Adjustment method for expansive additive blending amount into ready mixed concrete, manufacturing method for ready mixed concrete, expansive additive blending amount adjustment system, and program

Abstract

To provide an adjustment method for an expansive additive blending amount into a ready-mixed concrete, capable of determining an appropriate blending amount of expansive additive so as to secure a desired expansion amount in response to a setting time that varies each time, a manufacturing method for the ready-mixed concrete, etc.SOLUTION: An adjustment method for an expansive additive blending amount into a ready-mixed concrete containing cement, water, aggregate, admixture, and expansive additive includes the steps of: obtaining a correlation between an expansive additive blending amount of the ready-mixed concrete, a setting time of the ready-mixed concrete, and an expansion amount of the ready-mixed concrete; determining an estimated blending amount of expansive additive from an expected setting time of the ready-mixed concrete and a required setting expansion amount of the ready-mixed concrete based on the correlation; and blending the expansive additive into the ready-mixed concrete in the estimated blending amount. In the step of determining the correlation, the correlation is obtained by examining the expansion amount and the setting time for each ready-mixed concrete having a different blending amount of the expansive additive.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for adjusting the amount of expansion agent mixed into fresh concrete and a method for producing fresh concrete. The present invention also relates to an expansion agent amount adjustment system for implementing the method for adjusting the amount of expansion agent mixed into fresh concrete, a program for causing a computer to execute at least a part of the above adjustment method, and a program for causing a computer to function as, for example, the above expansion agent amount adjustment system.

Background Art

[0002] Conventionally, fresh concrete obtained by mixing cement, water, aggregates, etc. is transported after being mixed with admixtures and the like so as to have a desired fluidity, and is used at the site. Then, the fresh concrete loses its fluidity as the hydration reaction progresses and sets after a predetermined time (setting time). However, due to the influence of factors such as the high or low temperature at the site, fresh concrete may not have the desired fluidity. In this case, it may be difficult to use the fresh concrete at the site.

[0003] In response to this, a method of adjusting the amount of admixture for each use so that the fresh concrete has the desired fluidity or a method of further adding an additive has been adopted. As the latter method, for example, a method of rapidly reducing the fluidity of fresh concrete or the like by adding a carbonate or sulfate of an alkali metal immediately before placing is known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, as concrete, expansive concrete containing an expansive agent to prevent cracking due to drying shrinkage is known. Fresh concrete containing an expansive agent and an admixture for ensuring desired fluidity and the like may have a variable setting time due to the influence of the components contained in the admixture. For example, when the amount of the admixture is increased to ensure good fluidity of fresh concrete, good fluidity can be ensured, but the setting time may become longer. Also, the setting time may vary depending on the use environment of fresh concrete. Therefore, in fresh concrete containing an admixture and an expansive agent, the setting time can vary.

[0006] The inventors of the present application have found that when the setting time of fresh concrete containing an admixture and an expansive agent varies, the expansion amount of such fresh concrete also varies, that is, the expansion amount varies depending on the length of the setting time. For example, if the expansion amount becomes too large, the strength of the concrete may decrease. On the other hand, if the expansion amount becomes too small, shrinkage cracking may occur in the concrete. Therefore, it is necessary to determine an appropriate blending amount of the expansive agent that can ensure the desired expansion amount. Accordingly, there is a demand for a method that can determine an appropriate blending amount of the expansive agent so as to ensure the desired expansion amount in response to the setting time that varies each time. The inventors of the present application newly found that there is a correlation between the above-mentioned setting time and expansion amount, and focused on this point to complete the present invention.

[0007] In view of the above problems, points of attention, etc., an object of the present invention is to provide a method for adjusting the blending amount of an expansive agent in fresh concrete, and a method for manufacturing fresh concrete, which can determine an appropriate blending amount of the expansive agent so as to ensure the desired expansion amount in response to the setting time that varies each time. Another object is to provide an expansive agent blending amount adjustment system for implementing the above method for adjusting the blending amount of an expansive agent, a program for causing a computer to execute at least a part of the above adjustment method, and a program for causing a computer to function as the above system.

Means for Solving the Problems

[0008] In order to solve the above problems, a method for adjusting the amount of expansion agent in fresh concrete according to the present invention is a method for adjusting the amount of expansion agent in fresh concrete containing cement, water, aggregate, admixture, and expansion agent, a step of obtaining a correlation relationship among the amount of expansion agent in the fresh concrete, the setting time of the fresh concrete, and the expansion amount of the fresh concrete; a step of determining an estimated amount of expansion agent based on the correlation relationship from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete; and a step of adding the expansion agent to the fresh concrete in the estimated amount, and in the step of obtaining the correlation relationship, the correlation relationship is obtained by examining the expansion amount and the setting time for each fresh concrete having a different amount of expansion agent.

[0009] A method for manufacturing fresh concrete according to the present invention is a method for manufacturing fresh concrete containing cement, water, aggregate, admixture, and expansion agent, a step of obtaining a correlation relationship among the amount of expansion agent in the fresh concrete, the setting time of the fresh concrete, and the expansion amount of the fresh concrete; a step of determining an estimated amount of expansion agent based on the correlation relationship from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete; and a step of adding the expansion agent to the fresh concrete in the estimated amount, and in the step of obtaining the correlation relationship, the correlation relationship is obtained by examining the expansion amount and the setting time for each fresh concrete having a different amount of expansion agent.

[0010] An expansion agent amount adjustment system according to the present invention is a system for implementing the method for adjusting the amount of expansion agent in fresh concrete described above.

[0011] The program according to the present invention is a program for causing a computer to execute at least the step of determining the estimated blending amount of the expansive agent in the method for adjusting the blending amount of the expansive agent in the above-mentioned fresh concrete.

[0012] The program according to the present invention is a program for causing a computer to function as an expansive agent blending amount adjustment system that performs at least the step of determining the estimated blending amount of the expansive agent in the method for adjusting the blending amount of the expansive agent in the above-mentioned fresh concrete.

Advantages of the Invention

[0013] According to the method for adjusting the blending amount of the expansive agent in fresh concrete, the method for manufacturing fresh concrete, the system, and the program according to the present invention, it is possible to determine an appropriate blending amount of the expansive agent so as to ensure a desired expansion amount in response to the setting time that varies each time.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0015] Hereinafter, an embodiment of a method for adjusting the blending amount of the expansive agent in fresh concrete according to the present invention (hereinafter, also simply referred to as the adjustment method) will be described.

