Concrete composition containing bacteria having a carbon dioxide adsorption mechanism, concrete coating material, and shotcrete construction method using the same

Abstract

To provide a concrete composition and a concrete coating material capable of improving the durability of a concrete structure and adsorbing carbon dioxide in the atmosphere regardless of light and dark conditions.SOLUTION: A composition comprises a cement-based inorganic binder and an aggregate mixture. The cement-based inorganic binder includes at least one of type-1 ordinary Portland cement, blast furnace slag, and fly ash. The aggregate mixture includes a normal aggregate, and a porous material impregnated with alkalophilic bacteria having a carbon dioxide adsorption mechanism and forming a glycocalyx. A coating material comprises a cement-based inorganic binder, an aggregate mixture, and a fiber material. The cement-based inorganic binder includes type-1 ordinary Portland cement, fly ash, blast furnace slag, and polymer powder. The aggregate mixture includes a fine aggregate and a porous material impregnated with alkalophilic bacteria having a carbon dioxide adsorption mechanism and forming a glycocalyx. The fiber material includes at least one of polyethylene and nylon.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a concrete composition for adsorbing carbon dioxide, a concrete coating material, and a shotcrete construction method using the same. More specifically, the present invention relates to a concrete composition, a concrete coating material, and a shotcrete construction method using the same, which have a carbon dioxide adsorption mechanism and contain bacteria that form a glycocalyx to adsorb carbon dioxide in the atmosphere.

Background Art

[0002] Recently, as the damage caused by climate change increases, the interest in reducing carbon dioxide, which is the cause of climate change, has been increasing. Therefore, various efforts have been made to reduce carbon dioxide across various industries. In particular, it is known that cement required for manufacturing concrete in the construction industry emits more than 0.8 tons of carbon dioxide every time 1 ton is produced. Therefore, the construction industry is making efforts to achieve carbon neutrality, which makes the net carbon dioxide emissions zero, just by emitting carbon dioxide.

[0003] In general cement, a carbonation reaction occurs in which calcium hydroxide (Ca(OH)2), which is a hydration product, reacts with carbon dioxide (CO2) to form calcium carbonate (CaCO3), and thereby, concrete that adsorbs carbon dioxide in the atmosphere can be manufactured. However, such a carbonation reaction has a problem in that it changes the pH of the cement to neutral, reduces the strength of the concrete structure, becomes a main cause of reinforcing bar corrosion, and significantly reduces the durability of the concrete structure.

[0004] In addition, it is possible to produce concrete that adsorbs carbon dioxide in the atmosphere by utilizing γ-C2S contained in slag, which is an industrial by-product generated during the production of stainless steel. However, this can also induce carbonation of cement and reduce the durability of concrete structures. Further, since the amount of γ-C2S generated during the production of stainless steel is significantly small, there is a problem that it is somewhat difficult to apply this technology to industrial sites.

[0005] As a result, there is an increasing interest in the development of technologies that maintain the durability of concrete structures and adsorb carbon dioxide in the atmosphere. For example, when a photocatalyst is coated on the surface of a concrete structure, it is possible to maintain the durability of the concrete structure and adsorb carbon dioxide in the atmosphere. However, a concrete structure coated with a photocatalyst can adsorb carbon dioxide in a strong ultraviolet environment, and when the surface coated with the photocatalyst is exposed to the outside, the coating surface may peel off or be easily damaged, and there is a problem of a short service life.

[0006] Therefore, it is necessary to develop a technology that maintains the durability of concrete structures and can adsorb carbon dioxide in the atmosphere even in an environment without strong ultraviolet rays.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] Therefore, an object of the present invention is to provide a concrete composition and a concrete coating material that improve the durability of concrete structures and can adsorb carbon dioxide in the atmosphere regardless of light and dark conditions.

