Method for quality control of cement composition

Abstract

To allow for constantly grasping fluidity of cement compositions.SOLUTION: A method provided herein comprises a measurement step for measuring the fluidity of a cement composition flowing on a slope using a measurement meter, a threshold setting step for setting a threshold value, and a determination step for determining the quality of the cement composition by comparing an output of the measurement meter to the threshold value.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a method for quality control of a cement composition. [Background technology]

[0002] Concrete (one example of a cement composition) loses fluidity over time. This loss in fluidity can cause problems (poor filling, brittleness, clogged pipes, etc.). Therefore, a slump (or slump flow) test is conducted to evaluate the fluidity of concrete. 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-124650 A Summary of the Invention [Problem to be solved by the invention]

[0004] Since the slump test needs to be performed at a specific timing (for example, every 30 minutes) on-site, 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 since this method requires modification of the drum, it cannot be used for general purposes.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to constantly grasp the fluidity of a cement composition. [Means for solving the problem]

[0006] 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. Effect of the Invention

[0007] According to the present invention, the fluidity of a cement composition can be constantly monitored. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic explanatory diagram showing an example of a concrete application method. [Diagram 2] FIG. 2 is a schematic diagram of a measurement unit 30 in the present embodiment. [Diagram 3] 2 is a schematic cross-sectional view showing the configuration of a probe 35. FIG. [Figure 4] 4A to 4C are explanatory diagrams of a method for measuring the height of the top end of concrete using the laser displacement meter 34. FIG. [Diagram 5] Fig. 5A is a diagram showing each measurement data when the slump is large, and Fig. 5B is a diagram showing each measurement data when the slump is small. [Figure 6] FIG. 1 is a diagram showing the relationship between slump and load. [Figure 7]FIG. 1 is a diagram showing the relationship between slump and top height of concrete. [Figure 8] FIG. 1 is a diagram showing the relationship between slump and flow velocity of concrete. [Figure 9] FIG. 13 is a diagram showing the relationship between the top height of the concrete and the load. [Figure 10] FIG. 1 is a flow diagram of a method for managing the fluidity of concrete in a comparative example. [Figure 11] FIG. 2 is a flow diagram of a method for managing the fluidity of concrete in the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] 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.

[0010] According to such a quality control method for a cement composition, the fluidity of the cement composition can be constantly monitored.

[0011] In such a method for quality control of a cement composition, it is preferable that the threshold value is determined based on the fluidity state relative to the slump of a standard cement composition.

[0012] According to such a method for quality control of a cement composition, an appropriate threshold value can be set.

[0013] In such a quality control method for a cement composition, the flow state is a flow load, the measuring meter is a load meter, and includes the load meter and has a load detection unit inserted into the cement composition flowing down the inclined section, and the load detection unit may be configured to output a signal corresponding to the pressure received from the cement composition.

[0014] According to such a 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.

[0015] In such a quality control method for a cement composition, it is desirable that the load detection unit has a cylindrical body to be inserted into the cement composition and a plate member having one end fixed to the inclined portion and the other end inserted into the cylindrical body, and the load meter is provided between the cylindrical body and the plate member and outputs the signal in response to the pressure received by the cement composition on the cylindrical body.

[0016] According to such a method for quality control of a cement composition, the load applied by the cement composition flowing down a slope can be measured.

[0017] In such a method for quality control of a cement composition, the cylindrical body is preferably a cylinder.

[0018] Such a method for controlling the quality of a cement composition allows the cement composition to flow smoothly.

[0019] 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.

[0020] According to such a method for controlling the quality of a cement composition, the fluidity of the cement composition can be evaluated based on its height.

[0021] In such a quality control method for a cement composition, it is desirable that an obstacle is inserted in the cement composition flowing down the inclined section, and the measuring meter is positioned upstream of the obstacle in the flow direction of the cement composition.

[0022] According to such a quality control method for a cement composition, the cement composition is likely to accumulate in front of the obstacle, making it easy to evaluate the fluidity.

[0023] In such a method for controlling the quality of a cement composition, it is preferable that the measuring meter is also disposed downstream of the obstacle in the flow direction of the cement composition.

[0024] According to such a quality control method for a cement composition, the accuracy of the evaluation can be improved.

[0025] In the quality control method of such a cement composition, the fluid state may be a fluid velocity, and the measuring meter may measure the velocity of the cement composition flowing down the inclined portion.

