JPH0119541B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for calculating the consistency value of unhardened concrete during the stirring process of mixed raw materials, and an apparatus therefor. The most important characteristic of unhardened concrete is its consistency, which is expressed by the degree of softness caused by the amount of water. The appropriate consistency of concrete depends on the type of structure,
Dimensions of members, placement of reinforcing bars, transportation of concrete,
It varies depending on the construction situation, such as the method of driving and compaction. The most commonly used method for measuring consistency is the slump test method. Slump test method is JIS A1101
stipulated in. As is well known, the slump test is a method in which unhardened concrete is packed into a slump cone and the cone is pulled out, and the fall of the top is measured in cm to obtain the slump value (cm). The slump value is generally a good indication of the consistency of the unset concrete. However, this is not an appropriate display method for concrete with a slump value of 1 or less or 0. For this reason, various methods have been proposed for obtaining numerical values for determining consistency based on changes in the state caused by applying vibrations to the concrete in the cylinder, and measuring instruments for these methods are also commercially available. One such method is the VC value test method, which is a method for measuring the consistency of concrete used in the RCD construction method (roller compacted dam construction method).
In addition, VB is taken up as a road corporation standard.
There are value test methods and methods being considered by the Japan Society of Civil Engineers. Consistency is a complex property, and the values obtained by the test method described above are obtained by capturing consistency from a certain aspect, so they do not completely indicate consistency, but they can be used for a certain purpose and range. It can be said that each of these values represents consistency without any practical problems. Consistency varies depending on the formulation raw materials;
The consistency can be maintained by stirring for approximately 30 seconds to 1 minute depending on the type of stirrer. If the mixed raw materials are constant, the consistency value of concrete that has not hardened will change at a constant rate depending on the mixing ratio, so in ready-mixed concrete manufacturing plants, the consistency value of each type of mixed raw material, such as the slump value, is The ratio relationship is calculated and displayed in detail, and by mixing based on the table, it is possible to obtain unhardened concrete with a desired slump value. In addition, in most modern ready-mixed concrete manufacturing factories, automatic mixing is performed, and raw materials are automatically mixed by inserting a punch card with the desired design values into the mixing control mechanism, and the desired slump value and amount are automatically mixed. It is now possible to obtain concrete that has not hardened yet. However, the recipe table is based on the use of surface-dried aggregate, and although the actual surface water content of the aggregate is measured and corrections are made based on this, the slump value as designed may not be obtained. The slump value of fresh concrete can be estimated relatively accurately by visual observation by a skilled worker, but this visual judgment can only be made after stirring is finished and the concrete is discharged from the stirring device. Therefore, fresh concrete that cannot achieve a predetermined slump value has no choice but to be discarded. Therefore, it is desired to be able to estimate the slump value of unhardened concrete obtained during the stirring process of mixed raw materials. It is easy to imagine that the slump value is correlated with the amount of current or power input to the stirrer for stirring the mixed raw materials, and it has been recognized for a long time, and based on this, the slump of concrete that has not hardened can be estimated. Various attempts have also been made to do so. In other words, unhardened concrete with a small slump value has low fluidity and requires a lot of power during the stirring process.If the slump value is large, the opposite should be true, and the amount of current or power input for stirring is low. This is inevitably related to the slump value of the unhardened concrete obtained. However, due to the structure of the agitator, the required power fluctuates significantly depending on the phase during one revolution of the rotary blade, and does not necessarily decrease gradually, but decreases while increasing and decreasing irregularly. Therefore, in the conventional method of estimating the slump value based on the input amount, the input amount is obtained by minimizing vibration by using a smoothing circuit or a delay smoothing circuit, etc., and the slump value is estimated from this. is taken. However, the input values obtained by smoothing in this manner are generally uniform values, and do not correspond to fluctuations in the expected slump value based on the raw material formulation. Although a method of enlarging the input value has also been proposed, it is not possible to obtain an input value that correlates with the slump value for the reasons described above. In actual mixing work for mixed raw materials, workers often start stirring at a mixing ratio that is harder than the set value, and then finish the stirring work by adding water while checking the amount of current or electricity based on the intuition of the worker. . However, since this is a work that relies on the intuition of the operator, the desired slump value is often not obtained.
