CN101226164B - Embedment type reference electrode for inspecting/detecting steel reinforced concrete erosion - Google Patents
Embedment type reference electrode for inspecting/detecting steel reinforced concrete erosion Download PDFInfo
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- CN101226164B CN101226164B CN2008100138707A CN200810013870A CN101226164B CN 101226164 B CN101226164 B CN 101226164B CN 2008100138707 A CN2008100138707 A CN 2008100138707A CN 200810013870 A CN200810013870 A CN 200810013870A CN 101226164 B CN101226164 B CN 101226164B
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Abstract
The invention relates to an embedment reference electrode for monitoring/detecting steel concrete, belonging to the technical field of steel concrete structure corrosion and protection. The invention comprises a gland, a cable, an electrode sealing drum, a porous ceramic shell, an electrode and an alkali electrolyte paste. The electrode body is from Mo/MoO3 electrode, the internal reference electrolyte paste is slurry alkali electrolyte solution and added with some absorbent polymers, the shell is one anti-compression porous ceramic shell, the top of the T-type electrode is electrically connected with the cable, the cable through the gland at the top of the electrode can be abutted with external device, the lower small section of the electrode sealing drum is sheathed with the porous ceramic shell which bottom is sealed and filled with alkali electrolyte paste, and the whole electrode is fixed integrally. The inventive product is suitable to be embedded in concrete alkali medium, with better potential stability, strong alkali polarization resistance, small volume, compact electrode structure, easy embedment, fixation and sealing.
Description
Technical field:
The present invention relates to reinforced concrete structures corrosion and guard technology field, particularly a kind of steel reinforced concrete erosion prison/detection embedment type reference electrode for inspecting.
Background technology:
The one of the main reasons of reinforced concrete structure failure is the corrosion of its inner stiffener.Under normal conditions, concrete is a kind of high alkalinity environment (the pH value is about about 13), and reinforcing bar forms passivating film at this environment lower surface, and corrosion rate is very low.But under environment such as marine site, work as reinforced concrete regolith Cl
-During pollution, remove cryosel winter as marine environment or bridge structure after, Cl
-Hole by concrete surface diffuses to rebar surface gradually, destroys the rebar surface passivity, makes reinforcing bar transfer activated state to by passive state, corrodes.Cathodic protection is considered to prevent the effective ways of ocean reinforced concrete constructional work reinforcement corrosion.Cathodic protection can be played the effect of two aspects: the one, and provide protective current to suppress the galvanic corrosion of reinforcing bar to reinforcing bar; The 2nd, suppress the diffusive migration of Cl-ion to rebar surface.Contrast electrode is the part of cathodic protection system, plays vital role such as estimating protection effect, detection and monitoring reinforcement corrosion state, and for cathodic protection system provides feedback signal, the long-term stability of its current potential can directly affect the reliability of system.Be in the reinforcing bar of different electrochemical states, its corrosion potential is different, therefore can judge the etch state of reinforcing bar by the method for corrosion potential monitoring/detection.But,, bring a series of difficulties for the enforcement of cathodic protection and the measurement and the monitoring of reinforcing bar current potential because rebar surface is covered with the bigger thick concrete layer of resistivity in the xoncrete structure.Be generally used for the multiple contrast electrode that the steel construction current potential detects, owing to be difficult near reinforcing bar, therefore the existence that has big IR to fall in the testing process, and because concrete medium is a kind of alkaline system, causing does not have the contrast electrode that is applicable to this class formation maturation so far as yet.
Because concrete belongs to porous structure, has certain perviousness, general liquid phase contrast electrode is difficult to long-term work, so embedment type reference electrode for inspecting just becomes the object of research and development.Simultaneously, the potential measurement of xoncrete structure, the contrast electrode that requires to embed is firm and " forever ".In order to obtain stable electrode potential, must under the low moisture environmental baseline of xoncrete structure, keep the moisture of electrode interface and the hydroscopicity of increase electrode body.
Summary of the invention:
The objective of the invention is to overcome the shortcoming that exists in the prior art, seek a kind of embedment type reference electrode for inspecting of design preparation and structure thereof, be i.e. the suit contrast electrode body material of in concrete alkalescence media environment, working of preparation; The moisture of taking to be fit to remains in the material, to keep the moisture of electrode interior, strengthens hydroscopicity; Pass through Mo/MoO
3Electrode body material places the form that includes alkaline paste electrolyte and porous ceramics shell, is embedded in the reinforced concrete structure reinforcing bar current potential is detected.
