Cementitious material deterioration test apparatus and method simulating temperature-wash-corrosion

Abstract

The present application relates to cement-based material deterioration test device and method of simulating temperature-erosion-corrosion. The test device comprises a corrosion chamber, a power assembly, a transmission assembly, a rotary sealing assembly, a test block connecting assembly, a liquid adding assembly and a temperature control assembly; the temperature, water pressure and motor speed are controlled through an external intelligent control system to realize the research on the influence of environmental temperature and different water flow velocities on the deterioration of cement-based materials, and the deterioration law of cement-based materials under the same temperature and flow velocity and the time evolution of the water flow erosion environment. Compared with the prior art, the present application simulates the corrosion environment under the action of different temperatures, different flow velocities and different corrosion media, realizes the precise control of temperature and flow velocity through the regulation of the external intelligent terminal device, simulates the deterioration of cement-based materials under the coupling action of temperature-erosion-corrosion, and can simultaneously carry out indoor erosion test of multiple test blocks, has high automation degree and effectively improves the work efficiency.

Description

Technical Field

[0001] This invention relates to the field of simulation testing technology, and in particular to a device and method for simulating the deterioration of cement-based materials by temperature-erosion-corrosion. Background Technology

[0002] Cement-based infrastructure projects such as bridges, ports, pipelines, and culverts, which are permanently located in marine environments, are susceptible to the effects of varying water flow velocities, including waves, currents, tides, and running water. Under the influence of these currents, cement-based materials are subjected not only to corrosion from corrosive ions but also to the hydraulic forces caused by the scouring action of the water. This coupled effect of scouring and corrosion is a major factor leading to damage and failure of cement-based materials, reduced structural performance, and shortened service life. Furthermore, cement-based infrastructure projects in marine environments are subject to significant temperature differences caused by seasonal variations and diurnal cycles, as well as temperature variations brought about by ocean currents. Temperature changes can significantly increase the diffusion coefficient of corrosive ions, further exacerbating the corrosion of cement-based materials. Therefore, studying the performance degradation mechanism of cement-based materials under the coupled effects of temperature, scouring, and corrosion is of great significance for improving the durability of practical engineering projects.

[0003] Currently, most experimental devices and methods for simulating the degradation of cement-based materials under erosion corrosion employ the ring method and the underwater steel ball method. However, these devices and methods have several shortcomings. For example, they often use agitators to drive water flow, which cannot reasonably control the erosion velocity on the surface of the specimen, making it difficult to accurately characterize the degradation mechanism of cement-based materials under the coupled action of erosion and corrosion. Secondly, cement-based material tests require a large number of specimens for repeated testing, but existing experimental devices cannot simultaneously corrode multiple components when preparing degraded cement-based material specimens, resulting in low specimen preparation efficiency. Furthermore, existing experimental devices often neglect the influence of temperature on the erosion corrosion process of cement-based materials, leading to significant differences from engineering practice.

[0004] Therefore, there is an urgent need to develop a test device and method for simulating the deterioration of cement-based materials by simulating the coupled effects of temperature, erosion, and corrosion. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology by providing a test device and method for simulating temperature-erosion-corrosion degradation of cement-based materials. Through a smart terminal, it can effectively achieve precise control of erosion rate, automatic liquid replenishment and solution temperature, and can simultaneously conduct indoor erosion tests on multiple sets of test blocks, thus improving test accuracy and efficiency.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] This invention provides a test device for simulating temperature-erosion-corrosion degradation of cement-based materials, including a corrosion chamber, a power component, a transmission component, a rotary sealing component, a test block connection component, a liquid addition component, and a temperature control component;

[0008] The corrosion chamber includes a first load-bearing plate, a second load-bearing plate, a baffle, a side plate, and a bottom plate. The first load-bearing plate, the second load-bearing plate, the baffle, the side plate, and the bottom plate are spliced ​​together to form the corrosion chamber cavity. Corrosive liquid is added into the corrosion chamber to achieve the erosion of cement-based materials.

[0009] The transmission assembly includes a rotating rod, gears, and a chain. The gears on two adjacent rotating rods are connected by the chain to ensure that each rotating rod obtains the same rotational speed.

[0010] The power assembly includes a motor, a coupling, and a circular bearing housing, and the power assembly and transmission assembly are used to scour the cement-based material.

[0011] One end of the rotating rod is a threaded end, which extends into the corrosion chamber through a circular bearing seat, and the other end is connected to the motor through a coupling.

[0012] The rotary sealing assembly is installed at the connection between the rotary rod and the second load-bearing plate;

[0013] The test block connecting assembly is screwed to the rotating rod and is located inside the corrosion chamber.

[0014] The liquid filling assembly includes a water tank, a water pump, a liquid filling port, and a liquid outlet. One end of the water pump and the liquid outlet are both connected to the first load-bearing plate.

[0015] The other end of the liquid outlet is connected to the water tank, and the other end of the water pump is connected to one end of the liquid inlet.

[0016] The other end of the liquid inlet is connected to the water tank, and the water tank is connected to the temperature control component through a pipeline;

[0017] The temperature control component regulates the temperature inside the corrosion chamber by using a water bath method.

[0018] Furthermore, the corrosion chamber also includes a partition and a clamp;

[0019] Epoxy resin was applied to the joints of the first load-bearing plate, the second load-bearing plate, the baffle, and the base plate to prevent corrosive water from seeping out from the joints during the test.

