Resource circulation system for cement and concrete materials

Abstract

To provide a resource recycling system for cement and concrete materials that can lead to a reduction in non-energy-related CO2 emissions.SOLUTION: A resource recycling system 1 for cement and concrete materials includes nodes that each constitute a network 100 and manage data related to the production of cement and concrete materials. At least one node 10 records limestone-derived calcium content data 12 in the network 100. At least one node 20 records waste-derived calcium content data 22 in the network 100. At least one node 30 links the limestone-derived calcium content data 12 and the waste-derived calcium content data 22 to the cement and concrete material data 32 assigned to the produced cement-concrete material. The linked cement and concrete material data 32 is recorded in the network 100.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a resource circulation system for cement and concrete materials that manages the resource circulation of cement and concrete materials. [Background technology]

[0002] The Japanese government has declared that it will aim to achieve carbon neutrality, that is, to reduce greenhouse gas emissions to zero overall by 2050. "Total zero emissions" means that the total amount of greenhouse gas emissions, including carbon dioxide (CO2), minus the amount absorbed through afforestation, forest management, etc., will be reduced to essentially zero. In other words, achieving carbon neutrality requires reducing greenhouse gas emissions and preserving and strengthening absorption (see, for example, Non-Patent Document 1).

[0003] In the cement and concrete industries, Portland cement, produced by high-temperature firing using limestone as a raw material, is the primary product. This means that in addition to energy-related CO2 emissions, non-energy-related CO2 emissions during production are also significant. This necessitates the use of carbon capture, utilization, and storage (CCUS) technology in addition to the typical carbon neutralization strategies used in other sectors (see, for example, Non-Patent Document 2). One promising CCUS technology is the use of CO2 captured from exhaust gas during cement production and decarbonated calcium (Ca) derived from waste materials, such as concrete waste and by-products of concrete production, as a substitute for limestone (main component: CaCO3) in cement production. A specific example of a CCUS technology is carbonation, which involves contacting CO2 captured from exhaust gas during cement production with resources such as calcium and magnesium (Mg) to convert them into chemically stable carbonate resources, such as CaCO3 and magnesium carbonate (MgCO3). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] What is Carbon Neutral? - Decarbonization Portal - Ministry of the Environment, Internet<URL:https: / / ondankataisaku.env.go.jp / carbon_neutral / about / > [Non-patent document 2] Takafumi Noguchi / Towards a Carbon Neutral Era - Expectations for Cement, Cement & Concrete, No. 900, pp. 4-9, 2022 Summary of the Invention [Problem to be solved by the invention]

[0005] By using decarbonated calcium derived from waste materials such as waste and by-products as an alternative raw material for limestone, it is possible to reduce non-energy-related CO2 emissions by reducing the amount of natural limestone used. However, because it is difficult to determine whether the calcium used was produced from decarbonated calcium derived from waste materials, it has been difficult to determine whether non-energy-related CO2 emissions have actually been reduced.

[0006] In other words, in order to understand whether non-energy-related CO2 emissions are being reduced, it is necessary to clearly distinguish whether the limestone used was produced from already decarbonated calcium derived from waste, etc. Therefore, the present invention aims to provide a resource circulation system for cement and concrete materials that can lead to a reduction in non-energy-origin CO2 emissions by managing data on the amount of limestone-derived calcium and data on the amount of calcium derived from waste, etc., which are resources used to produce cement and concrete-based materials such as cement, mortar, and concrete, and by clarifying whether the Ca used has been produced from already decarbonated Ca derived from waste, etc., and by understanding the amount of non-energy-origin CO2 emissions in the movement of cement and concrete-based materials (from production to disposal). [Means for solving the problem]

[0007] After extensive research to solve the above problems, we discovered that the above problems can be solved by managing data on the amount of calcium derived from limestone and waste, which are resources used to produce cement and concrete materials, over a network, in order to clearly determine whether the limestone used was produced using already decarbonated calcium derived from waste, etc. The present invention was completed based on the above findings. The present invention is as follows.

