CN115265354A - Reinforced concrete structure corrosion depth monitoring device and using method thereof - Google Patents
Reinforced concrete structure corrosion depth monitoring device and using method thereof Download PDFInfo
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- 230000007797 corrosion Effects 0.000 title claims abstract description 48
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 23
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 12
- 239000000919 ceramic Substances 0.000 claims abstract description 95
- 238000012544 monitoring process Methods 0.000 claims abstract description 81
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- 238000012360 testing method Methods 0.000 claims abstract description 41
- 239000004567 concrete Substances 0.000 claims abstract description 32
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 10
- 239000011241 protective layer Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 5
- 239000004809 Teflon Substances 0.000 claims description 4
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- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
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- 239000000835 fiber Substances 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/26—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring depth
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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
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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Abstract
The invention relates to a reinforced concrete structure corrosion depth monitoring device and a using method thereof, the device comprises a conductive ceramic resistance sensor, a monitoring interface device and a lead, wherein the conductive ceramic resistance sensor is composed of a steel test piece and a plurality of conductive ceramic electric plates, first interfaces of the plurality of conductive ceramic electric plates are respectively connected with different resistance positions of the steel test piece, an electric plate protection box is arranged outside the connection position, and second interfaces of the plurality of conductive ceramic electric plates extend into concrete and are respectively connected with the monitoring interface device through the lead; the monitoring interface device comprises a support frame and a plurality of monitoring end conductive ceramic electric plates arranged on the lower side of the support frame, the support frame comprises an embedded part and an exposed part, a plurality of measuring contacts are arranged on the upper side of the exposed part, the inner side ends of the monitoring end conductive ceramic electric plates are respectively connected with corresponding leads, and the outer side ends of the monitoring end conductive ceramic electric plates are respectively connected with the corresponding measuring contacts through the support frame. The device is favorable for carrying out long-term stable monitoring on the reinforced concrete structure.
Description
Technical Field
The invention belongs to the field of civil engineering structure monitoring, and particularly relates to a reinforced concrete structure corrosion depth monitoring device and a using method thereof.
Background
Coastal engineering structures such as cross-sea bridges and port wharves are in complex environments and are influenced by adverse factors such as rising and falling tide, wave beating, alternation of dry and wet environments, sand and stone washing, high salt mist, wind blowing and the like all the year round, so that the performance of structural materials is deteriorated along with time, and the durability and safety of the structures are influenced.
For reinforced concrete structures, carbonization and peeling of the concrete protective layer and corrosion of the steel bars caused by corrosion are main factors influencing the durability of the structure. The concrete carbonization and the chloride ion corrosion are important reasons of the corrosion of the steel bars, and directly influence the safety of the structure. Therefore, the hidden danger possibly causing the corrosion of the steel bars can be discovered as early as possible by effective monitoring means in reality so as to take measures to take targeted prevention. Compared with the method of carrying out anticorrosive treatment after the reinforcing steel bar begins to corrode, the maintenance cost in the service life cycle of the structure is lower, and the maintenance effect on safety and durability is better.
In recent years, various forms of concrete structure corrosion monitoring and detecting devices have been researched and developed at home and abroad, but most of the devices are complex and have high manufacturing cost. Most of the existing sensors contain easily-corroded metals and electronic components, and are easily corroded in a high-salt-mist repeated infiltration area environment for a long time, so that whether measured data are correct or not can not be guaranteed, the subsequent bridge safety analysis is seriously influenced, and even wrong judgment can be made.
The traditional detection methods comprise a core drilling sampling method, a half-cell potential method, a linear polarization method, a macro-current method, a pulse current method and the like, and the latter methods are used for electrochemical sensors. The core drilling sampling method can accurately measure the corrosion rate of the steel bar, but can damage the integrity of the structure; the electrochemical testing technology has small influence on the structure, the measuring principle is mature, the measuring result is more reliable theoretically, but the requirement of the sensor on the internal environment is higher, and the reliability of the detecting result is extremely easy to be influenced by the quality of the circuit and the surrounding environment. The newer corrosion monitoring technology can adopt a fiber grating sensor, and has better corrosion resistance than the traditional electrochemical sensor. However, as the geometrical size of the coastal reinforced concrete structure is large, the difference of the corrosion degree of the interior is large, the corrosion condition of each part is influenced by the structure of the sensor, construction or external environment, and meanwhile, the encapsulation of the sensor also has certain influence on corrosion monitoring.
