CN110823983A - Real-time monitoring device and detection method for reinforced bar galvanic couples in concrete - Google Patents
Real-time monitoring device and detection method for reinforced bar galvanic couples in concrete Download PDFInfo
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- CN110823983A CN110823983A CN201910950048.1A CN201910950048A CN110823983A CN 110823983 A CN110823983 A CN 110823983A CN 201910950048 A CN201910950048 A CN 201910950048A CN 110823983 A CN110823983 A CN 110823983A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
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Abstract
A device and a method for monitoring reinforcement macrogalvanic couple in concrete in real time are designed for detecting the corrosion state of the reinforcement in the concrete, and belong to the technical field of quality detection equipment; the device for monitoring the reinforced bar macro galvanic couple in the concrete in real time consists of a plurality of anodes, cathodes, leads, a threading buried pipe, a sensor detector and an external receiving device; the detection probe is embedded in the concrete member; each anode is respectively communicated with the cathode through a lead and a sensor detector; the lead passes through the threading buried pipe buried in the member concrete to connect the anodes, the cathodes and the sensor detector into a whole; the invention has the advantages of small appearance, convenient carrying, integration of the whole detection device, wireless transmission of detected data to an external receiving device, real-time monitoring of corrosion state and effective prediction of the service life of the concrete structure.
Description
Technical Field
A device and a method for monitoring reinforcement macrogalvanic couples in concrete in real time are designed for detecting the corrosion state of reinforcements in concrete for a long time, and belong to the technical field of quality detection equipment. .
Background
Along with the economic development of China and the improvement of the technical level of building construction, the requirement on the durability of concrete is higher and higher, and the corrosion of steel bars is one of the main reasons for reducing the durability of a concrete structure; at present, the concrete structure damage caused by the reinforcement corrosion in the concrete has the characteristics of universality, severity, complexity and concealment, as is well known, whether the reinforcement is corroded is known to exist in the concrete, if the reinforcement is corroded, the severity degree and the development speed of the reinforcement corrosion are known to exist, the prior art is difficult to judge, once the reinforcement corrosion can be seen from the appearance, the concrete structure is difficult to repair and at least cannot recover, and the important structure cannot be allowed; therefore, if a real-time monitoring device can be buried in the concrete of an important structural member, the detected data can be wirelessly transmitted to an external receiving device, so that the corrosion state can be monitored in real time, and the service life of the concrete structure can be effectively predicted. In order to solve the above problems, a subject group has studied and reported a utility model patent "a probe for detecting a corrosion state of a reinforcement in concrete" (patent No.: zl201820991490. x) and an invention patent "an apparatus for detecting a corrosion state of a reinforcement in concrete and a detection method thereof in an embedded manner" (patent application No.: 201810671105.8), but the problem of "reinforcement macro galvanic couple real-time monitoring" is still not solved.
The reinforcing steel bar macro galvanic couple real-time monitoring device provided by the invention can solve the problems.
Disclosure of Invention
The technical scheme adopted by the invention is as follows: a real-time monitoring device for a steel bar macro galvanic couple in concrete shown in figures 1 and 2 comprises a steel bar macro galvanic couple detection device and an external receiving device; the steel bar macro galvanic couple detection device consists of an anode, a cathode, a lead, a threading sleeve, a sensor detector, an insulating bracket and insulating glue; the steel bar macro galvanic couple detection device is fixedly connected to the transverse steel bar in the concrete or the vicinity of the longitudinal steel bar in the concrete, the anode, the cathode and the sensor detector are integrally connected through insulating glue, and the anode and the cathode are respectively communicated with the sensor detector through leads and are embedded in the concrete member; the lead wire passes through the threading sleeve buried in the concrete of the member to connect the anode and the cathode with the sensor detector into a whole. The corrosion state of the steel bar to be detected in the concrete can be reflected by the sensor detector.
The anodes are columnar parts used for being close to the detected steel bar material, and the five anodes which are not positioned at the height of the steel bar to be detected are preferentially recommended to be made of short steel bars with the diameter of 6-10 mm and the length of 100-200 mm; the anode with the same height as the position of the steel bar to be detected is preferentially recommended to be made of the steel bar with the diameter of 14-30 mm and the length of 200-300 mm; one end of each anode is provided with an ear hole connected with a lead, and each anode is communicated with the lead through the ear hole; each anode is distributed on the insulating support in a step shape through insulating glue to form a whole.
