A method and apparatus for collecting a slow expansion force test

Abstract

The application discloses a kind of slow expansion force acquisition test methods, and the expansion body material is loaded into thin-walled metal tank and injected into absorption medium, and then amorphous thin-walled metal tank is placed in liquid medium, the mechanical force generated by expansion of expansion body material is transmitted to liquid medium through amorphous thin-walled metal tank, and is converted into hydraulic pressure to be measured, and slow expansion force data is obtained.The application adopts innovative process method, pressure vessel is stressed evenly, data acquisition is accurate and reliable, test is continuous, operation is simple, and is widely used.In the premise of ensuring low cost, energy saving and environmental protection, the volume expansion rate corresponding to the expansion pressure of various slow expansion materials under different media and different temperatures can be tested, and practical data support is provided for slow expansion materials in engineering application.

Description

Technical Field

[0001] This invention relates to the field of expansion testing, and more particularly to a method and apparatus for collecting and testing slow expansion force. Background Technology

[0002] Slow-expansion specialty materials are commonly used in engineering applications, such as polyurethane grouting materials, water-swellable rubber waterstops, and oil-swellable rubber. These materials play a crucial role in seepage prevention, leak sealing, and plugging in various structures across industries such as transportation, municipal engineering, construction, electronics, and machinery. Their mechanism of action involves utilizing the property of these materials to expand again upon contact with water or oil after solidification, tightening gaps and contact points between components to achieve seepage prevention and sealing. In structures such as dams and tunnels, seepage and leakage through concrete expansion joints, cracks, and construction joints are very common due to improper construction or operation and maintenance. These materials are typically used for subsequent treatment, achieving good results and being widely applied in numerous projects.

[0003] In engineering applications, it is desirable to achieve the desired treatment effect through expansion, but it is also undesirable for excessive expansion force to cause secondary defects in expansion joints, cracks, and components. Therefore, the testing of expansion force has become a focus of attention for designers and construction personnel. Currently, the volume expansion rate of such slow-expanding materials after absorbing the medium is relatively easy to test. However, since the expanding material expands 360 degrees, the magnitude of the expansion force corresponding to the volume expansion rate cannot be measured by existing testing equipment. Due to the lack of actual data support, we can only judge whether it will affect the application area and the project based on past engineering experience. This is especially true for certain precision projects or components with high requirements for the safety range of expansion force, which will be a huge uncertainty factor. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method and apparatus for collecting and testing the expansion force of slow-expansion materials. This method and apparatus can test the expansion force data of various slow-expansion materials in a short period of time and at low cost, and provide a data table that matches the volume expansion rate, thus providing data support for engineering applications.

[0005] The objective of this invention is achieved through the following technical solution: a method for collecting and testing the slow expansion force, wherein the slow expansion material is loaded into an amorphous thin-walled metal can and an absorbent medium is injected into the slow expansion material. The amorphous thin-walled metal can is then placed in a container filled with a liquid medium. During the absorption of the medium, the slow expansion material undergoes volume expansion. The mechanical force generated by the expansion is transmitted to the liquid medium through the amorphous thin-walled metal can and converted into hydraulic pressure for measurement, thereby obtaining the slow expansion force data.

[0006] Furthermore, the volume change of the amorphous thin-walled metal can during expansion and the expansion force absorbed by the slowly expanding body can be ignored.

[0007] Furthermore, the material of the thin-walled metal can is a thin-walled metal can made of copper-based non-magnetic amorphous alloy or iron-based amorphous alloy. The mass ratio of Cu, Fe and Ti metal elements in the material is 64:22.5:13.5 respectively. The material has an amorphous / nanocrystalline composite structure, wherein the amorphous component is 60-80%, the nanocrystalline component is 40-20%, and the thickness of the can wall sheet is 0.1-0.15 mm.

[0008] Furthermore, after the slow-expansion material is loaded into an amorphous thin-walled metal can, the gas inside the thin-walled metal can is vented using a liquid medium pressure difference venting method.

[0009] Furthermore, a first check valve and a second check valve are installed at the opening of the amorphous thin-walled metal tank. After the amorphous thin-walled metal tank is filled with medium, the first check valve and the second check valve are opened, and the medium is continued to be filled through the second check valve port. When the medium overflows from the first check valve port due to the pressure difference, the first check valve is closed, and filling continues. After there is no change in the liquid level, the second check valve is closed, and the amorphous thin-walled metal tank is emptied.

