JP7600532B2 - Method for quality control of cement composition - Google Patents

Description

The present invention relates to a method for quality control of a cement composition.

The fluidity of concrete (an example of a cement composition) decreases over time. This decrease in fluidity can cause problems (poor filling, brittleness, clogged pipes, etc.). Therefore, slump (or slump flow) tests are conducted to evaluate the fluidity of concrete. In addition, in Patent Document 1, a recess is provided in a mixer, and an image of the concrete that has entered the recess while mixing the concrete is taken, and the fluidity is estimated based on the image.

JP 2019-124650 A

Because the slump test must be performed on-site at specific times (e.g., every 30 minutes), it is not possible to constantly grasp the fluidity of the concrete (cement composition). Even with the method of Patent Document 1, it is difficult to constantly grasp the fluidity of the concrete, and this method requires modification of the drum, making it unsuitable for general use.

The present invention was made in consideration of these problems, and its purpose is to make it possible to constantly monitor the fluidity of a cement composition.

The main invention for achieving the above object is a quality control method for a cement composition, comprising: a measuring step of measuring a flow state of a cement composition flowing down an inclined portion with a measuring meter; a threshold setting step of setting a threshold; and a judging step of judging the quality of the cement composition by comparing an output of the measuring meter with the threshold, wherein the flow state is a flow load, the measuring meter is a load meter, and has a load detection unit including the load meter and inserted into the cement composition flowing down the inclined portion, the load detection unit outputs a signal corresponding to the pressure received from the cement composition, the load detection unit has a cylinder inserted into the cement composition and a plate member having one end fixed to the inclined portion and the other end inserted into the cylinder, the load meter is provided between the cylinder and the plate member, and the cylinder outputs the signal corresponding to the pressure received by the cement composition.
Other features of the present invention will become apparent from the following detailed description of the present invention and the accompanying drawings.

According to the present invention, the fluidity of a cement composition can be constantly monitored.

FIG. 1 is a schematic explanatory diagram showing an example of a concrete application method. FIG. 2 is a schematic diagram of a measurement unit 30 according to the present embodiment. 2 is a schematic cross-sectional view showing the configuration of a probe 35. FIG. 4A to 4C are explanatory diagrams of a method for measuring the height of the top of concrete using the laser displacement meter 34. 5A and 5B are diagrams showing measurement data when the slump is large and small, respectively. FIG. 1 is a diagram showing the relationship between slump and load. FIG. 1 is a diagram showing the relationship between slump and top height of concrete. FIG. 1 is a diagram showing the relationship between slump and flow velocity of concrete. FIG. 13 is a diagram showing the relationship between the top height of the concrete and the load. FIG. 1 is a flow diagram of a method for managing the fluidity of concrete in a comparative example. FIG. 2 is a flow diagram of a method for managing the fluidity of concrete in the present embodiment.

At least the following points will become apparent from the description of this specification and the accompanying drawings.
A quality control method for a cement composition is disclosed, which is characterized by having a measuring step of measuring the flow state of the cement composition flowing down an inclined section with a measuring meter, a threshold setting step of setting a threshold, and a judging step of judging the quality of the cement composition by comparing the output of the measuring meter with the threshold.

This method of quality control for cement compositions allows the fluidity of the cement composition to be constantly monitored.

In such a quality control method for a cement composition, it is desirable that the threshold value be determined based on the fluidity state relative to the slump of the reference cement composition.

This method of quality control for cement compositions allows appropriate threshold values to be set.

In the quality control method for such a cement composition, the flow state is a flow load, the measuring meter is a load meter, includes the load meter, and has a load detection unit inserted into the cement composition flowing through the inclined portion, and the load detection unit may output a signal corresponding to the pressure received from the cement composition.

According to this quality control method for a cement composition, the fluidity of the cement composition can be evaluated based on the pressure (load) that the load detection unit receives from the cement composition.

In the quality control method for such a cement composition, it is preferable that the load detection unit has a cylinder inserted into the cement composition and a plate member having one end fixed to the inclined portion and the other end inserted into the cylinder, and the load meter is provided between the cylinder and the plate member, and outputs the signal according to the pressure that the cylinder receives from the cement composition.

