CN101216412B - Steel reinforcement corrosion sensor and preparation method and its detection method for reinforcement corrosion - Google Patents
Steel reinforcement corrosion sensor and preparation method and its detection method for reinforcement corrosion Download PDFInfo
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- CN101216412B CN101216412B CN2007101441209A CN200710144120A CN101216412B CN 101216412 B CN101216412 B CN 101216412B CN 2007101441209 A CN2007101441209 A CN 2007101441209A CN 200710144120 A CN200710144120 A CN 200710144120A CN 101216412 B CN101216412 B CN 101216412B
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Abstract
The invention provides a steel bar corrosion sensor with simple structure and lower cost, a preparation method thereof, and a steel bar corrosion detection method capable of accurately and nondestructively detecting the distance between a hazardous frontal surface and the steel bar in specific corrosion environment on the premise of not damaging concrete surface. The steel bar corrosion sensor comprises a base body and an extraction wire, wherein the base body has a spiral layered distribution in the vertical direction and is provided with longitudinal openings. The preparation method comprises removing screw thread of a steel bar, and cutting to obtain the base body; drilling holes at different heights on the base body; and connecting the extraction wire with the holes and sealing to obtain the steel bar corrosion sensor. The detection method comprises the following steps of: respectively arranging the sensors at different sections of a concrete component, periodically collecting data of the steel bar corrosion sensors at the different positions by a low-resistance tester within the service period of the concrete component, periodically measuring and recording, and determining the corrosion state of the steel bar to be detected to obtain the environmental corrosion condition of concrete.
Description
Technical field
The present invention relates to a kind of sensor, especially relate to the detection method of a kind of steel reinforcement corrosion sensor and preparation method and reinforcement corrosion thereof.
Background technology
The steel bar in reinforced concrete corrosion is one of major influence factors that influences structure durability.The countermeasure of often taking in the actual engineering is: adopt the effective monitoring means of a cover, before reinforcement corrosion does not begin as yet, predict corrosion environment situation in the concrete early, the prediction corrosion factor arrives the time of reinforcement location, and takes 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.
But most of method is indirect method of testing, and many defectives are all arranged up to now.The result that test obtains according to current methods can not judge the etch state of reinforcing bar exactly.
Publication number provides the detection method of reinforcement corrosion in a kind of reinforced concrete member for the application for a patent for invention of CN1438478, directly to corrosion take place carrier---reinforcing bar is measured in real time, sensor is by the some bar reinforcements that are uneven in length, stainless steel bar with bar reinforcement equal number and length, pedestal and lead are formed, 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.The present invention can be under the prerequisite of not damaging concrete surface, by the detection to the reinforcing bar of imbedding the inside concrete different depth, accurately determines to cause the chlorion critical concentration sharp side degree of depth of reinforcement corrosion.
Publication number provides the instrument of a kind of test and analysis of material decay resistance and corrosion speed for the application for a patent for invention of CN1900691, parameters such as especially a kind of polarization resistance by the measurement corrosion system, Tafel slope realize the device of monitoring corrosion of steel in the concrete, comprise charge pulse polarization module, monitoring probe, sensor, modulator-demodular unit, corrosion monitoring software, GSM communication module, CPU control module and power module; Wherein power module, charge pulse polarization module, CPU control module constitute slave computer, and PC and corrosion monitoring software constitute host computer; Monitoring probe is connected with the electrolytic cell cable socket of slave computer through lead with sensor, and the data output end of slave computer connects data communication port, and data communication can be selected wire communication or wireless communication mode; Monitoring probe and sensor and slave computer are 1-15 group, and structural principle of the present invention is simple, use easy to operately, and Monitoring Data is reliable, and power saving is laborsaving, are widely used in the monitoring corrosion of steel of marine site, underground and buildings occasion.
Publication number is for the application for a patent for invention of CN1945278 provides sensor for monitoring reinforcement corrosion long-term in a kind of reinforced concrete member, can be used for directly to corrosion take place carrier---reinforcing bar is measured in real time.Sensor is made up of electrode bar, pedestal, lead and the sacrificial anode of some equal in length, and electrode bar becomes stepped appearance to be fixed in the pickup groove of sensor base, and lead is connected with the anode and cathode of electrode bar respectively by spring leaf.During construction detecting sensor is imbedded concrete, in the operating period of structure, regularly sensor is carried out data acquisition, after the reinforcing bar in finding certain electrode bar corrodes, reinforcing bar is carried out anti-corrosion protection by cathodic protector.The present invention can be under the prerequisite of not damaging concrete surface, by the detection to the reinforcing bar of imbedding the inside concrete different depth, determines the distance of corrosive medium invasion sharp side apart from the member reinforcing bar accurately and easily.
