CN112285006A - Electrochemical testing device for accelerated corrosion of reinforced concrete - Google Patents
Electrochemical testing device for accelerated corrosion of reinforced concrete Download PDFInfo
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- CN112285006A CN112285006A CN202010907384.0A CN202010907384A CN112285006A CN 112285006 A CN112285006 A CN 112285006A CN 202010907384 A CN202010907384 A CN 202010907384A CN 112285006 A CN112285006 A CN 112285006A
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- test box
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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
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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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
Abstract
The invention relates to an electrochemical testing device for accelerated corrosion of reinforced concrete, which comprises a testing box; a concrete block; the steel bar is inserted into the concrete block; a reference electrode; an auxiliary electrode; the electrochemical workstation is provided with a working electrode joint, a reference electrode joint and an auxiliary electrode joint, wherein the working electrode joint is connected with a steel bar, the reference electrode joint is connected with a reference electrode, and the auxiliary electrode joint is connected with an auxiliary electrode; a brine tank; the spraying device is connected with the brine tank, and the spraying direction of the spraying device faces to the concrete blocks and the reinforcing steel bars; the seawater tank is used for providing seawater for the test box; the liquid adjusting device is used for adjusting the height of the liquid level of the seawater in the test box; the carbon dioxide gas source is used for delivering carbon dioxide to the test box; the first heating device is used for heating the test box; and the second heating device is used for heating the brine tank and the seawater tank. By simulating various real marine environments, the corrosion resistance of the steel bar can be measured in a short time, and the test data is comprehensive.
Description
Technical Field
The invention relates to the field of electrochemical test equipment, in particular to an electrochemical test device for accelerated corrosion of reinforced concrete.
Background
Because of its low cost and durability, reinforced concrete is widely used in infrastructure construction throughout the world.
The corrosion of steel reinforcement in concrete is a major cause affecting the service life of the infrastructure. When the reinforced concrete is exposed to severe climates such as high temperature, humidity or marine environment, the corrosion rate of the reinforced concrete is greatly increased. The marine environment mainly comprises a plurality of corrosion zones such as a spray splashing zone, a seawater tidal range zone, a seawater full immersion zone and the like. The reinforced concrete in the spray splashing area is in a dry-wet alternating state, and the facilities in the area are most seriously corroded due to the synergistic effects of sufficient oxygen, sun and rain, sea wind and the like. Along with the continuous permeation of harmful substances such as chloride ions, carbon dioxide and the like in the external environment and the action of external load, cracks can be rapidly formed on the surface of a concrete structure, so that a protective layer on the surface of a steel bar is damaged, and the corrosion of the steel bar is excited. The erosion of chloride ions and concrete carbonization are main factors for destroying the passive film on the surface of the reinforcing steel bar. Corrosion products and expansion generated by the corrosion of the steel bars can cause the concrete protective layer to crack and peel off, and the original bearing function of the reinforced concrete structure can be lost in severe cases.
The simulated marine environment of the test device for researching the accelerated corrosion of the reinforced concrete in the existing laboratory is too single, so that the test data is incomplete.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the electrochemical testing device for the accelerated corrosion of the reinforced concrete can provide a relatively comprehensive marine environment for the accelerated corrosion of the reinforced concrete, has relatively comprehensive testing data, and has important practical significance for researching the corrosion resistance of the reinforced concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electrochemical test device for accelerated corrosion of reinforced concrete comprises
A test box;
the concrete block is arranged at the bottom of the test box;
the steel bar is inserted into the concrete block;
the reference electrode is arranged in the test box and is arranged on one side of the steel bar;
the auxiliary electrode is arranged in the test box and arranged on one side of the steel bar;
the electrochemical workstation is provided with a working electrode joint, a reference electrode joint and an auxiliary electrode joint, wherein the working electrode joint is connected with a steel bar, the reference electrode joint is connected with a reference electrode, and the auxiliary electrode joint is connected with an auxiliary electrode;
the brine tank is used for containing brine and arranged on one side of the test box;
the spraying device is connected with the brine tank, and the spraying direction of the spraying device faces to the concrete blocks and the reinforcing steel bars;
the seawater tank is used for containing seawater, arranged on one side of the test box and used for providing seawater for the test box;
the liquid adjusting device is characterized in that a water injection pipe is connected with a seawater tank and a test box, and a drain pipe is arranged on one side of the test box and used for adjusting the height of the seawater level in the test box;
the carbon dioxide gas source is arranged on one side of the test box, is connected with the test box and is used for conveying carbon dioxide to the test box;
the first heating device is arranged corresponding to the test box and used for heating the test box;
and the second heating device is respectively arranged corresponding to the brine tank and the seawater tank and used for heating the brine tank and the seawater tank.