Means for Solving the Problems

[0009] To achieve the above object, the concrete composition according to the present invention includes a cement-based inorganic binder containing at least one of one type of ordinary Portland cement, blast furnace slag, and fly ash; an aggregate mixture including general aggregates and a porous material impregnated with preferably alkaline bacteria having a carbon dioxide adsorption mechanism and forming a glycocalyx.

[0010] It may include 20 to 25 wt% of the cement-based inorganic binder and 75 to 80 wt% of the aggregate mixture.

[0011] The aggregate mixture may include 70 to 95 vol% of the general aggregates and 5 to 30 vol% of the porous material.

[0012] The bacteria may be one or more selected from the group consisting of Rhodobacter capsulatus, Rhodopseudomonas palustris, Rhodobacter blasticus, and Rhodobacter sphaeroids.

[0013] The bacteria may be one or more selected from the group consisting of Thermoproteus, Sulfolobus, Planctomyces, and Anammox.

[0014] The porous material may include at least one of expanded vermiculite, perlite, diatomaceous earth, and superabsorbent resin.

[0015] The porous material may be impregnated with the bacteria under negative pressure conditions.

[0016] The concrete coating material according to the present invention includes a cement-based inorganic binder containing one type of ordinary Portland cement, fly ash, blast furnace slag, and polymer powder; an aggregate mixture including fine aggregate and a porous material impregnated with good alkaline bacteria having a carbon dioxide adsorption mechanism and forming a glycocalyx; and a fiber material including at least one of polyethylene and nylon.

[0017] It may include 20 to 50 wt% of the cement-based inorganic binder and 50 to 80 wt% of the aggregate mixture, and may include 0.1 to 1 volume part of the fiber material with respect to 100 volume parts of the cement-based inorganic binder and the aggregate mixture.

[0018] The cement-based inorganic binder may include 30 to 40 wt% of the one type of ordinary Portland cement, 15 to 25 wt% of the fly ash, 40 to 50 wt% of the blast furnace slag, and 1 to 10 wt% of the polymer powder.

[0019] The polymer powder may be an ethylene vinyl acetate (EVA) resin.

[0020] The aggregate mixture may include 30 to 80 vol% of the fine aggregate and 20 to 70 vol% of the porous material.

[0021] The fiber material may have a diameter of 100 to 140 μm.

[0022] The shotcrete construction method according to the present invention uses any one of the concrete coating materials.

Effects of the Invention

[0023] The concrete composition and the concrete coating material according to the present invention have a carbon dioxide adsorption mechanism and contain bacteria that form a glycocalyx, which can improve the durability of concrete structures and adsorb carbon dioxide in the atmosphere regardless of light and dark conditions.

[0024] In addition, the concrete composition and the concrete coating material according to the present invention have a carbon dioxide adsorption mechanism and contain alkalophilic bacteria that form a glycocalyx. Even if the surface of the concrete structure is damaged, the bacteria present inside can sustain the carbon dioxide adsorption ability.

[0025] The concrete composition and the concrete coating material according to the present invention contain a porous material impregnated with bacteria and can create an environment in which bacteria can grow even inside the hardened concrete.

[0026] The concrete coating material according to the present invention is not only applicable to newly constructed concrete structures but also easily applicable to existing completed concrete structures. It is placed on the surface of the concrete structure in contact with the atmosphere and can enhance the efficiency of carbon dioxide adsorption.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0028] In the following description, it should be noted that only the parts necessary for understanding the embodiments of the present invention are described, and the descriptions of other parts are omitted as long as they do not depart from the gist of the present invention.

[0029] The terms and words used in this specification and claims described below should not be construed as being limited to their ordinary or dictionary meanings. The inventor should interpret them in accordance with the meanings and concepts that conform to the technical idea of the present invention in accordance with the principle that the concept of the terms can be appropriately defined in order to explain his invention in the best way. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. It should be understood that there can be various equivalents and modifications that can replace them at the time of this application.

