CN1438478A - Method for detecting corrosion of concrete bar in reinforced concrete - Google Patents
Method for detecting corrosion of concrete bar in reinforced concrete Download PDFInfo
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- CN1438478A CN1438478A CN 03115903 CN03115903A CN1438478A CN 1438478 A CN1438478 A CN 1438478A CN 03115903 CN03115903 CN 03115903 CN 03115903 A CN03115903 A CN 03115903A CN 1438478 A CN1438478 A CN 1438478A
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Abstract
The method directly measures the corrosion happened on reinforcing steel bars in real time. The sensor comprises several reinforcing steel bars with non equal lengths, the stainless steel bars having same quantities and lengths as of the reinforcing steel bars, the base seat and the conducting wires. The reinforcing steel bars and the stainless steel bars in stepped appearance are fixed in the fixed slot in the base seat of the sensor side by said. The conducting wires are leaded out and numbered from the threading hole in the middle of the fixed slot. In the time of construction, the said sensors are embedded into concretes. While in the period of the constructions being used, the data from the sensors are collected regularly.
Description
Affiliated field:
The present invention relates to the detection method of reinforcement corrosion in a kind of reinforced concrete member, can detect for a long time the reinforcement corrosion situation in the reinforced concrete member under the chloride environment and do not damage concrete surface, the permanance that is applied to reinforced concrete structure in the Structural Engineering field detects and assessment.
Technical background:
The steel bar in reinforced concrete corrosion is one of major influence factors that influences structure durability.Compare with the reinforcement corrosion that the concrete cover carbonization causes, the reinforcement corrosion speed that chlorion invasion causes faster (approximately be the reinforcement corrosion speed that causes of carbonization 10 times), the loss that causes are bigger, have caused the extensive concern of engineering circle and academia.
The chlorine ion concentration control of in the engineering concrete being stirred in thing or the adjuvant at present is generally tighter, and therefore, the chloride ion corrosion in the concrete is because chlorion from outside invading, and in the rebar surface accumulation, reaches and causes after certain concentration mostly.Can cause that the chlorion least concentration that reinforcing bar begins to corrode is called critical concentration.
Because the reinforcement corrosion speed that the chlorion invasion causes is fast, and corrosion generation in a single day, be difficult to adopt an effective measure and eradicated.Therefore, the countermeasure that should take in the actual engineering is: adopt the effective monitoring means of a cover, before reinforcement corrosion does not begin as yet, find early to cause the hidden danger of reinforcement corrosion, and take appropriate measures and take precautions against targetedly.With find reinforcement corrosion after the method handled again compare, this countermeasure will play a multiplier effect, and compare with the preservative treatment of reruning after reinforcing bar begins corrosion, economically consume for a short time, antiseptic effect is better.
For reaching above purpose, existing method is that the protective seam concrete at scene is taken a sample, and promptly drills through the concrete powder art in the concrete surface layer, then the chloride ion content in the chemical examination concrete powder sample in testing laboratory.This method is for the judgement of reinforcement corrosion state, and actual is a kind of indirect method of testing, and its defective is: 1) sampling depth of concrete powder is difficult to accurately determine; 2) concrete cover there is certain destruction; 3) for different concrete and surrounding environment (temperature, humidity, pH value etc.), the chlorion critical concentration itself that causes reinforcement corrosion exists than big-difference, the chlorion critical concentration changes with concrete condition, it or not constant, the result that test obtains according to current methods can not judge the etch state of reinforcing bar exactly.
Summary of the invention:
The objective of the invention is at the deficiency in the existing detection method, the detection method of reinforcement corrosion in a kind of reinforced concrete member is provided, under the prerequisite of not damaging concrete surface, can accurately, nondestructively detect under the concrete working environment dangerous sharp side apart from the distance of reinforcing bar.
For realizing such purpose, in the technical scheme of the present invention, adopt carrier---the method that reinforcing bar is measured in real time that directly corrosion is taken place.Detect sensor-based system and comprise sensor and current potential current measuring instrument, sensor is made up of stainless steel bar, pedestal and the lead of the some bar reinforcements that are uneven in length, equal number and length.Bar reinforcement and stainless steel bar become stepped appearance to be fixed on side by side in the pickup groove of sensor base, lead is drawn and is numbered from the through wires hole at pickup groove center, during construction detecting sensor is imbedded concrete, in the operating period of structure, regularly sensor is carried out data acquisition, can be under the prerequisite of not damaging concrete surface, by detection, determine to cause the chlorion critical concentration sharp side degree of depth of reinforcement corrosion to the reinforcing bar of imbedding the inside concrete different depth.