[0020] Silicone is provided between the side plate and the first and second load-bearing plates, and is sealed and fixed by the tiger clamp;

[0021] The first and second load-bearing plates are provided with partition grooves, and the partitions pass through the partition grooves and are fixed inside the corrosion chamber.

[0022] The first and second load-bearing plates are welded together from several stainless steel plates, and the baffles, side plates, partitions and bottom plates are all made of PMMA.

[0023] Furthermore, the threaded end of the rotating rod is provided with a flat key groove, which is used to insert the flat key;

[0024] The gear and the rotating rod are connected by a flat key to ensure that the gear and the rotating rod are relatively stationary.

[0025] The threaded end of the rotating rod extends into the corrosion chamber through a circular bearing seat and a rotating rod slot on the second load-bearing plate;

[0026] The power assembly also includes a first microcontroller and a frequency converter;

[0027] The frequency converter is mounted on the motor, and the first microcontroller is connected to the frequency converter.

[0028] The circular bearing housing is fixedly connected to the second load-bearing plate by hexagonal screws and nuts.

[0029] Furthermore, the rotary sealing assembly includes a VA water seal, a water seal cover, and a Glyd ring;

[0030] The glyph ring is inserted from the threaded end of the rotating rod and pressed into the glyph ring groove on the second load-bearing plate, so that the glyph ring and the glyph ring groove are interference fit. The glyph ring is a shaft-mounted rotary glyph ring.

[0031] The VA water seal is inserted from the threaded end of the rotating rod and pressed against the surface of the water seal cover plate, so that the VA water seal and the rotating rod are interference fit;

[0032] The water seal cover is fixed to one side of the circular bearing seat by the second load-bearing plate using hexagonal screws and nuts.

[0033] Furthermore, the test block connection assembly includes a test block, a test block sleeve, and a sleeve connecting rod;

[0034] The test block sleeve is fitted onto both ends of the test block. The test block sleeve has four threaded holes around its perimeter, and four locking screws pass through the threaded holes to fix the test block sleeve to the test block.

[0035] Both sides of the sleeve connecting rod are threaded, and several of the test block sleeves are connected by the sleeve connecting rod;

[0036] The bottom of the test block sleeve is provided with a threaded hole for screwing into the threaded end of the rotating rod.

[0037] Furthermore, the liquid filling assembly also includes a liquid filling port valve, a water pressure sensor, and a liquid outlet valve;

[0038] One end of the liquid outlet is connected to the corrosion chamber through the liquid outlet slot on the first load-bearing plate, and the other end is connected to the water tank. A liquid outlet valve is provided on the end of the liquid outlet near the water tank.

[0039] The water pump is connected to the corrosion chamber through the water pump slot on the first load-bearing plate, and the other end of the liquid filling port is connected to the water tank. The liquid filling port is equipped with a liquid filling port valve.

[0040] The water pressure sensor is installed at the bottom of the corrosion chamber.

[0041] Furthermore, the temperature control component includes an intelligent temperature control system, a temperature control system liquid inlet, a medium outlet, a medium inlet, a temperature sensor, a sleeve, a temperature control system water inlet, and a temperature control system water outlet;

[0042] The liquid inlet of the temperature control system is located on the intelligent temperature control system;

[0043] One end of the medium outlet is connected to the sleeve, and the other end is connected to the water inlet of the temperature control system;

[0044] One end of the medium inlet is connected to the sleeve, and the other end is connected to the outlet of the temperature control system.

[0045] Both the inlet and outlet of the temperature control system are connected to the intelligent temperature control system.

[0046] The sleeve is fitted onto the water tank, and the temperature sensor is located in the corrosion chamber.

[0047] This invention provides a test method for simulating the deterioration of cement-based materials by temperature-erosion-corrosion, comprising the following steps:

[0048] S1: Assemble the test apparatus and fabricate cement-based material test components: Fabricate the required number of test blocks at room temperature, apply epoxy resin to both the upper and lower surfaces of the test blocks, and record the radius r, height H, density ρ, and mass m0 of the test blocks.

[0049] S2: Injecting corrosive medium into the corrosion chamber: After setting the water pressure value through the external intelligent terminal device, the liquid injection component starts working to make the solution in the corrosion chamber reach the set value.

[0050] S3: Temperature loading: After the temperature is set through an external smart terminal device, the temperature control component starts to work, so that the temperature in the corrosion chamber is controlled within the set value of 1℃~70℃.

[0051] S4: Flushing Loading: The inverter is controlled by an external intelligent terminal device to enable the motor to reach a speed n for flushing.

[0052] S5: Based on the rotational speed n in S4, after rinsing for a period of time, remove the test block, wipe off the surface moisture, observe the deterioration of the test block, weigh it, and record its mass as m1. The effective radius of the test block becomes...

[0053] S6: Install the remaining test blocks back into the device, and control the frequency converter through the external intelligent terminal device to control the motor speed to n1=v / 2πr1, so that the remaining test blocks obtain the same scouring speed. Repeat S5-S6 to analyze the degradation law of cement-based materials under water scouring environment over time under the same temperature and flow rate.

[0054] Furthermore, in S2, after the external intelligent terminal device sets the water pressure value, when the water pressure sensor value is less than the set value, the liquid filling valve and water pump are opened to inject the solution into the corrosion chamber.

