A test device for providing different corrosion behavior to reinforcing steel

Abstract

The utility model provides a kind of test device that can provide different corrosion behavior for reinforcing steel, including environment simulation unit and auxiliary module;Environment simulation unit includes corrosion tank, chloride ion concentration regulator, electric hot plate and humidity sensor group, corrosion tank inner wall is coated with hydrophobic coating, and corrosion tank is injected with simulation liquid;Auxiliary module contains sample fixture and pH sensor, and sample fixture includes insulating substrate and jaw;Insulating substrate is connected with corrosion tank;Jaw includes clamping head, threaded rod and locking knob.The utility model structure design scientific and reasonable, simulation is accurate, data acquisition is efficient, and practicality is strong, production cost is low, clamping is stable and reliable, and can be used widely.

Description

Technical Field

[0001] This utility model relates to a steel bar testing device, specifically a testing device that can provide different corrosion behaviors for steel bars. Background Technology

[0002] In construction engineering, the durability of concrete structures is severely affected by the corrosion of reinforcing steel. However, there is currently a lack of efficient testing equipment on the market for the corrosion resistance of concrete reinforcing steel, and traditional testing methods and equipment cannot accurately assess its corrosion resistance under complex environments.

[0003] Existing concrete reinforcement corrosion resistance testing equipment has the following problems:

[0004] Limited environmental simulation: It cannot simultaneously control the coupled effects of multiple factors such as chloride ion concentration, humidity, and temperature, resulting in significant differences from the actual concrete environment; poor sample adaptability: The testing accuracy for highly corrosion-resistant materials is insufficient, making it difficult to capture their microscopic corrosion characteristics; complex operation.

[0005] Therefore, it is of great significance to develop a testing device specifically for various types of reinforcing bars. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a testing device that can provide different corrosion behaviors of steel bars, which addresses the shortcomings of the prior art. The device has a scientific and reasonable structural design, accurate simulation, efficient data acquisition, strong practicality, low manufacturing cost, stable and reliable clamping, and can be widely used.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a testing device that can provide different corrosion behaviors for steel bars, characterized in that it includes an environmental simulation unit and an auxiliary module;

[0008] The environmental simulation unit includes a corrosion tank, a chloride ion concentration regulator, an electric heating plate, and a humidity sensor. The inner wall of the corrosion tank is coated with a hydrophobic coating, and a simulation liquid is injected into the corrosion tank.

[0009] The auxiliary module includes a sample clamp and a pH sensor. The sample clamp includes an insulating substrate and claws. The insulating substrate is connected to the corrosion tank. The claws include a clamping head, a threaded rod, and a locking knob. The clamping head clamps both ends of the sample steel bar.

[0010] Preferably, the chloride ion concentration regulator includes a peristaltic pump and a sodium chloride solution storage tank. The sodium chloride solution storage tank is connected to the inlet of the peristaltic pump through a pipe, and the outlet of the peristaltic pump is connected to the corrosion tank through a pipe. The electric heating plate is installed in the corrosion tank to control the temperature of the simulated liquid. A chloride ion concentration sensor and a humidity sensor are installed in the corrosion tank.

[0011] Preferably, slide rails are provided on the opposite side walls of the corrosion tank, the insulating substrate is slidably mounted on the slide rails, the insulating substrate is provided with a positioning element to fix the relative position of the insulating substrate and the slide rails, a strip-shaped mounting hole is opened on the insulating substrate, one end of the threaded rod passes through the strip-shaped mounting hole, the other end of the threaded rod is fixedly connected to a clamping head, and a locking knob is threaded to one end of the threaded rod that passes through the strip-shaped mounting hole.

[0012] Preferably, the strip-shaped mounting hole has graduation lines on its side, the clamping head has a limiting cylinder adapted to the diameter of the sample steel bar, a damper is installed along the length direction inside the strip-shaped mounting hole, and a limiting pressure plate is magnetically wrapped around the sample steel bar. The limiting pressure plate is semi-cylindrical and has multiple seepage holes of different sizes and shapes. Sealing plugs are installed on the seepage holes. Different specifications of the limiting pressure plate are prepared for sample steel bars of different diameters. Sealing strips are installed at the joints between the limiting pressure plates and at the joints between the limiting pressure plate and the limiting cylinder. Multiple sizes of the adapting cylinder are prepared according to common steel bar models.

