CN209624235U - A kind of augmentor for studying reinforcing bar degree of corrosion - Google Patents
A kind of augmentor for studying reinforcing bar degree of corrosion Download PDFInfo
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- CN209624235U CN209624235U CN201822116740.8U CN201822116740U CN209624235U CN 209624235 U CN209624235 U CN 209624235U CN 201822116740 U CN201822116740 U CN 201822116740U CN 209624235 U CN209624235 U CN 209624235U
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- 230000007797 corrosion Effects 0.000 title claims abstract description 101
- 238000005260 corrosion Methods 0.000 title claims abstract description 101
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 76
- 239000010959 steel Substances 0.000 claims abstract description 76
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000011160 research Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 10
- 239000002253 acid Substances 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 2
- 238000013139 quantization Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 43
- 230000002787 reinforcement Effects 0.000 description 12
- 239000004567 concrete Substances 0.000 description 9
- 210000003205 muscle Anatomy 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
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- 238000004088 simulation Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003755 preservative agent Substances 0.000 description 3
- 230000002335 preservative effect Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000002180 anti-stress Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000000840 electrochemical analysis Methods 0.000 description 2
- 238000000835 electrochemical detection Methods 0.000 description 2
- 238000002848 electrochemical method Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000004452 microanalysis Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- 238000009659 non-destructive testing Methods 0.000 description 1
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Abstract
The utility model discloses a kind of augmentor for studying reinforcing bar degree of corrosion, including boosting frame, boosting frame includes H profile steel, and the both ends of H profile steel are respectively welded thick steel plate, and thick steel plate is equipped with the through-hole of anchor bar.The specification of thick steel plate: length × width x thickness=200mm × 160mm × 20mm；The specification of H profile steel: h × b × t1 × t2=150mm × 150mm × 7mm × 10mm；Material: Q345.Reinforcing bar carries out sour corrosion under stress condition and measures degree of corrosion while corrosion.It can be with analog study bridge force-bearing steel bar corrosion process；It can be to real bridge steel bar corrosion situation and the progress quick nondestructive quantization detection of instantaneous corrosion rate of being on active service.Mainly for detection of extent of steel corrosion in acid structure and directly determine the corrosion situation of reinforcing bar in acid structure.
Description
Technical field
The utility model relates to it is a kind of study reinforcing bar degree of corrosion technology more particularly to it is a kind of research reinforcing bar degree of corrosion plus
Power device.
Background technique
The existing bridge collapse accident of frequency causes heavy losses to people's life safety and national wealth in recent years, has become
The pain spot of the whole society.To prevent bridge from instantaneously collapsing, there is an urgent need to establish, steel and concrete structure bridge early diagnosis is disconnected, durability that early prevent
Forecast system.
Mechanical properties decrease caused by steel bar corrosion is to induce the key point of bridge major accident.And reinforcing bar locally corrodes
It is the basic reason for causing bridge instantaneous break that the stress concentration and bearing capacity of initiation, which sharply decline, and there is huge safety is hidden
Suffer from.
In the prior art, due to lacking technical basis of the unified technical specification as calibration extent of steel corrosion, it is difficult to
Ensure that measured value is accurate and reliable.
Reinforcing steel bar bear corrosion technology:
The corrosion of reinforcing bar needs three conditions in reinforced concrete member:
(1) rebar surface alkaline passivation film destroys.Reinforcing bar is wrapped around within concrete under normal circumstances, and concrete is then due to cement
Hydration reaction cause its initial alkalinity (containing certain C a (OH)2) relatively strong, reinforcing bar is under this alkaline environment under normal circumstances
Oxidation corrosion will not occur.When pH value is greater than 1O, the speed of reinforcement corrosion is very slow, when pH value is less than 5, the speed of corrosion
It is just fast.It can be seen that alkaline passivation film is carbonized or other reasons are led because of concrete around reinforcing bar only in the reinforced concrete member
It causes after destroying, is likely to corrode.