Further, the upper end of the test box is provided with a cover plate, the cover plate is provided with an air inlet and an air outlet, the carbon dioxide source is connected with an air inlet pipe, and the air inlet pipe penetrates through the air inlet and is connected with the test box.
Further, spray set includes porous nozzle and first water pump, and first water pump both ends are connected respectively in brine tank and porous nozzle, and in the test box was located to porous nozzle, porous nozzle set up towards concrete piece and reinforcing bar.
Furthermore, a first valve is arranged on a pipeline connecting the porous nozzle and the first water pump.
Further, transfer liquid device and include the second water pump, and the second water pump both ends are connected respectively in test box and sea water tank, and the test box lower extreme is equipped with the liquid outlet.
Furthermore, a second valve is arranged on a pipeline connecting the test box and the second water pump.
Further, the liquid outlet is connected with a drain pipe, and the drain pipe is provided with a third valve.
Further, first heating device is first heating pad, and test box lower extreme is located to first heating pad.
Further, the second heating device is a second heating pad, and the second heating pad is arranged at the lower ends of the brine tank and the seawater tank.
Furthermore, the brine tank and the sea water tank are combined into an integrally formed liquid storage tank.
In summary, the present invention has the following advantages:
through simulating multiple real marine environment to carbon dioxide inputs the corruption of reinforcing bar in the test box and accelerates, thereby can survey the corrosion resisting property of reinforcing bar through the electrochemistry workstation in the short time, test data is more comprehensive, at the in-process of accelerated corrosion test, can judge the corruption condition of sample in step, has important realistic meaning to studying reinforced concrete's corrosion resistance.
Drawings
Fig. 1 is a schematic plan view of an embodiment of the present invention.
Description of reference numerals:
1-test box, 2-cover plate, 3-air outlet pipe, 4-reference electrode, 5-steel bar, 6-concrete block, 7-auxiliary electrode, 8-air inlet pipe, 9-porous nozzle, 10-first water pump, 11-water pipe, 12-liquid inlet, 13-second water pump, 14-water injection pipe, 15-liquid outlet, 16-third valve, 17-water outlet pipe, 18-liquid storage tank, 181-brine tank, 182-seawater tank, 19-first heating pad, 20-second heating pad, 21-air inlet hole, 22-air outlet hole, 23-first valve, 24-second valve, 25-electrochemical workstation, A-reference electrode joint, B-auxiliary electrode joint, C-working electrode joint.
Detailed Description
The present invention will be described in further detail below.