Method of the present invention specifically comprises following content:
1, the making of sensor:
Sensor is by the some bar reinforcements that are uneven in length, form with stainless steel bar, pedestal and the lead of bar reinforcement equal number and length.With the end face of wire bonds to every bar reinforcement and stainless steel bar, another end face is a workplace.All surface except that workplace is carried out encapsulation process.
Pedestal is made by engineering plastics, has the pickup groove of two parallelism bar reinforcements or stainless steel bar slightly larger in diameter on the pedestal, and its effect is fixedly bar reinforcement and stainless steel bar in a certain order.The pickup groove center has through wires hole.
According to the order from growing to lacking, bar reinforcement and stainless steel bar are inserted in the pickup groove of pedestal side by side, form stepped.An end that inserts pickup groove is a wire connecting ends, and lead is derived from the through wires hole at pickup groove center.After lead was numbered, steel reinforcement corrosion sensor was made and is finished.
Sensor is the on-site sampling reinforcing bar preferably, completes at the scene.Also can adopt with the used reinforcing bar of the same type of construction, complete outside the venue.
2, sensor is in place:
Before the deposit concrete, sensor is fixed on the member reinforcing bar.Note fixedly can not contacting between the iron wire and bar reinforcement, stainless steel bar, can not contact between bar reinforcement, stainless steel bar and the member reinforcing bar.In fixing process, should guarantee that the exposed surface of bar reinforcement and stainless steel bar is parallel with concrete surface, and guarantee that the longest bar reinforcement or stainless steel bar workplace is not more than 5mm apart from concrete surface.
Deposit concrete after the maintenance form removal, should be put lead in order, and with polybag lead be wrapped.
3, test:
In the operating period of member,, and perform record regularly with electric current, bar reinforcement and potential difference (PD) between the stainless steel bar and electric current that the potentiometer measurement is arranged side by side.
When the do not suffer erosion influence of medium of reinforcing bar, when corrosion did not take place as yet, electric current and potential difference (PD) were all smaller; In case when potential difference (PD) or electric current take place to increase suddenly, illustrate that the rebar surface of uprushing has been subjected to the influence of corrosive medium, corrosion takes place.As time goes on, the invasion sharp side of corrosive medium can deepen continuously, and the bar reinforcement quantity that is subjected to corroding influence increases gradually.Beginning is that rod iron the longest, that the end face distance concrete surface is nearest is affected, and short subsequently rod iron begins to be affected.The distance of invasion corrosive medium sharp side can be judged whereby, the time that the member reinforcing bar begins to corrode can be inferred simultaneously, to determine the best maintenance process time apart from the member reinforcing bar.
The present invention can be by arranging detecting sensor respectively at the different parts of structure (as the profundal zone of bridge post, spatter Lang Qu, dry section), arrange a plurality of points simultaneously in each zone, and, can determine to cause the chlorion critical concentration sharp side degree of depth (suitable equally) of reinforcement corrosion exactly to the carbonization sharp side by regularly sensor being carried out data acquisition.Its accuracy comprises double implication: one for the chlorine ion concentration on dangerous sharp side is criticality chlorine ion concentration under concrete testing environment really, two for the determination methods to the dangerous sharp side invasion of the corrosive substance degree of depth be accurately, feasible.Since the present invention be directly at corrosion take place carrier---reinforcing bar is measured, measure to as if bury reinforcing bar (on-site sampling obtains) in advance as for the inside concrete different depth, by specific detection means, etch state to tested reinforcing bar is judged, closely obtain the degree of depth on dangerous sharp side, this method can guarantee the first heavy implication of accuracy.And,, can judge the degree of depth on dangerous sharp side exactly by the rebar surface depth of burying that begins to corrode because the depth of burying of tested reinforcing bar is fixing in advance when deposit concrete.Therefore this method also can guarantee the second heavy implication of accuracy.
Detecting sensor of the present invention is simple in structure, easy to process, the reinforcing bar that adopts is gathered materials on the spot, or choose and the identical reinforcing bar of the used reinforcing bar material of engineering, test environment and actual components environmental facies with, that macro cell corrosion between bar reinforcement and the stainless steel bar is measured is simple and directly perceived, accurately, is easy to judge the etch state of reinforcing bar, can under the prerequisite of not damaging concrete surface, determine the distance of corrosive medium invasion sharp side accurately and easily apart from the member reinforcing bar.
Description of drawings:
Fig. 1 is a sensor construction synoptic diagram of the present invention.
