Quality management system, management device, program, and quality management method

Abstract

To provide a quality control system, a management device, a program, and a quality control method for supporting avoidance of blockage of concrete to be pumped.SOLUTION: This quality control system is provided with a control device 1 for controlling the quality of concrete conveyed from a plant 2 to a job site by an agitator truck 3, a slump measuring device 5 for measuring slump when receiving the concrete, a temperature measuring device 7 for measuring the temperature of the concrete, and a display device 6 for displaying quality information of the concrete to be concrete force-fed. The management device 1 includes a calculation part 11 for calculating the slump in the pipe 42 using the correlation information 14, the slump at the time of reception, the temperature, the time elapsed from the time of manufacture, and the time from the time of manufacture to the time of unloading, and a display control part 12 for displaying the calculated slump on a display device 6.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a quality control system, a control device, a program, and a quality control method. [Background technology]

[0002] In recent years, there has been active development of technology related to quality control of concrete unloaded from ready-mix concrete trucks, and related inventions have been made public. For example, Patent Document 1 discloses a method for checking the properties of concrete. In the invention of Patent Document 1, the flow rate and velocity ratio of concrete are calculated from a video of the concrete flowing down the chute of an agitator truck, and the calculated flow rate and velocity ratio are used to identify the slump or slump flow of the concrete. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-116454 Summary of the Invention [Problem to be solved by the invention]

[0004] As the slump of concrete changes over time, it can clog the concrete while it is being pumped. The invention of Patent Document 1 only focuses on the concrete flowing down the chute of the agitator truck, and is insufficient to prevent the concrete from clogging while being pumped. Conventional inventions leave room for improvement in the quality control of concrete.

[0005] From this perspective, an object of the present invention is to provide a quality control system, a control device, a program, and a quality control method that assist in preventing blockage of pumped concrete. [Means for solving the problem]

[0006] The present invention, which solves the above-mentioned problems, is a quality control system comprising: a control device for controlling the quality of concrete transported from a concrete plant to a site by an agitator truck; a slump measuring device for measuring the slump of the concrete at the time of acceptance; a temperature measuring device for measuring the temperature of the concrete; and a display device for displaying quality information of the concrete as it is pumped. The control device comprises a calculation unit that calculates the slump of the concrete in the pipe using (a) the slump of the concrete at the time of acceptance, (b) a first time indicating the time elapsed since production at the concrete plant, (c) a second time indicating the time from production at the concrete plant to unloading, and (d) the temperature of the concrete measured by the temperature measuring device; and a display control unit that displays the calculated slump in the pipe on the display device.

[0007] The present invention also provides a management device for managing the quality of concrete transported from a concrete plant to a site by an agitator truck, the management device comprising: a calculation unit that calculates the slump of the concrete in the pipe using (a) the slump of the concrete at the time of receipt measured by a slump measuring device, (b) a first time indicating the time elapsed since production at the concrete plant, (c) a second time indicating the time from production at the concrete plant to unloading, and (d) the temperature of the concrete measured by a temperature measuring device; and a display control unit that displays the calculated slump in the pipe on a display device that displays quality information of the concrete being pumped.

[0008] The present invention also provides a program for causing a computer of a management device that manages the quality of concrete transported from a concrete plant to a construction site by an agitator truck to function as a calculation unit that calculates the slump of the concrete in the pipe using (a) the slump of the concrete at the time of receipt measured by a slump measuring device, (b) a first time indicating the time elapsed since production at the concrete plant, (c) a second time indicating the time from production at the concrete plant to unloading, and (d) the temperature of the concrete measured by a temperature measuring device, and a display control unit that displays the calculated slump in the pipe on a display device that displays quality information of the concrete being pumped.

