Durability monitoring system and monitoring method for reinforced concrete structure

Abstract

A durability monitoring system and monitoring method for a reinforced concrete structure, facilitating comprehensive and accurate monitoring of the durability of a reinforced concrete structure. The durability monitoring system for a reinforced concrete structure comprises: a monitoring sensor (10) arranged inside a reinforced concrete structure and used for respectively acquiring durability parameters reflecting the degree of corrosion of the reinforced concrete structure; a data acquisition and transmission module used for acquiring the durability parameters, performing signal processing on the durability parameters, and transmitting a signal obtained after the processing and carrying the durability parameters; a data analysis module receiving and parsing the transmitted signal carrying the durability parameters, and evaluating the degree of durability of the reinforced concrete structure on the basis of data analysis; and a durability diagnosis module used for determining the durability of the reinforced concrete structure on the basis of the evaluation and analysis result of the degree of durability. The monitoring system is applicable to a concrete durability monitoring scenario.

Description

A durability monitoring system and method for reinforced concrete structures

[0001] Cross-references to related applications

[0002] This application claims the benefit of Chinese patent application CN202411841057.4, filed on December 13, 2024, the contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of corrosion protection engineering, and in particular to a durability monitoring system and method for reinforced concrete structures. Background Technology

[0004] In the field of corrosion protection engineering, especially for the durability monitoring of reinforced concrete structures, existing technologies and equipment still have many shortcomings. For public infrastructure such as bridges and dams, which are expensive and have a service life of several decades, their reliability and safety are crucial to society and the economy. If these structures fail prematurely due to steel corrosion, it will lead to huge economic losses and potential dangers to life. Therefore, there is an urgent need for a non-destructive monitoring system that can monitor and provide early warning of the durability of steel bars in real time.

[0005] Currently, non-destructive testing technologies are widely used in reinforced concrete structures, including electromagnetic, eddy current, ultrasonic, and infrared technologies. These technologies assess the corrosion status of internal steel bars by monitoring changes in the physical properties of concrete. However, steel corrosion is essentially an electrochemical process, so corrosion electrochemical detection technology has a significant advantage in obtaining early corrosion information. Summary of the Invention

[0006] In view of this, the present invention aims to provide a durability monitoring system and method for reinforced concrete structures, which facilitates comprehensive and accurate monitoring of the durability of reinforced concrete structures.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, embodiments of the present invention provide a durability monitoring system for reinforced concrete structures, comprising: monitoring sensors, deployed inside the reinforced concrete structure, for collecting durability parameters reflecting the degree of corrosion of the reinforced concrete structure; the durability parameters include: half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature, and humidity data; a data acquisition and transmission module, for collecting the durability parameters, processing the durability parameters, and transmitting the processed signals carrying the durability parameters; a data analysis module, for receiving and analyzing the transmitted signals carrying the durability parameters, and analyzing and evaluating the durability degree of the reinforced concrete structure based on the half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature, and humidity data; and a durability diagnosis module, for determining the durability of the reinforced concrete structure based on the durability degree evaluation and analysis results.

[0009] Optionally, the data analysis module is specifically used for: assessing the risk of steel corrosion based on the half-cell potential data; determining the resistivity change of concrete based on resistivity data; monitoring changes in the internal environmental state of concrete using chloride ion concentration, pH value, temperature, and humidity data; and assessing the corrosion rate of steel under actual working conditions using corrosion rate data.

[0010] Optionally, the monitoring sensor includes: a sensor compartment, a first circuit compartment, and a second circuit compartment. The sensor compartment is located above the first circuit compartment, and the first circuit compartment is located above the second circuit compartment. The sensor compartment is connected to the first circuit compartment, and the first circuit compartment is connected to the second circuit compartment. It is used to house circuit boards and run cables. The sensor compartment contains an ER resistance probe, a resistivity electrode, a pH electrode, a chloride ion selective electrode, a long-life graphite electrode, and a steel working electrode. The monitoring electrodes are installed longitudinally and parallel in the sensor compartment and are potted together. The data acquisition and transmission module is arranged in the first and second circuit compartments. The data acquisition and transmission module includes: a signal processing circuit and a data transmission circuit. One end of the signal processing circuit is connected to each electrode in the sensor compartment, and the other end of the signal processing circuit is connected to the data transmission circuit. The output end of the data transmission circuit and the power supply port of the circuit are led out to the outside of the first circuit compartment through cables and potted.