Aiming at corrosion monitoring of coastal reinforced concrete structures, higher requirements are provided for the corrosion resistance and the measurement stability of the sensor in the infiltration area, so that a corrosion sensor with the durability and the precision meeting the requirements needs to be developed.
Disclosure of Invention
The invention aims to provide a reinforced concrete structure corrosion depth monitoring device and a using method thereof, and the device is beneficial to long-term stable monitoring of a reinforced concrete structure.
In order to achieve the purpose, the invention adopts the technical scheme that: a reinforced concrete structure corrosion depth monitoring device comprises a conductive ceramic resistance sensor, a monitoring interface device and a conducting wire, wherein the conductive ceramic resistance sensor is arranged in a concrete protective layer area before structure pouring, the monitoring interface device is arranged in a drying area or a position convenient for detection, and the structure is poured after the whole device is installed; the conductive ceramic resistance sensor is composed of a steel test piece and a plurality of conductive ceramic electric plates, the steel test piece is provided with a plurality of different resistance positions, first interfaces of the conductive ceramic electric plates are respectively connected with the different resistance positions of the steel test piece, electric plate protection boxes are arranged outside the connection parts of the first interfaces of the conductive ceramic electric plates and the different resistance positions of the steel test piece, and second interfaces of the conductive ceramic electric plates extend into concrete and are respectively connected with a monitoring interface device along the arrangement direction of reinforcing steel bars through wires; the monitoring interface device comprises a support frame and a plurality of monitoring end conductive ceramic electric plates, wherein the support frame comprises an embedded part embedded in concrete and an exposed part exposed in an external environment, a plurality of measuring contacts are arranged on the upper side of the exposed part of the support frame, the plurality of monitoring end conductive ceramic electric plates are arranged on the lower side of the support frame, the inner ends of the monitoring end conductive ceramic electric plates are respectively connected with corresponding wires, and the outer ends of the monitoring end conductive ceramic electric plates are respectively connected with corresponding measuring contacts through the support frame.
Furthermore, the first interface of the conductive ceramic electric plate is connected with different resistance levels of the steel test piece through a screw buckle; the second interface of the conductive ceramic electric plate is connected with the lead through a screw buckle; the outer side end of the monitoring end conductive ceramic electric plate is connected with the measuring contact through a screw buckle.
Furthermore, the conductive ceramic electric plate of the conductive ceramic resistance sensor, the monitoring end conductive ceramic electric plate of the conductive ceramic monitoring interface device and the screw buckle are all made of silicon carbide conductive ceramic materials.
Further, the wire is a Teflon wire.
Further, the electric board protection box is filled with epoxy resin to further seal the circuit structure.
Furthermore, the embedded part to the exposed part of the support frame are inclined downwards by a set angle and used for rapid drainage in rainy and snowy weather.
Furthermore, the low resistance position of the steel test piece is close to the surface of concrete, and the high resistance position is close to the stressed steel bar.
Further, electrically conductive ceramic resistance sensor is used for the ligature fixed through an overhanging reinforcing bar of overlap joint on the inside reinforcing bar of structure, and overhanging reinforcing bar is no longer than the steel test block.
The invention also provides a using method of the reinforced concrete structure corrosion depth monitoring device, which is used for any part to be detected of the reinforced concrete structure; firstly, before the structure is poured, the conductive ceramic resistance sensor is arranged in a concrete protective layer interval, the low resistance position of a steel test piece is close to the surface of concrete, the high resistance position of the steel test piece is close to a stressed steel bar, an overhanging steel bar is lapped on a steel bar in the structure and used for binding and fixing the conductive ceramic resistance sensor, and the overhanging steel bar does not exceed the steel test piece;
the interface of the conductive ceramic resistance sensor points to the inside of the concrete, then the interface of the conductive ceramic resistance sensor is connected by a lead and is distributed to a monitoring interface device along the reinforcing steel bar;
installing a monitoring interface device: firstly, mounting a support frame of the monitoring interface device in a drying area or a position convenient for detection, embedding one part of the support frame into concrete, exposing the rest part of the support frame in an external environment, and binding and fixing the support frame by adopting a fixing method which is the same as that of a sensor, namely, overlapping an overhanging reinforcing steel bar on the reinforcing steel bar;
installing a monitoring end conductive ceramic electric plate at the lower side of the support frame, wherein the inner side ends of the monitoring end conductive ceramic electric plates are respectively connected with corresponding leads, and the outer side ends of the monitoring end conductive ceramic electric plates are respectively connected with a measuring contact at the upper side of the support frame through the support frame and are used for monitoring contacts;
pouring a structure after the whole device is installed; after pouring is finished, monitoring whether the detection circuits of the high resistance level and the low resistance level are normal by using a universal meter, and simultaneously acquiring the resistance value in the initial state by using a resistance measuring instrument; the corrosion depth and the corrosion rate are judged by monitoring the resistance change of the high resistance bit and the low resistance bit for a long time.