[0055] When the water pressure sensor reading reaches the set value, the filling port valve and water pump are closed, stopping the injection of solution;

[0056] In S4, the inverter is controlled by a smart terminal to enable the motor to achieve different speeds, and the influence of different water flow velocities on the deterioration of cement-based materials is analyzed.

[0057] Furthermore, in S3, after the external intelligent terminal device sets the temperature value, the intelligent temperature control system introduces a medium solution of the corresponding temperature into the sleeve to adjust the solution temperature in the water tank. Then, the liquid filling valve, the liquid outlet valve, and the water pump are opened to realize the self-circulation of the solution in the water tank and the corrosion chamber.

[0058] When the temperature sensor reading reaches the set value, the temperature control component stops working, and the liquid inlet valve, liquid outlet valve, and water pump are shut off.

[0059] The temperature of the solution in the corrosion chamber was controlled by an external intelligent terminal device to analyze the effect of ambient temperature on the deterioration of cement-based materials.

[0060] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0061] 1. This invention can simulate the corrosive environment under different temperatures, flow rates and corrosive media. Through external intelligent terminal equipment, it can achieve precise control of temperature and flow rate, simulate the deterioration of cement-based materials under the coupled effects of temperature-erosion-corrosion, ensure that the test data obtained in subsequent tests are more accurate and reliable, and has a high degree of automation, thus improving work efficiency.

[0062] 2. This invention can simultaneously conduct indoor simulation tests on multiple test blocks, meeting the requirement of testing a large number of test blocks for cement-based materials, and greatly improving work efficiency.

[0063] 3. This invention employs multiple sealing measures to ensure the sealing performance of the device and the accuracy of the results. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of a test device for simulating the deterioration of cement-based materials under temperature-erosion-corrosion conditions.

[0065] Figure 2 A top view of a test apparatus for simulating the deterioration of cement-based materials under temperature-erosion-corrosion conditions;

[0066] Figure 3 for Figure 1 Schematic diagram of the structure of the second load-bearing plate;

[0067] Figure 4 for Figure 1 Schematic diagram of the structure of the power component;

[0068] Figure 5 for Figure 1 Schematic diagram of the middle transmission assembly;

[0069] Figure 6 for Figure 1 Cross-sectional view of the rotary seal assembly;

[0070] Figure 7 for Figure 1 A schematic diagram of the pilot block connection assembly.

[0071] Figure 1 Explanation of Chinese markings:

[0072] 1-First load-bearing plate, 2-Second load-bearing plate, 3-Baffle, 4-Side plate, 5-Partition, 7-Clamp, 8-Motor, 9-Inverter, 10-First microcontroller, 11-Coupling, 14-Circular bearing seat, 15-Gear, 16-Chain, 24-Water tank, 25-Liquid filling port, 26-Liquid filling port valve, 27-Water pump, 28-Water pressure sensor, 29-Liquid outlet, 30-Liquid outlet valve, 31-Second microcontroller, 32-Intelligent temperature control system, 33-Temperature control system liquid filling port, 34-Media outlet, 35-Media inlet, 37-Sleeve, 38-Temperature control system water inlet, 39-Temperature control system water outlet;

[0073] Figure 2 Explanation of Chinese markings:

[0074] 1-First load-bearing plate, 2-Second load-bearing plate, 4-Side plate, 5-Partition plate, 6-Bottom plate, 7-Hig clamp, 8-Motor, 9-Frequency converter, 10-First microcontroller, 11-Coupling, 14-Circular bearing seat, 16-Chain, 20-Test block, 21-Test block sleeve, 22-Sleeve connecting rod, 24-Water tank, 25-Liquid filling port, 26-Liquid filling port valve, 27-Water pump, 29-Liquid outlet, 30-Liquid outlet valve, 31-Second microcontroller, 32-Intelligent temperature control system, 33-Temperature control system liquid filling port, 34-Media outlet, 36-Temperature sensor, 35-Media inlet, 37-Sleeve, 38-Temperature control system water inlet, 39-Temperature control system water outlet;

[0075] Figure 3 Explanation of the markings in the text:

[0076] 2-Second load-bearing plate;

[0077] Figure 4 Explanation of the markings in the text:

[0078] 2-Second load-bearing plate, 3-baffle, 5-6-base plate, 8-motor, 9-frequency converter, 10-first microcontroller, 11-coupling, 12-rotating rod, 14-circular bearing seat, 16-chain, 20-test block, 21-test block sleeve, 23-stop screw;

[0079] Figure 5 Explanation of the markings in the text:

[0080] 2-Second load-bearing plate, 5-partition plate, 8-motor, 11-coupling, 12-rotating rod, 14-circular bearing seat, 15-gear, 16-chain, 20-test block, 21-test block sleeve;

[0081] Figure 6 Explanation of the markings in the text:

[0082] 2-Second load-bearing plate, 12-Rotating rod, 13-Flat key, 14-Circular bearing seat, 17-VA water seal, 18-Water seal cover plate, 19-Glyd ring;

[0083] Figure 7 Explanation of the markings in the text:

[0084] 20-Test block, 21-Test block sleeve, 22-Sleeve connecting rod, 23-Stop screw. Detailed Implementation

[0085] The following examples illustrate specific implementations of the present invention. These examples are carried out based on the solution described in the present invention, and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following examples.

