CN109358098A - A method of test cement-based material surface chlorine ion concentration - Google Patents
A method of test cement-based material surface chlorine ion concentration Download PDFInfo
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- CN109358098A CN109358098A CN201811589558.2A CN201811589558A CN109358098A CN 109358098 A CN109358098 A CN 109358098A CN 201811589558 A CN201811589558 A CN 201811589558A CN 109358098 A CN109358098 A CN 109358098A
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- test specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/226—Construction of measuring vessels; Electrodes therefor
Abstract
The invention discloses a kind of methods for testing cement-based material surface chlorine ion concentration, two spaced test specimens are made by the mold and baffle of insulation, and internal electrode and external electrode are set on each test specimen, it is solidified to test specimen, remove the baffle being set between two test specimens, so that mold and test specimen form cavity between test specimen, test specimen is obtained after maintenance to regulation age under setting condition, Chloride Solution is added to the cavity of test specimen, using the ac impedance spectroscopy of 4 measurement methods test test specimen of AC impedance, and calculate the thickness of the adsorption layer of surface of test piece, thickness based on adsorption layer, the concentration of chloride ion in you can get it adsorption layer, the concentration is cement-based material surface chlorine ion concentration.The present invention is low in cost, and convenient and efficient, test result is accurate and reliable, conducive to the characteristic evaluation to concrete surface physical adsorption chloride ion, conducive to the measurement of Chloride Ion in Concrete transport coefficient, conducive to the durability for more accurately measuring concrete.
Description
Technical field
The present invention relates to ion penetration resistance of concrete to test field, and in particular to a kind of test cement-based material surface
The method of chlorine ion concentration.
Background technique
The durability of reinforced concrete structure is had a major impact in the content of building field, Chloride Ion in Concrete, chlorine
Ion has that ionic radius is small, penetration capacity is strong, and the characteristics of can be adsorbed more by force by metal surface, it can reduce bar list
The destruction of possibility or acceleration passivating film that face passivating film is formed, promotes local corrosion, especially when chloride ion and hydroxide ion
When concentration proportion is more than limitation, it will cause rebar passivation film to fall off, and then cause the corrosion of reinforcing bar, cause under steel reinforcement bearing capacity
Drop and concrete cracking peel off, therefore measure Chloride Ion in Concrete content for the durability Design of assessment concrete structure
It is estimated with construction and service life most important.
The free chloride ion and chemical bonding chloride ion of inside concrete have corresponding method and are tested, however coagulation
The characteristic of physical adsorption chloride ion there is no easy method to measure due to contacting with the solution containing chloride ion on native surface, should
The measurement of characteristic is conducive to the more accurately assessment to concrete structure durability.For example, the common agent on crack resistance of concrete chloride ion of tradition
Permeability testing method includes RCM method and infusion method.RCM method is a kind of examination based on chloride ion unstable state electromigration inside test specimen
Proved recipe method calculates the diffusivity of chloride ion by the chloride ion penetration depth measured during test.Infusion method, that is, test specimen passes through
The immersion or diffusion of certain time, measures the chloride ion content of its different depth, calculates chloride ion mixed using mathematical model afterwards
Transmission speed in solidifying soil.Above-mentioned method is unable to the surface chloride ion of accurate Characterization physical absorption, and therefore, it is difficult to more acurrate
Measure concrete durability in ground.
Concrete chloride ion in Northern Europe concrete specification NT Build 443 and 492 being widely adopted at present spreads system
The principle of number rapid assay methods are as follows: make the chloride ion outside test specimen to test specimen internal migration, warp using the effect of extra electric field
After a period of time, above-mentioned test specimen is in axial direction cleaved, silver nitrate solution is sprayed on the section newly rived, then according to life
At white silver nitride precipitation measurement chloride permeability depth, Chloride Diffusion Coefficient in Concrete is calculated with this, however
When determining Chloride Ion in Concrete transport coefficient, it is required to determine the surface chlorine ion concentration of physical absorption, i.e. cement-based material
Chlorine ion concentration in surface and solution contact portion solid liquid interface.