Above, we have described the case where the slump value is used as a value indicating the consistency of concrete that has not hardened yet, but of course the same applies to the case where other consistency values such as VC value, VB value, etc. are used. Furthermore, in the past, it was only possible to know the amount of current or electric power required to operate the stirrer until the material was fed into the stirrer and the raw material was discharged after stirring started, and it was not possible to know anything about the state of the kneaded material. I can't get any information at all. Therefore, during this time, the workers have no choice but to wait with their hands tied, and are unable to take any action even if the mixture is not being stirred toward the designed consistency value. An object of the present invention is to provide a method and apparatus for calculating with high precision the consistency value of concrete that has not yet hardened during the stirring process of mixed raw materials. The method for calculating the consistency value of concrete that has not hardened yet according to the first aspect of the present invention includes, in the stirring process of mixed raw materials, calculating the amount of work for stirring by classifying the number of rotations appropriate for the stirring device used, Then, calculate the substantial segmented workload for kneading excluding the segmented workload during no-load, and calculate the continuous effective segmented workload W _i-3 , W _i- after a certain time has elapsed from the start of kneading. ₂ , W _i-1 and W _i , W _i-3 ≧W _i-2 ≧W _i-1 (1) α≧｜W _i-1 −W _i ｜ (2) [However, α is the consistency The stability width judgment value is determined based on the tolerance of the tension value. ] When the formula holds, the last of the four substantive categorical workloads is set as the target categorical workload, and based on the combination of two or more target categorical workloads and consistency values determined in advance. In this method, a correlation equation between the two is obtained, and a consistency value corresponding to each target division workload in the stirring process is calculated using the correlation equation. The consistency value calculation device for concrete that has not hardened yet according to the second aspect of the present invention integrates the input amount to the stirring device for each set period corresponding to an appropriate number of rotations according to the stirring device, and means for calculating the amount of work for each section, a means for subtracting the amount of work for each section before the start of kneading from the amount of work for each section after the start of kneading, calculating the actual amount of work for each section, and storing this; Find out the amount of work divided by target,
Continuous 4 after a certain period of time from the start of kneading
Regarding the actual partitioned workload W _i-3 , W _i-2 , W _i-1 , W i , W _{i -3} ≧W _i-2 ≧W _i-1 (1) α≧｜W _i-1 −W _i | (2) [However, α is the stable price range judgment value obtained based on the tolerance of consistency values. ] Determine whether the formula holds true or not, and if the formulas (1) and (2) hold, set the last practical work load W _i of the four practical work loads to the target class. A correlation formula is calculated between the two by combining a means for determining the amount of work, a consistency value of the kneaded material at the time when the target categorical workload is determined and determined in advance, and the target categorical workload. and means for calculating a consistency value corresponding to each target division work in the stirring process of mixed raw materials based on the correlation formula. In a preferred embodiment of the method and apparatus of the first and second aspects of the present invention, the consistency value is a slump value or a VC value determined by a shaking table method. The method and apparatus of the present invention will be described in detail below. In short, the present invention selects an appropriate number of rotations depending on the type and style of the stirrer used in the stirring process of the raw materials, determines the continuous work for each section divided by the number of rotations, and starts kneading. After a certain period of time has elapsed, a consistency value corresponding to each substantial sectional workload is calculated.