[0009] The present invention also provides a quality control method for a management device that manages the quality of concrete transported from a concrete plant to a site by an agitator truck, the quality control method comprising: a calculation step of calculating the slump of the concrete in the pipe using (a) the slump at the time of receipt of the concrete measured by a slump measuring device, (b) a first time indicating the time elapsed since production at the concrete plant, (c) a second time indicating the time from production at the concrete plant to unloading, and (d) the temperature of the concrete measured by a temperature measuring device; and a display control step of displaying the calculated slump in the pipe on a display device that displays quality information of the concrete being pumped.

[0010] This configuration allows the change in slump over time of the concrete being pumped to be tracked. The management device stores and uses the correlation information, allowing the management device to determine the slump at the tip of the concrete tube. Furthermore, because the system can reveal slump inside the pipe, which is difficult to observe, workers can easily take measures to prevent concrete blockages.

[0011] In addition, in the quality control system, it is preferable that the management device further includes a position identification unit that identifies the position of the concrete within the pipe using the length of the pipe, the diameter of the pipe, and the second time. It is also preferable that the management device further comprises a position identifying unit that identifies the position of the concrete within the pipe using the length of the pipe, the diameter of the pipe, and the second time period. With this configuration, the slump in the pipe can be calculated for each position in the pipe.

[0012] In the quality control system, it is preferable that the calculation unit calculates the slump in the pipe using a pumping pressure. In the management device, it is preferable that the calculation unit calculates the slump in the pipe using a pumping pressure. In the quality control method, it is preferable that the calculation step calculates the slump in the pipe using a pumping pressure. According to this configuration, the accuracy of calculation of the slump in the pipe can be improved. [Effects of the Invention]

[0013] According to the present invention, it is possible to assist in preventing blockage of pumped concrete. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a functional configuration diagram of a quality control system according to an embodiment of the present invention. [Figure 2] This is an example of a screen displaying the calculation results of the slump of concrete in a pipe. [Figure 3] 10 is a flowchart showing a process of the management device. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Each drawing is merely a schematic illustration to allow a sufficient understanding of the present invention. Therefore, the present invention is not limited to the illustrated examples. In each drawing, common or similar components are designated by the same reference numerals, and redundant explanations thereof will be omitted.

[0016] [composition] FIG. 1 is a functional configuration diagram of a quality control system according to this embodiment. Concrete (ready-mixed concrete) produced in a plant 2 (concrete plant) is transported while being agitated in a drum 31 by an agitator truck 3. When the agitator truck 3 arrives at the site, it causes the concrete in the drum 31 to flow down (receive) through a chute 32. A hopper 41 of a pump truck 4 is disposed below the downstream portion of the chute 32 and stores (unloads) the concrete that flows down from the chute 32. Thereafter, when the concrete in the hopper 41 reaches the entrance of a pipe 42, the pump truck 4 pumps the concrete in the pipe 42. The concrete that flows out from the nozzle of the pipe 42 is poured into a predetermined position on the site.

[0017] The quality control system 100 is a system that controls the quality of concrete manufactured in a plant 2 and poured at a construction site. The quality control system 100 includes at least a control device 1, a temperature measuring device 7, a display device 6, and a slump measuring device 5. The quality control system 100 also preferably includes a computer (not shown) installed in the plant 2. For convenience, information processing executed by the computer installed in the plant 2 may be acquired as information processing executed by the plant 2. The quality control system 100 also preferably includes a pump vehicle 4 that functions as an IoT device. The control device 1, the plant 2, the agitator truck 3, the pump vehicle 4, the temperature measuring device 7, the display device 6, and the slump measuring device 5 are connected to each other so as to be able to communicate with each other via a network (e.g., the Internet).

[0018] The management device 1 includes hardware such as an input unit, an output unit, a control unit, and a storage unit. For example, if the control unit is configured with a CPU (Central Processing Unit), information processing by a computer including the control unit is realized by program execution processing by the CPU. Furthermore, the storage unit included in the computer stores various programs for realizing the functions of the computer in response to instructions from the CPU. This allows software and hardware to work together. The programs can be provided by recording them on a recording medium or via a network. Furthermore, the storage unit may be implemented as a cloud.