This method of quality control for cement compositions makes it possible to measure the load exerted by the cement composition flowing down the inclined section.

In this method for quality control of a cement composition, it is preferable that the cylinder is a cylinder.

This quality control method for cement compositions allows the cement composition to flow smoothly.

In the quality control method for such a cement composition, the fluidity state is a fluidity height,
The measuring device may measure the height of the cement composition flowing down the inclined portion.

This method of quality control for cement compositions allows the fluidity of the cement composition to be evaluated based on its height.

In this method for controlling the quality of a cement composition, an obstacle is inserted into the cement composition flowing through the inclined portion, and the measuring device is preferably disposed upstream of the obstacle in the flow direction of the cement composition.

This quality control method for a cement composition makes it easier to evaluate the fluidity because the cement composition tends to accumulate in front of the obstacle.

In such a quality control method for a cement composition, it is desirable that the measuring device is also disposed downstream of the obstacle in the flow direction of the cement composition.

This method of quality control for cement compositions can improve the accuracy of evaluation.

In the quality control method for such a cement composition, the flow state may be a flow velocity, and the measuring device may measure the velocity of the cement composition flowing through the inclined portion.

According to this quality control method for cement compositions, the fluidity of the cement composition can be evaluated based on its flow rate.

In such a method for quality control of a cement composition, it is preferable that the measuring device is a non-contact Doppler sensor.

This method of quality control for cement compositions makes it easy to measure the flow rate.

In such a method for controlling the quality of a cement composition, it is desirable to change the threshold value depending on the supply speed of the cement composition when it is poured.

This method of quality control for cement compositions allows a threshold value to be set that is appropriate for the supply rate.

====Present Embodiment====
<About concrete construction>
Fig. 1 is a schematic diagram showing an example of a concrete construction method. In Fig. 1, a ready-mix concrete truck 10 and a pump truck 20 are deployed to a concrete pouring site. The ready-mix concrete truck is also called a mixer truck or an admixture data truck.

The ready-mix concrete truck 10 is a vehicle that transports the concrete materials delivered at the concrete manufacturing plant to the pouring site while mixing them. The ready-mix concrete truck 10 is equipped with a drum 12 and a chute 14 (corresponding to the inclined section).

The drum 12 is a roughly cylindrical container for loading ready mixed concrete (hereinafter simply referred to as concrete). The drum 12 rotates constantly while the ready mixed concrete truck 10 is traveling, mixing the concrete ingredients. This prevents the aggregate and water from separating, and keeps the concrete homogeneous.

The chute 14 is a member for guiding (discharging) the concrete in the drum 12 to the desired unloading position, and is provided at an incline behind the drum 12. In addition, the chute 14 of this embodiment is provided with a measuring unit 30 (described below).

The pump truck 20 is a vehicle for pumping the concrete transported to the site by the ready-mix concrete truck 10 to the pouring location. The pump truck 20 is equipped with a hopper 22, a pump 24, and a concrete supply pipe 26.

The hopper 22 is provided at the rear of the pump vehicle 20 and is positioned opposite the chute 14 of the ready-mix concrete truck 10. The hopper 22 receives the concrete discharged from the chute 14 of the ready-mix concrete truck 10.

The pump 24 is, for example, a twin-cylinder reciprocating pump, and generates hydraulic pressure to push the concrete supplied from the hopper 22 to a cylinder (not shown) out of the cylinder. The pump 24 then pumps the concrete in the cylinder at high pressure into the concrete supply pipe 26.

The concrete supply pipe 26 is a tubular member that transports the concrete pushed out of the cylinder by the pump 24 to the casting location (such as a formwork).

The concrete transferred from the chute 14 of the ready-mix concrete truck 10 to the hopper 22 of the pump truck 20 is poured into a formwork or the like through a concrete supply pipe 26 driven by the pump 24.