The cathode is a columnar component, preferably, stainless steel with the diameter similar to that of the anode at the position of the steel bar to be detected is adopted as a matrix, the length is 200-250 mm, and one end of the cathode is provided with an ear hole connected with a lead and is communicated with the lead through the ear hole; the cathode and the anode insulating bracket form a whole through insulating cement to form a triangular pyramid.
The lead is a connecting wire for transmitting the induction state of each electrode of the steel bar macro galvanic couple detection device to the sensor detector, and is preferably made of a copper core plastic wire with the diameter of 0.5 mm, the lead penetrates through the threading sleeve in the concrete member, one end of the lead is connected with each electrode, and the other end of the lead is connected with the sensor detector.
The threading sleeve is a facility for protecting and restricting the trend of a lead embedded in concrete, leading the lead into the sensor detector from each electrode, and preferably adopting a steel pipe with the diameter of 25 mm to manufacture; the threading sleeve is buried in the concrete member as a part of the steel bar macro-galvanic couple detection device.
The sensor detector is a facility for analyzing and processing data transmitted by an anode and a cathode in a steel bar macro galvanic couple detection device embedded in concrete, and consists of an information receiving element, a central processing unit, an information storage element, a switch and a knob; each information receiving element corresponds to a lead of the anode or the cathode, the received information is sent to the central processing unit, analyzed, processed and compared by the central processing unit, and then respectively sent to the information storage element for storage, and wirelessly transmitted to an external receiving device; when the device works, a lead led out from the threading sleeve is connected with the sensor detector, the sensor detector is connected with the anode and the cathode through insulating glue, and the sensor detector is integrated in the reinforcing steel bar macro galvanic couple detection device to form a whole.
The working principle of the device and the method for monitoring the reinforcement macrogalvanic couple in real time in the concrete is designed according to the electrochemical system detection principle macrogalvanic couple method, after the installation and acceptance of the reinforcement is qualified, the reinforcement macrogalvanic couple detection device is embedded beside the reinforcement to be detected, one end of a lead is respectively connected with each electrode of a cathode and an anode, the lead is connected with a sensor detector through a threading sleeve, and data detected by the detector is wirelessly transmitted to an external receiving device; the main contents of data detection are:
① macrogalvanic couple current, which is the most important detection content, can predict the corrosion cracking time of reinforced concrete and the corrosion starting time of the steel bar to be detected in the concrete by monitoring the steel bar in the concrete in real time through the macrogalvanic couple current.
② corrosion current density, which is measured by a three-electrode system formed by an external reference electrode and an internal cathode and anode, and is auxiliary detection for the reinforcing steel bar macro-couple real-time monitoring device.
The steel bar macro galvanic couple detection device has the advantages of small appearance and convenience in carrying, integrates the electrode, the lead and the detector into a whole, wirelessly transmits detected data to an external receiving device, monitors the corrosion state in real time, and effectively predicts the service life of the concrete structure.
Drawings
FIG. 1 is a schematic diagram of a device for monitoring a steel bar thermocouple in concrete in real time;
FIG. 2 is a schematic view of a steel bar macro-galvanic couple detection device;
in the figure: 1-a steel bar macro galvanic couple detection device; 11-an anode; 12-a cathode; 13-a wire; 14-threading a cannula; 15-sensor detector; 16-an insulating support; 17-insulating glue; 2-transverse reinforcing steel bars in the concrete; 3-longitudinal steel bars in the concrete; 4-a concrete member; 5-external receiving device.
Detailed Description
Examples
The key reinforced concrete member of a certain landmark building adopts a concrete internal reinforcing steel bar macro galvanic couple real-time monitoring device shown in figures 1 and 2 to monitor the reinforcing steel bar corrosion condition of the member, and the concrete internal reinforcing steel bar macro galvanic couple real-time monitoring device consists of a reinforcing steel bar macro galvanic couple detection device 1 and an external receiving device 5; the steel bar macro galvanic couple detection device 1 is composed of an anode 11, a cathode 12, a lead 13, a threading sleeve 14, a sensor detector 15, an insulating support 16 and insulating glue 17; the steel bar macro galvanic couple detection device 1 is fixedly connected to the position, close to the transverse steel bar 2 or the longitudinal steel bar 3 in the concrete, of the concrete, the anode 11, the cathode 12 and the sensor detector 15 are bonded into a whole through an insulating glue 17, and the anode 11 and the cathode 12 are respectively communicated with the sensor detector 15 through leads 13 and are embedded in the concrete member 4; the lead wires 13 pass through a threading sleeve 14 embedded in the concrete of the member to integrally connect the anode 11, the cathode 12 and the sensor detector 15. The corrosion status of the steel bar in the concrete can be reflected by the sensor detector 15.
