Resource recycling 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), will be subtracted from the amount of absorption through afforestation, forest management, etc., to make the total essentially zero. In other words, to achieve carbon neutrality, it is necessary to reduce greenhouse gas emissions and to preserve and strengthen absorption (see, for example, Non-Patent Document 1).

[0003] In the cement and concrete field, Portland cement, which is produced by high-temperature burning using limestone as a raw material, is the main product, and in addition to energy-derived CO2 emissions, non-energy-derived CO2 emissions during production are also large, and in addition to general carbon neutrality measures in other fields, CCUS (carbon capture, utilization, and storage) technology is also required (see, for example, Non-Patent Document 2). As a CCUS technology, a technology is expected to use CO2 recovered from exhaust gas during cement production and CaO components as already decarbonated calcium (Ca) derived from waste materials such as concrete waste and by-products of concrete production as raw materials, as an alternative raw material for limestone (main component: CaCO3) in cement production. Specifically, as a CCUS technology, a carbonation technology is effective in which CO2 recovered from exhaust gas during cement production is brought into contact with resources such as Ca and magnesium (Mg) to convert it into carbonate resources such as chemically stable 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, since it is difficult to determine whether the calcium used was produced from decarbonated calcium derived from waste materials, it has been difficult to grasp 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 Ca derived from waste, etc. Therefore, the present invention aims to provide a resource circulation system for cement and concrete materials that can clarify whether the Ca used has been produced from already decarbonated Ca derived from waste, etc., 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 materials such as cement, mortar, and concrete, and by understanding the amount of non-energy-derived CO2 emissions in the movement of cement and concrete materials (from production to disposal), which can lead to a reduction in non-energy-derived CO2 emissions. [Means for solving the problem]

[0007] As a result of intensive research into solving the above problems, it was found that the above problems can be solved 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 materials, on a network in order to clearly determine whether the limestone used is produced from already decarbonated Ca 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 each forming a network and managing data on the production of cement and concrete-based materials, wherein at least one of the nodes calculates an amount of limestone-derived calcium made from limestone as a raw material among the calcium used in the production of the cement and concrete-based materials, generates calculated data on the amount of limestone-derived calcium, and records the calculated data on the amount of limestone-derived calcium in the network, at least one of the nodes calculates an amount of already decarbonated calcium derived from waste, etc., made from waste and by-products as raw materials among the calcium used in the production of the cement and concrete-based materials, generates calculated data on the amount of calcium derived from waste, etc., and records the calculated data on the amount of calcium derived from waste, etc. in the network, and at least one of the nodes links the limestone-derived calcium amount data and the waste, etc.-derived calcium amount data to cement and concrete-based material data assigned to the produced cement and concrete-based material, and records the linked cement and concrete-based material data in the network. [2] A resource circulation system for cement and concrete-based materials as 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], wherein at least one of the nodes identifies cement and concrete-based materials in which the proportion of limestone-derived calcium among the calcium used in the production is 98% or less. [4] A resource circulation system for cement-concrete-based materials described in any one of [1] to [3], wherein the cement-concrete-based material is at least one of cement, mortar, and concrete. [5] A resource circulation system for cement / concrete-based 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 results of analysis such as observation of particle shape by SEM, quantification of trace elements by XRF, and quantification of trace elements by ICP-OES. [6] A resource circulation system for cement and concrete materials described in any of [1] to [5], wherein the network is a blockchain network. [7] A resource circulation system for cement / concrete-based materials described in any of [1] to [6], wherein at least one of the nodes adds data on energy-derived CO2 emissions when using limestone-derived calcium made from limestone to the limestone-derived calcium amount data, and at least one of the nodes adds data on energy-derived CO2 emissions when using already decarbonated calcium derived from waste, etc., made from waste / by-products, to the waste-derived calcium amount data. Effect of the Invention

[0009] According to the present invention, 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, it is possible to clarify whether the Ca used has been produced from already decarbonated Ca 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 description of the drawings]

[0010] [Figure 1] FIG. 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 PREFERRED EMBODIMENTS

[0011] A resource circulation system 1 for cement-concrete-based materials according to an embodiment of the present invention (hereinafter may be simply referred to as "the present 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-concrete-based materials, as shown in Fig. 1. The cement-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 limestone-derived calcium amount data, waste-derived calcium amount data, and cement and concrete-based material data are processed and recorded in a distributed manner using encryption technology. The network 100 is an information and communication network such as the Internet, an intranet, a cloud network, and a blockchain network, and is preferably a blockchain network. By using an electronic signature and a hash pointer, the data having a data structure that makes it easy to detect tampering is held by a large number of distributed nodes, thereby realizing high availability and data integrity. As the blockchain network, it is preferable to adopt a consortium type blockchain, but other formats such as a public type 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 as to be able to communicate with each other. Each node includes 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 includes an input unit that inputs and stores data in the memory unit. The input unit may be a user interface of an information processing device, such as a mouse, a keyboard, a touch panel, or a voice input device.