[0016] The adjustment method of this embodiment is a method for adjusting the amount of expansion material in fresh concrete containing cement, water, aggregate, admixture, and expansion material, a step of obtaining a correlation relationship among the amount of expansion material in the fresh concrete, the setting time of the fresh concrete, and the expansion amount of the fresh concrete; a step of determining an estimated amount of expansion material based on the correlation relationship from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete; and a step of mixing the expansion material into the fresh concrete in the estimated amount, In the step of obtaining the correlation relationship, the correlation relationship is obtained by examining the expansion amount and the setting time for each fresh concrete with a different amount of expansion material.

[0017] The above fresh concrete contains at least cement, water, aggregate, admixture, and expansion material.

[0018] The cement contained in the fresh concrete may include various cements defined by, for example, JIS R5210. Examples of the cement include ordinary Portland cement, early-strength Portland cement, ultra-early-strength Portland cement, medium-heat Portland cement, or low-heat Portland cement. The cement contained in the fresh concrete may contain any one of the above various cements, or may contain a plurality of the above.

[0019] The cement may contain blast furnace slag, fly ash, or silica, etc. In other words, the cement may be a blended cement containing blast furnace slag, fly ash, or silica, etc.

[0020] When ordinary Portland cement is adopted as the cement contained in the fresh concrete, the appropriate amount of expansion material can be determined more accurately.

[0021] The water contained in fresh concrete is not particularly limited, and examples thereof include tap water and the like.

[0022] The aggregate contained in fresh concrete includes, for example, at least one of fine aggregate and coarse aggregate. Fresh concrete includes, for example, both fine aggregate and coarse aggregate as aggregates.

[0023] As the fine aggregate and the coarse aggregate, those defined in Appendix A of JIS A5308 can be adopted. Examples of the fine aggregate include natural-derived sand such as river sand or sea sand, lime crushed sand, or slag-derived sand such as blast furnace slag. Examples of the coarse aggregate include natural aggregates such as river gravel or sea gravel, artificial aggregates such as crushed stone or lime crushed stone, or recycled aggregates. As the fine aggregate and the coarse aggregate, respectively, one kind alone among the above examples may be adopted, or a plurality of kinds may be combined.

[0024] The cement content in fresh concrete is, in terms of unit amount (kg / m 3 : mass per 1 m 3 of fresh concrete), for example, 260 kg / m 3 or more and 650 kg / m 3 or less. The cement content is preferably 270 kg / m 3 or more and 600 kg / m 3 or less. When fresh concrete contains a plurality of types of cement, the above content is the total cement content.

[0025] The water content in fresh concrete is, in terms of unit amount (kg / m 3 : mass per 1 m 3 of fresh concrete), for example, 165 kg / m 3 or more and 185 kg / m 3 or less. The water content may be 170 kg / m 3 or more and 185 kg / m 3 or less.

[0026] The water-cement ratio (W / C) in fresh concrete is not particularly limited, but is, for example, 30% or more and 70% or less. Such a water-cement ratio (W / C) may be 35% or more, or may be 40% or more. The above water-cement ratio (W / C) may be 68% or less, or may be 60% or less.

[0027] The content of fine aggregate in fresh concrete is based on the unit amount (kg / m 3 : per 1 m 3 of fresh concrete) and is, for example, 400 kg / m 3 or more and 1200 kg / m 3 or less. The content of fine aggregate may be 480 kg / m 3 or more and 950 kg / m 3 or less. When fresh concrete contains multiple types of fine aggregate, the above content is the total content of the fine aggregate.

[0028] The content of coarse aggregate in fresh concrete is based on the unit amount (kg / m 3 : per 1 m 3 of fresh concrete) and is, for example, 600 kg / m 3 or more and 1200 kg / m 3 or less. The content of coarse aggregate may be 650 kg / m 3 or more and 1150 kg / m 3 or less. When fresh concrete contains multiple types of coarse aggregate, the above content is the total content of the coarse aggregate.

[0029] The unit bulk volume of coarse aggregate in fresh concrete is, for example, 0.50 [m 3 / m 3 or more and 0.70 [m 3 / m 3 or less.

[0030] The air content in fresh concrete is, for example, 3.0% or more and 6.0% or less.

[0031] The admixtures contained in fresh concrete include, for example, components that do not significantly affect the hydration reaction, components that have the effect of promoting the hydration reaction, or components that have the effect of delaying the hydration reaction. Specific examples of admixtures containing components that have the effect of delaying the hydration reaction are the respective admixtures described in JIS A6204:2011 "Chemical Admixtures for Concrete". More specifically, examples of the admixtures include AE agents, high-performance water-reducing agents, hardening accelerators, water-reducing agents, AE water-reducing agents, high-performance AE water-reducing agents, or fluidizing agents. The water-reducing agents and AE water-reducing agents are each classified into a standard type, a delayed type, and an accelerated type. The high-performance AE water-reducing agents and fluidizing agents are each classified into a standard type and a delayed type. In addition, other examples of the delayed-type admixtures include inorganic compounds such as zinc oxide or phosphates, or organic compounds such as saccharides, oxycarboxylates such as citrate salts and gluconate salts. Examples of the accelerated-type admixtures include calcium chloride, nitrates, nitrites, alkanolamines, or hardening accelerators mainly containing particles (nanoparticles) containing calcium silicate. In other words, the admixtures include at least one selected from the group consisting of AE agents, high-performance water-reducing agents, hardening accelerators, water-reducing agents, AE water-reducing agents, high-performance AE water-reducing agents, fluidizing agents, and zinc oxide, phosphates, saccharides, oxycarboxylates, calcium chloride, nitrates, nitrites, alkanolamines, and particles containing calcium silicate, which are described in JIS A6204:2011 "Chemical Admixtures for Concrete".

[0032] The content of the admixture in fresh concrete is, for example, 0.2% or more and 5.0% or less by mass ratio with respect to the unit cement amount. The content of the admixture may also be 0.3% or more and 3.0% or less.

[0033] Examples of the expansive agents contained in fresh concrete include those generally known. For example, the expansive agent contains at least one of a calcium sulfoaluminate-based expansive agent that generates ettringite and a quicklime-based expansive agent that generates calcium hydroxide.