[0026] According to such a quality control method for a cement composition, the fluidity of the cement composition can be evaluated based on the flow rate of the cement composition.

[0027] In the method for quality control of a cement composition, the measuring device is preferably a non-contact type Doppler sensor.

[0028] According to such a method for quality control of a cement composition, the flow rate can be easily measured.

[0029] In such a method for quality control 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.

[0030] According to such a method for quality control of a cement composition, a threshold value suitable for the supply rate can be set.

[0031] ===This 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.

[0032] The ready mixed concrete truck 10 is a vehicle that transports concrete materials delivered from a concrete manufacturing plant to a pouring site while mixing them. The ready mixed concrete truck 10 is equipped with a drum 12 and a chute 14 (corresponding to an inclined portion).

[0033] The drum 12 is a generally cylindrical container for loading ready mixed concrete (hereinafter, simply referred to as concrete). The drum 12 keeps rotating all the time while the ready mixed concrete truck 10 is traveling, kneading and mixing the concrete materials. This prevents separation of the aggregate and water, and keeps the concrete homogeneous.

[0034] The chute 14 is a member for guiding (discharging) the concrete in the drum 12 to a desired unloading position, and is provided with an incline behind the drum 12. The chute 14 of this embodiment is also provided with a measuring unit 30 (described later).

[0035] The pump truck 20 is a vehicle for pumping the concrete transported to the site by the ready-mix concrete truck 10 to a pouring location. The pump truck 20 includes a hopper 22, a pump 24, and a concrete supply pipe 26.

[0036] The hopper 22 is provided at the rear of the pump vehicle 20 and is disposed so as to face 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.

[0037] The pump 24 is, for example, a double-cylinder reciprocating pump, and generates hydraulic pressure to push out the concrete supplied from the hopper 22 to a cylinder (not shown) from the cylinder. The pump 24 then pumps the concrete in the cylinder into the concrete supply pipe 26 at high pressure.

[0038] The concrete supply pipe 26 is a tubular member that transports the concrete extruded from the cylinder by the drive of the pump 24 to the pouring location (such as a formwork).

[0039] 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 by driving a pump 24.

[0040] <About 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.

[0041] As shown in Fig. 2, the chute 14 of the ready-mix concrete truck 10 is provided with a measuring unit 30. This measuring unit 30 measures the flow state of concrete (in this embodiment, the flow state of concrete flowing through the chute 14). Note that the measuring unit 30 in this embodiment 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. Also, it may be attached to a member other than the chute 14.

[0042] 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. In explaining the position of each component in Fig. 2, the side on which the L-shaped angles 31 are arranged with respect to the chute 14 is defined as the upper side, and the opposite side is defined as the lower side.

[0043] 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 a steel member 352 (described later) of the probe 35 sandwiched between them, and are fixed 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.

[0044] The iron plate 32 is a long, thin flat plate and 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 along 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.

[0045] The magnetic stands 33 are members (holding tools) for fixing the laser displacement gauge 34 onto the iron plate 32, and are provided on both ends of the iron plate 32 in the longitudinal direction.

[0046] As shown in FIG. 3, the probe 35 (corresponding to the load detector and the obstacle) includes a cylinder 350, a steel material 351, a steel material 352, and a load meter 353 (corresponding to a measuring meter).

[0047] The cylinder 350 (corresponding to a cylindrical body) is a cylindrical member with a circular cross section. The cross section is not limited to a circular one, and may be a cylindrical member with another shape (for example, a triangle or a square). 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 becomes smoother. Furthermore, if the load meter 353 is not used and only the concrete height is measured by 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 or the like.

[0048] Steel material 351 is a member for attaching load cell 353 to the inner surface of cylinder 350. For this reason, in steel material 351, the surface facing cylinder 350 is provided in a shape (curved shape) that follows the shape of the inner surface of cylinder 350, and steel material 351 is fixed to the inner surface of cylinder 350. Note that when the cross section of cylinder 350 is not circular but is triangular or rectangular, and load cell 353 is to be attached to a linear portion (flat surface), load cell 353 may be attached directly without using steel material 351.

[0049] 3, the steel material 352 (corresponding to a plate member) is a plate-shaped member, and as shown in FIG. 3, the lower end side is disposed inside the cylinder 350, and the upper end side extends upward beyond the cylinder 350 and is fixed by being sandwiched between a pair of L-shaped angles 31. In other words, the steel material 352 is fixed to the chute 14.

