Method and system for calculating yield stress of a slurry based on slump

Abstract

The present application provides a method and system for calculating the yield stress of slurry based on slump degree, which divides the target slump body into two parts, upper slump body and lower slump body, and calculates separately. The upper slump body is calculated by using Tresca criterion, and the lower slump body is calculated by using lubrication theory. The calculation method proposed by the present application is applicable to different sizes of circular cone and cylindrical slump degree cylinders. Only different calculation formulas need to be selected according to the conditions, which increases the application range of the calculation method and further facilitates the popularization and application of the yield stress calculation based on slump degree.

Description

Technical Field

[0001] This invention belongs to the field of slurry yield stress calculation, and specifically relates to a method and system for calculating slurry yield stress based on slump. Background Technology

[0002] The evaluation of the fluidity of high-concentration slurries is a crucial issue in the fields of concrete and mine backfilling. Yield stress is a key parameter characterizing the fluidity of such slurries. While traditional rheometer methods can directly obtain the relationship between shear stress and shear rate, they require sophisticated equipment, making them difficult to apply in many mines and hindering large-scale fluidity analysis. Slump tests, due to their simple equipment structure, low cost, easy control, and labor savings, are widely used in many fields. The difference between the height of the slump center and the height of the slump cone is the slump. Scholars have attempted to construct a relationship between slump values ​​and yield stress, conducting extensive work from both mechanical analysis and experimental perspectives. However, the relevant models remain immature, unable to accurately characterize the correlation between slump values ​​and yield stress, and their applicability to slump cones of different shapes is also limited.

[0003] Traditional methods for converting slump to yield stress are mainly based on the Tresca criterion, which can lead to incorrect predictions of the cross-sectional shape of the lower collapsed body, resulting in inaccurate yield stress calculations. Summary of the Invention

[0004] This application aims to at least partially solve one of the technical problems in related technologies. An embodiment of the present invention provides a method for calculating the yield stress of slurry based on slump, as follows:

[0005] A method for calculating the yield stress of slurry based on slump includes the following steps:

[0006] S1. Obtain the slurry density ρ and slump value h;

[0007] S2. Obtain the slump cone shape parameters:

[0008] When the slump cylinder is cylindrical, obtain the radius r. n and height H;

[0009] When the slump cone is frustum shaped, obtain the radius r of the lower base of the slump cone. b slump cylinder upper bottom radius r t and slump cone height H;

[0010] S3. Divide the target collapse body into upper collapse body and lower collapse body;

[0011] S4. Based on the shape of the slump cone, obtain the volume V of the slump cone;

[0012] S5. Set the initial value τ of the yield stress. y =0;

[0013] S6. Increase the yield stress, i.e. Where Δτ is the increment of the yield stress. The increased yield stress:

[0014] S7. Set the bottom height h of the upper collapsed body. b =0;

[0015] S8. Increase the bottom height of the upper collapsed body, that is... Where Δh is the increment of the bottom height of the upper collapsed body. This is to increase the bottom height of the upper collapsed body;

[0016] S9, Based on the Tresca criterion and the increased yield stress The height h of the upper collapsed body is obtained. u and the volume V of the upper collapsed body u Based on lubrication theory and the increased bottom height of the upper collapse body The volume V of the lower collapsed body is obtained. t ;

[0017] S10, when V u +V t <V, then Proceed to step S8;

[0018] Otherwise, h c =h u +h t h c The predicted height of the target collapse body is output at the yield stress. The slump value h p =Hh c ;

[0019] S11, when h p When <h, then Then proceed to step S6;

[0020] Otherwise, output the yield stress value at this time. The yield stress of the slurry in the target collapsed body is given.

[0021] Preferably, the step S3 of dividing the target collapse body into an upper collapse body and a lower collapse body includes:

[0022] For a frustum slump cone, the portion of the target slump that still retains the shape of a frustum is classified as the upper slump; for a cylindrical slump cone, the portion of the target slump that still retains the shape of a cylinder is classified as the upper slump.

