Methods for demonstrating carbon dioxide absorption, and equipment for demonstrating carbon dioxide absorption.

Abstract

The objective is to provide a demonstration method for carbon dioxide absorption that can visualize the phenomenon of carbon dioxide absorption by concrete or mortar, and an apparatus for demonstrating carbon dioxide absorption. [Solution] The carbon dioxide absorption demonstration method according to the present invention uses a container comprising a main body having an opening and a cap configured to open and close the opening, and includes an input step of pouring concrete or mortar into the main body from the opening, a supply step of supplying carbon dioxide into the main body from the opening after the input step, and a closing step of attaching the cap to the opening to close the opening after the supply step, wherein as carbon dioxide is absorbed by the concrete or mortar inside the main body, the main body collapses, and the concrete or mortar becomes granular material obtained by crushing hardened concrete or hardened mortar, and the minimum particle size of the granular material is 0.15 mm or more.

Description

Technical Field

[0001] The present invention relates to a demonstration method for carbon dioxide absorption and an apparatus for demonstrating carbon dioxide absorption.

Background Art

[0002] In recent years, in order to reduce carbon dioxide emissions, efforts have been made to absorb and immobilize carbon dioxide in the exhaust gas discharged from cement factories into concrete or mortar. Concrete and mortar using calcium as an alkaline source have a high potential for immobilizing carbon dioxide, and the resulting carbonate is chemically stable, so it is possible to immobilize carbon dioxide semi-permanently, and thus a large carbon dioxide reduction effect is expected.

[0003] The phenomenon of carbon dioxide being absorbed into concrete or mortar can be confirmed, for example, by differential thermal-thermogravimetric simultaneous analysis (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since carbon dioxide is colorless, the phenomenon of carbon dioxide being absorbed into concrete or mortar cannot be confirmed with the naked eye, and it is difficult for the general consumer to understand the carbon dioxide reduction effect.

[0006] In view of these circumstances, the object of the present invention is to provide a method for demonstrating carbon dioxide absorption that can visualize the phenomenon of carbon dioxide absorption by concrete or mortar, and an apparatus for demonstrating carbon dioxide absorption. [Means for solving the problem]

[0007] The carbon dioxide absorption demonstration method according to the present invention is a method for demonstrating carbon dioxide absorption using a container comprising a main body having an opening and a cap configured to open and close the opening, and includes an input step of pouring concrete or mortar into the main body from the opening, a supply step of supplying carbon dioxide into the main body from the opening after the input step, and a closing step of attaching the cap to the opening to close the opening after the supply step, wherein the main body collapses as the carbon dioxide is absorbed by the concrete or mortar inside the main body, and the concrete or mortar is granular material obtained by crushing hardened concrete or hardened mortar, and the minimum particle size of the granular material is 0.15 mm or more.

[0008] The carbon dioxide absorption demonstration method, with its configuration, makes it possible to visualize the phenomenon of carbon dioxide absorption by concrete or mortar by the collapse of the main body. In particular, in the carbon dioxide absorption demonstration method, since the concrete or mortar is granular material obtained by crushing hardened concrete or hardened mortar, and the minimum particle size of the granular material is 0.15 mm or more, the main body begins to collapse after the opening is closed and finishes collapsing in a relatively short time, making the phenomenon of carbon dioxide absorption by concrete or mortar visually easy to understand.

[0009] The carbon dioxide absorption demonstration method according to the present invention may have a main body made of polyethylene terephthalate.

[0010] The aforementioned carbon dioxide absorption demonstration method, with this configuration, allows the main body to collapse appropriately, making the phenomenon of carbon dioxide absorption by concrete or mortar more visually apparent.

[0011] The carbon dioxide absorption demonstration method according to the present invention may include concrete or mortar containing cement and aggregate.

[0012] The aforementioned carbon dioxide absorption demonstration method, with this configuration, makes it easier for the concrete or mortar to absorb the carbon dioxide.

[0013] The carbon dioxide absorption demonstration method according to the present invention may also have a main body thickness of 0.2 mm or less.

[0014] The aforementioned carbon dioxide absorption demonstration method, with this configuration, allows the main body to collapse appropriately, making the phenomenon of carbon dioxide absorption by concrete or mortar more visually apparent.

[0015] The carbon dioxide absorption demonstration method according to the present invention may also involve a container with a volume of 350 mL or more and 1000 mL or less.

