Method for producing construction material, method for achieving carbon neutrality in generation and use of construction material, and construction material

Abstract

To solve such problems that although it is known to use crushed shells for a part of an aggregate of a construction material, there has been no consideration from the viewpoint of so-called carbon neutral such as reducing carbon dioxide (CO2) absorbed by shellfish in water such as in the ocean, without releasing it into the atmosphere or seawater, accordingly an amount of CO2 absorbed by shells from an environment during their growth has not been taken into account.SOLUTION: In order to grasp an amount of CO2 absorbed by shells from an environment during their growth, the amount of CO2 absorbed by the shells during their growth is calculated by multiplying a weight of the shells by a content ratio of calcium carbonate, and further multiplying the product by a value obtained by dividing a molecular weight of carbon dioxide by a molecular weight of calcium carbonate. In this way, an amount of CO2 sealed and fixed in a construction material is grasped. An amount of CO2 generated during production of the construction material is compared with the amount of CO2 sealed and fixed in the construction material, or a difference between the two is detected and displayed.SELECTED DRAWING: Figure 1B

Description

[Technical Field]

[0001] The present invention relates to a method for producing a construction material, a method for achieving carbon neutrality in the production and use of construction materials, and construction materials. [Background technology]

[0002] Aggregates are generally mixed into asphalt and cement used in civil engineering and construction projects, including road construction. The aggregates used are mixtures of various types of sand and stone powder. These materials are mixed by passing them through multiple different sieves. Meanwhile, the shells of edible shellfish, such as scallops and oysters, are generated in large quantities and are difficult to dispose of as industrial waste. Therefore, it has been proposed to use crushed shells as a substitute for a portion of the aggregate, i.e., various types of sand and stone powder, mixed into asphalt and cement. Non-Patent Document 1 listed below presents an example of using crushed scallop shells as part of the aggregate in an asphalt mixture when producing asphalt pavement materials. Specifically, the density and stability of a mixture containing 15% to 30% crushed scallop shells that have been passed through a 0.075 mm to 13.2 mm sieve are shown.

[0003] Furthermore, Patent Document 1 below discloses a method for producing a solidification material using oyster shells. Specifically, Patent Document 1 discloses heat-treating oyster shells to produce quicklime, which is then heated and treated with water to produce slaked lime. The resulting quicklime and slaked lime are then crushed, classified, and reacted with gypsum to solidify, which is then used as a construction material for improving soft ground and filling underground cavities. Furthermore, Patent Document 2 below describes a technical concept for reducing carbon dioxide emissions by subtracting the amount of carbon dioxide (hereinafter referred to as "CO2") emitted during concrete production from the amount of CO2 absorbed by carbonation curing to calculate and understand the actual amount of CO2 emitted into the environment. Furthermore, Patent Document 3 below describes crushing oyster shells and mixing the resulting pulverized material with asphalt or aggregate (Claim 1 and others). Furthermore, Patent Document 4 below describes mixing granulated scallop shells with a molten mud indicator (Claim 1 and others). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-362949 A Abstract [Patent Document 2] JP 2014-051422 A (

[0001] ,

[0020] ,

[0047] -

[0066] [Patent Document 3] JP 2005-068914 A (

[0001] ,

[0006] ,

[0024] -

[0049] , Figure 1) [Patent Document 4] Japanese Patent Application Laid-Open No. 2006-322290 (

[0005] ) [Non-patent literature]

[0005] [Non-Patent Document 1] Paper from the 25th Japan Road Conference: Asphalt Pavement with Hatate Shells, published November 5, 2013 Summary of the Invention [Problem to be solved by the invention]

[0006] Non-Patent Document 1, cited above, discloses the use of crushed scallop shells as part of the aggregate for road paving asphalt. The underlying idea is to use scallop shells, which are difficult to process as industrial waste, as a method of treating industrial waste by mixing them into road paving asphalt. Therefore, Non-Patent Document 1 does not at all consider the so-called carbon neutral perspective of reducing carbon dioxide (CO2) absorbed by shellfish such as scallops in ocean waters without releasing it into the atmosphere or seawater. Consequently, there is no disclosure or suggestion of determining the amount of CO2 absorbed from the environment by shells during growth. Therefore, even if construction materials are manufactured by mixing shells, it is not possible to determine the amount of carbon dioxide encapsulated and fixed within the construction materials.

[0007] Furthermore, while Patent Document 1 discloses the processing of oyster shells into a solidifying material for use as a construction material, it does not at all consider the so-called carbon neutral perspective of reducing carbon dioxide (CO2) absorbed by shellfish in water, such as the ocean, without releasing it into the atmosphere or seawater. Therefore, there is no disclosure or suggestion of determining the amount of CO2 absorbed from the environment by shells during growth. Therefore, even if construction materials are manufactured by mixing shells, it is not possible to determine the amount of carbon dioxide encapsulated and fixed within the construction materials.

[0008] The above-mentioned Patent Document 2 describes a technical idea for reducing carbon dioxide emissions by calculating and understanding the amount of CO2 actually emitted into the environment by subtracting the CO2 absorbed by carbonation curing from the CO2 emitted during concrete production. However, the invention of the above-mentioned Patent Document 2 does not disclose or suggest how to understand the amount of CO2 absorbed from the environment by seashells during growth. Therefore, even if construction materials are manufactured by mixing seashells, it is not possible to understand the amount of carbon dioxide encapsulated and fixed within the construction materials.

[0009] The above-mentioned Patent Document 3 describes the mixing of crushed oyster shells with asphalt or aggregate. However, the above-mentioned Patent Document 3 does not disclose or suggest a quantitative analysis of how much CO2 the shells absorb from the ocean during their growth. Therefore, even if construction materials are manufactured by mixing shells, it is not possible to determine the amount of carbon dioxide encapsulated and fixed within the construction materials.

[0010] The above-mentioned Patent Document 4 describes mixing granulated scallop shells into a molten mud marking material. However, the above-mentioned Patent Document 4 does not disclose or suggest a quantitative analysis of how much CO2 the shells absorb from the ocean during their growth. Therefore, even if construction materials are manufactured by mixing shells, it is not possible to determine the amount of carbon dioxide encapsulated and fixed within the construction materials. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention produces paving asphalt and paving concrete. Focusing on the fact that shellfish absorb approximately the same amount of carbon dioxide as the majority of the carbon dioxide emitted during the process of producing and transporting the produced asphalt and concrete, the present invention produces construction materials by trapping the carbon dioxide absorbed by the shellfish and contained in their shells in their shells and mixing them with other aggregates. The amount of carbon dioxide trapped and fixed in the construction materials is determined using the calcium carbonate content of the shells mixed in the production of the construction materials, and, if necessary, the construction materials are used for road and other construction projects while achieving carbon neutrality.