As shown in FIG. 1, an electrochemical test device for accelerated corrosion of reinforced concrete comprises
A test box 1;
the concrete block 6 is arranged at the bottom of the test box 1;
the steel bar 5 is inserted into the concrete block 6;
the reference electrode 4 is arranged in the test box 1 and is arranged on one side of the steel bar 5;
the auxiliary electrode 7 is arranged in the test box 1 and is arranged on one side of the steel bar 5;
the electrochemical workstation 25 is provided with a working electrode joint C, a reference electrode joint A and an auxiliary electrode joint B, wherein the working electrode joint C is connected with the reinforcing steel bar 5, the reference electrode joint A is connected with the reference electrode 4, and the auxiliary electrode joint B is connected with the auxiliary electrode 7;
a brine tank 181 for holding brine and provided at one side of the test chamber 1;
the spraying device is arranged in the test box 1 and is connected with the brine tank 181, and the spraying direction of the spraying device faces to the concrete block 6 and the reinforcing steel bar 5;
a seawater tank 182 for holding seawater, disposed at one side of the test box 1, for supplying seawater to the test box 1;
the liquid adjusting device is characterized in that a water injection pipe 14 is connected with the seawater tank 182 and the test box 1, and a drain pipe 17 is arranged on the left side of the test box 1 and used for adjusting the height of the seawater liquid level in the test box 1;
the carbon dioxide gas source is arranged on one side of the test box 1, is connected with the test box 1 and is used for conveying carbon dioxide to the test box 1;
the first heating device is arranged corresponding to the test box 1 and used for heating the test box 1;
and second heating means provided corresponding to the brine tank 181 and the sea water tank 182, respectively, for heating the brine tank 181 and the sea water tank 182.
The first heating device heats the test box 1, and the temperature in the test box 1 can be adjusted. The second heating means heats the brine tank 181 and the sea water tank 182, and can adjust the temperature of the brine and the sea water in the brine tank 181 and the sea water tank 182. The stability of the test temperature in the experimental process can be ensured, and the corrosion resistance of the reinforced concrete at different temperatures can be obtained.
Through the spraying of spray set in test box 1, can simulate the corruption condition that reinforced concrete is in salt fog environment and the area environment that splashes.
The liquid level heights of the seawater in the test box 1 are adjusted through the liquid adjusting device, and the reinforced concrete can be simulated to be located in a seawater tidal range area and a seawater full-immersion area respectively.
The liquid adjusting device is used for continuously feeding and discharging liquid to increase the mobility of the seawater in the test box 1, simulate the flow of the seawater in a real environment, ensure the stability of the content of chloride ions and increase the accuracy and the rigor of the test.
By feeding carbon dioxide gas into the test chamber 1, the carbonization process of the reinforced concrete can be accelerated.
Because the main factors influencing the corrosion of the reinforced concrete are the corrosion of chloride ions and the carbonization of carbon dioxide, the embodiment of the invention accelerates the corrosion of the steel bar 5 by simulating various real marine environments and inputting the carbon dioxide into the test box 1, so that the corrosion resistance of the steel bar 5 can be measured by the electrochemical workstation 25 in a short time, the test data is comprehensive, the corrosion condition of a sample can be synchronously judged in the process of an accelerated corrosion test, and the method has important practical significance for researching the corrosion resistance of the reinforced concrete.
In this embodiment, the brine tank 181 contains a sodium chloride solution having a concentration of 5%. The sea chest 182 contains natural sea water. The auxiliary electrode 7 is made of platinum, and the reference electrode 4 is a saturated calomel electrode.
The upper end of the test box 1 is provided with a cover plate 2, the cover plate 2 is provided with an air inlet 21 and an air outlet 22, a carbon dioxide source is connected with an air inlet pipe 8, and the air inlet pipe 8 penetrates through the air inlet 21 and is connected with the test box 1.
Specifically, the test box 1, the cover plate 2, the seawater box 182 and the brine box 181 are made of PE. The reinforcing steel bar 5, the reference electrode 4 and the auxiliary electrode 7 are respectively connected to a working electrode connector C, a reference electrode connector A and an auxiliary electrode connector B of the electrochemical workstation 25 through a copper wire penetrating through the cover plate 2. An air inlet pipe 8 made of plastic materials is inserted into the air inlet 21, the air inlet pipe 8 is long, and the bottom of the air inlet pipe 8 extends into the bottom end of the test box 1 and is used for conveying carbon dioxide. The air outlet pipe 3 made of plastic materials is inserted into the air outlet hole 22, and the air outlet pipe 3 is short and arranged at the top of the test box 1 and used for discharging redundant carbon dioxide and stretching into a detection instrument to determine the concentration of the carbon dioxide in the test box 1. The accelerated corrosion speed of the reinforced concrete can be effectively controlled by controlling the concentration of the carbon dioxide.
