A system for testing the stability of high fluidity concrete

Abstract

The application provides a system suitable for stability test of high-fluidity concrete, and relates to the technical field of concrete stability test.The system comprises a concrete container and a resistance test device;an inner middle position of the concrete container is provided with a partition;several uniformly distributed steel bars are arranged between the bottom of the partition and the bottom of the concrete container;several groups of electrode pairs are symmetrically arranged on both sides of the inner partition of the concrete container;the interval between the adjacent two groups of electrode pairs on the same side is the same;one side of the partition is the entrance of the concrete to be tested, and the other side is the exit of the concrete to be tested;the concrete to be tested is poured through the entrance, flows through the steel bars and reaches the exit;the application can quickly, conveniently and accurately determine the stability of high-fluidity concrete, especially the stability in the flowing state and when passing through the steel bars, and is convenient to operate, high in test precision and wide in application range.

Description

Technical Field

[0001] This invention relates to the field of concrete stability testing technology, and in particular to a stability testing system suitable for highly fluid concrete. Background Technology

[0002] Good workability of fresh concrete is a prerequisite for ensuring the construction efficiency and quality of concrete structures. The workability of fresh concrete typically includes three aspects: fluidity, cohesiveness, and water retention. High-flowability concrete must maintain both high fluidity and cohesiveness, ensuring the uniformity and stability of all raw material components. Otherwise, segregation and bleeding are prone to occur, and the vibration compaction process can easily exacerbate the degree of segregation and bleeding, ultimately leading to a significant reduction in the mechanical properties and durability of the concrete structure.

[0003] Existing methods for testing the stability of fresh concrete mainly rely on quantifying the degree of coarse aggregate aggregation or separation from mortar in the mixture. Common testing methods include slump and slump flow VSI tests, cylinder segregation tests, and sieve stability tests. However, some of these methods cannot provide quantitative evaluation, such as the VSI slump flow test, and the evaluation results are not objective enough. Other methods, such as the cylinder segregation test and sieve stability test, have cumbersome testing procedures and are inconvenient to perform on-site. Summary of the Invention

[0004] This invention provides a stability testing system suitable for highly fluid concrete, to solve the technical problems of inability to quantitatively evaluate and inconvenient operation in existing methods for testing the stability of freshly mixed concrete.

[0005] According to the present application, this invention provides a stability testing device for highly fluid concrete. The system includes a concrete container and a resistance testing device. A partition is disposed in the middle of the interior of the concrete container. A plurality of uniformly distributed reinforcing bars are disposed between the bottom of the partition and the bottom of the concrete container. A plurality of electrode pairs are mirror-arranged on both sides of the partition inside the concrete container, with the same spacing between adjacent electrode pairs on the same side. One side of the partition is the inlet for the concrete to be tested, and the other side is the outlet for the concrete to be tested. The concrete to be tested is poured in through the inlet, flows through the reinforcing bars, and reaches the outlet.

[0006] Each electrode pair is connected to the resistance testing device via a wire; the resistance testing device is used to perform the following steps:

[0007] S100, if the height of the concrete liquid level to be measured on the inlet side of the concrete container is the same as the height of the concrete liquid level to be measured on the outlet side, obtain the resistance value measured by each pair of electrodes on the inlet side at each preset time point, so as to obtain a list set of inlet side resistance values ​​A = (A1, A2, ..., A...). i A n ), i=1, 2,...,n; where, A i A is a list of the measured resistance values ​​for each pair of electrodes on the inlet side at the i-th time point. i =(A i，1 A i，2 A i，j A i，m ), j = 1, 2, ..., m; A i，j Let A be the resistance value measured by the j-th electrode pair on the inlet side at the i-th time point, and m be the number of electrode pairs on the inlet or outlet side; i，r The height is less than A i，r+1 The height; r = 1, 2, ..., n-1;

[0008] S200, acquire the resistance values ​​measured for each pair of electrodes on the outlet side at each preset time point, to obtain a list set of outlet side resistance values ​​B = (B1, B2, ..., B...). i B n ); where B i B is a list of the measured resistance values ​​for each pair of electrodes on the outlet side at the i-th time point. i = (B i，1 B i，2 B i，j B i，m );B i，j B represents the resistance value measured by the j-th electrode pair on the outlet side at the i-th time point; i，r The height is less than B i，r+1 Height;

