Concrete manufacturing method and combined use ratio designation device

Abstract

To enable even blast-furnace cement Class C with limited uses to be used in a wide range of applications.SOLUTION: In the concrete manufacturing method according to the present invention, when concrete is manufactured by mixing cement, water, and aggregate, Portland cement or blast-furnace cement type B and blast-furnace cement type C are used in combination as the cement to manufacture concrete equivalent to blast-furnace cement type A or blast-furnace cement type B. Correspondence data is created in advance that associates the combined proportion of Portland cement or blast-furnace cement type B and blast-furnace cement type C with slag content information that indicates the mass proportion of blast-furnace slag in the concrete manufactured with the combined proportion. Portland cement or blast-furnace cement type B and blast-furnace cement type C are used in combination according to the combined proportion in the correspondence data.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a technology for producing concrete using type C blast-furnace slag cement. [Background technology]

[0002] One of the types of cement specified in the Japanese Industrial Standards (JIS) is blast furnace cement, a blended cement in which blast furnace slag is premixed with Portland cement.

[0003] Portland cement is the most common type of cement. It is made by adding gypsum to a mixture of limestone, clay, etc., which is then baked to create a powder.

[0004] Blast-furnace cement is classified into Type A, Type B, and Type C according to the amount of blast-furnace slag mixed in. In Type A blast-furnace cement, the amount of blast-furnace slag (mass percentage: mass %) is more than 5% and less than 30%. In Type B blast-furnace cement, the amount of blast-furnace slag is more than 30% and less than 60%. In Type C blast-furnace cement, the amount of blast-furnace slag is more than 60% and less than 70%.

[0005] Of these types of blast-furnace cement, the blast-furnace cement currently in general circulation is almost entirely type B. Currently, the production volume of type A blast-furnace cement is almost zero. In recent years, a small amount of type C blast-furnace cement has been produced as a special cement, but it is not currently in general circulation. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6812310 Summary of the Invention [Problem to be solved by the invention]

[0007] In the production of Portland cement, a large amount of carbon dioxide is generated during the process of burning a mixture of limestone, clay, etc. The more blast furnace slag contained in the cement, the less carbon dioxide is generated during the burning process. Since blast furnace cement type C contains a large amount of blast furnace slag, it generates less carbon dioxide during cement production.

[0008] However, because Type C blast-furnace slag contains a high amount of 60-70% of the cement, there are concerns about delayed strength development and reduced durability. Therefore, although Type C blast-furnace slag is very rarely used for above-ground structures, its applications are almost exclusively limited to underground structures.

[0009] As mentioned above, type C blast-furnace slag cement is not currently widely available, and its use is almost exclusively limited to underground structures. However, there is a demand for it to be made available for a wide range of use in concrete products.

[0010] Therefore, an object of the present invention is to make it possible to widely utilize blast-furnace slag cement type C, which has such limited uses. [Means for solving the problem]

[0011] In order to achieve the above-mentioned object, in the concrete manufacturing method of the present invention, when concrete is produced by mixing cement, water and aggregate, Portland cement or blast-furnace cement type B and blast-furnace cement type C are used in combination as the cement, thereby producing concrete equivalent to blast-furnace cement type A or blast-furnace cement type B. Effect of the Invention

[0012] According to the present invention, concrete is produced by using Portland cement or blast furnace cement type B in combination with blast furnace cement type C. Blast furnace cement type C contains a large amount of blast furnace slag. On the other hand, Portland cement or blast furnace cement type B contains a small amount of blast furnace slag. Therefore, even if the use of blast furnace cement type C is limited due to the large amount of blast furnace slag, the amount of blast furnace slag in the concrete produced can be adjusted within a wide range by using the blast furnace cement type C in combination with Portland cement or blast furnace cement type B containing a small amount of blast furnace slag. For example, the amount of blast furnace slag in the concrete can be adjusted within a wide range depending on the required performance, quality, or use of the concrete. Therefore, even blast furnace cement type C can be widely used. [Brief description of the drawings]

[0013] [Figure 1] 4 shows an example of a configuration of correspondence data according to the first embodiment of the present invention. [Diagram 2] 6 shows an example of another configuration of correspondence data according to the first embodiment of the present invention. [Diagram 3] 1 is a block diagram showing an example of the configuration of a combination ratio designation device according to a first embodiment of the present invention. [Figure 4] 1 is a flowchart showing a method for producing concrete according to a first embodiment of the present invention. [Diagram 5] 13 shows an example of a configuration of correspondence data according to the second embodiment of the present invention. [Figure 6] 13 shows an example of another configuration of correspondence data according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals are used to designate the same parts, and duplicated explanations will be omitted.