[0011] Optionally, when the monitoring sensors are installed inside a reinforced concrete structure, each monitoring electrode is in contact with the concrete, and the long-lasting graphite electrode serves as a reference electrode. The chloride ion concentration is collected by: a chemical reaction between the chloride ion selective electrode and chloride ions in the concrete, causing a change in the potential of the chloride ion selective electrode while the potential of the reference electrode remains unchanged; the chloride ion selective electrode is an Ag / AgCl electrode rod; the potential between the chloride ion selective electrode and the reference electrode is measured.

[0012] According to the formula: Potential = Slope * lg[Cl] - The chloride ion concentration in the concrete structure is calculated using the intercept.

[0013] The pH electrode is an IrO2 / Ti electrode rod, with its probe end in contact with concrete. The pH value is acquired by measuring the potential between the pH electrode and the reference electrode.

[0014] The pH value inside the concrete structure can be calculated using the formula: Potential = Slope * pH + Intercept.

[0015] Optionally, the resistivity electrode comprises two 316 stainless steel rods arranged in parallel and spaced apart. The resistivity electrode has a length of 50-120 mm, a diameter of 4-20 mm, and a distance of 20-40 mm between the two resistivity electrodes.

[0016] Optionally, the reinforcing steel working electrode is embedded in concrete, and the half-cell potential is obtained by measuring the potential difference between the graphite reference electrode and the reinforcing steel working electrode; after the measuring sensor is installed, the sensor is fully wrapped with concrete from the construction site to ensure that the sensor accurately acquires data.

[0017] Optionally, the ER resistance probe is used to measure the resistance change on the surface of a metal test piece made of the same material as the steel reinforcement in the field, and the corrosion rate of the steel reinforcement inside the reinforced concrete structure is calculated based on the measured resistance value.

[0018] Optionally, assessing the corrosion risk of reinforcing steel based on the half-cell potential data includes: comparing the half-cell potential with different levels of reinforcing steel corrosion potential thresholds to determine the degree of corrosion; diagnosing the resistivity change of concrete based on resistivity data includes: comparing the resistivity with different levels of concrete resistivity thresholds to determine the degree of corrosion, wherein there is a corresponding relationship between different levels of concrete resistivity thresholds and the degree of reinforcing steel corrosion; monitoring the erosion environment within the concrete using chloride ion concentration, pH value, temperature, and humidity data includes: comparing the chloride ion concentration with the chloride ion content threshold in the concrete to monitor whether the reinforcing steel in the concrete has a tendency to corrode; simultaneously, monitoring the change in pH value inside the reinforced concrete structure, determining the pH threshold range corresponding to the passivation film state on the surface of the reinforcing steel at the pH value, determining the erosion environment state of the reinforcing steel based on the pH threshold range, with a lower pH value indicating a higher corrosion risk; and using the temperature and humidity to assist in determining the erosion environment state of the reinforcing steel.

[0019] Optionally, the monitoring system further includes an early warning module and a display module. The early warning module is used to receive the durability of the reinforced concrete structure determined by the durability diagnosis module and issue early warning information for monitoring points with abnormal problems. The display module is used to display the durability diagnosis results of the reinforced concrete structure and provide users with data query and historical trend analysis controls.

[0020] Secondly, embodiments of the present invention also provide a method for monitoring the durability of reinforced concrete structures.

[0021] Monitoring sensors are deployed inside the reinforced concrete structure to collect durability parameters that reflect the durability of the reinforced concrete structure. These durability parameters include half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature, and humidity data.

[0022] The data acquisition and transmission module is used to acquire durability parameters, perform signal processing on the durability parameters, and transmit the processed signal carrying the durability parameters.

[0023] The data analysis module then receives and analyzes the transmitted signals carrying durability parameters, and evaluates the durability of the reinforced concrete structure based on data such as half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity.

[0024] Finally, the durability of the reinforced concrete structure was determined by evaluating the degree of change in the internal durability parameters of the concrete.

