Device and method for simulating temperature-water flow-salt common erosion of concrete

Abstract

The invention discloses a device and a method for simulating temperature-water flow-salt common erosion of concrete. The device comprises an erosion device, a liquid supply unit and a display unit, the erosion device is used for simultaneously simulating one-way erosion of concrete in temperature, water flow and salt environments; and the liquid supply unit is used for accurately distributing an erosion solution to each erosion device, so that the multi-unit synchronous liquid supply requirement is met. And the display unit is used for displaying temperature, flow velocity and erosion time parameters in the erosion device, collecting and visualizing working condition data of each test unit in real time, and providing a visual basis for experimental process monitoring and parameter regulation and control. According to the invention, one-way erosion of concrete in a temperature-water flow-salt environment can be simulated at the same time, the environment temperature is simulated, and the water flow velocity range is 0.01 m / s-0. 1 m / s and the ion species and concentration are simulated.

Description

Technical Field

[0001] This invention relates to the field of concrete durability testing technology, specifically to a simulation device and method for the co-erosion of concrete by temperature, water flow and salt. Background Technology

[0002] Civil engineering infrastructure construction is increasingly geared towards extreme environments and weather conditions. Furthermore, due to rock weathering, sulfate ions infiltrate into the ground, resulting in high levels of sulfate ions in tunnel groundwater, with geothermal water reaching concentrations as high as 10277 mg / L. High temperatures reduce compressive strength, leading to later-stage strength loss in concrete and increasing the risk of cracking in the lining structure. The reaction of sulfate ions with silicate cement hydration products to form gypsum (CaSO4) and ettringite (6CaO·Al2O3·3SO3·32H2O) results in a volume increase of up to 2.2 times, causing expansion stress-induced cracking and surface spalling. Moreover, the transport and erosion rates of sulfate ions are affected by ambient temperature; high temperatures accelerate ion transport and erosion reactions, shortening the expansion stage and accelerating concrete structural damage. Water erosion not only accelerates the penetration of corrosive ions into concrete but can also directly cause physical damage to the concrete surface. High-speed water erosion can lead to surface wear and spalling, exposing more of the internal structure to corrosive ions. In addition, water erosion may also alter the microstructure of the concrete surface, affecting its interaction with corrosive ions.

[0003] Current research on the sulfate resistance of concrete mainly involves immersing specimens completely in a 5% solution or using the wet-dry cycle method (14.0.4) in the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" (GB / T50082-2024). However, in underground structures such as tunnel lining concrete and sewage pipe concrete, the actual service life of concrete is not only affected by corrosive ions, but also by the scouring effect of groundwater flow, ion erosion, and temperature on the rock wall side. It is impossible to reasonably simulate the combined effects of water scouring, ion erosion, and temperature in the actual service environment. It is particularly noteworthy that these effects often only act on one side of the concrete, which is significantly different from the traditional wet-dry cycle method and solution immersion method.

[0004] In the existing technology, many scholars have conducted in-depth research on the durability performance of concrete in high geothermal environments through indoor test devices and methods. For example, invention patent CN117723476 discloses "A test device and method for the durability of tunnel lining concrete in high geothermal environments".

[0005] However, existing research methods and simulation devices do not consider concrete durability test devices under the combined effects of temperature, water flow and erosion salt. They have not solved the problems of synergistic effects of temperature, water flow and erosion salt and unilateral erosion simulation, which affects the research and development of tunnel lining concrete materials and the prediction of the service performance of tunnel lining concrete. Summary of the Invention

[0006] In order to overcome the above technical problems, the purpose of this invention is to provide a simulation device and method for the co-erosion of concrete by temperature, water flow and salt. The device and method can simultaneously simulate the unidirectional erosion of concrete in a temperature-water flow-salt environment, simulate the ambient temperature, simulate the water flow velocity range of 0.01m / s-0.1m / s, and simulate the ion types and concentrations.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A simulation device for the combined erosion of concrete by temperature, water flow, and salt includes an erosion device 3, a liquid supply unit, and a display unit.

[0009] The erosion device 3 is used to simultaneously simulate the unidirectional erosion of concrete specimens in temperature, water flow and salt environments.

[0010] The liquid supply unit is used to accurately distribute the erosion solution to each erosion device 3, meeting the needs of simultaneous liquid supply to multiple units.