[0086] The exemplary solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art.

[0087] It should be noted that terms such as "up," "down," "left," and "right," which indicate orientation or positional relationship, are used only to express relative positional relationships for the convenience of describing the present invention, and do not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation; when the absolute position of the object being described changes, the relative positional relationship may also change accordingly. Component models, material names, connection structures, and other features not explicitly stated in this technical solution are all considered common technical features disclosed in the prior art.

[0088] Example 1

[0089] This embodiment provides a test device for simulating the coupled effects of temperature, erosion, and corrosion on cement-based materials, such as... Figure 1 and Figure 2 As shown, it includes a corrosion chamber, a power assembly, a transmission assembly, a rotary sealing assembly, a test block connection assembly, a liquid addition assembly, and a temperature control assembly. Corrosion of the cement-based material is achieved by adding corrosive liquid into the corrosion chamber; the power and transmission assemblies are used to flush the cement-based material; and the temperature control assembly regulates the temperature within the corrosion chamber using a water bath method.

[0090] The corrosion chamber includes a first load-bearing plate 1, a second load-bearing plate 2, a baffle 3, side plates 4, partitions 5, a bottom plate 6, and a clamp 7. For example... Figure 3 As shown, both the first load-bearing plate 1 and the second load-bearing plate 2 are welded from several stainless steel plates, facilitating assembly with other components and bearing the weight of the entire device, ensuring stability during rotation. During the cutting and welding of the first load-bearing plate 1 and the second load-bearing plate 2, slots for the rotating rod 12, Glyd ring, liquid outlet, water pump, and partition are pre-drilled. The first load-bearing plate 1, the second load-bearing plate 2, the baffle 3, and the base plate 6 are joined to form the corrosion chamber. A layer of epoxy resin is applied to each joint to prevent water from seeping out during the test. The solution in the corrosion chamber can be replaced according to different experimental research backgrounds, such as seawater, tap water, or corrosive salt solutions. A layer of silicone is placed between the sides of the first load-bearing plate 1 and the second load-bearing plate 2 and the side plate 4, and the connection is secured with clamps 7. The spacing of the clamps 7 can be referenced in the "Technical Specification for Installation of Flange Sealing Structures" CSEIJX 0004-2018. The partition 5 passes through the grooves reserved in the first load-bearing plate 1 and the second load-bearing plate 2 to prevent the water flow from affecting each other during the test.

[0091] The first load-bearing plate 1, the second load-bearing plate 2, the rotating rod 12, and the test block connecting assembly are all made of stainless steel, which has the characteristics of corrosion resistance and high strength; the baffle 3, the side plate 4, the partition 5, and the bottom plate 6 are all made of PMMA, which has the characteristics of corrosion resistance, low price, and easy observation.

[0092] like Figure 4 As shown, the power assembly includes a motor 8, a frequency converter 9, a first microcontroller 10, a coupling 11, and a circular bearing housing 14. The frequency converter 9 is mounted on the motor 8, and the first microcontroller 10 is connected to the frequency converter 9. The circular bearing housing 14 is fixedly connected to the second load-bearing plate 2 by four hexagonal screws and nuts. The frequency converter 9 can be adjusted via an external intelligent terminal device to make the motor 8 rotate at different speeds, allowing for the study of the degradation behavior of cement-based materials under different water flow velocities.

[0093] The transmission assembly includes a gear 15, a chain 16, and a rotating rod 12, such as Figure 5 As shown, gear 15 and rotating rod 12 are connected by a flat key 13, keeping them relatively stationary and ensuring transmission stability. Chain 16 connects the gears 15 on adjacent rotating rods 12, ensuring each rotating rod 12 achieves the same rotational speed. Gears 15 should be of the same size and specifications, and the distance between rotating rods 12 should be the same to ensure that each shaft rotates at the same speed. One end of rotating rod 12 is threaded, extending into the corrosion chamber through a slot in the circular bearing seat 14 and the second load-bearing plate 2; the other end is connected to motor 8 via coupling 11. The second load-bearing plate 2 and circular bearing seat 14 are fixedly connected by four sets of hexagonal screws and nuts. A slot in the rotating rod 12 is provided for inserting a flat key 13. Frequency converter 9 connects to motor 8, and the first microcontroller 10 connects to frequency converter 9. Motor 8 should be installed in a stable location and fixed to avoid excessive vibration.

[0094] The rotary seal assembly includes a VA water seal 17, a water seal cover 18, and a Glyd ring 19. For example... Figure 6 As shown, the Glyd ring 19 is inserted into the groove of the second bearing plate 2 from the threaded end of the rotating rod 12 and pressed into the groove of the Glyd ring 19, with an interference fit. The Glyd ring 19 is a shaft-mounted rotary Glyd ring 19, which is corrosion-resistant and can withstand pressure from both sides. It is installed in the groove of the second bearing plate 2, and the groove conforms to the ISO-7425 standard. The water seal cover plate 18 is fixedly connected to the second bearing plate 2 on the other side of the circular bearing seat 14 by four sets of internal hexagonal screws and nuts. The VA water seal 17 is inserted into the surface of the water seal cover plate 18 from the threaded end of the rotating rod 12 and pressed into the surface of the water seal cover plate 18, with an interference fit.