[0008] [1] A resource circulation system for cement and concrete-based materials comprising nodes that form a network and manage data related to the production of cement and concrete-based materials, wherein at least one of the nodes calculates the amount of limestone-derived calcium, which is obtained from limestone as a raw material, of the calcium used in the production of cement and concrete-based materials, generates data on the calculated amount of limestone-derived calcium, and records the data on the network; at least one of the nodes calculates the amount of already decarbonated calcium, which is obtained from waste and by-products as raw materials, of the calcium used in the production of cement and concrete-based materials, generates data on the calculated amount of waste-derived calcium, and records the data on the network; and at least one of the nodes links the limestone-derived calcium amount data and the waste-derived calcium amount data to cement and concrete-based material data assigned to the produced cement and concrete-based materials, and records the linked cement and concrete-based material data on the network. [2] A resource circulation system for cement and concrete-based materials described in [1], wherein at least one of the nodes keeps track of the movement of the produced cement and concrete-based materials and records tracking data in the network. [3] A resource circulation system for cement and concrete-based materials described in [1] or [2], in which at least one of the nodes identifies cement and concrete-based materials in which the proportion of calcium derived from limestone among the calcium used in the production is 98% or less. [4] A resource circulation system for cement and concrete-based materials according to any one of [1] to [3], wherein the cement and concrete-based material is at least one of cement, mortar, and concrete. [5] A resource circulation system for cement and concrete materials described in any of [1] to [4], in which the method for distinguishing between calcium derived from limestone and calcium derived from waste, etc., is a comprehensive judgment based on the analysis results of particle shape observation using SEM, quantification of trace elements using XRF, and quantification of trace elements using ICP-OES. [6] A resource circulation system for cement and concrete materials described in any one of [1] to [5], wherein the network is a blockchain network. [7] A resource circulation system for cement and concrete-based materials described in any of [1] to [6], wherein at least one of the nodes adds data on the amount of CO2 emissions from energy sources when limestone-derived calcium is used, and at least one of the nodes adds data on the amount of calcium from waste, etc., when decarbonated calcium is used, and the amount of calcium from waste, etc., is added to the amount of calcium from waste, etc., which is made from waste and by-products. [Effects of the Invention]

[0009] According to the present invention, by managing data on the amount of calcium derived from limestone and the amount of calcium derived from waste, etc., which are resources used to produce cement and concrete-based materials, it is possible to clarify whether the calcium used has been produced from already decarbonated calcium derived from waste, etc., and by understanding the amount of non-energy-derived CO2 emissions in the movement of cement and concrete-based materials (from production to disposal), it is possible to provide a resource circulation system for cement and concrete-based materials that can lead to a reduction in non-energy-derived CO2 emissions. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a conceptual diagram showing an example of a resource circulation system for cement / concrete-based materials according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] A resource circulation system 1 for cement and concrete-based materials according to an embodiment of the present invention (hereinafter sometimes simply referred to as "this embodiment") includes nodes 10, 20, 30, 40, 50, and 60, each of which constitutes a network 100 and manages data related to the production of cement and concrete-based materials, as shown in Figure 1. The cement and concrete-based materials in this specification are at least one of cement, mortar, and concrete.

[0012] The network 100 of the present invention connects nodes on an information and communication network, and uses cryptographic technology to process and record limestone-derived calcium content data, waste-derived calcium content data, and cement and concrete material data in a distributed manner. The network 100 is an information and communication network such as the Internet, an intranet, a cloud network, or a blockchain network, and is preferably a blockchain network. By using digital signatures and hash pointers, the network 100 can achieve high availability and data integrity by storing the data, which has a data structure that makes tamper detection easy, across multiple distributed nodes. A consortium-type blockchain is preferably used as the blockchain network, but other formats, such as a public blockchain, may also be used.

[0013] The number of nodes in the resource circulation system 1 for cement and concrete-based materials is six in Fig. 1, but is not limited to six and may be five or less, or seven or more. The nodes in the resource circulation system 1 for cement and concrete-based materials are connected to each other via a network 100 so that they can communicate with each other. Each node has a storage unit capable of storing the above data. As the storage unit, for example, a storage medium such as a ROM, a RAM, or a hard disk can be adopted. Each node has an input unit that inputs and stores data in the storage unit. The input unit can be a user interface of an information processing device, such as a mouse, keyboard, touch panel, or voice input device.

[0014] At least one node 10 constituting the network 100 calculates the amount of limestone-derived Ca from limestone, among the calcium used in the production of cement and concrete materials. A method for calculating the amount of limestone-derived Ca from limestone, which is used as a raw material, will be described later. Then, the node 10 generates limestone-derived calcium amount data 12 from the calculated amount of limestone-derived calcium, which is made from limestone. The limestone-derived calcium amount data 12 is data on the amount of limestone-derived calcium, which is made from limestone, among the calcium used in cement and concrete materials. Then, the node 10 records the limestone-derived calcium amount data 12 in the memory unit 11 provided in the node 10. Recording the limestone-derived calcium amount data 12 in the memory unit 11 provided in the node 10 constituting the network 100 is synonymous with recording the limestone-derived calcium amount data 12 in the network 100.