[0011] The display unit is used to display the temperature, flow rate and erosion time parameters in the erosion device 3, and to collect and visualize the operating data of each test unit in real time, providing an intuitive basis for monitoring the experimental process and adjusting parameters.

[0012] The erosion device 3 includes a heating tube 16, a temperature sensor 17, a pressure regulating valve 18, a liquid holding tank 14, and a temperature controller 13.

[0013] The bottom of the liquid tank 14 is hollowed out, the heating tube 16 is located in the center of the liquid tank 14, the temperature sensor 17 is located at the bottom of the liquid tank 14, and the temperature sensor 17 displays the measured temperature on the temperature-flow rate display 12.

[0014] The liquid tank 14 is arranged in two rows, and each row of adjacent liquid tanks 14 is connected by a stainless steel pipe. A pressure regulating valve 18 is provided above the pipe to adjust the water flow rate.

[0015] The liquid-holding tanks 14 at the two ends are connected by U-shaped connecting pipes 15 to achieve solution circulation.

[0016] The top of the liquid tank 14 is a sealing device, which can effectively prevent the evaporation of the solution. The bottom is engraved with slots and waterproof sleeves 19 for placing corrosion test pieces every 25cm. These slots and waterproof sleeves 19 have excellent corrosion resistance. The heating tube 16, temperature sensor 17, pressure regulating valve 18, waterproof gasket 20, bottom hollow liquid tank 14, and temperature controller 13 simultaneously simulate the effects of temperature, water flow and salt corrosion.

[0017] The heating tube 16 has a heating rate of 20℃ / h and a heating temperature range of 20℃-100℃; the temperature sensor 17 is in contact with the bottom of the liquid tank 14 and is used to detect the temperature of the solution in the liquid tank 14 with high accuracy.

[0018] The slots are divided into two specifications of specimens: 100×100×100mm cube specimen slots (a set of four) 20 and 400×100×100mm prism specimen slots 21 (a set of one);

[0019] The card slot is provided with a liquid injection / drainage port 22.

[0020] A waterproof sleeve 19 is provided on the outside of the slot. The inner diameter of the waterproof sleeve 19 is 0.5-1mm larger than the outer diameter of the specimen. The sleeve is elastically deformed to tightly wrap the specimen, forming a sealed structure to effectively prevent solution leakage.

[0021] Waterproof gaskets are provided on the 100×100×100mm cubic specimen slot 20 and the 400×100×100mm prism specimen slot 21.

[0022] The stainless steel pipe circulates the solution in the liquid tank 14; the pressure regulating valve 18 is used to regulate the water pressure of the corrosive solution in the stainless steel pipe; the heating tube 16, the temperature sensor 13, and the pressure regulating valve 18 are connected by wires.

[0023] The liquid holding tank 14 is made of transparent tempered glass, which has excellent corrosion resistance and facilitates real-time observation of the specimen status. The waste liquid in the liquid holding tank 14 is transported to the waste liquid placement tank 6 through the liquid injection / drainage port 22 and the liquid drainage pipe 11, and is equipped with a neutralization treatment module.

[0024] The display unit is a temperature-flow rate display 12, located outside the liquid tank 14. It can display the solution temperature and flow rate in the liquid tank 14 in real time for real-time parameter monitoring and feedback adjustment.

[0025] The erosion device 3 provides erosion solution through a liquid supply unit, which includes a liquid supply tank 7. The liquid supply tank 7 stores the erosion solution and connects the erosion solution to a liquid collection tank 14 through an injection pipe 10. The waste liquid in the liquid collection tank 14 is connected to a drain pipe 11 through an injection / drainage port 22. The output end of the drain pipe 11 is connected to a waste liquid storage tank 6. The waste liquid storage tank 6 is equipped with a neutralization treatment module.

[0026] A small water pump 5 is installed on the liquid supply tank 7, which provides pressure for the input solution; the waste liquid storage tank 6 is located on the right rear side of the experimental device.

[0027] A screw-type stirring assembly 8 is installed inside the liquid supply tank 7. The screw-type stirring assembly 8 evenly stirs the corrosive salt added to the liquid supply tank 7 to ensure that it is fully dissolved.

[0028] A support plate is installed above the injection pipe 10 and the drainage pipe 11, and the support plate is used to support the erosion device 3.

