JP2023116193A - Fluidity measuring method, fluidity measuring device, and fluidity measuring system - Google Patents

Abstract

An object of the present invention is to easily measure the fluidity of a substance while reducing labor.
Kind Code: A1 In this fluidity measuring method, a sensor 20 is installed inside a rotatable container 12 installed in a facility so as to rotate with the rotation of the container 12, and a substance M is placed in the container 12. is introduced, the container 12 is rotated to pass the sensor 20 into the substance M, the pressure received from the substance M at that time is measured by the sensor 20, and based on the pressure measured by the sensor 20, the substance M Calculate liquidity. As a result, the fluidity of the substance M can be calculated without the need to take the substance M in and out of the container 12, and, if necessary, the fluidity of the substance M can be calculated continuously while the container 12 is continuously rotated. can be grasped. Therefore, labor can be greatly reduced, and the fluidity of the substance M can be easily measured while working efficiency is improved.
[Selection drawing] Fig. 2

Description

There is an application for the application of Article 30, Paragraph 2 of the Patent Act.

TECHNICAL FIELD The present invention relates to a fluidity measuring method, a fluidity measuring device, and a fluidity measuring system for measuring the fluidity of a substance for various purposes.

In a substance test conducted at a research facility, such as a fresh concrete kneading test, first, a small mixer with a capacity of about 50 to 100 liters is used to knead fresh concrete to make a sample, which is temporarily placed in a container. Transfer and perform the necessary tests. Assuming actual construction work using concrete, a change test of fresh concrete over time is often carried out in consideration of the transportation time from the fresh concrete manufacturing facility to the construction site and the placement of concrete. For example, a sample of fresh concrete is stored as it is in a container, and a slump test or a slump flow test (see Patent Document 1) is performed on the sample every 30 minutes from kneading to 120 minutes. Alternatively, put the sample in the container into a tilting mixer that looks like a drum of an agitator truck that transports fresh concrete, store it at low speed rotation, transfer it to a container, perform a slump test or a slump flow test, and transfer it to the tilting mixer. is re-inserted every 30 minutes.

On the other hand, in the construction in which concrete is poured, a simulation of the flow condition of concrete is performed prior to the construction. In such simulations, the specific structure (formwork) of the structure to be filled with fresh concrete at the construction site is taken into consideration, and the flow of concrete into the formwork is grasped. Concrete viscosity is required. For this purpose, when measuring the viscosity of fresh concrete, a rotary blade viscometer is often used to measure the apparent viscosity. In this method, a fresh concrete sample is packed in a container of about 10 liters, a rotating blade of a viscometer is inserted therein, and the rotating blade is rotated at each rotation speed to measure the torque.

Japanese Patent No. 4981984

Here, in the concrete mixing test, the time-dependent change test of fresh concrete is performed as described above, but if the number of slump tests and slump flow tests is increased as necessary, a large amount of labor is required accordingly. Become. That is, the interval of 30 minutes as described above is not necessarily sufficient to capture fluctuations in the slump value and the slump flow value of fresh concrete. Considering that, it was not realistic from the viewpoint of labor. In particular, in a test using a tilting mixer, a huge amount of labor is required because the entire amount of the sample is discharged from the tilting mixer, tested, and re-inserted into the tilting mixer.

Furthermore, when measuring the viscosity of fresh concrete using a rotor blade viscometer, the sample itself rotates with the rotor blade due to the shape of the rotor blade, and the coarse aggregate in the sample is found to be uneven. , it was difficult to measure the apparent viscosity. For this reason, it was difficult to accurately simulate the flow of concrete, etc., and it was difficult to adjust the flowability suitable for pouring at the construction site and to grasp the mixing ratio of the concrete constituent materials for that purpose. In addition, fluidity such as slump value, slump flow value, and apparent viscosity of fresh concrete is not only necessary for understanding the appropriate mixing ratio of concrete constituent materials, but also for developing and selecting concrete products, and developing constituent materials such as admixtures. , is used for various purposes, it is desirable to be easily measured.
The present invention has been made in view of the above problems, and an object of the present invention is to easily measure the fluidity of a substance while reducing labor.

(Mode of invention)
The following aspects of the invention exemplify configurations of the present invention, and will be described separately in order to facilitate understanding of the various configurations of the present invention. Each term does not limit the technical scope of the present invention, and while considering the best mode for carrying out the invention, replaces, deletes, or further The technical scope of the present invention can also include the addition of the constituent elements.

(1) A method for measuring the fluidity of a substance, comprising installing a sensor inside a rotatable container installed in a facility so as to rotate as the container rotates, and The substance is introduced, the container is rotated to pass the sensor through the substance, the pressure received from the substance at that time is measured by the sensor, and the pressure measured by the sensor is used to determine the Fluidity measurement method for calculating the fluidity of a substance.