[0015] [First embodiment] A first embodiment of the present invention will be described below. In the concrete manufacturing method according to the first embodiment, concrete equivalent to blast-furnace slag cement type A or blast-furnace slag cement type B is manufactured using blast-furnace slag cement type C.

[0016] For this reason, in the concrete manufacturing method according to the first embodiment, when concrete is manufactured by mixing cement, water, aggregate, and admixture, Portland cement and blast-furnace slag cement type C are used in combination as the cement. In this way, concrete equivalent to blast-furnace slag cement type A or blast-furnace slag cement type B is manufactured. The concrete may be ready-mixed concrete (same below).

[0017] In the following, concrete equivalent to blast-furnace cement Type A will be simply referred to as concrete equivalent to Type A (or concrete equivalent to Type A), and concrete equivalent to blast-furnace cement Type B will be simply referred to as concrete equivalent to Type B (or concrete equivalent to Type B).

[0018] In Type A equivalent concrete, the mass ratio of blast furnace slag to the combined Portland cement and Type C blast furnace cement (excluding water, aggregates, and admixtures) is more than 5% and not more than 30%, or the representative value of the slag content range described below is more than 5% and not more than 30%.

[0019] In Type B equivalent concrete, the mass ratio of blast furnace slag to the combined Portland cement and Type C blast furnace cement (excluding water, aggregates, and admixtures) is more than 30% and not more than 60%, or the representative value of the slag content range described below is more than 30% and not more than 60%.

[0020] In the present application, the mass ratio of blast furnace slag in cement (i.e., Portland cement, blast furnace cement type A, blast furnace cement type B, or blast furnace cement type C) refers to the mass ratio of blast furnace slag contained in the cement relative to the total mass of the cement (hereinafter also simply referred to as the blast furnace slag mass ratio). The mass ratio of blast furnace slag in the above-mentioned concrete equivalent to A or concrete equivalent to B is, in more detail, the mass ratio of blast furnace slag contained in the concrete equivalent to A or concrete equivalent to B relative to the total mass (excluding water, aggregate, and admixture) of the Portland cement and blast furnace cement type C used in the concrete equivalent to A or concrete equivalent to B (hereinafter also simply referred to as the blast furnace slag mass ratio). In addition, in the present application, when a and b are numerical values ​​and the content "the mass ratio is a% to b%" is described, the range indicated by "a% to b%" may or may not include a%, and may or may not include b%.

[0021] In this embodiment, the Portland cement is a cement made by adding gypsum to a calcined mixture of limestone, clay, etc., to form a powder. In this embodiment, the Portland cement may be, for example, ordinary Portland cement, but may also be other types of Portland cement.

[0022] The aggregate may be either or both of fine aggregate and coarse aggregate. The admixture may be, for example, a chemical admixture, but is not limited thereto. The admixture is used as needed, and does not have to be used in the production of Class A equivalent concrete or Class B equivalent concrete.

[0023] In the present embodiment, the blast furnace cement is a cement obtained by mixing blast furnace slag with Portland cement. The blast furnace slag may be ground granulated blast furnace slag obtained by pulverizing molten slag that is rapidly cooled and generated as a by-product from a blast furnace (blast furnace) in a steelworks. In the present application, the blast furnace cement type A, the blast furnace cement type B, and the blast furnace cement type C may be those specified in the Japanese Industrial Standard JISR5211 as follows (1) to (3). (1) The mass percentage (mass%) of blast furnace slag in Type A blast furnace cement is more than 5% and not more than 30%. (2) The mass proportion of blast furnace slag in Type B blast furnace cement is more than 30% and not more than 60%. (3) The mass proportion of blast furnace slag in blast furnace cement type C is more than 60% and not more than 70%.

