CN104502263B - Steel and concrete structure cathodic corrosion control anode material acceleration test apparatus and life-span prediction method - Google Patents
Steel and concrete structure cathodic corrosion control anode material acceleration test apparatus and life-span prediction method Download PDFInfo
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- CN104502263B CN104502263B CN201410772956.3A CN201410772956A CN104502263B CN 104502263 B CN104502263 B CN 104502263B CN 201410772956 A CN201410772956 A CN 201410772956A CN 104502263 B CN104502263 B CN 104502263B
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Abstract
A kind of steel and concrete structure cathodic corrosion control anode material acceleration test apparatus and life-span prediction method, the acceleration test apparatus are made up of test reactor, working electrode, auxiliary electrode, reference electrode, fixed value resistance, electrolyte solution and universal meter, the center side of test reactor opens square hole, and working electrode is placed in hole；Working electrode is made up of cast concrete base, anode material, graphite column and wire, cast concrete base is immersed in electrolyte solution, and anode material is laid on cast concrete base upper surface, one end centre drill circular hole of graphite column, wire is placed in circular hole and seals, other end insertion anode material geometric center；Fixed value resistance, working electrode, electrolyte solution and auxiliary electrode constitute polarization loop, and reference electrode, universal meter and working electrode constitute measuring loop.The present invention current load is born in accelerated aging tester based on anode material, can Accurate Estimation go out service life of the anode material in steel and concrete structure cathodic corrosion control system.
Description
Technical field
Reinforced concrete structure impressed current cathodic corrosion control system institute can be exactly predicted the present invention relates to one kind
The test method predicted with the acceleration test apparatus and service life of anode material.
Background technology
Steel and concrete structure be now and later for a long time in one of the primary structure pattern that will use, reinforcement corrosion is to cause
The main reason of steel and concrete structure durability reduction.World's corrosion structure in 2009（WCO）Statistics show, the whole world due to
The economic loss that corrosion is caused is more than 2.2 trillion dollars/year.In the recent period, China has put into fund development of the number in terms of trillion again
Infrastructure construction, occupies the great steel and concrete structure endurance issues of significant proportion, certainly will turn into influence the national economic development and
The strategic problem of social harmony stabilization.The harm of reinforcement corrosion is big far beyond expection, with global climate and environment
Further deteriorate, this problem certainly will show the serious situation increasingly sharpened, and great steel and concrete structure corrosion of reinforcing steel bar just draws
Play mondial close attention.
Highway Administration of the United States Federal（FHWA）, U.S. Department of Defense（DOD）, NACE（NACE）, Europe
Corrode federation in continent（EFC）And corrosion association of Australia（ACA）Deng big to the U.S., Canada, Denmark, Norway, Switzerland, meaning
Profit, Holland, Australia, India, Japan and South Korea etc. are civilian with more than 8600 military bridge blocks, more than 1500 bar tunnels, more than 160
More than 200 part survey reports of the infrastructure such as place's nuclear waste srorage structure show, using cathodic protection（CP）Technology, is to show
Write alleviate steel and concrete structure reinforcement corrosion, and then extending structure service life most effective approach.Substantial amounts of survey report shows：
More than 12000 set impressed current cathodic corrosion controls（ICCP）Common problem present in system is that effective service life is shorter（It is flat
It is 15 ± 5 years）, so that the income of ICCP systems is relatively low with input ratio.And the quick aging of anode material is to cause
One of main reason of ICCP failures.
Obviously, if the service life of the anode material that can calculate to a nicety out, provided without the design suspected of ICCP systems
Strong data supporting so that the design of ICCP system service lifes is more reasonable, while to ICCP systems in reinforced concrete
The assessment of more science is made in application in soil structure, and then to carrying out the armored concrete knot of corrosion control using ICCP systems
The durability of structure makes the assessment of more science.
The content of the invention
Reinforced concrete structure impressed current cathodic corrosion control system can be predicted it is an object of the invention to provide one kind
System anode material acceleration test apparatus used and the test method of service life prediction.
The purpose of the present invention is achieved by the following technical solution：
Anode material acceleration test apparatus are used in a kind of steel and concrete structure cathodic corrosion control, by test reactor, working electrode,
Auxiliary electrode, reference electrode, fixed value resistance, electrolyte solution and universal meter are constituted, and a certain center side of test reactor is opened
Hole, working electrode is placed in hole, and surrounding is sealed with glass cement；The working electrode is by cast concrete base, anode material, graphite column
Constituted with wire, cast concrete base is immersed in electrolyte solution, and anode material is laid on cast concrete base upper surface, graphite column
One end center be drilled with circular hole, wire is placed in circular hole and is sealed with epoxy type conductive silver glue, and the other end of graphite column is inserted
Enter the geometric center of anode material；Fixed value resistance, working electrode, electrolyte solution and auxiliary electrode constitute polarization loop, reference
Electrode, universal meter and working electrode constitute measuring loop.