<Regarding the measuring unit 30>
Fig. 2 is a schematic diagram of the measuring unit 30 in this embodiment, and Fig. 3 is a schematic cross-sectional view showing the configuration of a cylindrical load meter (hereinafter, referred to as a probe) 35.

As shown in FIG. 2, a measuring unit 30 is provided on the chute 14 of the ready-mix concrete truck 10. This measuring unit 30 measures the flow state of the concrete (in this embodiment, the flow state of the concrete flowing through the chute 14). Note that in this embodiment, the measuring unit 30 is detachable from the chute 14, and can be attached to the chute 14 of the ready-mix concrete truck 10 that has been dispatched. However, this is not limited to this, and the measuring unit 30 may be attached to the chute 14 of the ready-mix concrete truck 10 in advance. It may also be attached to a member other than the chute 14.

As shown in FIG. 2, the measurement unit 30 of this embodiment includes a pair of L-shaped angles 31 fixed to the chute 14, an iron plate 32, a magnet stand 33, a laser displacement meter 34, and a probe 35. When describing the position of each component in FIG. 2, the side on which the L-shaped angles 31 are positioned with respect to the chute 14 is referred to as the top, and the opposite side is referred to as the bottom.

The L-shaped angles 31 are steel members (angle iron) with an L-shaped cross section. The pair of L-shaped angles 31 are arranged with their outer surfaces facing each other, with the steel member 352 (described later) of the probe 35 sandwiched between them, and are fixed in place by a vice or the like. The pair of L-shaped angles 31 are also fixed to the chute 14 by a vice or the like.

The iron plate 32 is a long, thin flat plate that is fixed to the underside of the pair of L-shaped angles 31. More specifically, the iron plate 32 is arranged so that its longitudinal direction is aligned with the flow direction of the concrete (corresponding to the flow direction), and the approximate center portion in the longitudinal direction is fixed to the underside of the pair of L-shaped angles 31.

The magnetic stands 33 are members (holding devices) for fixing the laser displacement gauge 34 onto the iron plate 32, and are provided at both ends of the iron plate 32 in the longitudinal direction.

As shown in FIG. 3, the probe 35 (corresponding to the load detection unit and the obstacle) includes a cylinder 350, steel material 351, steel material 352, and a load meter 353 (corresponding to the measuring meter).

The cylinder 350 (corresponding to a cylindrical body) is a cylindrical member with a circular cross section. Note that the cross section is not limited to a circular one, and may be a cylindrical member of another shape (e.g., triangular or rectangular). However, if the cross section is made circular (i.e. cylindrical) as in this embodiment, the flow of the concrete when inserted into the concrete will be smoother. Also, if the load meter 353 is not used and only the concrete height is measured with the laser displacement meter 34, it is sufficient that the object be an obstacle to the flow of concrete. For example, it may be a column or a square pillar that is not cylindrical (cylinder). It may also be a reinforcing bar, etc.

The steel material 351 is a member for attaching the load meter 353 to the inner surface of the cylinder 350. For this reason, the surface of the steel material 351 that faces the cylinder 350 is shaped (curved) to follow the shape of the inner surface of the cylinder 350, and the steel material 351 is fixed to the inner surface of the cylinder 350. Note that if the cross section of the cylinder 350 is not circular but is triangular or rectangular, and the load meter 353 is to be attached to a linear portion (flat surface), the load meter 353 may be attached directly without using the steel material 351.

The steel material 352 (corresponding to a plate member) is a plate-shaped member, and as shown in FIG. 3, its lower end is disposed inside the cylinder 350, and its upper end extends upward beyond the cylinder 350 and is fixed between a pair of L-shaped angles 31. In other words, the steel material 352 is fixed to the chute 14.

The load meter 353 is sandwiched between the steel material 351 fixed to the cylinder 350 and the steel material 252 fixed to the chute 14. When the cylinder 350 receives pressure from the concrete, the load meter 353 outputs a signal corresponding to that pressure. In other words, the load meter 353 measures the load of the concrete flowing through the chute 14 (corresponding to the flow load).

