CN209945971U - Device for evaluating durability of in-service reinforced concrete structure in situ - Google Patents
Device for evaluating durability of in-service reinforced concrete structure in situ Download PDFInfo
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- CN209945971U CN209945971U CN201920483985.6U CN201920483985U CN209945971U CN 209945971 U CN209945971 U CN 209945971U CN 201920483985 U CN201920483985 U CN 201920483985U CN 209945971 U CN209945971 U CN 209945971U
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 38
- 238000011065 in-situ storage Methods 0.000 title claims description 9
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000005253 cladding Methods 0.000 claims abstract description 5
- 239000003292 glue Substances 0.000 claims abstract description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000011156 evaluation Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 3
- 230000007774 longterm Effects 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract description 2
- 230000001174 ascending effect Effects 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 21
- 238000005260 corrosion Methods 0.000 description 21
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 12
- 238000012544 monitoring process Methods 0.000 description 11
- 239000004567 concrete Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 7
- 229910021607 Silver chloride Inorganic materials 0.000 description 6
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 150000001804 chlorine Chemical class 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model provides a device of normal position aassessment at labour reinforced concrete structure durability, it includes a cylindricality casing of being made by plastic deformable material, an inflation plug, a reference electrode and a plurality of working electrode with the same material of structural reinforcement, the outside cladding of working electrode has the insulating rubber circle, the cylindricality casing has the ascending open-ended back taper that is used for screw in inflation plug and glues the consent, can settle the bar recess of reference electrode, a plurality of working electrode holes that are located same vertical face and mutually independent, the blind end of bar recess and the blind end in working electrode hole have been seted up the wire guide and have been used for drawing reference electrode line and working electrode line respectively, reference electrode line and working electrode line circuit connection are to sensor circuit. The utility model has the characteristics of miniaturization, simple installation, long-term effect, economy, applicability and the like.
Description
Technical Field
The utility model relates to a reinforced concrete structure thing corrodes and protection technical field, in particular to device that in labour reinforced concrete structure durability appraises and the prediction of residual life under to chlorine salt corrosion conditions.
Background
Reinforced concrete structures benefit from the advantages of firm materials and simple construction, and are widely applied to various infrastructures such as roads, bridges, wharfs, tunnels and the like. However, the reinforced concrete structure is exposed to various severe corrosion environments, particularly, the reinforced concrete facilities under the chloride corrosion condition are in the severe corrosion environments, chloride ions in the environment invade to cause the corrosion of the steel bars, and then the concrete cracks, so that the long-term service performance of the structure is deteriorated, and the safety and the usability of the structure are obviously reduced. In addition, corrosion also causes a large economic loss. The professor Sitter describes the relationship between the maintenance of the durability of the reinforced concrete structure and the economic loss objectively by adopting the five times law: the wrong reinforcing bar protection that reduces during structural design invests $ 1, and then the required maintenance cost increases $ 5 when the reinforcing bar takes place the corrosion, and required maintenance cost increases $ 25 when concrete surface appears the fracture, and required maintenance cost increases $ 125 when concrete destroys completely. The quintupling law also reflects that if corresponding maintenance measures can be taken in time by monitoring the corrosion condition of the steel bars in the concrete in real time, the maintenance cost can be effectively reduced while the safe operation of the building is kept. Therefore, from the two aspects of safe operation of the structure and reduction of economic loss, the durability of the reinforced concrete structure needs to be effectively monitored in real time and the residual service life of the safety service needs to be accurately evaluated.
The traditional diagnosis method mainly obtains data related to durability and carries out analysis and evaluation through regular sampling detection of an entity structure of an engineering site, but the method has the problems of large workload, long implementation period, low detection efficiency, incapability of realizing real-time monitoring and influence on the safety and the attractiveness of the structure due to micro damage of the sampling detection on the structure. Therefore, the monitoring system which can be buried in the concrete, reasonably, long-term and quickly reflect and predict the corrosion state of the steel bars in the concrete in real time is found, and has important significance for carrying out durability evaluation diagnosis on the structure, predicting when the steel bars are corroded and determining whether the durability is repaired or not so as to effectively prolong the service life of the concrete or ensure that the structure reaches the expected design service life, ensure engineering safety and reduce maintenance cost.