[0010] Furthermore, the injected absorbent medium is 1 to 1.5 times greater than the maximum absorbance of the slow-expanding material.

[0011] Furthermore, the slow-expansion material is a polyurethane grouting material with a maximum expansion rate of 23.4~40.5, and the testing cycle is 12~23 days.

[0012] Furthermore, an amorphous thin-walled metal can is placed inside a pressure testing tank filled with liquid medium. Two electronic automatic pressure gauges are installed on the upper part of the pressure testing tank opening to collect liquid pressure data. The pressure testing tank adopts a hollow jacket double-layer structure and is equipped with an inlet and an outlet, which can accurately control the temperature of the entire medium inside the sphere according to the testing requirements.

[0013] Furthermore, the average value of the hydraulic pressure data collected by all electronic automatic pressure acquisition gauges at the same time point is calculated, and the growth curves of the slow expansion force are plotted according to the relationship between time and slow expansion force, and the peak data of the slow expansion force are processed and calculated.

[0014] On the other hand, the present invention also provides a device for collecting and testing the slow expansion force, the device comprising:

[0015] Amorphous thin-walled metal cans are used to contain slow-expansion materials and their absorption media.

[0016] Pressure testing vessel, used to hold an amorphous thin-walled metal can and fill it with a liquid medium, the liquid medium being a combination of dimethyl silicone oil and phosphate ester hydraulic oil, with a volume ratio of 30-40:70-60.

[0017] Two electronic automatic pressure acquisition gauges are installed on the upper part of the pressure test tank opening to collect the liquid pressure data inside the pressure test tank;

[0018] The receiving terminal is used to acquire data from the electronic automatic pressure acquisition meter, perform variance correction on the data at the same time point, plot the growth curve of the slow expansion force based on the relationship between time and slow expansion force, and process and calculate the peak data of the slow expansion force.

[0019] The beneficial effects of this invention are as follows: This invention employs an innovative process method, resulting in uniform stress distribution on the pressure vessel, accurate and reliable data acquisition, continuous testing, simple operation, and strong versatility. While ensuring low cost and energy conservation, it can test the expansion pressure of various slow-expansion materials under different media and temperatures, providing practical data support for the engineering applications of slow-expansion materials. The use of an amorphous thin-walled metal tank as the container for the slow-expansion solidified body converts the mechanical force of expansion into hydraulic pressure, reducing the impact of tank constraints on the expansion force. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the slow expansion force acquisition and testing device of the present invention.

[0022] Figure 2 This is a schematic diagram of the amorphous thin-walled metal can of the present invention.

[0023] Figure 3 This is a schematic diagram illustrating the process of removing internal air from the amorphous thin-walled metal can of the present invention.

[0024] Figure 4 This is a schematic diagram of the pressure testing vessel of the present invention.

[0025] Figure 5 This is a schematic diagram of the verification test device of the present invention.

[0026] Figure 6 This is a schematic diagram illustrating the convergence trend of the experimental results in Embodiment 1 of the present invention.

[0027] Figure 7This is a schematic diagram of the convergence trend of the experimental results in Embodiment 2 of the present invention.

[0028] Figure 8 This is a schematic diagram illustrating the convergence trend of the experimental results in Embodiment 3 of the present invention.

[0029] Figure 9 This is a schematic diagram of the convergence trend of the experimental results in Embodiment 4 of the present invention.

[0030] Figure 10 This is a schematic diagram illustrating the convergence trend of the experimental results in Embodiment 5 of the present invention.

[0031] Figure 11 This is a schematic diagram illustrating the convergence trend of the experimental results in Embodiment Six of the present invention.

[0032] Figure 12 This is a comparison chart showing the difference in pressure gauge values ​​between the external pressure source and pressure tanks P1 and P2 in Embodiment 7 of the present invention. Detailed Implementation

[0033] In order to clearly express the purpose, solution and technical advantages of the embodiments of the present invention, the device and technical solution are clearly and completely described in the embodiments in conjunction with the accompanying drawings. The described embodiments are some embodiments of the present invention, not all embodiments.