[0019] The management device 1 manages the quality of concrete transported from a plant 2 to a construction site by an agitator truck 3. The management device 1 includes a calculation unit 11, a display control unit 12, and a position identification unit 13. The management device 1 also stores correlation information 14, piping information 15, and pressure information 16.

[0020] The calculation unit 11 calculates the slump of the concrete in the pipe 42. The calculation method of the calculation unit 11 will be described later. The display control unit 12 causes the display device 6 to display the calculated slump in the pipe. The position specifying unit 13 specifies the position of the concrete in the pipe 42. The specifying method of the position specifying unit 13 will be described later.

[0021] The correlation information 14 is information indicating the correlation between the slump value of the concrete at the time of receipt, a second time indicating the time from production at the concrete plant to unloading, the temperature of the concrete, and the slump of the concrete at the time (first time) that has elapsed since production at plant 2. The calculation unit 11 can calculate the slump of the concrete while it is being pumped by referring to the correlation information 14. The piping information 15 is information about the piping 42. For example, the piping information 15 includes information about the shape, length, and diameter of the piping 42. The shape of the piping 42 can include, but is not limited to, the positions of the bent pipes, tapered pipes, and joints used in the piping 42. The piping 42 may be a boom as shown in FIG. 1, but may also be a fixed piping that is directly connected to the hopper 41 of the pump vehicle 4 and that pumps the fluid over a long distance in a fixed manner (without using flexible materials). The piping information 15 can also be configured for such piping. The pressure information 16 is information indicating, for example, the pumping pressure of the pump vehicle 4 (for example, the hydraulic pressure of the piston).

[0022] The temperature measuring device 7 is a device that measures the temperature of the concrete. For example, a non-contact radiation thermometer can be used as the temperature measuring device 7. When measuring the temperature of the concrete when it is received, it is advisable to point a radiation thermometer attached to scaffolding or the like set up on the site at the concrete flowing down the chute 32 of the agitator truck 3. Furthermore, instead of a radiation thermometer, a tablet terminal with a temperature measuring function may also be used.

[0023] Furthermore, the temperature measuring device 7 may be of a contact type rather than a non-contact type. Specifically, it may be a liquid thermometer, a thermocouple, a resistance thermometer, or a bimetal thermometer. For example, a thermocouple may be attached inside the hopper 41 of the pump vehicle 4 to measure the temperature of the concrete stored in the hopper 41 (in this case, the temperature of the concrete when it is unloaded will be measured). The location where the temperature measuring device 7 measures the temperature of the concrete may be changed as appropriate. The display device 6 displays the calculated slump in the pipe in accordance with the display control unit 12. For example, the display device 6 may be a tablet terminal or a display, but is not limited to these. The slump measuring device 5 is a device that measures the slump of concrete when it is received. For example, the slump measuring device 5 can be implemented as a camera (e.g., an internet camera) described in Japanese Patent No. 7153619.

[0024] (Getting correlation information) The correlation information 14 is information that can be acquired by a prior confirmation test, and the management device 1 can store the acquired correlation information 14. The confirmation test involves, for example, preparing multiple types of concrete with different slumps at the time of arrival at the site, and examining the change in the slump of each concrete over time. Well-known test methods can be used, and detailed explanations will be omitted. Generally, there is a correlation in which the slump of concrete decreases as the time elapsed since arrival at the site increases. This correlation can be confirmed regardless of the size of the slump at the time of arrival at the site.

[0025] Furthermore, the correlation information 14 can be information that takes into account the temperature of the concrete. In a preliminary confirmation test, several types of concrete that have the same slump at the time of arrival at the site but different temperatures can be prepared, and the change in the slump of each type of concrete over time can be examined. Generally, the higher the temperature of the concrete, the faster the rate at which the slump of the concrete decreases (the more likely the fluidity of the concrete is to decrease). The effect of concrete temperature on the change in slump over time can be taken into account as the accumulated temperature over time.