Publication number belongs to Structural Engineering field and technical field of optical fiber sensing for the application for a patent for invention of CN101042328 provides a kind of monitoring methods for reinforcement corrosion and sensor thereof of long period fiber grating.The present invention utilizes to paste reinforcing bar position and place a long period fiber grating straightly, regularly observes LPG transmitted spectrum by spectrometer and changes, and judges with this whether grating bending has taken place, and infers the degree and the speed of reinforcement corrosion.The present invention is by the LPG transmitted spectrum monitoring to imbedding, can be implemented under the prerequisite of not damaging concrete surface, reinforcement corrosion situation in the reinforced concrete member under any environment is carried out long term monitoring, accurately determine to cause the degree and the speed of reinforcement corrosion, the permanance that is applied to reinforced concrete structure in the Structural Engineering field detects and assessment.
Notification number provides the instrument of a kind of test and analysis of material decay resistance and corrosion speed for the utility model patent of CN200952998, parameters such as especially a kind of polarization resistance by the measurement corrosion system, Tafel slope realize the device of monitoring corrosion of steel in the concrete, comprise charge pulse polarization module, monitoring probe, sensor, modulator-demodular unit, corrosion monitoring software, GSM communication module, CPU control module and power module; Wherein power module, charge pulse polarization module, CPU control module constitute slave computer, and PC and corrosion monitoring software constitute host computer; Monitoring probe is connected with the electrolytic cell cable socket of slave computer through lead with sensor, and the data output end of slave computer connects data communication port, and data communication can be selected wire communication or wireless communication mode; Monitoring probe and sensor and slave computer are 1-15 group, and the utility model structural principle is simple, use easy to operately, and Monitoring Data is reliable, and power saving is laborsaving, are widely used in the monitoring corrosion of steel of marine site, underground and buildings occasion.
Summary of the invention
The objective of the invention is at the deficiency in the existing reinforcement corrosion detection method, a kind of simple in structure, lower-cost steel reinforcement corrosion sensor and preparation method thereof is provided.
Another object of the present invention is to provide a kind of under the prerequisite of not damaging concrete surface, can accurately, nondestructively detect under the concrete corrosion environment dangerous sharp side apart from the detection method of the reinforcement corrosion of the distance of reinforcing bar.
Steel reinforcement corrosion sensor of the present invention is provided with matrix and draws lead, matrix layered distribution and be provided with longitudinal opening in the shape of a spiral on vertical, matrix is provided with the lead fairlead, the lead fairlead with draw lead and be connected.
Matrix cross sections is shapes such as annular, triangular ring, oval ring,
Every layer thickness of matrix is preferably 2mm, and interfloor distance is preferably 2mm, and the vertical extension of matrix is preferably 20～50mm, and the number of plies of matrix is preferably 4～10.Matrix longitudinal opening angle in the vertical can be made as 25 °.
For matrix cross sections is the steel reinforcement corrosion sensor of annular, its xsect overall diameter can be regulated according to reinforcing bar diameter of section size, common engineering uses the reinforcing bar overall diameter mostly in 16～40mm scope, therefore, get consistent being advisable of bar diameter size in sensor base external diameter and the member when selecting the reinforcing bar material for use, interior diameter is than the little 2mm of overall diameter as far as possible.
The preparation method of steel reinforcement corrosion sensor of the present invention may further comprise the steps:
1) bar reinforcement is removed screw thread, again it is carried out otch and make, make the matrix of layer structure;
2) establish the lead fairlead at the differing heights place of matrix;
3) will draw lead and step 2) prepared lead fairlead is connected, encapsulation process again, steel reinforcement corrosion sensor.
Described bar reinforcement is preferably selected for use and the identical bar reinforcement of the used reinforcing bar material of engineering, preferred deformed bar.Draw lead and step 2) being connected of prepared lead fairlead be preferably in that matrix connects end face and weld the side; Described encapsulation process can adopt epoxy sealing to handle.
Described bar reinforcement is preferably selected the reinforcing bar of on-site sampling for use, completes at the scene; Also can adopt with the used reinforcing bar of the same type of construction, complete outside the venue.