[0030] Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The concrete composition according to the present invention includes a cement-based inorganic binder and an aggregate mixture.

[0031] The cement-based inorganic binder may include at least one of one type of ordinary Portland cement, blast furnace slag, and fly ash, and the aggregate mixture may include general aggregate and a porous material impregnated with preferably alkaline bacteria having a carbon dioxide adsorption mechanism and forming a glycocalyx.

[0032] Hereinafter, the configuration of the concrete composition according to the present invention will be described in more detail. The cement-based inorganic binder may be composed of only one type of ordinary Portland cement, but by replacing a part of one type of ordinary Portland cement with blast furnace slag and fly ash, the carbon dioxide emitted during the production process of one type of ordinary Portland cement can be reduced.

[0033] Blast furnace slag is an industrial by-product generated during the production of pig iron in a blast furnace of an ironworks. It has the effect of reducing the heat of hydration and also has potential hydraulicity that can improve the long-term strength of concrete structures. Although blast furnace slag itself has weak hardening properties, it has the property of being promoted to harden by the action of calcium hydroxide and sulfate, which are cement hydration products.

[0034] Fly ash corresponds to a fine powder form that is dissolved together with high-temperature combustion gas when pulverized coal using coal as fuel in a thermal power plant is incinerated at a high temperature and is collected by an electrical or mechanical current collector in a spherical particle shape due to surface tension during rapid cooling on the way to the chimney. When fly ash is added to a concrete composition, the curing time becomes slightly longer, but there are advantages such as the enhancement of the long-term strength of the concrete structure, the reduction of the heat of hydration, the suppression of the alkali-aggregate reaction, the resistance to sulfates, and the improvement of watertightness.

[0035] The aggregate mixture may contain 70 to 95 vol% of general aggregate and 5 to 30 vol% of porous material.

[0036] The general aggregate may include coarse aggregate and fine aggregate. Here, the coarse aggregate is an aggregate that remains on a 5-mm sieve at a weight ratio of 90% or more, and preferably, gravel can be used. The fine aggregate is an aggregate that completely passes through a 10-mm sieve and passes through a 5-mm sieve at a weight ratio of 90% or more, and preferably, sand can be used.

[0037] The porous material may include at least one of expanded vermiculite, perlite, diatomaceous earth, and superabsorbent resin, which have excellent cation exchange ability. At this time, the porous material may have a carbon dioxide adsorption mechanism and may be impregnated with good alkaline bacteria that form a glycocalyx.

[0038] When bacteria are simply added during the production of a concrete composition, the bacteria are likely to die due to friction and impact during the mixing process of the concrete composition. Also, after the concrete composition is mixed, the hardening process results in a drying environment due to a decrease in moisture caused by the hydration reaction, and the nutrients and habitats of the bacteria decrease due to the influence of volume expansion. Furthermore, the size of the internal voids of the hardened concrete composition is 1 μm, which is smaller than the size of general bacteria, making it difficult for bacteria to survive within the concrete voids. Due to such influences, the growth activity of bacteria inside the hardened concrete composition is inhibited, and after about 30 days, most of the bacteria die.

[0039] Therefore, the concrete composition according to the present invention includes a porous material impregnated with bacteria and can create an environment in which bacteria can grow even inside the hardened concrete composition.

[0040] The porous material preferably may have a water retention rate of 40 vol% or more and a porosity of 50 vol% or more, thereby creating an environment in which bacteria can grow. In particular, the porous material has the property of adsorbing organic substances by exchangeable cations (Mg 2+ , Ca 2+ ) present on the surface and can absorb bacteria and the culture solution necessary for the growth of bacteria.

[0041] Generally, during the hydration process of a concrete composition, strongly alkaline calcium hydroxide (Ca(OH)2) is generated, creating a strongly alkaline environment with a pH of 11 to 12, and it is difficult for sufficient light and air to reach the inside of the hardened concrete composition. Therefore, in the present invention, it is important to select alkaliphilic bacteria that are not sensitive to anaerobic, aerobic, and light-dark conditions and have a carbon dioxide adsorption mechanism.