[0025] This invention provides a durability monitoring system and method for reinforced concrete structures. Monitoring sensors are deployed inside the reinforced concrete structure to collect durability parameters reflecting its durability level. A data acquisition and transmission module processes the collected durability parameters and transmits the processed signals carrying these parameters. A data analysis module receives and analyzes the signals carrying the durability parameters to assess the durability level of the reinforced concrete structure. Finally, a durability diagnosis module determines the durability of the reinforced concrete structure based on the durability assessment results. The data is automatically uploaded to a cloud server for viewing on computers and mobile devices. By collecting multiple durability parameters from inside the reinforced concrete structure, such as pH and Cl-, the system can monitor the durability of the concrete. - It can monitor concentration and changes in resistivity and corrosion rate in concrete, and characterize the durability of reinforced concrete structures based on multiple durability parameters, making it easy to achieve comprehensive and accurate monitoring of durability changes in reinforced concrete structures. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 is a schematic diagram of the monitoring sensor structure in a durability monitoring system for reinforced concrete structures according to an embodiment of the present invention.

[0028] Figure 2 is a top view of the monitoring sensor in the durability monitoring system of reinforced concrete structure according to an embodiment of the present invention;

[0029] Figure 3 is a schematic flowchart of a durability monitoring method for reinforced concrete structures according to an embodiment of the present invention. Detailed Implementation

[0030] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0031] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] Referring to Figure 1, the durability monitoring system for reinforced concrete structures provided in this embodiment includes: monitoring sensors 10, deployed inside the reinforced concrete structure, used to collect durability parameters reflecting the degree of corrosion of the reinforced concrete structure; the durability parameters include: half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature, and humidity data; a data acquisition and transmission module, used to collect durability parameters, perform signal processing on the durability parameters, and transmit the processed signals carrying the durability parameters; a data analysis module, used to receive and analyze the transmitted signals carrying the durability parameters, and analyze and evaluate the durability degree of the reinforced concrete structure based on the half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature, and humidity data; and a durability diagnosis module, used to determine the durability of the reinforced concrete structure based on the durability degree evaluation and analysis results.

[0033] The durability monitoring system for reinforced concrete structures provided in this invention deploys monitoring sensors inside the reinforced concrete structure to collect durability parameters reflecting the durability level of the structure. A data acquisition and transmission module processes the collected durability parameters and transmits the processed signals carrying these parameters. Next, a data analysis module receives and analyzes the signals carrying the durability parameters to assess the durability level of the reinforced concrete structure. Finally, a durability diagnosis module determines the durability of the reinforced concrete structure based on the durability assessment analysis results. The data is then automatically uploaded to a cloud server for viewing on computers and mobile devices. By collecting multiple durability parameters from inside the reinforced concrete structure, such as pH and Cl-, the system can effectively monitor the durability of the concrete. - It can monitor concentration and changes in resistivity and corrosion rate in concrete, and characterize the durability of reinforced concrete structures based on multiple durability parameters, making it easy to achieve comprehensive and accurate monitoring of durability changes in reinforced concrete structures.

[0034] More specifically, this invention collects multiple durability parameters from within reinforced concrete structures, such as the pH value and Cl- content in the concrete. - Concentration monitoring can also monitor the state of steel bars and corrosion rate in concrete. Based on multiple durability parameters, it can characterize the durability of reinforced concrete structures, making it easy to achieve comprehensive and accurate monitoring of the durability of reinforced concrete structures.

[0035] In some embodiments, the data analysis module is specifically used for: assessing the risk of steel corrosion based on half-cell potential data; determining the resistivity change of concrete based on resistivity data; monitoring changes in the internal environmental state of concrete using chloride ion concentration, pH value, temperature and humidity data; and assessing the corrosion rate of steel under actual working conditions using corrosion rate data.

[0036] It should be understood that the durability of reinforced concrete structures is affected by pH and Cl. - The interaction of factors such as temperature and humidity leads to a decrease in pH and Cl. - Increased concentration, temperature, and humidity can all lead to corrosion of the internal steel reinforcement, thereby affecting the overall durability of the structure.