The laser displacement meter 34 is attached to the magnet stand 33 so as to face the concrete flowing through the chute 14. The laser displacement meter 34 is also provided upstream and downstream of the probe 35 in the flow direction (flow direction) of the concrete. Of these, the laser displacement meter 34 provided on the upstream side is also referred to as laser displacement meter 34A, and the laser displacement meter 34 provided on the downstream side is also referred to as laser displacement meter 34B.

The laser displacement meter 34 has a laser emitting unit (not shown) and a reflected laser receiving unit (not shown), and measures the distance to the object to be measured by receiving the laser emitting unit and reflected by the object to be measured with the reflected laser receiving unit. In this embodiment, the laser displacement meter 34 measures the top height (corresponding to the flow height) of the concrete flowing through the chute 14.

Figures 4A to 4C are explanatory diagrams of a method for measuring the height of the concrete top using a laser displacement meter 34.

As shown in Figure 4A, the distance between each laser displacement meter 34 and the bottom of the chute 14 is measured when no concrete is flowing into the chute 14. In Figure 4A, the distance (measurement value) is d1 on both the upstream side (laser displacement meter 34A) and the downstream side (laser displacement meter 34B).

As shown in Figure 4B, when concrete is flowing in the chute 14 and the slump is large, the concrete is soft and flows like a liquid. As a result, the load on the probe 35 is small and the concrete top height is low. In Figure 4B, the measurement value on the upstream side (laser displacement meter 34A) is d2 (< d1), and the measurement value on the downstream side (laser displacement meter 34B) is d2' (< d1). In this case, the concrete top height is calculated as d1-d2 on the upstream side and d1-d2' on the downstream side. When the slump is large, the difference between the measurement value on the upstream side (d2) and the measurement value on the downstream side (d2') is small, as shown in Figure 4B, and the difference between the top height on the upstream side and the top height on the downstream side is also small.

Also, as shown in FIG. 4C, when concrete is flowing in the chute 14 and the slump is small, the probe 35 becomes an obstacle, and concrete tends to pile up in front of the probe 35 (upstream of the flow). As a result, the load on the probe 35 is large, and the concrete top height in front of the probe 35 (upstream side) becomes high. In FIG. 4C, the measurement value on the downstream side (laser displacement meter 34B) is d3' (<d1), while the measurement value on the upstream side (laser displacement meter 34A) is d3 (<d3'). In this case, too, the concrete top height is calculated as d1-d3 on the upstream side and d1-d3' on the downstream side. When the slump is small, the measurement value on the upstream side (d3) is smaller than the measurement value on the downstream side (d3') as shown in FIG. 4C. In other words, the concrete top height tends to be high on the upstream side.

Although not shown here, a Doppler-type non-contact flow meter (for example, the WJ7661 RYUKAN manufactured by Yokogawa Denki Co., Ltd.) can also be used to measure the flow velocity (equivalent to the flow rate) of concrete flowing through the chute 14. This non-contact flow meter uses radio waves (microwaves) to measure the flow velocity of rivers and the like, but can also be applied to the flow of concrete. It is preferable to place the non-contact flow meter perpendicular to the slope of the chute 14 (the flow of concrete), but if this is not possible, a correction can be made.

The output of the load meter 353 and the laser displacement meter 34 (and the non-contact flow meter) is transmitted to a terminal device (not shown) such as a personal computer (PC) or a tablet terminal via a communication means such as a cable (wired) or wirelessly. This terminal device has a memory unit that stores data and programs, a calculation unit that performs various calculations based on the programs, a display unit that displays the measurement data (waveforms, etc.), and a warning unit that issues a warning by sound or light emission, etc. The terminal device manages the measured data and issues a warning when the measurement value reaches a predetermined value (threshold value).

<Relationship between slump and various measurement data>
FIG. 5A is a diagram showing an example of each measurement data when the slump is large (here, 24.5 cm), and FIG. 5B is a diagram showing an example of each measurement data when the slump is small (here, 9 cm).