[0013] Preferably, the mass percentage of the simulated liquid is 0.1-0.3% Ca(OH)2, 0.05-0.1% NaOH, and 0.05-0.1% KOH, and the sample clamp is made of polyetheretherketone material.

[0014] This utility model has the following advantages compared with the prior art:

[0015] 1. The structure of this utility model is scientifically and rationally designed, simple to operate, and has stable and reliable clamping. It can control different corrosion positions of the sample steel bars through the limiting pressure plate, and make more intuitive and accurate comparisons.

[0016] 2. The environmental simulation of this utility model is comprehensive, accurate and closely matches reality, the clamping is stable and reliable, and it can be flexibly changed according to the diameter of the steel bar.

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a partially enlarged structural schematic diagram of the sample clamp position in this utility model.

[0020] Figure 3 This is a top view of the limiting pressure plate in this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] Detailed Implementation

[0023] like Figures 1 to 3 As shown, this utility model includes an environmental simulation unit and an auxiliary module;

[0024] The environmental simulation unit includes a corrosion tank 1, a chloride ion concentration regulator, an electric heating plate 4, and a humidity sensor. The inner wall of the corrosion tank 1 is coated with a hydrophobic coating, and a simulation liquid is injected into the corrosion tank 1.

[0025] The auxiliary module includes a sample clamp 2 and a pH sensor 3. The sample clamp 2 includes an insulating substrate 2-1 and a jaw; the insulating substrate 2-1 is connected to the etching tank 1; the jaw includes a clamping head 2-3, a threaded rod 2-2, and a locking knob 2-4. The pH sensor 3 is installed in the etching tank 1 to monitor the pH value of the simulated solution.

[0026] In this embodiment, the chloride ion concentration regulator includes a peristaltic pump 7 and a sodium chloride solution storage tank 8. The sodium chloride solution storage tank 8 is connected to the inlet of the peristaltic pump 7 through a pipe, and the outlet of the peristaltic pump 7 is connected to the corrosion tank 1 through a pipe. The electric heating plate 4 is installed in the corrosion tank 1 to control the temperature of the simulated liquid. A chloride ion concentration sensor and a humidity sensor are installed in the corrosion tank 1. The humidity sensor is a humidity sensor for solutions, such as the German B+B Thermo-Technik humidity sensor.

[0027] In this embodiment, the sample steel bar 6 is connected to an existing electrochemical workstation. The integrated display on the electrochemical workstation is used to display electrochemical reference charts characterizing the corrosion degree of the sample steel bar 6, such as potential-time curves, Nyquist plots, Bode plots, etc.

[0028] In this embodiment, slide rails 10 are provided on the opposite side walls of the corrosion tank 1. The insulating substrate 2-1 is slidably mounted on the slide rails 10 by a slider. The insulating substrate 2-1 is provided with a positioning member 2-5 to fix the relative position of the insulating substrate 2-1 and the slide rails 10. A strip-shaped mounting hole 2-6 is opened on the insulating substrate 2-1. One end of the threaded rod 2-2 passes through the strip-shaped mounting hole 2-6, and the other end of the threaded rod 2-2 is fixedly connected to a clamping head 2-3. A locking knob 2-4 is threadedly connected to one end of the threaded rod 2-2 that passes through the strip-shaped mounting hole 2-6.

[0029] In this embodiment, the side of the strip-shaped mounting hole 2-6 is provided with scale lines, the clamping head 2-3 is provided with a limiting cylinder adapted to the diameter of the sample steel bar 6, a damper is provided inside the strip-shaped mounting hole 2-6 along the length direction, and a limiting pressure plate 5 is magnetically wrapped around the sample steel bar 6. The limiting pressure plate 5 is semi-cylindrical and has multiple seepage holes 9 of different sizes and shapes. Sealing plugs are provided on the seepage holes 9. The limiting pressure plate 5 is made with different specifications for sample steel bars 6 of different diameters. Sealing strips are provided at the joints between the limiting pressure plates 5 and at the joints between the limiting pressure plate 8 and the limiting cylinder. Multiple sizes of the adapting cylinder are prepared according to common steel bar models.