[0034] The content of the expansive agent in the fresh concrete is, for example, 10 kg / m 3 or more and 40 kg / m 3 or less. The content of the expansive agent may be 12 kg / m 3 or more and 35 kg / m 3 or less.

[0035] In the adjustment method of this embodiment, as shown in FIG. 1, a step of obtaining the correlation among the blending amount of the expansive agent in the fresh concrete, the setting time of the fresh concrete, and the expansion amount of the fresh concrete (hereinafter, also simply referred to as the correlation investigation step S1), a step of determining the estimated blending amount of the expansive agent based on the correlation from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete (hereinafter, also simply referred to as the estimated blending amount determination step S2), and a step of blending the expansive agent into the fresh concrete in the estimated blending amount (hereinafter, also simply referred to as the expansive agent blending step S3) are performed.

[0036] Note that after completing the above correlation investigation step, the above estimated blending amount determination step may be performed. On the other hand, after performing a part of the above correlation investigation step, a part of the above estimated blending amount determination step may be performed, and the correlation investigation step and the estimated blending amount determination step may be repeatedly performed.

[0037] Specifically, in the above correlation investigation step S1, the correlation is obtained by examining the expansion amount and the setting time for each fresh concrete with a different blending amount of the expansive agent. More specifically, for each of a plurality of fresh concretes with different blending amounts of the expansive agent, the expansion amount and the setting time are measured, and the correlation among the blending amount of the expansive agent, the expansion amount, and the setting time is examined.

[0038] The above correlation relationship is represented by, for example, a virtual plane or a virtual curved surface in a three-dimensional graph with the admixture content, the setting time, and the expansion amount as each axis. Therefore, if any two of the admixture content, the setting time, and the expansion amount are set, the remaining one can be obtained. For example, if the setting time and the expansion amount are set respectively, the admixture content of the expansion agent can be obtained.

[0039] As the setting time of fresh concrete, for example, the initial setting time measured according to JIS A1147:2019 "Test Method for Setting Time of Concrete" can be adopted. As the setting time of fresh concrete, measured values obtained by other setting time measurement methods may also be adopted.

[0040] The expansion amount of fresh concrete is measured, for example, by a measurement method according to Appendix B (Restrained Expansion and Shrinkage Test of Expansive Concrete) of JIS A6202:2017 "Expansion Agents for Concrete".

[0041] The method for obtaining the above correlation relationship is not particularly limited. For example, a correlation relationship may be obtained using conventionally known spreadsheet software or the like, or a correlation relationship may be obtained using computer software including a program created for obtaining the above correlation relationship.

[0042] A specific example of the method for obtaining the above correlation relationship is as follows. First, measure the setting time and the expansion amount of each of a plurality of fresh concretes with different dosages of admixtures and expansion agents. Next, plot the measurement results on a two-dimensional graph with the horizontal axis representing the setting time and the vertical axis representing the expansion amount. In the graph after plotting, even if the admixture content is different between the plots of fresh concrete with approximately the same amount of expansive agent, a linear correlation is recognized between the setting time and the expansion amount. The functional expression representing such a linear function is obtained using the least squares method or the like. Since a functional expression of a linear function is obtained for each group of plots with the same amount of expansive agent, a plurality of functional expressions are obtained. These plurality of functional expressions may be referred to as a group of functional expressions of linear functions hereinafter.

[0043] In the above-described estimated blending amount determination step S2, for example, the estimated blending amount of the expansive agent is obtained from the above-described correlation. A specific example of the method for determining such an estimated blending amount is as follows.

[0044] Set a desired value for the expansion amount of the fresh concrete actually produced. For the case where the expansion amount is the desired value, plot a plurality of points on a two-dimensional graph with the horizontal axis representing the setting time and the vertical axis representing the blending amount of the expansive agent. At this time, the plurality of points can be obtained using each functional expression of the above-described group of functional expressions of linear functions. Specifically, by substituting the above-described desired value of the expansion amount into each functional expression, the value of the setting time when the expansion amount is the desired value is calculated from each functional expression. As a result, in the case where the expansion amount is the desired value, the relationship between the setting time and the blending amount of the expansive agent is shown in the graph. In the graph after plotting, when the expansion amount is the desired value, a linear correlation is recognized between the blending amount of the expansive agent and the setting time. The functional expression representing such a linear function is obtained using the least squares method or the like. Using such a functional expression, the estimated blending amount of the expansive agent can be determined from the setting time. Note that the setting time in this case is the predicted setting time and can be set as follows.

[0045] The above predicted setting time can be calculated from the reference setting time in consideration of the factors affecting the setting time. For example, among the plurality of fresh concretes prepared in the above correlation investigation process, the predicted setting time can be obtained based on the setting time measured for one fresh concrete.

[0046] Examples of the factors affecting the setting time include, for example, the type of cement, temperature, water-cement ratio, type of admixture, or the blending amount of the admixture. Specifically, generally, when the temperature rises, the setting time becomes shorter. Also, generally, when the blending amount of an admixture containing a component that delays the hydration reaction increases, the setting time becomes longer. Hereinafter, specific examples for calculating the above predicted setting time will be described in detail.

[0047] The influence of temperature on the setting time of fresh concrete is described in known technical materials (such as "Cement Technical Materials 2nd Edition, Sumitomo Osaka Cement", etc.). Based on the description content in this type of technical literature, the change amount of the setting time when the temperature changes by 1 °C can be calculated. Specifically, based on the setting time when a plurality of fresh concretes with the same mix composition are left standing in different temperature environments, the change amount of the setting time per 1 °C of temperature can be calculated.

[0048] The influence of the admixture blending amount on the setting time of fresh concrete is described in known technical materials (such as "Basic Research on the Setting Delay of Concrete by High-Performance Water-Reducing Agents", Transactions of the Japan Concrete Institute, Vol. 5, No. 1, 1994, etc.). Based on the description content in this type of technical literature, the change amount of the setting time when the blending amount of the admixture changes by a unit amount can be calculated. Specifically, based on the setting time when a plurality of fresh concretes with different blending amounts of the admixture are left standing under certain temperature conditions, the change amount of the setting time per unit amount of the admixture blending amount can be calculated. Alternatively, regarding the influence of the admixture dosage on the setting time of fresh concrete, for example, based on the measured values of the setting times of fresh concrete prepared with different admixture dosages in the above-mentioned correlation investigation process, the change amount of the setting time when the admixture dosage changes by a unit amount can be calculated. Specifically, based on the setting times of a plurality of fresh concretes with different admixture dosages when left standing under certain temperature conditions, the change amount of the setting time per unit amount of the admixture dosage can be calculated.