[0029] A method for using a simulation device for the co-erosion of concrete by temperature, water flow and salt. The simulation device for the co-erosion of concrete by temperature, water flow and salt consists of three units: an erosion device 3, a liquid supply unit and a display unit.

[0030] The erosion device 3 is used to simultaneously simulate the unidirectional erosion of concrete in temperature, water flow and salt environment. By fixing the cube or prism specimen in the slot, only the top surface of the specimen is exposed. With the help of the environmental control component, a gradient temperature field, directional pressure water flow and salt erosion are applied to the top surface. The slot limits and fixes the other surfaces of the specimen, which can ensure the stability of the specimen position during the test and eliminate lateral interference.

[0031] The liquid supply unit is used to accurately distribute the erosion solution to each test unit, meeting the needs of simultaneous liquid supply to multiple units.

[0032] The display unit is used to display parameters such as temperature, flow rate and erosion time in the test unit, and to collect and visualize the operating data of each test unit in real time, providing an intuitive basis for monitoring the experimental process and adjusting parameters.

[0033] Includes the following steps:

[0034] Place the cube or prism specimen in the slot, prepare the sodium sulfate solution, add the prepared sulfate to the supply tank 7, stir the screw-type stirring assembly 8 to dissolve it evenly in the water, and then transport it to the holding tank 14.

[0035] The slot is used to fix the cube or prism specimen, so that only the top surface of the specimen is exposed and the other surfaces are limited and fixed by the slot. After the power is turned on, turn on the pumping system switch control panel 9 in the liquid supply tank 7, turn on the small water pump 5, and inject the erosion solution into the liquid tank 14. Set the erosion temperature and flow rate on the temperature-flow rate display 12. Then the heating tube 16 heats the solution temperature and the pressure regulating valve 18 adjusts the solution flow rate between the pipes to achieve the flushing effect.

[0036] Once the specimen reaches the set corrosion age, remove the specimen, wipe the surface moisture with a towel, and then conduct durability performance tests on the corroded specimen.

[0037] The heating element 16 and the pressure regulating valve 18 stop working. The pumping system switch control panel 9 is turned on, and the waste liquid in the liquid tank 14 is collected and recycled into the waste liquid storage tank 6 through the drain port 22. Then the test piece is taken out for performance testing.

[0038] The heating element 16 is temperature-controlled by the temperature controller 13. The heating element 16 operates and heats up, with a heating range of 20℃-100℃.

[0039] The pressure regulating valve 18 is set with flow velocity parameters, simulating a flow velocity range of 0.01m / s-0.1m / s.

[0040] In the liquid tank 14, the power supply of the device is turned on, and the temperature is set to 20℃-100℃, the simulated flow rate range is 0.01m / s-0.1m / s, and the concentration of corrosive ions can be selected.

[0041] The water in the liquid tank 14 circulates and the flow rate can be set, while the erosion effect is only produced on one side of the erosion specimen.

[0042] The temperature sensor 13 is connected to the electronic display 12, which records temperature, flow rate and erosion duration data in real time.

[0043] The beneficial effects of this invention are:

[0044] 1. The component preparation and research methods of this experiment are novel and reasonable, the experimental method is simple and easy to operate, and it can effectively achieve the experimental expectations;

[0045] 2. The research method of this invention can effectively solve the problem of unstable water temperature during the erosion test. By using a constant temperature heating device with a heating temperature range of 20℃-100℃, the accuracy of the test can be effectively guaranteed and the test error can be reduced.

[0046] 3. In this invention, each test unit can be configured to simulate the effect of temperature by setting only the temperature parameter, or the entire unit can be configured with the same temperature and flow rate for batch simulation;

[0047] 4. The test units of this invention are equipped with pressure regulating valves to adjust the flow rate of the erosion solution during circulation;

[0048] 5. In the test unit of this invention, heating pipes and pressure regulating valves are used to simultaneously erode concrete specimens through temperature and water flow. The slots for cubic and prism specimens expose only the top surface of the specimen to the erosion environment, realizing the synergistic effect of temperature, water flow and erosion salt and simulating the problem of unilateral erosion. The performance of the eroded specimens is tested to provide data support for improving and predicting the performance of materials under specific conditions. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall structure of an experimental device for studying the long-term performance evolution of concrete in an environment with the combined effects of temperature, water flow, and corrosive salts, according to the present invention.

