Concrete chloride ion sensor and detection method

Abstract

The present invention discloses a concrete chloride ion sensor and a detection method, the concrete chloride ion sensor comprises a detection mechanism, an energy supply mechanism and a controller, the controller is respectively connected to the detection mechanism and the energy supply mechanism, the energy supply mechanism comprises a metal sheet and an energy storage capacitor, the metal sheet is respectively connected to the controller and the energy storage capacitor as the positive and negative poles of the energy supply mechanism, the concrete chloride ion sensor is fixed on the steel bar of the component to be constructed, the slurry after pouring reacts with the metal sheet to supply energy for the concrete chloride ion sensor, and the controller transmits the detection data through the steel bar. The present invention does not need to be powered by a battery or an external power supply, but relies on the metal sheet to undergo an oxidation-reduction reaction in cement to generate current, thus avoiding the disadvantage of specially connecting a power line; there is no need to specially lead out a wire to read the detection data, and the signal can be led out by directly connecting the signal interface to the steel bar.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete chloride ion detection, and in particular to a concrete chloride ion sensor and a detection method. Background Art

[0002] Concrete durability refers to the ability of concrete to resist various destructive factors and maintain strength and appearance integrity for a long time under working conditions. In marine concrete, chloride ions will have an adverse effect on concrete and steel bars, reducing the overall durability of concrete. The mechanism is: in an environment with high chloride ion content, steel bars will corrode, and the corrosion products will expand and cause damage to the concrete structure, causing the concrete to provide standard loads and fail to maintain safety and stability within the prescribed period of time.

[0003] Therefore, it is very important to detect the concentration of chloride ions in concrete. Regular detection of the concentration of chloride ions in concrete can provide a basis for the durability maintenance of concrete structures. The control of chloride ions in concrete is generally to form test blocks during design and test the electrical flux or chloride ion diffusion coefficient (see the national standard "Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete (GB / T 50082)"), so as to predict the service life of concrete, but it is impossible to monitor the chloride ion concentration in concrete after service. There are currently two methods for chloride ion detection after concrete service: 1. Destructive detection: The main method is to sample through drilling, test the electrical flux or chloride ion diffusion coefficient of the sample, and compare it with the design. Another method is to grind the drilled concrete and detect the chloride ion concentration in it by chemical methods.

[0004] 2. Non-destructive testing: This method mainly uses buried chloride ion detectors for real-time testing. The detectors can read chloride ion concentration data in a wired or wireless manner. Among them, wireless sensors are generally powered by batteries (active) or wireless power.

[0005] At present, both of the above two detection methods have the following disadvantages: 1. Destructive detection: This method belongs to destructive detection, which requires regular drilling and sampling, and has a large workload. Although the concrete will be backfilled after drilling, it will cause certain damage to the structure; this method cannot be monitored in real time. 2. Non-destructive detection: Although this method will not damage the concrete structure, it also has certain disadvantages. For example, wired sensors need to maintain wiring, and the installation of sensors is difficult; if wireless sensors are powered by batteries, the cost of the sensors is high. If the cost is reduced, it is limited by the battery capacity and the number of detections is limited; if wirelessly powered sensors are used, wireless power supply equipment is required. When the volume of the concrete structure is large, the power supply cannot penetrate the deeper concrete area and cannot effectively power the interior.

[0006] The above-mentioned shortcomings of the prior art result in that the chloride ion concentration of the concrete structure cannot be monitored at a low cost. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a concrete chloride ion sensor on one hand, including a detection mechanism, an energy supply mechanism and a controller, wherein the controller is connected to the detection mechanism and the energy supply mechanism respectively, the energy supply mechanism includes a metal sheet and an energy storage capacitor, the metal sheet as the positive and negative poles of the energy supply mechanism are respectively connected to the controller and the energy storage capacitor, the concrete chloride ion sensor is fixed on the steel bars of the component to be constructed, the poured slurry reacts with the metal sheet to supply energy to the concrete chloride ion sensor, and the controller transmits the detection data through the steel bars.

[0008] Specifically, the detection mechanism is an Ag / AgCl chloride ion sensor, and the Ag / AgCl chloride ion sensor is connected to a controller.

[0009] Specifically, the metal sheet is one or more of a magnesium sheet, a copper sheet, an aluminum sheet, a nickel sheet and an iron sheet.