[0049] Similarly, regarding the water-cement ratio, for example, referring to known technical materials such as "Proceedings of the Concrete Engineering Annual Conference, Vol. 29, No. 1, 2007, Setting Time of Concrete Using Retarders and Its Prediction Formula p. 281 Table - 5", the change amount of the setting time when the water-cement ratio changes by a unit amount can be calculated. Similarly, regarding the type of admixture, for example, referring to known technical materials such as JIS A6204 "Chemical Admixtures for Concrete" p. 414 Table 3, the change amount of the setting time when the type of admixture is different can be calculated. Similarly, regarding the type of cement, for example, referring to known technical materials such as "Cement Technical Data 2nd Edition, Sumitomo Osaka Cement p. 9 Table 4.3 - 1", the change amount of the setting time when the type of cement is different can be calculated.

[0050] And, among the fresh concretes prepared in the above-mentioned correlation investigation process, based on the setting time measured for one fresh concrete as a reference, the predicted setting time can be obtained from the change amounts calculated as described above.

[0051] In the above-mentioned expansive agent mixing step S3, fresh concrete is prepared so as to have the mixing amount of the expansive agent obtained in the above-mentioned estimated mixing amount determination step. For example, the amount of fine aggregate or coarse aggregate in the fresh concrete may be increased or decreased by the amount by which the mixing amount of the expansive agent is increased or decreased.

[0052] Next, an embodiment of the method for manufacturing fresh concrete according to the present invention (hereinafter, also simply referred to as the manufacturing method) will be described.

[0053] The manufacturing method of this embodiment is a method for manufacturing fresh concrete containing cement, water, aggregate, admixture, and expansive agent, a step of obtaining the correlation between the amount of the expansive agent in the fresh concrete, the setting time of the fresh concrete, and the expansion amount of the fresh concrete, a step of determining the estimated amount of the expansive agent based on the correlation from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete, and a step of blending the expansive agent into the fresh concrete in the estimated amount, In the step of obtaining the correlation, the correlation is obtained by examining the expansion amount and the setting time for each fresh concrete with a different amount of the expansive agent.

[0054] The manufacturing method of the fresh concrete of this embodiment can be implemented by the same method as the method for adjusting the amount of the expansive agent in the fresh concrete described above. By the manufacturing method of the fresh concrete of this embodiment, for example, fresh concrete having a desired expansion amount can be manufactured.

[0055] Subsequently, an embodiment of an expansive agent amount adjustment system (hereinafter, also simply referred to as a system) according to the present invention will be described.

[0056] The system of this embodiment is a system for implementing the method for adjusting the amount of the expansive agent in the fresh concrete described above.

[0057] As shown in FIG. 2, for example, the system of this embodiment includes a measurement unit 11 that measures the amount of the expansive agent, the setting time, and the expansion amount in order to obtain the correlation between the amount of the expansive agent in the fresh concrete, the setting time of the fresh concrete, and the expansion amount of the fresh concrete, and a calculation unit 12 for determining the estimated amount of the expansive agent based on the correlation from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete. A manufacturing unit that manufactures fresh concrete by mixing the expansion material into the fresh concrete in the estimated blending amount, is provided at least. The measuring unit 11 is configured to be able to measure the expansion amount and the setting time for each fresh concrete with a different blending amount of the expansion material.

[0058] Note that the measuring unit 11 may also serve as the manufacturing unit. In other words, the measuring unit 11 and the manufacturing unit may be the same facility or different facilities from each other. For example, the measuring unit 11 may be a facility separate from the manufacturing unit, and the system of the present embodiment may be configured such that the amount of fresh concrete produced by the manufacturing unit is larger than the amount of fresh concrete produced by the measuring unit 11.

[0059] In the system 10 of the present embodiment, the above-described materials are adopted as the raw materials for fresh concrete. Further, in the system 10 of the present embodiment, the above-described correlation investigation process, estimated blending amount determination process, and expansion material blending process can be respectively implemented, and other processes can be implemented as necessary.

[0060] The measuring unit 11 is configured to mix each raw material of the fresh concrete described above to prepare fresh concrete and to advance the hydration reaction in the prepared fresh concrete. Further, the measuring unit 11 is configured to be able to measure the setting time and the expansion amount of the prepared fresh concrete, respectively.

[0061] As shown in FIG. 3, for example, the measuring unit 11 includes a weighing device for weighing each raw material of fresh concrete, a mixing device for mixing the raw materials of fresh concrete, and the like. For example, the measuring unit 11 is configured to mix a plurality of raw materials respectively weighed by the weighing device by the mixing device to prepare fresh concrete.

[0062] As shown in FIG. 3, for example, the measuring unit 11 includes a temperature control device for advancing the hydration reaction in fresh concrete under a predetermined temperature condition, a humidity control device for advancing the hydration reaction in fresh concrete under a predetermined humidity condition, and the like. For example, the measuring unit 11 is configured to place the fresh concrete in a space that is controlled to a desired temperature and a desired humidity by a temperature control device and a humidity control device.

[0063] As shown in FIG. 3, for example, the measuring unit 11 has measuring instruments for measuring the physical properties of fresh concrete during the progress of the hydration reaction. The measuring unit 11 has, for example, measuring instruments for measuring the setting time of fresh concrete. For example, the measuring unit 11 is configured to be equipped with such measuring instruments so that the setting time of fresh concrete during the progress of the hydration reaction can be measured by the measuring instruments. The setting time of fresh concrete is measured, for example, in accordance with JIS A1147:2019 "Test Method for Setting Time of Concrete".

[0064] In addition, the measuring unit 11 has, for example, measuring instruments for measuring the expansion amount of fresh concrete. For example, the measuring unit 11 is configured to be equipped with such measuring instruments so that the expansion amount of fresh concrete during the progress of the hydration reaction can be measured by the measuring instruments. The expansion amount of fresh concrete is measured by the measurer implementing a method in accordance with Appendix B (Restrained Expansion and Shrinkage Test of Expansive Concrete) of JIS A6202:2017 "Expansion Agents for Concrete". In the measurement carried out by such a method, the expansion amount after a predetermined number of days from 7 days after the age of the material to 14 days after the age of the material can be adopted as the above-mentioned expansion amount.

