Method for manufacturing co2-sequestering concrete paving blocks using carbon dioxide-captured alkaline base mixed solution

Abstract

According to an embodiment, the method for manufacturing concrete paving blocks using a carbon dioxide-captured alkaline base mixed solution of the present disclosure comprises the steps of: (a) contacting an alkaline base mixed solution of specific ingredients with atmospheric carbon dioxide to capture carbon dioxide; (b) reacting the carbon dioxide-contacted alkaline base mixed solution to form carbon dioxide-reacted products including sodium carbonate (Na2CO3), sodium bicarbonate (NaHCO3), or potassium carbonate (K2CO3); (c) mixing cement powder with aggregate, water, and the carbon dioxide-reacted product obtained in step (b) at a predetermined ratio; (d) mixing the cement powder, aggregate, water, and carbon dioxide-reacted product for a set period to form a CO2-sequestering concrete mixture; (e) injecting the CO2-sequestering concrete mixture formed in step (d) into a mold and applying vibrations at a specific frequency range; and (f) removing the mold and curing the CO2-sequestering concrete mixture pre-molded into a pave block under specific conditions, thereby completing the construction of hardened CO2-sequestering concrete paving blocks.

Description

Method for manufacturing CO2 sequestering concrete pavement blocks using a basic alkaline mixture that captures carbon dioxide

[0001] The present invention relates to a method for manufacturing a CO2 sequestering concrete sidewalk block using a basic alkaline mixture that captures carbon dioxide, and more specifically, to a method for manufacturing a CO2 sequestering concrete sidewalk block using a basic alkaline mixture that captures carbon dioxide from the air, and adds the basic alkaline mixture that captures carbon dioxide to cement to sequester CO2 in an environmentally friendly manner while improving the strength of concrete.

[0002] Recently, climate change has led to a surge in natural disasters worldwide, including heat waves, floods, and massive wildfires. The surge in atmospheric carbon dioxide is considered the primary cause of this surge.

[0003] With global atmospheric carbon dioxide concentrations hitting record highs again in 2020, and countries failing to meet their carbon reduction targets, it is predicted that carbon emissions will increase by approximately 16% by 2030 compared to 2010 levels. If this trend continues, it will be difficult to achieve the international target of limiting global warming to 1.5 degrees Celsius (℃) above pre-industrial levels, and the analysis predicts that global temperatures will rise by 2.7 degrees Celsius (℃) by 2100.

[0004] Furthermore, according to the World Meteorological Organization (WMO), the average global atmospheric carbon dioxide concentration in 2020 reached a record high of 413.2 ppm, up 2.5 ppm from 2019. Last year's increase in carbon dioxide concentration exceeded the 10-year average (2.4 ppm), demonstrating a rapid increase. This carbon dioxide concentration represents 149% of the pre-industrial level (1750).

[0005] Experts attribute this continued increase in atmospheric carbon dioxide to its ability to remain in the atmosphere for up to 200 years once emitted. This characteristic has led to a growing global need to rapidly reduce carbon emissions to combat natural disasters caused by carbon dioxide.

[0006] In addition, the World Meteorological Organization also expressed concern that the carbon absorption capacity of terrestrial ecosystems is decreasing, with the Amazon region, which had been absorbing carbon, turning into a carbon source due to development carried out by the Brazilian government.

[0007] As mentioned above, while carbon dioxide is rapidly increasing worldwide and the need for carbon dioxide reduction is recognized, the carbon absorption capacity of terrestrial ecosystems alone has limitations in properly performing the carbon reduction function.

[0008] Meanwhile, although the development of technologies to purify foreign substances such as dust and particulate matter in the air has been actively underway until recently, the development of technologies to continuously capture carbon dioxide in the air and utilize the captured carbon dioxide generated through carbon dioxide capture has not been well developed, and therefore, there is an urgent need for technological development in this regard.

[0009] The applicant of the present invention has previously developed a highly efficient basic alkaline mixture for carbon dioxide capture and has applied for and registered a patent for it.

[0010] Recently, due to the acceleration of global warming, technologies for capturing carbon dioxide are being developed, and accordingly, CCS (Carbon Capture and Storage) technology that can permanently isolate captured carbon dioxide is urgently needed, and various research related to this is actively being conducted.