[0095] Figure 7 This is a schematic diagram of the test block connection assembly, as shown below. Figure 7As shown, the test block connection assembly includes a test block 20, a test block sleeve 21, and a sleeve connecting rod 22. The upper and lower surfaces of the test block 20 are coated with epoxy resin to prevent the solution from eroding the cement-based material from the upper and lower surfaces of the test block 20. The test block sleeve 21 is fitted onto both sides of the test block 20, and the test block sleeve 21 has four threaded holes around its circumference. Four locking screws 23 pass through these threaded holes and are fixedly connected to the test block 20. The sleeve connecting rod 22 has threads on both sides, and several test block sleeves 21 are connected by the sleeve connecting rod 22. The bottom of the test block sleeve 21 has a threaded hole for screwing into the threaded end of the rotating rod 12. When assembling all parts coaxially, it is necessary to ensure that all parts are coaxial. The test block sleeve 21 can be replaced with different sizes to study the size effect of cement-based materials. In addition, the dimensions of the side plate 4, partition plate 5 and bottom plate 6 can be adjusted according to the number of test blocks 20 required for the test, and the first load-bearing plate 1 and the second load-bearing plate 2 can be customized by determining the number of rotating rods 12 to meet the test requirements for the number of test blocks 20.

[0096] The liquid filling assembly includes a water tank 24, a filling port 25, a filling port 25 valve, a water pump 27, a water pressure sensor 28, a liquid outlet 29, a liquid outlet 29 valve, and a second microcontroller 31. One end of the liquid outlet 29 is connected to the corrosion chamber through a slot on the first load-bearing plate 1, and the other end is connected to the water tank 24. A liquid outlet 29 valve is provided on the end of the liquid outlet 29 closest to the water tank 24. One end of the water pump 27 is connected to the corrosion chamber through a slot on the first load-bearing plate 1, and the other end is connected to one end of the filling port 25. The other end of the filling port 25 is connected to the water tank 24, and a filling port valve 26 is provided on the filling port 25. The water pressure sensor 28 is installed at the bottom of the corrosion chamber.

[0097] The temperature control assembly includes an intelligent temperature control system 32, a temperature control system inlet 33, a medium outlet 34, a medium inlet 35, a temperature sensor 36, a sleeve 37, a temperature control system water inlet 38, and a temperature control system water outlet 39. The sleeve 37 is fitted over the water tank 24. The medium solution is added through the temperature control system inlet 33, which is located on the intelligent temperature control system 32. One end of the medium outlet 34 is connected to the sleeve 37, and the other end is connected to the temperature control system water inlet 38. One end of the medium inlet 35 is connected to the sleeve 37, and the other end is connected to the temperature control system water outlet 39. Both the temperature control system water inlet 38 and the temperature control system water outlet 39 are connected to the intelligent temperature control system 32. The sleeve 37 is fitted over the water tank 24, and the temperature sensor 36 is located in the corrosion chamber.

[0098] This embodiment also provides a test method for simulating the degradation of cement-based materials under the coupled effects of temperature-erosion-corrosion, including the following steps:

[0099] S1: Fabricate test components for cement-based materials. Following standard operating procedures, fabricate the required number of test blocks 20 at room temperature, and coat the upper and lower surfaces of the test blocks 20 with epoxy resin to prevent the solution from eroding the cement-based material from its surfaces.

[0100] S2: Assemble the corrosion chamber. Join the first load-bearing plate 1, the second load-bearing plate 2, and the baffle 3, and apply a layer of epoxy resin to the joints. Place a layer of silicone sealant between the sides of the first load-bearing plate 1 and the second load-bearing plate 2 and the side plate 4, and secure them together with clamps 7. Apply a layer of epoxy resin between the bottom surfaces of the first load-bearing plate 1 and the second load-bearing plate 2 and the bottom plate 6 to prevent water from seeping out of the joints during the test. The partition 5 passes through the pre-drilled grooves on the first load-bearing plate 1 and the second load-bearing plate 2 to prevent mutual interference of water flow during the test.

[0101] S3: Install the transmission components. The second load-bearing plate 2 is sealed and fixedly connected to each of the circular bearing seats 14 by four sets of hexagonal screws and nuts. A flat key 13 is inserted into the slots of each rotating rod 12, and the threaded end of the rotating rod 12 extends into the corrosion chamber through the circular bearing seats 14 and the slots of the rotating rod 12 on the second load-bearing plate 2. Gears 15 are assembled with the rotating rods 12 via the flat key 13, keeping the gears 15 and rotating rods 12 relatively stationary to ensure transmission stability. A chain 16 connects the gears 15 on two adjacent rotating rods 12, ensuring that each rotating rod 12 achieves the same rotational speed.

[0102] S4: Assemble the rotary seal assembly. A Glyd ring 19 is fitted onto the threaded end of the rotating rod 12 and pressed into the groove of the Glyd ring 19 on the second load-bearing plate 2, with an interference fit. The water seal cover plate 18 is sealed and fixed to the second load-bearing plate 2 on the other side of the circular bearing housing 14 by four sets of internal hexagonal screws and nuts. The VA water seal 17 is fitted onto the threaded end of the rotating rod 12 and pressed into the water seal cover plate 18, with an interference fit. This forms two rotary water seals to prevent corrosion from water seepage during the test.

