Stability testing system suitable for high-fluidity concrete

Abstract

The invention provides a stability testing system suitable for high-fluidity concrete, and relates to the technical field of concrete stability testing, the system comprises a concrete container and a resistance testing device; wherein a partition plate is arranged in the middle of the interior of the concrete container; a plurality of uniformly distributed steel bars are arranged between the bottom of the partition plate and the bottom of the concrete container; a plurality of groups of electrode pairs are arranged on the two sides of the partition plate in the concrete container in a mirroring manner, and the intervals between every two adjacent groups of electrode pairs on the same side are the same; one side of the partition plate is an inlet of to-be-detected concrete, the other side of the partition plate is an outlet of the to-be-detected concrete, and the to-be-detected concrete is poured in through the inlet and reaches the outlet through the reinforcing steel bar; the method can quickly, conveniently and accurately measure the stability of the high-fluidity concrete, especially the stability of the high-fluidity concrete passing through the reinforcing steel bar in the flowing state, and is convenient to operate, high in test precision and wide in application range.

Description

Technical Field

[0001] The invention relates to the technical field of concrete stability testing, and in particular to a stability testing system suitable for high-fluidity concrete. Background Art

[0002] Good workability of fresh concrete is a prerequisite for ensuring the construction efficiency and quality of concrete structure projects. The workability of fresh concrete usually includes three aspects: fluidity, cohesion and water retention. High-fluidity concrete must have both cohesion and water retention while maintaining high fluidity, and keep the components of the raw materials uniform and stable. Otherwise, segregation and bleeding will easily occur, and the vibration construction process will easily aggravate the degree of segregation and bleeding, which will ultimately lead to a significant reduction in the mechanical properties and durability of the concrete structure.

[0003] The existing test methods for the stability of fresh concrete are mainly achieved by quantifying the degree of aggregation of coarse aggregate in the mixture or the degree of separation from the mortar; common test methods include slump and slump expansion VSI test, cylinder segregation test and sieve stability test, etc. Among these fresh concrete stability test methods, some methods cannot be quantitatively evaluated, such as slump expansion VSI test; and the evaluation results are not objective enough; some methods have cumbersome test steps, such as cylinder segregation test and sieve stability test; and are inconvenient to operate when testing on the construction site. Summary of the invention

[0004] The invention provides a stability testing system for high-fluidity concrete, so as to solve the technical problems of being unable to make quantitative evaluation and being inconvenient to operate in the testing method for the stability of fresh concrete in the prior art.

[0005] According to the present application, the present invention provides a stability test device for high-fluidity concrete, the system comprising: a concrete container and a resistance test device; wherein a partition is provided at the middle position inside the concrete container; a plurality of evenly distributed steel bars are provided between the bottom of the partition and the bottom of the concrete container; a plurality of groups of electrode pairs are mirror-imaged on both sides of the partition inside the concrete container, and the intervals between two adjacent groups of electrode pairs on the same side are the same; one side of the partition is an inlet for the concrete to be tested, and the other side is an outlet for the concrete to be tested, the concrete to be tested is poured in through the inlet, flows through the steel bars to reach the outlet;

[0006] Each set of electrode pairs is connected to the resistance testing device through 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 at the inlet side of the concrete container is the same as the height of the concrete liquid level to be measured at the outlet side, obtain the resistance value measured by each electrode pair at the inlet side at each preset time point to obtain an inlet side resistance value list set A=(A1, A2, ..., A i , …, A n ), i=1, 2,...,n; where, A i is a list of resistance values ​​measured for each electrode pair on the inlet side at the i-th time point, A i =(A i，1 , A i，2 , …, A i，j , …, A i，m ), j = 1, 2, ..., m; A i，j is the resistance value measured by the jth electrode pair on the inlet side at the i-th time point, m is the number of electrode pairs on the inlet side or outlet side; A i，r The height is less than A i，r+1 The height of; r = 1, 2, ..., n-1;

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

[0009] S300, according to A and B, determine the stability rate of the concrete to be tested at each preset time point to obtain a stability rate list S of the concrete to be tested = (S1, S2, ..., S i , …, S n ), where S i is the stability rate of the concrete to be tested at the i-th preset time point; S i =(1-(ΔR i，b -ΔR i，t ) / ΔR i ), where ΔR i，b is the bottom resistance difference, ΔR i，t is the top resistance difference, ΔR i，t Is the average resistance difference; 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, determining a stability rate time curve QT corresponding to the concrete to be tested according to S, so as to analyze and judge the settlement of the coarse aggregate in the concrete to be tested after passing through the steel bars through QT.