[0009] S300, based on A and B, determine the stability rate of the concrete to be tested at each preset time point to obtain a list of stability rates of the concrete to be tested, S = (S1, S2, ..., S...). i S n ); where S i S represents the stability rate of the concrete to be tested at the i-th preset time point; i =(1-(ΔR) i，b -ΔR i，t ) / ΔR i ); where ΔR i，b The difference in resistance at the bottom, ΔR i，t The difference in resistance at the top, ΔR i，t The difference in average resistance values; ΔR i，b =|Ai，1 -B i，1 |;ΔR i，t =|A i，m -B i，m |;ΔR i = (1 / m)×∑ m j＝1 |A i，j -B i，j |;

[0010] S400, based on S, determine the stability time curve QT corresponding to the concrete to be tested, so as to analyze and judge the settlement of coarse aggregate in the concrete after passing through the steel reinforcement through QT.

[0011] Furthermore, prior to step S100, target substance solutions of different preset concentrations are sequentially injected into the concrete container;

[0012] The resistance testing device is also used to perform the following steps:

[0013] S010, Obtain the resistance value measured for each electrode pair at each height;

[0014] S020, the resistance values ​​measured for each electrode pair at each height are fitted to obtain a list of height resistance curves for the target substance solution, C = (C1, C2, ..., C...). p C 2m ), p = 1, 2, ..., 2m; where, C p The target substance solution resistance curve for the p-th electrode pair;

[0015] S030, obtain the similarity between the height resistance curve of the target substance solution corresponding to each group of electrodes in C and the height resistance curve of the corresponding standard target substance solution, so as to obtain a similarity list γ=(γ1, γ2, …, γ p , ..., γ 2m ); where γ p C p Similarity to the high resistance curve of the corresponding standard target substance solution;

[0016] S040, iterate through γ, if γ p If <γ', then the p-th electrode pair is calibrated; where γ' is a preset curve similarity threshold.

[0017] Furthermore, the target substance solution includes: sodium chloride solution.

[0018] Furthermore, the resistance testing device includes several switches, and each pair of electrodes is connected to the resistance testing device through a switch.

[0019] Furthermore, the concrete container is a U-shaped channel; the material of the concrete container is an insulating material.

[0020] Furthermore, the distance between two adjacent reinforcing bars is the same.

[0021] Furthermore, a through hole is provided on the side wall of the concrete container at the same position as the center of the electrode pair, and the through hole is used to pass through the wire.

[0022] The present invention has at least the following beneficial effects:

[0023] This invention relates to a stability testing system for highly fluid concrete, which can quickly, conveniently, and accurately determine the stability of highly fluid concrete, especially its stability under flowing conditions and when passing through reinforcing bars. It is useful for determining whether the concrete density of a certain part of a highly fluid concrete structure meets design requirements and whether it can satisfy the safety needs of high fluidity. During on-site testing, different reinforcing bar diameters or spacings can be set according to actual construction organization requirements. The resistance sampling frequency, single sampling time, and total testing time can all be adjusted according to actual needs. This testing system has a simple working principle, is easy to operate, has high testing accuracy, and a wide range of applications. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of a stability testing system for highly fluid concrete provided in an embodiment of the present invention;

[0026] Figure 2 A flowchart illustrating the steps performed by the resistance testing device for a high-flowability concrete stability testing system provided in this embodiment of the invention;

[0027] Symbol explanation: 100, concrete container; 110, partition; 120, electrode pair; 130, reinforcing bar; 140, wire; 200, resistance testing device; 210, switch; 220, switch controller; 230, USB-485 converter; 240, USB interface; 250, resistance testing module; 260, power supply. Detailed Implementation

[0028] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that, based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Furthermore, this device and / or practice the method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0030] The following section introduces a stability testing system suitable for highly fluid concrete, such as... Figure 1 As shown, the stability testing system for highly fluid concrete includes a concrete container 100 and a resistance testing device 200. A partition 110 is located in the middle of the interior of the concrete container 100. Several uniformly distributed reinforcing bars 130 are arranged between the bottom of the partition 110 and the bottom of the concrete container 100. Several sets of electrode pairs 120 are mirror-arranged on both sides of the partition 110 inside the concrete container 100, with the same spacing between adjacent sets of electrode pairs on the same side. One side of the partition 110 is the inlet for the concrete to be tested, and the other side is the outlet. The concrete to be tested is poured in through the inlet, flows through the reinforcing bars 130, and reaches the outlet.

