Durability monitoring system and method for reinforced concrete structure

Abstract

The embodiment of the invention discloses a durability monitoring system and a durability monitoring method for a reinforced concrete structure, which are convenient for comprehensively and accurately monitoring the durability of the reinforced concrete structure and relate to the field of corrosion protection engineering. The durability monitoring system of the reinforced concrete structure comprises monitoring sensors which are arranged in the reinforced concrete structure and used for respectively collecting parameters reflecting durability of the reinforced concrete structure; the data acquisition and transmission module is used for transmitting signals of the processed durability parameters; the data analysis module receives and analyzes the transmitted signal of the durability parameter, and analyzes and evaluates the durability degree of the reinforced concrete structure according to the data; and the durability diagnosis module is used for determining the durability of the reinforced concrete structure according to the corrosion influence degree evaluation and analysis result. The method is suitable for concrete durability monitoring scenes.

Description

Technical Field

[0001] The invention relates to the field of corrosion protection engineering, and in particular to a durability monitoring system and a monitoring method for a reinforced concrete structure. Background Art

[0002] In the field of corrosion protection engineering, especially in 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 life-threatening situations. Therefore, there is an urgent need for a nondestructive monitoring system that can monitor and warn the durability of steel bars in real time online.

[0003] At present, non-destructive testing technology has been widely used in reinforced concrete structures, including electromagnetic technology, eddy current technology, ultrasonic technology and infrared technology. These technologies judge the corrosion condition of internal steel bars by monitoring the changes in the physical properties of concrete; however, steel bar corrosion is essentially an electrochemical process, so corrosion electrochemical detection technology has significant advantages in obtaining early corrosion information. Summary of the invention

[0004] In view of this, the present invention aims to provide a reinforced concrete structure durability monitoring system and monitoring method, so as to facilitate comprehensive and accurate monitoring of the durability of the reinforced concrete structure.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: In a first aspect, an embodiment of the present invention provides a durability monitoring system for a reinforced concrete structure, comprising: a monitoring sensor, arranged inside the reinforced concrete structure, for respectively 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 and performing signal processing on the durability parameters, and transmitting the processed signals carrying the durability parameters; a data analysis module, for receiving the transmitted signals carrying the durability parameters and analyzing them, and analyzing the data according to the half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity; a durability diagnosis module, for determining the durability of the reinforced concrete structure according to the corrosion impact assessment analysis results.

[0006] Optionally, the data analysis module is specifically used to: evaluate the risk of steel corrosion based on the half-cell potential data; and, determine the resistivity change of concrete based on the resistivity data; and, monitor the changes in the internal environmental state of concrete through chloride ion concentration, pH value, temperature and humidity data; and, use corrosion rate data to evaluate the corrosion rate of steel under actual working conditions.

[0007] Optionally, the monitoring sensor includes: a sensor cabin, a first circuit cabin and a second circuit cabin, the sensor cabin is located above the first circuit cabin, the first circuit cabin is located above the second circuit cabin, the sensor cabin is connected to the first circuit cabin, the first circuit cabin is connected to the second circuit cabin, and is used to place circuit boards and thread cables; the sensor cabin contains an ER resistance probe, a resistivity electrode, a pH electrode, a chloride ion selective electrode, a long-acting graphite electrode and a steel bar working electrode, and the monitoring electrodes are longitudinally and parallelly installed in the sensor cabin and are sealed with each other; the data acquisition and transmission module is arranged in the first circuit cabin and the second circuit cabin, and the data acquisition and transmission module includes: a signal acquisition and processing circuit and a data transmission circuit, one end of the signal processing circuit is connected to each electrode in the sensor cabin, 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 cabin through a cable and are sealed.

[0008] Optionally, when the monitoring sensor is arranged 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: chemically reacting the chloride ion selective electrode with the chloride ions in the concrete to change 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; and measuring the potential between the chloride ion selective electrode and the reference electrode; According to the formula: Potential = Slope × lg[Cl - ] + intercept to calculate the chloride ion concentration in the concrete structure; The pH electrode is The electrode rod has a detection end in contact with the concrete, and the pH value is collected by measuring the potential between the pH electrode and the reference electrode; The pH value inside the concrete structure is calculated according to the formula: potential = slope × pH + intercept.

[0009] 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 between the two resistivity electrodes of 20-40 mm.

[0010] Optionally, the steel bar electrode is buried in concrete, and the half-cell potential is obtained by measuring the potential difference between the graphite reference electrode and the steel bar electrode; after the measuring sensor is installed, the concrete at the construction site should be used to fully wrap the sensor to ensure that the sensor accurately obtains data.

