CN108645780A - The test method of reinforcing bar accelerating corrosion in a kind of reinforced concrete foundation - Google Patents
The test method of reinforcing bar accelerating corrosion in a kind of reinforced concrete foundation Download PDFInfo
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- CN108645780A CN108645780A CN201810462238.4A CN201810462238A CN108645780A CN 108645780 A CN108645780 A CN 108645780A CN 201810462238 A CN201810462238 A CN 201810462238A CN 108645780 A CN108645780 A CN 108645780A
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- reinforcing bar
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
Abstract
The present invention relates to a kind of test methods of reinforcing bar accelerating corrosion in reinforced concrete foundation, make armored concrete test specimen first, the size of test specimen is 200mm × 150mm × 80mm, and thickness of protection tier is 4~8mm；Experiment bar diameter is 6mm, length 250mm, stainless bar diameter 10mm, length 250mm；After part is made, demoulding standard curing is put into artificial-climate laboratory after 28 days, and sealing wax processing is done to test specimen surrounding, reserves experiment one side and does not do sealing wax processing, and does sealing wax processing to exposing reinforcing bar；Then in artificial-climate laboratory, the measurement of corrosion electric current density is carried out to the experiment reinforcing bar of test specimen, finally test data is handled.The present invention solves the problems, such as that the in test reinforcing bar caused by reinforced concrete foundation thickness of concrete cover is big is difficult to corrosion in a short time, by reducing protective layer thickness, substantially reduces test period, has saved a large amount of man power and material.
Description
Technical field
The present invention relates to a kind of test methods of reinforcing bar accelerating corrosion in reinforced concrete foundation, belong to armored concrete skill
Art field.
Background technology
Basis is one of most important component of building, it undertakes all loads of building, and these loads are transmitted
To ground, therefore basic safety and durability is directly related to safety and the service life of whole building.No matter which kind of is built
Structure type, since its basis will be embedded in the stronger environment of corrosivity, basis all uses reinforced concrete foundation.Steel
As other reinforced concrete members, corrosion can all occur in harsh environment for reinforcing bar on reinforced concrete basis, keep component durable
Property reduce, to influence safety and the service life of component, reinforced concrete foundation is particularly acute.
In the durable Journal of Sex Research of reinforced concrete member, accelerating corrosion is the Common Methods For Research in laboratory.At present
Accelerated corrosion test be all by changing (such as environmental condition：Increase CO2Concentration increases Cl-Concentration changes humiture item
Part, etc.) and reach accelerated corrosion, shorten the purpose of test period.Although these methods can speed up experiment, but cannot be fine
Steel bar corrosion process in simulation actual environment and mechanism, also waste a large amount of energy in experiment.Even if not considering above-mentioned
Defect, using currently used accelerated corrosion test method, it is also difficult to make this thickness of protection tier of reinforced concrete foundation
Bigger component (usually in the case where there is blinding layer, also to there is that 40mm is thick, if in the case of no bed course,
Protective layer thickness will reach 70mm.) in reinforcing bar, corrosion occurs in the short time, is also unable to get the related data of basis corrosion.
Invention content
Present invention aim to address in reinforced concrete foundation present in existing laboratory accelerated corrosion test technology
The slow problem of steel bar corrosion provides a kind of test method of reinforcing bar accelerating corrosion in reinforced concrete foundation.
Technical solution
The present invention is in the reinforcing bar accelerated corrosion test of laboratory, using the special concrete protective for reducing experiment reinforcing bar
The test specimen of layer thickness carries out reinforced concrete foundation reinforcing bar accelerated corrosion test, achievees the purpose that accelerate steel bar corrosion.
Influence steel bar corrosion time started and corrosion rate in reinforced concrete foundation because being known as：Chloride Attack, carbon
Change depth, temperature, humidity, oxygen diffusion, material itself, other factors etc., to factors above application correspondence theorem (including geometry
It is similar, physical phenomenon is similar, single-valued conditions are similar.) if the contracting ratio it is found that change material properties is analyzed respectively, need change
Environment contracting than and humiture contracting than etc., change parameter it is more, reality in be difficult meet, it is also difficult to achieve the purpose that time contracting ratio.
Similarly, the contractings such as temperature, humidity, chlorine ion concentration can not change than being also, therefore to reach rational time contracting ratio, only
Change geometry contracting ratio, and since time contracting changes circulative metabolism than corresponding humiture than caused by for geometry contracting.