The development of the durability sensor technology provides an important role for guaranteeing the safe use of the reinforced concrete structure. The mature concrete durability monitoring sensor in the market at present mainly comprises an anode ladder, ECI and the like. However, the sensors need to be pre-embedded to function. But not for in-service structures. In order to monitor the durability condition of the in-service reinforced concrete structure, a corresponding after-loading corrosion monitoring system needs to be developed. The expansion ring anode produced by Sensorec of Germany is a first-style after-loading sensor, consists of an anode ring and a cathode bar which are separated, and is installed by adopting an external drilling mode. The expansion ring anode sensor has the defects that a cathode and an anode need to be installed respectively, and a cathode reference electrode needs mortar hole sealing, so that a test result is influenced to a certain extent. The company of Denmark FORCE Technology introduced that the Corrorisk type sensor can also be used for monitoring the durability of the in-service reinforced concrete structure, and the defect is that 8 anodes and a combined electrode are required to form a set, the number of required rotary holes is large, and the appearance of the structure is influenced. The sensors are used for monitoring corrosion potential values of reinforcing steel bar detectors at different depths to reversely deduce chloride ion concentrations around reinforcing steel bars with different depths, and then residual life prediction is carried out through a life prediction model, however, researches show that the chloride ion concentration value causing reinforcing steel bar corrosion is a range and is not an accurate value, and the chloride ion concentration value causing reinforcing steel bar modification of reinforcing steel bars made of different materials is also different, the anode material of the post-mounted sensor is different from the material of the reinforcing steel bar used in a reinforced concrete structure in service, and the corrosion condition of the reinforcing steel bar in the structure can not be truly and accurately reflected, so that residual life pre-storage based on the method is inaccurate and unscientific, and deviation exists in safe use evaluation of the structure. In addition, the long-lasting performance of the sensor is also questioned. The research and development related to the after-loading corrosion monitoring system is still lacking in China.
In the field of prediction of durability life of reinforced concrete structures under chloride corrosion conditions, considerable research has been carried out at home and abroad, for example, a method for predicting durability of structures by using electrode corrosion potentials is introduced in the patent with the publication number of CN106990032A, and corresponding industrial specifications such as Port Hydraulic engineering building detection and technical evaluation Specification (JTJ 302-2006) are provided. However, the residual life prediction performed by the life prediction models is generally based on regular engineering field entity structure sampling detection data, and the analysis and evaluation performed by monitoring the durability data through the sensor is not applied at present, and the reason is that the scientificity, reasonability, long-term effectiveness and the like of the monitoring data of the existing durability sensor are questioned.
China has a large number of structures such as in-service harbor wharfs, cross-sea bridges and river channels under the condition of chlorine salt corrosion, coastal subways, comprehensive pipe galleries, underground spaces and the like, and is one of important contents in the operation and maintenance links in order to guarantee the safe service life of in-service infrastructures and avoid safety accidents, so that the sensor has great demand on the after-loading durability sensor. Therefore, the research on the rear-mounted durability device and the matched residual life prediction method which have high life prediction accuracy, long effect, simple and convenient installation, economy and practicability has great significance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve prior art's not enough, provide one kind can be to chlorine salt corrosion conditions under the back-loading sensing device that the durability of labour reinforced concrete structure appraised and remain life prediction.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an apparatus for in situ assessment of the durability of an in-service reinforced concrete structure, comprising: the utility model provides a cylindricality casing by the deformable material of plasticity makes, an inflation plug, a reference electrode and a plurality of working electrode with the same material of construction reinforcing bar, the outside cladding of working electrode has the insulating rubber circle, the cylindricality casing has the back taper of the opening that makes progress that is used for screw in inflation plug and glues the consent, can settle the bar recess of reference electrode, a plurality of working electrode holes that are located same vertical face and mutually independent, the wire guide has been seted up to the blind end of bar recess and the blind end in working electrode hole and has been used for drawing reference electrode line and working electrode line respectively, reference electrode line and working electrode line circuit are connected to sensor circuit.
Specifically, the working electrode holes are evenly spaced in the vertical direction.
Preferably, the rubber plug hole is located in the center of the cylindrical shell and is a blind hole with an upward opening.
Preferably, the strip-shaped groove is opened at the side surface of the cylindrical shell, and the reference electrode is arranged in the strip-shaped groove and protrudes out of the outer side surface of the cylindrical shell.