The fluidity measurement method described in this section measures the fluidity of a substance. Install the sensor. At this time, the sensor is fixed so that it rotates inside the container as the container rotates. Next, the substance to be measured is put into the container in which the sensor is installed, and the container is rotated in this state, thereby stirring the substance in the container and rotating the sensor. Then, since the sensor passes through the material and comes into contact with the material, the sensor measures the pressure received from the material at that time.

Since the pressure measured as described above serves as an index indicating the fluidity of the substance, the fluidity of the substance is calculated based on the pressure measured by the sensor. Thereby, the fluidity of the substance can be calculated without the need to take the substance in and out of the container, and furthermore, the fluidity of the substance can be grasped continuously while continuously rotating the container as necessary. For this reason, the labor is greatly reduced, the working efficiency is improved, and the fluidity of the substance can be easily measured. In addition, the amount of the substance to be measured and the size of the container need only be able to measure the pressure with the sensor used. will be used.

(2) A fluidity measuring method in the above item (1), wherein the fluidity of fresh concrete is calculated as the substance.
In the fluidity measuring method described in this section, the substance to be measured is fresh concrete, and the fluidity of the fresh concrete is calculated as described in (1) above. By measuring the fluidity of fresh concrete in this way, it is possible to grasp the appropriate mixing ratio of the concrete constituent materials according to the construction site, select the concrete to be used at the construction site, develop concrete products, and determine the concrete material. It will be used for various purposes such as development and admixture development. Furthermore, if the fluidity of the fresh concrete to be used at the construction site is grasped as described above, and a concrete pump vehicle with a corresponding capacity is used at the construction site, the fluidity of the fresh concrete is not grasped. Compared to the case of using a concrete pump truck with excessive capacity for the construction, it contributes to the reduction of costs and the reduction of carbon dioxide emissions, and is environmentally friendly. In addition, by understanding the fluidity of fresh concrete, it is expected to omit demonstration experiments such as pouring fresh concrete into a formwork that imitates it, especially when the shape of the formwork at the construction site is complicated. is.

(3) In the items (1) and (2) above, the container is rotated at a constant speed, and the pressure received by the sensor from the substance at that time, and the previously grasped pressure and the slump actual measurement value of the substance. Or a fluidity measuring method for calculating the slump estimated value or the slump flow estimated value of the substance based on the relationship with the slump flow measured value.
The fluidity measurement method described in this section is to grasp in advance the relationship between the pressure received by the sensor from the substance when the container is rotated at a constant speed and the actual slump value or the actual slump flow value of the substance at that time. do. That is, both the pressure measurement of the substance when it is rotated at a constant speed in the container, and the slump test and slump flow test using the substance as a sample are repeatedly performed, and the results are used to make the above Understand relationships. When measuring a substance, the container is rotated at a constant speed, and the pressure received by the sensor from the substance in the container at that time, the pressure obtained as described above, and the measured slump value or measured slump flow value of the substance. A slump estimate or slump flow estimate for the material is calculated based on the relationship. This makes it possible to continuously and easily measure the slump of the substance and the temporal change of the slump flow while reducing the work effort.

(4) In items (1) and (2) above, the container is rotated at at least two constant speeds, and the pressure received by the sensor from the substance during one constant speed and the pressure received by the substance during the other constant speed A fluidity measuring method for calculating an apparent plastic viscosity and an apparent yield value of the substance using the method of least squares based on the pressure received by the sensor from the substance.
The flowability measurement method described in this section rotates the container at at least two constant velocities, wherein the pressure received by the sensor from the material during one constant velocity and the pressure received by the sensor from the material during the other constant velocity. Measure the applied pressure. Furthermore, based on one constant speed and pressure at that time, and the other constant speed and pressure at that time, using the least squares method, the relational expression between the rotational speed of the container and the pressure received from the substance is calculated. , the pressure is derived by expressing it as a linear equation of the rotation speed. Then, the slope of the linear equation is calculated as the apparent plastic viscosity of the substance, and the intercept of the pressure is calculated as the apparent yield value of the substance. As a result, the apparent plastic viscosity and apparent yield value of a substance can be easily measured with reduced labor.

(5) A fluidity measuring method according to items (1) to (4) above, wherein a tilting mixer is used as the container, and the sensor is repeatedly moved in and out of the substance when the tilting mixer is rotated.
The fluidity measuring method described in this section uses a tilting mixer as a container in which a sensor is installed and a substance is introduced. Then, the sensor is attached at a position such that the sensor repeatedly enters and exits the substance in the tilting mixer when the tilting mixer is rotated. As a result, the substance is efficiently stirred by the tilting mixer, and the pressure from the substance is efficiently measured by the sensor. Furthermore, since the shape of the tilting drum mixer resembles that of the drum of the agitator vehicle, it is particularly useful when measuring the fluidity of fresh concrete as a substance, to grasp the temporal change of the fluidity of fresh concrete in the agitator vehicle. is expected.