When it is assumed that the contracting of this geometric dimension of concrete cover compare for a when, respectively by chlorion, oxygen in concrete
Diffusion equation, concrete carbonization depth equation, Equations of Three-dimension and these physical equations of wetness control equation and boundary
Condition lists similarity transformation formula, and it is 1 to take these parameter contracting ratios such as temperature, humidity, chlorine ion concentration, and arrangement obtains the time
Contracting is than being a2, further according to time contracting ratio, determine the variation circulative metabolism of humiture.The accelerated test is used to test 1 year phase
When in concrete 100 years in the actual environment, to substantially reduce test period, and more accurate data can be obtained.
The present inventor determines that suitable cover to reinforcement is thick according to the grain size situation of coarse-fine aggregate used in concrete sample
Degree.Under normal conditions, when making concrete sample, to ensure that the intensity and density of concrete, aggregate should have
Good grading, it is contemplated that coarse aggregate facilitates acquisition the characteristics of this test method and in reality, and thickness of protection tier is set
It is set to 4~8mm, the cover to reinforcement contracting ratio of reinforced concrete foundation is made to reach 5~10.Respectively by chlorion, oxygen in coagulation
Diffusion equation in soil, concrete carbonization depth equation, Equations of Three-dimension and these physical equations of wetness control equation and
Its respective primary condition and boundary condition can obtain the similar index of various physical changes and similar finger according to correspondence theorem
Then mark formula rule of thumb obtains similarity criterion such as formula (1) with Similarity Transformation method：
In above formula, m is the similarity criterion of thickness of protection tier and various influence factors, and x is thickness of protection tier, t
For action time, DclThe diffusion coefficient for being chlorion in concrete,The diffusion coefficient for being oxygen in concrete, KzFor
The combined influence index of concrete carbonization, k are decided by that the pyroconductivity, density and thermal capacitance of concrete, h are relative humidity.
By (1) formula it is found that when concrete cover to reinforcement contracting is than being 5~10, according to similarity criterion, each influence because
Plain contracting of lower time is 25~100 than all.
The present inventor is according to time contracting ratio, it is determined that the change circulative metabolism of artificial climate room temperature humidity.In view of basis
Actual conditions, the humiture of deep foundation is more constant, be not present the problem, primarily directed to shallow foundation, temperature is with outdoor
Temperature Four seasons change is affected, and humidity is also relatively stablized.Therefore, humidity level is set as 80% relative humidity, temperature
Degree was then according to time contracting ratio, by 21.9~87.6 hours one seasons of simulation.
Concrete scheme is as follows：
The test method of reinforcing bar accelerating corrosion, includes the following steps in a kind of reinforced concrete foundation：
(1) armored concrete test specimen is made：
First, the cuboid concrete sample mold that internal control size is 200mm × 150mm × 80mm, pre-buried experiment are made
Reinforcing bar and stainless reinforcing bar, then casting concrete test specimen, vibration compacting；After test specimen is made, demoulding standard curing is put after 28 days
Enter artificial-climate laboratory, sealing wax processing is done to test specimen surrounding, reserves experiment one side and do not do sealing wax processing, and done to exposing reinforcing bar
Sealing wax processing；
The size of the armored concrete test specimen is 200mm × 150mm × 80mm, and thickness of protection tier is 4~8mm；
Experiment bar diameter is 6mm, length 250mm, stainless bar diameter 10mm, length 250mm；
In the concrete of use, cement：Water：Sand：Stone=1：0.44：1.23：2.49；
(2) measurement of corrosion electric current density is carried out to the experiment reinforcing bar of test specimen：
In artificial-climate laboratory, as soon as often changing time Climatic Effects room temperature, worked using electrochemical analysis system
It stands, the detection of the corrosion electric current density of a reinforcing bar is done using linear polarization method, while utilizing concrete crack width detector
Whether the closer side concrete surface of detection test specimen distance test (DT) reinforcing bar has crack appearance.
It no longer needs to spray concrete sample or be added electrolyte during entire detection experiment.
(3) test data is handled：
Shown in the contracting of practical corrosion electric current density and experiment value formula (2) for example than reduction formula：
I in formulacorrFor practical corrosion electric current density, i' is corrosion electric current density experiment value, KCFor cover to reinforcement contracting ratio；
By (2) formula it is found that the relationship of practical corrosion electric current density and experiment value is reciprocal times of cover to reinforcement contracting ratio, root
According to the actual current density that conversion obtains, the correlation analysis of steel bar corrosion is carried out.