[0103] S5: Install the test block connecting assembly. The bottom of the test block sleeve 21 has a threaded hole, into which the threaded end of the rotating rod 12 is screwed; the test block sleeve 21 is fitted on both sides of the test block 20 and fixed with four locking screws 23 respectively; the sleeves 37 are connected to each other by the sleeve connecting rod 22. When assembling coaxial parts, it is necessary to ensure that all parts are coaxial.

[0104] S6: Assemble the power components. The frequency converter 9 connects to the motor 8, and the first microcontroller 10 connects to the frequency converter 9. The motor 8 should be installed in a stable location and fixed in place to avoid excessive vibration.

[0105] S7: Assemble the liquid filling assembly. One end of the liquid outlet 29 is connected to the corrosion chamber through a slot on the first load-bearing plate 1, and the other end is connected to the water tank 24. A liquid outlet valve 30 is provided on the end of the liquid outlet 29 near the water tank 24. One end of the water pump 27 is connected to the corrosion chamber through a slot on the first load-bearing plate 1, and the other end is connected to one end of the liquid filling port 25. The other end of the liquid filling port 25 is connected to the water tank 24. A liquid filling valve 26 is provided on the liquid filling port 25. A water pressure sensor 28 is installed at the bottom of the corrosion chamber.

[0106] S8: Assemble the temperature control components. A sleeve 37 is fitted over the outside of the water tank 24. The medium solution is added through the inlet 25. One end of the medium outlet 34 is connected to the sleeve 37, and the other end is connected to the temperature control system inlet 38. One end of the medium inlet 35 is connected to the sleeve 37, and the other end is connected to the temperature control system outlet 39. Both the temperature control system inlet 38 and the temperature control system outlet 39 are connected to the intelligent temperature control system 32.

[0107] S9: Record the radius r, height H, density ρ, and mass m0 of the test block 20.

[0108] S10: Corrosive medium is injected into the corrosion chamber. After the water pressure value is set via an external intelligent terminal device, the liquid injection assembly starts working to bring the solution in the corrosion chamber to the set value. After the water pressure value is set via the external intelligent terminal device, when the value of the water pressure sensor 28 is less than the set value, the liquid injection valve 26 and the water pump 27 open to inject solution into the corrosion chamber; when the value of the water pressure sensor 28 reaches the set value, the liquid injection valve 26 and the water pump 27 close to stop injecting solution. Furthermore, if the water pressure drops due to solution loss in the corrosion chamber during the experiment, the liquid injection assembly automatically repeats the above operation.

[0109] S11: Temperature Loading. After the temperature is set via an external intelligent terminal device, the temperature control component starts working, maintaining the temperature inside the corrosion chamber within the set value of 1℃ to 70℃. The temperature control system uses the principle of water bath heating. Specifically, after the temperature value is set via the external intelligent terminal device, the intelligent temperature control system 32 introduces the corresponding temperature medium solution into the sleeve 37 to adjust the solution temperature in the water tank 24; it opens the inlet valve 26, the outlet valve 30, and the water pump 27 to achieve self-circulation of the solution between the water tank 24 and the corrosion chamber, thereby achieving the purpose of regulating the solution temperature in the corrosion chamber. When the temperature sensor 36 reaches the set value, the temperature control component stops working, and the inlet valve 26, the outlet valve 30, and the water pump 27 are closed. Furthermore, when the temperature sensor 36 changes during the experiment, the temperature control component automatically repeats the above operations. The intelligent temperature control system 32 can achieve a temperature range of 1℃~70℃, and the temperature control mode is to control the outlet medium temperature. The temperature control accuracy is ±0.5℃ of the controlled medium temperature. During operation, the intelligent temperature control system 32 will not cause the pressure to rise due to high temperature, and will automatically replenish the heat transfer medium when the temperature is low.

[0110] S12: Scouring Loading. The inverter 9 is controlled by an external intelligent terminal device to make the motor 8 obtain a certain speed n. At this time, the angular velocity of the test block 20 is w = 2πn, and the scouring speed can be expressed as v = wr. At this time, the torque of the circumferential side wall of the test block 20 is the same, and the water flow shear stress on the surface of the test block 20 is also the same.

[0111] S13: After rinsing at a certain rotational speed n for a period of time, remove the test block 20, wipe off the surface moisture, observe and analyze the component's deterioration, and weigh it, recording it as m1. Then its effective radius becomes...

[0112] S14: Reinstall the remaining test block 20 back into the device. Control the frequency converter 9 through the external intelligent terminal device, and then control the speed of the motor 8 to n1 = v / 2πr1, so that the test block 20 obtains the same scouring speed. Repeat S13 and S14 to analyze the degradation law of cement-based materials under water scouring environment over time at the same temperature and flow rate.

[0113] Furthermore, by controlling the frequency converter 9 through an external intelligent terminal device to enable the motor 8 to achieve different speeds, the influence of different water flow velocities on the deterioration of cement-based materials can be analyzed; by controlling the temperature of the corrosion chamber solution through an external intelligent terminal device, the influence of ambient temperature on the deterioration of cement-based materials can be analyzed.