[0034] like Figure 1 As shown, the present invention provides a device for collecting and testing the slow expansion force, the device comprising:

[0035] An amorphous thin-walled metal can 1 is used to contain a pre-prepared, non-absorbent medium-expanding material and an absorbent medium for the material. In this invention, the expansion medium is selected from polyurethane grouting material with a maximum expansion rate of 23.4~40.5. The thin-walled metal can is made of an amorphous alloy material, which has a small volume change during expansion, and the expansion force absorbed by the expansion medium is negligible. The amorphous alloy material is a thin-walled metal can made of copper-based non-magnetic amorphous alloy or iron-based amorphous alloy. The mass ratio of Cu, Fe and Ti metal elements in the material is 64:22.5:13.5 respectively. The material has an amorphous / nanocrystalline composite structure, wherein the amorphous component is 60-80%, the nanocrystalline component is 40-20%, and the thickness of the can wall sheet is 0.1-0.15 mm.

[0036] Pressure test tank 2, such as Figure 4 As shown, an amorphous thin-walled metal can 1 is placed and filled with constant-temperature liquid 7 to achieve a constant-temperature water bath. The can opening is tightened with three fastening bolts 5. The can cover has a safety pressure relief valve 6, and the can body is equipped with an exhaust and hydraulic medium inlet 8. The pipeline has a valve 9.

[0037] The electronic automatic pressure acquisition gauge has two installed at the opening of the pressure test tank, including pressure gauge P1 (3) and pressure gauge P2 (4), which are used to collect the liquid pressure data inside the pressure test tank.

[0038] The receiving terminal, which is a computer in this invention, is used to acquire data from an electronic automatic pressure acquisition meter, perform variance correction on the data at the same time point, plot the growth curve of the slow expansion force based on the relationship between time and slow expansion force, and process and calculate the peak data of the slow expansion force.

[0039] This invention also provides a method for collecting and testing the slow expansion force. In this embodiment, the absorbent medium of the slow expansion body material is water, and the liquid medium injected into the pressure test tank is a combination of dimethyl silicone oil and phosphate ester hydraulic oil. The amorphous thin-walled metal tank is made of an amorphous metal alloy. When the amorphous thin-walled metal tank expands, the volume change is minimal, and the expansion force absorbed by the slow expansion body is negligible. There is no reaction between the slow expansion body material, the medium, and the amorphous thin-walled metal tank. The specific implementation steps are as follows:

[0040] 1. Calibration of the maximum water absorption of the slow-expansion material: Place the slow-expansion material and water at 20-25 degrees Celsius for 24 hours. Weigh the initial mass of the slow-expansion material and measure its initial volume. Add water quantitatively to the container holding the slow-expansion material. Measure the mass and volume of the slow-expansion material periodically. Repeat this quantitative addition of water until the volume of the slow-expansion material stabilizes and stops expanding. The amount of water absorbed at this point is the maximum water absorption, which is also the maximum expansion volume of the slow-expansion material.

[0041] 2. Place a measured amount of slow-expansion material into an amorphous thin-walled metal container, and then inject water at a volume 1 to 1.5 times greater than the maximum water absorption capacity. Use the liquid pressure differential evacuation method to remove air from the container. Figure 2 , Figure 3 As shown, the specific operation is as follows: A first check valve 10 and a second check valve 11 are installed at the opening of the thin-walled metal can. The first check valve 10 is the vent port, and the second check valve 11 is the injection port. The mechanical valves on the first check valve 10 and the second check valve 11 are opened, and the medium is filled into the amorphous thin-walled metal can through the feed port. The can opening is then tightly sealed, and the mechanical valves of the first check valve 10 and the second check valve 11 are opened. The medium is then injected through the second check valve 11. When the medium overflows from the first check valve 10, the mechanical valves of the first check valve 10 and the second check valve 11 are closed simultaneously, completing the air venting process inside the can.

[0042] 3. Place the emptied amorphous thin-walled metal can into the pressure test tank, close the can tightly, and tighten it with the fastening bolts.