[0012] That is, according to the present invention, there is provided a method for producing a construction material by mixing seashells with other materials, wherein the seashells grow in water, including the ocean, and absorb carbon dioxide in the water to produce calcium carbonate, which becomes the main component of the shells, and the method includes a step of calculating the amount of carbon dioxide absorbed by the shells during their growth by multiplying the weight of the shells by the calcium carbonate content, and multiplying this product by the value obtained by dividing the molecular weight of carbon dioxide by the molecular weight of calcium carbonate, thereby determining the amount of carbon dioxide encapsulated and fixed in the construction material.

[0013] Furthermore, according to the present invention, there is provided a method for achieving carbon neutrality in the production and use of construction materials, comprising the steps of calcining the shells of shellfish that grow in water, including the ocean, and absorb carbon dioxide in the water to produce calcium carbonate, which is the main component of the shells; crushing the calcined shells; mixing the crushed shells with other aggregates and / or asphalt and / or other materials to produce construction materials; and using the construction materials for paving or construction, or for manufacturing elements to be used in construction. The method also comprises the step of multiplying the weight of the shells mixed in the step of producing the construction materials by the proportion of calcium carbonate contained in the shells, and determining that the amount of carbon dioxide encapsulated and fixed in the shells is the amount obtained by dividing the molecular weight of carbon dioxide by the molecular weight of calcium carbonate or by 44 / 100.

[0014] The present invention also provides a method for achieving carbon neutrality in the production and use of construction materials, comprising the steps of: calcining shells of shellfish that grow in water, including the ocean, and absorb carbon dioxide in the water to produce calcium carbonate, which is the main component of the shells; crushing the calcined shells; mixing the crushed shells with other aggregates and / or asphalt and / or other materials to produce construction materials; and using the construction materials for paving or construction, or for manufacturing elements for use in construction. The step of producing the construction material includes a first calculation step of calculating the amount of carbon dioxide (A) generated per unit weight until the aggregate and / or asphalt and / or other materials in the construction material are produced, and a step of calculating the amount of carbon dioxide (B) absorbed in the water during growth per unit weight of the shells mixed in the step of producing the construction material by multiplying the proportion of the amount of calcium carbonate contained in the shells by the unit weight, and multiplying the product by the molecular weight of carbon dioxide divided by the molecular weight of calcium carbonate or by 44 / 100 to obtain a value. a second calculation step of calculating the amount of carbon dioxide (B) by multiplying the amount of carbon dioxide (A) obtained in the first calculation step by the weight (C) of the generated construction material to calculate the total amount of carbon dioxide (D) generated in the generation stage of the aggregate and / or asphalt and / or other materials in the construction material; a fourth calculation step of multiplying the weight (E) of the mixed shells by the amount of carbon dioxide (B) calculated in the second calculation step to calculate the total amount of carbon dioxide (F) encapsulated and fixed; A method for achieving carbon neutrality is provided, comprising the steps of: comparing the total amount of carbon dioxide (D) with the total amount of carbon dioxide (F) obtained in the fourth calculation step; displaying, as a result of the comparison, which of the total amount of carbon dioxide (D) and the total amount of carbon dioxide (F) is larger; calculating and displaying the difference between the total amount of carbon dioxide (D) and the total amount of carbon dioxide (F); and, in the step of generating construction materials, mixing the shells of weight (E>) with the other aggregates and / or asphalt and / or other materials.

[0015] Also, according to the present invention, there is provided a method for achieving carbon neutrality in the production and use of construction materials, comprising the steps of calcining shells of shellfish that grow in water, including the ocean, and absorb carbon dioxide in the water to produce calcium carbonate, which is the main component of the shells; crushing the calcined shells; mixing the crushed shells with other aggregates and / or asphalt and / or other materials to produce construction materials; and using the construction materials for paving or construction, or for manufacturing elements to be used in construction, wherein the step of producing the construction materials includes a first calculation step of calculating the amount of carbon dioxide generated per unit weight (A) until the aggregates and / or asphalt and / or other materials in the construction material are produced; and calculating the amount of carbon dioxide absorbed in the water during growth per unit weight of the shells to be mixed in the step of producing the construction materials (B), by multiplying the proportion of the amount of calcium carbonate contained in the shells by the unit weight and adding the resulting product to the amount of carbon dioxide. A method for achieving carbon neutrality is provided, which includes the following steps: a second calculation step of calculating the amount of carbon dioxide (B) by dividing the molecular weight of carbon by the molecular weight of calcium carbonate or multiplying it by 44 / 100; a third calculation step of multiplying the amount of carbon dioxide (A) obtained in the first calculation step by the weight (C) of the construction material to be produced to calculate the total amount of carbon dioxide (D) generated in the production stage of the aggregate and / or asphalt and / or other materials in the construction material; a fourth calculation step of calculating the amount of shells (G) to be mixed in when the construction material is produced, which is necessary to offset the total amount of carbon dioxide (D) obtained in the third calculation step, by dividing (D / B) the total amount of carbon dioxide (D) generated in the production stage of the construction material by the amount of carbon dioxide per unit weight (B) obtained in the second step; and a step of mixing the amount of shells (G) calculated in the fourth step with the other aggregate and / or asphalt and / or other materials in the step of producing the construction material.

[0016] In one preferred embodiment of the present invention, the method further comprises a step of determining the content ratio of calcium carbonate in consideration of the type and processing state of the shells.

[0017] In one preferred embodiment of the present invention, the determining step uses the results of component analysis that takes into account the type and processing state of the shell.

[0018] In one preferred embodiment of the present invention, the shells are mixed in an amount of 7 to 20% by weight of the construction material.

[0019] In one preferred aspect of the present invention, the first calculation step includes calculations that include the amount of carbon dioxide emitted when materials are brought in or products are taken out and / or the amount of carbon dioxide emitted when electricity is generated to be used at the construction material production plant.

[0020] In one preferred embodiment of the present invention, the first calculation step includes calculation of the amount of carbon dioxide emitted during firing of the shells.

[0021] In one preferred aspect of the present invention, the step of using the construction material for paving or construction or for manufacturing elements for use in construction further comprises a step of using the construction material as a material for a frost heave suppression layer that is part of the roadbed located below the roadbed.

[0022] In one preferred aspect of the present invention, the step of using the construction material for paving or construction or for manufacturing elements for construction further comprises the step of using the construction material as a material for the surface course, base course or subgrade of a pavement, or for the roadbed located below the subgrade.

[0023] One preferred aspect of the present invention is that the method for achieving carbon neutrality in the production and use of construction materials further includes a step of laying a predetermined thickness of crushed seashells mixed with synthetic resin on the surface of the constructed paved road and / or building.

[0024] Furthermore, the present invention provides a construction material manufactured by the method for manufacturing a construction material of the present invention, and said construction material for use in the method for achieving carbon neutrality in the production and use of a construction material of the present invention. [Effects of the Invention]

[0025] According to the method for manufacturing construction materials of the present invention and / or the method for achieving carbon neutrality in the production and use of construction materials of the present invention, the carbon dioxide absorbed by shellfish during their growth in water and trapped in their shells is used as aggregate for road paving and construction, thereby reducing carbon dioxide released into the environment and making it possible to grasp the amount of carbon dioxide encapsulated and fixed in construction materials.