A kind of life-span prediction method of steel and concrete structure cathodic corrosion control anode material, comprises the following steps：
First, to electrolyte solution is added in test reactor, cast concrete base is at least soaked 7 days in electrolyte solution.
2nd, constant current Accelerated polarization experiment is carried out using three-electrode system, controls constant current for 50mA, polarized current density
It is 20000mA/m2, when lasting ascent stage occurs in polarization potential, show now anode material destroyed, stop experiment number
According to collection, the polarization time before record appearance ascendant trend of the anode material in Accelerated polarization experimental rig, this in stage institute
When the polarization time of experience is the military service of anode material normal working time, i.e. anode material in this accelerated ageing environment
Between.
3rd, the anode material normal working hours for being recorded according to step 2 and the electric current for acting on unit area anode material
Load, calculates service life of the anode material in reinforced concrete structure cathodic corrosion control system.
In the present invention, the anode material is the anode material of steel and concrete structure impressed current cathodic corrosion control.In reality
It is the anode material on the surface for being layed in concrete, such as cement base composite anode materials, polymer matrix composite anode material in engineering
Material etc., should be different from embedded anode material.
General principle of the invention is as follows：
The anode material that will be laid on concrete surface is placed in acceleration test apparatus, under the polarization of constant current,
Active time of the anode material in this accelerated ageing environment is drawn, then according to the electricity for acting on unit area anode material
Stream load calculates service life of the anode material in reinforced concrete structure cathodic corrosion control system.
The present invention gives the method for experimental rig, required testing equipment, test principle and anode material life prediction.
By in experimental rig of the invention, Accelerated polarization, final foundation being carried out according to given test principle and test method
The current load that anode material is born under Accelerated polarization environmental activity, calculates military service of the anode material in Practical Project
The time limit.The present invention has advantages below：
1st, the voltage at test fixed value resistance two ends, is easy to the polarized current density in time to flowing through anode material to supervise
Survey and adjust
2nd, in acceleration test apparatus of the invention and test method, using high current density, so as to significantly drop
The low test period.
3rd, current load is born in accelerated aging tester based on anode material, can Accurate Estimation go out anode material
Expect the service life in steel and concrete structure cathodic corrosion control system.
Brief description of the drawings
Fig. 1 is the experimental rig schematic diagram of Accelerated polarization；
Fig. 2 is working electrode organigram；
In figure：1- plexiglass box, 2- auxiliary electrodes, 3- electrolyte solutions, 4- reference electrodes, 5- working electrodes, 6-
Power supply（0-150V, 0-1A）, 7- fixed value resistances, 8- cast concrete bases, 9- anode materials, 10- graphite columns, 11- wires, 12- rings
Oxygen type conductive silver glue.
Specific embodiment
Technical scheme is further described below in conjunction with the accompanying drawings, but is not limited thereto, it is every to this
Inventive technique scheme is modified or equivalent, without deviating from the spirit and scope of technical solution of the present invention, all should be covered
In protection scope of the present invention.
It is pre- the invention provides a kind of acceleration test apparatus of steel and concrete structure cathodic corrosion control anode material and life-span
Acceleration test apparatus and Forecasting Methodology are illustrated by survey method one by one below.
1st, acceleration test apparatus
As shown in figure 1, the plexiglass box 1 that test reactor is used, its internal diameter size is 100 × 100 × 100mm,
The square hole of 50 × 50mm of physical dimension is opened in its a certain center side, then working electrode 5 is placed in hole, surrounding glass
Glass glue is sealed.In order to reduce the resistance of cast concrete base 8, after after glass cement solidification, electrolyte is added in plexiglass box 1
Solution 3, Accelerated polarization experiment can be carried out after cast concrete base 8 is soaked 7 days.
The three-electrode system of classics is taken in Accelerated polarization experiment.The manufacturing process of working electrode 5 (WE)：The first step, makes
The graphite column 10 of a diameter of 5mm, a height of 8mm, in the circular hole that the bottom center's drill diameter of graphite column 10 is 2mm, depth 4mm, by wire
11 are placed in circular hole, are sealed and are fixed with epoxy type conductive silver glue 12, such that it is able to avoid directly being connected with anode material 9
The corrosion of wire 11 fall, while electric current can be uniformly introduced in anode material 9 again.Second step, by required test anode material
Material 9 is laid on physical dimension for the upper surface of 50 × 50 × 20mm cast concrete bases 8, and the laying depth of anode material 9 is 5mm.3rd
Step, the graphite column 10 that step one is made inserts the geometric center of anode material 9, and outwardly, its organigram is shown in figure to conductor wire end
2.Auxiliary electrode 2 uses graphite electrode；Reference electrode 4 uses saturated calomel electrode（SCE）.