[0026] (Slump and temperature of concrete at time of acceptance) For example, the slump measuring device 5 can determine the slump of the concrete at the time of acceptance by using the cross-sectional area of ​​the concrete perpendicular to the flow direction of the concrete flowing down the chute and the flow rate of the concrete (see Japanese Patent No. 7153619). Alternatively, the slump of the concrete at the time of acceptance may be obtained by having a measurer take a sample of the concrete flowing down the chute 32 of the agitator truck 3 that has arrived at the site and measure the slump. The method for measuring the slump in this case is well known, and therefore a description thereof will be omitted. Furthermore, as already explained, the temperature of the concrete when it is received can be measured by, for example, using a radiation thermometer attached at a high position on scaffolding set up on the site, directed toward the concrete flowing down the chute 32 of the agitator truck 3. Other methods may also be used.

[0027] (Identifying the location of concrete in pipes) At the time of unloading, some of the concrete in the hopper 41 of the pump truck 4 has reached the entrance of the pipe 42. The hopper 41 can pump the concrete into the pipe 42 at a predetermined pressure. The speed at which the concrete moves through the pipe 42 is determined by the length and diameter of the pipe 42, which are included in the pipe information 15. The time that has passed since unloading can be obtained by subtracting the time that has passed since production at plant 2 until unloading (second time) from the time that has passed since production at plant 2 (first time), and this time is the intra-pipe travel time that the concrete takes to move through the pipe 42.

[0028] The management device 1 can obtain, for example, the time when concrete was produced in the plant 2 from a computer installed in the plant 2. Thus, the management device 1 can obtain the time that has passed since the time of production in the plant 2. The management device 1 can also obtain, for example, the time when the concrete was unloaded from the pump truck 4. Thus, the management device 1 can obtain the time from the time of production in the plant 2 to the time when the concrete was unloaded. The management device 1 can also obtain, for example, the time when the concrete was received from the agitator truck 3 or the slump measuring device 5.

[0029] Since the concrete moves inside the pipe 42 towards the nozzle, the time it takes to move inside the pipe can be converted into the position of the concrete moving inside the pipe 42. Therefore, the position identifying unit 13 can identify the position of the concrete inside the pipe 42. More specifically, the position identifying unit 13 can identify the position of the concrete inside the pipe 42 using the length of the pipe 42, the diameter of the pipe 42, and the time (second time) from the time of production at the plant 2 to the time of unloading.

[0030] For example, by allocating positions at predetermined intervals along the extension direction of the pipe 42, the position identifying unit 13 can use the in-pipe travel time to identify the position of the concrete in the pipe 42 for each allocated position of the pipe 42. It can also identify how much time has passed since the concrete was manufactured in the plant 2 after it passed through an allocated position.

[0031] (Acquisition of pumping pressure) The management device 1 can acquire the pumping pressure (hydraulic pressure) of the pump vehicle 4 in real time from cloud data received from the pump vehicle 4 as an IoT device. The management device 1 can convert the acquired pumping pressure into the front pressure that the concrete in the pipe 42 receives, for example, using Equation 1. Front pressure on concrete = ((Hydraulic pressure - steady pressure) / Piston cross-sectional area) × Internal loss coefficient ...Formula 1 Here, for example, the internal loss coefficient can be set to, but is not limited to, 0.7. The pressure information 16 may include not only the pumping pressure (hydraulic pressure) of the pump vehicle 4 but also the converted front pressure.

[0032] The pumping pressure (hydraulic pressure) of the pump vehicle 4 may be obtained, for example, by an automatic reading from a hydraulic pressure gauge provided in the pump vehicle 4. Alternatively, the pressure may be read directly from a pressure gauge attached to the piping 42.

