Experimental device and method for researching mechanical properties of single-bundle carbon fiber after polarization under action of ICCP (Inductively Coupled Carbon Polymer)

Abstract

The invention discloses an experimental device and method for researching mechanical properties of a single-bundle carbon fiber after polarization under the action of ICCP. The experimental device comprises a single-bundle carbon fiber tensioning device, a cathode protection device and a circuit device, the cathode protection device comprises a tank body and two supporting structures, the first end part of the single-bundle carbon fiber extends out of the tank body from the first via hole and is connected with a circuit device; the steel bar and the second through hole are sealed, and the first end of the steel bar extends out of the groove body from the second through hole and is connected with the circuit device. The ICCP working condition scene of the impressed current cathodic protection system is constructed by simulating the reinforced concrete in the coastal region and matching with the carbon fibers, and the cathodic protection experiment of the reinforcing steel bars is carried out, so that the performance change of the single-beam carbon fibers before and after polarization or under different polarization degrees is researched. In the whole experiment process, a cement-based material is not needed, and the problem that the single-bundle carbon fiber is separated from the cement-based material and damaged does not exist, so that the accuracy of measuring the mechanical property of the single-bundle carbon fiber is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of civil engineering reinforcement material measurement, and particularly relates to an experimental device and method for researching mechanical properties of single-beam carbon fibers after polarization under ICCP. BACKGROUND

[0002] In the field of modern civil engineering structure reinforcement, as the service life of infrastructure increases, the structure faces various durability problems such as chloride ion erosion, carbonization, and the like, and the problem of steel bar corrosion of coastal structures is particularly serious. As a kind of corrosion protection technology based on electrochemical principle, the impressed current cathodic protection (ICCP) system can effectively inhibit the corrosion of metal by applying a cathodic current to the protected metal, so that the metal surface potential is negatively shifted to the corrosion-free zone, thereby gradually becoming an important corrosion protection means in coastal areas. In concrete structures, the ICCP system not only prolongs the service life of steel bars, but also realizes intelligent and precise protection by optimizing protection parameters. At the same time, carbon fiber reinforced cementitious matrix (C-FRCM) composite material is widely used in the field of civil engineering reinforcement due to its excellent properties such as high strength, high modulus, corrosion resistance and good electrical conductivity. In the ICCP system, the C-FRCM composite material has the dual functions of anode protection material and structural reinforcement material. On the one hand, as an anode sacrificial material, C-FRCM utilizes its electrical conductivity and electrochemical activity to form a stable current path in the ICCP system, and through its electrochemical oxidation reaction, it consumes anode current to protect the metal components in the structure; on the other hand, C-FRCM can significantly improve the tensile, shear and fatigue resistance of the overall structure by virtue of its excellent mechanical properties, thereby enhancing the load-carrying capacity and ductility.

[0003] However, current research on C-FRCM composites in ICCP systems still faces numerous limitations. Existing studies have largely focused on analyzing the mechanical properties of components reinforced with carbon fiber mesh at the macroscale, exploring their capacity-enhancing effects through loading tests on components such as beams and columns. However, from a microscopic perspective in materials science, research on the evolution of the mechanical properties of single-bundle carbon fibers in ICCP systems is severely lacking. As the fundamental load-bearing unit of carbon fiber mesh, the mechanical properties of single-bundle carbon fibers are significantly influenced by the coupling of the electrochemical environment, loading conditions, and environmental factors of the ICCP system. Because carbon fibers typically have a diameter of 5 to 8 μm and are distributed in a three-dimensional, random pattern within cement-based materials, they adhere tightly to cement hydration products. This makes it difficult to non-destructively separate them from the carbon fiber mesh after ICCP action using conventional material testing methods. Conventional mechanical stripping or chemical dissolution methods are known to damage the carbon fiber surface, introducing defects that prevent the mechanical property data obtained from truly reflecting its intrinsic performance in the ICCP system. This research status makes it impossible to establish a quantitative relationship between the micromechanical properties of carbon fiber and the macromechanical behavior of carbon fiber mesh, which restricts the optimal design and rational application of carbon fiber materials in ICCP systems.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an experimental device and method for studying the mechanical properties of a single bundle of carbon fibers after polarization under the action of ICCP, in response to the above-mentioned defects of the prior art, in order to solve the problem of inaccurate measurement of the mechanical properties of carbon fibers in the ICCP system in the prior art.