[0042] In addition, the bacteria according to the present invention may be not only bacteria having a carbon dioxide adsorption mechanism but also alkalophilic bacteria that form a glycocalyx. The glycocalyx is a membrane formed around bacteria by the metabolic activities of the bacteria, which densifies the internal structure of the concrete structure and reduces the water permeability of the concrete structure. Therefore, the glycocalyx can prevent carbonation and freeze-thaw of the concrete structure, suppress the intrusion of harmful substances such as sulfates, prevent the deterioration of the concrete structure, and improve the salt damage resistance.

[0043] The bacteria according to the present invention can be classified into bacteria having a Calvin cycle, a reverse tricarboxylic acid cycle, and a hydroxypropionate cycle as carbon dioxide adsorption mechanisms by the carbon dioxide adsorption mechanism.

[0044] First, the bacteria having a Calvin cycle as a carbon dioxide adsorption mechanism may include one or more selected from the group consisting of Rhodobacter capsulatus, Rhodopseudomonas palustris, Rhodobacter blasticus, and Rhodobacter sphaeroids, which are found in purple non-sulfur photosynthetic bacteria.

[0045] Second, the bacteria having a reverse TCA cycle as a carbon dioxide adsorption mechanism may include one or more selected from the group consisting of Thermoproteus and Sulfolobus.

[0046] Thirdly, the bacteria having a hydroxypropionate circuit as a carbon dioxide adsorption mechanism may be green non-sulfur bacteria, and preferably include one or more selected from the group consisting of Planctomyces and Anammox.

[0047] Hereinafter, the carbon dioxide adsorption mechanism of the bacteria according to the present invention will be described in more detail. FIG. 1 is a diagram showing a mechanism by which the bacteria according to the present invention adsorb carbon dioxide through the Calvin cycle. Referring to FIG. 1, the Calvin cycle adsorbs six molecules of carbon dioxide in the process of synthesizing glucose from ATP and NADPH. The Calvin cycle can be roughly divided into three stages. The first stage is the carbon dioxide fixation stage, which is catalyzed by an enzyme called rubisco. Rubisco binds ribulose-1,5-bisphosphate (RuBP), which consists of five carbons, and carbon dioxide to produce two molecules of 3-phosphoglyceric acid (3PG). The second stage is the process in which 3-phosphoglyceric acid (3PG) is converted to glyceraldehyde-3-phosphate (G3P) through a reduction process. The glyceraldehyde-3-phosphate (G3P) thus produced is used to synthesize glucose. The third stage is the reaction in which the regeneration of ribulose-1,5-bisphosphate (RuBP) occurs. The glyceraldehyde-3-phosphate (G3P) produced in the second stage is converted to ribulose-1,5-bisphosphate (RuBP) via ribulose monophosphate (RuMP). The ribulose-1,5-bisphosphate (RuBP) thus regenerated can further repeat the process of binding to carbon dioxide to adsorb carbon dioxide.

[0048] FIG. 2 is a diagram showing a mechanism by which the bacteria according to the present invention adsorb carbon dioxide through the reverse TCA cycle. Referring to FIG. 2, the reverse TCA cycle reverses the TCA cycle and adsorbs three molecules of carbon dioxide in the process of converting carbon dioxide into acetyl-CoA. In the reverse TCA cycle, enzymes such as fumarate reductase that reduces fumarate to succinate, α-ketoglutarate:ferredoxin oxidoreductase that transfers the electrons received as ferredoxin to carbon dioxide and succinyl-CoA and reduces them to α-ketoglutaric acid, and ATP citrate lyase that decomposes citrate to produce oxaloacetate and acetyl-CoA are used.