[0011] Optionally, the ER resistance probe is used to measure the resistance change of the surface of a metal test piece inside the probe that is made of the same material as the on-site steel bars, and the corrosion rate of the steel bars inside the reinforced concrete structure is calculated based on the measured resistance value.

[0012] Optionally, the assessing the steel corrosion risk according to the half-cell potential data includes: comparing the half-cell potential with different steel corrosion potential thresholds to determine the corrosion degree of the steel; the diagnosing the resistivity change of concrete according to the resistivity data includes: determining the corrosion degree of the steel according to the resistivity comparison with different concrete resistivity thresholds, wherein there is a corresponding relationship between different concrete resistance thresholds and the corrosion degree of the steel; the monitoring the corrosion environment in the concrete through the chloride ion concentration, pH value, temperature and humidity data includes: monitoring whether the steel in the concrete has a tendency to corrode according to the comparison of the chloride ion concentration with the chloride ion content threshold in the concrete; At the same time, the changes in the pH value inside the reinforced concrete structure are monitored, and the pH threshold interval corresponding to the state of the passivation film on the surface of the steel bar at the pH value is determined. The corrosive environment state of the steel bar is determined according to the pH threshold interval. The lower the pH value, the higher the corrosion risk; and the temperature and humidity are used to assist in determining the corrosive environment state of the steel bar.

[0013] Optionally, the monitoring system also includes: an early warning module and a display module, wherein 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 to 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.

[0014] In a second aspect, an embodiment of the present invention further provides a durability monitoring method for a reinforced concrete structure. The monitoring sensors are placed inside the reinforced concrete structure to collect durability parameters such as half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity data that reflect the durability of the reinforced concrete structure; Using a data acquisition and transmission module to collect durability parameters, perform signal processing on the durability parameters, and transmit the processed durability parameter signals; The data analysis module is then used to receive and analyze the transmitted durability signal parameters, and the durability of the reinforced concrete structure is evaluated based on the half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity data analysis; Finally, the durability of the reinforced concrete structure is determined by evaluating and analyzing the degree of change of the durability parameters inside the concrete.

[0015] The embodiment of the present invention provides a durability monitoring system and method for reinforced concrete structures. Monitoring sensors are arranged inside the reinforced concrete structure to collect durability parameters reflecting the durability of the reinforced concrete structure. A data acquisition and transmission module is used to perform signal processing on the collected durability parameters, and the processed signals carrying the durability parameters are transmitted. Then, a data analysis module is used to receive and analyze the signals carrying the durability parameters. Finally, a durability diagnosis module is used to determine the durability of the reinforced concrete structure through corrosion impact assessment analysis results. Finally, the data is automatically uploaded to a cloud server for viewing by a computer and a mobile phone. By collecting multiple durability parameters inside the reinforced concrete structure, for example, the pH value and Cl in the concrete can be analyzed. - Concentration monitoring can also monitor the changes in resistivity and corrosion rate in concrete, and characterize the durability of reinforced concrete structures based on multiple durability parameters, making it easier to comprehensively and accurately monitor the durability changes of reinforced concrete structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of a monitoring sensor in a durability monitoring system for reinforced concrete structures in one embodiment of the present invention; Figure 2 A top view of a monitoring sensor in a durability monitoring system for reinforced concrete structures in one embodiment of the present invention; Figure 3 It is a schematic flow chart of a durability monitoring method for reinforced concrete structures in one embodiment of the present invention. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

[0020] See also Figure 1 A durability monitoring system for a reinforced concrete structure provided in this embodiment includes: a monitoring sensor 10, which is arranged inside the reinforced concrete structure and is used to collect durability parameters reflecting the corrosion degree 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, which is used to collect durability parameters and perform signal processing on the durability parameters, and transmit the processed signals carrying the durability parameters; a data analysis module, which receives the transmitted signals carrying the durability parameters and analyzes them, and evaluates the durability degree of the reinforced concrete structure according to the half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity data; a durability diagnosis module, which is used to determine the durability of the reinforced concrete structure according to the durability degree evaluation analysis results.