The spraying device comprises a porous nozzle 9 and a first water pump 10, two ends of the first water pump 10 are respectively connected to the brine tank 181 and the porous nozzle 9, the porous nozzle 9 is arranged in the test box 1, and the porous nozzle 9 is arranged towards the concrete block 6 and the steel bar 5.
Specifically, the brine tank 181 is connected from the brine tank 181 to the porous nozzle 9 through a water pipe 11. The first water pump 10 is arranged in the middle of the water pipe 11. Through the pressurization of first water pump 10, make the salt solution in the salt water tank 181 form the salt fog behind porous nozzle 9, spray on concrete piece 6 and reinforcing bar 5, effectively simulate the corruption condition that reinforced concrete is in the salt fog environment and the splash zone environment.
A first valve 23 is arranged on a pipeline connecting the porous nozzle 9 and the first water pump 10.
By opening or closing the first valve 23, the spraying time and the spraying amount of the porous nozzle 9 can be conveniently controlled, and the accelerated corrosion speed of the reinforced concrete can be accurately controlled.
The liquid adjusting device comprises a second water pump 13, two ends of the second water pump 13 are respectively connected to the test box 1 and the sea water tank 182, and a liquid outlet 15 is formed in the lower end of the test box 1.
A liquid inlet 12 is formed in the right side of the test box 1, the second water pump 13 can convey seawater in the seawater tank 182 into the test box 1 through the liquid inlet 12, and the liquid outlet 15 of the test box 1 can discharge the seawater in the test box 1.
Through the cooperation of second water pump 13 and liquid outlet 15, constantly toward test box 1 notes liquid and flowing back, can adjust the sea water level in test box 1, increase the mobility of sea water, simulated the mobile sea water under the real environment, the content of the chloride ion in effective control test box 1 can simulate reinforced concrete respectively and be located sea water tidal range district and sea water full immersion area, increase accuracy and the rigor nature of test.
And a second valve 24 is arranged on a pipeline connecting the test box 1 and the second water pump 13.
The liquid outlet 15 is connected with a drain pipe 17, and the drain pipe 17 is provided with a third valve 16.
Specifically, the sea water tank 182 is connected to the test tank 1 through the water injection pipe 14. The second water pump 13 and the second valve 24 are arranged in the middle of the water injection pipe 14. The level of seawater in the test chamber 1 can be controlled more easily by the arrangement of the second valve 24 and the third valve 16.
The first heating device is a first heating pad 19, and the first heating pad 19 is arranged at the lower end of the test box 1.
The second heating means is a second heating mat 20, and the second heating mat 20 is provided at the lower ends of the brine tank 181 and the sea water tank 182.
The temperature of the test box 1, the seawater box 182 and the brine box 181 is controlled by the first heating mat 19 and the second heating mat 20, so that the stability of the test temperature in the experimental process can be ensured, and the corrosion resistance of the reinforced concrete at different temperatures can be obtained.
The brine tank 181 and the sea water tank 182 are combined into the integrally formed liquid storage tank 18.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. An electrochemical testing device for accelerated corrosion of reinforced concrete is characterized in that: comprises that
A test box;
the concrete block is arranged at the bottom of the test box;
the steel bar is inserted into the concrete block;
the reference electrode is arranged in the test box and is arranged on one side of the steel bar;
the auxiliary electrode is arranged in the test box and arranged on one side of the steel bar;
the electrochemical workstation is provided with a working electrode joint, a reference electrode joint and an auxiliary electrode joint, wherein the working electrode joint is connected with a steel bar, the reference electrode joint is connected with a reference electrode, and the auxiliary electrode joint is connected with an auxiliary electrode;
the brine tank is used for containing brine and arranged on one side of the test box;
the spraying device is connected with the brine tank, and the spraying direction of the spraying device faces to the concrete blocks and the reinforcing steel bars;
the seawater tank is used for containing seawater, arranged on one side of the test box and used for providing seawater for the test box;
the liquid adjusting device is connected with the seawater tank and the test box and is used for adjusting the height of the seawater level in the test box;
the carbon dioxide gas source is arranged on one side of the test box, is connected with the test box and is used for conveying carbon dioxide to the test box;
the first heating device is arranged corresponding to the test box and used for heating the test box;
and the second heating device is respectively arranged corresponding to the brine tank and the seawater tank and used for heating the brine tank and the seawater tank.