[0049] FIG. 3 is a diagram showing the mechanism by which the bacterium according to the present invention adsorbs carbon dioxide via the hydroxypropionate cycle. Referring to FIG. 3, the hydroxypropionate cycle adsorbs two molecules of carbon dioxide in the process of converting acetyl-CoA into malyl-CoA. Specifically explaining the stage where the hydroxypropionate cycle adsorbs carbon dioxide, first, acetyl-CoA adsorbs carbon dioxide to form malonyl-CoA, and malonyl-CoA is converted into propionyl-CoA via the intermediate hydroxypropionate. Next, propionyl-CoA adsorbs carbon dioxide in the process of being carboxylated into methylmalonyl-CoA, and methylmalonyl-CoA is isomerized into succinyl-CoA. Thereafter, succinyl-CoA forms malyl-CoA, and malyl-CoA decomposes into acetyl-CoA and glyoxylate.

[0050] As a carbon dioxide adsorption mechanism in which the hydroxypropionate circuit is modified, the 3-hydroxypropionate / 4-hydroxybutyrate cycle and the dicarboxylate / 4-hydroxybutyrate cycle are known.

[0051] The concrete composition according to the present invention has a carbon dioxide adsorption mechanism, contains an alkaliphilic bacterium that forms a glycocalyx, improves the durability of the concrete structure, and can adsorb carbon dioxide in the atmosphere regardless of light and dark conditions.

[0052] Further, the concrete composition according to the present invention has a carbon dioxide adsorption mechanism, contains an alkaliphilic bacterium that forms a glycocalyx, and even if the surface of the concrete structure is damaged, the carbon dioxide adsorption ability can be sustained by the bacteria present inside, and it can exhibit a carbon dioxide adsorption rate that is 3 to 4 times higher than the carbon dioxide adsorption rate due to the carbonation of ordinary concrete.

[0053] After sterilizing the porous material using nanobubble water, it can be completely immersed in a culture solution in which bacteria are cultured at a weight ratio of 1:3 to 4, and a negative pressure can be applied to impregnate the bacteria. Here, the step of applying the negative pressure can be performed at 15 to 25 °C and 1 to 30 torr for 20 to 80 minutes in a negative pressure container, but is not limited thereto.

[0054] The nanobubble water for sterilizing the porous material is ultrafine water droplet bubbles containing oxygen, and a large amount of oxygen is contained in the bubbles. Therefore, when washing the porous material with nanobubble water, the amount of dissolved oxygen inside the porous material can be increased, and the activity of photosynthetic bacteria can be enhanced. In addition, the nanobubble water can remove foreign substances attached to the surface of the porous material. Since the hydroxyl radicals generated in water have (-) properties, they can adsorb to the (+) ions, which are contaminants, and remove the contaminants. During the generation of nanobubbles, oxygen is activated in the air to form molecules such as ozone (O3) and hydroxyl groups (-OH) in the nanobubble water, and these can act as bactericides that destroy organisms and volatile organic compounds. At this time, after washing the porous material with nanobubble water, it can be dried at 100 °C for 6 to 10 hours, but it is not limited thereto.

[0055] In order for the concrete composition according to the present invention to have a preferable carbon dioxide adsorption rate, the bacteria can be cultured in a culture solution at a concentration of 1×10 9 cell / mL or more in an incubator at 5 to 50 °C. Here, the culture solution may contain, but is not limited to, yeast extract, disodium succinate hexahydrate, and potassium dihydrogen phosphate (KH2PO4). For example, the culture solution may contain 1.0 g / L of yeast extract, 1.0 g / L of disodium succinate hexahydrate, 0.5 mL / L of ethanol, 1 mL / L of Ferric citrate solution (0.5%), 0.5 g / L of potassium dihydrogen phosphate (KH2PO4), 0.4 g / L of magnesium sulfate (MgSO4·7H2O), 0.4 g / L of sodium chloride (NaCl), 0.4 g / L of ammonium chloride (NH4Cl), 0.05 g / L of calcium chloride (CaCl2·2H2O), and 1 mL / L of trace element solution (Trace element solution SL-6) per 1 L of purified water.