[0024] (Corresponding data) Corresponding data is prepared in advance for the combined use of Portland cement and blast-furnace slag cement type C. This corresponding data is prepared under the following assumptions.

[0025] <Premise> The mass proportion of blast furnace slag in the Portland cement used is known to be within a first range, but the value within that first range is not specified, and the mass proportion of blast furnace slag in the blast furnace cement Type C used is known to be within a second range, but the value within that second range is not specified.

[0026] Examples of such assumptions include the following: The portland cement is distributed with a label or public announcement that the mass percentage of blast furnace slag is within a first range (e.g., a range of 0% to 5%), but the value within this first range that the mass percentage is is not specified. Similarly, the blast furnace cement type C is sold or distributed with a label or public announcement that the mass percentage of blast furnace slag is within a second range (e.g., a range of more than 60% to 70%), but the value within this second range that the mass percentage is is not specified.

[0027] Fig. 1 shows an example of the configuration of the correspondence data. The correspondence data is data that associates the proportion of Portland cement and blast-furnace cement type C used in the manufacturing method of this embodiment with slag content information that indicates the mass proportion of blast-furnace slag in concrete equivalent to type A or type B manufactured with the proportion of the Portland cement and blast-furnace cement type C used in the manufacturing method of this embodiment. The correspondence data may be data represented in a table as shown in Fig. 1.

[0028] The correspondence data includes type information, combination use ratio information including the combination use ratio described above, and the above-mentioned slag quantity information, which are all associated with each other.

[0029] The type information includes identification information for each of the Portland cement and blast-furnace cement type C used in combination (in Figure 1, the notations "Portland cement" and "blast-furnace cement type C" in the "type information" column), and identification information indicating whether the concrete to be produced is concrete equivalent to blast-furnace cement type A or blast-furnace cement type B (in Figure 1, the notations "blast-furnace cement type A equivalent" and "blast-furnace cement type B equivalent" in the "type information" column).

[0030] The combination ratio information indicates the combination ratio corresponding to each identification information of the type information. Each combination ratio corresponding to the identification information indicating concrete equivalent to blast-furnace cement type A indicates the mass ratio of Portland cement and blast-furnace cement type C used in combination. Also, each combination ratio corresponding to the identification information indicating concrete equivalent to blast-furnace cement type B indicates the mass ratio of Portland cement and blast-furnace cement type C used in combination.

[0031] As shown in Fig. 1, the combination ratio corresponding to the identification information indicating Portland cement may indicate 100:0. Similarly, the combination ratio corresponding to the identification information of type information indicating blast-furnace cement type C may indicate 0:100.

[0032] The slag content information indicates the mass percentage of blast furnace slag in concrete equivalent to Class A or Class B produced with the corresponding combination ratio. More specifically, as shown in FIG. 1, the slag content information corresponding to the identification information indicating concrete equivalent to Class A blast furnace cement indicates the mass percentage of blast furnace slag in the concrete equivalent to Class A produced with the corresponding combination ratio for each corresponding combination ratio. Also, as shown in FIG. 1, the slag content information corresponding to the identification information indicating concrete equivalent to Class B blast furnace cement indicates the mass percentage of blast furnace slag in the concrete equivalent to Class B produced with the corresponding combination ratio for each corresponding combination ratio.

[0033] As shown in FIG. 1, the slag content information corresponding to the identification information indicating Portland cement may represent the range of the mass proportion of blast furnace slag in Portland cement produced at the corresponding combination ratio (100:0) (in FIG. 1, "0 to 5%). This range is the first range under the above-mentioned premise. Furthermore, the slag content information corresponding to the identification information indicating blast furnace cement Type C may represent the range of the mass proportion of blast furnace slag in blast furnace cement Type C produced at the corresponding combination ratio (0:100) (in FIG. 1, "60 to 70%). This range is the second range under the above-mentioned premise.

[0034] According to this embodiment, in the correspondence data, for identification information indicating concrete equivalent to blast-furnace cement type A or blast-furnace cement type B, a combination ratio and slag content information that correspond to each other are set as one set. The correspondence data includes a plurality of sets of combination ratios and slag content information. In each set, the slag content information is determined according to the combination ratio of the set and the above-mentioned first and second ranges.