[0010] Specifically, the metal sheet uses a copper sheet as the positive electrode of the energy supply mechanism, and the copper sheet is connected to the positive electrode of the controller through a wire; the metal sheet uses an aluminum sheet as the negative electrode of the energy supply mechanism, and the aluminum sheet is connected to the negative electrode of the controller through a wire.

[0011] Specifically, the metal sheet is connected in parallel with the energy storage capacitor.

[0012] Specifically, one side of the copper sheet and the aluminum sheet are coated with graphite, and the sides coated with graphite are opposite to each other.

[0013] Specifically, the controller adopts a low-power MCU core board, and the MCU core board adopts one of MSP430, TMS, STM32 and ESP8266.

[0014] Specifically, the controller is connected to the metal sheet via a clamp.

[0015] Another aspect of the present invention provides a method for detecting chloride ions in concrete, comprising the following steps:

[0016] S1: Metal sheet processing: Use 400-grit sandpaper to grind the copper sheet and aluminum sheet smooth, and spray graphite on one side of the copper sheet and aluminum sheet, and let them dry for later use;

[0017] S2: According to the thickness of the copper sheet, aluminum sheet and controller, polylactic acid is used as the raw material, and a 3D-printed fixture is used to clamp the copper sheet, aluminum sheet and controller. The copper sheet is connected to the positive electrode of the controller with a wire, and the aluminum sheet is connected to the negative electrode of the controller with a wire. The positive and negative electrodes of the controller are connected in parallel with a double-layer Farad capacitor. The Ag / AgCl chloride ion sensor is welded to the controller and connected to the analog-to-digital conversion interface of the controller to complete the preparation of the concrete chloride ion sensor.

[0018] S3: Fix the prepared concrete chloride ion sensor to the steel bar of the part to be constructed, and weld the antenna of the controller to the steel bar. After the concrete is poured, the slurry flows between the copper sheet and the aluminum sheet, and the concrete chloride ion sensor starts to work. Connect the signal interface to the steel bar to complete the data reading.

[0019] The beneficial effects of the present invention are: no battery or external power supply is required, and the metal sheet is relied on to undergo an oxidation-reduction reaction in cement to generate current, thereby avoiding the disadvantage of specially connecting a power line; no special lead-out wire is required to read the detection data, and the signal can be led out by directly connecting the signal interface to the steel bar, so that the concrete chloride ion sensor can be placed in a deeper position. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a circuit connection schematic diagram of the present invention;

[0023] Figure 3 This is a flow chart of chloride ion detection of the present invention;

[0024] In the figure, 1-copper sheet, 2-aluminum sheet, 3-fixture, 4-controller, 5-antenna, 6-Ag / AgCl chloride ion sensor, 7-double-layer Farad capacitor. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0028] Embodiment 1:

[0029] See also Figure 1-2 A concrete chloride ion sensor includes a detection mechanism, an energy supply mechanism and a controller 4, wherein the controller 4 is connected to the detection mechanism and the energy supply mechanism respectively, wherein the energy supply mechanism includes a metal sheet and an energy storage capacitor, wherein the metal sheet as the positive and negative electrodes of the energy supply mechanism are respectively connected to the controller 4 and the energy storage capacitor, wherein the concrete chloride ion sensor is fixed on the steel bars of the component to be constructed, and the poured slurry reacts with the metal sheet to supply energy to the sensor, and the controller 4 transmits the detection data through the steel bars.

[0030] Furthermore, the detection mechanism is an Ag / AgCl chloride ion sensor 6 , and the Ag / AgCl chloride ion sensor 6 is connected to the controller 4 .

[0031] Furthermore, the Ag / AgCl chloride ion sensor 6 is soldered to the PCB board of the controller 4 and connected to an analog-to-digital conversion (ADC) port of the controller 4 .

[0032] Furthermore, the present invention does not use batteries or external power supplies, but uses metal sheets as positive and negative electrodes of the power supply and uses energy storage capacitors to store electrical energy.

[0033] Furthermore, the metal sheet is one or more of a magnesium sheet, a copper sheet, an aluminum sheet, a nickel sheet and an iron sheet.