(6) A device for measuring the fluidity of a substance, which is installed in a facility and contains a container into which the substance is put, a rotation mechanism for rotating the container at a variable rotation speed, and a sensor that measures the pressure when the substance comes into contact with the substance, and the sensor is rotated inside the container as the container rotates, and is positioned so as to pass through the substance put into the container. A fluidity measuring device, comprising: an attachment part for attachment; and a calculation part for calculating the fluidity of the substance based on the pressure measured by the sensor during rotation of the container.
The fluidity measuring device described in this section includes a container in which the substance to be measured is put, a rotation mechanism for rotating the container, a sensor for measuring the pressure when the substance comes into contact, and a sensor inside the container. It includes an attachment part for attachment and a calculation part for calculating the fluidity of the substance based on the measurement result of the sensor. Such a specific configuration capable of realizing the fluidity measuring method of the above item (1) has the same effect as the fluidity measuring method of the above item (1).

(7) A fluidity measuring device according to the above item (6), which calculates the fluidity of fresh concrete as the substance.
(8) In items (6) and (7) above, the calculation unit is preset with the pressure received by the sensor from the substance when the container is rotated at a constant speed by the rotation mechanism. A fluidity measuring device for calculating an estimated slump value or an estimated slump flow value of the substance based on the relationship between the pressure and the measured slump value or the measured slump flow value of the substance.
(9) In items (6) and (7) above, when the container is rotated at at least two constant speeds by the rotating mechanism, the calculator detects the sensor from the substance at one of the constant speeds. Calculate the apparent plastic viscosity and apparent yield value of the material using the least squares method based on the pressure received and the pressure received by the sensor from the material during constant velocity on the other hand. sexuality measuring device.

(10) In items (6) to (9) above, the container is a tilting mixer, and the mounting portion is adapted to move the substance in the tilting mixer when the tilting mixer is rotated. A fluidity measuring device in which the sensor is attached at a position where the sensor repeatedly enters and exits.
The fluidity measuring devices described in items (7) to (10) each have a specific configuration used in the fluidity measuring method described in items (2) to (5) above, and This has the same effect as the fluidity measuring method of item (5).

(11) The fluidity measuring device according to any one of (6) to (10) above, a display unit for displaying a plurality of data including the calculation results of the calculation unit, and a display unit for displaying the plurality of data a data storage unit for storing data; and a communication unit for transmitting and receiving data between the sensor and the calculation unit and between the calculation unit and the data storage unit. system.
The fluidity measuring system described in this section includes a display unit, a data storage unit, and a communication unit in addition to the fluidity measuring device as shown in the above items (6) to (10). The display unit displays a plurality of data including calculation results by the calculation unit of the fluidity measuring device, and the data storage unit stores such a plurality of data. The communication unit communicably connects the sensor and the calculation unit of the fluidity measuring device, and also communicably connects the calculation unit and the data storage unit. With such a configuration, confirmation of various data through the display unit, storage of data through the data storage unit and confirmation of the stored data, transmission and reception of data through the communication unit, and the like can be performed smoothly. Therefore, the operator can efficiently proceed with the measurement work, and the stored various data can be used for various purposes.

Since the present invention is configured as described above, it becomes possible to easily measure the fluidity of a substance while reducing labor.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows an example of a structure of the fluidity measuring device and fluidity measuring system which concern on embodiment of this invention. 1. It is a side image view of the tilting mixer which makes the container of the fluidity measuring apparatus of FIG. FIG. 3 is a perspective view showing the inside of the tilting mixer of FIG. 2; It is a flow figure showing an example of the procedure of the fluidity measuring method concerning an embodiment of the invention. It is an example of a graph used to calculate a slump estimated value. It is an image graph of a calculation formula used for calculation of apparent plastic viscosity and apparent yield value.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described based on the accompanying drawings. Here, detailed description of the same or corresponding parts as in the prior art is omitted, and the same or corresponding parts are indicated by the same reference numerals throughout the drawings.
FIG. 1 shows the configuration of a fluidity measuring device 10 according to an embodiment of the present invention and a fluidity measuring system 40 comprising this fluidity measuring device 10 according to an embodiment of the present invention. The configurations of the fluidity measuring device 10 and the fluidity measuring system 40 are not limited to the block diagram of FIG. 1, and some of the components shown in FIG. The configuration may be deleted, changed, or added as appropriate.

