EP3724635A1 - Korrosionssensor und verfahren zum korrosionsmonitoring - Google Patents
Korrosionssensor und verfahren zum korrosionsmonitoringInfo
- Publication number
- EP3724635A1 EP3724635A1 EP18830740.9A EP18830740A EP3724635A1 EP 3724635 A1 EP3724635 A1 EP 3724635A1 EP 18830740 A EP18830740 A EP 18830740A EP 3724635 A1 EP3724635 A1 EP 3724635A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- corrosion
- rod
- magnetic field
- sensor
- ferromagnetic material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/04—Corrosion probes
Definitions
- the invention relates to a magnetic corrosion sensor and an associated method for corrosion monitoring and is particularly applicable for determining and monitoring the corrosion progress for reinforcements on reinforced concrete components.
- Corrosion progress in reinforced concrete or prestressed concrete is referred to as the progress of corrosive media in concrete.
- Corrosive media are chloride and other chemical substances that, in time, penetrate the concrete and corrode the rebar.
- the sensor or method associated with the present invention may also be used to detect corrosion in vehicle and shipbuilding, as well as in other industries where a ferromagnetic material is embedded in a nonferromagnetic surrounding material.
- a measuring device and a method for detecting and monitoring the corrosion of steel reinforcements is known from DE 102008050478 A1.
- the measuring device described here can monitor actual corrosion progress without destruction and transmit the information via radio.
- the disadvantage is that this device has a sensor with an electronic device arranged in the sensor housing and is not made robust enough for difficult construction sites.
- the steel wires at the device can be damaged by concreting work, for example, strong shaking, entering, backlash, even before concreting.
- the present invention has for its object to avoid the disadvantages of the known prior art and to provide a corrosion sensor and a method for corrosion monitoring, the realism of the corrosion progress in concrete and just monitor and enable years of economic monitoring in a robust system.
- a particular advantage of the invention consists in the simple and robust structural design of the corrosion sensor according to the invention, wherein the corrosion sensor has a corrosion rod and a reference rod, said corrosion rod and reference rod are designed geometrically identical and made of the same material as the Reinforcements exist and at the rod ends permanent magnets are arranged and the reference rod has a protective layer against corrosion.
- the rods of the magnetic corrosion sensor according to the invention consist of ordinary reinforcing steel and are embedded in the same concrete. Therefore, the identical corrosion process already occurs on the sensor before the structural reinforcements will corrode.
- the corrosion sensor is susceptible to all corrosion-causing media. By comparing the signal from the corrosion bar and the reference bar, the penetration depth of the corrosive media can be determined exactly.
- the magnetic property of the concrete is almost identical to that of a vacuum. Therefore, the chemical compositions of the concrete and the physical state of the concrete play a negligible role for the detection of the magnetic field and thus for the evaluation.
- the magnetic corrosion sensor is very robust. There are no special protective measures required for installation and concreting. The magnetic corrosion sensor according to the invention can therefore be produced very economically.
- a further advantage of the invention consists in the simple and reliable determination and monitoring of the corrosion progress for ferromagnetic reinforcements embedded in a non-ferromagnetic material, by the realization of the following method steps:
- An additional advantage of the invention is the effective detection of the magnetic field which takes place via the magnetic flux density and / or the magnetic field strength and / or the magnetic force of the corrosion rod and reference rod and / or the stray field of the permanent magnets.
- the monitoring of the magnetic field happens non-destructively with very little effort. For example, a repetitive study can be done annually by comparing the measurement results to determine the change in state.
- FIG. 1 shows the structural design of the magnetic corrosion sensor according to the invention
- FIG. 2 shows the positioning of the magnetic corrosion sensor according to the invention
- FIG. 3 shows the monitoring of corrosion progress by means of sensor carriages
- FIG. 4 shows the course of the magnetic flux density of a non-corroded rod
- Figure 5 shows the course of the magnetic flux density of a corroded rod.
- the magnetic corrosion sensor comprises an unprotected corrosion rod 1 and a protected reference rod 2.
- Rod-shaped permanent magnets 3 are arranged at the ends of the corrosion rod 1 and the reference rod 2, respectively.
- the corrosion rod 1 and the reference rod 2 is connected to a mounting frame 4.
- the unprotected corrosion rod 1 and the protected reference rod 2 are identical except for the difference that the protected reference rod 2 is painted against corrosion with a protective layer, for example of epoxy resin, on the surface. Both bars 1, 2 are parallel to each other. At both ends of the rods 1, 2 permanent magnets 3 are firmly adhered, for example, with epoxy resin or mounting adhesive. The surfaces of the magnets 3 are provided with a protective layer against corrosion. The permanent magnets 3 are arranged so that one end of the respective rod 1, 2 causes a north pole, the other end a south pole. The corrosion bar 1 and the reference bar 2 are bent at the center and firmly fixed to the fixing frame.