[0015] At least one node 20 constituting the network 100 calculates the amount of Ca derived from already decarbonated waste, etc. derived from waste, etc. made from waste and by-products as raw materials out of the calcium used in the production of cement and concrete materials. A method for calculating the amount of Ca derived from already decarbonated waste, etc. derived from waste, etc. made from waste and by-products as raw materials will be described later. Then, the node 20 generates waste-derived calcium amount data 22 from the calculated amount of already decarbonated waste-derived calcium derived from waste etc. that is made from waste and by-products as raw materials. The waste-derived calcium amount data 22 is data on the amount of already decarbonated waste-derived Ca derived from waste etc. that is made from waste and by-products as raw materials out of the calcium used in cement and concrete-based materials. Then, the node 20 records the waste-derived calcium amount data 22 in the memory unit 21 provided in the node 20. Recording the waste-derived calcium amount data 22 in the memory unit 21 provided in the node 20 constituting the network 100 is synonymous with recording the waste-derived calcium amount data 22 in the network 100.

[0016] Below is an example of how to calculate the amount of calcium derived from limestone when limestone is used as a raw material, and the amount of calcium derived from decarbonated waste, etc., when waste and by-products are used as raw materials. First, we present Equation (1) for calculating the carbon dioxide fixation rate (mass%) due to the carbonation reaction of cement and concrete materials. CO2=0.7848(CaO-0.5603CaCO3-0.7005SO3)+1.092MgO+1.420Na2O+0.9344K2O…(1) The process of deriving each coefficient in equation (1) is shown below. 0.7848≒CO2 (molecular weight 44.01g / mol) ÷ CaO (molecular weight 56.0774g / mol) 0.5603≒CaO(molecular weight 56.08g / mol)÷CaCO3(molecular weight 100.087g / mol) 0.7005≒CaO (molecular weight 56.08g / mol) ÷ SO3 (molecular weight 80.06g / mol) 1.092≒CO2 (molecular weight 44.01g / mol) ÷ MgO (molecular weight 40.3044g / mol) 1.420≒2×CO2(molecular weight 44.01g / mol)÷Na2O(molecular weight 61.979g / mol) 0.9344≒2×CO2(molecular weight 44.01g / mol)÷K2O(molecular weight 94.196g / mol) Next, we show formula (2) for calculating the amount of calcium carbonate (CaCO3) in cement-concrete materials derived from formula (1). CaCO3 amount = 1.785CaO-1.250SO3-2.274CO2+2.483MgO+3.229Na2O+2.126K2O…(2) The chemical composition of the cement / concrete material is calculated by determining the mass percentages of CaO, SO3, MgO, Na2O, and K2O, as well as the mass percentage of CO2. The mass percentages of the chemical components and the mass percentage of CO2 in the cement / concrete material can be determined through analysis. For example, the mass percentage of CO2 can be calculated by total carbon analysis of the gas released after heating and completely oxidizing the material, or by infrared CO2 analysis. The mass percentages of the chemical components and the mass percentage of CO2 in the cement / concrete material are then substituted into equation (2) to calculate the amount of calcium carbonate (CaCO3) in the cement / concrete material. The calculated amount of calcium carbonate (CaCO3) corresponds to the amount of decarbonated calcium carbonate derived from limestone and waste materials made from waste and by-products. Next, we show formula (3) for calculating the amount of calcium oxide (CaO) contained in calcium carbonate from the amount of calcium carbonate (CaCO3 amount) in cement / concrete materials calculated using formula (2). CaO amount in CaCO3=CaCO3 amount×CaO molecular weight (56.08g / mol) / CaCO3 molecular weight (100.087g / mol)=CaCO3 amount×0.5604…(3) The net amount of calcium oxide (CaO) in the cement / concrete material is calculated by subtracting the amount of calcium oxide (CaO) contained in calcium carbonate (CaCO3) and gypsum (CaSO4) from the calcium oxide content (mass%) in the cement / concrete material. The calculated net amount of calcium oxide (CaO) corresponds to the amount of CaO that has already been decarbonated from waste, etc.