The fluidity measuring device 10 measures the fluidity of a substance M (see FIG. 2) such as fresh concrete and soil used at construction sites and civil engineering sites, and as shown in FIG. 12 , a rotating mechanism 18 , a sensor 20 , a mounting portion 30 and a calculating portion 32 . The container 12 is rotatable under the control of the rotating mechanism 18, and stirs the substance M by rotating with the substance M put therein. Any vessel installed in a research facility or a manufacturing facility may be used as the container 12, but in this embodiment, for example, a tilting mixer 12A as shown in FIGS. 2 and 3 is used.

The size of the canting mixer 12A may range from a relatively small size used in laboratories to a relatively large size used in manufacturing plants, and is not particularly limited. In this embodiment, a relatively small tilting mixer 12A having a capacity of several tens of liters is used. As can be seen in FIG. 3, the tilting mixer 12A has a plurality of blades 14 inside, which enhances the efficiency of stirring the substance M. As shown in FIG. The rotating mechanism 18 rotates the container 12 (tilting mixer 12A), and in this embodiment, the rotating speed of the container 12 is variable by inverter control. For example, rotation mechanism 18 controls the rotation speed of container 12 in the range of 1 rpm to 20 rpm.

The sensor 20 measures the resistance pressure received when it comes into contact with the substance M or the like, and in this embodiment, a bar-shaped sensor 20 is used. The bar-shaped sensor 20 is mounted inside the container 12 (tilting mixer 12A) by means of a mounting portion 30 so as to rotate with the rotation of the container 12. At this time, as shown in FIGS. Second, the other end of the sensor 20 is fixed to the container 12 so that one end of the sensor 20 protrudes toward the center of the container 12 . More specifically, when the container 12 is rotated with the substance M put into the container 12, the sensor 20 is entirely submerged in the substance M as shown in FIG. is attached by the attachment portion 30 at a position such that at least a part of the is out of the material M is repeated.

Furthermore, as shown in FIG. 1, the sensor 20 of the present embodiment includes a measurement section 22, a data processing section 24, a power supply section 26, and a transmission section 62 forming part of a communication section 60, which will be described later. The measurement unit 22 measures physical deformation when the sensor 20 contacts the substance M and converts it into an electric signal, and is configured by, for example, a strain gauge. The data processing unit 24 receives the measurement result from the measurement unit 22 and outputs it as pressure data suitable for use in the calculation unit 32 and the like, which will be described later. The transmission unit 62 is for transmitting the output from the data processing unit 24 to the calculation unit 32, and the power supply unit 26 is for supplying power to the measurement unit 22, the data processing unit 24, and the transmission unit 62. belongs to.

For the bar-shaped sensor 20 configured as described above, for example, a probe sensor manufactured by Command Alkon, which is imported and sold by GNN Machinery Japan, is used. However, the sensor 20 of the fluidity measuring device 10 according to the embodiment of the present invention is not limited to the probe sensor described above, and may be any device capable of measuring the pressure when it comes into contact with the substance M or the like. That is, the sensor 20 may be of any shape and size that does not impede the flow of the substance M within the container 12 and receives resistance from the substance M. Also, the size and shape of the sensor 20 may be selected according to the size and shape of the container 12 in which it is installed.

The calculator 32 calculates the fluidity of the substance M based on the pressure measured by the sensor 20 when the sensor 20 comes into contact with the substance M in the rotated container 12 . Although details will be described later, the calculation unit 32 calculates, for example, a slump estimated value, a slump flow estimated value, an apparent plastic viscosity, an apparent yield value, etc. of the material M as the fluidity of the material M. The calculation unit 32 is configured by any combination of hardware and software, such as various computers such as notebook computers, tablet computers, and desktop computers, and software incorporated therein.

On the other hand, the fluidity measurement system 40 includes a display unit 50, a data storage unit 54, and a communication unit 60 in addition to the fluidity measurement device 10 configured as described above. The display unit 50 displays various data handled by the liquidity measurement system 40, such as the calculation result by the calculation unit 32, the measurement result by the sensor 20, and other data used for the calculation by the calculation unit 32, for example, the measurement work. It is intended to be displayed to others. Any display device may be used for the display unit 50, for example, a display of a computer that constitutes the calculation unit 32 may be used. The data storage unit 54 stores various data handled by the fluidity measurement system 40, such as the data displayed by the display unit 50 as described above, and may be composed of any storage device.

The communication unit 60 is for realizing data communication within the liquidity measurement system 40, and is at least between the sensor 20 and the calculation unit 32, and between the calculation unit 32 and the data storage unit 54. to enable data communication. For this reason, the communication unit 60 of the present embodiment is connected to the transmission unit 62 incorporated in the sensor 20 as described above and the calculation unit 32, receives data from the transmission unit 62, and stores the data in the data storage unit 54. and a receiving unit 66 for receiving the data transmitted from the transmitting/receiving unit 64 and transmitting it to the data storage unit 54 . The transmission unit 62 and the transmission/reception unit 64 are connected by a short-range wireless communication standard such as Wi-Fi (registered trademark) or Bluetooth (registered trademark), and the transmission/reception unit 64 and the reception unit 66 are connected by wire, It is connected by any communication standard such as wireless or internet line. Arbitrary communication equipment that can satisfy the standards of communication performed by each component is used for each component of the communication unit 60 . Note that the communication unit 60 may include additional components that enable access to the data stored in the data storage unit 54 from terminals such as various computers and smartphones operated by relevant parties. .

