Novel device and method for testing shearing strength of concrete in seawater environment

Abstract

The invention discloses a novel concrete shear strength seawater environment test device and a test method, and relates to the technical field of concrete mechanical property test.The novel concrete shear strength seawater environment test device comprises a test platform, a press unit is arranged on the test platform, a test unit is arranged in the press unit, and stirring units are arranged on the two sides of the test unit; the stirring unit extends into the testing unit, and concentration detection units are further arranged in the testing unit and on the testing platform; and a central positioning assembly is also arranged in the test container. According to the novel concrete shear strength seawater environment testing device and testing method, through the semi-submerged design of the testing container and medium isolation of the isolation pad, complete isolation of seawater and metal parts of a press machine is achieved, the corrosion rate of equipment is reduced, and the service life is longer; by arranging the stirring unit, chloride ion concentration layering is eliminated, and concentration deviation is reduced.

Description

Technical Field

[0001] This invention relates to the field of concrete mechanical property testing technology, and in particular to a novel test device and method for testing the shear strength of concrete in a seawater environment. Background Technology

[0002] In marine engineering projects such as cross-sea bridges, offshore platforms, and breakwaters, concrete structures are exposed to seawater for extended periods. Chloride ions can penetrate and diffuse into the concrete, causing steel corrosion and concrete cracking, ultimately leading to a decrease in the structure's shear strength and threatening project safety. Therefore, simulating real seawater environments to test the shear strength of concrete is a crucial step in assessing the durability and load-bearing capacity of concrete in marine engineering projects.

[0003] Existing concrete shear strength testing equipment faces the following core problems when dealing with seawater environments: Severe equipment corrosion: Traditional testing often uses a full immersion method, where seawater directly contacts the metal body of the press, loading mechanism and other components. Long-term use can easily cause metal corrosion, which not only shortens the service life of the equipment, but may also affect the test accuracy due to the jamming of corroded parts. The influence of seawater medium environmental parameters is uneven: After seawater is injected into the test container, chloride ions are prone to stratification due to gravity and insufficient convection, resulting in large differences in the degree of influence of seawater medium environmental parameters on different areas of the concrete specimen. The test results cannot reflect the shear performance under real seawater environment. Data correlation is missing: Existing devices can only output shear strength data or chloride ion concentration data separately, and cannot simultaneously record the dynamic correlation between chloride ion concentration changes and shear strength decay during the test, making it difficult to analyze the influence of seawater environmental parameters on shear mechanical properties. Summary of the Invention

[0004] The purpose of this invention is to provide a novel testing device and method for testing the shear strength of concrete in a seawater environment, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a novel concrete shear strength seawater environment testing device, comprising a testing platform, a press unit disposed on the testing platform, a testing unit disposed within the press unit, a stirring unit disposed on both sides of the testing unit, the stirring unit extending into the interior of the testing unit, and a concentration detection unit disposed inside the testing unit and on the testing platform. The test container is also equipped with a central positioning component.

[0006] Preferably, the press unit includes a placement platform disposed on the test platform, two support columns are disposed on both sides of the placement platform, the top ends of the two support columns are connected to the press body, and a power output head is disposed below the press body.

[0007] Preferably, the test unit includes a test container, the top of which has a placement groove, and a rubber sealing strip is provided in the placement groove, the rubber sealing strip being in contact with the power output head; The inner wall of the test container is provided with liquid level scale lines; The outer wall of the test container is wrapped with a buffer layer; The test container also has a water outlet on its side wall, and a drain valve is provided at the water outlet, with a built-in filter screen in the drain valve.

[0008] Preferably, the test container is placed on an isolation pad, the isolation pad is fixedly placed on the placement platform, and supports are provided on both sides of the isolation pad. Supports are provided on the supports, and the support is connected to the rubber sealing strip.

[0009] Preferably, the stirring unit includes a bracket mounted on the placement platform, a fixing frame mounted on the bracket, a speed-regulating motor mounted above the fixing frame, a transmission rod fixedly connected to the output end of the speed-regulating motor, and a plurality of propeller blades mounted on the lower part of the transmission rod. The outer surface of the propeller blades is coated with an anti-corrosion coating.