Compared with the prior art, the invention has the following beneficial effects: the device carries out corrosion monitoring based on the conductive ceramic resistance sensor, has better corrosion resistance, more stable performance and lower cost; the circuit board can be customized according to needs, has good compression resistance, has small influence on a concrete structure after being embedded into a measurement part, and has good engineering applicability. The conductive ceramic resistance sensor of the device has simple structure, is not easy to damage, and is convenient to construct and install. The device fully exposes the steel test piece to be corroded in a corrosive environment, and ensures the stability and reliability of the measurement result.
Drawings
Fig. 1 is a schematic view of an installation structure of a corrosion depth monitoring device for a reinforced concrete structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a conductive ceramic resistance sensor according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a support frame of the monitor interface device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a conductive ceramic electroplate at a monitoring end of the monitoring interface device in an embodiment of the present invention;
fig. 5 is a schematic diagram of the corrosion depth monitoring device for the reinforced concrete structure in the embodiment of the invention.
In the figure: 1-steel test piece; 2-epoxy resin sealant; 3-a silicon carbide conductive ceramic electrode; 4-an electric board protection box; 5. 6, 7-second interfaces of the low, medium and high resistance position conductive ceramic electric plates; 8. 9, 10-first interface of low, middle and high resistance position conductive ceramic electric plate; 11-screw buckling; 100-conductive ceramic resistance sensor; 200-monitoring the interface device; 300-teflon conductor.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure herein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiment provides a reinforced concrete structure corrosion depth monitoring device, and the device design strives for simple structure, and parts are not fragile under high salt and high humidity and complicated load environment simultaneously to realize the long-term stable monitoring to reinforced concrete structure. As shown in fig. 1 to 5, the device includes a conductive ceramic resistance sensor 100, a monitoring interface device 200 and a wire 300, wherein the conductive ceramic resistance sensor 100 is placed in a concrete protective layer interval before the structure is poured, the monitoring interface device 200 is arranged in a dry area or a position convenient for detection, and the structure is poured after the whole device is installed. The conductive ceramic resistance sensor 100 is composed of a steel test piece 1 and a plurality of conductive ceramic electric plates 3, the steel test piece 1 can be provided with a plurality of different resistance positions according to engineering requirements, first interfaces of the conductive ceramic electric plates 3 are respectively connected with the different resistance positions of the steel test piece 1, electric plate protection boxes 4 are arranged outside the connection parts of the first interfaces of the conductive ceramic electric plates 3 and the different resistance positions of the steel test piece 1, and second interfaces of the conductive ceramic electric plates extend into concrete and are respectively connected with monitoring interface devices along the arrangement direction of reinforcing steel bars through leads; the monitoring interface device 200 comprises a support frame 201 and a plurality of monitoring end conductive ceramic electric plates 202, wherein the support frame 201 comprises an embedded part embedded in concrete and an exposed part exposed in an external environment, a plurality of measuring contacts 203 are arranged on the upper side of the exposed part of the support frame 201, the plurality of monitoring end conductive ceramic electric plates 202 are arranged on the lower side of the support frame, the inner side ends of the plurality of monitoring end conductive ceramic electric plates are respectively connected with corresponding leads, and the outer side ends of the plurality of monitoring end conductive ceramic electric plates are respectively connected with the corresponding measuring contacts 203 through the support frame 201.
In the principle of measurement, the conductive ceramic sensor utilizes the resistance change caused by the cross-sectional area change of a steel test piece in the sensor to realize the quantification of the corrosion depth. If the corrosion of the concrete in the monitored area is substantially uniform, the resistance change of the sensor is proportional to the corrosion increase. The corrosion degree can be known from the change of the resistance value measured each time, and the corrosion rate can be calculated by measuring periodically. When in use, the resistance R before corrosion needs to be accurately measured after the sensor is installed0And post-corrosion resistance R1And then, calculating the corrosion amount according to the resistance change value delta R before and after corrosion:
wherein Δ R is the resistance change of the steel test piece, R0Is an original resistance value, R1For measuring resistance after etching, M0To the original mass, M1For post-etch quality, A0The cross-sectional area of the original specimen, A1The cross-sectional area of the test piece after etching. The corrosion amount is calculated according to the formula (1), and the corrosion rate can be further calculated according to the recorded information such as time.