[0065] As shown in FIG. 3, for example, the measuring unit 11 is equipped with an input device and has a configuration that allows the mixing amount of the expansion agent, and the setting time and expansion amount of the fresh concrete measured as described above to be input into the input device. On the other hand, the measuring unit 11 may have a configuration that can automatically transmit (input) the mixing amount of the expansion agent measured by the weighing device, and the setting time and expansion amount of the fresh concrete measured as described above from the measuring instruments to the input device by an electrical signal. The input device may have a storage device that electronically and temporarily stores all the measured values of the input setting time and expansion amount. The measurement unit 11 may include a display device as shown in FIG. 3, for example, and may be configured to display the above-mentioned setting time and expansion amount input to the input device on the display device respectively. In addition, the measurement unit 11 may be configured to be able to measure the setting time and the expansion amount automatically or semi-automatically by, for example, an automatic concrete setting test device (such as those manufactured by Tesco).

[0066] In the present embodiment, the calculation unit 12 includes, for example, a computer. The calculation unit 12 is configured such that a program stored in an external storage device (for example, a magnetic tape, a magnetic disk such as a flexible disk or a hard disk, an optical disk such as a CD or a DVD, a magneto-optical disk such as an MO, a semiconductor memory such as a USB memory or a memory card) can be installed in the computer. The internal storage device and the external storage device are recording media capable of reading programs and the like. Note that the program may be provided to the computer by means of wired or wireless communication such as the Internet or a dedicated line. The computer is not particularly limited as long as it is a device equipped with a recording device, a calculation device, a control device, etc., and for example, a personal computer is adopted.

[0067] In the above-mentioned correlation investigation process, the calculation unit 12 is configured to receive each numerical value of the admixture dosage in the fresh concrete and the above-mentioned setting time and expansion amount measured by the measurement unit 11 as electrical signals and store them electronically. Each of the above numerical values may be stored in the internal storage device of the computer, or may be stored in an electronic storage medium (external storage device) detachable from the computer. The electrical signal may be received by means of wired communication, or may be received by means of wireless communication. Alternatively, the calculation unit 12 may obtain each of the above numerical values via, for example, an electronic storage medium.

[0068] The calculation unit 12 is configured to electronically plot, on a three-dimensional graph, for example, the setting times and amounts of expansion of a plurality of types of fresh concrete with different amounts of expansion material incorporated therein, by executing a program using a computer, in order to carry out the above-described correlation investigation process. Further, the calculation unit 12 is configured to form, on the above three-dimensional graph, a virtual plane or virtual curved surface that is set to connect a large number of plots to each other, using the least squares method or the like. The correlation can be indicated by a virtual plane or virtual curved surface, for example, by executing a program using a computer.

[0069] The calculation unit 12 is configured to obtain the remaining one specific value by setting any two predetermined values among the amount of expansion material incorporated, the setting time, and the amount of expansion, from the correlation obtained as described above, in order to carry out the above-described estimated mixture ratio determination process. For example, by specifying the setting time (expected setting time) and the amount of expansion (set amount of expansion) respectively, the amount of expansion material incorporated (estimated amount of expansion material to be incorporated) can be calculated by executing a program using a computer.

[0070] The calculation unit 12 may be configured to calculate the expected setting time of the fresh concrete. Specifically, the calculation unit 12 may be configured to calculate the expected setting time by increasing or decreasing the increase or decrease in the setting time due to factors affecting the setting time from a reference setting time. For example, by executing a program using a computer, the expected setting time can be obtained based on the setting time actually measured for a certain type of fresh concrete.

[0071] Examples of factors affecting the setting time include, as described above, the type of cement, temperature, water-cement ratio, type of admixture, or amount of admixture incorporated. The effects of temperature and amount of admixture incorporated on the setting time of fresh concrete are as described above. The calculation unit 12 may be configured to calculate the amount of change in the setting time per 1 °C of temperature, for example, by executing a program on a computer, based on experimental results described in academic literature or the like. Similarly, the calculation unit 12 may be configured to calculate the amount of change in the setting time per unit amount of admixture content, for example, by executing a program on a computer. Note that the calculation unit 12 may be configured to calculate the amount of change in the setting time given by each of the type of cement, the water-cement ratio, or the type of admixture, for example, by executing a program on a computer.

[0072] The method of executing the above calculations and the like by the calculation unit 12 is not particularly limited. For example, calculations and the like may be executed using conventionally known spreadsheet software or the like, or calculations and the like may be executed using computer software including a program created to obtain the above correlation.

[0073] The calculation unit 12 is configured to perform the above correlation investigation step and estimated blending amount determination step, record and display the correlation between the expansion material blending amount, the setting time, and the expansion amount, and based on the above correlation, calculate, record, and display the estimated blending amount of the expansion material from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete. In addition, the calculation unit 12 has a configuration to calculate, record, and display the above predicted setting time as needed.

[0074] The calculation unit 12 includes a computer equipped with a program, and has a configuration capable of executing the above calculations (calculations and computations) by the program provided in the computer. Note that the calculation unit 12 may be configured to transmit the result of the correlation obtained in the above correlation investigation step and the estimated blending amount of the expansion material calculated in the above estimated blending amount determination step to the display device of the measurement unit 11 by an electric signal. Such a command may be controlled by a program provided in the computer. The electric signal may be transmitted by wired communication means or wireless communication means.

[0075] In the control system of the system 10 according to this embodiment, as shown in FIG. 3 for example, a computer of the arithmetic unit 12 includes a CPU (Central Processing Unit) which is an example of a hardware processor, a RAM (Random Access Memory) which is an example of a recording medium, an internal storage device, and an I / O port which is an example of an input / output interface. The RAM, the internal storage device, and the I / O port are configured to be able to exchange data with the CPU via an internal bus. Further, an input / output device having a display terminal and an input terminal, for example, and an external storage device are connected to the computer.