[0017] Examples of already decarbonated waste-derived calcium derived from wastes and by-products include by-product slaked lime such as acetylene by-product slaked lime, waste concrete blocks, fine powder generated from waste concrete blocks, concrete sludge (dewatered cake) generated in ready-mix concrete plants and concrete product plants, incineration ash (coal ash, woody biomass, municipal waste incineration ash, sewage sludge incineration ash, etc.), and steel slag (converter slag, electric furnace slag, etc.). Among these, by-product slaked lime is preferred because it contains fewer impurities than already decarbonated waste-derived calcium derived from other wastes and by-products. Examples of by-product slaked lime include by-product slaked lime produced during the acetylene gas production process using the calcium carbide method (wet and dry types are available depending on the acetylene gas production method), and by-product slaked lime contained in the dust captured during the wet dust collection process of a calcium carbide electric furnace. By-product slaked lime contains, for example, 65 to 95% (preferably 70 to 90%) calcium hydroxide, 1 to 10% calcium carbonate, and 0.1 to 6.0% (preferably 0.1 to 3.0%) iron oxide. These proportions can be confirmed by X-ray fluorescence measurement and mass loss determined by differential thermogravimetric analysis (TG-DTA) (Ca(OH)2: approximately 405 to 515°C, CaCO3: approximately 650 to 765°C). The volume-average particle size measured by laser diffraction / scattering is approximately 50 to 100 μm. Furthermore, the moisture content measured by the loss on drying method in JIS K 0068 "Method for measuring moisture content in chemical products" is preferably 10% or less. Also, sulfur compounds such as CaS, A12S3, and CaC2·CaS may be contained, but the content is preferably 2% or less.

[0018] At least one node 30 constituting the network 100 links limestone-derived calcium amount data 12 and waste-derived calcium amount data 22 to cement / concrete-based material data 32 assigned to the produced cement / concrete-based material. Then, the node 30 records the cement-concrete material data 32 linked to the limestone-derived calcium amount data 12 and the waste-derived calcium amount data 22 in the memory unit 31 provided in the node 30. Recording the cement-concrete material data 32 linked to the limestone-derived calcium amount data 12 and the waste-derived calcium amount data 22 in the memory unit 31 provided in the node 30 constituting the network 100 is synonymous with recording the cement-concrete material data 32 linked to the limestone-derived calcium amount data 12 and the waste-derived calcium amount data 22 in the network 100.

[0019] At least one node 40 constituting the network 100 refers to the cement / concrete-based material data 32, keeps track of the movement of the produced cement / concrete-based material, and creates tracking data (not shown) in the network 100. Then, the node 40 records the tracing data in the storage unit 41 provided in the node 40. Recording the tracing data in the storage unit 41 provided in the node 40 that constitutes the network 100 is synonymous with recording the tracing data in the network 100. By recording the tracking data on the network 100 and accessing the network 100 and referring to the tracking data, it is possible to grasp the movement of cement and concrete materials (from production to disposal), and by using the limestone-derived calcium amount data 12 and the waste etc.-derived calcium amount data 22 linked to the cement and concrete material data 32 of the cement and concrete material, it is possible to grasp the movement of the amount of limestone-derived calcium and the amount of waste etc.-derived calcium used in the cement and concrete material.

[0020] At least one node 50 constituting the network 100 calculates the ratio of limestone-derived calcium in the calcium used in the production of the cement / concrete-based material and creates ratio calculation data (not shown) by referring to the cement / concrete-based material data 32 linked to the limestone-derived calcium amount data 12 and the waste-derived calcium amount data 22. Then, the node 50 refers to the ratio calculation data, identifies cement / concrete-based materials in which the ratio of limestone-derived calcium is 98% or less, and records in the cement / concrete-based material data 32 of the cement / concrete-based material in which the ratio of limestone-derived calcium is 98% or less to the effect that the ratio is an excellent ratio. Then, the node 50 records the ratio calculation data in the storage unit 51 provided in the node 50. Recording the ratio calculation data in the storage unit 51 provided in the node 50 that constitutes the network 100 is synonymous with recording the ratio calculation data in the network 100. By using cement and concrete materials in which the ratio of limestone-derived calcium identified by node 50 is 98% or less, it is possible to reduce non-energy-related CO2 emissions by reducing the amount of natural limestone used, which can lead to a reduction in CO2 emissions. Although a significant reduction in CO2 emissions can be achieved by setting the ratio of limestone-derived calcium identified by node 50 to 98% or less, the identification threshold is not limited to 98%; for example, it could be 96% or 94%, which will provide a sufficient reduction in CO2 emissions.