[0021] The durability monitoring system for reinforced concrete structures provided by the embodiment of the present invention arranges monitoring sensors inside the reinforced concrete structure to collect durability parameters reflecting the durability of the reinforced concrete structure, uses a data acquisition and transmission module to perform signal processing on the collected durability parameters, and transmits the processed signals carrying the durability parameters; then uses a data analysis module to receive and analyze the signals carrying the durability parameters, and finally uses a durability diagnosis module to determine the durability of the reinforced concrete structure through corrosion impact assessment analysis results, and finally automatically uploads the data to a cloud server for viewing by a computer terminal and a mobile phone terminal; by collecting multiple durability parameters inside the reinforced concrete structure, for example, the pH value and Cl in the concrete can be analyzed. - Concentration monitoring can also monitor the changes in resistivity and corrosion rate in concrete, and characterize the durability of reinforced concrete structures based on multiple durability parameters, making it easier to comprehensively and accurately monitor the durability changes of reinforced concrete structures.

[0022] More specifically, the present invention collects multiple durability parameters inside the reinforced concrete structure, such as pH value and Cl - Concentration monitoring can also monitor the state and corrosion rate of steel bars in concrete, and characterize the durability of reinforced concrete structures based on multiple durability parameters, making it easier to comprehensively and accurately monitor the durability of reinforced concrete structures.

[0023] In some embodiments, the data analysis module is specifically used to: evaluate the risk of steel corrosion based on the half-cell potential data; and, determine the resistivity change of concrete based on the resistivity data; and, monitor the change of the internal environment state of concrete through chloride ion concentration, pH value, temperature and humidity data; and, evaluate the corrosion rate of steel under actual working conditions using corrosion rate data; It should be understood that the durability of reinforced concrete structures is affected by pH, Cl - , temperature and humidity interact, pH value decreases, Cl - Increased concentration, temperature and humidity may cause corrosion of internal steel bars, thus affecting the overall durability of the structure.

[0024] See also Figure 1 , Figure 2 In some embodiments, the monitoring sensor 10 includes: a sensor cabin 101, a first circuit cabin 102 and a second circuit cabin 103. The sensor cabin 101 is located above the first circuit cabin 102, and the first circuit cabin 102 is located above the second circuit cabin 103. The sensor cabin 101 is connected to the first circuit cabin 102, and the first circuit cabin 102 is connected to the second circuit cabin 103, and is used to place circuit board components and run cables; the sensor cabin 101 contains an ER resistance probe 104, a resistivity electrode 105, a pH electrode 106, a chloride ion selective electrode 107, a long-lasting graphite electrode 108 and a steel bar electrode 109, and each electrode is longitudinally and parallelly installed in the sensor cabin and is potted with each other; a data acquisition and transmission module 11 is arranged in the first circuit cabin, and the data The acquisition and transmission module 11 includes: a signal processing circuit 111 and a data transmission circuit 112. One end of the signal processing circuit is connected to the electrodes in the sensor cabin, and the other end of the signal processing circuit 111 is connected to the data transmission circuit 112. The output end of the data transmission circuit 112 and the power supply port of the circuit are led out to the outside of the first circuit cabin 102 through a cable and are sealed. Among them, the top-down arrangement of the sensor cabin, the first circuit cabin and the second circuit cabin facilitates the overall packaging and debugging of the equipment. At the same time, the sensor cabin adopts an overall integrated design, which can integrate different sensors and increase the capacity of the sensor cabin. In order to ensure waterproofness, the positions where the cabin contacts the external environment adopt a waterproof and anti-corrosion design to ensure that the overall sealing can meet the requirements of the on-site use environment.

[0025] See also Figure 1In some embodiments, when the monitoring sensor 10 is arranged inside the reinforced concrete structure, each monitoring electrode is in contact with the concrete, and the long-lasting graphite electrode is the reference electrode; the chloride ion concentration is collected by: the chloride ion selective electrode reacts chemically with the chloride ions in the concrete to change the potential of the chloride ion selective electrode, and 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: Potential = slope × lg[Cl - ]+intercept, calculate the chloride ion concentration in the concrete structure; pH electrode is The electrode rod, whose detection end is in contact with the concrete, collects the pH value by measuring the potential between the pH electrode and the reference electrode; according to the formula: Potential = slope × pH + intercept to calculate the pH value inside the concrete structure; Among them, the chloride ion content refers to the sum of the chloride ion contents of various raw materials in concrete, expressed as its weight ratio to the cementitious material; the pH value of the initial concrete after hydration is ≥12.6, which produces a dense passivation film on the surface of the steel bar. When chloride ions enter the concrete and reach the surface of the steel bar, the passivation film begins to be partially destroyed; when the pH value drops to about 11.5, the passivation film will no longer be stable. When the pH value drops to the range of 9~10, the effect of the passivation film will be completely destroyed, the steel bar is in a depassivation state, and there is a high probability of rust. When carbonization and dissolution occur in the concrete, its pH value can be reduced to below 9, and the corrosion protection of the steel bar cannot be guaranteed, which causes the passivation film on the surface of the steel bar to be destroyed.