[0016] The aforementioned carbon dioxide absorption demonstration method, with this configuration, allows the main body to collapse appropriately, making the phenomenon of carbon dioxide absorption by concrete or mortar more visually apparent.

[0017] In the carbon dioxide absorption demonstration method according to the present invention, the mass of the concrete or mortar introduced into the main body may be 100 g / L or more and 400 g / L or less relative to the volume of the container.

[0018] The aforementioned carbon dioxide absorption demonstration method, with this configuration, makes it easier for the concrete or mortar to absorb the carbon dioxide.

[0019] In the carbon dioxide absorption demonstration method according to the present invention, after the plugging step, the state where the opening is plugged may be maintained for 0.5 minutes or more and 30 minutes or less.

[0020] With such a configuration, the carbon dioxide absorption demonstration method can visually confirm, in a relatively short time, the phenomenon from when the main body starts to collapse until it finishes collapsing.

[0021] In the carbon dioxide absorption demonstration method according to the present invention, the maximum value of the particle diameter of the granular material may be 10 mm or less.

[0022] With such a configuration, in the carbon dioxide absorption demonstration method, carbon dioxide is more likely to be absorbed by the concrete or mortar, and the main body finishes collapsing in a shorter time. Therefore, the phenomenon of carbon dioxide being absorbed by the concrete or mortar is visually easier to understand.

[0023] The apparatus for demonstrating carbon dioxide absorption according to the present invention is an apparatus for demonstrating carbon dioxide absorption for performing the above-described carbon dioxide absorption demonstration method, and includes a container having a main body with an opening, a cap configured to be able to open and close the opening, charging means for charging concrete or mortar into the main body from the opening, and supply means for supplying carbon dioxide into the main body from the opening.

[0024] With such a configuration, the apparatus for demonstrating carbon dioxide absorption can visualize the phenomenon of carbon dioxide being absorbed by concrete or mortar by the collapse of the main body.

Effects of the Invention

[0025] According to the present invention, it is possible to provide a method for demonstrating carbon dioxide absorption that can visualize the phenomenon of carbon dioxide being absorbed by concrete or mortar, and an apparatus for demonstrating carbon dioxide absorption.

Mode for Carrying Out the Invention

[0026] Hereinafter, the method for demonstrating carbon dioxide absorption and the apparatus for demonstrating carbon dioxide absorption according to the present embodiment will be described.

[0027] <Method for Demonstrating Carbon Dioxide Absorption> The method for demonstrating carbon dioxide absorption according to the present embodiment uses a container including a main body having an opening and a cap configured to be able to open and close the opening.

[0028] The main body is formed of, for example, polyethylene terephthalate, polyethylene, etc., and is preferably formed of polyethylene terephthalate so that the main body can be appropriately crushed. The cap is formed of, for example, polypropylene, polyethylene, etc. As the container, for example, a PET bottle or the like can be used.

[0029] The thickness of the main body is preferably 0.2 mm or less, more preferably 0.15 mm or more and 0.2 mm or less so that the main body can be appropriately crushed.

[0030] The volume of the container is preferably 350 mL or more and 1000 mL or less, more preferably 350 mL or more and 650 mL or less, and still more preferably 500 mL or more and 650 mL or less so that the main body can be appropriately crushed.

[0031] The carbon dioxide absorption demonstration method according to this embodiment includes an input step of pouring concrete or mortar into the main body through the opening; a supply step of supplying carbon dioxide into the main body through the opening after the input step; and a closing step of attaching the cap to the opening to close the opening after the supply step, wherein the main body collapses as the carbon dioxide is absorbed by the concrete or mortar inside the main body.

[0032] Concrete or mortar refers to granular material obtained by crushing hardened concrete or mortar after it has hardened. The granular material obtained by crushing hardened concrete or mortar may be moistened with water before use.

[0033] Concrete or mortar contains, for example, cement, aggregate, admixture, water, etc., and preferably contains cement and aggregate from the viewpoint of facilitating carbon dioxide absorption. In one embodiment, concrete or mortar contains a large amount of cement paste composed of cement and water.

[0034] Examples of cements include Portland cements such as ordinary Portland cement, rapid-hardening Portland cement, ultra-rapid-hardening Portland cement, moderate-heat Portland cement, sulfate-resistant Portland cement, and white Portland cement as specified in JIS R 5210; blended cements such as blast furnace cement, fly ash cement, and silica cement; and known cements such as ultrafast-hardening cement and alumina cement.

