Water level detection piece based on ecological concrete as well as preparation method and application of water level detection piece

Abstract

The invention discloses a water level detection piece based on ecological concrete and a preparation method and application thereof. The problems that traditional water level monitoring is poor in reliability and low in accuracy are mainly solved. The water level detection piece is formed by correspondingly pouring ecological concrete doped with carbon fibers, through direct contact between the water level detection piece and the water body, when the height of the outside water body changes, stress borne by the water level detection piece also changes, the stress change can enable the resistance value of the water level detection piece to change, and the water level detection piece can be used for detecting the water level. And the water level information in one-to-one correspondence with the resistance value can be obtained by obtaining the resistance value of the water level detection piece. Due to the fact that the resistance value of the water level detection piece is only influenced by the stress change of the water level detection piece and is not interfered by signals such as an external magnetic field, the water level detection precision and reliability can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic structures, and particularly to a water level detection member based on ecological concrete, a preparation method thereof, and an application thereof. Background Art

[0002] Water level detection is the process of actually measuring the height of the water surface at a certain location of the water body from the standard reference plane. It is one of the basic items of hydrological surveys and is widely used in scenarios such as groundwater level monitoring, river water level monitoring, reservoir water level monitoring, and water tank water level monitoring. The main purpose of water level detection is to obtain water level height data of the water body at different times and different locations. These data are of great significance for the planning, design, construction, and management of water conservancy projects, as well as other engineering constructions such as waterways, bridges, shipyards, ports, water supply, and drainage. At the same time, water level detection is also an important basis for flood control and drought relief, water resource management, and water ecological protection.

[0003] The existing commonly used water level monitoring methods known to the inventors include float switch monitoring and capacitive water level sensor monitoring. Among them, float switch monitoring, as a mature and simple detection method, detects the change of liquid level through the rise and fall of the float. However, its repeat accuracy is poor and it is not suitable for liquids with impurities and viscous liquids, with relatively large limitations. Capacitive water level sensor monitoring, on the other hand, determines whether there is water shortage by sensing the capacitance value difference of the presence or absence of water in the water tank. Its limitation is that there cannot be any magnetic field or metal around the sensor during use, otherwise it will cause interference and affect the final detection accuracy and accuracy.

[0004] The information disclosed in this background art section is only used to deepen the understanding of the background art of the present disclosure, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present disclosure provides a water level detection member based on ecological concrete, a preparation method thereof, and an application thereof, mainly solving the problems of poor reliability and low accuracy of traditional water level monitoring.

[0006] According to one aspect of the present disclosure, there is provided a water level detection member based on ecological concrete, which includes a detection body formed by correspondingly casting a geopolymers doped with carbon fiber, and detection electrodes correspondingly electrically connected to the detection body and used to correspondingly apply current to the detection body and detect the change of the resistance of the detection body.

[0007] In some embodiments of the present disclosure, the detection electrodes are respectively fixed or embedded at both ends of the detection body.

[0008] According to another aspect of the present disclosure, there is provided a method for preparing the above water level detection member, which mainly includes the following steps: (1) Collect solid waste including blast furnace slag and fly ash, and remove impurities and harmful substances therein correspondingly; (2) After mixing the solid waste by mass percentage and in a ratio of 30% - 70% of fly ash and 30% - 70% of slag, add an activator accounting for 5% - 20% of the mass of the solid waste to initiate a geopolymerization reaction correspondingly and generate a corresponding geopolymer; (3) Incorporate carbon fiber accounting for 0.1% - 2.0% of the mass of the solid waste, and stir until the carbon fiber is uniformly mixed with the geopolymer; (4) Select an additive compatible with the geopolymer according to the performance requirements of the ecological concrete and uniformly mix it with the geopolymer; (5) Mix the geopolymer and the aggregate in a corresponding ratio, add water and stir until uniform, and pour it into a corresponding mold for curing and forming.

[0009] In some embodiments of the present disclosure, in the step (2), the curing temperature of the geopolymerization reaction is controlled to be 75 °C and the liquid-solid ratio is 0.33 mL / g correspondingly.

[0010] In some embodiments of the present disclosure, in the step (2), the activator is at least one of sodium hydroxide, sodium silicate, potassium hydroxide, and water glass.

[0011] In some embodiments of the present disclosure, in the step (4), the additive is a water reducing agent, a strengthening agent, or a waterproof agent.