[0033] (Calculation of concrete slump in pipes) The calculation unit 11 can calculate the slump of the concrete in the pipe 42 using Equation 2. Sm = SL + {(0.26 × (tm - tL) 2 - 5.2 × (tm - tL)} × (T + 10) / 30 ...Formula 2 Here, Sm is the slump of the concrete in the pipe 42, SL is the slump of the concrete at the time of receipt, tm is the time (first time) elapsed since production at the plant 2, tL is the time (second time) from production at the plant 2 to unloading, and T is the temperature of the concrete at the time of receipt. tm - tL represents the travel time within the pipe (the time elapsed since unloading). The coefficients and operators in Equation 2 can be determined appropriately using the correlation information 14. The calculation unit 11 can calculate the slump Sm of the concrete traveling within the pipe 42 for each position in the pipe 42 using Equation 1. Furthermore, by using the positions identified by the position identification unit 13, Equation 2 can calculate the slump Sm due to the length and diameter of the pipe 42.

[0034] Equation 2 is a calculation formula for slump Sm that takes into account the influence of time and is therefore a calculation formula that is not affected by pumping pressure. It is also possible to calculate slump Sm by taking into account the influence of pumping pressure. For example, the calculation formula can be modified to appropriately incorporate the pumping pressure into Equation 1. Alternatively, a method can be used to reduce slump according to the maximum pressure experienced within the pipe 42 (see Japanese Patent No. 7221128). Furthermore, an invention that determines the pumping distance of concrete can also be applied (see Japanese Patent No. 6909708). Furthermore, when the pipe length is short or the pumping pressure is low (e.g., when pumping using a boom), the influence of pressure can be ignored. Previous knowledge, such as the fact that slump decreases by 1 cm per 100 m of horizontal equivalent length of pipe, can also be incorporated.

[0035] (Visualization of concrete slump inside pipes) FIG. 2 is an example of a screen displaying the calculation results of the slump of concrete in a pipe. Under the control of the display control unit 12, the display device 6 can display the slump calculated by the calculation unit 11 using Equation 1 as the example screen of FIG. 2. In FIG. 2, the pipe 42 is represented by horizontally arranged rectangles 61 from the base side connected to the hopper 41 (shown as "hopper" in FIG. 2) to the nozzle side (shown as "nozzle" in FIG. 2). The boundaries between adjacent rectangles 61 indicate the allocation positions of the pipe 42 by the position identification unit 13. Each of the rectangles 61 corresponds to a position in the extension direction of the pipe 42.

[0036] The display device 6 can display the slump (unit: cm) calculated by the calculation unit 11 above each of the rectangles 61. The displayed slump indicates the slump of the concrete present at the position in the extension direction of the pipe 42 corresponding to each of the rectangles 61. Furthermore, the display device 6 can color-display the rectangle 61 corresponding to the position in the extension direction of the pipe 42 according to the slump calculated by the calculation unit 11. For example, the smaller the slump, the darker the color of the rectangle 61 can be, but the display format is not limited to this.

[0037] [process] The process of quality control of concrete according to this embodiment will be described. Fig. 3 is a flowchart showing the process of the control device. The control device 1 starts the process of Fig. 3 for each piece of concrete transported from the plant 2 to the site by the agitator truck 3. The pumping speed of the concrete in the pipes 42 is set in advance by adjusting the pump truck 4. First, the control device 1 acquires the slump at the time of receiving the concrete, the temperature at the time of receiving the concrete, the time elapsed since production at the plant 2, and the time from production at the plant 2 to unloading (step S1).

[0038] Next, the calculation unit 11 of the management device 1 calculates the slump of the concrete in the pipe 42 using Equation 2 (step S2). At this time, the position identification unit 13 can identify the position of the concrete in the pipe 42 using the pipe information 15. The slump calculation can be performed for each position in the pipe 42 identified by the position identification unit 13. In other words, the slump can be calculated for all the concrete moving in the pipe 42. The calculation unit 11 may also calculate the slump using the pressure information 16.