(2) potential difference must be generated, reinforcing bar is made to generate the corrosion of micro-cell corrosion formula big battery.
(3) must have water and oxygen.
Corrosive media and reinforcing bar act on, after the etch pit that rebar surface forms the Dispersed precipitate that differs in size, often
A etch pit is equivalent to a notch, and reinforcing bar under the action of tensile stress, concentrate, In by the uneven distribution and stress for forming stress
The edge of notch, when reinforcing bar mean stress is not high, the stress concentrated is the level that can reach fracture strength, and causes reinforcing bar
Fracture.Due to the presence of notch, the unequal state of three axis of tensile stress is formd, the development of plastic property of reinforcement rebar deformation is hindered, makes
Plastically deformed performance cannot give full play of before reinforcing bar fracture, and the plasticity index such as elongation percentage, clod wash decreased significantly.In advance
The corrosion of stress reinforcing bar is that tensile stress is coefficient with corrosive media as a result, corrosion factor originally forms reinforcing bar fracture
It plays a major role, and tensile stress then promotes the development of corrosion.Since the stress corrosion in high tensile reinforcement is with deformed bar
There are one of high tensile reinforcement Special Corrosion Types in the use of concrete structure, i.e. " stress corrosion ".Generally on surface
There are slight damage or basic invisible damage.
The sensibility of stress corrosion is improved with the raising of reinforced steel bar strength and stress tension value, so even if the high steel of intensity
Muscle can not be controlled too high using stress.On the contrary, tensile strength suitably reduces, it is significantly improved to anti-stress corrosion performance.
For prestress value, to be designed in conjunction with economy and anti-stress corrosiveness.
Electrochemical test method, it is current that advantage, which is test speed fast, high sensitivity, can be continuously tracked and in-situ test
The test method of comparative maturity.Laboratory be used successfully to concrete sample steel bar corrosion situation and instantaneous corrosion rate
Detection, and produced the test equipment that many engineerings use.Consulting literatures data and equipment Market investigation and analysis are it is found that mesh
It is preceding to corrode the most common electrochemical method of nondestructive quantitative detection field in concrete reinforcement both at home and abroad.
Following table is common electrochemical method comparison.
The shortcomings that prior art:
(1) it only considered the degree of corrosion of reinforcing bar in acid condition under non-stress, without considering actual environment
Lower reinforcing steel bar bear problem.
(2) reinforcement corrosion model constructed is not inconsistent with actual loading steel bar corrosion situation.It is accurately pre- to be difficult to realize durability
It surveys.
Utility model content
The purpose of the utility model is to provide a kind of augmentors for studying reinforcing bar degree of corrosion.
The purpose of this utility model is achieved through the following technical solutions:
The augmentor of the research reinforcing bar degree of corrosion of the utility model, including boosting frame, the boosting frame include H profile steel,
The both ends of the H profile steel are respectively welded thick steel plate, and the thick steel plate is equipped with the through-hole of anchor bar.
The research reinforcing bar provided by the embodiment of the utility model it can be seen from above-mentioned technical solution provided by the utility model
The augmentor of degree of corrosion can determine mainly for detection of extent of steel corrosion in acid structure and directly steel in acid structure
Muscle corrosion situation.By the relationship between further investigated steel bar stress rusting rate and mechanical property, steel bar stress is disclosed each
Mechanical property degradation rule and failure mechanism under kind corrosion situation, may be directly applied to real bridge, to rust of the reinforcing bar under stress
Degree of corrosion is detected, and solving laboratory speeding-up simulation tarnish test results, there are larger differences with corrosion degree under natural environment
Different problem improves the detection accuracy for the treatment of rates steel bar corrosion degree, on this basis, can do to treatment rates remaining life
It accurately predicts relatively out.
Detailed description of the invention
Fig. 1 is the boosting frame model structure in the augmentor of research reinforcing bar degree of corrosion provided by the embodiment of the utility model
Schematic diagram.
