CN110672506B - Potential automatic monitoring system for accelerated corrosion of steel bar in concrete - Google Patents
Potential automatic monitoring system for accelerated corrosion of steel bar in concrete Download PDFInfo
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- CN110672506B CN110672506B CN201910965965.7A CN201910965965A CN110672506B CN 110672506 B CN110672506 B CN 110672506B CN 201910965965 A CN201910965965 A CN 201910965965A CN 110672506 B CN110672506 B CN 110672506B
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- 230000007797 corrosion Effects 0.000 title claims abstract description 58
- 238000005260 corrosion Methods 0.000 title claims abstract description 58
- 238000012544 monitoring process Methods 0.000 title claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000012360 testing method Methods 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- 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
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention relates to an automatic potential monitoring system for accelerated corrosion of a steel bar in concrete, which comprises a water tank for placing a test block, a corrosion current loop for monitoring corrosion current in the test block, and a steel bar potential monitoring loop for monitoring the potential of the steel bar in the test block. The potential automatic monitoring system for accelerated corrosion of the steel bar in the concrete can realize automatic monitoring of the corrosion potential of the steel bar while an accelerated corrosion test is carried out, can ensure the accuracy of time in the test and can solve the technical defect that the potential test in the concrete at the initial stage of power failure in the existing test is unstable; the change of the potential of the steel bar after power failure is quantified: within 30min of potential monitoring, the potential is gradually stabilized from high to low and from positive to negative; and in the last 5min of monitoring, a steel bar corrosion instrument is used for carrying out potential measurement, the difference of multiple measurement results is less than 10mv, the standard requirement is met, the experimental result is accurate, and the reliability is high.
Description
Technical Field
The invention relates to an automatic potential monitoring system for accelerated corrosion of a steel bar in concrete, and belongs to the technical field of durability detection and monitoring of building structures.
Background
The accelerated corrosion test of the steel bar in the concrete can accurately reflect the working environment of a concrete structure, and is an important method for researching the corrosion of the steel bar in the concrete. The potential of the steel bar in the concrete is measured by a half-cell potential method, and represents the corrosion degree of the steel bar. The reinforcing steel bar corrosion potential measured by a half-cell potential method is specified in the building structure detection technical standard (GB/T50344-2004) of China: the potential is > -250, and the steel bar is not corroded; the potential is between-400 and-250, and the steel bar can be corroded; when the potential is less than-400, the steel bar is corroded. The steel bar corrosion instrument is used for manual determination, is suitable for determination of corrosion degree of steel bars in buildings, but cannot ensure the accuracy of time in a test, and meanwhile, whether the potential in concrete is stable or not cannot be known due to residual current in the concrete at the initial stage of test power failure.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an automatic potential monitoring system for accelerated corrosion of a steel bar in concrete, and the specific technical scheme is as follows:
the utility model provides an electric potential automatic monitoring system of reinforcing bar accelerated corrosion in concrete, is including the basin that is used for placing the test block, the corrosion current return circuit that is used for monitoring corrosion current in the test block, the reinforcing bar electric potential monitoring return circuit that is used for monitoring reinforcing bar electric potential in the test block.
According to the technical scheme, a positive ammeter and a negative ammeter are connected in series in the corrosion current loop, stainless steel bars connected in series with the negative electrode of each test block are placed in the same water tank, and the number of the positive ammeters is twice that of the negative ammeters; the steel bar potential monitoring loop comprises a reference electrode arranged at the position of the steel bar to be monitored and a voltmeter connected in series in the loop; the corrosion current loop and the reinforcing steel bar potential monitoring loop are mutually converted by an intermittent timer control relay, the corrosion current loop is connected with a normally closed contact of the relay, and the reinforcing steel bar potential monitoring loop is connected with a normally open contact of the relay; the process of the test is to carry out a 0.5-hour potential test after the accelerated corrosion is carried out for every 5.5 hours, namely the monitoring time of the test on the potential is 30min, and the potential at the end of 30min is taken as the corrosion potential of the steel bar.
The further optimization of the technical scheme also comprises a temperature control device for controlling the constant temperature of the water tank.
According to the technical scheme, the power supply used by the temperature control device is 220V alternating current, the temperature control device is connected into the normally closed contact of the relay, and when the normally open contact of the relay is connected, the temperature control equipment is in a disconnected state.
According to the further optimization of the technical scheme, the corrosion current loop is powered by a voltage stabilizing and current stabilizing power supply, and the voltage is 12V.