The anode 11 is a columnar part used for being close to the detected steel bar material, and the anode 111, the anode 113, the anode 114, the anode 115 and the anode 116 which are not positioned at the height of the steel bar to be detected are respectively made of short steel bars with the diameters of 8 mm, the lengths of 200 mm, 180 mm, 160 mm, 140 mm and 120 mm; the anode 112 with the same height as the position of the steel bar to be detected is made of the steel bar with the diameter of 16 mm and the length of 220 mm; one end of each anode is provided with an ear hole connected with a lead 13, and each anode is communicated with the lead 13 through the ear hole; each anode is distributed on the insulating support 16 in a step shape through insulating glue 17 to form a whole.
The cathode 12 is a columnar component, stainless steel with the diameter similar to that of the anode 112 at the position of the steel bar to be detected is used as a matrix, the diameter is 16 mm, the length is 240 mm, and one end of the cathode 12 is provided with an ear hole connected with the lead 13 and communicated with the lead 13 through the ear hole; the cathode 12 is integrated with the anode insulating support 16 by an insulating glue 17 to form a triangular pyramid.
The lead 13 is a connecting wire for transmitting the induction state of each electrode of the steel bar macro galvanic couple detection device 1 to the sensor detector 15, and is made of a copper core plastic wire with the diameter of 0.5 mm, the lead 13 penetrates through the threading sleeve 14 in the concrete member 4, one end of the lead is connected with each electrode, and the other end of the lead is connected with the sensor detector 15.
The threading sleeve 14 is a facility for protecting and restricting the trend of the lead 13 embedded in the concrete and leading the lead 13 into the sensor detector 15 from each electrode and is made of a steel pipe with the diameter of 25 mm; the threading bushing 14 is embedded in the concrete member 4 as a part of the reinforcing steel macro-couple detecting apparatus 1.
The sensor detector 15 is a facility for analyzing and processing data transmitted by the anode 11 and the cathode 12 in the steel bar macro galvanic couple detection device 1 embedded in concrete, and consists of an information receiving element, a central processing unit, an information storage element, a switch and a knob; each information receiving element corresponds to the lead 13 of the anode 11 or the cathode 12, the received information is sent to the central processing unit, analyzed, processed and compared by the central processing unit, and then respectively sent to the information storage element for storage and wirelessly transmitted to the external receiving device 5; when the device works, a lead 13 led out from a threading sleeve 14 is connected with a sensor detector 15, the sensor detector 15 is connected with an anode 11 and a cathode 12 through an insulating adhesive 17, and the sensor detector 15 is integrated in the steel bar macro galvanic couple detection device 1 to form a whole.
The working principle of the device and the method for monitoring the reinforcement macro galvanic couple in real time in the concrete is designed according to the electrochemical system detection principle macro galvanic couple method, after the installation and acceptance of the reinforcement are qualified, the reinforcement macro galvanic couple detection device 1 is buried beside the reinforcement to be detected, one end of a lead 13 is respectively connected with each electrode of a cathode 12 and an anode 11, the lead is connected with a sensor detector 15 through a threading sleeve 14, and the measured data is wirelessly transmitted to an external receiving device 5.
The macrocouple method is to determine the degree of anodic corrosion by detecting the magnitude of corrosion current (galvanic corrosion current) between galvanic elements generated when the anodes are dissolved. Due to the presence of microporous water, the electrolyte is actually embedded in the electrolyte solution, and a denier macro-cell is formed. And judging the corrosion degree of the anode steel bar by detecting the galvanic corrosion current. The macro cell thus constructed can obtain a current between the anode and the cathode, which can be measured without using an external current. According to Faraday's theorem, the current drawn by the cathode and anode (measured with a zero resistance meter) corresponds to the iron dissolution of the anode of the macro-cell. Thus, the measured macrocell current is the corrosion rate of the macrocell reaction under specific conditions.