[0010] Preferably, the installation height of the propeller blade is less than 1 / 2 of the liquid level scale line, and the distance between the edge of the propeller blade and the side wall of the test container is not less than 20mm.

[0011] Preferably, the concentration detection unit includes a chloride ion sensor embedded in the inner wall of the test container. The chloride ion sensor is electrically connected to a data logger via a data transmission line. The data logger is equipped with a wireless transmission module, and the data logger transmits data to a terminal device through the wireless transmission module.

[0012] Preferably, the center positioning component includes a positioning post disposed at the center of the test container, a bottom plate disposed above the positioning post, a fixing block one disposed at one end of the bottom plate, a fixing block two disposed at the other end of the bottom plate, an adjusting block disposed between the fixing block two and the fixing block one, the outer end of the adjusting block being rotatably connected to one end of an adjusting screw, the other end of the adjusting screw passing through the fixing block two, and a fixing member disposed at the end of the adjusting screw.

[0013] Preferably, both the fixing block and the adjusting block have anti-slip pads on their inner sides.

[0014] A test method for a novel concrete shear strength testing device in a seawater environment includes the following steps: Step S1: Lay the isolation pad on the placement platform, place the test container on the isolation pad, and ensure that the center of the test container is aligned with the loading center of the press body; Step S2: Connect the control systems of the mixing unit and the press unit, test the linkage function, start the press unit under no-load operation, and confirm that the mixing unit starts synchronously; stop the press to ensure that the mixing components stop synchronously. Step S3: Embed the chloride ion sensor into the reserved hole on the side wall of the test container, seal the gap between the chloride ion sensor and the test container, connect the chloride ion sensor and the data logger, turn on the data logger, debug the wireless transmission function, and ensure that the terminal device can receive real-time concentration data. Step S4: Prepare simulated seawater with a concentration of 3.5%; Step S5: Clean the surface of the concrete specimen, place it in the center of the center positioning component, and fix it in place; Step S6: Slowly inject the prepared simulated seawater into the test container until the seawater level is aligned with the liquid level mark. Observe the sealing of the container during the injection process to ensure there is no leakage. Step S7: Turn on the data logger and confirm that the chloride ion concentration data acquisition is normal; Step S8: Start the press. The press begins to apply shear load to the specimen, and the stirring assembly starts simultaneously. Step S9: During the test, the chloride ion concentration curve and shear load curve are monitored in real time through the terminal device, and the surface condition of the specimen is observed. Step S10: When the load curve of the press shows a significant decrease, it is determined that the specimen has suffered shear failure, the press automatically stops loading, and the stirring assembly stops synchronously. Step S11: Open the drain valve of the test container to drain the seawater. After the seawater has drained, loosen the adjusting block and take out the damaged concrete specimen. Step S12: Export test data from the data logger; Step S13: Clean the inside of the test container, replace it with new simulated seawater, and conduct the next set of specimen tests.

[0015] Therefore, the present invention employs the above-mentioned novel concrete shear strength seawater environment testing device and method, which has the following beneficial effects: (1) Significant corrosion protection: This device achieves complete isolation between seawater and the metal parts of the press by using the semi-immersion design of the acrylic test container and the medium isolation of the polytetrafluoroethylene isolation pad. The corrosion rate of the equipment is reduced to less than 0.001 mm / year, and the service life is extended by 3 to 5 times compared with traditional devices, while reducing equipment maintenance costs.

[0016] (2) High test accuracy: This device eliminates chloride ion concentration stratification by designing a stirring component, ensuring the consistency of the immersion area of ​​the concrete specimen under the influence of seawater medium environmental parameters, so that the concentration deviation is ≤2%.

[0017] (3) High data value: This device can simultaneously collect chloride ion concentration and shear load data, and construct a dynamic correlation of "seawater medium environment parameters-shear mechanical response". It can be directly used to analyze the differences in concrete shear bearing response under different chloride ion concentrations, and provide a quantitative basis for the durability design of marine engineering concrete structures.