[0026] Furthermore, the construction material of the present invention contains carbon dioxide that is absorbed by the shells during their underwater growth and trapped in the shells in the same state in the final mix and final product, which reduces the amount of carbon dioxide released into the environment and also makes it possible to grasp the amount of carbon dioxide that is encapsulated and fixed in the construction material.

[0027] Furthermore, according to the present invention as set forth in claim 6, it is possible to grasp the amount of carbon dioxide encapsulated and fixed in construction materials while realizing carbon neutrality.

[0028] Furthermore, according to the present invention as set forth in claim 7, while realizing carbon neutrality, it is possible to grasp the amount of carbon dioxide generated during the production stage of aggregates and the like in construction materials and the amount of carbon dioxide encapsulated and fixed in the construction materials, and compare them, grasp the difference between the two, and display them.

[0029] Furthermore, according to the present invention as set forth in claim 8, it is possible to achieve carbon neutrality while determining the amount of shells required to offset the amount of carbon dioxide generated during the production stage of aggregates and other building materials, and to mix in that required amount.

[0030] The term "carbon neutral" generally refers to a situation in which the amount of carbon dioxide released into the environment is equal to the amount of carbon dioxide absorbed and reduced from the environment, with the plus or minus being zero. However, in this specification, "carbon neutral" refers to a situation in which the majority of the carbon dioxide emitted during the process of manufacturing the final aggregate or final product of construction materials (which may also include the transportation process) is trapped in those final aggregates or final products.

[0031] Although the following embodiments describe a composite material for road paving, the present invention is not limited to roads, but is applicable to construction materials for paving surfaces of all kinds, including sidewalks, bridge surfaces, parking lots, parks, grounds, and building sites. Furthermore, the present invention is not limited to road and land surface paving, but is applicable to construction materials including asphalt and concrete mixtures used in the main and surface structures of tunnels, dams, and other buildings, as well as construction materials including asphalt and concrete mixtures used in the foundations, columns, beams, walls, ceiling members, roof members, sleepers, and other components of such buildings. Therefore, the term "construction materials" in this invention is a broad concept that includes these various elements and should not be interpreted as being limited to the construction materials for road paving described in the embodiments. The term "road" includes roadways, shoulders, sidewalks, service roads, bridges, and the like, including general roads and expressways, and also includes not only public roads but also private roads. [Brief explanation of the drawings]

[0032] [Figure 1A] This is a sequence chart showing the production and use of construction materials, including a shell production process, in a preferred embodiment of the construction material manufacturing method of the present invention and the method of achieving carbon neutrality in the production and use of construction materials of the present invention. [Figure 1B] This is a part of a sequence chart showing the production and use of construction materials, including a shell production process, in another preferred embodiment of the construction material manufacturing method of the present invention and the method of achieving carbon neutrality in the production and use of construction materials of the present invention. [Figure 1C] This is a part of a sequence chart showing the production and use of construction materials, including a shell production process, in yet another preferred embodiment of the construction material manufacturing method of the present invention and the method for achieving carbon neutrality in the production and use of construction materials of the present invention. [Figure 2] This is a schematic diagram showing how shellfish shells absorb carbon dioxide during their growth process and produce calcium carbonate, which is the premise of the construction material manufacturing method and the method for achieving carbon neutrality in the production and use of construction materials of the present invention. [Figure 3] This is a schematic diagram showing how shellfish shells absorb carbon dioxide during their growth process to produce calcium carbonate, which is the premise of the construction material manufacturing method and the method for achieving carbon neutrality in the production and use of construction materials of the present invention, and shows the process that follows the process shown in Figure 2. [Figure 4] This is a schematic diagram showing the movement of carbon and other substances in marine organisms, which is the premise for the production of calcium carbonate shown in Figures 2 and 3. [Figure 5] FIG. 5 is a schematic diagram showing the trend of carbon dioxide in the ocean, which is the basis for the schematic diagrams shown in FIGS. [Figure 6] FIG. 4 is a schematic diagram showing another aspect of the calcium carbonate production process described in FIGS. 2 and 3. [Figure 7] This figure includes a table showing the composition of aggregate in the composite material used in the present invention's method for manufacturing construction materials and method for achieving carbon neutrality in the production and use of construction materials, comparing a conventional case that does not include scallop shells with the present invention's case that does include scallop shells. [Figure 8] This is a schematic diagram showing the amount of carbon dioxide generated when recycled dense granules (13F) that are mixed as aggregate into asphalt for road paving are manufactured at a factory and shipped. [Figure 9]This is a schematic diagram to explain how much carbon dioxide (CO2) emissions can be reduced by the method of achieving carbon neutrality in the production and use of construction materials of the present invention compared to the conventional method of not mixing shells into the mix. [Figure 10] This is a photograph showing a partial cross section of a road, illustrating yet another example of the method for manufacturing construction materials of the present invention and the method for achieving carbon neutrality in the production and use of construction materials. [Figure 11] FIG. 1 is a cross-sectional view showing the standard configuration of asphalt pavement in road structures in the "Road Design Guidelines" created by the Ministry of Construction, and explains an example of the use of the construction material of the present invention in road structures.

[0033] Below, with reference to the drawings, a preferred embodiment of the method for manufacturing construction materials and the method for achieving carbon neutrality in the production and use of construction materials of the present invention will be described. FIG. 1A is a sequence chart showing the production and use of construction materials, including a shell production process, in one preferred embodiment of the method for manufacturing construction materials and the method for achieving carbon neutrality in the production and use of construction materials of the present invention. The process of absorbing carbon dioxide (CO2) dissolved in the ocean during the growth process of scallops and other shells, which are the subject of processing, will be explained using FIGS. 2 to 6. Note that FIGS. 2 to 4 and 6 have been reproduced with some modifications from the section on scallops on the website ms-laboratory.jp.

[0034] Figure 2 is a schematic diagram showing how shellfish shells absorb carbon dioxide and produce calcium oxide during their growth, which is the premise of the present invention's construction material manufacturing method and method for achieving carbon neutrality in the production and use of construction materials. While the present invention applies to shellfish in general, a preferred embodiment will be described using scallops as an example. Scallops live in the ocean, and calcium oxide (CaO), the main component of scallop shells, absorbs water (HO) from the ocean and produces calcium hydroxide (Ca(OH)). The resulting calcium hydroxide (Ca(OH)) adsorbs carbon dioxide (CO) dissolved in the ocean, producing calcium carbonate (CaCO) and water (HO). Of the resulting calcium carbonate (CaCO) and water (HO), the water (HO) is excreted into seawater, leaving only calcium carbonate (CaCO). Therefore, scallop shells obtained through scallop fishing contain calcium carbonate (CaCO).