[0050] Figure 2 This is a structural diagram of the test unit in the test apparatus of the present invention.

[0051] Figure 3 This is a top view of the erosion device in this invention.

[0053] 1-Sealing cover plate, 2-Induction lamp, 3-Erosion device, 4-Water filling switch, 5-Small water pump, 6-Waste liquid storage tank, 7-Supply tank, 8-Screw-type stirring assembly, 9-Pumping system switch control panel, 10-Injection pipe, 11-Drainage pipe, 12-Temperature-flow rate display, 13-Controller, 14-Liquid tank, 15-U-shaped connecting pipe, 16-Heating tube, 17-NT temperature-flow rate sensor, 18-Pressure regulating valve, 19-Waterproof sleeve, 20-100×100×100mm cubic specimen slot, 21-400×100×100mm prism specimen slot, 22-Injection / drainage port. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to the accompanying drawings.

[0055] Example

[0056] An experimental apparatus and research method for studying the long-term performance evolution of concrete in an environment with combined effects of temperature, water flow, and corrosive salts, such as... Figure 1-3As shown, it includes: 1-sealing cover plate, 2-sensor light, 3-erosion device, 4-water filling switch, 5-small water pump, 6-waste liquid storage tank, 7-supply tank, 8-screw type stirring assembly, 9-pumping system switch control panel, 10-liquid injection pipe, 11-liquid drainage pipe, 12-temperature-flow rate display, 13-controller, 14-liquid tank, 15-U-shaped connecting pipe, 16-heating pipe, 17-NT temperature-flow rate sensor, 18-pressure regulating valve, 19-waterproof sleeve, 20-100×100×100mm cubic specimen slot, 21-400×100×100mm prism specimen slot, 22-liquid injection / drainage port.

[0057] In one embodiment, the in-tank erosion device 3 has 8 sets, and the injection / drainage port 22 is connected to the drainage pipe 11. When adding the erosion solution, the small water pump 5 adds water to the liquid tank 14 through the injection / drainage port 22, and the liquid level must be above the heating pipe 16;

[0058] Furthermore, the scale on the side of the liquid tank 14 corresponds to the volume of water added, which facilitates the calculation of the solution concentration. The waste solution is collected into the waste liquid storage tank 6 through the liquid injection / drainage port 22 and the liquid drainage pipe 11.

[0059] In one embodiment, the test block is placed in a waterproof gasket in a 100×100×100mm cubic test specimen slot 20 or a 400×100×100mm prism test specimen slot 21, with one side serving as the eroded surface.

[0060] In one embodiment, the temperature-flow rate display 12 displays the temperature and erosion duration for each test group.

[0061] In one embodiment, the solution temperature in the liquid tank 14 is between 20°C and 100°C.

[0062] Example 1

[0063] The experimental apparatus and research method for testing the long-term performance evolution of concrete in an environment of combined temperature, water flow, and corrosive salt include the following steps: Four 100×100×100mm C60 concrete cube specimens are placed in slot 20. 500g of sodium sulfate is weighed and added to the supply tank 7. The screw-type stirring assembly 8 is turned on, and the sodium sulfate is stirred evenly to obtain a 10% sodium sulfate solution. The small water pump 5 is turned on, and the corrosive solution water is added from the supply tank 7 through the injection pipe 10 and the drainage pipe 11 into the holding tank 14. As the water level rises and submerges the heating pipe 16, the process stops when the water level reaches scale 5. The sealing cover 1 on the top of the holding tank 14 is then closed.

[0064] The liquid tank 14 is placed inside the experimental apparatus, and the top of the experimental apparatus is a sealing cover 1. A sensor light 2 is installed on the inner wall of the sealing cover 1. A water filling switch 4 is installed on the liquid supply tank 7.

[0065] When the erosion temperature is set, the heating tube 16 starts working, and the temperature of the solution in the liquid tank 14 continues to rise. The temperature pointer of the temperature-flow rate display 12 rotates clockwise continuously. After reaching the set temperature of 60°C, the heating tube 16 stops heating to maintain a constant temperature, and the pointer stops at the scale corresponding to the set temperature.