[0076] The internal storage device is composed of, for example, a flash memory or a hard disk drive (HDD). A control program for controlling reception of an electrical signal from the measurement unit 11 and the like is stored in the internal storage device in a manner readable as a program. Further, in the internal storage device, a statistical program for obtaining the correlation between the amount of expansion material compounded, and the measured setting time and expansion amount, and a calculation program for calculating the estimated compounding amount of the expansion material from the predicted setting time and the set expansion amount based on the above correlation are stored in a manner readable as a program. Hereinafter, these statistical programs, calculation programs, and the like are collectively referred to simply as programs. The RAM functions as a memory area (work area) that temporarily holds programs, data, etc. read by the CPU.

[0077] The I / O port is connected to the above-described measurement unit 11 and the like.

[0078] The CPU is configured to read and execute a statistical program for obtaining the above correlation from the internal storage device by receiving the amount of expansion material compounded received from the measurement unit 11 via the I / O port and the electrical signals of the measured values of the setting time and the expansion amount, and is also configured to read and execute a calculation program for calculating the estimated compounding amount of the expansion material based on the obtained correlation from the internal storage device.

[0079] The input / output device is configured to allow an operator to input a predetermined expected setting time and a predetermined set expansion amount. These predetermined values are recorded in the internal storage device and will be used, for example, during the execution of the above-described calculation program. Also, the input / output device is configured to be able to display the expected setting time calculated by the execution of the calculation program. The expected setting time may be recorded in the internal storage device.

[0080] The present invention also includes a manufacturing system (a fresh concrete manufacturing system) for implementing the above-described method for manufacturing fresh concrete. Such a manufacturing system is for implementing the above-described method for manufacturing fresh concrete. Such a manufacturing system is configured, for example, in the same manner as the above-described admixture dosage adjustment system. Such a manufacturing system includes the above-described measuring unit 11 and the above-described manufacturing unit, and may be configured such that the manufacturing unit can manufacture a larger amount of fresh concrete than the measuring unit 11.

[0081] Furthermore, an embodiment of the program according to the present invention will be described.

[0082] The program of one embodiment is a program for causing a computer to execute at least the step of determining the estimated dosage of the admixture in the above-described method for adjusting the dosage of the admixture in fresh concrete. The program of another embodiment is a program for causing a computer to function as an admixture dosage adjustment system that implements at least the step of determining the estimated dosage of the admixture in the above-described method for adjusting the dosage of the admixture in fresh concrete. Hereinafter, both the program of one embodiment and the program of another embodiment will be referred to as the program of this embodiment.

[0083] The program of the present embodiment is for causing a computer to function in a facility (system 10) that implements the method for adjusting the amount of expansion agent to be added to fresh concrete described above. In other words, the program of the present embodiment is for causing a computer to implement at least the above-described estimated mixing amount determination step among the method for adjusting the amount of expansion agent to be added to fresh concrete or the method for manufacturing fresh concrete described above. The program of the present embodiment is incorporated, for example, in a facility (system 10) that implements the method for adjusting the amount of expansion agent to be added to fresh concrete or the method for manufacturing fresh concrete described above.

[0084] The above program may be recorded, for example, in an internal storage device of the computer of the arithmetic unit 12 or an external storage device detachable from the arithmetic unit 12.

[0085] In the present embodiment, for example, the functions of the arithmetic unit 12 described above can be realized by operating according to a program that the arithmetic unit 12 has. The above program is created in various known programming languages.

[0086] In the present embodiment, the program can be stored and supplied to a computer by being recorded on various types of recording media. Note that the program may be executed in a state temporarily recorded on the recording medium or in a state non-temporarily recorded on the recording medium.

[0087] The arithmetic unit 12 has a program in the computer that can capture each measurement value signal of the amount of expansion agent in fresh concrete, the setting time of fresh concrete, and the expansion amount of fresh concrete obtained by the measurement unit 11 through the above I / O port. Further, the arithmetic unit 12 has a program in the computer that obtains the above correlation from the above measurement value signals. Further, the arithmetic unit 12 has a program in the computer that can send the estimated mixing amount of the expansion agent obtained from the above correlation by calculation by the program in the computer to the input / output device of the arithmetic unit 12.

[0088] In the above-described system 10, at least the above-described estimated compounding amount determination step of the method for adjusting the amount of expansion material (method for manufacturing fresh concrete) is realized, for example, by a hardware processor such as a CPU in the computer of the calculation unit 12 executing a program. Part or all of the above-described estimated compounding amount determination step may be realized by hardware, or may be realized by the cooperation of software and hardware.

[0089] The above program is configured to execute the above-described estimated compounding amount determination step of the method for adjusting the amount of expansion material in the above-described system 10, and to execute part or all of the above-described correlation investigation step as necessary. Further, the above program is configured to execute the above-described estimated compounding amount determination step of the method for manufacturing fresh concrete in the above-described system 10, and to execute part or all of the above-described correlation investigation step as necessary. As part of the above-described correlation investigation step, for example, there are procedures for representing the correlation by a virtual plane or a virtual curved surface in a three-dimensional graph with the above-described amount of expansion material, the setting time, and the amount of expansion as each axis as described above.

[0090] By the computer of the calculation unit 12 executing the above program, in the above-described system 10, for example, all or part of the above-described correlation investigation step and the estimated compounding amount determination step can be executed. Note that part of the above-described correlation investigation step may be executed by other means instead of program execution.

[0091] In other words, in the expansion material amount adjustment system 10 (fresh concrete manufacturing system) of the present embodiment, in order to execute at least the above-described estimated compounding amount determination step of the method for adjusting the amount of expansion material in fresh concrete or the method for manufacturing fresh concrete, or in order to function at least the above-described estimated compounding amount determination step of the above-described expansion material amount adjustment system 10 (fresh concrete manufacturing system), the computer of the calculation unit 12 executes a predetermined program. For example, in the above method for adjusting the admixture amount of the expansion material, the correlation investigation step can be carried out by an operator (person), while the estimated admixture amount determination step can be carried out via a computer program. Also, for example, in the above method for adjusting the admixture amount of the expansion material, a part of the correlation investigation step can be carried out by an operator (person), and the remaining part can be carried out via a computer program, and the estimated admixture amount determination step can be carried out via a computer program.

[0092] The method for adjusting the admixture amount of the expansion material to the fresh concrete and the method for manufacturing the fresh concrete of the present embodiment are as exemplified above, but the present invention is not limited to the above methods. That is, various forms used in general methods for manufacturing fresh concrete and the like can be adopted within a range that does not impair the effects of the present invention.