[0023] The deformed or flowing portion at the bottom of the target collapse body is classified as the lower collapse body.

[0024] Preferably, step S4, obtaining the volume V of the slump cone based on its shape, includes:

[0025] When the slump cone is a cylindrical slump cone, the radius r of the slump cone is... n The volume V of the slump cylinder is obtained by combining the height H of the slump cylinder.

[0026] When the slump cone is a frustum-shaped slump cone, the radius r of the lower base of the slump cone is... b The upper bottom radius r of the slump cylinder t The volume V of the slump cylinder is obtained by combining the height H of the slump cylinder.

[0027] Preferably, the S9 is based on the Tresca criterion and the increased yield stress. The height h of the upper collapsed body is obtained. u and the volume V of the upper collapsed body u Based on lubrication theory and the increased bottom height of the upper collapse body The volume V of the lower collapsed body is obtained. t include:

[0028] When the slump cone is a frustum, the height h of the upper slump body is... u The calculation formula is formula (1):

[0029]

[0030] Where λ=Hr b / (r b -r t ), where g is the acceleration due to gravity;

[0031] When the slump cone is cylindrical, the height h of the upper slump body is... u The calculation formula is formula (2):

[0032] h u =2τ y / (ρg) (2)

[0033] The volume V of the upper collapsed body u The calculation formula is formula (3):

[0034]

[0035] Where, r u Let r be the bottom radius of the upper collapsed body, and h(r) be the height of the collapsed body at radius r.

[0036] Preferably, the value of Δτ ranges from 0.01 to 0.1 Pa;

[0037] Preferably, the value of Δh ranges from 0.00001 to 0.0001 m;

[0038] A system for calculating the yield stress of slurry based on slump includes an input unit, a slump shape parameter judgment and input unit, a volume output unit, a yield stress initialization unit, a yield stress increase unit, an upper slump bottom height initialization unit, an upper slump bottom height increase unit, a calculation unit, a volume judgment unit, and a slump value judgment unit connected in sequence.

[0039] The input unit, wherein the input judgment is used to input the slurry density ρ and slump value h of the target collapsed body;

[0040] The slump cone shape determination unit inputs a radius r if the slump cone shape is cylindrical. n And height H; if the slump cone is frustum shaped, then input the lower base radius r of the slump cone. b slump cylinder upper bottom radius r t and slump cone height H;

[0041] A volume output unit, after determining the shape of the slump cone, outputs the volume of the slump cone according to the shape and parameters of the slump cone;

[0042] Yield stress initialization unit, wherein the yield stress unit assigns an initial yield stress value of 0;

[0043] The yield stress increasing element increases the yield stress, i.e. Where Δτ is the increment of the yield stress, This is the increased yield stress;

[0044] The bottom height initialization unit of the upper collapsed body sets the bottom height of the upper collapsed body to 0.

[0045] The unit for increasing the bottom height of the upper collapsed body increases the bottom height of the upper collapsed body, i.e. Where Δh is the increment of the bottom height of the upper collapsed body. This is to increase the bottom height of the upper collapsed body;

[0046] The calculation unit is based on the Tresca criterion and the increased yield stress. The height h of the upper collapsed body is obtained. u and the volume V of the upper collapsed body u Based on lubrication theory and the increased bottom height of the upper collapse body The volume V of the lower collapsed body is obtained. t ;

[0047] Volume determination unit, the volume determination unit determines V u +V t <V, then Jump to the bottom height increase unit of the upper collapsed body; otherwise, h c =h u +h t h c The predicted height of the target collapse body is output at the yield stress. The predicted slump value h p =Hh c ;

[0048] Slump value judgment unit, when h p When <h, then Then jump to the yield stress increase unit; otherwise, output the yield stress value at this time. The yield stress of the slurry in the target collapsed body is given.