Because the durability sensor in the application adopts the steel bar working electrode which is made of the same material as the structural steel bar, the concentration value of the corrosion chloride ions of the steel bar, which is not a determined value and is caused by other similar durability sensors, is not required to be reflected in the residual life prediction formula, and therefore the residual life prediction based on the method is more scientific and accurate. The utility model discloses not only developed the back-loading durability sensor who has characteristics miniaturized, simple installation, long-term, economy are suitable for, proposed a complete set of supporting high accuracy moreover under the condition to the chloride erosion of labour reinforced concrete structure durability aassessment and residual life prediction method.
Description of the drawings:
fig. 1 is a schematic view of the vertical plane structure of the device for evaluating the durability of the in-service reinforced concrete structure in situ.
Fig. 2 is a schematic view of the overlooking structure of the device for evaluating the durability of the in-service reinforced concrete structure in situ according to the present invention.
The device comprises a shell 1, a rubber plug hole 11, a groove 12, a first wire hole 13, a second wire hole 14, an Ag/AgCl reference electrode 2, a reference electrode wire 21, an expansion rubber plug 3, a rubber ring 4, a working electrode 5 and a working electrode wire 51.
The specific implementation mode is as follows:
a device of normal position aassessment at labour reinforced concrete structure durability as shown in figure 1, include cylindrical casing 1, inflation plug 3, Ag AgCl reference electrode 2 and a plurality of and the working electrode 5 of structural reinforcement with the material made by the plastic deformable material, the outside cladding of working electrode 5 has insulating rubber circle 4. The center of the cylindrical shell is provided with an inverted cone-shaped plug hole 13 which is upward in the opening direction and is used for screwing in the expansion rubber plug 3; the side surface of the shell is provided with a strip-shaped groove 12 which is opened outwards and is used for accommodating an Ag/AgCl reference electrode; and the other surface opposite to the groove is provided with a plurality of working electrode holes with outward openings, and the working electrode holes are positioned on the same vertical surface, distributed in a gradient manner and mutually independent and used for arranging working electrodes 5. The blind end of the strip-shaped groove is provided with a second wire hole 14, the blind end of the working electrode hole is provided with a first wire hole 13, the first wire hole and the second wire hole are respectively used for leading out a reference electrode wire 21 and a working electrode wire 51, and the reference electrode wire and the working electrode wire are connected to a sensor circuit through a circuit.
The specific implementation method comprises the following steps:
(1) an apparatus for evaluating the durability of an in-service reinforced concrete structure in situ as shown in figure 1 is assembled.
Preparing a sensor shell: the cylindrical shell is made of polypropylene materials, and the shell is provided with a glue plug hole 11, a groove 12, a first wire hole 13, a second wire hole 14 and a working electrode hole.
The expansion rubber plug adopts a polypropylene expansion rubber plug which is commonly used in the market;
preparing a steel bar working electrode: adopt and use with in the same material reinforcing bar of using in the reinforced concrete structure thing of labour, the diameter of polishing is 8mm, length 5 mm's cylindrical reinforcing bar working electrode, and the copper conductor is connected to one end, and the other end burnishing and polishing, then with thickness 1 mm's rubber circle cladding, the purpose is when guaranteeing reinforced bar working electrode and reinforced concrete structure thing in close contact with prevents the mutual interference between the different reinforcing bar working electrode.
Preparation of reference electrode: an Ag/AgCl electrode prepared by an anode chlorination method is put into an HCl solution with an electroplating solution of 0.1mol/L after being polished, polished and ultrasonically cleaned, and is subjected to anode polarization by adopting an electrochemical workstation, wherein the current density is controlled to be 1mA/cm2The electrifying time is 1 h;
assembling: placing an Ag/AgCl reference electrode in a rectangular groove at one side of the sensor, and leading out a reference electrode lead from a second lead hole; the outer side of the steel bar working electrode is coated with a rubber ring and placed in the working electrode hole, a working electrode lead penetrates out of the first lead hole, and the outer side of the reference electrode protrudes out of the sensor shell so as to be in contact with concrete.