[0093] The matters disclosed by this specification include the following. (1) A method for adjusting the admixture amount of an expansion material to fresh concrete containing cement, water, aggregate, admixture, and expansion material, a step of obtaining a correlation between the admixture amount of the expansion material in the fresh concrete, the setting time of the fresh concrete, and the expansion amount of the fresh concrete; a step of determining an estimated admixture amount of the expansion material based on the correlation from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete; a step of adding the expansion material to the fresh concrete in the estimated admixture amount, and comprising: in the step of obtaining the correlation, the correlation is obtained by examining the expansion amount and the setting time for each fresh concrete with a different admixture amount of the expansion material; A method for adjusting the admixture amount of an expansion material to fresh concrete. (2) The admixture is at least one selected from the group consisting of AE agents, high-performance water-reducing agents, hardening accelerators, water-reducing agents, AE water-reducing agents, high-performance AE water-reducing agents, fluidizing agents, and particles containing zinc oxide, phosphates, saccharides, oxycarboxylates, calcium chloride, nitrates, nitrites, alkanolamines, and calcium silicate, and is the method for adjusting the amount of expansion agent to be added to fresh concrete as described in (1) above. (3) The expansion agent contains at least one of calcium sulfoaluminate-based expansion agents that generate ettringite and quicklime-based expansion agents that generate calcium hydroxide, and is the method for adjusting the amount of expansion agent to be added to fresh concrete as described in (1) or (2) above. (4) The water-cement ratio (W / C) of the fresh concrete is 30% or more and 70% or less, and is the method for adjusting the amount of expansion agent to be added to fresh concrete as described in any one of (1) to (3) above. (5) A method for producing fresh concrete containing cement, water, aggregates, an admixture, and an expansion agent, a step of obtaining a correlation between the amount of expansion agent in the fresh concrete, the setting time of the fresh concrete, and the amount of expansion of the fresh concrete; a step of determining an estimated amount of expansion agent to be added based on the correlation, from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete; and a step of adding the expansion agent to the fresh concrete in the estimated amount, In the step of obtaining the correlation, the correlation is obtained by examining the amount of expansion and the setting time for each fresh concrete having a different amount of expansion agent added. A method for producing fresh concrete. (6) An expansion agent amount adjustment system for implementing the method for adjusting the amount of expansion agent to be added to fresh concrete as described in any one of (1) to (4) above. (7) A program for causing a computer to execute at least the step of determining an estimated compounding amount of the expansion material in the method for adjusting the compounding amount of the expansion material in fresh concrete according to any one of (1) to (4) above. (8) A program for causing a computer to function as an expansion material compounding amount adjustment system that performs at least the step of determining an estimated compounding amount of the expansion material in the method for adjusting the compounding amount of the expansion material in fresh concrete according to any one of (1) to (4) above. (9) An expansion material compounding amount adjustment system for carrying out the method for producing fresh concrete according to (5) above. (10) A program for causing a computer to execute at least the step of determining an estimated compounding amount of the expansion material in the method for producing fresh concrete according to (5) above. (11) A program for causing a computer to function as an expansion material compounding amount adjustment system that performs at least the step of determining an estimated compounding amount of the expansion material in the method for producing fresh concrete according to (5) above.

Examples

[0094] Next, the present invention will be described in more detail with reference to experimental examples, but the present invention is not limited thereto.

[0095] (Test Examples 1 to 15) Using the materials shown in Table 1, fresh concrete for each test example was prepared with the mixing compositions shown in Table 2. For each prepared fresh concrete, a correlation investigation step and an estimated compounding amount determination step were carried out.

[0096]

Table 1

[0097]

Table 2

[0098] <Correlation Investigation Step> According to each composition shown in Table 2, each fresh concrete of Test Examples 1 to 15 was prepared. Specifically, each raw material was mixed to prepare each fresh concrete. In addition, for any fresh concrete, the slump value, which is an index of fluidity, was about 18 cm. Also, in any test example, the compressive strength after 28 days of age was about 50 N / mm 2 was obtained. (Setting time) The setting time of each fresh concrete was measured according to JIS A1147:2019 "Test Method for Setting Time of Concrete". (Expansion amount) The expansion amount of each fresh concrete was measured according to Appendix B (Restrained Expansion and Shrinkage Test of Expansive Concrete) of JIS A6202:2017 "Expansion Agents for Concrete".

[0099] (Procedure 1) The above measurement results of each test example were plotted on a graph with the horizontal axis (X-axis) being the setting time and the vertical axis (Y-axis) being the expansion amount. A linear function was recognized as a correlation between the plots of multiple test examples with the same admixture amount of the expansion agent (Test Examples 1 to 6, Test Examples 7 to 10, Test Examples 11 to 15). The linear function was obtained by the least squares method. Specifically, three patterns of linear functions represented by the following formula (A) were recognized. Y (expansion amount) = a × X (setting time) + b ··· Formula (A) More specifically, the following three correlations were obtained. Y = -14.3X + 238 (admixture amount of expansion agent 20 kg / m 3 ) ··· Formula (A1) Y = -19.6X + 324 (admixture amount of expansion agent 25 kg / m 3 ) ··· Formula (A2) Y = -34.7X + 521 (admixture amount of expansion agent 30 kg / m 3 ) ··· Formula (A3) A graph showing the above results is shown in Figure 4.

[0100] (Procedure 2) Next, the required expansion amount was set. For example, as the required expansion amount, 200×10-6 was set. The relationship between the amount of expansion material and the setting time was examined when the expansion amount was 200×10 -6 . Specifically, X (setting time) was calculated when Y in the above formulas (A1) to (A3) was 200×10 -6 , and the calculation results were plotted on a graph where the horizontal axis (XX axis) is the setting time and the vertical axis (YY axis) is the amount of expansion material. As a result, a linear function was recognized as a correlation between the amount of expansion material and the setting time. The linear function was obtained by the least squares method. Specifically, a linear function represented by the following formula (B) was recognized. YY (amount of expansion material) = a×XX (setting time) + b ··· Formula (B) More specifically, the following correlation was obtained. YY = -1.54XX + 15.8 ··· Formula (B1) In addition, even when values other than 200×10 -6 were set as the required expansion amount, a linear function was similarly recognized as a correlation. A graph showing the above results is shown in FIG. 5.

