions. Originally, glass and cement hardeners have deep structural and structural relationships. Alkali silicates are both glass and cement. Alkali silicate is usually used in the form of water glass, which is cured by drying the silicic acid, so that sodium silicate can be cured in combination with inorganic and organic materials, so that it is possible to harden and bond the hydraulic compositions to the convex. have.

In addition, the silane capping agent having an amino group, an epoxy group, or a double bond functional group is a capping agent that bonds an organic material and an inorganic material or an inorganic material and an inorganic material to significantly improve the bonding strength.

In the present invention, by using only the surface of the block without using a photocatalyst on the entire body of the concrete block as described above, it is possible to derive the effect of the photocatalyst to the maximum while minimizing the use of expensive photocatalysts, and also as a photocatalyst to a concrete and a heterogeneous synthetic resin It is a paint composition that is coated with a hydraulic composition composed of homogeneous hydrocuring reaction materials such as concrete without coating on the concrete block, and is strongly bonded to the homogeneous concrete block surface to integrate it. The purpose of the present invention is to provide a concrete block that can exhibit deodorant, water retention, and moisture control functions without being hindered by heterogeneous coating film such as synthetic resin.

For example, the function and action of the concrete block according to the present invention will be described.

In Example (1) is a composition outside the scope of the concrete body composition of the present invention was formed by replacing the concrete block body composition and the fine granules instead of the porous material according to the addition of the porous material as the present invention concrete block composition Table (1) and The specimens were fabricated and measured for repair function, compressive strength and water purification function.

Specimen according to the concrete composition (5cm × 5cm × 5cm). Unit: parts by weight Composition
＼
Specimen Blast furnace slag cement
Coarse aggregate
Fine aggregate Porosity
matter Admixture
(Lignin sulfonate)
water
weight B-1 100 165 150 10 5 25 455 B-2 105 160 145 15 5 25 455 B-3 110 155 140 20 5 25 455 B-4 100 165 160 0 5 25 455 B-5 105 160 160 0 5 25 455 B-6 110 155 160 0 5 25 455

Specimens B-1 to B-3 according to the concrete composition are the specimens belonging to the range of the concrete block composition of the present invention and specimens B-4 to B-6 are the concrete compositions outside the range of the concrete block composition of the present invention. It may also be referred to as a composition.

The coarse aggregate used in the specimens of Table (1) uses crushed aggregate uniformly distributed in the range of 5 ~ 13mm, fine aggregate is fine aggregate distributed uniformly in the range of 0.1 ~ 5mm and porous material is char of 1mm ~ 0.07mm size Particles were used, and lignin sulfonate was used as a admixture.

In order to determine the compressive strength of the specimens of Table 1, the compressive strength was tested while applying pressure at a speed of 0.6 ± 0.4 MPa using UTM as shown in KSF 2405. As a result, the compressive strength of the specimens was obtained as shown in Table (2). It can be seen that the compressive strength decreases rapidly as the amount of charcoal is increased and the specimen strength without charcoal is high.

This result is considered to be a relatively low strength charcoal lower the compressive strength because it has a porous structure.

Compressive strength measurement result table (unit MPa) of specimens of table (1). Standard Classification 4 days 28 days B-1 41.4 51.1 B-2 27.6 34.2 B-3 20.1 25.6 B-4 44 54.2 B-5 43.8 53.8 B-6 44.4 54.5

The specimens (B-1) to (B-3) of Table 2 have the lowest compressive strength of char as compared to the specimens produced within the range of concrete block composition with other porous materials. Other porous materials are in the range of 30% increase in the compressive strength of charcoal when added under the same conditions.

In addition, the water absorption test was conducted to find out the amount of the specimens absorbed and stored in the table (1), that is, water retention. In the case of water absorption test, the cube specimen cured for 28 days was dried for 48 hours at 110 ± 5 ℃, weighed and soaked for 48 hours, then taken out and wiped with a dry towel. The weight was again measured. The water absorption test results are shown in Table (3).

Absorption rate test result of the specimen of Table (1). Item ＼ B-1 B-2 B-3 B-4 B-5 B-6 Dry weight (g) 239.3 224.2 213.9 254.5 252.6 249.4 Wet weight (g) 271.3 260.9 256.9 278.3 277.5 276.7 Water absorption (g) 32 36.7 43 23.8 24.9 27.3 Unit weight
Sugar absorption rate (%) 12.5 16.4 20.1 9.3 9.9 10.9

Examining the experimental results in the above Table (3), the specimens B-1 to B-3 to which the porous material charcoal was added as a composition had a water absorption rate per unit weight, that is, to the specimens B-4 to B-6 without charcoal. As the water retention is excellent and the amount of charcoal is increased, the water retention (water absorption rate) is rapidly increased.

However, when the porous material is used over the composition range of the concrete composition of the present invention, the strength of the concrete becomes weak, which causes problems in strength.