2. An electrochemical test device for accelerated corrosion of reinforced concrete according to claim 1, wherein: the test box upper end is equipped with the apron, and the apron is equipped with inlet port and venthole, and the carbon dioxide air supply is connected with the intake pipe, and the intake pipe passes the inlet port and connects the test box.
3. An electrochemical test device for accelerated corrosion of reinforced concrete according to claim 1, wherein: spray set includes porous nozzle and first water pump, and first water pump both ends are connected respectively in brine tank and porous nozzle, and in the test box was located to porous nozzle, porous nozzle set up towards concrete piece and reinforcing bar.
4. An electrochemical test device for accelerated corrosion of reinforced concrete according to claim 3, wherein: and a first valve is arranged on a pipeline connecting the porous nozzle and the first water pump.
5. An electrochemical test device for accelerated corrosion of reinforced concrete according to claim 1, wherein: transfer liquid device and include the second water pump, the second water pump both ends are connected respectively in test box and sea water tank, and the test box lower extreme is equipped with the liquid outlet.
6. An electrochemical test device for accelerated corrosion of reinforced concrete according to claim 5, wherein: and a second valve is arranged on a pipeline connecting the test box and the second water pump.
7. An electrochemical test device for accelerated corrosion of reinforced concrete according to claim 5, wherein: the liquid outlet is connected with a drain pipe, and the drain pipe is provided with a third valve.
8. An electrochemical test device for accelerated corrosion of reinforced concrete according to claim 1, wherein: the first heating device is a first heating pad, and the first heating pad is arranged at the lower end of the test box.
9. An electrochemical test device for accelerated corrosion of reinforced concrete according to claim 1, wherein: the second heating device is a second heating pad which is arranged at the lower ends of the brine tank and the seawater tank.
10. An electrochemical test device for accelerated corrosion of reinforced concrete according to claim 1, wherein: the brine tank and the seawater tank are combined into an integrally formed liquid storage tank.
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| CN202010907384.0A CN112285006A (en) | 2020-09-02 | 2020-09-02 | Electrochemical testing device for accelerated corrosion of reinforced concrete |
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| CN202010907384.0A CN112285006A (en) | 2020-09-02 | 2020-09-02 | Electrochemical testing device for accelerated corrosion of reinforced concrete |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218728A (en) * | 2021-05-19 | 2021-08-06 | 上海海事大学 | Preparation method of test piece for testing electrochemical performance of steel bar in CFRP (carbon fiber reinforced plastics) repaired cracked concrete |
| CN114112890A (en) * | 2021-11-12 | 2022-03-01 | 交通运输部天津水运工程科学研究所 | Device and method for measuring critical chloride ion concentration of reinforced concrete in tidal zone and splash zone |
| WO2024014003A1 (en) * | 2022-07-15 | 2024-01-18 | 日本電信電話株式会社 | Corrosion reproduction device, control device, evaluation system, control method, and program |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113218728A (en) * | 2021-05-19 | 2021-08-06 | 上海海事大学 | Preparation method of test piece for testing electrochemical performance of steel bar in CFRP (carbon fiber reinforced plastics) repaired cracked concrete |
| CN114112890A (en) * | 2021-11-12 | 2022-03-01 | 交通运输部天津水运工程科学研究所 | Device and method for measuring critical chloride ion concentration of reinforced concrete in tidal zone and splash zone |
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Application publication date: 20210129 |