[0101] <Estimated Blending Amount Determination Step> (Procedure 3) The predicted setting time was calculated by adding or subtracting the time for the factors affecting the setting time to the reference setting time (reference setting time). Specifically, as factors affecting the setting time, temperature (ambient temperature) and the amount of admixture were adopted, and the predicted setting time was calculated from the reference setting time after taking these factors into account. As a method for measuring the setting time, it was measured according to JIS A1147:2019 "Test Method for Setting Time of Concrete". · Temperature Factor This time, the results of ordinary Portland cement (symbol N) described in Table 4.3-1 on page 9 of the material "Cement Technical Data, 2nd Edition, Sumitomo Osaka Cement" were referred to. The starting time (setting time) was plotted on a graph with the horizontal axis representing temperature and the vertical axis representing the starting time for environmental temperatures of 20°C, 30°C, and 35°C. Using the least squares method, the correlation of the three plots was represented by a linear function. As a result, the slope P (-0.019) of the linear function was calculated. · Factor of admixture dosage The results of the above Test Examples 1, 4, 7, 9, 11, and 13 (using SP2 and no T) were plotted on a graph with the horizontal axis representing the admixture dosage and the vertical axis representing the starting time (setting time). Using the least squares method, the correlation of the multiple plots was represented by a linear function. As a result, the slope Q (+5.2189) of the linear function was calculated. · Predicted setting time The above Test Example 3 (reference temperature 30°C, reference admixture dosage 1.90%, reference setting time 6.0 hours) was used as a reference. When estimating the predicted setting time, since the temperature was 28°C, it was predicted that the setting time would be delayed by 0.238 hours based on the slope P (-0.019) of the above linear function and the temperature difference -2°C from the reference temperature. Also, when estimating the predicted setting time, since the admixture dosage was 1.75%, it was predicted that the setting time would be advanced by 0.783 hours based on the slope Q (+5.2189) of the above linear function and the dosage difference -0.15% from the reference admixture dosage. Then, by adding 0.238 hours to the reference setting time and further subtracting 0.783 hours, a predicted setting time of 5.5 hours was calculated.

[0102] (Procedure 4) For XX in formula (B1) obtained as above, for example, a setting time of 5.5 hours was substituted. As a result, 24.25 kg / m 3 was calculated as YY (expansion material dosage). In the above manner, the appropriate dosage of the expansion material was estimated to ensure the desired expansion amount (for example, 200×10 -6 ).

[0103] <Expansion Material Blending Process> Fresh concrete was produced according to the blending composition shown in the "Confirmation Test" of Table 2. The blending amount of the expansion material was the estimated value (24.25 kg / m 3 ) as described above. The setting time and expansion amount of the produced fresh concrete were measured by the methods described above. As a result, the expansion amount was 202×10 -6 , which was almost the same as the estimated value. The setting time was 5.45 hours, which was almost the same as the value substituted in Step 4 above.

[0104] As can be understood from the above results, by producing fresh concrete by the production method corresponding to the embodiment of the present invention, an appropriate blending amount of the expansion material can be determined so as to ensure a desired expansion amount corresponding to the setting time that varies each time.

Industrial Applicability

[0105] The method for adjusting the blending amount of the expansion material in fresh concrete, the production method of fresh concrete, the system, and the program of the present invention are preferably used, for example, to produce fresh concrete having a desired expansion amount.

Explanation of Reference Numerals

[0106] 10: Expansion Material Blending Amount Adjustment System (Fresh Concrete Production System), 11: Measuring Unit, 12: Arithmetic Unit.

Claims

1. A method for adjusting the amount of expansive agent in fresh concrete containing cement, water, aggregate, admixture, and expansive agent, comprising: a step of obtaining the correlation between the amount of expansive agent in the fresh concrete, the setting time of the fresh concrete, and the expansion amount of the fresh concrete; a step of determining the estimated amount of expansive agent based on the correlation, from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete; a step of adding the expansive agent to the fresh concrete in the estimated amount; and in the step of obtaining the correlation, the correlation is obtained by examining the expansion amount and the setting time for each fresh concrete having a different amount of expansive agent added. A method for adjusting the amount of expansive agent in fresh concrete.

2. The admixture is at least one selected from the group consisting of AE agents, high-performance water reducers, hardening accelerators, water reducers, AE water reducers, high-performance AE water reducers, superplasticizers, and particles containing zinc oxide, phosphates, saccharides, oxycarboxylates, calcium chloride, nitrates, nitrites, alkanolamines, and calcium silicate, as described in JIS A6204:2011 "Chemical Admixtures for Concrete". The method for adjusting the amount of expansive agent in fresh concrete according to Claim 1.

3. The expansive agent contains at least one of a calcium sulfoaluminate-based expansive agent that generates ettringite and a quicklime-based expansive agent that generates calcium hydroxide. The method for adjusting the amount of expansive agent in fresh concrete according to Claim 1 or 2.

4. The water-cement ratio (W / C) of the fresh concrete is 30% or more and 70% or less. The method for adjusting the amount of expansive agent in fresh concrete according to Claim 1 or 2.

5. A method for manufacturing fresh concrete containing cement, water, aggregate, admixture, and expansive agent, comprising: a step of obtaining the correlation between the amount of expansive agent in the fresh concrete, the setting time of the fresh concrete, and the expansion amount of the fresh concrete; a step of determining the estimated amount of expansive agent based on the correlation, from the predicted setting time of the fresh concrete and the required set expansion amount of the fresh concrete; a step of adding the expansive agent to the fresh concrete in the estimated amount; and In the step of obtaining the correlation, for each fresh concrete having a different blending amount of the expansion material, the correlation is obtained by examining the amount of expansion and the setting time. Method for producing fresh concrete. Claim 6 Expansion material blending amount adjustment system for implementing the method for adjusting the blending amount of the expansion material in the fresh concrete according to Claim 1. Claim 7 Program for causing a computer to execute at least the step of determining the estimated blending amount of the expansion material in the method for adjusting the blending amount of the expansion material in the fresh concrete according to Claim 1. Claim 8 Program for causing a computer to function as an expansion material blending amount adjustment system that performs at least the step of determining the estimated blending amount of the expansion material in the method for adjusting the blending amount of the expansion material in the fresh concrete according to Claim 1.

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