In both Figures 5A and 5B, the load, height (height of the concrete top), and flow velocity are arranged from the top. The horizontal axis of each graph is time. The load is the measurement value obtained by the load meter 353 of the probe 35, and the height is the value (height of the concrete top) calculated from the measurements of the laser displacement meter 34 (upstream laser displacement meter 34A and downstream laser displacement meter 34B) (see Figures 4B and 4C). The flow velocity is the value measured by a Doppler-type non-contact flow meter or the like for the concrete flowing through the chute 14.

When the slump is large, the concrete is soft and flows easily, so the load is small, the height is low, and the flow rate is fast, as shown in Figure 5A.

In contrast, when the slump is small, the concrete becomes harder, and the load (the force that the load meter 353 of the probe 35 receives from the concrete) becomes larger. It can also be seen that the height is higher than in Figure 5A, and the value on the upstream side (laser displacement meter 34A) is particularly large. As the concrete hardens, it becomes more difficult to flow, and the flow velocity becomes smaller than in Figure 5A.

Figure 6 shows the relationship between slump and load, and Figure 7 shows the relationship between slump and concrete top height. Note that Figure 7 shows the top height of the concrete flowing through the chute 14 upstream of the probe 35 (i.e., the measurement value of the laser displacement meter 34A). Figure 8 shows the relationship between slump and concrete flow velocity, and Figure 9 shows the relationship between the concrete top height and load. Each figure shows the measurement results for each pumping speed. Note that the pumping speed is the speed at which concrete is pumped from the pump vehicle 20, and can be set in the pump vehicle 20. Since it is necessary to supply concrete from the ready-mix concrete truck 10 to the pump vehicle 20 according to this pumping speed, the pumping speed is correlated with the supply speed of concrete from the ready-mix concrete truck 10 to the pump vehicle 20. In other words, the higher the pumping speed, the higher the supply speed of concrete from the ready-mix concrete truck 10 to the pump vehicle 20.

As shown in Figure 6, when the slump is large, the load is small, and when the slump is small, the load is large. Also, the higher the pumping speed (supply speed), the higher the load.

As shown in Figure 7, when the slump is large, the concrete top height is low, and when the slump is small, the top height is high. Also, the higher the pumping speed (supply speed), the higher the top height.

As shown in Figure 8, when the slump is large, the flow rate of the concrete flowing through the chute 14 is fast, and when the slump is small, the flow rate is slow. When the slump is large, the difference in flow rate due to the pumping speed (supply rate) is large, but when the slump is small, the difference in flow rate due to the pumping speed becomes smaller, and at a slump of 9.5, the flow rate is almost the same regardless of the pumping speed.

Figure 9 also shows that there is a correlation between height and load. In other words, the flow state of concrete can be measured by either load or height alone. Figures 5A and 5B also show that there is a correlation between flow velocity and load and height.

As such, since there is a correlation between slump and each measurement value, by having AI or other devices learn the relationship between the slump at the time the concrete is accepted and the measurement data, it is possible to convert (correspond) subsequent measurement values to slump values.

<How to control the fluidity of concrete>
Comparative Example
Before describing this embodiment, a general management method (comparative example) that does not use the measurement unit 30 will be described.

Figure 10 is a flow diagram of a method for controlling the fluidity of concrete (quality control method) in a comparative example.

First, concrete is ordered (S201). Then, when the ready-mix concrete truck 10 arrives at the site (S202), an acceptance inspection is performed (S203). If the acceptance inspection fails (NO in S203), the concrete is returned and discarded (S204), and step S201 of ordering concrete is executed again. Note that an acceptance inspection fails when the slump or air content does not meet the specified standards. For example, if concrete with a slump of 18 cm is ordered and the acceptable range is ±2.5 cm, a slump of 21 cm fails, and the concrete is returned to the plant (or discarded).

If the acceptance inspection is passed (YES in S203), concrete pouring is started using the ready mixed concrete truck 10 and the pump truck 20 (S205). In addition, a slump test is performed at an appropriate timing (for example, every 30 minutes) (S206). If the result of the slump test is that the fluidity is NG (fail) (NO in S207), the remaining concrete is returned and discarded (S204), and the process returns to the step of ordering concrete (step S201). If the result of the slump test is that the fluidity is OK (pass) (YES in S207), a determination is made as to whether pouring is complete (step 208). If pouring is not complete (NO in S208), a slump test is performed at an appropriate timing while continuing pouring the concrete. If it is determined in step S208 that pouring of the concrete is complete (YES in S208), pouring of the concrete is terminated.