[0035] Concrete or mortar contains fine aggregate and / or coarse aggregate as aggregate. Fine aggregate is defined as aggregate that passes entirely through a 10 mm mesh sieve and passes through a 5 mm mesh sieve by 85% or more by mass, while coarse aggregate is defined as aggregate that remains on a 5 mm mesh sieve by 85% or more by mass (JIS A 0203:2019).

[0036] Examples of fine aggregates include natural sands such as river sand, land sand, mountain sand, sea sand, crushed sand, and crushed limestone sand, as specified in JIS A 5308:2024 Annex JA for ready-mixed concrete aggregates; slag-derived sands such as blast furnace slag, electric furnace oxidized slag, and ferronickel slag; recycled aggregates; artificial lightweight aggregates; and recovered aggregates. Silica sand produced by crushing and classifying silica is also acceptable.

[0037] Examples of coarse aggregates include natural aggregates such as river gravel, mountain gravel, and sea gravel; artificial aggregates such as crushed sandstone, hard limestone, basalt, andesite; and recycled aggregates.

[0038] Examples of admixtures include inorganic powders such as fly ash, cement kiln dust, blast furnace fumes, blast furnace granulated slag powder, blast furnace decoction slag powder, converter slag powder, hemihydrate gypsum, expansive agents, limestone powder, quicklime powder, dolomite powder, sodium-type bentonite, calcium-type bentonite, attapulgite, sepiolite, activated clay, acid clay, allophane, imogolite, shirasu (volcanic ash), shirasu balloons, kaolinite, metakaolin (calcined clay), synthetic zeolite, artificial zeolite, mordenite, and clinoptilolite.

[0039] Examples of admixtures include AE ​​agents, AE water-reducing agents, high-performance water-reducing agents, high-performance AE water-reducing agents, fluidizing agents, separation-reducing agents, thickeners, thixotropes, setting retarders (e.g., tartaric acid), setting accelerators (e.g., aluminum sulfate), rapid setting agents, shrinkage-reducing agents, foaming agents, defoaming agents, and waterproofing agents.

[0040] The type of water used is not particularly limited; for example, tap water, industrial water, recycled water, groundwater, river water, rainwater, etc., can be used.

[0041] Concrete and mortar contain cement hydrates, such as calcium silicate hydrate, calcium hydroxide, calcium aluminate hydrate, and iron calcium aluminate hydrate, which are produced by the hydration reaction of cement and water. These cement hydrates neutralize carbon dioxide, thereby absorbing it.

[0042] The mass of concrete or mortar to be placed inside the container is preferably 100 g / L to 400 g / L, and more preferably 186 g / L to 400 g / L, relative to the volume of the container, from the viewpoint of facilitating carbon dioxide absorption.

[0043] The concrete or mortar is a granular material obtained by crushing a hardened concrete or hardened mortar, and the minimum particle size of the granular material is 0.15 mm or larger. If the minimum particle size of the granular material is less than 0.15 mm, the rate at which the granular material absorbs carbon dioxide is too fast, and carbon dioxide begins to be absorbed by the granular material before the opening of the container is closed. As a result, the body of the container collapses at the same time as or immediately after closing the opening, making it difficult to visually see the phenomenon of carbon dioxide absorption by the granular material. In the carbon dioxide absorption demonstration method according to this embodiment, because the minimum particle size of the granular material is 0.15 mm or larger, the body of the container begins to collapse 5 seconds or more after closing the opening, and the collapse is completed in a relatively short time, making it easy to visually see the phenomenon of carbon dioxide absorption by the granular material. Furthermore, from the viewpoint of facilitating carbon dioxide absorption, the maximum particle size of the granular material is preferably 10 mm or less, and more preferably 5 mm or less. The particle size of granular material is determined by separating particles that pass through a 1 mm sieve from those that do not, using the method specified in JIS Z 8815 General Rules for Sieve Testing Methods. The particle size of the particles that do not pass through the sieve is then measured using the method specified in JIS Z 8815 General Rules for Sieve Testing Methods.

[0044] In the supply process described above, the amount of carbon dioxide supplied is preferably sufficient to replace the air in the volume of the container with carbon dioxide, and more preferably 1.2 to 2 times the volume of the container, from the viewpoint of making the phenomenon of carbon dioxide absorption by concrete or mortar more visually understandable.