[0114] The experimental principle of this apparatus is as follows: the corrosion chamber is separated by a partition 5, allowing each rotating rod 12 to operate independently and preventing interference between water flows. The power unit can remotely adjust the frequency converter 9 via an external intelligent terminal device, enabling the motor 8 to move at different speeds. The transmission assembly is located on one side of the corrosion chamber and is connected to the main power shaft via a chain 16 and gear 15, ensuring that all shafts move at the same speed. The rotary sealing assembly prevents the solution in the corrosion chamber from seeping through the rotating shaft. The test block connection assembly connects the rotating rod 12 to the test block, and between test blocks themselves. The temperature control assembly, via an intelligent terminal, maintains the temperature of the corrosive medium in the corrosion chamber between 1℃ and 70℃. The liquid addition assembly enables intelligent liquid addition and dispensing, while maintaining a constant water pressure in the corrosion chamber during the process.

[0115] This invention overcomes the shortcomings of existing hydraulic cement-based material erosion resistance testing technology, and can simultaneously conduct indoor simulation tests on multiple sets of test blocks to meet the needs of a large number of cement-based material test blocks; moreover, it can realize real-time monitoring and stable control of temperature, erosion intensity and corrosive liquid water pressure through remote terminal, and study the effects of ambient temperature and different water flow velocities on the deterioration of cement-based materials, as well as the time-varying deterioration mechanism of cement-based materials under the same temperature and flow velocity in a water flow erosion environment.

[0116] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A test apparatus for simulating temperature-erosion-corrosion degradation of cement-based materials, characterized in that, It includes a corrosion chamber, a power assembly, a transmission assembly, a rotary seal assembly, a test block connection assembly, a liquid addition assembly, and a temperature control assembly; The corrosion chamber includes a first load-bearing plate (1), a second load-bearing plate (2), a baffle (3), a side plate (4), and a bottom plate (6). The first load-bearing plate (1), the second load-bearing plate (2), the baffle (3), the side plate (4), and the bottom plate (6) are spliced ​​together to form a corrosion chamber cavity. Corrosive liquid is added into the corrosion chamber to achieve the erosion of cement-based materials. The transmission assembly includes a rotating rod (12), a gear (15) and a chain (16). The gears (15) on two adjacent rotating rods (12) are connected by the chain (16) to ensure that each rotating rod (12) obtains the same rotation speed. The power assembly includes a motor (8), a coupling (11), and a circular bearing housing (14), and the power assembly and transmission assembly are used to scour the cement-based material; One end of the rotating rod (12) is a threaded end, which extends into the corrosion chamber through a circular bearing seat (14), and the other end is connected to the motor (8) through a coupling (11); The rotary sealing assembly is installed at the connection between the rotary rod (12) and the second load-bearing plate (2); The test block connecting assembly is screwed to the rotating rod (12) and is located inside the corrosion chamber. The liquid filling assembly includes a water tank (24), a water pump (27), a liquid filling port (25), and a liquid outlet (29). One end of the water pump (27) and the liquid outlet (29) are both connected to the first load-bearing plate (1). The other end of the outlet (29) is connected to the water tank (24), and the other end of the water pump (27) is connected to one end of the filling port (25); The other end of the liquid inlet (25) is connected to the water tank (24), and the water tank (24) is connected to the temperature control component through a pipeline; The temperature control component regulates the temperature inside the corrosion chamber by using a water bath method.

2. The test apparatus for simulating temperature-erosion-corrosion degradation of cement-based materials according to claim 1, characterized in that, The corrosion chamber also includes a partition (5) and a tiger clamp (7); Epoxy resin is applied to the joints of the first load-bearing plate (1), the second load-bearing plate (2), the baffle (3) and the base plate (6) to prevent corrosive water from seeping out from the joints during the test. Silicone is provided between the side plate (4) and the first load-bearing plate (1) and the second load-bearing plate (2), and is sealed and fixed by the tiger clamp (7); The first load-bearing plate (1) and the second load-bearing plate (2) are provided with partition grooves, and the partition (5) passes through the partition grooves and is fixed inside the corrosion chamber. The first load-bearing plate (1) and the second load-bearing plate (2) are welded together from several stainless steel plates. The baffle (3), side plate (4), partition (5) and bottom plate (6) are all made of PMMA.

3. The test apparatus for simulating temperature-erosion-corrosion degradation of cement-based materials according to claim 1, characterized in that, The threaded end of the rotating rod (12) is provided with a flat key groove, which is used to insert the flat key (13); The gear (15) and the rotating rod (12) are connected by a flat key (13) to ensure that the gear (15) and the rotating rod (12) are relatively stationary; The threaded end of the rotating rod (12) extends into the corrosion chamber through the circular bearing seat (14) and the slot of the rotating rod (12) on the second load-bearing plate (2); The power assembly also includes a first microcontroller (10) and a frequency converter (9); The frequency converter (9) is mounted on the motor (8), and the first microcontroller (10) is connected to the frequency converter (9); The circular bearing seat (14) is fixedly connected to the second load-bearing plate (2) by hexagonal screws and nuts.

4. The test apparatus for simulating temperature-erosion-corrosion degradation of cement-based materials according to claim 1, characterized in that, The rotary sealing assembly includes a VA water seal (17), a water seal cover (18), and a Gladley ring (19); The glyph (19) is inserted from the threaded end of the rotating rod (12) and pressed into the glyph groove on the second load-bearing plate (2) so that the glyph (19) and the glyph groove are interference fit. The glyph (19) is a shaft-mounted rotary glyph. The VA water seal (17) is inserted from the threaded end of the rotating rod (12) and pressed against the surface of the water seal cover plate (18), so that the VA water seal (17) and the rotating rod (12) are interference fit; The water seal cover (18) is fixed to one side of the circular bearing seat (14) by the second load-bearing plate (2) with hexagonal screws and nuts.