[0066] Open the pressure regulating valve 18, and the corrosive solution in the liquid tank 14 begins to flow. The flow rate pointer on the temperature-flow rate display 12 rotates counterclockwise. When the set flow rate is reached, the pointer stops at the corresponding scale when the set solution flow rate is 0.05 m / s. The test block begins to be subjected to the combined effects of temperature, water flow, and corrosive salt. In addition to the above, the concentration of the ion solution in the liquid tank 14 needs to be monitored regularly. The solution in the tank should be replaced every 15 days. When replacing the solution, the waste liquid recovery system should be turned on. The waste liquid enters the waste liquid recovery device 6 for centralized treatment through the injection / drainage port 22 and the drainage pipe 11.

[0067] Every 30 days after erosion, the specimens were removed from the liquid tank 14, wiped dry with a towel, and mechanical property tests were conducted according to GB / T 17671-2021. The surface morphology of the specimens was recorded and the mass was tested. The corrosion resistance coefficient was calculated according to the "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete" (GB / T50082-2024). The erosion period was 150 days, and the results are shown in Table 1. Through the above technical solution, the goal of eroding concrete on one side for 120 days in an environment with a sodium sulfate concentration of 5%, a solution temperature of 60℃, and a flow rate of 0.05m / s was achieved, simulating the real service environment. The erosion data is shown in Table 1. In addition, the same batch of specimens were immersed in a 5% sodium sulfate solution for 120 days, and the erosion data is shown in Table 2. In the temperature-water flow-erosion salt simulation device, the actual service environment of concrete is simulated by the combined effects of temperature field, water flow erosion and ion erosion. Compared with soaking in 5% sodium sulfate solution, the compressive strength decreases faster and the mass loss at the same age is greater, thus achieving the effect of simulating the actual service environment.

[0068] Table 1. Erosion data after 120 days of erosion caused by the combined effects of temperature, water flow, and corrosive salts.

[0069]

[0070] Table 2. Erosion data after 120 days of 5% sodium sulfate erosion.

[0071]

[0072] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A simulation device for the combined erosion of concrete by temperature, water flow, and salt, characterized in that, Includes an erosion device (3), a liquid supply unit, and a display unit; The erosion device (3) is used to simultaneously simulate the unidirectional erosion of concrete specimens in temperature, water flow and salt environments; The liquid supply unit is used to accurately distribute the erosion solution to each erosion device (3) to meet the synchronous liquid supply requirements of multiple units. The display unit is used to display the temperature, flow rate and erosion time parameters in the erosion device (3), and to collect and visualize the working condition data of each test unit in real time, providing an intuitive basis for monitoring the experimental process and adjusting parameters.

2. The device for simulating the co-erosion of concrete by temperature, water flow, and salt according to claim 1, characterized in that, The erosion device (3) includes a heating tube (16), a temperature sensor (17), a pressure regulating valve (18), a liquid tank (14), and a temperature controller (13); The bottom of the liquid tank (14) is hollowed out, the heating tube (16) is located in the center inside the liquid tank (14), the temperature sensor (17) is located at the bottom of the liquid tank (14), and the temperature sensor (17) displays the measured temperature on the temperature-flow rate display (12). The liquid tank (14) is arranged in two rows. Each row of adjacent liquid tanks (14) is connected by a stainless steel pipe. A pressure regulating valve (18) is provided above the pipe to adjust the water flow rate. The liquid tanks (14) at the ends of the two rows are connected by U-shaped connecting pipes (15) to realize the circulation of the solution.

3. The device for simulating the co-erosion of concrete by temperature, water flow, and salt according to claim 2, characterized in that, The top of the liquid tank (14) is a sealing device, and the bottom is engraved with slots and waterproof sleeves (19) for placing erosion specimens at 25cm intervals.

4. The device for simulating the co-erosion of concrete by temperature, water flow, and salt according to claim 2, characterized in that, The heating tube (16) has a heating rate of 20℃ / h and a heating temperature range of 20℃-100℃; the temperature sensor (17) is in contact with the bottom of the liquid tank (14) and is used to detect the temperature of the solution in the liquid tank (14) with high accuracy.

5. The device for simulating the co-erosion of concrete by temperature, water flow, and salt according to claim 3, characterized in that, The slot is divided into two specifications of specimens: a 100×100×100mm cubic specimen slot (20) and a 400×100×100mm prism specimen slot (21); The slot is provided with a liquid injection / drainage port (22).