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0007] An experimental device for studying the mechanical properties of a single bundle of carbon fibers after polarization under the action of ICCP, comprising: a single bundle of carbon fibers tensioning device, a cathodic protection device, and a circuit device; the single bundle of carbon fibers tensioning device is configured to install a single bundle of carbon fibers and provide tensioning force to the single bundle of carbon fibers; the cathodic protection device comprises:

[0008] a tank configured to contain a seawater-saturated calcium hydroxide solution;

[0009] Two supporting structures are provided on the groove wall of the groove body, and the two supporting structures are configured to respectively support two ends of the single-bundle carbon fiber tensioning device;

[0010] Wherein, the groove wall of the groove body has a first through hole and a second through hole;

[0011] The liquid surface of the seawater saturated calcium hydroxide solution is located between the first through hole and the single bundle of carbon fibers, a first end of the single bundle of carbon fibers extends from the first through hole to outside of the tank body and connects the circuit device, and the second through hole is located below the support structure.

[0012] The second through hole is configured to mount a steel bar, and the steel bar is sealed with the second through hole, a first end of the steel bar extends from the second through hole to outside of the tank body and connects the circuit device.

[0013] The experimental device for studying the mechanical properties of the single bundle of carbon fibers polarized under the ICCP effect, wherein the single bundle of carbon fibers is located directly above the steel bar.

[0014] The experimental device for studying the mechanical properties of the single bundle of carbon fibers polarized under the ICCP effect, wherein the tank wall of the tank body has a placement groove, and a second end of the steel bar is inserted into the placement groove.

[0015] The experimental device for studying the mechanical properties of the single bundle of carbon fibers polarized under the ICCP effect, wherein the single bundle of carbon fiber tensioning device and the cathodic protection device are both formed by splicing acrylic plates.

[0016] The experimental device for studying the mechanical properties of the single bundle of carbon fibers polarized under the ICCP effect, wherein the single bundle of carbon fibers is arranged in parallel with the steel bar.

[0017] The experimental device for studying the mechanical properties of the single bundle of carbon fibers polarized under the ICCP effect, wherein the single bundle of carbon fiber tensioning device comprises:

[0018] A frame structure having a third through hole and a fourth through hole;

[0019] The second end of the single bundle of carbon fibers passes through and is fixed in the third through hole, and the fourth through hole is passed through and fixed near the first end of the single bundle of carbon fibers.

[0020] The experimental device for studying the mechanical properties of the single bundle of carbon fibers polarized under the ICCP effect, wherein the circuit device comprises:

[0021] A direct current power supply;

[0022] A current stabilizing plate electrically connected with the direct current power supply;

[0023] The output voltage of the direct current power supply is 0-30V, and the current is 0-1A;

[0024] The current accuracy of the current stabilizing plate is ±0.001mA;

[0025] The current stabilizing plate is electrically connected with the first end of the single carbon fiber and the first end of the steel bar, respectively.

[0026] The test method for the experimental device for researching the mechanical properties of the single carbon fiber after polarization under the ICCP action according to any one of the above, comprising the steps of:

[0027] The steel bar is inserted into the groove from the second through hole, and the first end of the steel bar is located outside the groove, and the gap between the steel bar and the second through hole is sealed;

[0028] The seawater saturated calcium hydroxide solution is placed into the groove until the liquid level of the seawater saturated calcium hydroxide solution is located at the preset position;

[0029] The single carbon fiber is installed on the single carbon fiber tensioning device and placed on the support structure, the single carbon fiber is located below the liquid level of the seawater saturated calcium hydroxide solution, and the first end of the single carbon fiber is passed through the first through hole to the outside of the groove;

[0030] The first end of the steel bar and the first end of the single carbon fiber are connected to the circuit device, respectively, and the circuit device is started to supply power to the steel bar and the single carbon fiber.