In this comparative example, the fluidity of the concrete is repeatedly evaluated by conducting slump tests at appropriate times (for example, every 30 minutes). In this case, the more slump tests are conducted, the more reliable the quality can be, but it takes time. Also, in order to manage the fluidity in real time, the tests would have to be conducted many times, which is practically impossible. Also, the condition (fluidity) of the concrete flowing through the chute 14 of the ready-mix concrete truck 10 can be visually checked, but this is subjective and requires the deployment of dedicated personnel.

(Present embodiment)
Fig. 11 is a flow diagram of a method for controlling the fluidity of concrete (quality control method) in this embodiment. In this embodiment, a warning is issued when the slump falls below a predetermined value (e.g., 9.0 cm). Note that although the following describes a case where the load is measured, the same control can be applied when measuring the top height or flow velocity of the concrete.

Steps S101 to S105 correspond to steps S201 to S205 in the comparative example, respectively, and therefore will not be described here. In this embodiment, when the ready-mixed concrete truck 10 arrives at the site, the measurement unit 30 is attached to the chute 14 of the ready-mixed concrete truck 10 (S106). Note that the measurement unit 30 may be attached to the chute 14 of the ready-mixed concrete truck 10 in advance. In addition, when measuring the flow velocity of the concrete, a Doppler-type non-contact flow meter is placed near the chute 14 (i.e., the flow path of the concrete).

At the same time as concrete pouring starts, the load meter 353 starts measuring the waveform (S107), and the acceptance inspection result (slump) and the measured waveform (load) are calibrated using AI (machine learning, etc.) (S108) to obtain a reference value. That is, the slump of the reference concrete (corresponding to the reference cement composition) is associated with the load. Then, a threshold value for issuing a warning is set (S109: corresponding to the threshold setting step). For example, as shown in FIG. 6, since the load and the slump have a roughly linear relationship, if data is accumulated, the load (threshold value) at which the slump becomes 9.0 can be set by AI, etc. (the increase in the load relative to the decrease in the slump can be estimated). This threshold value is stored in the memory unit of the terminal device (not shown). As shown in FIG. 6, the load depends on the supply speed (pumping speed) of the concrete to the pump vehicle 20, so it is desirable to change the threshold value according to the supply speed.

The fluidity (here, the load) of the concrete flowing through the chute 14 is then confirmed (measured) by the load meter 353 (corresponding to S110: measurement step). The terminal device compares the output (measurement data) of the load meter 353 with a stored threshold (e.g., a load threshold corresponding to a slump of 9.0) and determines whether the measured value has reached the threshold (is smaller than the threshold) (S111: determination step). When the measured value reaches the threshold (e.g., a value corresponding to a slump of 9.0) (NO in S111), the terminal device issues a warning, such as by emitting a sound. If this warning is given (YES in S112), step S104 is executed to return and discard the remaining concrete.

If the measured value has not reached the threshold value in step S111 (YES in S111) or if there is no warning in step S112 (NO in S112), a determination is made as to whether pouring is complete (step S113). If pouring is not complete (NO in S113), the process returns to step S110 and measurement and comparison continue. On the other hand, if pouring is complete (YES in S113), concrete pouring and measurement are terminated.

As explained above, in this embodiment, the measuring unit 30 (load meter 353) is attached to the chute 14 of the ready-mix concrete truck 10. Then, the process performs a step (S110) of measuring the flow state (load) of the concrete flowing through the chute 14 with the load meter 353, a step (S109) of setting a threshold value, and a step (S111) of judging whether the concrete is good or bad by comparing the output of the load meter 353 with the threshold value.

This allows the fluidity of concrete (load in this example) to be measured automatically, making it possible to manage the fluidity of concrete in real time.