[0012] According to another aspect of the present disclosure, there is provided a water level detection system, including the above water level detection member disposed at the bottom of the water area to be detected correspondingly, a power supply for supplying power to the water level detection member by being electrically connected to the detection electrode correspondingly, a control unit electrically connected to the detection electrode of the water level detection member through an analog-to-digital conversion unit correspondingly, and a data transmission module communicatively connected to the control unit and used for communicating with the cloud or a control terminal.

[0013] In some embodiments of the present disclosure, the water area to be detected is correspondingly divided into several regions, and the water level detection members are arranged at the bottom of at least one region, and each of the water level detection members is independent of each other.

[0014] In some embodiments of the present disclosure, the control unit includes a single-chip microcomputer, and the analog-to-digital converter is electrically connected between the input pin of the single-chip microcomputer and the detection electrode correspondingly.

[0015] In some embodiments of the present disclosure, the supply voltage of the power supply is less than 30V.

[0016] One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages: 1. The water level detection component is formed by corresponding casting of ecological concrete doped with carbon fiber. Through the direct contact between the water level detection component and the water body, when the height of the external water body changes, the stress received by the water level detection component also changes accordingly. This stress change can cause the resistance value of the water level detection component to change. Furthermore, by obtaining the resistance value of the water level detection component, water level information corresponding to this resistance value can be obtained. Since the resistance value of the water level detection component is only affected by its own stress change and is not interfered by signals such as external magnetic fields, the water level detection accuracy and reliability can be effectively improved.

[0017] 2. Using industrial solid waste as the matrix material of the water level detection component can effectively reduce the production cost of the water level detection component and reduce its adverse impact on the environment during the production process. At the same time, by doping carbon fiber into geopolymers, while achieving the water level detection effect, the structural strength of the water level detection component can be enhanced, and the service life of the water level detection component can be improved. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the test layout of the water level detection system in an embodiment of the present application.

[0019] Figure 2 It is the test result of the water level detection system in an embodiment of the present application.

[0020] In the above figure, 1 is a hydraulic model, 2 is a water level detection component, and 3 is a detection circuit. Detailed Embodiments

[0021] In the description of the present application, it should be understood that the orientation or positional relationships indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. And the "connection" and "coupling" involved in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0022] The programs involved or relied on in the following embodiments are all conventional programs or simple programs in the technical field. Those skilled in the art can make conventional selections or adaptive adjustments according to specific application scenarios.

[0023] To better understand the technical solution of this application, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0024] To solve the technical problems of poor reliability and low accuracy in the existing water level detection technology, this example discloses a water level detection component based on ecological concrete to achieve accurate and reliable water level detection. It includes a detection body, which is formed by pouring a geopolymer doped with carbon fiber in a corresponding mold. While strengthening the structural strength of the detection body through the carbon fiber, the conductivity of the carbon fiber is utilized to realize the detection of the water level height. Specifically, at different water level heights, the acting force of the water body pressure on the detection body is different, and this stress difference will cause the resistance value of the carbon fiber doped in the detection body to change. Thus, by detecting the resistance value of the detection body and according to a specific corresponding curve, the water level height corresponding to different resistance values of the detection body can be obtained, so as to achieve the purpose of water level monitoring.

[0025] Among them, in this embodiment, the detection body has a disc-shaped structure with a thickness of 50 mm. Thus, the contact area between the detection body and the water body is increased through the disc-shaped structure, thereby improving the ability of the detection body to sense the water body pressure and ensuring the reliability of the detection result; on the other hand, the disc-shaped detection body is convenient to be arranged at the bottom of the water area to be detected, which is beneficial to convenient construction.

[0026] Furthermore, under the pressure action of different water levels, the resistance value strain of the detection body is different. To supply power to the detection body and conveniently obtain the change in the resistance value, in this example, detection electrodes are respectively arranged at both ends of the detection body, and the detection body is correspondingly electrically connected to the detection circuit through the detection electrodes. Among them, a power supply and an output port for electrically connecting to the control unit are connected in series in the detection circuit. Thus, power is supplied to the detection body through the power supply, and the change in the resistance of the detection body is obtained by outputting the voltage change from the output port. Specifically, when the detection body is affected by the corresponding water body pressure, the resistance value of the detection body itself changes under the action of the water pressure, causing the current flowing through the detection body to change accordingly. Thus, by capturing and detecting this current through the detection electrodes, the voltage change of the output port in the detection circuit is affected, and then the resistance value change information of the detection body is obtained from the voltage change of the output port, and according to the resistance-water level curve, the water level information corresponding to the corresponding resistance value, that is, the detection result of the detection body, is obtained.