[0034] Preferably, the metal sheet uses a copper sheet 1 as the positive electrode of the energy supply mechanism, and the copper sheet 1 is connected to the positive electrode of the controller 4 through a wire; the metal sheet uses an aluminum sheet 2 as the negative electrode of the energy supply mechanism, and the aluminum sheet 2 is connected to the negative electrode of the controller 4 through a wire.

[0035] Furthermore, the copper sheet 1 and the aluminum sheet 2 are both connected in parallel with the energy storage capacitor.

[0036] Furthermore, the energy storage capacitor is one of a ceramic capacitor, a film capacitor, a farad capacitor or a tantalum capacitor.

[0037] Preferably, the energy storage capacitor is a double-layer farad capacitor 7, the capacity of the double-layer farad capacitor 7 is 10mF-1F, and the withstand voltage level is 2.5V-6.3V.

[0038] Furthermore, the area of ​​the copper sheet 1 and the aluminum sheet 2 are both 9 cm 2 -100cm 2 , the thickness is 1mm-3mm.

[0039] Furthermore, both the copper sheet 1 and the aluminum sheet 2 are polished on both sides with 400-600 mesh sandpaper, and one side of the copper sheet 1 and the aluminum sheet 2 is coated with graphite.

[0040] Furthermore, the distance between the copper sheet 1 and the aluminum sheet 2 is 1 cm-10 cm, and the surfaces coated with graphite are arranged opposite to each other.

[0041] Furthermore, the graphite coating method uses a dry graphite spray or a graphite conductive glue.

[0042] Furthermore, the controller 4 adopts a low-power MCU core board, and the MCU core board adopts one of MSP430, TMS, STM32 and ESP8266.

[0043] Preferably, the controller 4 adopts ESP8266.

[0044] Furthermore, the controller 4 connects the copper sheet 1 and the aluminum sheet 2 respectively through the clamp 3 .

[0045] Furthermore, the antenna 5 of the controller 4 is welded to the steel bar through a wire.

[0046] See also Figure 3 , a method for detecting chloride ions in concrete, comprising the following steps:

[0047] S1: Metal sheet processing: Use 400-grit sandpaper to grind the copper sheet 1 and the aluminum sheet 2 to make them smooth, and spray graphite on one side of the copper sheet 1 and the aluminum sheet 2, and let them dry for later use;

[0048] S2: According to the thickness of the copper sheet 1, the aluminum sheet 2 and the controller 4, polylactic acid is used as the raw material, a 3D printing fixture 3 is used, and the copper sheet 1, the aluminum sheet 2 and the controller 4 are clamped, the copper sheet 1 is connected to the positive electrode of the controller 4 with a wire, and the aluminum sheet 2 is connected to the negative electrode of the controller 4 with a wire. The positive and negative electrodes of the controller 4 are connected in parallel with a double-layer farad capacitor 7, and the Ag / AgCl chloride ion sensor 6 is welded to the controller 4 and connected to the analog-to-digital conversion interface of the controller 4 to complete the preparation of the concrete chloride ion sensor;

[0049] S3: Fix the prepared concrete chloride ion sensor to the steel bar of the part to be constructed, and weld the antenna 5 of the controller 4 to the steel bar. After the concrete is poured, the slurry flows between the copper sheet 1 and the aluminum sheet 2, and the concrete chloride ion sensor starts to work. Connect the signal interface to the steel bar to complete the data reading.

[0050] Furthermore, taking the preparation of concrete chloride ion sensor using ESP8266 as an example, the specific preparation method and detection method thereof include the following steps:

[0051] Metal sheet processing: Use 2*50*50mm copper sheet 1 as the positive electrode and 2*50*50mm aluminum sheet 2 as the negative electrode. Use 400-grit sandpaper to polish the copper sheet 1 and aluminum sheet 2 until they are smooth. Use graphite dry layer spray paint to spray graphite on one side of the copper sheet 1 and aluminum sheet 2 respectively, and let them dry for use.