According to the further optimization of the technical scheme, each voltmeter in the steel bar potential monitoring loop is independently powered.
In the further optimization of the technical scheme, the reference electrode is a reference electrode which is in fluid connection with the microporous ceramic.
The invention has the beneficial effects that:
the potential automatic monitoring system for accelerated corrosion of the steel bar in the concrete can realize automatic monitoring of the corrosion potential of the steel bar while an accelerated corrosion test is carried out, can ensure the accuracy of time in the test and can solve the technical defect that the potential test in the concrete at the initial stage of power failure in the existing test is unstable; the change of the potential of the steel bar after power failure is quantified: within 30min of potential monitoring, the potential is gradually stabilized from high to low and from positive to negative; and in the last 5min of monitoring, a steel bar corrosion instrument is used for carrying out potential measurement, the difference of multiple measurement results is less than 10mv, the standard requirement is met, the experimental result is accurate, and the reliability is high.
Drawings
FIG. 1 is a schematic circuit diagram of an automatic potential monitoring system for accelerated corrosion of reinforcement in concrete according to the present invention;
FIG. 2 is a graph of potential change in an experiment;
FIG. 3 is a graph showing the change in corrosion potential.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figure 1, the automatic potential monitoring system for accelerated corrosion of the steel bar in the concrete comprises a water tank for placing a test block, a corrosion current loop for monitoring corrosion current in the test block, a steel bar potential monitoring loop for monitoring the potential of the steel bar in the test block, and a temperature control device for controlling the constant temperature of the water tank.
Take a set of tests (3 test blocks, 6 bars) as an example; the main body part of the test circuit consists of two loops, namely a corrosion current loop and a steel bar potential monitoring loop. The upper loop is a corrosion current loop, is powered by a voltage stabilizing and current stabilizing power supply, has the voltage of 12V, and is connected with a positive ammeter and a negative ammeter in series; because the stainless steel bars connected in series with the negative electrode of each test block are placed in the same water tank, 3 negative electrode ammeters and 6 positive electrode ammeters are provided. The lower loop is a reinforcing steel bar potential monitoring loop and consists of a reference electrode placed at the position of the reinforcing steel bar to be monitored and voltmeters connected in series in the loop, and in order to reduce mutual interference of the numerical values of the voltmeters, each voltmeter is independently supplied with power. In the test process, the two loops are controlled by the intermittent timer to carry out mutual conversion by the relay, the corrosion current loop is connected with the normally closed contact of the relay, and the reinforcing steel bar potential monitoring loop is connected with the normally open contact of the relay.
In order to reduce the influence of residual current in a test piece on monitoring of the potential of the steel bar after the corrosion current loop is closed, the potential test is carried out for 0.5 hour after accelerated corrosion is carried out for every 5.5 hours in the test process, namely the monitoring time of the test on the potential is 30min, and the potential at the end of 30min is taken as the corrosion potential of the steel bar.
The used power of temperature control device is the 220V alternating current, finds in the experiment when carrying out reinforcing bar electric potential monitoring, if temperature control equipment is in operating condition, can produce great influence to the electric potential monitoring, consequently inserts the normally closed contact of relay with temperature control equipment, and when the normally open contact of relay connects, temperature control equipment is in the off-state.
The reference electrode and the voltmeter are connected in series, the reference electrode is placed near the steel bar to be measured, a small water tank is arranged around the reference electrode, and the stability of the wetting degree of the concrete surface is kept.
In the test, the reference electrode is selected from the microporous ceramic liquid-connected reference electrode which can keep liquid leakage for one year, otherwise, the liquid leakage phenomenon is easy to occur.
Because the time of 30min is required for each automatic monitoring of the steel bars, 12h is added after the test finally, so that the corrosion time of each steel bar is ensured to be 120 h.
Fig. 2 shows the potential variation process of the test within 30min, and in the initial stage of the test, the potential is in a positive value due to the influence of the residual current of the reinforcement in the concrete, and in the first 5 minutes of the test, the residual current dissipates quickly and the potential varies quickly. Along with the increase of the test time, the potential value gradually decreases and tends to be stable, the test is carried out by using a steel bar corrosion instrument within the last 5 minutes of the test, the potential change in the steel bar corrosion instrument is small, the two test values can be less than 10mV, and the requirements of GBT50344-2004 can be met. In the figure, the color of the potential change curve represents the progression of the accelerated etching time from light to dark, and it can be found that the potential change tends to be stable. The automatic potential monitoring system for accelerated corrosion of the steel bar in the concrete can meet the requirement of potential monitoring.