[0011] The present invention was created to solve the above-described problems, and the purpose of the present invention is to provide a method for manufacturing a CO2 sequestering concrete sidewalk block using a basic alkaline mixture that captures carbon dioxide in the air, and adds the basic alkaline mixture containing the captured carbon dioxide to cement to sequester CO2 in an environmentally friendly manner while improving the strength of the concrete.

[0012] The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0013] According to one embodiment of the present invention for achieving the above object, a method for manufacturing a concrete sidewalk block using a basic alkaline mixture that captures carbon dioxide comprises the steps of: (a) contacting a basic alkaline mixture of a specific component with carbon dioxide in the air for carbon dioxide capture; (b) reacting the basic alkaline mixture in contact with the carbon dioxide to form a carbon dioxide reactant including sodium carbonate (Na2CO3), sodium bicarbonate (NaHCO3), or potassium carbonate (K2CO3); (c) mixing aggregate, water, and the carbon dioxide reactant obtained in step (b) with cement powder at a predetermined ratio; (d) mixing the mixture of cement powder, aggregate, water, and carbon dioxide reactant for a predetermined time to form a CO2 sequestering concrete paste; (e) adding vibration of a predetermined frequency band to the CO2 sequestering concrete paste formed in step (d) after feeding it into a molding machine; And (f) a step of removing the molding machine and curing the CO2 sequestering concrete dough formed into a shape of a sidewalk block under certain conditions to complete the manufacture of a CO2 sequestering concrete sidewalk block that has been hardened.

[0014] In addition, according to one embodiment, the basic alkaline mixture is characterized by including at least one oxide selected from the group consisting of SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O, and P2O3; at least one metal selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd, and Pb; a crystallized synthetic zeolite manufactured from an alumina-based raw material, a silica-based raw material, and sodium hydroxide; and at least one liquid composition selected from the group consisting of sodium tetraborate (Na2B4O7-10H2O), sodium hydroxide (NaOH), sodium silicate (Na2SiO3), potassium hydroxide (KOH), and hydrogen peroxide (H2O2).

[0015] In addition, according to one embodiment, the step (c) is characterized by mixing the carbon dioxide reactant obtained in the step (b) into a mixture of cement powder, aggregate, and water by spraying it using a full cone spray nozzle.

[0016] In addition, according to one embodiment, the preset ratio of step (c) is characterized by mixing 60 to 80 wt% of aggregate (fine aggregate), 10 to 30 wt% of cement, 3 to 13 wt% of water, and 1 to 8 wt% of a basic alkaline mixture that captures carbon dioxide (CO2 capture solution).

[0017] In addition, according to one embodiment, the aggregate is characterized by using fine aggregate or coarse aggregate, and the fine aggregate is a steel plate (metal grain) having a coarseness of 2.7 to 3.1 and a specific gravity of 2.62, and the coarse aggregate is characterized by being a crushed stone having a coarseness of 7.06 to 8.02 and an absorption rate of 0.4% and a particle size of 20 to 30 mm.

[0018] In addition, according to one embodiment, the step (e) is characterized in that, after the CO2 sequestration concrete dough formed in the step (d) is put into a molding machine, a frequency in the range of 15 to 250 Hz is added for less than 3 minutes.

[0019] In addition, according to one embodiment, the full cone spray nozzle is characterized in that the size of the sprayed droplets is 2000㎛ or less under a pressure condition of 40 psi.

[0020] Embodiments of the disclosed technology may have the following advantages. However, this does not mean that the embodiments of the disclosed technology must include all of these, and therefore the scope of the disclosed technology should not be construed as being limited thereby.

[0021] According to one embodiment of the present invention, the strength of concrete structures can be improved by adding a carbon dioxide reactant obtained by capturing carbon dioxide from the air using a basic alkaline mixture to cement, while simultaneously permanently sequestering the captured carbon dioxide. Accordingly, the present invention has the beneficial effect of permanently sequestering the captured carbon dioxide, thereby contributing to the prevention of global warming, while also enhancing the strength and stability of concrete structures.

[0022] In addition, the present invention accelerates the initial hardening of pre-formed sidewalk blocks by adding a highly chemically reactive carbon dioxide reactant together with water to manufacture a CO2-isolated concrete paste, and by adding vibration during the forming of the sidewalk blocks, so that the curing process is carried out at a lower temperature and in a shorter time compared to conventional general sidewalk blocks, thereby increasing the productivity of environmentally friendly sidewalk blocks.