[0026] See also Figure 2 In some embodiments, the resistivity electrode 105 includes 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 spacing of 20-40 mm between the two resistivity electrodes; wherein, the concrete resistivity is output voltage / output current, and when the concrete resistivity is greater than 100 KΩ·cm, the steel bar will not rust; when the concrete resistivity is in the range of 50-100 KΩ·cm, the steel bar will rust, but the rust rate is relatively slow; when the concrete resistivity is in the range of 10-50 KΩ·cm, when the steel bar rusts, a medium to high rust rate may occur; in addition, the two 316 stainless steel rods arranged in parallel and spaced apart in the resistivity electrode reduce the occupied volume of the resistivity electrode.

[0027] See also Figure 2In some embodiments, the steel bar electrode 109 is buried in concrete, and the half-cell potential is obtained by measuring the potential difference between the graphite reference electrode and the steel bar electrode; after the measuring sensor is installed, the concrete at the construction site is used to fully wrap the sensor cabin to ensure that the sensor accurately obtains data; wherein, the steel bar electrode 109 is divided into an anode area and a cathode area, the steel bar electrode is the anode area, the anode area is the activation area, and the cathode area is the passivation area. The activation area and the passivation area of ​​the steel bar in the concrete show different corrosion potentials. When the steel bar is passivated, the corrosion potential increases and the potential is positive; when it changes from the passive state to the activated state, the corrosion potential decreases and the potential is negative.

[0028] In some prior arts, sensors based on the principle of corrosion electrochemistry can effectively monitor reinforced concrete structures; for example, the invention patent with publication number CN101706408A discloses a reinforced concrete embedded corrosion sensor, which is also a reinforced concrete embedded corrosion sensor. The sensor is provided with 4 pairs of corrosion galvanic couples, a hollow rod, a base and connecting wires. It is installed in the concrete before pouring the concrete, and the reinforced concrete structure can be monitored for a long time from an early stage. However, this type of sensor is based on the principle of galvanic corrosion, and an anode and cathode galvanic pair is set in the sensor. During measurement, the corrosion data of the galvanic pair is measured according to the different degrees of corrosion of the concrete to judge the degree of deterioration of the concrete. However, this steel corrosion monitoring sensor based on the principle of macroscopic galvanic battery monitors the galvanic corrosion current between the anode and the inert cathode, and does not directly measure the corrosion rate of the steel bar.

[0029] In addition, there are some existing technologies that mainly evaluate by measuring the steel bar corrosion current density. For example, by monitoring the resistivity of concrete, the system resistance is compensated when monitoring the steel bar corrosion current density, so as to obtain more accurate monitoring of the steel bar corrosion rate.

[0030] See also Figure 2 In some embodiments, the ER resistance probe 104 is used to measure the resistance change of the metal test piece surface inside the probe that is made of the same material as the on-site steel bars, and the corrosion rate of the steel bars inside the reinforced concrete structure is calculated based on the measured resistance value; wherein, the judgment index of the ER corrosion rate is the remaining thickness ratio, and the remaining thickness ratio is the non-corrosion probe voltage / corrosion probe voltage. The working principle of the ER corrosion rate measurement probe is based on the relationship between the resistance and conductivity of the corrosive substance. When the metal surface corrodes, the corrosive substance will cause the resistance of the metal surface to change, thereby affecting the resistance value of the probe. By measuring the resistance change of the probe, the corrosion rate of the metal can be calculated.

[0031] In this embodiment, compared with the test method of steel bar corrosion in the above-mentioned prior art, by setting up the ER resistance probe 104, the corrosion rate of the steel bar can be directly measured, and the corrosion rate measurement is more stable than that of the three-electrode system.