Electrolyte solution 3 use mass fraction for 3.5% sodium chloride solution.20000mA/m is taken in process of the test2Pole
Galvanic current density, then must the output 50mA constant currents of power supply 6, have one in output constant current yet with big multi-vendor made power supply
Fixed error, so the fixed value resistance 7 of 100 Ω that connected in loop of polarizing, by testing the both end voltage of fixed value resistance 7 to carry out
The monitoring of electric current in loop, is conducive to carrying out electric current adjustment to power supply in time.In the presence of electric field, the Cl in solution-Xiang Jiang
Cast concrete base 8 can be passed through, is enriched in anode material 9, generate chlorine.And the region of auxiliary electrode 2, it is anti-to there is oxygen uptake in solution
Should, generate OH-.In order to ensure continual Cl-Corrosion function to anode material 9, electrolyte solution 3 is changed every 24h.
2nd, the method for anode material life prediction
In Accelerated polarization process of the test, influence more tight because the resistance of concrete elapses the ion that weathers over time
Weight, polarization potential is changed greatly, therefore should be using the frequency acquisition compared with small test data, it is ensured that carry out once pole in every 5 hours
Change the test of current potential.The voltage at polarization potential and fixed value resistance two ends can be tested by digital display universal meter, and pole is carried out every time
Before changing potential test, fixed value resistance both end voltage is tested first, if voltage is 5V, can directly gather polarization potential.Otherwise should
Regulation power supply, reaches 5V, after the collection for carrying out polarization potential after its stabilization again.Become when lasting rising occurs in polarization potential
During gesture, show now anode material destroyed, stop the collection of test data.When the polarization potential of anode material occurs what is risen
During trend, show the resistivity increase of anode material, conductive capability reduction.And anode material is normal before there is ascendant trend
Working condition.This state anode material will be greatly reduced and deliver electric field to reinforced concrete structure in practical engineering application
Efficiency, it is believed that anode material when there is ascendant trend has lost anode function.
Assuming that being T in 50mA galvanostatic polarizations effect anode material normal working hours（Unit：Hour）.According to NACE
Described in SP0290-2007, it is known that impressed current cathodic corrosion anode material in Practical Project maximum current density no more than
It is 108mA/m2, according to the current load for flowing through anode material, if anode material impressed current in reinforced concrete structure is cloudy
Years Of Service in the corrosion control system of pole is at least N, then N=125T/5913.For example, certain anode material is in above-mentioned acceleration
Normal working hours in polarimetric test device is 500 hours, then Years Of Service of the material in Practical Project is at least ten
Year half（Years Of Service is equal to and flows through anodic current density 20000mA/m2Normal working hours is multiplied by divided by 108, then it is small divided by 24
When, then divided by 365 days）.
Claims (10)
1. anode material acceleration test apparatus are used in a kind of steel and concrete structure cathodic corrosion control, it is characterised in that the accelerated test dress
Put and be made up of test reactor, working electrode, auxiliary electrode, reference electrode, fixed value resistance, electrolyte solution and universal meter, try
The a certain center side for testing reactor opens square hole, and working electrode is placed in hole, and surrounding is sealed with glass cement；Working electrode by
Cast concrete base, anode material, graphite column and wire are constituted, and cast concrete base is placed in hole and to be immersed in electrolyte molten for its underpart
In liquid, anode material is laid on cast concrete base upper surface, and one end center of graphite column is drilled with circular hole, and wire is placed in circular hole simultaneously
Sealed with epoxy type conductive silver glue, the other end of graphite column inserts the geometric center of anode material, the anode material is
The cement base anode material of steel and concrete structure impressed current cathodic corrosion control；Fixed value resistance, working electrode, electrolyte solution and auxiliary
Electrode is helped to constitute polarization loop, reference electrode, universal meter and working electrode constitute measuring loop.
2. anode material acceleration test apparatus are used in steel and concrete structure cathodic corrosion control according to claim 1, and its feature exists
It is plexiglass box in the test reactor, its internal diameter size is 100 × 100 × 100mm；The physical dimension of square hole
It is 50 × 50mm.