(2) Drilling a hole on the surface of the in-service reinforced concrete structure, wherein the hole diameter is matched with the size of a shell of the device for evaluating the durability of the in-service reinforced concrete structure in situ, plugging the device for evaluating the durability of the in-service reinforced concrete structure in situ with the assembled electrode into the drilled hole, exposing the lead leading-out end, screwing the expansion rubber plug into the rubber plug hole, and enabling the working electrode to be in close contact with the in-service reinforced concrete.
(3) Monitoring the potential between a plurality of working electrodes which are distributed in a vertical gradient manner with the surface of the in-service reinforced concrete structure and an Ag/AgCl reference electrode through a steel bar corrosion potentiometer, and directly judging the penetration condition of chloride ions in the in-service reinforced concrete structure according to the potential of the working electrodes which are close to the distance of steel bars in the in-service reinforced concrete structure.
(4) On the basis of judging the penetration condition of chloride ions in the in-service reinforced concrete structure, the distance between the working electrode which is just corroded and the surface of the protective layer is recorded as drcmThe time from concrete pouring to working electrode rusting is recorded as trcmTaking the thickness of a protective layer in the in-service reinforced concrete structure as d, calculating the residual service life t of the in-service reinforced concrete structure according to the formula (1)rem，
Wherein m is the age decay coefficient of the diffusion coefficient, and the value is calculated by the formula (2):
wherein FA and SG are respectively the mass percentage of the fly ash and the slag powder in the cementing material.
The utility model discloses on the basis of judging chloride ion infiltration situation in the reinforced concrete structure of labour, through combining together reinforced concrete surplus life analytic system under with gradient distribution's among the sensor steel bar electrode current potential and the chlorine salt erosion condition, the prediction is at reinforced concrete structure of labour surplus life. Because the durability sensor adopts the steel bar working electrode made of the same material as the structural steel bar, the concentration value of the corrosion chloride ions of the steel bar, which is not a determined value and is caused by other similar durability sensors, is not required to be reflected in a residual life prediction formula, and therefore, the residual life prediction based on the method is more scientific and accurate.
Claims (4)
1. An apparatus for in-situ evaluation of the durability of an in-service reinforced concrete structure, comprising: the utility model provides a cylindricality casing by the deformable material of plasticity makes, an inflation plug, a reference electrode and a plurality of working electrode with the same material of construction reinforcing bar, the outside cladding of working electrode has the insulating rubber circle, the cylindricality casing has the back taper of the opening that makes progress that is used for screw in inflation plug and glues the consent, can settle the bar recess of reference electrode, a plurality of working electrode holes that are located same vertical face and mutually independent, the wire guide has been seted up to the blind end of bar recess and the blind end in working electrode hole and has been used for drawing reference electrode line and working electrode line respectively, reference electrode line and working electrode line circuit are connected to sensor circuit.
2. The apparatus of claim 1, wherein the apparatus comprises: the working electrode holes are evenly spaced in the vertical direction.
3. The apparatus of claim 1, wherein the apparatus comprises: the glue plug hole is positioned in the center of the cylindrical shell and is a blind hole with an upward opening.
4. The apparatus of claim 1, wherein the apparatus comprises: the strip-shaped groove is opened on the side surface of the cylindrical shell, and the reference electrode is arranged in the strip-shaped groove and protrudes out of the outer side surface of the cylindrical shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920483985.6U CN209945971U (en) | 2019-04-10 | 2019-04-10 | Device for evaluating durability of in-service reinforced concrete structure in situ |
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| CN201920483985.6U CN209945971U (en) | 2019-04-10 | 2019-04-10 | Device for evaluating durability of in-service reinforced concrete structure in situ |
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| CN209945971U true CN209945971U (en) | 2020-01-14 |
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| CN201920483985.6U Withdrawn - After Issue CN209945971U (en) | 2019-04-10 | 2019-04-10 | Device for evaluating durability of in-service reinforced concrete structure in situ |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031390A (en) * | 2019-04-10 | 2019-07-19 | 中交四航工程研究院有限公司 | A kind of device and method of assessment existing R.C. structures durability in situ |
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2019
- 2019-04-10 CN CN201920483985.6U patent/CN209945971U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031390A (en) * | 2019-04-10 | 2019-07-19 | 中交四航工程研究院有限公司 | A kind of device and method of assessment existing R.C. structures durability in situ |
| 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 |
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