[0037] Referring to Figures 1 and 2, in some embodiments, the monitoring sensor 10 includes: a sensor compartment 101, a first circuit compartment 102, and a second circuit compartment 103. The sensor compartment 101 is located above the first circuit compartment 102, and the first circuit compartment 102 is located above the second circuit compartment 103. The sensor compartment 101 is connected to the first circuit compartment 102, and the first circuit compartment 102 is connected to the second circuit compartment 103. It is used to house circuit board components and run cables. The sensor compartment 101 contains an ER resistance probe 104, a resistivity electrode 105, a pH electrode 106, a chloride ion selective electrode 107, a long-life graphite electrode 108, and a steel rebar working electrode 109. Each electrode is longitudinally parallel within the sensor compartment 101 and is encapsulated with other electrodes. The first circuit compartment 102 is equipped with a data acquisition and transmission module. The data acquisition and transmission module includes a signal processing circuit 111 and a data transmission circuit 112. One end of the signal processing circuit is connected to each electrode in the sensor compartment 101, and the other end of the signal processing circuit 111 is connected to the data transmission circuit 112. The output terminal of the data transmission circuit 112 and the power supply port of the circuit are led out to the outside of the first circuit compartment 102 through a cable and then potted. The sensor compartment 101, the first circuit compartment 102 and the second circuit compartment 103 are arranged from top to bottom to facilitate the overall packaging and debugging of the equipment. At the same time, the sensor compartment 101 adopts an integrated design, which can integrate different sensors and increase the capacity of the sensor compartment. In addition, in order to ensure waterproofness, the parts of the compartment that come into contact with the external environment are designed to be waterproof and corrosion resistant, ensuring that the overall sealing can meet the requirements of the field use environment.

[0038] Referring to Figure 1, in some embodiments, when the monitoring sensor 10 is installed inside a reinforced concrete structure, each monitoring electrode is in contact with the concrete, and the long-lasting graphite electrode serves as the reference electrode. The chloride ion concentration is collected by: a chemical reaction between the chloride ion selective electrode and chloride ions in the concrete, causing a change in the potential of the chloride ion selective electrode, while the potential of the reference electrode remains unchanged; the chloride ion selective electrode is an Ag / AgCl electrode rod; the potential between the chloride ion selective electrode and the reference electrode is measured; according to the formula:

[0039] Potential = Slope * lg[Cl] - The chloride ion concentration in the concrete structure is calculated using the intercept.

[0040] The pH electrode is an IrO2 / Ti electrode rod, with its probe end in contact with concrete. The pH value is acquired by measuring the potential between the pH electrode and the reference electrode, according to the formula:

[0041] Potential = Slope * pH + Intercept; The pH value inside the concrete structure is calculated.

[0042] The chloride ion content refers to the sum of chloride ion content in various raw materials in concrete, expressed as its weight ratio to cementitious materials. The initial pH value of the hydrated concrete is ≥12.6, which produces a dense passivation film on the surface of the steel reinforcement. When chloride ions enter the concrete and reach the surface of the steel reinforcement, the passivation film begins to be locally damaged. When the pH value drops to around 11.5, the passivation film becomes unstable. When the pH value drops to the range of 9-10, the function of the passivation film is completely destroyed, and the steel reinforcement is in a depassivated state, which is very likely to cause corrosion. When the concrete undergoes carbonation and corrosion, its pH value can drop below 9, and the corrosion protection of the steel reinforcement cannot be guaranteed, which promotes the destruction of the passivation film on the surface of the steel reinforcement.

[0043] Referring to Figure 2, in some embodiments, the resistivity electrode 105 includes two parallel and spaced 316 stainless steel rods. The resistivity electrode has a length of 50-120 mm, a diameter of 4-20 mm, and a distance of 20-40 mm between the two resistivity electrodes. The concrete resistivity is the output voltage / output current. When the concrete resistivity is greater than 100 KΩ·cm, the reinforcing steel will not corrode. When the concrete resistivity is in the range of 50-100 KΩ·cm, the reinforcing steel will corrode, but the corrosion rate is relatively slow. When the concrete resistivity is in the range of 10-50 KΩ·cm, the corrosion rate of the reinforcing steel can be medium to high. Furthermore, the parallel and spaced 316 stainless steel rods in the resistivity electrode reduce the volume occupied by the resistivity electrode.

[0044] Referring to Figure 2, in some embodiments, the reinforcing bar working electrode 109 is embedded in concrete, and the half-cell potential is obtained by measuring the potential difference between the graphite reference electrode and the reinforcing bar working electrode 109. After the measuring sensor is installed, the sensor chamber 101 is fully wrapped with concrete from the construction site to ensure that the sensor accurately obtains data. The reinforcing bar working electrode 109 is divided into an anode region and a cathode region. The reinforcing bar electrode is the anode region, which is the activation region, and the cathode region is the passivation region. The activation region and the passivation region of the reinforcing bar in the concrete show different corrosion potentials. When the reinforcing bar is passivated, the corrosion potential increases and the potential is positive. When the reinforcing bar changes from the passivation state to the activation state, the corrosion potential decreases and the potential is negative.