[0031] The test method for the experimental device for researching the mechanical properties of the single carbon fiber after polarization under the ICCP action, wherein the single carbon fiber is installed on the single carbon fiber tensioning device and placed on the support structure, specifically comprising:

[0032] The second end of the single carbon fiber is passed through the third through hole and fixed by instant glue;

[0033] The first end of the single carbon fiber is passed through the fourth through hole, and after the single carbon fiber is straightened, the position corresponding to the fourth through hole on the single carbon fiber is fixed by glue;

[0034] The two ends of the single carbon fiber tensioning device are placed on the support structure, respectively.

[0035] The test method for the experimental device for researching the mechanical properties of the single carbon fiber after polarization under the ICCP action, wherein the tension of the single carbon fiber when straightened is adjustable.

[0036] Beneficial Effects: This application simulates the ICCP operating scenario when an impressed current cathodic protection system is constructed with reinforced concrete and carbon fiber in coastal areas. Specifically, a seawater-saturated calcium hydroxide solution is used to simulate the corrosion environment of a cement-based material containing seawater. Voltage is applied to the steel bars and a single bundle of carbon fibers. This allows for experiments on the cathodic protection of steel bars to study the performance changes of a single bundle of carbon fibers before and after the experiment. No cement-based materials are required during the entire experimental process, and there is no problem of a single bundle of carbon fibers being separated and damaged from the cement base. Therefore, the accuracy of the mechanical property measurements of a single bundle of carbon fibers is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a functional principle block diagram of an experimental device for studying the mechanical properties of a single bundle of carbon fibers after polarization under ICCP in an embodiment of the present invention.

[0038] Figure 2 This is a first structural schematic diagram of a single-bundle carbon fiber tensioning device and a cathodic protection device in an embodiment of the present invention.

[0039] Figure 3 1 is a second structural schematic diagram of a single-bundle carbon fiber tensioning device and a cathodic protection device in an embodiment of the present invention.

[0040] Figure 4 1 is a top view of a single-bundle carbon fiber tensioning device and a cathode protection device in an embodiment of the present invention.

[0041] Figure 5 yes Figure 4 A-axis sectional view.

[0042] Figure 6 1 is a first structural schematic diagram of a single-bundle carbon fiber tensioning device in an embodiment of the present invention.

[0043] Figure 7 2 is a second structural schematic diagram of a single-bundle carbon fiber tensioning device according to an embodiment of the present invention.

[0044] Figure 8 Schematic diagram of the structure of the cathodic protection device in an embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 10. Single-bundle carbon fiber tensioning device; 11. Frame structure; 111. Third through-hole; 112. Fourth through-hole; 20. Cathodic protection device; 21. Trough body; 211. First through-hole; 212. Second through-hole; 213. Placement trough; 22. Support structure; 30. Circuit device; 31. DC power supply; 32. Current stabilizer; 40. Single-bundle carbon fiber; 41. First end; 42. Second end; 50. Rebar; 51. First end; 52. Second end. DETAILED DESCRIPTION

[0047] In order to make the objects, technical solutions and advantages of the present application clearer and more apparent, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0048] Please refer to Figures 1-8 , some embodiments of an experimental device for studying the mechanical properties of a single bundle of carbon fibers after polarization under the action of ICCP are provided.

[0049] As Figure 1 shown, the experimental device for studying the mechanical properties of a single bundle of carbon fibers after polarization under the action of ICCP of the present application comprises a single bundle of carbon fiber tensioning device 10, a cathodic protection device 20 and a circuit device 30. The single bundle of carbon fiber tensioning device 10 is configured to mount a single bundle of carbon fibers 40 and provide tension to the single bundle of carbon fibers 40; the cathodic protection device 20 is configured to mount the single bundle of carbon fibers 40 and the steel bar 50 to form a device of impressed current cathodic protection system, and the circuit device 30 is configured to provide electrical energy to the single bundle of carbon fibers 40 and the steel bar 50 (arrow in the middle indicates power supply). Figure 1 By providing electrical energy to the single bundle of carbon fibers 40 and the steel bar 50 through the circuit device 30, the single bundle of carbon fibers 40 is sacrificed and the steel bar 50 is protected, and after the test, the performance (such as mechanical properties) of the single bundle of carbon fibers 40 can be tested.