In order to realize the foregoing invention purpose, agent structure of the present invention comprises gland, cable, electrode sealing bore, porous ceramics shell, electrode body and alkaline electrolyte paste; The bulk material of electrode is the Mo/MoO3 electrode; Interior reference electrolyte is stuck with paste and is the alkaline electrolyte liquid of pasty state, and adds an amount of absorbent polymer material; External shell is a crushing resistance porous ceramics shell; T type electrode body top electric connection is connected to cable, the gland that the cable string is crossed electrode tip can dock with outer, and electrode sealing bore bottom thin segment outside cover is shaped on how empty ceramic package, ceramic package base seal, the alkaline electrolyte paste is filled up in space in it, and electrode integral body is made integral structure admittedly.The bulk material of contrast electrode is according to electrochemical principle, selects for use high-purity molybdenum rod directly to be processed into electrode body, after surface treatment, is prepared from the high-temperature oxydation medium.Require the salt or the solubleness of oxide in solution of electrode metal very little, could keep the long-time stability of electrode potential like this, and reduce the tested systems contamination of heavy; The alkaline electrolyte of pasty state and add an amount of absorbent polymer material can keep over a long time stability, electrode material can reach quite low consumption coefficient, guarantees that electrode is in the works fine state;
Sturdy and durable and electrode system and external agency is electrically connected for the contrast electrode that guarantees to imbed, adopt resistance to compression porous ceramics shell, keep combining closely as micropore permeation film and concrete, make the dry possibility of electrode reduce to minimum, and can from environment, absorb water by the inner water-absorbing material of ceramic package and to keep electrolytical stable.
The present invention compared with prior art has following advantage: solved the technical barrier in the prison/detection of steel reinforced concrete erosion current potential, adopted Mo/MoO
3Electrode detects the contrast electrode of usefulness as protecting reinforced concrete cathode and corrosion, is adapted at embedding application in the concrete alkalescence medium, has the advantages that good, the anti-polarization performance of potential stability is strong, volume is little, electrode structure is compact, and is easy to bury underground and consolidates envelope.Particularly molybdenum/molybdena electrode is adapted at using in the alkaline solution, and chloride ion content is little to the influence of its potential stability, and potential stability is better in the saturated calcium hydroxide medium of the chlorion of 0.25～1.0% different content; Potential drifting is no more than 20mV; Potential fluctuation is not more than 30mV under the long-term polarization of 5uA electric current.
Description of drawings:
Fig. 1 is the contrast electrode structural principle synoptic diagram that the present invention relates to.
Fig. 2 is the reinforcing bar current potential one time curve figure of concrete component in the embodiment of the invention.
Embodiment:
Further describe below in conjunction with drawings and Examples.
The agent structure of present embodiment comprises gland 1, cable 2, electrode sealing bore 3, porous ceramics shell 4, Mo/MoO
3Electrode body 5 and alkaline electrolyte stick with paste 6; The contrast electrode body material of working in the concrete medium environment by suiting, interal reference electrolyte and external shell three parts constitute; Mo/MoO
3Electrode body 5 adopts high-purity molybdenum rod directly to be processed into, and through surface finish, after wiping etc. were handled, high-temperature oxydation was prepared from the oxide isolation of 300 ℃～650 ℃ of fusions; Electrolyte solution with 5%～10% (containing alkaline medium etc.) adopts methylcellulose to come gelatinization, and electrolyte is soaked in the fibrous matrix; For keeping the stability of current potential, must add water-absorbing material (macromolecular material etc.); In the electrolyte of this maintenance stability over a long time, electrode material can reach quite low consumption coefficient; Adopt resistance to compression porous ceramics shell 4 to keep combining closely, make the dry possibility of electrode reduce to minimum as micropore permeation film and concrete.Wherein the key technical indexes of porous ceramics shell is:
Compressive strength 〉=30Mpa
Thickness 3～7mm
Aperture 0.5 μ～3.5 μ
Porosity 25%～40%
Embodiment 1:
With reference to ASTM C876-91, NACE RP0290-90, RP0390-90, GB7387-87 standard, adopt the Mo/MoO of simulation concrete solution to the invention process preparation
3Electrode has carried out current potential homogeneity, the long-time stability of electrode potential, the test of anti-polarization performance.
The match ratio of table 1. simulation concrete solution
| Numbering | Match ratio |
| 1 | Saturated Ca (OH) 2Solution |
| 2 | Saturated Ca (OH) 2Solution+1.0%NaCl |
| 3 | Saturated Ca (OH) 2Solution+0.5%NaCl |
| 4 | Saturated Ca (OH) 2Solution+0.25%NaCl |
In the saturated Ca of different chlorine ion concentrations (OH) 2 solution (2.2M, PH=12.5), measured Mo/MoO3 electrode potential mean value sees Table 2.Test condition soaked 4 months in corresponding solution at ambient temperature, and electrode potential is with respect to saturated calomel electrode (SCE).