[0018] (4) Convenient and efficient operation: The linkage control of the stirring unit and the press unit in this device and the wireless remote monitoring shorten the test time of a single set of specimens to less than 30 minutes, and the efficiency is 50% higher than that of traditional devices.

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a novel concrete shear strength testing device in a seawater environment according to the present invention; Figure 2 This is a three-dimensional structural schematic diagram of a novel concrete shear strength testing device in a seawater environment according to the present invention; Figure 3 This is a schematic diagram of the mixing unit of a novel concrete shear strength seawater environment testing device according to the present invention; Figure 4 This is a cross-sectional view of a novel concrete shear strength testing device in a seawater environment according to the present invention. Figure 5 This is a schematic diagram of the central positioning component of a novel concrete shear strength seawater environment testing device according to the present invention; Reference numerals: 1. Test platform; 2. Press unit; 21. Placement platform; 22. Support column; 23. Press body; 24. Power output head; 3. Test unit; 30. Test container; 31. Rubber sealing strip; 32. Water outlet; 33. Drain valve; 34. Isolation pad; 35. Support; 36. Column; 4. Stirring unit; 41. Bracket; 42. Fixing frame; 43. Speed ​​regulating motor; 44. Transmission rod; 45. Propeller blade; 5. Concentration detection unit; 51. Chloride ion sensor; 52. Data transmission line; 53. Data logger; 6. Center positioning component; 61. Positioning column; 62. Bottom plate; 63. Fixing block one; 64. Fixing block two; 65. Adjusting block; 66. Adjusting screw; 67. Fixing component; 68. Anti-slip pad. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] 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. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example Please see Figures 1-5 This invention provides a novel test device for the shear strength of concrete in a seawater environment, comprising a test platform 1, a press unit 2 mounted on the test platform 1, a test unit 3 mounted inside the press unit 2, stirring units 4 mounted on both sides of the test unit 3 extending into the test unit 3, and a concentration detection unit 5 mounted inside the test unit 3 and on the test platform 1. A center positioning component 6 is also mounted inside the test container 30.

[0024] The press unit 2 includes a placement platform 21 set on the test platform 1. Two support columns 22 are set on both sides of the placement platform 21. The tops of the two support columns 22 are connected to the press body 23. A power output head 24 is set below the press body 23.

[0025] Test unit 3 includes a test container 30, which is made of high-strength transparent acrylic material (light transmittance ≥92%, compressive strength ≥80MPa, flexural strength ≥100MPa). This material not only allows for visual observation of the specimen's condition during testing but also provides excellent seawater corrosion resistance, preventing the container itself from being corroded by seawater and contaminating the test environment. The top of the test container 30 has a placement groove containing a rubber sealing strip 31 (Shore hardness 50±5, seawater aging resistance ≥5000h). The rubber sealing strip 31 is in contact with the liquid and fits tightly against the bottom of the power output head 24 to prevent seawater splashing during stirring. The inner wall of the test container 30 has a liquid level scale with an accuracy of 1mm. Combined with the specimen positioning component, this precisely controls the seawater to only submerge half the height of the concrete specimen, ensuring sufficient contact between the specimen and seawater to simulate real corrosion while preventing excessive seawater contact with the equipment.

[0026] The outer wall of the test container 30 is covered with a 5mm thick transparent EVA buffer layer to cushion the vibration and impact during press loading, preventing the test container 30 from cracking due to vibration. An outlet 32 ​​is also provided on the side wall of the test container 30, and a drainage valve 33 made of corrosion-resistant plastic is installed at the outlet 32. The drainage valve 33 has a built-in filter screen with a pore size of 0.5mm, which can quickly discharge seawater after the test and simultaneously filter concrete debris to prevent clogging.

[0027] The test container 30 is placed on a polytetrafluoroethylene (PTFE) isolation pad 34 (temperature resistance range of 200℃~260℃, seawater corrosion resistance level 1). The isolation pad 34 is fixedly placed on the placement platform 21. Supports 35 are provided on both sides of the isolation pad 34, and support columns 36 are provided on the support columns 35. The support columns 36 are connected to the rubber sealing strip 31. The isolation pad 34 isolates seawater from the metal parts of the press unit 2 to prevent equipment corrosion.