[0035] The process shown in Figure 2 can be expressed by the following equation: CaO + HO → Ca(OH)(1) Ca(OH)2+ CO2 → CaCO3+ H2O (2)

[0036] Figure 3 is a schematic diagram showing how shellfish shells absorb carbon dioxide during their growth and produce calcium oxide, which is the premise of the present invention's manufacturing method for construction materials and the method for achieving carbon neutrality in the production and use of construction materials. It shows the process that follows the process shown in Figure 2, and illustrates the process in which "of the calcium carbonate (CaCO3) and water (H2O) thus produced, the water (H2O) is discharged into seawater, leaving only calcium carbonate (CaCO3)."

[0037] Figure 4 is a schematic diagram showing the movement of carbon and other substances in marine organisms, which is the premise for the production of calcium oxide shown in Figures 2 and 3. As shown in Figure 4, carbon dioxide in the atmosphere and carbon dioxide in the ocean are in equilibrium, and the total amount in the ocean is 5.6 x 10 16t (tons) of carbon dioxide exists in the atmosphere. 12 t of carbon dioxide, there is far more carbon dioxide in the ocean than in the atmosphere.

[0038] As shown in Figure 4, blue-green algae and phytoplankton in the ocean absorb sunlight and absorb water (H2O) and carbon dioxide (CO2) from the ocean to perform photosynthesis, releasing organic matter (C, H, O) and carbon components (C) and oxygen (O2), which serve as food for shellfish such as scallops. The organic matter also releases carbon components (C), which serve as food for zooplankton in the ocean. The diagram also shows how scallops absorb calcium ions from the ocean and produce calcium carbonate (CaCO3). The diagram also shows how fish in the ocean eat zooplankton and release carbon dioxide (CO2).

[0039] Figure 5 is a schematic diagram showing the trend of carbon dioxide in the ocean, which is the basis for the schematic diagrams shown in Figures 2 to 4. Figure 5 is a partially modified version of the data and materials published on the Japan Meteorological Agency website under "Various Data and Materials > Ocean Health Check Table > Comprehensive Check Table 2nd Edition > [Column] Ocean Acidification." As shown in Figure 4, carbon dioxide (CO2) in the atmosphere and carbon dioxide (CO2) in the ocean are in equilibrium, and much of the carbon dioxide in the atmosphere is dissolved in the ocean. Carbon dioxide (CO2) dissolved in the ocean reacts with water (H2O) to form carbon dioxide (H2CO3), as shown in the following formula (3). Carbon dioxide (H2CO3) is converted into hydrogen ions (H + ) dissociates into bicarbonate ions (HCO3 - ) and carbonate ions (CO3 2 ) and maintains a state of chemical equilibrium through the reactions shown in equations (4) and (5) below.

[0040] CO2 + H2O ⇔ H2CO3(3) H2CO3⇔H + + HCO3 - (4) HCO3 - ⇔ H ++ CO3 2- (5)

[0041] As shown in Figure 5, most of the carbon dioxide (CO2) dissolved in seawater is converted into bicarbonate ions (HCO3 - ) and carbon ions (CO3 2- ) As a result of these reactions, hydrogen ions (H + ) dissociates, acidifying seawater. (3) to (5) in Figure 5 correspond to the above formulas (3) to (5).

[0042] Figure 6 is a schematic diagram showing another aspect of the calcium carbonate production process explained in Figures 2 and 3. Generally, shellfish such as scallops perform respiratory metabolism when they live in the ocean, and release carbon dioxide (CO2) into the ocean (see [1] in Figure 6). When carbon dioxide (CO2) in the ocean dissolves in water, it ionizes (see [2] in Figure 6) to form carbonate ions (CO3 2- ) The carbonate ions (CO3 2- ) is taken up (absorbed) by shellfish, but calcium ions (Ca 2+ ) are also taken up (absorbed) into the shell. 2+ ) and carbonate ions (CO3 2- ) reacts to produce calcium carbonate (CaCO3). The calcium carbonate (CaCO3) production process is represented by the following formula (6) shown in Figure 5 (6). Ca 2+ + CO3 2- ⇔ CaCO3(6)

[0043] Next, we will explain the manufacturing method of construction materials and the method for achieving carbon neutrality in the production and use of construction materials of the present invention, but we will also explain the premise behind this. Figure 8 is a schematic diagram showing the amount of carbon dioxide (CO2) generated when recycled dense granules (13F) to be mixed as aggregate into road paving asphalt are manufactured at a factory and shipped. Figure 8 shows the weight of carbon dioxide (CO2) emitted in each phase when 1 ton of the mixture is manufactured and shipped. In Figure 8, each phase is shown as SCOPE 1, SCOPE 2, and SCOPE 3 below.

[0044] SCOPE 1: Direct emissions during manufacturing at factories: 26.60 kg SCOPE 2: 2.50 kg of waste generated when generating electricity for use in factories SCOPE 3: Waste generated during transport, such as bringing in materials and removing composite materials: 14.51 kg

[0045] As shown in Figure 8, the total amount of carbon dioxide (CO2) emitted in SCOPE 1, SCOPE 2, and SCOPE 3 is 43.61 kg per ton of mix. The amount of carbon dioxide (CO2) emitted shown in Figure 8 is for the case where no shells are mixed into the mix, and serves as a premise for showing how much carbon dioxide (CO2) emissions will be reduced by the method of achieving carbon neutrality in the production and use of construction materials of this invention.

[0046] FIG. 9 is a schematic diagram illustrating the degree to which carbon dioxide (CO2) emissions can be reduced by the construction material manufacturing method of the present invention and the method for achieving carbon neutrality in the production and use of construction materials compared to conventional methods in which seashells are not mixed into the mix. The upper center of FIG. 9 shows the amount of carbon dioxide (CO2) in graph form, with the area above the reference axis X representing the amount of carbon dioxide (CO2) emitted and the area below representing the amount of carbon dioxide (CO2) reduced. The left part of this graph shows the total amount of carbon dioxide (CO2) emitted in SCOPE 1, SCOPE 2, and SCOPE 3 described in FIG. 8. In other words, if seashells are not mixed into the mix during production, the total amount of carbon dioxide (CO2) emitted is 43.61 kg per ton of mix.

[0047] The right side of the upper graph in Figure 9 shows the amount of carbon dioxide (CO2) emissions and reductions when mixing in about 10% shells in the production of composite material. First, in terms of emissions, as in Figure 8, the total amount of emissions during factory and transportation is 43.61 kg per ton of composite material, and an additional 1.95 kg of carbon dioxide (CO2) is emitted during the drying of the shells, which will be discussed later. Therefore, the total amount of carbon dioxide emissions is 45.56 kg.

