CN101285821A - Method for distinguishing and determining concrete inside chemically binding or physical adsorption chloride ion - Google Patents
Method for distinguishing and determining concrete inside chemically binding or physical adsorption chloride ion Download PDFInfo
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- CN101285821A CN101285821A CNA2008100478075A CN200810047807A CN101285821A CN 101285821 A CN101285821 A CN 101285821A CN A2008100478075 A CNA2008100478075 A CN A2008100478075A CN 200810047807 A CN200810047807 A CN 200810047807A CN 101285821 A CN101285821 A CN 101285821A
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Abstract
The invention relates to a method capable of distinguishingly determining chemically bonded and physically absorbed chloride ions inside concrete. The method uses an electrical field with a certain field density to compel the chloride ions absorbed on the surface of grains inside a powder material sample to be separated from appendages so as to turn the ions into dissociative chloride ions. By filling NaOH solution into a third portion of powder material, the distinguishing speed of the chemically bonded and physically absorbed chloride ions is quickened by using sodium ions in the solution to substitute the chloride ions in the sample. Accordingly, the purpose for distinguishing the chloride ions in such two states as physical absorption and chemical bond is achieved, and the number of the chloride ions of the powder material sample cured in the form of physical absorption and the number of the chloride ions of the powder material sample cured in the form of chemical bond are distinguishingly determined. The method is simple, easy in operation, capable of effectively distinguishing the chemically bonded and physically absorbed chloride ions inside concrete, and has important significance in research of the capacity of concrete components curing chloride ions and in improvement of concrete resisting chloride salt pollution.
Description
Technical field
The present invention relates to the Materials Science and Engineering field, be specifically related to study the method for cement-based material curing of chloride ion performance.
Background technology
The world today, steel bar corrosion has become the main reason of destroying concrete structure, and causes that the one of the main reasons of concrete reinforcing steel corrosion is exactly that chlorion corrodes.Chlorion in the external environment condition is transferred to the rebar surface of inside concrete in the mode of diffusion or pore absorption, because the chlorion radius is little, penetration power is strong, very easily enters into passivating film and its generation chemical reaction of rebar surface, causes removing blunt of reinforcing steel bar to produce corrosion.Yet there are some researches show, have only the free chloro ion of inside concrete just can constitute harm to reinforcing bar, the chlorion that is solidified by concrete component does not then have harm to reinforcing bar, so the height of concrete component curing of chloride ion ability seems particularly important to preventing steel bar corrosion.
Present main by testing the free and curing two states chlorion quantity variance of inside concrete, as the main foundation of research concrete component to the chlorion ability to cure.Yet chlorion is not single in the cured form of inside concrete, but is present in the inside concrete jointly with physisorption and two kinds of forms of chemical bond.The mode difference of the component curing of chloride ion that inside concrete is different, as the C-S-H gel mainly with physisorption form curing of chloride ion, C
3A is then mainly with chemically combined form curing of chloride ion, the chlorion stability of two kinds of forms is different, the former stability will be inferior to the latter, be subjected to the influence of external environment to be easier to transform once more the chlorion of free state, wish more in the concrete durability design process that obviously concrete component can be more with chemically combined form curing of chloride ion.Therefore only by research free state and cure states chlorion number change difference, can't be accurately the ability of concrete component curing of chloride ion be described, analyzes and judges.In order to study the ability of concrete component curing of chloride ion more accurately, should study respectively the chlorion that solidifies with physisorption and two kinds of forms of chemical bond, yet still there is effective method at present these two kinds of chlorions are not carried out distinguishing assay.
Summary of the invention
Technical matters to be solved by this invention is: but the method for a kind of distinguishing assay inside concrete chemical bond and physical adsorption chloride ion is provided, but the chlorion quantity that chlorion quantity that the physisorption form in this method distinguishing assay powder sample is solidified and the chemically bound form in the powder sample solidify.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
But the method for distinguishing assay inside concrete chemical bond and physical adsorption chloride ion, its concrete steps are:
The first step, the detected concrete sample is made powder, the powder fineness requirement is crossed the 100-150 mesh standard sieve;
Second goes on foot, takes by weighing at least three parts of powder samples identical in quality;
The 3rd step, first part of powder sample adopt the chlorion total quantity C in the ammonium thiocyanate solution titration measuring powder sample
T
Second part of powder sample adopts the free state chlorion quantity C in the liquor argenti nitratis ophthalmicus titration measuring powder sample
F
Add NaOH solution in the 3rd part of powder, the concentration of NaOH solution is 0.1-0.7mol/L, and the addition of NaOH solution is 1-2ml in every 5g powder; The 3rd part of powder inserted in the mould and, continue energising after 12-24 hour, use the free state chlorion quantity C in the liquor argenti nitratis ophthalmicus titration measuring powder sample again to the direct current of powder two ends input 20-40V
F1
The 4th goes on foot, calculates:
Cure states chlorion quantity C in the powder sample
B=C
T-C
F
The chlorion quantity C that physisorption form in the powder sample is solidified
BPFor:
C
BP＝C
F1-C
F
The chlorion quantity C that chemically bound form in the powder sample solidifies
BCFor:
C
BC＝C
B-C
BP。
In the such scheme, described mould is an insulating cylinder body, and the insulating cylinder body two ends are respectively equipped with electrode, imports by electrode to the direct current of powder sample two ends input.