[0049] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0050] 1. This invention uses the Tresca criterion to calculate the upper collapse body and the lubrication theory to calculate the lower collapse body, fully considering the deformation of the collapse body and the applicability of the corresponding theories, to ensure the accuracy of the yield stress prediction results;

[0051] 2. The calculation method proposed in this invention is applicable to frustums and cylindrical slump cylinders of different sizes. Different calculation formulas can be selected according to the conditions, which increases the applicability of the calculation method and further facilitates the promotion and application of yield stress calculation based on slump. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1A flowchart of the method provided by the present invention;

[0054] Figure 2 This invention provides a structural schematic diagram of the target collapse body division.

[0055] Figure 3 This is a schematic diagram of the structure of an electronic device provided by the present invention.

[0056] Among them, 1-frustum-shaped slump cone; 2-upper slump body of frustum-shaped slump cone; 3-lower slump body of frustum-shaped slump cone; 4-cylindrical slump cone; 5-upper slump body of cylindrical slump cone; 6-lower slump body of cylindrical slump cone. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0058] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or “connected,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0059] It should be noted that the terms "up", "down", "left", "right", "front", and "back" used in this invention are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0060] Due to the lack of a reliable method for calculating yield stress based on slump value in existing technologies, which poses a bottleneck for further widespread application, traditional methods for converting slump to yield stress mainly rely on the Tresca criterion. This can lead to incorrect predictions of the cross-sectional shape of the lower slump, resulting in inaccurate yield stress estimation. This invention divides the slump into upper and lower parts. The height and volume of the upper slump are calculated using the Tresca criterion, while the cross-sectional shape, height, and volume of the lower slump are calculated using lubrication theory. Then, based on the principle of volume conservation, the yield stress of the slurry is determined. Therefore, one embodiment of this invention provides a method and system for calculating the yield stress of a slurry based on slump value, specifically including:

[0061] like Figures 1 to 2 As shown, a method for calculating the yield stress of slurry based on slump includes the following steps:

[0062] S1. Obtain the slurry density ρ and slump value h;

[0063] S2. Obtain the slump cone shape parameters. If the slump cone shape is cylindrical, input the radius r. n And height H; if the slump cone is frustum shaped, then input the lower radius r of the slump cone. b slump cylinder upper bottom radius r t and slump cone height H;

[0064] S3. Divide the target collapse body into an upper collapse body and a lower collapse body, specifically including:

[0065] For a frustum slump cone, the portion of the target slump that still retains the shape of a frustum is classified as the upper slump; for a cylindrical slump cone, the portion of the target slump that still retains the shape of a cylinder is classified as the upper slump.

[0066] The deformed or flowing portion at the bottom of the target collapse body is classified as the lower collapse body.

[0067] In this embodiment, the target collapse body is divided into two parts, the upper collapse body and the lower collapse body, and calculated separately. The upper collapse body is calculated using the Tresca criterion, and the lower collapse body is calculated using the lubrication theory. The upper collapse body is the part of the collapse body whose top still maintains the shape of the collapse cylinder, and the lower collapse body is the part of the lower part of the collapse body that is significantly deformed or flows under the action of gravity.

[0068] S4. Based on the shape of the slump cone, obtain the volume V of the slump cone:

[0069] When the slump cone is a cylindrical slump cone, the radius r of the slump cone is... n The volume V of the slump cylinder is obtained by combining the height H of the slump cylinder.

[0070] When the slump cone is a frustum-shaped slump cone, the radius r of the lower base of the slump cone is... b The volume V of the slump cylinder is obtained by using the upper bottom radius rt of the slump cylinder and the height H of the slump cylinder.

[0071] In this embodiment, the slump cone is an experimental device and is an existing device used to conduct slump tests.