[0027] In addition, to avoid the problem that the setting of the electrodes affects the force on the detection body and further affects the accuracy and reliability of the detection results, in this embodiment, copper sheets are respectively used as the detection electrodes, and are respectively fixed to the end sides of the detection body after the detection body is cast and formed. In some other embodiments, the detection electrodes are embedded in the detection body during the casting of the detection body. In addition, in some other embodiments, considering the material difference between the electrodes and the detection body, in order to ensure the firm embedding of the electrodes in the detection body, the detection electrodes adopt a mesh structure, thereby enhancing the embedding strength of the electrodes and simultaneously increasing the structural strength of the detection body as the internal ribs of the detection body.

[0028] This example also discloses a preparation method of the above water level detection component, including the following steps: (1) Collect solid wastes including blast furnace slag and fly ash, and remove impurities and harmful substances therein correspondingly.

[0029] Considering the problems that a large amount of pollution is generated during the production process of traditional concrete materials, and their performance deteriorates rapidly and their service life is short in harsh environments such as humidity and corrosion, in this embodiment, solid wastes such as blast furnace slag and fly ash are used as raw materials to form high-performance ecological concrete through geopolymerization reaction, realizing the reuse of waste while reducing the consumption of natural resources and reducing the environmental cost caused by waste treatment. Compared with traditional concrete materials, geopolymers mainly composed of blast furnace slag and fly ash have lower energy consumption during the production process and can effectively avoid the generation of a large amount of greenhouse gases such as carbon dioxide.

[0030] After collecting the blast furnace slag and fly ash solid wastes, first remove impurities such as soil and sand in the solid wastes to avoid affecting the reaction process of the subsequent geopolymerization reaction and the performance of the produced geopolymer; in addition, in this example, harmful substances including heavy metals and organic matters in the solid wastes are further removed to avoid adverse effects of the harmful substances on the environment and the performance of the concrete.

[0031] (2) Mix the solid wastes by mass percentage, and mix them in a ratio of 30% - 70% of fly ash and 30% - 70% of slag, and then add an activator accounting for 5% - 20% of the mass of the solid wastes to correspondingly initiate the geopolymerization reaction and generate the corresponding geopolymer.

[0032] After the collected solid waste is treated for impurities and harmful substances as described in step (1), the treated raw materials are mixed in a specific ratio. In this embodiment, fly ash and slag are mixed in a mass percentage, wherein fly ash accounts for 30% to 70%, slag accounts for 30% to 70%, and the sum of the two is 100%. After the raw materials are mixed in this ratio, a chemical stimulant is added to initiate the geopolymerization reaction. In this embodiment, the chemical stimulant is sodium silicate; in some other embodiments, the stimulant is any one of sodium hydroxide, potassium hydroxide, and water glass. And in terms of mass percentage, the amount of stimulant accounts for 5% to 20% of the mass of the solid waste, and the water-binder ratio is in the range of 0.3 to 0.5. In order to ensure the reaction rate and output effect of the geopolymerization reaction, the curing temperature of the geopolymerization reaction is controlled to be 75°C and the liquid-solid ratio is 0.33mL / g. In addition, in this embodiment, the amount of rare earth waste slag in the geopolymerization reaction is also controlled to be 5% in terms of mass percentage, thereby obtaining a geopolymer with high compressive strength. According to the test, the compressive strength of the geopolymer produced by the above ratio and conditions can reach 30.47MPa, and the cumulative leaching concentrations of Th and U in the 7d toxic leachate are both lower than 0.1μg / L, which can be used in water level detection scenarios to avoid water pollution.

[0033] (3) Add carbon fiber in an amount of 0.1% to 2.0% of the mass of the solid waste and stir until the carbon fiber and the geopolymer are evenly mixed.

[0034] However, the inventors have found through research and experiments that the tensile strength of the above-mentioned geopolymer is relatively low, and it is weak when subjected to tensile force, prone to cracks or even fractures, and difficult to withstand large tensile stress; and the flexibility is insufficient, it is difficult to adapt to deformation when subjected to force, and brittle failure is prone to occur, which reduces the reliability and durability of the material. In order to improve the structural performance of the water level detection component based on the above-mentioned geopolymer reaction product and extend its service life. In this embodiment, a certain amount of carbon fiber is correspondingly doped into the above-mentioned geopolymer. The addition of carbon fiber overcomes the problem of low tensile strength of geopolymer, so that it can withstand greater tensile force, and can effectively improve the overall strength of the above-mentioned geopolymer. At the same time, it can also improve the shortcomings of insufficient deformation capacity of geopolymer, increase the flexibility of the material, so that it can better adapt to deformation when subjected to force, and reduce the risk of brittle failure. The most important thing is that the conductive properties of carbon fiber can be used to transmit electrical signals. When the external water level changes, water bodies at different heights will produce different degrees of stress on the geopolymer doped with carbon fiber. The stress change will cause the resistance value of the carbon fiber in the geopolymer to change, and then the geopolymer will present different output electrical signals accordingly. By monitoring the electrical signal and matching it with the water level according to the corresponding curve, the purpose of water level detection can be achieved.