[0021] At least one node 60 constituting the network 100 generates raw material identification data (not shown) that identifies whether the calcium used in the production of the cement / concrete material is limestone-derived calcium or waste-derived calcium. For example, the node 60 can generate the raw material identification data by referencing the cement / concrete material data 32 linked to the limestone-derived calcium amount data 12 and the waste-derived calcium amount data 22. In addition, node 60 can include in the raw material identification data the ratio of calcium derived from limestone and calcium derived from waste, etc., in the calcium used in the production of cement / concrete-based materials. Then, the node 60 records the ingredient identification data in the storage unit 61 provided in the node 60. Recording the ingredient identification data in the storage unit 61 provided in the node 60 constituting the network 100 is synonymous with recording the ingredient identification data in the network 100. Methods for distinguishing whether calcium used in the production of cement and concrete materials is limestone-derived calcium or waste-derived calcium include, in addition to referring to cement and concrete material data32, observing particle shape with an SEM, quantifying trace elements with XRF, and quantifying trace elements with ICP-OES. It is preferable to comprehensively determine the calcium used in the production of cement and concrete materials based on the results of SEM observation of particle shape, XRF quantification, and ICP-OES quantification.

[0022] According to the resource circulation system 1 for cement and concrete materials of this embodiment, the limestone-derived calcium amount data 12 and the waste-derived calcium amount data 22 are linked to the cement and concrete material data 32 assigned to the produced cement and concrete materials. Therefore, by referring to the cement and concrete material data 32, it is possible to clarify whether the limestone used as a raw material was produced from already decarbonated Ca derived from waste, etc., and the amount of waste-derived calcium used as a raw material. Furthermore, according to the resource circulation system 1 for cement and concrete materials of this embodiment, data on the amount of calcium derived from limestone and data on the amount of calcium derived from waste, etc., which are resources used to produce cement and concrete materials, are managed, and by ensuring that the majority of the limestone used as a raw material is limestone produced from already decarbonated Ca derived from waste, etc., it becomes possible to reduce non-energy-related CO2 emissions by reducing the amount of natural limestone used, which can lead to a reduction in CO2 emissions.

[0023] [Modification of the embodiment] The resource circulation system 1 for cement and concrete materials according to this embodiment may further include a node and a memory unit (not shown) for handling ownership data regarding the ownership of cement and concrete materials and resources used to produce the cement and concrete materials. The ownership data indicates the origin and location of cement and concrete materials and resources, and is used to manage the origin and location of cement and concrete materials and resources. By recording the ownership data on the network 100 so that it moves with the movement of cement and concrete materials and resources, the current location, as well as the origin and past locations of cement and concrete materials and resources, can be managed. Managing the ownership data also makes it possible to understand the movement of the amount of limestone-derived calcium used in cement and concrete materials and the amount of calcium derived from waste, etc. Owners recorded as ownership data include, but are not limited to, manufacturers and importers / exporters who may own cement / concrete materials and resources, demolition companies, recycling companies, consulting companies, design companies, construction companies, research institutes, owners of cement / concrete structures, transporters, trading companies, agents, wholesalers / cooperatives, etc. Owners recorded as ownership data can be recorded as co-owners if there are two or more owners.

[0024] [Other embodiments] The above explanation has focused on reducing non-energy-related CO2 emissions, and has not specifically mentioned energy-related CO2 emissions, but resource circulation system 1 for cement and concrete-based materials can be a system that includes data on energy-related CO2 emissions. If resource circulation system 1 for cement and concrete-based materials is a system that includes data on energy-related CO2 emissions, it can help understand the total CO2 emissions, which is the sum of non-energy-related CO2 emissions and energy-related CO2 emissions, and lead to a reduction in total CO2 emissions.

[0025] Specifically, at least one node 10 constituting the network 100 adds data on the amount of CO2 emitted from energy used when limestone-derived Ca is used, to the limestone-derived calcium amount data 12. The data on the amount of CO2 emitted from energy used when limestone-derived Ca is used includes data on the amount of CO2 emitted up to the production of limestone-derived Ca (first amount of CO2 emitted from energy) and data on the amount of CO2 emitted up to the production of cement / concrete materials using limestone-derived Ca (second amount of CO2 emitted from energy). The first energy-related CO2 emissions are the total amount of CO2 emitted from obtaining limestone-derived calcium, for example, through raw material procurement, manufacturing, logistics, sales, etc. The second energy-related CO2 emissions are the total amount of CO2 emitted from turning limestone-derived calcium into cement and concrete materials, for example, through fuel combustion, electricity use, etc.