[0035] The slag content information for each of these groups includes a slag content range, which is the range of possible mass fractions of blast-furnace slag in concrete equivalent to blast-furnace cement Type A or blast-furnace cement Type B produced with the combined ratio of that group, and a representative value for that slag content range, as shown in Figure 1.

[0036] As shown in Figure 1, in the correspondence data, among the multiple sets of slag content ranges, the slag content ranges of at least some of the adjacent pairs (e.g., one adjacent pair, or each of multiple or all adjacent pairs) are not contiguous, and there may be a numerical range between the two ranges that does not belong to either of the two ranges.

[0037] The representative values ​​of each of the above-mentioned multiple sets may be set at equal intervals as shown in FIG. 1. In this case, in at least some of the multiple sets, the representative value is an intermediate value shifted from the center of the slag content range, and the intermediate value is closer to the center than either the upper or lower limit of the slag content range. This shift may be less than 1 / 2 the interval between the representative values. The equally spaced representative values ​​may be spaced at intervals of 5% and a multiple of 5, or may be spaced at intervals of 10% and a multiple of 10 as shown in FIG. 1.

[0038] (Other configurations of corresponding data) Fig. 2 shows an example of another configuration of the correspondence data. The other configuration of the correspondence data will be described with reference to Fig. 2. In the other configuration, the points that are not described below may be the same as the above-mentioned correspondence data.

[0039] As shown in FIG. 2, among the multiple sets of slag amount ranges, at least some of the adjacent pairs (e.g., one adjacent pair, or each of multiple or all adjacent pairs) may partially overlap with each other. That is, the multiple slag amount ranges of each of the multiple sets described above may have portions that partially overlap with each other. There may be one or more such overlapping portions.

[0040] (Combination ratio designation device) 3 is a block diagram showing a combination ratio designation device 10 according to a first embodiment of the present invention. The combination ratio designation device 10 includes a storage device 11, an output device 12, and an operation device 13.

[0041] The above-mentioned corresponding data is stored in the storage device 11. The storage device 11 may be, for example, a hard disk drive (HDD), a solid state disk (SSD), or a non-volatile memory, but is not limited to these.

[0042] The output device 12 outputs the corresponding data stored in the storage device 11 in a form that can be visually recognized by humans. The output of the corresponding data by the output device 12 may be a display on a screen of a display device. In this case, the output device 12 has a display device that displays the corresponding data on its screen. For example, the corresponding data of FIG. 1 or FIG. 2 may be data displayed on the screen of the display device.

[0043] Alternatively, the output of the corresponding data by the output device 12 may be a transmission to a terminal (e.g., a mobile terminal such as a smartphone). In this case, the output device 12 has a transmission unit that transmits the corresponding data to the terminal using wireless communication or wired communication. As a result, the terminal receives the corresponding data and displays the received corresponding data (e.g., the data in FIG. 1 or FIG. 2) on its screen. Alternatively, the output of the corresponding data by the output device 12 may be a printing on paper. In this case, the output device 12 has a printer that prints the corresponding data (e.g., the data in FIG. 1 or FIG. 2) on paper.

[0044] The operation device 13 is configured to be capable of performing an operation of designating a combination ratio of any of the multiple pairs in the corresponding data. When the corresponding data is displayed on the screen of the display device or the terminal in the configuration as shown in Fig. 1 or 2, the operation device 13 can be an operation of designating a combination ratio by clicking or touching with a finger a field of the combination ratio of any of the multiple pairs displayed on the screen, and can be a device (e.g., a device including a mouse or a touch panel) capable of performing an operation of inputting (e.g., transmitting) the designated combination ratio to the control unit 21 of the concrete manufacturing apparatus 20.

[0045] Alternatively, the operation device 13 may be a device provided on the above-mentioned terminal or another terminal, and may be a device (such as a keyboard or touch panel) that can specify the combination ratio by inputting the combination ratio of any one of multiple pairs, and can input the specified combination ratio into the control unit 21 of the concrete manufacturing equipment 20.