[0011] Furthermore, before step S100, target substance solutions with 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, obtaining the resistance value measured by each electrode pair at each height;

[0014] S020, fitting the resistance values ​​measured by each electrode pair at each height to obtain a target substance solution height resistance curve list C = (C1, C2, ..., C p , …, C 2m ), p = 1, 2, ..., 2m; where C p is the target substance solution height resistance curve corresponding to the p-th group of electrode pairs;

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

[0016] S040, traverse γ, if γ p <γ', the p-th group of electrode pairs is calibrated; wherein γ' is a preset curve similarity threshold.

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

[0018] Furthermore, the resistance testing device includes a plurality of switches, and each group of electrode pairs is connected to the resistance testing device via a switch.

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

[0020] Furthermore, the distances between two adjacent steel bars are the same.

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

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

[0023] The stability testing system for high-fluidity concrete of the present invention can quickly, conveniently and accurately measure the stability of high-fluidity concrete, especially the stability when the concrete is in a flowing state and passes through steel bars, and is useful for judging whether the density of concrete at a certain part of a high-fluidity concrete structure meets the design requirements and whether the safety needs of high fluidity can be met; during the on-site test process, different steel bar diameters or steel bar spacings can be set according to actual construction organization requirements; the sampling frequency of the resistance, the single sampling time and the total test time can all be adjusted according to actual needs; the testing system has a simple working principle, convenient operation, high testing accuracy and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of a stability testing system for high-fluidity concrete provided by an embodiment of the present invention;

[0026] Figure 2 A flow chart of the steps performed by a resistance testing device for a high-fluidity concrete stability testing system provided by an embodiment of the present invention;

[0027] Explanation of symbols: 100, concrete container; 110, partition; 120, electrode pair; 130, steel bar; 140, conductor; 200, resistance testing device; 210, switch; 220, switch controller; 230, USB-485 converter; 240, USB interface; 250, resistance testing module; 260, power supply. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] It should be noted that, based on the present disclosure, those skilled in the art should understand that an 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 described herein can be used to implement a device and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0030] The following is an introduction to a stability test system for high-fluidity concrete. Figure 1 As shown, the stability test system for high-fluidity concrete includes: a concrete container 100 and a resistance test device 200; wherein a partition 110 is arranged in the middle position inside the concrete container 100; a plurality of uniformly distributed steel bars 130 are arranged between the bottom of the partition 110 and the bottom of the concrete container 100; a plurality of groups of electrode pairs 120 are arranged in mirror image on both sides of the partition 110 inside the concrete container 100, and the intervals between two adjacent groups of electrode pairs on the same side are the same; one side of the partition 110 is the inlet of the concrete to be tested, and the other side is the outlet of the concrete to be tested, and the concrete to be tested is poured in through the inlet and flows through the steel bars 130 to reach the outlet.

[0031] In this embodiment, the concrete container 100 is a U-shaped trough, the side wall is made of insulating material, and a partition 110 is arranged inside. The upper end of the partition 110 is flush with the U-shaped trough container, and the lower end is provided with steel bars 130. The steel bars are arranged vertically downward and at equal intervals, and the lower ends of the steel bars 130 are welded to the bottom of the U-shaped trough container. A plurality of circular electrode pairs 120 are respectively arranged at the left and right ends of the U-shaped trough container. The electrode pairs 120 have different heights and equal spacing. The two electrodes of the same electrode pair 120 are respectively arranged on the inner wall of the U-shaped trough container and 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 be 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 position. The wire passes through the side wall of the U-shaped groove and is connected to the resistance test device 200 after being wired.

[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, etc. The number of switches 210 is the same as the number of electrode pairs 120, and the switches 210 correspond to the electrode pairs 120 one by one.

[0034] The switch controller 220 is used to control the closing of the switch 210 to ensure that only one electrode pair 120 is in a connected state at the same time. The resistance test module 250 is used to test the resistance value, and after sampling, communicates with the computer through the USB-485 converter 230. The computer can control the test time, sampling frequency and other parameters of the resistance test module 250 through a program, and control the switch controller 220 to determine the test position of the concrete resistance value. The power supply 260 of the resistance test device 200 is 220V AC.

[0035] Each set of electrode pairs 120 is respectively 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 at the inlet side of the concrete container is the same as the height of the concrete liquid level to be measured at the outlet side, obtain the resistance value measured by each electrode pair at the inlet side at each preset time point to obtain an inlet side resistance value list set A=(A1, A2, ..., A i , …, A n ), i=1, 2,...,n; among them, A i is a list of resistance values ​​measured for each electrode pair on the inlet side at the i-th time point, A i =(A i，1 , A i，2 , …, A i，j , …, A i，m ), j = 1, 2, ..., m; A i，j is the resistance value measured by the jth electrode pair on the inlet side at the i-th time point, m is the number of electrode pairs on the inlet side or outlet side; A i，r The height is less than A i，r+1 height; r = 1, 2,…, n-1.