[0014] At least one of the nodes 10 constituting the network 100 calculates the amount of Ca derived from limestone, which is made from limestone as a raw material, out of the calcium used in the production of cement-concrete materials. A method for calculating the amount of Ca derived from limestone, which is made from limestone 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 Ca using limestone as a raw material. The limestone-derived calcium amount data 12 is data on the amount of limestone-derived Ca used in cement / concrete-based materials that is used as a raw material for limestone. 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 waste, etc. that has already been decarbonated and is derived from waste, etc. that uses waste and by-products as raw materials, out of the calcium used in the production of cement / concrete-based materials. A method for calculating the amount of Ca derived from waste, etc. that has already been decarbonated and is derived from waste, etc. that uses 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 using 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 using 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, which is made from limestone as a raw material, and the amount of calcium derived from already decarbonated waste, etc., which is made from waste and by-products as raw materials. First, we present formula (1) for calculating the carbon dioxide fixation rate (mass%) due to the carbonation reaction of cement-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, formula (2) for calculating the amount of calcium carbonate (CaCO3) in cement-concrete materials derived from formula (1) is shown. CaCO3 amount = 1.785CaO-1.250SO3-2.274CO2+2.483MgO+3.229Na2O+2.126K2O…(2) The contents (mass%) of the chemical components CaO, SO3MgO, Na2O, and K2O in the target cement / concrete-based material, as well as the CO2 content (mass%) are calculated. The contents (mass%) of the chemical components in the cement / concrete-based material and the CO2 content (mass%) can be calculated by analysis. The CO2 content (mass%) can be calculated, for example, by total carbon analysis of the gas released when the target material is completely oxidized by overheating it, or by infrared analysis of CO2. The amount of calcium carbonate (CaCO3 amount) in the cement / concrete-based material is calculated by substituting the contents (mass%) of the chemical components in the target cement / concrete-based material and the CO2 content (mass%) into formula (2). The calculated amount of calcium carbonate (CaCO3 amount) corresponds to the amount of calcium carbonate derived from limestone and wastes and by-products that have already been decarbonated. 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 amount) in the cement-concrete material is calculated by subtracting the amount of calcium oxide (CaO amount) 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 amount) 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 made 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 (dehydrated cake) generated in ready-mixed concrete plants and concrete product plants, incineration ash (coal ash, wood 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, which has a lower impurity content than already decarbonated waste-derived calcium derived from wastes made from other wastes and by-products, is preferred. Examples of by-product slaked lime include acetylene by-product slaked lime such as by-product slaked lime (wet type and dry type depending on the acetylene gas production method) produced in the acetylene gas production process by the calcium carbide method, and by-product slaked lime contained in the dust captured in 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 ratios can be confirmed by fluorescent X-ray measurement and mass loss (Ca(OH)2: around 405°C to 515°C, CaCO3: around 650°C to 765°C) determined by differential thermogravimetry (TG-DTA). The volume average particle diameter measured by laser diffraction / scattering method is about 50 to 100 μm. Furthermore, the moisture content measured by the loss on drying method in JIS K 0068 "Method for measuring moisture content of chemical products" is preferably 10% or less. In addition, 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 the limestone-derived calcium amount data 12 and the 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, grasps 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 included in the node 40. Recording the tracing data in the storage unit 41 included in the node 40 constituting the network 100 is synonymous with recording the tracing data in the network 100. By recording the tracing data in the network 100, it is possible to grasp the movement of cement / concrete-based materials (from production to disposal) by accessing the network 100 and referring to the tracing data, and it is possible to grasp the movement of the amount of limestone-derived calcium and the amount of calcium derived from waste, etc. used in the cement / concrete-based material by the limestone-derived calcium amount data 12 and the waste, etc. derived calcium amount data 22 linked to the cement / concrete-based material data 32 of the cement / concrete-based 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 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, and creates ratio calculation data (not shown).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 it is a good 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 constituting the network 100 is synonymous with recording the ratio calculation data in the network 100. By using cement / 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-derived 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% and may be, for example, 96% or 94%, which is a sufficient reduction in CO2 emissions.

[0021] At least one node 60 constituting the network 100 creates 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 create the raw material identification data by referring to 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, the 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 identifying whether calcium used in the production of cement and concrete-based materials is limestone-derived calcium or waste-derived calcium include, in addition to referring to cement and concrete-based material data32, observation of particle shape by SEM, quantification of trace elements by XRF, and analysis results of quantification of trace elements by ICP-OES. It is preferable to comprehensively determine the identification of calcium used in the production of cement and concrete-based materials based on the results of observation of particle shape by SEM, quantification of trace elements by XRF, and analysis results of quantification of trace elements by ICP-OES.