[0045] After the sealing step, the opening is preferably kept closed for 0.5 minutes to 30 minutes, more preferably for 1.5 minutes to 15 minutes, and even more preferably for 1.5 minutes to 4.5 minutes. With this configuration, the carbon dioxide absorption demonstration method according to this embodiment allows for the visual confirmation of the phenomenon from when the main body begins to collapse until it finishes collapsing in a relatively short time. If the time for which the opening is kept closed after the sealing step is too long, it is not suitable as a demonstration to visualize the phenomenon of carbon dioxide absorption by concrete or mortar.

[0046] The carbon dioxide absorption demonstration method according to this embodiment includes an input step of pouring concrete or mortar into the main body through the opening, a supply step of supplying carbon dioxide into the main body through the opening after the input step, and a closing step of attaching the cap to the opening to close the opening after the supply step, thereby making the phenomenon of carbon dioxide absorption by concrete or mortar visible when the main body collapses.

[0047] <Equipment for demonstrating carbon dioxide absorption> The carbon dioxide absorption demonstration device according to this embodiment is a carbon dioxide absorption demonstration device for performing the carbon dioxide absorption demonstration method described above.

[0048] The demonstration apparatus for carbon dioxide absorption comprises a container having a main body with an opening and a cap configured to open and close the opening, an input means for pouring concrete or mortar into the main body through the opening, and a supply means for supplying carbon dioxide into the main body through the opening. As the container, the container described in the demonstration method for carbon dioxide absorption according to this embodiment can be used.

[0049] The aforementioned feeding means is not particularly limited, and for example, it may be configured to measure concrete or mortar using a hopper or the like and feed it into the main body through the opening.

[0050] The supply means may be a pressure vessel filled with carbon dioxide.

[0051] The carbon dioxide absorption demonstration device according to this embodiment includes a container comprising a main body having an opening and a cap configured to open and close the opening, an input means for pouring concrete or mortar into the main body through the opening, and a supply means for supplying carbon dioxide into the main body through the opening, thereby making the phenomenon of carbon dioxide absorption by concrete or mortar visible when the main body collapses.

[0052] The present invention includes the following embodiments. [1] A demonstration method for carbon dioxide absorption using a container comprising a body having an opening and a cap configured to open and close the opening, A pouring step of pouring concrete or mortar into the main body through the opening, After the input step, a supply step is performed in which carbon dioxide is supplied into the main body from the opening, The process includes, after the supply step, a closing step of attaching the cap to the opening and closing the opening, As carbon dioxide is absorbed by the concrete or mortar within the main body, the main body collapses, The concrete or mortar is a granular material obtained by crushing a hardened concrete body or a hardened mortar body. A method for demonstrating carbon dioxide absorption, wherein the minimum particle size of the granular material is 0.15 mm or larger. [2] The carbon dioxide absorption demonstration method according to [1], wherein the main body is made of polyethylene terephthalate. [3] The carbon dioxide absorption demonstration method according to [1] or [2], wherein the concrete or mortar contains cement and aggregate. [4] The carbon dioxide absorption demonstration method described in any one of [1] to [3], wherein the thickness of the main body is 0.2 mm or less. [5] A method for demonstrating carbon dioxide absorption according to any one of [1] to [4], wherein the volume of the container is 350 mL or more and 1000 mL or less. [6] The carbon dioxide absorption demonstration method according to any one of [1] to [5], wherein the mass of the concrete or mortar to be put into the main body is 100 g / L or more and 400 g / L or less relative to the volume of the container. [7] A method for demonstrating carbon dioxide absorption according to any one of [1] to [6], wherein, after the closing step, the opening is kept closed for 0.5 minutes or more and 30 minutes or less. [8] The carbon dioxide absorption demonstration method according to any one of [1] to [7], wherein the maximum particle size of the granular material is 10 mm or less. A demonstration device for carbon dioxide absorption, for performing the carbon dioxide absorption demonstration method described in any one of [9][1] to [8], A container comprising a body having an opening and a cap configured to open and close the opening, An injection means for pouring concrete or mortar into the main body through the aforementioned opening, and A demonstration apparatus for carbon dioxide absorption, comprising a supply means for supplying carbon dioxide into the main body from the opening. [Examples]

[0053] The following describes embodiments of the present invention, but the present invention is not limited to the following embodiments.

[0054] <Absorbent material> As the absorbent material, granular material obtained by crushing hardened concrete containing ordinary Portland cement, fine aggregate, coarse aggregate, and admixtures was used. Table 1 shows the mass and particle size of the absorbent material. For Examples 17 to 21, the amount of water shown in Table 1 was added to the absorbent material.