[0046] In addition, the operation device 13 may be configured to enable an operation to input and specify, in addition to the combination ratio, mass information (i.e., numerical information) indicating one or both of the Portland cement and blast-furnace cement type C to be used in combination, or the total mass of the Portland cement and blast-furnace cement type C, and input the mass information to the control unit 21.

[0047] The control unit 21 controls the weighing device 22 according to the combined use ratio and mass information input from the operation device 13. As a result, the weighing device 22 measures out the Portland cement and blast-furnace cement type C to be used in combination according to the combined use ratio and mass information, and supplies the measured Portland cement and blast-furnace cement type C to the mixer 23.

[0048] The metering device 22 may supply Portland cement and blast furnace cement type C from a storage bottle storing Portland cement and a storage bottle storing blast furnace cement type C to separate or the same measuring device, measure the Portland cement and blast furnace cement type C in the measuring device by the mass according to the above-mentioned combination ratio and mass information, and supply the measured Portland cement and blast furnace cement type C from the measuring device to the mixer 23. Such a measuring device 22 may be, for example, a measuring device described in JP 2023-056795 or JP 2022-181463 A, or may be another known measuring device, so detailed description thereof will be omitted.

[0049] The mixer 23 mixes the Portland cement and blast-furnace cement type C supplied from the metering device 22 as described above with aggregates (e.g., coarse aggregate and fine aggregate), admixtures (e.g., chemical admixtures), and water supplied from other metering devices. As a result, concrete equivalent to type A or type B is produced by mixing these. Note that admixtures do not necessarily have to be used.

[0050] (Concrete manufacturing method) Fig. 4 is a flow chart showing a method for producing the above concrete according to the first embodiment. According to this method, concrete equivalent to blast-furnace cement type A or blast-furnace cement type B is produced by using Portland cement and blast-furnace cement type C in combination. This method has steps S1 to S6 as follows.

[0051] The Portland cement and the blast-furnace cement type C used in combination may be produced by a cement manufacturer in steps S1 and S2, respectively, as follows.

[0052] In step S1, a cement manufacturer crushes and mixes a plurality of raw materials (mainly limestone, clay, etc.), burns the mixture at a high temperature of, for example, about 1500°C to produce clinker, crushes the clinker, and further crushes a mixture of gypsum or gypsum and a small amount of a mixed component to produce Portland cement. Here, the small amount of a mixed component may be blast furnace slag, fly ash, or a siliceous admixture.

[0053] In step S2, the cement manufacturer produces blast-furnace cement type C. That is, the cement manufacturer prepares Portland cement and blast-furnace slag, adds the blast-furnace slag to the Portland cement, and mixes them in a mixer to produce blast-furnace cement type C. The cement manufacturer in step S2 may be the same as the cement manufacturer in step S1, or may be different from the cement manufacturer in step S1.

[0054] In step S3, separately from the above-mentioned steps S1 and S2, the above-mentioned correspondence data is created in advance for the Portland cement and the blast-furnace cement type C produced in steps S1 and S2, respectively. The created correspondence data may be stored in the above-mentioned storage device 11.

[0055] In step S3, in this embodiment, the combination ratio of each pair of corresponding data is set after checking the properties of fresh concrete and the strength of concrete through test mixing, as follows. For the combination ratio of each pair of corresponding data, ready-mixed concrete using Portland cement and blast-furnace cement type C in accordance with the combination ratio is produced in advance by test mixing using a small simulation mixer or the like, and the properties (e.g., slump and air content) and strength (e.g., compressive strength) of the produced fresh concrete are measured. After confirming that the measured properties and strength meet the required conditions, the combination ratio pair is set as the corresponding data.

[0056] In step S4, the proportion of Portland cement and blast-furnace cement type C to be used together is designated according to the corresponding data. This designation may be made by a person. For example, the combined use data may be displayed on the screen of the display device or the terminal or printed on paper as described above, and a person may look at the displayed or printed corresponding data and select and designate one of the multiple combinations in the corresponding data. This designation may be made by a person operating the operation device 13 as described above.

[0057] In addition, in step S4, a person may operate the operating device 13 as described above to specify mass information (i.e., numerical information) indicating one or both of the Portland cement and blast-furnace cement type C to be used in combination, or the total mass of the Portland cement and blast-furnace cement type C.