[0026] Furthermore, at least one node 20 constituting the network 100 adds data on the amount of CO2 emitted from energy when using already decarbonated Ca derived from waste, etc., made from waste and by-products as raw materials, to the waste-derived calcium amount data 22. The data on the amount of CO2 emitted from energy when using already decarbonated Ca derived from waste, etc., made from waste and by-products as raw materials includes data on the amount of CO2 emitted up to the production of already decarbonated Ca derived from waste, etc. (third energy-derived CO2 emissions) and data on the amount of CO2 emitted up to the production of cement / concrete-based materials using already decarbonated Ca derived from waste, etc. (fourth energy-derived CO2 emissions). The third CO2 emissions from energy sources are the total amount of CO2 emitted, for example, from the time of obtaining decarbonated calcium derived from waste materials made from waste and by-products during raw material procurement, manufacturing, logistics, sales, etc. The fourth CO2 emissions from energy sources are the total amount of CO2 emitted, for example, from the time of turning decarbonated calcium derived from waste materials made from waste and by-products into cement and concrete materials through fuel combustion, electricity use, etc.

[0027] According to another embodiment of the resource circulation system 1 for cement and concrete based materials, data on the amount of CO2 emissions from energy origin when using limestone-derived Ca made from limestone as a raw material is added to the limestone-derived calcium amount data 12, and data on the amount of CO2 emissions from energy origin when using already decarbonated waste-derived Ca made from waste and by-products as raw materials is added to the waste-derived calcium amount data 22, thereby making it possible to create a resource circulation system for cement and concrete based materials that makes it possible to grasp the total amount of CO2 emissions including energy-derived CO2 emissions. [Industrial Applicability]

[0028] This invention is a resource circulation technology in the cement industry that manages data on the amount of limestone-derived calcium in circulating cement and concrete materials and data on the amount of decarbonated calcium derived from waste, etc., on a network. This makes it possible to grasp the amount of non-energy-derived CO2 emissions in the movement of cement (from production to disposal), which can lead to a reduction in CO2 emissions. Furthermore, the present invention can contribute to understanding the total CO2 emissions, which is the sum of non-energy-related CO2 emissions and energy-related CO2 emissions, in resource circulation in the cement sector, and to reducing the total CO2 emissions. [Explanation of symbols]

[0029] 1 Resource circulation system for cement and concrete materials 10, 20, 30, 40, 50, 60 nodes 11,21,31,41,51,61 Storage section 12 Limestone-derived calcium content data 22 Calcium content data from waste, etc. 32 Cement and concrete material data 100 Network

Claims

1. A resource circulation system for cement and concrete materials, comprising nodes each constituting a network and managing data relating to the production of cement and concrete materials, and managing limestone-derived calcium amount data and waste-derived calcium amount data of circulating resources of the cement and concrete materials through the network, At least one of the nodes calculates the amount of limestone-derived calcium, which is derived from limestone as a raw material, among the calcium used in the production of cement / concrete-based materials, generates the limestone-derived calcium amount data from the calculated amount of limestone-derived calcium, and records the limestone-derived calcium amount data on the network; At least one of the nodes calculates the amount of calcium that has already been decarbonated from waste or other materials made from waste or by-products, among the calcium used in the production of cement and concrete materials, generates data on the amount of calcium derived from the waste or other materials from the calculated amount of calcium that has already been decarbonated from the waste or other materials, and records the data on the amount of calcium derived from the waste or other materials on the network; At least one of the nodes assigns cement / concrete-based material data obtained by linking the limestone-derived calcium amount data and the waste-derived calcium amount data for each produced cement / concrete-based material, and records the cement / concrete-based material data on the network; The limestone-derived calcium amount data is data on the amount of calcium derived from limestone among the calcium used in the cement / concrete-based material, the node records the limestone-derived calcium amount data, the waste-derived calcium amount data, and the cement-concrete-based material data in a storage unit included in the node, which is synonymous with recording the limestone-derived calcium amount data, the waste-derived calcium amount data, and the cement-concrete-based material data on the network, The method for calculating the amount of limestone-derived calcium and the amount of waste-derived calcium is as follows: first, the amount of calcium carbonate in the cement-concrete-based material is calculated by substituting the contents (mass%) of the chemical components in the cement-concrete-based material and the carbon dioxide content (mass%) into formula (2), which is derived from formula (1) for calculating the carbon dioxide fixation rate (mass%) due to the carbonation reaction of the cement-concrete-based material; next, the amount of limestone-derived calcium contained in the calcium carbonate is calculated by substituting the amount of calcium carbonate in the cement-concrete-based material into formula (3); and then, the amount of limestone-derived calcium derived from limestone, which is contained in the calcium carbonate, is calculated by subtracting the amount of limestone-derived calcium derived from limestone from the total amount of calcium oxide in the cement-concrete-based material; The network is a blockchain network, a resource circulation system for cement and concrete materials. CO 2 =0.7848(CaO-0.5603CaCO 3 -0.7005SO 3 )+1.092MgO+1.420Na 2 O+0.9344K 2 O…(1) CaCO 3 Quantity = 1.785CaO - 1.250SO 3 -2.274CO 2 +2.483MgO +3.229Na 2 O + 2.126K 2 O…(2) CaO amount in CaCO 3 =CaCO 3 Amount × CaO molecular weight (56.08 g / mol) / CaCO₃ 3 Molecular weight (100.087 g / mol) = CaCO₃ 3 Quantity × 0.5604… (3)