[0050] As Figure 1 and Figure 2 shown, the cathodic protection device 20 comprises:

[0051] a tank body 21 configured to contain seawater saturated with calcium hydroxide solution;

[0052] two support structures 22 arranged on the tank wall of the tank body 21, and the two support structures 22 are configured to support the two ends of the single bundle of carbon fiber tensioning device 10, respectively;

[0053] wherein the tank wall of the tank body 21 has a first through hole 211 and a second through hole 212; the liquid surface of the seawater saturated with calcium hydroxide solution is located between the first through hole 211 and the single bundle of carbon fibers 40, the first end portion 41 of the single bundle of carbon fibers 40 extends from the first through hole 211 to the outside of the tank body 21 and is connected to the circuit device 30, and the second through hole 212 is located below the support structure 22; the second through hole 212 is configured to mount the steel bar 50, and the steel bar 50 is sealed with the second through hole 212, and the first end portion 51 of the steel bar 50 extends from the second through hole 212 to the outside of the tank body 21 and is connected to the circuit device 30.

[0054] Specifically, the tank body 21 has a containing space, which can contain seawater saturated calcium hydroxide solution, seawater saturated calcium hydroxide solution is seawater added with calcium hydroxide, and the amount of calcium hydroxide added is sufficient to reach saturation, seawater saturated calcium hydroxide solution is used to simulate a cement-based corrosion environment containing seawater, and the content of calcium hydroxide is 2wt%-7wt%. The solution simulates the cement-based pore solution in seawater. The simulated seawater solution configured according to the standard “Standard Practice for the Preparation of Substitute Ocean Water” ASTM D1141-1998 (2013) is added with calcium hydroxide powder until a small amount of calcium hydroxide precipitates, and the solution is a simulated seawater saturated calcium hydroxide solution (see Table 1 for details). The solution configuration process is as follows: “According to Table 1, the seawater saturated calcium hydroxide solution is prepared according to the following steps: ① Take 1L deionized water and heat it to 25±2℃; ② Add NaCl, MgCl2·6H2O, Na2SO4 and other reagents (in the order of the table) in turn, and stir at a speed of 300r / min for 10min after adding each reagent until completely dissolved; ③ Finally, add Ca(OH)2 powder, stir for 30min, and then stand for 24h. Take the upper clear liquid as the experimental solution, and control the pH value of the solution to be 12.5±0.2.

[0055] The tank body 21 can be a cuboid, the tank body 21 includes a tank bottom plate and four tank walls, the four tank walls are connected with the tank bottom plate, and the four tank walls are connected in turn, the tank bottom plate is a rectangle, and the tank walls are divided into long side tank walls and short side tank walls. The support structure 22 is arranged on the tank wall, and the support structure 22 has two, which are arranged on two corresponding tank walls. The two support structures 22 are arranged on the corresponding short side tank walls. The two support structures 22 have a spacing therebetween. The support structure 22 can support the single-bundle carbon fiber tensioning device 10, the two ends of the single-bundle carbon fiber tensioning device 10 are located on the corresponding support structures 22 respectively, and the middle part of the single-bundle carbon fiber tensioning device 10 is suspended and corresponds to the position of the steel bar 50.

[0056] Table 1: Simulated cement-based pore solution mix proportion (experimental temperature 25±2℃)

[0057]