[0056] The concrete composition according to the present invention may contain 20 to 25 wt% of a cement-based inorganic binder and 75 to 80 wt% of an aggregate mixture, or preferably, 23 wt% of a cement-based inorganic binder and 77 wt% of an aggregate mixture. At this time, the water-binder ratio may be 30 to 50%. Since the manufacturing method of the concrete composition follows a generally known manufacturing method, the description thereof is omitted.

[0057] The concrete coating material according to the present invention contains a cement-based inorganic binder, an aggregate mixture, and a fiber material.

[0058] The cement-based inorganic binder may include one type of ordinary Portland cement, fly ash, blast furnace slag, and polymer powder. The aggregate mixture may include fine aggregate and a porous material impregnated with preferably alkaline bacteria having a carbon dioxide adsorption mechanism and forming a glycocalyx. The fiber material may include at least one of polyethylene and nylon.

[0059] Hereinafter, the configuration of the concrete coating material according to the present invention will be described in more detail. The cement-based inorganic binder may be composed of only one type of ordinary Portland cement, but by replacing a part of the one type of ordinary Portland cement with blast furnace slag and fly ash, it is possible to reduce the carbon dioxide emitted during the production process of the one type of ordinary Portland cement. For example, the cement-based inorganic binder may contain 30 to 40 wt% of one type of ordinary Portland cement, 15 to 25 wt% of fly ash, 40 to 50 wt% of blast furnace slag, and 1 to 10 wt% of polymer powder.

[0060] Here, the polymer powder can improve the adhesiveness to the concrete structure, and an ethylene vinyl acetate (EVA) resin can be used.

[0061] The aggregate mixture may contain 30 to 80 vol% of fine aggregate and 20 to 70 vol% of a porous material. Here, the fine aggregate is an aggregate with a diameter of 5 mm or less, and may include sand, bottom ash, and crushed stone.

[0062] The porous material contained in the concrete coating material according to the present invention has a carbon dioxide adsorption mechanism contained in the concrete composition according to the present invention, and is the same as the porous material impregnated with preferably alkaline bacteria that form a glycocalyx, and thus the description thereof will be omitted.

[0063] The fiber material may prevent deformation such as expansion and contraction of the concrete coating material, and may include at least one of polyethylene and nylon fibers. At this time, the fiber material may have a diameter of 100 to 140 μm, and preferably 120 μm.

[0064] The concrete coating material according to the present invention may contain 20 to 50 wt% of a cement-based inorganic binder and 50 to 80 wt% of an aggregate mixture, or may contain 0.1 to 1 volume part of a fiber material with respect to 100 volume parts of the cement-based inorganic binder and the aggregate mixture. At this time, the ratio of water to binder may be 20 to 50%.

[0065] The concrete coating material according to the present invention can be constructed by a shotcrete construction method in which it is sprayed through a hose using compressed air and placed on the surface of a concrete structure. Shotcrete construction can enter even very small gaps on the surface of a concrete structure, adhere firmly, and can increase the density and strength of the concrete structure. For example, the concrete coating material according to the present invention can be compressed and sprayed with a mobile mixer having a capacity of 10 to 60 L, a monopump having a pumping force of 300 to 1000 rpm and 40 to 100 bar, and a pneumatic compressor having a pressure of 100 to 1000 kPa, and placed 1 to 2 times.

[0066] The concrete coating material according to the present invention is not only applicable to newly constructed concrete structures but also easily applicable to existing completed concrete structures. It is placed on the surface of a concrete structure in contact with the atmosphere, and can enhance the efficiency of carbon dioxide adsorption.