[0023] Figure 1 is a flow chart showing each step of the manufacturing method of CO2 sequestering concrete sidewalk blocks using a basic alkaline mixture that captures carbon dioxide of the present invention.

[0024] Figure 2 is a detailed specification drawing of a full cone spray nozzle applied to the present invention, (a) is the nozzle specification, and (b) is a real image of the nozzle when spraying circularly.

[0025] Figure 3 is a drawing showing the change in flow rate according to the specifications and pressure of the full cone spray nozzle of Figure 2.

[0026] The present invention can have various modifications and various embodiments, and specific embodiments are illustrated in the drawings and specifically described in the detailed description.

[0027] However, this is not intended to limit the present invention to a specific embodiment, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0028] In the present invention, it should be understood that terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0029] Hereinafter, the present invention will be described in detail.

[0030] Figure 1 is a flow chart showing each step of a method for manufacturing a CO2 sequestering concrete sidewalk block using a basic alkaline mixture solution that captures carbon dioxide according to the present invention.

[0031] Referring to the above drawing 1, a method for manufacturing a concrete sidewalk block using a basic alkaline mixture that captures carbon dioxide according to one embodiment of the present invention is comprised of the following steps.

[0032] Step (a) Contact a basic alkaline mixture of specific components with carbon dioxide in the air for carbon dioxide capture. (S100)

[0033] In this step, the basic alkaline mixed solution according to one embodiment comprises: at least one oxide selected from the group consisting of SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O, and P2O3; at least one metal selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd, and Pb; a crystallized synthetic zeolite manufactured from an alumina-based raw material, a silica-based raw material, and sodium hydroxide; and at least one liquid composition selected from the group consisting of sodium tetraborate (Na2B4O7-10H2O), sodium hydroxide (NaOH), sodium silicate (Na2SiO3), potassium hydroxide (KOH), and hydrogen peroxide (H2O2).

[0034] In addition, water may be added to the basic alkaline mixture according to the present invention in a ratio of 1:1 to 1:5 in addition to the liquid composition of the above composition. For example, the liquid composition and water may be maintained in a ratio of 1:1 to 1:4, 1:1 to 1:3, 1:1 to 1:2, 1:2 to 1:5, 1:2 to 1:3, or 1:3 to 1:5.

[0035] That is, the carbon dioxide capture rate in the air can increase as the ratio of the basic alkaline solution increases in the liquid composition and water, but the ratio of water can be appropriately adjusted considering the cost aspect.

[0036] Step (b): The basic alkaline mixture in contact with the carbon dioxide reacts to form a carbon dioxide reactant containing sodium carbonate (Na2CO3), sodium bicarbonate (NaHCO3), or potassium carbonate (K2CO3). (S200)

[0037] In this step, according to one embodiment, the carbon dioxide reactant separated by the separator may be sent to a carbon resource storage facility (not shown) for storage and then recycled for other uses. For example, the carbon dioxide reactant may include sodium carbonate (Na2CO3) or sodium bicarbonate (NaHCO3).

[0038] The above carbon dioxide reactant can be produced by the reaction of a basic alkaline mixture and carbon dioxide, as shown in the following <Reaction Formula 1>.

[0039] <Reaction Scheme 1>

[0040] 2NaOH + CO2→ Na2CO3+ H2O

[0041] Na2CO3+ H2O + CO2→ 2NaHCO3

[0042] The waste solution, excluding the carbon dioxide reactant from the above reaction product, is transferred to a wastewater treatment tank (not shown) and disposed of. For example, the waste solution may include illite minerals and water contained in the basic alkaline mixture that has ceased its catalytic function.

[0043] Step (c): To form a concrete paste, aggregate, water, and the carbon dioxide reactant obtained in step (b) are mixed with cement powder in a predetermined ratio. (S300)

[0044] In one embodiment, the step comprises mixing 60 to 80 wt% of aggregate (fine aggregate), 10 to 30 wt% of cement, 3 to 13 wt% of water, and 1 to 8 wt% of a basic alkaline mixture that captures carbon dioxide (CO2 capture solution) to form a CO2-sequestered concrete paste.