[0031] In this embodiment, the concrete container 100 is a U-shaped channel with insulating material on its sidewalls and a partition 110 inside. The upper end of the partition 110 is flush with the U-shaped channel container, and the lower end is provided with reinforcing bars 130. The reinforcing bars are arranged vertically downwards at equal intervals, and the lower ends of the reinforcing bars 130 are welded to the bottom of the U-shaped channel container. Multiple circular electrode pairs 120 are respectively provided at the left and right ends of the U-shaped channel container. The electrode pairs 120 are at different heights but equally spaced. The two electrodes of the same electrode pair 120 are respectively arranged on the inner wall of the U-shaped channel container in the same position.

[0032] The electrode pair 120 has a through hole at the same position as the inner wall of the U-shaped groove, through which the wire 140 can pass and is fixed to the container by a conductive screw. Each electrode pair 120 is used to measure the resistance value of the concrete at that height. The wire passes through the side wall of the U-shaped groove, and after passing through the wire, it is connected to the resistance testing device 200.

[0033] The main functional components of the resistance testing device 200 include switches 210, switch controller 220, resistance testing module 250, power supply 260, USB-485 converter 230, and USB interface 240. The number of switches 210 is the same as the number of electrode pairs 120, and there is a one-to-one correspondence between switches 210 and electrode pairs 120.

[0034] The switch controller 220 controls the closing of the switch 210, ensuring that only one electrode pair 120 is connected at any given time. The resistance testing module 250 is used to test the resistance value, and after sampling, it communicates with the computer via a USB-485 converter 230. The computer can programmatically control parameters such as the testing time and sampling frequency of the resistance testing module 250, and control the switch controller 220 to determine the testing location for the concrete resistance value. The power supply 260 of the resistance testing device 200 is 220V AC.

[0035] Each electrode pair 120 is connected to the resistance testing device 200 via a wire 140; the resistance testing device 200 is used to perform the following steps:

[0036] S100, if the height of the concrete liquid level to be measured on the inlet side of the concrete container is the same as the height of the concrete liquid level to be measured on the outlet side, obtain the resistance value measured by each pair of electrodes on the inlet side at each preset time point, so as to obtain a list set of inlet side resistance values ​​A = (A1, A2, ..., A...). i A n ), i=1, 2,...,n; where, A i A is a list of the measured resistance values ​​for each pair of electrodes on the inlet side at the i-th time point. i =(A i，1 A i，2 A i，j A i，m ), j = 1, 2, ..., m; A i，j Let A be the resistance value measured by the j-th electrode pair on the inlet side at the i-th time point, and m be the number of electrode pairs on the inlet or outlet side; i，r The height is less than A i，r+1 The height; r = 1, 2, ..., n-1.

[0037] In this embodiment, the time interval between two adjacent preset time points is a preset duration, for example, the preset duration is 5 minutes, that is, a test is performed every 5 minutes; during each test, the resistance value of the concrete to be tested measured by each set of electrodes on the inlet side can be obtained, and thus A is obtained.

[0038] S200, acquire the resistance values ​​measured for each pair of electrodes on the outlet side at each preset time point, to obtain a list set of outlet side resistance values ​​B = (B1, B2, ..., B...). iB n ); where B i B is a list of the measured resistance values ​​for each pair of electrodes on the outlet side at the i-th time point. i = (B i，1 B i，2 B i，j B i，m );B i，j B represents the resistance value measured by the j-th electrode pair on the outlet side at the i-th time point; i，r The height is less than B i，r+1 The height.