[0048] Next, regarding the amount of carbon dioxide (CO2) emissions reduction, the amount of carbon dioxide (CO2) contained in calcium carbonate (CaCO3), the main component of shells, is 45.1 kg. The basis for this is as follows: If 10.7% by weight of scallop shells are mixed into 1 ton of mix, the weight of the scallop shells will be 107 kg. The amount of calcium carbonate (CaCO3) in these scallop shells is 95.8%, as shown in No. 3 in Table 1. Therefore, the amount of calcium carbonate is 107 kg x 0.958 = 102.5 kg. As such, the amount of calcium carbonate (CaCO3) contained in shells varies depending on the type of shell and its processing state, so it should be determined based on the type of shell to be mixed and its processing state.

[0049] Here, "processing state" includes, for example, whether or not the scallop has been aged and whether or not it has been baked, as shown in Table 1 below. Meanwhile, the molecular weight of carbon dioxide (CO2) is 44, and the molecular weight of calcium carbonate (CaCO3) is 100. As scallops grow in seawater, they absorb carbon dioxide (CO2) and chemically change into calcium carbonate (CaCO3). However, the carbon (C) itself does not increase or decrease but remains constant (1:1). Therefore, the amount of carbon dioxide (CO2) that has adhered to the calcium carbonate (CaCO3) is 44% (44 / 100). Therefore, 102.5 kg x 0.44 = 45.1 kg, which means that 45.1 kg of carbon dioxide (CO2) has adhered.

[0050] The bottom of Figure 9 includes the cases when no shells are mixed into the mix (left table) and when shells are mixed into the mix (right table). The left table, like Figure 8, shows that when no shells are mixed into the mix, 43.61 kg of carbon dioxide (CO2) is emitted. The right table shows that when shells are mixed into the mix, 45.1 kg of carbon dioxide (CO2) is trapped in the shells themselves, reducing the amount by that amount. Even though there is an increase of 1.95 kg of carbon dioxide (CO2) emitted when the shells dry, the overall emissions are 0.46 kg.

[0051] The results shown in Figure 9 show that the recycled dense granules (13F) produced using the conventional method in which scallop shells are not mixed into the composite material emit 43.61 kg of carbon dioxide (CO2), while the recycled dense granules (13F) produced using the method of the present invention in which scallop shells are mixed into the composite material emit 0.46 kg of carbon dioxide (CO2).Comparing these figures, and using the following calculation formula, it can be seen that the method of the present invention in which scallop shells are mixed into the composite material reduces carbon dioxide (CO2) by 99% compared to the conventional method.

[0052] 1-(0.46 / 43.61)×100 = 99%

[0053] Figure 7 includes a table comparing the aggregate mix of the construction material manufacturing method and carbon-neutral construction material production and use method of the present invention with a conventional method that does not include scallop shells and the present invention's method that includes scallop shells. In other words, this comparison illustrates the contents of a specific construction experiment. "Ascon" in Figure 7 refers to an asphalt mixture or asphalt mix that is made with higher hardness and density than general asphalt. Figure 7 shows two tables, the top table showing the mix ratio by weight of each type of aggregate. The "Original Mix" column shows the conventional method that does not include scallop shells, while the "Recycled Dense Granules (13F) + Scallop" column shows the present invention's method that includes scallop shells. As can be seen from the table, the present invention uses 10.7% by weight of scallop shells in the production of the mix. Note that the amounts of No. 6 crushed stone, No. 7 crushed stone, and other sand components are reduced by the amount of scallop shells mixed into the original mix. The table below Figure 7 shows the percentage of each sieve that passed through for the "original blend" and "regenerated dense granules (13F) + scallops" cases.

[0054] Here, we will explain the method for manufacturing shells in the present invention's construction material manufacturing method and method for achieving carbon neutrality in the production and use of construction materials, as well as the method for manufacturing a composite material incorporating the shells. In this invention, shell powder prepared by a predetermined method is used as one of the elements to be mixed into the composite material. The production and use of construction materials, including the shell manufacturing method, will be explained according to the sequence chart in Figure 1A. In this embodiment of the present invention, scallop shells are used as the shells. After scallops are caught, their contents are removed from the shells, and the shells are collected and transported to a predetermined location (Step S1). The shells are then transported to an appropriate shell storage location outdoors, exposed to wind, rain, and sunlight, and piled and stored (Step S2). The shell storage location should preferably be approximately 3300m2 in size. The shells piled and stored in the shell storage location are then left exposed to wind, rain, and sunlight for a predetermined period of time (Step S3). This process is called aging, and the shells are left to stand for at least six months, preferably one year or more (less than two years).

[0055] Once aged, the shells are dumped into a hopper inside the factory using a tire shovel (Step S4). Each dump weighs 1.5 tons. The shells dumped into the hopper are then transported on a belt conveyor, where workers visually inspect the shells on the belt and remove any foreign matter found (Step S5). After visual inspection, the shells are then dumped into a rotary kiln on the belt conveyor (Step S6). The shells in the rotary kiln are fired at around 700°C, taking approximately 30 minutes from the time they are dumped until they are removed (Step S7). The fired shells are then transported to a bucket conveyor where they are crushed in the first crusher (Step S8).

[0056] The crushed shells are passed through a 3mm sieve by a sifter and separated (classified) into shells over 3mm and those under 3mm (step S9). The classified shells under 3mm are transported by a belt conveyor into a product tank and stored (step S10). Meanwhile, the classified shells over 3mm are re-crushed in a second crusher (step S11). The shells re-crushed in step S11 are sieved again, and those under 3mm are stored in the product tank. The shells crushed to a specified size and stored in the product tank are weighed in specified amounts and bagged (step S12).

[0057] Table 1 below shows the results of an analysis of the main components of a sample of scallop shell powder obtained at the request of one of the co-applicants of the present application to the Hokkaido Environmental Science and Technology Center, a general incorporated association.

[0058] [Table 1]

[0059] As is clear from the analysis results in Table 1, the main component of scallop shells is calcium carbonate (CaCo3), with 90.4 wt% without aging or firing (No. 1), 91.9 wt% with aging only and without firing (No. 2), and 95.8 wt% with aging and firing (No. 3). The content of another component, magnesium carbonate (MgCO3), decreases from No. 1 to No. 3, while the content of another component, sodium (Na), remains almost unchanged from No. 1 to No. 3. These analysis results show that when aging and firing are performed, the amount of magnesium carbonate (MgCO3) decreases, while the amount of calcium carbonate (CaCo3) increases, compared to when these processes are not performed.

[0060] Returning to FIG. 1A, the crushed and classified shells bagged in step S12 are transported to a location where construction material mixes are produced in step S13, where they are mixed with recycled mixes and aggregates in step S14. Specifically, 107 kg of scallop shells are mixed with a recycled dense-graded asphalt mixture (13F) consisting of 500 kg of recycled mixes, 30 kg of new asphalt binder, and 363 kg of aggregate to produce 1,000 kg of construction material. Note that the process described in step S14 above is an example, and a new asphalt mixture can be used instead of the recycled dense-graded asphalt. As a specific example, 107 kg of the scallop shells can be mixed with a dense-graded asphalt mixture (13) consisting of 60 kg of new binder and 833 kg of aggregate to produce 1,000 kg of construction material.