[0043] 4. Inject the medium into the pressure test tank through the vent and pressurization ports until the entire cavity of the spherical pressure tank is completely filled. Open all electronic automatic pressure acquisition gauges; at this point, the pressure gauges will display 0, indicating they are fully open and ready to collect data. Replace the pressurizing injector and continue injecting medium through the vent and pressurization ports. As the slow-expansion material inside the amorphous thin-walled metal tank absorbs water, it begins to expand. Due to the volume limitation of the amorphous thin-walled metal tank, it cannot continue to expand. The slow expansion force is then transferred through the amorphous thin-walled metal tank to the medium inside the spherical pressure tank, realizing the conversion of mechanical force into liquid pressure. According to Pascal's principle of pressure transmission in a static liquid, when the external pressure changes, the pressure at any point in a static liquid in a closed container will change by the same magnitude. Simultaneously, the internal expansion force is equivalent to the externally applied pressure; that is, the pressure applied to a static liquid can be transmitted equally to all points within the liquid. When all electronic automatic pressure acquisition gauges collect the first data, stop injecting medium through the vent and pressurization ports and close them. Record the initial values ​​of the two electronic automatic pressure acquisition gauges respectively.

[0044] 5. Export data from the electronic automatic pressure acquisition gauges every 24 hours. Two electronic automatic pressure acquisition gauges will each capture the release data of the entire slow expansion force and transmit the data to the receiving terminal via Bluetooth. After variance correction for data at the same time point, the receiving terminal will plot the slow expansion force growth curves according to the relationship between time and expansion force. Repeat this process until the pressure curve flattens out, then stop collecting data.

[0045] 6. Plot the final curve, process and calculate the peak expansion force data, and obtain the maximum pressure value.

[0046] The experimental results of this invention are shown in Tables 1-6:

[0047] Table 1 Pressure values ​​in Example 1

[0048]

[0049] The maximum free-state volume expansion rate was 37.5%. The water absorption expansion force test of the solidified polyurethane grouting material was conducted at a pressure test tank temperature of 23±2℃ over a period of 21 days. According to... Figure 6 The convergence trend shown has a maximum average pressure value of 0.268 MPa.

[0050] Table 2 Pressure values ​​in Example 2

[0051]

[0052] The maximum free-state volume expansion rate was 27% for the solidified polyurethane grout material, and the water absorption expansion force was tested. The pressure test tank temperature was 23±℃, and the test period was 23 days. According to... Figure 7 The convergence trend shown has a maximum average pressure value of 0.134 MPa.

[0053] Table 3 Pressure values ​​in Example 3

[0054]

[0055] The maximum free-state volume expansion rate was 24% for the solidified polyurethane grout material, and the water absorption expansion force was tested. The pressure test tank temperature was 23±℃, and the test period was 23 days. According to... Figure 8 The convergence trend shown has a maximum average pressure value of 0.166 MPa.

[0056] Table 4 Pressure values ​​in Example 4

[0057]

[0058] The maximum free-state volume expansion rate was 24% for the solidified polyurethane grout material, and the water absorption expansion force was tested. The pressure test tank temperature was 23±℃, and the test period was 13 days. According to... Figure 9 The convergence trend shown has a maximum average pressure value of 0.176 MPa.

[0059] Table 5 Pressure values ​​in Example 5

[0060]

[0061] The maximum free-state volume expansion rate was 27% for the solidified polyurethane grout material, and the water absorption expansion force was tested. The pressure test tank temperature was 23±℃, and the test period was 20 days. According to... Figure 10 The convergence trend shown has a maximum average pressure value of 0.189 MPa.

[0062] Table 6 Pressure values ​​in Example 6

[0063]

[0064] The maximum free-state volume expansion rate was 23.4% for the water absorption expansion force test of the solidified polyurethane grouting material. The tank temperature was 23±2℃, and the test period was 14 days. According to... Figure 11 The convergence trend shown has a maximum average pressure value of 0.175 MPa.

[0065] To further verify the testing principle, this application does not place a slow-expansion material or its absorbent medium inside the amorphous thin-walled metal container. Instead, it directly injects pressure into the amorphous thin-walled metal container using an external pressure source 12. Figure 5 As shown, the other parts follow the same steps as described above to simulate the process of the slowly expanding material absorbing the medium and generating expansion force, thus verifying the feasibility of the device designed in this invention, as shown in Table 7. Figure 12 As shown.