6. The device for simulating the co-erosion of concrete by temperature, water flow, and salt according to claim 5, characterized in that, A waterproof sleeve (19) is provided on the outside of the slot. The inner diameter of the waterproof sleeve (19) is 0.5-1mm larger than the outer diameter of the specimen. The sleeve tightly wraps the specimen through elastic deformation, forming a sealed structure to effectively prevent solution leakage. Waterproof gaskets are provided on the 100×100×100mm cubic specimen slot (20) and the 400×100×100mm prism specimen slot (21).

7. The device for simulating the co-erosion of concrete by temperature, water flow, and salt according to claim 2, characterized in that, The heating element (16), temperature sensor (13), and pressure regulating valve (18) are connected by wires; The liquid holding tank (14) is made of transparent tempered glass; the waste liquid in the liquid holding tank (14) is transported to the waste liquid placement tank (6) through the liquid injection / drainage port (22) and the liquid drainage pipe (11), and is equipped with a neutralization treatment module.

8. The device for simulating the co-erosion of concrete by temperature, water flow, and salt according to claim 2, characterized in that, The display unit is a temperature-flow rate display (12), located outside the liquid tank (14), which displays the solution temperature and flow rate in the liquid tank (14) in real time for real-time parameter monitoring and feedback adjustment. The erosion device (3) provides erosion solution through a liquid supply unit, which includes a liquid supply tank (7) storing the erosion solution. The liquid supply tank (7) connects the erosion solution to a liquid holding tank (14) through an injection pipe (10). The waste liquid in the liquid holding tank (14) is connected to a drain pipe (11) through an injection / drainage port (22). The output end of the drain pipe (11) is connected to a waste liquid storage tank (6). The waste liquid storage tank (6) is equipped with a neutralization treatment module. A small water pump (5) is installed on the liquid supply tank (7), which provides pressure for the input solution; the waste liquid storage tank (6) is located on the right rear side of the experimental device; A screw-type stirring assembly (8) is installed inside the liquid supply tank (7). The screw-type stirring assembly (8) uniformly stirs the corrosive salt added to the liquid supply tank (7) to make it fully dissolved. A support plate is provided above the injection pipe (10) and the drainage pipe (11), and the support plate is used to support the erosion device (3).

9. A method of using a simulation device for the co-erosion of concrete by temperature, water flow, and salt as described in any one of claims 1-8, characterized in that, Includes the following steps: Place the cube or prism specimen in the slot, prepare the sodium sulfate solution, add the prepared sulfate to the supply tank (7), stir the screw-type stirring assembly (8) to dissolve it evenly in the water, and then transport it to the holding tank (14). The slot is used to fix the cube or prism specimen, so that only the top surface of the specimen is exposed and the other surfaces are limited and fixed by the slot. After the power is turned on, turn on the pumping system switch control panel (9) in the liquid supply tank (7), turn on the small water pump (5), and inject the erosion solution into the liquid tank (14). Set the erosion temperature and flow rate on the temperature-flow rate display (12). Then the heating tube (16) heats the solution temperature and the pressure regulating valve (18) adjusts the solution flow rate between the pipes to achieve the flushing effect. Once the specimen reaches the set corrosion age, remove the specimen, wipe the surface moisture with a towel, and then conduct durability performance tests on the corroded specimen. The heating tube (16) and pressure regulating valve (18) stop working. The pumping system switch control panel (9) is turned on, and the waste liquid in the liquid tank (14) is collected and recycled into the waste liquid storage box (6) through the drain port (22). Then the test piece is taken out for performance testing.

10. The method of using the simulation device for the co-erosion of concrete by temperature, water flow, and salt according to claim 9, characterized in that, The heating tube (16) is temperature controlled by a temperature controller (13). The heating tube (16) operates and heats up. The heating range of the heating tube (16) is 20℃-100℃. The pressure regulating valve (18) is set with flow velocity parameters, simulating a flow velocity range of 0.01m / s-0.1m / s; In the liquid tank (14), the power supply of the device is turned on, and the temperature is set to 20℃-100℃, the simulated flow rate range is 0.01m / s-0.1m / s, and the concentration of corrosive ions can be selected. The liquid tank (14) has a circulating water flow with a set flow rate, and the water only has an erosive effect on one side of the specimen. The temperature sensor (13) is connected to an electronic display (12) which records temperature, flow rate and erosion duration data in real time.

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