[0050] 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 according to the pressure. In other words, the load meter 353 measures the load of the concrete flowing through the chute 14 (corresponding to the flow load).

[0051] 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 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.

[0052] 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 by receiving the laser emitting from the laser emitting unit and reflected by the object with the reflected laser receiving unit. In this embodiment, the laser displacement meter 34 measures the top height of the concrete flowing through the chute 14 (corresponding to the flow height).

[0053] 4A to 4C are explanatory diagrams of a method for measuring the height of the top end of concrete using the laser displacement meter 34. FIG.

[0054] As shown in Fig. 4A, measure the distance between each laser displacement meter 34 and the bottom of the chute 14 when no concrete is flowing in the chute 14. In Fig. 4A, the distances (measured values) are d1 both on the upstream side (laser displacement meter 34A) and the downstream side (laser displacement meter 34B).

[0055] As shown in Fig. 4B, when concrete is flowing in the chute 14 and the slump is large, the concrete flows like a soft liquid. For this reason, the load received by the probe 35 is small, and the top height of the concrete becomes low. In Fig. 4B, the measured value on the upstream side (laser displacement meter 34A) is d2 (< d1), and the measured value on the downstream side (laser displacement meter 34B) is d2' (< d1). In this case, the top height of the concrete is obtained as d1 - d2 on the upstream side and d1 - d2' on the downstream side. When the slump is large, as shown in Fig. 4B, the difference between the measured value (d2) on the upstream side and the measured value (d2') on the downstream side is small, and the difference between the top height on the upstream side and the top height on the downstream side is also small.

[0056] 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 the concrete tends to accumulate in front of the probe 35 (the upstream side of the flow). For this reason, the load received by the probe 35 is large, and the top height of the concrete in front of the probe 35 (the upstream side) becomes high. In Fig. 4C, the measured value on the upstream side (laser displacement meter 34A) is d3 (< d3') with respect to the measured value d3' (< d1) on the downstream side (laser displacement meter 34B). Also in this case, the top height of the concrete is obtained as d1 - d3 on the upstream side and d1 - d3' on the downstream side. When the slump is small, as shown in Fig. 4C, the measured value (d3) on the upstream side is smaller than the measured value (d3') on the downstream side. That is, the top height on the upstream side tends to be high.

[0057] Although not shown here, a Doppler type non-contact flow meter (for example, RYUKAN WJ7661 manufactured by Yokogawa Electronics Corporation) 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 it cannot be placed perpendicularly, a correction can be made.

[0058] The outputs of the load meter 353 and the laser displacement meter 34 (and the non-contact type current meter) are 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 generation unit that generates a warning by sound, light emission, etc. The terminal device manages the measured data and generates a warning when the measurement value reaches a predetermined value (threshold value).

[0059] <Relationship between slump and various measurement data> FIG. 5A is a diagram showing an example of each piece of measurement data when the slump is large (here, 24.5 cm), and FIG. 5B is a diagram showing an example of each piece of measurement data when the slump is small (here, 9 cm).

[0060] 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 a measurement value obtained by the load meter 353 of the probe 35, and the height is a 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 a value measured by a Doppler-type non-contact flow meter or the like for the concrete flowing through the chute 14.

[0061] When the slump is large, the concrete is soft and easy to flow, so the load is small, the height is low, and the flow rate is fast, as shown in Figure 5A.

[0062] In contrast, when the slump is small, the concrete becomes hard, and the load (the force that the load meter 353 of the probe 35 receives from the concrete) becomes large. It can also be seen that the height is higher than in Fig. 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 slower than in Fig. 5A.

[0063] FIG. 6 is a diagram showing the relationship between slump and load, and FIG. 7 is a diagram showing the relationship between slump and concrete top height. FIG. 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). FIG. 8 is a diagram showing the relationship between the slump and the flow velocity of the concrete, and FIG. 9 is a diagram showing the relationship between the top height of the concrete and the load. Each diagram shows the measurement results for each pumping speed. 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-mixed 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-mixed concrete truck 10 to the pump vehicle 20. In other words, the higher the value of the pumping speed, the higher the supply speed of concrete from the ready-mixed concrete truck 10 to the pump vehicle 20.

[0064] 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 load increases as the pumping speed (supply speed) increases.

[0065] As shown in Figure 7, when the slump is large, the concrete top height is low, and when the slump is small, the concrete top height is high. Also, the higher the pumping speed (supply speed), the higher the concrete top height.

[0066] As shown in Fig. 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 speed) 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.