[0045] Fine or coarse aggregate is used as the aggregate. Fine aggregate is steel (metal particles) with a coarseness of 2.7 to 3.1 and a specific gravity of 2.62, and coarse aggregate can be crushed stone with a coarseness of 7.06 to 8.02 and an absorption rate of 0.4%, with a particle size of 20 to 30 mm. If the aggregate is less than 60 wt%, durability is reduced, and if it is more than 80 wt%, there is a risk that it will not meet the performance requirements due to excessive use.

[0046] Cement can be made into a powder by sufficiently mixing raw materials containing lime, silica, alumina, and iron oxide in appropriate proportions, and adding gypsum to the clinker that is partially melted and sintered. If the cement content is less than 10% by weight, durability may be insufficient, and if it exceeds 30% by weight, it may be excessive, resulting in a decrease in hardness.

[0047] In this step, the carbon dioxide reactant is mixed with aggregate and cement powder to form a concrete mixture, 3 to 13 wt% of water and 1 to 8 wt% of carbon dioxide reactant (CO2 capture liquid). Among these, the carbon dioxide reactant is injected by spraying at 1 to 8 wt% or less.

[0048] In one embodiment, the carbon dioxide reactant was added in an amount of 1 to 8 wt% of the cement input weight, i.e., 1 m of concrete. 3 Since 300 kg of cement is input, the maximum input amount of carbon dioxide reactant is 24 kg.

[0049] The injection method may be formed by a structure in which a separate carbon dioxide reactant tank (not shown) is provided, and an injection nozzle is connected from the tank to the inside of the mixing drum.

[0050] In this state, the carbon dioxide reactant is started to be sprayed into the interior of the mixing drum and sprayed for about 5 minutes, and then the mixing drum is continuously rotated for 5 minutes to ensure even mixing of the contents.

[0051] At this time, a full cone spray nozzle is recommended as the injection nozzle of the carbon dioxide reactant, and since approximately 180 L must be injected per 5 minutes, 1 to 2 nozzles with a processing flow rate of 36 L / min or more can be used.

[0052] Here, the full cone spray nozzle refers to a nozzle that sprays a liquid in the shape of a cone discharged from the nozzle, and a full cone means that the droplets of the discharged liquid are completely filled inside the cone. In addition, the full cone spray nozzle has the characteristics of forming a circular spray pattern with a full circular impact area, having a large flow passage diameter, and providing excellent control and uniform distribution.

[0053] FIG. 2 is a detailed specification drawing of a full cone spray nozzle applied to the present invention, in which (a) is a nozzle specification, (b) is a real image when the nozzle is spraying in a circular manner, and FIG. 3 is a drawing showing the specification of the full cone spray nozzle of FIG. 2 and the change in flow rate according to pressure.

[0054] According to one embodiment, the details of the full cone spray nozzle (HM-SP, Hanmi Nozzle Co., Ltd.) applied to the present invention as described above, including its characteristics, materials, and specifications, are as follows.

[0055] - Characteristics: No clogging due to no VANE inside, spiral body structure and

[0056] Various spray angles can be adjusted.

[0057] - Material: BRASS / PP / TEF / SUS all materials / other materials available

[0058] - Specification: See Fig. 2a

[0059] - Circular injection photo: See Fig. 2b

[0060] In addition, specifically, the above spray injection process was carried out with the following specifications.

[0061] - Reason for adopting a full cone spray nozzle: In the case of a full cone spray nozzle, the diameter through which foreign substances pass is large, so there is no clogging caused by foreign substances.

[0062] - Spraying carbon dioxide reactant (CO2 capture solution) using a full cone spray nozzle during the concrete mixing process.

[0063] - Specification: The size of the sprayed droplets (liquid particles) under 40 psi pressure conditions is recommended to be 2000㎛ or less.

[0064] For example, referring to Figure 3, when using one nozzle, the HM24 nozzle (38.8 L / min, 0.5 kgf / cm 2 ) is recommended, and when using two nozzles, HM16 (20.2 L / min, 0.7 kgf / cm 2 (Standard) A nozzle can be used. Afterwards, the carbon dioxide reactant was sprayed into the mixing drum through the nozzle for about 5 minutes.

[0065] Step (d): A mixture of cement powder, aggregate, water, and carbon dioxide reactant is mixed for a predetermined period of time to form a concrete paste with CO2 sequestered therein. (S400)

[0066] For example, this step,

[0067] First, add aggregate → cement → water in that order and mix for 2 to 5 minutes.