In step (1), to ensure that the corrosion electric current of the test specimen reinforcing bar of protective layer 20mm can be measured more preferably, when test specimen makes,
In the mixture of concrete, the NaCl saturated solutions of cement consumption 5% are added.
In step (1), strength grade of concrete C25, fine aggregate use nature medium sand, coarse aggregate using grain size 5~
The rubble of 10mm.
In step (2), it is 80% that phjytotron, which controls humidity,；One group of test specimen of protective layer 4mm simulates shallow foundation, manually
21.9 hours one seasons of simulation of weather, simulation spring temperature are taken as：15℃；Simulation summer temp is taken as：32℃；Simulate fall temperature
It is taken as：18℃；Simulation winter temperature is taken as：5℃.
Beneficial effects of the present invention：It solves and is being tried caused by reinforced concrete foundation thickness of concrete cover is big
The problem of middle reinforcing bar is difficult to corrosion in a short time is tested, by reducing protective layer thickness, test period is substantially reduced, has saved a large amount of
Man power and material；The experimental method also compensates for single change humiture circulative metabolism accelerated test and does not consider environmental factor
Corrode the defect of path change.
Description of the drawings
Fig. 1 is the profilograph of armored concrete test specimen；
Fig. 2 is the cross-sectional view of armored concrete test specimen；
Wherein, 1- concrete samples；2- tests reinforcing bar；The stainless reinforcing bars of 3-, d- test the protective layer thickness of reinforcing bar.
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
Embodiment
3 groups of test specimens are made, the size of every group of 3 test specimens, test specimen is 200mm × 150mm × 80mm.Battery of tests reinforcing bar
Protect thickness 4mm (test specimen number is 1-1,1-2,1-3), two groups of experiment cover to reinforcement thickness 8mm (test specimen number is 2-1,2-2,
2-3), 3 groups of experiment cover to reinforcement thickness 20mm (test specimen number is 3-1,3-2,3-3).Test specimen raw material are respectively：Cement uses
R32.5 Portland cements；It is 250mm to test reinforcing bar and use HRB335 grades of reinforcing bars, bar diameter 6mm, reinforcing bar length；It is stainless
Bar diameter 10mm, length 250mm；Fine aggregate uses nature medium sand；Coarse aggregate uses the rubble of 5~10mm of grain size；Concrete
Strength grade is C25, concrete mix, cement：Water：Sand：Stone=1：0.44：1.23：2.49.
The specific production method of test specimen is：First with the glued board plank sheathing (wood of 2 pieces of 200mm × 80mm of 5 pieces of 12mm thickness
Plate, the plank of one piece of 200mm × 174mm and 2 piece of 174mm × 92mm) internal control size is made as 200mm × 150mm × 80mm's
Cuboid concrete sample mold, and according to thickness of protection tier and stainless reinforcing bar try position (such as Fig. 1 and 2) in the block with
And the respective diameter of the two, open circular hole on the plank of 2 pieces of 174mm × 92mm；It, first will experiment reinforcing bar and stainless after mold is carried out
Reinforcing bar is penetrated from respective circular hole；Concrete total volume is determined by required making test specimen quantity, and institute is prepared according to match ratio
Need concrete；The concrete prepared is packed into test piece mould, is used in combination bar dowel to be inserted into closely knit.
After test specimen is made, demoulding standard curing is put into artificial-climate laboratory after 28 days, is done at sealing wax to test specimen surrounding
Reason reserves experiment one side and does not do sealing wax processing, and does sealing wax processing to exposing reinforcing bar, prevents corrosion.
It is 80% that phjytotron, which controls humidity,；One group of test specimen of protective layer 4mm simulates shallow foundation, and artificial climate 21.9 is small
When simulate a season, simulation spring temperature be taken as：15 degrees Celsius；Simulation summer temp is taken as：32 degrees Celsius；Simulation fall temperature takes
For：18 degrees Celsius；Simulation winter temperature is taken as：5 degrees Celsius, protective layer 8mm's and 20mm's two groups of test specimens simulate deep foundations, real
Room is tested using 25 degrees Celsius of simulations of constant temperature；To ensure that the corrosion electric current of the test specimen reinforcing bar of protective layer 20mm can be measured more preferably, test specimen
The NaCl solution of cement consumption 5% is added when making；CO2And O2Concentration uses the content in general atmosphere, and laboratory is using frequent
Ventilation ensures CO2And O2Concentration.