Among Fig. 1,1 is pedestal, and 2 is through wires hole, and 3 is pickup groove, and 4 is bar reinforcement, and 5 is stainless steel bar, and 6 is lead.
Fig. 2 is the sensor perspective view.
Among Fig. 2,1 is pedestal, and 4 is bar reinforcement, and 5 is stainless steel bar, and 6 is lead.
Fig. 3 is reinforcing bar (or stainless steel) rod processing synoptic diagram.
Among Fig. 3,4 is bar reinforcement, and 5 is stainless steel bar, and 6 is lead, and 10 is adhesive tape, and 11 is heat-shrink tube, and 12 is epoxy resin.
Fig. 4 is the test philosophy synoptic diagram.
1 is pedestal among the figure, and 2 is through wires hole, and 3 is pickup groove, and 4 is bar reinforcement, and 5 is stainless steel bar, and 6 is lead, and 7 is reinforcing bar, and 8 is concrete, and 9 are corrosive medium invasion sharp side.
Embodiment:
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
The sensor construction that the present invention adopts as shown in Figure 1 and Figure 2.
Choose and the identical reinforcing bar of the used reinforcing bar material of engineering, become the bar reinforcement 4 of a certain diameter, the length of bar reinforcement 4 to be arithmetic series with machined into and arrange (as 50,45,40,35,30,25,20,15,10,5mm).Make stainless steel bar 5 simultaneously with bar reinforcement 4 same diameter, equal length.An end face welding lead 6 to every bar reinforcement 4 and stainless steel bar 5, and as shown in Figure 3, this wire connecting ends face and side are put heat-shrink tube 11, blended rubber band 10 and epoxy resin 12 carry out encapsulation process, with epoxy resin 12 above bar reinforcement 4 and stainless steel bar 5 are fixed in the pickup groove 3 of pedestal 1 then.Attention: stiff end is the end face that has welded lead 6, and lead 6 is drawn from through wires hole 2.Same diameter, the bar reinforcement 4 and the stainless steel bar 5 of equal length are arranged side by side, and all are the arithmetic series series arrangement, see Fig. 1 and Fig. 2.
The material of pedestal 1 is engineering plastics, and thickness is 10mm, and it is more bigger than bar reinforcement 4 or stainless steel bar 5 to have several diameters on the pedestal 1, dark is the pickup groove 3 of 5mm, pickup groove 3 minutes two rows distribute, and the emptying spacing is 30mm, and the clear spacing between every row's pickup groove 3 is 30mm.The through wires hole 2 that it is 3mm that there is a diameter in each pickup groove 3 central authorities.
According to the order from growing to lacking, bar reinforcement 4 and stainless steel bar 5 are inserted in the pickup groove 3 of pedestal side by side, form stepped.An end that inserts pickup groove 3 is a wire connecting ends, and lead 6 is derived from the through wires hole 2 of pickup groove 3 central authorities.Injection ring epoxy resins 12 sealings in through wires hole 2.
After the lead 6 that connects different length bar reinforcement 4 and stainless steel bar 5 was numbered, steel reinforcement corrosion sensor was made and is finished.
Sensor installation site and test philosophy are as shown in Figure 4.In work progress, after the reinforcing bar in the concrete component 7 tied up Handspan finishing, the pedestal 1 usefulness iron wire of sensor is fixed on the reinforcing bar 7 in the member, notes to contact between iron wire and bar reinforcement 4, the stainless steel bar 5, can not contact between bar reinforcement 4, stainless steel bar 5 and the member reinforcing bar 7.In fixing process, should guarantee that the exposed surface of bar reinforcement 4 and stainless steel bar 5 is parallel with the concrete eight surface, and for the longest bar reinforcement 4 or stainless steel bar 5, its exposed surface to the distance on concrete eight surface is controlled to be 5mm.Record detects position structure reinforcing bars 7 to the distance between the template inside surface (being concrete surface) simultaneously.
Deposit concrete after the maintenance form removal, should be put lead in order, and with polybag lead be wrapped.