The chlorion that the electric field of the certain field intensity of the inventive method utilization forces powder sample inside to be adsorbed on particle surface breaks away from attached body, be transformed into the free state chlorion, by in the 3rd part of powder, adding NaOH solution, utilize the chlorion in the sodion displacement sample in its solution, thereby accelerate chemical bonding and physical adsorption chloride ion and distinguish speed, reach the purpose of distinguishing physisorption and chemical bonding two states chlorion, the chlorion quantity that chlorion quantity that the physisorption form in the distinguishing assay powder sample is solidified and the chemically bound form in the powder sample solidify.
The inventive method is simple, easily with operation, can distinguish the chlorion of inside concrete chemical bonding and physisorption effectively, to research concrete component curing of chloride ion ability, improving the anti-villaumite pollution of concrete has very important meaning.
Description of drawings
Fig. 1 is the structural representation of the isolated plant of the inventive method use.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
But the method embodiment 1 of the present invention's distinguishing assay inside concrete chemical bond and physical adsorption chloride ion, its concrete steps are:
The first step, the detected concrete sample is made powder, the powder fineness requirement is crossed the 100-150 mesh standard sieve;
Being prepared as of described detected concrete sample: be mixed with detected concrete sample (seeing Table 1) with cement, NaCl, water, and maintenance 28 days, wherein cement is 42.5 grades of Portland cements, and NaCl is pure for analyzing, and water is deionized water.
Second goes on foot, takes by weighing three parts of powder samples identical in quality; The powder sample mass is 5.000 ± 0.005g.
The 3rd step, first part of powder sample adopt the chlorion total quantity C in the ammonium thiocyanate solution titration measuring powder sample
TConcrete grammar is referring to the ammonium thiocyanate solution titrimetry in " marine traffic engineering concrete test rules " (JTJ 270-98).
Second part of powder sample adopts the free state chlorion quantity C in the liquor argenti nitratis ophthalmicus titration measuring powder sample
FConcrete grammar is referring to the liquor argenti nitratis ophthalmicus titrimetry in " marine traffic engineering concrete test rules " (JTJ 270-98).
Add NaOH solution in the 3rd part of powder, the concentration of NaOH solution is 0.5mol/L, and the addition of NaOH solution is 1-2ml; The 3rd part of powder inserted in the mould and, continue energising after 12 hours, use the free state chlorion quantity C in the liquor argenti nitratis ophthalmicus titration measuring powder sample again to the direct current of powder two ends input 30V
F1
As shown in Figure 1, mould 1 is an insulating cylinder body, and the insulating cylinder body two ends are respectively equipped with electrode 2, by the direct current of electrode 2 to powder sample 3 two ends input 30V, continue energising after 12 hours, use the free state chlorion quantity C in the liquor argenti nitratis ophthalmicus titration measuring powder sample again
F1
The 4th goes on foot, calculates:
Cure states chlorion quantity C in the powder sample
B=C
T-C
F
The chlorion quantity C that physisorption form in the powder sample is solidified
BPFor:
C
BP＝C
F1-C
F
The chlorion quantity C that chemically bound form in the powder sample solidifies
BCFor:
C
BC＝C
B-C
BP。
Table 1:
But the method embodiment 2 of the present invention's distinguishing assay inside concrete chemical bond and physical adsorption chloride ion, its concrete steps are basic identical with embodiment 1, and difference only is:
In second step, take by weighing nine parts of powder samples identical in quality, the powder sample mass is 5.000 ± 0.005g.
In the 3rd step, each test is done respectively three times with nine parts of powder samples, measures the chlorion total quantity C in the powder sample
T, free state chlorion quantity C
F, free state chlorion quantity C
F1All use three times average.