In this embodiment, the first interface of the conductive ceramic electric plate is connected with different resistance levels of the steel test piece by a screw fastener; the second interface of the conductive ceramic electric plate is connected with a lead through a screw buckle 11; the outer side end of the monitoring end conductive ceramic electric plate is connected with the measuring contact through a screw buckle.
In this embodiment, the conductive ceramic electrode of the conductive ceramic resistor sensor 100, the monitoring end conductive ceramic electrode of the conductive ceramic monitoring interface device, and the screw fastener are all made of a silicon carbide conductive ceramic material.
In this embodiment, the conductive wire 300 is a teflon conductive wire.
In this embodiment, the electrical board protection box is filled with epoxy resin 2 to further seal the circuit structure.
In this embodiment, the embedded portion of the support frame is inclined downward to the exposed portion by a set angle, that is, the difference between the heights of two points of the longitudinal slope of the layout of the support frame/the horizontal distance of two points (2 to 5% in this embodiment), and is used for rapid drainage in rainy and snowy weather, and the extension length can be set as required.
In this embodiment, the low resistance position of the steel test piece is close to the concrete surface, and the high resistance position is close to the stressed steel bar. As shown in fig. 2, if the point labeled 5 is the initial point of measurement, and the point labeled 6 is selected as the measurement loop, the distance between the steel test piece at the point 6 and the point 5 is short, and the part of the steel test piece in the measurement loop is the low resistance position. And if the point marked 7 is selected as a measuring loop, the position of the inner steel test piece is a high resistance position.
In this embodiment, the conductive ceramic resistance sensor is used for binding and fixing by overlapping an overhanging steel bar on the steel bar inside the structure. Overhanging reinforcing bar is no longer than steel test piece, and its purpose is in order to guarantee that the steel test piece is fully wrapped up by the corrosion environment in the concrete on every side, avoids overhanging reinforcing bar to influence the environment of the protective layer concrete that awaits measuring.
The invention also provides a using method of the reinforced concrete structure corrosion depth monitoring device, which is used for any part to be detected (such as a pier repeated infiltration area, a deepwater area and the like) of the reinforced concrete structure. The method comprises the following steps:
firstly, before the structure is poured, the conductive ceramic resistance sensor is arranged in a concrete protective layer interval, the low resistance position of a steel test piece is close to the surface of concrete, the high resistance position of the steel test piece is close to a stressed steel bar, an overhanging steel bar is lapped on a steel bar in the structure and used for binding and fixing the conductive ceramic resistance sensor, and the overhanging steel bar does not exceed the steel test piece;
the interface of the conductive ceramic resistance sensor points to the inside of the concrete, then the interface of the conductive ceramic resistance sensor is connected by a lead and is distributed to a monitoring interface device along the reinforcing steel bar;
installing a monitoring interface device: firstly, mounting a support frame of the monitoring interface device in a drying area or a position convenient for detection, embedding one part of the support frame into concrete, exposing the rest part of the support frame in an external environment, and binding and fixing the support frame by adopting a fixing method which is the same as that of a sensor, namely, overlapping an overhanging reinforcing steel bar on the reinforcing steel bar;
mounting a monitoring end conductive ceramic electric plate on the lower side of the support frame, wherein the inner side ends of the monitoring end conductive ceramic electric plate are respectively connected with corresponding leads, and the outer side ends of the monitoring end conductive ceramic electric plate are respectively connected with a measuring contact on the upper side of the support frame through the support frame and are used for monitoring contacts;
pouring a structure after the whole device is installed; after pouring is finished, monitoring whether the detection circuits of the high resistance level and the low resistance level are normal by using a universal meter, and simultaneously acquiring the resistance value in the initial state by using a resistance measuring instrument; the corrosion depth and the corrosion rate are judged by monitoring the resistance change of the high resistance bit and the low resistance bit for a long time.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. A reinforced concrete structure corrosion depth monitoring device is characterized by comprising a conductive ceramic resistance sensor, a monitoring interface device and a wire, wherein the conductive ceramic resistance sensor is arranged in a concrete protective layer area before structure pouring, the monitoring interface device is arranged in a drying area or a position convenient for detection, and the structure is poured after the whole device is installed; the conductive ceramic resistance sensor is composed of a steel test piece and a plurality of conductive ceramic electric plates, the steel test piece is provided with a plurality of different resistance positions, first interfaces of the conductive ceramic electric plates are respectively connected with the different resistance positions of the steel test piece, electric plate protection boxes are arranged outside the connection parts of the first interfaces of the conductive ceramic electric plates and the different resistance positions of the steel test piece, and second interfaces of the conductive ceramic electric plates extend into concrete and are respectively connected with a monitoring interface device along the arrangement direction of reinforcing steel bars through leads; the monitoring interface device comprises a support frame and a plurality of monitoring end conductive ceramic electric plates, wherein the support frame comprises an embedded part embedded in concrete and an exposed part exposed in an external environment, a plurality of measuring contacts are arranged on the upper side of the exposed part of the support frame, the plurality of monitoring end conductive ceramic electric plates are arranged on the lower side of the support frame, the inner ends of the monitoring end conductive ceramic electric plates are respectively connected with corresponding wires, and the outer ends of the monitoring end conductive ceramic electric plates are respectively connected with corresponding measuring contacts through the support frame.