The macro galvanic couple corrosion current can reflect the macro cell corrosion speed and corrosion degree of the steel bars in the concrete to a certain extent, and the size of the macro galvanic couple corrosion current is consistent with the natural electrode potential of the steel bars, the corrosion current density of the steel bars and the visual observation result to a certain extent. The larger the corrosion current is, the smaller the potential of the natural electrode of the steel bar is, and the more serious the corrosion of the steel bar is. Predicting the corrosion start time of the steel bar to be detected in the concrete by using the macro current measured by the steel bar macro galvanic couple real-time monitoring device in the concrete; predicting the corrosion cracking time of the reinforced concrete by using the corrosion current density of the anode 111 in the reinforced steel bar macro galvanic couple detection device 1; the corrosion state is monitored in real time, and the service life of the concrete structure is effectively predicted; after the anode 111 starts to corrode, the correlation between the macro current and the corrosion cracking time is further found by detecting the relationship between the macro current and the corrosion current density.
Claims (8)
1. A concrete internal steel bar macro galvanic couple real-time monitoring device is characterized by comprising a steel bar macro galvanic couple detection device (1) and an external receiving device (5); the steel bar macro galvanic couple detection device (1) consists of an anode (11), a cathode (12), a lead (13), a threading sleeve (14) and a sensor detector (15); the anode (11) is fixed on the insulating bracket (16) through an insulating adhesive by an anode (111), an anode (112), an anode (113), an anode (114), an anode (115) and an anode (116) in a step shape; the anode (11) and the cathode (12) are connected with a sensor detector (15) through a lead (13) passing through a threading sleeve (14); the anode (11), the cathode (12) and the sensor detector (15) are bonded and integrated into a whole through an insulating adhesive (17), are fixedly solidified near the transverse steel bar (2) or the longitudinal steel bar (3) in the concrete and are embedded in the concrete member (4); and data detected by the reinforcing steel bar macro galvanic couple real-time monitoring device (1) in the concrete are wirelessly transmitted to an external receiving device (5).
2. The device for monitoring the reinforced bar macro-galvanic couple in the concrete in real time according to claim 1, wherein the anode (11) consists of 6 anodes which are arranged in a step shape and are fixed on the insulating support (16) through the insulating glue (17) in a bonding way, wherein the anode (111), the anode (113), the anode (114), the anode (115) and the anode (116) are all columnar parts with the diameter smaller than that of the steel bar to be detected, the anode (12) is used for being close to the columnar parts of the steel bar to be detected and is arranged at the position near the steel bar to be detected, and one end of each anode is provided with an ear hole for connecting a lead and is communicated with the lead (13) through the ear hole.
3. The concrete internal reinforcement macro galvanic couple real-time monitoring device of claim 1, wherein the cathode (12) is a long columnar component, one end of which is provided with an ear hole for connecting a lead and is communicated with the lead (13) through the ear hole; the cathode (12) and the anode (11) are bonded by an insulating adhesive (17) to form a triangular pyramid shape.
4. The device for monitoring the reinforced bar macro galvanic couple in the concrete in real time as claimed in claim 1, wherein the conducting wire (13) is a connecting wire for transmitting the sensing state of each electrode to the sensor detector (15), one end of the conducting wire is connected with each electrode, and the other end of the conducting wire is connected with the sensor detector (15).
5. The device for monitoring the reinforced concrete galvanic couple in real time as claimed in claim 1, wherein the threading sleeve (14) is a means for protecting and restraining the running direction of the lead (13) buried in the concrete, and guiding the lead (13) from each electrode to the sensor detector (15).
6. The device for monitoring the reinforcement macro-galvanic couple in the concrete according to claim 1, wherein the sensor detector (15) is a device for analyzing and processing data transmitted from the anode (11) and the cathode (12), and is connected by a wire (13) during operation, and is integrated with the anode (11) and the cathode (12) into a whole to be buried in the concrete member (4).
7. The device for monitoring the reinforced concrete galvanic couple in real time as claimed in claim 1, wherein the external receiving device (5) collects data from the sensor detector (15) for monitoring the corrosion status in real time and effectively predicting the service life of the concrete structure.
8. The method for detecting the reinforced bar macro-galvanic couple real-time monitoring device in the concrete according to the claims 1 to 7, characterized in that after the steel bars are installed and accepted, the reinforced bar macro-galvanic couple detection device (1) is embedded near the transverse steel bars (2) or the longitudinal steel bars (3) in the concrete to be detected, the detected macro-battery current is the corrosion rate of the macro-battery reaction under specific conditions, and the detected data is wirelessly transmitted to an external receiving device (5) and can be used for long-term monitoring of the corrosion state of the steel bars.
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2019
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