The detection method of reinforcement corrosion of the present invention may further comprise the steps:
1) lays steel reinforcement corrosion sensor respectively at the different parts of concrete component (as the profundal zone of bridge post, spatter Lang Qu, dry section), arrange at least 1 point simultaneously in each zone.
2) in the operating period of concrete component, regularly the steel reinforcement corrosion sensor at diverse location place (in the structure mainly the steel reinforcement corrosion sensor of force part) is carried out data acquisition with the low resistance tester, periodic measurement, and carry out record, etch state to tested reinforcing bar is judged, closely obtains concrete environmental corrosion situation.
The steel reinforcement corrosion sensor that the present invention is prepared simple in structure, cost is lower.Owing to needn't take out sample when measuring, also needn't remove corrosion product, under the prerequisite of not damaging concrete surface, can be in process of production directly, the corrosion speed at a certain position of monitoring equipment continuously, can accurately, nondestructively detect under the concrete corrosion environment dangerous sharp side apart from the distance of reinforcing bar, have sensitivity, fast, advantage such as convenient.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.
Fig. 2 is the perspective view of the matrix of the embodiment of the invention.
Fig. 3 is the vertical view of Fig. 2.
The processing synoptic diagram of Fig. 4 embodiment of the invention.
Fig. 5 is the position view of the embodiment of the invention in xoncrete structure.
Fig. 6 is the test philosophy synoptic diagram of the embodiment of the invention.
In Fig. 1～6,1. be concrete; 2. be reinforcing bar; 3. be steel reinforcement corrosion sensor matrix (being the engineering steel muscle is made); 4. for drawing lead; 5. be corrosive medium invasion sharp side; 7. be the low resistance tester.
Embodiment
Referring to Fig. 1～3, steel reinforcement corrosion sensor of the present invention is provided with matrix 3 and draws lead 4 (establish 4 altogether and draw lead 41～44), and matrix cross sections is an annular, matrix 3 layered distribution in the shape of a spiral on vertical.Every layer thickness of matrix 3 is 2mm, and interfloor distance is 2mm, and the vertical extension of matrix is 20～50mm, and the number of plies of matrix is 4～10.Its xsect external diameter can be regulated according to reinforcing bar diameter of section size, common engineering uses the reinforcing bar overall diameter mostly in 16～40mm scope, therefore, get consistent being advisable of bar diameter size in sensor base overall diameter and the member when selecting the reinforcing bar material for use, interior diameter is than the little 2mm of overall diameter as far as possible.Be provided with lead fairlead 31 on matrix 3, the longitudinal opening angle of matrix 3 is 25 °.
Referring to Fig. 4, at first, two grade reinforcing steels and the grade III steel muscle of actual usefulness in the engineering are processed starting material as steel reinforcement corrosion sensor during preparation, reinforcing bar is designed the picture fabrication and processing according to the steel reinforcement corrosion sensor that provides above.When making, screw thread with the reinforcing bar outside removes earlier, making reinforcing bar become overall diameter is 20mm, interior diameter is the cylindrical pipe of 18mm, this cylindrical pipe is cut into steel reinforcement corrosion sensor matrix 3 as shown in Figure 2 again, bores lead fairlead 31 in the position of design in advance at last, after the silicon carbide paper polishing of No.400, use acetone, ethanol and washed with de-ionized water successively, do naturally, and contact with air less as far as possible.Must preserve with bag, to prevent the contacting generation oxidation with oxygen in the air.
Secondly, use the tin wire bond together at steel reinforcement corrosion sensor matrix 3 diverse location places and copper conductor 4 (establish 4 altogether and draw lead 41～44), lead and steel reinforcement corrosion sensor matrix are linked closely as far as possible, prevent owing to link the problems such as contact resistance increase that closely do not cause.
Once more, will connect weldering place, should cover the commissure during sealing, and with the sealing of part lead, preparation become the steel reinforcement corrosion sensor that is embedded in the concrete and is used to test comprehensively with epoxy resin 5 sealings.
At last, the steel reinforcement corrosion sensor of making is deposited in dry place.
Below provide the detection method of reinforcement corrosion.