Detecting instrument is the current potential electric current instrument of buying on the market, during measurement two electrodes of current potential electric current instrument are connected respectively to the bar reinforcement 4 and the stainless steel bar 5 of be arranged side by side (equal height) by lead 6, measure content and be macro cell corrosion electric current and potential difference (PD) between bar reinforcement 4 and the stainless steel bar 5.According to the bimetallic corrosion principle, when reinforcing bar was in passive state, the potential difference (PD) between bar reinforcement 4 and the stainless steel bar 5 was very little, and Dui Ying grand electric current is also very little with it.As this situation appears, illustrate that dangerous sharp side does not reach the tested end face degree of depth (Fig. 4) of tested reinforcing bar (or stainless steel).Otherwise, if find that unexpected increase has taken place for macro cell corrosion electric current and potential difference (PD) when measuring once more after a while, illustrating that then this rebar surface has been subjected to the influence on dangerous sharp side, this test reinforcing bar case depth has been developed on dangerous sharp side.
Sensor is carried out periodic monitoring, can find As time goes on, the rebar surface quantity that is subjected to the influence of dangerous sharp side increases gradually, and the degree of depth is deepened gradually.
Can deduct the dangerous sharp side development degree of depth with the protective layer thickness of member reinforcing bar 7; obtain the distance of dangerous sharp side apart from member reinforcing bar 7 surfaces; and judge that dangerous sharp side approaches the speed of member reinforcing bar; closely formulate rational maintenance game; before member reinforcing bar 7 does not begin corrosion, in time take methods such as cathodic protection, electrochemical dechlorination to prevent that the member reinforcing bar from beginning corrosion.
The present invention can be by arranging above detecting device respectively at the different parts of structure (as the profundal zone of bridge post, spatter Lang Qu, dry section), and arrange a plurality of points simultaneously in each zone, and buildings is effectively guarded.
Claims (1)
1, the detection method of reinforcement corrosion in a kind of reinforced concrete member, it is characterized in that comprising: 1) choose the bar reinforcement (4) identical with the used reinforcing bar material of engineering, with bar reinforcement (4) same diameter, the stainless steel bar of equal length (5), according to the order from growing to lacking, bar reinforcement (4) is become with stainless steel bar (5) in the stepped pickup groove (3) that is inserted in sensor base (1) side by side, lead (6) is drawn and is numbered from the through wires hole (2) at pickup groove (3) center, to every bar reinforcement (4) and stainless steel bar (5) and lead (6) be connected end face and encapsulation process is carried out in the side, make sensor; 2) before the deposit concrete, the pedestal (1) of sensor is fixed on the reinforcing bar (7) in the concrete component, and the exposed surface that guarantees bar reinforcement (4) and stainless steel bar (5) is parallel with concrete (8) surface, and guarantee that the longest bar reinforcement or stainless steel bar workplace is not more than 5mm apart from concrete surface; 3) two electrodes with current potential electric current instrument are connected respectively to bar reinforcement (4) and the stainless steel bar (5) that is arranged side by side by lead (6), measure macro cell corrosion electric current and potential difference (PD) between bar reinforcement (4) and the stainless steel bar (5), sensor is carried out periodic monitoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031159036A CN1177213C (en) | 2003-03-20 | 2003-03-20 | Method for detecting corrosion of concrete bar in reinforced concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031159036A CN1177213C (en) | 2003-03-20 | 2003-03-20 | Method for detecting corrosion of concrete bar in reinforced concrete |
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| Publication Number | Publication Date |
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| CN1438478A true CN1438478A (en) | 2003-08-27 |
| CN1177213C CN1177213C (en) | 2004-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031159036A Expired - Fee Related CN1177213C (en) | 2003-03-20 | 2003-03-20 | Method for detecting corrosion of concrete bar in reinforced concrete |
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| CN100454000C (en) * | 2006-10-12 | 2009-01-21 | 上海交通大学 | Long term monitoring sensor for steel bar corrosion in steel concrete member |
| CN101144769B (en) * | 2007-09-29 | 2010-08-18 | 哈尔滨工业大学 | Five electrode steel bar corrosion monitoring sensor and its preparation method |
| CN101122595B (en) * | 2007-09-04 | 2011-06-22 | 中交第四航务工程局有限公司 | Concrete structure residual life analysis system |
| CN101071132B (en) * | 2006-05-11 | 2011-07-13 | 上海市建筑科学研究院有限公司 | Concrete chloride ion permeation property quick rust testing method |
| CN101666721B (en) * | 2009-09-28 | 2011-11-16 | 浙江大学宁波理工学院 | Method for rapidly measuring deactivation removal chloridion threshold of reinforcing steel bar in concrete |
| CN101706408B (en) * | 2009-11-27 | 2011-12-28 | 厦门大学 | Reinforced concrete embedded type corrosion sensor |
| CN101226167B (en) * | 2008-02-19 | 2012-05-16 | 清华大学 | Method for rapidly measuring reinforcing steel tarnishing criticality chlorine ion concentration |
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