In the following description, the slump value will be used as the consistency value. An example of the input amount f(A) to the stirrer during the stirring process of the raw materials is a curve with many irregularities as shown in FIG. Until the start of kneading, it moves at a generally constant value with few irregularities, and after the start of kneading, it rises with severe irregularities, then gradually decreases as the irregularities decrease and descends, and finally reaches a substantially constant value with few irregularities, and the kneading is completed and discharged. In the present invention, an appropriate number of rotations N is selected depending on the type of stirrer, etc., and the segmented work load TW _i of the stirrer for each time T _CL required for this is determined. TW _i is calculated using the following formula. TW _i =∫ ^ni+N _oi f(A)dn (3) [n _i indicates the starting position of each rotational displacement of the stirrer during the calculation of segmented work. ] Figure 1 shows the segmented work load TW _i in relation to the input amount f(A) to the stirrer. As shown in FIG. 1, the amount of work for each section before the start of kneading, that is, when there is no load, is smaller than that after the start of kneading. Therefore, in order to make the segmented workload unaffected by the aging of the mixer and related to the slump value, the segmented workload TW′ at no load was excluded from the segmented workload TW _i after the start of kneading. Find the actual sectional workload W _i . W _i =∫ ^ni+N _oi f(A)dn−TW' (4) At the start of kneading, the origin of the calculation clock is moved. The operation of the control circuit that controls this will be explained with reference to the block diagram of FIG. If the kneading start signal is received during the operation of the calculation clock that calculates the segmented work TW' at no-load in the no-load state, the operation of the calculation clock is cleared and the equation (3) calculated at that point is Also clear the contents of. Thereafter, the calculation clock automatically starts operating with the kneading start signal reception point as the origin, thereby starting the calculation of equation (4). This arithmetic clock continues its operation until the next kneading start signal is received. The calculation of equation (4) is canceled by a reset signal. Actual categorical workload
W _i is stored sequentially. At this time, an appropriate method is used to calculate the segmented workload TW' under no load depending on the type of stirring device, etc. For example, if the variation in the segmental workload during no-load is small, when measuring TW′ _i during no-load, the segmental workload sequence TW′ _io ~TW′ i that was previously measured and stored _{is -1} is rewritten to TW′ _i-o+1 ~ TW′ _i , and when a kneading start signal is received while measuring TW′ _i+1 (TW′ _i-o+1 +…+TW′ _i )/ n is computed and stored as the segmented workload TW' at no load. In addition, in tilting type mixers, etc., the remaining material inside the mixer moves the center of gravity of the entire mixer, so even if the sectional work during no-load changes, the target sectional workload will not change. Measure and find the sectional work at no load when the inside of the mixer is being cleaned, and convert that value into a constant to calculate the sectional work at no load.
Let it be TW′. Next, determine whether the kneading has stabilized. For this determination, it is necessary that the following conditions (1) and (2) are satisfied after a certain period of time has passed since the start of kneading. W _i-3 ≧W _i-2 ≧W _i-1 (1) α≧｜W _i-1 −W _i ｜ (2) [However, W _i-3 , W _i-2 , W _i-1 , W _i is the continuous four-part substantial work load, and α is the stability width judgment value determined based on the tolerance of the JIS standard slump. ] The range in which kneading can be judged to be stable is the range between A and B in FIG. 3, and the last segmented workload W _i is set as the target segmented workload. The range in which kneading can be judged to be stable is determined by actual measurement in advance by W _i ,
By measuring W _i+1 ,...W _i+o |W _i+o-1 −
W _i+o ｜≦α is confirmed and set. Here, the stability width judgment value α will be explained. In a normal mixer, W _i almost stays at a constant value within a range where kneading is judged to be stable. It is meaningless from an economical and technical point of view to continue the kneading operation until the value converges to a constant value, so it is necessary to complete the kneading operation at a time deemed appropriate. Therefore, the stability width judgment value α is used. The target segmental workloads for which the slump values are SL ₁ and SL ₂ are W _i1 and W _i2 , respectively, and if SL ₁ −SL ₂ > 0, then W _i2 − W _i1 > 0, which can be obtained from equation (5). SD
The value is the resolution of the slump value. SD=W _i2 −W _i1 /SL ₁ −SL ₂ (5) That is, the SD value in equation (5) is the amount of change in the segmental work per 1 (cm) of slump value. In the technique of actually measuring slump values, the fraction below the decimal point of the slump value is uncertain, but in the case of visual comparison inspection, an expert can discern a difference in slump value of about 0.5 (cm). Therefore, since the above-mentioned fluctuation range of the segmental work TW' during no-load is very small, it is natural that when the consistency value measurement error is set to 1/2 or less of the slump resolution SD, as long as the kneading is stable (2) Since the difference between the actual sectional workloads in equation (2) is less than 1/2SD, by setting the stability width judgment value α to 1/2SD, α≧｜ in equation (2)
It is possible to judge the success or failure of W _i-1 −W _i |. Incidentally, since the variation range of the segmented workload TW' during no-load is very small, the stability range judgment value α can be made even smaller, for example, 1/4 SD. In addition, since the amount of change in the categorical workload itself can be grasped by categorizing it to a value of about 1/10SD, the accuracy of the method of the present invention can be improved by measuring the categorical workload precisely to a value of about 1/10SD. can be improved. In addition, regarding the tolerance of slump value, according to JIS, if the specified value is less than 3 cm, ±1
cm, ±1.5cm if 3cm or more and less than 8cm, ±2.5cm if 8cm or more and less than 18cm, ±2.5cm if more than 18cm