[0058] In step S5, the combination ratio and mass information designated in step S4 are input to the control unit 21 of the concrete manufacturing equipment 20. This input may be performed by a person operating the operation device 13 as described above.

[0059] In step S6, the control unit 21 controls the concrete manufacturing equipment 20 according to the combination ratio and mass information input in step S5. As a result, the concrete manufacturing equipment 20 manufactures concrete using Portland cement and blast-furnace cement type C in combination according to the combination ratio and mass information input in step S5. Step S6 has steps S61 and S62.

[0060] In step S61, the control unit 21 controls the weighing device 22 according to the input combination ratio and mass information. As a result, the weighing device 22 measures out the Portland cement and blast-furnace cement type C to be used in combination according to the combination ratio and mass information, and supplies the Portland cement and blast-furnace cement type C measured in the combination ratio to the mixer 23. Note that in step S61, the control unit 21 further controls other weighing devices to measure out aggregate, water, and admixtures (e.g., chemical admixtures) according to their respective designated masses and supply them to the mixer 23.

[0061] The Portland cement and blast-furnace cement type C measured in step S61 may be obtained (e.g., purchased) by a concrete manufacturer from the cement manufacturer as the Portland cement and blast-furnace cement type C produced in steps S1 and S2, respectively. Steps S4 to S6 may be performed by the cement manufacturer.

[0062] In step S62, for example, the control unit 21 operates the mixer 23, which then kneads the Portland cement and blast-furnace cement type C supplied from the metering device 22 in step S61 with the aggregate, water, and admixtures (e.g., chemical admixtures) supplied from the other metering devices. This produces concrete equivalent to type A or type B. Note that no admixtures may be used. The concrete equivalent to type A or type B has a blast-furnace slag mass ratio within the slag content range corresponding to the combination ratio specified in step S4 in the corresponding data.

[0063] (Effects of the first embodiment) According to the first embodiment of the present invention, the following effects (A) to (E) are obtained.

[0064] (A) Even though Type C blast-furnace slag cement has limited uses due to its high content of blast-furnace slag, the amount of blast-furnace slag in the concrete produced can be adjusted within a very wide range by combining Type C blast-furnace slag cement with Portland cement, which has a significantly lower or no blast-furnace slag content than Type C blast-furnace slag cement.

[0065] (B) The mass ratio of blast furnace slag in Portland cement is known to be in a first range, but the value within the first range is not specified, and the mass ratio of blast furnace slag in blast furnace cement type C is known to be in a second range, but the value within the second range is not specified. In this case, correspondence data is created in advance that associates the combined ratio of Portland cement and blast furnace cement type C with slag content information representing the mass ratio of blast furnace slag in concrete manufactured with that combined ratio. Therefore, the combined ratio for manufacturing concrete with the mass ratio of blast furnace slag represented by the slag content information can be immediately understood from the correspondence data.

[0066] (C) The corresponding data includes the combination ratios of the multiple sets and the slag content information. Therefore, by referring to the corresponding data, a person can select slag content information corresponding to the desired performance, quality, or use of concrete from each of the multiple sets of slag content information, and immediately grasp and specify the combination ratios of the selected set of slag content information as the combination ratios corresponding to the performance, etc. of concrete.

[0067] (D) The slag content information for each group includes a representative value of the range of slag content, which is the range of possible blast furnace slag mass ratios in concrete produced with the combination ratios of the group. Therefore, for example, by selecting a representative value that is closest to the blast furnace slag mass ratio corresponding to the performance, quality, or use of the concrete, the combination ratio of the selected representative value can be immediately understood and specified as the combination ratio corresponding to the performance, etc. of the concrete. In this way, by setting a representative value, it becomes easy to understand the combination ratios.

[0068] (D1) For example, as in the example of FIG. 1, the slag content ranges of at least some pairs adjacent to each other (for example, one pair adjacent to each other, or each of multiple or all pairs adjacent to each other) of the multiple sets of slag content ranges are not continuous, and a numerical range that does not belong to either of the two ranges may exist between the two ranges. In this case, it may be difficult to grasp which slag content range in the corresponding data is most suitable for the concrete performance, etc., because the concrete performance, etc. required is the blast furnace slag mass ratio of the numerical range. Therefore, as described above, a representative value of each of these slag content ranges is set. By using these representative values ​​as a guide, the representative value closest to the blast furnace slag mass ratio according to the concrete performance, etc. can be selected, and the combination ratio of the selected representative value pair can be immediately grasped and specified as the combination ratio corresponding to the concrete performance, etc. At this time, if necessary, the slag content range of the selected representative value pair can also be confirmed.