Fig. 2 is the cross section structure schematic diagram of H profile steel in the utility model embodiment.
Fig. 3 is the research method workflow schematic diagram of the research reinforcing bar degree of corrosion in the utility model embodiment.
In figure:
1, thick steel plate is welded；2, H profile steel；
Symbol: h- height；
B- width；
T1- web thickness；
The edge of a wing t2- thickness；
Specific embodiment
The utility model embodiment will be described in further detail below.Do not make in the utility model embodiment in detail
The content of description belongs to the prior art well known to professional and technical personnel in the field.
The augmentor of the research reinforcing bar degree of corrosion of the utility model, preferable specific embodiment is:
The augmentor of reinforcing bar degree of corrosion is studied, including boosting frame, the boosting frame include H profile steel, the two of the H profile steel
End is respectively welded thick steel plate, and the thick steel plate is equipped with the through-hole of anchor bar.
Every block of thick steel plate is equipped with the through-hole of 4 anchor bars.
The specification of the thick steel plate: length × width x thickness=200mm × 160mm × 20mm；
The specification of the H profile steel: h × b × t1 × t2=150mm × 150mm × 7mm × 10mm.
The material of the thick steel plate and H profile steel: Q345.
The method of the augmentor realization reinforcement corrosion degree of above-mentioned research reinforcing bar degree of corrosion, reinforcing bar is in stress condition
Lower progress sour corrosion simultaneously measures degree of corrosion while corrosion, comprising steps of
A, the test of each stress level drawing control force determines；
B, boosting frame preservative treatment, stretch-draw anchor tests reinforcing bar on boosting frame, and the test specimen of same degree of rusting is anchored at together
On one frame, tension stress is measured, is unsatisfactory for that drawing again is required to anchor, permanent marks is done to the reinforcing bar of different stress levels；
C, the hole on boosting frame is closed, is put into fast erosion liquid and is corroded, corrosion liquid bath will lid cover closure；
D, corrosion pre-stage test is done using non-stress reinforcing bar, establishes various corrosion measurement method measurement data and reinforcement corrosion
The relation curve of degree；
E, the corrosion condition of test reinforcing bar is measured by certain time interval, records measurement data；
F, reach the reinforcing bar etch-stop that expected corrosion requires, by the test specimen requirement and micro-analysis of Mechanics Performance Testing
Interception test specimen, and reserved verifying degree of corrosion test specimen is respectively cut in test specimen requirement, and mechanical test test specimen should there are the surpluses of appropriateness；
G, test specimen Mechanics Performance Testing and corrosion spool microstructure test and analyze.
The augmentor of the research reinforcing bar degree of corrosion of the utility model according to reinforcement corrosion technical indicator and combines detection skill
Art requirement, design is scientific and reasonable, economic, reinforcement corrosion augmentor easy to operate, and the calibration for providing coincidence loss requirement is used
Standard device etc..It can determine mainly for detection of extent of steel corrosion in acid structure and directly steel bar corrosion in acid structure
Situation.
Specific embodiment:
Concrete-bridge and other structures safety in utilization, durability are seriously affected in view of steel bar corrosion, in steel
Muscle Corrosion mechanism and influence factor, lossless detection method etc. have carried out numerous research, and electrochemistry experiment is concrete steel
Good basis has been established in muscle corrosion ratio quantitative detection and characterization technique development.But due to extent of steel corrosion inside concrete structure
A lot of and considerably complicated by external influence factor, reinforcing bar its mechanical property degradation situation after especially corroding is by inside and outside
Because of the control of composite factor, therefore, it is durable to construct steel bar stress mechanics deterioration law model its bridge based on electrochemical signals
Property prediction model become technical problem.
So the utility model devise it is a kind of study reinforcing bar degree of corrosion augmentor can altitude simulation reinforcing bar in acidity
Environment lower stress, and measure using electrochemical test method the degree of rusting of reinforcing bar.