In addition, chloride ion and free chloride ion in electric double layer are referred to as " can transmit chloride ion " in cement-based material,
It is considered more accurately measuring concrete durability based on chlorine ion concentration distribution characterization chloride ion transport can be transmitted.Calculating can pass
When defeated chloride diffusion coefficient, it is also desirable to determine surface chlorine ion concentration.
The method for not yet finding effective simplicity of test cement-based material surface chlorine ion concentration at present, therefore, it is necessary to
The deficiency is improved.
Summary of the invention
To overcome deficiencies of the prior art, the present invention, which provides one kind, effectively can easily test cement-based material
The method of surface chlorine ion concentration.The invention is realized by the following technical scheme: a kind of test cement-based material surface chloride ion
The method of concentration makes two spaced test specimens by the mold and baffle of insulation, and on each test specimen in setting
Portion's electrode and external electrode are solidified to the test specimen, the baffle being set between two test specimens are removed, so that the mold
And the test specimen forms cavity between the test specimen, obtains test specimen after maintenance to regulation age under setting condition, to
Chloride Solution is added in the cavity of the test specimen, tests the test specimen using 4 measurement methods of AC impedance
Ac impedance spectroscopy, and calculate the thickness of the adsorption layer of the surface of test piece, based on the thickness of the adsorption layer, you can get it institute
The concentration of chloride ion in adsorption layer is stated, which is cement-based material surface chlorine ion concentration.
Preferably, the test specimen includes multiple, is separately added into difference to the cavity of each test specimen
The Chloride Solution of concentration.
Preferably, the capacitance of the adsorption layer is obtained by Fitting Analysis, is calculated based on the capacitance by capacitor
Formula obtains the thickness of the adsorption layer.
Preferably, the mold is rectangle container-like, and open top.
Preferably, the internal electrode is embedded in the test specimen, and the external electrode is covered in the outer end of the test specimen
On face.
Preferably, the internal electrode includes stud, and the external electrode includes the electrode slice of stainless steel.
Preferably, the surrounding of the mold and bottom are sealed water-proofing treatment.
The present invention is not necessarily to microcosmic and chemical experiment, cuts without to sample, cost is very cheap, and convenient test is fast
Victory, and it is able to maintain that laboratory environment is clean and tidy, and test result is accurate and reliable, conducive to the spy to concrete surface physical adsorption chloride ion
Property assessment, conducive to the measurement of Chloride Ion in Concrete transport coefficient, conducive to the durability for more accurately measuring concrete.
Detailed description of the invention
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Fig. 1 is the overlooking structure diagram that the embodiment of the present invention prepares the sample stage；
Fig. 2 is sectional view along AA in Fig. 1；
Fig. 3 be in Fig. 1 BB to cross-sectional view；
Fig. 4 is the structural schematic diagram of electrode slice in Fig. 1.
Corresponding as follows, the mold 1 of each label, block piece 2, electrode slice 3, stud 4, fixing piece 5 in figure.
Specific embodiment
The present invention is further described With reference to embodiment:
As an example, the method for the present embodiment test cement-based material surface chlorine ion concentration, as shown in Figs 1-4,
The following steps are included:
1) mold 1 of certain size is made of insulation organic glass.Organic glass used in mold 1 is with a thickness of 3.7mm, mould
Have 1 long 95.4mm, width 47.4mm, high 43.7mm, using 1 interface of strength glue bond mold, guarantees that mold 1 is water-tight.
2) a rectangular block piece 2 is placed in 1 middle position of mold, to stop concrete of being formed.In 2 side middle line of block piece
Opening diameter is the fixation hole of 2mm at position,.
3) in the fixation hole that 1 side plate center opening diameter of mold is 2mm, and the fixation hole of the fixation hole and block piece 2
It is corresponding.The electrode hole that opening diameter is 2mm at the position tip inside 22mm in 1 side plate of mold, for insertion into cylindric
Stud 4.
4) block piece 2 is put in 1 middle position of mold, and is inserted into fixing piece 5 at above-mentioned fixation hole, fixing piece 5 runs through
1 side of block piece 2 and mold, to prevent block piece 2 mobile, the fixing piece 5 of the present embodiment is implemented in a manner of steel nail.