[0039] In this embodiment, when testing each pair of electrodes on the inlet side, the resistance value of the concrete to be tested measured by each pair of electrodes on the outlet side can be obtained simultaneously, thereby obtaining B.

[0040] S300, based on A and B, determine the stability rate of the concrete to be tested at each preset time point to obtain a list of stability rates of the concrete to be tested, S = (S1, S2, ..., S...). i S n ); where S i S represents the stability rate of the concrete to be tested at the i-th preset time point; i =(1-(ΔR) i，b -ΔR i，t ) / ΔR i ); where ΔR i，b The difference in resistance at the bottom, ΔR i，t The difference in resistance at the top, ΔR i，t The difference in average resistance values; ΔR i，b =|A i，1 -B i，1 |;ΔR i，t =|A i，m -B i，m |;ΔR i = (1 / m)×∑ m j＝1 |A i，j -B i，j |

[0041] In this embodiment, the stability rate S i Between 0 and 1. S i The closer ΔR is to 1, the better. i，b With ΔR i，t The closer the values ​​are, the more similar the volume fractions of coarse aggregate in the bottom and top concrete sections are at the i-th preset time point, indicating higher stability of the concrete under test; the closer the stability rate is to 0, the higher the stability of ΔR. i，b With ΔR i，tThe larger the difference, the greater the difference in the volume fraction of coarse aggregate in the bottom and top concrete at the i-th preset time, and the lower the stability of the concrete under test.

[0042] S400, based on S, determine the stability time curve QT corresponding to the concrete to be tested, so as to analyze and judge the settlement of coarse aggregate in the concrete after passing through the steel reinforcement through QT.

[0043] After obtaining the above S, each stability rate in S corresponds to a time. Therefore, it is possible to fit all the stability rates in S to obtain the stability rate-time curve QT corresponding to the concrete to be tested. Then, QT can be analyzed to determine the settlement of coarse aggregate in the concrete to be tested after passing through the steel reinforcement. It should be noted that those skilled in the art can use existing stability rate analysis methods to analyze and determine the settlement of coarse aggregate in the concrete to be tested after passing through the steel reinforcement according to actual needs. This will not be elaborated here.

[0044] Furthermore, prior to step S100, target substance solutions of different preset concentrations are sequentially injected into the concrete container; wherein, the target substance solution may be a sodium chloride solution, and the preset concentration may be 0.8 g / L.

[0045] The resistance testing device is also used to perform the following steps:

[0046] S010, obtain the resistance value measured for each electrode pair at each height.

[0047] S020, the resistance values ​​measured for each electrode pair at each height are fitted to obtain a list of height resistance curves for the target substance solution, C = (C1, C2, ..., C...). p C 2m ), p = 1, 2, ..., 2m; where, C p This is the high resistance curve of the target substance solution corresponding to the p-th group of electrodes.

[0048] S030, obtain the similarity between the height resistance curve of the target substance solution corresponding to each group of electrodes in C and the height resistance curve of the corresponding standard target substance solution, so as to obtain a similarity list γ=(γ1, γ2, …, γ p , ..., γ 2m ); where γ p C p Similarity to the high resistance curve of the corresponding standard target substance solution.

[0049] In this embodiment, calibrated electrode pairs can be used to test the resistance values ​​of target substance solutions at different heights in the concrete container under test, so as to obtain a standard target substance solution height resistance curve. It should be noted that those skilled in the art can use existing curve similarity determination methods according to actual needs to obtain the similarity between the target substance solution height resistance curve corresponding to each set of electrode pairs in C and the corresponding standard target substance solution height resistance curve, which will not be elaborated here.

[0050] S040, iterate through γ, if γ p If <γ', then the p-th electrode pair is calibrated; where γ' is a preset curve similarity threshold.

[0051] In this embodiment, the above steps can be used to calibrate each electrode pair to avoid inaccurate stability rate of the concrete under test due to inaccurate electrode pair measurements; γ' can be an empirical value.