[0061] Whether using recycled dense-graded asphalt or new dense-graded asphalt, there is a range of material blending ratios for the mix, and each material can be increased or decreased as appropriate. Furthermore, the type of mixture used to produce the mix is ​​not limited to dense gradation; any appropriate mixture can be used as needed. In the above embodiment, 107 kg of scallop shells were mixed with 1,000 kg of construction materials, resulting in a shell content of 10.7%. However, this content can be adjusted as appropriate depending on the conditions at the construction site. However, if the shell content is too low, the amount of carbon dioxide (CO2) that can be fixed will also decrease, reducing the carbon-neutral effect. On the other hand, if the shell content is too high, it will be difficult to ensure the physical strength of the mix. Therefore, in the present invention, crushed shells are mixed with other aggregate components in a range of 7 to 20% by weight, thereby ensuring the physical strength of the mix while also achieving the carbon-neutral effect.

[0062] The construction materials generated in step S14 are transported to the required construction site for road construction, tunnel construction, etc. in the next step S15, and in the next step S16, the required amount is used for the construction site and the construction work is carried out.

[0063] Another example of the present invention's method for manufacturing construction materials and the method for achieving carbon neutrality in the production and use of construction materials will now be described. In the above-described embodiment, crushed shells are mixed with other aggregate components to produce a composite, which is then mixed with asphalt or cement to produce the construction material. However, crushed shells can also be mixed with coarse particles to produce the construction material. This construction material is used as a material for the frost heave suppression layer, which is part of the roadbed. Volcanic ash, sand, and cut gravel can be used as the coarse particles to be mixed with the crushed shells. The frost heave suppression layer forms part of the roadbed beneath the pavement and prevents problems caused by freezing of the roadbed in cold regions, such as cracks, heaves, and other deformations on the road surface, as well as a decrease in the bearing capacity of the roadbed during the thawing period. This point will be discussed later in connection with an embodiment.

[0064] Another example of the method for manufacturing construction materials of the present invention and the method for achieving carbon neutrality in the production and use of construction materials of the present invention will now be described. In the method for manufacturing construction materials of the present invention and the method for achieving carbon neutrality in the production and use of construction materials of the present invention described using Figure 7 etc., seashells were crushed and mixed in a predetermined ratio with the construction material mix, but the crushed shells obtained by processing, crushing and classifying the shells using the method described in Figure 1A can be mixed with synthetic resin and placed on an existing paved road. Also, as will be described later, crushed seashells can be mixed with synthetic resin and placed on a paved road made from construction materials used in the method for manufacturing construction materials of the present invention and the method for achieving carbon neutrality in the production and use of construction materials of the present invention, rather than on an existing paved road.

[0065] Here, we will explain another preferred embodiment of the method for manufacturing a construction material of the present invention, a portion of which is shown in FIG. 1B, and the method for achieving carbon neutrality in the production and use of the construction material of the present invention. For convenience, one preferred embodiment of the method for manufacturing a construction material of the present invention and the method for achieving carbon neutrality in the production and use of the construction material of the present invention, which is described in FIG. 1A, will be referred to as the first embodiment. FIG. 1B shows a second embodiment, which includes a process in step S14 shown in FIG. 1A that is different from that of the first embodiment shown in FIG. 1A. Similarly, FIG. 1C shows a third embodiment, which includes a process in step S14 shown in FIG. 1A that is different from that of the first embodiment shown in FIG. 1A and the second embodiment shown in FIG. 1B.

[0066] Next, a second embodiment will be described with reference to FIG. 1B. FIG. 1B includes steps S14-1 to S14-8 in the second embodiment instead of step S14 in FIG. 1A. In step S14-1 following step S13, the amount of carbon dioxide (CO2) (A) generated per unit weight during the production of aggregates, etc. in construction materials is calculated. The unit weight is, for example, 1 ton. Here, the above-mentioned "aggregates, etc." refers to "aggregates and / or asphalt and / or other materials." To further explain this point, step S14 in FIG. 1A states, "Mix shells into aggregates, etc. to produce construction materials." This means that shells are mixed with one of the following seven materials: (1) aggregates only; (2) aggregates and asphalt; (3) aggregates, asphalt, and other materials; (4) asphalt only; (5) asphalt and other materials; (6) aggregates and other materials; (7) other materials only.

[0067] In step S14-2, the amount of carbon dioxide (CO2) (B) absorbed by the shells per unit weight during growth is calculated. The method for calculating this amount of carbon dioxide (CO2) (B) can be the same as that described above for the case where 10.7% by weight of scallop shells is mixed into 1 ton of mix, i.e., construction material. In this case, the weight of the scallop shells is 107 kg. The amount of calcium carbonate (CaCO3) in these scallop shells is 95.8%, as shown in No. 3 of Table 1. Therefore, the amount of calcium carbonate is 107 kg x 0.958 = 102.5 kg. Meanwhile, the molecular weight of carbon dioxide (CO2) is 44, and that of calcium carbonate (CaCO3) is 100. As scallops grow in seawater, they absorb carbon dioxide (CO2) and chemically change into calcium carbonate (CaCO3). The carbon (C) content remains constant (1:1), so the amount of carbon dioxide (CO2) bound to calcium carbonate (CaCO3) is 44% (44 / 100). Therefore, 102.5 kg x 0.44 = 45.1 kg, meaning that 45.1 kg of carbon dioxide (CO2) is bound to the shell. Therefore, the weight of the shell (in this case, a unit weight, such as 1 ton) is multiplied by the calcium carbonate content, and then multiplied by the product of the molecular weight of carbon dioxide (CO2) divided by the molecular weight of calcium carbonate. In the above example, the calcium carbonate (CaCO3) content was obtained from Table 1, but since the calcium carbonate (CaCO3) content varies depending on the type of shellfish and the processing state of the shellfish, the calcium carbonate (CaCO3) content specified by the type of shellfish used and the processing state of the shellfish will be used.

[0068] In step S14-3, the amount of carbon dioxide (CO2) (A) calculated in step S14-1 is multiplied by the weight (C) of aggregates and other materials in the construction materials (A × C) to calculate the total amount of carbon dioxide (CO2) (F) generated during the production of aggregates and other materials. In the next step S14-4, the amount of carbon dioxide (CO2) (B) calculated in step S14-2 is multiplied by the weight (E) of the painting shells to be mixed (B × E) to calculate the total amount of carbon dioxide (CO2) encapsulated and fixed (F). In the next step S14-5, the total amount of carbon dioxide (CO2) (D) obtained in step S14-3 is compared with the total amount of carbon dioxide (CO2) (F) obtained in step S14-4 to determine which is larger. In the next step S14-6, the result of the comparison in step S14-5 is displayed to determine whether (D) or (F) is larger, and in the next step S14-7, the difference between (D) and (F) is displayed. In the next step S14-8, the shells are mixed with aggregate etc. in an amount equal to the weight (E) to produce construction materials. When step S14-8 is completed, the process returns to step S15 in FIG. 1A.