[0069] (D2) In addition, for example, as in the example of FIG. 2, when the multiple slag content ranges of the multiple sets partially overlap each other, it may be difficult to determine which slag content range is most suitable for the performance of the concrete. Therefore, as described above, a representative value for each of these slag content ranges is set. By using these representative values ​​as a guide, the representative value closest to the blast furnace slag mass ratio corresponding to the performance of the concrete can be selected, and the combination ratio of the selected representative value set can be immediately determined and specified as the combination ratio corresponding to the performance of the concrete.

[0070] (E) In at least some of the multiple sets, the representative values ​​may be set to intermediate values ​​shifted from the center of the slag amount range, so that the multiple representative values ​​are set at equal intervals. In other words, even if the centers of the multiple slag amount ranges are not evenly spaced, the representative values ​​of the slag amount ranges are set at equal intervals by shifting the representative values ​​from the center of the slag amount range, so that the multiple sets of corresponding data can be easily compared using the evenly spaced representative values ​​as a guide.

[0071] [Second embodiment] A second embodiment of the present invention will be described. In the method for producing concrete according to the second embodiment, when concrete is produced by mixing cement, water, aggregate, and admixture, blast-furnace cement type B and blast-furnace cement type C are used in combination as cement. This produces concrete equivalent to blast-furnace cement type B. That is, in the second embodiment, blast-furnace cement type B is used instead of the above-mentioned Portland cement.

[0072] Matters not described below regarding the second embodiment may be the same as those in the first embodiment described above. For example, the concrete manufacturing method, the combination ratio designation device 10, etc. in the second embodiment may be the same as the concrete manufacturing method, the combination ratio designation device 10, etc. in the first embodiment described above. That is, in the description of the first embodiment described above, "Portland cement" is replaced with "blast furnace cement type B", and the manufactured concrete is replaced from "concrete equivalent to type A or type B" to "concrete equivalent to type B", resulting in the content of the second embodiment.

[0073] (Corresponding data) Fig. 5 shows an example of the configuration of the correspondence data in the second embodiment. In the correspondence data, the number of pairs of the combined use ratio and the slag amount information is two in the example of Fig. 5, but may be three or more.

[0074] As shown in Fig. 5, the slag content information corresponding to the identification information indicating the blast-furnace cement type B in the type information may represent the range of the mass proportion of the blast-furnace slag in the blast-furnace cement type B produced at the corresponding combination ratio (100:0) (in Fig. 5, "40 to 45") This range corresponds to the first range described above.

[0075] As shown in Figure 5, in the correspondence data, among the multiple sets of slag quantity ranges, the slag quantity ranges of at least some of the adjacent pairs (e.g., one adjacent pair, or each of multiple or all adjacent pairs) are not contiguous, and there may be a numerical range between the two ranges that does not belong to either of the two ranges.

[0076] (Other configurations of corresponding data) 6 shows an example of another configuration of the correspondence data. In the other configuration, the points that are not described below may be the same as the correspondence data described above.

[0077] As shown in Fig. 6, the slag amount ranges of at least some of the adjacent pairs (e.g., one adjacent pair, or some or all adjacent pairs) may partially overlap each other. That is, the slag amount ranges of each of the above-mentioned multiple sets may have a partially overlapping portion.

[0078] (Effects of the second embodiment) The second embodiment also provides the same effect as effect (A) of the first embodiment. That is, in the second embodiment, even if the use of type C blast-furnace cement is limited due to the large amount of blast-furnace slag, as in effect (A) of the first embodiment, the amount of blast-furnace slag in the concrete to be produced can be adjusted within a wide range by using the type C blast-furnace cement in combination with type B blast-furnace cement, which has a smaller amount of blast-furnace slag than the type C blast-furnace cement.