[0045] In some existing technologies, sensors based on the principle of corrosion electrochemistry can effectively monitor reinforced concrete structures. For example, invention patent CN101706408A discloses a reinforced concrete embedded corrosion sensor, which is also a type of embedded corrosion sensor for reinforced concrete. This sensor has four pairs of corrosion couplers, a hollow rod, a base, and connecting wires. Installed in the concrete before pouring, it can monitor the reinforced concrete structure from an early stage for long-term monitoring. However, these sensors are all based on the principle of galvanic corrosion. They set up anode and cathode couplers in the sensor, and measure the corrosion data of the couplers according to the different degrees of concrete erosion to determine the degree of concrete deterioration. However, this kind of steel corrosion monitoring sensor based on the principle of macroscopic galvanic cells monitors the galvanic corrosion current between the anode and the inert cathode, rather than directly measuring the corrosion rate of the steel reinforcement.

[0046] In addition, some existing technologies mainly assess the corrosion rate of steel bars by measuring the corrosion current density. For example, by monitoring the resistivity of concrete, the system resistance is compensated during the monitoring of the corrosion current density of steel bars to obtain a more accurate monitoring rate of steel bar corrosion.

[0047] Referring to Figure 2, in some embodiments, the ER resistance probe 104 is used to measure the resistance change of a metal specimen of the same material as the steel reinforcement in the field inside the probe. The corrosion rate of the steel reinforcement inside the reinforced concrete structure is calculated based on the measured resistance value. The ER corrosion rate is determined by the remaining thickness ratio, which is the voltage of the non-corrosion probe / the voltage of the corrosion probe. The working principle of the ER corrosion rate measuring probe is based on the relationship between the resistance and conductivity of the corrosive substance. When the metal surface corrodes, the corrosive substance causes a change in the resistance of the metal surface, which in turn affects the resistance value of the probe. By measuring the resistance change of the probe, the corrosion rate of the metal can be calculated.

[0048] In this embodiment, compared with the existing testing methods for steel corrosion, the corrosion rate of steel can be directly measured by setting the ER resistance probe 104, and the corrosion rate measurement is more stable than that of the three-electrode system.

[0049] In some embodiments, assessing the risk of steel reinforcement corrosion based on half-cell potential data includes: comparing the half-cell potential with different steel reinforcement corrosion potential thresholds to determine the degree of steel reinforcement corrosion; judging the resistivity change of concrete based on resistivity data includes: comparing the resistivity with different concrete resistivity thresholds to determine the degree of steel reinforcement corrosion; wherein there is a corresponding relationship between different concrete resistivity thresholds and the degree of steel reinforcement corrosion; monitoring the erosion environment inside the concrete using chloride ion concentration, pH value, temperature, and humidity data includes: comparing the chloride ion concentration with the chloride ion content threshold in the concrete to monitor whether the steel reinforcement inside the concrete has a tendency to corrode; simultaneously, monitoring the change of pH value inside the reinforced concrete structure, determining the pH threshold range corresponding to the passivation film state on the steel reinforcement surface at the pH value, determining the erosion environment state of the steel reinforcement based on the pH threshold range, the lower the pH value, the higher the corrosion risk; and using temperature and humidity to assist in determining the erosion environment state of the steel reinforcement.

[0050] In some embodiments, the monitoring system further includes an early warning module and a display module. The early warning module receives the durability of the reinforced concrete structure determined by the durability diagnosis module and issues early warning information to monitoring points with abnormal problems. The display module displays the durability judgment results of the reinforced concrete structure and provides users with data query and historical trend analysis controls. In this way, the setting of the early warning module and the display module can realize the rapid transmission of early warning information, implementation of monitoring and development prediction, and can provide early warnings to relevant departments and owners in advance to help them formulate countermeasures in advance and avoid greater damage.

[0051] Some existing sensors developed both domestically and internationally suffer from problems such as data transmission being affected by the environment and cable length, resulting in poor stability and accuracy of monitoring data.

[0052] In some embodiments of the present invention, the data acquisition and transmission module uses a high-performance, low-power Cortex-M3 microprocessor as the control core, and the acquisition channel uses AC impedance and high input impedance amplifier technology to realize the synchronous and precise measurement of multiple high-impedance signals, which facilitates stable monitoring and transmission of multiple durability parameters.