[0022] According to the resource circulation system 1 for cement / concrete-based materials of this embodiment, the limestone-derived calcium amount data 12 and the waste, etc.-derived calcium amount data 22 are linked to the cement / concrete-based material data 32 assigned to the produced cement / concrete-based material. Therefore, by referring to the cement / concrete-based material data 32, it is possible to clarify whether the limestone used as a raw material has been produced based on already decarbonated Ca derived from waste, etc., and the amount of waste, etc.-derived calcium used as a raw material. Furthermore, according to the resource circulation system 1 for cement / 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 / concrete materials, are managed, and by ensuring that the majority of the limestone used as a raw material is produced from already decarbonated Ca derived from waste, etc., it becomes possible to reduce non-energy origin 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 / concrete-based materials according to this embodiment may further include a node and a storage unit (not shown) for handling ownership data regarding the ownership of the cement / concrete-based materials and resources used to produce the cement / concrete-based materials. The ownership data is data indicating the origin and location of the cement / concrete-based materials and resources, etc., and is data for managing the origin and location of the cement / concrete-based materials and resources, etc. The ownership data is recorded in the network 100 so that it moves with the movement of the cement / concrete-based materials and resources, etc., thereby making it possible to manage the current location, as well as the origin and past locations of the cement / concrete-based materials and resources, etc. By managing the ownership data, it becomes possible to grasp the movement of the amount of limestone-derived calcium used in the cement / concrete-based 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 origin CO2 emissions and has not specifically mentioned energy origin CO2 emissions, but resource circulation system 1 for cement and concrete-based materials can be a system that includes data on energy origin CO2 emissions. If resource circulation system 1 for cement and concrete-based materials is a system that includes data on energy origin CO2 emissions, it can help understand the total amount of CO2 emissions, which is the sum of non-energy origin CO2 emissions and energy origin CO2 emissions, and contribute to reducing the total amount of CO2 emissions.

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

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

[0027] According to the resource circulation system 1 for cement and concrete based materials of another embodiment, data on the amount of energy-derived CO2 emissions 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 energy-derived CO2 emissions when using already decarbonated waste-derived Ca made from waste and by-products as raw materials is added to the waste etc.-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 CO2 emissions including the amount of energy-derived CO2 emissions. [Industrial Applicability]

[0028] This invention relates to resource circulation in the cement industry. By managing data on the amount of limestone-derived calcium in circulating cement and concrete material resources and data on the amount of already decarbonated calcium derived from waste, etc. via a network, it becomes 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 amount of CO2 emissions, which is the sum of non-energy origin CO2 emissions and energy origin CO2 emissions, in resource circulation in the cement sector, and to reducing the total amount of 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 Data on calcium content from waste, etc. 32 Cement and concrete material data 100 Network

Claims

1. A resource circulation system for cement / concrete-based materials, comprising nodes each forming a network and managing data related to the production of cement / concrete-based materials, At least one of the nodes calculates an amount of limestone-derived calcium derived from limestone as a raw material among calcium used in the production of cement / concrete-based materials, generates the calculated limestone-derived calcium amount data, and records the limestone-derived calcium amount data in the network; At least one of the nodes calculates the amount of calcium that has already been decarbonated and is derived from waste materials or by-products, among the calcium used in the production of cement / concrete-based materials, generates data on the amount of calcium derived from the waste materials or by-products, and records the data on the amount of calcium derived from the waste materials or by-products in the network; a resource circulation system for cement-concrete-based materials, wherein at least one of the nodes links the limestone-derived calcium amount data and the waste or other-derived calcium amount data to cement-concrete-based material data assigned to a produced cement-concrete-based material, and records the linked cement-concrete-based material data in the network.

2. The resource circulation system for cement / concrete-based materials according to claim 1 , wherein at least one of the nodes keeps track of the movement of the produced cement / concrete-based materials and records tracking data in the network.

3. 2. The resource circulation system for cement / concrete-based materials according to claim 1, wherein at least one of the nodes identifies a cement / concrete-based material in which the ratio of calcium derived from limestone to the calcium used in the production is 98% or less.

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. 2. The resource circulation system for cement / concrete-based materials according to claim 1, wherein the limestone-derived calcium and the waste-derived calcium are identified by a method of comprehensively judging from the results of analysis of particle shape observation by SEM, quantitative analysis of trace elements by XRF, and quantitative analysis of trace elements by ICP-OES.

6. The resource circulation system for cement / concrete-based materials according to claim 1 , wherein the network is a blockchain network.

7. At least one of the nodes uses limestone-derived calcium derived from limestone. ２ Adding data on discharge to the limestone-derived calcium amount data; At least one of the nodes uses already decarbonated calcium derived from waste materials and by-products, etc. ２ 2. The resource circulation system for cement / concrete-based materials according to claim 1, wherein data on discharge amount is added to the data on the amount of calcium derived from the waste, etc.

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