One, the augmentor composition of reinforcing bar degree of corrosion is studied:
1 test reinforcing bar
(1) considering, which reduces boosting frame, corrodes influence to reinforcing bar pulling force, boosting frame cross section will be opposite it is larger cause plus
Power frame weight is to mobile influence；
(2) existing laboratory available space size influences the size of Accelerated corrosion solution pool；
(3) steel reinforcing bar specimen amount of tension size influences problem (by the determining court of ultra stretching test to the loss of tension after anchoring
Stretching force solves), theoretically elongation 0.5mm/m of the HRB400 reinforcing bar under 100MPa action of pulling stress, elongation are smaller；Just
It is 1~1.5m, (the nominal area A=314.20mm of diameter of phi 22 that step, which drafts steel bar corrosion piece lengths,2, type HRB400.Mechanics
Performance test specimen is to corrosion test specimen cutting interception.
2 boosting frames
As shown in Figure 1 and Figure 2, by comprehensively considering and the exploitativeness of corrosion test, the welding of proposed adoption H profile steel both ends is opened
Hole thick steel plate does boosting frame (boosting frame will do preservative treatment), and boosting frame is tentatively drafted according to mobility and is about the left side 1~1.5m
Right (specific size) reinforces the bolt tension of instrument and device for measuring force proposed adoption Beijing this engineering equipment limited liability company of Haitai
Instrument and device for measuring force.
The a length of 1.2m of boosting frame is tentatively drafted according to mobility, H profile steel uses 150 × 150 × 7 × 10 models
(Q345), both ends welding steel thickness 20mm (planar dimension 200mm × 160mm), it is expected that anchor may be implemented in a boosting frame simultaneously
Gu three or more reinforcing bars.And H profile steel boosting frame is 4 holes, is needed in steel plate two sides welded reinforcement screw thread (120mm).
This product major function: this product be mainly used for experimental configuration teaching, can be simulated in loading frame reinforcing bar by
Power corrodes situation.
Two, research method and step, as shown in Figure 3:
1 research method
(1) steel bar corrosion experimental study:
The reinforcing bar of different stress levels is classified corrosion, i.e., tentatively drafting degree of rusting is 5%, 10%, 15% (or 20%).
The detection method of steel bar corrosion determines, detects the size of signal and the relationship of degree of rusting.Steel is wherein determined first
Why not together, muscle non-corroding and the electrochemical detection signal that faint corrosion has occurred have, and provide a lesser range of signal.So as to
Establish the evaluation method and standard of steel bar corrosion.
(2) steel bar mechanics performance is tested:
Raw steel muscle and tensile stress are 0MPa, and the test specimen of 34MPa, 67MPa, 100MPa, 150MPa, 200MPa, 250MPa are drawn
Test is stretched, has ready conditions and carries out impact ductility test (tension and shearing resistance, the determination of sample dimensions).
Original gauge length with cross section relation is rod piece tensile test specimen in the worldIt tries in principle
Part total length Lt> Lc+4d0≥L0+4.5d0>=190mm takes 220mm. (GB-T 228.1-2010 metal material stretching test the 1st
Part room temperature test method)
(3) microcosmic detection before and after steel bar corrosion:
Under different stress levels and different corrosion degree the variation of rebar surface microstructure from it is different.