[0079] In the first embodiment, the portland cement used in combination with type C blast-furnace cement contains a significantly smaller amount of blast-furnace slag than type B blast-furnace cement, so the amount of blast-furnace slag in the concrete produced in the first embodiment can be adjusted within a much wider range than in the second embodiment.

[0080] Moreover, according to the second embodiment, the same effects as the effects (B) to (E) of the first embodiment can be obtained.

[0081] The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical concept of the present invention. [Explanation of symbols]

[0082] 10. Combination ratio designation device 11 Storage device 12 Output Devices 13 Operating device 20 Concrete manufacturing equipment 21 Control section 22 Weighing device 23 Mixer

Claims

1. When making concrete by mixing cement, water and aggregate, A method for producing concrete, comprising using Portland cement or blast-furnace cement type B in combination with blast-furnace cement type C as the cement to produce concrete equivalent to blast-furnace cement type A or blast-furnace cement type B.

2. The mass proportion of blast furnace slag in the Portland cement or the blast furnace cement type B is known to be within a first range, but the value within the first range is not specified; the mass proportion of blast furnace slag in the blast furnace cement type C is known to be within a second range, but the value within the second range is not specified; Corresponding data is created in advance that associates the combined ratio of the Portland cement or the blast-furnace cement type B and the blast-furnace cement type C with slag content information that represents the mass ratio of blast-furnace slag in the concrete produced with the combined ratio; 2. The method for producing concrete according to claim 1, wherein the portland cement or the blast-furnace cement type B and the blast-furnace cement type C are used in combination in accordance with the combination ratio of the corresponding data.

3. The corresponding combination ratio and the slag amount information are regarded as one set, and the corresponding data includes a plurality of sets of the combination ratio and the slag amount information, 3. The method for producing concrete as described in claim 2, wherein the portland cement or the blast-furnace cement type B and the blast-furnace cement type C are used in combination in accordance with the combination ratio of any one of the multiple pairs to produce concrete equivalent to the blast-furnace cement type A or type B, in which the mass ratio of blast-furnace slag is a mass ratio in accordance with the slag content information of the pair.

4. storing the corresponding data in a storage device; The corresponding data in the storage device is output by an output device in a visually recognizable form, and a person operates an operation device to specify the combination ratio of any one of the plurality of pairs in the corresponding data and input it to a concrete manufacturing apparatus; The method for producing concrete according to claim 3 , wherein the concrete producing apparatus produces the concrete using Portland cement or a combination of blast-furnace cement type B and blast-furnace cement type C in accordance with the input combination ratio.

5. The concrete is a concrete using the Portland cement and blast furnace cement type C in combination, 5. The method for producing concrete according to claim 4, wherein the correspondence data includes type information indicating, for each of the groups, whether the concrete produced with the combination ratio of the group is a concrete equivalent to blast-furnace cement type A or a concrete equivalent to blast-furnace cement type B.

6. 5. The method for producing concrete according to claim 4, wherein the slag content information for each of the groups includes a slag content range, which is a possible range of the mass proportion of blast furnace slag in the concrete produced with the combination ratio of that group, and a representative value of that slag content range.

7. The method for producing concrete according to claim 6, wherein at least some pairs of adjacent slag content ranges among the plurality of sets of slag content ranges are not continuous with each other, and a numerical range that does not belong to either of the two ranges exists between the two ranges.

8. The method for producing concrete according to claim 6 , wherein among the plurality of sets of slag content ranges, at least some pairs of adjacent slag content ranges partially overlap each other.

9. the representative values ​​in each of the plurality of sets are set at equal intervals; 7. The method for producing concrete according to claim 6, wherein in at least some of the plurality of sets, the representative value is an intermediate value shifted from the center of the slag content range, and the intermediate value is a value closer to the center than either the upper limit value or the lower limit value of the slag content range.

10. A combination ratio designation device used in the concrete manufacturing method according to any one of claims 4 to 9, the storage device storing the corresponding data; an output device that outputs the corresponding data in the storage device in a visually recognizable form; and an operation device capable of specifying the combination ratio of any one of the plurality of pairs in the correspondence data and inputting the specified combination ratio into the concrete manufacturing apparatus.

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