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

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

[0039] In this embodiment, when each electrode pair on the inlet side is tested, the resistance value of the concrete to be tested measured by each electrode pair on the outlet side can be obtained at the same time, and then B can be obtained.

[0040] S300, according to A and B, determine the stability rate of the concrete to be tested at each preset time point to obtain a stability rate list S of the concrete to be tested = (S1, S2, ..., S i , …, S n ), where S i S is 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 is the bottom resistance difference, ΔR i，t is the top resistance difference, ΔR i，t Is the average resistance difference; 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 it is to 1, the greater the ΔR i，b With ΔR i，t The closer the stability rate is, the closer the volume fraction of the concrete coarse aggregate at the bottom and the top is at the i-th preset time, and the higher the stability of the concrete to be tested; the closer the stability rate is to 0, the higher the ΔR i，b With ΔR i，tThe greater the difference, the greater the difference in volume fraction of concrete coarse aggregate between the bottom and the top at the i-th preset time, and the lower the stability of the concrete to be tested.

[0042] S400, determining a stability rate time curve QT corresponding to the concrete to be tested according to S, so as to analyze and judge the settlement of the coarse aggregate in the concrete to be tested after passing through the steel bars through QT.

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

[0044] Furthermore, before step S100, target substance solutions with 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, obtaining the resistance value measured by each electrode pair at each height.

[0047] S020, fitting the resistance values ​​measured by each electrode pair at each height to obtain a target substance solution height resistance curve list C = (C1, C2, ..., C p , …, C 2m ), p = 1, 2, ..., 2m; where C p is the target substance solution height resistance curve corresponding to the p-th group of electrode pairs.

[0048] S030, obtaining the similarity between the target substance solution height resistance curve corresponding to each electrode pair in C and the corresponding standard target substance solution height resistance curve, so as to obtain a similarity list γ=(γ1, γ2, ..., γ p , …, γ 2m ), where γ p C p The similarity with the corresponding standard target substance solution height resistance curve.

[0049] In this embodiment, a calibrated electrode pair can be used to test the resistance value of the target substance solution at different heights in the concrete container to be tested to obtain a standard target substance solution height resistance curve; it should be noted that those skilled in the art can use the existing curve similarity determination method 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, traverse γ, if γ p <γ', the p-th group of electrode pairs is calibrated; wherein γ' is a preset curve similarity threshold.

[0051] In this embodiment, through the above steps, each group of electrode pairs can be calibrated to avoid the problem of inaccurate stability rate of the concrete to be measured due to inaccurate measurement of the electrode pairs; γ' can be an empirical value.

[0052] In order 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 concrete container is also divided into upper, middle and lower parts. After the concrete to be tested is initially set, separate the three parts of concrete and place the concrete to be tested on a 4.75mm sieve (aggregates larger than 4.75mm are called coarse aggregates). Rinse with water until the coarse aggregate slurry is completely washed away; then dry the coarse aggregate on the sieve and weigh the mass of the coarse aggregate in the upper, middle and lower parts. The stability of concrete is evaluated by the mass of the coarse aggregate. If this method is used, the stability of concrete can be expressed by S2, and the calculation formula is as follows:

[0054]

[0055] Among them, m b Indicates the mass of coarse aggregate in the lower concrete to be tested (in g); m t Indicates the mass of coarse aggregate in the upper concrete to be tested (in g); It represents the average mass of coarse aggregate of all concrete to be tested (in g).

[0056] Usually, coarse aggregate is divided into three ranges according to particle size: 4.75-9.5 mm, 9.5-16 mm and 16-19 mm; the particle size range distribution of coarse aggregate in concrete in different parts of the same test group is statistically analyzed; then the correlation between the two test methods is analyzed, and the results show that the two methods have a strong linear correlation, which demonstrates the feasibility and reliability of using the method in this embodiment to evaluate the stability of high-fluidity concrete.

[0057] The stability test system for high-fluidity concrete of the present embodiment can quickly, conveniently and accurately measure the stability of high-fluidity concrete, especially the stability when it is in a flowing state and passes through steel bars, and is useful for judging whether the density of concrete in a certain part of a high-fluidity concrete structure meets the design requirements and whether it can meet the safety needs of high fluidity. During the on-site test, different steel bar diameters or steel bar spacings can be set according to the actual construction organization requirements; the sampling frequency of the resistance, the single sampling time and the total test time can all be adjusted according to actual needs. The test system has a simple working principle, convenient operation, high test accuracy and a wide range of applications.

[0058] In addition, although the steps of the method in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0059] An embodiment of the present invention also provides a non-transitory computer-readable storage medium, which can be set in an electronic device to store at least one instruction or at least one program related to implementing a method in a method embodiment. 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 embodiment.