[0068] Next, after adding the carbon dioxide reactant (CO2 capture solution), mix sufficiently for an additional 2 to 10 minutes.

[0069] In this step, by mixing the cement powder injected with the carbon dioxide reactant for a certain period of time, sodium carbonate (Na2CO3), sodium bicarbonate (NaHCO3), or potassium carbonate (K2CO3) among the carbon dioxide reactants reacts with the cement powder (Ca(OH)2) to produce calcium carbonate (CaCO3), and the calcium carbonate produced as described above is densely penetrated between the cement pores to form a concrete paste.

[0070] According to one embodiment, by mixing the cement powder injected with the carbon dioxide reactant for about 5 minutes, sodium carbonate (Na2CO3), sodium bicarbonate (NaHCO3), or potassium carbonate (K2CO3) among the carbon dioxide reactants reacts with the cement powder (Ca(OH)2) to produce calcium carbonate (CaCO3), for example, as in the following <Reaction Formula 2>.

[0071] <Reaction Formula 2>

[0072] Na2CO3+ Ca(OH)2→ CaCO3

[0073] The above-mentioned generated calcium carbonate forms a CO2 sequestering concrete paste in which the calcium carbonate is densely penetrated between the pores of the cement.

[0074] For reference, cement powder is a substance that acts as an inorganic adhesive in concrete mix, and this cement powder contains countless pores with an average size of 100 μm. The destruction of concrete structures begins with cracks forming in these pores of cement powder. To improve this destruction, strength-enhancing agents such as SF (Silica Fume), MC (Micro CaCO3), and LS (Lime sludge) are typically added to concrete to fill the pores between the cement powders, thereby increasing strength.

[0075] At this time, the smaller the particle size of the added strength-enhancing agent powder, the more densely it must fill the pores of the cement powder. Therefore, the particle size of the strength-enhancing agent must be equal to or smaller than the pores of the cement powder, preferably less than 100 ㎛, and more preferably less than 61 ㎛, which is known to be the best for the strength of the concrete structure.

[0076] The present invention is characterized in that it uses a carbon dioxide reactant that is a resource-recycled basic alkaline mixture used for carbon dioxide capture as such a strength enhancer.

[0077] That is, by injecting carbon dioxide reactant in an amount of 10 wt% or less relative to cement powder in step (c) by spraying, dense calcium carbonate (CaCO3) particles are formed in the concrete mix.

[0078] [Table 1] below shows the average particle size of calcium carbonate (CaCO3) produced when the carbon dioxide reactant according to the present invention is injected into cement powder by spraying according to one embodiment.

[0079] Example: When carbon dioxide reactant (Na2CO3) is sprayed into cement powder (Ca(OH)2) aqueous solution

[0080] NoDataD(50%)(nm)1Na2CO3spray 13665.82Na2CO3spray 25964.53Na2CO3spray 311852.9Average7161.1

[0081] (The above D50% is the size of the particle when the particle size is listed at the top 50%, meaning the median value)

[0082] As a result of injecting carbon dioxide reactant (Na2CO3) into cement powder (Ca(OH)2) aqueous solution by spraying and mixing for about 5 minutes, calcium carbonate (CaCO3) precipitate with an average particle size of about 7.2 ㎛ was produced. In addition, the calcium carbonate filled the pores of the cement powder by penetrating between them during the mixing process, thereby completing a dense concrete particle structure.

[0083] Comparative example: When carbon dioxide reactant (Na2CO3) is poured into cement powder (Ca(OH)2) aqueous solution.

[0084] NoDataD(50%)(nm)1Na2CO3pour 1363679.12Na2CO3pour 2414394.83Na2CO3pour 37894.0Average261989.0

[0085] (The above D50% is the size of the particle when the particle size is listed at the top 50%, meaning the median value)

[0086] According to [Table 2] of the above comparative example, when the carbon dioxide reactant (Na2CO3) was poured into the cement powder (Ca(OH)2) aqueous solution and mixed for about 5 minutes, calcium carbonate (CaCO3) precipitate with an average particle size of about 262 ㎛ was generated. However, the calcium carbonate with the large particle size did not penetrate evenly between the pores of the cement powder during the mixing process.