[0028] The stirring unit 4 is used to eliminate chloride ion concentration stratification in seawater, ensuring the stability and repeatability of environmental parameters in the immersion zone. The stirring unit 4 includes a bracket 41 mounted on a platform 21, a fixing frame 42 mounted on the bracket 41, and a speed-regulating motor 43 mounted above the fixing frame 42. The speed-regulating motor 43 has a power of 20W and supports stepless speed regulation from 50r / min to 200r / min, allowing adjustment of the stirring speed according to the seawater volume (5L to 10L) to ensure uniform mixing of different volumes of seawater. A transmission rod 44 is fixedly connected to the output end of the speed-regulating motor 43. Multiple propeller blades 45 are mounted on the lower part of the transmission rod 44. The propeller blades 45 are made of 316L stainless steel and coated with a polyvinylidene fluoride (PVDF) anti-corrosion coating (coating thickness 50μm to 80μm, salt spray corrosion resistance ≥5000h), ensuring blade strength while preventing seawater corrosion. The installation height of the propeller blade 45 is lower than 1 / 2 of the liquid level mark, and the distance between the edge of the propeller blade 45 and the side wall of the test container 30 is not less than 20mm. This prevents seawater from splashing and overflowing during stirring, and also avoids noise or damage caused by the collision between the blade and the container.

[0029] The concentration testing component is used to collect seawater chloride ion concentration data in real time during the test and synchronously correlate it with the shear load data of the press to establish a data relationship of "seawater medium environmental parameters - shear mechanical response correlation". The concentration detection unit 5 includes a chloride ion sensor 51 (measurement range 0~10000mg / L, measurement accuracy ±1%FS) embedded in the inner wall of the test container 30. The sensor probe extends into the seawater but does not contact the specimen to avoid interference from concrete debris with the sensor's detection accuracy. The chloride ion sensor 51 is electrically connected to the data logger 53 (sampling frequency adjustable from 1Hz to 10Hz) via a data transmission line 52. The data logger 53 can store chloride ion concentration data in real time and communicate with the control system of the press unit 2 via an RS485 interface to synchronously collect the shear load data output by the press. The data logger 53 is equipped with a wireless transmission module (supporting WiFi / Bluetooth dual-mode transmission). The data logger 53 transmits data to terminal devices such as computers and tablets via the wireless transmission module, allowing operators to remotely monitor the test process without close contact with the test area, thus improving operational safety.

[0030] The Data Logger 53 has a built-in 8GB storage space, which can store more than 1,000 sets of complete test data (including chloride ion concentration curves and shear load curves). It supports export in Excel and TXT formats, which is convenient for subsequent data processing and analysis.

[0031] The mixing component and the main body of the press are linked for control. When the press starts loading, the mixing component starts synchronously; when the press stops loading (the specimen is damaged or the test ends), the mixing component stops automatically, reducing manual operation steps and improving testing efficiency.

[0032] The center positioning component 6 includes a positioning post 61 positioned at the center of the test container 30. A bottom plate 62 is positioned above the positioning post 61. A fixing block 63 is located at one end of the bottom plate 62, and a fixing block 64 is located at the other end. An adjusting block 65 is positioned between the fixing block 64 and the fixing block 63. The outer end of the adjusting block 65 is rotatably connected to one end of an adjusting screw 66. The other end of the adjusting screw 66 passes through the fixing block 64, and a fixing member 67 is provided at the end of the adjusting screw 66. Anti-slip pads 68 are provided on the inner sides of both the fixing block 63 and the adjusting block 65. The center positioning component 6 enables partial immersion of the concrete specimen, facilitating equipment corrosion protection and simulating the tidal / splash environment of marine engineering.

[0033] The testing method for the above-mentioned novel concrete shear strength seawater environment testing device includes the following steps: This embodiment uses a 100mm×100mm×50mm cubic concrete specimen (commonly used C40 marine concrete in marine engineering) as an example to test the shear strength under a 3.5% concentration of simulated seawater (corresponding to the chloride ion concentration in the ocean surface water).