[0066] Table 7. Pressure values ​​(kPa) of the pressure tank verification test in Example 7

[0067]

[0068] The above embodiments are used to explain and illustrate the present invention, but not to limit the present invention. Any modifications and changes made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A method for collecting a slow-bending force test, characterized by, The slow expansion body material is filled into the non-crystal thin-walled metal tank and injected into the absorption medium of the slow expansion body material, and then the non-crystal thin-walled metal tank is placed in a container filled with liquid medium, the material of the thin-walled metal tank is a thin-walled metal tank made of a copper-based non-magnetic non-crystal alloy and an iron-based amorphous alloy, the mass ratio of Cu, Fe and Ti metal elements in the material is 64:22.5:13.5 in turn, the material has a non-crystal / nanocrystalline composite structure, wherein the volume fraction of the non-crystal is 60-80%, and the volume fraction of the nanocrystal is 40-20%, the thickness of the tank wall sheet is 0.1-0.15 mm; the liquid medium is a dimethyl silicone oil and a phosphate ester hydraulic oil composition, and the combined volume ratio is 30-40:70-60; the slow expansion body material expands in volume during the absorption of the absorption medium, the volume change of the non-crystal thin-walled metal tank during expansion and the expansion force generated by the expansion of the slow expansion body absorbed by the expansion can be ignored; the mechanical force generated by the expansion is transmitted to the liquid medium through the non-crystal thin-walled metal tank, and is converted into hydraulic pressure for measurement, and the slow expansion force data is obtained.

2. The method of claim 1, wherein the method is a slow expansion force collection test method. After the slow expansion body material is filled into the non-crystal thin-walled metal tank, the liquid medium differential pressure emptying method is used to empty the gas in the thin-walled metal tank.

3. A method of collecting a test according to claim 2, wherein, A first non-return valve and a second non-return valve are arranged at the opening of the non-crystal thin-walled metal tank, after the non-crystal thin-walled metal tank is filled with the medium, the first non-return valve and the second non-return valve are opened, the medium continues to be filled through the second non-return valve, when the medium overflows from the first non-return valve due to the pressure difference, the first non-return valve is closed, the filling continues, and after there is no change in the liquid level, the second non-return valve is closed, and the emptying of the non-crystal thin-walled metal tank is completed.

4. The method of claim 1, wherein the method is a slow expansion force collection test method. The injection of the absorption medium is 1-1.5 times the maximum absorption amount of the slow expansion body material.

5. The method of claim 1, wherein the method is a slow expansion force collection test method. The slow expansion body material is a polyurethane grouting material with a maximum expansion rate of 23.4-40.5, and the test period is 12-23 days.

6. The method of claim 1, wherein, The non-crystal thin-walled metal tank is placed in a pressure test tank filled with liquid medium, two electronic automatic pressure gauges are installed on the upper part of the pressure test tank, and are used to collect hydraulic pressure data; the pressure test tank has a hollow jacket double-layer structure, and is provided with a water inlet and a water outlet, and can accurately control the temperature of the overall medium in the sphere according to the test needs.

7. A method of collecting a test according to claim 6, wherein, The hydraulic pressure data collected by all electronic automatic pressure collection tables at the same time point are calculated to obtain the average value, and the slow expansion force growth curve graph is drawn according to the relationship between time and slow expansion force, and the peak value data of the slow expansion force is calculated and processed.

8. A slow expansion force collection test apparatus employing the slow expansion force collection test method according to any one of claims 1 to 7, characterized by The device comprises: a non-crystal thin-walled metal tank for containing slow expansion body material and absorption medium of the slow expansion body material; a pressure test tank for placing the non-crystal thin-walled metal tank and filled with liquid medium, the liquid medium is a dimethyl silicone oil and a phosphate ester hydraulic oil composition, and the combined volume ratio is 30-40:70-60; two electronic automatic pressure collection tables are installed on the upper part of the pressure test tank, and are used to collect hydraulic pressure data in the pressure test tank; a receiving terminal for obtaining electronic automatic pressure collection table data, correcting the data at the same time point, drawing a slow expansion force growth curve graph according to the relationship between time and slow expansion force, and calculating and processing the peak value data of the slow expansion force.

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