Subsequently, with reference to the flow diagram shown in FIG. 4, the specific procedure of the fluidity measuring method according to the embodiment of the present invention, which is executed using the fluidity measuring device 10 and the fluidity measuring system 40 described above. I will explain the flow of For configurations of the fluidity measuring device 10 and the fluidity measuring system 40, refer to FIGS. 1 to 3 as appropriate. The flow chart shown in FIG. 4 shows an example for explaining a specific procedure. Therefore, the fluidity measuring method according to the embodiment of the present invention is not limited to the flow chart of FIG. , a flow in which some of the steps shown in FIG. 4 are deleted, changed, or added as appropriate.

S10 (sensor installation): The sensor 20 is installed at an appropriate position inside the container 12 via the mounting portion 30 so that the pressure can be measured when the substance M comes into contact with the sensor 20 . The installation position and mounting method of the sensor 20 shall be determined in advance in consideration of the shape and size of the sensor 20 to be used, the shape and size of the container 12, and the like. In this embodiment, the tilting mixer 12A is used as the container 12, and the bar-shaped sensor 20 is used. As described above, the sensor 20 is attached at the position shown in FIGS.

S20 (Insert material): An appropriate amount of material M to be measured is introduced into the tilting mixer 12A (container 12) in accordance with the size of the tilting mixer 12A. In this embodiment, the fluidity of fresh concrete as the substance M is measured. Therefore, the fresh concrete M needs to be kneaded prior to being charged into the tilting mixer 12A, but the mixing may be performed using the tilting mixer 12A or by another method. .
S30 (Selection of object to be measured): Select the fluidity to be measured using the substance (fresh concrete) M as a sample. Here, when measuring the slump value or slump flow value of the substance M (YES), the process proceeds to S40, and when measuring other fluidity (NO), the process proceeds to S70.

S40 (Container rotation at constant speed): The rotating mechanism 18 rotates the tilting mixer 12A (container 12) at a constant speed. The constant speed of rotation at this time is, but not limited to, 1 rpm to 2 rpm, for example.
S50 (sensor measurement): The pressure received from the material (fresh concrete) M is measured by the sensor 20 . That is, due to the rotation of the tilting mixer 12A in S40, the fresh concrete M is stirred inside the tilting mixer 12A and the sensor 20 rotates. It becomes a mode to do. At this time, the pressure received as resistance from the fresh concrete M is continuously measured by the sensor 20 .

S60 (Slump value or slump flow value calculation): The calculation unit 32 acquires the pressure measured in S50 from the sensor 20 via the communication unit 60, and uses the acquired pressure to calculate the material (fresh concrete) M slump value or slump flow value. Here, in the fluidity measuring method according to the embodiment of the present invention, the relationship between the pressure that the sensor 20 receives from the substance M and the measured slump value or measured slump flow value of the substance M is obtained in advance. . That is, for example, in the case of an actual slump value, a substance (here, fresh concrete) M is put into the container 12 in which the sensor 20 is installed, and the container 12 is rotated at a constant speed. The speed at this time is the same as the rotational speed at S40. Then, after measuring the pressure received from the fresh concrete M by the sensor 20, the fresh concrete M is taken out from the container 12 and a slump test is performed using the fresh concrete M as a sample. Such pressure measurement and slump test are repeatedly performed, and the relationship between the pressure of the fresh concrete M and the measured slump value is ascertained by associating the change in the pressure of the fresh concrete M with the change in the measured slump value.

In the case of the measured slump flow, a slump flow test may be performed instead of the above slump test to grasp the relationship between the pressure of the fresh concrete M and the measured slump flow. These relationships are preset in the calculator 32 . Then, in step S60, the calculation unit 32 calculates the estimated slump value of the fresh concrete M based on the pressure measured in S50 and the preset relationship between the pressure of the fresh concrete M and the slump actual measurement value. do. For example, FIG. 5 shows an example of the relationship between the pressure value of the fresh concrete M and the actual slump value, and the black circles are the actually measured values. A solid line is a straight line connecting adjacent black circles, and a dashed line is complementary so that the change becomes gentle.