[0035] Specifically, in this embodiment, carbon fibers with a mass percentage of 0.1% to 2.0% of the mass of the solid waste are doped into the geopolymer. Mechanical stirring and other methods are used to ensure the uniform mixing of the carbon fibers and the geopolymer, so that the carbon fibers are fully dispersed in the geopolymer, thereby improving the overall performance and uniformity of the material, and helping to improve the subsequent detection accuracy and reliability.

[0036] (4) Select a water reducer or a strength enhancer or a waterproof agent compatible with the geopolymer according to the performance requirements of the ecological concrete, and uniformly mix it with the geopolymer.

[0037] (5) Mix the geopolymer and the aggregate in a corresponding ratio, add water and stir until uniform, and then pour it into the corresponding mold for curing.

[0038] After adding additives to the geopolymer doped with carbon fibers, mix them in a ratio of 20% to 40% for the carbon fiber geopolymer and 60% to 80% for the aggregate by mass percentage, and then add water and stir well until uniform to avoid caking. After the stirring is completed, pour the ecological concrete into the pre-made mold and place it in a specific environment for curing. In this example, natural curing is adopted, and it is cured for 28 days at 27°C. In some other embodiments, steam curing is adopted. After the curing is completed and the mold is removed, the above-mentioned water level monitoring component can be obtained.

[0039] Among them, in the embodiment where the detection electrode is embedded in the detection body, when pouring the ecological concrete into the mold, insert the electrode plate connected with the wire into the corresponding position of the mold and fix it to avoid the problem of dislocation due to the pressure of the ecological concrete during pouring.

[0040] In addition, this example also discloses a water level detection system to achieve accurate and convenient detection of the water level position. Specifically, the water level detection system includes the above-mentioned water level detection component. Among them, the water level detection component is pre-cast at the bottom of the water area to be detected, and the normal direction of the water level detection component is perpendicular to the water surface to ensure that the water level detection component can fully and accurately sense the water pressure at different water levels and reduce the detection error caused by the inclined layout of the water level detection component. In some other embodiments, the detection body is pre-cast and then sunk to the bottom of a relatively flat water area.

[0041] In addition, the water level detection system further includes a power supply that is electrically connected to the detection electrodes of the water level detection component through a power supply wire. A voltage is applied to both ends of the water level detection component through the power supply and the detection electrodes to facilitate obtaining the resistance change of the water level detection component. In this embodiment, the voltage of the power supply is 30V, which is within the range of the safe voltage for the human body and meets the safety requirements for use. In this embodiment, to improve the detection accuracy, the area to be detected is divided into multiple water areas. To avoid detection errors caused by differences in the water bodies of the water areas, the above-mentioned water level detection components are respectively arranged at the bottom of different water areas, and each water level detection component is independent of each other. Thus, by obtaining the water level information of multiple water areas, the richness of the water level information data of the water areas is improved. Then, after considering the bottom elevation and eliminating the elevation differences of each detection data, the corresponding mean value processing is performed to obtain relatively accurate water level data based on a given horizontal plane.

[0042] In this embodiment, the water level detection system further includes a control unit for data processing. Specifically, in this example, the control unit is a single-chip microcomputer. By obtaining the electrical signal output by the detection electrodes at the water level detection component and based on the resistance-water level comparison curve, the water level height information corresponding to the electrical signal is obtained. Among them, the electrical signal output by the detection electrodes is an analog signal and cannot be recognized by the single-chip microcomputer. Therefore, in this embodiment, an analog-to-digital converter is arranged between the input pin of the single-chip microcomputer and the detection electrodes to convert the analog signal output by the detection electrodes into a digital signal recognizable by the single-chip microcomputer. And a voltage dividing circuit is also arranged between the detection electrodes and the analog-to-digital converter to reduce the voltage to a range compatible with the input voltage range of the analog-to-digital converter. For the detection scenario where multiple water level detection components are arranged, each water level detection component is respectively connected to different input pins of the single-chip microcomputer, and data transmission is performed independently, and the single-chip microcomputer centrally processes the data.