FIG. 3 shows the concrete corrosion potential with time for three mix ratios of different rubber substitution, the water cement ratio of the test piece is 0.4, and the corrosive ambient temperature is 23 ℃. The corrosion potential of the steel reinforcement in the three test pieces tended to decrease with time. In the figure, the corrosion potential of the rubber substitution rate is the largest, the rubber substitution rate is 0.2, the smallest test piece is not mixed with rubber, the higher the rubber substitution rate is, the larger the corrosion potential is, the lighter the steel bar is corroded, and the characteristic of strong chloride ion resistance of rubber concrete is met, so that the reliability of the potential automatic monitoring system for accelerated corrosion of the steel bar in the concrete is further proved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. The utility model provides a potential automatic monitoring system that reinforcing bar corrodes with higher speed in concrete which characterized in that: the device comprises a water tank for placing a test block, a corrosion current loop for monitoring corrosion current in the test block, and a steel bar potential monitoring loop for monitoring the potential of a steel bar in the test block;
The corrosion current loop is connected in series with a positive electrode ammeter and a negative electrode ammeter, the stainless steel bars connected in series with the negative electrode of each test block are placed in the same water tank, and the number of the positive electrode ammeters is twice that of the negative electrode ammeters; the steel bar potential monitoring loop comprises a reference electrode arranged at the position of the steel bar to be monitored and a voltmeter connected in series in the loop; the corrosion current loop and the reinforcing steel bar potential monitoring loop are mutually converted by an intermittent timer control relay, the corrosion current loop is connected with a normally closed contact of the relay, and the reinforcing steel bar potential monitoring loop is connected with a normally open contact of the relay; the process of the test is implemented by carrying out a 0.5-hour potential test after accelerated corrosion is carried out for every 5.5 hours, namely the monitoring time of the test on the potential is 30min, and the potential at the end of 30min is taken as the corrosion potential of the steel bar;
the temperature control device is used for controlling the constant temperature of the water tank, a power supply used by the temperature control device is 220V alternating current, the temperature control device is connected with a normally closed contact of the relay, and when the normally open contact of the relay is connected, the temperature control device is in a disconnected state;
the corrosion current loop is powered by a voltage stabilizing and current stabilizing power supply, and the voltage is 12V;
each voltmeter in the reinforcing steel bar potential monitoring loop independently supplies power, and the reference electrode is selected from a reference electrode which is in micropore ceramic liquid connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910965965.7A CN110672506B (en) | 2019-10-12 | 2019-10-12 | Potential automatic monitoring system for accelerated corrosion of steel bar in concrete |
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| CN201910965965.7A CN110672506B (en) | 2019-10-12 | 2019-10-12 | Potential automatic monitoring system for accelerated corrosion of steel bar in concrete |
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| CN110672506A CN110672506A (en) | 2020-01-10 |
| CN110672506B true CN110672506B (en) | 2022-07-29 |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6390753A (en) * | 1986-10-03 | 1988-04-21 | Ohbayashigumi Ltd | Investigating method for corrosion state of reinforcing iron bar in reinforced concrete |
| CN201159716Y (en) * | 2008-02-19 | 2008-12-03 | 清华大学 | Device for fast assessing corrosion resistance of steel reinforced concrete |
| CN201965171U (en) * | 2011-03-03 | 2011-09-07 | 北京世纪洪雨科技有限公司 | Measuring device for electric current potential of macro cell |
| CN202486035U (en) * | 2012-02-27 | 2012-10-10 | 北京建筑材料科学研究总院有限公司 | Device for measuring macro current corrosion rate of steel bar in concrete |
| CN103217353B (en) * | 2013-03-21 | 2015-10-14 | 西南交通大学 | Employing Reinforcing Steel Bar In Reinforced Concrete Structure accelerating corrosion controls the method that monitoring device carries out controlling monitoring in real time |
| CN106198375B (en) * | 2016-07-06 | 2019-07-05 | 中国船舶重工集团公司第七二五研究所 | A kind of deep-sea multichannel corrosion electrochemistry in-situ testing device and its test method |
| CN206074418U (en) * | 2016-08-29 | 2017-04-05 | 江西科技学院 | The control of reinforcing bar accelerating corrosion and the device monitored in a kind of concrete component |
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