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

[0061] Computer readable signal media may include data signals propagated in baseband or as part of a carrier wave, in which readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Readable signal media may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0062] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0063] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., using an Internet service provider to connect through the Internet).

[0064] An embodiment of the present invention further provides an electronic device, comprising a processor and the aforementioned non-transitory computer-readable storage medium.

[0065] The electronic device is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0066] The electronic device is presented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: the at least one processor mentioned above, the at least one memory mentioned above, and a bus connecting different system components (including the memory and the processor).

[0067] The memory stores program codes, which can be executed by the processor, so that the processor executes the steps in 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 a program / utility having a set (at least one) of program modules, such program modules including but not limited to: an operating system, one or more application programs, other program modules and program data, each of which or some combination may include an implementation of a network environment.

[0070] The bus may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures.

[0071] The electronic device may also communicate with one or more external devices (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may communicate with one or more devices that enable a user to interact with the electronic device, and / or may communicate with any device (e.g., routers, modems, etc.) that enables the electronic device to communicate with one or more other computing devices. Such communication may be performed through an input / output (I / O) interface. Furthermore, the electronic device may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) through a network adapter. The network adapter communicates with other modules of the electronic device through a bus. It should be understood that, although not shown in the figure, other hardware and / or software modules may 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, etc.

[0072] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0073] An embodiment of the present invention further provides a computer program product, which includes program code. When the program product is run on an electronic device, the program code is used to enable the electronic device to execute the steps of the method according to various exemplary embodiments of the present invention described above in this specification.

[0074] Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present invention. It should also be understood by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the present invention.

Claims

1. A stability testing system for high-fluidity concrete, characterized in that: The system comprises: a concrete container and a resistance testing device; wherein a partition is arranged in the middle of the concrete container; a plurality of evenly distributed steel bars are arranged between the bottom of the partition and the bottom of the concrete container; a plurality of groups of electrode pairs are arranged in mirror images on both sides of the partition inside the concrete container, and the intervals between two adjacent groups of electrode pairs on the same side are the same; one side of the partition is an inlet for the concrete to be tested, and the other side is an outlet for the concrete to be tested, and the concrete to be tested is poured in through the inlet and flows through the steel bars to reach the outlet; each group of electrode pairs is respectively connected to the resistance testing device through 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 at the inlet side of the concrete container is the same as the height of the concrete liquid level to be measured at the outlet side, obtain the resistance value measured by each electrode pair at the inlet side at each preset time point to obtain an inlet side resistance value list set A=(A1, A2, ..., A i , …, A n ), i=1, 2,...,n; among them, A i is a list of resistance values ​​measured for each electrode pair on the inlet side at the i-th time point, A i =(A i，1 , A i，2 , …, A i，j , …, A i，m )、j=1,2,…,m;A i，j is the resistance value measured by the jth electrode pair on the inlet side at the i-th time point, m is the number of electrode pairs on the inlet side or outlet side; A i，r The height is less than A i，r+1 The height of; r = 1, 2, ..., n-1; S200, obtaining the resistance value measured by each electrode pair at the outlet at each preset time point to obtain an outlet resistance value list set B = (B1, B2, ..., B i , …, B n ); where B i is a list of resistance values ​​measured for each electrode pair on the outlet side at the i-th time point, B i =(B i，1 , B i，2 , …, B i，j , …, B i，m ); B i，j is the resistance value measured by the jth electrode pair on the outlet side at the i-th time point; B i，r The height is less than B i，r+1 Height; S300, according to A and B, determine the stability rate of the concrete to be tested at each preset time point to obtain a stability rate list S = (S1, S2, ..., S i , …, S n ); where S i is the stability rate of the concrete to be tested at the i-th preset time point; S i = (1-(ΔR i，b -ΔR i，t ) / ΔR i ); where ΔR i，b is the bottom resistance difference, ΔR i，t is the top resistance difference, ΔR i，t Is the average resistance difference; 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, according to S, determining a stability rate time curve QT corresponding to the concrete to be tested, so as to analyze and judge the settlement of the coarse aggregate in the concrete to be tested after passing through the steel bars through QT.

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

3. The stability testing system for high-fluidity concrete according to claim 2 is characterized in that: The target substance solution includes: sodium chloride solution.

4. The stability testing system for high-fluidity concrete according to claim 1, characterized in that: The resistance testing device comprises a plurality of switches, and each group of electrode pairs is connected to the resistance testing device via a switch.

5. The stability testing system for high-fluidity concrete according to claim 1 is characterized in that: The concrete container is a U-shaped trough; the material of the concrete container is insulating material.

6. The stability testing system for high-fluidity concrete according to claim 1, characterized in that: The distance between two adjacent steel bars is the same.

7. The stability testing system for high-fluidity 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 the wire.

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