- the mounting frame 4 is on Reinforcements 5 fixed on the site, as can be seen from Figure 2.
- the apex 7a of the bend 7 of the corrosion sensor is arranged in the present exemplary embodiment 1 cm to 2 cm from the concrete surface.
- a magnetic field scanner arranged in the present embodiment as a sensor carriage 8 with wheels 8a on the surface of the concrete 6 and equipped with transducer, a sensor array 9 and a control unit with wireless communication function.
- the transducer measures the distance traveled by the wheel 8a.
- the sensor array 9 has magnetic field sensors positioned along a line.
- the control unit amplifies and digitizes the signals from the sensor array 9 and sends the measurement data to a display device 10 via radio.
- the display device 10 may be a computer or a smartphone (mobile device), which have a radio connection and adequate computing and display performance.
- the display device 10 displays the measurement result, for example, in a one-dimensional curve or in a two-dimensional magnetic image.
- the method for determining the corrosion progress is as follows.
- the corrosion sensor is mounted on the surface reinforcement and embedded in concrete.
- the depth of the peak or the apex 7a of the corrosion sensor is in the range of 0.5 cm to 10 cm. For an optimum determination of the corrosion state, this depth is recommended in the range of 1 cm to 3 cm and in the present exemplary embodiment is 2 cm.
- the corrosion bar 1 Since the corrosion bar 1 is made of the same steel as the normal reinforcement 5 and installed in the same concrete 6, the corrosion bar 1 practically simulates the same corrosion process which will take place later in the reinforcement 5.
- the handy magnetic field scanner moves in the present embodiment as a sensor carriage 8 on the concrete surface transverse to the corrosion and reference rod 1, 2 and detects the magnetic field on the surface of the concrete 6.
- the rods 1, 2 act like bar magnets.
- the magnetic field from the corrosion rod 1 and the reference rod 2 is detected by means of the magnetic field scanner and evaluated in the display device 10.
- the signal of the corrosion bar 1 is compared with the signal of the protected non-corroded reference bar 2. As a result, the accuracy is increased.
- the present invention is not limited to the features and method steps shown here. Rather, it is possible to realize by combining the mentioned means and features and method steps further embodiments, without departing from the scope of the invention.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017129573.9A DE102017129573A1 (de) | 2017-12-12 | 2017-12-12 | Korrosionssensor und Verfahren zum Korrosionsmonitoring |
PCT/EP2018/084151 WO2019115451A1 (de) | 2017-12-12 | 2018-12-10 | Korrosionssensor und verfahren zum korrosionsmonitoring |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3724635A1 true EP3724635A1 (de) | 2020-10-21 |
Family
ID=65009668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18830740.9A Pending EP3724635A1 (de) | 2017-12-12 | 2018-12-10 | Korrosionssensor und verfahren zum korrosionsmonitoring |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3724635A1 (de) |
DE (1) | DE102017129573A1 (de) |
WO (1) | WO2019115451A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3111426B1 (fr) * | 2020-06-16 | 2022-12-16 | Cerema | Témoin de corrosion magnétique |
CN113466115B (zh) * | 2021-06-18 | 2022-07-19 | 燕山大学 | 一种具有温度自补偿的钢筋腐蚀监测装置 |
FR3130375A1 (fr) * | 2021-12-15 | 2023-06-16 | Cerema | Procédé de détection de corrosion et d’évaluation d’infiltration par mesure de valeur d’une caractéristique magnétique. |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000039423A (ja) * | 1998-05-19 | 2000-02-08 | Topy Ind Ltd | 欠陥診断方法とその装置 |
DE102008050478A1 (de) | 2008-10-04 | 2010-04-29 | Selfsan Consult Gmbh | Messvorrichtung zur Überwachung der Korrosion einer Stahlarmierung |
DE102009029914A1 (de) * | 2009-06-19 | 2010-12-23 | Rheinisch-Westfälische Technische Hochschule Aachen | Verfahren und Vorrichtung zur Bestimmung der Lage von Korrosionsstellen in bewehrtem Beton |
ITMI20121595A1 (it) * | 2012-09-25 | 2014-03-26 | St Microelectronics Srl | Manufatto di materiale di costruzione |
JP6452130B2 (ja) * | 2015-03-13 | 2019-01-16 | 株式会社三井E&Sマシナリー | 線状部材の診断装置及び診断方法 |
-
2017
- 2017-12-12 DE DE102017129573.9A patent/DE102017129573A1/de active Pending
-
2018
- 2018-12-10 EP EP18830740.9A patent/EP3724635A1/de active Pending
- 2018-12-10 WO PCT/EP2018/084151 patent/WO2019115451A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
WO2019115451A1 (de) | 2019-06-20 |
DE102017129573A1 (de) | 2019-06-13 |
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