[0039] Next, the display control unit 12 of the management device 1 causes the display device 6 to display the slump of the concrete in the pipe 42 (step S3). The display device 6 can display the slump for all concrete moving in the pipe 42. This completes the processing of FIG. 3. The processing of FIG. 3 can be executed repeatedly in real time. As a result, the slump in the pipe 42 can be calculated and displayed for all concrete transported by the agitator truck 3.

[0040] [effect] According to this embodiment, it is possible to track the change in slump over time for concrete being pumped. By storing and using the correlation information 14, the management device 1 can determine the slump at the tip of the concrete tube. Furthermore, since it can make slump inside the pipe, which is difficult to observe, visible, workers can easily take measures to avoid concrete blockage. In this way, the management device 1 can support the prevention of blockage of the concrete being pumped.

[0041] Due to various circumstances, the slump of concrete transported to a construction site by an agitator truck may be smaller than normal. Conventionally, concrete with a low slump may be pumped in the same way as concrete with a normal slump, without noticing these circumstances. This has resulted in the inconvenience of the concrete in the pipes being unable to be pumped over time, resulting in blockages. According to this embodiment, the slump of the concrete before pumping is acquired on-site for each agitator truck, and changes in slump during pumping can be tracked and visualized, taking into account the influence of temperature. Therefore, the possibility of blockage can be easily predicted without noticing the above-mentioned circumstances, and measures to avoid blockages can be taken quickly.

[0042] In on-site construction, concrete from multiple agitator trucks is usually pumped through the same pressure pipe. For this reason, in the past, if a blockage occurred, it was difficult to track the agitator truck that transported the blocked concrete. According to this embodiment, the slump of the transported concrete can be managed for each agitator truck, and therefore the agitator truck that transported the concrete under management can also be managed. As a result, even if a blockage occurs, it becomes easy to track the agitator truck that transported the blocked concrete, making it easier to review the concrete transportation system.

[0043] Furthermore, according to this embodiment, the slump in the pipe 42 can be calculated for each position in the pipe 42. This makes it possible to track the change in slump over time for all pumped concrete. Furthermore, by using pumping pressure information, the accuracy of calculation of the slump in the pipe 42 can be improved.

[0044] [others] (a) This embodiment examines the change in slump (cm) over time, but it is also possible to examine the change in slump flow (mm) over time. (b): When acquiring the correlation information 14, concrete mix information may be used. For example, in a preliminary confirmation test, multiple types of concrete with the same slump but different mix proportions may be prepared, and the change in the slump of each concrete over time may be examined. The mix proportion indicated by the mix proportion information may be, for example, the size and content of coarse aggregate, the size and content of fine aggregate, the air content, the water-cement ratio, the type and content of AE agent, and the type and content of AE damping agent, but is not limited to these. (c): The slump of the concrete when poured may be measured and the calculated slump of the concrete in the pipe 42 may be corrected. If the slump of the concrete when poured differs from the plan, it is likely that the pumping speed differs from the plan. In this case, the actual pumping speed should be calculated from the pouring records and the position of the concrete in the pipe 42 should be corrected. (d): The piping information 15 may include information about the shape of the pipe 42. In this case, the slump of the concrete in the pipe 42 can be calculated based on the shape of the pipe. For example, if a vent pipe is used in the middle of the pipe 42 or if a tapered pipe is used at the end of the pipe 42, the slump will drop significantly at the bent portion or the end of the pipe. Therefore, by modifying Equation 2 to take into account the shape of the pipe 42, the slump for each position on the pipe 42 can be calculated more accurately. (e): The coefficients and operators in Equation 2 can be changed as appropriate in accordance with the contents of the correlation information 14. In addition, the coefficients in Equation 2 can be used as variables, and an algorithm can be prepared that can obtain values ​​to be substituted for the variables from the correlation information 14, thereby automatically calculating the slump Sm of the concrete in the pipe 42. For example, Equation 2 can be changed to: Sm = SL + {(A × (tm - tL) 2 - B × (tm - tL)} × (T + 10) / 30 ...Formula 3 A and B are constants obtained by experiments on the concrete being used (in Equation 2, A = 0.26, B = 5.2). Furthermore, the expression of slump Sm is not limited to a quadratic expression or an nth-order polynomial, and other functional expressions such as a periodic function, exponential function, or logarithmic function can also be used.