For example, when the pressure value from the fresh concrete M measured in S50 is 18 kPa, the slump value is about 8.5 cm by reading the slump actual measurement value at the position indicated by the white circle on the dashed line in FIG. It can be estimated that In this way, the slump estimated value can be calculated, and the slump flow estimated value is also the same. Note that the relationship between the pressure of the substance M and the measured slump value or the measured slump flow value is grasped for each substance M (for each substance M itself or for each material ratio constituting the substance M) or for each capacity of the container 12 used. It is preferable to keep In addition, instead of calculating the slump (or slump flow) actual measurement value that can be read from the relationship as shown in FIG. The slump (or slump flow) estimated value may be calculated by adjusting the difference between the environment and the test environment in S50.

S70 (Selection of object to be measured): Select the fluidity to be measured using the substance (fresh concrete) M as a sample. Here, if the apparent plastic viscosity or apparent yield value of the substance M is to be measured (YES), the process proceeds to S80, and if the other fluidity is to be measured (NO), the process proceeds to S130.
S80 (Container rotation at first speed): Rotation mechanism 18 rotates tilting mixer 12A (container 12) at a first constant speed. The constant speed of rotation at this time is not limited to this, but is, for example, 1 rpm to 2 rpm as low speed rotation.

S90 (sensor measurement): The pressure received from the material (fresh concrete) M is measured by the sensor 20 . That is, similarly to the above S50, the sensor 20 continuously measures the pressure received as resistance from the fresh concrete M inside the tilting drum mixer 12A.
S100 (Container rotation at second speed): Rotation mechanism 18 rotates tilting mixer 12A at a second constant speed. The constant speed of rotation at this time is not limited to this, but is, for example, about 5 rpm as medium speed rotation.
S110 (sensor measurement): The pressure received from the fresh concrete M is measured by the sensor 20 . That is, similarly to S50 and S90 described above, the sensor 20 continuously measures the pressure received as resistance from the fresh concrete M inside the tilting mixer 12A.

S120 (Apparent plastic viscosity and apparent yield value calculation): The pressure measured in S90 and S110 above is obtained by the calculation unit 32 from the sensor 20 via the communication unit 60, and using the obtained pressure, The apparent plastic viscosity and apparent yield value of the material (fresh concrete) M are calculated. Specifically, using the pressure measured in S90 and the rotation speed of the tilting mixer 12A at that time, and the pressure measured in S110 and the rotation speed of the tilting mixer 12A at that time, the minimum A relational expression between the pressure received from the fresh concrete M and the rotational speed of the tilting mixer 12A is derived by the square method. That is, when the pressure received from the fresh concrete M is P (kPa) and the rotational speed of the canting mixer 12A is N (/min), for example, the linear equation "P = g + hN" shown in the image shown in FIG. stand. Then, h, which represents the slope of this linear equation, is calculated as the apparent plastic viscosity (kPa min) of the fresh concrete M, and g, which is the intercept of the pressure P, is taken as the apparent yield value (kPa) of the fresh concrete M. It is calculated.

In this embodiment, the apparent plastic viscosity and the apparent yield value are calculated using the two constant velocities at which the container 12 is rotated in S80 and S100 and the pressure at that time. It may be calculated using the constant speed of and the pressure at that time. For example, when three constant speeds are used, in addition to the low speed rotation in S80 and the medium speed rotation in S100, the container 12 is rotated at about 10 rpm as high speed rotation, and the pressure measured at that time is also used. , a relational expression between the pressure received from the fresh concrete M and the rotational speed of the tilting mixer 12A may be derived.

S130 (container rotation): Through the selection in S30 and S70 above, any of the slump value, slump flow value, apparent plastic viscosity, and apparent yield value is selected as the fluidity of the substance (fresh concrete) M. When measuring fluidity that does not apply, the rotating mechanism 18 rotates the tilting mixer 12A (container 12) at a speed suitable for measuring the fluidity.
S140 (sensor measurement): The pressure received from the material (fresh concrete) M is measured by the sensor 20 . That is, similarly to S50, S90, and S110, the sensor 20 continuously measures the pressure received as resistance from the fresh concrete M inside the tilting mixer 12A.

S150 (fluidity calculation): The calculation unit 32 calculates the fluidity of the substance M to be measured based on the pressure measured in S140. As for the calculation method, an appropriate method according to the liquidity to be measured may be used.
S160 (use of calculation results): The results calculated in S60, S120, and S150 above are used to grasp the appropriate mixing ratio of concrete constituent materials, select concrete, develop concrete products, simulate the flow of concrete, and use concrete materials. It is used for purposes such as development and admixture development. Further, each calculation result and various data used for the calculation may be displayed on the display unit 50 or stored in the data storage unit 54 .