It is stipulated that the distance must not exceed 1.5 cm. A combination of two sets of slump measurement values SL ₁ and SL ₂ of the kneaded material, which are the target classification work W _i1 and W _i2 for calculating the SD value of the slump resolution mentioned above, or a combination of these by adding more combinations. Find the correlation equation between the sectional workload and the slump value. SL _i =SL _p +W _p −W _i /SD (6) Here, SD is the aforementioned slump resolution, W _p ,
SL _p is the classification work of a reference set (W _i1 and SL ₁ is also acceptable) and the slump value of the kneaded material at that time,
SL _i is the estimated slump value of the kneaded material when the sectional work is W _i . In the method of the present invention, the sectional work is calculated and displayed in the stirring process of the mixed raw materials, and the slump value corresponding to each sectional work is calculated and displayed from the correlation equation (6). In this way, the operator can recognize the state of the kneaded material in the stirring device as a slump-equivalent value. Moreover, this slump equivalent value changes over time in the same manner as the W _i value shown in FIGS. 1 and 3, and tends toward the design slump value. Therefore, a skilled operator can easily determine from experience whether the slump value of the kneaded product can reach the designed value based on the slump equivalent value during stirring and its change over time. Therefore, it is possible to make ready-mixed concrete whose slump value is adjusted to the designed value by adding raw materials, etc. so as not to change the properties of the ready-mixed concrete during mixing, if necessary.
This can greatly avoid situations where defective products have to be discarded. In a ready-mixed concrete manufacturing factory, the slump value due to mixed raw materials and the target real classification work value for each mixing amount (for example, 0.5 to 1.5 m ³ ) are determined in advance for each mixer used by experiments, or the actual values are stacked and displayed. put. As mentioned above, most ready-mixed concrete manufacturing plants carry out automatic mixing, and the control panel for ready-mixed concrete production is generally equipped with a capacity change function to determine the amount of mixing and a punch card reader to instruct the mixing. A punched card with a card number H (usually a 3-digit decimal number) written in it and a combination value punched into the punched card reader is inserted. Therefore, on this punch card, M
The target classification work value W _ij when the slump according to the design value is obtained by kneading m ³ is written as M=W _ij on the card. When producing ready-mixed concrete using the same card, if the target category work value is W, the operator of the control panel compares W with W _ij written on the punch card to determine the slump value. can do. That is, if W _ij =W, it means that the slump value as designed value has been obtained. If W>W _ij , the slump value is small, and if W<W _ij , the slump value is large. Also, as mentioned above, if the amount of work for each category in the stirring process is calculated and displayed as the corresponding slump value,
The slump value corresponding to the workload when the target classification workload value is reached is displayed, and the slump value indicates the slump value of the kneaded material at that time.
There is no need to compare it with the W _ij value on the punch card. Next, a specific embodiment of the apparatus of the present invention will be explained based on the block diagram of FIG. A series of operations are performed by a previously created calculation program. If the input amount is a current amount, it is input from the main line of the mixer motor through a current transformer. This is usually less than 5A, so
This value is normally converted into a voltage value (or a current value in some cases), amplified through a rectifier circuit that does not cause waveform distortion, and input to the integrating circuit of the segmented work calculation circuit. If the input amount is power consumption, it is passed from the main line of the mixer motor to a current transformer, a transformer, a transducer that calculates and outputs the power consumption, and is further amplified and input to the integration circuit as a voltage or current value. . The input amount is integrated for each set period corresponding to an appropriate number of rotations N depending on the stirring device. For this purpose, the operation of resetting every N rotations is performed by an arithmetic clock. The calculation clock is determined by the value of the time setter _TCL required for mixer N rotation, the calculation program, and the mutual operation of the storage register. This is illustrated in the flowchart of FIG. Each divisional workload calculation circuit performs calculation and storage according to a calculation program and is controlled by a control circuit. Each time a clock pulse is input from the value set in the time setter _TCL , it is decremented (-1 operation). The arithmetic clock is oscillated every time the content of M _p becomes zero. If no kneading start signal is input, the integral value is processed as follows. When the arithmetic clock hits and the next arithmetic clock arrives, the value shown in equation (3) is stored in memory register _M1 . This value is further input by the next arithmetic clock (1)
It is designed so that it can be rewritten to the value of the expression, and this value is designated as TW′ _i . When the kneading start signal is received, the integration circuit is reset, and the contents of address _Mp are rewritten to _TCL . This operation is a movement of the origin of the arithmetic clock. This operation is necessary in order to provide reproducibility to the sectional work values. A kneading start signal and a reset signal are input from the control circuit. In the segmented workload calculation circuit, the segmented workload TW _i is calculated based on equation (3). The TW _i value signal is outputted to the substantive sectional work calculation circuit and displayed as display 1. The TW′ _i value signal at no-load is also input to the no-load classification workload calculation circuit,
Here, the segmented workload TW′ at no load is calculated. In the practical piecewise work calculation circuit, the input TW _i
From the and TW′ signals, the effective segmental work
W _i is calculated, displayed as display 2, and stored. The W _i signal is also input to the consistency value conversion circuit. On the other hand, the necessary number of conversion setter groups and selection circuits are prepared depending on the amount of kneading and the type of mixture.