[0045] (f): It is also possible to realize a technology that appropriately combines the various technologies described in this embodiment. (g) The software described in this embodiment can be realized as hardware, and vice versa. (h) In addition, the components of the present invention may be modified as appropriate within the scope of the invention. [Explanation of symbols]

[0046] 100 Quality Control System 1 Management device 11 Calculation section 12 Display control unit 13 Location identification part 14 Correlation Information 15 Piping Information 16 Pressure Information 2 Plant (concrete plant) 3 Agitator Truck 31 Drums 32 shots 4. Pump truck 41 Hopper 42 Piping 5. Slump measuring device 6 Display device 7 Temperature measuring device

Claims

1. A quality control system comprising: a control device for controlling the quality of concrete transported from a concrete plant to a site by an agitator truck; a slump measuring device for measuring the slump of the concrete at the time of receiving the concrete; a temperature measuring device for measuring the temperature of the concrete; and a display device for displaying quality information of the concrete being pumped; The management device a calculation unit that calculates the slump of the concrete in the pipe using (a) the slump of the concrete at the time of receipt, (b) a first time indicating the time elapsed since production at the concrete plant, (c) a second time indicating the time from production at the concrete plant to unloading, and (d) the temperature of the concrete measured by the temperature measuring device; a display control unit that displays the calculated slump in the pipe on the display device.

2. The management device The quality control system according to claim 1 , further comprising: a position identifying unit that identifies a position of the concrete within the pipe using the length of the pipe, the diameter of the pipe, and the second time period.

3. The quality control system according to claim 1 or 2, wherein the calculation unit calculates the slump in the pipe using a pumping pressure.

4. A control device for controlling the quality of concrete transported from a concrete plant to a site by an agitator truck, a calculation unit that calculates the slump of the concrete in the pipe using (a) the slump of the concrete at the time of receipt measured by a slump measuring device, (b) a first time indicating the time elapsed since production at the concrete plant, (c) a second time indicating the time from production at the concrete plant to unloading, and (d) the temperature of the concrete measured by a temperature measuring device; A management device comprising: a display control unit that displays the calculated slump in the pipe on a display device that displays quality information of the concrete being pumped.

5. The management device according to claim 4 , further comprising: a position identification unit that identifies a position of the concrete in the pipe using the length of the pipe, the diameter of the pipe, and the second time period.

6. The management device according to claim 4 or 5, wherein the calculation unit calculates the slump in the pipe using a pumping pressure.

7. The computer in the control device that manages the quality of concrete transported from the concrete plant to the site by agitator truck, a calculation unit that calculates the slump of the concrete in the pipe using (a) the slump of the concrete at the time of receipt measured by a slump measuring device, (b) a first time indicating the time elapsed since production at the concrete plant, (c) a second time indicating the time from production at the concrete plant to unloading, and (d) the temperature of the concrete measured by a temperature measuring device; A program for functioning as a display control unit that displays the calculated slump in the pipe on a display device that displays quality information of the concrete being pumped.

8. A quality control method in a control device that controls the quality of concrete transported from a concrete plant to a site by an agitator truck, comprising: A calculation step of calculating the slump of the concrete in the pipe using (a) the slump of the concrete at the time of receipt measured by a slump measuring device, (b) a first time indicating the time elapsed since production at the concrete plant, (c) a second time indicating the time from production at the concrete plant to unloading, and (d) the temperature of the concrete measured by a temperature measuring device; A quality control method comprising: a display control step of displaying the calculated slump in the pipe on a display device that displays quality information of the concrete being pumped.

9. The quality control method according to claim 8 , wherein the calculation step calculates the slump in the piping using a pumping pressure.

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