The potential value of table 2Mo/MoO3 electrode in simulation concrete solution
| Chloride content (%) | Average potential (mV.SCE) | The normal potential deviation, mV |
| 0 | -404 | 9.6 |
| 0.25 | -422 | 4.5 |
| 0.5 | -425 | 10.9 |
| 1.0 | -426 | 10.5 |
Embodiment 2:
Select the Mo/MoO of the free way scramble current monitoring system in the environment of beach for use
3Contrast electrode.City underground and light rail systems are to be the transportation system of power with the direct supply, primary structure is a reinforced concrete, in the actual moving process of light rail systems, need carry out the monitoring and the control of stray current corrosion, in order to judge the control effect of stray current, all need reinforced concrete structure is carried out potential monitoring.In the potential measurement of concrete bridge deck, the contrast electrode that require to embed is firm in nonvolatil.Mo/MoO
3Electrode embedding contrast electrode result in two years on bridge floor shows that the current potential of kind electrode in concrete is more stable, and potential difference is very little between electrode.Mo/MoO
3The electrogram of electrode in alkaline environment or in the concrete medium shows it is gratifying.
Claims (4)
1. steel reinforced concrete erosion prison/detection embedment type reference electrode for inspecting, agent structure comprise that gland, cable, electrode sealing bore, porous ceramics shell, electrode body and alkaline electrolyte stick with paste; The bulk material that it is characterized in that electrode is the Mo/MoO3 electrode; Interior reference electrolyte is stuck with paste and is the alkaline electrolyte liquid of pasty state, and adds an amount of absorbent polymer material; External shell is a crushing resistance porous ceramics shell; T type electrode body top electric connection is connected to cable, the gland that the cable string is crossed electrode tip with dock outward, electrode sealing bore bottom thin segment outside cover is shaped on how empty ceramic package, ceramic package base seal, the alkaline electrolyte paste is filled up in space in it, and electrode integral body is made integral structure admittedly; Reference electrolyte paste is the electrolyte solution that 5%-10% is contained alkaline medium in described, adopts methylcellulose to come gelatinization, and electrolyte osmosis forms in fibrous matrix.
2. steel reinforced concrete erosion prison/detection embedment type reference electrode for inspecting according to claim 1, the bulk material that it is characterized in that contrast electrode is according to electrochemical principle, select for use high-purity molybdenum rod directly to be processed into electrode body, after surface treatment, in the high-temperature oxydation medium, be prepared from.
3. steel reinforced concrete erosion prison/detection embedment type reference electrode for inspecting according to claim 2 is characterized in that its high-temperature oxydation carries out in temperature is 300 ℃～650 ℃ melt oxidation medium.
4. steel reinforced concrete erosion prison/detection embedment type reference electrode for inspecting according to claim 1 is characterized in that the key technical indexes of porous ceramics shell is: pressure resistance 〉=30Mpa; Thickness 3～7mm; Aperture 0.5 μ～3.5 μ; Porosity 25%～40%.
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| CN101865817B (en) * | 2010-06-08 | 2011-12-14 | 天津大学 | Sensor and detection method for detecting corrosion of buried metal |
| CN102401781A (en) * | 2011-09-28 | 2012-04-04 | 中交第四航务工程局有限公司 | Reference electrode for reinforced concrete and manufacturing method of reference electrode |
| CN102879323B (en) * | 2012-10-10 | 2014-11-19 | 中国矿业大学 | Experiment system for corrosion of stray currents in subway |
| CN103822950B (en) * | 2014-03-11 | 2016-04-06 | 苏州热工研究院有限公司 | Steel reinforced concrete erosion monitoring/detect and use compound embedment type reference electrode for inspecting |
| CN104964919B (en) * | 2015-05-22 | 2017-11-24 | 河海大学 | A kind of pH value gel electrolyte cushion applied to solid-state Ag/AgCl reference electrodes and preparation method thereof |
| CN106770472A (en) * | 2017-02-24 | 2017-05-31 | 广东省建筑材料研究院 | A kind of concrete parameter detecting probe |
| CN113063699A (en) * | 2020-01-02 | 2021-07-02 | 中国科学院海洋研究所 | Device and method for testing apparent hydrogen diffusion coefficient of pure titanium |
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Address after: 266071 Shandong Province, Qingdao city Jinhu Road No. 12 Co-patentee after: Qingdao Sunrui Marine Environment Engineering Co., Ltd. Patentee after: No.725 Inst. China Shipping Heavy Industry Group Corp. Address before: 266071 Shandong Province, Qingdao city Jinhu Road No. 12 Co-patentee before: Sunrui Marine Environment Engineering Company Patentee before: No.725 Inst. China Shipping Heavy Industry Group Corp. |