[0052] 3D printing fixture 3: According to the thickness of copper sheet 1, aluminum sheet 2 and controller 4, polylactic acid is used as raw material to print fixture 3, and the controller 4, copper sheet 1 and aluminum sheet 2 are clamped;

[0053] The controller 4 uses ESP12E as the MCU and connects the Ag / AgCl chloride ion sensor 6 to the ADC port;

[0054] Connect the copper sheet 1 to the positive electrode (+) of the controller 4 with a wire, connect the aluminum sheet 2 to the negative electrode (-) of the controller 4 with a wire, and connect the positive and negative electrodes on the controller 4 with a 0.1F double-layer farad capacitor 7 in parallel;

[0055] Use sealing silicone to stick the fixture 3 into the steel bar, and use a soldering iron to connect the antenna 5 of the controller 4 to the steel bar with a wire;

[0056] After the concrete is poured, the slurry flows between the copper sheet 1 and the aluminum sheet 2, and current begins to be generated. The concrete chloride ion sensor starts to work, and another ESP8266 chip can be used to read the detection data from the steel bar connected to the antenna 5.

[0057] It should be noted that, for the above embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the order of the actions described, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the present application.

[0058] In addition, the terms "connected" and "set" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "connected" or "set" may explicitly or implicitly include one or more of the features. Moreover, the terms "connected", "set", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate so that the embodiments of the invention described herein can be implemented in an order other than those illustrated or described herein.

[0059] The above embodiments describe the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the changes and modifications made by those skilled in the art shall be within the scope of protection of the appended claims of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A concrete chloride ion sensor, characterized in that: It includes a detection mechanism, an energy supply mechanism and a controller, wherein the controller is connected to the detection mechanism and the energy supply mechanism respectively, the energy supply mechanism includes a metal sheet and an energy storage capacitor, the metal sheet as the positive and negative electrodes of the energy supply mechanism are connected to the controller and the energy storage capacitor respectively, the concrete chloride ion sensor is fixed on the steel bars of the component to be constructed, the poured slurry reacts with the metal sheet to supply energy to the concrete chloride ion sensor, and the controller transmits the detection data through the steel bars; The metal sheet is one or more of a magnesium sheet, a copper sheet, an aluminum sheet, a nickel sheet and an iron sheet; the metal sheet is connected in parallel with the energy storage capacitor; the controller uses a low-power MCU core board, and the MCU core board uses one of MSP430, TMS, STM32 and ESP8266; the controller is connected to the metal sheet through a fixture, and one side of the positive and negative metal sheets are coated with graphite; the antenna of the controller is welded to the steel bar through a wire.

2. A concrete chloride ion sensor as claimed in claim 1, characterized in that: The detection mechanism is an Ag / AgCl chloride ion sensor, and the Ag / AgCl chloride ion sensor is connected to a controller.

3. A concrete chloride ion sensor as claimed in claim 1, characterized in that: The metal sheet uses a copper sheet as the positive electrode of the energy supply mechanism, and the copper sheet is connected to the positive electrode of the controller through a wire; the metal sheet uses an aluminum sheet as the negative electrode of the energy supply mechanism, and the aluminum sheet is connected to the negative electrode of the controller through a wire.

4. A concrete chloride ion sensor as claimed in claim 3, characterized in that: One side of the copper sheet and the aluminum sheet is coated with graphite, and the sides coated with graphite are opposite to each other.

5. A method for detecting chloride ions in concrete, based on a concrete chloride ion sensor according to any one of claims 1 to 4, characterized in that: The steps include: S1: Metal sheet processing: Use 400-grit sandpaper to grind the copper sheet and aluminum sheet smooth, and spray graphite on one side of the copper sheet and aluminum sheet, and let them dry for later use; S2: According to the thickness of the copper sheet, aluminum sheet and controller, polylactic acid is used as the raw material, and a 3D-printed fixture is used to clamp the copper sheet, aluminum sheet and controller. The copper sheet is connected to the positive electrode of the controller with a wire, and the aluminum sheet is connected to the negative electrode of the controller with a wire. The positive and negative electrodes of the controller are connected in parallel with a double-layer Farad capacitor. The Ag / AgCl chloride ion sensor is welded to the controller and connected to the analog-to-digital conversion interface of the controller to complete the preparation of the concrete chloride ion sensor. S3: Fix the prepared concrete chloride ion sensor to the steel bar of the part to be constructed, and weld the antenna of the controller to the steel bar. After the concrete is poured, the slurry flows between the copper sheet and the aluminum sheet, and the concrete chloride ion sensor starts to work. Connect the signal interface to the steel bar to complete the data reading.

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