5. The test apparatus for simulating temperature-erosion-corrosion degradation of cement-based materials according to claim 1, characterized in that, The test block connection assembly includes a test block (20), a test block sleeve (21), and a sleeve connecting rod (22); The test block sleeve (21) is fitted onto both ends of the test block (20). The test block sleeve (21) has four threaded holes around its perimeter. Four locking screws (23) pass through the threaded holes to fix the test block sleeve (21) and the test block (20) in place. Both sides of the sleeve connecting rod (22) are threaded, and several test block sleeves (21) are connected to each other through the sleeve connecting rod (22); The bottom of the test block sleeve (21) is provided with a threaded hole for screwing into the threaded end of the rotating rod (12).

6. The test apparatus for simulating temperature-erosion-corrosion degradation of cement-based materials according to claim 1, characterized in that, The liquid filling assembly also includes a liquid filling port valve (26), a water pressure sensor (28), and a liquid outlet valve (30); One end of the outlet (29) is connected to the corrosion chamber through the outlet slot on the first load-bearing plate (1), and the other end is connected to the water tank (24). An outlet (29) valve is provided on the end of the outlet (29) near the water tank (24). The water pump (27) is connected to the corrosion chamber through the water pump slot on the first load-bearing plate (1), and the other end of the liquid filling port (25) is connected to the water tank (24). The liquid filling port (25) is provided with a liquid filling port valve (26). The water pressure sensor (28) is installed at the bottom of the corrosion chamber.

7. The test apparatus for simulating temperature-erosion-corrosion degradation of cement-based materials according to claim 1, characterized in that, The temperature control component includes an intelligent temperature control system (32), a temperature control system liquid inlet (33), a medium outlet (34), a medium inlet (35), a temperature sensor (36), a sleeve (37), a temperature control system water inlet (38), and a temperature control system water outlet (39); The liquid inlet (33) of the temperature control system is located on the intelligent temperature control system (32); One end of the medium outlet (34) is connected to the sleeve (37), and the other end is connected to the water inlet (38) of the temperature control system; One end of the medium inlet (35) is connected to the sleeve (37), and the other end is connected to the outlet (39) of the temperature control system; The inlet (38) and outlet (39) of the temperature control system are both connected to the intelligent temperature control system (32); The sleeve (37) is fitted onto the water tank (24), and the temperature sensor (36) is located in the corrosion chamber.

8. A test method for a simulated temperature-erosion-corrosion test apparatus for cement-based material deterioration as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Assemble the test apparatus and make cement-based material test components: Make the required number of test blocks (20) at room temperature, apply epoxy resin to the upper and lower surfaces of the test blocks (20), and record the radius r, height H, density ρ and mass m0 of the test blocks (20); S2: Injecting corrosive medium into the corrosion chamber: After setting the water pressure value through the external intelligent terminal device, the liquid injection component starts working to make the solution in the corrosion chamber reach the set value. S3: Temperature loading: After the temperature is set through an external smart terminal device, the temperature control component starts to work, so that the temperature in the corrosion chamber is controlled within the set value of 1℃~70℃. S4: Flushing loading: The inverter (9) is controlled by an external intelligent terminal device to make the motor (8) obtain a speed n and perform flushing; S5: Based on the rotational speed n in S4, after rinsing for a period of time, remove the test block (20), wipe off the surface moisture, observe the deterioration of the test block (20), weigh its mass and record it as m1. The effective radius of the test block (20) becomes S6: Install the remaining test blocks (20) back into the device, and control the inverter (9) through the external intelligent terminal device to control the speed of the motor (8) to n1=v / 2πr1, so that the remaining test blocks (20) can obtain the same scouring speed. Repeat S5-S6 to analyze the degradation law of cement-based materials under the water scouring environment at the same temperature and flow rate.

9. The test method for simulating temperature-erosion-corrosion degradation of cement-based materials according to claim 8, characterized in that, In S2, after the external intelligent terminal device sets the water pressure value, when the value of the water pressure sensor (28) is less than the set value, the liquid filling valve (26) and the water pump (27) are opened to inject the solution into the corrosion chamber. When the value of the water pressure sensor (28) reaches the set value, the liquid inlet valve (26) and the water pump (27) are closed, and the injection of solution is stopped; In S4, the inverter (9) is controlled by the intelligent terminal to enable the motor (8) to obtain different speeds, and the influence of different water flow velocities on the deterioration of cement-based materials is analyzed.

10. The test method for simulating temperature-erosion-corrosion degradation of cement-based materials according to claim 8, characterized in that, In S3, after the external intelligent terminal device sets the temperature value, the intelligent temperature control system (32) introduces the medium solution of the corresponding temperature into the sleeve (37) to adjust the solution temperature in the water tank (24). Then, the liquid filling valve (26), the liquid outlet valve (30) and the water pump (27) are opened to realize the self-circulation of the solution in the water tank (24) and the corrosion chamber. When the temperature sensor (36) reaches the set value, the temperature control component stops working, and the liquid inlet (25) valve, the liquid outlet (29) valve and the water pump (27) are closed; The temperature of the solution in the corrosion chamber was controlled by an external intelligent terminal device to analyze the effect of ambient temperature on the deterioration of cement-based materials.

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