[0030] In this embodiment, a top cover is provided on the top of the corrosion tank 1, and a transparent observation window is provided on the top cover.

[0031] In this embodiment, the mass percentage of the simulated liquid is 0.1-0.3% Ca(OH)2, 0.05-0.1% NaOH, and 0.05-0.1% KOH, and the sample clamp is made of polyetheretherketone material.

[0032] During use, the steel bar sample 6 is fixed inside the limiting cylinder, the limiting pressure plate 5 is installed, and the sealing plug on the seepage hole 9 corresponding to the preset observation position is opened, immersing it in the simulated liquid; the chloride ion concentration of the simulated liquid is adjusted to the target value and the temperature is kept constant at 25℃ by the peristaltic pump 7 and the electric heating plate 4; the sample steel bar 6 is connected to the existing electrochemical workstation, and after starting the electrochemical workstation, the corrosion current density is obtained by the Tafel polarization method; the pH value and humidity change are monitored in real time, and the data is transmitted to the electrochemical workstation through the data acquisition module; after the test, the sample is taken out for SEM micromorphology analysis.

[0033] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A testing device capable of providing different corrosion behaviors for reinforcing bars, characterized in that, Includes an environmental simulation unit and auxiliary modules; The environmental simulation unit includes a corrosion tank (1), a chloride ion concentration regulator, an electric heating plate (4), and a humidity sensor. The inner wall of the corrosion tank (1) is coated with a hydrophobic coating, and the corrosion tank (1) is filled with a simulation liquid. The auxiliary module includes a sample clamp (2) and a pH sensor (3). The sample clamp (2) includes an insulating substrate (2-1) and a jaw. The insulating substrate (2-1) is connected to the corrosion tank (1). The jaw includes a clamping head (2-3), a threaded rod (2-2), and a locking knob (2-4). The clamping head (2-3) is used to clamp the sample steel bar. The corrosion tank (1) has slide rails (10) on its opposite side walls. The insulating substrate (2-1) is slidably mounted on the slide rails (10). The insulating substrate (2-1) is provided with a positioning element (2-5) to fix the relative position of the insulating substrate (2-1) and the slide rails (10). The insulating substrate (2-1) has a strip-shaped mounting hole (2-6). One end of the threaded rod (2-2) passes through the strip-shaped mounting hole (2-6). The other end of the threaded rod (2-2) is fixedly connected to a clamping head (2-3). The end of the threaded rod (2-2) that passes through the strip-shaped mounting hole (2-6) is threadedly connected to a locking knob (2-4).

2. The testing device according to claim 1, which can provide different corrosion behaviors for reinforcing bars, is characterized in that, The chloride ion concentration regulator includes a peristaltic pump (7) and a sodium chloride solution storage tank (8). The sodium chloride solution storage tank (8) is connected to the inlet of the peristaltic pump (7) through a pipe. The outlet of the peristaltic pump (7) is connected to the corrosion tank (1) through a pipe. The electric heating plate (4) is installed in the corrosion tank (1) to control the temperature of the simulated liquid. A chloride ion concentration sensor and a humidity sensor are installed in the corrosion tank (1).

3. The testing device according to claim 1, which can provide different corrosion behaviors for reinforcing bars, is characterized in that, The strip-shaped mounting hole (2-6) has scale lines on its side. The clamping head (2-3) is provided with a limiting cylinder that is adapted to the diameter of the sample steel bar (6). The strip-shaped mounting hole (2-6) is provided with a damper along its length. The sample steel bar (6) is magnetically wrapped with a limiting pressure plate (5). The limiting pressure plate (5) is semi-cylindrical. The limiting pressure plate (5) has multiple seepage holes (9) of different sizes and shapes. The seepage holes (9) are provided with sealing plugs.

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