[0067] Also, from Figure 9, we can see that there is a correlation between height and load. In other words, the flow state of concrete can be measured by only either load or height. Also, from Figures 5A and 5B, we can see that there is a correlation between flow velocity and load and height.

[0068] As such, because 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, subsequent measurement values ​​can be converted (corresponded) to slump values.

[0069] <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.

[0070] FIG. 10 is a flow diagram of a method for controlling the fluidity of concrete (a quality control method) in a comparative example.

[0071] First, an order for concrete is placed (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 or 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 a predetermined standard. 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).

[0072] If the acceptance inspection is passed (YES in S203), concrete pouring is started using the ready-mix concrete truck 10 and the pump truck 20 (S205). In addition, a slump test is performed at 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 or 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), the concrete is poured and a slump test is performed at appropriate timing. If it is determined in step S208 that pouring of the concrete is complete (YES in S208), pouring of the concrete is terminated.

[0073] 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 allocation of dedicated personnel.

[0074] (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 (for example, 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.

[0075] Steps S101 to S105 correspond to steps S201 to S205 in the comparative example, respectively, and therefore a description thereof will be omitted. In this embodiment, when the ready-mixed concrete truck 10 arrives at the site, the measuring unit 30 is attached to the chute 14 of the ready-mixed concrete truck 10 (S106). Note that the measuring unit 30 may be attached to the chute 14 of the ready-mixed concrete truck 10 in advance. Furthermore, 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).

[0076] At the same time as concrete pouring starts, measurement of the waveform by the load meter 353 starts (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 a threshold value setting step). For example, as shown in FIG. 6, since the load and the slump have a roughly linear relationship, if data is accumulated, a 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 a memory unit of a 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.

[0077] Thereafter, the fluidity (here, the load) of the concrete flowing through the chute 14 is 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 (for example, 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) (corresponding to S111: determination step). When the measured value reaches the threshold (for example, a value corresponding to a slump of 9.0) (NO in S111), the terminal device issues a warning such as emitting a sound. If this warning is given (YES in S112), step S104 is executed to return and discard the remaining concrete.

[0078] If the measured value does not reach the threshold value in step S111 (YES in S111) or if there is no warning in step S112 (NO in S112), it is determined whether pouring is complete (step S113). If pouring is not complete (NO in S113), the process returns to step S110 and measurement and comparison are continued. On the other hand, if pouring is complete (YES in S113), pouring and measurement of concrete ends.

[0079] As described 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 the quality of the concrete by comparing the output of the load meter 353 with the threshold value.

[0080] This allows the fluidity of concrete (in this example, the load) to be measured automatically, making it possible to manage the fluidity of concrete in real time.

[0081] In this embodiment, the case where the load of concrete flowing through the chute 14 of the ready-mix concrete truck 10 is measured 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.

[0082] ===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 may 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.

[0083] In the above embodiment, the fluidity of concrete is controlled, but the present invention is not limited to this and can be applied to other cement compositions (for example, mortar).

[0084] In addition, in the above 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 may be made by pouring concrete through an inclined member. For example, a member having an inclined surface (corresponding to the inclined portion) may be placed between the chute 14 of the ready-mix concrete truck 10 and the hopper 22 of the pump truck 20, and the measuring unit 30 may be provided on the member to measure the flow state of concrete flowing through the inclined surface.

[0085] In the above embodiment, the laser displacement meter 34 for measuring the concrete height is provided on the upstream side of the probe 35, and on the downstream side of the probe 35, but at least the laser displacement meter 34A is sufficient. However, if the laser displacement meter 34 is provided on both the upstream side and the downstream side of the probe 35 as in this embodiment, the accuracy of the evaluation can be improved. Also, three or more laser displacement meters 34 may be provided (for example, an additional laser displacement meter may be provided between the probe 35 and the laser displacement meter 34B). [Explanation of symbols]

[0086] 10 ready-mix concrete trucks, 12 drums, 14 chutes, 20 Pump truck, 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 (measurement meter), 34A Laser displacement meter, 34B Laser displacement meter, 35 Probe (load detection part, obstacle), 350 cylinder (cylindrical body), 351 steel material, 352 steel material (plate member), 353 Load cell (measuring meter),

Claims

1. 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:

2. A method for quality control of the cement composition according to claim 1. The cylindrical body is a cylinder. A method for quality control of a cement composition comprising the steps of:

3. 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:

4. A method for quality control of the 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:

5. A method for quality control of 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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