[0067] [Comparative Examples and Experimental Examples] Hereinafter, in order to confirm the carbon dioxide adsorption performance of the concrete composition according to the present invention, concrete blocks according to comparative examples and experimental examples were manufactured.

[0068] Comparative Example 1 is a concrete block with a water-cement ratio of 40%, cement of 23 wt%, fine aggregate of 77 wt%, and a unit cement amount of 450 kg / m 3 . Here, crushed fine aggregate was used as the aggregate.

[0069] Experimental Example 1 has a water-cement ratio of 40%, cement of 23 wt%, and an aggregate mixture of 77 wt%, and a unit cement amount of 450 kg / m 3 , and the aggregate mixture is a concrete block containing 90 vol% of fine aggregate and 10 vol% of porous material. At this time, as the porous material, expanded vermiculite was immersed in a culture solution in which Rhodobacter capsulatus was cultured in a negative pressure container, and then a pressure of 10 to 30 torr was applied for 30 minutes to impregnate the bacteria.

[0070] Experimental Example 2 is the same as Experimental Example 1 except that the aggregate mixture is a concrete block containing 80 vol% of fine aggregate and 20 vol% of porous material.

[0071] Experimental Example 3 is the same as Experimental Example 1 except that the aggregate mixture is a concrete block containing 70 vol% of fine aggregate and 30 vol% of porous material.

[0072] Experimental Example 4 is the same as Experimental Example 1 except that the aggregate mixture is a concrete block containing 60 vol% of fine aggregate and 40 vol% of porous material.

[0073] Experimental Example 5 is the same as Experimental Example 1, except that the aggregate mixture is a concrete block containing 50 vol% fine aggregate and 50 vol% porous material.

[0074] The mixing ratios of the porous material impregnated with bacteria in the aggregate mixtures of Comparative Example 1 and Experimental Examples 1 to 5 are shown in Table 1 below.

[0075] [Table 1]

[0076] Comparative Example 1 and Experimental Examples 1 to 5 were placed in a sealed container saturated with 3000 ppm of carbon dioxide, and the concentration of carbon dioxide inside the sealed container was confirmed at an age of 14 days.

[0077] Figure 4 is a graph showing the carbon dioxide adsorption performance of the concrete blocks according to the comparative example and the experimental examples at an age of 14 days. Referring to Figure 4, carbon dioxide of 100 ppm or less was detected in the sealed container into which the concrete blocks of Experimental Examples 2 to 5 with a mixing ratio of the porous material impregnated with bacteria of 20 vol% or more at an age of 14 days were inserted. That is, it was confirmed that the concrete blocks of Experimental Examples 2 to 5 with a mixing ratio of the porous material impregnated with bacteria of 20 vol% or more exhibited a carbon dioxide adsorption rate of about 96.7% or more.

[0078] Figure 5 is a graph showing the viable count of bacteria in the concrete blocks according to the comparative example and the experimental examples at an age of 14 days. Referring to Figure 5, it was confirmed that bacteria of 1.0×10 4 cell / mL or more survived in the concrete blocks of Experimental Examples 2 to 5 with a mixing ratio of the porous material impregnated with bacteria of 20 vol% or more at an age of 14 days.

[0079] In addition, in order to confirm the durability of the concrete composition according to the present invention based on the mixing ratio of the porous material impregnated with bacteria, the compressive strength and flexural strength of Comparative Example 1 and Experimental Examples 1 to 5 at 28 days of age were measured and shown in Table 2 below.

[0080] [Table 2]

[0081] Referring to Table 2, it was confirmed that the concrete blocks of Comparative Example 1 in which the mixing ratio of the porous material impregnated with bacteria was 50 vol% or less and Experimental Examples 1 to 5 had a compressive strength of 20 MPa or more at 28 days of age, and that the concrete blocks of Comparative Example 1 in which the mixing ratio of the porous material impregnated with bacteria was 40 vol% or less and Experimental Examples 1 to 5 had a flexural strength of 5 MPa or more at 28 days of age.