2. The apparatus for monitoring corrosion depth of reinforced concrete structure of claim 1, wherein the first interface of the conductive ceramic electric plate is connected with the different resistance levels of the steel test piece by screws; the second interface of the conductive ceramic electric plate is connected with the lead through a screw buckle; and the outer side end of the monitoring end conductive ceramic electric plate is connected with the measuring contact through a screw buckle.
3. The apparatus of claim 2, wherein the conductive ceramic plate of the conductive ceramic resistor sensor, the monitoring end conductive ceramic plate of the conductive ceramic monitoring interface device and the screw fastener are made of silicon carbide conductive ceramic material.
4. The apparatus as claimed in claim 1, wherein the conductive wire is a Teflon conductive wire.
5. The device of claim 1, wherein the electrical board protection box is filled with epoxy resin to further seal the circuit structure.
6. The apparatus of claim 1, wherein the support frame is provided with an insertion portion inclined downward to an exposed portion at a predetermined angle for rapid drainage of water in rainy and snowy weather.
7. The apparatus of claim 1, wherein the steel strip has a low resistance near the concrete surface and a high resistance near the stressed steel bar.
8. The apparatus of claim 1, wherein the conductive ceramic resistance sensor is fixed by bonding an overhanging steel bar on the steel bar inside the structure, and the overhanging steel bar does not exceed the steel test piece.
9. The use of the apparatus for monitoring the corrosion depth of a reinforced concrete structure according to any one of claims 1 to 8, wherein the apparatus is used for any part of a reinforced concrete structure to be measured; firstly, before the structure is poured, the conductive ceramic resistance sensor is arranged in a concrete protective layer interval, the low resistance position of a steel test piece is close to the surface of concrete, the high resistance position of the steel test piece is close to a stressed steel bar, an overhanging steel bar is lapped on a steel bar in the structure and used for binding and fixing the conductive ceramic resistance sensor, and the overhanging steel bar does not exceed the steel test piece;
the interface of the conductive ceramic resistance sensor points to the inside of the concrete, then the interface of the conductive ceramic resistance sensor is connected by a lead and is distributed to a monitoring interface device along the reinforcing steel bar;
installing a monitoring interface device: firstly, mounting a support frame of the monitoring interface device in a drying area or a position convenient for detection, embedding one part of the support frame into concrete, exposing the rest of the support frame in an external environment, and binding and fixing the support frame by adopting a fixing method which is the same as that of a sensor, namely, overlapping an overhanging steel bar on the steel bar;
installing a monitoring end conductive ceramic electric plate at the lower side of the support frame, wherein the inner side ends of the monitoring end conductive ceramic electric plates are respectively connected with corresponding leads, and the outer side ends of the monitoring end conductive ceramic electric plates are respectively connected with a measuring contact at the upper side of the support frame through the support frame and are used for monitoring contacts;
pouring a structure after the whole device is installed; after the pouring is finished, monitoring whether the detection circuits of the high resistance level and the low resistance level are normal by using a universal meter, and simultaneously obtaining the resistance value in the initial state by using a resistance measuring instrument; the corrosion depth and the corrosion rate are judged by monitoring the resistance change of the high resistance bit and the low resistance bit for a long time.
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