5) electrode slice 3 that two stainless steels are preset at 1 inside both ends of mold, two as 4 points of AC impedance tests
A external electrode, electrode slice 3 is with a thickness of 1.0mm.Two studs 4 are inserted into electrode hole respectively, are used as 4 points of AC impedance tests
Two internal electrodes, two studs 4 are in the exposed reserved 10mm in the same side, around seccotine enclosed electrode hole, to prevent leak-stopping
Water.
6) cement-based material is cast between stainless steel electrode piece 3 and block piece 2 to form sample, preferred electrode piece 3 is complete
The outer end face for pasting sample entirely is solidified to sample, after the block piece 2 inside dismounting mold 1, then is put in the lower maintenance of setting condition to rule
Determining age obtains test specimen, and the present embodiment preferably comprises multiple test specimens, puts block piece 2 originally to each test specimen
Position at, i.e., at the cavity that is formed between mold 1 and sample, be separately added into the Chloride Solution of various concentration, and with exchange
The ac impedance spectroscopy of 4 measurement method test samples of impedance is fitted analysis using series connection after two RC parallel circuits,
The capacitance of adsorption layer is obtained, and then the adsorbent layer thickness of test specimen can be obtained based on capacitor calculation formula, between several nanometers
To between more than ten nanometers.
7) be based on adsorbent layer thickness, can calculate chlorine ion concentration in adsorbent layer thickness, i.e., cement-based material surface chlorine from
Sub- concentration.
The method of the present embodiment is not necessarily to microcosmic and chemical experiment, cuts without to sample, and cost is very cheap, surveys
Try convenient and efficient, and it is clean and tidy to be able to maintain laboratory environment.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Illustrative description is carried out to the invention patent above, it is clear that the realization of the invention patent is not by aforesaid way
Limitation, as long as use the invention patent method concept and technical solution carry out various improvement, or it is not improved will this
The conception and technical scheme of patent of invention directly apply to other occasions, are within the scope of the invention.
Claims (7)
1. a kind of method for testing cement-based material surface chlorine ion concentration, which is characterized in that pass through the mold and baffle of insulation
Two spaced test specimens are made, and internal electrode and external electrode are set on each test specimen, are solidified to the test specimen,
The baffle being set between two test specimens is removed, so that the mold and the test specimen form appearance between the test specimen
Chamber, under setting condition maintenance to obtaining test specimen after regulation age, to the cavity of the test specimen be added chlorine from
Sub- solution tests the ac impedance spectroscopy of the test specimen using 4 measurement methods of AC impedance, and calculates the test specimen table
The thickness of the adsorption layer in face, based on the thickness of the adsorption layer, the concentration of chloride ion, the concentration in you can get it the adsorption layer
As cement-based material surface chlorine ion concentration.
2. the method according to claim 1, wherein the test specimen include it is multiple, to each test
The cavity of sample is separately added into the Chloride Solution of various concentration.
3. according to the method described in claim 2, it is characterized in that, obtain the capacitance of the adsorption layer by Fitting Analysis,
The thickness of the adsorption layer is obtained by capacitor calculation formula based on the capacitance.
4. the method according to claim 1, wherein the mold is rectangle container-like, and open top.
5. described outer the method according to claim 1, wherein the internal electrode is embedded in the test specimen
Portion's electrode is covered on the outer end face of the test specimen.
6. according to the method described in claim 5, it is characterized in that, the internal electrode includes stud, the external electrode packet
Include the electrode slice of stainless steel.
7. the method according to claim 1, wherein the surrounding of the mold and bottom are sealed at waterproof
Reason.
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| CN201811589558.2A CN109358098B (en) | 2018-12-25 | 2018-12-25 | Method for testing concentration of chloride ions on surface of cement-based material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595975A (en) * | 2019-04-19 | 2019-12-20 | 华北水利水电大学 | Concrete chloride ion diffusion simulation test device and detection method |
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| CN110595975A (en) * | 2019-04-19 | 2019-12-20 | 华北水利水电大学 | Concrete chloride ion diffusion simulation test device and detection method |
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