Now, according to the embodiment of the present invention having the above configuration, it is possible to obtain the following effects. That is, the fluidity measuring method according to the embodiment of the present invention measures the fluidity of the substance M (see FIG. 2), and is executed using the fluidity measuring device 10 as shown in FIG. . First, a sensor 20 capable of measuring pressure by contact is installed inside a rotatable container 12 installed in a facility such as a research facility (see S10 in FIG. 4). At this time, the sensor 20 is fixed via the mounting portion 30 so that the sensor 20 rotates inside the container 12 as the container 12 rotates. Next, the substance M to be measured is introduced into the container 12 in which the sensor 20 is installed (see S20 in FIG. 4). is stirred and the sensor 20 is rotated (see S130 in FIG. 4). Then, the sensor 20 passes through the material M and comes into contact with the material M, so the sensor 20 measures the pressure received from the material M at that time (see S140 in FIG. 4).

Since the pressure measured as described above serves as an index indicating the fluidity of the substance M, the fluidity of the substance M is calculated by the calculator 32 based on the pressure measured by the sensor 20. (See S150 in FIG. 4). As a result, the fluidity of the substance M can be calculated without the need to take the substance M in and out of the container 12, and if necessary, the fluidity of the substance M can be calculated continuously while the container 12 is continuously rotated. can be grasped. Therefore, labor can be greatly reduced, and the fluidity of the substance M can be easily measured while working efficiency is improved. In addition, the amount of the substance M to be measured and the size of the container 12 are sufficient as long as the pressure can be measured by the sensor 20 used. It becomes possible to use it for various purposes.

Moreover, the fluidity measuring method according to the embodiment of the present invention measures the fluidity of the fresh concrete M as described above when the substance M to be measured is fresh concrete. The measured fluidity of fresh concrete M is used to grasp the appropriate mixing ratio of concrete constituent materials according to the construction site, select concrete to be used at the construction site, develop concrete products, develop concrete materials, and develop admixtures. It can be used for various purposes such as Furthermore, if the fluidity of the fresh concrete M to be used at the construction site is grasped as described above, and a concrete pump vehicle with a capacity corresponding to it is used at the construction site, the fluidity of the fresh concrete M can be grasped. Compared to the case of using an overcapacity concrete pump truck without using it, it can contribute to the reduction of costs and the reduction of carbon dioxide emissions, and it is environmentally friendly. Also, by grasping the fluidity of the fresh concrete M, it is expected that verification experiments such as pouring fresh concrete M into a formwork that imitates it, which is performed especially when the formwork shape at the construction site is complicated, will be omitted. can also

Furthermore, in the fluidity measuring method according to the embodiment of the present invention, a tilting mixer 12A as shown in FIGS. . The sensor 20 is mounted by the mounting portion 30 at a position such that the sensor 20 is repeatedly moved in and out of the substance M in the tilting mixer 12A when the tilting mixer 12A is rotated. As a result, the material M can be efficiently stirred by the tilting mixer 12A, and the pressure from the material M can be efficiently measured by the sensor 20. FIG. Furthermore, since the shape of the tilting drum mixer 12A is similar to the drum of the agitator wheel, especially when measuring the fluidity of fresh concrete as the material M, the change over time of the fluidity of the fresh concrete M on the agitator wheel can be grasped. can be expected to be applied for

Further, when measuring the slump value or the slump flow value of the substance M, the fluidity measuring method according to the embodiment of the present invention is such that when the container 12 is rotated at a constant speed, the sensor 20 receives from the substance M The relationship between the pressure and the slump actual measurement value or slump flow actual measurement value of the substance M at that time is grasped in advance. That is, both the pressure measurement of the substance M when rotating at a constant speed in the container 12 and the slump test and slump flow test using the substance M as a sample are repeatedly performed, and the results are used to determine the above. (see, for example, FIG. 5). Then, when measuring the substance M, the container 12 is rotated at a constant speed, the pressure received by the sensor 20 from the substance M in the container 12 at that time, the pressure grasped as described above and the actual slump value of the substance M or The calculating unit 32 calculates the slump estimated value or the slump flow estimated value of the material M based on the relationship with the slump flow actual measurement value (see S40 to S60 in FIG. 4). This makes it possible to continuously and easily measure the slump of the substance M and the change over time of the slump flow while reducing the work effort.

In addition, when measuring the apparent viscosity of the substance M, the fluidity measuring method according to the embodiment of the present invention rotates the container 12 at at least two constant speeds, and rotates the sensor 20 at one of the constant speeds. measures the pressure received from the substance M by the sensor 20 and the pressure received by the sensor 20 from the substance M at the other constant speed (see S80 to S110 in FIG. 4). Furthermore, based on one constant speed and pressure at that time and the other constant speed and pressure at that time, the calculation unit 32 uses the least squares method to calculate the rotational speed of the container 12 and the pressure received from the substance M. A relational expression with the pressure is derived by expressing the pressure as a linear equation of the rotation speed (see, for example, FIG. 6). Then, the slope of the linear equation is calculated as the apparent plastic viscosity of the substance M, and the pressure intercept is calculated as the apparent yield value of the substance M (see S120 in FIG. 4). This makes it possible to easily measure the apparent plastic viscosity and apparent yield value of the substance M while reducing labor.