[0034] Step S1: Lay the isolation pad 34 on the placement platform 21, and place the test container 30 (300mm×300mm×200mm, volume about 12L) on the isolation pad 34, ensuring that the center of the test container 30 is aligned with the loading center of the press body 23. Step S2: Connect the control systems of the mixing unit 4 and the press unit 2, test the linkage function, start the press unit 2 under no-load operation, and confirm that the mixing unit 4 starts synchronously; stop the press to ensure that the mixing components stop synchronously. Step S3: Embed the chloride ion sensor 51 into the reserved hole on the side wall of the test container 30, seal the gap between the chloride ion sensor 51 and the test container 30, connect the chloride ion sensor 51 and the data logger 53, turn on the data logger 53, debug the wireless transmission function, and ensure that the terminal device can receive real-time concentration data. Step S4: Prepare a 3.5% concentration of simulated seawater using distilled water and analytical grade sodium chloride. Add 350g of sodium chloride to every 10L of distilled water, stir to dissolve, and let stand for 1 hour. Step S5: Clean the surface of the concrete specimen, remove surface dust and debris, place it in the center of the center positioning component 6, rotate the adjusting screw 66, push the adjusting block 65 towards the specimen, until the anti-slip pad 68 is in close contact with the side wall of the specimen, clamp the specimen, the clamping force should be such that the specimen does not shake, avoid excessive clamping which may cause the specimen to break. Step S6: Slowly inject the prepared simulated seawater into the test container 30 until the seawater level is aligned with the liquid level scale line. At this time, the seawater only submerges the specimen to a height of 25mm. Observe the sealing of the container during the injection process to ensure that there is no leakage. Step S7: Turn on the data logger 53, set the sampling frequency to 5Hz, and confirm that the chloride ion concentration data acquisition is normal; Step S8: Start the press, set the loading rate to 1 mm / min, the press begins to apply shear load to the specimen, and the stirring assembly starts synchronously, with the rotation speed set to 120 r / min; Step S9: During the test, the chloride ion concentration curve and shear load curve are monitored in real time through the terminal device, and the surface condition of the specimen is observed, including the appearance of cracks, peeling, etc. Step S10: When the load curve of the press shows a significant decrease, and the decrease exceeds 15% of the peak load, it is determined that the specimen has suffered shear failure, the press automatically stops loading, and the stirring assembly stops synchronously. Step S11: Open the drain valve 33 of the test container 30 to drain the seawater. After the seawater has drained, loosen the adjusting block 65 and take out the damaged concrete specimen. Step S12: Export test data from data logger 53; In this embodiment, the shear strength of C40 marine concrete in a 3.5% seawater environment decreased by 18.2% compared to a fresh water environment.

[0035] Step S13: Clean the inside of the test container 30, replace it with new simulated seawater, and conduct the next set of test specimens.

[0036] Multiple sets of specimens were tested. Finally, based on the test data of the comparative analysis of the shear peak values ​​under multiple chloride ion concentration conditions, three-dimensional data of chloride ion concentration-time-shear load were obtained, and the relationship curve between the peak shear load and chloride ion concentration was plotted.

[0037] Therefore, the present invention adopts the above-mentioned novel concrete shear strength seawater environment testing device and testing method. By using the semi-submerged design of the test container and the medium isolation of the isolation pad, the seawater is completely isolated from the metal parts of the press, reducing the equipment corrosion rate and extending the service life. By setting up a stirring unit, the chloride ion concentration stratification is eliminated, reducing the concentration deviation.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A novel device for testing the shear strength of concrete in seawater environment, characterized in that: The device includes a testing platform, a press unit, a testing unit, and stirring units on both sides of the testing unit, which extend into the testing unit. A concentration detection unit is also provided inside the testing unit and on the testing platform. The test container is also equipped with a central positioning component.

2. The novel concrete shear strength seawater environment testing device according to claim 1, characterized in that: The press unit includes a placement platform set on the test platform. Two support columns are provided on both sides of the placement platform. The tops of the two support columns are connected to the press body. A power output head is provided below the press body.