The present invention be utilize the cross-sectional area of steel reinforcement corrosion sensor sample because of corrosion reduces caused resistance variations.If corrosion is uniformly substantially, changes in resistance is just proportional with the increment of corrosion.Total etching extent after after a while can be calculated from each changes in resistance value, thereby also corrosion rate can be calculated.The concrete practice is accurately to measure the preceding resistance R of steel reinforcement corrosion sensor corrosion
0With the resistance R after the corrosion
t, extrapolate etching extent W according to changes in resistance value Δ R before and after the corrosion by following formula then:
ΔR/R
0＝(R
t-R
0)/R
0＝(W
0-W
t)/W
0 (1)
Can get:
Wherein, Δ R, R
0, S
0, W
0Be respectively the long-pending and original weight of the resistance change of test button, original resistance value, original section, R
t, S
t, W
tBe respectively resistance value, sectional area and the weight of test button a certain minute t in corrosion process.
For matrix cross sections is that the steel reinforcement corrosion sensor (being assumed to be uniform corrosion) of rectangle has:
Wherein, a is the long limit of rectangle, and b is the minor face of rectangle; H is the thickness of hypothesis uniform corrosion, and ρ is a resistivity.
Can derive corrosion depth h by formula (3) is:
In the formula: a is the long limit of rectangle, and b is the minor face of rectangle, and Δ R is increased resistance value before and after the corrosion; R
0Be the resistance value after the corrosion.So just can continue to derive some following parameters according to top formula:
1) minimizing of area of section:
2) corrosion quality:
M
c＝ΔS·ρ
0·L＝[ab-(a-h)(b-h)]·ρ
0·L (6)
ρ herein
0Density for iron.
3) average corrosion rate:
V
c＝M/t＝[ab-(a-h)(b-h)]·ρ
0·L/t (7)
Detection method and process following (referring to Fig. 5 and 6).
1) steel reinforcement corrosion sensor installation in position
In Fig. 5 and 6, each label is 1. concrete; 2. reinforcing bar; 3. steel reinforcement corrosion sensor matrix (being the engineering steel muscle is made); 4. draw lead; 5. corrosive medium is invaded the sharp side; 7. be the low resistance tester.
The present invention can be by arranging steel reinforcement corrosion 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 accurately determine to cause the corrosion environment situation of reinforcement corrosion by regularly sensor being carried out data acquisition.Its accuracy comprises double implication: one for not considering the specifics (i.e. corrosion take place reason) of environmental corrosion factor, two for the determination methods to the dangerous sharp side of the corrosive substance 5 invasion degree of depth be accurately, feasible.Because being the carrier-reinforcing bar that directly takes place at corrosion, the present invention measures, measure to as if the steel reinforcement corrosion sensor matrix 3 that is made with material with reinforcing bar 2 in the concrete 1, by specific detection method, etch state to tested reinforcing bar is judged, closely obtain the environmental corrosion situation of concrete 1, this method can guarantee the first heavy implication of accuracy.And,, can judge the degree of depth on dangerous sharp side 5 exactly by the sensor layer that detection begins to corrode because protective layer thickness is fixing in advance when deposit concrete.Therefore this method also can guarantee the second heavy implication of accuracy.
At concrete component template Zhi Haohou, before the concrete depositing, steel reinforcement corrosion sensor is placed on (being sensor ring center and reinforcing bar axis normal) on the position parallel with the concrete cover cushion block.And the bottom part ring center surface that guarantees sensor and protective seam is surperficial parallel, and the while bottom part ring surface distance concrete surface of steel reinforcement corrosion sensor is not more than 5mm.In casting process, should note protecting steel reinforcement corrosion sensor, steel reinforcement corrosion sensor be damaged by pressure preventing that also can imbed steel reinforcement corrosion sensor to make in the cement mortar becomes the concrete pad type.Make one with quadrat method and be placed on outside the concrete component, to consider Temperature Influence.Deposit concrete after the maintenance form removal, should be put lead in order, and with polybag lead be wrapped.