[0053] As a digital monitoring terminal, it can connect to the reinforced concrete durability monitoring sensor that has been installed on-site. It can complete the real-time acquisition and remote wireless transmission of field data via RS485 bus. After the monitoring data is summarized, it is automatically sent to the reinforced concrete corrosion monitoring system management software platform via the built-in wireless network. The big data platform is used to complete the data analysis, evaluation and subsequent guidance functions. At the same time, the data acquisition and transmission module also integrates short-range wireless Bluetooth communication function, which allows on-site maintenance personnel to conduct real-time analysis of equipment status and adjust parameters via mobile phone.

[0054] A method for monitoring the durability of reinforced concrete structures can be implemented using the durability monitoring device for reinforced concrete structures described in the above embodiments. The method in this embodiment may include the following steps:

[0055] S11. Install monitoring sensors inside the reinforced concrete structure to collect durability parameters that reflect the durability of the reinforced concrete structure. The durability parameters include half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity data.

[0056] S12. Use the data acquisition and transmission module to acquire durability parameters, perform signal processing on the durability parameters, and transmit the processed signal carrying the durability parameters.

[0057] S13. Then, the data analysis module receives and analyzes the transmitted signal carrying durability parameters, and evaluates the durability of the reinforced concrete structure based on the half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity data.

[0058] S14. Finally, the durability of the reinforced concrete structure is determined by the evaluation and analysis results of the degree of change in the internal durability parameters of the concrete.

[0059] In this embodiment, monitoring sensors inside the reinforced concrete structure are used to collect durability parameters reflecting the structure's durability. A data acquisition and transmission module then collects these parameters, processes them, and transmits the processed signals. A data analysis module then analyzes the parameters, assesses the degree of durability based on these parameters, and finally determines the durability based on the assessment results. This method allows for the collection of durability parameters from the reinforced concrete structure, providing a quantifiable representation of its durability. It enables a comprehensive evaluation of the reinforced concrete structure's durability performance and improves the accuracy of monitoring results.

[0060] The technical features in the method embodiments of this application are the same as or similar to the technical features in the device embodiments, and can be referred to each other in detail.

[0061] It should be noted that in this document, the terms "upper," "lower," etc., indicating orientation or positional relationship, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. This will be understood by those skilled in the art through the specific circumstances.

[0062] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A durability monitoring system for reinforced concrete structures, characterized in that, include: Monitoring sensors are deployed inside reinforced concrete structures to collect durability parameters that reflect the degree of corrosion in the reinforced concrete structures. The durability parameters include: half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity data; The data acquisition and transmission module is used to acquire the durability parameters, perform signal processing on the durability parameters, and transmit the processed signal carrying the durability parameters. The data analysis module receives and analyzes the transmitted signals carrying the durability parameters, and evaluates the durability of the reinforced concrete structure based on data such as half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity. The durability diagnostic module is used to determine the durability of the reinforced concrete structure based on the durability assessment analysis results.

2. The durability monitoring system for reinforced concrete structures according to claim 1, characterized in that, The data analysis module is specifically used for: The corrosion risk of steel bars is assessed based on the half-cell potential data; the resistivity change of concrete is determined based on the resistivity data; the internal environmental state of concrete is monitored by chloride ion concentration, pH value, temperature and humidity data; and the corrosion rate of steel bars under actual working conditions is assessed using corrosion rate data.

3. The durability monitoring system for reinforced concrete structures according to claim 1, characterized in that, The monitoring sensor includes: a sensor compartment, a first circuit compartment and a second circuit compartment. The sensor compartment is located above the first circuit compartment, and the first circuit compartment is located above the second circuit compartment. The sensor compartment is connected to the first circuit compartment, and the first circuit compartment is connected to the second circuit compartment. It is used to place circuit boards and run cables. The sensor compartment contains an ER resistance probe, a resistivity electrode, a pH electrode, a chloride ion selective electrode, a long-lasting graphite electrode, and a steel working electrode. Each monitoring electrode is installed longitudinally and parallel to the other in the sensor compartment and is potted together. The data acquisition and transmission module is installed in the first and second circuit compartments. The data acquisition and transmission module includes a signal processing circuit and a data transmission circuit. One end of the signal processing circuit is connected to each electrode in the sensor compartment, and the other end of the signal processing circuit is connected to the data transmission circuit. The output end of the data transmission circuit and the power supply port of the circuit are led out to the outside of the first circuit compartment through a cable and potted.