[0072] S5. Set the initial value τ of the yield stress. y =0;

[0073] S6. Increase the yield stress, i.e. Where Δτ is the increment of the yield stress. This is the increased yield stress;

[0074] S7. Set the bottom height h of the upper collapsed body. b =0;

[0075] S8. Increase the bottom height of the upper collapsed body, that is... Where Δh is the increment of the bottom height of the upper collapsed body. This is to increase the bottom height of the upper collapsed body;

[0076] S9, Based on the Tresca criterion and the increased yield stress The height h of the upper collapsed body is obtained. u and the volume V of the upper collapsed body u Based on lubrication theory and the increased bottom height of the upper collapse body The volume V of the lower collapsed body is obtained. t ;

[0077] When the slump cone is a frustum, the height h of the upper slump body is... u The calculation formula is formula (1):

[0078]

[0079] Where λ=Hr b / (r b -r t ), where g is the acceleration due to gravity;

[0080] When the slump cone is cylindrical, the height h of the upper slump body is... u The calculation formula is formula (2):

[0081] h u =2τ y / (ρg) (2)

[0082] The volume V of the upper collapsed body u The calculation formula is formula (3):

[0083]

[0084] Where, r u Let r be the bottom radius of the upper collapsed body, and h(r) be the height of the collapsed body at radius r.

[0085] In this embodiment, the Tresca criterion is used to calculate the height and volume of the upper collapse body.

[0086] The lubrication theory was used to calculate the cross-sectional shape of the lower collapsed body. The calculation principle is as follows: The set yield stress is calculated based on the above formula. The shape and volume V of the lower collapse body under the given conditions t The relevant calculation methods are existing technologies and will not be described in detail in this embodiment.

[0087] S10, when V u +V t <V, then Jump to step S8; otherwise, h c =h u +h t h c The predicted height of the target collapse body is output at the yield stress. The predicted slump value h p =Hh c ;

[0088] S11, when h p When <h, then Then proceed to step S6; otherwise, output the yield stress value at this point. The yield stress of the slurry in the target collapsed body is given.

[0089] In this embodiment, the values ​​of Δτ and Δh should be as small as possible to ensure calculation accuracy. Preferably, the value of Δτ ranges from 0.01 to 0.1 Pa, and the value of Δh ranges from 0.00001 to 0.0001 m.

[0090] This embodiment uses the Tresca criterion to calculate the upper slump and the lubrication theory to calculate the lower slump. It fully considers the deformation of the slump and the applicability of the corresponding theories to ensure the accuracy of the yield stress prediction results. The calculation method proposed in this embodiment is applicable to frustum and cylindrical slump cylinders of different sizes. Different calculation formulas can be selected according to the conditions, which increases the applicability of the calculation method and further facilitates the promotion and application of yield stress calculation based on slump.

[0091] Another embodiment of the present invention provides a system for calculating the yield stress of slurry based on slump, applied to the above-mentioned method for calculating the yield stress of slurry based on slump, specifically including an input unit, a slump shape parameter judgment unit, a volume output unit, a yield stress initialization unit, a yield stress increase unit, a bottom height initialization unit of the upper slump, a bottom height increase unit of the upper slump, a calculation unit, a volume judgment unit, and a slump value judgment unit connected in sequence.

[0092] The input unit, wherein the input judgment is used to input the slurry density ρ and slump value h of the target collapsed body;

[0093] The slump cone shape determination unit inputs a radius r if the slump cone shape is cylindrical. n And height H; if the slump cone is frustum shaped, then input the lower base radius r of the slump cone. b slump cylinder upper bottom radius r t and slump cone height H;

[0094] A volume output unit, after determining the shape of the slump cone, outputs the volume of the slump cone according to the shape and parameters of the slump cone;

[0095] Yield stress initialization unit, wherein the yield stress unit assigns an initial yield stress value of 0;

[0096] The yield stress increasing element increases the yield stress, i.e. Where Δτ is the increment of the yield stress, This is the increased yield stress;

[0097] The bottom height initialization unit of the upper collapsed body sets the bottom height of the upper collapsed body to 0.