2 experimental procedures
(1) test of each stress level drawing control force determines；
(2) boosting frame preservative treatment, stretch-draw anchor tests reinforcing bar on boosting frame, and the test specimen of same degree of rusting is anchored at together
On one frame, tension stress is measured, is unsatisfactory for that drawing again is required to anchor；Permanent marks are done to the reinforcing bar of different stress levels；
(3) hole on boosting frame is closed, is put into fast erosion liquid and is corroded；Notice that corrosion liquid bath will lid cover board envelope
It closes；
(4) corrosion pre-stage test is done using non-stress reinforcing bar, establishes various corrosion measurement method measurement data and reinforcing bar is rotten
The relation curve of degree of corrosion；
(5) by the corrosion condition of certain time interval measurement test reinforcing bar, measurement data is recorded；
(6) reach the reinforcing bar etch-stop that expected corrosion requires, by the test specimen requirement and micro-analysis of Mechanics Performance Testing
Test specimen requirement, be respectively cut interception test specimen, and reserved verifying degree of corrosion test specimen.Mechanical test test specimen should there are more than appropriateness
Amount；
(7) test specimen Mechanics Performance Testing and corrosion spool microstructure test and analyze.
The utility model has the beneficial effects that
(1) the utility model can study bridge force-bearing steel bar corrosion process with Fast simulation.
(2) the utility model can carry out non-destructive testing steel bar stress corrosion situation and instantaneous corrosion rate.
The key problem in technology point of the utility model: it is macro to analyse in depth its section for the electrochemical signals by acquiring steel bar stress
Sight/microstructure and structure, external macroscopic deformation is associated with inherent microstructure.Disclose and illustrate Corrosion Reinforcement in complexity
Mechanical property emergency reaction mechanism under stress state and the bearing capacity sudden failure evolution mechanism because of part corrosion initiation.And
The theoretical calculation model that speeding-up simulation corrosion experiment with the non-steel bar stress in previous experiments room obtains compares.
(1) by the relationship of building electrochemical signals and the degree of rusting of steel bar stress, make testing result closer to real bridge
Actual conditions.Effectively improve the detection accuracy of real bridge steel bar corrosion.
(2) by the relational model between building " electrochemical detection signal-mechanical property ", understanding its mechanical property
On the basis of deterioration law and failure characteristics, the microcosmic crystal structure of bond material is further made real bridge durability and rationally being divided
Grade evaluation and life prediction.
(3) structure composition of boosting frame:
Weld thick steel plate specification: 200mm × 160mm × 20mm；Material: Q345；
H profile steel specification: 150mm × 150mm × 7mm × 10mm；Material: Q345.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art can readily occur in the technical scope that the utility model discloses
Change or replacement, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should
Subject to the scope of protection of the claims.
Claims (3)
1. a kind of augmentor for studying reinforcing bar degree of corrosion, which is characterized in that including boosting frame, the boosting frame includes H profile steel,
The both ends of the H profile steel are respectively welded thick steel plate, and the thick steel plate is equipped with the through-hole of anchor bar；
Every block of thick steel plate is equipped with the through-hole of 4 anchor bars.
2. the augmentor of research reinforcing bar degree of corrosion according to claim 1, it is characterised in that:
The specification of the thick steel plate: length × width x thickness=200mm × 160mm × 20mm；
The specification of the H profile steel: h × b × t1 × t2=150mm × 150mm × 7mm × 10mm.
3. the augmentor of research reinforcing bar degree of corrosion according to claim 2, which is characterized in that the thick steel plate and H-type
The material of steel: Q345.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470566A (en) * | 2018-12-17 | 2019-03-15 | 北京石油化工学院 | A kind of augmentor and research method for studying reinforcing bar degree of corrosion |
| CN111797456A (en) * | 2020-06-30 | 2020-10-20 | 北京石油化工学院 | Prediction method for mechanical property degradation rule of steel bar after rusting |
-
2018
- 2018-12-17 CN CN201822116740.8U patent/CN209624235U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470566A (en) * | 2018-12-17 | 2019-03-15 | 北京石油化工学院 | A kind of augmentor and research method for studying reinforcing bar degree of corrosion |
| CN111797456A (en) * | 2020-06-30 | 2020-10-20 | 北京石油化工学院 | Prediction method for mechanical property degradation rule of steel bar after rusting |
| CN111797456B (en) * | 2020-06-30 | 2023-11-03 | 北京石油化工学院 | Prediction method for mechanical property degradation rule of post-rust steel bar |
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