3. The novel concrete shear strength seawater environment testing device according to claim 2, characterized in that: The test unit includes a test container, the top of which has a placement slot, and a rubber sealing strip is provided in the placement slot, the rubber sealing strip being in contact with the power output head; The inner wall of the test container is provided with liquid level scale lines; The outer wall of the test container is wrapped with a buffer layer; The test container also has a water outlet on its side wall, and a drain valve is provided at the water outlet, with a built-in filter screen in the drain valve.

4. The novel concrete shear strength seawater environment testing device according to claim 3, characterized in that: The test container is placed on an isolation pad, which is fixedly mounted on the placement platform. Supports are provided on both sides of the isolation pad, and pillars are provided on the supports, which are connected to the rubber sealing strip.

5. The novel concrete shear strength seawater environment testing device according to claim 4, characterized in that: The stirring unit includes a bracket set on the placement platform, a fixed frame set on the bracket, a speed-regulating motor set above the fixed frame, a transmission rod fixedly connected to the output end of the speed-regulating motor, and multiple propeller blades set at the lower part of the transmission rod. The outer surface of the propeller blades is coated with an anti-corrosion coating.

6. The novel concrete shear strength seawater environment testing device according to claim 5, characterized in that: The installation height of the propeller blade is less than 1 / 2 of the liquid level scale line, and the distance between the edge of the propeller blade and the side wall of the test container is not less than 20mm.

7. The novel concrete shear strength seawater environment testing device according to claim 6, characterized in that: The concentration detection unit includes a chloride ion sensor embedded in the inner wall of the test container. The chloride ion sensor is electrically connected to a data logger via a data transmission line. The data logger is equipped with a wireless transmission module, and the data logger transmits data to a terminal device through the wireless transmission module.

8. The novel concrete shear strength seawater environment testing device according to claim 7, characterized in that: The center positioning component includes a positioning post disposed at the center of the test container. A bottom plate is disposed above the positioning post. A fixing block 1 is disposed at one end of the bottom plate, and a fixing block 2 is disposed at the other end of the bottom plate. An adjusting block is disposed between the fixing block 2 and the fixing block 1. The outer end of the adjusting block is rotatably connected to one end of an adjusting screw. The other end of the adjusting screw passes through the fixing block 2, and a fixing member is disposed at the end of the adjusting screw.

9. The novel concrete shear strength seawater environment testing device according to claim 8, characterized in that: Both the fixed block and the adjusting block have anti-slip pads on their inner sides.

10. A test method using the novel concrete shear strength seawater environment test device according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step S1: Lay the isolation pad on the placement platform, place the test container on the isolation pad, and ensure that the center of the test container is aligned with the loading center of the press body; Step S2: Connect the control systems of the mixing unit and the press unit, test the linkage function, start the press unit under no-load operation, and confirm that the mixing unit starts synchronously; stop the press to ensure that the mixing components stop synchronously. Step S3, embed the chloride ion sensor into the reserved hole of the side wall of the test container, seal the gap between the chloride ion sensor and the test container, connect the chloride ion sensor with the data logger, turn on the data logger, debug the wireless transmission function, and ensure that the terminal device can receive real-time concentration data; Step S4, configure 3.5% concentration of simulated seawater; Step S5, clean the surface of the concrete test piece, place it in the center position of the center positioning assembly, and fix it; Step S6, slowly inject the prepared simulated seawater into the test container until the water level aligns with the liquid level scale line, observe the container sealing condition during the injection process to ensure no leakage; Step S7, turn on the data logger and confirm that the chloride ion concentration data collection is normal; Step S8, start the press, the press starts to apply shear load to the test piece, and the stirring assembly is started at the same time; Step S9, during the test, real-time monitor the chloride ion concentration curve and the shear load curve through the terminal device, and observe the surface state of the test piece; Step S10, when the load curve of the press appears obvious decline, it is determined that the test piece has shear failure, the press automatically stops loading, and the stirring assembly is stopped at the same time; Step S11, open the drain valve of the test container to drain the seawater, and after the seawater is drained, loosen the adjusting block and take out the damaged concrete test piece; Step S12, export the test data from the data logger; Step S13, clean the inside of the test container, replace the new simulated seawater, and test the next group of test pieces.

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