On the other hand, the fluidity measuring device 10 according to the embodiment of the present invention has a configuration capable of realizing the fluidity measuring method according to the embodiment of the present invention, and is used for the fluidity measuring method. , the same effect as the fluidity measuring method can be obtained.
On the other hand, a fluidity measuring system 40 according to an embodiment of the present invention includes a display unit 50, a data storage unit 54, and a communication unit 60 in addition to the fluidity measuring device 10 described above. The display unit 50 displays a plurality of data including calculation results by the calculation unit 32 of the fluidity measuring device 10, and the data storage unit 54 stores such a plurality of data. The communication unit 60 communicably connects the sensor 20 and the calculation unit 32 of the liquidity measuring device 10 and also communicably connects the calculation unit 32 and the data storage unit 54 . With such a configuration, it is possible to smoothly confirm various data via the display unit 50, save data via the data storage unit 54 and confirm the saved data, and transmit/receive data via the communication unit 60. can be done. Therefore, the operator can efficiently proceed with the measurement work, and the stored various data can be used for various purposes.

10: fluidity measuring device, 12: container, 12A: tilting mixer, 18: rotating mechanism, 20: sensor, 30: mounting part, 32: calculation part, 40: fluidity measuring system, 50: display part, 54: Data storage unit, 60: communication unit, M: substance (fresh concrete)

Claims (11)

A method for measuring the fluidity of a substance, comprising:
installing a sensor inside a rotatable container installed in a facility so as to rotate as the container rotates;
putting the substance into the container;
Rotating the container to pass the sensor through the substance, and measuring the pressure received from the substance at that time by the sensor;
A method of measuring fluidity, comprising calculating the fluidity of the substance based on the pressure measured by the sensor. 2. The fluidity measuring method according to claim 1, wherein fluidity of fresh concrete is calculated as said substance. Rotate the container at a constant speed, and based on the pressure received by the sensor from the substance at that time and the previously grasped relationship between the pressure and the measured slump value or measured slump flow value of the substance, 3. The fluidity measuring method according to claim 1, wherein an estimated slump value or an estimated slump flow value of the substance is calculated. rotating the container at at least two constant speeds and based on the pressure experienced by the sensor from the substance during one constant speed and the pressure received by the sensor from the substance during the other constant speed; 3. The fluidity measuring method according to claim 1 or 2, wherein the apparent plastic viscosity and apparent yield value of the substance are calculated using the method of least squares. 5. The fluidity according to any one of claims 1 to 4, wherein a tilting mixer is used as the container, and when the tilting mixer is rotated, the sensor is repeatedly moved in and out of the substance. measurement method. A device for measuring the fluidity of a substance, comprising:
a container installed in a facility and into which the substance is introduced;
a rotation mechanism for rotating the container at a variable rotation speed;
a sensor that measures the pressure when contacting the substance;
a mounting portion for mounting the sensor at a position such that it rotates inside the container as the container rotates and passes through the substance put into the container;
and a calculating unit that calculates the fluidity of the substance based on the pressure measured by the sensor during rotation of the container. 7. The fluidity measuring device according to claim 6, wherein fluidity of fresh concrete is calculated as said substance. The calculation unit calculates the pressure received by the sensor from the substance when the container is rotated at a constant speed by the rotation mechanism, and a slump actual measurement value or a slump flow measurement of the preset pressure and the substance. 8. The fluidity measuring device according to claim 6, wherein the slump estimated value or the slump flow estimated value of the substance is calculated based on the relationship between the flow rate and the value. When the container is rotated at at least two constant velocities by the rotating mechanism, the calculator calculates the pressure received by the sensor from the substance during one constant velocity and the pressure received by the substance during the other constant velocity. 8. The fluidity according to claim 6 or 7, wherein the apparent plastic viscosity and the apparent yield value of the substance are calculated using the least squares method based on the pressure received by the sensor from the substance. measuring device. The container is a tilting mixer,
7. The mounting portion mounts the sensor at a position such that the sensor is repeatedly moved in and out of the substance in the tilting mixer when the tilting mixer is rotated. 10. The fluidity measuring device according to any one of 9. The fluidity measuring device according to any one of claims 6 to 10;
a display unit for displaying a plurality of data including calculation results of the calculation unit;
a data storage unit for storing the plurality of data;
A fluidity measurement system, comprising: a communication unit for transmitting and receiving data between the sensor and the calculation unit and between the calculation unit and the data storage unit.

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