[0052] To further verify the accuracy of the method in this embodiment, the following example is provided for illustration:

[0053] The concrete to be tested in the container is divided into upper, middle, and lower sections. After the concrete has initially set, the three sections are separated and placed on a 4.75mm sieve (aggregates larger than 4.75mm are called coarse aggregate). The sections are then rinsed with water until the coarse aggregate slurry is completely washed away. The coarse aggregate on the sieve is then dried, and the mass of each section (upper, middle, and lower) is weighed. The stability of the concrete is evaluated based on the mass of the coarse aggregate. If this method is used, the stability of the concrete can be represented by S², and the calculation formula is as follows:

[0054]

[0055] Where, m b This indicates the mass of coarse aggregate in the lower concrete sample (in grams); m t This indicates the mass of coarse aggregate in the upper concrete to be tested (in grams); This represents the average mass of coarse aggregate in all the concrete samples tested (in grams).

[0056] Coarse aggregates are typically divided into three ranges based on particle size: 4.75–9.5 mm, 9.5–16 mm, and 16–19 mm. The particle size distribution of coarse aggregates in different parts of the same test group was statistically analyzed. Then, the correlation between the two testing methods was analyzed. The results showed that the two methods had a strong linear correlation, demonstrating the feasibility and reliability of using the method in this embodiment to evaluate the stability of highly fluid concrete.

[0057] This embodiment of the stability testing system for highly fluid concrete enables rapid, convenient, and accurate determination of the stability of highly fluid concrete, especially its stability during flow and when passing through reinforcing bars. It is useful for determining whether the concrete density of a specific part of a highly fluid concrete structure meets design requirements and satisfies the safety needs of high fluidity. During on-site testing, different reinforcing bar diameters or spacings can be set according to actual construction requirements. The resistance sampling frequency, single sampling time, and total testing time can all be adjusted as needed. This testing system has a simple working principle, is easy to operate, has high testing accuracy, and a wide range of applications.

[0058] Furthermore, although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps.

[0059] Embodiments of the present invention also provide a non-transitory computer-readable storage medium that can be disposed in an electronic device to store at least one instruction or at least one program related to implementing a method in the method embodiments, wherein the at least one instruction or the at least one program is loaded and executed by the processor to implement the method provided in the above embodiments.

[0060] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0061] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0062] The program code contained on the readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0063] Program code for performing the operations of this application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0064] Embodiments of the present invention also provide an electronic device, including a processor and the aforementioned non-transitory computer-readable storage medium.

[0065] The electronic device is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments in this application.

[0066] Electronic devices are manifested in the form of general-purpose computing devices. Components of an electronic device may include, but are not limited to: at least one processor, at least one memory, and a bus connecting different system components (including memory and processor).

[0067] The memory stores program code that can be executed by the processor, causing the processor to perform the steps in the various embodiments described in this specification.

[0068] The memory may include readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory, and may further include read-only memory (ROM).

[0069] The memory may also include programs / utilities having a set (at least one) of program modules, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0070] A bus can represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus that uses any of the various bus structures.

[0071] The electronic device can also communicate with one or more external devices (e.g., keyboards, pointing devices, Bluetooth devices, etc.), one or more devices that enable a user to interact with the electronic device, and / or any device that enables the electronic device to communicate with one or more other computing devices (e.g., routers, modems, etc.). This communication can be performed via input / output (I / O) interfaces. Furthermore, the electronic device can communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter. The network adapter communicates with other modules of the electronic device via a bus. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with the electronic device, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0072] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0073] Embodiments of the present invention also provide a computer program product including program code, which, when the program product is run on an electronic device, causes the electronic device to perform the steps of the methods described above in various exemplary embodiments of the present invention.

[0074] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should also understand that various modifications can be made to the embodiments without departing from the scope and spirit of the invention.