2. At least one of the nodes creates tracking data indicating the movement of the produced cement / concrete-based material from production to disposal, and records the tracking data in the network to track the movement of the produced cement / concrete-based material. The resource circulation system for cement / concrete-based materials according to claim 1, wherein the node records the tracking data in a memory unit provided in the node, which is equivalent to recording the tracking data in the network.

3. At least one of the nodes calculates the ratio of limestone-derived calcium in the calcium used in the production of the cement-concrete-based material by referring to the cement-concrete-based material data to which the limestone-derived calcium amount data and the waste-derived calcium amount data are linked, creates ratio calculation data from the calculated limestone-derived calcium ratio, and identifies the cement-concrete-based material in which the ratio of limestone-derived calcium in the calcium used in the production is 98% or less by referring to the ratio calculation data. In addition, the resource circulation system for cement / concrete-based materials described in claim 1, wherein the node records the ratio calculation data in a memory unit provided in the node, which is equivalent to recording the ratio calculation data in the network.

4. 2. The resource circulation system for cement / concrete-based materials according to claim 1, wherein the cement / concrete-based material is at least one of cement, mortar, and concrete.

5. At least one of the nodes comprehensively determines whether calcium used in the production of the cement / concrete material is calcium derived from limestone or calcium derived from waste, etc., based on the results of analysis of particle shape observation by SEM, trace element quantification by XRF, and trace element quantification by ICP-OES, and creates raw material identification data based on the identification results. The resource circulation system for cement / concrete-based materials according to claim 1, wherein the node records the raw material identification data in a memory unit provided in the node, which is equivalent to recording the raw material identification data on the network.

6. At least one of the nodes uses limestone-derived calcium from limestone. ２ As data on emissions, the first energy-derived CO emitted until obtaining the limestone-derived calcium ２ The amount of CO emitted is calculated and acquired, and the second energy-origin CO emitted until the limestone-derived calcium becomes the cement / concrete material is calculated and acquired. ２ Calculate and acquire the amount of CO emitted from the energy source. ２ The first energy-origin CO from the data on emissions ２ The total amount of CO emitted and the second energy-derived CO ２ Add the total amount of discharged calcium to the limestone-derived calcium amount data, At least one of the nodes uses already decarbonated calcium derived from waste or by-products as raw materials. ２ As data on emissions, the third energy-origin CO emitted until obtaining already decarbonated calcium derived from the waste, etc. ２ The fourth energy-origin CO emitted from the already decarbonated calcium derived from the waste, etc., until it is converted into the cement / concrete material is calculated and acquired. ２ Calculate and acquire the amount of CO emitted from the energy source. ２ From the data on emissions, the third energy-derived CO ２ Total amount of emissions and the fourth energy-derived CO ２ The total amount of discharged calcium is added to the data on the amount of calcium derived from the waste, etc. The node stores the energy-origin CO ２ By recording data on emissions, the network can ２ The resource circulation system for cement / concrete-based materials according to claim 1, which is synonymous with recording data on emissions.

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