4. The durability monitoring system for reinforced concrete structures according to claim 3, characterized in that, When the monitoring sensors are installed inside a reinforced concrete structure, each monitoring electrode is in contact with the concrete, and the long-lasting graphite electrode is a reference electrode. The chloride ion concentration is collected by: a chemical reaction between the chloride ion selective electrode and chloride ions in the concrete, causing a change in the potential of the chloride ion selective electrode while the potential of the reference electrode remains unchanged; the chloride ion selective electrode is an Ag / AgCl electrode rod. Measure the potential between the chloride ion selective electrode and the reference electrode; According to the formula: Potential = Slope * lg[Cl] - The chloride ion concentration in the concrete structure is calculated using the intercept. The pH electrode is an IrO2 / Ti electrode rod, with its probe end in contact with concrete. The pH value is acquired by measuring the potential between the pH electrode and the reference electrode. The pH value inside the concrete structure can be calculated using the formula: Potential = Slope * pH + Intercept.

5. The durability monitoring system for reinforced concrete structures according to claim 3, characterized in that, The resistivity electrode comprises two 316 stainless steel rods arranged in parallel and spaced apart. The resistivity electrode has a length of 50-120 mm, a diameter of 4-20 mm, and a distance of 20-40 mm between the two resistivity electrodes.

6. The durability monitoring system for reinforced concrete structures according to claim 3, characterized in that, The steel working electrode is embedded in concrete, and the half-cell potential is obtained by measuring the potential difference between the graphite reference electrode and the steel working electrode. After the measurement sensor is installed, it should be fully encased in concrete from the construction site to ensure that the sensor accurately acquires data.

7. The durability monitoring system for reinforced concrete structures according to claim 3, characterized in that, The ER resistance probe is used to measure the resistance change on the surface of a metal test piece made of the same material as the steel reinforcement in the field. The corrosion rate of the steel reinforcement inside the reinforced concrete structure is calculated based on the measured resistance value.

8. The durability monitoring system for reinforced concrete structures according to claim 2, characterized in that, The assessment of steel reinforcement corrosion risk based on the half-cell potential data includes: The degree of steel corrosion is determined by comparing the half-cell potential with different corrosion potential thresholds. The method of diagnosing concrete resistivity changes based on resistivity data includes: The degree of steel reinforcement corrosion is determined by comparing the resistivity with different levels of concrete resistivity thresholds, wherein there is a corresponding relationship between different levels of concrete resistivity thresholds and the degree of steel reinforcement corrosion. The monitoring of the corrosive environment within concrete using data on chloride ion concentration, pH value, temperature, and humidity includes: By comparing the chloride ion concentration with the chloride ion content threshold in concrete, the corrosion tendency of steel bars in concrete can be monitored. Simultaneously, monitor changes in pH value inside the reinforced concrete structure; Determine the pH threshold range corresponding to the passivation film state on the steel bar surface where the pH value is located, and determine the corrosion environment state of the steel bar based on the pH threshold range. The lower the pH value, the higher the corrosion risk. In addition, the temperature and humidity are used to help determine the corrosive environment of the reinforcing steel.

9. The durability monitoring system for reinforced concrete structures according to claim 1, characterized in that, It also includes an early warning module and a display module. The early warning module is used to receive the durability of the reinforced concrete structure determined by the durability diagnosis module and to issue early warning information for monitoring points with abnormal problems. The display module is used to show the durability diagnosis results of the reinforced concrete structure and provide users with data query and historical trend analysis controls.

10. A method for monitoring the durability of reinforced concrete structures, characterized in that, include: Monitoring sensors are deployed inside the reinforced concrete structure to collect durability parameters that reflect the durability of the reinforced concrete structure. These durability parameters include half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature, and humidity data. The data acquisition and transmission module is used to acquire durability parameters, perform signal processing on the durability parameters, and transmit the processed signal carrying the durability parameters. The data analysis module then receives and analyzes the transmitted signals carrying durability parameters, and evaluates the durability of the reinforced concrete structure based on data such as half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity. Finally, the durability of the reinforced concrete structure is determined by evaluating the degree of change in the internal durability parameters of the concrete.

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