[0098] The unit for increasing the bottom height of the upper collapsed body increases the bottom height of the upper collapsed body, i.e. Where Δh is the increment of the bottom height of the upper collapsed body. This is to increase the bottom height of the upper collapsed body;

[0099] The calculation unit is based on the Tresca criterion and the increased yield stress. The height h of the upper collapsed body is obtained. u and the volume V of the upper collapsed body u Based on lubrication theory and the increased bottom height h of the upper collapsed body * b The volume V of the lower collapsed body is obtained. t ;

[0100] Volume determination unit, the volume determination unit determines V u +V t <V, then Jump to the bottom height increase unit of the upper collapsed body; otherwise, h c =h u +h t h c The predicted height of the target collapse body is output at the yield stress. The predicted slump value h p =Hh c ;

[0101] Slump value judgment unit, when h p When <h, then Then jump to the yield stress increase unit; otherwise, output the yield stress value at this time. The yield stress of the slurry in the target collapsed body is given.

[0102] The specific principle of this embodiment is as follows: The slurry density ρ of the target slump is determined; the shape of the slump cylinder of the experimental equipment (including frustum and cylinder shapes) is determined; its volume is determined based on the shape of the experimental equipment; the slump experiment is started to obtain the slump value h of the slurry of the target slump; an initial value of the yield stress is assumed, and the yield stress is increased to determine the height of the bottom of the upper slump; the height of the bottom of the upper slump is increased; the Tresca criterion is used to calculate the height and volume of the upper slump; the lubrication theory is used to calculate the cross-sectional shape of the lower slump and to deduce the shape of the lower slump under the corresponding yield stress; the volume of the lower slump is calculated. Based on the judgment of relevant relationships, a corresponding iterative operation is performed to finally obtain the yield stress of the target slump.

[0103] Based on the above method and system, in specific applications, the frustum-shaped slump cone has an upper radius of 0.025m, a lower radius of 0.05m, and a height of 0.15m. The density of the fly ash slurry is 2000 kg·m³. -3 The slump measured in the slump test was 0.09 m, and the calculated yield stress was 268.8 Pa.

[0104] This embodiment uses the Tresca criterion to calculate the upper slump and the lubrication theory to calculate the lower slump. It fully considers the deformation of the slump and the applicability of the corresponding theories to ensure the accuracy of the yield stress prediction results. The calculation method proposed in this embodiment is applicable to frustum and cylindrical slump cylinders of different sizes. Different calculation formulas can be selected according to the conditions, which increases the applicability of the calculation method and further facilitates the promotion and application of yield stress calculation based on slump.

[0105] Figure 3 This is a schematic diagram of the structure of an electronic device 600 provided in an embodiment of the present invention. The electronic device 600 may vary considerably due to different configurations or performance. It may include one or more central processing units (CPUs) 610 and one or more memories 620. The memory 620 stores at least one instruction, which is loaded and executed by the processor 610 to implement the steps of the above-described method for calculating the yield stress of slurry based on slump.

[0106] In an exemplary embodiment, a computer-readable storage medium is also provided, such as a memory including instructions that can be executed by a processor in a terminal to perform the method for calculating the yield stress of slurry based on slump. For example, the computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0107] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of the technical solutions of the present invention.

Claims

1. A method for calculating the yield stress of slurry based on slump, characterized in that, Includes the following steps: S1. Obtain slurry density ρ slump value ; S2. Obtain the slump cone shape parameters: When the slump cylinder is cylindrical, obtain the radius. and height ; When the slump cone is frustum-shaped, obtain the radius of the lower base of the slump cone. Slump cone top radius and slump cone height ; S3. Divide the target collapse body into upper collapse body and lower collapse body; S4. Based on the shape of the slump cone, obtain the volume of the slump cone. ; S5. Set the initial value of the yield stress. ; S6. Increase the yield stress, i.e. ,in, For the increment of yield stress, This is the increased yield stress; S7. Set the bottom height of the upper collapsed body. ; S8. Increase the bottom height of the upper collapsed body, that is... ,in, This is the increment of the bottom height of the upper collapsed body. This is to increase the bottom height of the upper collapsed body; S9, Based on the Tresca criterion and the increased yield stress The height of the upper collapsed body was obtained. and the volume of the upper collapsed body Based on lubrication theory and the increased bottom height of the upper collapse body The volume of the lower collapsed body was obtained. ,include: When the slump cone is a frustum, the height of the upper slump body is... The calculation formula is formula (1): （1） in , It is the acceleration due to gravity; When the slump cone is cylindrical, the height of the upper slump body is... The calculation formula is formula (2): （2） The volume of the upper collapsed body The calculation formula is formula (3): （3） in, The radius of the bottom of the upper collapsed body is given. radius The height of the collapsed body; S10, when ,but Proceed to step S8; otherwise, , The predicted height of the target collapse body is output at the yield stress. Slump value ; S11, when At that time, Proceed to step S6; Otherwise, output the yield stress value at this time. , The yield stress of the slurry in the target collapsed body is given.