[0032] In some embodiments, assessing the risk of steel bar corrosion based on half-cell potential data includes: comparing the half-cell potential with different levels of steel bar corrosion potential thresholds to determine the degree of steel bar corrosion; judging the resistivity change of concrete based on resistivity data includes: determining the degree of steel bar corrosion based on the resistivity comparison with different levels of concrete resistivity thresholds; wherein there is a corresponding relationship between different levels of concrete resistance thresholds and the degree of steel bar corrosion; monitoring the corrosive environment in concrete through chloride ion concentration, pH value, temperature and humidity data includes: monitoring whether the steel bars in the concrete have a tendency to corrode based on the chloride ion concentration comparison with the chloride ion content threshold in the concrete; at the same time, monitoring the change of pH value inside the reinforced concrete structure, judging the pH threshold interval corresponding to the state of the steel bar surface passivation film at the pH value, and determining the state of the corrosive environment in which the steel bars are located based on the pH threshold interval, wherein the lower the pH value, the higher the corrosion risk; and, auxiliary judgment of the state of the corrosive environment in which the steel bars are located based on temperature and humidity.

[0033] In some embodiments, the monitoring system 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 issue early warning information to the monitoring points with abnormal problems; the display module is used to display the durability judgment results of the reinforced concrete structure, and provide 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 forecasting, and can issue early warnings to relevant departments and owners, helping them to formulate response measures in advance and avoid major damage.

[0034] Some existing sensors developed at home and abroad have the problem that data transmission is affected by the environment and cable length, and the monitoring data stability and accuracy are poor.

[0035] In this regard, in some embodiments of the present invention, the data acquisition and transmission module adopts 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 achieve synchronous and precise measurement of multiple high-impedance signals, which facilitates stable monitoring and transmission of multiple durability parameters.

[0036] As a digital monitoring terminal, it can be connected to the reinforced concrete durability monitoring sensor that has been installed on site, and complete the real-time collection and remote wireless transmission of on-site data through the RS485 bus. After the monitoring data is summarized, it is automatically sent to the reinforced concrete corrosion monitoring system management software platform through the built-in wireless network function, and the data analysis, evaluation and subsequent guidance functions are completed through the big data platform. At the same time, the data acquisition and transmission module also integrates short-range wireless Bluetooth communication function, which is convenient for on-site maintenance personnel to perform real-time analysis of equipment status and parameter adjustment functions through mobile phones.

[0037] A durability monitoring method for a reinforced concrete structure can be implemented using the durability monitoring device for a reinforced concrete structure in the above embodiment. The method of this embodiment may include the following steps: S11, placing monitoring sensors inside the reinforced concrete structure to collect durability parameters such as half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity that reflect the durability of the reinforced concrete structure; S12, using a data acquisition and transmission module to collect durability parameters, perform signal processing on the durability parameters, and transmit the processed durability parameter signals; S13, receiving and analyzing the transmitted electrochemical signal parameters using the data analysis module, and evaluating the degree of corrosion impact on the reinforced concrete structure based on the half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity data analysis; S14. Finally, the durability of the reinforced concrete structure is determined through evaluation and analysis of the degree of change of the durability parameters inside the concrete.

[0038] In this embodiment, monitoring sensors inside the reinforced concrete structure are used to collect durability parameters reflecting the reinforced concrete structure, and then a data acquisition and transmission module is used to collect the durability parameters and perform signal processing on the durability parameters and transmit the processed durability parameter signals, and then a data analysis module is used to analyze the durability parameters, and the degree of corrosion influence on it is evaluated based on the durability parameter analysis, and finally its durability is determined based on the evaluation results. The durability parameters of the reinforced concrete structure can be collected, and the durability of the steel bars can be digitized, so that the durability performance of the reinforced concrete structure can be comprehensively evaluated, thereby improving the accuracy of the monitoring results.

[0039] The technical features in the technical solutions of the method embodiments of the present application are the same as or similar to the technical features of the device embodiments, and specific reference may be made to each other.

[0040] It should be noted that, in this article, the terms "upper", "lower", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. Relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article, or device. In the absence of more restrictions, the elements defined by the phrase "comprising a ..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements. For ordinary technicians in this field, it can be understood by specific circumstances.

[0041] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A durability monitoring system for reinforced concrete structures, characterized in that: include: Monitoring sensors are arranged inside the reinforced concrete structure to collect parameters reflecting 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; A data acquisition and transmission module, used for acquiring the durability parameters, performing signal processing on the durability parameters, and transmitting the processed signals carrying the durability parameters; A data analysis module receives and analyzes the transmitted signal carrying the durability parameter, 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 analysis; A durability diagnosis module is used to determine the durability of the reinforced concrete structure based on the durability evaluation analysis result.

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 risk of steel bar corrosion is evaluated based on the half-cell potential data; and the resistivity change of concrete is determined based on the resistivity data; and the changes in the internal environmental state of concrete are monitored through chloride ion concentration, pH value, temperature and humidity data; and the corrosion rate of steel bars under actual working conditions is evaluated using the corrosion rate data.