[0087] Step (e): The CO2 sequestering concrete mixture formed in the above step (d) is placed in a molding machine (molding mold) and then vibration of a certain frequency is applied. (S500)

[0088] For example, this step involves injecting the CO2-sequestering concrete mixture into a molding machine (mold) and allowing it to harden to form concrete sidewalk blocks of a predetermined shape. The molding machine is manufactured in various shapes as needed and forms concrete sidewalk blocks suitable for the intended use.

[0089] In addition, the molding machine has an inner plate attached to the inner side and bottom. The inner plate is formed by mixing a first additive and a second additive with PVC powder to form a mixture, placing the mixture in a mold, and forming it into a film having a thickness of 2 to 3 mm. The first additive is a mixture of silica sol, isocyanate silane, and organic powder, and the second additive is a mixture of benzethonium chloride and benzalkonium chloride.

[0090] The inner panel helps to separate the concrete sidewalk blocks from the mold after they have hardened, and the second additive has sterilizing properties to eliminate bacteria.

[0091] In addition, the present invention added a frequency of 15 to 250 Hz, preferably 20 to 25 Hz, after putting the CO2 sequestering concrete dough into a molding machine (a mold for manufacturing concrete sidewalk blocks). At this time, the time for adding the frequency was within 3 minutes (if it was continued for more than 3 minutes, layer separation occurred between the liquid and solid components of the concrete), and preferably within 20 to 60 seconds, so that the particle size became fine, and it was possible to manufacture dense nano-sized calcium carbonate.

[0092] Thereafter, the compressive fracture strength of the concrete structure formed according to the above-described embodiment was compared with that of Comparative Examples 1 and 2 (when no strength-enhancing agent was added, i.e., when only cement was poured). The results of the strength comparison are summarized in [Table 3] below.

[0093] Compression breaking strength (N) Example (spray injection) 919 Comparative example 1 (pouring and injection) 789 Comparative example 2 (no additive) 752

[0094] Therefore, referring to the results of the strength comparison above, it was confirmed that when the carbon dioxide reactant of the present invention was sprayed and mixed during the concrete mixing process, calcium carbonate precipitates (powder) with very fine particle sizes were generated during the concrete mixing, and the generated calcium carbonate precipitates evenly penetrated the pores between the cement powders to form a structure, thereby exerting an effect of significantly increasing the strength of the poured concrete. (Strength-enhancing agent replacement effect) In addition, in the case of pouring as in Comparative Example 1 according to the concrete injection method, the median particle size of calcium carbonate was about 262 ㎛, whereas in the case of injection by spraying in the example, the median particle size was about 7.2 ㎛, so that very fine and dense calcium carbonate particles could be obtained.

[0095] In addition, in the test results comparing the compressive strength of the concrete samples after pouring in the above [Table 3], it was confirmed that the concrete sample manufactured by the present invention had an increasing effect of compressive strength that increased by approximately 22% compared to the existing concrete sample (Comparative Example 2). (i.e., Comparative Example 2: 752 N → Example: increased to 919 N)

[0096] Step (f): The molding machine is removed, and the concrete mixture formed into a paving block shape is cured under certain conditions to complete the manufacture of a CO2-sequestering concrete paving block that has been hardened. (S600)

[0097] For example, this step,

[0098] Primary Curing: Curing is performed for 30 minutes at room temperature (20-45°C) in a chamber with a humidity of at least 60%. The addition of carbon dioxide reactants to the concrete mix accelerates initial curing, allowing primary curing to be performed at a lower temperature and in a shorter time than with standard blocks. (Pre-curing)

[0099] Secondary curing: Following the primary curing described above, secondary curing is performed for an additional 5 to 10 hours at room temperature. (Complete curing) Generally, a steam curing process is performed at a temperature of 50°C, but the present invention has the advantage of enabling curing at a low temperature (e.g., room temperature).

[0100] Accordingly, as described above, the manufacturing of a concrete sidewalk block using a basic alkaline mixture that captures carbon dioxide is completed through steps (a) to (f) of the present invention.

[0101] The CO2 sequestering concrete sidewalk block manufactured according to the present invention has the advantage of faster initial hardening during the curing process compared to conventional sidewalk blocks, and thus can be cured at a lower temperature and in a shorter time compared to general blocks.

[0102] Although the embodiments of the present invention have been described with reference to the attached drawings, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical concept or essential features thereof. Therefore, the embodiments described above should be understood to be illustrative in all respects and not restrictive.

[0103] In addition, the scope of this specification is indicated by the scope of the patent claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the scope of the patent claims and their equivalent concepts should be interpreted as being included in the scope of this specification.