[0043] In this embodiment, a data transmission module is also communicatively connected to the output pin of the single-chip microcomputer. Thus, wireless communication with the cloud or terminal devices (such as mobile phones) is realized through the data transmission module. Specifically, in this example, the data transmission module is a WiFi communication module, which can realize long-distance communication connection with terminal devices, thereby facilitating obtaining the current detection data. In some other embodiments, the data transmission module is a 4G communication module.

[0044] In some other embodiments, considering that the water area to be detected is far from the shore and the line loss of the long-distance laid power supply line is serious, for this reason, in this example, the water level detection system further includes a solar power supply module, which specifically includes a solar panel floating on the water surface through a floating body, and also includes a storage battery electrically connected to the solar panel and arranged at the floating body. The storage battery is coated with a waterproof layer. Thus, the storage of surplus electric energy is realized through the storage battery, thereby ensuring the normal power supply of the detection system.

[0045] To verify the detection effect of the above water level detection system, seeFigure 1 , in this example, an experiment is conducted on the water level detection system. A water level detection component 2 is fixedly arranged at the bottom of the hydraulic model 1, and the detection electrodes of the water level detection component 2 are electrically connected to a detection circuit. A power supply and a detection circuit 3 including a control unit and an analog-to-digital converter are provided in the detection circuit. Then, water is gradually injected into the hydraulic model, and then the output signal of the water level detection component is obtained. Among them, the simulation diagrams of the water level heights before and after water injection are shown in Figure 2 , it can be found that after water injection, the water level detection system can accurately detect the change of the water level pressure, so as to effectively monitor the water level height.

[0046] Although some preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0047] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of its inventive concept. Thus, if these modifications and variations to the present invention fall within the scope of the claims of this application and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A water level detection component based on ecological concrete, characterized in that It includes a detection body formed by correspondingly casting a geopolymer doped with carbon fiber, and detection electrodes that are correspondingly electrically connected to the detection body and are used to correspondingly apply current to the detection body and detect the change in the resistance of the detection body.

2. The water level detection element according to claim 1, wherein The detection electrodes are respectively fixed or embedded at both ends of the detection body.

3. The preparation method of the water level detection component according to claim 1, characterized in that, It includes the following steps: (1) Collect solid wastes including blast furnace slag and fly ash, and correspondingly remove impurities and harmful substances therein; (2) After mixing the solid wastes by mass percentage and in a ratio of 30% - 70% of fly ash and 30% - 70% of slag, add an activator accounting for 5% - 20% of the mass of the solid wastes to correspondingly initiate a geopolymerization reaction and generate a corresponding geopolymer; (3) Incorporate carbon fiber accounting for 0.1% - 2.0% of the mass of the solid wastes, and stir until the carbon fiber is uniformly mixed with the geopolymer; (4) Correspondingly select an additive compatible with the geopolymer according to the performance requirements of ecological concrete and uniformly mix it with the geopolymer; (5) Mix the geopolymer and aggregate in a corresponding ratio, add water and stir until uniform, and pour it into a corresponding mold for curing and forming.

4. The preparation method according to claim 3, characterized in that, In the step (2), the curing temperature of the geopolymerization reaction is correspondingly controlled at 75°C and the liquid-solid ratio is 0.33 mL / g.

5. The preparation method according to claim 3, characterized in that, In the step (2), the activator is at least one of sodium hydroxide, sodium silicate, potassium hydroxide, and water glass.

6. The preparation method according to claim 3, wherein In the step (4), the additive is a water reducing agent, a strengthening agent, or a waterproof agent.

7. A water level detection system, characterized in that, It includes a water level detection component as described in claim 1 and correspondingly arranged at the bottom of the water area to be detected, a power supply for supplying power to the detection electrode correspondingly electrically connected to the detection electrode, a control unit correspondingly electrically connected to the detection electrode of the water level detection component through an analog-to-digital conversion unit, and a data transmission module communicatively connected to the control unit and used for communicating with the cloud or a control terminal.

8. The water level detection system according to claim 7, characterized in that, Divide the water area to be detected into several regions, lay the water level detection components at the bottom of at least one region, and each of the water level detection components is independent of each other.

9. The water level detection system according to claim 7, wherein The control unit includes a single-chip microcomputer, and the analog-to-digital converter is correspondingly electrically connected between the input pin of the single-chip microcomputer and the detection electrode.

10. The water level detection system according to claim 7, wherein The supply voltage of the power supply is less than 30V.

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