[0058] As Figure 3 , Figure 6 and Figure 7As shown, the first via hole 211 and the second via hole 212 are formed on the groove wall, and the first via hole 211 and the second via hole 212 are located on the same groove wall, specifically on the same short side groove wall. The first via hole 211 is located above the second via hole 212, and the first via hole 211 is used for the single-beam carbon fiber 40 to pass through, and the second via hole 212 is used for the steel bar 50 to pass through. The gap between the second via hole 212 and the steel bar 50 is sealed to prevent the leakage of seawater saturated calcium hydroxide solution. Most of the steel bar 50 is located in the tank body 21, and a small part of the steel bar 50 is located outside the tank body 21. The liquid level of the seawater saturated calcium hydroxide solution needs to cover the single-beam carbon fiber 40 and the steel bar 50, and the first via hole 211 can be located above the liquid level of the seawater saturated calcium hydroxide solution, and the seawater saturated calcium hydroxide solution will not leak from the first via hole 211. Of course, the gap between the single-beam carbon fiber 40 and the first via hole 211 can also be sealed. Most of the single-beam carbon fiber 40 is located in the tank body 21, and a small part of the single-beam carbon fiber 40 is located outside the tank body 21. The first end part 51 of the steel bar 50 located outside the tank body 21 and the first end part 41 of the single-beam carbon fiber 40 located outside the tank body 21 are connected to the circuit device 30, respectively. The first end part 51 of the steel bar 50 is connected to the cathode of the circuit device 30, and the first end part 41 of the single-beam carbon fiber 40 is connected to the anode of the circuit device 30.

[0059] In the present application, the ICCP working condition scene of the reinforced concrete with carbon fiber in the coastal area is simulated, specifically, the seawater saturated calcium hydroxide solution is used to simulate the cement-based corrosion environment containing seawater, and the voltage is applied to the steel bar 50 and the single-beam carbon fiber 40, so that the cathodic protection experiment of the steel bar 50 can be carried out, and the performance change of the single-beam carbon fiber 40 before and after the experiment can be studied. In the whole experiment process, the cement-based material is not needed, and the single-beam carbon fiber 40 is not separated from the cement-based material and damaged, so that the accuracy of the mechanical property measurement of the single-beam carbon fiber 40 is higher.

[0060] In a preferred implementation manner of the embodiment of the present application, as shown in Figure 4 and Figure 5 The single-beam carbon fiber 40 is located directly above the steel bar 50.

[0061] Specifically, the single-beam carbon fiber 40 is located directly above the steel bar 50, so that the spacing between the single-beam carbon fiber 40 and the steel bar 50 is determined and can be calculated. Under the condition of fixing the spacing between the single-beam carbon fiber 40 and the steel bar 50, other parameters are changed, and the performance of the single-beam carbon fiber 40 under different conditions can be obtained.

[0062] In a preferred implementation manner of the embodiment of the present application, as shown in Figure 5 and Figure 6 The groove wall of the tank body 21 has a placing groove 213, and the second end part 52 of the steel bar 50 is inserted into the placing groove 213.

[0063] Specifically, a placement groove 213 is provided on the groove wall, and the placement groove 213 is used to place the second end portion 52 of the steel bar 50. The height of the placement groove 213 is consistent with the height of the second through hole 212, so the steel bar 50 is arranged horizontally.

[0064] In a preferred implementation of the embodiment of the present invention, the single-bundle carbon fiber tensioning device 10 and the cathode protection device 20 are both formed by splicing acrylic plates.

[0065] Specifically, the single-bundle carbon fiber tensioning device 10 can be integrally formed using acrylic plates, or can be spliced ​​together using acrylic plates. The cathodic protection device 20 is spliced ​​together using acrylic plates, and both the tank bottom plate and the tank wall are made of acrylic plates. The support structure 22 is a rectangular parallelepiped, with a length of 60mm to 100mm, a width of 20mm to 40mm, and a thickness of 5mm to 15mm. The length of the internal space of the tank body 21 is 220mm to 320mm, a width of 60mm to 100mm, and a height of 60mm to 120mm. The diameter of the first through hole 211 is 7mm to 12mm, and the diameter of the second through hole 212 is 7mm to 12mm. The wall thickness of the tank body 21 is 3mm to 10mm.

[0066] In a preferred implementation of the embodiment of the present invention, Figure 4 and Figure 5 As shown, the single bundle of carbon fibers 40 is arranged parallel to the steel bars 50 .

[0067] Specifically, the single carbon fiber bundle 40 is arranged parallel to the steel bar 50, so the minimum distance between any point of the single carbon fiber bundle 40 and the steel bar 50 is the same, which is conducive to uniform polarization of the single carbon fiber bundle 40 and further improves the accuracy and reliability of the experimental results.