The detection for doing a steel bar corrosion rate at regular intervals, is detected using linear polarization method, and detecting instrument is electricity
Chemical analysis system work station (CS3000) detects specific data such as following table
1 each group test specimen steel bar corrosion current density of table
By the above experimental data it is not difficult to find that when protective layer is 4mm and 8mm, although temperature cycles mechanism is different,
In the observation period, the corrosion electric current density of reinforcing bar has been both greater than 1 μ A/cm2, present higher rusting rate.And for protecting
Sheath is the test specimen of 20mm, although increasing Chloride Attack again on the basis of second group of etching condition, reinforcing bar rust
Erosion current density only has 0.2 μ A/cm2, rusting rate is relatively low.Therefore, which has confirmed experiment side of the invention well
The validity of method.
Claims (4)
1. the test method of reinforcing bar accelerating corrosion in a kind of reinforced concrete foundation, which is characterized in that include the following steps：
(1) armored concrete test specimen is made：
First, the cuboid concrete sample mold that internal control size is 200mm × 150mm × 80mm, pre-buried experiment reinforcing bar are made
With stainless reinforcing bar, then casting concrete test specimen, vibration compacting；After test specimen is made, demoulding standard curing is put into people after 28 days
Work climatizer does sealing wax processing to test specimen surrounding, reserves experiment one side and does not do sealing wax processing, and does sealing wax to exposing reinforcing bar
Processing；
The size of the armored concrete test specimen is 200mm × 150mm × 80mm, and thickness of protection tier is 4~8mm；
Experiment bar diameter is 6mm, length 250mm, stainless bar diameter 10mm, length 250mm；
In the concrete of use, cement：Water：Sand：Stone=1：0.44：1.23：2.49；
(2) measurement of corrosion electric current density is carried out to the experiment reinforcing bar of test specimen：
In artificial-climate laboratory, as soon as often changing time Climatic Effects room temperature, electrochemical analysis system work station is utilized, is adopted
The detection of the corrosion electric current density of a reinforcing bar is made of linear polarization method, while utilizing the detection examination of concrete crack width detector
Whether the closer side concrete surface of part distance test (DT) reinforcing bar has crack appearance；
(3) test data is handled.
Shown in the contracting of practical corrosion electric current density and experiment value formula (2) for example than reduction formula：
I in formulacorrFor practical corrosion electric current density, i' is corrosion electric current density experiment value, KCFor cover to reinforcement contracting ratio；
According to the actual current density that conversion obtains, the correlation analysis of steel bar corrosion is carried out.
2. the test method of reinforcing bar accelerating corrosion in reinforced concrete foundation as described in claim 1, which is characterized in that step
(1) in, when test specimen makes, in the mixture of concrete, the NaCl saturated solutions of cement consumption 5% are added.
3. the test method of reinforcing bar accelerating corrosion in reinforced concrete foundation as described in claim 1, which is characterized in that step
(1) in, strength grade of concrete C25, fine aggregate uses nature medium sand, coarse aggregate to use the rubble of 5~10mm of grain size.
4. the test method of reinforcing bar accelerating corrosion, feature exist in the reinforced concrete foundation as described in claims 1 or 2 or 3
In in step (2), it is 80% that phjytotron, which controls humidity,；One group of test specimen of protective layer 4mm simulates shallow foundation, artificial climate
21.9 hour simulates a season, simulation spring temperature is taken as：15℃；Simulation summer temp is taken as：32℃；Simulation fall temperature takes
For：18℃；Simulation winter temperature is taken as：5℃.
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Cited By (3)
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| CN109557017A (en) * | 2018-11-15 | 2019-04-02 | 北京科技大学 | Tropical marine atmospheres Environmental Concrete structural steel muscle corrosion resistance experimental method |
| CN109655398A (en) * | 2019-02-27 | 2019-04-19 | 长安大学 | A kind of device and measurement method for the corrosion of testing conductive concrete steel bridge panel |
| CN111678858A (en) * | 2020-05-09 | 2020-09-18 | 江苏禹治流域管理技术研究院有限公司 | Device and method for monitoring steel bar corrosion based on PPP-BOTDA |
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| CN111678858A (en) * | 2020-05-09 | 2020-09-18 | 江苏禹治流域管理技术研究院有限公司 | Device and method for monitoring steel bar corrosion based on PPP-BOTDA |
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