Next, the water purification performance of the specimens B-1 to B-4 was evaluated. For water purification performance test, 100g of the specimens were pulverized, put into 400ml Erlenmeyer Place, and 150ml of prepared contaminated water was put into the flask, and the flask was sealed and left in a thermostat at a temperature of 20 ± 1 ℃ for 7 days.

Chemical oxygen demand (COD), total nitrogen (T-N), and total phosphorus (T-P) were measured as indicators for evaluating water purification performance, and the results are shown in Table (4).

Water Purification Performance Evaluation of Test Specimen Body in Table (1).
Category＼Item COD (mg / L) T-N (mg / L) T-P (mg / L) Early 7 days Early 7 days Early 7 days B-1
168.3 128
15.1 13.8
3.99 2.4 B-2 126.6 13.4 2.3 B-3 121.9 12.8 2.27 B-4 140.6 14.2 2.65

As a result of the water purification performance test, it was found that the deceleration range of COD, TN, TP, etc. increased as the body char was added in the specimens (B-1) to (B-3). Deceleration widths such as COD, TN, and TP are smaller than those of char-coated specimens.

However, the water purification function of the specimen of the present invention, the concrete body composition can not be expected significantly compared to the concrete composition to which the photocatalyst (TiO ₂ ) is applied.

Up to now, various functions related to the specimen by the concrete body composition were examined.

Next, the photocatalyst dispersion composition comprising the photocatalyst dispersion hydraulic composition (liquid) coated with the present invention hydraulic reactant on the specimen B-3 of the present invention and the synthetic resin (acrylic resin) on the specimen B-3 with the colorant (liquid) ) And the performance was compared by comparing the specimen C-2 coated.

(1) The photocatalyst hydraulic coating composition (liquid) of the present invention (hereinafter referred to as C1).

A photocatalytic hydraulic coating composition for block coating comprising 5 wt% of photocatalyst particles, 6 wt% of volcanic ash (pozzolane), 3 wt% of calcium oxide, 0.5 wt% of silane capping agent, 1 wt% of dispersant, and 82.5 wt% of potassium aqueous silicate solution of 2 wt%.

(2) A photocatalyst composition (liquid) using synthetic resin as a coloring material (hereinafter referred to as C2).

(Domestic Registration Patent Publication No. 10-0935128)

5% by weight of titanium dioxide coated with hydroxyapatite, 5% by weight of aqueous emulsion (acrylic resin) binder, 0.3% by weight of thickener, 1% by weight of dispersant, 3% by weight of preservative, and 85.7% by weight of water Paint composition.

Photocatalyst particles used herein use particles in the range of 10 nm to 200 nm. If the particle size is less than 10nm, the light-receiving ability to absorb light as a photocatalyst is inferior. If the particle size is more than 200nm, dispersibility is inferior and there is a tendency to detach after coating.

The compositions C1 and C2 were coated with 0.5 mm thickness on specimen B-3 to prepare specimens C-1 and C-2, and the atmospheric and water purification functions were examined.

In table (5), to check the water pollution indicators of specimens C-1 and C-2, the contaminated water was filled up to 10ℓ in a 20 liter capacity container, and 10 specimens of C-1 and C-2 were loaded, respectively. During the 28 days at 1 ℃ temperature, the chemical pollution demand (COD), total nitrogen (TN), total phosphorus (TP) water pollution indicators were observed to determine the state over time.

Changes in Water Pollution Index of Specimen C-1 and C-2. Category＼Item COD (mg / L) T-N (mg / L) T-P (mg / L) Early 7 days 28 days Early 7 days 28 days Early 7 days 28 days C-1
142 69.3 56.1
12.04 8.3 7.7
2.68 0.46 0.249 C-2 72.8 58.9 8.7 8.09 0.48 0.26

In the above table, the specimen of C-1 is a specimen coated with C1, which is a photocatalyst hydraulic coating composition coated on the surface of the concrete block of the present invention, on the specimen B-3 made of the composition for molding the concrete block body of the present invention, and the concrete corresponding to the present invention. The block of C-2 may be called a concrete block coated with the coating composition C2 using a synthetic resin (acrylic resin) as a colorant on the specimen B-3. Comparing specimen C-1 and specimen C-2, there is no significant difference in reducing COD, TN, and TP of water pollution indicators, but the water purification function of specimen C-1 is improved compared to specimen C-2. .

Table (6) also examined the methylene blue decolorizing ability of specimens C-1 and C-2.

In order to evaluate the denitrification ability, 10 specimens of C-1 and C-2 were added to 10 l of methylene blue 2.4 mg / L solution, and the containers were rotated for 40 minutes. The concentration change of methylene blue was measured and evaluated by using an ultraviolet and visible spectrophotometer.