[0068] In a preferred implementation of the embodiment of the present invention, Figure 5 and Figure 8 As shown, the single-bundle carbon fiber tensioning device 10 includes:

[0069] A frame structure 11 having a third via hole 111 and a fourth via hole 112;

[0070] The second end portion 42 of the single bundle of carbon fibers 40 passes through and is fixed in the third through hole 111 , and the position close to the first end portion 41 of the single bundle of carbon fibers 40 passes through and is fixed in the fourth through hole 112 .

[0071] Specifically, the middle part of the frame structure 11 is formed with a through hole, and the through hole of the frame structure 11 faces the steel bar 50. The frame structure 11 is specifically a rectangular frame structure, and the middle part of the rectangular frame structure is formed with a rectangular through hole. The third via hole 111 and the fourth via hole 112 are formed on the frame structure 11, and the single-beam carbon fiber 40 passes through the third via hole 111 and the fourth via hole 112 in sequence and is fixed in the third via hole 111 and the fourth via hole 112. The first end part 41 of the single-beam carbon fiber 40 passes through the fourth via hole 112 and extends through the first via hole 211 to the outside of the groove body 21. The length of the through hole is 200mm-300mm, the width is 15mm-30mm, and the height is 10mm-20mm. The diameter of the third via hole 111 is 4mm-8mm, and the diameter of the fourth via hole 112 is 4mm-8mm. The wall thickness of the frame structure 11 is 3mm-10mm.

[0072] In a preferred implementation form of the embodiment of the present application, as shown in Figure 1 The circuit device 30 comprises:

[0073] a direct current power supply 31;

[0074] a current stabilizing plate 32 electrically connected with the direct current power supply 31;

[0075] The output voltage of the direct current power supply 31 is 0-30V, and the current is 0-1A. The current accuracy of the current stabilizing plate 32 is ±0.001mA. The first end part 41 of the single-beam carbon fiber 40 and the first end part 51 of the steel bar 50 are electrically connected with the current stabilizing plate 32 respectively.

[0076] Specifically, the direct current power supply 31 provides electric energy for the steel bar 50 and the single-beam carbon fiber 40, and the current stabilizing plate 32 is used for stabilizing the current. The first end part 41 of the single-beam carbon fiber 40 and the first end part 51 of the steel bar 50 are connected with the current stabilizing plate 32 respectively.

[0077] Based on the experimental device for researching the mechanical properties of the single-beam carbon fiber after polarization under the ICCP effect according to any one of the above-mentioned embodiments, the present application further provides a preferred embodiment of a test method of the experimental device for researching the mechanical properties of the single-beam carbon fiber after polarization under the ICCP effect.

[0078] The test method of the experimental device for researching the mechanical properties of the single-beam carbon fiber after polarization under the ICCP effect according to the embodiment of the present application comprises the following steps:

[0079] In step S100, the steel bar is inserted into the groove body from the second via hole, and the first end part of the steel bar is located outside the groove body, and the gap between the steel bar and the second via hole is sealed.

[0080] Step S200, placing a seawater saturated calcium hydroxide solution into the tank until the liquid level of the seawater saturated calcium hydroxide solution is at a preset position;

[0081] Step S300, installing a single bundle of carbon fibers on a single bundle of carbon fiber tensioning device and placing it on a support structure, the single bundle of carbon fibers being below the liquid level of the seawater saturated calcium hydroxide solution, and passing the first end of the single bundle of carbon fibers through the first through hole to the outside of the tank;

[0082] Step S400, connecting the first end of the steel bar and the first end of the single bundle of carbon fibers to a circuit device respectively, and starting the circuit device to supply power to the steel bar and the single bundle of carbon fibers.