[0055] The particle size of the granular material was determined by separating particles that passed through a 1 mm sieve from those that did not, using the method specified in JIS Z 8815 General Rules for Sieve Testing Methods. The particle size of the particles that did not pass through the sieve was then measured using the method specified in JIS Z 8815 General Rules for Sieve Testing Methods.

[0056] <Container> As the container, a PET bottle was used, with a body made of polyethylene terephthalate and equipped with a cap. Table 1 shows the volume and thickness of the container body.

[0057] <Examples 1-23> After introducing the absorbent material into the container through the opening, carbon dioxide was supplied at a rate of 200 mL / second, equal to twice the volume of the container, and the opening was closed with a cap. After closing, the time at which the container body began to collapse is defined as the "container deformation start time," and the time at which the container body finished collapsing and no further deformation occurred is defined as the "container deformation end time," as shown in Table 1.

[0058] Furthermore, the degree of crushing of the containers was visually observed and evaluated based on the following indicators. The results are shown in Table 1. ○: The container is so crushed that there is almost no internal space left. △: The container is clearly crushed, but the internal space is clearly still intact. ×: The container does not deform, or it deforms only slightly, with only a slight indentation.

[0059] The start and end times of container deformation, as well as the degree of crushing, were comprehensively evaluated based on the following indicators. ◎: The container deformation started at 5 seconds or more, the deformation ended at 5 minutes or less, and the degree of crushing of the container is "○". ○: The container deformation started at 5 seconds or more, the deformation ended at 5 minutes or less, and the degree of crushing of the container was "△". △: The start time of container deformation is 5 seconds or more, the end time of container deformation is more than 5 minutes, and the degree of crushing of the container is "○" or "△". ×: The container deformation started in less than 5 seconds, or the degree of crushing of the container is "×".

[0060] [Table 1]

[0061] As can be seen from the results in Table 1, the carbon dioxide absorption demonstration method according to the present invention can visualize the phenomenon of carbon dioxide absorption by concrete or mortar. Furthermore, because the carbon dioxide absorption demonstration method according to the present invention uses granular material with a minimum particle size of 0.15 mm or more as the absorbing material, the body of the container begins to collapse more than 5 seconds after the opening is closed, and the collapse is completed in a relatively short time, making the phenomenon of carbon dioxide absorption by concrete or mortar easy to understand visually.

Claims

1. A method for demonstrating carbon dioxide absorption using a container comprising a main body having an opening and a cap configured to open and close the opening, A pouring step of pouring concrete or mortar into the main body through the opening, After the input step, a supply step is performed in which carbon dioxide is supplied into the main body from the opening, The process includes, after the supply step, a closing step of attaching the cap to the opening and closing the opening, As carbon dioxide is absorbed by the concrete or mortar within the main body, the main body collapses, The concrete or mortar is a granular material obtained by crushing a hardened concrete body or a hardened mortar body. A method for demonstrating carbon dioxide absorption, wherein the minimum particle size of the granular material is 0.15 mm or larger.

2. The carbon dioxide absorption demonstration method according to claim 1, wherein the main body is formed of polyethylene terephthalate.

3. The carbon dioxide absorption demonstration method according to claim 1, wherein the concrete or mortar contains cement and aggregate.

4. The carbon dioxide absorption demonstration method according to claim 1, wherein the thickness of the main body is 0.2 mm or less.

5. The carbon dioxide absorption demonstration method according to claim 1, wherein the volume of the container is 350 mL or more and 1000 mL or less.

6. The carbon dioxide absorption demonstration method according to claim 1, wherein the mass of the concrete or mortar to be put into the main body is 100 g / L or more and 400 g / L or less relative to the volume of the container.

7. The carbon dioxide absorption demonstration method according to claim 1, wherein, after the closing step, the state in which the opening is closed is maintained for 0.5 minutes or more and 30 minutes or less.

8. The carbon dioxide absorption demonstration method according to claim 1, wherein the maximum particle size of the granular material is 10 mm or less.

9. A demonstration apparatus for carbon dioxide absorption, for performing the carbon dioxide absorption demonstration method described in any one of claims 1 to 8, A container comprising a body having an opening and a cap configured to open and close the opening, An injection means for pouring concrete or mortar into the main body through the aforementioned opening, and A demonstration apparatus for carbon dioxide absorption, comprising a supply means for supplying carbon dioxide into the main body from the opening.

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