[0069] In this way, in the second embodiment, (D) calculated in step S14-3 is compared with (F) calculated in step S14-4, the difference between the two is calculated, and these are displayed. This is effective when the amount of shells to be mixed is known in advance at the manufacturing stage of the construction material. In other words, if the percentage of calcium carbonate contained can be known in advance from the type of shell used and the condition of the shells, the percentage of shells to be mixed in to efficiently achieve carbon neutrality is often known empirically. In such a case, for example, this is applicable when the mixing percentage of shells is known in advance as mentioned above, that is 10.7% by weight.

[0070] Next, a third embodiment will be described with reference to FIG. 1C. Steps S14-1 to S14-3 in FIG. 1C are the same as those in FIG. 1B, and therefore will not be described here. Step S14-3 is followed by step S14-9. In step S14-9, the weight (G) of shells to be mixed, which is necessary to offset (D) calculated in step S14-3, is calculated as follows: That is, (D) calculated in step S14-3 is divided by (B) calculated in step S14-2 (G=D / B). Next, in step S14-10, shells are mixed with aggregates and the like to produce construction materials by the weight (G). After that, the process returns to step S15 in FIG. 1A.

[0071] In this way, in the third embodiment, (D) calculated in step S14-3, i.e., the total amount of carbon dioxide (CO2) generated during the stage of producing aggregates, etc. in the construction material, is calculated, and the weight (G) of shells to be mixed in to offset this (D) is calculated. Therefore, this is effective when the amount of shells to be mixed in at the stage of manufacturing the construction material is unknown.

[0072] Figure 10 is a photograph of a partially cutaway perspective view showing crushed seashells mixed with synthetic resin and laid on an existing paved road as another example of the manufacturing method of the construction material of the present invention and the method of realizing carbon neutrality in the production and use of the construction material of the present invention. In this example, crushed seashells are mixed with synthetic resin and laid on the surface of an asphalt pavement 10 to a depth of 1 m. 2 A predetermined amount of construction material 12 is placed per unit area, flattened with a roller, and made to a thickness of several centimeters. This construction material 12 is a mixture of crushed seashells and synthetic epoxy resin in a predetermined ratio. As shown in Figure 10, in this example, a white pavement surface is presented, making it possible to provide a beautifully landscaped pavement. In this example, a predetermined amount of carbon dioxide (CO2) is fixed and trapped per unit area of ​​paved surface.

[0073] In the above embodiment, the mixture of crushed seashells and synthetic resin was placed on an existing pavement. However, the mixture of crushed seashells and synthetic resin can also be placed on a pavement constructed using construction materials manufactured by the construction material manufacturing method of the present invention or by the method for achieving carbon neutrality in the production and use of construction materials of the present invention. That is, seashells are mixed into the construction materials of the asphalt pavement 10 itself, as shown in Figure 10, and the mixture of seashells and synthetic resin is placed on the surface of the pavement 10. In this case, a white pavement surface, similar to the above, is presented, providing a visually appealing pavement. A predetermined amount of carbon dioxide (CO2) per unit area of ​​pavement surface is encapsulated and fixed in both the pavement 10 itself and the white pavement surface.

[0074] Next, the application of the present invention to the aforementioned frost heave suppression layer and to other layers of road structures will be explained with reference to Figure 11. Figure 11 is a cross-sectional view showing the standard configuration of an asphalt pavement in a road structure, excerpted from "Road Design Guidelines, Volume 1: Roads," compiled by the Hokkaido Regional Development Bureau of the Ministry of Construction in April 2022. As shown in Figure 11, asphalt pavement is laid on top of the roadbed and consists of a surface layer, a base layer (middle layer), and a roadbed, from top to bottom. The roadbed includes an upper roadbed and a lower roadbed. The frost heave suppression layer is configured as part of the roadbed located below the roadbed. As mentioned above, in embodiments of the manufacturing method of construction materials of the present invention and the method for achieving carbon neutrality in the production and use of construction materials of the present invention, construction materials containing shells can be used in the frost heave suppression layer. However, the construction materials of the present invention are not limited to this, and construction materials containing shells can be used in any of the surface layer, base layer, roadbed, and roadbed shown in Figure 11. The same applies not only to asphalt pavements but also to concrete pavements. [Industrial Applicability]

[0075] According to the present invention's method for producing construction materials and the method for achieving carbon neutrality in the production and use of construction materials, seashells grow by absorbing carbon dioxide (CO2) dissolved in water, including the ocean, and their shells are primarily composed of calcium carbonate (CaCO3). By using these shells as raw materials to produce construction materials, carbon dioxide (CO2) can be efficiently encapsulated and fixed in the construction material, contributing to the realization of carbon neutrality. The amount of carbon dioxide (CO2) encapsulated and fixed in the construction material can be calculated using the calcium carbonate (CaCO3) content. When this construction material is used in road paving and construction work, carbon dioxide (CO2) is encapsulated semi-permanently, and the amount of carbon dioxide (CO2) encapsulated and fixed in the construction material can be calculated from the amount of construction material used. This construction material contributes to the realization of carbon neutrality in the construction material manufacturing industry and various construction industries, and is useful in these industries. [Explanation of symbols]

[0076] S1 Shell delivery S2 Shell storage area S3 Aging S4 Put shells into the hopper S5 Removal of foreign matter S6 Putting shells into the kiln S7 Shell firing S8 Crushing S9 classification S10 Storage S11 Re-grinding S12 Measuring bag packaging S13 Transport shells to the construction material generation area S14 Mixing shells with aggregates to create construction materials S14-1 Calculate the amount of CO2 (A) generated when producing aggregates and other construction materials per unit weight S14-2 Calculate the amount of CO2 absorbed by a shell per unit weight during growth (B) S14-3 (A) is multiplied by the weight of aggregates, etc. in the construction materials produced (C) to calculate the total amount of CO2 (D) generated during the production of aggregates, etc. S14-4 Multiply (B) by the weight of the shells (E) to calculate the total amount of CO2 encapsulated and fixed (F). S14-5 Compare (D) and (F) S14-6 Display the result of the comparison, which is larger (D) or (F) S14-7 Show the difference between (D) and (F) S14-8 Mix shells by weight (E) with aggregates to produce construction materials S14-9 Calculate the weight (G) of mixed shells required to offset (D) (G=D / B) S14-10 Mix a certain amount of shells by weight (G) with aggregates to create construction materials S15 Transporting construction materials to the construction site S16 Construction work is carried out using the required amount of construction materials. 10 Asphalt pavement 12. A construction material that provides landscape paving by mixing crushed seashells with epoxy resin, a synthetic resin, in a specified ratio.

Claims

1. 、 A method for manufacturing a construction material by mixing seashells with other materials, the method comprising the steps of: the seashells grow in water, including the ocean, absorb carbon dioxide in the water to produce calcium carbonate, which becomes the main component of the shells; calculating the amount of carbon dioxide absorbed by the shells during their growth by multiplying the weight of the shells by the calcium carbonate content, and multiplying this product by the value obtained by dividing the molecular weight of carbon dioxide by the molecular weight of calcium carbonate; and determining the amount of carbon dioxide encapsulated and fixed in the construction material.