[0083] Specifically, the single bundle of carbon fibers and the steel bar are installed respectively, and specifically the single bundle of carbon fibers is installed on the single bundle of carbon fiber tensioning device, and the steel bar is installed on the tank. When installing the steel bar, the steel bar is inserted into the tank from the second through hole, most of the steel bar is in the tank, a small part of the steel bar is outside the tank, the first end of the steel bar is outside the tank, and the second end of the steel bar is inserted into the tank. The gap between the steel bar and the second through hole is sealed with glue. After the steel bar is inserted into the hole and completely sealed, seawater saturated calcium hydroxide solution is added to the tank, and the single bundle of carbon fiber tensioning device with the single bundle of carbon fibers is placed on the support structure of the tank, so that the single bundle of carbon fibers is prevented from being damaged by solution flushing when the seawater saturated calcium hydroxide solution is added to the tank. Finally, the first end of the single bundle of carbon fibers is passed through the first through hole to the outside of the tank, and the single bundle of carbon fibers is polarized by power supply.

[0084] Step S200 specifically includes:

[0085] Step S210, passing the second end of the single bundle of carbon fibers through the third through hole and fixing it with instant glue;

[0086] Step S220, passing the first end of the single bundle of carbon fibers through the fourth through hole, straightening the single bundle of carbon fibers, and then fixing the position of the single bundle of carbon fibers corresponding to the fourth through hole with glue;

[0087] Step S230, placing the two ends of the single bundle of carbon fiber tensioning device on the support structure respectively.

[0088] Specifically, when installing the single bundle of carbon fibers, the second end of the single bundle of carbon fibers can be passed through the third through hole and fixed first, then the first end of the single bundle of carbon fibers is passed through the fourth through hole, and the single bundle of carbon fibers is straightened, and then the position close to the first end of the single bundle of carbon fibers is fixed. Specifically, the glue can be filled in the third through hole and the fourth through hole to fix the single bundle of carbon fibers. The instant glue can be cyanoacrylate glue.

[0089] In the installation of the single bundle of carbon fibers, the single bundle of carbon fibers can be sequentially threaded through the third via hole and the fourth via hole first, then the single bundle of carbon fibers is straightened, and the corresponding positions of the third via hole and the fourth via hole on the single bundle of carbon fibers are fixed.

[0090] The tension for straightening the single bundle of carbon fibers is adjustable, and the single bundle of carbon fibers is straightened by different tensions, and the single bundle of carbon fibers is in different tensioning states. When the ICCP system is built for different reinforced concrete, the force received by the carbon fibers is different, and then after the impressed current cathodic protection, the damage mechanism and damage degree of the carbon fibers may also be different. By adjusting the tension for straightening the single bundle of carbon fibers, the actual working condition of the carbon fibers in the specific application scene can be adapted, and the measurement accuracy is further improved.

[0091] The test method further comprises the steps of:

[0092] In step S500, the polarized single bundle of carbon fibers is subjected to a tensile property test to obtain the tensile ultimate strength and the ultimate strain of the single bundle of carbon fibers.

[0093] Specifically, the polarized single bundle of carbon fibers is subjected to a tensile property test according to the specification 'Tensile Property Test Method of Directional Fiber Reinforced Plastic', a test piece is prepared, the length of the single bundle of carbon fibers is 230mm, the two ends are glued and fixed by FRP through epoxy resin, the FRP is a square, the length along the carbon fiber direction is 50mm, and the length along the vertical direction is 30mm, the test loading rate is 0.25mm / min, the phenomena before and after the single bundle of carbon fibers are broken during the test are observed, the microstructure of the carbon fibers under different charge density accumulations is observed by an electron scanning microscope, and the tensile ultimate strength and the ultimate strain of the single bundle of carbon fibers are tested and obtained.

[0094] It should be understood that the application of the present application is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. An experimental device for studying the mechanical properties of a single bundle of carbon fibers after polarization under ICCP, characterized in that: include: Single-bundle carbon fiber tensioning device, cathodic protection device and circuit device; The single-bundle carbon fiber tensioning device is configured to install a single-bundle carbon fiber and provide tensioning force to the single-bundle carbon fiber; the cathodic protection device includes: a tank configured to contain a seawater-saturated calcium hydroxide solution; Two supporting structures are provided on the groove wall of the groove body, and the two supporting structures are configured to respectively support two ends of the single-bundle carbon fiber tensioning device; Wherein, the groove wall of the groove body has a first through hole and a second through hole; The liquid level of the seawater saturated calcium hydroxide solution is located between the first via hole and the single bundle of carbon fibers, the first end of the single bundle of carbon fibers extends from the first via hole to the outside of the tank and is connected to the circuit device, and the second via hole is located below the support structure; The second via hole is configured to install a steel bar, and the steel bar is sealed with the second via hole. The first end of the steel bar extends from the second via hole to outside the slot and is connected to the circuit device.