In this embodiment, the case of measuring the load of concrete flowing through the chute 14 of the ready-mix concrete truck 10 has been described, but the top height or flow velocity of the concrete may also be measured. In this case, a threshold value may also be set and the measured value may be compared with the threshold value. Also, the fluidity of concrete may be evaluated by combining the load, height, and flow velocity.

===Other embodiments===
Although the embodiment of the present invention has been described above, the above embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. Furthermore, the present invention can be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents. For example, the following modifications are possible.

The above embodiment illustrates the case of controlling the fluidity of concrete, but the present invention is not limited to this and can also be applied to other cement compositions (e.g., mortar).

In addition, in the above-mentioned embodiment, the state of concrete flowing through the chute 14 of the ready-mix concrete truck 10 was measured, but the measurement is not limited to the chute 14, and similar measurements can be made by pouring concrete through an inclined member. For example, a member having an inclined surface (corresponding to the inclined portion) can be placed between the chute 14 of the ready-mix concrete truck 10 and the hopper 22 of the pump truck 20, and a measuring unit 30 can be provided on the member to measure the flow state of the concrete flowing through the inclined surface.

In the above embodiment, the laser displacement gauges 34 for measuring the concrete height were provided as a laser displacement gauge 34A upstream of the probe 35 and a laser displacement gauge 34B downstream of the probe 35, but at least a laser displacement gauge 34A is sufficient. However, by providing a laser displacement gauge 34 upstream and downstream of the probe 35 as in this embodiment, the accuracy of the evaluation can be improved. Also, three or more laser displacement gauges 34 may be provided (for example, a further laser displacement gauge may be provided between the probe 35 and the laser displacement gauge 34B).

10 ready-mix concrete truck, 12 drum, 14 chute,
20 pump vehicle, 22 hopper, 24 pump, 26 concrete supply pipe,
30 measuring part, 31 L-shaped angle, 32 iron plate,
33 magnet stand, 34 laser displacement meter (measuring instrument),
34A laser displacement meter, 34B laser displacement meter,
35 Probe (load detection unit, obstacle),
350 cylinder (cylindrical body), 351 steel material, 352 steel material (plate member),
353 Load cell (measuring meter),

Claims (5)

A measuring step of measuring a flow state of the cement composition flowing through the inclined portion with a measuring meter;
a threshold setting step of setting a threshold;
A determination step of determining whether the cement composition is good or bad by comparing the output of the measuring meter with the threshold value;
having
The flow state is a flow load,
the measuring instrument is a load cell,
The load detector includes the load meter and is inserted into the cement composition flowing along the inclined portion.
The load detection unit outputs a signal corresponding to the pressure received from the cement composition,
The load detection unit is
A cylinder inserted into the cement composition;
a plate member having one end fixed to the inclined portion and the other end inserted into the cylindrical body;
having
The load meter is provided between the cylinder and the plate member, and outputs the signal in response to the pressure that the cylinder receives from the cement composition.
A method for quality control of a cement composition comprising the steps of: The quality control method for a cement composition according to claim 1 , wherein the cylindrical body is a cylinder.
A method for quality control of a cement composition comprising the steps of: A measuring step of measuring a flow state of the cement composition flowing through the inclined portion with a measuring meter;
a threshold setting step of setting a threshold;
A determination step of determining whether the cement composition is good or bad by comparing the output of the measuring meter with the threshold value;
having
The flow state is a flow height,
The measuring device measures the height of the cement composition flowing on the inclined portion,
An obstacle is inserted into the cement composition flowing down the inclined portion,
The measuring meter is disposed upstream of the obstacle in the flow direction of the cement composition.
A method for quality control of a cement composition comprising the steps of: A method for quality control of a cement composition according to claim 3 , comprising:
The measuring meter is also arranged downstream of the obstacle in the flow direction of the cement composition.
A method for quality control of a cement composition comprising the steps of: A quality control method for a cement composition according to any one of claims 1 to 4 , comprising:
The threshold value is changed depending on the supply speed at the time of pouring the cement composition.
A method for quality control of a cement composition comprising the steps of:

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