Claims

1. A stability testing system suitable for highly fluid concrete, characterized in that, The system includes a concrete container and a resistance testing device. A partition is located in the middle of the interior of the concrete container. Several uniformly distributed reinforcing bars are arranged between the bottom of the partition and the bottom of the concrete container. Several sets of electrode pairs are mirror-arranged on both sides of the partition inside the concrete container, with adjacent sets of electrode pairs on the same side having the same spacing. One side of the partition is the inlet for the concrete to be tested, and the other side is the outlet. The concrete to be tested is poured in through the inlet, flows through the reinforcing bars, and reaches the outlet. Each set of electrode pairs is connected to the resistance testing device via a wire. The resistance testing device is used to perform the following steps: S100, if the height of the concrete liquid level to be measured on the inlet side of the concrete container is the same as the height of the concrete liquid level to be measured on the outlet side, obtain the resistance value measured by each pair of electrodes on the inlet side at each preset time point, so as to obtain a list set of inlet side resistance values ​​A = (A1, A2, ..., A...). i A n ), i=1, 2,...,n; among them, A i A is a list of the measured resistance values ​​for each pair of electrodes on the inlet side at the i-th time point. i = (A i，1 A i，2 A i，j A i，m ), j=1,2,…,m; A i，j Let A be the resistance value measured by the j-th electrode pair on the inlet side at the i-th time point, and m be the number of electrode pairs on the inlet or outlet side; i，r The height is less than A i，r+1 The height; r = 1, 2, ..., m-1; S200, acquire the resistance values ​​measured for each pair of electrodes on the outlet side at each preset time point, to obtain a list set of outlet side resistance values ​​B = (B1, B2, ..., B...). i B n ); where B i B is a list of the measured resistance values ​​for each pair of electrodes on the outlet side at the i-th time point. i = (B i，1 B i，2 B i，j B i，m ); B i，j B represents the resistance value measured by the j-th electrode pair on the outlet side at the i-th time point; i，r The height is less than B i，r+1 Height; S300, based on A and B, determine the stability rate of the concrete to be tested at each preset time point to obtain the stability rate list of the concrete to be tested S = (S1, S2, ..., S...). i S n ); where S i S represents the stability rate of the concrete to be tested at the i-th preset time point; i =(1-(ΔR i，b -ΔR i，t ) / ΔR i ); where ΔR i，b The difference in resistance at the bottom, ΔR i，t The difference in resistance at the top, ΔR i The difference in average resistance values; ΔR i，b =|A i，1 -B i，1 |;ΔR i，t =|A i，m -B i，m |;ΔR i =(1 / m)×∑ m j=1 |A i，j -B i，j |; S400, based on S, determine the stability time curve QT corresponding to the concrete to be tested, so as to analyze and judge the settlement of coarse aggregate in the concrete after passing through the steel reinforcement through QT.

2. The stability testing system for highly fluid concrete according to claim 1, characterized in that, Before step S100, target substance solutions of different preset concentrations are sequentially injected into the concrete container; The resistance testing device is also used to perform the following steps: S010, Obtain the resistance value measured for each electrode pair at each height; S020, the resistance values ​​measured for each electrode pair at each height are fitted to obtain a list of height resistance curves for the target substance solution, C = (C1, C2, ..., C...). p C 2m ), p=1,2,…,2m; where, C p The target substance solution resistance curve for the p-th electrode pair; S030, obtain the similarity between the height resistance curve of the target substance solution corresponding to each group of electrodes in C and the height resistance curve of the corresponding standard target substance solution, so as to obtain a similarity list γ=(γ1, γ2, ..., γ...). p , ..., γ 2m ); where γ p C p Similarity to the high resistance curve of the corresponding standard target substance solution; S040, iterate through γ, if γ p If <γ', then the p-th electrode pair is calibrated; where γ' is a preset curve similarity threshold.

3. The stability testing system for highly fluid concrete according to claim 2, characterized in that, The target substance solution includes: sodium chloride solution.

4. The stability testing system for highly fluid concrete according to claim 1, characterized in that, The resistance testing device includes several switches, and each pair of electrodes is connected to the resistance testing device through a switch.

5. The stability testing system for highly fluid concrete according to claim 1, characterized in that, The concrete container is a U-shaped channel; the material of the concrete container is an insulating material.

6. The stability testing system for highly fluid concrete according to claim 1, characterized in that, The distance between two adjacent reinforcing bars is the same.

7. The stability testing system for highly fluid concrete according to claim 1, characterized in that, A through hole is provided on the side wall of the concrete container at the same position as the center of the electrode pair, and the through hole is used to pass through the wire.

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