2. The experimental device for studying the mechanical properties of a single carbon fiber bundle after polarization under ICCP according to claim 1, characterized in that: The single bundle of carbon fibers is located directly above the steel bars.

3. The experimental device for studying the mechanical properties of a single carbon fiber bundle after polarization under ICCP according to claim 1, characterized in that: The slot wall of the slot body is provided with a placement slot, and the second end portion of the steel bar is inserted into the placement slot.

4. The experimental device for studying the mechanical properties of a single carbon fiber bundle after polarization under ICCP according to claim 1, characterized in that: The single-bundle carbon fiber tensioning device and the cathode protection device are both formed by splicing acrylic plates.

5. The experimental device for studying the mechanical properties of a single carbon fiber bundle after polarization under ICCP according to claim 1, characterized in that: The single bundle of carbon fibers is arranged parallel to the steel bars.

6. The experimental device for studying the mechanical properties of a single carbon fiber bundle after polarization under ICCP according to any one of claims 1 to 5, characterized in that: The single-bundle carbon fiber tensioning device comprises: a frame structure having a third via hole and a fourth via hole; The second end of the single bundle of carbon fibers passes through and is fixed in the third through hole, and the position close to the first end of the single bundle of carbon fibers passes through and is fixed in the fourth through hole.

7. The experimental device for studying the mechanical properties of a single carbon fiber bundle after polarization under ICCP according to any one of claims 1 to 5, characterized in that: The circuit device comprises: DC power supply; a current stabilizing plate, electrically connected to the DC power supply; Wherein, the output voltage of the DC power supply is 0-30V and the current is 0-1A; The current accuracy of the current stabilizing plate is ±0.001mA; The flow stabilizing plate is electrically connected to the first end of the single bundle of carbon fibers and the first end of the steel bar, respectively.

8. A test method for an experimental device for studying the mechanical properties of a single carbon fiber bundle after polarization under ICCP as claimed in any one of claims 1 to 7, characterized in that: Including steps: Inserting a steel bar into the slot body from the second through hole, with the first end of the steel bar located outside the slot body, and sealing the gap between the steel bar and the second through hole; placing a seawater saturated calcium hydroxide solution into the tank until the liquid level of the seawater saturated calcium hydroxide solution is at a preset position; Installing a single bundle of carbon fibers on a single bundle of carbon fibers tensioning device and placing the device on a support structure, wherein the single bundle of carbon fibers is located below the liquid surface of the seawater saturated calcium hydroxide solution, and passing a first end portion of the single bundle of carbon fibers through a first through hole to the outside of the tank; The first end of the steel bar and the first end of the single bundle of carbon fibers are respectively connected to a circuit device, and the circuit device is started to supply power to the steel bar and the single bundle of carbon fibers.

9. The test method of the experimental device for studying the mechanical properties of a single carbon fiber bundle after polarization under ICCP according to claim 8, characterized in that: The single-bundle carbon fiber is mounted on a single-bundle carbon fiber tensioning device and placed on a support structure, specifically including: Pass the second end of the single bundle of carbon fibers through the third through-hole and secure it with instant glue; Passing the first end of the single bundle of carbon fibers through the fourth through hole, straightening the single bundle of carbon fibers, and fixing the single bundle of carbon fibers at a position corresponding to the fourth through hole with glue; Place both ends of the single-bundle carbon fiber tensioning device on the supporting structure.

10. The test method of the experimental device for studying the mechanical properties of a single carbon fiber bundle after polarization under ICCP according to claim 9, characterized in that: The pulling force for straightening the single bundle of carbon fibers is adjustable.

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