2) testing process
In the operating period of member, regularly use the steel reinforcement corrosion sensor (steel reinforcement corrosion sensor of main force part in the structure) at 7 pairs of diverse location places of low resistance tester to carry out periodic measurement, and perform record.When reinforcing bar did not suffer erosion influencing of medium, the reinforcement corrosion that diverse location place steel reinforcement corrosion sensor is drawn between the lead 4 did not take place as yet, and resistance variations mainly is subjected to Temperature Influence (can solve by the outer sensor concrete test block); In case resistance variations is very big, illustrate that the reinforcement corrosion between this sensor conductor takes place, and with reference to the resistance variations between other leads, thereby the invasion sharp side 5 of judging the environmental corrosion medium has arrived this position.As time goes on, corrosive medium invasion sharp side 5 can deepen continuously, and being subjected to corroding the number of steel bars that the sensor of influence draws between the lead 4 increases gradually.The sensor layer nearest apart from concrete surface is affected, and sensor layer subsequently also begins to be affected.Referring to Fig. 4, draw the resistance variations maximum between lead 41 and 42, the most permanent.Draw lead 42 and 43 subsequently and also begin bigger variation takes place, the resistance of drawing at last between lead 43 and 44 also changes.Two electrodes of low resistance admeasuring apparatus 7 are linked into different conductor,, can obtain the diverse location place because environmental factor causes the resistance variations figure of sensor corrosion by the resistance measurement between the different conductor.Sensor is carried out that regular detection just can predict because the influence of corrosion environment factor, time that reinforcing bar begins to corrode and extent of corrosion.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.
Claims (6)
1. steel reinforcement corrosion sensor is characterized in that being provided with matrix and draws lead, matrix layered distribution and be provided with longitudinal opening in the shape of a spiral on vertical, matrix is provided with the lead fairlead, the lead fairlead with draw lead and be connected;
Described matrix cross sections is annular, triangular ring or oval ring, and every layer thickness of matrix is 2mm, and interfloor distance is 2mm, and the vertical extension of matrix is 20～50mm, and the number of plies of matrix is 4～10;
Matrix longitudinal opening angle in the vertical is 25 °.
2. steel reinforcement corrosion sensor as claimed in claim 1 is characterized in that described matrix cross sections is that the overall diameter of the steel reinforcement corrosion sensor of annular is 16～40mm, and interior diameter is than the little 2mm of overall diameter.
3. the preparation method of steel reinforcement corrosion sensor as claimed in claim 1 is characterized in that may further comprise the steps:
1) bar reinforcement is removed screw thread, again it is carried out otch and make, make the matrix of layer structure;
2) establish the lead fairlead at the differing heights place of matrix;
3) will draw lead and step 2) prepared lead fairlead is connected, encapsulation process again, steel reinforcement corrosion sensor.
4. the preparation method of steel reinforcement corrosion sensor as claimed in claim 3, it is characterized in that described bar reinforcement selects for use and the identical bar reinforcement of the used reinforcing bar material of engineering, draw lead and connect the mode that weld end face and side with adopting being connected of lead fairlead at matrix; Described encapsulation process adopts epoxy sealing to handle.
5. as the preparation method of claim 3 or 4 described steel reinforcement corrosion sensors, it is characterized in that described bar reinforcement selects the reinforcing bar of on-site sampling for use, complete at the scene; Or adopt with the used reinforcing bar of the same type of construction, complete outside the venue.
6. use the detection method of the reinforcement corrosion of steel reinforcement corrosion sensor according to claim 1, it is characterized in that may further comprise the steps:
1) lays steel reinforcement corrosion sensor respectively at the different parts of concrete component, arrange at least 1 point simultaneously in each zone;
2) in the operating period of concrete component, regularly the steel reinforcement corrosion sensor at diverse location place is carried out data acquisition with the low resistance tester, periodic measurement, and perform record, etch state to tested reinforcing bar is judged, and then is obtained concrete environmental corrosion situation.
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| US5472655A (en) * | 1988-11-16 | 1995-12-05 | Fuji Photo Film Co., Ltd. | Method and apparatus for molding magnetic tape cassette |
| US6693445B1 (en) * | 1999-03-08 | 2004-02-17 | John Sutton | Probe device for apparatus for monitoring corrosion of a material |
| CN2755603Y (en) * | 2004-11-13 | 2006-02-01 | 中国海洋大学 | Environment corrosion monitoring probe |
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Patent Citations (3)
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|---|---|---|---|---|
| US5472655A (en) * | 1988-11-16 | 1995-12-05 | Fuji Photo Film Co., Ltd. | Method and apparatus for molding magnetic tape cassette |
| US6693445B1 (en) * | 1999-03-08 | 2004-02-17 | John Sutton | Probe device for apparatus for monitoring corrosion of a material |
| CN2755603Y (en) * | 2004-11-13 | 2006-02-01 | 中国海洋大学 | Environment corrosion monitoring probe |
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