3. anode material acceleration test apparatus are used in steel and concrete structure cathodic corrosion control according to claim 1, and its feature exists
In a diameter of 5mm of the graphite column, a height of 8mm, Circularhole diameter is 2mm, depth 4mm.
4. anode material acceleration test apparatus are used in steel and concrete structure cathodic corrosion control according to claim 1, and its feature exists
It is 50 × 50 × 20mm in the cast concrete base physical dimension, anode material laying depth is 5mm.
5. anode material acceleration test apparatus are used in steel and concrete structure cathodic corrosion control according to claim 1, and its feature exists
Graphite electrode is used in the auxiliary electrode；Reference electrode uses saturated calomel electrode.
6. anode material acceleration test apparatus are used in steel and concrete structure cathodic corrosion control according to claim 1, and its feature exists
In the electrolyte solution use mass fraction for 3.5% sodium chloride solution.
7. anode material acceleration test apparatus are used in steel and concrete structure cathodic corrosion control according to claim 1, and its feature exists
In the fixed value resistance resistance be 100 Ω.
8. the steel and concrete structure cathodic corrosion control described in a kind of utilization claim 1-7 any claims is accelerated with anode material
Experimental rig carries out steel and concrete structure cathodic corrosion control anode material life-span prediction method, it is characterised in that methods described step
It is as follows：
First, to electrolyte solution is added in test reactor, cast concrete base is at least soaked 7 days in electrolyte solution；
2nd, constant current Accelerated polarization experiment is carried out using three-electrode system, controls constant current for 50mA, polarized current density is
20000mA/m2, when lasting ascent stage occurs in polarization potential, show now anode material destroyed, stop test data
Collection, the polarization time before record appearance ascendant trend of the anode material in Accelerated polarization experimental rig, this stage is passed through
When the polarization time gone through is the military service of anode material normal working time, i.e. anode material in this accelerated ageing environment
Between；
3rd, the anode material normal working hours for being recorded according to step 2 and the electric current lotus for acting on unit area anode material
Carry, calculate service life of the anode material in reinforced concrete structure cathodic corrosion control system.
9. anode material life-span prediction method is used in steel and concrete structure cathodic corrosion control according to claim 8, and its feature exists
In carrying out a test for polarization potential in every 5 hours.
10. anode material life-span prediction method is used in steel and concrete structure cathodic corrosion control according to claim 8, and its feature exists
Before polarization potential test is carried out every time, fixed value resistance both end voltage is tested first, if voltage is 5V, can directly gather polarization
Current potential, otherwise answers regulation power supply, reaches 5V, after the collection for carrying out polarization potential after its stabilization again.
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| TWI621842B (en) * | 2016-12-12 | 2018-04-21 | Chunghwa Telecom Co Ltd | Coating accelerated corrosion test method |
| CN110031390B (en) * | 2019-04-10 | 2024-04-02 | 中交四航工程研究院有限公司 | Device and method for in-situ evaluation of durability of in-service reinforced concrete structure |
| CN111693570B (en) * | 2020-06-17 | 2023-02-21 | 上海应用技术大学 | Device for measuring polarizability of reinforcing steel bar based on four-polarization method |
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| JPH09159601A (en) * | 1995-12-08 | 1997-06-20 | Babcock Hitachi Kk | Method and apparatus for predicting corrosion of metallic material |
| CN1718864A (en) * | 2005-07-08 | 2006-01-11 | 中国海洋大学 | Cathode protection method of regulatable sacrificial anode and its used device |
| US20090026093A1 (en) * | 2007-07-26 | 2009-01-29 | Ramotowski Thomas S | Cathodic delamination accelerated life test method |
| CN101244926A (en) * | 2008-03-28 | 2008-08-20 | 水利部交通部电力工业部南京水利科学研究院 | Steel reinforced concrete sacrificial anode cathodic protection devices in atmospheric environment and method thereof |
| CN101726455B (en) * | 2008-10-29 | 2012-04-25 | 宝山钢铁股份有限公司 | Method for rapidly evaluating corrosion susceptibility of trenches of welded pipes by adopting additional constant current |
| CN101762453B (en) * | 2010-01-15 | 2011-09-14 | 浙江大学 | Accelerated test method of inbuilt electrode simulating non-uniform corrosion of steel bar in concrete |
| CN102980845B (en) * | 2012-12-10 | 2015-04-29 | 奥瑞金包装股份有限公司 | Method for accelerating color printing iron corrosion by using electrochemical cathodic polarization |
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| CN103630484B (en) * | 2013-12-04 | 2016-01-13 | 哈尔滨工业大学 | The wireless self-energy accumulation corrosion monitoring node of weak isomery source energy supply |
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