Methylene blue discoloration ability according to concrete composition. Item ＼ Classification C-1 C-2 Methylene blue concentration after 40 minutes
(mg / L) 0.542 0.855 Methylene blue adsorption amount
(mg M / g Concrete) 0.022 0.016 Methylene Blue Adsorption Rate
(mg MB / L-min) 0.057 0.047

In addition, Table (7) is an air purification performance evaluation table of specimens C-1 and C-2. In order to evaluate the air purification performance, acetaldehyde (CH) was irradiated with UV light for 20 hours according to the gas bag B method proposed by the Korean Photocatalyst Association. ₃ CHO) degradation efficiency was evaluated. This method is to evaluate the contaminant decomposition performance of adsorbent photocatalyst samples such as concrete.In the test method, 10 specimens are placed in a 5L gas bag and 3L of acetaldehyde / air mixed gas is injected. Allow at least 5 hours to equilibrate the acetaldehyde concentration between the sample and the mixed gas, and then observe the change in acetaldehyde concentration for about 20 hours while irradiating UV light with a wavelength of 10mW / ㎠ and UV-A for about 20 hours. Evaluate the performance.

Acetaldehyde Decomposition Efficiency by Gas Bag B Method of Specimen C-1 and C-2. division\ Initial concentration
(ppm) Concentration after 2 hours (ppm) Concentration after 10 hours (ppm) Concentration after 20 hours (ppm) Removal rate
(%) Specimen C-1 120 68 106 119 99.2 Specimen C-2 120 52 97 116 96.7

In addition, we evaluated the removal efficiencies of benzene, toluene, and xylene (Xylen) to evaluate the elimination of other evaporative organic compounds (VOC). The experiments were carried out on the same conditions by the gas bag B method with specimens C-1 and C-2. There was no significant difference with acetaldehyde decomposition efficiency.

In addition, in order to perform the deodorization test of specimens C-1 and C-2, ammonia gas was added in accordance with the KICM-FIR-1004 method to obtain a table (8) and test results. Here the experiment is done in the dark room.

Deodorization test result of specimen. Division＼hour (minutes) 0 30 60 90 120 Deodorization rate (%) C-1 Initial concentration
160 ppm 118 64 32 13 92 C-2 120 88 64 43 73

The results of water purification of Table (5) and the results of Tables (6) and (7), and the results of decomposition and decomposition of VOC-generating materials, were obtained by the function of the photocatalyst coated on the specimens. Compared with C-1 and C-2, there is no big difference, but both have excellent water purification and air purification ability.

On the other hand, in the deodorization test results of the specimen as shown in Table (8), the specimen C-1 coated with the composition C1 on the block body formed of the concrete block body composition of the present invention has a deodorizing effect compared to the specimen C-2 coated with the coating composition C2. Can be remarkably excellent.

Although specimen C-1 and specimen C-2 have the same body composition, the effect difference of the deodorizing function may be attributed to the difference between the coating compositions C1 and C2.

Deodorization function by adsorption can be said to be exhibited by the porous material constituting the inner body of the specimens C-1 and C-2. The functional difference as described above is that the coating composition layer on the surface of the specimen C-2 is a synthetic resin (acrylic resin). ), And the deodorizing function is deteriorated because the air passage of the body micropores of specimen C-2 is impaired due to the coating layer using the colorant.

As described above, the concrete block of the present invention has the excellent water purification and atmospheric purification while minimizing the amount of photocatalyst, and the photocatalyst coating layer is composed of the body and the homogeneous hydrocurable composition. It is a functional concrete block with air and water purification function that has various functions such as deodorization, water retention, sound insulation, heat insulation, antibacterial, far infrared radiation function by showing the function properly. It is a functional concrete block that can be widely used as a sidewalk block.

Claims (5)

100-110 parts by weight of blast furnace cement, 150-165 parts by weight of coarse aggregate, 140-150 parts by weight of fine aggregate, 15-20 parts by weight of powder of porous material and 4-8 parts by weight of solidified concrete block composition 25-30 parts by weight of water is added to form a concrete block while simultaneously forming photocatalyst particles 5-8 wt%, microsilica or volcanic ash 4-6 wt%, calcium oxide 3-4 wt%, dispersant 1-2 wt%, silane A functional concrete block having an atmospheric and water purification action by coating a liquid hydrocuring composition composed of 0.5 to 1 wt% of a capping agent and 2 to 3 wt% of an aqueous solution of girly or soda silicate.
The functional concrete block according to claim 1, wherein the porous material powder is at least one porous material powder selected from charcoal, pearlite, illite, obsidian, jangho stone, volcanic stone, vermiculite and shale. .
The method of claim 1, wherein the photocatalyst particles are selected from anatase-type titanium dioxide fine powder, anatase (anata zeolite) powder, titanium dioxide-supported charcoal powder, titanium dioxide-supported pearlite, titanium dioxide-supported vermiculite powder, and apatite-coated titanium dioxide powder. Functional concrete block having air and water purification, characterized in that the at least one photocatalyst particles.
_{4. The} functional concrete block according to claim 3, wherein the apatite (Ca ₁₀ (PO ₄ ) ₆ X ₂ ) is hydroxy apatite (Ca ₁₀ (PO ₄ ) ₆ (OH) ₂ ). .
The method of claim 1, wherein the concrete block is a functional concrete block having air and water purification, characterized in that the concrete block is selected from the split block, vegetation protection block, vegetation retaining wall block, front block, sidewalk block.