[0104] Meanwhile, this specification and drawings disclose preferred embodiments of this specification, and although specific terms are used, they are used in a general sense only to easily explain the technical contents of this specification and help understand the invention, and are not intended to limit the scope of this specification. It will be apparent to those skilled in the art that other modifications based on the technical idea of ​​this specification are possible in addition to the embodiments disclosed herein.

[0105] The present invention can be widely used in the field of manufacturing methods for CO2 sequestering concrete sidewalk blocks.

Claims

1. (a) a step of bringing a basic alkaline mixture of specific components into contact with carbon dioxide in the air for carbon dioxide capture; (b) The basic alkaline mixture in contact with the carbon dioxide reacts to form sodium carbonate (Na 2 CO 3 ), sodium bicarbonate (NaHCO 3 ) or potassium carbonate (K 2 CO 3 ) forming a carbon dioxide reactant; (c) a step of mixing aggregate, water, and carbon dioxide reactant obtained in step (b) into cement powder at a preset ratio; (d) Mixing the mixture of cement powder, aggregate, water and carbon dioxide reactant for a preset period of time to produce CO 2 Step of forming the isolation concrete mixture; (e) CO formed in the above step (d) 2 A step of adding vibration of a certain frequency band after putting the isolation concrete mix into the molding machine; and (f) CO formed into a press block shape by removing the above molding machine. 2 By curing the isolation concrete mix under certain conditions, the CO2 is hardened. 2 Step of completing the manufacture of an insulating concrete pavement block; CO using a basic alkaline mixture containing carbon dioxide captured; 2 Method for manufacturing insulating concrete sidewalk blocks.

2. In paragraph 1, The above basic alkaline mixture is, SiO 2 , Al 2 O 3 , Fe 2 O 3 , TiO 2 , MgO, MnO, CaO, Na 2 O, K 2 O and P 2 O 3 At least one oxide selected from the group consisting of; At least one metal selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd and Pb; Crystallized synthetic zeolite manufactured from alumina-based raw materials, silica-based raw materials and sodium hydroxide; and, Sodium tetraborate (Na 2 B 4 O 7 -10H 2 O), sodium hydroxide (NaOH), sodium silicate (Na 2 SiO 3 ), potassium hydroxide (KOH) and hydrogen peroxide (H 2 O 2 ) is characterized by comprising at least one liquid composition selected from the group consisting of; CO using a basic alkaline mixture that captures carbon dioxide 2 Method for manufacturing insulating concrete sidewalk blocks.

3. In paragraph 1, The above step (c) is, CO using a basic alkaline mixture that captures carbon dioxide, characterized in that the carbon dioxide reactant obtained in the step (b) is mixed by spraying it into a mixture of cement powder, aggregate, and water using a full cone spray nozzle. 2 Method for manufacturing insulating concrete sidewalk blocks.

4. In paragraph 1, The preset ratio of the above step (c) is: 60-80 wt% of aggregate (fine aggregate), 10-30 wt% of cement, 3-13 wt% of water, and a basic alkaline mixture containing carbon dioxide (CO 2 CO using a basic alkaline mixture containing carbon dioxide, characterized by mixing 1 to 8 wt% of the captured solution 2 Method for manufacturing insulating concrete sidewalk blocks.

5. In paragraph 4, The above aggregates are fine aggregates or coarse aggregates, and the fine aggregates are steel particles (metal particles) with a coarseness of 2.7 to 3.1 and a specific gravity of 2.62, and the coarse aggregates are crushed stones with a coarseness of 7.06 to 8.02 and an absorption rate of 0.4%, and are characterized by a CO2-captured basic alkaline mixture. 2 Method for manufacturing insulating concrete sidewalk blocks.

6. In paragraph 1, The above step (e) is, CO formed in the above step (d) 2 CO2 capture using a basic alkaline mixture characterized by adding a frequency of 15 to 250 Hz within 3 minutes after pouring the isolation concrete mix into the molding machine 2 Method for manufacturing insulating concrete sidewalk blocks.

7. In paragraph 3, The above full cone spray nozzle, CO using a basic alkaline mixture that captures carbon dioxide, characterized by a droplet size of 2000㎛ or less sprayed under 40 psi pressure conditions 2 Method for manufacturing insulating concrete sidewalk blocks.

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