2. 2. The method for manufacturing a construction material according to claim 1, further comprising a step of determining the content ratio of calcium carbonate in consideration of the type and processing state of the shells.

3. 3. The method for manufacturing a construction material according to claim 2, wherein the determining step uses the results of a component analysis that takes into account the type and processing state of the shells.

4. 5. The method for manufacturing a construction material according to claim 1, wherein the step of producing the construction material comprises mixing the shells in an amount ranging from 7 to 20% by weight of the construction material.

5. A construction material manufactured by the method for manufacturing a construction material according to any one of claims 1 to 4.

6. A step of calcining shells of shellfish that grow in water, including the ocean, and absorb carbon dioxide in the water to produce calcium carbonate, which is the main component of the shells; crushing the fired shells; mixing the crushed shells with other aggregates and / or asphalt and / or other materials to produce a construction material; using said construction material for paving or construction or for the manufacture of elements for use in construction; A method for achieving carbon neutrality in the production and use of construction materials, comprising: a step of multiplying the weight of the shells mixed in the step of producing the construction material by the proportion of calcium carbonate contained in the shells, and determining that the amount of carbon dioxide encapsulated and fixed in the shells is the value obtained by dividing the molecular weight of carbon dioxide by the molecular weight of calcium carbonate or by 44 / 100 of the product obtained by multiplying the product by the molecular weight of carbon dioxide. How to achieve carbon neutrality.

7. A step of calcining shells of shellfish that grow in water, including the ocean, and absorb carbon dioxide in the water to produce calcium carbonate, which is the main component of the shells; crushing the fired shells; mixing the crushed shells with other aggregates and / or asphalt and / or other materials to produce a construction material; using said construction material for paving or construction or for the manufacture of elements for use in construction; A method for achieving carbon neutrality in the production and use of construction materials, comprising: generating the construction materials, A first calculation step of calculating the amount of carbon dioxide generated (A) generated until the aggregate and / or asphalt and / or other materials in the construction material are produced per unit weight; a second calculation step of multiplying the proportion of calcium carbonate contained in the shells by the unit weight to calculate the amount of carbon dioxide (B) absorbed in the water during growth of the shells mixed in the step of producing the construction material, and multiplying the product by 44 / 100 or the molecular weight of carbon dioxide divided by the molecular weight of calcium carbonate to obtain the amount of carbon dioxide (B); and a third calculation step of multiplying the amount of carbon dioxide (A) obtained in the first calculation step by the weight (C) of the construction material to be produced to calculate the total amount of carbon dioxide (D) generated in the production stage of the aggregate and / or asphalt and / or other materials in the construction material. A fourth calculation step of multiplying the weight (E) of the shells to be mixed by the amount of carbon dioxide (B) calculated in the second calculation step to calculate the total amount of carbon dioxide (F) to be encapsulated and fixed; A step of comparing the total amount of carbon dioxide (D) obtained in the third calculation step with the total amount of carbon dioxide (F) obtained in the fourth calculation step; a step of displaying, as a result of the comparison, which of the total amount of carbon dioxide (D) and the total amount of carbon dioxide (F) is larger; Calculating and displaying the difference between the total carbon dioxide amount (D) and the total carbon dioxide amount (F); In the step of producing the construction material, mixing the weight (E) of the shells with the other aggregates and / or asphalt and / or other materials; A method for achieving carbon neutrality.

8. A step of calcining shells of shellfish that grow in water, including the ocean, and absorb carbon dioxide in the water to produce calcium carbonate, which is the main component of the shells; crushing the fired shells; mixing the crushed shells with other aggregates and / or asphalt and / or other materials to produce a construction material; using said construction material for paving or construction or for the manufacture of elements for use in construction; A method for achieving carbon neutrality in the production and use of construction materials, comprising: generating the construction materials, A first calculation step of calculating the amount of carbon dioxide generated (A) generated until the aggregate and / or asphalt and / or other materials in the construction material are produced per unit weight; a second calculation step of calculating the amount of carbon dioxide (B) absorbed in the water during growth per unit weight of the shells mixed in the step of producing the construction material by multiplying the unit weight by the proportion of the amount of calcium carbonate contained in the shells and multiplying the product by either the molecular weight of carbon dioxide divided by the molecular weight of calcium carbonate or 44 / 100 to calculate the amount of carbon dioxide (B); A third calculation step of multiplying the amount of carbon dioxide (A) obtained in the first calculation step by the weight (C) of the generated construction material to calculate the total amount of carbon dioxide (D) generated in the generation stage of the aggregate and / or asphalt and / or other materials in the construction material; A fourth calculation step of calculating the amount (G) of shells mixed in when producing the construction material necessary to offset the total amount (D) of carbon dioxide obtained in the third calculation step by dividing (D / B) the total amount (D) of carbon dioxide generated in the production stage of the construction material by the amount (B) of carbon dioxide per unit weight obtained in the second step; In the step of generating the construction material, the amount (G) of shells calculated in the fourth step is mixed with the other aggregates and / or asphalt and / or other materials; A method for achieving carbon neutrality.

9. A method for achieving carbon neutrality in the production and use of construction materials as described in claim 7 or 8, wherein the first calculation step includes calculations that include the amount of carbon dioxide emitted when materials are transported or products are transported and / or the amount of carbon dioxide emitted when electricity is generated to be used at the construction material production plant.

10. 9. A method for achieving carbon neutrality in the production and use of construction materials according to claim 7 or 8, wherein the first calculation step includes calculation of the amount of carbon dioxide emitted when the shells are burned.

11. A method for achieving carbon neutrality in the production and use of construction materials as described in any one of claims 6 to 8, wherein the step of using the construction material for paving or construction or for manufacturing elements for use in construction further comprises a step of using the construction material as material for a frost heave suppression layer that is part of the roadbed located below the roadbed.

12. A method for achieving carbon neutrality in the production and use of construction materials as described in any one of claims 6 to 8, wherein the step of using the construction material for paving or construction, or for manufacturing elements for construction, further comprises a step of using the construction material as a surface layer, base layer, or subgrade of a pavement, or as a material for the roadbed located below the subgrade.

13. A method for achieving carbon neutrality in the production and use of construction materials described in any one of claims 6 to 8, wherein the step of producing the construction material involves mixing the crushed shells in a range of 7 to 20% by weight.

14. A method for achieving carbon neutrality in the production and use of construction materials, further comprising a step of laying a predetermined thickness of crushed seashells mixed with synthetic resin on the surface of a paved road and / or building constructed by the method for achieving carbon neutrality in the production and use of construction materials described in any one of claims 6 to 8.

15. A construction material used in a method for achieving carbon neutrality in the production and use of a construction material according to any one of claims 6 to 8.

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