3. The durability monitoring system for reinforced concrete structures according to claim 1, characterized in that: The monitoring sensor comprises: a sensor cabin, a first circuit cabin and a second circuit cabin, wherein the sensor cabin is located above the first circuit cabin, the first circuit cabin is located above the second circuit cabin, the sensor cabin is connected to the first circuit cabin, and the first circuit cabin is connected to the second circuit cabin, and is used for placing circuit boards and laying cables; The sensor cabin comprises an ER resistance probe, a resistivity electrode, a pH electrode, a chloride ion selective electrode, a long-acting graphite electrode and a steel bar working electrode, and the monitoring electrodes are longitudinally installed in parallel in the sensor cabin and are potted with each other; The data acquisition and transmission module is arranged in the first circuit compartment and the second circuit compartment, and 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 the electrodes in the sensor compartment, and the other end of the signal processing circuit is connected to the data transmission circuit, and 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 are potted.

4. The durability monitoring system for reinforced concrete structures according to claim 1, characterized in that: When the monitoring sensor is arranged inside a reinforced concrete structure, each monitoring electrode is in contact with the concrete, and the long-acting graphite electrode is a reference electrode; The chloride ion concentration is collected in the following manner: the chloride ion selective electrode reacts chemically with the chloride ions in the concrete to change 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; measuring the potential between the chloride ion selective electrode and a reference electrode; According to the formula: Potential = Slope × lg[Cl - ] + intercept to calculate the chloride ion concentration in the concrete structure; The pH electrode is The electrode rod has a detection end in contact with the concrete, and the pH value is collected by measuring the potential between the pH electrode and the reference electrode; The pH value inside the concrete structure is calculated according to the formula: potential = slope × pH + intercept.

5. The durability monitoring system for reinforced concrete structures according to claim 1, 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 between the two resistivity electrodes of 20-40 mm.

6. The durability monitoring system for reinforced concrete structures according to claim 1, characterized in that: The steel bar electrode is buried in concrete, and the half-cell potential is obtained by measuring the potential difference between the graphite reference electrode and the steel bar electrode; After the measuring sensor is installed, the concrete at the construction site should be used to fully wrap the sensor to ensure that the sensor can accurately obtain data.

7. The durability monitoring system for reinforced concrete structures according to claim 1, characterized in that: The ER resistance probe is used to measure the resistance change of the metal test piece surface inside the probe which is made of the same material as the on-site steel bars, and the corrosion rate of the steel bars 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 step of assessing the steel bar corrosion risk according to the half-cell potential data comprises: The half-cell potential is compared with different steel bar corrosion potential thresholds to determine the degree of steel bar corrosion; The method of diagnosing the resistivity change of concrete according to the resistivity data comprises: Determining the corrosion degree of the steel bars by comparing the resistivity with different degrees of concrete resistivity thresholds, wherein there is a corresponding relationship between different degrees of concrete resistance thresholds and the corrosion degree of the steel bars; The method of monitoring the corrosive environment in concrete by using chloride ion concentration, pH value, temperature and humidity data includes: By comparing the chloride ion concentration with the chloride ion content threshold in concrete, monitor whether the steel bars in the concrete have a tendency to corrode; At the same time, the changes in pH value inside the reinforced concrete structure are monitored; Determine the pH threshold interval corresponding to the state of the steel bar surface passivation film at the pH value, and determine the state of the steel bar's corrosive environment according to the pH threshold interval, the lower the pH value, the higher the corrosion risk; Furthermore, the temperature and humidity are used to assist in determining the state of the corrosive environment in which the steel bars are located.

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, wherein 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 to 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.

10. A durability monitoring method for reinforced concrete structure, characterized in that: include: The monitoring sensors are placed inside the reinforced concrete structure to collect durability parameters such as half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity data that reflect the durability of the reinforced concrete structure; Using a data acquisition and transmission module to collect durability parameters, perform signal processing on the durability parameters, and transmit the processed durability parameter signals; The data analysis module is then used to receive and analyze the transmitted durability signal parameters, and the durability of the reinforced concrete structure is evaluated based on the half-cell potential, resistivity, chloride ion concentration, pH value, corrosion rate, temperature and humidity data analysis; Finally, the durability of the reinforced concrete structure is determined by evaluating and analyzing the degree of change of the durability parameters inside the concrete.

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