Each conversion setter is called by a selection circuit in response to a conversion setter group selection signal calculated and output based on the kneading amount and blend type. In the consistency value conversion circuit, the W _i value is converted into a consistency value such as a slump value, VB value, or VS value using a conversion formula from a selected conversion setting device, for example, the correlation formula of equation (6) in the case of a slump value. It is converted into a tenancy value and displayed as display 3. In the target classification workload judgment circuit, W _i
The value is extracted and judgment is made using equations (1) and (2). The α value signal of equation (2) is inputted to this circuit from the stability width judgment value setter. The target categorical workload determining circuit determines the target categorical workload using equations (1) and (2), and displays the value as display 4. In addition, the control circuit displays as display 5 the number of divisional work calculations with the kneading start signal as the origin. That is, it is incremented by 1 from 0 every time _TCl .
It is also convenient to display the kneading time set in the control circuit by subtracting the number in cycle pulses from the kneading start signal on the display 5, as a function of the conventional kneading timer. Further details of the configuration and operation of the device of the present invention are within the scope of electronic engineers who can easily select and implement them as appropriate, and therefore detailed explanations will be omitted. Next, examples of the method of the present invention will be described. 1.5 m ³ of fresh concrete was mixed using an inclined mixer. The implementation status of the kneading work was as follows. Stirrer rotation speed 1/5rps Design slump value 8 (cm) Stirrer work classification Every 5 seconds Slump value resolution SD value and the experimental results to find the correlation formula between the classification work and slump value are shown in the table below. It was hot on the street.

[Table] Note that the sectional work load does not need to be an accurate unit value such as Kg-m, and may be a comparative value based on a fixed standard for each stirring device. For example, when the stirrer power is proportional to the current value, a value obtained by integrating the current value over time is used. Slump value resolution SD and estimated slump value SL _i
is calculated using equations (5) and (6) as follows. SD = 33-15/18-6 = 18/12 = 1.5 SL _i = 6 + 33- _W i /1.5 = 28-W _i /1.5 The changes over time in the actual segmented workload and the corresponding slump value are shown in Figure 6. It was hot. In addition, punch cards have a slump value of 8 according to experiments.
The design category work corresponding to is stated as 30±1.5, and the judgment was made using the stability width judgment value α=0.75. The actual amount of sectional work decreases sequentially from 35 seconds after the start of kneading, and the actual sectional work for 75 to 80 seconds is 30.5, and the difference from the actual sectional work for the previous 5 seconds is
It was within 0.75, and the operation in display 4 was judged to be the target category work amount. This target class work load was compared with the design class work load of 30±1.5, and it was confirmed that the target ready-mixed concrete was obtained. Furthermore, since the slump corresponding values as shown in FIG. 6 were displayed, the worker expected from his experience that the reached slump value would almost match the design slump value. The method and apparatus of the present invention are configured and implemented as described above, and can calculate the consistency value of unhardened concrete with high accuracy during the mixing process of mixed raw materials, so they have extremely high industrial utility value. It is. That is, in the past, the amount of current or the amount of power consumption was used to estimate the slump value of fresh concrete obtained during the stirring process, and it was not possible to estimate a sufficient slump value. In addition to calculating the amount of work divided into sections, the actual amount of work done in each section is calculated by subtracting the amount of work done in each section when there is no load, and the target amount of work in each section is set just before the change over time of this actual amount of work in each section becomes a constant value. Since the consistency value of each target division work in the stirring process is calculated using the correlation formula between the target division work and the consistency value determined in advance, the accuracy is high and it does not affect the kneading time. There is no. Furthermore, in the method and apparatus of the present invention, the state of the kneaded material in the stirring device after raw material input until discharge can be known as a consistency conversion value, and this consistency conversion value increases once at the start of kneading. The consistency value should drop gradually, stabilize the kneading, and match the design consistency value, so it is possible for workers to estimate the reached consistency value empirically based on this consistency conversion value and the status of this change over time. Further, at this stage, it is possible to adjust the achieved consistency value by adding water, raw materials, etc. so as not to change the characteristics of the fresh concrete, and it is possible to prevent the discharge of defective mixed products. In addition, most modern ready-mixed concrete manufacturing factories use automatic mixing, so even if the consistency conversion value during mixing is not known as described above, the punch cards used for this process are By recording the set category work value corresponding to the consistency value, the operator can easily determine the consistency value of ready-mixed concrete to be reached by comparing this with the target category work value obtained. can.