[0082] Note that the embodiments disclosed in this specification and the drawings are merely specific examples presented for the purpose of facilitating understanding, and are not intended to limit the scope of the present invention. It is obvious to those having ordinary knowledge in the technical field to which the present invention pertains that other modifications based on the technical idea of the present invention can be implemented in addition to the embodiments disclosed herein.

Claims

1. A cementitious inorganic binder containing at least one of ordinary Portland cement, blast furnace slag, and fly ash; An aggregate mixture containing general aggregates and a porous material impregnated with preferably alkaline bacteria having a carbon dioxide adsorption mechanism and forming a glycocalyx; A method for producing a concrete composition comprising: The bacteria are one or more selected from the group consisting of Thermoproteus, Sulfolobus, Planctomyces, Anammox, and Rhodopseudomonas palustris, The bacteria are cultured in a culture solution at a concentration of 1×10 ９ cells / mL or more in an incubator at 5 to 50 °C, The culture solution contains yeast extract, disodium succinate hexahydrate, and potassium dihydrogen phosphate (KH ２ PO ４ ), The porous material is sterilized using nanobubble water before impregnating the bacteria. A manufacturing method.

2. The manufacturing method according to claim 1, characterized by containing 20 to 25 wt% of the cementitious inorganic binder and 75 to 80 wt% of the aggregate mixture.

3. The manufacturing method according to claim 2, characterized in that the aggregate mixture contains 70 to 95 vol% of the general aggregates and 5 to 30 vol% of the porous material.

4. The manufacturing method according to claim 1, characterized in that the porous material contains at least one of expanded vermiculite, perlite, diatomaceous earth, and superabsorbent resin.

5. The manufacturing method according to claim 1, wherein the porous material is a porous material impregnated with the bacteria under negative pressure conditions.

6. A cementitious inorganic binder containing one type of ordinary Portland cement, fly ash, blast furnace slag, and polymer powder; An aggregate mixture containing fine aggregate and a porous material impregnated with preferably alkaline bacteria having a carbon dioxide adsorption mechanism and forming a glycocalyx; A fiber material containing at least one of polyethylene and nylon; A method for manufacturing a concrete coating material, comprising: The bacteria are one or more selected from the group consisting of Thermoproteus, Sulfolobus, Planctomyces, Anammox, and Rhodopseudomonas palustris; The bacteria are cultured in a culture solution at a concentration of 1 × 10 ９ cells / mL or more in an incubator at 5 to 50 °C, The culture solution contains yeast extract, disodium succinate hexahydrate, and potassium dihydrogen phosphate (KH ２ PO ４ ), The manufacturing method, wherein the porous material is sterilized using nanobubble water before impregnating the bacteria.

7. The manufacturing method according to claim 6, comprising 20 to 50 wt% of the cementitious inorganic binder and 50 to 80 wt% of the aggregate mixture, and containing 0.1 to 1 volume part of the fiber material with respect to 100 volume parts of the cementitious inorganic binder and the aggregate mixture.

8. The cement-based inorganic binder contains 30 to 40 wt% of the one type of ordinary Portland cement, 15 to 25 wt% of the fly ash, 40 to 50 wt% of the blast furnace slag, and 1 to 10 wt% of the polymer powder, and is characterized in that it is the manufacturing method according to claim 7.

9. The polymer powder is an ethylene vinyl acetate (EVA) resin, and is characterized in that it is the manufacturing method according to claim 6.

10. The aggregate mixture contains 30 to 80 vol% of the fine aggregate and 20 to 70 vol% of the porous material, and is characterized in that it is the manufacturing method according to claim 7.

11. The fiber material has a diameter of 100 to 140 μm, and is characterized in that it is the manufacturing method according to claim 6.

12. A shotcrete construction method using a concrete coating material manufactured by the manufacturing method according to any one of claims 6 to 11.

Images