But the method embodiment 3 of the present invention's distinguishing assay inside concrete chemical bond and physical adsorption chloride ion, its concrete steps are basic identical with embodiment 2, and difference only is:
Being prepared as of the detected concrete sample that uses in the first step: be mixed with detected concrete sample (seeing Table 2) with cement, mineral admixture, NaCl, water, and maintenance 28 days, wherein mineral admixture is a second class powered coal ash.
In the 3rd step, the NaOH solution concentration of adding is 0.1mol/L; Voltage to powder two ends input dc power is 40V, continues energising 24 hours.
Table 2:
But the method embodiment 4 of the present invention's distinguishing assay inside concrete chemical bond and physical adsorption chloride ion, its concrete steps are basic identical with embodiment 2, and difference only is:
Being prepared as of the detected concrete sample that uses in the first step: be mixed with detected concrete sample (seeing Table 3) with cement, mineral admixture, NaCl, water, and maintenance 28 days, wherein mineral admixture is a slag micropowder.
In the 3rd step, the NaOH solution concentration of adding is 0.7mol/L, is 20V to the voltage of powder two ends input dc power, continues energising 20 hours.
Table 3:
Claims (2)
- But the method for 1 distinguishing assay inside concrete chemical bond and physical adsorption chloride ion, its concrete steps are:The first step, the detected concrete sample is made powder, the powder fineness requirement is crossed the 100-150 mesh standard sieve;Second goes on foot, takes by weighing at least three parts of powder samples identical in quality;The 3rd step, first part of powder sample adopt the chlorion total quantity C in the ammonium thiocyanate solution titration measuring powder sample TSecond part of powder sample adopts the free state chlorion quantity C in the liquor argenti nitratis ophthalmicus titration measuring powder sample FAdd NaOH solution in the 3rd part of powder, the concentration of NaOH solution is 0.1-0.7mol/L, and the addition of NaOH solution is 1-2ml in every 5g powder; The 3rd part of powder inserted in the mould and, continue energising after 12-24 hour, use the free state chlorion quantity C in the liquor argenti nitratis ophthalmicus titration measuring powder sample again to the direct current of powder two ends input 20-40V F1The 4th goes on foot, calculates:Cure states chlorion quantity C in the powder sample B=C T-C FThe chlorion quantity C that physisorption form in the powder sample is solidified BPFor:C BP＝C F1-C FThe chlorion quantity C that chemically bound form in the powder sample solidifies BCFor:C BC＝C B-C BP。
- 2, the method for claim 1 is characterized in that: described mould is an insulating cylinder body, and the insulating cylinder body two ends are respectively equipped with electrode, imports by electrode to the direct current of powder sample two ends input.
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| CN2008100478075A CN101285821B (en) | 2008-05-22 | 2008-05-22 | Method for distinguishing and determining concrete inside chemically binding or physical adsorption chloride ion |
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| CN2008100478075A CN101285821B (en) | 2008-05-22 | 2008-05-22 | Method for distinguishing and determining concrete inside chemically binding or physical adsorption chloride ion |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590059A (en) * | 2012-01-13 | 2012-07-18 | 深圳大学 | Method for determining penetration depth of iodide ions in concrete |
| CN108827989A (en) * | 2018-06-29 | 2018-11-16 | 山东大学 | A kind of method that C-S-H gel adsorption combination chloride ion accounts for total binding chloride ion ratio in measurement cement paste |
| CN110133175A (en) * | 2019-05-07 | 2019-08-16 | 山东大学 | The method of chloride ion content is combined under a kind of accurate Characterization difference carbonizing degree in cement slurry |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071132B (en) * | 2006-05-11 | 2011-07-13 | 上海市建筑科学研究院有限公司 | Concrete chloride ion permeation property quick rust testing method |
| CN200944097Y (en) * | 2006-06-08 | 2007-09-05 | 宁波工程学院 | Rapid determination instrument for concrete chloride ion diffusion coefficient |
-
2008
- 2008-05-22 CN CN2008100478075A patent/CN101285821B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590059A (en) * | 2012-01-13 | 2012-07-18 | 深圳大学 | Method for determining penetration depth of iodide ions in concrete |
| CN108827989A (en) * | 2018-06-29 | 2018-11-16 | 山东大学 | A kind of method that C-S-H gel adsorption combination chloride ion accounts for total binding chloride ion ratio in measurement cement paste |
| WO2020000757A1 (en) * | 2018-06-29 | 2020-01-02 | 山东大学 | Method for measuring ratio of c-s-h gel adsorption combined chloride ion to total combined chloride ion in cement paste |
| CN110133175A (en) * | 2019-05-07 | 2019-08-16 | 山东大学 | The method of chloride ion content is combined under a kind of accurate Characterization difference carbonizing degree in cement slurry |
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| CN101285821B (en) | 2011-06-08 |
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