[Brief explanation of drawings]

Figure 1 is a diagram showing the amount of input to the stirrer during the stirring process of mixed raw materials and the change over time in the amount of work of the stirrer, and Figure 2 shows a part of the operation of the computer that implements the method of the present invention. Example of block diagram, 3rd
FIG. 4 is a block diagram of an electric circuit of an embodiment of the apparatus of the present invention, and FIG. 5 is a flowchart showing the operation of the arithmetic clock. , FIG. 6 is a diagram showing an example of the change over time in the substantial sectional workload and the corresponding slump value. f(A)……Input amount to the stirrer, TW _i , TW′, W _i
...Divided work load of the stirrer.

Claims (1)

[Scope of Claims] 1. In the process of stirring raw materials, the amount of work for stirring is calculated by dividing the number of rotations appropriate for the stirring device used, and the amount of work for mixing excluding the amount of work for each section when no load is applied. After a certain period of time has elapsed since the start of kneading, the actual sectional work for the four successive sectional workloads W _i-3 , W _i-2 , W _i-1 , W _i is calculated as follows: W _i-3 ≧W _i-2 ≧W _i-1 (1) α≧｜W _i-1 −W _i ｜ (2) [However, α is the stability width judgment obtained based on the tolerance of the consistency value value. ] When the formula holds, the last of the four substantive categorical workloads is set as the target categorical workload, and based on the combination of two or more target categorical workloads and consistency values determined in advance. A method for calculating a consistency value of concrete that has not yet hardened, characterized in that a correlation equation between the two is calculated using the correlation equation, and a consistency value corresponding to each target classification work in the stirring process is calculated using the correlation equation. 2. The method of calculating a consistency value of concrete that has not yet hardened as claimed in claim 1, wherein the consistency value is a slump value. 3 The consistency value is determined by the shaking table method.
A method for calculating a consistency value of unhardened concrete according to claim 1, which is a VC value. 4. Means for integrating the input amount to the stirring device for each set period corresponding to the appropriate number of rotations according to the stirring device, and calculating the segmented workload for each set period, and from the segmented workload after the start of kneading. Means for subtracting the sectional work before the start of kneading to calculate the substantial sectional work and storing it; and means for retrieving the memorized substantial sectional work and continuously performing four continuous operations after a certain period of time has elapsed from the start of kneading. Actual divisional work W _i-3 , W _i-2 ,
For W _i-1 and W _i , W _i-3 ≧W _i-2 ≧W _i-1 (1) α≧｜W _i-1 −W _i ｜ (2) [However, α is the allowable consistency value Stability width judgment value calculated based on the difference. ] Determine whether or not the formula holds true, and if the formulas (1) and (2) hold, set the final class work W _i of the four actual work volumes as the target class work. and a means for calculating a correlation equation between the two by combining a plurality of sets of the consistency value of the kneaded material at the time of determination of the target classification work amount obtained and inputted in advance, and the target classification work amount. and a means for calculating a consistency value corresponding to each target classification work amount in the stirring process based on the correlation formula. 5. The consistency value calculation device for unhardened concrete according to claim 4, wherein the consistency value is a slump value. 6 The consistency value is determined by the shaking table method.
The apparatus for calculating the consistency value of unhardened concrete according to claim 4, which is a VC value.