2. The method for calculating the yield stress of slurry based on slump according to claim 1, characterized in that, The step S3 divides the target collapse body into an upper collapse body and a lower collapse body, including: When the slump cylinder is cylindrical, the portion of the top of the target collapse body that still retains the shape of a frustum is classified as the upper collapse body. When the slump cylinder is truncated cone-shaped, the portion of the top of the target collapse body that still retains a cylindrical shape is classified as the upper collapse body. The deformed or flowing portion at the bottom of the target collapse body is classified as the lower collapse body.

3. The method for calculating the yield stress of slurry based on slump according to claim 2, characterized in that, S4 determines the volume of the slump cone based on its shape. include: When the slump cone is a cylindrical slump cone, the radius of the slump cone... and the height of the slump cylinder The volume of the slump cylinder is obtained. ; When the slump cone is a frustum-shaped slump cone, the radius of the lower base of the slump cone is... The upper bottom radius of the slump cylinder and the height of the slump cylinder The volume of the slump cylinder is obtained. V .

4. The method for calculating the yield stress of slurry based on slump according to claim 1, characterized in that, The The value range is 0.01~0.1 Pa.

5. The method for calculating the yield stress of slurry based on slump according to claim 1, characterized in that, The The value range is 0.00001~0.0001 m.

6. A system for calculating the yield stress of slurry based on slump, used to implement the method for calculating the yield stress of slurry based on slump as described in any one of claims 1 to 5, characterized in that, It includes an input unit, a collapse body shape parameter judgment unit, a volume output unit, a yield stress initialization unit, a yield stress increase unit, an upper collapse body bottom height initialization unit, an upper collapse body bottom height increase unit, a calculation unit, a volume judgment unit, and a slump value judgment unit connected in sequence. Input unit, the input unit is used to input the slurry density of the target collapsed body. slump value ; The slump cone shape determination unit, if the slump cone shape is cylindrical, then inputs the radius. and height ; If the slump cone is frustum shaped, then input the radius of the lower base of the slump cone. Slump cone top radius and slump cone height ; A volume output unit, after determining the shape of the slump cone, outputs the volume of the slump cone according to the shape and parameters of the slump cone; A yield stress initialization unit, wherein the yield stress initialization unit assigns an initial yield stress value of 0; The yield stress increasing element increases the yield stress, i.e. ,in, For the increment of yield stress, This is the increased yield stress; The bottom height initialization unit of the upper collapsed body sets the bottom height of the upper collapsed body to 0. The unit for increasing the bottom height of the upper collapsed body increases the bottom height of the upper collapsed body, i.e. ,in, This is the increment of the bottom height of the upper collapsed body. This is to increase the bottom height of the upper collapsed body; The calculation unit is based on the Tresca criterion and the increased yield stress. The height of the upper collapsed body was obtained. and the volume of the upper collapsed body Based on lubrication theory and the increased bottom height of the upper collapse body The volume of the lower collapsed body was obtained. ; Volume determination unit, the volume determination unit determines ,but Jump to the bottom height increase unit of the upper collapsed body; otherwise, , The predicted height of the target collapse body is output at the yield stress. Slump prediction value ; Slump value judgment unit, when At that time, If the condition is met, the program jumps to the yield stress increase unit; otherwise, it outputs the predicted yield stress value at this point. , The yield stress of the slurry in the target collapsed body is given.

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